Commit | Line | Data |
---|---|---|
c82ee6d3 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
0c2498f1 SH |
2 | /* |
3 | * Generic pwmlib implementation | |
4 | * | |
5 | * Copyright (C) 2011 Sascha Hauer <s.hauer@pengutronix.de> | |
f051c466 | 6 | * Copyright (C) 2011-2012 Avionic Design GmbH |
0c2498f1 SH |
7 | */ |
8 | ||
4a6ef8e3 | 9 | #include <linux/acpi.h> |
0c2498f1 SH |
10 | #include <linux/module.h> |
11 | #include <linux/pwm.h> | |
f051c466 | 12 | #include <linux/radix-tree.h> |
0c2498f1 SH |
13 | #include <linux/list.h> |
14 | #include <linux/mutex.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/device.h> | |
62099abf TR |
18 | #include <linux/debugfs.h> |
19 | #include <linux/seq_file.h> | |
0c2498f1 | 20 | |
208be769 | 21 | #include <dt-bindings/pwm/pwm.h> |
0c2498f1 | 22 | |
208be769 | 23 | #define MAX_PWMS 1024 |
83af2402 | 24 | |
8138d2dd TR |
25 | static DEFINE_MUTEX(pwm_lookup_lock); |
26 | static LIST_HEAD(pwm_lookup_list); | |
0c2498f1 | 27 | static DEFINE_MUTEX(pwm_lock); |
f051c466 TR |
28 | static LIST_HEAD(pwm_chips); |
29 | static DECLARE_BITMAP(allocated_pwms, MAX_PWMS); | |
30 | static RADIX_TREE(pwm_tree, GFP_KERNEL); | |
0c2498f1 | 31 | |
f051c466 | 32 | static struct pwm_device *pwm_to_device(unsigned int pwm) |
0c2498f1 | 33 | { |
f051c466 TR |
34 | return radix_tree_lookup(&pwm_tree, pwm); |
35 | } | |
36 | ||
37 | static int alloc_pwms(int pwm, unsigned int count) | |
38 | { | |
39 | unsigned int from = 0; | |
40 | unsigned int start; | |
41 | ||
42 | if (pwm >= MAX_PWMS) | |
43 | return -EINVAL; | |
44 | ||
45 | if (pwm >= 0) | |
46 | from = pwm; | |
0c2498f1 | 47 | |
f051c466 TR |
48 | start = bitmap_find_next_zero_area(allocated_pwms, MAX_PWMS, from, |
49 | count, 0); | |
50 | ||
51 | if (pwm >= 0 && start != pwm) | |
52 | return -EEXIST; | |
53 | ||
54 | if (start + count > MAX_PWMS) | |
55 | return -ENOSPC; | |
56 | ||
57 | return start; | |
58 | } | |
59 | ||
60 | static void free_pwms(struct pwm_chip *chip) | |
61 | { | |
62 | unsigned int i; | |
63 | ||
64 | for (i = 0; i < chip->npwm; i++) { | |
65 | struct pwm_device *pwm = &chip->pwms[i]; | |
83a98864 | 66 | |
f051c466 | 67 | radix_tree_delete(&pwm_tree, pwm->pwm); |
0c2498f1 SH |
68 | } |
69 | ||
f051c466 TR |
70 | bitmap_clear(allocated_pwms, chip->base, chip->npwm); |
71 | ||
72 | kfree(chip->pwms); | |
73 | chip->pwms = NULL; | |
74 | } | |
75 | ||
8138d2dd TR |
76 | static struct pwm_chip *pwmchip_find_by_name(const char *name) |
77 | { | |
78 | struct pwm_chip *chip; | |
79 | ||
80 | if (!name) | |
81 | return NULL; | |
82 | ||
83 | mutex_lock(&pwm_lock); | |
84 | ||
85 | list_for_each_entry(chip, &pwm_chips, list) { | |
86 | const char *chip_name = dev_name(chip->dev); | |
87 | ||
88 | if (chip_name && strcmp(chip_name, name) == 0) { | |
89 | mutex_unlock(&pwm_lock); | |
90 | return chip; | |
91 | } | |
92 | } | |
93 | ||
94 | mutex_unlock(&pwm_lock); | |
95 | ||
96 | return NULL; | |
97 | } | |
98 | ||
f051c466 TR |
99 | static int pwm_device_request(struct pwm_device *pwm, const char *label) |
100 | { | |
101 | int err; | |
102 | ||
103 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) | |
104 | return -EBUSY; | |
105 | ||
106 | if (!try_module_get(pwm->chip->ops->owner)) | |
107 | return -ENODEV; | |
108 | ||
109 | if (pwm->chip->ops->request) { | |
110 | err = pwm->chip->ops->request(pwm->chip, pwm); | |
111 | if (err) { | |
112 | module_put(pwm->chip->ops->owner); | |
113 | return err; | |
114 | } | |
115 | } | |
116 | ||
117 | set_bit(PWMF_REQUESTED, &pwm->flags); | |
118 | pwm->label = label; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
83af2402 PA |
123 | struct pwm_device * |
124 | of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) | |
125 | { | |
126 | struct pwm_device *pwm; | |
127 | ||
42883cbc | 128 | /* check, whether the driver supports a third cell for flags */ |
83af2402 PA |
129 | if (pc->of_pwm_n_cells < 3) |
130 | return ERR_PTR(-EINVAL); | |
131 | ||
42883cbc LW |
132 | /* flags in the third cell are optional */ |
133 | if (args->args_count < 2) | |
134 | return ERR_PTR(-EINVAL); | |
135 | ||
83af2402 PA |
136 | if (args->args[0] >= pc->npwm) |
137 | return ERR_PTR(-EINVAL); | |
138 | ||
139 | pwm = pwm_request_from_chip(pc, args->args[0], NULL); | |
140 | if (IS_ERR(pwm)) | |
141 | return pwm; | |
142 | ||
e39c0df1 | 143 | pwm->args.period = args->args[1]; |
42883cbc | 144 | pwm->args.polarity = PWM_POLARITY_NORMAL; |
83af2402 | 145 | |
42883cbc | 146 | if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED) |
e39c0df1 | 147 | pwm->args.polarity = PWM_POLARITY_INVERSED; |
83af2402 PA |
148 | |
149 | return pwm; | |
150 | } | |
417328c3 | 151 | EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags); |
83af2402 | 152 | |
e50d3523 SK |
153 | static struct pwm_device * |
154 | of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) | |
7299ab70 TR |
155 | { |
156 | struct pwm_device *pwm; | |
157 | ||
42883cbc | 158 | /* sanity check driver support */ |
7299ab70 TR |
159 | if (pc->of_pwm_n_cells < 2) |
160 | return ERR_PTR(-EINVAL); | |
161 | ||
42883cbc LW |
162 | /* all cells are required */ |
163 | if (args->args_count != pc->of_pwm_n_cells) | |
164 | return ERR_PTR(-EINVAL); | |
165 | ||
7299ab70 TR |
