Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1a189b97 RK |
2 | #ifndef __LINUX_PWM_H |
3 | #define __LINUX_PWM_H | |
4 | ||
0bcf168b | 5 | #include <linux/err.h> |
d1cd2142 | 6 | #include <linux/mutex.h> |
7299ab70 TR |
7 | #include <linux/of.h> |
8 | ||
0c2498f1 SH |
9 | struct pwm_chip; |
10 | ||
0aa0869c PA |
11 | /** |
12 | * enum pwm_polarity - polarity of a PWM signal | |
13 | * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty- | |
14 | * cycle, followed by a low signal for the remainder of the pulse | |
15 | * period | |
16 | * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty- | |
17 | * cycle, followed by a high signal for the remainder of the pulse | |
18 | * period | |
19 | */ | |
20 | enum pwm_polarity { | |
21 | PWM_POLARITY_NORMAL, | |
22 | PWM_POLARITY_INVERSED, | |
23 | }; | |
24 | ||
e39c0df1 BB |
25 | /** |
26 | * struct pwm_args - board-dependent PWM arguments | |
27 | * @period: reference period | |
28 | * @polarity: reference polarity | |
29 | * | |
30 | * This structure describes board-dependent arguments attached to a PWM | |
31 | * device. These arguments are usually retrieved from the PWM lookup table or | |
32 | * device tree. | |
33 | * | |
34 | * Do not confuse this with the PWM state: PWM arguments represent the initial | |
35 | * configuration that users want to use on this PWM device rather than the | |
36 | * current PWM hardware state. | |
37 | */ | |
38 | struct pwm_args { | |
a9d887dc | 39 | u64 period; |
e39c0df1 BB |
40 | enum pwm_polarity polarity; |
41 | }; | |
42 | ||
f051c466 TR |
43 | enum { |
44 | PWMF_REQUESTED = 1 << 0, | |
09a7e4a3 | 45 | PWMF_EXPORTED = 1 << 1, |
f051c466 TR |
46 | }; |
47 | ||
43a276b0 BB |
48 | /* |
49 | * struct pwm_state - state of a PWM channel | |
50 | * @period: PWM period (in nanoseconds) | |
51 | * @duty_cycle: PWM duty cycle (in nanoseconds) | |
52 | * @polarity: PWM polarity | |
09a7e4a3 | 53 | * @enabled: PWM enabled status |
9e40ee18 CG |
54 | * @usage_power: If set, the PWM driver is only required to maintain the power |
55 | * output but has more freedom regarding signal form. | |
56 | * If supported, the signal can be optimized, for example to | |
57 | * improve EMI by phase shifting individual channels. | |
43a276b0 BB |
58 | */ |
59 | struct pwm_state { | |
a9d887dc GDS |
60 | u64 period; |
61 | u64 duty_cycle; | |
43a276b0 | 62 | enum pwm_polarity polarity; |
09a7e4a3 | 63 | bool enabled; |
9e40ee18 | 64 | bool usage_power; |
43a276b0 BB |
65 | }; |
66 | ||
04883802 TR |
67 | /** |
68 | * struct pwm_device - PWM channel object | |
69 | * @label: name of the PWM device | |
70 | * @flags: flags associated with the PWM device | |
71 | * @hwpwm: per-chip relative index of the PWM device | |
72 | * @pwm: global index of the PWM device | |
73 | * @chip: PWM chip providing this PWM device | |
74 | * @chip_data: chip-private data associated with the PWM device | |
e39c0df1 | 75 | * @args: PWM arguments |
3ad1f3a3 UKK |
76 | * @state: last applied state |
77 | * @last: last implemented state (for PWM_DEBUG) | |
04883802 | 78 | */ |
f051c466 | 79 | struct pwm_device { |
6bc7064a TR |
80 | const char *label; |
81 | unsigned long flags; | |
82 | unsigned int hwpwm; | |
83 | unsigned int pwm; | |
