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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> | |
18 | #include <linux/device.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/suspend.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <linux/regulator/driver.h> | |
24 | #include <linux/regulator/machine.h> | |
25 | ||
26 | #define REGULATOR_VERSION "0.5" | |
27 | ||
28 | static DEFINE_MUTEX(regulator_list_mutex); | |
29 | static LIST_HEAD(regulator_list); | |
30 | static LIST_HEAD(regulator_map_list); | |
31 | ||
32 | /** | |
33 | * struct regulator_dev | |
34 | * | |
35 | * Voltage / Current regulator class device. One for each regulator. | |
36 | */ | |
37 | struct regulator_dev { | |
38 | struct regulator_desc *desc; | |
39 | int use_count; | |
40 | ||
41 | /* lists we belong to */ | |
42 | struct list_head list; /* list of all regulators */ | |
43 | struct list_head slist; /* list of supplied regulators */ | |
44 | ||
45 | /* lists we own */ | |
46 | struct list_head consumer_list; /* consumers we supply */ | |
47 | struct list_head supply_list; /* regulators we supply */ | |
48 | ||
49 | struct blocking_notifier_head notifier; | |
50 | struct mutex mutex; /* consumer lock */ | |
51 | struct module *owner; | |
52 | struct device dev; | |
53 | struct regulation_constraints *constraints; | |
54 | struct regulator_dev *supply; /* for tree */ | |
55 | ||
56 | void *reg_data; /* regulator_dev data */ | |
57 | }; | |
58 | ||
59 | /** | |
60 | * struct regulator_map | |
61 | * | |
62 | * Used to provide symbolic supply names to devices. | |
63 | */ | |
64 | struct regulator_map { | |
65 | struct list_head list; | |
66 | struct device *dev; | |
67 | const char *supply; | |
a5766f11 | 68 | struct regulator_dev *regulator; |
414c70cb LG |
69 | }; |
70 | ||
414c70cb LG |
71 | /* |
72 | * struct regulator | |
73 | * | |
74 | * One for each consumer device. | |
75 | */ | |
76 | struct regulator { | |
77 | struct device *dev; | |
78 | struct list_head list; | |
79 | int uA_load; | |
80 | int min_uV; | |
81 | int max_uV; | |
82 | int enabled; /* client has called enabled */ | |
83 | char *supply_name; | |
84 | struct device_attribute dev_attr; | |
85 | struct regulator_dev *rdev; | |
86 | }; | |
87 | ||
88 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
89 | static int _regulator_disable(struct regulator_dev *rdev); | |
90 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
91 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
92 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
93 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
94 | unsigned long event, void *data); | |
95 | ||
96 | /* gets the regulator for a given consumer device */ | |
97 | static struct regulator *get_device_regulator(struct device *dev) | |
98 | { | |
99 | struct regulator *regulator = NULL; | |
100 | struct regulator_dev *rdev; | |
101 | ||
102 | mutex_lock(®ulator_list_mutex); | |
103 | list_for_each_entry(rdev, ®ulator_list, list) { | |
104 | mutex_lock(&rdev->mutex); | |
105 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
106 | if (regulator->dev == dev) { | |
107 | mutex_unlock(&rdev->mutex); | |
108 | mutex_unlock(®ulator_list_mutex); | |
109 | return regulator; | |
110 | } | |
111 | } | |
112 | mutex_unlock(&rdev->mutex); | |
113 | } | |
114 | mutex_unlock(®ulator_list_mutex); | |
115 | return NULL; | |
116 | } | |
117 | ||
118 | /* Platform voltage constraint check */ | |
119 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
120 | int *min_uV, int *max_uV) | |
121 | { | |
122 | BUG_ON(*min_uV > *max_uV); | |
123 | ||
124 | if (!rdev->constraints) { | |
125 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
126 | rdev->desc->name); | |
127 | return -ENODEV; | |
128 | } | |
129 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
130 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
131 | __func__, rdev->desc->name); | |
132 | return -EPERM; | |
133 | } | |
134 | ||
135 | if (*max_uV > rdev->constraints->max_uV) | |
136 | *max_uV = rdev->constraints->max_uV; | |
137 | if (*min_uV < rdev->constraints->min_uV) | |
138 | *min_uV = rdev->constraints->min_uV; | |
139 | ||
140 | if (*min_uV > *max_uV) | |
141 | return -EINVAL; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | /* current constraint check */ | |
147 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
148 | int *min_uA, int *max_uA) | |
149 | { | |
150 | BUG_ON(*min_uA > *max_uA); | |
151 | ||
152 | if (!rdev->constraints) { | |
153 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
154 | rdev->desc->name); | |
155 | return -ENODEV; | |
156 | } | |
157 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
158 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
159 | __func__, rdev->desc->name); | |
160 | return -EPERM; | |
161 | } | |
162 | ||
163 | if (*max_uA > rdev->constraints->max_uA) | |
164 | *max_uA = rdev->constraints->max_uA; | |
165 | if (*min_uA < rdev->constraints->min_uA) | |
166 | *min_uA = rdev->constraints->min_uA; | |
167 | ||
168 | if (*min_uA > *max_uA) | |
169 | return -EINVAL; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | /* operating mode constraint check */ | |
175 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
176 | { | |
177 | if (!rdev->constraints) { | |
178 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
179 | rdev->desc->name); | |
180 | return -ENODEV; | |
181 | } | |
182 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
183 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
184 | __func__, rdev->desc->name); | |
185 | return -EPERM; | |
186 | } | |
187 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
188 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
189 | __func__, mode, rdev->desc->name); | |
190 | return -EINVAL; | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | /* dynamic regulator mode switching constraint check */ | |
196 | static int regulator_check_drms(struct regulator_dev *rdev) | |
197 | { | |
198 | if (!rdev->constraints) { | |
199 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
200 | rdev->desc->name); | |
201 | return -ENODEV; | |
202 | } | |
203 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
204 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
205 | __func__, rdev->desc->name); | |
206 | return -EPERM; | |
207 | } | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static ssize_t device_requested_uA_show(struct device *dev, | |
212 | struct device_attribute *attr, char *buf) | |
213 | { | |
214 | struct regulator *regulator; | |
215 | ||
216 | regulator = get_device_regulator(dev); | |
217 | if (regulator == NULL) | |
218 | return 0; | |
219 | ||
220 | return sprintf(buf, "%d\n", regulator->uA_load); | |
221 | } | |
222 | ||
223 | static ssize_t regulator_uV_show(struct device *dev, | |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
a5766f11 | 226 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
227 | ssize_t ret; |
228 | ||
229 | mutex_lock(&rdev->mutex); | |
230 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
231 | mutex_unlock(&rdev->mutex); | |
232 | ||
233 | return ret; | |
234 | } | |
235 | ||
236 | static ssize_t regulator_uA_show(struct device *dev, | |
237 | struct device_attribute *attr, char *buf) | |
238 | { | |
a5766f11 | 239 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
240 | |
241 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
242 | } | |
243 | ||
bc558a60 MB |
244 | static ssize_t regulator_name_show(struct device *dev, |
245 | struct device_attribute *attr, char *buf) | |
246 | { | |
247 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
248 | const char *name; | |
249 | ||
250 | if (rdev->constraints->name) | |
251 | name = rdev->constraints->name; | |
252 | else if (rdev->desc->name) | |
253 | name = rdev->desc->name; | |
254 | else | |
255 | name = ""; | |
256 | ||
257 | return sprintf(buf, "%s\n", name); | |
258 | } | |
259 | ||
414c70cb LG |
260 | static ssize_t regulator_opmode_show(struct device *dev, |
261 | struct device_attribute *attr, char *buf) | |
262 | { | |
a5766f11 | 263 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
264 | int mode = _regulator_get_mode(rdev); |
265 | ||
266 | switch (mode) { | |
267 | case REGULATOR_MODE_FAST: | |
268 | return sprintf(buf, "fast\n"); | |
269 | case REGULATOR_MODE_NORMAL: | |
270 | return sprintf(buf, "normal\n"); | |
271 | case REGULATOR_MODE_IDLE: | |