166 | if (args->args[0] >= pc->npwm) |
167 | return ERR_PTR(-EINVAL); | |
168 | ||
169 | pwm = pwm_request_from_chip(pc, args->args[0], NULL); | |
170 | if (IS_ERR(pwm)) | |
171 | return pwm; | |
172 | ||
e39c0df1 | 173 | pwm->args.period = args->args[1]; |
7299ab70 TR |
174 | |
175 | return pwm; | |
176 | } | |
177 | ||
dfeb86ec | 178 | static void of_pwmchip_add(struct pwm_chip *chip) |
7299ab70 TR |
179 | { |
180 | if (!chip->dev || !chip->dev->of_node) | |
181 | return; | |
182 | ||
183 | if (!chip->of_xlate) { | |
184 | chip->of_xlate = of_pwm_simple_xlate; | |
185 | chip->of_pwm_n_cells = 2; | |
186 | } | |
187 | ||
188 | of_node_get(chip->dev->of_node); | |
189 | } | |
190 | ||
dfeb86ec | 191 | static void of_pwmchip_remove(struct pwm_chip *chip) |
7299ab70 | 192 | { |
8d6cc073 | 193 | if (chip->dev) |
7299ab70 TR |
194 | of_node_put(chip->dev->of_node); |
195 | } | |
196 | ||
f051c466 TR |
197 | /** |
198 | * pwm_set_chip_data() - set private chip data for a PWM | |
199 | * @pwm: PWM device | |
200 | * @data: pointer to chip-specific data | |
04883802 TR |
201 | * |
202 | * Returns: 0 on success or a negative error code on failure. | |
f051c466 TR |
203 | */ |
204 | int pwm_set_chip_data(struct pwm_device *pwm, void *data) | |
205 | { | |
206 | if (!pwm) | |
207 | return -EINVAL; | |
208 | ||
209 | pwm->chip_data = data; | |
210 | ||
211 | return 0; | |
212 | } | |
928c4477 | 213 | EXPORT_SYMBOL_GPL(pwm_set_chip_data); |
f051c466 TR |
214 | |
215 | /** | |
216 | * pwm_get_chip_data() - get private chip data for a PWM | |
217 | * @pwm: PWM device | |
04883802 TR |
218 | * |
219 | * Returns: A pointer to the chip-private data for the PWM device. | |
f051c466 TR |
220 | */ |
221 | void *pwm_get_chip_data(struct pwm_device *pwm) | |
222 | { | |
223 | return pwm ? pwm->chip_data : NULL; | |
0c2498f1 | 224 | } |
928c4477 | 225 | EXPORT_SYMBOL_GPL(pwm_get_chip_data); |
0c2498f1 | 226 | |
5ec803ed BB |
227 | static bool pwm_ops_check(const struct pwm_ops *ops) |
228 | { | |
229 | /* driver supports legacy, non-atomic operation */ | |
230 | if (ops->config && ops->enable && ops->disable) | |
231 | return true; | |
232 | ||
233 | /* driver supports atomic operation */ | |
234 | if (ops->apply) | |
235 | return true; | |
236 | ||
237 | return false; | |
238 | } | |
239 | ||
0c2498f1 | 240 | /** |
b6a00fae | 241 | * pwmchip_add_with_polarity() - register a new PWM chip |
0c2498f1 | 242 | * @chip: the PWM chip to add |
b6a00fae | 243 | * @polarity: initial polarity of PWM channels |
f051c466 TR |
244 | * |
245 | * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base | |
b6a00fae TK |
246 | * will be used. The initial polarity for all channels is specified by the |
247 | * @polarity parameter. | |
04883802 TR |
248 | * |
249 | * Returns: 0 on success or a negative error code on failure. | |
0c2498f1 | 250 | */ |
b6a00fae TK |
251 | int pwmchip_add_with_polarity(struct pwm_chip *chip, |
252 | enum pwm_polarity polarity) | |
0c2498f1 SH |
253 | { |
254 | struct pwm_device *pwm; | |
f051c466 TR |
255 | unsigned int i; |
256 | int ret; | |
0c2498f1 | 257 | |
5ec803ed BB |
258 | if (!chip || !chip->dev || !chip->ops || !chip->npwm) |
259 | return -EINVAL; | |
260 | ||
261 | if (!pwm_ops_check(chip->ops)) | |
f051c466 | 262 | return -EINVAL; |
0c2498f1 SH |
263 | |
264 | mutex_lock(&pwm_lock); | |
265 | ||
f051c466 TR |
266 | ret = alloc_pwms(chip->base, chip->npwm); |
267 | if (ret < 0) | |
268 | goto out; | |
269 | ||
2907f8ab | 270 | chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL); |
f051c466 TR |
271 | if (!chip->pwms) { |
272 | ret = -ENOMEM; | |
0c2498f1 SH |
273 | goto out; |
274 | } | |
275 | ||
f051c466 TR |
276 | chip->base = ret; |
277 | ||
278 | for (i = 0; i < chip->npwm; i++) { | |
279 | pwm = &chip->pwms[i]; | |
280 | ||
281 | pwm->chip = chip; | |
282 | pwm->pwm = chip->base + i; | |
283 | pwm->hwpwm = i; | |
43a276b0 | 284 | pwm->state.polarity = polarity; |
0c2498f1 | 285 | |
15fa8a43 BB |
286 | if (chip->ops->get_state) |
287 | chip->ops->get_state(chip, pwm, &pwm->state); | |
0c2498f1 | 288 | |
f051c466 TR |
289 | radix_tree_insert(&pwm_tree, pwm->pwm, pwm); |
290 | } | |
291 | ||
292 | bitmap_set(allocated_pwms, chip->base, chip->npwm); | |
293 | ||
294 | INIT_LIST_HEAD(&chip->list); | |
295 | list_add(&chip->list, &pwm_chips); | |
0c2498f1 | 296 | |
f051c466 TR |
297 | ret = 0; |
298 | ||
7299ab70 TR |
299 | if (IS_ENABLED(CONFIG_OF)) |
300 | of_pwmchip_add(chip); | |
301 | ||
f051c466 TR |
302 | out: |
303 | mutex_unlock(&pwm_lock); | |
347ab948 PH |
304 | |
305 | if (!ret) | |
306 | pwmchip_sysfs_export(chip); | |
307 | ||
0c2498f1 SH |
308 | return ret; |
309 | } | |
b6a00fae TK |
310 | EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity); |
311 | ||
312 | /** | |
313 | * pwmchip_add() - register a new PWM chip | |
314 | * @chip: the PWM chip to add | |
315 | * | |
316 | * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base | |
317 | * will be used. The initial polarity for all channels is normal. | |
04883802 TR |
318 | * |
319 | * Returns: 0 on success or a negative error code on failure. | |
b6a00fae TK |
320 | */ |
321 | int pwmchip_add(struct pwm_chip *chip) | |
322 | { | |
323 | return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL); | |
