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); | |
e51b156b | 30 | |
247ee6c7 | 31 | /* protects access to pwm_chips and allocated_pwms */ |
0c2498f1 | 32 | static DEFINE_MUTEX(pwm_lock); |
e51b156b | 33 | |
f051c466 TR |
34 | static LIST_HEAD(pwm_chips); |
35 | static DECLARE_BITMAP(allocated_pwms, MAX_PWMS); | |
0c2498f1 | 36 | |
e51b156b | 37 | /* Called with pwm_lock held */ |
f9a8ee8c | 38 | static int alloc_pwms(unsigned int count) |
f051c466 | 39 | { |
f051c466 TR |
40 | unsigned int start; |
41 | ||
f9a8ee8c | 42 | start = bitmap_find_next_zero_area(allocated_pwms, MAX_PWMS, 0, |
f051c466 TR |
43 | count, 0); |
44 | ||
f051c466 TR |
45 | if (start + count > MAX_PWMS) |
46 | return -ENOSPC; | |
47 | ||
4034e594 UKK |
48 | bitmap_set(allocated_pwms, start, count); |
49 | ||
f051c466 TR |
50 | return start; |
51 | } | |
52 | ||
e51b156b | 53 | /* Called with pwm_lock held */ |
f051c466 TR |
54 | static void free_pwms(struct pwm_chip *chip) |
55 | { | |
f051c466 TR |
56 | bitmap_clear(allocated_pwms, chip->base, chip->npwm); |
57 | ||
58 | kfree(chip->pwms); | |
59 | chip->pwms = NULL; | |
60 | } | |
61 | ||
8138d2dd TR |
62 | static struct pwm_chip *pwmchip_find_by_name(const char *name) |
63 | { | |
64 | struct pwm_chip *chip; | |
65 | ||
66 | if (!name) | |
67 | return NULL; | |
68 | ||
69 | mutex_lock(&pwm_lock); | |
70 | ||
71 | list_for_each_entry(chip, &pwm_chips, list) { | |
72 | const char *chip_name = dev_name(chip->dev); | |
73 | ||
74 | if (chip_name && strcmp(chip_name, name) == 0) { | |
75 | mutex_unlock(&pwm_lock); | |
76 | return chip; | |
77 | } | |
78 | } | |
79 | ||
80 | mutex_unlock(&pwm_lock); | |
81 | ||
82 | return NULL; | |
83 | } | |
84 | ||
f051c466 TR |
85 | static int pwm_device_request(struct pwm_device *pwm, const char *label) |
86 | { | |
87 | int err; | |
88 | ||
89 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) | |
90 | return -EBUSY; | |
91 | ||
92 | if (!try_module_get(pwm->chip->ops->owner)) | |
93 | return -ENODEV; | |
94 | ||
95 | if (pwm->chip->ops->request) { | |
96 | err = pwm->chip->ops->request(pwm->chip, pwm); | |
97 | if (err) { | |
98 | module_put(pwm->chip->ops->owner); | |
99 | return err; | |
100 | } | |
101 | } | |
102 | ||
1188829a | 103 | if (pwm->chip->ops->get_state) { |
1271a7b9 UKK |
104 | /* |
105 | * Zero-initialize state because most drivers are unaware of | |
106 | * .usage_power. The other members of state are supposed to be | |
107 | * set by lowlevel drivers. We still initialize the whole | |
108 | * structure for simplicity even though this might paper over | |
109 | * faulty implementations of .get_state(). | |
110 | */ | |
111 | struct pwm_state state = { 0, }; | |
c73a3107 UKK |
112 | |
113 | err = pwm->chip->ops->get_state(pwm->chip, pwm, &state); | |
114 | trace_pwm_get(pwm, &state, err); | |
115 | ||
116 | if (!err) | |
117 | pwm->state = state; | |
3ad1f3a3 | 118 | |
f5641d05 | 119 | if (IS_ENABLED(CONFIG_PWM_DEBUG)) |
3ad1f3a3 | 120 | pwm->last = pwm->state; |
1188829a | 121 | } |
cfc4c189 | 122 | |
f051c466 TR |
123 | set_bit(PWMF_REQUESTED, &pwm->flags); |
124 | pwm->label = label; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
83af2402 PA |
129 | struct pwm_device * |
130 | of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) | |
131 | { | |
132 | struct pwm_device *pwm; | |
133 | ||
cf38c978 | 134 | if (pc->of_pwm_n_cells < 2) |
83af2402 PA |
135 | return ERR_PTR(-EINVAL); |
136 | ||
42883cbc LW |
137 | /* flags in the third cell are optional */ |
138 | if (args->args_count < 2) | |
139 | return ERR_PTR(-EINVAL); | |
140 | ||
83af2402 PA |
141 | if (args->args[0] >= pc->npwm) |
142 | return ERR_PTR(-EINVAL); | |
143 | ||
144 | pwm = pwm_request_from_chip(pc, args->args[0], NULL); | |
145 | if (IS_ERR(pwm)) | |
146 | return pwm; | |
147 | ||
e39c0df1 | 148 | pwm->args.period = args->args[1]; |
42883cbc | 149 | pwm->args.polarity = PWM_POLARITY_NORMAL; |
83af2402 | 150 | |
cf38c978 UKK |
151 | if (pc->of_pwm_n_cells >= 3) { |
152 | if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED) | |
153 | pwm->args.polarity = PWM_POLARITY_INVERSED; | |
154 | } | |
83af2402 PA |
155 | |
156 | return pwm; | |
157 | } | |
417328c3 | 158 | EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags); |
83af2402 | 159 | |
3ab7b6ac BA |
160 | struct pwm_device * |
161 | of_pwm_single_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) | |
162 | { | |
163 | struct pwm_device *pwm; | |
164 | ||
165 | if (pc->of_pwm_n_cells < 1) | |
166 | return ERR_PTR(-EINVAL); | |
167 | ||
168 | /* validate that one cell is specified, optionally with flags */ | |
169 | if (args->args_count != 1 && args->args_count != 2) | |
170 | return ERR_PTR(-EINVAL); | |
171 | ||
172 | pwm = pwm_request_from_chip(pc, 0, NULL); | |
173 | if (IS_ERR(pwm)) | |
174 | return pwm; | |
175 | ||
176 | pwm->args.period = args->args[0]; | |
177 | pwm->args.polarity = PWM_POLARITY_NORMAL; | |
178 | ||