84 | struct pwm_chip *chip; | |
85 | void *chip_data; | |
86 | ||
e39c0df1 | 87 | struct pwm_args args; |
43a276b0 | 88 | struct pwm_state state; |
3ad1f3a3 | 89 | struct pwm_state last; |
f051c466 TR |
90 | }; |
91 | ||
43a276b0 BB |
92 | /** |
93 | * pwm_get_state() - retrieve the current PWM state | |
94 | * @pwm: PWM device | |
95 | * @state: state to fill with the current PWM state | |
1a7a6e80 UKK |
96 | * |
97 | * The returned PWM state represents the state that was applied by a previous call to | |
98 | * pwm_apply_state(). Drivers may have to slightly tweak that state before programming it to | |
99 | * hardware. If pwm_apply_state() was never called, this returns either the current hardware | |
100 | * state (if supported) or the default settings. | |
43a276b0 BB |
101 | */ |
102 | static inline void pwm_get_state(const struct pwm_device *pwm, | |
103 | struct pwm_state *state) | |
104 | { | |
105 | *state = pwm->state; | |
106 | } | |
107 | ||
5c31252c BB |
108 | static inline bool pwm_is_enabled(const struct pwm_device *pwm) |
109 | { | |
09a7e4a3 BB |
110 | struct pwm_state state; |
111 | ||
112 | pwm_get_state(pwm, &state); | |
113 | ||
114 | return state.enabled; | |
5c31252c BB |
115 | } |
116 | ||
a9d887dc | 117 | static inline void pwm_set_period(struct pwm_device *pwm, u64 period) |
f051c466 TR |
118 | { |
119 | if (pwm) | |
43a276b0 | 120 | pwm->state.period = period; |
f051c466 TR |
121 | } |
122 | ||
a9d887dc | 123 | static inline u64 pwm_get_period(const struct pwm_device *pwm) |
f051c466 | 124 | { |
43a276b0 BB |
125 | struct pwm_state state; |
126 | ||
127 | pwm_get_state(pwm, &state); | |
128 | ||
129 | return state.period; | |
f051c466 TR |
130 | } |
131 | ||
76abbdde HS |
132 | static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty) |
133 | { | |
134 | if (pwm) | |
43a276b0 | 135 | pwm->state.duty_cycle = duty; |
76abbdde HS |
136 | } |
137 | ||
a9d887dc | 138 | static inline u64 pwm_get_duty_cycle(const struct pwm_device *pwm) |
76abbdde | 139 | { |
43a276b0 BB |
140 | struct pwm_state state; |
141 | ||
142 | pwm_get_state(pwm, &state); | |
143 | ||
144 | return state.duty_cycle; | |
76abbdde HS |
145 | } |
146 | ||
011e7631 BB |
147 | static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) |
148 | { | |
43a276b0 BB |
149 | struct pwm_state state; |
150 | ||
151 | pwm_get_state(pwm, &state); | |
152 | ||
153 | return state.polarity; | |
011e7631 BB |
154 | } |
155 | ||
e39c0df1 BB |
156 | static inline void pwm_get_args(const struct pwm_device *pwm, |
157 | struct pwm_args *args) | |
158 | { | |
159 | *args = pwm->args; | |
160 | } | |
161 | ||
a6a0dbbc BB |
162 | /** |
163 | * pwm_init_state() - prepare a new state to be applied with pwm_apply_state() | |
164 | * @pwm: PWM device | |
165 | * @state: state to fill with the prepared PWM state | |
166 | * | |
167 | * This functions prepares a state that can later be tweaked and applied | |
168 | * to the PWM device with pwm_apply_state(). This is a convenient function | |
169 | * that first retrieves the current PWM state and the replaces the period | |
170 | * and polarity fields with the reference values defined in pwm->args. | |
171 | * Once the function returns, you can adjust the ->enabled and ->duty_cycle | |
