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 | |
1188829a UKK |
23 | #define CREATE_TRACE_POINTS |
24 | #include <trace/events/pwm.h> | |
25 | ||
208be769 | 26 | #define MAX_PWMS 1024 |
83af2402 | 27 | |
8138d2dd TR |
28 | static DEFINE_MUTEX(pwm_lookup_lock); |
29 | static LIST_HEAD(pwm_lookup_list); | |
0c2498f1 | 30 | static DEFINE_MUTEX(pwm_lock); |
f051c466 TR |
31 | static LIST_HEAD(pwm_chips); |
32 | static DECLARE_BITMAP(allocated_pwms, MAX_PWMS); | |
33 | static RADIX_TREE(pwm_tree, GFP_KERNEL); | |
0c2498f1 | 34 | |
f051c466 | 35 | static struct pwm_device *pwm_to_device(unsigned int pwm) |
0c2498f1 | 36 | { |
f051c466 TR |
37 | return radix_tree_lookup(&pwm_tree, pwm); |
38 | } | |
39 | ||
f9a8ee8c | 40 | static int alloc_pwms(unsigned int count) |
f051c466 | 41 | { |
f051c466 TR |
42 | unsigned int start; |
43 | ||
f9a8ee8c | 44 | start = bitmap_find_next_zero_area(allocated_pwms, MAX_PWMS, 0, |
f051c466 TR |
45 | count, 0); |
46 | ||
f051c466 TR |
47 | if (start + count > MAX_PWMS) |
48 | return -ENOSPC; | |
49 | ||
50 | return start; | |
51 | } | |
52 | ||
53 | static void free_pwms(struct pwm_chip *chip) | |
54 | { | |
55 | unsigned int i; | |
56 | ||
57 | for (i = 0; i < chip->npwm; i++) { | |
58 | struct pwm_device *pwm = &chip->pwms[i]; | |
83a98864 | 59 | |
f051c466 | 60 | radix_tree_delete(&pwm_tree, pwm->pwm); |
0c2498f1 SH |
61 | } |
62 | ||
f051c466 TR |
63 | bitmap_clear(allocated_pwms, chip->base, chip->npwm); |
64 | ||
65 | kfree(chip->pwms); | |
66 | chip->pwms = NULL; | |
67 | } | |
68 | ||
8138d2dd TR |
69 | static struct pwm_chip *pwmchip_find_by_name(const char *name) |
70 | { | |
71 | struct pwm_chip *chip; | |
72 | ||
73 | if (!name) | |
74 | return NULL; | |
75 | ||
76 | mutex_lock(&pwm_lock); | |
77 | ||
78 | list_for_each_entry(chip, &pwm_chips, list) { | |
79 | const char *chip_name = dev_name(chip->dev); | |
80 | ||
81 | if (chip_name && strcmp(chip_name, name) == 0) { | |
82 | mutex_unlock(&pwm_lock); | |
83 | return chip; | |
84 | } | |
85 | } | |
86 | ||
87 | mutex_unlock(&pwm_lock); | |
88 | ||
89 | return NULL; | |
90 | } | |
91 | ||
f051c466 TR |
92 | static int pwm_device_request(struct pwm_device *pwm, const char *label) |
93 | { | |
94 | int err; | |
95 | ||
96 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) | |
97 | return -EBUSY; | |
98 | ||
99 | if (!try_module_get(pwm->chip->ops->owner)) | |
100 | return -ENODEV; | |
101 | ||
102 | if (pwm->chip->ops->request) { | |
103 | err = pwm->chip->ops->request(pwm->chip, pwm); | |
104 | if (err) { | |
105 | module_put(pwm->chip->ops->owner); | |
106 | return err; | |
107 | } | |
108 | } | |
109 | ||
1188829a | 110 | if (pwm->chip->ops->get_state) { |
cfc4c189 | 111 | pwm->chip->ops->get_state(pwm->chip, pwm, &pwm->state); |
1188829a | 112 | trace_pwm_get(pwm, &pwm->state); |
3ad1f3a3 | 113 | |
f5641d05 | 114 | if (IS_ENABLED(CONFIG_PWM_DEBUG)) |
3ad1f3a3 | 115 | pwm->last = pwm->state; |
1188829a | 116 | } |
cfc4c189 | 117 | |
f051c466 TR |
118 | set_bit(PWMF_REQUESTED, &pwm->flags); |
119 | pwm->label = label; | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
83af2402 PA |
124 | struct pwm_device * |
125 | of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) | |
126 | { | |
127 | struct pwm_device *pwm; | |
128 | ||
cf38c978 | 129 | if (pc->of_pwm_n_cells < 2) |
83af2402 PA |
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 | |
cf38c978 UKK |
146 | if (pc->of_pwm_n_cells >= 3) { |
147 | if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED) | |
148 | pwm->args.polarity = PWM_POLARITY_INVERSED; | |
149 | } | |
83af2402 PA |
150 | |
151 | return pwm; | |
152 | } | |
417328c3 | 153 | EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags); |
83af2402 | 154 | |
dfeb86ec | 155 | static void of_pwmchip_add(struct pwm_chip *chip) |
7299ab70 TR |
156 | { |
157 | if (!chip->dev || !chip->dev->of_node) | |
158 | return; | |
159 | ||
160 | if (!chip->of_xlate) { | |
69230cfa UKK |
161 | u32 pwm_cells; |
162 | ||
163 | if (of_property_read_u32(chip->dev->of_node, "#pwm-cells", | |
164 | &pwm_cells)) | |
165 | pwm_cells = 2; | |
166 | ||
5447e783 | 167 | chip->of_xlate = of_pwm_xlate_with_flags; |
69230cfa | 168 | chip->of_pwm_n_cells = pwm_cells; |
7299ab70 TR |
169 | } |
170 | ||
171 | of_node_get(chip->dev->of_node); | |
172 | } | |
173 | ||
dfeb86ec | 174 | static void of_pwmchip_remove(struct pwm_chip *chip) |
7299ab70 | 175 | { |
8d6cc073 | 176 | if (chip->dev) |
7299ab70 TR |
177 | of_node_put(chip->dev->of_node); |
178 | } | |
179 | ||
f051c466 TR |
180 | /** |
181 | * pwm_set_chip_data() - set private chip data for a PWM | |
182 | * @pwm: PWM device | |
183 | * @data: pointer to chip-specific data | |
04883802 TR |
184 | * |
185 | * Returns: 0 on success or a negative error code on failure. | |
f051c466 TR |
186 | */ |
187 | int pwm_set_chip_data(struct pwm_device *pwm, void *data) | |
188 | { | |
189 | if (!pwm) | |
190 | return -EINVAL; | |
191 | ||
192 | pwm->chip_data = data; | |
193 | ||
194 | return 0; | |
195 | } | |
928c4477 | 196 | EXPORT_SYMBOL_GPL(pwm_set_chip_data); |
f051c466 TR |
197 | |
198 | /** | |
199 | * pwm_get_chip_data() - get private chip data for a PWM | |
200 | * @pwm: PWM device | |
04883802 TR |
201 | * |
202 | * Returns: A pointer to the chip-private data for the PWM device. | |
f051c466 TR |
203 | */ |
204 | void *pwm_get_chip_data(struct pwm_device *pwm) | |
205 | { | |
206 | return pwm ? pwm->chip_data : NULL; | |
0c2498f1 | 207 | } |
928c4477 | 208 | EXPORT_SYMBOL_GPL(pwm_get_chip_data); |
0c2498f1 | 209 | |