272 | return sprintf(buf, "idle\n"); | |
273 | case REGULATOR_MODE_STANDBY: | |
274 | return sprintf(buf, "standby\n"); | |
275 | } | |
276 | return sprintf(buf, "unknown\n"); | |
277 | } | |
278 | ||
279 | static ssize_t regulator_state_show(struct device *dev, | |
280 | struct device_attribute *attr, char *buf) | |
281 | { | |
a5766f11 | 282 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
283 | int state = _regulator_is_enabled(rdev); |
284 | ||
285 | if (state > 0) | |
286 | return sprintf(buf, "enabled\n"); | |
287 | else if (state == 0) | |
288 | return sprintf(buf, "disabled\n"); | |
289 | else | |
290 | return sprintf(buf, "unknown\n"); | |
291 | } | |
292 | ||
293 | static ssize_t regulator_min_uA_show(struct device *dev, | |
294 | struct device_attribute *attr, char *buf) | |
295 | { | |
a5766f11 | 296 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
297 | |
298 | if (!rdev->constraints) | |
299 | return sprintf(buf, "constraint not defined\n"); | |
300 | ||
301 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
302 | } | |
303 | ||
304 | static ssize_t regulator_max_uA_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 | |
309 | if (!rdev->constraints) | |
310 | return sprintf(buf, "constraint not defined\n"); | |
311 | ||
312 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
313 | } | |
314 | ||
315 | static ssize_t regulator_min_uV_show(struct device *dev, | |
316 | struct device_attribute *attr, char *buf) | |
317 | { | |
a5766f11 | 318 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
319 | |
320 | if (!rdev->constraints) | |
321 | return sprintf(buf, "constraint not defined\n"); | |
322 | ||
323 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
324 | } | |
325 | ||
326 | static ssize_t regulator_max_uV_show(struct device *dev, | |
327 | struct device_attribute *attr, char *buf) | |
328 | { | |
a5766f11 | 329 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
330 | |
331 | if (!rdev->constraints) | |
332 | return sprintf(buf, "constraint not defined\n"); | |
333 | ||
334 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
335 | } | |
336 | ||
337 | static ssize_t regulator_total_uA_show(struct device *dev, | |
338 | struct device_attribute *attr, char *buf) | |
339 | { | |
a5766f11 | 340 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
341 | struct regulator *regulator; |
342 | int uA = 0; | |
343 | ||
344 | mutex_lock(&rdev->mutex); | |
345 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
346 | uA += regulator->uA_load; | |
347 | mutex_unlock(&rdev->mutex); | |
348 | return sprintf(buf, "%d\n", uA); | |
349 | } | |
350 | ||
351 | static ssize_t regulator_num_users_show(struct device *dev, | |
352 | struct device_attribute *attr, char *buf) | |
353 | { | |
a5766f11 | 354 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
355 | return sprintf(buf, "%d\n", rdev->use_count); |
356 | } | |
357 | ||
358 | static ssize_t regulator_type_show(struct device *dev, | |
359 | struct device_attribute *attr, char *buf) | |
360 | { | |
a5766f11 | 361 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
362 | |
363 | switch (rdev->desc->type) { | |
364 | case REGULATOR_VOLTAGE: | |
365 | return sprintf(buf, "voltage\n"); | |
366 | case REGULATOR_CURRENT: | |
367 | return sprintf(buf, "current\n"); | |
368 | } | |
369 | return sprintf(buf, "unknown\n"); | |
370 | } | |
371 | ||
372 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
373 | struct device_attribute *attr, char *buf) | |
374 | { | |
a5766f11 | 375 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
376 | |
377 | if (!rdev->constraints) | |
378 | return sprintf(buf, "not defined\n"); | |
379 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); | |
380 | } | |
381 | ||
382 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
383 | struct device_attribute *attr, char *buf) | |
384 | { | |
a5766f11 | 385 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
386 | |
387 | if (!rdev->constraints) | |
388 | return sprintf(buf, "not defined\n"); | |
389 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); | |
390 | } | |
391 | ||
392 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
393 | struct device_attribute *attr, char *buf) | |
394 | { | |
a5766f11 | 395 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
396 | |
397 | if (!rdev->constraints) | |
398 | return sprintf(buf, "not defined\n"); | |
399 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); | |
400 | } | |
401 | ||
402 | static ssize_t suspend_opmode_show(struct regulator_dev *rdev, | |
403 | unsigned int mode, char *buf) | |
404 | { | |
405 | switch (mode) { | |
406 | case REGULATOR_MODE_FAST: | |
407 | return sprintf(buf, "fast\n"); | |
408 | case REGULATOR_MODE_NORMAL: | |
409 | return sprintf(buf, "normal\n"); | |
410 | case REGULATOR_MODE_IDLE: | |
411 | return sprintf(buf, "idle\n"); | |
412 | case REGULATOR_MODE_STANDBY: | |
413 | return sprintf(buf, "standby\n"); | |
414 | } | |
415 | return sprintf(buf, "unknown\n"); | |
416 | } | |
417 | ||
418 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, | |
419 | struct device_attribute *attr, char *buf) | |
420 | { | |
a5766f11 | 421 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
422 | |
423 | if (!rdev->constraints) | |
424 | return sprintf(buf, "not defined\n"); | |
425 | return suspend_opmode_show(rdev, | |
426 | rdev->constraints->state_mem.mode, buf); | |
427 | } | |
428 | ||
429 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
430 | struct device_attribute *attr, char *buf) | |
431 | { | |
a5766f11 | 432 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
433 | |
434 | if (!rdev->constraints) | |
435 | return sprintf(buf, "not defined\n"); | |
436 | return suspend_opmode_show(rdev, | |
437 | rdev->constraints->state_disk.mode, buf); | |
438 | } | |
439 | ||
440 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
441 | struct device_attribute *attr, char *buf) | |
442 | { | |
a5766f11 | 443 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
444 | |
445 | if (!rdev->constraints) | |
446 | return sprintf(buf, "not defined\n"); | |
447 | return suspend_opmode_show(rdev, | |
448 | rdev->constraints->state_standby.mode, buf); | |
449 | } | |
450 | ||
451 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
452 | struct device_attribute *attr, char *buf) | |
453 | { | |
a5766f11 | 454 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
455 | |
456 | if (!rdev->constraints) | |
457 | return sprintf(buf, "not defined\n"); | |
458 | ||
459 | if (rdev->constraints->state_mem.enabled) | |
460 | return sprintf(buf, "enabled\n"); | |
461 | else | |
462 | return sprintf(buf, "disabled\n"); | |
463 | } | |
464 | ||
465 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
466 | struct device_attribute *attr, char *buf) | |
467 | { | |
a5766f11 | 468 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
469 | |
470 | if (!rdev->constraints) | |
471 | return sprintf(buf, "not defined\n"); | |
472 | ||
473 | if (rdev->constraints->state_disk.enabled) | |
474 | return sprintf(buf, "enabled\n"); | |
475 | else | |
476 | return sprintf(buf, "disabled\n"); | |
477 | } | |
478 | ||
479 | static ssize_t regulator_suspend_standby_state_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 | |
484 | if (!rdev->constraints) | |
485 | return sprintf(buf, "not defined\n"); | |
486 | ||
487 | if (rdev->constraints->state_standby.enabled) | |
488 | return sprintf(buf, "enabled\n"); | |
489 | else | |
490 | return sprintf(buf, "disabled\n"); | |
491 | } | |
bc558a60 | 492 | |
414c70cb | 493 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 494 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
495 | __ATTR(microvolts, 0444, regulator_uV_show, NULL), |
496 | __ATTR(microamps, 0444, regulator_uA_show, NULL), | |
497 | __ATTR(opmode, 0444, regulator_opmode_show, NULL), | |
498 | __ATTR(state, 0444, regulator_state_show, NULL), | |
499 | __ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL), | |
500 | __ATTR(min_microamps, 0444, regulator_min_uA_show, NULL), | |
501 | __ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL), | |
502 | __ATTR(max_microamps, 0444, regulator_max_uA_show, NULL), | |
503 | __ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL), | |
504 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), | |
505 | __ATTR(type, 0444, regulator_type_show, NULL), | |
506 | __ATTR(suspend_mem_microvolts, 0444, | |