324 | } | |
0c2498f1 SH |
325 | EXPORT_SYMBOL_GPL(pwmchip_add); |
326 | ||
327 | /** | |
328 | * pwmchip_remove() - remove a PWM chip | |
329 | * @chip: the PWM chip to remove | |
330 | * | |
331 | * Removes a PWM chip. This function may return busy if the PWM chip provides | |
332 | * a PWM device that is still requested. | |
04883802 TR |
333 | * |
334 | * Returns: 0 on success or a negative error code on failure. | |
0c2498f1 SH |
335 | */ |
336 | int pwmchip_remove(struct pwm_chip *chip) | |
337 | { | |
f051c466 | 338 | unsigned int i; |
0c2498f1 SH |
339 | int ret = 0; |
340 | ||
347ab948 | 341 | pwmchip_sysfs_unexport(chip); |
0733424c | 342 | |
0c2498f1 SH |
343 | mutex_lock(&pwm_lock); |
344 | ||
f051c466 TR |
345 | for (i = 0; i < chip->npwm; i++) { |
346 | struct pwm_device *pwm = &chip->pwms[i]; | |
0c2498f1 | 347 | |
f051c466 TR |
348 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) { |
349 | ret = -EBUSY; | |
350 | goto out; | |
351 | } | |
0c2498f1 SH |
352 | } |
353 | ||
f051c466 | 354 | list_del_init(&chip->list); |
7299ab70 TR |
355 | |
356 | if (IS_ENABLED(CONFIG_OF)) | |
357 | of_pwmchip_remove(chip); | |
358 | ||
f051c466 | 359 | free_pwms(chip); |
0c2498f1 | 360 | |
0c2498f1 SH |
361 | out: |
362 | mutex_unlock(&pwm_lock); | |
0c2498f1 SH |
363 | return ret; |
364 | } | |
365 | EXPORT_SYMBOL_GPL(pwmchip_remove); | |
366 | ||
367 | /** | |
368 | * pwm_request() - request a PWM device | |
04883802 | 369 | * @pwm: global PWM device index |
0c2498f1 | 370 | * @label: PWM device label |
8138d2dd TR |
371 | * |
372 | * This function is deprecated, use pwm_get() instead. | |
04883802 TR |
373 | * |
374 | * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on | |
375 | * failure. | |
0c2498f1 | 376 | */ |
f051c466 | 377 | struct pwm_device *pwm_request(int pwm, const char *label) |
0c2498f1 | 378 | { |
f051c466 TR |
379 | struct pwm_device *dev; |
380 | int err; | |
381 | ||
382 | if (pwm < 0 || pwm >= MAX_PWMS) | |
383 | return ERR_PTR(-EINVAL); | |
0c2498f1 SH |
384 | |
385 | mutex_lock(&pwm_lock); | |
386 | ||
f051c466 TR |
387 | dev = pwm_to_device(pwm); |
388 | if (!dev) { | |
389 | dev = ERR_PTR(-EPROBE_DEFER); | |
0c2498f1 SH |
390 | goto out; |
391 | } | |
392 | ||
f051c466 TR |
393 | err = pwm_device_request(dev, label); |
394 | if (err < 0) | |
395 | dev = ERR_PTR(err); | |
0c2498f1 | 396 | |
f051c466 TR |
397 | out: |
398 | mutex_unlock(&pwm_lock); | |
0c2498f1 | 399 | |
f051c466 TR |
400 | return dev; |
401 | } | |
402 | EXPORT_SYMBOL_GPL(pwm_request); | |
0c2498f1 | 403 | |
f051c466 TR |
404 | /** |
405 | * pwm_request_from_chip() - request a PWM device relative to a PWM chip | |
406 | * @chip: PWM chip | |
407 | * @index: per-chip index of the PWM to request | |
408 | * @label: a literal description string of this PWM | |
409 | * | |
04883802 TR |
410 | * Returns: A pointer to the PWM device at the given index of the given PWM |
411 | * chip. A negative error code is returned if the index is not valid for the | |
412 | * specified PWM chip or if the PWM device cannot be requested. | |
f051c466 TR |
413 | */ |
414 | struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, | |
415 | unsigned int index, | |
416 | const char *label) | |
417 | { | |
418 | struct pwm_device *pwm; | |
419 | int err; | |
0c2498f1 | 420 | |
f051c466 TR |
421 | if (!chip || index >= chip->npwm) |
422 | return ERR_PTR(-EINVAL); | |
0c2498f1 | 423 | |
f051c466 TR |
424 | mutex_lock(&pwm_lock); |
425 | pwm = &chip->pwms[index]; | |
0c2498f1 | 426 | |
f051c466 TR |
427 | err = pwm_device_request(pwm, label); |
428 | if (err < 0) | |
429 | pwm = ERR_PTR(err); | |
430 | ||
431 | mutex_unlock(&pwm_lock); | |
0c2498f1 SH |
432 | return pwm; |
433 | } | |
f051c466 | 434 | EXPORT_SYMBOL_GPL(pwm_request_from_chip); |
0c2498f1 SH |
435 | |
436 | /** | |
437 | * pwm_free() - free a PWM device | |
438 | * @pwm: PWM device | |
8138d2dd TR |
439 | * |
440 | * This function is deprecated, use pwm_put() instead. | |
0c2498f1 SH |
441 | */ |
442 | void pwm_free(struct pwm_device *pwm) | |
443 | { | |
8138d2dd | 444 | pwm_put(pwm); |
0c2498f1 SH |
445 | } |
446 | EXPORT_SYMBOL_GPL(pwm_free); | |
447 | ||
448 | /** | |
5ec803ed | 449 | * pwm_apply_state() - atomically apply a new state to a PWM device |
0c2498f1 | 450 | * @pwm: PWM device |
71523d18 | 451 | * @state: new state to apply |
0c2498f1 | 452 | */ |
71523d18 | 453 | int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) |
0c2498f1 | 454 | { |
fc3c5512 | 455 | struct pwm_chip *chip; |
76abbdde HS |
456 | int err; |
457 | ||
ef2bf499 BN |
458 | if (!pwm || !state || !state->period || |
459 | state->duty_cycle > state->period) | |
f051c466 TR |
460 | return -EINVAL; |
461 | ||
fc3c5512 UKK |
462 | chip = pwm->chip; |
463 | ||
309b32fb UKK |
464 | if (state->period == pwm->state.period && |
465 | state->duty_cycle == pwm->state.duty_cycle && | |
466 | state->polarity == pwm->state.polarity && | |
467 | state->enabled == pwm->state.enabled) | |
5ec803ed | 468 | return 0; |
76abbdde | 469 | |
fc3c5512 UKK |
470 | if (chip->ops->apply) { |
471 | err = chip->ops->apply(chip, pwm, state); | |
5ec803ed BB |
472 | if (err) |
473 | return err; | |
0c2498f1 | 474 | |
01ccf903 UKK |
475 | /* |