3ad1f3a3 | 210 | static bool pwm_ops_check(const struct pwm_chip *chip) |
5ec803ed | 211 | { |
3ad1f3a3 UKK |
212 | |
213 | const struct pwm_ops *ops = chip->ops; | |
214 | ||
5ec803ed | 215 | /* driver supports legacy, non-atomic operation */ |
3ad1f3a3 UKK |
216 | if (ops->config && ops->enable && ops->disable) { |
217 | if (IS_ENABLED(CONFIG_PWM_DEBUG)) | |
218 | dev_warn(chip->dev, | |
219 | "Driver needs updating to atomic API\n"); | |
5ec803ed | 220 | |
5ec803ed | 221 | return true; |
3ad1f3a3 UKK |
222 | } |
223 | ||
224 | if (!ops->apply) | |
225 | return false; | |
226 | ||
227 | if (IS_ENABLED(CONFIG_PWM_DEBUG) && !ops->get_state) | |
228 | dev_warn(chip->dev, | |
229 | "Please implement the .get_state() callback\n"); | |
5ec803ed | 230 | |
3ad1f3a3 | 231 | return true; |
5ec803ed BB |
232 | } |
233 | ||
0c2498f1 | 234 | /** |
9666cec3 | 235 | * pwmchip_add() - register a new PWM chip |
0c2498f1 | 236 | * @chip: the PWM chip to add |
f051c466 | 237 | * |
9666cec3 | 238 | * Register a new PWM chip. |
04883802 TR |
239 | * |
240 | * Returns: 0 on success or a negative error code on failure. | |
0c2498f1 | 241 | */ |
9666cec3 | 242 | int pwmchip_add(struct pwm_chip *chip) |
0c2498f1 SH |
243 | { |
244 | struct pwm_device *pwm; | |
f051c466 TR |
245 | unsigned int i; |
246 | int ret; | |
0c2498f1 | 247 | |
5ec803ed BB |
248 | if (!chip || !chip->dev || !chip->ops || !chip->npwm) |
249 | return -EINVAL; | |
250 | ||
3ad1f3a3 | 251 | if (!pwm_ops_check(chip)) |
f051c466 | 252 | return -EINVAL; |
0c2498f1 SH |
253 | |
254 | mutex_lock(&pwm_lock); | |
255 | ||
f9a8ee8c | 256 | ret = alloc_pwms(chip->npwm); |
f051c466 TR |
257 | if (ret < 0) |
258 | goto out; | |
259 | ||
f9a8ee8c UKK |
260 | chip->base = ret; |
261 | ||
2907f8ab | 262 | chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL); |
f051c466 TR |
263 | if (!chip->pwms) { |
264 | ret = -ENOMEM; | |
0c2498f1 SH |
265 | goto out; |
266 | } | |
267 | ||
f051c466 TR |
268 | for (i = 0; i < chip->npwm; i++) { |
269 | pwm = &chip->pwms[i]; | |
270 | ||
271 | pwm->chip = chip; | |
272 | pwm->pwm = chip->base + i; | |
273 | pwm->hwpwm = i; | |
0c2498f1 | 274 | |
f051c466 TR |
275 | radix_tree_insert(&pwm_tree, pwm->pwm, pwm); |
276 | } | |
277 | ||
278 | bitmap_set(allocated_pwms, chip->base, chip->npwm); | |
279 | ||
280 | INIT_LIST_HEAD(&chip->list); | |
281 | list_add(&chip->list, &pwm_chips); | |
0c2498f1 | 282 | |
f051c466 TR |
283 | ret = 0; |
284 | ||
7299ab70 TR |
285 | if (IS_ENABLED(CONFIG_OF)) |
286 | of_pwmchip_add(chip); | |
287 | ||
f051c466 TR |
288 | out: |
289 | mutex_unlock(&pwm_lock); | |
347ab948 PH |
290 | |
291 | if (!ret) | |
292 | pwmchip_sysfs_export(chip); | |
293 | ||
0c2498f1 SH |
294 | return ret; |
295 | } | |
296 | EXPORT_SYMBOL_GPL(pwmchip_add); | |
297 | ||
298 | /** | |
299 | * pwmchip_remove() - remove a PWM chip | |
300 | * @chip: the PWM chip to remove | |
301 | * | |
302 | * Removes a PWM chip. This function may return busy if the PWM chip provides | |
303 | * a PWM device that is still requested. | |
04883802 TR |
304 | * |
305 | * Returns: 0 on success or a negative error code on failure. | |
0c2498f1 SH |
306 | */ |
307 | int pwmchip_remove(struct pwm_chip *chip) | |
308 | { | |
f051c466 | 309 | unsigned int i; |
0c2498f1 SH |
310 | int ret = 0; |
311 | ||
347ab948 | 312 | pwmchip_sysfs_unexport(chip); |
0733424c | 313 | |
0c2498f1 SH |
314 | mutex_lock(&pwm_lock); |
315 | ||
f051c466 TR |
316 | for (i = 0; i < chip->npwm; i++) { |
317 | struct pwm_device *pwm = &chip->pwms[i]; | |
0c2498f1 | 318 | |
f051c466 TR |
319 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) { |
320 | ret = -EBUSY; | |
321 | goto out; | |
322 | } | |
0c2498f1 SH |
323 | } |
324 | ||
f051c466 | 325 | list_del_init(&chip->list); |
7299ab70 TR |
326 | |
327 | if (IS_ENABLED(CONFIG_OF)) | |
328 | of_pwmchip_remove(chip); | |
329 | ||
f051c466 | 330 | free_pwms(chip); |
0c2498f1 | 331 | |
0c2498f1 SH |
332 | out: |
333 | mutex_unlock(&pwm_lock); | |
0c2498f1 SH |
334 | return ret; |
335 | } | |
336 | EXPORT_SYMBOL_GPL(pwmchip_remove); | |
337 | ||
bcda91bf UKK |
338 | static void devm_pwmchip_remove(void *data) |
339 | { | |
340 | struct pwm_chip *chip = data; | |
341 | ||
342 | pwmchip_remove(chip); | |
343 | } | |
344 | ||
345 | int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip) | |
346 | { | |
347 | int ret; | |
348 | ||
349 | ret = pwmchip_add(chip); | |
350 | if (ret) | |
351 | return ret; | |
352 | ||
353 | return devm_add_action_or_reset(dev, devm_pwmchip_remove, chip); | |
354 | } | |
355 | EXPORT_SYMBOL_GPL(devm_pwmchip_add); | |
356 | ||
0c2498f1 SH |
357 | /** |
358 | * pwm_request() - request a PWM device | |
04883802 | 359 | * @pwm: global PWM device index |
0c2498f1 | 360 | * @label: PWM device label |
8138d2dd TR |
361 | * |
362 | * This function is deprecated, use pwm_get() instead. | |
04883802 TR |
363 | * |
364 | * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on | |
365 | * failure. | |
0c2498f1 | 366 | */ |
f051c466 | 367 | struct pwm_device *pwm_request(int pwm, const char *label) |
0c2498f1 | 368 | { |
f051c466 TR |
369 | struct pwm_device *dev; |
370 | int err; | |
371 | ||
372 | if (pwm < 0 || pwm >= MAX_PWMS) | |
373 | return ERR_PTR(-EINVAL); | |
0c2498f1 SH |
374 | |
375 | mutex_lock(&pwm_lock); | |
376 | ||
f051c466 TR |
377 | dev = pwm_to_device(pwm); |
378 | if (!dev) { | |
379 | dev = ERR_PTR(-EPROBE_DEFER); | |
0c2498f1 SH |
380 | goto out; |
381 | } | |
382 | ||
f051c466 TR |
383 | err = pwm_device_request(dev, label); |
384 | if (err < 0) | |