179 | if (args->args_count == 2 && args->args[2] & PWM_POLARITY_INVERTED) | |
180 | pwm->args.polarity = PWM_POLARITY_INVERSED; | |
181 | ||
182 | return pwm; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(of_pwm_single_xlate); | |
185 | ||
dfeb86ec | 186 | static void of_pwmchip_add(struct pwm_chip *chip) |
7299ab70 TR |
187 | { |
188 | if (!chip->dev || !chip->dev->of_node) | |
189 | return; | |
190 | ||
191 | if (!chip->of_xlate) { | |
69230cfa UKK |
192 | u32 pwm_cells; |
193 | ||
194 | if (of_property_read_u32(chip->dev->of_node, "#pwm-cells", | |
195 | &pwm_cells)) | |
196 | pwm_cells = 2; | |
197 | ||
5447e783 | 198 | chip->of_xlate = of_pwm_xlate_with_flags; |
69230cfa | 199 | chip->of_pwm_n_cells = pwm_cells; |
7299ab70 TR |
200 | } |
201 | ||
202 | of_node_get(chip->dev->of_node); | |
203 | } | |
204 | ||
dfeb86ec | 205 | static void of_pwmchip_remove(struct pwm_chip *chip) |
7299ab70 | 206 | { |
8d6cc073 | 207 | if (chip->dev) |
7299ab70 TR |
208 | of_node_put(chip->dev->of_node); |
209 | } | |
210 | ||
f051c466 TR |
211 | /** |
212 | * pwm_set_chip_data() - set private chip data for a PWM | |
213 | * @pwm: PWM device | |
214 | * @data: pointer to chip-specific data | |
04883802 TR |
215 | * |
216 | * Returns: 0 on success or a negative error code on failure. | |
f051c466 TR |
217 | */ |
218 | int pwm_set_chip_data(struct pwm_device *pwm, void *data) | |
219 | { | |
220 | if (!pwm) | |
221 | return -EINVAL; | |
222 | ||
223 | pwm->chip_data = data; | |
224 | ||
225 | return 0; | |
226 | } | |
928c4477 | 227 | EXPORT_SYMBOL_GPL(pwm_set_chip_data); |
f051c466 TR |
228 | |
229 | /** | |
230 | * pwm_get_chip_data() - get private chip data for a PWM | |
231 | * @pwm: PWM device | |
04883802 TR |
232 | * |
233 | * Returns: A pointer to the chip-private data for the PWM device. | |
f051c466 TR |
234 | */ |
235 | void *pwm_get_chip_data(struct pwm_device *pwm) | |
236 | { | |
237 | return pwm ? pwm->chip_data : NULL; | |
0c2498f1 | 238 | } |
928c4477 | 239 | EXPORT_SYMBOL_GPL(pwm_get_chip_data); |
0c2498f1 | 240 | |
3ad1f3a3 | 241 | static bool pwm_ops_check(const struct pwm_chip *chip) |
5ec803ed | 242 | { |
3ad1f3a3 UKK |
243 | const struct pwm_ops *ops = chip->ops; |
244 | ||
3ad1f3a3 UKK |
245 | if (!ops->apply) |
246 | return false; | |
247 | ||
248 | if (IS_ENABLED(CONFIG_PWM_DEBUG) && !ops->get_state) | |
249 | dev_warn(chip->dev, | |
250 | "Please implement the .get_state() callback\n"); | |
5ec803ed | 251 | |
3ad1f3a3 | 252 | return true; |
5ec803ed BB |
253 | } |
254 | ||
0c2498f1 | 255 | /** |
9666cec3 | 256 | * pwmchip_add() - register a new PWM chip |
0c2498f1 | 257 | * @chip: the PWM chip to add |
f051c466 | 258 | * |
9666cec3 | 259 | * Register a new PWM chip. |
04883802 TR |
260 | * |
261 | * Returns: 0 on success or a negative error code on failure. | |
0c2498f1 | 262 | */ |
9666cec3 | 263 | int pwmchip_add(struct pwm_chip *chip) |
0c2498f1 SH |
264 | { |
265 | struct pwm_device *pwm; | |
f051c466 TR |
266 | unsigned int i; |
267 | int ret; | |
0c2498f1 | 268 | |
5ec803ed BB |
269 | if (!chip || !chip->dev || !chip->ops || !chip->npwm) |
270 | return -EINVAL; | |
271 | ||
3ad1f3a3 | 272 | if (!pwm_ops_check(chip)) |
f051c466 | 273 | return -EINVAL; |
0c2498f1 | 274 | |
c8135b51 UKK |
275 | chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL); |
276 | if (!chip->pwms) | |
277 | return -ENOMEM; | |
278 | ||
0c2498f1 SH |
279 | mutex_lock(&pwm_lock); |
280 | ||
f9a8ee8c | 281 | ret = alloc_pwms(chip->npwm); |
c8135b51 UKK |
282 | if (ret < 0) { |
283 | mutex_unlock(&pwm_lock); | |
284 | kfree(chip->pwms); | |
285 | return ret; | |
286 | } | |
f051c466 | 287 | |
f9a8ee8c UKK |
288 | chip->base = ret; |
289 | ||
f051c466 TR |
290 | for (i = 0; i < chip->npwm; i++) { |
291 | pwm = &chip->pwms[i]; | |
292 | ||
293 | pwm->chip = chip; | |
294 | pwm->pwm = chip->base + i; | |
295 | pwm->hwpwm = i; | |
f051c466 TR |
296 | } |
297 | ||
f051c466 | 298 | list_add(&chip->list, &pwm_chips); |
0c2498f1 | 299 | |
c8135b51 | 300 | mutex_unlock(&pwm_lock); |
f051c466 | 301 | |
7299ab70 TR |
302 | if (IS_ENABLED(CONFIG_OF)) |
303 | of_pwmchip_add(chip); | |
304 | ||
c8135b51 | 305 | pwmchip_sysfs_export(chip); |
347ab948 | 306 | |
c8135b51 | 307 | return 0; |
0c2498f1 SH |
308 | } |
309 | EXPORT_SYMBOL_GPL(pwmchip_add); | |
310 | ||
311 | /** | |
312 | * pwmchip_remove() - remove a PWM chip | |
313 | * @chip: the PWM chip to remove | |
314 | * | |
315 | * Removes a PWM chip. This function may return busy if the PWM chip provides | |
316 | * a PWM device that is still requested. | |
04883802 TR |
317 | * |
318 | * Returns: 0 on success or a negative error code on failure. | |
0c2498f1 | 319 | */ |
8083f58d | 320 | void pwmchip_remove(struct pwm_chip *chip) |
0c2498f1 | 321 | { |
347ab948 | 322 | pwmchip_sysfs_unexport(chip); |
0733424c | 323 | |
0c2498f1 SH |
324 | mutex_lock(&pwm_lock); |
325 | ||
f051c466 | 326 | list_del_init(&chip->list); |