172 | * fields according to your needs before calling pwm_apply_state(). | |
173 | * | |
174 | * ->duty_cycle is initially set to zero to avoid cases where the current | |
175 | * ->duty_cycle value exceed the pwm_args->period one, which would trigger | |
176 | * an error if the user calls pwm_apply_state() without adjusting ->duty_cycle | |
177 | * first. | |
178 | */ | |
179 | static inline void pwm_init_state(const struct pwm_device *pwm, | |
180 | struct pwm_state *state) | |
181 | { | |
182 | struct pwm_args args; | |
183 | ||
184 | /* First get the current state. */ | |
185 | pwm_get_state(pwm, state); | |
186 | ||
187 | /* Then fill it with the reference config */ | |
188 | pwm_get_args(pwm, &args); | |
189 | ||
190 | state->period = args.period; | |
191 | state->polarity = args.polarity; | |
192 | state->duty_cycle = 0; | |
9e40ee18 | 193 | state->usage_power = false; |
a6a0dbbc BB |
194 | } |
195 | ||
f6f3bddf BB |
196 | /** |
197 | * pwm_get_relative_duty_cycle() - Get a relative duty cycle value | |
198 | * @state: PWM state to extract the duty cycle from | |
199 | * @scale: target scale of the relative duty cycle | |
200 | * | |
201 | * This functions converts the absolute duty cycle stored in @state (expressed | |
202 | * in nanosecond) into a value relative to the period. | |
203 | * | |
204 | * For example if you want to get the duty_cycle expressed in percent, call: | |
205 | * | |
206 | * pwm_get_state(pwm, &state); | |
207 | * duty = pwm_get_relative_duty_cycle(&state, 100); | |
208 | */ | |
209 | static inline unsigned int | |
210 | pwm_get_relative_duty_cycle(const struct pwm_state *state, unsigned int scale) | |
211 | { | |
212 | if (!state->period) | |
213 | return 0; | |
214 | ||
215 | return DIV_ROUND_CLOSEST_ULL((u64)state->duty_cycle * scale, | |
216 | state->period); | |
217 | } | |
218 | ||
219 | /** | |
220 | * pwm_set_relative_duty_cycle() - Set a relative duty cycle value | |
221 | * @state: PWM state to fill | |
222 | * @duty_cycle: relative duty cycle value | |
223 | * @scale: scale in which @duty_cycle is expressed | |
224 | * | |
225 | * This functions converts a relative into an absolute duty cycle (expressed | |
226 | * in nanoseconds), and puts the result in state->duty_cycle. | |
227 | * | |
228 | * For example if you want to configure a 50% duty cycle, call: | |
229 | * | |
230 | * pwm_init_state(pwm, &state); | |
231 | * pwm_set_relative_duty_cycle(&state, 50, 100); | |
232 | * pwm_apply_state(pwm, &state); | |
233 | * | |
234 | * This functions returns -EINVAL if @duty_cycle and/or @scale are | |
235 | * inconsistent (@scale == 0 or @duty_cycle > @scale). | |
236 | */ | |
237 | static inline int | |
238 | pwm_set_relative_duty_cycle(struct pwm_state *state, unsigned int duty_cycle, | |
239 | unsigned int scale) | |
240 | { | |
241 | if (!scale || duty_cycle > scale) | |
242 | return -EINVAL; | |
243 | ||
244 | state->duty_cycle = DIV_ROUND_CLOSEST_ULL((u64)duty_cycle * | |
245 | state->period, | |
246 | scale); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
ef2e35d9 UKK |
251 | /** |
252 | * struct pwm_capture - PWM capture data | |
253 | * @period: period of the PWM signal (in nanoseconds) | |
254 | * @duty_cycle: duty cycle of the PWM signal (in nanoseconds) | |
