Commit | Line | Data |
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2744e8af LW |
1 | /* |
2 | * Core driver for the pin control subsystem | |
3 | * | |
befe5bdf | 4 | * Copyright (C) 2011-2012 ST-Ericsson SA |
2744e8af LW |
5 | * Written on behalf of Linaro for ST-Ericsson |
6 | * Based on bits of regulator core, gpio core and clk core | |
7 | * | |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
9 | * | |
b2b3e66e SW |
10 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
11 | * | |
2744e8af LW |
12 | * License terms: GNU General Public License (GPL) version 2 |
13 | */ | |
14 | #define pr_fmt(fmt) "pinctrl core: " fmt | |
15 | ||
16 | #include <linux/kernel.h> | |
a5a697cd | 17 | #include <linux/export.h> |
2744e8af LW |
18 | #include <linux/init.h> |
19 | #include <linux/device.h> | |
20 | #include <linux/slab.h> | |
2744e8af LW |
21 | #include <linux/err.h> |
22 | #include <linux/list.h> | |
2744e8af LW |
23 | #include <linux/sysfs.h> |
24 | #include <linux/debugfs.h> | |
25 | #include <linux/seq_file.h> | |
6d4ca1fb | 26 | #include <linux/pinctrl/consumer.h> |
2744e8af LW |
27 | #include <linux/pinctrl/pinctrl.h> |
28 | #include <linux/pinctrl/machine.h> | |
29 | #include "core.h" | |
57291ce2 | 30 | #include "devicetree.h" |
2744e8af | 31 | #include "pinmux.h" |
ae6b4d85 | 32 | #include "pinconf.h" |
2744e8af | 33 | |
b2b3e66e SW |
34 | /** |
35 | * struct pinctrl_maps - a list item containing part of the mapping table | |
36 | * @node: mapping table list node | |
37 | * @maps: array of mapping table entries | |
38 | * @num_maps: the number of entries in @maps | |
39 | */ | |
40 | struct pinctrl_maps { | |
41 | struct list_head node; | |
42 | struct pinctrl_map const *maps; | |
43 | unsigned num_maps; | |
44 | }; | |
45 | ||
5b3aa5f7 DA |
46 | static bool pinctrl_dummy_state; |
47 | ||
57b676f9 SW |
48 | /* Mutex taken by all entry points */ |
49 | DEFINE_MUTEX(pinctrl_mutex); | |
50 | ||
51 | /* Global list of pin control devices (struct pinctrl_dev) */ | |
57291ce2 | 52 | LIST_HEAD(pinctrldev_list); |
2744e8af | 53 | |
57b676f9 | 54 | /* List of pin controller handles (struct pinctrl) */ |
befe5bdf LW |
55 | static LIST_HEAD(pinctrl_list); |
56 | ||
57b676f9 | 57 | /* List of pinctrl maps (struct pinctrl_maps) */ |
b2b3e66e SW |
58 | static LIST_HEAD(pinctrl_maps); |
59 | ||
60 | #define for_each_maps(_maps_node_, _i_, _map_) \ | |
61 | list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ | |
62 | for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ | |
63 | _i_ < _maps_node_->num_maps; \ | |
bc66468c | 64 | _i_++, _map_ = &_maps_node_->maps[_i_]) |
befe5bdf | 65 | |
5b3aa5f7 DA |
66 | /** |
67 | * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support | |
68 | * | |
69 | * Usually this function is called by platforms without pinctrl driver support | |
70 | * but run with some shared drivers using pinctrl APIs. | |
71 | * After calling this function, the pinctrl core will return successfully | |
72 | * with creating a dummy state for the driver to keep going smoothly. | |
73 | */ | |
74 | void pinctrl_provide_dummies(void) | |
75 | { | |
76 | pinctrl_dummy_state = true; | |
77 | } | |
78 | ||
2744e8af LW |
79 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
80 | { | |
81 | /* We're not allowed to register devices without name */ | |
82 | return pctldev->desc->name; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
85 | ||
86 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) | |
87 | { | |
88 | return pctldev->driver_data; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
91 | ||
92 | /** | |
9dfac4fd LW |
93 | * get_pinctrl_dev_from_devname() - look up pin controller device |
94 | * @devname: the name of a device instance, as returned by dev_name() | |
2744e8af LW |
95 | * |
96 | * Looks up a pin control device matching a certain device name or pure device | |
97 | * pointer, the pure device pointer will take precedence. | |
98 | */ | |
9dfac4fd | 99 | struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
2744e8af LW |
100 | { |
101 | struct pinctrl_dev *pctldev = NULL; | |
102 | bool found = false; | |
103 | ||
9dfac4fd LW |
104 | if (!devname) |
105 | return NULL; | |
106 | ||
2744e8af | 107 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
9dfac4fd | 108 | if (!strcmp(dev_name(pctldev->dev), devname)) { |
2744e8af LW |
109 | /* Matched on device name */ |
110 | found = true; | |
111 | break; | |
112 | } | |
113 | } | |
2744e8af LW |
114 | |
115 | return found ? pctldev : NULL; | |
116 | } | |
117 | ||
ae6b4d85 LW |
118 | /** |
119 | * pin_get_from_name() - look up a pin number from a name | |
120 | * @pctldev: the pin control device to lookup the pin on | |
121 | * @name: the name of the pin to look up | |
122 | */ | |
123 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) | |
124 | { | |
706e8520 | 125 | unsigned i, pin; |
ae6b4d85 | 126 | |
706e8520 CP |
127 | /* The pin number can be retrived from the pin controller descriptor */ |
128 | for (i = 0; i < pctldev->desc->npins; i++) { | |
ae6b4d85 LW |
129 | struct pin_desc *desc; |
130 | ||
706e8520 | 131 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 LW |
132 | desc = pin_desc_get(pctldev, pin); |
133 | /* Pin space may be sparse */ | |
134 | if (desc == NULL) | |
135 | continue; | |
136 | if (desc->name && !strcmp(name, desc->name)) | |
137 | return pin; | |
138 | } | |
139 | ||
140 | return -EINVAL; | |
141 | } | |
142 | ||
dcb5dbc3 DA |
143 | /** |
144 | * pin_get_name_from_id() - look up a pin name from a pin id | |
145 | * @pctldev: the pin control device to lookup the pin on | |
146 | * @name: the name of the pin to look up | |
147 | */ | |
148 | const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin) | |
149 | { | |
150 | const struct pin_desc *desc; | |
151 | ||
152 | desc = pin_desc_get(pctldev, pin); | |
153 | if (desc == NULL) { | |
154 | dev_err(pctldev->dev, "failed to get pin(%d) name\n", | |
155 | pin); | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | return desc->name; | |
160 | } | |
161 | ||
2744e8af LW |
162 | /** |
163 | * pin_is_valid() - check if pin exists on controller | |
164 | * @pctldev: the pin control device to check the pin on | |
165 | * @pin: pin to check, use the local pin controller index number | |
166 | * | |
167 | * This tells us whether a certain pin exist on a certain pin controller or | |
168 | * not. Pin lists may be sparse, so some pins may not exist. | |
169 | */ | |
170 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
171 | { | |
172 | struct pin_desc *pindesc; | |
173 | ||
174 | if (pin < 0) | |
175 | return false; | |
176 | ||
57b676f9 | 177 | mutex_lock(&pinctrl_mutex); |
2744e8af | 178 | pindesc = pin_desc_get(pctldev, pin); |
57b676f9 | 179 | mutex_unlock(&pinctrl_mutex); |
2744e8af | 180 | |
57b676f9 | 181 | return pindesc != NULL; |
2744e8af LW |
182 | } |
183 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
184 | ||
185 | /* Deletes a range of pin descriptors */ | |