7299ab70 TR |
327 | |
328 | if (IS_ENABLED(CONFIG_OF)) | |
329 | of_pwmchip_remove(chip); | |
330 | ||
f051c466 | 331 | free_pwms(chip); |
0c2498f1 | 332 | |
0c2498f1 | 333 | mutex_unlock(&pwm_lock); |
0c2498f1 SH |
334 | } |
335 | EXPORT_SYMBOL_GPL(pwmchip_remove); | |
336 | ||
bcda91bf UKK |
337 | static void devm_pwmchip_remove(void *data) |
338 | { | |
339 | struct pwm_chip *chip = data; | |
340 | ||
341 | pwmchip_remove(chip); | |
342 | } | |
343 | ||
344 | int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip) | |
345 | { | |
346 | int ret; | |
347 | ||
348 | ret = pwmchip_add(chip); | |
349 | if (ret) | |
350 | return ret; | |
351 | ||
352 | return devm_add_action_or_reset(dev, devm_pwmchip_remove, chip); | |
353 | } | |
354 | EXPORT_SYMBOL_GPL(devm_pwmchip_add); | |
355 | ||
f051c466 TR |
356 | /** |
357 | * pwm_request_from_chip() - request a PWM device relative to a PWM chip | |
358 | * @chip: PWM chip | |
359 | * @index: per-chip index of the PWM to request | |
360 | * @label: a literal description string of this PWM | |
361 | * | |
04883802 TR |
362 | * Returns: A pointer to the PWM device at the given index of the given PWM |
363 | * chip. A negative error code is returned if the index is not valid for the | |
364 | * specified PWM chip or if the PWM device cannot be requested. | |
f051c466 TR |
365 | */ |
366 | struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, | |
367 | unsigned int index, | |
368 | const char *label) | |
369 | { | |
370 | struct pwm_device *pwm; | |
371 | int err; | |
0c2498f1 | 372 | |
f051c466 TR |
373 | if (!chip || index >= chip->npwm) |
374 | return ERR_PTR(-EINVAL); | |
0c2498f1 | 375 | |
f051c466 TR |
376 | mutex_lock(&pwm_lock); |
377 | pwm = &chip->pwms[index]; | |
0c2498f1 | 378 | |
f051c466 TR |
379 | err = pwm_device_request(pwm, label); |
380 | if (err < 0) | |
381 | pwm = ERR_PTR(err); | |
382 | ||
383 | mutex_unlock(&pwm_lock); | |
0c2498f1 SH |
384 | return pwm; |
385 | } | |
f051c466 | 386 | EXPORT_SYMBOL_GPL(pwm_request_from_chip); |
0c2498f1 | 387 | |
374c1104 JY |
388 | static void pwm_apply_state_debug(struct pwm_device *pwm, |
389 | const struct pwm_state *state) | |
3ad1f3a3 UKK |
390 | { |
391 | struct pwm_state *last = &pwm->last; | |
392 | struct pwm_chip *chip = pwm->chip; | |
1271a7b9 | 393 | struct pwm_state s1 = { 0 }, s2 = { 0 }; |
3ad1f3a3 UKK |
394 | int err; |
395 | ||
396 | if (!IS_ENABLED(CONFIG_PWM_DEBUG)) | |
397 | return; | |
398 | ||
399 | /* No reasonable diagnosis possible without .get_state() */ | |
400 | if (!chip->ops->get_state) | |
401 | return; | |
402 | ||
403 | /* | |
404 | * *state was just applied. Read out the hardware state and do some | |
405 | * checks. | |
406 | */ | |
407 | ||
3dae106f UKK |
408 | err = chip->ops->get_state(chip, pwm, &s1); |
409 | trace_pwm_get(pwm, &s1, err); | |
c73a3107 UKK |
410 | if (err) |
411 | /* If that failed there isn't much to debug */ | |
412 | return; | |
3ad1f3a3 UKK |
413 | |
414 | /* | |
415 | * The lowlevel driver either ignored .polarity (which is a bug) or as | |
416 | * best effort inverted .polarity and fixed .duty_cycle respectively. | |
417 | * Undo this inversion and fixup for further tests. | |
418 | */ | |
419 | if (s1.enabled && s1.polarity != state->polarity) { | |
420 | s2.polarity = state->polarity; | |
421 | s2.duty_cycle = s1.period - s1.duty_cycle; | |
422 | s2.period = s1.period; | |
423 | s2.enabled = s1.enabled; | |
424 | } else { | |
425 | s2 = s1; | |
426 | } | |
427 | ||
428 | if (s2.polarity != state->polarity && | |
429 | state->duty_cycle < state->period) | |
430 | dev_warn(chip->dev, ".apply ignored .polarity\n"); | |
431 | ||
432 | if (state->enabled && | |
433 | last->polarity == state->polarity && | |
434 | last->period > s2.period && | |
435 | last->period <= state->period) | |
436 | dev_warn(chip->dev, | |
a9d887dc | 437 | ".apply didn't pick the best available period (requested: %llu, applied: %llu, possible: %llu)\n", |
3ad1f3a3 UKK |
438 | state->period, s2.period, last->period); |
439 | ||
440 | if (state->enabled && state->period < s2.period) | |
441 | dev_warn(chip->dev, | |
a9d887dc | 442 | ".apply is supposed to round down period (requested: %llu, applied: %llu)\n", |
3ad1f3a3 UKK |
443 | state->period, s2.period); |
444 | ||
445 | if (state->enabled && | |
446 | last->polarity == state->polarity && | |
447 | last->period == s2.period && | |
448 | last->duty_cycle > s2.duty_cycle && | |
449 | last->duty_cycle <= state->duty_cycle) | |
450 | dev_warn(chip->dev, | |
a9d887dc | 451 | ".apply didn't pick the best available duty cycle (requested: %llu/%llu, applied: %llu/%llu, possible: %llu/%llu)\n", |
3ad1f3a3 UKK |
452 | state->duty_cycle, state->period, |
453 | s2.duty_cycle, s2.period, | |
454 | last->duty_cycle, last->period); | |
455 | ||
456 | if (state->enabled && state->duty_cycle < s2.duty_cycle) | |
457 | dev_warn(chip->dev, | |
