Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb LG |
53 | static DEFINE_MUTEX(regulator_list_mutex); |
54 | static LIST_HEAD(regulator_list); | |
55 | static LIST_HEAD(regulator_map_list); | |
f19b00da | 56 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 57 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 58 | static bool has_full_constraints; |
414c70cb | 59 | |
1130e5b3 | 60 | static struct dentry *debugfs_root; |
1130e5b3 | 61 | |
8dc5390d | 62 | /* |
414c70cb LG |
63 | * struct regulator_map |
64 | * | |
65 | * Used to provide symbolic supply names to devices. | |
66 | */ | |
67 | struct regulator_map { | |
68 | struct list_head list; | |
40f9244f | 69 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 70 | const char *supply; |
a5766f11 | 71 | struct regulator_dev *regulator; |
414c70cb LG |
72 | }; |
73 | ||
f19b00da KM |
74 | /* |
75 | * struct regulator_enable_gpio | |
76 | * | |
77 | * Management for shared enable GPIO pin | |
78 | */ | |
79 | struct regulator_enable_gpio { | |
80 | struct list_head list; | |
778b28b4 | 81 | struct gpio_desc *gpiod; |
f19b00da KM |
82 | u32 enable_count; /* a number of enabled shared GPIO */ |
83 | u32 request_count; /* a number of requested shared GPIO */ | |
84 | unsigned int ena_gpio_invert:1; | |
85 | }; | |
86 | ||
a06ccd9c CK |
87 | /* |
88 | * struct regulator_supply_alias | |
89 | * | |
90 | * Used to map lookups for a supply onto an alternative device. | |
91 | */ | |
92 | struct regulator_supply_alias { | |
93 | struct list_head list; | |
94 | struct device *src_dev; | |
95 | const char *src_supply; | |
96 | struct device *alias_dev; | |
97 | const char *alias_supply; | |
98 | }; | |
99 | ||
414c70cb | 100 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 101 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
102 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
103 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
104 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 105 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 106 | unsigned long event, void *data); |
75790251 MB |
107 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
108 | int min_uV, int max_uV); | |
3801b86a MB |
109 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
110 | struct device *dev, | |
111 | const char *supply_name); | |
414c70cb | 112 | |
1083c393 MB |
113 | static const char *rdev_get_name(struct regulator_dev *rdev) |
114 | { | |
115 | if (rdev->constraints && rdev->constraints->name) | |
116 | return rdev->constraints->name; | |
117 | else if (rdev->desc->name) | |
118 | return rdev->desc->name; | |
119 | else | |
120 | return ""; | |
121 | } | |
122 | ||
87b28417 MB |
123 | static bool have_full_constraints(void) |
124 | { | |
75bc9641 | 125 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
126 | } |
127 | ||
69511a45 RN |
128 | /** |
129 | * of_get_regulator - get a regulator device node based on supply name | |
130 | * @dev: Device pointer for the consumer (of regulator) device | |
131 | * @supply: regulator supply name | |
132 | * | |
133 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 134 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
135 | * returns NULL. |
136 | */ | |
137 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
138 | { | |
139 | struct device_node *regnode = NULL; | |
140 | char prop_name[32]; /* 32 is max size of property name */ | |
141 | ||
142 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
143 | ||
144 | snprintf(prop_name, 32, "%s-supply", supply); | |
145 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
146 | ||
147 | if (!regnode) { | |
16fbcc3b | 148 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
149 | prop_name, dev->of_node->full_name); |
150 | return NULL; | |
151 | } | |
152 | return regnode; | |
153 | } | |
154 | ||
6492bc1b MB |
155 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
156 | { | |
157 | if (!rdev->constraints) | |
158 | return 0; | |
159 | ||
160 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
161 | return 1; | |
162 | else | |
163 | return 0; | |
164 | } | |
165 | ||
414c70cb LG |
166 | /* Platform voltage constraint check */ |
167 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
168 | int *min_uV, int *max_uV) | |
169 | { | |
170 | BUG_ON(*min_uV > *max_uV); | |
171 | ||
172 | if (!rdev->constraints) { | |
5da84fd9 | 173 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
174 | return -ENODEV; |
175 | } | |
176 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 177 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
178 | return -EPERM; |
179 | } | |
180 | ||
181 | if (*max_uV > rdev->constraints->max_uV) | |
182 | *max_uV = rdev->constraints->max_uV; | |
183 | if (*min_uV < rdev->constraints->min_uV) | |
184 | *min_uV = rdev->constraints->min_uV; | |
185 | ||
89f425ed MB |
186 | if (*min_uV > *max_uV) { |
187 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 188 | *min_uV, *max_uV); |
414c70cb | 189 | return -EINVAL; |
89f425ed | 190 | } |
414c70cb LG |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
05fda3b1 TP |
195 | /* Make sure we select a voltage that suits the needs of all |
196 | * regulator consumers | |
197 | */ | |
198 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
199 | int *min_uV, int *max_uV) | |
200 | { | |
201 | struct regulator *regulator; | |
202 | ||
203 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
204 | /* |
205 | * Assume consumers that didn't say anything are OK | |
206 | * with anything in the constraint range. | |
207 | */ | |
208 | if (!regulator->min_uV && !regulator->max_uV) | |
209 | continue; | |
210 | ||
05fda3b1 TP |
211 | if (*max_uV > regulator->max_uV) |
212 | *max_uV = regulator->max_uV; | |
213 | if (*min_uV < regulator->min_uV) | |
214 | *min_uV = regulator->min_uV; | |
215 | } | |
216 | ||
dd8004af | 217 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
218 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
219 | *min_uV, *max_uV); | |
05fda3b1 | 220 | return -EINVAL; |
dd8004af | 221 | } |
05fda3b1 TP |
222 | |
223 | return 0; | |
224 | } | |
225 | ||
414c70cb LG |
226 | /* current constraint check */ |
227 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
228 | int *min_uA, int *max_uA) | |
229 | { | |
230 | BUG_ON(*min_uA > *max_uA); | |
231 | ||
232 | if (!rdev->constraints) { | |
5da84fd9 | 233 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
234 | return -ENODEV; |
235 | } | |
236 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 237 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
238 | return -EPERM; |
239 | } | |
240 | ||
241 | if (*max_uA > rdev->constraints->max_uA) | |
242 | *max_uA = rdev->constraints->max_uA; | |
243 | if (*min_uA < rdev->constraints->min_uA) | |
244 | *min_uA = rdev->constraints->min_uA; | |
245 | ||
89f425ed MB |
246 | if (*min_uA > *max_uA) { |
247 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 248 | *min_uA, *max_uA); |
414c70cb | 249 | return -EINVAL; |
89f425ed | 250 | } |
414c70cb LG |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* operating mode constraint check */ | |
2c608234 | 256 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 257 | { |
2c608234 | 258 | switch (*mode) { |
e573520b DB |
259 | case REGULATOR_MODE_FAST: |
260 | case REGULATOR_MODE_NORMAL: | |
261 | case REGULATOR_MODE_IDLE: | |
262 | case REGULATOR_MODE_STANDBY: | |
263 | break; | |
264 | default: | |
89f425ed | 265 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
266 | return -EINVAL; |
267 | } | |
268 | ||
414c70cb | 269 | if (!rdev->constraints) { |
5da84fd9 | 270 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
271 | return -ENODEV; |
272 | } | |
273 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 274 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
275 | return -EPERM; |
276 | } | |
2c608234 MB |
277 | |
278 | /* The modes are bitmasks, the most power hungry modes having | |
279 | * the lowest values. If the requested mode isn't supported | |
280 | * try higher modes. */ | |
281 | while (*mode) { | |
282 | if (rdev->constraints->valid_modes_mask & *mode) | |
283 | return 0; | |
284 | *mode /= 2; | |
414c70cb | 285 | } |
2c608234 MB |
286 | |
287 | return -EINVAL; | |
414c70cb LG |
288 | } |
289 | ||
290 | /* dynamic regulator mode switching constraint check */ | |
291 | static int regulator_check_drms(struct regulator_dev *rdev) | |
292 | { | |
293 | if (!rdev->constraints) { | |
5da84fd9 | 294 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
295 | return -ENODEV; |
296 | } | |
297 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 298 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
299 | return -EPERM; |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
414c70cb LG |
304 | static ssize_t regulator_uV_show(struct device *dev, |
305 | struct device_attribute *attr, char *buf) | |
306 | { | |
a5766f11 | 307 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
308 | ssize_t ret; |
309 | ||
310 | mutex_lock(&rdev->mutex); | |
311 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
312 | mutex_unlock(&rdev->mutex); | |
313 | ||
314 | return ret; | |
315 | } | |
7ad68e2f | 316 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
317 | |
318 | static ssize_t regulator_uA_show(struct device *dev, | |
319 | struct device_attribute *attr, char *buf) | |
320 | { | |
a5766f11 | 321 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
322 | |
323 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
324 | } | |
7ad68e2f | 325 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 326 | |
587cea27 GKH |
327 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
328 | char *buf) | |
bc558a60 MB |
329 | { |
330 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 331 | |
1083c393 | 332 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 333 | } |
587cea27 | 334 | static DEVICE_ATTR_RO(name); |
bc558a60 | 335 | |
4fca9545 | 336 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 337 | { |
414c70cb LG |
338 | switch (mode) { |
339 | case REGULATOR_MODE_FAST: | |
340 | return sprintf(buf, "fast\n"); | |
341 | case REGULATOR_MODE_NORMAL: | |
342 | return sprintf(buf, "normal\n"); | |
343 | case REGULATOR_MODE_IDLE: | |
344 | return sprintf(buf, "idle\n"); | |
345 | case REGULATOR_MODE_STANDBY: | |
346 | return sprintf(buf, "standby\n"); | |
347 | } | |
348 | return sprintf(buf, "unknown\n"); | |
349 | } | |
350 | ||
4fca9545 DB |
351 | static ssize_t regulator_opmode_show(struct device *dev, |
352 | struct device_attribute *attr, char *buf) | |
414c70cb | 353 | { |
a5766f11 | 354 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 355 | |
4fca9545 DB |
356 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
357 | } | |
7ad68e2f | 358 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
359 | |
360 | static ssize_t regulator_print_state(char *buf, int state) | |
361 | { | |
414c70cb LG |
362 | if (state > 0) |
363 | return sprintf(buf, "enabled\n"); | |
364 | else if (state == 0) | |
365 | return sprintf(buf, "disabled\n"); | |
366 | else | |
367 | return sprintf(buf, "unknown\n"); | |
368 | } | |
369 | ||
4fca9545 DB |
370 | static ssize_t regulator_state_show(struct device *dev, |
371 | struct device_attribute *attr, char *buf) | |
372 | { | |
373 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
374 | ssize_t ret; |
375 | ||
376 | mutex_lock(&rdev->mutex); | |
377 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
378 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 379 | |
9332546f | 380 | return ret; |
4fca9545 | 381 | } |
7ad68e2f | 382 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 383 | |
853116a1 DB |
384 | static ssize_t regulator_status_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
387 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
388 | int status; | |
389 | char *label; | |
390 | ||
391 | status = rdev->desc->ops->get_status(rdev); | |
392 | if (status < 0) | |
393 | return status; | |
394 | ||
395 | switch (status) { | |
396 | case REGULATOR_STATUS_OFF: | |
397 | label = "off"; | |
398 | break; | |
399 | case REGULATOR_STATUS_ON: | |
400 | label = "on"; | |
401 | break; | |
402 | case REGULATOR_STATUS_ERROR: | |
403 | label = "error"; | |
404 | break; | |
405 | case REGULATOR_STATUS_FAST: | |
406 | label = "fast"; | |
407 | break; | |
408 | case REGULATOR_STATUS_NORMAL: | |
409 | label = "normal"; | |
410 | break; | |
411 | case REGULATOR_STATUS_IDLE: | |
412 | label = "idle"; | |
413 | break; | |
414 | case REGULATOR_STATUS_STANDBY: | |
415 | label = "standby"; | |
416 | break; | |
f59c8f9f MB |
417 | case REGULATOR_STATUS_BYPASS: |
418 | label = "bypass"; | |
419 | break; | |
1beaf762 KG |
420 | case REGULATOR_STATUS_UNDEFINED: |
421 | label = "undefined"; | |
422 | break; | |
853116a1 DB |
423 | default: |
424 | return -ERANGE; | |
425 | } | |
426 | ||
427 | return sprintf(buf, "%s\n", label); | |
428 | } | |
429 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
430 | ||
414c70cb LG |
431 | static ssize_t regulator_min_uA_show(struct device *dev, |
432 | struct device_attribute *attr, char *buf) | |
433 | { | |
a5766f11 | 434 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
435 | |
436 | if (!rdev->constraints) | |
437 | return sprintf(buf, "constraint not defined\n"); | |
438 | ||
439 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
440 | } | |
7ad68e2f | 441 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
442 | |
443 | static ssize_t regulator_max_uA_show(struct device *dev, | |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
a5766f11 | 446 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
447 | |
448 | if (!rdev->constraints) | |
449 | return sprintf(buf, "constraint not defined\n"); | |
450 | ||
451 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
452 | } | |
7ad68e2f | 453 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
454 | |
455 | static ssize_t regulator_min_uV_show(struct device *dev, | |
456 | struct device_attribute *attr, char *buf) | |
457 | { | |
a5766f11 | 458 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
459 | |
460 | if (!rdev->constraints) | |
461 | return sprintf(buf, "constraint not defined\n"); | |
462 | ||
463 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
464 | } | |
7ad68e2f | 465 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
466 | |
467 | static ssize_t regulator_max_uV_show(struct device *dev, | |
468 | struct device_attribute *attr, char *buf) | |
469 | { | |
a5766f11 | 470 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
471 | |
472 | if (!rdev->constraints) | |
473 | return sprintf(buf, "constraint not defined\n"); | |
474 | ||
475 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
476 | } | |
7ad68e2f | 477 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
478 | |
479 | static ssize_t regulator_total_uA_show(struct device *dev, | |
480 | struct device_attribute *attr, char *buf) | |
481 | { | |
a5766f11 | 482 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
483 | struct regulator *regulator; |
484 | int uA = 0; | |
485 | ||
486 | mutex_lock(&rdev->mutex); | |
487 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 488 | uA += regulator->uA_load; |
414c70cb LG |
489 | mutex_unlock(&rdev->mutex); |
490 | return sprintf(buf, "%d\n", uA); | |
491 | } | |
7ad68e2f | 492 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 493 | |
587cea27 GKH |
494 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
495 | char *buf) | |
414c70cb | 496 | { |
a5766f11 | 497 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
498 | return sprintf(buf, "%d\n", rdev->use_count); |
499 | } | |
587cea27 | 500 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 501 | |
587cea27 GKH |
502 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
503 | char *buf) | |
414c70cb | 504 | { |
a5766f11 | 505 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
506 | |
507 | switch (rdev->desc->type) { | |
508 | case REGULATOR_VOLTAGE: | |
509 | return sprintf(buf, "voltage\n"); | |
510 | case REGULATOR_CURRENT: | |
511 | return sprintf(buf, "current\n"); | |
512 | } | |
513 | return sprintf(buf, "unknown\n"); | |
514 | } | |
587cea27 | 515 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
516 | |
517 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
518 | struct device_attribute *attr, char *buf) | |
519 | { | |
a5766f11 | 520 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 521 | |
414c70cb LG |
522 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
523 | } | |
7ad68e2f DB |
524 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
525 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
526 | |
527 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
528 | struct device_attribute *attr, char *buf) | |
529 | { | |
a5766f11 | 530 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 531 | |
414c70cb LG |
532 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
533 | } | |
7ad68e2f DB |
534 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
535 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
536 | |
537 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
538 | struct device_attribute *attr, char *buf) | |
539 | { | |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 541 | |
414c70cb LG |
542 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
543 | } | |
7ad68e2f DB |
544 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
545 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 546 | |
414c70cb LG |
547 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
548 | struct device_attribute *attr, char *buf) | |
549 | { | |
a5766f11 | 550 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 551 | |
4fca9545 DB |
552 | return regulator_print_opmode(buf, |
553 | rdev->constraints->state_mem.mode); | |
414c70cb | 554 | } |
7ad68e2f DB |
555 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
556 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
557 | |
558 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
559 | struct device_attribute *attr, char *buf) | |
560 | { | |
a5766f11 | 561 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 562 | |
4fca9545 DB |
563 | return regulator_print_opmode(buf, |
564 | rdev->constraints->state_disk.mode); | |
414c70cb | 565 | } |
7ad68e2f DB |
566 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
567 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
568 | |
569 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
570 | struct device_attribute *attr, char *buf) | |
571 | { | |
a5766f11 | 572 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 573 | |
4fca9545 DB |
574 | return regulator_print_opmode(buf, |