507 | regulator_suspend_mem_uV_show, NULL), | |
508 | __ATTR(suspend_disk_microvolts, 0444, | |
509 | regulator_suspend_disk_uV_show, NULL), | |
510 | __ATTR(suspend_standby_microvolts, 0444, | |
511 | regulator_suspend_standby_uV_show, NULL), | |
512 | __ATTR(suspend_mem_mode, 0444, | |
513 | regulator_suspend_mem_mode_show, NULL), | |
514 | __ATTR(suspend_disk_mode, 0444, | |
515 | regulator_suspend_disk_mode_show, NULL), | |
516 | __ATTR(suspend_standby_mode, 0444, | |
517 | regulator_suspend_standby_mode_show, NULL), | |
518 | __ATTR(suspend_mem_state, 0444, | |
519 | regulator_suspend_mem_state_show, NULL), | |
520 | __ATTR(suspend_disk_state, 0444, | |
521 | regulator_suspend_disk_state_show, NULL), | |
522 | __ATTR(suspend_standby_state, 0444, | |
523 | regulator_suspend_standby_state_show, NULL), | |
524 | __ATTR_NULL, | |
525 | }; | |
526 | ||
527 | static void regulator_dev_release(struct device *dev) | |
528 | { | |
a5766f11 | 529 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
530 | kfree(rdev); |
531 | } | |
532 | ||
533 | static struct class regulator_class = { | |
534 | .name = "regulator", | |
535 | .dev_release = regulator_dev_release, | |
536 | .dev_attrs = regulator_dev_attrs, | |
537 | }; | |
538 | ||
539 | /* Calculate the new optimum regulator operating mode based on the new total | |
540 | * consumer load. All locks held by caller */ | |
541 | static void drms_uA_update(struct regulator_dev *rdev) | |
542 | { | |
543 | struct regulator *sibling; | |
544 | int current_uA = 0, output_uV, input_uV, err; | |
545 | unsigned int mode; | |
546 | ||
547 | err = regulator_check_drms(rdev); | |
548 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
549 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode); | |
550 | return; | |
551 | ||
552 | /* get output voltage */ | |
553 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
554 | if (output_uV <= 0) | |
555 | return; | |
556 | ||
557 | /* get input voltage */ | |
558 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
559 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
560 | else | |
561 | input_uV = rdev->constraints->input_uV; | |
562 | if (input_uV <= 0) | |
563 | return; | |
564 | ||
565 | /* calc total requested load */ | |
566 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
567 | current_uA += sibling->uA_load; | |
568 | ||
569 | /* now get the optimum mode for our new total regulator load */ | |
570 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
571 | output_uV, current_uA); | |
572 | ||
573 | /* check the new mode is allowed */ | |
574 | err = regulator_check_mode(rdev, mode); | |
575 | if (err == 0) | |
576 | rdev->desc->ops->set_mode(rdev, mode); | |
577 | } | |
578 | ||
579 | static int suspend_set_state(struct regulator_dev *rdev, | |
580 | struct regulator_state *rstate) | |
581 | { | |
582 | int ret = 0; | |
583 | ||
584 | /* enable & disable are mandatory for suspend control */ | |
585 | if (!rdev->desc->ops->set_suspend_enable || | |
a5766f11 LG |
586 | !rdev->desc->ops->set_suspend_disable) { |
587 | printk(KERN_ERR "%s: no way to set suspend state\n", | |
588 | __func__); | |
414c70cb | 589 | return -EINVAL; |
a5766f11 | 590 | } |
414c70cb LG |
591 | |
592 | if (rstate->enabled) | |
593 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
594 | else | |
595 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
596 | if (ret < 0) { | |
597 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
598 | return ret; | |
599 | } | |
600 | ||
601 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
602 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
603 | if (ret < 0) { | |
604 | printk(KERN_ERR "%s: failed to set voltage\n", | |
605 | __func__); | |
606 | return ret; | |
607 | } | |
608 | } | |
609 | ||
610 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
611 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
612 | if (ret < 0) { | |
613 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
614 | return ret; | |
615 | } | |
616 | } | |
617 | return ret; | |
618 | } | |
619 | ||
620 | /* locks held by caller */ | |
621 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
622 | { | |
623 | if (!rdev->constraints) | |
624 | return -EINVAL; | |
625 | ||
626 | switch (state) { | |
627 | case PM_SUSPEND_STANDBY: | |
628 | return suspend_set_state(rdev, | |
629 | &rdev->constraints->state_standby); | |
630 | case PM_SUSPEND_MEM: | |
631 | return suspend_set_state(rdev, | |
632 | &rdev->constraints->state_mem); | |
633 | case PM_SUSPEND_MAX: | |
634 | return suspend_set_state(rdev, | |
635 | &rdev->constraints->state_disk); | |
636 | default: | |
637 | return -EINVAL; | |
638 | } | |
639 | } | |
640 | ||
641 | static void print_constraints(struct regulator_dev *rdev) | |
642 | { | |
643 | struct regulation_constraints *constraints = rdev->constraints; | |
644 | char buf[80]; | |
645 | int count; | |
646 | ||
647 | if (rdev->desc->type == REGULATOR_VOLTAGE) { | |
648 | if (constraints->min_uV == constraints->max_uV) | |
649 | count = sprintf(buf, "%d mV ", | |
650 | constraints->min_uV / 1000); | |
651 | else | |
652 | count = sprintf(buf, "%d <--> %d mV ", | |
653 | constraints->min_uV / 1000, | |
654 | constraints->max_uV / 1000); | |
655 | } else { | |
656 | if (constraints->min_uA == constraints->max_uA) | |
657 | count = sprintf(buf, "%d mA ", | |
658 | constraints->min_uA / 1000); | |
659 | else | |
660 | count = sprintf(buf, "%d <--> %d mA ", | |
661 | constraints->min_uA / 1000, | |
662 | constraints->max_uA / 1000); | |
663 | } | |
664 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) | |
665 | count += sprintf(buf + count, "fast "); | |
666 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
667 | count += sprintf(buf + count, "normal "); | |
668 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
669 | count += sprintf(buf + count, "idle "); | |
670 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
671 | count += sprintf(buf + count, "standby"); | |
672 | ||
673 | printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf); | |
674 | } | |
675 | ||
a5766f11 LG |
676 | /** |
677 | * set_machine_constraints - sets regulator constraints | |
678 | * @regulator: regulator source | |
679 | * | |
680 | * Allows platform initialisation code to define and constrain | |
681 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
682 | * Constraints *must* be set by platform code in order for some | |
683 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
684 | * set_mode. | |
685 | */ | |
686 | static int set_machine_constraints(struct regulator_dev *rdev, | |
687 | struct regulation_constraints *constraints) | |
688 | { | |
689 | int ret = 0; | |
e06f5b4f | 690 | const char *name; |
e5fda26c | 691 | struct regulator_ops *ops = rdev->desc->ops; |
e06f5b4f MB |
692 | |
693 | if (constraints->name) | |
694 | name = constraints->name; | |
695 | else if (rdev->desc->name) | |
696 | name = rdev->desc->name; | |
697 | else | |
698 | name = "regulator"; | |
a5766f11 LG |
699 | |
700 | rdev->constraints = constraints; | |
701 | ||
702 | /* do we need to apply the constraint voltage */ | |
703 | if (rdev->constraints->apply_uV && | |
704 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
e5fda26c MB |
705 | ops->set_voltage) { |
706 | ret = ops->set_voltage(rdev, | |
a5766f11 LG |
707 | rdev->constraints->min_uV, rdev->constraints->max_uV); |
708 | if (ret < 0) { | |
e06f5b4f MB |
709 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", |
710 | __func__, | |
711 | rdev->constraints->min_uV, name); | |
a5766f11 LG |
712 | rdev->constraints = NULL; |
713 | goto out; | |
714 | } | |
715 | } | |
716 | ||
717 | /* are we enabled at boot time by firmware / bootloader */ | |
718 | if (rdev->constraints->boot_on) | |
719 | rdev->use_count = 1; | |
720 | ||
721 | /* do we need to setup our suspend state */ | |
e06f5b4f | 722 | if (constraints->initial_state) { |
a5766f11 | 723 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
724 | if (ret < 0) { |
725 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
726 | __func__, name); | |
727 | rdev->constraints = NULL; | |
728 | goto out; | |
729 | } | |
730 | } | |
a5766f11 | 731 | |
e5fda26c MB |
732 | /* if always_on is set then turn the regulator on if it's not |
733 | * already on. */ | |
734 | if (constraints->always_on && ops->enable && | |
735 | ((ops->is_enabled && !ops->is_enabled(rdev)) || | |