186 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
187 | const struct pinctrl_pin_desc *pins, | |
188 | unsigned num_pins) | |
189 | { | |
190 | int i; | |
191 | ||
2744e8af LW |
192 | for (i = 0; i < num_pins; i++) { |
193 | struct pin_desc *pindesc; | |
194 | ||
195 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
196 | pins[i].number); | |
197 | if (pindesc != NULL) { | |
198 | radix_tree_delete(&pctldev->pin_desc_tree, | |
199 | pins[i].number); | |
ca53c5f1 LW |
200 | if (pindesc->dynamic_name) |
201 | kfree(pindesc->name); | |
2744e8af LW |
202 | } |
203 | kfree(pindesc); | |
204 | } | |
2744e8af LW |
205 | } |
206 | ||
207 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
208 | unsigned number, const char *name) | |
209 | { | |
210 | struct pin_desc *pindesc; | |
211 | ||
212 | pindesc = pin_desc_get(pctldev, number); | |
213 | if (pindesc != NULL) { | |
214 | pr_err("pin %d already registered on %s\n", number, | |
215 | pctldev->desc->name); | |
216 | return -EINVAL; | |
217 | } | |
218 | ||
219 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
95dcd4ae SW |
220 | if (pindesc == NULL) { |
221 | dev_err(pctldev->dev, "failed to alloc struct pin_desc\n"); | |
2744e8af | 222 | return -ENOMEM; |
95dcd4ae | 223 | } |
ae6b4d85 | 224 | |
2744e8af LW |
225 | /* Set owner */ |
226 | pindesc->pctldev = pctldev; | |
227 | ||
9af1e44f | 228 | /* Copy basic pin info */ |
8dc6ae4d | 229 | if (name) { |
ca53c5f1 LW |
230 | pindesc->name = name; |
231 | } else { | |
232 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); | |
eb26cc9c SK |
233 | if (pindesc->name == NULL) { |
234 | kfree(pindesc); | |
ca53c5f1 | 235 | return -ENOMEM; |
eb26cc9c | 236 | } |
ca53c5f1 LW |
237 | pindesc->dynamic_name = true; |
238 | } | |
2744e8af | 239 | |
2744e8af | 240 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); |
2744e8af | 241 | pr_debug("registered pin %d (%s) on %s\n", |
ca53c5f1 | 242 | number, pindesc->name, pctldev->desc->name); |
2744e8af LW |
243 | return 0; |
244 | } | |
245 | ||
246 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
247 | struct pinctrl_pin_desc const *pins, | |
248 | unsigned num_descs) | |
249 | { | |
250 | unsigned i; | |
251 | int ret = 0; | |
252 | ||
253 | for (i = 0; i < num_descs; i++) { | |
254 | ret = pinctrl_register_one_pin(pctldev, | |
255 | pins[i].number, pins[i].name); | |
256 | if (ret) | |
257 | return ret; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | /** | |
264 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
265 | * @pctldev: pin controller device to check | |
266 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
267 | * | |
268 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
269 | * controller, return the range or NULL | |
270 | */ | |
271 | static struct pinctrl_gpio_range * | |
272 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
273 | { | |
274 | struct pinctrl_gpio_range *range = NULL; | |
275 | ||
276 | /* Loop over the ranges */ | |
2744e8af LW |
277 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
278 | /* Check if we're in the valid range */ | |
279 | if (gpio >= range->base && | |
280 | gpio < range->base + range->npins) { | |
2744e8af LW |
281 | return range; |
282 | } | |
283 | } | |
2744e8af LW |
284 | |
285 | return NULL; | |
286 | } | |
287 | ||
288 | /** | |
289 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
290 | * @gpio: the pin to locate the pin controller for | |
291 | * @outdev: the pin control device if found | |
292 | * @outrange: the GPIO range if found | |
293 | * | |
294 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
295 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
4650b7cb DA |
296 | * -EPROBE_DEFER if the GPIO range could not be found in any device since it |
297 | * may still have not been registered. | |
2744e8af | 298 | */ |
4ecce45d SW |
299 | static int pinctrl_get_device_gpio_range(unsigned gpio, |
300 | struct pinctrl_dev **outdev, | |
301 | struct pinctrl_gpio_range **outrange) | |
2744e8af LW |
302 | { |
303 | struct pinctrl_dev *pctldev = NULL; | |
304 | ||
305 | /* Loop over the pin controllers */ | |
2744e8af LW |
306 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
307 | struct pinctrl_gpio_range *range; | |
308 | ||
309 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
310 | if (range != NULL) { | |
311 | *outdev = pctldev; | |
312 | *outrange = range; | |
2744e8af LW |
313 | return 0; |
314 | } | |
315 | } | |
2744e8af | 316 | |
4650b7cb | 317 | return -EPROBE_DEFER; |
2744e8af LW |
318 | } |
319 | ||
320 | /** | |
321 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
322 | * @pctldev: pin controller device to add the range to | |
323 | * @range: the GPIO range to add | |
324 | * | |
325 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
326 | * this to register handled ranges after registering your pin controller. | |
327 | */ | |
328 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
329 | struct pinctrl_gpio_range *range) | |
330 | { | |
57b676f9 | 331 | mutex_lock(&pinctrl_mutex); |
8b9c139f | 332 | list_add_tail(&range->node, &pctldev->gpio_ranges); |
57b676f9 | 333 | mutex_unlock(&pinctrl_mutex); |
2744e8af | 334 | } |
4ecce45d | 335 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); |
2744e8af | 336 | |
3e5e00b6 DA |
337 | void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev, |
338 | struct pinctrl_gpio_range *ranges, | |
339 | unsigned nranges) | |
340 | { | |
341 | int i; | |
342 | ||
343 | for (i = 0; i < nranges; i++) | |
344 | pinctrl_add_gpio_range(pctldev, &ranges[i]); | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges); | |
347 | ||
192c369c | 348 | struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, |
f23f1516 SH |
349 | struct pinctrl_gpio_range *range) |
350 | { | |
351 | struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname); | |
352 | ||
dfa97515 LW |
353 | /* |
354 | * If we can't find this device, let's assume that is because | |
355 | * it has not probed yet, so the driver trying to register this | |
356 | * range need to defer probing. | |
357 | */ | |
f23f1516 | 358 | if (!pctldev) |
dfa97515 | 359 | return ERR_PTR(-EPROBE_DEFER); |
f23f1516 SH |
360 | |
361 | pinctrl_add_gpio_range(pctldev, range); | |
362 | return pctldev; | |
363 | } | |
192c369c | 364 | EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); |
f23f1516 | 365 | |
9afbefb2 LW |
366 | /** |
367 | * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin | |
368 | * @pctldev: the pin controller device to look in | |
369 | * @pin: a controller-local number to find the range for | |
370 | */ | |
371 | struct pinctrl_gpio_range * | |
372 | pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, | |
373 | unsigned int pin) | |
374 | { | |
375 | struct pinctrl_gpio_range *range = NULL; | |
376 | ||
377 | /* Loop over the ranges */ | |
378 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
379 | /* Check if we're in the valid range */ | |
380 | if (pin >= range->pin_base && | |
