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Sascha Hauer0c2498f2011-01-28 09:40:40 +01001/*
2 * Generic pwmlib implementation
3 *
4 * Copyright (C) 2011 Sascha Hauer <s.hauer@pengutronix.de>
Thierry Redingf051c462011-12-14 11:12:23 +01005 * Copyright (C) 2011-2012 Avionic Design GmbH
Sascha Hauer0c2498f2011-01-28 09:40:40 +01006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; see the file COPYING. If not, write to
19 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include <linux/module.h>
23#include <linux/pwm.h>
Thierry Redingf051c462011-12-14 11:12:23 +010024#include <linux/radix-tree.h>
Sascha Hauer0c2498f2011-01-28 09:40:40 +010025#include <linux/list.h>
26#include <linux/mutex.h>
27#include <linux/err.h>
28#include <linux/slab.h>
29#include <linux/device.h>
Thierry Reding62099ab2012-03-26 09:31:48 +020030#include <linux/debugfs.h>
31#include <linux/seq_file.h>
Sascha Hauer0c2498f2011-01-28 09:40:40 +010032
Laurent Pinchart208be762013-07-18 00:54:22 +020033#include <dt-bindings/pwm/pwm.h>
Sascha Hauer0c2498f2011-01-28 09:40:40 +010034
Laurent Pinchart208be762013-07-18 00:54:22 +020035#define MAX_PWMS 1024
Philip, Avinash83af2402012-11-21 13:10:44 +053036
Thierry Reding8138d2d2012-03-26 08:42:48 +020037static DEFINE_MUTEX(pwm_lookup_lock);
38static LIST_HEAD(pwm_lookup_list);
Sascha Hauer0c2498f2011-01-28 09:40:40 +010039static DEFINE_MUTEX(pwm_lock);
Thierry Redingf051c462011-12-14 11:12:23 +010040static LIST_HEAD(pwm_chips);
41static DECLARE_BITMAP(allocated_pwms, MAX_PWMS);
42static RADIX_TREE(pwm_tree, GFP_KERNEL);
Sascha Hauer0c2498f2011-01-28 09:40:40 +010043
Thierry Redingf051c462011-12-14 11:12:23 +010044static struct pwm_device *pwm_to_device(unsigned int pwm)
Sascha Hauer0c2498f2011-01-28 09:40:40 +010045{
Thierry Redingf051c462011-12-14 11:12:23 +010046 return radix_tree_lookup(&pwm_tree, pwm);
47}
Sascha Hauer0c2498f2011-01-28 09:40:40 +010048
Thierry Redingf051c462011-12-14 11:12:23 +010049static int alloc_pwms(int pwm, unsigned int count)
50{
51 unsigned int from = 0;
52 unsigned int start;
53
54 if (pwm >= MAX_PWMS)
55 return -EINVAL;
56
57 if (pwm >= 0)
58 from = pwm;
59
60 start = bitmap_find_next_zero_area(allocated_pwms, MAX_PWMS, from,
61 count, 0);
62
63 if (pwm >= 0 && start != pwm)
64 return -EEXIST;
65
66 if (start + count > MAX_PWMS)
67 return -ENOSPC;
68
69 return start;
70}
71
72static void free_pwms(struct pwm_chip *chip)
73{
74 unsigned int i;
75
76 for (i = 0; i < chip->npwm; i++) {
77 struct pwm_device *pwm = &chip->pwms[i];
Thierry Reding83a98862016-05-02 12:05:55 +020078
Thierry Redingf051c462011-12-14 11:12:23 +010079 radix_tree_delete(&pwm_tree, pwm->pwm);
Sascha Hauer0c2498f2011-01-28 09:40:40 +010080 }
81
Thierry Redingf051c462011-12-14 11:12:23 +010082 bitmap_clear(allocated_pwms, chip->base, chip->npwm);
83
84 kfree(chip->pwms);
85 chip->pwms = NULL;
86}
87
Thierry Reding8138d2d2012-03-26 08:42:48 +020088static struct pwm_chip *pwmchip_find_by_name(const char *name)
89{
90 struct pwm_chip *chip;
91
92 if (!name)
93 return NULL;
94
95 mutex_lock(&pwm_lock);