385 | dev = ERR_PTR(err); | |
0c2498f1 | 386 | |
f051c466 TR |
387 | out: |
388 | mutex_unlock(&pwm_lock); | |
0c2498f1 | 389 | |
f051c466 TR |
390 | return dev; |
391 | } | |
392 | EXPORT_SYMBOL_GPL(pwm_request); | |
0c2498f1 | 393 | |
f051c466 TR |
394 | /** |
395 | * pwm_request_from_chip() - request a PWM device relative to a PWM chip | |
396 | * @chip: PWM chip | |
397 | * @index: per-chip index of the PWM to request | |
398 | * @label: a literal description string of this PWM | |
399 | * | |
04883802 TR |
400 | * Returns: A pointer to the PWM device at the given index of the given PWM |
401 | * chip. A negative error code is returned if the index is not valid for the | |
402 | * specified PWM chip or if the PWM device cannot be requested. | |
f051c466 TR |
403 | */ |
404 | struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, | |
405 | unsigned int index, | |
406 | const char *label) | |
407 | { | |
408 | struct pwm_device *pwm; | |
409 | int err; | |
0c2498f1 | 410 | |
f051c466 TR |
411 | if (!chip || index >= chip->npwm) |
412 | return ERR_PTR(-EINVAL); | |
0c2498f1 | 413 | |
f051c466 TR |
414 | mutex_lock(&pwm_lock); |
415 | pwm = &chip->pwms[index]; | |
0c2498f1 | 416 | |
f051c466 TR |
417 | err = pwm_device_request(pwm, label); |
418 | if (err < 0) | |
419 | pwm = ERR_PTR(err); | |
420 | ||
421 | mutex_unlock(&pwm_lock); | |
0c2498f1 SH |
422 | return pwm; |
423 | } | |
f051c466 | 424 | EXPORT_SYMBOL_GPL(pwm_request_from_chip); |
0c2498f1 SH |
425 | |
426 | /** | |
427 | * pwm_free() - free a PWM device | |
428 | * @pwm: PWM device | |
8138d2dd TR |
429 | * |
430 | * This function is deprecated, use pwm_put() instead. | |
0c2498f1 SH |
431 | */ |
432 | void pwm_free(struct pwm_device *pwm) | |
433 | { | |
8138d2dd | 434 | pwm_put(pwm); |
0c2498f1 SH |
435 | } |
436 | EXPORT_SYMBOL_GPL(pwm_free); | |
437 | ||
374c1104 JY |
438 | static void pwm_apply_state_debug(struct pwm_device *pwm, |
439 | const struct pwm_state *state) | |
3ad1f3a3 UKK |
440 | { |
441 | struct pwm_state *last = &pwm->last; | |
442 | struct pwm_chip *chip = pwm->chip; | |
443 | struct pwm_state s1, s2; | |
444 | int err; | |
445 | ||
446 | if (!IS_ENABLED(CONFIG_PWM_DEBUG)) | |
447 | return; | |
448 | ||
449 | /* No reasonable diagnosis possible without .get_state() */ | |
450 | if (!chip->ops->get_state) | |
451 | return; | |
452 | ||
453 | /* | |
454 | * *state was just applied. Read out the hardware state and do some | |
455 | * checks. | |
456 | */ | |
457 | ||
458 | chip->ops->get_state(chip, pwm, &s1); | |
459 | trace_pwm_get(pwm, &s1); | |
460 | ||
461 | /* | |
462 | * The lowlevel driver either ignored .polarity (which is a bug) or as | |
463 | * best effort inverted .polarity and fixed .duty_cycle respectively. | |
464 | * Undo this inversion and fixup for further tests. | |
465 | */ | |
466 | if (s1.enabled && s1.polarity != state->polarity) { | |
467 | s2.polarity = state->polarity; | |
468 | s2.duty_cycle = s1.period - s1.duty_cycle; | |
469 | s2.period = s1.period; | |
470 | s2.enabled = s1.enabled; | |
471 | } else { | |
472 | s2 = s1; | |
473 | } | |
474 | ||
475 | if (s2.polarity != state->polarity && | |
476 | state->duty_cycle < state->period) | |
477 | dev_warn(chip->dev, ".apply ignored .polarity\n"); | |
478 | ||
479 | if (state->enabled && | |
480 | last->polarity == state->polarity && | |
481 | last->period > s2.period && | |
482 | last->period <= state->period) | |
483 | dev_warn(chip->dev, | |
a9d887dc | 484 | ".apply didn't pick the best available period (requested: %llu, applied: %llu, possible: %llu)\n", |
3ad1f3a3 UKK |
485 | state->period, s2.period, last->period); |
486 | ||
487 | if (state->enabled && state->period < s2.period) | |
488 | dev_warn(chip->dev, | |
a9d887dc | 489 | ".apply is supposed to round down period (requested: %llu, applied: %llu)\n", |
3ad1f3a3 UKK |
490 | state->period, s2.period); |
491 | ||
492 | if (state->enabled && | |
493 | last->polarity == state->polarity && | |
494 | last->period == s2.period && | |
495 | last->duty_cycle > s2.duty_cycle && | |
496 | last->duty_cycle <= state->duty_cycle) | |
497 | dev_warn(chip->dev, | |
a9d887dc | 498 | ".apply didn't pick the best available duty cycle (requested: %llu/%llu, applied: %llu/%llu, possible: %llu/%llu)\n", |
3ad1f3a3 UKK |
499 | state->duty_cycle, state->period, |
500 | s2.duty_cycle, s2.period, | |
501 | last->duty_cycle, last->period); | |
502 | ||
503 | if (state->enabled && state->duty_cycle < s2.duty_cycle) | |
504 | dev_warn(chip->dev, | |
a9d887dc | 505 | ".apply is supposed to round down duty_cycle (requested: %llu/%llu, applied: %llu/%llu)\n", |
3ad1f3a3 UKK |
506 | state->duty_cycle, state->period, |
507 | s2.duty_cycle, s2.period); | |
508 | ||
509 | if (!state->enabled && s2.enabled && s2.duty_cycle > 0) | |
510 | dev_warn(chip->dev, | |
db539cb9 | 511 | "requested disabled, but yielded enabled with duty > 0\n"); |
3ad1f3a3 UKK |
512 | |
513 | /* reapply the state that the driver reported being configured. */ | |
514 | err = chip->ops->apply(chip, pwm, &s1); | |
515 | if (err) { | |
516 | *last = s1; | |
517 | dev_err(chip->dev, "failed to reapply current setting\n"); | |
518 | return; | |
519 | } | |
520 | ||
521 | trace_pwm_apply(pwm, &s1); | |
522 | ||
523 | chip->ops->get_state(chip, pwm, last); | |
524 | trace_pwm_get(pwm, last); | |
525 | ||
526 | /* reapplication of the current state should give an exact match */ | |
527 | if (s1.enabled != last->enabled || | |
528 | s1.polarity != last->polarity || | |
529 | (s1.enabled && s1.period != last->period) || | |