575 | rdev->constraints->state_standby.mode); | |
414c70cb | 576 | } |
7ad68e2f DB |
577 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
578 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
579 | |
580 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
581 | struct device_attribute *attr, char *buf) | |
582 | { | |
a5766f11 | 583 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 584 | |
4fca9545 DB |
585 | return regulator_print_state(buf, |
586 | rdev->constraints->state_mem.enabled); | |
414c70cb | 587 | } |
7ad68e2f DB |
588 | static DEVICE_ATTR(suspend_mem_state, 0444, |
589 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
590 | |
591 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
592 | struct device_attribute *attr, char *buf) | |
593 | { | |
a5766f11 | 594 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 595 | |
4fca9545 DB |
596 | return regulator_print_state(buf, |
597 | rdev->constraints->state_disk.enabled); | |
414c70cb | 598 | } |
7ad68e2f DB |
599 | static DEVICE_ATTR(suspend_disk_state, 0444, |
600 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
601 | |
602 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
603 | struct device_attribute *attr, char *buf) | |
604 | { | |
a5766f11 | 605 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 606 | |
4fca9545 DB |
607 | return regulator_print_state(buf, |
608 | rdev->constraints->state_standby.enabled); | |
414c70cb | 609 | } |
7ad68e2f DB |
610 | static DEVICE_ATTR(suspend_standby_state, 0444, |
611 | regulator_suspend_standby_state_show, NULL); | |
612 | ||
f59c8f9f MB |
613 | static ssize_t regulator_bypass_show(struct device *dev, |
614 | struct device_attribute *attr, char *buf) | |
615 | { | |
616 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
617 | const char *report; | |
618 | bool bypass; | |
619 | int ret; | |
620 | ||
621 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
622 | ||
623 | if (ret != 0) | |
624 | report = "unknown"; | |
625 | else if (bypass) | |
626 | report = "enabled"; | |
627 | else | |
628 | report = "disabled"; | |
629 | ||
630 | return sprintf(buf, "%s\n", report); | |
631 | } | |
632 | static DEVICE_ATTR(bypass, 0444, | |
633 | regulator_bypass_show, NULL); | |
bc558a60 | 634 | |
414c70cb LG |
635 | /* Calculate the new optimum regulator operating mode based on the new total |
636 | * consumer load. All locks held by caller */ | |
8460ef38 | 637 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
638 | { |
639 | struct regulator *sibling; | |
640 | int current_uA = 0, output_uV, input_uV, err; | |
641 | unsigned int mode; | |
642 | ||
8460ef38 BA |
643 | /* |
644 | * first check to see if we can set modes at all, otherwise just | |
645 | * tell the consumer everything is OK. | |
646 | */ | |
414c70cb | 647 | err = regulator_check_drms(rdev); |
8460ef38 BA |
648 | if (err < 0) |
649 | return 0; | |
650 | ||
8f4490e0 BA |
651 | if (!rdev->desc->ops->get_optimum_mode && |
652 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
653 | return 0; |
654 | ||
8f4490e0 BA |
655 | if (!rdev->desc->ops->set_mode && |
656 | !rdev->desc->ops->set_load) | |
8460ef38 | 657 | return -EINVAL; |
414c70cb LG |
658 | |
659 | /* get output voltage */ | |
1bf5a1f8 | 660 | output_uV = _regulator_get_voltage(rdev); |
8460ef38 BA |
661 | if (output_uV <= 0) { |
662 | rdev_err(rdev, "invalid output voltage found\n"); | |
663 | return -EINVAL; | |
664 | } | |
414c70cb LG |
665 | |
666 | /* get input voltage */ | |
1bf5a1f8 MB |
667 | input_uV = 0; |
668 | if (rdev->supply) | |
3f24f5ad | 669 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 670 | if (input_uV <= 0) |
414c70cb | 671 | input_uV = rdev->constraints->input_uV; |
8460ef38 BA |
672 | if (input_uV <= 0) { |
673 | rdev_err(rdev, "invalid input voltage found\n"); | |
674 | return -EINVAL; | |
675 | } | |
414c70cb LG |
676 | |
677 | /* calc total requested load */ | |
678 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 679 | current_uA += sibling->uA_load; |
414c70cb | 680 | |
22a10bca SB |
681 | current_uA += rdev->constraints->system_load; |
682 | ||
8f4490e0 BA |
683 | if (rdev->desc->ops->set_load) { |
684 | /* set the optimum mode for our new total regulator load */ | |
685 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
686 | if (err < 0) | |
687 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
688 | } else { | |
689 | /* now get the optimum mode for our new total regulator load */ | |
690 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
691 | output_uV, current_uA); | |
692 | ||
693 | /* check the new mode is allowed */ | |
694 | err = regulator_mode_constrain(rdev, &mode); | |
695 | if (err < 0) { | |
696 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
697 | current_uA, input_uV, output_uV); | |
698 | return err; | |
699 | } | |
414c70cb | 700 | |
8f4490e0 BA |
701 | err = rdev->desc->ops->set_mode(rdev, mode); |
702 | if (err < 0) | |
703 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
704 | } |
705 | ||
8460ef38 | 706 | return err; |
414c70cb LG |
707 | } |
708 | ||
709 | static int suspend_set_state(struct regulator_dev *rdev, | |
710 | struct regulator_state *rstate) | |
711 | { | |
712 | int ret = 0; | |
638f85c5 MB |
713 | |
714 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
715 | * only warn if the driver implements set_suspend_voltage or |
716 | * set_suspend_mode callback. | |
638f85c5 MB |
717 | */ |
718 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
719 | if (rdev->desc->ops->set_suspend_voltage || |
720 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 721 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
722 | return 0; |
723 | } | |
724 | ||
725 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 726 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
727 | return -EINVAL; |
728 | } | |
414c70cb | 729 | |
8ac0e95d | 730 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 731 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 732 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 733 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
734 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
735 | ret = 0; | |
736 | ||
414c70cb | 737 | if (ret < 0) { |
5da84fd9 | 738 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
739 | return ret; |
740 | } | |
741 | ||
742 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
743 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
744 | if (ret < 0) { | |
5da84fd9 | 745 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
746 | return ret; |
747 | } | |
748 | } | |
749 | ||
750 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
751 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
752 | if (ret < 0) { | |
5da84fd9 | 753 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
754 | return ret; |
755 | } | |
756 | } | |
757 | return ret; | |
758 | } | |
759 | ||
760 | /* locks held by caller */ | |
761 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
762 | { | |
763 | if (!rdev->constraints) | |
764 | return -EINVAL; | |
765 | ||
766 | switch (state) { | |
767 | case PM_SUSPEND_STANDBY: | |
768 | return suspend_set_state(rdev, | |
769 | &rdev->constraints->state_standby); | |
770 | case PM_SUSPEND_MEM: | |
771 | return suspend_set_state(rdev, | |
772 | &rdev->constraints->state_mem); | |
773 | case PM_SUSPEND_MAX: | |
774 | return suspend_set_state(rdev, | |
775 | &rdev->constraints->state_disk); | |
776 | default: | |
777 | return -EINVAL; | |
778 | } | |
779 | } | |
780 | ||
781 | static void print_constraints(struct regulator_dev *rdev) | |
782 | { | |
783 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 784 | char buf[80] = ""; |
8f031b48 MB |
785 | int count = 0; |
786 | int ret; | |
414c70cb | 787 | |
8f031b48 | 788 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 789 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
790 | count += sprintf(buf + count, "%d mV ", |
791 | constraints->min_uV / 1000); | |
414c70cb | 792 | else |
8f031b48 MB |
793 | count += sprintf(buf + count, "%d <--> %d mV ", |
794 | constraints->min_uV / 1000, | |
795 | constraints->max_uV / 1000); | |
796 | } | |
797 | ||
798 | if (!constraints->min_uV || | |
799 | constraints->min_uV != constraints->max_uV) { | |
800 | ret = _regulator_get_voltage(rdev); | |
801 | if (ret > 0) | |
802 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
803 | } | |
804 | ||
bf5892a8 MB |
805 | if (constraints->uV_offset) |
806 | count += sprintf(buf, "%dmV offset ", | |
807 | constraints->uV_offset / 1000); | |
808 | ||
8f031b48 | 809 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 810 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
811 | count += sprintf(buf + count, "%d mA ", |
812 | constraints->min_uA / 1000); | |
414c70cb | 813 | else |
8f031b48 MB |
814 | count += sprintf(buf + count, "%d <--> %d mA ", |
815 | constraints->min_uA / 1000, | |
816 | constraints->max_uA / 1000); | |
817 | } | |
818 | ||
819 | if (!constraints->min_uA || | |
820 | constraints->min_uA != constraints->max_uA) { | |
821 | ret = _regulator_get_current_limit(rdev); | |
822 | if (ret > 0) | |
e4a6376b | 823 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 824 | } |
8f031b48 | 825 | |
414c70cb LG |
826 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
827 | count += sprintf(buf + count, "fast "); | |
828 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
829 | count += sprintf(buf + count, "normal "); | |
830 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
831 | count += sprintf(buf + count, "idle "); | |
832 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
833 | count += sprintf(buf + count, "standby"); | |
834 | ||
215b8b05 UKK |
835 | if (!count) |
836 | sprintf(buf, "no parameters"); | |
837 | ||
194dbaef | 838 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
839 | |
840 | if ((constraints->min_uV != constraints->max_uV) && | |
841 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
842 | rdev_warn(rdev, | |
843 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
844 | } |
845 | ||
e79055d6 | 846 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 847 | struct regulation_constraints *constraints) |
a5766f11 | 848 | { |
272e2315 | 849 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
850 | int ret; |
851 | ||
852 | /* do we need to apply the constraint voltage */ | |
853 | if (rdev->constraints->apply_uV && | |
75790251 | 854 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
064d5cd1 AB |
855 | int current_uV = _regulator_get_voltage(rdev); |
856 | if (current_uV < 0) { | |
69d58839 NM |
857 | rdev_err(rdev, |
858 | "failed to get the current voltage(%d)\n", | |
859 | current_uV); | |
064d5cd1 AB |
860 | return current_uV; |
861 | } | |
862 | if (current_uV < rdev->constraints->min_uV || | |
863 | current_uV > rdev->constraints->max_uV) { | |
864 | ret = _regulator_do_set_voltage( | |
865 | rdev, rdev->constraints->min_uV, | |
866 | rdev->constraints->max_uV); | |
867 | if (ret < 0) { | |
868 | rdev_err(rdev, | |
69d58839 NM |
869 | "failed to apply %duV constraint(%d)\n", |
870 | rdev->constraints->min_uV, ret); | |
064d5cd1 AB |
871 | return ret; |
872 | } | |
75790251 | 873 | } |
af5866c9 | 874 | } |
e06f5b4f | 875 | |
4367cfdc DB |
876 | /* constrain machine-level voltage specs to fit |
877 | * the actual range supported by this regulator. | |
878 | */ | |
879 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
880 | int count = rdev->desc->n_voltages; | |
881 | int i; | |
882 | int min_uV = INT_MAX; | |
883 | int max_uV = INT_MIN; | |
884 | int cmin = constraints->min_uV; | |
885 | int cmax = constraints->max_uV; | |
886 | ||
3e590918 MB |
887 | /* it's safe to autoconfigure fixed-voltage supplies |
888 | and the constraints are used by list_voltage. */ | |
4367cfdc | 889 | if (count == 1 && !cmin) { |
3e590918 | 890 | cmin = 1; |
4367cfdc | 891 | cmax = INT_MAX; |
3e590918 MB |
892 | constraints->min_uV = cmin; |
893 | constraints->max_uV = cmax; | |
4367cfdc DB |
894 | } |
895 | ||
3e2b9abd MB |
896 | /* voltage constraints are optional */ |
897 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 898 | return 0; |
3e2b9abd | 899 | |
4367cfdc | 900 | /* else require explicit machine-level constraints */ |
3e2b9abd | 901 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 902 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 903 | return -EINVAL; |
4367cfdc DB |
904 | } |
905 | ||
906 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
907 | for (i = 0; i < count; i++) { | |
908 | int value; | |
909 | ||
910 | value = ops->list_voltage(rdev, i); | |
911 | if (value <= 0) | |
912 | continue; | |
913 | ||
914 | /* maybe adjust [min_uV..max_uV] */ | |
915 | if (value >= cmin && value < min_uV) | |
916 | min_uV = value; | |
917 | if (value <= cmax && value > max_uV) | |
918 | max_uV = value; | |
919 | } | |
920 | ||
921 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
922 | if (max_uV < min_uV) { | |
fff15bef MB |
923 | rdev_err(rdev, |
924 | "unsupportable voltage constraints %u-%uuV\n", | |
925 | min_uV, max_uV); | |
e79055d6 | 926 | return -EINVAL; |
4367cfdc DB |
927 | } |
928 | ||
929 | /* use regulator's subset of machine constraints */ | |
930 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
931 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
932 | constraints->min_uV, min_uV); | |
4367cfdc DB |
933 | constraints->min_uV = min_uV; |
934 | } | |
935 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
936 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
937 | constraints->max_uV, max_uV); | |
4367cfdc DB |
938 | constraints->max_uV = max_uV; |
939 | } | |
940 | } | |
941 | ||
e79055d6 MB |
942 | return 0; |
943 | } | |
944 | ||
f8c1700d LD |
945 | static int machine_constraints_current(struct regulator_dev *rdev, |
946 | struct regulation_constraints *constraints) | |
947 | { | |
272e2315 | 948 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
949 | int ret; |
950 | ||
951 | if (!constraints->min_uA && !constraints->max_uA) | |
952 | return 0; | |
953 | ||
954 | if (constraints->min_uA > constraints->max_uA) { | |
955 | rdev_err(rdev, "Invalid current constraints\n"); | |
956 | return -EINVAL; | |
957 | } | |
958 | ||
959 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
960 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | /* Set regulator current in constraints range */ | |
965 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
966 | constraints->max_uA); | |
967 | if (ret < 0) { | |
968 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
969 | return ret; | |
970 | } | |
971 | ||
972 | return 0; | |
973 | } | |
974 | ||
30c21971 MP |
975 | static int _regulator_do_enable(struct regulator_dev *rdev); |
976 | ||
e79055d6 MB |
977 | /** |
978 | * set_machine_constraints - sets regulator constraints | |
979 | * @rdev: regulator source | |
980 | * @constraints: constraints to apply | |
981 | * | |
982 | * Allows platform initialisation code to define and constrain | |
983 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
984 | * Constraints *must* be set by platform code in order for some | |
985 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
986 | * set_mode. | |
987 | */ | |
988 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 989 | const struct regulation_constraints *constraints) |
e79055d6 MB |
990 | { |
991 | int ret = 0; | |
272e2315 | 992 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 993 | |
9a8f5e07 MB |
994 | if (constraints) |
995 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
996 | GFP_KERNEL); | |
997 | else | |
998 | rdev->constraints = kzalloc(sizeof(*constraints), | |
999 | GFP_KERNEL); | |
f8c12fe3 MB |
1000 | if (!rdev->constraints) |
1001 | return -ENOMEM; | |
af5866c9 | 1002 | |
f8c12fe3 | 1003 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
1004 | if (ret != 0) |
1005 | goto out; | |
1006 | ||
f8c1700d | 1007 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 MB |
1008 | if (ret != 0) |
1009 | goto out; | |
1010 | ||
a5766f11 | 1011 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1012 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 1013 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1014 | if (ret < 0) { |
5da84fd9 | 1015 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
1016 | goto out; |
1017 | } | |
1018 | } | |
a5766f11 | 1019 | |
9a8f5e07 | 1020 | if (rdev->constraints->initial_mode) { |
a308466c | 1021 | if (!ops->set_mode) { |
5da84fd9 | 1022 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
1023 | ret = -EINVAL; |
1024 | goto out; | |
1025 | } | |
1026 | ||
f8c12fe3 | 1027 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1028 | if (ret < 0) { |
5da84fd9 | 1029 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
1030 | goto out; |
1031 | } | |
1032 | } | |
1033 | ||
cacf90f2 MB |
1034 | /* If the constraints say the regulator should be on at this point |
1035 | * and we have control then make sure it is enabled. | |
1036 | */ | |
30c21971 MP |
1037 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1038 | ret = _regulator_do_enable(rdev); | |
1039 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1040 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
1041 | goto out; |
1042 | } | |
1043 | } | |
1044 | ||
1653ccf4 YSB |
1045 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1046 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1047 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1048 | if (ret < 0) { | |
1049 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
1050 | goto out; | |
1051 | } | |
1052 | } | |
1053 | ||
a5766f11 | 1054 | print_constraints(rdev); |
1a6958e7 | 1055 | return 0; |
a5766f11 | 1056 | out: |
1a6958e7 AL |
1057 | kfree(rdev->constraints); |
1058 | rdev->constraints = NULL; | |
a5766f11 LG |
1059 | return ret; |
1060 | } | |
1061 | ||
1062 | /** | |
1063 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1064 | * @rdev: regulator name |
1065 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1066 | * |
1067 | * Called by platform initialisation code to set the supply regulator for this | |
1068 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1069 | * core if it's child is enabled. | |
1070 | */ | |
1071 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1072 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1073 | { |
1074 | int err; | |
1075 | ||
3801b86a MB |
1076 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1077 | ||
1078 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1079 | if (rdev->supply == NULL) { |
1080 | err = -ENOMEM; | |
3801b86a | 1081 | return err; |
a5766f11 | 1082 | } |
57ad526a | 1083 | supply_rdev->open_count++; |
3801b86a MB |