96
97 list_for_each_entry(chip, &pwm_chips, list) {
98 const char *chip_name = dev_name(chip->dev);
99
100 if (chip_name && strcmp(chip_name, name) == 0) {
101 mutex_unlock(&pwm_lock);
102 return chip;
103 }
104 }
105
106 mutex_unlock(&pwm_lock);
107
108 return NULL;
109}
110
Thierry Redingf051c462011-12-14 11:12:23 +0100111static int pwm_device_request(struct pwm_device *pwm, const char *label)
112{
113 int err;
114
115 if (test_bit(PWMF_REQUESTED, &pwm->flags))
116 return -EBUSY;
117
118 if (!try_module_get(pwm->chip->ops->owner))
119 return -ENODEV;
120
121 if (pwm->chip->ops->request) {
122 err = pwm->chip->ops->request(pwm->chip, pwm);
123 if (err) {
124 module_put(pwm->chip->ops->owner);
125 return err;
126 }
127 }
128
129 set_bit(PWMF_REQUESTED, &pwm->flags);
130 pwm->label = label;
131
132 return 0;
133}
134
Philip, Avinash83af2402012-11-21 13:10:44 +0530135struct pwm_device *
136of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
137{
138 struct pwm_device *pwm;
139
Lothar Wassmann42883cb2017-01-29 22:54:13 +0100140 /* check, whether the driver supports a third cell for flags */
Philip, Avinash83af2402012-11-21 13:10:44 +0530141 if (pc->of_pwm_n_cells < 3)
142 return ERR_PTR(-EINVAL);
143
Lothar Wassmann42883cb2017-01-29 22:54:13 +0100144 /* flags in the third cell are optional */
145 if (args->args_count < 2)
146 return ERR_PTR(-EINVAL);
147
Philip, Avinash83af2402012-11-21 13:10:44 +0530148 if (args->args[0] >= pc->npwm)
149 return ERR_PTR(-EINVAL);
150
151 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
152 if (IS_ERR(pwm))
153 return pwm;
154
Boris Brezillone39c0df2016-04-14 21:17:21 +0200155 pwm->args.period = args->args[1];
Lothar Wassmann42883cb2017-01-29 22:54:13 +0100156 pwm->args.polarity = PWM_POLARITY_NORMAL;
Philip, Avinash83af2402012-11-21 13:10:44 +0530157
Lothar Wassmann42883cb2017-01-29 22:54:13 +0100158 if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
Boris Brezillone39c0df2016-04-14 21:17:21 +0200159 pwm->args.polarity = PWM_POLARITY_INVERSED;
Philip, Avinash83af2402012-11-21 13:10:44 +0530160
161 return pwm;
162}
Thierry Reding417328c2012-11-28 15:12:07 +0100163EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
Philip, Avinash83af2402012-11-21 13:10:44 +0530164
Sachin Kamate50d3522012-08-10 16:41:13 +0530165static struct pwm_device *
166of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
Thierry Reding7299ab72011-12-14 11:10:32 +0100167{
168 struct pwm_device *pwm;
169
Lothar Wassmann42883cb2017-01-29 22:54:13 +0100170 /* sanity check driver support */
Thierry Reding7299ab72011-12-14 11:10:32 +0100171 if (pc->of_pwm_n_cells < 2)
172 return ERR_PTR(-EINVAL);
173
Lothar Wassmann42883cb2017-01-29 22:54:13 +0100174 /* all cells are required */
175 if (args->args_count != pc->of_pwm_n_cells)
176 return ERR_PTR(-EINVAL);
177
Thierry Reding7299ab72011-12-14 11:10:32 +0100178 if (args->args[0] >= pc->npwm)
179 return ERR_PTR(-EINVAL);
180
181 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
182 if (IS_ERR(pwm))
183 return pwm;
184