a9d887dc | 458 | ".apply is supposed to round down duty_cycle (requested: %llu/%llu, applied: %llu/%llu)\n", |
3ad1f3a3 UKK |
459 | state->duty_cycle, state->period, |
460 | s2.duty_cycle, s2.period); | |
461 | ||
462 | if (!state->enabled && s2.enabled && s2.duty_cycle > 0) | |
463 | dev_warn(chip->dev, | |
db539cb9 | 464 | "requested disabled, but yielded enabled with duty > 0\n"); |
3ad1f3a3 UKK |
465 | |
466 | /* reapply the state that the driver reported being configured. */ | |
467 | err = chip->ops->apply(chip, pwm, &s1); | |
3dae106f | 468 | trace_pwm_apply(pwm, &s1, err); |
3ad1f3a3 UKK |
469 | if (err) { |
470 | *last = s1; | |
471 | dev_err(chip->dev, "failed to reapply current setting\n"); | |
472 | return; | |
473 | } | |
474 | ||
1271a7b9 | 475 | *last = (struct pwm_state){ 0 }; |
3dae106f UKK |
476 | err = chip->ops->get_state(chip, pwm, last); |
477 | trace_pwm_get(pwm, last, err); | |
c73a3107 UKK |
478 | if (err) |
479 | return; | |
3ad1f3a3 UKK |
480 | |
481 | /* reapplication of the current state should give an exact match */ | |
482 | if (s1.enabled != last->enabled || | |
483 | s1.polarity != last->polarity || | |
484 | (s1.enabled && s1.period != last->period) || | |
485 | (s1.enabled && s1.duty_cycle != last->duty_cycle)) { | |
486 | dev_err(chip->dev, | |
a9d887dc | 487 | ".apply is not idempotent (ena=%d pol=%d %llu/%llu) -> (ena=%d pol=%d %llu/%llu)\n", |
3ad1f3a3 UKK |
488 | s1.enabled, s1.polarity, s1.duty_cycle, s1.period, |
489 | last->enabled, last->polarity, last->duty_cycle, | |
490 | last->period); | |
491 | } | |
492 | } | |
493 | ||
0c2498f1 | 494 | /** |
5ec803ed | 495 | * pwm_apply_state() - atomically apply a new state to a PWM device |
0c2498f1 | 496 | * @pwm: PWM device |
71523d18 | 497 | * @state: new state to apply |
0c2498f1 | 498 | */ |
71523d18 | 499 | int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) |
0c2498f1 | 500 | { |
fc3c5512 | 501 | struct pwm_chip *chip; |
76abbdde HS |
502 | int err; |
503 | ||
4ad91a22 UKK |
504 | /* |
505 | * Some lowlevel driver's implementations of .apply() make use of | |
506 | * mutexes, also with some drivers only returning when the new | |
507 | * configuration is active calling pwm_apply_state() from atomic context | |
508 | * is a bad idea. So make it explicit that calling this function might | |
509 | * sleep. | |
510 | */ | |
511 | might_sleep(); | |
512 | ||
ef2bf499 BN |
513 | if (!pwm || !state || !state->period || |
514 | state->duty_cycle > state->period) | |
f051c466 TR |
515 | return -EINVAL; |
516 | ||
fc3c5512 UKK |
517 | chip = pwm->chip; |
518 | ||
309b32fb UKK |
519 | if (state->period == pwm->state.period && |
520 | state->duty_cycle == pwm->state.duty_cycle && | |
521 | state->polarity == pwm->state.polarity && | |
9e40ee18 CG |
522 | state->enabled == pwm->state.enabled && |
523 | state->usage_power == pwm->state.usage_power) | |
5ec803ed | 524 | return 0; |
76abbdde | 525 | |
0829c35d | 526 | err = chip->ops->apply(chip, pwm, state); |
3dae106f | 527 | trace_pwm_apply(pwm, state, err); |
77965c98 UKK |
528 | if (err) |
529 | return err; | |
5ec803ed | 530 | |
77965c98 | 531 | pwm->state = *state; |
5ec803ed | 532 | |
77965c98 UKK |
533 | /* |
534 | * only do this after pwm->state was applied as some | |
535 | * implementations of .get_state depend on this | |
536 | */ | |
537 | pwm_apply_state_debug(pwm, state); | |
0aa0869c | 538 | |
459a25af | 539 | return 0; |
0aa0869c | 540 | } |
5ec803ed | 541 | EXPORT_SYMBOL_GPL(pwm_apply_state); |
0aa0869c | 542 | |
3a3d1a4e LJ |
543 | /** |
544 | * pwm_capture() - capture and report a PWM signal | |
545 | * @pwm: PWM device | |
546 | * @result: structure to fill with capture result | |
547 | * @timeout: time to wait, in milliseconds, before giving up on capture | |
548 | * | |
549 | * Returns: 0 on success or a negative error code on failure. | |
550 | */ | |
551 | int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, | |
552 | unsigned long timeout) | |
553 | { | |
554 | int err; | |
555 | ||
556 | if (!pwm || !pwm->chip->ops) | |
557 | return -EINVAL; | |
558 | ||
559 | if (!pwm->chip->ops->capture) | |
560 | return -ENOSYS; | |
561 | ||
562 | mutex_lock(&pwm_lock); | |
563 | err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout); | |
564 | mutex_unlock(&pwm_lock); | |
565 | ||
566 | return err; | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(pwm_capture); | |
569 | ||
0c2498f1 | 570 | /** |
5ec803ed | 571 | * pwm_adjust_config() - adjust the current PWM config to the PWM arguments |
0c2498f1 | 572 | * @pwm: PWM device |
04883802 | 573 | * |
5ec803ed BB |
574 | * This function will adjust the PWM config to the PWM arguments provided |
575 | * by the DT or PWM lookup table. This is particularly useful to adapt | |
576 | * the bootloader config to the Linux one. | |
0c2498f1 | 577 | */ |
5ec803ed | 578 | int pwm_adjust_config(struct pwm_device *pwm) |
0c2498f1 | 579 | { |
5ec803ed BB |
580 | struct pwm_state state; |