736 | (!ops->is_enabled && !constraints->boot_on))) { | |
737 | ret = ops->enable(rdev); | |
738 | if (ret < 0) { | |
739 | printk(KERN_ERR "%s: failed to enable %s\n", | |
740 | __func__, name); | |
741 | rdev->constraints = NULL; | |
742 | goto out; | |
743 | } | |
744 | } | |
745 | ||
a5766f11 LG |
746 | print_constraints(rdev); |
747 | out: | |
748 | return ret; | |
749 | } | |
750 | ||
751 | /** | |
752 | * set_supply - set regulator supply regulator | |
753 | * @regulator: regulator name | |
754 | * @supply: supply regulator name | |
755 | * | |
756 | * Called by platform initialisation code to set the supply regulator for this | |
757 | * regulator. This ensures that a regulators supply will also be enabled by the | |
758 | * core if it's child is enabled. | |
759 | */ | |
760 | static int set_supply(struct regulator_dev *rdev, | |
761 | struct regulator_dev *supply_rdev) | |
762 | { | |
763 | int err; | |
764 | ||
765 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
766 | "supply"); | |
767 | if (err) { | |
768 | printk(KERN_ERR | |
769 | "%s: could not add device link %s err %d\n", | |
770 | __func__, supply_rdev->dev.kobj.name, err); | |
771 | goto out; | |
772 | } | |
773 | rdev->supply = supply_rdev; | |
774 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
775 | out: | |
776 | return err; | |
777 | } | |
778 | ||
779 | /** | |
780 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
781 | * @regulator: regulator source | |
782 | * @dev: device the supply applies to | |
783 | * @supply: symbolic name for supply | |
784 | * | |
785 | * Allows platform initialisation code to map physical regulator | |
786 | * sources to symbolic names for supplies for use by devices. Devices | |
787 | * should use these symbolic names to request regulators, avoiding the | |
788 | * need to provide board-specific regulator names as platform data. | |
789 | */ | |
790 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
791 | struct device *consumer_dev, const char *supply) | |
792 | { | |
793 | struct regulator_map *node; | |
794 | ||
795 | if (supply == NULL) | |
796 | return -EINVAL; | |
797 | ||
798 | node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); | |
799 | if (node == NULL) | |
800 | return -ENOMEM; | |
801 | ||
802 | node->regulator = rdev; | |
803 | node->dev = consumer_dev; | |
804 | node->supply = supply; | |
805 | ||
806 | list_add(&node->list, ®ulator_map_list); | |
807 | return 0; | |
808 | } | |
809 | ||
810 | static void unset_consumer_device_supply(struct regulator_dev *rdev, | |
811 | struct device *consumer_dev) | |
812 | { | |
813 | struct regulator_map *node, *n; | |
814 | ||
815 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
816 | if (rdev == node->regulator && | |
817 | consumer_dev == node->dev) { | |
818 | list_del(&node->list); | |
819 | kfree(node); | |
820 | return; | |
821 | } | |
822 | } | |
823 | } | |
824 | ||
414c70cb LG |
825 | #define REG_STR_SIZE 32 |
826 | ||
827 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
828 | struct device *dev, | |
829 | const char *supply_name) | |
830 | { | |
831 | struct regulator *regulator; | |
832 | char buf[REG_STR_SIZE]; | |
833 | int err, size; | |
834 | ||
835 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
836 | if (regulator == NULL) | |
837 | return NULL; | |
838 | ||
839 | mutex_lock(&rdev->mutex); | |
840 | regulator->rdev = rdev; | |
841 | list_add(®ulator->list, &rdev->consumer_list); | |
842 | ||
843 | if (dev) { | |
844 | /* create a 'requested_microamps_name' sysfs entry */ | |
845 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
846 | supply_name); | |
847 | if (size >= REG_STR_SIZE) | |
848 | goto overflow_err; | |
849 | ||
850 | regulator->dev = dev; | |
851 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); | |
852 | if (regulator->dev_attr.attr.name == NULL) | |
853 | goto attr_name_err; | |
854 | ||
855 | regulator->dev_attr.attr.owner = THIS_MODULE; | |
856 | regulator->dev_attr.attr.mode = 0444; | |
857 | regulator->dev_attr.show = device_requested_uA_show; | |
858 | err = device_create_file(dev, ®ulator->dev_attr); | |
859 | if (err < 0) { | |
860 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
861 | " load sysfs\n", __func__); | |
862 | goto attr_name_err; | |
863 | } | |
864 | ||
865 | /* also add a link to the device sysfs entry */ | |
866 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
867 | dev->kobj.name, supply_name); | |
868 | if (size >= REG_STR_SIZE) | |
869 | goto attr_err; | |
870 | ||
871 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
872 | if (regulator->supply_name == NULL) | |
873 | goto attr_err; | |
874 | ||
875 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
876 | buf); | |
877 | if (err) { | |
878 | printk(KERN_WARNING | |
879 | "%s: could not add device link %s err %d\n", | |
880 | __func__, dev->kobj.name, err); | |
881 | device_remove_file(dev, ®ulator->dev_attr); | |
882 | goto link_name_err; | |
883 | } | |
884 | } | |
885 | mutex_unlock(&rdev->mutex); | |
886 | return regulator; | |
887 | link_name_err: | |
888 | kfree(regulator->supply_name); | |
889 | attr_err: | |
890 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
891 | attr_name_err: | |
892 | kfree(regulator->dev_attr.attr.name); | |
893 | overflow_err: | |
894 | list_del(®ulator->list); | |
895 | kfree(regulator); | |
896 | mutex_unlock(&rdev->mutex); | |
897 | return NULL; | |
898 | } | |
899 | ||
900 | /** | |
901 | * regulator_get - lookup and obtain a reference to a regulator. | |
902 | * @dev: device for regulator "consumer" | |
903 | * @id: Supply name or regulator ID. | |
904 | * | |
905 | * Returns a struct regulator corresponding to the regulator producer, | |
906 | * or IS_ERR() condition containing errno. Use of supply names | |
907 | * configured via regulator_set_device_supply() is strongly | |
908 | * encouraged. | |
909 | */ | |
910 | struct regulator *regulator_get(struct device *dev, const char *id) | |
911 | { | |
912 | struct regulator_dev *rdev; | |
913 | struct regulator_map *map; | |
914 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
414c70cb LG |
915 | |
916 | if (id == NULL) { | |
917 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
918 | return regulator; | |
919 | } | |
920 | ||
921 | mutex_lock(®ulator_list_mutex); | |
922 | ||
923 | list_for_each_entry(map, ®ulator_map_list, list) { | |
924 | if (dev == map->dev && | |
925 | strcmp(map->supply, id) == 0) { | |
a5766f11 | 926 | rdev = map->regulator; |
414c70cb | 927 | goto found; |
a5766f11 | 928 | } |
414c70cb LG |
929 | } |
930 | printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n", | |
931 | id); | |
932 | mutex_unlock(®ulator_list_mutex); | |
933 | return regulator; | |
934 | ||
935 | found: | |
a5766f11 LG |
936 | if (!try_module_get(rdev->owner)) |
937 | goto out; | |
938 | ||
414c70cb LG |
939 | regulator = create_regulator(rdev, dev, id); |
940 | if (regulator == NULL) { | |
941 | regulator = ERR_PTR(-ENOMEM); | |
942 | module_put(rdev->owner); | |
943 | } | |
944 | ||
a5766f11 | 945 | out: |
414c70cb LG |
946 | mutex_unlock(®ulator_list_mutex); |
947 | return regulator; | |
948 | } | |
949 | EXPORT_SYMBOL_GPL(regulator_get); | |
950 | ||
951 | /** | |
952 | * regulator_put - "free" the regulator source | |
953 | * @regulator: regulator source | |
954 | * | |
955 | * Note: drivers must ensure that all regulator_enable calls made on this | |
956 | * regulator source are balanced by regulator_disable calls prior to calling | |
957 | * this function. | |
958 | */ | |
959 | void regulator_put(struct regulator *regulator) | |
960 | { | |
961 | struct regulator_dev *rdev; | |
962 | ||
963 | if (regulator == NULL || IS_ERR(regulator)) | |
964 | return; | |
965 | ||
966 | if (regulator->enabled) { | |
967 | printk(KERN_WARNING "Releasing supply %s while enabled\n", | |
968 | regulator->supply_name); | |
969 | WARN_ON(regulator->enabled); | |
970 | regulator_disable(regulator); | |
971 | } | |
972 | ||
973 | mutex_lock(®ulator_list_mutex); | |
974 | rdev = regulator->rdev; | |
975 | ||
976 | /* remove any sysfs entries */ | |
977 | if (regulator->dev) { | |
978 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
979 | kfree(regulator->supply_name); | |
980 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
981 | kfree(regulator->dev_attr.attr.name); | |
982 | } | |
983 | list_del(®ulator->list); | |
984 | kfree(regulator); | |