Boris Brezillone39c0df2016-04-14 21:17:21 +0200185 pwm->args.period = args->args[1];
Thierry Reding7299ab72011-12-14 11:10:32 +0100186
187 return pwm;
188}
189
Sachin Kamatdfeb86e2012-08-02 12:32:42 +0530190static void of_pwmchip_add(struct pwm_chip *chip)
Thierry Reding7299ab72011-12-14 11:10:32 +0100191{
192 if (!chip->dev || !chip->dev->of_node)
193 return;
194
195 if (!chip->of_xlate) {
196 chip->of_xlate = of_pwm_simple_xlate;
197 chip->of_pwm_n_cells = 2;
198 }
199
200 of_node_get(chip->dev->of_node);
201}
202
Sachin Kamatdfeb86e2012-08-02 12:32:42 +0530203static void of_pwmchip_remove(struct pwm_chip *chip)
Thierry Reding7299ab72011-12-14 11:10:32 +0100204{
Markus Elfring8d6cc072015-02-03 11:54:28 +0100205 if (chip->dev)
Thierry Reding7299ab72011-12-14 11:10:32 +0100206 of_node_put(chip->dev->of_node);
207}
208
Thierry Redingf051c462011-12-14 11:12:23 +0100209/**
210 * pwm_set_chip_data() - set private chip data for a PWM
211 * @pwm: PWM device
212 * @data: pointer to chip-specific data
Thierry Reding04883802015-07-27 11:58:32 +0200213 *
214 * Returns: 0 on success or a negative error code on failure.
Thierry Redingf051c462011-12-14 11:12:23 +0100215 */
216int pwm_set_chip_data(struct pwm_device *pwm, void *data)
217{
218 if (!pwm)
219 return -EINVAL;
220
221 pwm->chip_data = data;
222
223 return 0;
224}
Thierry Reding928c4472013-01-30 09:22:24 +0100225EXPORT_SYMBOL_GPL(pwm_set_chip_data);
Thierry Redingf051c462011-12-14 11:12:23 +0100226
227/**
228 * pwm_get_chip_data() - get private chip data for a PWM
229 * @pwm: PWM device
Thierry Reding04883802015-07-27 11:58:32 +0200230 *
231 * Returns: A pointer to the chip-private data for the PWM device.
Thierry Redingf051c462011-12-14 11:12:23 +0100232 */
233void *pwm_get_chip_data(struct pwm_device *pwm)
234{
235 return pwm ? pwm->chip_data : NULL;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100236}
Thierry Reding928c4472013-01-30 09:22:24 +0100237EXPORT_SYMBOL_GPL(pwm_get_chip_data);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100238
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200239static bool pwm_ops_check(const struct pwm_ops *ops)
240{
241 /* driver supports legacy, non-atomic operation */
242 if (ops->config && ops->enable && ops->disable)
243 return true;
244
245 /* driver supports atomic operation */
246 if (ops->apply)
247 return true;
248
249 return false;
250}
251
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100252/**
Tim Krygerb6a00fa2015-05-26 13:08:16 -0700253 * pwmchip_add_with_polarity() - register a new PWM chip
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100254 * @chip: the PWM chip to add
Tim Krygerb6a00fa2015-05-26 13:08:16 -0700255 * @polarity: initial polarity of PWM channels
Thierry Redingf051c462011-12-14 11:12:23 +0100256 *
257 * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
Tim Krygerb6a00fa2015-05-26 13:08:16 -0700258 * will be used. The initial polarity for all channels is specified by the
259 * @polarity parameter.
Thierry Reding04883802015-07-27 11:58:32 +0200260 *
261 * Returns: 0 on success or a negative error code on failure.