581 | struct pwm_args pargs; | |
d1cd2142 | 582 | |
5ec803ed BB |
583 | pwm_get_args(pwm, &pargs); |
584 | pwm_get_state(pwm, &state); | |
d1cd2142 | 585 | |
5ec803ed BB |
586 | /* |
587 | * If the current period is zero it means that either the PWM driver | |
588 | * does not support initial state retrieval or the PWM has not yet | |
589 | * been configured. | |
590 | * | |
591 | * In either case, we setup the new period and polarity, and assign a | |
592 | * duty cycle of 0. | |
593 | */ | |
594 | if (!state.period) { | |
595 | state.duty_cycle = 0; | |
596 | state.period = pargs.period; | |
597 | state.polarity = pargs.polarity; | |
d1cd2142 | 598 | |
5ec803ed | 599 | return pwm_apply_state(pwm, &state); |
d1cd2142 JR |
600 | } |
601 | ||
5ec803ed BB |
602 | /* |
603 | * Adjust the PWM duty cycle/period based on the period value provided | |
604 | * in PWM args. | |
605 | */ | |
606 | if (pargs.period != state.period) { | |
607 | u64 dutycycle = (u64)state.duty_cycle * pargs.period; | |
0c2498f1 | 608 | |
5ec803ed BB |
609 | do_div(dutycycle, state.period); |
610 | state.duty_cycle = dutycycle; | |
611 | state.period = pargs.period; | |
612 | } | |
0c2498f1 | 613 | |
5ec803ed BB |
614 | /* |
615 | * If the polarity changed, we should also change the duty cycle. | |
616 | */ | |
617 | if (pargs.polarity != state.polarity) { | |
618 | state.polarity = pargs.polarity; | |
619 | state.duty_cycle = state.period - state.duty_cycle; | |
09a7e4a3 | 620 | } |
5ec803ed BB |
621 | |
622 | return pwm_apply_state(pwm, &state); | |
0c2498f1 | 623 | } |
5ec803ed | 624 | EXPORT_SYMBOL_GPL(pwm_adjust_config); |
62099abf | 625 | |
ca06616b | 626 | static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode) |
7299ab70 TR |
627 | { |
628 | struct pwm_chip *chip; | |
629 | ||
630 | mutex_lock(&pwm_lock); | |
631 | ||
632 | list_for_each_entry(chip, &pwm_chips, list) | |
b4319802 | 633 | if (chip->dev && device_match_fwnode(chip->dev, fwnode)) { |
7299ab70 TR |
634 | mutex_unlock(&pwm_lock); |
635 | return chip; | |
636 | } | |
637 | ||
638 | mutex_unlock(&pwm_lock); | |
639 | ||
640 | return ERR_PTR(-EPROBE_DEFER); | |
641 | } | |
642 | ||
b2c200e3 FG |
643 | static struct device_link *pwm_device_link_add(struct device *dev, |
644 | struct pwm_device *pwm) | |
645 | { | |
646 | struct device_link *dl; | |
647 | ||
648 | if (!dev) { | |
649 | /* | |
650 | * No device for the PWM consumer has been provided. It may | |
651 | * impact the PM sequence ordering: the PWM supplier may get | |
652 | * suspended before the consumer. | |
653 | */ | |
654 | dev_warn(pwm->chip->dev, | |
655 | "No consumer device specified to create a link to\n"); | |
656 | return NULL; | |
657 | } | |
658 | ||
659 | dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER); | |
660 | if (!dl) { | |
661 | dev_err(dev, "failed to create device link to %s\n", | |
662 | dev_name(pwm->chip->dev)); | |
663 | return ERR_PTR(-EINVAL); | |
664 | } | |
665 | ||
666 | return dl; | |
667 | } | |
668 | ||
7299ab70 | 669 | /** |
8eb96127 | 670 | * of_pwm_get() - request a PWM via the PWM framework |
b2c200e3 | 671 | * @dev: device for PWM consumer |
7299ab70 TR |
672 | * @np: device node to get the PWM from |
673 | * @con_id: consumer name | |
674 | * | |
675 | * Returns the PWM device parsed from the phandle and index specified in the | |
676 | * "pwms" property of a device tree node or a negative error-code on failure. | |
677 | * Values parsed from the device tree are stored in the returned PWM device | |
678 | * object. | |
679 | * | |
680 | * If con_id is NULL, the first PWM device listed in the "pwms" property will | |
681 | * be requested. Otherwise the "pwm-names" property is used to do a reverse | |
682 | * lookup of the PWM index. This also means that the "pwm-names" property | |
683 | * becomes mandatory for devices that look up the PWM device via the con_id | |
684 | * parameter. | |
04883802 TR |
685 | * |
686 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
687 | * error code on failure. | |
7299ab70 | 688 | */ |
b5ae0ad5 AS |
689 | static struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np, |
690 | const char *con_id) | |
7299ab70 TR |
691 | { |
692 | struct pwm_device *pwm = NULL; | |
693 | struct of_phandle_args args; | |
b2c200e3 | 694 | struct device_link *dl; |
7299ab70 TR |
695 | struct pwm_chip *pc; |
696 | int index = 0; | |
697 | int err; | |
698 | ||
699 | if (con_id) { | |
700 | index = of_property_match_string(np, "pwm-names", con_id); | |
701 | if (index < 0) | |
702 | return ERR_PTR(index); | |
703 | } | |
704 | ||
705 | err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index, | |
706 | &args); | |
707 | if (err) { | |
f2dafc09 | 708 | pr_err("%s(): can't parse \"pwms\" property\n", __func__); |
7299ab70 TR |
709 | return ERR_PTR(err); |
710 | } | |
711 | ||
ca06616b | 712 | pc = fwnode_to_pwmchip(of_fwnode_handle(args.np)); |
7299ab70 | 713 | if (IS_ERR(pc)) { |
93c292ef JB |