381 | pin < range->pin_base + range->npins) { | |
382 | return range; | |
383 | } | |
384 | } | |
385 | ||
386 | return NULL; | |
387 | } | |
388 | EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); | |
389 | ||
7e10ee68 VK |
390 | /** |
391 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
392 | * @pctldev: pin controller device to remove the range from | |
393 | * @range: the GPIO range to remove | |
394 | */ | |
395 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
396 | struct pinctrl_gpio_range *range) | |
397 | { | |
398 | mutex_lock(&pinctrl_mutex); | |
399 | list_del(&range->node); | |
400 | mutex_unlock(&pinctrl_mutex); | |
401 | } | |
402 | EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); | |
403 | ||
7afde8ba LW |
404 | /** |
405 | * pinctrl_get_group_selector() - returns the group selector for a group | |
406 | * @pctldev: the pin controller handling the group | |
407 | * @pin_group: the pin group to look up | |
408 | */ | |
409 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, | |
410 | const char *pin_group) | |
411 | { | |
412 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
d1e90e9e | 413 | unsigned ngroups = pctlops->get_groups_count(pctldev); |
7afde8ba LW |
414 | unsigned group_selector = 0; |
415 | ||
d1e90e9e | 416 | while (group_selector < ngroups) { |
7afde8ba LW |
417 | const char *gname = pctlops->get_group_name(pctldev, |
418 | group_selector); | |
419 | if (!strcmp(gname, pin_group)) { | |
51cd24ee | 420 | dev_dbg(pctldev->dev, |
7afde8ba LW |
421 | "found group selector %u for %s\n", |
422 | group_selector, | |
423 | pin_group); | |
424 | return group_selector; | |
425 | } | |
426 | ||
427 | group_selector++; | |
428 | } | |
429 | ||
51cd24ee | 430 | dev_err(pctldev->dev, "does not have pin group %s\n", |
7afde8ba LW |
431 | pin_group); |
432 | ||
433 | return -EINVAL; | |
434 | } | |
435 | ||
befe5bdf LW |
436 | /** |
437 | * pinctrl_request_gpio() - request a single pin to be used in as GPIO | |
438 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
439 | * | |
440 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
441 | * as part of their gpio_request() semantics, platforms and individual drivers | |
442 | * shall *NOT* request GPIO pins to be muxed in. | |
443 | */ | |
444 | int pinctrl_request_gpio(unsigned gpio) | |
445 | { | |
446 | struct pinctrl_dev *pctldev; | |
447 | struct pinctrl_gpio_range *range; | |
448 | int ret; | |
449 | int pin; | |
450 | ||
57b676f9 SW |
451 | mutex_lock(&pinctrl_mutex); |
452 | ||
befe5bdf | 453 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
57b676f9 SW |
454 | if (ret) { |
455 | mutex_unlock(&pinctrl_mutex); | |
4650b7cb | 456 | return ret; |
57b676f9 | 457 | } |
befe5bdf LW |
458 | |
459 | /* Convert to the pin controllers number space */ | |
460 | pin = gpio - range->base + range->pin_base; | |
461 | ||
57b676f9 SW |
462 | ret = pinmux_request_gpio(pctldev, range, pin, gpio); |
463 | ||
464 | mutex_unlock(&pinctrl_mutex); | |
465 | return ret; | |
befe5bdf LW |
466 | } |
467 | EXPORT_SYMBOL_GPL(pinctrl_request_gpio); | |
468 | ||
469 | /** | |
470 | * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO | |
471 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
472 | * | |
473 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
474 | * as part of their gpio_free() semantics, platforms and individual drivers | |
475 | * shall *NOT* request GPIO pins to be muxed out. | |
476 | */ | |
477 | void pinctrl_free_gpio(unsigned gpio) | |
478 | { | |
479 | struct pinctrl_dev *pctldev; | |
480 | struct pinctrl_gpio_range *range; | |
481 | int ret; | |
482 | int pin; | |
483 | ||
57b676f9 SW |
484 | mutex_lock(&pinctrl_mutex); |
485 | ||
befe5bdf | 486 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
57b676f9 SW |
487 | if (ret) { |
488 | mutex_unlock(&pinctrl_mutex); | |
befe5bdf | 489 | return; |
57b676f9 | 490 | } |
befe5bdf LW |
491 | |
492 | /* Convert to the pin controllers number space */ | |
493 | pin = gpio - range->base + range->pin_base; | |
494 | ||
57b676f9 SW |
495 | pinmux_free_gpio(pctldev, pin, range); |
496 | ||
497 | mutex_unlock(&pinctrl_mutex); | |
befe5bdf LW |
498 | } |
499 | EXPORT_SYMBOL_GPL(pinctrl_free_gpio); | |
500 | ||
501 | static int pinctrl_gpio_direction(unsigned gpio, bool input) | |
502 | { | |
503 | struct pinctrl_dev *pctldev; | |
504 | struct pinctrl_gpio_range *range; | |
505 | int ret; | |
506 | int pin; | |
507 | ||
508 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
509 | if (ret) | |
510 | return ret; | |
511 | ||
512 | /* Convert to the pin controllers number space */ | |
513 | pin = gpio - range->base + range->pin_base; | |
514 | ||
515 | return pinmux_gpio_direction(pctldev, range, pin, input); | |
516 | } | |
517 | ||
518 | /** | |
519 | * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode | |
520 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
521 | * | |
522 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
523 | * as part of their gpio_direction_input() semantics, platforms and individual | |
524 | * drivers shall *NOT* touch pin control GPIO calls. | |
525 | */ | |
526 | int pinctrl_gpio_direction_input(unsigned gpio) | |
527 | { | |
57b676f9 SW |
528 | int ret; |
529 | mutex_lock(&pinctrl_mutex); | |
530 | ret = pinctrl_gpio_direction(gpio, true); | |
531 | mutex_unlock(&pinctrl_mutex); | |
532 | return ret; | |
befe5bdf LW |
533 | } |
534 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); | |
535 | ||
536 | /** | |
537 | * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode | |
538 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
539 | * | |
540 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
541 | * as part of their gpio_direction_output() semantics, platforms and individual | |
542 | * drivers shall *NOT* touch pin control GPIO calls. | |
543 | */ | |
544 | int pinctrl_gpio_direction_output(unsigned gpio) | |
545 | { | |
57b676f9 SW |
546 | int ret; |
547 | mutex_lock(&pinctrl_mutex); | |
548 | ret = pinctrl_gpio_direction(gpio, false); | |
549 | mutex_unlock(&pinctrl_mutex); | |
550 | return ret; | |
befe5bdf LW |
551 | } |
552 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); | |
553 | ||
6e5e959d SW |
554 | static struct pinctrl_state *find_state(struct pinctrl *p, |
555 | const char *name) | |
befe5bdf | 556 | { |
6e5e959d SW |
557 | struct pinctrl_state *state; |
558 | ||
559 | list_for_each_entry(state, &p->states, node) | |
560 | if (!strcmp(state->name, name)) | |
561 | return state; | |
562 | ||
563 | return NULL; | |
564 | } | |
565 | ||
566 | static struct pinctrl_state *create_state(struct pinctrl *p, | |
567 | const char *name) | |
568 | { | |
569 | struct pinctrl_state *state; | |
570 | ||
571 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
572 | if (state == NULL) { | |
573 | dev_err(p->dev, | |
574 | "failed to alloc struct pinctrl_state\n"); | |
575 | return ERR_PTR(-ENOMEM); | |
576 | } | |
577 | ||
578 | state->name = name; | |