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100262 */
Tim Krygerb6a00fa2015-05-26 13:08:16 -0700263int pwmchip_add_with_polarity(struct pwm_chip *chip,
264 enum pwm_polarity polarity)
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100265{
266 struct pwm_device *pwm;
Thierry Redingf051c462011-12-14 11:12:23 +0100267 unsigned int i;
268 int ret;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100269
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200270 if (!chip || !chip->dev || !chip->ops || !chip->npwm)
271 return -EINVAL;
272
273 if (!pwm_ops_check(chip->ops))
Thierry Redingf051c462011-12-14 11:12:23 +0100274 return -EINVAL;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100275
276 mutex_lock(&pwm_lock);
277
Thierry Redingf051c462011-12-14 11:12:23 +0100278 ret = alloc_pwms(chip->base, chip->npwm);
279 if (ret < 0)
280 goto out;
281
Thierry Reding2907f8a2016-05-02 12:07:34 +0200282 chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
Thierry Redingf051c462011-12-14 11:12:23 +0100283 if (!chip->pwms) {
284 ret = -ENOMEM;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100285 goto out;
286 }
287
Thierry Redingf051c462011-12-14 11:12:23 +0100288 chip->base = ret;
289
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;
Boris Brezillon43a276b2016-04-14 21:17:38 +0200296 pwm->state.polarity = polarity;
Thierry Redingf051c462011-12-14 11:12:23 +0100297
Boris Brezillon15fa8a432016-04-14 21:17:40 +0200298 if (chip->ops->get_state)
299 chip->ops->get_state(chip, pwm, &pwm->state);
Thierry Redingf051c462011-12-14 11:12:23 +0100300
301 radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
302 }
303
304 bitmap_set(allocated_pwms, chip->base, chip->npwm);
305
306 INIT_LIST_HEAD(&chip->list);
307 list_add(&chip->list, &pwm_chips);
308
309 ret = 0;
310
Thierry Reding7299ab72011-12-14 11:10:32 +0100311 if (IS_ENABLED(CONFIG_OF))
312 of_pwmchip_add(chip);
313
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100314out:
315 mutex_unlock(&pwm_lock);
Phong Hoang347ab942019-03-19 19:40:08 +0900316
317 if (!ret)
318 pwmchip_sysfs_export(chip);
319
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100320 return ret;
321}
Tim Krygerb6a00fa2015-05-26 13:08:16 -0700322EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity);
323
324/**
325 * pwmchip_add() - register a new PWM chip
326 * @chip: the PWM chip to add
327 *
328 * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
329 * will be used. The initial polarity for all channels is normal.
Thierry Reding04883802015-07-27 11:58:32 +0200330 *
331 * Returns: 0 on success or a negative error code on failure.
Tim Krygerb6a00fa2015-05-26 13:08:16 -0700332 */
333int pwmchip_add(struct pwm_chip *chip)
334{
335 return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL);
336}
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100337EXPORT_SYMBOL_GPL(pwmchip_add);
338
339/**
340 * pwmchip_remove() - remove a PWM chip
341 * @chip: the PWM chip to remove
342 *
343 * Removes a PWM chip. This function may return busy if the PWM chip provides
344 * a PWM device that is still requested.
Thierry Reding04883802015-07-27 11:58:32 +0200345 *
346 * Returns: 0 on success or a negative error code on failure.
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100347 */
348int pwmchip_remove(struct pwm_chip *chip)
349{
Thierry Redingf051c462011-12-14 11:12:23 +0100350 unsigned int i;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100351 int ret = 0;
352
Phong Hoang347ab942019-03-19 19:40:08 +0900353 pwmchip_sysfs_unexport(chip);
David Hsu07334242016-08-09 14:57:46 -0700354
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100355 mutex_lock(&pwm_lock);
356
Thierry Redingf051c462011-12-14 11:12:23 +0100357 for (i = 0; i < chip->npwm; i++) {
358 struct pwm_device *pwm = &chip->pwms[i];
359
360 if (test_bit(PWMF_REQUESTED, &pwm->flags)) {
361 ret = -EBUSY;
362 goto out;
363 }
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100364 }
365
Thierry Redingf051c462011-12-14 11:12:23 +0100366 list_del_init(&chip->list);
Thierry Reding7299ab72011-12-14 11:10:32 +0100367
368 if (IS_ENABLED(CONFIG_OF))
369 of_pwmchip_remove(chip);
370
Thierry Redingf051c462011-12-14 11:12:23 +0100371 free_pwms(chip);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100372
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100373out:
374 mutex_unlock(&pwm_lock);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100375 return ret;
376}
377EXPORT_SYMBOL_GPL(pwmchip_remove);
378
379/**
380 * pwm_request() - request a PWM device
Thierry Reding04883802015-07-27 11:58:32 +0200381 * @pwm: global PWM device index
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100382 * @label: PWM device label
Thierry Reding8138d2d2012-03-26 08:42:48 +0200383 *
384 * This function is deprecated, use pwm_get() instead.