1084 | |
1085 | return 0; | |
a5766f11 LG |
1086 | } |
1087 | ||
1088 | /** | |
06c63f93 | 1089 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1090 | * @rdev: regulator source |
40f9244f | 1091 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1092 | * @supply: symbolic name for supply |
a5766f11 LG |
1093 | * |
1094 | * Allows platform initialisation code to map physical regulator | |
1095 | * sources to symbolic names for supplies for use by devices. Devices | |
1096 | * should use these symbolic names to request regulators, avoiding the | |
1097 | * need to provide board-specific regulator names as platform data. | |
1098 | */ | |
1099 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1100 | const char *consumer_dev_name, |
1101 | const char *supply) | |
a5766f11 LG |
1102 | { |
1103 | struct regulator_map *node; | |
9ed2099e | 1104 | int has_dev; |
a5766f11 LG |
1105 | |
1106 | if (supply == NULL) | |
1107 | return -EINVAL; | |
1108 | ||
9ed2099e MB |
1109 | if (consumer_dev_name != NULL) |
1110 | has_dev = 1; | |
1111 | else | |
1112 | has_dev = 0; | |
1113 | ||
6001e13c | 1114 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1115 | if (node->dev_name && consumer_dev_name) { |
1116 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1117 | continue; | |
1118 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1119 | continue; |
23b5cc2a JN |
1120 | } |
1121 | ||
6001e13c DB |
1122 | if (strcmp(node->supply, supply) != 0) |
1123 | continue; | |
1124 | ||
737f360d MB |
1125 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1126 | consumer_dev_name, | |
1127 | dev_name(&node->regulator->dev), | |
1128 | node->regulator->desc->name, | |
1129 | supply, | |
1130 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1131 | return -EBUSY; |
1132 | } | |
1133 | ||
9ed2099e | 1134 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1135 | if (node == NULL) |
1136 | return -ENOMEM; | |
1137 | ||
1138 | node->regulator = rdev; | |
a5766f11 LG |
1139 | node->supply = supply; |
1140 | ||
9ed2099e MB |
1141 | if (has_dev) { |
1142 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1143 | if (node->dev_name == NULL) { | |
1144 | kfree(node); | |
1145 | return -ENOMEM; | |
1146 | } | |
40f9244f MB |
1147 | } |
1148 | ||
a5766f11 LG |
1149 | list_add(&node->list, ®ulator_map_list); |
1150 | return 0; | |
1151 | } | |
1152 | ||
0f1d747b MR |
1153 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1154 | { | |
1155 | struct regulator_map *node, *n; | |
1156 | ||
1157 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1158 | if (rdev == node->regulator) { | |
1159 | list_del(&node->list); | |
40f9244f | 1160 | kfree(node->dev_name); |
0f1d747b | 1161 | kfree(node); |
0f1d747b MR |
1162 | } |
1163 | } | |
1164 | } | |
1165 | ||
f5726ae3 | 1166 | #define REG_STR_SIZE 64 |
414c70cb LG |
1167 | |
1168 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1169 | struct device *dev, | |
1170 | const char *supply_name) | |
1171 | { | |
1172 | struct regulator *regulator; | |
1173 | char buf[REG_STR_SIZE]; | |
1174 | int err, size; | |
1175 | ||
1176 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1177 | if (regulator == NULL) | |
1178 | return NULL; | |
1179 | ||
1180 | mutex_lock(&rdev->mutex); | |
1181 | regulator->rdev = rdev; | |
1182 | list_add(®ulator->list, &rdev->consumer_list); | |
1183 | ||
1184 | if (dev) { | |
e2c98eaf SG |
1185 | regulator->dev = dev; |
1186 | ||
222cc7b1 | 1187 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1188 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1189 | dev->kobj.name, supply_name); | |
1190 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1191 | goto overflow_err; |
414c70cb LG |
1192 | |
1193 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1194 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1195 | goto overflow_err; |
414c70cb LG |
1196 | |
1197 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1198 | buf); | |
1199 | if (err) { | |
5da84fd9 JP |
1200 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1201 | dev->kobj.name, err); | |
222cc7b1 | 1202 | /* non-fatal */ |
414c70cb | 1203 | } |
5de70519 MB |
1204 | } else { |
1205 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1206 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1207 | goto overflow_err; |
5de70519 MB |
1208 | } |
1209 | ||
5de70519 MB |
1210 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1211 | rdev->debugfs); | |
24751434 | 1212 | if (!regulator->debugfs) { |
5de70519 | 1213 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1214 | } else { |
1215 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1216 | ®ulator->uA_load); | |
1217 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1218 | ®ulator->min_uV); | |
1219 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1220 | ®ulator->max_uV); | |
414c70cb | 1221 | } |
5de70519 | 1222 | |
6492bc1b MB |
1223 | /* |
1224 | * Check now if the regulator is an always on regulator - if | |
1225 | * it is then we don't need to do nearly so much work for | |
1226 | * enable/disable calls. | |
1227 | */ | |
1228 | if (!_regulator_can_change_status(rdev) && | |
1229 | _regulator_is_enabled(rdev)) | |
1230 | regulator->always_on = true; | |
1231 | ||
414c70cb LG |
1232 | mutex_unlock(&rdev->mutex); |
1233 | return regulator; | |
414c70cb LG |
1234 | overflow_err: |
1235 | list_del(®ulator->list); | |
1236 | kfree(regulator); | |
1237 | mutex_unlock(&rdev->mutex); | |
1238 | return NULL; | |
1239 | } | |
1240 | ||
31aae2be MB |
1241 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1242 | { | |
00c877c6 LD |
1243 | if (rdev->constraints && rdev->constraints->enable_time) |
1244 | return rdev->constraints->enable_time; | |
31aae2be | 1245 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1246 | return rdev->desc->enable_time; |
31aae2be MB |
1247 | return rdev->desc->ops->enable_time(rdev); |
1248 | } | |
1249 | ||
a06ccd9c CK |
1250 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1251 | struct device *dev, const char *supply) | |
1252 | { | |
1253 | struct regulator_supply_alias *map; | |
1254 | ||
1255 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1256 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1257 | return map; | |
1258 | ||
1259 | return NULL; | |
1260 | } | |
1261 | ||
1262 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1263 | { | |
1264 | struct regulator_supply_alias *map; | |
1265 | ||
1266 | map = regulator_find_supply_alias(*dev, *supply); | |
1267 | if (map) { | |
1268 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1269 | *supply, map->alias_supply, | |
1270 | dev_name(map->alias_dev)); | |
1271 | *dev = map->alias_dev; | |
1272 | *supply = map->alias_supply; | |
1273 | } | |
1274 | } | |
1275 | ||
69511a45 | 1276 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1277 | const char *supply, |
1278 | int *ret) | |
69511a45 RN |
1279 | { |
1280 | struct regulator_dev *r; | |
1281 | struct device_node *node; | |
576ca436 MB |
1282 | struct regulator_map *map; |
1283 | const char *devname = NULL; | |
69511a45 | 1284 | |
a06ccd9c CK |
1285 | regulator_supply_alias(&dev, &supply); |
1286 | ||
69511a45 RN |
1287 | /* first do a dt based lookup */ |
1288 | if (dev && dev->of_node) { | |
1289 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1290 | if (node) { |
69511a45 RN |
1291 | list_for_each_entry(r, ®ulator_list, list) |
1292 | if (r->dev.parent && | |
1293 | node == r->dev.of_node) | |
1294 | return r; | |
317b5684 MB |
1295 | *ret = -EPROBE_DEFER; |
1296 | return NULL; | |
6d191a5f MB |
1297 | } else { |
1298 | /* | |
1299 | * If we couldn't even get the node then it's | |
1300 | * not just that the device didn't register | |
1301 | * yet, there's no node and we'll never | |
1302 | * succeed. | |
1303 | */ | |
1304 | *ret = -ENODEV; | |
1305 | } | |
69511a45 RN |
1306 | } |
1307 | ||
1308 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1309 | if (dev) |
1310 | devname = dev_name(dev); | |
1311 | ||
69511a45 RN |
1312 | list_for_each_entry(r, ®ulator_list, list) |
1313 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1314 | return r; | |
1315 | ||
576ca436 MB |
1316 | list_for_each_entry(map, ®ulator_map_list, list) { |
1317 | /* If the mapping has a device set up it must match */ | |
1318 | if (map->dev_name && | |
1319 | (!devname || strcmp(map->dev_name, devname))) | |
1320 | continue; | |
1321 | ||
1322 | if (strcmp(map->supply, supply) == 0) | |
1323 | return map->regulator; | |
1324 | } | |
1325 | ||
1326 | ||
69511a45 RN |
1327 | return NULL; |
1328 | } | |
1329 | ||
6261b06d BA |
1330 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1331 | { | |
1332 | struct regulator_dev *r; | |
1333 | struct device *dev = rdev->dev.parent; | |
1334 | int ret; | |
1335 | ||
1336 | /* No supply to resovle? */ | |
1337 | if (!rdev->supply_name) | |
1338 | return 0; | |
1339 | ||
1340 | /* Supply already resolved? */ | |
1341 | if (rdev->supply) | |
1342 | return 0; | |
1343 | ||
1344 | r = regulator_dev_lookup(dev, rdev->supply_name, &ret); | |
1345 | if (ret == -ENODEV) { | |
1346 | /* | |
1347 | * No supply was specified for this regulator and | |
1348 | * there will never be one. | |
1349 | */ | |
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | if (!r) { | |
1354 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1355 | rdev->supply_name, rdev->desc->name); | |
1356 | return -EPROBE_DEFER; | |
1357 | } | |
1358 | ||
1359 | /* Recursively resolve the supply of the supply */ | |
1360 | ret = regulator_resolve_supply(r); | |
1361 | if (ret < 0) | |
1362 | return ret; | |
1363 | ||
1364 | ret = set_supply(rdev, r); | |
1365 | if (ret < 0) | |
1366 | return ret; | |
1367 | ||
1368 | /* Cascade always-on state to supply */ | |
1369 | if (_regulator_is_enabled(rdev)) { | |
1370 | ret = regulator_enable(rdev->supply); | |
1371 | if (ret < 0) | |
1372 | return ret; | |
1373 | } | |
1374 | ||
1375 | return 0; | |
1376 | } | |
1377 | ||
5ffbd136 MB |
1378 | /* Internal regulator request function */ |
1379 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1380 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1381 | { |
1382 | struct regulator_dev *rdev; | |
04bf3011 | 1383 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1384 | const char *devname = NULL; |
317b5684 | 1385 | int ret; |
414c70cb LG |
1386 | |
1387 | if (id == NULL) { | |
5da84fd9 | 1388 | pr_err("get() with no identifier\n"); |
043c998f | 1389 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1390 | } |
1391 | ||
40f9244f MB |
1392 | if (dev) |
1393 | devname = dev_name(dev); | |
1394 | ||
317b5684 MB |
1395 | if (have_full_constraints()) |
1396 | ret = -ENODEV; | |
1397 | else | |
1398 | ret = -EPROBE_DEFER; | |
1399 | ||
414c70cb LG |
1400 | mutex_lock(®ulator_list_mutex); |
1401 | ||
6d191a5f | 1402 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1403 | if (rdev) |
1404 | goto found; | |
1405 | ||
ef60abbb MB |
1406 | regulator = ERR_PTR(ret); |
1407 | ||
1e4b545c NM |
1408 | /* |
1409 | * If we have return value from dev_lookup fail, we do not expect to | |
1410 | * succeed, so, quit with appropriate error value | |
1411 | */ | |
0d25d09d | 1412 | if (ret && ret != -ENODEV) |
1e4b545c | 1413 | goto out; |
1e4b545c | 1414 | |
34abbd68 MB |
1415 | if (!devname) |
1416 | devname = "deviceless"; | |
1417 | ||
4ddfebd3 MB |
1418 | /* |
1419 | * Assume that a regulator is physically present and enabled | |
1420 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1421 | */ |
87b28417 | 1422 | if (have_full_constraints() && allow_dummy) { |
5da84fd9 JP |
1423 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1424 | devname, id); | |
4ddfebd3 | 1425 | |
34abbd68 MB |
1426 | rdev = dummy_regulator_rdev; |
1427 | goto found; | |
0781719b HG |
1428 | /* Don't log an error when called from regulator_get_optional() */ |
1429 | } else if (!have_full_constraints() || exclusive) { | |
acc3d5ce | 1430 | dev_warn(dev, "dummy supplies not allowed\n"); |
34abbd68 | 1431 | } |
34abbd68 | 1432 | |
414c70cb LG |
1433 | mutex_unlock(®ulator_list_mutex); |
1434 | return regulator; | |
1435 | ||
1436 | found: | |
5ffbd136 MB |
1437 | if (rdev->exclusive) { |
1438 | regulator = ERR_PTR(-EPERM); | |
1439 | goto out; | |
1440 | } | |
1441 | ||
1442 | if (exclusive && rdev->open_count) { | |
1443 | regulator = ERR_PTR(-EBUSY); | |
1444 | goto out; | |
1445 | } | |
1446 | ||
6261b06d BA |
1447 | ret = regulator_resolve_supply(rdev); |
1448 | if (ret < 0) { | |
1449 | regulator = ERR_PTR(ret); | |
1450 | goto out; | |
1451 | } | |
1452 | ||
a5766f11 LG |
1453 | if (!try_module_get(rdev->owner)) |
1454 | goto out; | |
1455 | ||
414c70cb LG |
1456 | regulator = create_regulator(rdev, dev, id); |
1457 | if (regulator == NULL) { | |
1458 | regulator = ERR_PTR(-ENOMEM); | |
1459 | module_put(rdev->owner); | |
bcda4321 | 1460 | goto out; |
414c70cb LG |
1461 | } |
1462 | ||
5ffbd136 MB |
1463 | rdev->open_count++; |
1464 | if (exclusive) { | |
1465 | rdev->exclusive = 1; | |
1466 | ||
1467 | ret = _regulator_is_enabled(rdev); | |
1468 | if (ret > 0) | |
1469 | rdev->use_count = 1; | |
1470 | else | |
1471 | rdev->use_count = 0; | |
1472 | } | |
1473 | ||
a5766f11 | 1474 | out: |
414c70cb | 1475 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1476 | |
414c70cb LG |
1477 | return regulator; |
1478 | } | |
5ffbd136 MB |
1479 | |
1480 | /** | |
1481 | * regulator_get - lookup and obtain a reference to a regulator. | |
1482 | * @dev: device for regulator "consumer" | |
1483 | * @id: Supply name or regulator ID. | |
1484 | * | |
1485 | * Returns a struct regulator corresponding to the regulator producer, | |
1486 | * or IS_ERR() condition containing errno. | |
1487 | * | |
1488 | * Use of supply names configured via regulator_set_device_supply() is | |
1489 | * strongly encouraged. It is recommended that the supply name used | |
1490 | * should match the name used for the supply and/or the relevant | |
1491 | * device pins in the datasheet. | |
1492 | */ | |
1493 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1494 | { | |
4ddfebd3 | 1495 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1496 | } |
414c70cb LG |
1497 | EXPORT_SYMBOL_GPL(regulator_get); |
1498 | ||
5ffbd136 MB |
1499 | /** |
1500 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1501 | * @dev: device for regulator "consumer" | |
1502 | * @id: Supply name or regulator ID. | |
1503 | * | |
1504 | * Returns a struct regulator corresponding to the regulator producer, | |
1505 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1506 | * unable to obtain this regulator while this reference is held and the |
1507 | * use count for the regulator will be initialised to reflect the current | |
1508 | * state of the regulator. | |
5ffbd136 MB |
1509 | * |
1510 | * This is intended for use by consumers which cannot tolerate shared | |
1511 | * use of the regulator such as those which need to force the | |
1512 | * regulator off for correct operation of the hardware they are | |
1513 | * controlling. | |
1514 | * | |
1515 | * Use of supply names configured via regulator_set_device_supply() is | |
1516 | * strongly encouraged. It is recommended that the supply name used | |
1517 | * should match the name used for the supply and/or the relevant | |
1518 | * device pins in the datasheet. | |
1519 | */ | |
1520 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1521 | { | |
4ddfebd3 | 1522 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1523 | } |
1524 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1525 | ||
de1dd9fd MB |
1526 | /** |
1527 | * regulator_get_optional - obtain optional access to a regulator. | |
1528 | * @dev: device for regulator "consumer" | |
1529 | * @id: Supply name or regulator ID. | |
1530 | * | |
1531 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1532 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1533 | * |
1534 | * This is intended for use by consumers for devices which can have | |
1535 | * some supplies unconnected in normal use, such as some MMC devices. | |
1536 | * It can allow the regulator core to provide stub supplies for other | |
1537 | * supplies requested using normal regulator_get() calls without | |
1538 | * disrupting the operation of drivers that can handle absent | |
1539 | * supplies. | |
1540 | * | |
1541 | * Use of supply names configured via regulator_set_device_supply() is | |
1542 | * strongly encouraged. It is recommended that the supply name used | |
1543 | * should match the name used for the supply and/or the relevant | |
1544 | * device pins in the datasheet. | |
1545 | */ | |
1546 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1547 | { | |
4ddfebd3 | 1548 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1549 | } |
1550 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1551 | ||
83b0302d | 1552 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1553 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1554 | { |
1555 | struct regulator_dev *rdev; | |
1556 | ||
1557 | if (regulator == NULL || IS_ERR(regulator)) | |
1558 | return; | |
1559 | ||
414c70cb LG |
1560 | rdev = regulator->rdev; |
1561 | ||
5de70519 | 1562 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1563 | |
414c70cb | 1564 | /* remove any sysfs entries */ |
e2c98eaf | 1565 | if (regulator->dev) |
414c70cb | 1566 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
83b0302d | 1567 | mutex_lock(&rdev->mutex); |
5de70519 | 1568 | kfree(regulator->supply_name); |
414c70cb LG |
1569 | list_del(®ulator->list); |
1570 | kfree(regulator); | |
1571 | ||
5ffbd136 MB |
1572 | rdev->open_count--; |
1573 | rdev->exclusive = 0; | |
83b0302d | 1574 | mutex_unlock(&rdev->mutex); |
5ffbd136 | 1575 | |
414c70cb | 1576 | module_put(rdev->owner); |
23ff2f0f CK |
1577 | } |
1578 | ||
1579 | /** | |
1580 | * regulator_put - "free" the regulator source | |
1581 | * @regulator: regulator source | |
1582 | * | |
1583 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1584 | * regulator source are balanced by regulator_disable calls prior to calling | |
1585 | * this function. | |
1586 | */ | |
1587 | void regulator_put(struct regulator *regulator) | |
1588 | { | |
1589 | mutex_lock(®ulator_list_mutex); | |
1590 | _regulator_put(regulator); | |
414c70cb LG |
1591 | mutex_unlock(®ulator_list_mutex); |
1592 | } | |
1593 | EXPORT_SYMBOL_GPL(regulator_put); | |
1594 | ||
a06ccd9c CK |
1595 | /** |
1596 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1597 | * | |
1598 | * @dev: device that will be given as the regulator "consumer" | |
1599 | * @id: Supply name or regulator ID | |
1600 | * @alias_dev: device that should be used to lookup the supply | |