255 | */ | |
256 | struct pwm_capture { | |
257 | unsigned int period; | |
258 | unsigned int duty_cycle; | |
259 | }; | |
260 | ||
0c2498f1 SH |
261 | /** |
262 | * struct pwm_ops - PWM controller operations | |
263 | * @request: optional hook for requesting a PWM | |
264 | * @free: optional hook for freeing a PWM | |
3a3d1a4e | 265 | * @capture: capture and report PWM signal |
27938fd8 | 266 | * @apply: atomically apply a new PWM config |
15fa8a43 BB |
267 | * @get_state: get the current PWM state. This function is only |
268 | * called once per PWM device when the PWM chip is | |
269 | * registered. | |
0c2498f1 SH |
270 | * @owner: helps prevent removal of modules exporting active PWMs |
271 | */ | |
272 | struct pwm_ops { | |
6bc7064a TR |
273 | int (*request)(struct pwm_chip *chip, struct pwm_device *pwm); |
274 | void (*free)(struct pwm_chip *chip, struct pwm_device *pwm); | |
3a3d1a4e LJ |
275 | int (*capture)(struct pwm_chip *chip, struct pwm_device *pwm, |
276 | struct pwm_capture *result, unsigned long timeout); | |
5ec803ed | 277 | int (*apply)(struct pwm_chip *chip, struct pwm_device *pwm, |
71523d18 | 278 | const struct pwm_state *state); |
6c452cff UKK |
279 | int (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, |
280 | struct pwm_state *state); | |
6bc7064a | 281 | struct module *owner; |
0c2498f1 SH |
282 | }; |
283 | ||
284 | /** | |
f051c466 TR |
285 | * struct pwm_chip - abstract a PWM controller |
286 | * @dev: device providing the PWMs | |
f051c466 TR |
287 | * @ops: callbacks for this PWM controller |
288 | * @base: number of first PWM controlled by this chip | |
289 | * @npwm: number of PWMs controlled by this chip | |
04883802 TR |
290 | * @of_xlate: request a PWM device given a device tree PWM specifier |
291 | * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier | |
5d0a4c11 UKK |
292 | * @list: list node for internal use |
293 | * @pwms: array of PWM devices allocated by the framework | |
0c2498f1 SH |
294 | */ |
295 | struct pwm_chip { | |
6bc7064a | 296 | struct device *dev; |
6bc7064a TR |
297 | const struct pwm_ops *ops; |
298 | int base; | |
299 | unsigned int npwm; | |
300 | ||
6bc7064a TR |
301 | struct pwm_device * (*of_xlate)(struct pwm_chip *pc, |
302 | const struct of_phandle_args *args); | |
303 | unsigned int of_pwm_n_cells; | |
5d0a4c11 UKK |
304 | |
305 | /* only used internally by the PWM framework */ | |
306 | struct list_head list; | |
307 | struct pwm_device *pwms; | |
0c2498f1 SH |
308 | }; |
309 | ||
0bcf168b | 310 | #if IS_ENABLED(CONFIG_PWM) |
5ec803ed BB |
311 | /* PWM user APIs */ |
312 | struct pwm_device *pwm_request(int pwm_id, const char *label); | |
313 | void pwm_free(struct pwm_device *pwm); | |
71523d18 | 314 | int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state); |
5ec803ed BB |
315 | int pwm_adjust_config(struct pwm_device *pwm); |
316 | ||
317 | /** | |
318 | * pwm_config() - change a PWM device configuration | |
319 | * @pwm: PWM device | |
320 | * @duty_ns: "on" time (in nanoseconds) | |
321 | * @period_ns: duration (in nanoseconds) of one cycle | |
322 | * | |
323 | * Returns: 0 on success or a negative error code on failure. | |
324 | */ | |
325 | static inline int pwm_config(struct pwm_device *pwm, int duty_ns, | |