579 | INIT_LIST_HEAD(&state->settings); | |
580 | ||
581 | list_add_tail(&state->node, &p->states); | |
582 | ||
583 | return state; | |
584 | } | |
585 | ||
586 | static int add_setting(struct pinctrl *p, struct pinctrl_map const *map) | |
587 | { | |
588 | struct pinctrl_state *state; | |
7ecdb16f | 589 | struct pinctrl_setting *setting; |
6e5e959d | 590 | int ret; |
befe5bdf | 591 | |
6e5e959d SW |
592 | state = find_state(p, map->name); |
593 | if (!state) | |
594 | state = create_state(p, map->name); | |
595 | if (IS_ERR(state)) | |
596 | return PTR_ERR(state); | |
befe5bdf | 597 | |
1e2082b5 SW |
598 | if (map->type == PIN_MAP_TYPE_DUMMY_STATE) |
599 | return 0; | |
600 | ||
6e5e959d SW |
601 | setting = kzalloc(sizeof(*setting), GFP_KERNEL); |
602 | if (setting == NULL) { | |
603 | dev_err(p->dev, | |
604 | "failed to alloc struct pinctrl_setting\n"); | |
605 | return -ENOMEM; | |
606 | } | |
befe5bdf | 607 | |
1e2082b5 SW |
608 | setting->type = map->type; |
609 | ||
6e5e959d SW |
610 | setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
611 | if (setting->pctldev == NULL) { | |
c05127c4 | 612 | dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", |
6e5e959d SW |
613 | map->ctrl_dev_name); |
614 | kfree(setting); | |
c05127c4 LW |
615 | /* |
616 | * OK let us guess that the driver is not there yet, and | |
617 | * let's defer obtaining this pinctrl handle to later... | |
618 | */ | |
619 | return -EPROBE_DEFER; | |
6e5e959d SW |
620 | } |
621 | ||
1a78958d LW |
622 | setting->dev_name = map->dev_name; |
623 | ||
1e2082b5 SW |
624 | switch (map->type) { |
625 | case PIN_MAP_TYPE_MUX_GROUP: | |
626 | ret = pinmux_map_to_setting(map, setting); | |
627 | break; | |
628 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
629 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
630 | ret = pinconf_map_to_setting(map, setting); | |
631 | break; | |
632 | default: | |
633 | ret = -EINVAL; | |
634 | break; | |
635 | } | |
6e5e959d SW |
636 | if (ret < 0) { |
637 | kfree(setting); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | list_add_tail(&setting->node, &state->settings); | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static struct pinctrl *find_pinctrl(struct device *dev) | |
647 | { | |
648 | struct pinctrl *p; | |
649 | ||
1e2082b5 | 650 | list_for_each_entry(p, &pinctrl_list, node) |
6e5e959d SW |
651 | if (p->dev == dev) |
652 | return p; | |
653 | ||
654 | return NULL; | |
655 | } | |
656 | ||
657 | static void pinctrl_put_locked(struct pinctrl *p, bool inlist); | |
658 | ||
659 | static struct pinctrl *create_pinctrl(struct device *dev) | |
660 | { | |
661 | struct pinctrl *p; | |
662 | const char *devname; | |
663 | struct pinctrl_maps *maps_node; | |
664 | int i; | |
665 | struct pinctrl_map const *map; | |
666 | int ret; | |
befe5bdf LW |
667 | |
668 | /* | |
669 | * create the state cookie holder struct pinctrl for each | |
670 | * mapping, this is what consumers will get when requesting | |
671 | * a pin control handle with pinctrl_get() | |
672 | */ | |
02f5b989 | 673 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
95dcd4ae SW |
674 | if (p == NULL) { |
675 | dev_err(dev, "failed to alloc struct pinctrl\n"); | |
befe5bdf | 676 | return ERR_PTR(-ENOMEM); |
95dcd4ae | 677 | } |
7ecdb16f | 678 | p->dev = dev; |
6e5e959d | 679 | INIT_LIST_HEAD(&p->states); |
57291ce2 SW |
680 | INIT_LIST_HEAD(&p->dt_maps); |
681 | ||
682 | ret = pinctrl_dt_to_map(p); | |
683 | if (ret < 0) { | |
684 | kfree(p); | |
685 | return ERR_PTR(ret); | |
686 | } | |
6e5e959d SW |
687 | |
688 | devname = dev_name(dev); | |
befe5bdf LW |
689 | |
690 | /* Iterate over the pin control maps to locate the right ones */ | |
b2b3e66e | 691 | for_each_maps(maps_node, i, map) { |
7ecdb16f SW |
692 | /* Map must be for this device */ |
693 | if (strcmp(map->dev_name, devname)) | |
694 | continue; | |
695 | ||
6e5e959d SW |
696 | ret = add_setting(p, map); |
697 | if (ret < 0) { | |
698 | pinctrl_put_locked(p, false); | |
699 | return ERR_PTR(ret); | |
7ecdb16f | 700 | } |
befe5bdf LW |
701 | } |
702 | ||
b0666ba4 | 703 | /* Add the pinctrl handle to the global list */ |
8b9c139f | 704 | list_add_tail(&p->node, &pinctrl_list); |
befe5bdf LW |
705 | |
706 | return p; | |
6e5e959d | 707 | } |
7ecdb16f | 708 | |
6e5e959d SW |
709 | static struct pinctrl *pinctrl_get_locked(struct device *dev) |
710 | { | |
711 | struct pinctrl *p; | |
7ecdb16f | 712 | |
6e5e959d SW |
713 | if (WARN_ON(!dev)) |
714 | return ERR_PTR(-EINVAL); | |
715 | ||
716 | p = find_pinctrl(dev); | |
717 | if (p != NULL) | |
718 | return ERR_PTR(-EBUSY); | |
7ecdb16f | 719 | |
d599bfb3 | 720 | return create_pinctrl(dev); |
befe5bdf | 721 | } |
b2b3e66e SW |
722 | |
723 | /** | |
6e5e959d SW |
724 | * pinctrl_get() - retrieves the pinctrl handle for a device |
725 | * @dev: the device to obtain the handle for | |
b2b3e66e | 726 | */ |
6e5e959d | 727 | struct pinctrl *pinctrl_get(struct device *dev) |
b2b3e66e SW |
728 | { |
729 | struct pinctrl *p; | |
730 | ||
57b676f9 | 731 | mutex_lock(&pinctrl_mutex); |
6e5e959d | 732 | p = pinctrl_get_locked(dev); |
57b676f9 | 733 | mutex_unlock(&pinctrl_mutex); |
b2b3e66e SW |
734 | |
735 | return p; | |
736 | } | |
befe5bdf LW |
737 | EXPORT_SYMBOL_GPL(pinctrl_get); |
738 | ||
6e5e959d | 739 | static void pinctrl_put_locked(struct pinctrl *p, bool inlist) |
befe5bdf | 740 | { |
6e5e959d SW |
741 | struct pinctrl_state *state, *n1; |
742 | struct pinctrl_setting *setting, *n2; | |
743 | ||
744 | list_for_each_entry_safe(state, n1, &p->states, node) { | |
745 | list_for_each_entry_safe(setting, n2, &state->settings, node) { | |
1e2082b5 SW |
746 | switch (setting->type) { |
747 | case PIN_MAP_TYPE_MUX_GROUP: | |
748 | if (state == p->state) | |
749 | pinmux_disable_setting(setting); | |
750 | pinmux_free_setting(setting); | |
751 | break; | |
752 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
753 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
754 | pinconf_free_setting(setting); | |
755 | break; | |
756 | default: | |
757 | break; | |
758 | } | |
6e5e959d SW |
759 | list_del(&setting->node); |
760 | kfree(setting); | |
761 | } | |
762 | list_del(&state->node); | |
763 | kfree(state); | |
7ecdb16f | 764 | } |
befe5bdf | 765 | |
57291ce2 SW |
766 | pinctrl_dt_free_maps(p); |
767 | ||
6e5e959d SW |
768 | if (inlist) |
769 | list_del(&p->node); | |
befe5bdf LW |
770 | kfree(p); |
771 | } | |
befe5bdf LW |
772 | |
773 | /** | |
6e5e959d SW |
774 | * pinctrl_put() - release a previously claimed pinctrl handle |
775 | * @p: the pinctrl handle to release | |
befe5bdf | 776 | */ |
57b676f9 SW |
777 | void pinctrl_put(struct pinctrl *p) |
778 | { | |
779 | mutex_lock(&pinctrl_mutex); | |
6e5e959d | 780 | pinctrl_put_locked(p, true); |
57b676f9 SW |
781 | mutex_unlock(&pinctrl_mutex); |
782 | } | |
783 | EXPORT_SYMBOL_GPL(pinctrl_put); | |
784 | ||
6e5e959d SW |
785 | static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p, |
786 | const char *name) | |