714 | if (PTR_ERR(pc) != -EPROBE_DEFER) |
715 | pr_err("%s(): PWM chip not found\n", __func__); | |
716 | ||
7299ab70 TR |
717 | pwm = ERR_CAST(pc); |
718 | goto put; | |
719 | } | |
720 | ||
7299ab70 TR |
721 | pwm = pc->of_xlate(pc, &args); |
722 | if (IS_ERR(pwm)) | |
723 | goto put; | |
724 | ||
b2c200e3 FG |
725 | dl = pwm_device_link_add(dev, pwm); |
726 | if (IS_ERR(dl)) { | |
727 | /* of_xlate ended up calling pwm_request_from_chip() */ | |
0af4d704 | 728 | pwm_put(pwm); |
b2c200e3 FG |
729 | pwm = ERR_CAST(dl); |
730 | goto put; | |
731 | } | |
732 | ||
7299ab70 TR |
733 | /* |
734 | * If a consumer name was not given, try to look it up from the | |
735 | * "pwm-names" property if it exists. Otherwise use the name of | |
736 | * the user device node. | |
737 | */ | |
738 | if (!con_id) { | |
739 | err = of_property_read_string_index(np, "pwm-names", index, | |
740 | &con_id); | |
741 | if (err < 0) | |
742 | con_id = np->name; | |
743 | } | |
744 | ||
745 | pwm->label = con_id; | |
746 | ||
747 | put: | |
748 | of_node_put(args.np); | |
749 | ||
750 | return pwm; | |
751 | } | |
752 | ||
4a6ef8e3 NV |
753 | /** |
754 | * acpi_pwm_get() - request a PWM via parsing "pwms" property in ACPI | |
e625fb70 | 755 | * @fwnode: firmware node to get the "pwms" property from |
4a6ef8e3 NV |
756 | * |
757 | * Returns the PWM device parsed from the fwnode and index specified in the | |
758 | * "pwms" property or a negative error-code on failure. | |
759 | * Values parsed from the device tree are stored in the returned PWM device | |
760 | * object. | |
761 | * | |
762 | * This is analogous to of_pwm_get() except con_id is not yet supported. | |
763 | * ACPI entries must look like | |
764 | * Package () {"pwms", Package () | |
765 | * { <PWM device reference>, <PWM index>, <PWM period> [, <PWM flags>]}} | |
766 | * | |
767 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
768 | * error code on failure. | |
769 | */ | |
e625fb70 | 770 | static struct pwm_device *acpi_pwm_get(const struct fwnode_handle *fwnode) |
4a6ef8e3 | 771 | { |
bebedf2b | 772 | struct pwm_device *pwm; |
4a6ef8e3 | 773 | struct fwnode_reference_args args; |
4a6ef8e3 NV |
774 | struct pwm_chip *chip; |
775 | int ret; | |
776 | ||
777 | memset(&args, 0, sizeof(args)); | |
778 | ||
779 | ret = __acpi_node_get_property_reference(fwnode, "pwms", 0, 3, &args); | |
780 | if (ret < 0) | |
781 | return ERR_PTR(ret); | |
782 | ||
4a6ef8e3 NV |
783 | if (args.nargs < 2) |
784 | return ERR_PTR(-EPROTO); | |
785 | ||
e5c38ba9 | 786 | chip = fwnode_to_pwmchip(args.fwnode); |
4a6ef8e3 NV |
787 | if (IS_ERR(chip)) |
788 | return ERR_CAST(chip); | |
789 | ||
790 | pwm = pwm_request_from_chip(chip, args.args[0], NULL); | |
791 | if (IS_ERR(pwm)) | |
792 | return pwm; | |
793 | ||
794 | pwm->args.period = args.args[1]; | |
795 | pwm->args.polarity = PWM_POLARITY_NORMAL; | |
796 | ||
797 | if (args.nargs > 2 && args.args[2] & PWM_POLARITY_INVERTED) | |
798 | pwm->args.polarity = PWM_POLARITY_INVERSED; | |
4a6ef8e3 NV |
799 | |
800 | return pwm; | |
801 | } | |
802 | ||
8138d2dd TR |
803 | /** |
804 | * pwm_add_table() - register PWM device consumers | |
805 | * @table: array of consumers to register | |
806 | * @num: number of consumers in table | |
807 | */ | |
c264f111 | 808 | void pwm_add_table(struct pwm_lookup *table, size_t num) |
8138d2dd TR |
809 | { |
810 | mutex_lock(&pwm_lookup_lock); | |
811 | ||
812 | while (num--) { | |
813 | list_add_tail(&table->list, &pwm_lookup_list); | |
814 | table++; | |
815 | } | |
816 | ||
817 | mutex_unlock(&pwm_lookup_lock); | |
818 | } | |
819 | ||
efb0de55 SK |
820 | /** |
821 | * pwm_remove_table() - unregister PWM device consumers | |
822 | * @table: array of consumers to unregister | |
823 | * @num: number of consumers in table | |
824 | */ | |
825 | void pwm_remove_table(struct pwm_lookup *table, size_t num) | |
826 | { | |
827 | mutex_lock(&pwm_lookup_lock); | |
828 | ||
829 | while (num--) { | |
830 | list_del(&table->list); | |
831 | table++; | |
832 | } | |
833 | ||
834 | mutex_unlock(&pwm_lookup_lock); | |
835 | } | |
836 | ||
8138d2dd TR |
837 | /** |
838 | * pwm_get() - look up and request a PWM device | |
839 | * @dev: device for PWM consumer | |
840 | * @con_id: consumer name | |
841 | * | |
7299ab70 TR |
842 | * Lookup is first attempted using DT. If the device was not instantiated from |
843 | * a device tree, a PWM chip and a relative index is looked up via a table | |
844 | * supplied by board setup code (see pwm_add_table()). | |
8138d2dd TR |
845 | * |
846 | * Once a PWM chip has been found the specified PWM device will be requested | |
847 | * and is ready to be used. | |
04883802 TR |
848 | * |
849 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
850 | * error code on failure. | |
8138d2dd TR |
851 | */ |
852 | struct pwm_device *pwm_get(struct device *dev, const char *con_id) | |
853 | { | |
e625fb70 | 854 | const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; |