326 | int period_ns) | |
327 | { | |
328 | struct pwm_state state; | |
329 | ||
330 | if (!pwm) | |
331 | return -EINVAL; | |
332 | ||
ef2bf499 BN |
333 | if (duty_ns < 0 || period_ns < 0) |
334 | return -EINVAL; | |
335 | ||
5ec803ed BB |
336 | pwm_get_state(pwm, &state); |
337 | if (state.duty_cycle == duty_ns && state.period == period_ns) | |
338 | return 0; | |
339 | ||
340 | state.duty_cycle = duty_ns; | |
341 | state.period = period_ns; | |
342 | return pwm_apply_state(pwm, &state); | |
343 | } | |
344 | ||
5ec803ed BB |
345 | /** |
346 | * pwm_enable() - start a PWM output toggling | |
347 | * @pwm: PWM device | |
348 | * | |
349 | * Returns: 0 on success or a negative error code on failure. | |
350 | */ | |
351 | static inline int pwm_enable(struct pwm_device *pwm) | |
352 | { | |
353 | struct pwm_state state; | |
354 | ||
355 | if (!pwm) | |
356 | return -EINVAL; | |
357 | ||
358 | pwm_get_state(pwm, &state); | |
359 | if (state.enabled) | |
360 | return 0; | |
361 | ||
362 | state.enabled = true; | |
363 | return pwm_apply_state(pwm, &state); | |
364 | } | |
365 | ||
366 | /** | |
367 | * pwm_disable() - stop a PWM output toggling | |
368 | * @pwm: PWM device | |
369 | */ | |
370 | static inline void pwm_disable(struct pwm_device *pwm) | |
371 | { | |
372 | struct pwm_state state; | |
373 | ||
374 | if (!pwm) | |
375 | return; | |
376 | ||
377 | pwm_get_state(pwm, &state); | |
378 | if (!state.enabled) | |
379 | return; | |
380 | ||
381 | state.enabled = false; | |
382 | pwm_apply_state(pwm, &state); | |
383 | } | |
384 | ||
5ec803ed | 385 | /* PWM provider APIs */ |
3a3d1a4e LJ |
386 | int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, |
387 | unsigned long timeout); | |
f051c466 TR |
388 | int pwm_set_chip_data(struct pwm_device *pwm, void *data); |
389 | void *pwm_get_chip_data(struct pwm_device *pwm); | |
390 | ||
0c2498f1 | 391 | int pwmchip_add(struct pwm_chip *chip); |
8083f58d | 392 | void pwmchip_remove(struct pwm_chip *chip); |
bcda91bf UKK |
393 | |
394 | int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip); | |
395 | ||
f051c466 TR |
396 | struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, |
397 | unsigned int index, | |
398 | const char *label); | |
8138d2dd | 399 | |
83af2402 PA |
400 | struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc, |
401 | const struct of_phandle_args *args); | |
3ab7b6ac BA |
402 | struct pwm_device *of_pwm_single_xlate(struct pwm_chip *pc, |
403 | const struct of_phandle_args *args); | |
83af2402 | 404 | |
d4c0c470 | 405 | struct pwm_device *pwm_get(struct device *dev, const char *con_id); |
8138d2dd TR |
406 | void pwm_put(struct pwm_device *pwm); |
407 | ||
d4c0c470 | 408 | struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id); |
4a6ef8e3 NV |
409 | struct pwm_device *devm_fwnode_pwm_get(struct device *dev, |
410 | struct fwnode_handle *fwnode, | |
411 | const char *con_id); | |
0bcf168b | 412 | #else |
5ec803ed BB |
413 | static inline struct pwm_device *pwm_request(int pwm_id, const char *label) |
414 | { | |
27d9a4d6 | 415 | might_sleep(); |
5ec803ed BB |
416 | return ERR_PTR(-ENODEV); |
417 | } | |
418 | ||
419 | static inline void pwm_free(struct pwm_device *pwm) | |