476 | * .apply might have to round some values in *state, if possible | |
477 | * read the actually implemented value back. | |
478 | */ | |
479 | if (chip->ops->get_state) | |
480 | chip->ops->get_state(chip, pwm, &pwm->state); | |
481 | else | |
482 | pwm->state = *state; | |
5ec803ed BB |
483 | } else { |
484 | /* | |
485 | * FIXME: restore the initial state in case of error. | |
486 | */ | |
487 | if (state->polarity != pwm->state.polarity) { | |
fc3c5512 | 488 | if (!chip->ops->set_polarity) |
5ec803ed BB |
489 | return -ENOTSUPP; |
490 | ||
491 | /* | |
492 | * Changing the polarity of a running PWM is | |
493 | * only allowed when the PWM driver implements | |
494 | * ->apply(). | |
495 | */ | |
496 | if (pwm->state.enabled) { | |
fc3c5512 | 497 | chip->ops->disable(chip, pwm); |
5ec803ed BB |
498 | pwm->state.enabled = false; |
499 | } | |
500 | ||
fc3c5512 UKK |
501 | err = chip->ops->set_polarity(chip, pwm, |
502 | state->polarity); | |
5ec803ed BB |
503 | if (err) |
504 | return err; | |
505 | ||
506 | pwm->state.polarity = state->polarity; | |
507 | } | |
76abbdde | 508 | |
5ec803ed BB |
509 | if (state->period != pwm->state.period || |
510 | state->duty_cycle != pwm->state.duty_cycle) { | |
fc3c5512 UKK |
511 | err = chip->ops->config(pwm->chip, pwm, |
512 | state->duty_cycle, | |
513 | state->period); | |
5ec803ed BB |
514 | if (err) |
515 | return err; | |
0aa0869c | 516 | |
5ec803ed BB |
517 | pwm->state.duty_cycle = state->duty_cycle; |
518 | pwm->state.period = state->period; | |
519 | } | |
0aa0869c | 520 | |
5ec803ed BB |
521 | if (state->enabled != pwm->state.enabled) { |
522 | if (state->enabled) { | |
fc3c5512 | 523 | err = chip->ops->enable(chip, pwm); |
5ec803ed BB |
524 | if (err) |
525 | return err; | |
526 | } else { | |
fc3c5512 | 527 | chip->ops->disable(chip, pwm); |
5ec803ed | 528 | } |
d1cd2142 | 529 | |
5ec803ed BB |
530 | pwm->state.enabled = state->enabled; |
531 | } | |
d1cd2142 | 532 | } |
0aa0869c | 533 | |
459a25af | 534 | return 0; |
0aa0869c | 535 | } |
5ec803ed | 536 | EXPORT_SYMBOL_GPL(pwm_apply_state); |
0aa0869c | 537 | |
3a3d1a4e LJ |
538 | /** |
539 | * pwm_capture() - capture and report a PWM signal | |
540 | * @pwm: PWM device | |
541 | * @result: structure to fill with capture result | |
542 | * @timeout: time to wait, in milliseconds, before giving up on capture | |
543 | * | |
544 | * Returns: 0 on success or a negative error code on failure. | |
545 | */ | |
546 | int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, | |
547 | unsigned long timeout) | |
548 | { | |
549 | int err; | |
550 | ||
551 | if (!pwm || !pwm->chip->ops) | |
552 | return -EINVAL; | |
553 | ||
554 | if (!pwm->chip->ops->capture) | |
555 | return -ENOSYS; | |
556 | ||
557 | mutex_lock(&pwm_lock); | |
558 | err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout); | |
559 | mutex_unlock(&pwm_lock); | |
560 | ||
561 | return err; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(pwm_capture); | |
564 | ||
0c2498f1 | 565 | /** |
5ec803ed | 566 | * pwm_adjust_config() - adjust the current PWM config to the PWM arguments |
0c2498f1 | 567 | * @pwm: PWM device |
04883802 | 568 | * |
5ec803ed BB |
569 | * This function will adjust the PWM config to the PWM arguments provided |
570 | * by the DT or PWM lookup table. This is particularly useful to adapt | |
571 | * the bootloader config to the Linux one. | |
0c2498f1 | 572 | */ |
5ec803ed | 573 | int pwm_adjust_config(struct pwm_device *pwm) |
0c2498f1 | 574 | { |
5ec803ed BB |
575 | struct pwm_state state; |
576 | struct pwm_args pargs; | |
d1cd2142 | 577 | |
5ec803ed BB |
578 | pwm_get_args(pwm, &pargs); |
579 | pwm_get_state(pwm, &state); | |
d1cd2142 | 580 | |
5ec803ed BB |
581 | /* |
582 | * If the current period is zero it means that either the PWM driver | |
583 | * does not support initial state retrieval or the PWM has not yet | |
584 | * been configured. | |
585 | * | |
586 | * In either case, we setup the new period and polarity, and assign a | |
587 | * duty cycle of 0. | |
588 | */ | |
589 | if (!state.period) { | |
590 | state.duty_cycle = 0; | |
591 | state.period = pargs.period; | |
592 | state.polarity = pargs.polarity; | |
d1cd2142 | 593 | |
5ec803ed | 594 | return pwm_apply_state(pwm, &state); |
d1cd2142 JR |
595 | } |
596 | ||
5ec803ed BB |
597 | /* |
598 | * Adjust the PWM duty cycle/period based on the period value provided | |
599 | * in PWM args. | |
600 | */ | |
601 | if (pargs.period != state.period) { | |
602 | u64 dutycycle = (u64)state.duty_cycle * pargs.period; | |
0c2498f1 | 603 | |
5ec803ed BB |
604 | do_div(dutycycle, state.period); |
605 | state.duty_cycle = dutycycle; | |
606 | state.period = pargs.period; | |
607 | } | |
0c2498f1 | 608 | |
5ec803ed BB |
609 | /* |
610 | * If the polarity changed, we should also change the duty cycle. | |
611 | */ | |
612 | if (pargs.polarity != state.polarity) { | |
613 | state.polarity = pargs.polarity; | |
614 | state.duty_cycle = state.period - state.duty_cycle; | |
09a7e4a3 | 615 | } |
5ec803ed BB |
616 | |
617 | return pwm_apply_state(pwm, &state); | |
0c2498f1 | 618 | } |
5ec803ed | 619 | EXPORT_SYMBOL_GPL(pwm_adjust_config); |
62099abf | 620 | |
7299ab70 TR |
621 | static struct pwm_chip *of_node_to_pwmchip(struct device_node *np) |