530 | (s1.enabled && s1.duty_cycle != last->duty_cycle)) { | |
531 | dev_err(chip->dev, | |
a9d887dc | 532 | ".apply is not idempotent (ena=%d pol=%d %llu/%llu) -> (ena=%d pol=%d %llu/%llu)\n", |
3ad1f3a3 UKK |
533 | s1.enabled, s1.polarity, s1.duty_cycle, s1.period, |
534 | last->enabled, last->polarity, last->duty_cycle, | |
535 | last->period); | |
536 | } | |
537 | } | |
538 | ||
0c2498f1 | 539 | /** |
5ec803ed | 540 | * pwm_apply_state() - atomically apply a new state to a PWM device |
0c2498f1 | 541 | * @pwm: PWM device |
71523d18 | 542 | * @state: new state to apply |
0c2498f1 | 543 | */ |
71523d18 | 544 | int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) |
0c2498f1 | 545 | { |
fc3c5512 | 546 | struct pwm_chip *chip; |
76abbdde HS |
547 | int err; |
548 | ||
ef2bf499 BN |
549 | if (!pwm || !state || !state->period || |
550 | state->duty_cycle > state->period) | |
f051c466 TR |
551 | return -EINVAL; |
552 | ||
fc3c5512 UKK |
553 | chip = pwm->chip; |
554 | ||
309b32fb UKK |
555 | if (state->period == pwm->state.period && |
556 | state->duty_cycle == pwm->state.duty_cycle && | |
557 | state->polarity == pwm->state.polarity && | |
9e40ee18 CG |
558 | state->enabled == pwm->state.enabled && |
559 | state->usage_power == pwm->state.usage_power) | |
5ec803ed | 560 | return 0; |
76abbdde | 561 | |
fc3c5512 UKK |
562 | if (chip->ops->apply) { |
563 | err = chip->ops->apply(chip, pwm, state); | |
5ec803ed BB |
564 | if (err) |
565 | return err; | |
0c2498f1 | 566 | |
1188829a UKK |
567 | trace_pwm_apply(pwm, state); |
568 | ||
40a6b9a0 | 569 | pwm->state = *state; |
3ad1f3a3 UKK |
570 | |
571 | /* | |
572 | * only do this after pwm->state was applied as some | |
573 | * implementations of .get_state depend on this | |
574 | */ | |
575 | pwm_apply_state_debug(pwm, state); | |
5ec803ed BB |
576 | } else { |
577 | /* | |
578 | * FIXME: restore the initial state in case of error. | |
579 | */ | |
580 | if (state->polarity != pwm->state.polarity) { | |
fc3c5512 | 581 | if (!chip->ops->set_polarity) |
d58cb0ee | 582 | return -EINVAL; |
5ec803ed BB |
583 | |
584 | /* | |
585 | * Changing the polarity of a running PWM is | |
586 | * only allowed when the PWM driver implements | |
587 | * ->apply(). | |
588 | */ | |
589 | if (pwm->state.enabled) { | |
fc3c5512 | 590 | chip->ops->disable(chip, pwm); |
5ec803ed BB |
591 | pwm->state.enabled = false; |
592 | } | |
593 | ||
fc3c5512 UKK |
594 | err = chip->ops->set_polarity(chip, pwm, |
595 | state->polarity); | |
5ec803ed BB |
596 | if (err) |
597 | return err; | |
598 | ||
599 | pwm->state.polarity = state->polarity; | |
600 | } | |
76abbdde | 601 | |
5ec803ed BB |
602 | if (state->period != pwm->state.period || |
603 | state->duty_cycle != pwm->state.duty_cycle) { | |
fc3c5512 UKK |
604 | err = chip->ops->config(pwm->chip, pwm, |
605 | state->duty_cycle, | |
606 | state->period); | |
5ec803ed BB |
607 | if (err) |
608 | return err; | |
0aa0869c | 609 | |
5ec803ed BB |
610 | pwm->state.duty_cycle = state->duty_cycle; |
611 | pwm->state.period = state->period; | |
612 | } | |
0aa0869c | 613 | |
5ec803ed BB |
614 | if (state->enabled != pwm->state.enabled) { |
615 | if (state->enabled) { | |
fc3c5512 | 616 | err = chip->ops->enable(chip, pwm); |
5ec803ed BB |
617 | if (err) |
618 | return err; | |
619 | } else { | |
fc3c5512 | 620 | chip->ops->disable(chip, pwm); |
5ec803ed | 621 | } |
d1cd2142 | 622 | |
5ec803ed BB |
623 | pwm->state.enabled = state->enabled; |
624 | } | |
d1cd2142 | 625 | } |
0aa0869c | 626 | |
459a25af | 627 | return 0; |
0aa0869c | 628 | } |
5ec803ed | 629 | EXPORT_SYMBOL_GPL(pwm_apply_state); |
0aa0869c | 630 | |
3a3d1a4e LJ |
631 | /** |
632 | * pwm_capture() - capture and report a PWM signal | |
633 | * @pwm: PWM device | |
634 | * @result: structure to fill with capture result | |
635 | * @timeout: time to wait, in milliseconds, before giving up on capture | |
636 | * | |
637 | * Returns: 0 on success or a negative error code on failure. | |
638 | */ | |
639 | int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, | |
640 | unsigned long timeout) | |
641 | { | |
642 | int err; | |
643 | ||
644 | if (!pwm || !pwm->chip->ops) | |
645 | return -EINVAL; | |
646 | ||
647 | if (!pwm->chip->ops->capture) | |
648 | return -ENOSYS; | |
649 | ||
650 | mutex_lock(&pwm_lock); | |
651 | err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout); | |
652 | mutex_unlock(&pwm_lock); | |
653 | ||
654 | return err; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(pwm_capture); | |
657 | ||
0c2498f1 | 658 | /** |
5ec803ed | 659 | * pwm_adjust_config() - adjust the current PWM config to the PWM arguments |
0c2498f1 | 660 | * @pwm: PWM device |
04883802 | 661 | * |
5ec803ed BB |
662 | * This function will adjust the PWM config to the PWM arguments provided |
663 | * by the DT or PWM lookup table. This is particularly useful to adapt | |
664 | * the bootloader config to the Linux one. | |
0c2498f1 | 665 | */ |
5ec803ed | 666 | int pwm_adjust_config(struct pwm_device *pwm) |
0c2498f1 | 667 | { |
5ec803ed BB |
668 | struct pwm_state state; |
669 | struct pwm_args pargs; | |
d1cd2142 | 670 | |
5ec803ed BB |
671 | pwm_get_args(pwm, &pargs); |
672 | pwm_get_state(pwm, &state); | |
d1cd2142 | 673 | |
5ec803ed BB |
674 | /* |
675 | * If the current period is zero it means that either the PWM driver | |
676 | * does not support initial state retrieval or the PWM has not yet | |
677 | * been configured. | |
678 | * | |
679 | * In either case, we setup the new period and polarity, and assign a | |