befe5bdf | 787 | { |
6e5e959d | 788 | struct pinctrl_state *state; |
befe5bdf | 789 | |
6e5e959d | 790 | state = find_state(p, name); |
5b3aa5f7 DA |
791 | if (!state) { |
792 | if (pinctrl_dummy_state) { | |
793 | /* create dummy state */ | |
794 | dev_dbg(p->dev, "using pinctrl dummy state (%s)\n", | |
795 | name); | |
796 | state = create_state(p, name); | |
d599bfb3 RG |
797 | } else |
798 | state = ERR_PTR(-ENODEV); | |
5b3aa5f7 | 799 | } |
57b676f9 | 800 | |
6e5e959d | 801 | return state; |
befe5bdf | 802 | } |
befe5bdf LW |
803 | |
804 | /** | |
6e5e959d SW |
805 | * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle |
806 | * @p: the pinctrl handle to retrieve the state from | |
807 | * @name: the state name to retrieve | |
befe5bdf | 808 | */ |
6e5e959d | 809 | struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name) |
57b676f9 | 810 | { |
6e5e959d SW |
811 | struct pinctrl_state *s; |
812 | ||
57b676f9 | 813 | mutex_lock(&pinctrl_mutex); |
6e5e959d | 814 | s = pinctrl_lookup_state_locked(p, name); |
57b676f9 | 815 | mutex_unlock(&pinctrl_mutex); |
6e5e959d SW |
816 | |
817 | return s; | |
57b676f9 | 818 | } |
6e5e959d | 819 | EXPORT_SYMBOL_GPL(pinctrl_lookup_state); |
57b676f9 | 820 | |
6e5e959d SW |
821 | static int pinctrl_select_state_locked(struct pinctrl *p, |
822 | struct pinctrl_state *state) | |
befe5bdf | 823 | { |
6e5e959d SW |
824 | struct pinctrl_setting *setting, *setting2; |
825 | int ret; | |
7ecdb16f | 826 | |
6e5e959d SW |
827 | if (p->state == state) |
828 | return 0; | |
befe5bdf | 829 | |
6e5e959d SW |
830 | if (p->state) { |
831 | /* | |
832 | * The set of groups with a mux configuration in the old state | |
833 | * may not be identical to the set of groups with a mux setting | |
834 | * in the new state. While this might be unusual, it's entirely | |
835 | * possible for the "user"-supplied mapping table to be written | |
836 | * that way. For each group that was configured in the old state | |
837 | * but not in the new state, this code puts that group into a | |
838 | * safe/disabled state. | |
839 | */ | |
840 | list_for_each_entry(setting, &p->state->settings, node) { | |
841 | bool found = false; | |
1e2082b5 SW |
842 | if (setting->type != PIN_MAP_TYPE_MUX_GROUP) |
843 | continue; | |
6e5e959d | 844 | list_for_each_entry(setting2, &state->settings, node) { |
1e2082b5 SW |
845 | if (setting2->type != PIN_MAP_TYPE_MUX_GROUP) |
846 | continue; | |
847 | if (setting2->data.mux.group == | |
848 | setting->data.mux.group) { | |
6e5e959d SW |
849 | found = true; |
850 | break; | |
851 | } | |
852 | } | |
853 | if (!found) | |
854 | pinmux_disable_setting(setting); | |
855 | } | |
856 | } | |
857 | ||
858 | p->state = state; | |
859 | ||
860 | /* Apply all the settings for the new state */ | |
861 | list_for_each_entry(setting, &state->settings, node) { | |
1e2082b5 SW |
862 | switch (setting->type) { |
863 | case PIN_MAP_TYPE_MUX_GROUP: | |
864 | ret = pinmux_enable_setting(setting); | |
865 | break; | |
866 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
867 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
868 | ret = pinconf_apply_setting(setting); | |
869 | break; | |
870 | default: | |
871 | ret = -EINVAL; | |
872 | break; | |
873 | } | |
6e5e959d SW |
874 | if (ret < 0) { |
875 | /* FIXME: Difficult to return to prev state */ | |
876 | return ret; | |
877 | } | |
befe5bdf | 878 | } |
6e5e959d SW |
879 | |
880 | return 0; | |
57b676f9 SW |
881 | } |
882 | ||
883 | /** | |
6e5e959d SW |
884 | * pinctrl_select() - select/activate/program a pinctrl state to HW |
885 | * @p: the pinctrl handle for the device that requests configuratio | |
886 | * @state: the state handle to select/activate/program | |
57b676f9 | 887 | */ |
6e5e959d | 888 | int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) |
57b676f9 | 889 | { |
6e5e959d SW |
890 | int ret; |
891 | ||
57b676f9 | 892 | mutex_lock(&pinctrl_mutex); |
6e5e959d | 893 | ret = pinctrl_select_state_locked(p, state); |
57b676f9 | 894 | mutex_unlock(&pinctrl_mutex); |
6e5e959d SW |
895 | |
896 | return ret; | |
befe5bdf | 897 | } |
6e5e959d | 898 | EXPORT_SYMBOL_GPL(pinctrl_select_state); |
befe5bdf | 899 | |
6d4ca1fb SW |
900 | static void devm_pinctrl_release(struct device *dev, void *res) |
901 | { | |
902 | pinctrl_put(*(struct pinctrl **)res); | |
903 | } | |
904 | ||
905 | /** | |
906 | * struct devm_pinctrl_get() - Resource managed pinctrl_get() | |
907 | * @dev: the device to obtain the handle for | |
908 | * | |
909 | * If there is a need to explicitly destroy the returned struct pinctrl, | |
910 | * devm_pinctrl_put() should be used, rather than plain pinctrl_put(). | |
911 | */ | |
912 | struct pinctrl *devm_pinctrl_get(struct device *dev) | |
913 | { | |
914 | struct pinctrl **ptr, *p; | |
915 | ||
916 | ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); | |
917 | if (!ptr) | |
918 | return ERR_PTR(-ENOMEM); | |
919 | ||
920 | p = pinctrl_get(dev); | |
921 | if (!IS_ERR(p)) { | |
922 | *ptr = p; | |
923 | devres_add(dev, ptr); | |
924 | } else { | |
925 | devres_free(ptr); | |
926 | } | |
927 | ||
928 | return p; | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(devm_pinctrl_get); | |
931 | ||
932 | static int devm_pinctrl_match(struct device *dev, void *res, void *data) | |
933 | { | |
934 | struct pinctrl **p = res; | |
935 | ||
936 | return *p == data; | |
937 | } | |
938 | ||
939 | /** | |
940 | * devm_pinctrl_put() - Resource managed pinctrl_put() | |
941 | * @p: the pinctrl handle to release | |
942 | * | |
943 | * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally | |
944 | * this function will not need to be called and the resource management | |
945 | * code will ensure that the resource is freed. | |
946 | */ | |
947 | void devm_pinctrl_put(struct pinctrl *p) | |
948 | { | |
949 | WARN_ON(devres_destroy(p->dev, devm_pinctrl_release, | |
950 | devm_pinctrl_match, p)); | |
951 | pinctrl_put(p); | |
952 | } | |
953 | EXPORT_SYMBOL_GPL(devm_pinctrl_put); | |
954 | ||
57291ce2 SW |
955 | int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, |
956 | bool dup, bool locked) | |
befe5bdf | 957 | { |
1e2082b5 | 958 | int i, ret; |
b2b3e66e | 959 | struct pinctrl_maps *maps_node; |
befe5bdf LW |
960 | |
961 | pr_debug("add %d pinmux maps\n", num_maps); | |
962 | ||
963 | /* First sanity check the new mapping */ | |
964 | for (i = 0; i < num_maps; i++) { | |
1e2082b5 SW |
965 | if (!maps[i].dev_name) { |
966 | pr_err("failed to register map %s (%d): no device given\n", | |
967 | maps[i].name, i); | |
968 | return -EINVAL; | |
969 | } | |
970 | ||
befe5bdf LW |
971 | if (!maps[i].name) { |
972 | pr_err("failed to register map %d: no map name given\n", | |
95dcd4ae | 973 | i); |
befe5bdf LW |
974 | return -EINVAL; |
975 | } | |
976 | ||
1e2082b5 SW |
977 | if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && |
978 | !maps[i].ctrl_dev_name) { | |
befe5bdf LW |
979 | pr_err("failed to register map %s (%d): no pin control device given\n", |