622 | { | |
623 | struct pwm_chip *chip; | |
624 | ||
625 | mutex_lock(&pwm_lock); | |
626 | ||
627 | list_for_each_entry(chip, &pwm_chips, list) | |
628 | if (chip->dev && chip->dev->of_node == np) { | |
629 | mutex_unlock(&pwm_lock); | |
630 | return chip; | |
631 | } | |
632 | ||
633 | mutex_unlock(&pwm_lock); | |
634 | ||
635 | return ERR_PTR(-EPROBE_DEFER); | |
636 | } | |
637 | ||
b2c200e3 FG |
638 | static struct device_link *pwm_device_link_add(struct device *dev, |
639 | struct pwm_device *pwm) | |
640 | { | |
641 | struct device_link *dl; | |
642 | ||
643 | if (!dev) { | |
644 | /* | |
645 | * No device for the PWM consumer has been provided. It may | |
646 | * impact the PM sequence ordering: the PWM supplier may get | |
647 | * suspended before the consumer. | |
648 | */ | |
649 | dev_warn(pwm->chip->dev, | |
650 | "No consumer device specified to create a link to\n"); | |
651 | return NULL; | |
652 | } | |
653 | ||
654 | dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER); | |
655 | if (!dl) { | |
656 | dev_err(dev, "failed to create device link to %s\n", | |
657 | dev_name(pwm->chip->dev)); | |
658 | return ERR_PTR(-EINVAL); | |
659 | } | |
660 | ||
661 | return dl; | |
662 | } | |
663 | ||
7299ab70 | 664 | /** |
8eb96127 | 665 | * of_pwm_get() - request a PWM via the PWM framework |
b2c200e3 | 666 | * @dev: device for PWM consumer |
7299ab70 TR |
667 | * @np: device node to get the PWM from |
668 | * @con_id: consumer name | |
669 | * | |
670 | * Returns the PWM device parsed from the phandle and index specified in the | |
671 | * "pwms" property of a device tree node or a negative error-code on failure. | |
672 | * Values parsed from the device tree are stored in the returned PWM device | |
673 | * object. | |
674 | * | |
675 | * If con_id is NULL, the first PWM device listed in the "pwms" property will | |
676 | * be requested. Otherwise the "pwm-names" property is used to do a reverse | |
677 | * lookup of the PWM index. This also means that the "pwm-names" property | |
678 | * becomes mandatory for devices that look up the PWM device via the con_id | |
679 | * parameter. | |
04883802 TR |
680 | * |
681 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
682 | * error code on failure. | |
7299ab70 | 683 | */ |
b2c200e3 FG |
684 | struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np, |
685 | const char *con_id) | |
7299ab70 TR |
686 | { |
687 | struct pwm_device *pwm = NULL; | |
688 | struct of_phandle_args args; | |
b2c200e3 | 689 | struct device_link *dl; |
7299ab70 TR |
690 | struct pwm_chip *pc; |
691 | int index = 0; | |
692 | int err; | |
693 | ||
694 | if (con_id) { | |
695 | index = of_property_match_string(np, "pwm-names", con_id); | |
696 | if (index < 0) | |
697 | return ERR_PTR(index); | |
698 | } | |
699 | ||
700 | err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index, | |
701 | &args); | |
702 | if (err) { | |
f2dafc09 | 703 | pr_err("%s(): can't parse \"pwms\" property\n", __func__); |
7299ab70 TR |
704 | return ERR_PTR(err); |
705 | } | |
706 | ||
707 | pc = of_node_to_pwmchip(args.np); | |
708 | if (IS_ERR(pc)) { | |
93c292ef JB |
709 | if (PTR_ERR(pc) != -EPROBE_DEFER) |
710 | pr_err("%s(): PWM chip not found\n", __func__); | |
711 | ||
7299ab70 TR |
712 | pwm = ERR_CAST(pc); |
713 | goto put; | |
714 | } | |
715 | ||
7299ab70 TR |
716 | pwm = pc->of_xlate(pc, &args); |
717 | if (IS_ERR(pwm)) | |
718 | goto put; | |
719 | ||
b2c200e3 FG |
720 | dl = pwm_device_link_add(dev, pwm); |
721 | if (IS_ERR(dl)) { | |
722 | /* of_xlate ended up calling pwm_request_from_chip() */ | |
723 | pwm_free(pwm); | |
724 | pwm = ERR_CAST(dl); | |
725 | goto put; | |
726 | } | |
727 | ||
7299ab70 TR |
728 | /* |
729 | * If a consumer name was not given, try to look it up from the | |
730 | * "pwm-names" property if it exists. Otherwise use the name of | |
731 | * the user device node. | |
732 | */ | |
733 | if (!con_id) { | |
734 | err = of_property_read_string_index(np, "pwm-names", index, | |
735 | &con_id); | |
736 | if (err < 0) | |
737 | con_id = np->name; | |
738 | } | |
739 | ||
740 | pwm->label = con_id; | |
741 | ||
742 | put: | |
743 | of_node_put(args.np); | |
744 | ||
745 | return pwm; | |
746 | } | |
8eb96127 | 747 | EXPORT_SYMBOL_GPL(of_pwm_get); |
7299ab70 | 748 | |
4a6ef8e3 NV |
749 | #if IS_ENABLED(CONFIG_ACPI) |
750 | static struct pwm_chip *device_to_pwmchip(struct device *dev) | |
751 | { | |
752 | struct pwm_chip *chip; | |
753 | ||
754 | mutex_lock(&pwm_lock); | |
755 | ||
756 | list_for_each_entry(chip, &pwm_chips, list) { | |
757 | struct acpi_device *adev = ACPI_COMPANION(chip->dev); | |
758 | ||
759 | if ((chip->dev == dev) || (adev && &adev->dev == dev)) { | |
760 | mutex_unlock(&pwm_lock); | |
761 | return chip; | |
762 | } | |
763 | } | |
764 | ||
765 | mutex_unlock(&pwm_lock); | |
766 | ||
767 | return ERR_PTR(-EPROBE_DEFER); | |
768 | } | |
769 | #endif | |
770 | ||
771 | /** | |
772 | * acpi_pwm_get() - request a PWM via parsing "pwms" property in ACPI | |
773 | * @fwnode: firmware node to get the "pwm" property from | |
774 | * | |
775 | * Returns the PWM device parsed from the fwnode and index specified in the | |
776 | * "pwms" property or a negative error-code on failure. | |