420 | { | |
27d9a4d6 | 421 | might_sleep(); |
5ec803ed BB |
422 | } |
423 | ||
424 | static inline int pwm_apply_state(struct pwm_device *pwm, | |
425 | const struct pwm_state *state) | |
426 | { | |
4ad91a22 | 427 | might_sleep(); |
5ec803ed BB |
428 | return -ENOTSUPP; |
429 | } | |
430 | ||
431 | static inline int pwm_adjust_config(struct pwm_device *pwm) | |
432 | { | |
433 | return -ENOTSUPP; | |
434 | } | |
435 | ||
436 | static inline int pwm_config(struct pwm_device *pwm, int duty_ns, | |
437 | int period_ns) | |
438 | { | |
4ad91a22 | 439 | might_sleep(); |
5ec803ed BB |
440 | return -EINVAL; |
441 | } | |
442 | ||
5ec803ed BB |
443 | static inline int pwm_enable(struct pwm_device *pwm) |
444 | { | |
4ad91a22 | 445 | might_sleep(); |
5ec803ed BB |
446 | return -EINVAL; |
447 | } | |
448 | ||
449 | static inline void pwm_disable(struct pwm_device *pwm) | |
450 | { | |
4ad91a22 | 451 | might_sleep(); |
5ec803ed BB |
452 | } |
453 | ||
b3c650ad GU |
454 | static inline int pwm_capture(struct pwm_device *pwm, |
455 | struct pwm_capture *result, | |
456 | unsigned long timeout) | |
457 | { | |
458 | return -EINVAL; | |
459 | } | |
460 | ||
0bcf168b TB |
461 | static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data) |
462 | { | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | static inline void *pwm_get_chip_data(struct pwm_device *pwm) | |
467 | { | |
468 | return NULL; | |
469 | } | |
470 | ||
471 | static inline int pwmchip_add(struct pwm_chip *chip) | |
472 | { | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | static inline int pwmchip_remove(struct pwm_chip *chip) | |
477 | { | |
478 | return -EINVAL; | |
479 | } | |
480 | ||
88da4e81 AS |
481 | static inline int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip) |
482 | { | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
0bcf168b TB |
486 | static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, |
487 | unsigned int index, | |
488 | const char *label) | |
489 | { | |
27d9a4d6 | 490 | might_sleep(); |
0bcf168b TB |
491 | return ERR_PTR(-ENODEV); |
492 | } | |
493 | ||
494 | static inline struct pwm_device *pwm_get(struct device *dev, | |
495 | const char *consumer) | |
496 | { | |
27d9a4d6 | 497 | might_sleep(); |
0bcf168b TB |
498 | return ERR_PTR(-ENODEV); |
499 | } | |
500 | ||
501 | static inline void pwm_put(struct pwm_device *pwm) | |
502 | { | |
27d9a4d6 | 503 | might_sleep(); |
0bcf168b TB |
504 | } |
505 | ||
506 | static inline struct pwm_device *devm_pwm_get(struct device *dev, | |
507 | const char *consumer) | |
508 | { | |
27d9a4d6 | 509 | might_sleep(); |
0bcf168b TB |
510 | return ERR_PTR(-ENODEV); |
511 | } | |
512 | ||
4a6ef8e3 NV |
513 | static inline struct pwm_device * |
514 | devm_fwnode_pwm_get(struct device *dev, struct fwnode_handle *fwnode, | |
515 | const char *con_id) | |
516 | { | |
27d9a4d6 | 517 | might_sleep(); |
4a6ef8e3 NV |
518 | return ERR_PTR(-ENODEV); |
519 | } | |
0bcf168b | 520 | #endif |
6354316d | 521 | |
5ec803ed BB |
522 | static inline void pwm_apply_args(struct pwm_device *pwm) |
523 | { | |
33cdcee0 BB |
524 | struct pwm_state state = { }; |
525 | ||
5ec803ed BB |
526 | /* |
527 | * PWM users calling pwm_apply_args() expect to have a fresh config | |