1601 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1602 | * supply | |
1603 | * | |
1604 | * All lookups for id on dev will instead be conducted for alias_id on | |
1605 | * alias_dev. | |
1606 | */ | |
1607 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1608 | struct device *alias_dev, | |
1609 | const char *alias_id) | |
1610 | { | |
1611 | struct regulator_supply_alias *map; | |
1612 | ||
1613 | map = regulator_find_supply_alias(dev, id); | |
1614 | if (map) | |
1615 | return -EEXIST; | |
1616 | ||
1617 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1618 | if (!map) | |
1619 | return -ENOMEM; | |
1620 | ||
1621 | map->src_dev = dev; | |
1622 | map->src_supply = id; | |
1623 | map->alias_dev = alias_dev; | |
1624 | map->alias_supply = alias_id; | |
1625 | ||
1626 | list_add(&map->list, ®ulator_supply_alias_list); | |
1627 | ||
1628 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1629 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1630 | ||
1631 | return 0; | |
1632 | } | |
1633 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1634 | ||
1635 | /** | |
1636 | * regulator_unregister_supply_alias - Remove device alias | |
1637 | * | |
1638 | * @dev: device that will be given as the regulator "consumer" | |
1639 | * @id: Supply name or regulator ID | |
1640 | * | |
1641 | * Remove a lookup alias if one exists for id on dev. | |
1642 | */ | |
1643 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1644 | { | |
1645 | struct regulator_supply_alias *map; | |
1646 | ||
1647 | map = regulator_find_supply_alias(dev, id); | |
1648 | if (map) { | |
1649 | list_del(&map->list); | |
1650 | kfree(map); | |
1651 | } | |
1652 | } | |
1653 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1654 | ||
1655 | /** | |
1656 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1657 | * | |
1658 | * @dev: device that will be given as the regulator "consumer" | |
1659 | * @id: List of supply names or regulator IDs | |
1660 | * @alias_dev: device that should be used to lookup the supply | |
1661 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1662 | * lookup the supply | |
1663 | * @num_id: Number of aliases to register | |
1664 | * | |
1665 | * @return 0 on success, an errno on failure. | |
1666 | * | |
1667 | * This helper function allows drivers to register several supply | |
1668 | * aliases in one operation. If any of the aliases cannot be | |
1669 | * registered any aliases that were registered will be removed | |
1670 | * before returning to the caller. | |
1671 | */ | |
9f8c0fe9 LJ |
1672 | int regulator_bulk_register_supply_alias(struct device *dev, |
1673 | const char *const *id, | |
a06ccd9c | 1674 | struct device *alias_dev, |
9f8c0fe9 | 1675 | const char *const *alias_id, |
a06ccd9c CK |
1676 | int num_id) |
1677 | { | |
1678 | int i; | |
1679 | int ret; | |
1680 | ||
1681 | for (i = 0; i < num_id; ++i) { | |
1682 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1683 | alias_id[i]); | |
1684 | if (ret < 0) | |
1685 | goto err; | |
1686 | } | |
1687 | ||
1688 | return 0; | |
1689 | ||
1690 | err: | |
1691 | dev_err(dev, | |
1692 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1693 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1694 | ||
1695 | while (--i >= 0) | |
1696 | regulator_unregister_supply_alias(dev, id[i]); | |
1697 | ||
1698 | return ret; | |
1699 | } | |
1700 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1701 | ||
1702 | /** | |
1703 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1704 | * | |
1705 | * @dev: device that will be given as the regulator "consumer" | |
1706 | * @id: List of supply names or regulator IDs | |
1707 | * @num_id: Number of aliases to unregister | |
1708 | * | |
1709 | * This helper function allows drivers to unregister several supply | |
1710 | * aliases in one operation. | |
1711 | */ | |
1712 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1713 | const char *const *id, |
a06ccd9c CK |
1714 | int num_id) |
1715 | { | |
1716 | int i; | |
1717 | ||
1718 | for (i = 0; i < num_id; ++i) | |
1719 | regulator_unregister_supply_alias(dev, id[i]); | |
1720 | } | |
1721 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1722 | ||
1723 | ||
f19b00da KM |
1724 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1725 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1726 | const struct regulator_config *config) | |
1727 | { | |
1728 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1729 | struct gpio_desc *gpiod; |
f19b00da KM |
1730 | int ret; |
1731 | ||
778b28b4 RK |
1732 | gpiod = gpio_to_desc(config->ena_gpio); |
1733 | ||
f19b00da | 1734 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1735 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1736 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1737 | config->ena_gpio); | |
1738 | goto update_ena_gpio_to_rdev; | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | ret = gpio_request_one(config->ena_gpio, | |
1743 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1744 | rdev_get_name(rdev)); | |
1745 | if (ret) | |
1746 | return ret; | |
1747 | ||
1748 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1749 | if (pin == NULL) { | |
1750 | gpio_free(config->ena_gpio); | |
1751 | return -ENOMEM; | |
1752 | } | |
1753 | ||
778b28b4 | 1754 | pin->gpiod = gpiod; |
f19b00da KM |
1755 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1756 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1757 | ||
1758 | update_ena_gpio_to_rdev: | |
1759 | pin->request_count++; | |
1760 | rdev->ena_pin = pin; | |
1761 | return 0; | |
1762 | } | |
1763 | ||
1764 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1765 | { | |
1766 | struct regulator_enable_gpio *pin, *n; | |
1767 | ||
1768 | if (!rdev->ena_pin) | |
1769 | return; | |
1770 | ||
1771 | /* Free the GPIO only in case of no use */ | |
1772 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1773 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1774 | if (pin->request_count <= 1) { |
1775 | pin->request_count = 0; | |
778b28b4 | 1776 | gpiod_put(pin->gpiod); |
f19b00da KM |
1777 | list_del(&pin->list); |
1778 | kfree(pin); | |
60a2362f SWK |
1779 | rdev->ena_pin = NULL; |
1780 | return; | |
f19b00da KM |
1781 | } else { |
1782 | pin->request_count--; | |
1783 | } | |
1784 | } | |
1785 | } | |
1786 | } | |
1787 | ||
967cfb18 | 1788 | /** |
31d6eebf RD |
1789 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1790 | * @rdev: regulator_dev structure | |
1791 | * @enable: enable GPIO at initial use? | |
1792 | * | |
967cfb18 KM |
1793 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1794 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1795 | */ | |
1796 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1797 | { | |
1798 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1799 | ||
1800 | if (!pin) | |
1801 | return -EINVAL; | |
1802 | ||
1803 | if (enable) { | |
1804 | /* Enable GPIO at initial use */ | |
1805 | if (pin->enable_count == 0) | |
778b28b4 RK |
1806 | gpiod_set_value_cansleep(pin->gpiod, |
1807 | !pin->ena_gpio_invert); | |
967cfb18 KM |
1808 | |
1809 | pin->enable_count++; | |
1810 | } else { | |
1811 | if (pin->enable_count > 1) { | |
1812 | pin->enable_count--; | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | /* Disable GPIO if not used */ | |
1817 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
1818 | gpiod_set_value_cansleep(pin->gpiod, |
1819 | pin->ena_gpio_invert); | |
967cfb18 KM |
1820 | pin->enable_count = 0; |
1821 | } | |
1822 | } | |
1823 | ||
1824 | return 0; | |
1825 | } | |
1826 | ||
79fd1141 GX |
1827 | /** |
1828 | * _regulator_enable_delay - a delay helper function | |
1829 | * @delay: time to delay in microseconds | |
1830 | * | |
1831 | * Delay for the requested amount of time as per the guidelines in: | |
1832 | * | |
1833 | * Documentation/timers/timers-howto.txt | |
1834 | * | |
1835 | * The assumption here is that regulators will never be enabled in | |
1836 | * atomic context and therefore sleeping functions can be used. | |
1837 | */ | |
1838 | static void _regulator_enable_delay(unsigned int delay) | |
1839 | { | |
1840 | unsigned int ms = delay / 1000; | |
1841 | unsigned int us = delay % 1000; | |
1842 | ||
1843 | if (ms > 0) { | |
1844 | /* | |
1845 | * For small enough values, handle super-millisecond | |
1846 | * delays in the usleep_range() call below. | |
1847 | */ | |
1848 | if (ms < 20) | |
1849 | us += ms * 1000; | |
1850 | else | |
1851 | msleep(ms); | |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * Give the scheduler some room to coalesce with any other | |
1856 | * wakeup sources. For delays shorter than 10 us, don't even | |
1857 | * bother setting up high-resolution timers and just busy- | |
1858 | * loop. | |
1859 | */ | |
1860 | if (us >= 10) | |
1861 | usleep_range(us, us + 100); | |
1862 | else | |
1863 | udelay(us); | |
1864 | } | |
1865 | ||
5c5659d0 MB |
1866 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1867 | { | |
1868 | int ret, delay; | |
1869 | ||
1870 | /* Query before enabling in case configuration dependent. */ | |
1871 | ret = _regulator_get_enable_time(rdev); | |
1872 | if (ret >= 0) { | |
1873 | delay = ret; | |
1874 | } else { | |
1875 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1876 | delay = 0; | |
1877 | } | |
1878 | ||
1879 | trace_regulator_enable(rdev_get_name(rdev)); | |
1880 | ||
871f5650 GX |
1881 | if (rdev->desc->off_on_delay) { |
1882 | /* if needed, keep a distance of off_on_delay from last time | |
1883 | * this regulator was disabled. | |
1884 | */ | |
1885 | unsigned long start_jiffy = jiffies; | |
1886 | unsigned long intended, max_delay, remaining; | |
1887 | ||
1888 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
1889 | intended = rdev->last_off_jiffy + max_delay; | |
1890 | ||
1891 | if (time_before(start_jiffy, intended)) { | |
1892 | /* calc remaining jiffies to deal with one-time | |
1893 | * timer wrapping. | |
1894 | * in case of multiple timer wrapping, either it can be | |
1895 | * detected by out-of-range remaining, or it cannot be | |
1896 | * detected and we gets a panelty of | |
1897 | * _regulator_enable_delay(). | |
1898 | */ | |
1899 | remaining = intended - start_jiffy; | |
1900 | if (remaining <= max_delay) | |
1901 | _regulator_enable_delay( | |
1902 | jiffies_to_usecs(remaining)); | |
1903 | } | |
1904 | } | |
1905 | ||
967cfb18 | 1906 | if (rdev->ena_pin) { |
29d62ec5 DA |
1907 | if (!rdev->ena_gpio_state) { |
1908 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1909 | if (ret < 0) | |
1910 | return ret; | |
1911 | rdev->ena_gpio_state = 1; | |
1912 | } | |
65f73508 | 1913 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
1914 | ret = rdev->desc->ops->enable(rdev); |
1915 | if (ret < 0) | |
1916 | return ret; | |
1917 | } else { | |
1918 | return -EINVAL; | |
1919 | } | |
1920 | ||
1921 | /* Allow the regulator to ramp; it would be useful to extend | |
1922 | * this for bulk operations so that the regulators can ramp | |
1923 | * together. */ | |
1924 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1925 | ||
79fd1141 | 1926 | _regulator_enable_delay(delay); |
5c5659d0 MB |
1927 | |
1928 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1929 | ||
1930 | return 0; | |
1931 | } | |
1932 | ||
414c70cb LG |
1933 | /* locks held by regulator_enable() */ |
1934 | static int _regulator_enable(struct regulator_dev *rdev) | |
1935 | { | |
5c5659d0 | 1936 | int ret; |
414c70cb | 1937 | |
414c70cb | 1938 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1939 | if (rdev->constraints && |
1940 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1941 | drms_uA_update(rdev); | |
414c70cb | 1942 | |
9a2372fa MB |
1943 | if (rdev->use_count == 0) { |
1944 | /* The regulator may on if it's not switchable or left on */ | |
1945 | ret = _regulator_is_enabled(rdev); | |
1946 | if (ret == -EINVAL || ret == 0) { | |
1947 | if (!_regulator_can_change_status(rdev)) | |
1948 | return -EPERM; | |
1949 | ||
5c5659d0 | 1950 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1951 | if (ret < 0) |
1952 | return ret; | |
1953 | ||
a7433cff | 1954 | } else if (ret < 0) { |
5da84fd9 | 1955 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1956 | return ret; |
1957 | } | |
a7433cff | 1958 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1959 | } |
1960 | ||
9a2372fa MB |
1961 | rdev->use_count++; |
1962 | ||
1963 | return 0; | |
414c70cb LG |
1964 | } |
1965 | ||
1966 | /** | |
1967 | * regulator_enable - enable regulator output | |
1968 | * @regulator: regulator source | |
1969 | * | |
cf7bbcdf MB |
1970 | * Request that the regulator be enabled with the regulator output at |
1971 | * the predefined voltage or current value. Calls to regulator_enable() | |
1972 | * must be balanced with calls to regulator_disable(). | |
1973 | * | |
414c70cb | 1974 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1975 | * hardwired in the regulator. |
414c70cb LG |
1976 | */ |
1977 | int regulator_enable(struct regulator *regulator) | |
1978 | { | |
412aec61 DB |
1979 | struct regulator_dev *rdev = regulator->rdev; |
1980 | int ret = 0; | |
414c70cb | 1981 | |
6492bc1b MB |
1982 | if (regulator->always_on) |
1983 | return 0; | |
1984 | ||
3801b86a MB |
1985 | if (rdev->supply) { |
1986 | ret = regulator_enable(rdev->supply); | |
1987 | if (ret != 0) | |
1988 | return ret; | |
1989 | } | |
1990 | ||
412aec61 | 1991 | mutex_lock(&rdev->mutex); |
cd94b505 | 1992 | ret = _regulator_enable(rdev); |
412aec61 | 1993 | mutex_unlock(&rdev->mutex); |
3801b86a | 1994 | |
d1685e4e | 1995 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1996 | regulator_disable(rdev->supply); |
1997 | ||
414c70cb LG |
1998 | return ret; |
1999 | } | |
2000 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2001 | ||
5c5659d0 MB |
2002 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2003 | { | |
2004 | int ret; | |
2005 | ||
2006 | trace_regulator_disable(rdev_get_name(rdev)); | |
2007 | ||
967cfb18 | 2008 | if (rdev->ena_pin) { |
29d62ec5 DA |
2009 | if (rdev->ena_gpio_state) { |
2010 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2011 | if (ret < 0) | |
2012 | return ret; | |
2013 | rdev->ena_gpio_state = 0; | |
2014 | } | |
5c5659d0 MB |
2015 | |
2016 | } else if (rdev->desc->ops->disable) { | |
2017 | ret = rdev->desc->ops->disable(rdev); | |
2018 | if (ret != 0) | |
2019 | return ret; | |
2020 | } | |
2021 | ||
871f5650 GX |
2022 | /* cares about last_off_jiffy only if off_on_delay is required by |
2023 | * device. | |
2024 | */ | |
2025 | if (rdev->desc->off_on_delay) | |
2026 | rdev->last_off_jiffy = jiffies; | |
2027 | ||
5c5659d0 MB |
2028 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2029 | ||
5c5659d0 MB |
2030 | return 0; |
2031 | } | |
2032 | ||
414c70cb | 2033 | /* locks held by regulator_disable() */ |
3801b86a | 2034 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2035 | { |
2036 | int ret = 0; | |
2037 | ||
cd94b505 | 2038 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2039 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2040 | return -EIO; |
2041 | ||
414c70cb | 2042 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2043 | if (rdev->use_count == 1 && |
2044 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2045 | |
2046 | /* we are last user */ | |
5c5659d0 | 2047 | if (_regulator_can_change_status(rdev)) { |
a1c8a551 RF |
2048 | ret = _notifier_call_chain(rdev, |
2049 | REGULATOR_EVENT_PRE_DISABLE, | |
2050 | NULL); | |
2051 | if (ret & NOTIFY_STOP_MASK) | |
2052 | return -EINVAL; | |
2053 | ||
5c5659d0 | 2054 | ret = _regulator_do_disable(rdev); |
414c70cb | 2055 | if (ret < 0) { |
5da84fd9 | 2056 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2057 | _notifier_call_chain(rdev, |
2058 | REGULATOR_EVENT_ABORT_DISABLE, | |
2059 | NULL); | |
414c70cb LG |
2060 | return ret; |
2061 | } | |
66fda75f MP |
2062 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2063 | NULL); | |
414c70cb LG |
2064 | } |
2065 | ||
414c70cb LG |
2066 | rdev->use_count = 0; |
2067 | } else if (rdev->use_count > 1) { | |
2068 | ||
2069 | if (rdev->constraints && | |
2070 | (rdev->constraints->valid_ops_mask & | |
2071 | REGULATOR_CHANGE_DRMS)) | |
2072 | drms_uA_update(rdev); | |
2073 | ||
2074 | rdev->use_count--; | |
2075 | } | |
3801b86a | 2076 | |
414c70cb LG |
2077 | return ret; |
2078 | } | |
2079 | ||
2080 | /** | |
2081 | * regulator_disable - disable regulator output | |
2082 | * @regulator: regulator source | |
2083 | * | |
cf7bbcdf MB |
2084 | * Disable the regulator output voltage or current. Calls to |
2085 | * regulator_enable() must be balanced with calls to | |
2086 | * regulator_disable(). | |
69279fb9 | 2087 | * |
414c70cb | 2088 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2089 | * devices have it enabled, the regulator device supports disabling and |
2090 | * machine constraints permit this operation. | |
414c70cb LG |
2091 | */ |
2092 | int regulator_disable(struct regulator *regulator) | |
2093 | { | |
412aec61 DB |
2094 | struct regulator_dev *rdev = regulator->rdev; |
2095 | int ret = 0; | |
414c70cb | 2096 | |
6492bc1b MB |
2097 | if (regulator->always_on) |
2098 | return 0; | |
2099 | ||
412aec61 | 2100 | mutex_lock(&rdev->mutex); |
3801b86a | 2101 | ret = _regulator_disable(rdev); |
412aec61 | 2102 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2103 | |
3801b86a MB |
2104 | if (ret == 0 && rdev->supply) |
2105 | regulator_disable(rdev->supply); | |
8cbf811d | 2106 | |
414c70cb LG |
2107 | return ret; |
2108 | } | |
2109 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2110 | ||
2111 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2112 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2113 | { |
2114 | int ret = 0; | |
2115 | ||
a1c8a551 RF |
2116 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2117 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2118 | if (ret & NOTIFY_STOP_MASK) | |
2119 | return -EINVAL; | |
2120 | ||
66fda75f MP |
2121 | ret = _regulator_do_disable(rdev); |
2122 | if (ret < 0) { | |
2123 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2124 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2125 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2126 | return ret; |
414c70cb LG |
2127 | } |
2128 | ||
66fda75f MP |
2129 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2130 | REGULATOR_EVENT_DISABLE, NULL); | |
2131 | ||
2132 | return 0; | |
414c70cb LG |
2133 | } |
2134 | ||
2135 | /** | |
2136 | * regulator_force_disable - force disable regulator output | |
2137 | * @regulator: regulator source | |
2138 | * | |
2139 | * Forcibly disable the regulator output voltage or current. | |