e50d3523 | 855 | const char *dev_id = dev ? dev_name(dev) : NULL; |
69efb343 HG |
856 | struct pwm_device *pwm; |
857 | struct pwm_chip *chip; | |
b2c200e3 | 858 | struct device_link *dl; |
8138d2dd | 859 | unsigned int best = 0; |
70145f87 | 860 | struct pwm_lookup *p, *chosen = NULL; |
8138d2dd | 861 | unsigned int match; |
b526a314 | 862 | int err; |
8138d2dd | 863 | |
7299ab70 | 864 | /* look up via DT first */ |
e625fb70 AS |
865 | if (is_of_node(fwnode)) |
866 | return of_pwm_get(dev, to_of_node(fwnode), con_id); | |
7299ab70 | 867 | |
4a6ef8e3 | 868 | /* then lookup via ACPI */ |
e625fb70 AS |
869 | if (is_acpi_node(fwnode)) { |
870 | pwm = acpi_pwm_get(fwnode); | |
6cf9481b HG |
871 | if (!IS_ERR(pwm) || PTR_ERR(pwm) != -ENOENT) |
872 | return pwm; | |
873 | } | |
7299ab70 | 874 | |
8138d2dd TR |
875 | /* |
876 | * We look up the provider in the static table typically provided by | |
877 | * board setup code. We first try to lookup the consumer device by | |
878 | * name. If the consumer device was passed in as NULL or if no match | |
879 | * was found, we try to find the consumer by directly looking it up | |
880 | * by name. | |
881 | * | |
882 | * If a match is found, the provider PWM chip is looked up by name | |
883 | * and a PWM device is requested using the PWM device per-chip index. | |
884 | * | |
885 | * The lookup algorithm was shamelessly taken from the clock | |
886 | * framework: | |
887 | * | |
888 | * We do slightly fuzzy matching here: | |
889 | * An entry with a NULL ID is assumed to be a wildcard. | |
890 | * If an entry has a device ID, it must match | |
891 | * If an entry has a connection ID, it must match | |
892 | * Then we take the most specific entry - with the following order | |
893 | * of precedence: dev+con > dev only > con only. | |
894 | */ | |
895 | mutex_lock(&pwm_lookup_lock); | |
896 | ||
897 | list_for_each_entry(p, &pwm_lookup_list, list) { | |
898 | match = 0; | |
899 | ||
900 | if (p->dev_id) { | |
901 | if (!dev_id || strcmp(p->dev_id, dev_id)) | |
902 | continue; | |
903 | ||
904 | match += 2; | |
905 | } | |
906 | ||
907 | if (p->con_id) { | |
908 | if (!con_id || strcmp(p->con_id, con_id)) | |
909 | continue; | |
910 | ||
911 | match += 1; | |
912 | } | |
913 | ||
914 | if (match > best) { | |
70145f87 | 915 | chosen = p; |
8138d2dd TR |
916 | |
917 | if (match != 3) | |
918 | best = match; | |
919 | else | |
920 | break; | |
921 | } | |
922 | } | |
923 | ||
69efb343 HG |
924 | mutex_unlock(&pwm_lookup_lock); |
925 | ||
926 | if (!chosen) | |
927 | return ERR_PTR(-ENODEV); | |
3796ce1d | 928 | |
70145f87 | 929 | chip = pwmchip_find_by_name(chosen->provider); |
b526a314 HG |
930 | |
931 | /* | |
932 | * If the lookup entry specifies a module, load the module and retry | |
933 | * the PWM chip lookup. This can be used to work around driver load | |
934 | * ordering issues if driver's can't be made to properly support the | |
935 | * deferred probe mechanism. | |
936 | */ | |
937 | if (!chip && chosen->module) { | |
938 | err = request_module(chosen->module); | |
939 | if (err == 0) | |
940 | chip = pwmchip_find_by_name(chosen->provider); | |
941 | } | |
942 | ||
70145f87 | 943 | if (!chip) |
69efb343 | 944 | return ERR_PTR(-EPROBE_DEFER); |
3796ce1d | 945 | |
70145f87 GU |
946 | pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id); |
947 | if (IS_ERR(pwm)) | |
69efb343 | 948 | return pwm; |
8138d2dd | 949 | |
b2c200e3 FG |
950 | dl = pwm_device_link_add(dev, pwm); |
951 | if (IS_ERR(dl)) { | |
0af4d704 | 952 | pwm_put(pwm); |
b2c200e3 FG |
953 | return ERR_CAST(dl); |
954 | } | |
955 | ||
fbd45a12 BB |
956 | pwm->args.period = chosen->period; |
957 | pwm->args.polarity = chosen->polarity; | |
958 | ||
8138d2dd TR |
959 | return pwm; |
960 | } | |
961 | EXPORT_SYMBOL_GPL(pwm_get); | |
962 | ||
963 | /** | |
964 | * pwm_put() - release a PWM device | |
965 | * @pwm: PWM device | |
966 | */ | |
967 | void pwm_put(struct pwm_device *pwm) | |
968 | { | |
969 | if (!pwm) | |
970 | return; | |
971 | ||
972 | mutex_lock(&pwm_lock); | |
973 | ||
974 | if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) { | |
e50d3523 | 975 | pr_warn("PWM device already freed\n"); |
8138d2dd TR |
976 | goto out; |
977 | } | |
978 | ||
979 | if (pwm->chip->ops->free) | |
980 | pwm->chip->ops->free(pwm->chip, pwm); | |
981 | ||
e926b12c | 982 | pwm_set_chip_data(pwm, NULL); |
8138d2dd TR |
983 | pwm->label = NULL; |
984 | ||
985 | module_put(pwm->chip->ops->owner); | |
986 | out: | |
987 | mutex_unlock(&pwm_lock); | |
988 | } | |
989 | EXPORT_SYMBOL_GPL(pwm_put); | |
990 | ||
9ae241d0 | 991 | static void devm_pwm_release(void *pwm) |
6354316d | 992 | { |
9ae241d0 | 993 | pwm_put(pwm); |
6354316d AC |
994 | } |
995 | ||
996 | /** | |
997 | * devm_pwm_get() - resource managed pwm_get() | |
998 | * @dev: device for PWM consumer | |
999 | * @con_id: consumer name | |
1000 | * | |