985 | ||
986 | module_put(rdev->owner); | |
987 | mutex_unlock(®ulator_list_mutex); | |
988 | } | |
989 | EXPORT_SYMBOL_GPL(regulator_put); | |
990 | ||
991 | /* locks held by regulator_enable() */ | |
992 | static int _regulator_enable(struct regulator_dev *rdev) | |
993 | { | |
994 | int ret = -EINVAL; | |
995 | ||
996 | if (!rdev->constraints) { | |
997 | printk(KERN_ERR "%s: %s has no constraints\n", | |
998 | __func__, rdev->desc->name); | |
999 | return ret; | |
1000 | } | |
1001 | ||
1002 | /* do we need to enable the supply regulator first */ | |
1003 | if (rdev->supply) { | |
1004 | ret = _regulator_enable(rdev->supply); | |
1005 | if (ret < 0) { | |
1006 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1007 | __func__, rdev->desc->name, ret); | |
1008 | return ret; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | /* check voltage and requested load before enabling */ | |
1013 | if (rdev->desc->ops->enable) { | |
1014 | ||
1015 | if (rdev->constraints && | |
1016 | (rdev->constraints->valid_ops_mask & | |
1017 | REGULATOR_CHANGE_DRMS)) | |
1018 | drms_uA_update(rdev); | |
1019 | ||
1020 | ret = rdev->desc->ops->enable(rdev); | |
1021 | if (ret < 0) { | |
1022 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1023 | __func__, rdev->desc->name, ret); | |
1024 | return ret; | |
1025 | } | |
1026 | rdev->use_count++; | |
1027 | return ret; | |
1028 | } | |
1029 | ||
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | /** | |
1034 | * regulator_enable - enable regulator output | |
1035 | * @regulator: regulator source | |
1036 | * | |
1037 | * Enable the regulator output at the predefined voltage or current value. | |
1038 | * NOTE: the output value can be set by other drivers, boot loader or may be | |
1039 | * hardwired in the regulator. | |
1040 | * NOTE: calls to regulator_enable() must be balanced with calls to | |
1041 | * regulator_disable(). | |
1042 | */ | |
1043 | int regulator_enable(struct regulator *regulator) | |
1044 | { | |
1045 | int ret; | |
1046 | ||
1047 | if (regulator->enabled) { | |
1048 | printk(KERN_CRIT "Regulator %s already enabled\n", | |
1049 | regulator->supply_name); | |
1050 | WARN_ON(regulator->enabled); | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | mutex_lock(®ulator->rdev->mutex); | |
1055 | regulator->enabled = 1; | |
1056 | ret = _regulator_enable(regulator->rdev); | |
1057 | if (ret != 0) | |
1058 | regulator->enabled = 0; | |
1059 | mutex_unlock(®ulator->rdev->mutex); | |
1060 | return ret; | |
1061 | } | |
1062 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1063 | ||
1064 | /* locks held by regulator_disable() */ | |
1065 | static int _regulator_disable(struct regulator_dev *rdev) | |
1066 | { | |
1067 | int ret = 0; | |
1068 | ||
1069 | /* are we the last user and permitted to disable ? */ | |
1070 | if (rdev->use_count == 1 && !rdev->constraints->always_on) { | |
1071 | ||
1072 | /* we are last user */ | |
1073 | if (rdev->desc->ops->disable) { | |
1074 | ret = rdev->desc->ops->disable(rdev); | |
1075 | if (ret < 0) { | |
1076 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1077 | __func__, rdev->desc->name); | |
1078 | return ret; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* decrease our supplies ref count and disable if required */ | |
1083 | if (rdev->supply) | |
1084 | _regulator_disable(rdev->supply); | |
1085 | ||
1086 | rdev->use_count = 0; | |
1087 | } else if (rdev->use_count > 1) { | |
1088 | ||
1089 | if (rdev->constraints && | |
1090 | (rdev->constraints->valid_ops_mask & | |
1091 | REGULATOR_CHANGE_DRMS)) | |
1092 | drms_uA_update(rdev); | |
1093 | ||
1094 | rdev->use_count--; | |
1095 | } | |
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * regulator_disable - disable regulator output | |
1101 | * @regulator: regulator source | |
1102 | * | |
1103 | * Disable the regulator output voltage or current. | |
1104 | * NOTE: this will only disable the regulator output if no other consumer | |
1105 | * devices have it enabled. | |
1106 | * NOTE: calls to regulator_enable() must be balanced with calls to | |
1107 | * regulator_disable(). | |
1108 | */ | |
1109 | int regulator_disable(struct regulator *regulator) | |
1110 | { | |
1111 | int ret; | |
1112 | ||
1113 | if (!regulator->enabled) { | |
1114 | printk(KERN_ERR "%s: not in use by this consumer\n", | |
1115 | __func__); | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | mutex_lock(®ulator->rdev->mutex); | |
1120 | regulator->enabled = 0; | |
1121 | regulator->uA_load = 0; | |
1122 | ret = _regulator_disable(regulator->rdev); | |
1123 | mutex_unlock(®ulator->rdev->mutex); | |
1124 | return ret; | |
1125 | } | |
1126 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1127 | ||
1128 | /* locks held by regulator_force_disable() */ | |
1129 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1130 | { | |
1131 | int ret = 0; | |
1132 | ||
1133 | /* force disable */ | |
1134 | if (rdev->desc->ops->disable) { | |
1135 | /* ah well, who wants to live forever... */ | |
1136 | ret = rdev->desc->ops->disable(rdev); | |
1137 | if (ret < 0) { | |
1138 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1139 | __func__, rdev->desc->name); | |
1140 | return ret; | |
1141 | } | |
1142 | /* notify other consumers that power has been forced off */ | |
1143 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, | |
1144 | NULL); | |
1145 | } | |
1146 | ||
1147 | /* decrease our supplies ref count and disable if required */ | |
1148 | if (rdev->supply) | |
1149 | _regulator_disable(rdev->supply); | |
1150 | ||
1151 | rdev->use_count = 0; | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * regulator_force_disable - force disable regulator output | |
1157 | * @regulator: regulator source | |
1158 | * | |
1159 | * Forcibly disable the regulator output voltage or current. | |
1160 | * NOTE: this *will* disable the regulator output even if other consumer | |
1161 | * devices have it enabled. This should be used for situations when device | |
1162 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1163 | */ | |
1164 | int regulator_force_disable(struct regulator *regulator) | |
1165 | { | |
1166 | int ret; | |
1167 | ||
1168 | mutex_lock(®ulator->rdev->mutex); | |
1169 | regulator->enabled = 0; | |
1170 | regulator->uA_load = 0; | |
1171 | ret = _regulator_force_disable(regulator->rdev); | |
1172 | mutex_unlock(®ulator->rdev->mutex); | |
1173 | return ret; | |
1174 | } | |
1175 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1176 | ||
1177 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1178 | { | |
1179 | int ret; | |
1180 | ||
1181 | mutex_lock(&rdev->mutex); | |
1182 | ||
1183 | /* sanity check */ | |
1184 | if (!rdev->desc->ops->is_enabled) { | |
1185 | ret = -EINVAL; | |
1186 | goto out; | |
1187 | } | |
1188 | ||
1189 | ret = rdev->desc->ops->is_enabled(rdev); | |
1190 | out: | |
1191 | mutex_unlock(&rdev->mutex); | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | /** | |
1196 | * regulator_is_enabled - is the regulator output enabled | |
1197 | * @regulator: regulator source | |
1198 | * | |
1199 | * Returns zero for disabled otherwise return number of enable requests. | |
1200 | */ | |
1201 | int regulator_is_enabled(struct regulator *regulator) | |
1202 | { | |
1203 | return _regulator_is_enabled(regulator->rdev); | |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1206 | ||
1207 | /** | |
1208 | * regulator_set_voltage - set regulator output voltage | |
1209 | * @regulator: regulator source | |
1210 | * @min_uV: Minimum required voltage in uV | |
1211 | * @max_uV: Maximum acceptable voltage in uV | |
1212 | * | |
1213 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1214 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1215 | * | |
1216 | * If the regulator is enabled then the voltage will change to the new value | |
1217 | * immediately otherwise if the regulator is disabled the regulator will | |
1218 | * output at the new voltage when enabled. | |
1219 | * | |
1220 | * NOTE: If the regulator is shared between several devices then the lowest | |
1221 | * request voltage that meets the system constraints will be used. | |
1222 | * NOTE: Regulator system constraints must be set for this regulator before | |
1223 | * calling this function otherwise this call will fail. | |
1224 | */ | |
1225 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1226 | { | |