2140 | * NOTE: this *will* disable the regulator output even if other consumer | |
2141 | * devices have it enabled. This should be used for situations when device | |
2142 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2143 | */ | |
2144 | int regulator_force_disable(struct regulator *regulator) | |
2145 | { | |
82d15839 | 2146 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2147 | int ret; |
2148 | ||
82d15839 | 2149 | mutex_lock(&rdev->mutex); |
414c70cb | 2150 | regulator->uA_load = 0; |
3801b86a | 2151 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2152 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2153 | |
3801b86a MB |
2154 | if (rdev->supply) |
2155 | while (rdev->open_count--) | |
2156 | regulator_disable(rdev->supply); | |
8cbf811d | 2157 | |
414c70cb LG |
2158 | return ret; |
2159 | } | |
2160 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2161 | ||
da07ecd9 MB |
2162 | static void regulator_disable_work(struct work_struct *work) |
2163 | { | |
2164 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2165 | disable_work.work); | |
2166 | int count, i, ret; | |
2167 | ||
2168 | mutex_lock(&rdev->mutex); | |
2169 | ||
2170 | BUG_ON(!rdev->deferred_disables); | |
2171 | ||
2172 | count = rdev->deferred_disables; | |
2173 | rdev->deferred_disables = 0; | |
2174 | ||
2175 | for (i = 0; i < count; i++) { | |
2176 | ret = _regulator_disable(rdev); | |
2177 | if (ret != 0) | |
2178 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2179 | } | |
2180 | ||
2181 | mutex_unlock(&rdev->mutex); | |
2182 | ||
2183 | if (rdev->supply) { | |
2184 | for (i = 0; i < count; i++) { | |
2185 | ret = regulator_disable(rdev->supply); | |
2186 | if (ret != 0) { | |
2187 | rdev_err(rdev, | |
2188 | "Supply disable failed: %d\n", ret); | |
2189 | } | |
2190 | } | |
2191 | } | |
2192 | } | |
2193 | ||
2194 | /** | |
2195 | * regulator_disable_deferred - disable regulator output with delay | |
2196 | * @regulator: regulator source | |
2197 | * @ms: miliseconds until the regulator is disabled | |
2198 | * | |
2199 | * Execute regulator_disable() on the regulator after a delay. This | |
2200 | * is intended for use with devices that require some time to quiesce. | |
2201 | * | |
2202 | * NOTE: this will only disable the regulator output if no other consumer | |
2203 | * devices have it enabled, the regulator device supports disabling and | |
2204 | * machine constraints permit this operation. | |
2205 | */ | |
2206 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2207 | { | |
2208 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 2209 | int ret; |
da07ecd9 | 2210 | |
6492bc1b MB |
2211 | if (regulator->always_on) |
2212 | return 0; | |
2213 | ||
2b5a24a0 MB |
2214 | if (!ms) |
2215 | return regulator_disable(regulator); | |
2216 | ||
da07ecd9 MB |
2217 | mutex_lock(&rdev->mutex); |
2218 | rdev->deferred_disables++; | |
2219 | mutex_unlock(&rdev->mutex); | |
2220 | ||
070260f0 MB |
2221 | ret = queue_delayed_work(system_power_efficient_wq, |
2222 | &rdev->disable_work, | |
2223 | msecs_to_jiffies(ms)); | |
aa59802d MB |
2224 | if (ret < 0) |
2225 | return ret; | |
2226 | else | |
2227 | return 0; | |
da07ecd9 MB |
2228 | } |
2229 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2230 | ||
414c70cb LG |
2231 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2232 | { | |
65f73508 | 2233 | /* A GPIO control always takes precedence */ |
7b74d149 | 2234 | if (rdev->ena_pin) |
65f73508 MB |
2235 | return rdev->ena_gpio_state; |
2236 | ||
9a7f6a4c | 2237 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2238 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2239 | return 1; |
414c70cb | 2240 | |
9332546f | 2241 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2242 | } |
2243 | ||
2244 | /** | |
2245 | * regulator_is_enabled - is the regulator output enabled | |
2246 | * @regulator: regulator source | |
2247 | * | |
412aec61 DB |
2248 | * Returns positive if the regulator driver backing the source/client |
2249 | * has requested that the device be enabled, zero if it hasn't, else a | |
2250 | * negative errno code. | |
2251 | * | |
2252 | * Note that the device backing this regulator handle can have multiple | |
2253 | * users, so it might be enabled even if regulator_enable() was never | |
2254 | * called for this particular source. | |
414c70cb LG |
2255 | */ |
2256 | int regulator_is_enabled(struct regulator *regulator) | |
2257 | { | |
9332546f MB |
2258 | int ret; |
2259 | ||
6492bc1b MB |
2260 | if (regulator->always_on) |
2261 | return 1; | |
2262 | ||
9332546f MB |
2263 | mutex_lock(®ulator->rdev->mutex); |
2264 | ret = _regulator_is_enabled(regulator->rdev); | |
2265 | mutex_unlock(®ulator->rdev->mutex); | |
2266 | ||
2267 | return ret; | |
414c70cb LG |
2268 | } |
2269 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2270 | ||
d1e7de30 MS |
2271 | /** |
2272 | * regulator_can_change_voltage - check if regulator can change voltage | |
2273 | * @regulator: regulator source | |
2274 | * | |
2275 | * Returns positive if the regulator driver backing the source/client | |
e227867f | 2276 | * can change its voltage, false otherwise. Useful for detecting fixed |
d1e7de30 MS |
2277 | * or dummy regulators and disabling voltage change logic in the client |
2278 | * driver. | |
2279 | */ | |
2280 | int regulator_can_change_voltage(struct regulator *regulator) | |
2281 | { | |
2282 | struct regulator_dev *rdev = regulator->rdev; | |
2283 | ||
2284 | if (rdev->constraints && | |
19280e40 AL |
2285 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2286 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2287 | return 1; | |
2288 | ||
2289 | if (rdev->desc->continuous_voltage_range && | |
2290 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2291 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2292 | return 1; | |
2293 | } | |
d1e7de30 MS |
2294 | |
2295 | return 0; | |
2296 | } | |
2297 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2298 | ||
4367cfdc DB |
2299 | /** |
2300 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2301 | * @regulator: regulator source | |
2302 | * | |
2303 | * Returns number of selectors, or negative errno. Selectors are | |
2304 | * numbered starting at zero, and typically correspond to bitfields | |
2305 | * in hardware registers. | |
2306 | */ | |
2307 | int regulator_count_voltages(struct regulator *regulator) | |
2308 | { | |
2309 | struct regulator_dev *rdev = regulator->rdev; | |
2310 | ||
26988efe JMC |
2311 | if (rdev->desc->n_voltages) |
2312 | return rdev->desc->n_voltages; | |
2313 | ||
2314 | if (!rdev->supply) | |
2315 | return -EINVAL; | |
2316 | ||
2317 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2318 | } |
2319 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2320 | ||
2321 | /** | |
2322 | * regulator_list_voltage - enumerate supported voltages | |
2323 | * @regulator: regulator source | |
2324 | * @selector: identify voltage to list | |
2325 | * Context: can sleep | |
2326 | * | |
2327 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2328 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2329 | * negative errno. |
2330 | */ | |
2331 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2332 | { | |
272e2315 GX |
2333 | struct regulator_dev *rdev = regulator->rdev; |
2334 | const struct regulator_ops *ops = rdev->desc->ops; | |
2335 | int ret; | |
4367cfdc | 2336 | |
f446043f GL |
2337 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) |
2338 | return rdev->desc->fixed_uV; | |
2339 | ||
26988efe JMC |
2340 | if (ops->list_voltage) { |
2341 | if (selector >= rdev->desc->n_voltages) | |
2342 | return -EINVAL; | |
2343 | mutex_lock(&rdev->mutex); | |
2344 | ret = ops->list_voltage(rdev, selector); | |
2345 | mutex_unlock(&rdev->mutex); | |
2346 | } else if (rdev->supply) { | |
2347 | ret = regulator_list_voltage(rdev->supply, selector); | |
2348 | } else { | |
4367cfdc | 2349 | return -EINVAL; |
26988efe | 2350 | } |
4367cfdc DB |
2351 | |
2352 | if (ret > 0) { | |
2353 | if (ret < rdev->constraints->min_uV) | |
2354 | ret = 0; | |
2355 | else if (ret > rdev->constraints->max_uV) | |
2356 | ret = 0; | |
2357 | } | |
2358 | ||
2359 | return ret; | |
2360 | } | |
2361 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2362 | ||
04eca28c TT |
2363 | /** |
2364 | * regulator_get_regmap - get the regulator's register map | |
2365 | * @regulator: regulator source | |
2366 | * | |
2367 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2368 | * if the regulator doesn't use regmap. | |
2369 | */ | |
2370 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2371 | { | |
2372 | struct regmap *map = regulator->rdev->regmap; | |
2373 | ||
2374 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2375 | } | |
2376 | ||
2377 | /** | |
2378 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2379 | * @regulator: regulator source | |
2380 | * @vsel_reg: voltage selector register, output parameter | |
2381 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2382 | * | |
2383 | * Returns the hardware register offset and bitmask used for setting the | |
2384 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2385 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2386 | * for example. | |
2387 | * | |
2388 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2389 | * and 0 is returned, otherwise a negative errno is returned. | |
2390 | */ | |
2391 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2392 | unsigned *vsel_reg, | |
2393 | unsigned *vsel_mask) | |
2394 | { | |
39f5460d GX |
2395 | struct regulator_dev *rdev = regulator->rdev; |
2396 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2397 | |
2398 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2399 | return -EOPNOTSUPP; | |
2400 | ||
2401 | *vsel_reg = rdev->desc->vsel_reg; | |
2402 | *vsel_mask = rdev->desc->vsel_mask; | |
2403 | ||
2404 | return 0; | |
2405 | } | |
2406 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2407 | ||
2408 | /** | |
2409 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2410 | * @regulator: regulator source | |
2411 | * @selector: identify voltage to list | |
2412 | * | |
2413 | * Converts the selector to a hardware-specific voltage selector that can be | |
2414 | * directly written to the regulator registers. The address of the voltage | |
2415 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2416 | * | |
2417 | * On error a negative errno is returned. | |
2418 | */ | |
2419 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2420 | unsigned selector) | |
2421 | { | |
39f5460d GX |
2422 | struct regulator_dev *rdev = regulator->rdev; |
2423 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2424 | |
2425 | if (selector >= rdev->desc->n_voltages) | |
2426 | return -EINVAL; | |
2427 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2428 | return -EOPNOTSUPP; | |
2429 | ||
2430 | return selector; | |
2431 | } | |
2432 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2433 | ||
2a668a8b PW |
2434 | /** |
2435 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2436 | * @regulator: regulator source | |
2437 | * | |
2438 | * Returns the voltage step size between VSEL values for linear | |
2439 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2440 | */ | |
2441 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2442 | { | |
2443 | struct regulator_dev *rdev = regulator->rdev; | |
2444 | ||
2445 | return rdev->desc->uV_step; | |
2446 | } | |
2447 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2448 | ||
a7a1ad90 MB |
2449 | /** |
2450 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2451 | * | |
2452 | * @regulator: Regulator to check. | |
2453 | * @min_uV: Minimum required voltage in uV. | |
2454 | * @max_uV: Maximum required voltage in uV. | |
2455 | * | |
2456 | * Returns a boolean or a negative error code. | |
2457 | */ | |
2458 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2459 | int min_uV, int max_uV) | |
2460 | { | |
c5f3939b | 2461 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2462 | int i, voltages, ret; |
2463 | ||
c5f3939b MB |
2464 | /* If we can't change voltage check the current voltage */ |
2465 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2466 | ret = regulator_get_voltage(regulator); | |
2467 | if (ret >= 0) | |
0d25d09d | 2468 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2469 | else |
2470 | return ret; | |
2471 | } | |
2472 | ||
bd7a2b60 PM |
2473 | /* Any voltage within constrains range is fine? */ |
2474 | if (rdev->desc->continuous_voltage_range) | |
2475 | return min_uV >= rdev->constraints->min_uV && | |
2476 | max_uV <= rdev->constraints->max_uV; | |
2477 | ||
a7a1ad90 MB |
2478 | ret = regulator_count_voltages(regulator); |
2479 | if (ret < 0) | |
2480 | return ret; | |
2481 | voltages = ret; | |
2482 | ||
2483 | for (i = 0; i < voltages; i++) { | |
2484 | ret = regulator_list_voltage(regulator, i); | |
2485 | ||
2486 | if (ret >= min_uV && ret <= max_uV) | |
2487 | return 1; | |
2488 | } | |
2489 | ||
2490 | return 0; | |
2491 | } | |
a398eaa2 | 2492 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2493 | |
7179569a HS |
2494 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2495 | int min_uV, int max_uV, | |
2496 | unsigned *selector) | |
2497 | { | |
2498 | struct pre_voltage_change_data data; | |
2499 | int ret; | |
2500 | ||
2501 | data.old_uV = _regulator_get_voltage(rdev); | |
2502 | data.min_uV = min_uV; | |
2503 | data.max_uV = max_uV; | |
2504 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2505 | &data); | |
2506 | if (ret & NOTIFY_STOP_MASK) | |
2507 | return -EINVAL; | |
2508 | ||
2509 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2510 | if (ret >= 0) | |
2511 | return ret; | |
2512 | ||
2513 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2514 | (void *)data.old_uV); | |
2515 | ||
2516 | return ret; | |
2517 | } | |
2518 | ||
2519 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2520 | int uV, unsigned selector) | |
2521 | { | |
2522 | struct pre_voltage_change_data data; | |
2523 | int ret; | |
2524 | ||
2525 | data.old_uV = _regulator_get_voltage(rdev); | |
2526 | data.min_uV = uV; | |
2527 | data.max_uV = uV; | |
2528 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2529 | &data); | |
2530 | if (ret & NOTIFY_STOP_MASK) | |
2531 | return -EINVAL; | |
2532 | ||
2533 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2534 | if (ret >= 0) | |
2535 | return ret; | |
2536 | ||
2537 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2538 | (void *)data.old_uV); | |
2539 | ||
2540 | return ret; | |
2541 | } | |
2542 | ||
75790251 MB |
2543 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2544 | int min_uV, int max_uV) | |
2545 | { | |
2546 | int ret; | |
77af1b26 | 2547 | int delay = 0; |
e113d792 | 2548 | int best_val = 0; |
75790251 | 2549 | unsigned int selector; |
eba41a5e | 2550 | int old_selector = -1; |
75790251 MB |
2551 | |
2552 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2553 | ||
bf5892a8 MB |
2554 | min_uV += rdev->constraints->uV_offset; |
2555 | max_uV += rdev->constraints->uV_offset; | |
2556 | ||
eba41a5e AL |
2557 | /* |
2558 | * If we can't obtain the old selector there is not enough | |
2559 | * info to call set_voltage_time_sel(). | |
2560 | */ | |
8b7485ef AL |
2561 | if (_regulator_is_enabled(rdev) && |
2562 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2563 | rdev->desc->ops->get_voltage_sel) { |
2564 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2565 | if (old_selector < 0) | |
2566 | return old_selector; | |
2567 | } | |
2568 | ||
75790251 | 2569 | if (rdev->desc->ops->set_voltage) { |
7179569a HS |
2570 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2571 | &selector); | |
e113d792 MB |
2572 | |
2573 | if (ret >= 0) { | |
2574 | if (rdev->desc->ops->list_voltage) | |
2575 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2576 | selector); | |
2577 | else | |
2578 | best_val = _regulator_get_voltage(rdev); | |
2579 | } | |
2580 | ||
e8eef82b | 2581 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2582 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2583 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2584 | max_uV); | |
9152c36a AL |
2585 | } else { |
2586 | if (rdev->desc->ops->list_voltage == | |
2587 | regulator_list_voltage_linear) | |
2588 | ret = regulator_map_voltage_linear(rdev, | |
2589 | min_uV, max_uV); | |
36698627 AL |
2590 | else if (rdev->desc->ops->list_voltage == |
2591 | regulator_list_voltage_linear_range) | |
2592 | ret = regulator_map_voltage_linear_range(rdev, | |
2593 | min_uV, max_uV); | |
9152c36a AL |
2594 | else |
2595 | ret = regulator_map_voltage_iterate(rdev, | |
2596 | min_uV, max_uV); | |
2597 | } | |
e8eef82b | 2598 | |
e843fc46 | 2599 | if (ret >= 0) { |
e113d792 MB |
2600 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2601 | if (min_uV <= best_val && max_uV >= best_val) { | |
2602 | selector = ret; | |
c66a566a AL |
2603 | if (old_selector == selector) |
2604 | ret = 0; | |
2605 | else | |
7179569a HS |
2606 | ret = _regulator_call_set_voltage_sel( |
2607 | rdev, best_val, selector); | |
e113d792 MB |
2608 | } else { |
2609 | ret = -EINVAL; | |
2610 | } | |
e8eef82b | 2611 | } |
75790251 MB |
2612 | } else { |
2613 | ret = -EINVAL; | |
2614 | } | |
e8eef82b | 2615 | |
eba41a5e | 2616 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2617 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2618 | && old_selector != selector) { | |
77af1b26 | 2619 | |
eba41a5e AL |
2620 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2621 | old_selector, selector); | |
2622 | if (delay < 0) { | |
2623 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2624 | delay); | |
2625 | delay = 0; | |
e8eef82b | 2626 | } |
75790251 | 2627 | |
8b96de31 PR |
2628 | /* Insert any necessary delays */ |
2629 | if (delay >= 1000) { | |
2630 | mdelay(delay / 1000); | |
2631 | udelay(delay % 1000); | |
2632 | } else if (delay) { | |
2633 | udelay(delay); | |
2634 | } | |
77af1b26 LW |
2635 | } |
2636 | ||
2f6c797f AL |
2637 | if (ret == 0 && best_val >= 0) { |
2638 | unsigned long data = best_val; | |
2639 | ||
ded06a52 | 2640 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2641 | (void *)data); |
2642 | } | |
ded06a52 | 2643 | |
eba41a5e | 2644 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2645 | |
2646 | return ret; | |
2647 | } | |
2648 | ||
414c70cb LG |
2649 | /** |
2650 | * regulator_set_voltage - set regulator output voltage | |
2651 | * @regulator: regulator source | |
2652 | * @min_uV: Minimum required voltage in uV | |
2653 | * @max_uV: Maximum acceptable voltage in uV | |
2654 | * | |
2655 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2656 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2657 | * | |