980 | maps[i].name, i); | |
981 | return -EINVAL; | |
982 | } | |
983 | ||
1e2082b5 SW |
984 | switch (maps[i].type) { |
985 | case PIN_MAP_TYPE_DUMMY_STATE: | |
986 | break; | |
987 | case PIN_MAP_TYPE_MUX_GROUP: | |
988 | ret = pinmux_validate_map(&maps[i], i); | |
989 | if (ret < 0) | |
fde04f41 | 990 | return ret; |
1e2082b5 SW |
991 | break; |
992 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
993 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
994 | ret = pinconf_validate_map(&maps[i], i); | |
995 | if (ret < 0) | |
fde04f41 | 996 | return ret; |
1e2082b5 SW |
997 | break; |
998 | default: | |
999 | pr_err("failed to register map %s (%d): invalid type given\n", | |
95dcd4ae | 1000 | maps[i].name, i); |
1681f5ae SW |
1001 | return -EINVAL; |
1002 | } | |
befe5bdf LW |
1003 | } |
1004 | ||
b2b3e66e SW |
1005 | maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
1006 | if (!maps_node) { | |
1007 | pr_err("failed to alloc struct pinctrl_maps\n"); | |
1008 | return -ENOMEM; | |
1009 | } | |
befe5bdf | 1010 | |
b2b3e66e | 1011 | maps_node->num_maps = num_maps; |
57291ce2 SW |
1012 | if (dup) { |
1013 | maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, | |
1014 | GFP_KERNEL); | |
1015 | if (!maps_node->maps) { | |
1016 | pr_err("failed to duplicate mapping table\n"); | |
1017 | kfree(maps_node); | |
1018 | return -ENOMEM; | |
1019 | } | |
1020 | } else { | |
1021 | maps_node->maps = maps; | |
befe5bdf LW |
1022 | } |
1023 | ||
57291ce2 SW |
1024 | if (!locked) |
1025 | mutex_lock(&pinctrl_mutex); | |
b2b3e66e | 1026 | list_add_tail(&maps_node->node, &pinctrl_maps); |
57291ce2 SW |
1027 | if (!locked) |
1028 | mutex_unlock(&pinctrl_mutex); | |
b2b3e66e | 1029 | |
befe5bdf LW |
1030 | return 0; |
1031 | } | |
1032 | ||
57291ce2 SW |
1033 | /** |
1034 | * pinctrl_register_mappings() - register a set of pin controller mappings | |
1035 | * @maps: the pincontrol mappings table to register. This should probably be | |
1036 | * marked with __initdata so it can be discarded after boot. This | |
1037 | * function will perform a shallow copy for the mapping entries. | |
1038 | * @num_maps: the number of maps in the mapping table | |
1039 | */ | |
1040 | int pinctrl_register_mappings(struct pinctrl_map const *maps, | |
1041 | unsigned num_maps) | |
1042 | { | |
1043 | return pinctrl_register_map(maps, num_maps, true, false); | |
1044 | } | |
1045 | ||
1046 | void pinctrl_unregister_map(struct pinctrl_map const *map) | |
1047 | { | |
1048 | struct pinctrl_maps *maps_node; | |
1049 | ||
1050 | list_for_each_entry(maps_node, &pinctrl_maps, node) { | |
1051 | if (maps_node->maps == map) { | |
1052 | list_del(&maps_node->node); | |
1053 | return; | |
1054 | } | |
1055 | } | |
1056 | } | |
1057 | ||
2744e8af LW |
1058 | #ifdef CONFIG_DEBUG_FS |
1059 | ||
1060 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
1061 | { | |
1062 | struct pinctrl_dev *pctldev = s->private; | |
1063 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
706e8520 | 1064 | unsigned i, pin; |
2744e8af LW |
1065 | |
1066 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
2744e8af | 1067 | |
57b676f9 SW |
1068 | mutex_lock(&pinctrl_mutex); |
1069 | ||
706e8520 CP |
1070 | /* The pin number can be retrived from the pin controller descriptor */ |
1071 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
1072 | struct pin_desc *desc; |
1073 | ||
706e8520 | 1074 | pin = pctldev->desc->pins[i].number; |
2744e8af LW |
1075 | desc = pin_desc_get(pctldev, pin); |
1076 | /* Pin space may be sparse */ | |
1077 | if (desc == NULL) | |
1078 | continue; | |
1079 | ||
1080 | seq_printf(s, "pin %d (%s) ", pin, | |
1081 | desc->name ? desc->name : "unnamed"); | |
1082 | ||
1083 | /* Driver-specific info per pin */ | |
1084 | if (ops->pin_dbg_show) | |
1085 | ops->pin_dbg_show(pctldev, s, pin); | |
1086 | ||
1087 | seq_puts(s, "\n"); | |
1088 | } | |
1089 | ||
57b676f9 SW |
1090 | mutex_unlock(&pinctrl_mutex); |
1091 | ||
2744e8af LW |
1092 | return 0; |
1093 | } | |
1094 | ||
1095 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
1096 | { | |
1097 | struct pinctrl_dev *pctldev = s->private; | |
1098 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
d1e90e9e | 1099 | unsigned ngroups, selector = 0; |
2744e8af | 1100 | |
d1e90e9e | 1101 | ngroups = ops->get_groups_count(pctldev); |
57b676f9 SW |
1102 | mutex_lock(&pinctrl_mutex); |
1103 | ||
2744e8af | 1104 | seq_puts(s, "registered pin groups:\n"); |
d1e90e9e | 1105 | while (selector < ngroups) { |
a5818a8b | 1106 | const unsigned *pins; |
2744e8af LW |
1107 | unsigned num_pins; |
1108 | const char *gname = ops->get_group_name(pctldev, selector); | |
dcb5dbc3 | 1109 | const char *pname; |
2744e8af LW |
1110 | int ret; |
1111 | int i; | |
1112 | ||
1113 | ret = ops->get_group_pins(pctldev, selector, | |
1114 | &pins, &num_pins); | |
1115 | if (ret) | |
1116 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
1117 | gname); | |
1118 | else { | |
dcb5dbc3 DA |
1119 | seq_printf(s, "group: %s\n", gname); |
1120 | for (i = 0; i < num_pins; i++) { | |
1121 | pname = pin_get_name(pctldev, pins[i]); | |
b4dd784b WY |
1122 | if (WARN_ON(!pname)) { |
1123 | mutex_unlock(&pinctrl_mutex); | |
dcb5dbc3 | 1124 | return -EINVAL; |
b4dd784b | 1125 | } |
dcb5dbc3 DA |
1126 | seq_printf(s, "pin %d (%s)\n", pins[i], pname); |
1127 | } | |
1128 | seq_puts(s, "\n"); | |
2744e8af LW |
1129 | } |
1130 | selector++; | |
1131 | } | |
1132 | ||
57b676f9 | 1133 | mutex_unlock(&pinctrl_mutex); |
2744e8af LW |
1134 | |
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
1139 | { | |
1140 | struct pinctrl_dev *pctldev = s->private; | |
1141 | struct pinctrl_gpio_range *range = NULL; | |
1142 | ||
1143 | seq_puts(s, "GPIO ranges handled:\n"); | |
1144 | ||
57b676f9 SW |
1145 | mutex_lock(&pinctrl_mutex); |
1146 | ||
2744e8af | 1147 | /* Loop over the ranges */ |
2744e8af | 1148 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
75d6642a LW |
1149 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
1150 | range->id, range->name, | |
1151 | range->base, (range->base + range->npins - 1), | |
1152 | range->pin_base, | |
1153 | (range->pin_base + range->npins - 1)); | |
2744e8af | 1154 | } |
57b676f9 SW |
1155 | |
1156 | mutex_unlock(&pinctrl_mutex); | |
2744e8af LW |
1157 | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static int pinctrl_devices_show(struct seq_file *s, void *what) | |
1162 | { | |
1163 | struct pinctrl_dev *pctldev; | |
1164 | ||
ae6b4d85 | 1165 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
57b676f9 SW |
1166 | |
1167 | mutex_lock(&pinctrl_mutex); | |
1168 | ||
2744e8af LW |
1169 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
1170 | seq_printf(s, "%s ", pctldev->desc->name); | |
1171 | if (pctldev->desc->pmxops) | |
ae6b4d85 LW |
1172 | seq_puts(s, "yes "); |
1173 | else | |
1174 | seq_puts(s, "no "); | |
1175 | if (pctldev->desc->confops) | |
2744e8af LW |
1176 | seq_puts(s, "yes"); |
1177 | else | |
1178 | seq_puts(s, "no"); | |