1227 | struct regulator_dev *rdev = regulator->rdev; | |
1228 | int ret; | |
1229 | ||
1230 | mutex_lock(&rdev->mutex); | |
1231 | ||
1232 | /* sanity check */ | |
1233 | if (!rdev->desc->ops->set_voltage) { | |
1234 | ret = -EINVAL; | |
1235 | goto out; | |
1236 | } | |
1237 | ||
1238 | /* constraints check */ | |
1239 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1240 | if (ret < 0) | |
1241 | goto out; | |
1242 | regulator->min_uV = min_uV; | |
1243 | regulator->max_uV = max_uV; | |
1244 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1245 | ||
1246 | out: | |
1247 | mutex_unlock(&rdev->mutex); | |
1248 | return ret; | |
1249 | } | |
1250 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1251 | ||
1252 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1253 | { | |
1254 | /* sanity check */ | |
1255 | if (rdev->desc->ops->get_voltage) | |
1256 | return rdev->desc->ops->get_voltage(rdev); | |
1257 | else | |
1258 | return -EINVAL; | |
1259 | } | |
1260 | ||
1261 | /** | |
1262 | * regulator_get_voltage - get regulator output voltage | |
1263 | * @regulator: regulator source | |
1264 | * | |
1265 | * This returns the current regulator voltage in uV. | |
1266 | * | |
1267 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1268 | * function should not be used to determine regulator state. | |
1269 | */ | |
1270 | int regulator_get_voltage(struct regulator *regulator) | |
1271 | { | |
1272 | int ret; | |
1273 | ||
1274 | mutex_lock(®ulator->rdev->mutex); | |
1275 | ||
1276 | ret = _regulator_get_voltage(regulator->rdev); | |
1277 | ||
1278 | mutex_unlock(®ulator->rdev->mutex); | |
1279 | ||
1280 | return ret; | |
1281 | } | |
1282 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1283 | ||
1284 | /** | |
1285 | * regulator_set_current_limit - set regulator output current limit | |
1286 | * @regulator: regulator source | |
1287 | * @min_uA: Minimuum supported current in uA | |
1288 | * @max_uA: Maximum supported current in uA | |
1289 | * | |
1290 | * Sets current sink to the desired output current. This can be set during | |
1291 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1292 | * | |
1293 | * If the regulator is enabled then the current will change to the new value | |
1294 | * immediately otherwise if the regulator is disabled the regulator will | |
1295 | * output at the new current when enabled. | |
1296 | * | |
1297 | * NOTE: Regulator system constraints must be set for this regulator before | |
1298 | * calling this function otherwise this call will fail. | |
1299 | */ | |
1300 | int regulator_set_current_limit(struct regulator *regulator, | |
1301 | int min_uA, int max_uA) | |
1302 | { | |
1303 | struct regulator_dev *rdev = regulator->rdev; | |
1304 | int ret; | |
1305 | ||
1306 | mutex_lock(&rdev->mutex); | |
1307 | ||
1308 | /* sanity check */ | |
1309 | if (!rdev->desc->ops->set_current_limit) { | |
1310 | ret = -EINVAL; | |
1311 | goto out; | |
1312 | } | |
1313 | ||
1314 | /* constraints check */ | |
1315 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1316 | if (ret < 0) | |
1317 | goto out; | |
1318 | ||
1319 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1320 | out: | |
1321 | mutex_unlock(&rdev->mutex); | |
1322 | return ret; | |
1323 | } | |
1324 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1325 | ||
1326 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1327 | { | |
1328 | int ret; | |
1329 | ||
1330 | mutex_lock(&rdev->mutex); | |
1331 | ||
1332 | /* sanity check */ | |
1333 | if (!rdev->desc->ops->get_current_limit) { | |
1334 | ret = -EINVAL; | |
1335 | goto out; | |
1336 | } | |
1337 | ||
1338 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1339 | out: | |
1340 | mutex_unlock(&rdev->mutex); | |
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | /** | |
1345 | * regulator_get_current_limit - get regulator output current | |
1346 | * @regulator: regulator source | |
1347 | * | |
1348 | * This returns the current supplied by the specified current sink in uA. | |
1349 | * | |
1350 | * NOTE: If the regulator is disabled it will return the current value. This | |
1351 | * function should not be used to determine regulator state. | |
1352 | */ | |
1353 | int regulator_get_current_limit(struct regulator *regulator) | |
1354 | { | |
1355 | return _regulator_get_current_limit(regulator->rdev); | |
1356 | } | |
1357 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1358 | ||
1359 | /** | |
1360 | * regulator_set_mode - set regulator operating mode | |
1361 | * @regulator: regulator source | |
1362 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1363 | * | |
1364 | * Set regulator operating mode to increase regulator efficiency or improve | |
1365 | * regulation performance. | |
1366 | * | |
1367 | * NOTE: Regulator system constraints must be set for this regulator before | |
1368 | * calling this function otherwise this call will fail. | |
1369 | */ | |
1370 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1371 | { | |
1372 | struct regulator_dev *rdev = regulator->rdev; | |
1373 | int ret; | |
1374 | ||
1375 | mutex_lock(&rdev->mutex); | |
1376 | ||
1377 | /* sanity check */ | |
1378 | if (!rdev->desc->ops->set_mode) { | |
1379 | ret = -EINVAL; | |
1380 | goto out; | |
1381 | } | |
1382 | ||
1383 | /* constraints check */ | |
1384 | ret = regulator_check_mode(rdev, mode); | |
1385 | if (ret < 0) | |
1386 | goto out; | |
1387 | ||
1388 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1389 | out: | |
1390 | mutex_unlock(&rdev->mutex); | |
1391 | return ret; | |
1392 | } | |
1393 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1394 | ||
1395 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1396 | { | |
1397 | int ret; | |
1398 | ||
1399 | mutex_lock(&rdev->mutex); | |
1400 | ||
1401 | /* sanity check */ | |
1402 | if (!rdev->desc->ops->get_mode) { | |
1403 | ret = -EINVAL; | |
1404 | goto out; | |
1405 | } | |
1406 | ||
1407 | ret = rdev->desc->ops->get_mode(rdev); | |
1408 | out: | |
1409 | mutex_unlock(&rdev->mutex); | |
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | /** | |
1414 | * regulator_get_mode - get regulator operating mode | |
1415 | * @regulator: regulator source | |
1416 | * | |
1417 | * Get the current regulator operating mode. | |
1418 | */ | |
1419 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1420 | { | |
1421 | return _regulator_get_mode(regulator->rdev); | |
1422 | } | |
1423 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1424 | ||
1425 | /** | |
1426 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1427 | * @regulator: regulator source | |
1428 | * @uA_load: load current | |
1429 | * | |
1430 | * Notifies the regulator core of a new device load. This is then used by | |
1431 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1432 | * operating mode for the new regulator loading. | |
1433 | * | |
1434 | * Consumer devices notify their supply regulator of the maximum power | |
1435 | * they will require (can be taken from device datasheet in the power | |
1436 | * consumption tables) when they change operational status and hence power | |
1437 | * state. Examples of operational state changes that can affect power | |
1438 | * consumption are :- | |
1439 | * | |
1440 | * o Device is opened / closed. | |
1441 | * o Device I/O is about to begin or has just finished. | |
1442 | * o Device is idling in between work. | |
1443 | * | |
1444 | * This information is also exported via sysfs to userspace. | |
1445 | * | |
1446 | * DRMS will sum the total requested load on the regulator and change | |
1447 | * to the most efficient operating mode if platform constraints allow. | |
1448 | * | |
1449 | * Returns the new regulator mode or error. | |
1450 | */ | |
1451 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1452 | { | |
1453 | struct regulator_dev *rdev = regulator->rdev; | |
1454 | struct regulator *consumer; | |
1455 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1456 | unsigned int mode; | |
1457 | ||
1458 | mutex_lock(&rdev->mutex); | |
1459 | ||
1460 | regulator->uA_load = uA_load; | |
1461 | ret = regulator_check_drms(rdev); | |
1462 | if (ret < 0) | |
1463 | goto out; | |
1464 | ret = -EINVAL; | |
1465 | ||
1466 | /* sanity check */ | |
1467 | if (!rdev->desc->ops->get_optimum_mode) | |
1468 | goto out; | |
1469 | ||
1470 | /* get output voltage */ | |
1471 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1472 | if (output_uV <= 0) { | |