Thierry Reding04883802015-07-27 11:58:32 +0200385 *
386 * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on
387 * failure.
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100388 */
Thierry Redingf051c462011-12-14 11:12:23 +0100389struct pwm_device *pwm_request(int pwm, const char *label)
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100390{
Thierry Redingf051c462011-12-14 11:12:23 +0100391 struct pwm_device *dev;
392 int err;
393
394 if (pwm < 0 || pwm >= MAX_PWMS)
395 return ERR_PTR(-EINVAL);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100396
397 mutex_lock(&pwm_lock);
398
Thierry Redingf051c462011-12-14 11:12:23 +0100399 dev = pwm_to_device(pwm);
400 if (!dev) {
401 dev = ERR_PTR(-EPROBE_DEFER);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100402 goto out;
403 }
404
Thierry Redingf051c462011-12-14 11:12:23 +0100405 err = pwm_device_request(dev, label);
406 if (err < 0)
407 dev = ERR_PTR(err);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100408
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100409out:
410 mutex_unlock(&pwm_lock);
411
Thierry Redingf051c462011-12-14 11:12:23 +0100412 return dev;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100413}
414EXPORT_SYMBOL_GPL(pwm_request);
415
416/**
Thierry Redingf051c462011-12-14 11:12:23 +0100417 * pwm_request_from_chip() - request a PWM device relative to a PWM chip
418 * @chip: PWM chip
419 * @index: per-chip index of the PWM to request
420 * @label: a literal description string of this PWM
421 *
Thierry Reding04883802015-07-27 11:58:32 +0200422 * Returns: A pointer to the PWM device at the given index of the given PWM
423 * chip. A negative error code is returned if the index is not valid for the
424 * specified PWM chip or if the PWM device cannot be requested.
Thierry Redingf051c462011-12-14 11:12:23 +0100425 */
426struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
427 unsigned int index,
428 const char *label)
429{
430 struct pwm_device *pwm;
431 int err;
432
433 if (!chip || index >= chip->npwm)
434 return ERR_PTR(-EINVAL);
435
436 mutex_lock(&pwm_lock);
437 pwm = &chip->pwms[index];
438
439 err = pwm_device_request(pwm, label);
440 if (err < 0)
441 pwm = ERR_PTR(err);
442
443 mutex_unlock(&pwm_lock);
444 return pwm;
445}
446EXPORT_SYMBOL_GPL(pwm_request_from_chip);
447
448/**
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100449 * pwm_free() - free a PWM device
450 * @pwm: PWM device
Thierry Reding8138d2d2012-03-26 08:42:48 +0200451 *
452 * This function is deprecated, use pwm_put() instead.
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100453 */
454void pwm_free(struct pwm_device *pwm)
455{
Thierry Reding8138d2d2012-03-26 08:42:48 +0200456 pwm_put(pwm);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100457}
458EXPORT_SYMBOL_GPL(pwm_free);
459
460/**
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200461 * pwm_apply_state() - atomically apply a new state to a PWM device
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100462 * @pwm: PWM device
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200463 * @state: new state to apply. This can be adjusted by the PWM driver
464 * if the requested config is not achievable, for example,
465 * ->duty_cycle and ->period might be approximated.