1001 | * This function performs like pwm_get() but the acquired PWM device will | |
1002 | * automatically be released on driver detach. | |
04883802 TR |
1003 | * |
1004 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1005 | * error code on failure. | |
6354316d AC |
1006 | */ |
1007 | struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id) | |
1008 | { | |
9ae241d0 AS |
1009 | struct pwm_device *pwm; |
1010 | int ret; | |
6354316d AC |
1011 | |
1012 | pwm = pwm_get(dev, con_id); | |
9ae241d0 AS |
1013 | if (IS_ERR(pwm)) |
1014 | return pwm; | |
1015 | ||
1016 | ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm); | |
1017 | if (ret) | |
1018 | return ERR_PTR(ret); | |
6354316d AC |
1019 | |
1020 | return pwm; | |
1021 | } | |
1022 | EXPORT_SYMBOL_GPL(devm_pwm_get); | |
1023 | ||
4a6ef8e3 NV |
1024 | /** |
1025 | * devm_fwnode_pwm_get() - request a resource managed PWM from firmware node | |
1026 | * @dev: device for PWM consumer | |
1027 | * @fwnode: firmware node to get the PWM from | |
1028 | * @con_id: consumer name | |
1029 | * | |
1030 | * Returns the PWM device parsed from the firmware node. See of_pwm_get() and | |
1031 | * acpi_pwm_get() for a detailed description. | |
1032 | * | |
1033 | * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded | |
1034 | * error code on failure. | |
1035 | */ | |
1036 | struct pwm_device *devm_fwnode_pwm_get(struct device *dev, | |
1037 | struct fwnode_handle *fwnode, | |
1038 | const char *con_id) | |
1039 | { | |
9ae241d0 AS |
1040 | struct pwm_device *pwm = ERR_PTR(-ENODEV); |
1041 | int ret; | |
4a6ef8e3 NV |
1042 | |
1043 | if (is_of_node(fwnode)) | |
1044 | pwm = of_pwm_get(dev, to_of_node(fwnode), con_id); | |
1045 | else if (is_acpi_node(fwnode)) | |
1046 | pwm = acpi_pwm_get(fwnode); | |
9ae241d0 AS |
1047 | if (IS_ERR(pwm)) |
1048 | return pwm; | |
4a6ef8e3 | 1049 | |
9ae241d0 AS |
1050 | ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm); |
1051 | if (ret) | |
1052 | return ERR_PTR(ret); | |
4a6ef8e3 NV |
1053 | |
1054 | return pwm; | |
1055 | } | |
1056 | EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get); | |
1057 | ||
62099abf TR |
1058 | #ifdef CONFIG_DEBUG_FS |
1059 | static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s) | |
1060 | { | |
1061 | unsigned int i; | |
1062 | ||
1063 | for (i = 0; i < chip->npwm; i++) { | |
1064 | struct pwm_device *pwm = &chip->pwms[i]; | |
39100cee BB |
1065 | struct pwm_state state; |
1066 | ||
1067 | pwm_get_state(pwm, &state); | |
62099abf TR |
1068 | |
1069 | seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label); | |
1070 | ||
1071 | if (test_bit(PWMF_REQUESTED, &pwm->flags)) | |
adcba1e3 | 1072 | seq_puts(s, " requested"); |
62099abf | 1073 | |
39100cee | 1074 | if (state.enabled) |
adcba1e3 | 1075 | seq_puts(s, " enabled"); |
62099abf | 1076 | |
a9d887dc GDS |
1077 | seq_printf(s, " period: %llu ns", state.period); |
1078 | seq_printf(s, " duty: %llu ns", state.duty_cycle); | |
23e3523f HS |
1079 | seq_printf(s, " polarity: %s", |
1080 | state.polarity ? "inverse" : "normal"); | |
1081 | ||
9e40ee18 CG |
1082 | if (state.usage_power) |
1083 | seq_puts(s, " usage_power"); | |
1084 | ||
adcba1e3 | 1085 | seq_puts(s, "\n"); |
62099abf TR |
1086 | } |
1087 | } | |
1088 | ||
1089 | static void *pwm_seq_start(struct seq_file *s, loff_t *pos) | |
1090 | { | |
1091 | mutex_lock(&pwm_lock); | |
1092 | s->private = ""; | |
1093 | ||
1094 | return seq_list_start(&pwm_chips, *pos); | |
1095 | } | |
1096 | ||
1097 | static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1098 | { | |
1099 | s->private = "\n"; | |
1100 | ||
1101 | return seq_list_next(v, &pwm_chips, pos); | |
1102 | } | |
1103 | ||
1104 | static void pwm_seq_stop(struct seq_file *s, void *v) | |
1105 | { | |
1106 | mutex_unlock(&pwm_lock); | |
1107 | } | |
1108 | ||
1109 | static int pwm_seq_show(struct seq_file *s, void *v) | |
1110 | { | |
1111 | struct pwm_chip *chip = list_entry(v, struct pwm_chip, list); | |
1112 | ||
1113 | seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private, | |
1114 | chip->dev->bus ? chip->dev->bus->name : "no-bus", | |
1115 | dev_name(chip->dev), chip->npwm, | |
1116 | (chip->npwm != 1) ? "s" : ""); | |
1117 | ||
cc2d2247 | 1118 | pwm_dbg_show(chip, s); |
62099abf TR |
1119 | |
1120 | return 0; | |
1121 | } | |
1122 | ||
f339e79b | 1123 | static const struct seq_operations pwm_debugfs_sops = { |
62099abf TR |
1124 | .start = pwm_seq_start, |
1125 | .next = pwm_seq_next, | |
1126 | .stop = pwm_seq_stop, | |
1127 | .show = pwm_seq_show, | |
1128 | }; | |
1129 | ||
f339e79b | 1130 | DEFINE_SEQ_ATTRIBUTE(pwm_debugfs); |
62099abf TR |
1131 | |
1132 | static int __init pwm_debugfs_init(void) | |
1133 | { | |
55f363e1 | 1134 | debugfs_create_file("pwm", 0444, NULL, NULL, &pwm_debugfs_fops); |
62099abf TR |
1135 | |
1136 | return 0; | |
1137 | } | |
62099abf TR |
1138 | subsys_initcall(pwm_debugfs_init); |
1139 | #endif /* CONFIG_DEBUG_FS */ |