528 | * where the polarity and period are set according to pwm_args info. | |
529 | * The problem is, polarity can only be changed when the PWM is | |
530 | * disabled. | |
531 | * | |
532 | * PWM drivers supporting hardware readout may declare the PWM device | |
533 | * as enabled, and prevent polarity setting, which changes from the | |
534 | * existing behavior, where all PWM devices are declared as disabled | |
535 | * at startup (even if they are actually enabled), thus authorizing | |
536 | * polarity setting. | |
537 | * | |
33cdcee0 BB |
538 | * To fulfill this requirement, we apply a new state which disables |
539 | * the PWM device and set the reference period and polarity config. | |
5ec803ed BB |
540 | * |
541 | * Note that PWM users requiring a smooth handover between the | |
542 | * bootloader and the kernel (like critical regulators controlled by | |
543 | * PWM devices) will have to switch to the atomic API and avoid calling | |
544 | * pwm_apply_args(). | |
545 | */ | |
33cdcee0 BB |
546 | |
547 | state.enabled = false; | |
548 | state.polarity = pwm->args.polarity; | |
549 | state.period = pwm->args.period; | |
9e40ee18 | 550 | state.usage_power = false; |
33cdcee0 BB |
551 | |
552 | pwm_apply_state(pwm, &state); | |
5ec803ed BB |
553 | } |
554 | ||
8138d2dd TR |
555 | struct pwm_lookup { |
556 | struct list_head list; | |
557 | const char *provider; | |
558 | unsigned int index; | |
559 | const char *dev_id; | |
560 | const char *con_id; | |
3796ce1d AB |
561 | unsigned int period; |
562 | enum pwm_polarity polarity; | |
b526a314 | 563 | const char *module; /* optional, may be NULL */ |
8138d2dd TR |
564 | }; |
565 | ||
b526a314 HG |
566 | #define PWM_LOOKUP_WITH_MODULE(_provider, _index, _dev_id, _con_id, \ |
567 | _period, _polarity, _module) \ | |
568 | { \ | |
569 | .provider = _provider, \ | |
570 | .index = _index, \ | |
571 | .dev_id = _dev_id, \ | |
572 | .con_id = _con_id, \ | |
573 | .period = _period, \ | |
574 | .polarity = _polarity, \ | |
575 | .module = _module, \ | |
8138d2dd TR |
576 | } |
577 | ||
b526a314 HG |
578 | #define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \ |
579 | PWM_LOOKUP_WITH_MODULE(_provider, _index, _dev_id, _con_id, _period, \ | |
580 | _polarity, NULL) | |
581 | ||
0bcf168b | 582 | #if IS_ENABLED(CONFIG_PWM) |
8138d2dd | 583 | void pwm_add_table(struct pwm_lookup *table, size_t num); |
efb0de55 | 584 | void pwm_remove_table(struct pwm_lookup *table, size_t num); |
0bcf168b TB |
585 | #else |
586 | static inline void pwm_add_table(struct pwm_lookup *table, size_t num) | |
587 | { | |
588 | } | |
efb0de55 SK |
589 | |
590 | static inline void pwm_remove_table(struct pwm_lookup *table, size_t num) | |
591 | { | |
592 | } | |
0c2498f1 SH |
593 | #endif |
594 | ||
76abbdde HS |
595 | #ifdef CONFIG_PWM_SYSFS |
596 | void pwmchip_sysfs_export(struct pwm_chip *chip); | |
597 | void pwmchip_sysfs_unexport(struct pwm_chip *chip); | |
598 | #else | |
599 | static inline void pwmchip_sysfs_export(struct pwm_chip *chip) | |
600 | { | |
601 | } | |
602 | ||
603 | static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip) | |
604 | { | |
605 | } | |
606 | #endif /* CONFIG_PWM_SYSFS */ | |
607 | ||
5243ef8b | 608 | #endif /* __LINUX_PWM_H */ |