1179 | seq_puts(s, "\n"); | |
1180 | } | |
57b676f9 SW |
1181 | |
1182 | mutex_unlock(&pinctrl_mutex); | |
2744e8af LW |
1183 | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1e2082b5 SW |
1187 | static inline const char *map_type(enum pinctrl_map_type type) |
1188 | { | |
1189 | static const char * const names[] = { | |
1190 | "INVALID", | |
1191 | "DUMMY_STATE", | |
1192 | "MUX_GROUP", | |
1193 | "CONFIGS_PIN", | |
1194 | "CONFIGS_GROUP", | |
1195 | }; | |
1196 | ||
1197 | if (type >= ARRAY_SIZE(names)) | |
1198 | return "UNKNOWN"; | |
1199 | ||
1200 | return names[type]; | |
1201 | } | |
1202 | ||
3eedb437 SW |
1203 | static int pinctrl_maps_show(struct seq_file *s, void *what) |
1204 | { | |
1205 | struct pinctrl_maps *maps_node; | |
1206 | int i; | |
1207 | struct pinctrl_map const *map; | |
1208 | ||
1209 | seq_puts(s, "Pinctrl maps:\n"); | |
1210 | ||
57b676f9 SW |
1211 | mutex_lock(&pinctrl_mutex); |
1212 | ||
3eedb437 | 1213 | for_each_maps(maps_node, i, map) { |
1e2082b5 SW |
1214 | seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", |
1215 | map->dev_name, map->name, map_type(map->type), | |
1216 | map->type); | |
1217 | ||
1218 | if (map->type != PIN_MAP_TYPE_DUMMY_STATE) | |
1219 | seq_printf(s, "controlling device %s\n", | |
1220 | map->ctrl_dev_name); | |
1221 | ||
1222 | switch (map->type) { | |
1223 | case PIN_MAP_TYPE_MUX_GROUP: | |
1224 | pinmux_show_map(s, map); | |
1225 | break; | |
1226 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
1227 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
1228 | pinconf_show_map(s, map); | |
1229 | break; | |
1230 | default: | |
1231 | break; | |
1232 | } | |
1233 | ||
1234 | seq_printf(s, "\n"); | |
3eedb437 | 1235 | } |
57b676f9 SW |
1236 | |
1237 | mutex_unlock(&pinctrl_mutex); | |
3eedb437 SW |
1238 | |
1239 | return 0; | |
1240 | } | |
1241 | ||
befe5bdf LW |
1242 | static int pinctrl_show(struct seq_file *s, void *what) |
1243 | { | |
1244 | struct pinctrl *p; | |
6e5e959d | 1245 | struct pinctrl_state *state; |
7ecdb16f | 1246 | struct pinctrl_setting *setting; |
befe5bdf LW |
1247 | |
1248 | seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); | |
57b676f9 SW |
1249 | |
1250 | mutex_lock(&pinctrl_mutex); | |
1251 | ||
befe5bdf | 1252 | list_for_each_entry(p, &pinctrl_list, node) { |
6e5e959d SW |
1253 | seq_printf(s, "device: %s current state: %s\n", |
1254 | dev_name(p->dev), | |
1255 | p->state ? p->state->name : "none"); | |
1256 | ||
1257 | list_for_each_entry(state, &p->states, node) { | |
1258 | seq_printf(s, " state: %s\n", state->name); | |
befe5bdf | 1259 | |
6e5e959d | 1260 | list_for_each_entry(setting, &state->settings, node) { |
1e2082b5 SW |
1261 | struct pinctrl_dev *pctldev = setting->pctldev; |
1262 | ||
1263 | seq_printf(s, " type: %s controller %s ", | |
1264 | map_type(setting->type), | |
1265 | pinctrl_dev_get_name(pctldev)); | |
1266 | ||
1267 | switch (setting->type) { | |
1268 | case PIN_MAP_TYPE_MUX_GROUP: | |
1269 | pinmux_show_setting(s, setting); | |
1270 | break; | |
1271 | case PIN_MAP_TYPE_CONFIGS_PIN: | |
1272 | case PIN_MAP_TYPE_CONFIGS_GROUP: | |
1273 | pinconf_show_setting(s, setting); | |
1274 | break; | |
1275 | default: | |
1276 | break; | |
1277 | } | |
6e5e959d | 1278 | } |
befe5bdf | 1279 | } |
befe5bdf LW |
1280 | } |
1281 | ||
57b676f9 SW |
1282 | mutex_unlock(&pinctrl_mutex); |
1283 | ||
befe5bdf LW |
1284 | return 0; |
1285 | } | |
1286 | ||
2744e8af LW |
1287 | static int pinctrl_pins_open(struct inode *inode, struct file *file) |
1288 | { | |
1289 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
1290 | } | |
1291 | ||
1292 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
1293 | { | |
1294 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
1295 | } | |
1296 | ||
1297 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
1298 | { | |
1299 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
1300 | } | |
1301 | ||
1302 | static int pinctrl_devices_open(struct inode *inode, struct file *file) | |
1303 | { | |
1304 | return single_open(file, pinctrl_devices_show, NULL); | |
1305 | } | |
1306 | ||
3eedb437 SW |
1307 | static int pinctrl_maps_open(struct inode *inode, struct file *file) |
1308 | { | |
1309 | return single_open(file, pinctrl_maps_show, NULL); | |
1310 | } | |
1311 | ||
befe5bdf LW |
1312 | static int pinctrl_open(struct inode *inode, struct file *file) |
1313 | { | |
1314 | return single_open(file, pinctrl_show, NULL); | |
1315 | } | |
1316 | ||
2744e8af LW |
1317 | static const struct file_operations pinctrl_pins_ops = { |
1318 | .open = pinctrl_pins_open, | |
1319 | .read = seq_read, | |
1320 | .llseek = seq_lseek, | |
1321 | .release = single_release, | |
1322 | }; | |
1323 | ||
1324 | static const struct file_operations pinctrl_groups_ops = { | |
1325 | .open = pinctrl_groups_open, | |
1326 | .read = seq_read, | |
1327 | .llseek = seq_lseek, | |
1328 | .release = single_release, | |
1329 | }; | |
1330 | ||
1331 | static const struct file_operations pinctrl_gpioranges_ops = { | |
1332 | .open = pinctrl_gpioranges_open, | |
1333 | .read = seq_read, | |
1334 | .llseek = seq_lseek, | |
1335 | .release = single_release, | |
1336 | }; | |
1337 | ||
3eedb437 SW |
1338 | static const struct file_operations pinctrl_devices_ops = { |
1339 | .open = pinctrl_devices_open, | |
befe5bdf LW |
1340 | .read = seq_read, |
1341 | .llseek = seq_lseek, | |
1342 | .release = single_release, | |
1343 | }; | |
1344 | ||
3eedb437 SW |
1345 | static const struct file_operations pinctrl_maps_ops = { |
1346 | .open = pinctrl_maps_open, | |
2744e8af LW |
1347 | .read = seq_read, |
1348 | .llseek = seq_lseek, | |
1349 | .release = single_release, | |
1350 | }; | |
1351 | ||
befe5bdf LW |
1352 | static const struct file_operations pinctrl_ops = { |
1353 | .open = pinctrl_open, | |
1354 | .read = seq_read, | |
1355 | .llseek = seq_lseek, | |
1356 | .release = single_release, | |
1357 | }; | |
1358 | ||
2744e8af LW |
1359 | static struct dentry *debugfs_root; |
1360 | ||
1361 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1362 | { | |
02157160 | 1363 | struct dentry *device_root; |
2744e8af | 1364 | |
51cd24ee | 1365 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
2744e8af | 1366 | debugfs_root); |
02157160 TL |
1367 | pctldev->device_root = device_root; |
1368 | ||
2744e8af LW |
1369 | if (IS_ERR(device_root) || !device_root) { |
1370 | pr_warn("failed to create debugfs directory for %s\n", | |
51cd24ee | 1371 | dev_name(pctldev->dev)); |
2744e8af LW |
1372 | return; |
1373 | } | |
1374 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
1375 | device_root, pctldev, &pinctrl_pins_ops); | |
1376 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
1377 | device_root, pctldev, &pinctrl_groups_ops); | |
1378 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
1379 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
1380 | pinmux_init_device_debugfs(device_root, pctldev); | |
ae6b4d85 | 1381 | pinconf_init_device_debugfs(device_root, pctldev); |