1473 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1474 | __func__, rdev->desc->name); | |
1475 | goto out; | |
1476 | } | |
1477 | ||
1478 | /* get input voltage */ | |
1479 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1480 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1481 | else | |
1482 | input_uV = rdev->constraints->input_uV; | |
1483 | if (input_uV <= 0) { | |
1484 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1485 | __func__, rdev->desc->name); | |
1486 | goto out; | |
1487 | } | |
1488 | ||
1489 | /* calc total requested load for this regulator */ | |
1490 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
1491 | total_uA_load += consumer->uA_load; | |
1492 | ||
1493 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1494 | input_uV, output_uV, | |
1495 | total_uA_load); | |
1496 | if (ret <= 0) { | |
1497 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" | |
1498 | " %d uA %d -> %d uV\n", __func__, rdev->desc->name, | |
1499 | total_uA_load, input_uV, output_uV); | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1504 | if (ret <= 0) { | |
1505 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", | |
1506 | __func__, mode, rdev->desc->name); | |
1507 | goto out; | |
1508 | } | |
1509 | ret = mode; | |
1510 | out: | |
1511 | mutex_unlock(&rdev->mutex); | |
1512 | return ret; | |
1513 | } | |
1514 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1515 | ||
1516 | /** | |
1517 | * regulator_register_notifier - register regulator event notifier | |
1518 | * @regulator: regulator source | |
1519 | * @notifier_block: notifier block | |
1520 | * | |
1521 | * Register notifier block to receive regulator events. | |
1522 | */ | |
1523 | int regulator_register_notifier(struct regulator *regulator, | |
1524 | struct notifier_block *nb) | |
1525 | { | |
1526 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1527 | nb); | |
1528 | } | |
1529 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1530 | ||
1531 | /** | |
1532 | * regulator_unregister_notifier - unregister regulator event notifier | |
1533 | * @regulator: regulator source | |
1534 | * @notifier_block: notifier block | |
1535 | * | |
1536 | * Unregister regulator event notifier block. | |
1537 | */ | |
1538 | int regulator_unregister_notifier(struct regulator *regulator, | |
1539 | struct notifier_block *nb) | |
1540 | { | |
1541 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1542 | nb); | |
1543 | } | |
1544 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1545 | ||
1546 | /* notify regulator consumers and downstream regulator consumers */ | |
1547 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
1548 | unsigned long event, void *data) | |
1549 | { | |
1550 | struct regulator_dev *_rdev; | |
1551 | ||
1552 | /* call rdev chain first */ | |
1553 | mutex_lock(&rdev->mutex); | |
1554 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); | |
1555 | mutex_unlock(&rdev->mutex); | |
1556 | ||
1557 | /* now notify regulator we supply */ | |
1558 | list_for_each_entry(_rdev, &rdev->supply_list, slist) | |
1559 | _notifier_call_chain(_rdev, event, data); | |
1560 | } | |
1561 | ||
1562 | /** | |
1563 | * regulator_bulk_get - get multiple regulator consumers | |
1564 | * | |
1565 | * @dev: Device to supply | |
1566 | * @num_consumers: Number of consumers to register | |
1567 | * @consumers: Configuration of consumers; clients are stored here. | |
1568 | * | |
1569 | * @return 0 on success, an errno on failure. | |
1570 | * | |
1571 | * This helper function allows drivers to get several regulator | |
1572 | * consumers in one operation. If any of the regulators cannot be | |
1573 | * acquired then any regulators that were allocated will be freed | |
1574 | * before returning to the caller. | |
1575 | */ | |
1576 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1577 | struct regulator_bulk_data *consumers) | |
1578 | { | |
1579 | int i; | |
1580 | int ret; | |
1581 | ||
1582 | for (i = 0; i < num_consumers; i++) | |
1583 | consumers[i].consumer = NULL; | |
1584 | ||
1585 | for (i = 0; i < num_consumers; i++) { | |
1586 | consumers[i].consumer = regulator_get(dev, | |
1587 | consumers[i].supply); | |
1588 | if (IS_ERR(consumers[i].consumer)) { | |
1589 | dev_err(dev, "Failed to get supply '%s'\n", | |
1590 | consumers[i].supply); | |
1591 | ret = PTR_ERR(consumers[i].consumer); | |
1592 | consumers[i].consumer = NULL; | |
1593 | goto err; | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | return 0; | |
1598 | ||
1599 | err: | |
1600 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1601 | regulator_put(consumers[i].consumer); | |
1602 | ||
1603 | return ret; | |
1604 | } | |
1605 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1606 | ||
1607 | /** | |
1608 | * regulator_bulk_enable - enable multiple regulator consumers | |
1609 | * | |
1610 | * @num_consumers: Number of consumers | |
1611 | * @consumers: Consumer data; clients are stored here. | |
1612 | * @return 0 on success, an errno on failure | |
1613 | * | |
1614 | * This convenience API allows consumers to enable multiple regulator | |
1615 | * clients in a single API call. If any consumers cannot be enabled | |
1616 | * then any others that were enabled will be disabled again prior to | |
1617 | * return. | |
1618 | */ | |
1619 | int regulator_bulk_enable(int num_consumers, | |
1620 | struct regulator_bulk_data *consumers) | |
1621 | { | |
1622 | int i; | |
1623 | int ret; | |
1624 | ||
1625 | for (i = 0; i < num_consumers; i++) { | |
1626 | ret = regulator_enable(consumers[i].consumer); | |
1627 | if (ret != 0) | |
1628 | goto err; | |
1629 | } | |
1630 | ||
1631 | return 0; | |
1632 | ||
1633 | err: | |
1634 | printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); | |
1635 | for (i = 0; i < num_consumers; i++) | |
1636 | regulator_disable(consumers[i].consumer); | |
1637 | ||
1638 | return ret; | |
1639 | } | |
1640 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
1641 | ||
1642 | /** | |
1643 | * regulator_bulk_disable - disable multiple regulator consumers | |
1644 | * | |
1645 | * @num_consumers: Number of consumers | |
1646 | * @consumers: Consumer data; clients are stored here. | |
1647 | * @return 0 on success, an errno on failure | |
1648 | * | |
1649 | * This convenience API allows consumers to disable multiple regulator | |
1650 | * clients in a single API call. If any consumers cannot be enabled | |
1651 | * then any others that were disabled will be disabled again prior to | |
1652 | * return. | |
1653 | */ | |
1654 | int regulator_bulk_disable(int num_consumers, | |
1655 | struct regulator_bulk_data *consumers) | |
1656 | { | |
1657 | int i; | |
1658 | int ret; | |
1659 | ||
1660 | for (i = 0; i < num_consumers; i++) { | |
1661 | ret = regulator_disable(consumers[i].consumer); | |
1662 | if (ret != 0) | |
1663 | goto err; | |
1664 | } | |
1665 | ||
1666 | return 0; | |
1667 | ||
1668 | err: | |
1669 | printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); | |
1670 | for (i = 0; i < num_consumers; i++) | |
1671 | regulator_enable(consumers[i].consumer); | |
1672 | ||
1673 | return ret; | |
1674 | } | |
1675 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
1676 | ||
1677 | /** | |
1678 | * regulator_bulk_free - free multiple regulator consumers | |
1679 | * | |
1680 | * @num_consumers: Number of consumers | |
1681 | * @consumers: Consumer data; clients are stored here. | |
1682 | * | |
1683 | * This convenience API allows consumers to free multiple regulator | |
1684 | * clients in a single API call. | |
1685 | */ | |
1686 | void regulator_bulk_free(int num_consumers, | |
1687 | struct regulator_bulk_data *consumers) | |
1688 | { | |
1689 | int i; | |
1690 | ||
1691 | for (i = 0; i < num_consumers; i++) { | |
1692 | regulator_put(consumers[i].consumer); | |
1693 | consumers[i].consumer = NULL; | |
1694 | } | |
1695 | } | |
1696 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
1697 | ||
1698 | /** | |
1699 | * regulator_notifier_call_chain - call regulator event notifier | |
1700 | * @regulator: regulator source | |
1701 | * @event: notifier block | |
1702 | * @data: | |
1703 | * | |
1704 | * Called by regulator drivers to notify clients a regulator event has | |
1705 | * occurred. We also notify regulator clients downstream. | |
1706 | */ | |
1707 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
1708 | unsigned long event, void *data) | |