2658 | * If the regulator is enabled then the voltage will change to the new value | |
2659 | * immediately otherwise if the regulator is disabled the regulator will | |
2660 | * output at the new voltage when enabled. | |
2661 | * | |
2662 | * NOTE: If the regulator is shared between several devices then the lowest | |
2663 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2664 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2665 | * calling this function otherwise this call will fail. |
2666 | */ | |
2667 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2668 | { | |
2669 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2670 | int ret = 0; |
92d7a558 | 2671 | int old_min_uV, old_max_uV; |
c00dc359 | 2672 | int current_uV; |
414c70cb LG |
2673 | |
2674 | mutex_lock(&rdev->mutex); | |
2675 | ||
95a3c23a MB |
2676 | /* If we're setting the same range as last time the change |
2677 | * should be a noop (some cpufreq implementations use the same | |
2678 | * voltage for multiple frequencies, for example). | |
2679 | */ | |
2680 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2681 | goto out; | |
2682 | ||
c00dc359 BA |
2683 | /* If we're trying to set a range that overlaps the current voltage, |
2684 | * return succesfully even though the regulator does not support | |
2685 | * changing the voltage. | |
2686 | */ | |
2687 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2688 | current_uV = _regulator_get_voltage(rdev); | |
2689 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
2690 | regulator->min_uV = min_uV; | |
2691 | regulator->max_uV = max_uV; | |
2692 | goto out; | |
2693 | } | |
2694 | } | |
2695 | ||
414c70cb | 2696 | /* sanity check */ |
e8eef82b MB |
2697 | if (!rdev->desc->ops->set_voltage && |
2698 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2699 | ret = -EINVAL; |
2700 | goto out; | |
2701 | } | |
2702 | ||
2703 | /* constraints check */ | |
2704 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2705 | if (ret < 0) | |
2706 | goto out; | |
0d25d09d | 2707 | |
92d7a558 PP |
2708 | /* restore original values in case of error */ |
2709 | old_min_uV = regulator->min_uV; | |
2710 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2711 | regulator->min_uV = min_uV; |
2712 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2713 | |
05fda3b1 TP |
2714 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2715 | if (ret < 0) | |
92d7a558 | 2716 | goto out2; |
05fda3b1 | 2717 | |
75790251 | 2718 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2719 | if (ret < 0) |
2720 | goto out2; | |
0d25d09d | 2721 | |
414c70cb LG |
2722 | out: |
2723 | mutex_unlock(&rdev->mutex); | |
2724 | return ret; | |
92d7a558 PP |
2725 | out2: |
2726 | regulator->min_uV = old_min_uV; | |
2727 | regulator->max_uV = old_max_uV; | |
2728 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2729 | return ret; |
2730 | } | |
2731 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2732 | ||
88cd222b LW |
2733 | /** |
2734 | * regulator_set_voltage_time - get raise/fall time | |
2735 | * @regulator: regulator source | |
2736 | * @old_uV: starting voltage in microvolts | |
2737 | * @new_uV: target voltage in microvolts | |
2738 | * | |
2739 | * Provided with the starting and ending voltage, this function attempts to | |
2740 | * calculate the time in microseconds required to rise or fall to this new | |
2741 | * voltage. | |
2742 | */ | |
2743 | int regulator_set_voltage_time(struct regulator *regulator, | |
2744 | int old_uV, int new_uV) | |
2745 | { | |
272e2315 GX |
2746 | struct regulator_dev *rdev = regulator->rdev; |
2747 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
2748 | int old_sel = -1; |
2749 | int new_sel = -1; | |
2750 | int voltage; | |
2751 | int i; | |
2752 | ||
2753 | /* Currently requires operations to do this */ | |
2754 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2755 | || !rdev->desc->n_voltages) | |
2756 | return -EINVAL; | |
2757 | ||
2758 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2759 | /* We only look for exact voltage matches here */ | |
2760 | voltage = regulator_list_voltage(regulator, i); | |
2761 | if (voltage < 0) | |
2762 | return -EINVAL; | |
2763 | if (voltage == 0) | |
2764 | continue; | |
2765 | if (voltage == old_uV) | |
2766 | old_sel = i; | |
2767 | if (voltage == new_uV) | |
2768 | new_sel = i; | |
2769 | } | |
2770 | ||
2771 | if (old_sel < 0 || new_sel < 0) | |
2772 | return -EINVAL; | |
2773 | ||
2774 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2775 | } | |
2776 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2777 | ||
98a175b6 | 2778 | /** |
296c6566 RD |
2779 | * regulator_set_voltage_time_sel - get raise/fall time |
2780 | * @rdev: regulator source device | |
98a175b6 YSB |
2781 | * @old_selector: selector for starting voltage |
2782 | * @new_selector: selector for target voltage | |
2783 | * | |
2784 | * Provided with the starting and target voltage selectors, this function | |
2785 | * returns time in microseconds required to rise or fall to this new voltage | |
2786 | * | |
f11d08c3 | 2787 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2788 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2789 | */ |
2790 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2791 | unsigned int old_selector, | |
2792 | unsigned int new_selector) | |
2793 | { | |
398715ab | 2794 | unsigned int ramp_delay = 0; |
f11d08c3 | 2795 | int old_volt, new_volt; |
398715ab AL |
2796 | |
2797 | if (rdev->constraints->ramp_delay) | |
2798 | ramp_delay = rdev->constraints->ramp_delay; | |
2799 | else if (rdev->desc->ramp_delay) | |
2800 | ramp_delay = rdev->desc->ramp_delay; | |
2801 | ||
2802 | if (ramp_delay == 0) { | |
6f0b2c69 | 2803 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2804 | return 0; |
6f0b2c69 | 2805 | } |
398715ab | 2806 | |
f11d08c3 AL |
2807 | /* sanity check */ |
2808 | if (!rdev->desc->ops->list_voltage) | |
2809 | return -EINVAL; | |
398715ab | 2810 | |
f11d08c3 AL |
2811 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2812 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2813 | ||
2814 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2815 | } |
b19dbf71 | 2816 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2817 | |
606a2562 MB |
2818 | /** |
2819 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2820 | * @regulator: regulator source | |
2821 | * | |
2822 | * Re-apply the last configured voltage. This is intended to be used | |
2823 | * where some external control source the consumer is cooperating with | |
2824 | * has caused the configured voltage to change. | |
2825 | */ | |
2826 | int regulator_sync_voltage(struct regulator *regulator) | |
2827 | { | |
2828 | struct regulator_dev *rdev = regulator->rdev; | |
2829 | int ret, min_uV, max_uV; | |
2830 | ||
2831 | mutex_lock(&rdev->mutex); | |
2832 | ||
2833 | if (!rdev->desc->ops->set_voltage && | |
2834 | !rdev->desc->ops->set_voltage_sel) { | |
2835 | ret = -EINVAL; | |
2836 | goto out; | |
2837 | } | |
2838 | ||
2839 | /* This is only going to work if we've had a voltage configured. */ | |
2840 | if (!regulator->min_uV && !regulator->max_uV) { | |
2841 | ret = -EINVAL; | |
2842 | goto out; | |
2843 | } | |
2844 | ||
2845 | min_uV = regulator->min_uV; | |
2846 | max_uV = regulator->max_uV; | |
2847 | ||
2848 | /* This should be a paranoia check... */ | |
2849 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2850 | if (ret < 0) | |
2851 | goto out; | |
2852 | ||
2853 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2854 | if (ret < 0) | |
2855 | goto out; | |
2856 | ||
2857 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2858 | ||
2859 | out: | |
2860 | mutex_unlock(&rdev->mutex); | |
2861 | return ret; | |
2862 | } | |
2863 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2864 | ||
414c70cb LG |
2865 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2866 | { | |
bf5892a8 | 2867 | int sel, ret; |
476c2d83 MB |
2868 | |
2869 | if (rdev->desc->ops->get_voltage_sel) { | |
2870 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2871 | if (sel < 0) | |
2872 | return sel; | |
bf5892a8 | 2873 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2874 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2875 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2876 | } else if (rdev->desc->ops->list_voltage) { |
2877 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
2878 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
2879 | ret = rdev->desc->fixed_uV; | |
e303996e JMC |
2880 | } else if (rdev->supply) { |
2881 | ret = regulator_get_voltage(rdev->supply); | |
cb220d16 | 2882 | } else { |
414c70cb | 2883 | return -EINVAL; |
cb220d16 | 2884 | } |
bf5892a8 | 2885 | |
cb220d16 AL |
2886 | if (ret < 0) |
2887 | return ret; | |
bf5892a8 | 2888 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2889 | } |
2890 | ||
2891 | /** | |
2892 | * regulator_get_voltage - get regulator output voltage | |
2893 | * @regulator: regulator source | |
2894 | * | |
2895 | * This returns the current regulator voltage in uV. | |
2896 | * | |
2897 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2898 | * function should not be used to determine regulator state. | |
2899 | */ | |
2900 | int regulator_get_voltage(struct regulator *regulator) | |
2901 | { | |
2902 | int ret; | |
2903 | ||
2904 | mutex_lock(®ulator->rdev->mutex); | |
2905 | ||
2906 | ret = _regulator_get_voltage(regulator->rdev); | |
2907 | ||
2908 | mutex_unlock(®ulator->rdev->mutex); | |
2909 | ||
2910 | return ret; | |
2911 | } | |
2912 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2913 | ||
2914 | /** | |
2915 | * regulator_set_current_limit - set regulator output current limit | |
2916 | * @regulator: regulator source | |
ce0d10f8 | 2917 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2918 | * @max_uA: Maximum supported current in uA |
2919 | * | |
2920 | * Sets current sink to the desired output current. This can be set during | |
2921 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2922 | * | |
2923 | * If the regulator is enabled then the current will change to the new value | |
2924 | * immediately otherwise if the regulator is disabled the regulator will | |
2925 | * output at the new current when enabled. | |
2926 | * | |
2927 | * NOTE: Regulator system constraints must be set for this regulator before | |
2928 | * calling this function otherwise this call will fail. | |
2929 | */ | |
2930 | int regulator_set_current_limit(struct regulator *regulator, | |
2931 | int min_uA, int max_uA) | |
2932 | { | |
2933 | struct regulator_dev *rdev = regulator->rdev; | |
2934 | int ret; | |
2935 | ||
2936 | mutex_lock(&rdev->mutex); | |
2937 | ||
2938 | /* sanity check */ | |
2939 | if (!rdev->desc->ops->set_current_limit) { | |
2940 | ret = -EINVAL; | |
2941 | goto out; | |
2942 | } | |
2943 | ||
2944 | /* constraints check */ | |
2945 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2946 | if (ret < 0) | |
2947 | goto out; | |
2948 | ||
2949 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2950 | out: | |
2951 | mutex_unlock(&rdev->mutex); | |
2952 | return ret; | |
2953 | } | |
2954 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2955 | ||
2956 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2957 | { | |
2958 | int ret; | |
2959 | ||
2960 | mutex_lock(&rdev->mutex); | |
2961 | ||
2962 | /* sanity check */ | |
2963 | if (!rdev->desc->ops->get_current_limit) { | |
2964 | ret = -EINVAL; | |
2965 | goto out; | |
2966 | } | |
2967 | ||
2968 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2969 | out: | |
2970 | mutex_unlock(&rdev->mutex); | |
2971 | return ret; | |
2972 | } | |
2973 | ||
2974 | /** | |
2975 | * regulator_get_current_limit - get regulator output current | |
2976 | * @regulator: regulator source | |
2977 | * | |
2978 | * This returns the current supplied by the specified current sink in uA. | |
2979 | * | |
2980 | * NOTE: If the regulator is disabled it will return the current value. This | |
2981 | * function should not be used to determine regulator state. | |
2982 | */ | |
2983 | int regulator_get_current_limit(struct regulator *regulator) | |
2984 | { | |
2985 | return _regulator_get_current_limit(regulator->rdev); | |
2986 | } | |
2987 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2988 | ||
2989 | /** | |
2990 | * regulator_set_mode - set regulator operating mode | |
2991 | * @regulator: regulator source | |
2992 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2993 | * | |
2994 | * Set regulator operating mode to increase regulator efficiency or improve | |
2995 | * regulation performance. | |
2996 | * | |
2997 | * NOTE: Regulator system constraints must be set for this regulator before | |
2998 | * calling this function otherwise this call will fail. | |
2999 | */ | |
3000 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
3001 | { | |
3002 | struct regulator_dev *rdev = regulator->rdev; | |
3003 | int ret; | |
500b4ac9 | 3004 | int regulator_curr_mode; |
414c70cb LG |
3005 | |
3006 | mutex_lock(&rdev->mutex); | |
3007 | ||
3008 | /* sanity check */ | |
3009 | if (!rdev->desc->ops->set_mode) { | |
3010 | ret = -EINVAL; | |
3011 | goto out; | |
3012 | } | |
3013 | ||
500b4ac9 SI |
3014 | /* return if the same mode is requested */ |
3015 | if (rdev->desc->ops->get_mode) { | |
3016 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3017 | if (regulator_curr_mode == mode) { | |
3018 | ret = 0; | |
3019 | goto out; | |
3020 | } | |
3021 | } | |
3022 | ||
414c70cb | 3023 | /* constraints check */ |
22c51b47 | 3024 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3025 | if (ret < 0) |
3026 | goto out; | |
3027 | ||
3028 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3029 | out: | |
3030 | mutex_unlock(&rdev->mutex); | |
3031 | return ret; | |
3032 | } | |
3033 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3034 | ||
3035 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
3036 | { | |
3037 | int ret; | |
3038 | ||
3039 | mutex_lock(&rdev->mutex); | |
3040 | ||
3041 | /* sanity check */ | |
3042 | if (!rdev->desc->ops->get_mode) { | |
3043 | ret = -EINVAL; | |
3044 | goto out; | |
3045 | } | |
3046 | ||
3047 | ret = rdev->desc->ops->get_mode(rdev); | |
3048 | out: | |
3049 | mutex_unlock(&rdev->mutex); | |
3050 | return ret; | |
3051 | } | |
3052 | ||
3053 | /** | |
3054 | * regulator_get_mode - get regulator operating mode | |
3055 | * @regulator: regulator source | |
3056 | * | |
3057 | * Get the current regulator operating mode. | |
3058 | */ | |
3059 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3060 | { | |
3061 | return _regulator_get_mode(regulator->rdev); | |
3062 | } | |
3063 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3064 | ||
3065 | /** | |
e39ce48f | 3066 | * regulator_set_load - set regulator load |
414c70cb LG |
3067 | * @regulator: regulator source |
3068 | * @uA_load: load current | |
3069 | * | |
3070 | * Notifies the regulator core of a new device load. This is then used by | |
3071 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3072 | * operating mode for the new regulator loading. | |
3073 | * | |
3074 | * Consumer devices notify their supply regulator of the maximum power | |
3075 | * they will require (can be taken from device datasheet in the power | |
3076 | * consumption tables) when they change operational status and hence power | |
3077 | * state. Examples of operational state changes that can affect power | |
3078 | * consumption are :- | |
3079 | * | |
3080 | * o Device is opened / closed. | |
3081 | * o Device I/O is about to begin or has just finished. | |
3082 | * o Device is idling in between work. | |
3083 | * | |
3084 | * This information is also exported via sysfs to userspace. | |
3085 | * | |
3086 | * DRMS will sum the total requested load on the regulator and change | |
3087 | * to the most efficient operating mode if platform constraints allow. | |
3088 | * | |
e39ce48f | 3089 | * On error a negative errno is returned. |
414c70cb | 3090 | */ |
e39ce48f | 3091 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3092 | { |
3093 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3094 | int ret; |
d92d95b6 | 3095 | |
414c70cb | 3096 | mutex_lock(&rdev->mutex); |
414c70cb | 3097 | regulator->uA_load = uA_load; |
8460ef38 | 3098 | ret = drms_uA_update(rdev); |
414c70cb | 3099 | mutex_unlock(&rdev->mutex); |
8460ef38 | 3100 | |
414c70cb LG |
3101 | return ret; |
3102 | } | |
e39ce48f | 3103 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 3104 | |
f59c8f9f MB |
3105 | /** |
3106 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3107 | * | |
3108 | * @regulator: Regulator to configure | |
9345dfb8 | 3109 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3110 | * |
3111 | * Allow the regulator to go into bypass mode if all other consumers | |
3112 | * for the regulator also enable bypass mode and the machine | |
3113 | * constraints allow this. Bypass mode means that the regulator is | |
3114 | * simply passing the input directly to the output with no regulation. | |
3115 | */ | |
3116 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3117 | { | |
3118 | struct regulator_dev *rdev = regulator->rdev; | |
3119 | int ret = 0; | |
3120 | ||
3121 | if (!rdev->desc->ops->set_bypass) | |
3122 | return 0; | |
3123 | ||
3124 | if (rdev->constraints && | |
3125 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
3126 | return 0; | |
3127 | ||
3128 | mutex_lock(&rdev->mutex); | |
3129 | ||
3130 | if (enable && !regulator->bypass) { | |
3131 | rdev->bypass_count++; | |
3132 | ||
3133 | if (rdev->bypass_count == rdev->open_count) { | |
3134 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3135 | if (ret != 0) | |
3136 | rdev->bypass_count--; | |
3137 | } | |
3138 | ||
3139 | } else if (!enable && regulator->bypass) { | |
3140 | rdev->bypass_count--; | |
3141 | ||
3142 | if (rdev->bypass_count != rdev->open_count) { | |
3143 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3144 | if (ret != 0) | |
3145 | rdev->bypass_count++; | |
3146 | } | |
3147 | } | |
3148 | ||
3149 | if (ret == 0) | |
3150 | regulator->bypass = enable; | |
3151 | ||
3152 | mutex_unlock(&rdev->mutex); | |
3153 | ||
3154 | return ret; | |
3155 | } | |
3156 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3157 | ||
414c70cb LG |
3158 | /** |
3159 | * regulator_register_notifier - register regulator event notifier | |
3160 | * @regulator: regulator source | |
69279fb9 | 3161 | * @nb: notifier block |
414c70cb LG |
3162 | * |
3163 | * Register notifier block to receive regulator events. | |
3164 | */ | |
3165 | int regulator_register_notifier(struct regulator *regulator, | |