777 | * Values parsed from the device tree are stored in the returned PWM device | |
778 | * object. | |
779 | * | |
780 | * This is analogous to of_pwm_get() except con_id is not yet supported. | |
781 | * ACPI entries must look like | |
782 | * Package () {"pwms", Package () | |
783 | * { <PWM device reference>, <PWM index>, <PWM period> [, <PWM flags>]}} | |
784 | * | |
785 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
786 | * error code on failure. | |
787 | */ | |
788 | static struct pwm_device *acpi_pwm_get(struct fwnode_handle *fwnode) | |
789 | { | |
790 | struct pwm_device *pwm = ERR_PTR(-ENODEV); | |
791 | #if IS_ENABLED(CONFIG_ACPI) | |
792 | struct fwnode_reference_args args; | |
793 | struct acpi_device *acpi; | |
794 | struct pwm_chip *chip; | |
795 | int ret; | |
796 | ||
797 | memset(&args, 0, sizeof(args)); | |
798 | ||
799 | ret = __acpi_node_get_property_reference(fwnode, "pwms", 0, 3, &args); | |
800 | if (ret < 0) | |
801 | return ERR_PTR(ret); | |
802 | ||
803 | acpi = to_acpi_device_node(args.fwnode); | |
804 | if (!acpi) | |
805 | return ERR_PTR(-EINVAL); | |
806 | ||
807 | if (args.nargs < 2) | |
808 | return ERR_PTR(-EPROTO); | |
809 | ||
810 | chip = device_to_pwmchip(&acpi->dev); | |
811 | if (IS_ERR(chip)) | |
812 | return ERR_CAST(chip); | |
813 | ||
814 | pwm = pwm_request_from_chip(chip, args.args[0], NULL); | |
815 | if (IS_ERR(pwm)) | |
816 | return pwm; | |
817 | ||
818 | pwm->args.period = args.args[1]; | |
819 | pwm->args.polarity = PWM_POLARITY_NORMAL; | |
820 | ||
821 | if (args.nargs > 2 && args.args[2] & PWM_POLARITY_INVERTED) | |
822 | pwm->args.polarity = PWM_POLARITY_INVERSED; | |
823 | #endif | |
824 | ||
825 | return pwm; | |
826 | } | |
827 | ||
8138d2dd TR |
828 | /** |
829 | * pwm_add_table() - register PWM device consumers | |
830 | * @table: array of consumers to register | |
831 | * @num: number of consumers in table | |
832 | */ | |
c264f111 | 833 | void pwm_add_table(struct pwm_lookup *table, size_t num) |
8138d2dd TR |
834 | { |
835 | mutex_lock(&pwm_lookup_lock); | |
836 | ||
837 | while (num--) { | |
838 | list_add_tail(&table->list, &pwm_lookup_list); | |
839 | table++; | |
840 | } | |
841 | ||
842 | mutex_unlock(&pwm_lookup_lock); | |
843 | } | |
844 | ||
efb0de55 SK |
845 | /** |
846 | * pwm_remove_table() - unregister PWM device consumers | |
847 | * @table: array of consumers to unregister | |
848 | * @num: number of consumers in table | |
849 | */ | |
850 | void pwm_remove_table(struct pwm_lookup *table, size_t num) | |
851 | { | |
852 | mutex_lock(&pwm_lookup_lock); | |
853 | ||
854 | while (num--) { | |
855 | list_del(&table->list); | |
856 | table++; | |
857 | } | |
858 | ||
859 | mutex_unlock(&pwm_lookup_lock); | |
860 | } | |
861 | ||
8138d2dd TR |
862 | /** |
863 | * pwm_get() - look up and request a PWM device | |
864 | * @dev: device for PWM consumer | |
865 | * @con_id: consumer name | |
866 | * | |
7299ab70 TR |
867 | * Lookup is first attempted using DT. If the device was not instantiated from |
868 | * a device tree, a PWM chip and a relative index is looked up via a table | |
869 | * supplied by board setup code (see pwm_add_table()). | |
8138d2dd TR |
870 | * |
871 | * Once a PWM chip has been found the specified PWM device will be requested | |
872 | * and is ready to be used. | |
04883802 TR |
873 | * |
874 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
875 | * error code on failure. | |
8138d2dd TR |
876 | */ |
877 | struct pwm_device *pwm_get(struct device *dev, const char *con_id) | |
878 | { | |
e50d3523 | 879 | const char *dev_id = dev ? dev_name(dev) : NULL; |
69efb343 HG |
880 | struct pwm_device *pwm; |
881 | struct pwm_chip *chip; | |
b2c200e3 | 882 | struct device_link *dl; |
8138d2dd | 883 | unsigned int best = 0; |
70145f87 | 884 | struct pwm_lookup *p, *chosen = NULL; |
8138d2dd | 885 | unsigned int match; |
b526a314 | 886 | int err; |
8138d2dd | 887 | |
7299ab70 TR |
888 | /* look up via DT first */ |
889 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
b2c200e3 | 890 | return of_pwm_get(dev, dev->of_node, con_id); |
7299ab70 | 891 | |
4a6ef8e3 | 892 | /* then lookup via ACPI */ |
6cf9481b HG |
893 | if (dev && is_acpi_node(dev->fwnode)) { |
894 | pwm = acpi_pwm_get(dev->fwnode); | |
895 | if (!IS_ERR(pwm) || PTR_ERR(pwm) != -ENOENT) | |
896 | return pwm; | |
897 | } | |
7299ab70 | 898 | |
8138d2dd TR |
899 | /* |
900 | * We look up the provider in the static table typically provided by | |
901 | * board setup code. We first try to lookup the consumer device by | |
902 | * name. If the consumer device was passed in as NULL or if no match | |
903 | * was found, we try to find the consumer by directly looking it up | |
904 | * by name. | |
905 | * | |
906 | * If a match is found, the provider PWM chip is looked up by name | |
907 | * and a PWM device is requested using the PWM device per-chip index. | |
908 | * | |
909 | * The lookup algorithm was shamelessly taken from the clock | |
910 | * framework: | |
911 | * | |
912 | * We do slightly fuzzy matching here: | |
913 | * An entry with a NULL ID is assumed to be a wildcard. | |
914 | * If an entry has a device ID, it must match | |
915 | * If an entry has a connection ID, it must match | |