680 | * duty cycle of 0. | |
681 | */ | |
682 | if (!state.period) { | |
683 | state.duty_cycle = 0; | |
684 | state.period = pargs.period; | |
685 | state.polarity = pargs.polarity; | |
d1cd2142 | 686 | |
5ec803ed | 687 | return pwm_apply_state(pwm, &state); |
d1cd2142 JR |
688 | } |
689 | ||
5ec803ed BB |
690 | /* |
691 | * Adjust the PWM duty cycle/period based on the period value provided | |
692 | * in PWM args. | |
693 | */ | |
694 | if (pargs.period != state.period) { | |
695 | u64 dutycycle = (u64)state.duty_cycle * pargs.period; | |
0c2498f1 | 696 | |
5ec803ed BB |
697 | do_div(dutycycle, state.period); |
698 | state.duty_cycle = dutycycle; | |
699 | state.period = pargs.period; | |
700 | } | |
0c2498f1 | 701 | |
5ec803ed BB |
702 | /* |
703 | * If the polarity changed, we should also change the duty cycle. | |
704 | */ | |
705 | if (pargs.polarity != state.polarity) { | |
706 | state.polarity = pargs.polarity; | |
707 | state.duty_cycle = state.period - state.duty_cycle; | |
09a7e4a3 | 708 | } |
5ec803ed BB |
709 | |
710 | return pwm_apply_state(pwm, &state); | |
0c2498f1 | 711 | } |
5ec803ed | 712 | EXPORT_SYMBOL_GPL(pwm_adjust_config); |
62099abf | 713 | |
7299ab70 TR |
714 | static struct pwm_chip *of_node_to_pwmchip(struct device_node *np) |
715 | { | |
716 | struct pwm_chip *chip; | |
717 | ||
718 | mutex_lock(&pwm_lock); | |
719 | ||
720 | list_for_each_entry(chip, &pwm_chips, list) | |
721 | if (chip->dev && chip->dev->of_node == np) { | |
722 | mutex_unlock(&pwm_lock); | |
723 | return chip; | |
724 | } | |
725 | ||
726 | mutex_unlock(&pwm_lock); | |
727 | ||
728 | return ERR_PTR(-EPROBE_DEFER); | |
729 | } | |
730 | ||
b2c200e3 FG |
731 | static struct device_link *pwm_device_link_add(struct device *dev, |
732 | struct pwm_device *pwm) | |
733 | { | |
734 | struct device_link *dl; | |
735 | ||
736 | if (!dev) { | |
737 | /* | |
738 | * No device for the PWM consumer has been provided. It may | |
739 | * impact the PM sequence ordering: the PWM supplier may get | |
740 | * suspended before the consumer. | |
741 | */ | |
742 | dev_warn(pwm->chip->dev, | |
743 | "No consumer device specified to create a link to\n"); | |
744 | return NULL; | |
745 | } | |
746 | ||
747 | dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER); | |
748 | if (!dl) { | |
749 | dev_err(dev, "failed to create device link to %s\n", | |
750 | dev_name(pwm->chip->dev)); | |
751 | return ERR_PTR(-EINVAL); | |
752 | } | |
753 | ||
754 | return dl; | |
755 | } | |
756 | ||
7299ab70 | 757 | /** |
8eb96127 | 758 | * of_pwm_get() - request a PWM via the PWM framework |
b2c200e3 | 759 | * @dev: device for PWM consumer |
7299ab70 TR |
760 | * @np: device node to get the PWM from |
761 | * @con_id: consumer name | |
762 | * | |
763 | * Returns the PWM device parsed from the phandle and index specified in the | |
764 | * "pwms" property of a device tree node or a negative error-code on failure. | |
765 | * Values parsed from the device tree are stored in the returned PWM device | |
766 | * object. | |
767 | * | |
768 | * If con_id is NULL, the first PWM device listed in the "pwms" property will | |
769 | * be requested. Otherwise the "pwm-names" property is used to do a reverse | |
770 | * lookup of the PWM index. This also means that the "pwm-names" property | |
771 | * becomes mandatory for devices that look up the PWM device via the con_id | |
772 | * parameter. | |
04883802 TR |
773 | * |
774 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
775 | * error code on failure. | |
7299ab70 | 776 | */ |
b2c200e3 FG |
777 | struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np, |
778 | const char *con_id) | |
7299ab70 TR |
779 | { |
780 | struct pwm_device *pwm = NULL; | |
781 | struct of_phandle_args args; | |
b2c200e3 | 782 | struct device_link *dl; |
7299ab70 TR |
783 | struct pwm_chip *pc; |
784 | int index = 0; | |
785 | int err; | |
786 | ||
787 | if (con_id) { | |
788 | index = of_property_match_string(np, "pwm-names", con_id); | |
789 | if (index < 0) | |
790 | return ERR_PTR(index); | |
791 | } | |
792 | ||
793 | err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index, | |
794 | &args); | |
795 | if (err) { | |
f2dafc09 | 796 | pr_err("%s(): can't parse \"pwms\" property\n", __func__); |
7299ab70 TR |
797 | return ERR_PTR(err); |
798 | } | |
799 | ||
800 | pc = of_node_to_pwmchip(args.np); | |
801 | if (IS_ERR(pc)) { | |
93c292ef JB |
802 | if (PTR_ERR(pc) != -EPROBE_DEFER) |
803 | pr_err("%s(): PWM chip not found\n", __func__); | |
804 | ||
7299ab70 TR |
805 | pwm = ERR_CAST(pc); |
806 | goto put; | |
807 | } | |
808 | ||
7299ab70 TR |
809 | pwm = pc->of_xlate(pc, &args); |
810 | if (IS_ERR(pwm)) | |
811 | goto put; | |
812 | ||
b2c200e3 FG |
813 | dl = pwm_device_link_add(dev, pwm); |
814 | if (IS_ERR(dl)) { | |
815 | /* of_xlate ended up calling pwm_request_from_chip() */ | |
816 | pwm_free(pwm); | |
817 | pwm = ERR_CAST(dl); | |
818 | goto put; | |
819 | } | |
820 | ||
7299ab70 TR |
821 | /* |
822 | * If a consumer name was not given, try to look it up from the | |
823 | * "pwm-names" property if it exists. Otherwise use the name of | |
824 | * the user device node. | |
825 | */ | |
826 | if (!con_id) { | |
827 | err = of_property_read_string_index(np, "pwm-names", index, | |
828 | &con_id); | |
829 | if (err < 0) | |
830 | con_id = np->name; | |
831 | } | |
832 | ||
833 | pwm->label = con_id; | |
834 | ||
835 | put: | |
836 | of_node_put(args.np); | |
837 | ||
838 | return pwm; | |
839 | } | |
8eb96127 | 840 | EXPORT_SYMBOL_GPL(of_pwm_get); |