3166 | struct notifier_block *nb) | |
3167 | { | |
3168 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3169 | nb); | |
3170 | } | |
3171 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3172 | ||
3173 | /** | |
3174 | * regulator_unregister_notifier - unregister regulator event notifier | |
3175 | * @regulator: regulator source | |
69279fb9 | 3176 | * @nb: notifier block |
414c70cb LG |
3177 | * |
3178 | * Unregister regulator event notifier block. | |
3179 | */ | |
3180 | int regulator_unregister_notifier(struct regulator *regulator, | |
3181 | struct notifier_block *nb) | |
3182 | { | |
3183 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3184 | nb); | |
3185 | } | |
3186 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3187 | ||
b136fb44 JC |
3188 | /* notify regulator consumers and downstream regulator consumers. |
3189 | * Note mutex must be held by caller. | |
3190 | */ | |
7179569a | 3191 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3192 | unsigned long event, void *data) |
3193 | { | |
414c70cb | 3194 | /* call rdev chain first */ |
7179569a | 3195 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3196 | } |
3197 | ||
3198 | /** | |
3199 | * regulator_bulk_get - get multiple regulator consumers | |
3200 | * | |
3201 | * @dev: Device to supply | |
3202 | * @num_consumers: Number of consumers to register | |
3203 | * @consumers: Configuration of consumers; clients are stored here. | |
3204 | * | |
3205 | * @return 0 on success, an errno on failure. | |
3206 | * | |
3207 | * This helper function allows drivers to get several regulator | |
3208 | * consumers in one operation. If any of the regulators cannot be | |
3209 | * acquired then any regulators that were allocated will be freed | |
3210 | * before returning to the caller. | |
3211 | */ | |
3212 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3213 | struct regulator_bulk_data *consumers) | |
3214 | { | |
3215 | int i; | |
3216 | int ret; | |
3217 | ||
3218 | for (i = 0; i < num_consumers; i++) | |
3219 | consumers[i].consumer = NULL; | |
3220 | ||
3221 | for (i = 0; i < num_consumers; i++) { | |
3222 | consumers[i].consumer = regulator_get(dev, | |
3223 | consumers[i].supply); | |
3224 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 3225 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3226 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3227 | consumers[i].supply, ret); | |
414c70cb LG |
3228 | consumers[i].consumer = NULL; |
3229 | goto err; | |
3230 | } | |
3231 | } | |
3232 | ||
3233 | return 0; | |
3234 | ||
3235 | err: | |
b29c7690 | 3236 | while (--i >= 0) |
414c70cb LG |
3237 | regulator_put(consumers[i].consumer); |
3238 | ||
3239 | return ret; | |
3240 | } | |
3241 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3242 | ||
f21e0e81 MB |
3243 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3244 | { | |
3245 | struct regulator_bulk_data *bulk = data; | |
3246 | ||
3247 | bulk->ret = regulator_enable(bulk->consumer); | |
3248 | } | |
3249 | ||
414c70cb LG |
3250 | /** |
3251 | * regulator_bulk_enable - enable multiple regulator consumers | |
3252 | * | |
3253 | * @num_consumers: Number of consumers | |
3254 | * @consumers: Consumer data; clients are stored here. | |
3255 | * @return 0 on success, an errno on failure | |
3256 | * | |
3257 | * This convenience API allows consumers to enable multiple regulator | |
3258 | * clients in a single API call. If any consumers cannot be enabled | |
3259 | * then any others that were enabled will be disabled again prior to | |
3260 | * return. | |
3261 | */ | |
3262 | int regulator_bulk_enable(int num_consumers, | |
3263 | struct regulator_bulk_data *consumers) | |
3264 | { | |
2955b47d | 3265 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3266 | int i; |
f21e0e81 | 3267 | int ret = 0; |
414c70cb | 3268 | |
6492bc1b MB |
3269 | for (i = 0; i < num_consumers; i++) { |
3270 | if (consumers[i].consumer->always_on) | |
3271 | consumers[i].ret = 0; | |
3272 | else | |
3273 | async_schedule_domain(regulator_bulk_enable_async, | |
3274 | &consumers[i], &async_domain); | |
3275 | } | |
f21e0e81 MB |
3276 | |
3277 | async_synchronize_full_domain(&async_domain); | |
3278 | ||
3279 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3280 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3281 | if (consumers[i].ret != 0) { |
3282 | ret = consumers[i].ret; | |
414c70cb | 3283 | goto err; |
f21e0e81 | 3284 | } |
414c70cb LG |
3285 | } |
3286 | ||
3287 | return 0; | |
3288 | ||
3289 | err: | |
fbe31057 AH |
3290 | for (i = 0; i < num_consumers; i++) { |
3291 | if (consumers[i].ret < 0) | |
3292 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3293 | consumers[i].ret); | |
3294 | else | |
3295 | regulator_disable(consumers[i].consumer); | |
3296 | } | |
414c70cb LG |
3297 | |
3298 | return ret; | |
3299 | } | |
3300 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3301 | ||
3302 | /** | |
3303 | * regulator_bulk_disable - disable multiple regulator consumers | |
3304 | * | |
3305 | * @num_consumers: Number of consumers | |
3306 | * @consumers: Consumer data; clients are stored here. | |
3307 | * @return 0 on success, an errno on failure | |
3308 | * | |
3309 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3310 | * clients in a single API call. If any consumers cannot be disabled |
3311 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3312 | * return. |
3313 | */ | |
3314 | int regulator_bulk_disable(int num_consumers, | |
3315 | struct regulator_bulk_data *consumers) | |
3316 | { | |
3317 | int i; | |
01e86f49 | 3318 | int ret, r; |
414c70cb | 3319 | |
49e22632 | 3320 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3321 | ret = regulator_disable(consumers[i].consumer); |
3322 | if (ret != 0) | |
3323 | goto err; | |
3324 | } | |
3325 | ||
3326 | return 0; | |
3327 | ||
3328 | err: | |
5da84fd9 | 3329 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3330 | for (++i; i < num_consumers; ++i) { |
3331 | r = regulator_enable(consumers[i].consumer); | |
3332 | if (r != 0) | |
3333 | pr_err("Failed to reename %s: %d\n", | |
3334 | consumers[i].supply, r); | |
3335 | } | |
414c70cb LG |
3336 | |
3337 | return ret; | |
3338 | } | |
3339 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3340 | ||
e1de2f42 DK |
3341 | /** |
3342 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3343 | * | |
3344 | * @num_consumers: Number of consumers | |
3345 | * @consumers: Consumer data; clients are stored here. | |
3346 | * @return 0 on success, an errno on failure | |
3347 | * | |
3348 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3349 | * clients in a single API call. | |
3350 | * NOTE: This should be used for situations when device damage will | |
3351 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3352 | * Although regulator_force_disable function call for some consumers can | |
3353 | * return error numbers, the function is called for all consumers. | |
3354 | */ | |
3355 | int regulator_bulk_force_disable(int num_consumers, | |
3356 | struct regulator_bulk_data *consumers) | |
3357 | { | |
3358 | int i; | |
3359 | int ret; | |
3360 | ||
3361 | for (i = 0; i < num_consumers; i++) | |
3362 | consumers[i].ret = | |
3363 | regulator_force_disable(consumers[i].consumer); | |
3364 | ||
3365 | for (i = 0; i < num_consumers; i++) { | |
3366 | if (consumers[i].ret != 0) { | |
3367 | ret = consumers[i].ret; | |
3368 | goto out; | |
3369 | } | |
3370 | } | |
3371 | ||
3372 | return 0; | |
3373 | out: | |
3374 | return ret; | |
3375 | } | |
3376 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3377 | ||
414c70cb LG |
3378 | /** |
3379 | * regulator_bulk_free - free multiple regulator consumers | |
3380 | * | |
3381 | * @num_consumers: Number of consumers | |
3382 | * @consumers: Consumer data; clients are stored here. | |
3383 | * | |
3384 | * This convenience API allows consumers to free multiple regulator | |
3385 | * clients in a single API call. | |
3386 | */ | |
3387 | void regulator_bulk_free(int num_consumers, | |
3388 | struct regulator_bulk_data *consumers) | |
3389 | { | |
3390 | int i; | |
3391 | ||
3392 | for (i = 0; i < num_consumers; i++) { | |
3393 | regulator_put(consumers[i].consumer); | |
3394 | consumers[i].consumer = NULL; | |
3395 | } | |
3396 | } | |
3397 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3398 | ||
3399 | /** | |
3400 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3401 | * @rdev: regulator source |
414c70cb | 3402 | * @event: notifier block |
69279fb9 | 3403 | * @data: callback-specific data. |
414c70cb LG |
3404 | * |
3405 | * Called by regulator drivers to notify clients a regulator event has | |
3406 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3407 | * Note lock must be held by caller. |
414c70cb LG |
3408 | */ |
3409 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3410 | unsigned long event, void *data) | |
3411 | { | |
3412 | _notifier_call_chain(rdev, event, data); | |
3413 | return NOTIFY_DONE; | |
3414 | ||
3415 | } | |
3416 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3417 | ||
be721979 MB |
3418 | /** |
3419 | * regulator_mode_to_status - convert a regulator mode into a status | |
3420 | * | |
3421 | * @mode: Mode to convert | |
3422 | * | |
3423 | * Convert a regulator mode into a status. | |
3424 | */ | |
3425 | int regulator_mode_to_status(unsigned int mode) | |
3426 | { | |
3427 | switch (mode) { | |
3428 | case REGULATOR_MODE_FAST: | |
3429 | return REGULATOR_STATUS_FAST; | |
3430 | case REGULATOR_MODE_NORMAL: | |
3431 | return REGULATOR_STATUS_NORMAL; | |
3432 | case REGULATOR_MODE_IDLE: | |
3433 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3434 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3435 | return REGULATOR_STATUS_STANDBY; |
3436 | default: | |
1beaf762 | 3437 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3438 | } |
3439 | } | |
3440 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3441 | ||
39f802d6 TI |
3442 | static struct attribute *regulator_dev_attrs[] = { |
3443 | &dev_attr_name.attr, | |
3444 | &dev_attr_num_users.attr, | |
3445 | &dev_attr_type.attr, | |
3446 | &dev_attr_microvolts.attr, | |
3447 | &dev_attr_microamps.attr, | |
3448 | &dev_attr_opmode.attr, | |
3449 | &dev_attr_state.attr, | |
3450 | &dev_attr_status.attr, | |
3451 | &dev_attr_bypass.attr, | |
3452 | &dev_attr_requested_microamps.attr, | |
3453 | &dev_attr_min_microvolts.attr, | |
3454 | &dev_attr_max_microvolts.attr, | |
3455 | &dev_attr_min_microamps.attr, | |
3456 | &dev_attr_max_microamps.attr, | |
3457 | &dev_attr_suspend_standby_state.attr, | |
3458 | &dev_attr_suspend_mem_state.attr, | |
3459 | &dev_attr_suspend_disk_state.attr, | |
3460 | &dev_attr_suspend_standby_microvolts.attr, | |
3461 | &dev_attr_suspend_mem_microvolts.attr, | |
3462 | &dev_attr_suspend_disk_microvolts.attr, | |
3463 | &dev_attr_suspend_standby_mode.attr, | |
3464 | &dev_attr_suspend_mem_mode.attr, | |
3465 | &dev_attr_suspend_disk_mode.attr, | |
3466 | NULL | |
3467 | }; | |
3468 | ||
7ad68e2f DB |
3469 | /* |
3470 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3471 | * create attributes that can be meaningfully displayed. | |
3472 | */ | |
39f802d6 TI |
3473 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
3474 | struct attribute *attr, int idx) | |
7ad68e2f | 3475 | { |
39f802d6 TI |
3476 | struct device *dev = kobj_to_dev(kobj); |
3477 | struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev); | |
272e2315 | 3478 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
3479 | umode_t mode = attr->mode; |
3480 | ||
3481 | /* these three are always present */ | |
3482 | if (attr == &dev_attr_name.attr || | |
3483 | attr == &dev_attr_num_users.attr || | |
3484 | attr == &dev_attr_type.attr) | |
3485 | return mode; | |
7ad68e2f DB |
3486 | |
3487 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
3488 | if (attr == &dev_attr_microvolts.attr) { |
3489 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
3490 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
3491 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
3492 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
3493 | return mode; | |
3494 | return 0; | |
f59c8f9f | 3495 | } |
7ad68e2f | 3496 | |
39f802d6 TI |
3497 | if (attr == &dev_attr_microamps.attr) |
3498 | return ops->get_current_limit ? mode : 0; | |
3499 | ||
3500 | if (attr == &dev_attr_opmode.attr) | |
3501 | return ops->get_mode ? mode : 0; | |
3502 | ||
3503 | if (attr == &dev_attr_state.attr) | |
3504 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
3505 | ||
3506 | if (attr == &dev_attr_status.attr) | |
3507 | return ops->get_status ? mode : 0; | |
3508 | ||
3509 | if (attr == &dev_attr_bypass.attr) | |
3510 | return ops->get_bypass ? mode : 0; | |
3511 | ||
7ad68e2f | 3512 | /* some attributes are type-specific */ |
39f802d6 TI |
3513 | if (attr == &dev_attr_requested_microamps.attr) |
3514 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 3515 | |
7ad68e2f | 3516 | /* constraints need specific supporting methods */ |
39f802d6 TI |
3517 | if (attr == &dev_attr_min_microvolts.attr || |
3518 | attr == &dev_attr_max_microvolts.attr) | |
3519 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
3520 | ||
3521 | if (attr == &dev_attr_min_microamps.attr || | |
3522 | attr == &dev_attr_max_microamps.attr) | |
3523 | return ops->set_current_limit ? mode : 0; | |
3524 | ||
3525 | if (attr == &dev_attr_suspend_standby_state.attr || | |
3526 | attr == &dev_attr_suspend_mem_state.attr || | |
3527 | attr == &dev_attr_suspend_disk_state.attr) | |
3528 | return mode; | |
3529 | ||
3530 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
3531 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
3532 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
3533 | return ops->set_suspend_voltage ? mode : 0; | |
3534 | ||
3535 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
3536 | attr == &dev_attr_suspend_mem_mode.attr || | |
3537 | attr == &dev_attr_suspend_disk_mode.attr) | |
3538 | return ops->set_suspend_mode ? mode : 0; | |
3539 | ||
3540 | return mode; | |
3541 | } | |
3542 | ||
3543 | static const struct attribute_group regulator_dev_group = { | |
3544 | .attrs = regulator_dev_attrs, | |
3545 | .is_visible = regulator_attr_is_visible, | |
3546 | }; | |
3547 | ||
3548 | static const struct attribute_group *regulator_dev_groups[] = { | |
3549 | ®ulator_dev_group, | |
3550 | NULL | |
3551 | }; | |
7ad68e2f | 3552 | |
39f802d6 TI |
3553 | static void regulator_dev_release(struct device *dev) |
3554 | { | |
3555 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
3556 | kfree(rdev); | |
7ad68e2f DB |
3557 | } |
3558 | ||
39f802d6 TI |
3559 | static struct class regulator_class = { |
3560 | .name = "regulator", | |
3561 | .dev_release = regulator_dev_release, | |
3562 | .dev_groups = regulator_dev_groups, | |
3563 | }; | |
3564 | ||
1130e5b3 MB |
3565 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3566 | { | |
a9eaa813 GR |
3567 | struct device *parent = rdev->dev.parent; |
3568 | const char *rname = rdev_get_name(rdev); | |
3569 | char name[NAME_MAX]; | |
3570 | ||
3571 | /* Avoid duplicate debugfs directory names */ | |
3572 | if (parent && rname == rdev->desc->name) { | |
3573 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
3574 | rname); | |
3575 | rname = name; | |
3576 | } | |
3577 | ||
3578 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 3579 | if (!rdev->debugfs) { |
1130e5b3 | 3580 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3581 | return; |
3582 | } | |
3583 | ||
3584 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3585 | &rdev->use_count); | |
3586 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3587 | &rdev->open_count); | |
f59c8f9f MB |
3588 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3589 | &rdev->bypass_count); | |
1130e5b3 MB |
3590 | } |
3591 | ||
414c70cb LG |
3592 | /** |
3593 | * regulator_register - register regulator | |
69279fb9 | 3594 | * @regulator_desc: regulator to register |
f47531b1 | 3595 | * @cfg: runtime configuration for regulator |
414c70cb LG |
3596 | * |
3597 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3598 | * Returns a valid pointer to struct regulator_dev on success |
3599 | * or an ERR_PTR() on error. | |
414c70cb | 3600 | */ |
65f26846 MB |
3601 | struct regulator_dev * |
3602 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 3603 | const struct regulator_config *cfg) |
414c70cb | 3604 | { |
9a8f5e07 | 3605 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3606 | const struct regulator_init_data *init_data; |
1b3de223 | 3607 | struct regulator_config *config = NULL; |
72dca06f | 3608 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 3609 | struct regulator_dev *rdev; |
32c8fad4 | 3610 | struct device *dev; |
a5766f11 | 3611 | int ret, i; |
414c70cb | 3612 | |
1b3de223 | 3613 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
3614 | return ERR_PTR(-EINVAL); |
3615 | ||
1b3de223 | 3616 | dev = cfg->dev; |
dcf70112 | 3617 | WARN_ON(!dev); |
32c8fad4 | 3618 | |
414c70cb LG |
3619 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3620 | return ERR_PTR(-EINVAL); | |
3621 | ||
cd78dfc6 DL |
3622 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3623 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3624 | return ERR_PTR(-EINVAL); |
3625 | ||
476c2d83 MB |
3626 | /* Only one of each should be implemented */ |
3627 | WARN_ON(regulator_desc->ops->get_voltage && | |
3628 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3629 | WARN_ON(regulator_desc->ops->set_voltage && |
3630 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3631 | |
3632 | /* If we're using selectors we must implement list_voltage. */ | |
3633 | if (regulator_desc->ops->get_voltage_sel && | |
3634 | !regulator_desc->ops->list_voltage) { | |
3635 | return ERR_PTR(-EINVAL); | |
3636 | } | |
e8eef82b MB |
3637 | if (regulator_desc->ops->set_voltage_sel && |
3638 | !regulator_desc->ops->list_voltage) { | |
3639 | return ERR_PTR(-EINVAL); | |
3640 | } | |
476c2d83 | 3641 | |
414c70cb LG |
3642 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3643 | if (rdev == NULL) | |
3644 | return ERR_PTR(-ENOMEM); | |
3645 | ||
1b3de223 KK |
3646 | /* |
3647 | * Duplicate the config so the driver could override it after | |
3648 | * parsing init data. | |
3649 | */ | |
3650 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
3651 | if (config == NULL) { | |
3652 | kfree(rdev); | |
3653 | return ERR_PTR(-ENOMEM); | |
3654 | } | |
3655 | ||
bfa21a0d | 3656 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
3657 | &rdev->dev.of_node); |
3658 | if (!init_data) { | |
3659 | init_data = config->init_data; | |