916 | * Then we take the most specific entry - with the following order | |
917 | * of precedence: dev+con > dev only > con only. | |
918 | */ | |
919 | mutex_lock(&pwm_lookup_lock); | |
920 | ||
921 | list_for_each_entry(p, &pwm_lookup_list, list) { | |
922 | match = 0; | |
923 | ||
924 | if (p->dev_id) { | |
925 | if (!dev_id || strcmp(p->dev_id, dev_id)) | |
926 | continue; | |
927 | ||
928 | match += 2; | |
929 | } | |
930 | ||
931 | if (p->con_id) { | |
932 | if (!con_id || strcmp(p->con_id, con_id)) | |
933 | continue; | |
934 | ||
935 | match += 1; | |
936 | } | |
937 | ||
938 | if (match > best) { | |
70145f87 | 939 | chosen = p; |
8138d2dd TR |
940 | |
941 | if (match != 3) | |
942 | best = match; | |
943 | else | |
944 | break; | |
945 | } | |
946 | } | |
947 | ||
69efb343 HG |
948 | mutex_unlock(&pwm_lookup_lock); |
949 | ||
950 | if (!chosen) | |
951 | return ERR_PTR(-ENODEV); | |
3796ce1d | 952 | |
70145f87 | 953 | chip = pwmchip_find_by_name(chosen->provider); |
b526a314 HG |
954 | |
955 | /* | |
956 | * If the lookup entry specifies a module, load the module and retry | |
957 | * the PWM chip lookup. This can be used to work around driver load | |
958 | * ordering issues if driver's can't be made to properly support the | |
959 | * deferred probe mechanism. | |
960 | */ | |
961 | if (!chip && chosen->module) { | |
962 | err = request_module(chosen->module); | |
963 | if (err == 0) | |
964 | chip = pwmchip_find_by_name(chosen->provider); | |
965 | } | |
966 | ||
70145f87 | 967 | if (!chip) |
69efb343 | 968 | return ERR_PTR(-EPROBE_DEFER); |
3796ce1d | 969 | |
70145f87 GU |
970 | pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id); |
971 | if (IS_ERR(pwm)) | |
69efb343 | 972 | return pwm; |
8138d2dd | 973 | |
b2c200e3 FG |
974 | dl = pwm_device_link_add(dev, pwm); |
975 | if (IS_ERR(dl)) { | |
976 | pwm_free(pwm); | |
977 | return ERR_CAST(dl); | |
978 | } | |
979 | ||
fbd45a12 BB |
980 | pwm->args.period = chosen->period; |
981 | pwm->args.polarity = chosen->polarity; | |
982 | ||
8138d2dd TR |
983 | return pwm; |
984 | } | |
985 | EXPORT_SYMBOL_GPL(pwm_get); | |
986 | ||
987 | /** | |
988 | * pwm_put() - release a PWM device | |
989 | * @pwm: PWM device | |
990 | */ | |
991 | void pwm_put(struct pwm_device *pwm) | |
992 | { | |
993 | if (!pwm) | |
994 | return; | |
995 | ||
996 | mutex_lock(&pwm_lock); | |
997 | ||
998 | if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) { | |
e50d3523 | 999 | pr_warn("PWM device already freed\n"); |
8138d2dd TR |
1000 | goto out; |
1001 | } | |
1002 | ||
1003 | if (pwm->chip->ops->free) | |
1004 | pwm->chip->ops->free(pwm->chip, pwm); | |
1005 | ||
e926b12c | 1006 | pwm_set_chip_data(pwm, NULL); |
8138d2dd TR |
1007 | pwm->label = NULL; |
1008 | ||
1009 | module_put(pwm->chip->ops->owner); | |
1010 | out: | |
1011 | mutex_unlock(&pwm_lock); | |
1012 | } | |
1013 | EXPORT_SYMBOL_GPL(pwm_put); | |
1014 | ||
6354316d AC |
1015 | static void devm_pwm_release(struct device *dev, void *res) |
1016 | { | |
1017 | pwm_put(*(struct pwm_device **)res); | |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * devm_pwm_get() - resource managed pwm_get() | |
1022 | * @dev: device for PWM consumer | |
1023 | * @con_id: consumer name | |
1024 | * | |
1025 | * This function performs like pwm_get() but the acquired PWM device will | |
1026 | * automatically be released on driver detach. | |
04883802 TR |
1027 | * |
1028 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1029 | * error code on failure. | |
6354316d AC |
1030 | */ |
1031 | struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id) | |
1032 | { | |
1033 | struct pwm_device **ptr, *pwm; | |
1034 | ||
77f0b9d2 | 1035 | ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL); |
6354316d AC |
1036 | if (!ptr) |
1037 | return ERR_PTR(-ENOMEM); | |
1038 | ||
1039 | pwm = pwm_get(dev, con_id); | |
1040 | if (!IS_ERR(pwm)) { | |
1041 | *ptr = pwm; | |
1042 | devres_add(dev, ptr); | |
1043 | } else { | |
1044 | devres_free(ptr); | |
1045 | } | |
1046 | ||
1047 | return pwm; | |
1048 | } | |
1049 | EXPORT_SYMBOL_GPL(devm_pwm_get); | |
1050 | ||
261a5edd PU |
1051 | /** |
1052 | * devm_of_pwm_get() - resource managed of_pwm_get() | |
1053 | * @dev: device for PWM consumer | |
1054 | * @np: device node to get the PWM from | |
1055 | * @con_id: consumer name | |
1056 | * | |
1057 | * This function performs like of_pwm_get() but the acquired PWM device will | |
1058 | * automatically be released on driver detach. | |
04883802 TR |
1059 | * |
1060 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1061 | * error code on failure. | |
261a5edd PU |
1062 | */ |
1063 | struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np, | |
1064 | const char *con_id) | |
1065 | { | |
1066 | struct pwm_device **ptr, *pwm; | |
1067 | ||
77f0b9d2 | 1068 | ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL); |
261a5edd PU |
1069 | if (!ptr) |
1070 | return ERR_PTR(-ENOMEM); | |
1071 | ||
b2c200e3 | 1072 | pwm = of_pwm_get(dev, np, con_id); |
261a5edd PU |
1073 | if (!IS_ERR(pwm)) { |
1074 | *ptr = pwm; | |
1075 | devres_add(dev, ptr); | |
1076 | } else { | |
1077 | devres_free(ptr); | |
1078 | } | |
1079 | ||
1080 | return pwm; | |
1081 | } | |
1082 | EXPORT_SYMBOL_GPL(devm_of_pwm_get); | |
1083 | ||
4a6ef8e3 NV |