7299ab70 | 841 | |
4a6ef8e3 NV |
842 | #if IS_ENABLED(CONFIG_ACPI) |
843 | static struct pwm_chip *device_to_pwmchip(struct device *dev) | |
844 | { | |
845 | struct pwm_chip *chip; | |
846 | ||
847 | mutex_lock(&pwm_lock); | |
848 | ||
849 | list_for_each_entry(chip, &pwm_chips, list) { | |
850 | struct acpi_device *adev = ACPI_COMPANION(chip->dev); | |
851 | ||
852 | if ((chip->dev == dev) || (adev && &adev->dev == dev)) { | |
853 | mutex_unlock(&pwm_lock); | |
854 | return chip; | |
855 | } | |
856 | } | |
857 | ||
858 | mutex_unlock(&pwm_lock); | |
859 | ||
860 | return ERR_PTR(-EPROBE_DEFER); | |
861 | } | |
862 | #endif | |
863 | ||
864 | /** | |
865 | * acpi_pwm_get() - request a PWM via parsing "pwms" property in ACPI | |
866 | * @fwnode: firmware node to get the "pwm" property from | |
867 | * | |
868 | * Returns the PWM device parsed from the fwnode and index specified in the | |
869 | * "pwms" property or a negative error-code on failure. | |
870 | * Values parsed from the device tree are stored in the returned PWM device | |
871 | * object. | |
872 | * | |
873 | * This is analogous to of_pwm_get() except con_id is not yet supported. | |
874 | * ACPI entries must look like | |
875 | * Package () {"pwms", Package () | |
876 | * { <PWM device reference>, <PWM index>, <PWM period> [, <PWM flags>]}} | |
877 | * | |
878 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
879 | * error code on failure. | |
880 | */ | |
881 | static struct pwm_device *acpi_pwm_get(struct fwnode_handle *fwnode) | |
882 | { | |
883 | struct pwm_device *pwm = ERR_PTR(-ENODEV); | |
884 | #if IS_ENABLED(CONFIG_ACPI) | |
885 | struct fwnode_reference_args args; | |
886 | struct acpi_device *acpi; | |
887 | struct pwm_chip *chip; | |
888 | int ret; | |
889 | ||
890 | memset(&args, 0, sizeof(args)); | |
891 | ||
892 | ret = __acpi_node_get_property_reference(fwnode, "pwms", 0, 3, &args); | |
893 | if (ret < 0) | |
894 | return ERR_PTR(ret); | |
895 | ||
896 | acpi = to_acpi_device_node(args.fwnode); | |
897 | if (!acpi) | |
898 | return ERR_PTR(-EINVAL); | |
899 | ||
900 | if (args.nargs < 2) | |
901 | return ERR_PTR(-EPROTO); | |
902 | ||
903 | chip = device_to_pwmchip(&acpi->dev); | |
904 | if (IS_ERR(chip)) | |
905 | return ERR_CAST(chip); | |
906 | ||
907 | pwm = pwm_request_from_chip(chip, args.args[0], NULL); | |
908 | if (IS_ERR(pwm)) | |
909 | return pwm; | |
910 | ||
911 | pwm->args.period = args.args[1]; | |
912 | pwm->args.polarity = PWM_POLARITY_NORMAL; | |
913 | ||
914 | if (args.nargs > 2 && args.args[2] & PWM_POLARITY_INVERTED) | |
915 | pwm->args.polarity = PWM_POLARITY_INVERSED; | |
916 | #endif | |
917 | ||
918 | return pwm; | |
919 | } | |
920 | ||
8138d2dd TR |
921 | /** |
922 | * pwm_add_table() - register PWM device consumers | |
923 | * @table: array of consumers to register | |
924 | * @num: number of consumers in table | |
925 | */ | |
c264f111 | 926 | void pwm_add_table(struct pwm_lookup *table, size_t num) |
8138d2dd TR |
927 | { |
928 | mutex_lock(&pwm_lookup_lock); | |
929 | ||
930 | while (num--) { | |
931 | list_add_tail(&table->list, &pwm_lookup_list); | |
932 | table++; | |
933 | } | |
934 | ||
935 | mutex_unlock(&pwm_lookup_lock); | |
936 | } | |
937 | ||
efb0de55 SK |
938 | /** |
939 | * pwm_remove_table() - unregister PWM device consumers | |
940 | * @table: array of consumers to unregister | |
941 | * @num: number of consumers in table | |
942 | */ | |
943 | void pwm_remove_table(struct pwm_lookup *table, size_t num) | |
944 | { | |
945 | mutex_lock(&pwm_lookup_lock); | |
946 | ||
947 | while (num--) { | |
948 | list_del(&table->list); | |
949 | table++; | |
950 | } | |
951 | ||
952 | mutex_unlock(&pwm_lookup_lock); | |
953 | } | |
954 | ||
8138d2dd TR |
955 | /** |
956 | * pwm_get() - look up and request a PWM device | |
957 | * @dev: device for PWM consumer | |
958 | * @con_id: consumer name | |
959 | * | |
7299ab70 TR |
960 | * Lookup is first attempted using DT. If the device was not instantiated from |
961 | * a device tree, a PWM chip and a relative index is looked up via a table | |
962 | * supplied by board setup code (see pwm_add_table()). | |
8138d2dd TR |
963 | * |
964 | * Once a PWM chip has been found the specified PWM device will be requested | |
965 | * and is ready to be used. | |
04883802 TR |
966 | * |
967 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
968 | * error code on failure. | |
8138d2dd TR |
969 | */ |
970 | struct pwm_device *pwm_get(struct device *dev, const char *con_id) | |
971 | { | |
e50d3523 | 972 | const char *dev_id = dev ? dev_name(dev) : NULL; |
69efb343 HG |
973 | struct pwm_device *pwm; |
974 | struct pwm_chip *chip; | |
b2c200e3 | 975 | struct device_link *dl; |
8138d2dd | 976 | unsigned int best = 0; |
70145f87 | 977 | struct pwm_lookup *p, *chosen = NULL; |
8138d2dd | 978 | unsigned int match; |
b526a314 | 979 | int err; |
8138d2dd | 980 | |
7299ab70 TR |
981 | /* look up via DT first */ |
982 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
b2c200e3 | 983 | return of_pwm_get(dev, dev->of_node, con_id); |
7299ab70 | 984 | |
4a6ef8e3 | 985 | /* then lookup via ACPI */ |
6cf9481b HG |
986 | if (dev && is_acpi_node(dev->fwnode)) { |
987 | pwm = acpi_pwm_get(dev->fwnode); | |
988 | if (!IS_ERR(pwm) || PTR_ERR(pwm) != -ENOENT) | |
989 | return pwm; | |
990 | } | |
7299ab70 | 991 | |
8138d2dd TR |
992 | /* |
993 | * We look up the provider in the static table typically provided by | |
994 | * board setup code. We first try to lookup the consumer device by | |
995 | * name. If the consumer device was passed in as NULL or if no match | |