3660 | rdev->dev.of_node = of_node_get(config->of_node); | |
3661 | } | |
3662 | ||
414c70cb LG |
3663 | mutex_lock(®ulator_list_mutex); |
3664 | ||
3665 | mutex_init(&rdev->mutex); | |
c172708d | 3666 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3667 | rdev->owner = regulator_desc->owner; |
3668 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3669 | if (config->regmap) |
3670 | rdev->regmap = config->regmap; | |
52b84dac | 3671 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3672 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3673 | else if (dev->parent) |
3674 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3675 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3676 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3677 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3678 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3679 | |
a5766f11 | 3680 | /* preform any regulator specific init */ |
9a8f5e07 | 3681 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3682 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3683 | if (ret < 0) |
3684 | goto clean; | |
a5766f11 LG |
3685 | } |
3686 | ||
a5766f11 | 3687 | /* register with sysfs */ |
414c70cb | 3688 | rdev->dev.class = ®ulator_class; |
a5766f11 | 3689 | rdev->dev.parent = dev; |
72dca06f | 3690 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 3691 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 3692 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3693 | if (ret != 0) { |
3694 | put_device(&rdev->dev); | |
4fca9545 | 3695 | goto clean; |
ad7725cb | 3696 | } |
a5766f11 LG |
3697 | |
3698 | dev_set_drvdata(&rdev->dev, rdev); | |
3699 | ||
76f439df MP |
3700 | if ((config->ena_gpio || config->ena_gpio_initialized) && |
3701 | gpio_is_valid(config->ena_gpio)) { | |
f19b00da | 3702 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3703 | if (ret != 0) { |
3704 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3705 | config->ena_gpio, ret); | |
b2da55d9 | 3706 | goto wash; |
65f73508 | 3707 | } |
65f73508 MB |
3708 | } |
3709 | ||
74f544c1 | 3710 | /* set regulator constraints */ |
9a8f5e07 MB |
3711 | if (init_data) |
3712 | constraints = &init_data->constraints; | |
3713 | ||
3714 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3715 | if (ret < 0) |
3716 | goto scrub; | |
3717 | ||
9a8f5e07 | 3718 | if (init_data && init_data->supply_regulator) |
6261b06d | 3719 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 3720 | else if (regulator_desc->supply_name) |
6261b06d | 3721 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 3722 | |
a5766f11 | 3723 | /* add consumers devices */ |
9a8f5e07 MB |
3724 | if (init_data) { |
3725 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3726 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3727 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3728 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3729 | if (ret < 0) { |
3730 | dev_err(dev, "Failed to set supply %s\n", | |
3731 | init_data->consumer_supplies[i].supply); | |
3732 | goto unset_supplies; | |
3733 | } | |
23c2f041 | 3734 | } |
414c70cb | 3735 | } |
a5766f11 LG |
3736 | |
3737 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3738 | |
3739 | rdev_init_debugfs(rdev); | |
a5766f11 | 3740 | out: |
414c70cb | 3741 | mutex_unlock(®ulator_list_mutex); |
1b3de223 | 3742 | kfree(config); |
414c70cb | 3743 | return rdev; |
4fca9545 | 3744 | |
d4033b54 JN |
3745 | unset_supplies: |
3746 | unset_regulator_supplies(rdev); | |
3747 | ||
4fca9545 | 3748 | scrub: |
f19b00da | 3749 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3750 | kfree(rdev->constraints); |
b2da55d9 | 3751 | wash: |
4fca9545 | 3752 | device_unregister(&rdev->dev); |
53032daf PW |
3753 | /* device core frees rdev */ |
3754 | rdev = ERR_PTR(ret); | |
3755 | goto out; | |
3756 | ||
4fca9545 DB |
3757 | clean: |
3758 | kfree(rdev); | |
3759 | rdev = ERR_PTR(ret); | |
3760 | goto out; | |
414c70cb LG |
3761 | } |
3762 | EXPORT_SYMBOL_GPL(regulator_register); | |
3763 | ||
3764 | /** | |
3765 | * regulator_unregister - unregister regulator | |
69279fb9 | 3766 | * @rdev: regulator to unregister |
414c70cb LG |
3767 | * |
3768 | * Called by regulator drivers to unregister a regulator. | |
3769 | */ | |
3770 | void regulator_unregister(struct regulator_dev *rdev) | |
3771 | { | |
3772 | if (rdev == NULL) | |
3773 | return; | |
3774 | ||
891636ea MB |
3775 | if (rdev->supply) { |
3776 | while (rdev->use_count--) | |
3777 | regulator_disable(rdev->supply); | |
e032b376 | 3778 | regulator_put(rdev->supply); |
891636ea | 3779 | } |
414c70cb | 3780 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3781 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3782 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3783 | WARN_ON(rdev->open_count); |
0f1d747b | 3784 | unset_regulator_supplies(rdev); |
414c70cb | 3785 | list_del(&rdev->list); |
f8c12fe3 | 3786 | kfree(rdev->constraints); |
f19b00da | 3787 | regulator_ena_gpio_free(rdev); |
63c7c9e1 | 3788 | of_node_put(rdev->dev.of_node); |
58fb5cf5 | 3789 | device_unregister(&rdev->dev); |
414c70cb LG |
3790 | mutex_unlock(®ulator_list_mutex); |
3791 | } | |
3792 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3793 | ||
414c70cb | 3794 | /** |
cf7bbcdf | 3795 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3796 | * @state: system suspend state |
3797 | * | |
3798 | * Configure each regulator with it's suspend operating parameters for state. | |
3799 | * This will usually be called by machine suspend code prior to supending. | |
3800 | */ | |
3801 | int regulator_suspend_prepare(suspend_state_t state) | |
3802 | { | |
3803 | struct regulator_dev *rdev; | |
3804 | int ret = 0; | |
3805 | ||
3806 | /* ON is handled by regulator active state */ | |
3807 | if (state == PM_SUSPEND_ON) | |
3808 | return -EINVAL; | |
3809 | ||
3810 | mutex_lock(®ulator_list_mutex); | |
3811 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3812 | ||
3813 | mutex_lock(&rdev->mutex); | |
3814 | ret = suspend_prepare(rdev, state); | |
3815 | mutex_unlock(&rdev->mutex); | |
3816 | ||
3817 | if (ret < 0) { | |
5da84fd9 | 3818 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3819 | goto out; |
3820 | } | |
3821 | } | |
3822 | out: | |
3823 | mutex_unlock(®ulator_list_mutex); | |
3824 | return ret; | |
3825 | } | |
3826 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3827 | ||
7a32b589 MH |
3828 | /** |
3829 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3830 | * | |
3831 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3832 | * and that should be turned on according to the regulators properties. | |
3833 | */ | |
3834 | int regulator_suspend_finish(void) | |
3835 | { | |
3836 | struct regulator_dev *rdev; | |
3837 | int ret = 0, error; | |
3838 | ||
3839 | mutex_lock(®ulator_list_mutex); | |
3840 | list_for_each_entry(rdev, ®ulator_list, list) { | |
7a32b589 | 3841 | mutex_lock(&rdev->mutex); |
30c21971 | 3842 | if (rdev->use_count > 0 || rdev->constraints->always_on) { |
0548bf4f JMC |
3843 | if (!_regulator_is_enabled(rdev)) { |
3844 | error = _regulator_do_enable(rdev); | |
3845 | if (error) | |
3846 | ret = error; | |
3847 | } | |
7a32b589 | 3848 | } else { |
87b28417 | 3849 | if (!have_full_constraints()) |
7a32b589 | 3850 | goto unlock; |
b1a86831 | 3851 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3852 | goto unlock; |
3853 | ||
66fda75f | 3854 | error = _regulator_do_disable(rdev); |
7a32b589 MH |
3855 | if (error) |
3856 | ret = error; | |
3857 | } | |
3858 | unlock: | |
3859 | mutex_unlock(&rdev->mutex); | |
3860 | } | |
3861 | mutex_unlock(®ulator_list_mutex); | |
3862 | return ret; | |
3863 | } | |
3864 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3865 | ||
ca725561 MB |
3866 | /** |
3867 | * regulator_has_full_constraints - the system has fully specified constraints | |
3868 | * | |
3869 | * Calling this function will cause the regulator API to disable all | |
3870 | * regulators which have a zero use count and don't have an always_on | |
3871 | * constraint in a late_initcall. | |
3872 | * | |
3873 | * The intention is that this will become the default behaviour in a | |
3874 | * future kernel release so users are encouraged to use this facility | |
3875 | * now. | |
3876 | */ | |
3877 | void regulator_has_full_constraints(void) | |
3878 | { | |
3879 | has_full_constraints = 1; | |
3880 | } | |
3881 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3882 | ||
414c70cb LG |
3883 | /** |
3884 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3885 | * @rdev: regulator |
414c70cb LG |
3886 | * |
3887 | * Get rdev regulator driver private data. This call can be used in the | |
3888 | * regulator driver context. | |
3889 | */ | |
3890 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3891 | { | |
3892 | return rdev->reg_data; | |
3893 | } | |
3894 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3895 | ||
3896 | /** | |
3897 | * regulator_get_drvdata - get regulator driver data | |
3898 | * @regulator: regulator | |
3899 | * | |
3900 | * Get regulator driver private data. This call can be used in the consumer | |
3901 | * driver context when non API regulator specific functions need to be called. | |
3902 | */ | |
3903 | void *regulator_get_drvdata(struct regulator *regulator) | |
3904 | { | |
3905 | return regulator->rdev->reg_data; | |
3906 | } | |
3907 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3908 | ||
3909 | /** | |
3910 | * regulator_set_drvdata - set regulator driver data | |
3911 | * @regulator: regulator | |
3912 | * @data: data | |
3913 | */ | |
3914 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3915 | { | |
3916 | regulator->rdev->reg_data = data; | |
3917 | } | |
3918 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3919 | ||
3920 | /** | |
3921 | * regulator_get_id - get regulator ID | |
69279fb9 | 3922 | * @rdev: regulator |
414c70cb LG |
3923 | */ |
3924 | int rdev_get_id(struct regulator_dev *rdev) | |
3925 | { | |
3926 | return rdev->desc->id; | |
3927 | } | |
3928 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3929 | ||
a5766f11 LG |
3930 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3931 | { | |
3932 | return &rdev->dev; | |
3933 | } | |
3934 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3935 | ||
3936 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3937 | { | |
3938 | return reg_init_data->driver_data; | |
3939 | } | |
3940 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3941 | ||
ba55a974 MB |
3942 | #ifdef CONFIG_DEBUG_FS |
3943 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3944 | size_t count, loff_t *ppos) | |
3945 | { | |
3946 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3947 | ssize_t len, ret = 0; | |
3948 | struct regulator_map *map; | |
3949 | ||
3950 | if (!buf) | |
3951 | return -ENOMEM; | |
3952 | ||
3953 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3954 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3955 | "%s -> %s.%s\n", | |
3956 | rdev_get_name(map->regulator), map->dev_name, | |
3957 | map->supply); | |
3958 | if (len >= 0) | |
3959 | ret += len; | |
3960 | if (ret > PAGE_SIZE) { | |
3961 | ret = PAGE_SIZE; | |
3962 | break; | |
3963 | } | |
3964 | } | |
3965 | ||
3966 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3967 | ||
3968 | kfree(buf); | |
3969 | ||
3970 | return ret; | |
3971 | } | |
24751434 | 3972 | #endif |
ba55a974 MB |
3973 | |
3974 | static const struct file_operations supply_map_fops = { | |
24751434 | 3975 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3976 | .read = supply_map_read_file, |
3977 | .llseek = default_llseek, | |
ba55a974 | 3978 | #endif |
24751434 | 3979 | }; |
ba55a974 | 3980 | |
7c225ec9 HS |
3981 | #ifdef CONFIG_DEBUG_FS |
3982 | static void regulator_summary_show_subtree(struct seq_file *s, | |
3983 | struct regulator_dev *rdev, | |
3984 | int level) | |
3985 | { | |
3986 | struct list_head *list = s->private; | |
3987 | struct regulator_dev *child; | |
3988 | struct regulation_constraints *c; | |
3989 | struct regulator *consumer; | |
3990 | ||
3991 | if (!rdev) | |
3992 | return; | |
3993 | ||
7c225ec9 HS |
3994 | seq_printf(s, "%*s%-*s %3d %4d %6d ", |
3995 | level * 3 + 1, "", | |
3996 | 30 - level * 3, rdev_get_name(rdev), | |
3997 | rdev->use_count, rdev->open_count, rdev->bypass_count); | |
3998 | ||
23296099 HS |
3999 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
4000 | seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000); | |
7c225ec9 HS |
4001 | |
4002 | c = rdev->constraints; | |
4003 | if (c) { | |
4004 | switch (rdev->desc->type) { | |
4005 | case REGULATOR_VOLTAGE: | |
4006 | seq_printf(s, "%5dmV %5dmV ", | |
4007 | c->min_uV / 1000, c->max_uV / 1000); | |
4008 | break; | |
4009 | case REGULATOR_CURRENT: | |
4010 | seq_printf(s, "%5dmA %5dmA ", | |
4011 | c->min_uA / 1000, c->max_uA / 1000); | |
4012 | break; | |
4013 | } | |
4014 | } | |
4015 | ||
4016 | seq_puts(s, "\n"); | |
4017 | ||
4018 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
4019 | if (consumer->dev->class == ®ulator_class) | |
4020 | continue; | |
4021 | ||
4022 | seq_printf(s, "%*s%-*s ", | |
4023 | (level + 1) * 3 + 1, "", | |
4024 | 30 - (level + 1) * 3, dev_name(consumer->dev)); | |
4025 | ||
4026 | switch (rdev->desc->type) { | |
4027 | case REGULATOR_VOLTAGE: | |
23296099 | 4028 | seq_printf(s, "%37dmV %5dmV", |
7c225ec9 HS |
4029 | consumer->min_uV / 1000, |
4030 | consumer->max_uV / 1000); | |
4031 | break; | |
4032 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
4033 | break; |
4034 | } | |
4035 | ||
4036 | seq_puts(s, "\n"); | |
4037 | } | |
4038 | ||
7c225ec9 HS |
4039 | list_for_each_entry(child, list, list) { |
4040 | /* handle only non-root regulators supplied by current rdev */ | |
4041 | if (!child->supply || child->supply->rdev != rdev) | |
4042 | continue; | |
4043 | ||
4044 | regulator_summary_show_subtree(s, child, level + 1); | |
4045 | } | |
4046 | } | |
4047 | ||
4048 | static int regulator_summary_show(struct seq_file *s, void *data) | |
4049 | { | |
4050 | struct list_head *list = s->private; | |
4051 | struct regulator_dev *rdev; | |
4052 | ||
23296099 HS |
4053 | seq_puts(s, " regulator use open bypass voltage current min max\n"); |
4054 | seq_puts(s, "-------------------------------------------------------------------------------\n"); | |
7c225ec9 HS |
4055 | |
4056 | mutex_lock(®ulator_list_mutex); | |
4057 | ||
4058 | list_for_each_entry(rdev, list, list) { | |
4059 | if (rdev->supply) | |
4060 | continue; | |
4061 | ||
4062 | regulator_summary_show_subtree(s, rdev, 0); | |
4063 | } | |
4064 | ||
4065 | mutex_unlock(®ulator_list_mutex); | |
4066 | ||
4067 | return 0; | |
4068 | } | |
4069 | ||
4070 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
4071 | { | |
4072 | return single_open(file, regulator_summary_show, inode->i_private); | |
4073 | } | |
4074 | #endif | |
4075 | ||
4076 | static const struct file_operations regulator_summary_fops = { | |
4077 | #ifdef CONFIG_DEBUG_FS | |
4078 | .open = regulator_summary_open, | |
4079 | .read = seq_read, | |
4080 | .llseek = seq_lseek, | |
4081 | .release = single_release, | |
4082 | #endif | |
4083 | }; | |
4084 | ||
414c70cb LG |
4085 | static int __init regulator_init(void) |
4086 | { | |
34abbd68 MB |
4087 | int ret; |
4088 | ||
34abbd68 MB |
4089 | ret = class_register(®ulator_class); |
4090 | ||
1130e5b3 | 4091 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 4092 | if (!debugfs_root) |
1130e5b3 | 4093 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 4094 | |
f4d562c6 MB |
4095 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
4096 | &supply_map_fops); | |
1130e5b3 | 4097 | |
7c225ec9 HS |
4098 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
4099 | ®ulator_list, ®ulator_summary_fops); | |
4100 | ||
34abbd68 MB |
4101 | regulator_dummy_init(); |
4102 | ||
4103 | return ret; | |
414c70cb LG |
4104 | } |
4105 | ||
4106 | /* init early to allow our consumers to complete system booting */ | |
4107 | core_initcall(regulator_init); | |
ca725561 MB |
4108 | |
4109 | static int __init regulator_init_complete(void) | |
4110 | { | |
4111 | struct regulator_dev *rdev; | |
272e2315 | 4112 | const struct regulator_ops *ops; |
ca725561 MB |
4113 | struct regulation_constraints *c; |
4114 | int enabled, ret; | |
ca725561 | 4115 | |
86f5fcfc MB |
4116 | /* |
4117 | * Since DT doesn't provide an idiomatic mechanism for | |
4118 | * enabling full constraints and since it's much more natural | |
4119 | * with DT to provide them just assume that a DT enabled | |
4120 | * system has full constraints. | |
4121 | */ | |
4122 | if (of_have_populated_dt()) | |
4123 | has_full_constraints = true; | |
4124 | ||
ca725561 MB |
4125 | mutex_lock(®ulator_list_mutex); |
4126 | ||
4127 | /* If we have a full configuration then disable any regulators | |
e9535834 MB |
4128 | * we have permission to change the status for and which are |
4129 | * not in use or always_on. This is effectively the default | |
4130 | * for DT and ACPI as they have full constraints. | |
ca725561 MB |
4131 | */ |
4132 | list_for_each_entry(rdev, ®ulator_list, list) { | |
4133 | ops = rdev->desc->ops; | |
4134 | c = rdev->constraints; | |
4135 | ||
66fda75f | 4136 | if (c && c->always_on) |
ca725561 MB |
4137 | continue; |
4138 | ||
e9535834 MB |
4139 | if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) |
4140 | continue; | |
4141 | ||
ca725561 MB |
4142 | mutex_lock(&rdev->mutex); |
4143 | ||
4144 | if (rdev->use_count) | |
4145 | goto unlock; | |
4146 | ||
4147 | /* If we can't read the status assume it's on. */ | |
4148 | if (ops->is_enabled) | |
4149 | enabled = ops->is_enabled(rdev); | |
4150 | else | |
4151 | enabled = 1; | |
4152 | ||
4153 | if (!enabled) | |
4154 | goto unlock; | |
4155 | ||
87b28417 | 4156 | if (have_full_constraints()) { |
ca725561 MB |
4157 | /* We log since this may kill the system if it |
4158 | * goes wrong. */ | |
5da84fd9 | 4159 | rdev_info(rdev, "disabling\n"); |
66fda75f | 4160 | ret = _regulator_do_disable(rdev); |
0d25d09d | 4161 | if (ret != 0) |
5da84fd9 | 4162 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
4163 | } else { |
4164 | /* The intention is that in future we will | |
4165 | * assume that full constraints are provided | |
4166 | * so warn even if we aren't going to do | |
4167 | * anything here. | |
4168 | */ | |
5da84fd9 | 4169 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
4170 | } |
4171 | ||
4172 | unlock: | |
4173 | mutex_unlock(&rdev->mutex); | |
4174 | } | |
4175 | ||
4176 | mutex_unlock(®ulator_list_mutex); | |
4177 | ||
4178 | return 0; | |
4179 | } | |
fd482a3e | 4180 | late_initcall_sync(regulator_init_complete); |