1709 | { | |
1710 | _notifier_call_chain(rdev, event, data); | |
1711 | return NOTIFY_DONE; | |
1712 | ||
1713 | } | |
1714 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
1715 | ||
1716 | /** | |
1717 | * regulator_register - register regulator | |
1718 | * @regulator: regulator source | |
1719 | * @reg_data: private regulator data | |
1720 | * | |
1721 | * Called by regulator drivers to register a regulator. | |
1722 | * Returns 0 on success. | |
1723 | */ | |
1724 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
a5766f11 | 1725 | struct device *dev, void *driver_data) |
414c70cb LG |
1726 | { |
1727 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
1728 | struct regulator_dev *rdev; | |
a5766f11 LG |
1729 | struct regulator_init_data *init_data = dev->platform_data; |
1730 | int ret, i; | |
414c70cb LG |
1731 | |
1732 | if (regulator_desc == NULL) | |
1733 | return ERR_PTR(-EINVAL); | |
1734 | ||
1735 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
1736 | return ERR_PTR(-EINVAL); | |
1737 | ||
1738 | if (!regulator_desc->type == REGULATOR_VOLTAGE && | |
1739 | !regulator_desc->type == REGULATOR_CURRENT) | |
1740 | return ERR_PTR(-EINVAL); | |
1741 | ||
46fabe1e MB |
1742 | if (!init_data) |
1743 | return ERR_PTR(-EINVAL); | |
1744 | ||
414c70cb LG |
1745 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
1746 | if (rdev == NULL) | |
1747 | return ERR_PTR(-ENOMEM); | |
1748 | ||
1749 | mutex_lock(®ulator_list_mutex); | |
1750 | ||
1751 | mutex_init(&rdev->mutex); | |
a5766f11 | 1752 | rdev->reg_data = driver_data; |
414c70cb LG |
1753 | rdev->owner = regulator_desc->owner; |
1754 | rdev->desc = regulator_desc; | |
1755 | INIT_LIST_HEAD(&rdev->consumer_list); | |
1756 | INIT_LIST_HEAD(&rdev->supply_list); | |
1757 | INIT_LIST_HEAD(&rdev->list); | |
1758 | INIT_LIST_HEAD(&rdev->slist); | |
1759 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
1760 | ||
a5766f11 LG |
1761 | /* preform any regulator specific init */ |
1762 | if (init_data->regulator_init) { | |
1763 | ret = init_data->regulator_init(rdev->reg_data); | |
1764 | if (ret < 0) { | |
1765 | kfree(rdev); | |
1766 | rdev = ERR_PTR(ret); | |
1767 | goto out; | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | /* set regulator constraints */ | |
1772 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
1773 | if (ret < 0) { | |
1774 | kfree(rdev); | |
1775 | rdev = ERR_PTR(ret); | |
1776 | goto out; | |
1777 | } | |
1778 | ||
1779 | /* register with sysfs */ | |
414c70cb | 1780 | rdev->dev.class = ®ulator_class; |
a5766f11 | 1781 | rdev->dev.parent = dev; |
414c70cb | 1782 | snprintf(rdev->dev.bus_id, sizeof(rdev->dev.bus_id), |
a5766f11 LG |
1783 | "regulator.%d", atomic_inc_return(®ulator_no) - 1); |
1784 | ret = device_register(&rdev->dev); | |
1785 | if (ret != 0) { | |
414c70cb LG |
1786 | kfree(rdev); |
1787 | rdev = ERR_PTR(ret); | |
a5766f11 LG |
1788 | goto out; |
1789 | } | |
1790 | ||
1791 | dev_set_drvdata(&rdev->dev, rdev); | |
1792 | ||
1793 | /* set supply regulator if it exists */ | |
1794 | if (init_data->supply_regulator_dev) { | |
1795 | ret = set_supply(rdev, | |
1796 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
1797 | if (ret < 0) { | |
1798 | device_unregister(&rdev->dev); | |
1799 | kfree(rdev); | |
1800 | rdev = ERR_PTR(ret); | |
1801 | goto out; | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | /* add consumers devices */ | |
1806 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
1807 | ret = set_consumer_device_supply(rdev, | |
1808 | init_data->consumer_supplies[i].dev, | |
1809 | init_data->consumer_supplies[i].supply); | |
1810 | if (ret < 0) { | |
1811 | for (--i; i >= 0; i--) | |
1812 | unset_consumer_device_supply(rdev, | |
1813 | init_data->consumer_supplies[i].dev); | |
1814 | device_unregister(&rdev->dev); | |
1815 | kfree(rdev); | |
1816 | rdev = ERR_PTR(ret); | |
1817 | goto out; | |
1818 | } | |
414c70cb | 1819 | } |
a5766f11 LG |
1820 | |
1821 | list_add(&rdev->list, ®ulator_list); | |
1822 | out: | |
414c70cb LG |
1823 | mutex_unlock(®ulator_list_mutex); |
1824 | return rdev; | |
1825 | } | |
1826 | EXPORT_SYMBOL_GPL(regulator_register); | |
1827 | ||
1828 | /** | |
1829 | * regulator_unregister - unregister regulator | |
1830 | * @regulator: regulator source | |
1831 | * | |
1832 | * Called by regulator drivers to unregister a regulator. | |
1833 | */ | |
1834 | void regulator_unregister(struct regulator_dev *rdev) | |
1835 | { | |
1836 | if (rdev == NULL) | |
1837 | return; | |
1838 | ||
1839 | mutex_lock(®ulator_list_mutex); | |
1840 | list_del(&rdev->list); | |
1841 | if (rdev->supply) | |
1842 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
1843 | device_unregister(&rdev->dev); | |
1844 | mutex_unlock(®ulator_list_mutex); | |
1845 | } | |
1846 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
1847 | ||
414c70cb LG |
1848 | /** |
1849 | * regulator_suspend_prepare: prepare regulators for system wide suspend | |
1850 | * @state: system suspend state | |
1851 | * | |
1852 | * Configure each regulator with it's suspend operating parameters for state. | |
1853 | * This will usually be called by machine suspend code prior to supending. | |
1854 | */ | |
1855 | int regulator_suspend_prepare(suspend_state_t state) | |
1856 | { | |
1857 | struct regulator_dev *rdev; | |
1858 | int ret = 0; | |
1859 | ||
1860 | /* ON is handled by regulator active state */ | |
1861 | if (state == PM_SUSPEND_ON) | |
1862 | return -EINVAL; | |
1863 | ||
1864 | mutex_lock(®ulator_list_mutex); | |
1865 | list_for_each_entry(rdev, ®ulator_list, list) { | |
1866 | ||
1867 | mutex_lock(&rdev->mutex); | |
1868 | ret = suspend_prepare(rdev, state); | |
1869 | mutex_unlock(&rdev->mutex); | |
1870 | ||
1871 | if (ret < 0) { | |
1872 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
1873 | __func__, rdev->desc->name); | |
1874 | goto out; | |
1875 | } | |
1876 | } | |
1877 | out: | |
1878 | mutex_unlock(®ulator_list_mutex); | |
1879 | return ret; | |
1880 | } | |
1881 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
1882 | ||
1883 | /** | |
1884 | * rdev_get_drvdata - get rdev regulator driver data | |
1885 | * @regulator: regulator | |
1886 | * | |
1887 | * Get rdev regulator driver private data. This call can be used in the | |
1888 | * regulator driver context. | |
1889 | */ | |
1890 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
1891 | { | |
1892 | return rdev->reg_data; | |
1893 | } | |
1894 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
1895 | ||
1896 | /** | |
1897 | * regulator_get_drvdata - get regulator driver data | |
1898 | * @regulator: regulator | |
1899 | * | |
1900 | * Get regulator driver private data. This call can be used in the consumer | |
1901 | * driver context when non API regulator specific functions need to be called. | |
1902 | */ | |
1903 | void *regulator_get_drvdata(struct regulator *regulator) | |
1904 | { | |
1905 | return regulator->rdev->reg_data; | |
1906 | } | |
1907 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
1908 | ||
1909 | /** | |
1910 | * regulator_set_drvdata - set regulator driver data | |
1911 | * @regulator: regulator | |
1912 | * @data: data | |
1913 | */ | |
1914 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
1915 | { | |
1916 | regulator->rdev->reg_data = data; | |
1917 | } | |
1918 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
1919 | ||
1920 | /** | |
1921 | * regulator_get_id - get regulator ID | |
1922 | * @regulator: regulator | |
1923 | */ | |
1924 | int rdev_get_id(struct regulator_dev *rdev) | |
1925 | { | |
1926 | return rdev->desc->id; | |
1927 | } | |
1928 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
1929 | ||
a5766f11 LG |
1930 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
1931 | { | |
1932 | return &rdev->dev; | |
1933 | } | |
1934 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
1935 | ||
1936 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
1937 | { | |
1938 | return reg_init_data->driver_data; | |
1939 | } | |
1940 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
1941 | ||
414c70cb LG |
1942 | static int __init regulator_init(void) |
1943 | { | |
1944 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); | |
1945 | return class_register(®ulator_class); | |
1946 | } | |
1947 | ||
1948 | /* init early to allow our consumers to complete system booting */ | |
1949 | core_initcall(regulator_init); |