996 | * was found, we try to find the consumer by directly looking it up | |
997 | * by name. | |
998 | * | |
999 | * If a match is found, the provider PWM chip is looked up by name | |
1000 | * and a PWM device is requested using the PWM device per-chip index. | |
1001 | * | |
1002 | * The lookup algorithm was shamelessly taken from the clock | |
1003 | * framework: | |
1004 | * | |
1005 | * We do slightly fuzzy matching here: | |
1006 | * An entry with a NULL ID is assumed to be a wildcard. | |
1007 | * If an entry has a device ID, it must match | |
1008 | * If an entry has a connection ID, it must match | |
1009 | * Then we take the most specific entry - with the following order | |
1010 | * of precedence: dev+con > dev only > con only. | |
1011 | */ | |
1012 | mutex_lock(&pwm_lookup_lock); | |
1013 | ||
1014 | list_for_each_entry(p, &pwm_lookup_list, list) { | |
1015 | match = 0; | |
1016 | ||
1017 | if (p->dev_id) { | |
1018 | if (!dev_id || strcmp(p->dev_id, dev_id)) | |
1019 | continue; | |
1020 | ||
1021 | match += 2; | |
1022 | } | |
1023 | ||
1024 | if (p->con_id) { | |
1025 | if (!con_id || strcmp(p->con_id, con_id)) | |
1026 | continue; | |
1027 | ||
1028 | match += 1; | |
1029 | } | |
1030 | ||
1031 | if (match > best) { | |
70145f87 | 1032 | chosen = p; |
8138d2dd TR |
1033 | |
1034 | if (match != 3) | |
1035 | best = match; | |
1036 | else | |
1037 | break; | |
1038 | } | |
1039 | } | |
1040 | ||
69efb343 HG |
1041 | mutex_unlock(&pwm_lookup_lock); |
1042 | ||
1043 | if (!chosen) | |
1044 | return ERR_PTR(-ENODEV); | |
3796ce1d | 1045 | |
70145f87 | 1046 | chip = pwmchip_find_by_name(chosen->provider); |
b526a314 HG |
1047 | |
1048 | /* | |
1049 | * If the lookup entry specifies a module, load the module and retry | |
1050 | * the PWM chip lookup. This can be used to work around driver load | |
1051 | * ordering issues if driver's can't be made to properly support the | |
1052 | * deferred probe mechanism. | |
1053 | */ | |
1054 | if (!chip && chosen->module) { | |
1055 | err = request_module(chosen->module); | |
1056 | if (err == 0) | |
1057 | chip = pwmchip_find_by_name(chosen->provider); | |
1058 | } | |
1059 | ||
70145f87 | 1060 | if (!chip) |
69efb343 | 1061 | return ERR_PTR(-EPROBE_DEFER); |
3796ce1d | 1062 | |
70145f87 GU |
1063 | pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id); |
1064 | if (IS_ERR(pwm)) | |
69efb343 | 1065 | return pwm; |
8138d2dd | 1066 | |
b2c200e3 FG |
1067 | dl = pwm_device_link_add(dev, pwm); |
1068 | if (IS_ERR(dl)) { | |
1069 | pwm_free(pwm); | |
1070 | return ERR_CAST(dl); | |
1071 | } | |
1072 | ||
fbd45a12 BB |
1073 | pwm->args.period = chosen->period; |
1074 | pwm->args.polarity = chosen->polarity; | |
1075 | ||
8138d2dd TR |
1076 | return pwm; |
1077 | } | |
1078 | EXPORT_SYMBOL_GPL(pwm_get); | |
1079 | ||
1080 | /** | |
1081 | * pwm_put() - release a PWM device | |
1082 | * @pwm: PWM device | |
1083 | */ | |
1084 | void pwm_put(struct pwm_device *pwm) | |
1085 | { | |
1086 | if (!pwm) | |
1087 | return; | |
1088 | ||
1089 | mutex_lock(&pwm_lock); | |
1090 | ||
1091 | if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) { | |
e50d3523 | 1092 | pr_warn("PWM device already freed\n"); |
8138d2dd TR |
1093 | goto out; |
1094 | } | |
1095 | ||
1096 | if (pwm->chip->ops->free) | |
1097 | pwm->chip->ops->free(pwm->chip, pwm); | |
1098 | ||
e926b12c | 1099 | pwm_set_chip_data(pwm, NULL); |
8138d2dd TR |
1100 | pwm->label = NULL; |
1101 | ||
1102 | module_put(pwm->chip->ops->owner); | |
1103 | out: | |
1104 | mutex_unlock(&pwm_lock); | |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(pwm_put); | |
1107 | ||
6354316d AC |
1108 | static void devm_pwm_release(struct device *dev, void *res) |
1109 | { | |
1110 | pwm_put(*(struct pwm_device **)res); | |
1111 | } | |
1112 | ||
1113 | /** | |
1114 | * devm_pwm_get() - resource managed pwm_get() | |
1115 | * @dev: device for PWM consumer | |
1116 | * @con_id: consumer name | |
1117 | * | |
1118 | * This function performs like pwm_get() but the acquired PWM device will | |
1119 | * automatically be released on driver detach. | |
04883802 TR |
1120 | * |
1121 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1122 | * error code on failure. | |
6354316d AC |
1123 | */ |
1124 | struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id) | |
1125 | { | |
1126 | struct pwm_device **ptr, *pwm; | |
1127 | ||
77f0b9d2 | 1128 | ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL); |
6354316d AC |
1129 | if (!ptr) |
1130 | return ERR_PTR(-ENOMEM); | |
1131 | ||
1132 | pwm = pwm_get(dev, con_id); | |
1133 | if (!IS_ERR(pwm)) { | |
1134 | *ptr = pwm; | |
1135 | devres_add(dev, ptr); | |
1136 | } else { | |
1137 | devres_free(ptr); | |
1138 | } | |
1139 | ||
1140 | return pwm; | |
1141 | } | |
1142 | EXPORT_SYMBOL_GPL(devm_pwm_get); | |
1143 | ||
261a5edd PU |
1144 | /** |
1145 | * devm_of_pwm_get() - resource managed of_pwm_get() | |
1146 | * @dev: device for PWM consumer | |
1147 | * @np: device node to get the PWM from | |
1148 | * @con_id: consumer name | |
1149 | * | |
1150 | * This function performs like of_pwm_get() but the acquired PWM device will | |
1151 | * automatically be released on driver detach. | |
04883802 TR |
1152 | * |
1153 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1154 | * error code on failure. | |
261a5edd PU |
1155 | */ |
1156 | struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np, | |
1157 | const char *con_id) | |
1158 | { | |
1159 | struct pwm_device **ptr, *pwm; | |
1160 | ||