1084 | /** |
1085 | * devm_fwnode_pwm_get() - request a resource managed PWM from firmware node | |
1086 | * @dev: device for PWM consumer | |
1087 | * @fwnode: firmware node to get the PWM from | |
1088 | * @con_id: consumer name | |
1089 | * | |
1090 | * Returns the PWM device parsed from the firmware node. See of_pwm_get() and | |
1091 | * acpi_pwm_get() for a detailed description. | |
1092 | * | |
1093 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1094 | * error code on failure. | |
1095 | */ | |
1096 | struct pwm_device *devm_fwnode_pwm_get(struct device *dev, | |
1097 | struct fwnode_handle *fwnode, | |
1098 | const char *con_id) | |
1099 | { | |
1100 | struct pwm_device **ptr, *pwm = ERR_PTR(-ENODEV); | |
1101 | ||
1102 | ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL); | |
1103 | if (!ptr) | |
1104 | return ERR_PTR(-ENOMEM); | |
1105 | ||
1106 | if (is_of_node(fwnode)) | |
1107 | pwm = of_pwm_get(dev, to_of_node(fwnode), con_id); | |
1108 | else if (is_acpi_node(fwnode)) | |
1109 | pwm = acpi_pwm_get(fwnode); | |
1110 | ||
1111 | if (!IS_ERR(pwm)) { | |
1112 | *ptr = pwm; | |
1113 | devres_add(dev, ptr); | |
1114 | } else { | |
1115 | devres_free(ptr); | |
1116 | } | |
1117 | ||
1118 | return pwm; | |
1119 | } | |
1120 | EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get); | |
1121 | ||
6354316d AC |
1122 | static int devm_pwm_match(struct device *dev, void *res, void *data) |
1123 | { | |
1124 | struct pwm_device **p = res; | |
1125 | ||
1126 | if (WARN_ON(!p || !*p)) | |
1127 | return 0; | |
1128 | ||
1129 | return *p == data; | |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * devm_pwm_put() - resource managed pwm_put() | |
1134 | * @dev: device for PWM consumer | |
1135 | * @pwm: PWM device | |
1136 | * | |
1137 | * Release a PWM previously allocated using devm_pwm_get(). Calling this | |
1138 | * function is usually not needed because devm-allocated resources are | |
1139 | * automatically released on driver detach. | |
1140 | */ | |
1141 | void devm_pwm_put(struct device *dev, struct pwm_device *pwm) | |
1142 | { | |
1143 | WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm)); | |
1144 | } | |
1145 | EXPORT_SYMBOL_GPL(devm_pwm_put); | |
1146 | ||
62099abf TR |
1147 | #ifdef CONFIG_DEBUG_FS |
1148 | static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s) | |
1149 | { | |
1150 | unsigned int i; | |
1151 | ||
1152 | for (i = 0; i < chip->npwm; i++) { | |
1153 | struct pwm_device *pwm = &chip->pwms[i]; | |
39100cee BB |
1154 | struct pwm_state state; |
1155 | ||
1156 | pwm_get_state(pwm, &state); | |
62099abf TR |
1157 | |
1158 | seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label); | |
1159 | ||
1160 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) | |
adcba1e3 | 1161 | seq_puts(s, " requested"); |
62099abf | 1162 | |
39100cee | 1163 | if (state.enabled) |
adcba1e3 | 1164 | seq_puts(s, " enabled"); |
62099abf | 1165 | |
23e3523f HS |
1166 | seq_printf(s, " period: %u ns", state.period); |
1167 | seq_printf(s, " duty: %u ns", state.duty_cycle); | |
1168 | seq_printf(s, " polarity: %s", | |
1169 | state.polarity ? "inverse" : "normal"); | |
1170 | ||
adcba1e3 | 1171 | seq_puts(s, "\n"); |
62099abf TR |
1172 | } |
1173 | } | |
1174 | ||
1175 | static void *pwm_seq_start(struct seq_file *s, loff_t *pos) | |
1176 | { | |
1177 | mutex_lock(&pwm_lock); | |
1178 | s->private = ""; | |
1179 | ||
1180 | return seq_list_start(&pwm_chips, *pos); | |
1181 | } | |
1182 | ||
1183 | static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1184 | { | |
1185 | s->private = "\n"; | |
1186 | ||
1187 | return seq_list_next(v, &pwm_chips, pos); | |
1188 | } | |
1189 | ||
1190 | static void pwm_seq_stop(struct seq_file *s, void *v) | |
1191 | { | |
1192 | mutex_unlock(&pwm_lock); | |
1193 | } | |
1194 | ||
1195 | static int pwm_seq_show(struct seq_file *s, void *v) | |
1196 | { | |
1197 | struct pwm_chip *chip = list_entry(v, struct pwm_chip, list); | |
1198 | ||
1199 | seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private, | |
1200 | chip->dev->bus ? chip->dev->bus->name : "no-bus", | |
1201 | dev_name(chip->dev), chip->npwm, | |
1202 | (chip->npwm != 1) ? "s" : ""); | |
1203 | ||
cc2d2247 | 1204 | pwm_dbg_show(chip, s); |
62099abf TR |
1205 | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | static const struct seq_operations pwm_seq_ops = { | |
1210 | .start = pwm_seq_start, | |
1211 | .next = pwm_seq_next, | |
1212 | .stop = pwm_seq_stop, | |
1213 | .show = pwm_seq_show, | |
1214 | }; | |
1215 | ||
1216 | static int pwm_seq_open(struct inode *inode, struct file *file) | |
1217 | { | |
1218 | return seq_open(file, &pwm_seq_ops); | |
1219 | } | |
1220 | ||
1221 | static const struct file_operations pwm_debugfs_ops = { | |
1222 | .owner = THIS_MODULE, | |
1223 | .open = pwm_seq_open, | |
1224 | .read = seq_read, | |
1225 | .llseek = seq_lseek, | |
1226 | .release = seq_release, | |
1227 | }; | |
1228 | ||
1229 | static int __init pwm_debugfs_init(void) | |
1230 | { | |
1231 | debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL, | |
1232 | &pwm_debugfs_ops); | |
1233 | ||
1234 | return 0; | |
1235 | } | |
62099abf TR |
1236 | subsys_initcall(pwm_debugfs_init); |
1237 | #endif /* CONFIG_DEBUG_FS */ |