2744e8af LW |
1382 | } |
1383 | ||
02157160 TL |
1384 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1385 | { | |
1386 | debugfs_remove_recursive(pctldev->device_root); | |
1387 | } | |
1388 | ||
2744e8af LW |
1389 | static void pinctrl_init_debugfs(void) |
1390 | { | |
1391 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
1392 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
1393 | pr_warn("failed to create debugfs directory\n"); | |
1394 | debugfs_root = NULL; | |
1395 | return; | |
1396 | } | |
1397 | ||
1398 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
1399 | debugfs_root, NULL, &pinctrl_devices_ops); | |
3eedb437 SW |
1400 | debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
1401 | debugfs_root, NULL, &pinctrl_maps_ops); | |
befe5bdf LW |
1402 | debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
1403 | debugfs_root, NULL, &pinctrl_ops); | |
2744e8af LW |
1404 | } |
1405 | ||
1406 | #else /* CONFIG_DEBUG_FS */ | |
1407 | ||
1408 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1409 | { | |
1410 | } | |
1411 | ||
1412 | static void pinctrl_init_debugfs(void) | |
1413 | { | |
1414 | } | |
1415 | ||
02157160 TL |
1416 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1417 | { | |
1418 | } | |
1419 | ||
2744e8af LW |
1420 | #endif |
1421 | ||
d26bc49f SW |
1422 | static int pinctrl_check_ops(struct pinctrl_dev *pctldev) |
1423 | { | |
1424 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
1425 | ||
1426 | if (!ops || | |
d1e90e9e | 1427 | !ops->get_groups_count || |
d26bc49f SW |
1428 | !ops->get_group_name || |
1429 | !ops->get_group_pins) | |
1430 | return -EINVAL; | |
1431 | ||
57291ce2 SW |
1432 | if (ops->dt_node_to_map && !ops->dt_free_map) |
1433 | return -EINVAL; | |
1434 | ||
d26bc49f SW |
1435 | return 0; |
1436 | } | |
1437 | ||
2744e8af LW |
1438 | /** |
1439 | * pinctrl_register() - register a pin controller device | |
1440 | * @pctldesc: descriptor for this pin controller | |
1441 | * @dev: parent device for this pin controller | |
1442 | * @driver_data: private pin controller data for this pin controller | |
1443 | */ | |
1444 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
1445 | struct device *dev, void *driver_data) | |
1446 | { | |
2744e8af LW |
1447 | struct pinctrl_dev *pctldev; |
1448 | int ret; | |
1449 | ||
da9aecb0 | 1450 | if (!pctldesc) |
2744e8af | 1451 | return NULL; |
da9aecb0 | 1452 | if (!pctldesc->name) |
2744e8af LW |
1453 | return NULL; |
1454 | ||
02f5b989 | 1455 | pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); |
95dcd4ae SW |
1456 | if (pctldev == NULL) { |
1457 | dev_err(dev, "failed to alloc struct pinctrl_dev\n"); | |
b9130b77 | 1458 | return NULL; |
95dcd4ae | 1459 | } |
b9130b77 TL |
1460 | |
1461 | /* Initialize pin control device struct */ | |
1462 | pctldev->owner = pctldesc->owner; | |
1463 | pctldev->desc = pctldesc; | |
1464 | pctldev->driver_data = driver_data; | |
1465 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
b9130b77 | 1466 | INIT_LIST_HEAD(&pctldev->gpio_ranges); |
b9130b77 TL |
1467 | pctldev->dev = dev; |
1468 | ||
d26bc49f | 1469 | /* check core ops for sanity */ |
da9aecb0 | 1470 | if (pinctrl_check_ops(pctldev)) { |
ad6e1107 | 1471 | dev_err(dev, "pinctrl ops lacks necessary functions\n"); |
d26bc49f SW |
1472 | goto out_err; |
1473 | } | |
1474 | ||
2744e8af LW |
1475 | /* If we're implementing pinmuxing, check the ops for sanity */ |
1476 | if (pctldesc->pmxops) { | |
da9aecb0 | 1477 | if (pinmux_check_ops(pctldev)) |
b9130b77 | 1478 | goto out_err; |
2744e8af LW |
1479 | } |
1480 | ||
ae6b4d85 LW |
1481 | /* If we're implementing pinconfig, check the ops for sanity */ |
1482 | if (pctldesc->confops) { | |
da9aecb0 | 1483 | if (pinconf_check_ops(pctldev)) |
b9130b77 | 1484 | goto out_err; |
ae6b4d85 LW |
1485 | } |
1486 | ||
2744e8af | 1487 | /* Register all the pins */ |
ad6e1107 | 1488 | dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins); |
2744e8af LW |
1489 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); |
1490 | if (ret) { | |
ad6e1107 | 1491 | dev_err(dev, "error during pin registration\n"); |
2744e8af LW |
1492 | pinctrl_free_pindescs(pctldev, pctldesc->pins, |
1493 | pctldesc->npins); | |
51cd24ee | 1494 | goto out_err; |
2744e8af LW |
1495 | } |
1496 | ||
57b676f9 SW |
1497 | mutex_lock(&pinctrl_mutex); |
1498 | ||
8b9c139f | 1499 | list_add_tail(&pctldev->node, &pinctrldev_list); |
57b676f9 | 1500 | |
6e5e959d SW |
1501 | pctldev->p = pinctrl_get_locked(pctldev->dev); |
1502 | if (!IS_ERR(pctldev->p)) { | |
1503 | struct pinctrl_state *s = | |
1504 | pinctrl_lookup_state_locked(pctldev->p, | |
1505 | PINCTRL_STATE_DEFAULT); | |
ad6e1107 JC |
1506 | if (IS_ERR(s)) { |
1507 | dev_dbg(dev, "failed to lookup the default state\n"); | |
1508 | } else { | |
da9aecb0 | 1509 | if (pinctrl_select_state_locked(pctldev->p, s)) |
ad6e1107 JC |
1510 | dev_err(dev, |
1511 | "failed to select default state\n"); | |
ad6e1107 | 1512 | } |
6e5e959d | 1513 | } |
57b676f9 SW |
1514 | |
1515 | mutex_unlock(&pinctrl_mutex); | |
1516 | ||
2304b473 SW |
1517 | pinctrl_init_device_debugfs(pctldev); |
1518 | ||
2744e8af LW |
1519 | return pctldev; |
1520 | ||
51cd24ee SW |
1521 | out_err: |
1522 | kfree(pctldev); | |
2744e8af LW |
1523 | return NULL; |
1524 | } | |
1525 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
1526 | ||
1527 | /** | |
1528 | * pinctrl_unregister() - unregister pinmux | |
1529 | * @pctldev: pin controller to unregister | |
1530 | * | |
1531 | * Called by pinmux drivers to unregister a pinmux. | |
1532 | */ | |
1533 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
1534 | { | |
5d589b09 | 1535 | struct pinctrl_gpio_range *range, *n; |
2744e8af LW |
1536 | if (pctldev == NULL) |
1537 | return; | |
1538 | ||
02157160 | 1539 | pinctrl_remove_device_debugfs(pctldev); |
57b676f9 SW |
1540 | |
1541 | mutex_lock(&pinctrl_mutex); | |
1542 | ||
6e5e959d SW |
1543 | if (!IS_ERR(pctldev->p)) |
1544 | pinctrl_put_locked(pctldev->p, true); | |
57b676f9 | 1545 | |
2744e8af | 1546 | /* TODO: check that no pinmuxes are still active? */ |
2744e8af | 1547 | list_del(&pctldev->node); |
2744e8af LW |
1548 | /* Destroy descriptor tree */ |
1549 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
1550 | pctldev->desc->npins); | |
5d589b09 DA |
1551 | /* remove gpio ranges map */ |
1552 | list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node) | |
1553 | list_del(&range->node); | |
1554 | ||
51cd24ee | 1555 | kfree(pctldev); |
57b676f9 SW |
1556 | |
1557 | mutex_unlock(&pinctrl_mutex); | |
2744e8af LW |
1558 | } |
1559 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
1560 | ||
1561 | static int __init pinctrl_init(void) | |
1562 | { | |
1563 | pr_info("initialized pinctrl subsystem\n"); | |
1564 | pinctrl_init_debugfs(); | |
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | /* init early since many drivers really need to initialized pinmux early */ | |
1569 | core_initcall(pinctrl_init); |