77f0b9d2 | 1161 | ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL); |
261a5edd PU |
1162 | if (!ptr) |
1163 | return ERR_PTR(-ENOMEM); | |
1164 | ||
b2c200e3 | 1165 | pwm = of_pwm_get(dev, np, con_id); |
261a5edd PU |
1166 | if (!IS_ERR(pwm)) { |
1167 | *ptr = pwm; | |
1168 | devres_add(dev, ptr); | |
1169 | } else { | |
1170 | devres_free(ptr); | |
1171 | } | |
1172 | ||
1173 | return pwm; | |
1174 | } | |
1175 | EXPORT_SYMBOL_GPL(devm_of_pwm_get); | |
1176 | ||
4a6ef8e3 NV |
1177 | /** |
1178 | * devm_fwnode_pwm_get() - request a resource managed PWM from firmware node | |
1179 | * @dev: device for PWM consumer | |
1180 | * @fwnode: firmware node to get the PWM from | |
1181 | * @con_id: consumer name | |
1182 | * | |
1183 | * Returns the PWM device parsed from the firmware node. See of_pwm_get() and | |
1184 | * acpi_pwm_get() for a detailed description. | |
1185 | * | |
1186 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1187 | * error code on failure. | |
1188 | */ | |
1189 | struct pwm_device *devm_fwnode_pwm_get(struct device *dev, | |
1190 | struct fwnode_handle *fwnode, | |
1191 | const char *con_id) | |
1192 | { | |
1193 | struct pwm_device **ptr, *pwm = ERR_PTR(-ENODEV); | |
1194 | ||
1195 | ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL); | |
1196 | if (!ptr) | |
1197 | return ERR_PTR(-ENOMEM); | |
1198 | ||
1199 | if (is_of_node(fwnode)) | |
1200 | pwm = of_pwm_get(dev, to_of_node(fwnode), con_id); | |
1201 | else if (is_acpi_node(fwnode)) | |
1202 | pwm = acpi_pwm_get(fwnode); | |
1203 | ||
1204 | if (!IS_ERR(pwm)) { | |
1205 | *ptr = pwm; | |
1206 | devres_add(dev, ptr); | |
1207 | } else { | |
1208 | devres_free(ptr); | |
1209 | } | |
1210 | ||
1211 | return pwm; | |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get); | |
1214 | ||
6354316d AC |
1215 | static int devm_pwm_match(struct device *dev, void *res, void *data) |
1216 | { | |
1217 | struct pwm_device **p = res; | |
1218 | ||
1219 | if (WARN_ON(!p || !*p)) | |
1220 | return 0; | |
1221 | ||
1222 | return *p == data; | |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * devm_pwm_put() - resource managed pwm_put() | |
1227 | * @dev: device for PWM consumer | |
1228 | * @pwm: PWM device | |
1229 | * | |
1230 | * Release a PWM previously allocated using devm_pwm_get(). Calling this | |
1231 | * function is usually not needed because devm-allocated resources are | |
1232 | * automatically released on driver detach. | |
1233 | */ | |
1234 | void devm_pwm_put(struct device *dev, struct pwm_device *pwm) | |
1235 | { | |
1236 | WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm)); | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(devm_pwm_put); | |
1239 | ||
62099abf TR |
1240 | #ifdef CONFIG_DEBUG_FS |
1241 | static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s) | |
1242 | { | |
1243 | unsigned int i; | |
1244 | ||
1245 | for (i = 0; i < chip->npwm; i++) { | |
1246 | struct pwm_device *pwm = &chip->pwms[i]; | |
39100cee BB |
1247 | struct pwm_state state; |
1248 | ||
1249 | pwm_get_state(pwm, &state); | |
62099abf TR |
1250 | |
1251 | seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label); | |
1252 | ||
1253 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) | |
adcba1e3 | 1254 | seq_puts(s, " requested"); |
62099abf | 1255 | |
39100cee | 1256 | if (state.enabled) |
adcba1e3 | 1257 | seq_puts(s, " enabled"); |
62099abf | 1258 | |
a9d887dc GDS |
1259 | seq_printf(s, " period: %llu ns", state.period); |
1260 | seq_printf(s, " duty: %llu ns", state.duty_cycle); | |
23e3523f HS |
1261 | seq_printf(s, " polarity: %s", |
1262 | state.polarity ? "inverse" : "normal"); | |
1263 | ||
9e40ee18 CG |
1264 | if (state.usage_power) |
1265 | seq_puts(s, " usage_power"); | |
1266 | ||
adcba1e3 | 1267 | seq_puts(s, "\n"); |
62099abf TR |
1268 | } |
1269 | } | |
1270 | ||
1271 | static void *pwm_seq_start(struct seq_file *s, loff_t *pos) | |
1272 | { | |
1273 | mutex_lock(&pwm_lock); | |
1274 | s->private = ""; | |
1275 | ||
1276 | return seq_list_start(&pwm_chips, *pos); | |
1277 | } | |
1278 | ||
1279 | static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1280 | { | |
1281 | s->private = "\n"; | |
1282 | ||
1283 | return seq_list_next(v, &pwm_chips, pos); | |
1284 | } | |
1285 | ||
1286 | static void pwm_seq_stop(struct seq_file *s, void *v) | |
1287 | { | |
1288 | mutex_unlock(&pwm_lock); | |
1289 | } | |
1290 | ||
1291 | static int pwm_seq_show(struct seq_file *s, void *v) | |
1292 | { | |
1293 | struct pwm_chip *chip = list_entry(v, struct pwm_chip, list); | |
1294 | ||
1295 | seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private, | |
1296 | chip->dev->bus ? chip->dev->bus->name : "no-bus", | |
1297 | dev_name(chip->dev), chip->npwm, | |
1298 | (chip->npwm != 1) ? "s" : ""); | |
1299 | ||
cc2d2247 | 1300 | pwm_dbg_show(chip, s); |
62099abf TR |
1301 | |
1302 | return 0; | |
1303 | } | |
1304 | ||
f339e79b | 1305 | static const struct seq_operations pwm_debugfs_sops = { |
62099abf TR |
1306 | .start = pwm_seq_start, |
1307 | .next = pwm_seq_next, | |
1308 | .stop = pwm_seq_stop, | |
1309 | .show = pwm_seq_show, | |
1310 | }; | |
1311 | ||
f339e79b | 1312 | DEFINE_SEQ_ATTRIBUTE(pwm_debugfs); |
62099abf TR |
1313 | |
1314 | static int __init pwm_debugfs_init(void) | |
1315 | { | |
765edf0b | 1316 | debugfs_create_file("pwm", S_IFREG | 0444, NULL, NULL, |
f339e79b | 1317 | &pwm_debugfs_fops); |
62099abf TR |
1318 | |
1319 | return 0; | |
1320 | } | |
62099abf TR |
1321 | subsys_initcall(pwm_debugfs_init); |
1322 | #endif /* CONFIG_DEBUG_FS */ |