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100466 */
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200467int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state)
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100468{
H Hartley Sweeten76abbdde2013-06-11 10:38:59 -0700469 int err;
470
Brian Norrisef2bf492016-05-27 09:45:49 -0700471 if (!pwm || !state || !state->period ||
472 state->duty_cycle > state->period)
Jonathan Richardsond1cd2142015-10-16 17:40:58 -0700473 return -EINVAL;
474
Uwe Kleine-König309b32f2019-01-07 20:49:37 +0100475 if (state->period == pwm->state.period &&
476 state->duty_cycle == pwm->state.duty_cycle &&
477 state->polarity == pwm->state.polarity &&
478 state->enabled == pwm->state.enabled)
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200479 return 0;
Jonathan Richardsond1cd2142015-10-16 17:40:58 -0700480
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200481 if (pwm->chip->ops->apply) {
482 err = pwm->chip->ops->apply(pwm->chip, pwm, state);
Jonathan Richardsond1cd2142015-10-16 17:40:58 -0700483 if (err)
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200484 return err;
485
486 pwm->state = *state;
487 } else {
488 /*
489 * FIXME: restore the initial state in case of error.
490 */
491 if (state->polarity != pwm->state.polarity) {
492 if (!pwm->chip->ops->set_polarity)
493 return -ENOTSUPP;
494
495 /*
496 * Changing the polarity of a running PWM is
497 * only allowed when the PWM driver implements
498 * ->apply().
499 */
500 if (pwm->state.enabled) {
501 pwm->chip->ops->disable(pwm->chip, pwm);
502 pwm->state.enabled = false;
503 }
504
505 err = pwm->chip->ops->set_polarity(pwm->chip, pwm,
506 state->polarity);
507 if (err)
508 return err;
509
510 pwm->state.polarity = state->polarity;
511 }
512
513 if (state->period != pwm->state.period ||
514 state->duty_cycle != pwm->state.duty_cycle) {
515 err = pwm->chip->ops->config(pwm->chip, pwm,
516 state->duty_cycle,
517 state->period);
518 if (err)
519 return err;
520
521 pwm->state.duty_cycle = state->duty_cycle;
522 pwm->state.period = state->period;
523 }
524
525 if (state->enabled != pwm->state.enabled) {
526 if (state->enabled) {
527 err = pwm->chip->ops->enable(pwm->chip, pwm);
528 if (err)
529 return err;
530 } else {
531 pwm->chip->ops->disable(pwm->chip, pwm);
532 }
533
534 pwm->state.enabled = state->enabled;
535 }
Jonathan Richardsond1cd2142015-10-16 17:40:58 -0700536 }
537
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200538 return 0;
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100539}
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200540EXPORT_SYMBOL_GPL(pwm_apply_state);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100541
542/**
Lee Jones3a3d1a42016-06-08 10:21:23 +0100543 * pwm_capture() - capture and report a PWM signal
544 * @pwm: PWM device
545 * @result: structure to fill with capture result
546 * @timeout: time to wait, in milliseconds, before giving up on capture
547 *
548 * Returns: 0 on success or a negative error code on failure.
549 */
550int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
551 unsigned long timeout)
552{
553 int err;
554
555 if (!pwm || !pwm->chip->ops)
556 return -EINVAL;
557
558 if (!pwm->chip->ops->capture)
559 return -ENOSYS;
560
561 mutex_lock(&pwm_lock);
562 err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
563 mutex_unlock(&pwm_lock);
564
565 return err;
566}
567EXPORT_SYMBOL_GPL(pwm_capture);
568
569/**
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200570 * pwm_adjust_config() - adjust the current PWM config to the PWM arguments
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100571 * @pwm: PWM device
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200572 *
573 * This function will adjust the PWM config to the PWM arguments provided
574 * by the DT or PWM lookup table. This is particularly useful to adapt
575 * the bootloader config to the Linux one.
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100576 */
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200577int pwm_adjust_config(struct pwm_device *pwm)
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100578{
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200579 struct pwm_state state;
580 struct pwm_args pargs;
Boris Brezillon09a7e4a2016-04-14 21:17:39 +0200581
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200582 pwm_get_args(pwm, &pargs);
583 pwm_get_state(pwm, &state);
584
585 /*
586 * If the current period is zero it means that either the PWM driver
587 * does not support initial state retrieval or the PWM has not yet
588 * been configured.
589 *
590 * In either case, we setup the new period and polarity, and assign a
591 * duty cycle of 0.
592 */
593 if (!state.period) {
594 state.duty_cycle = 0;
595 state.period = pargs.period;
596 state.polarity = pargs.polarity;
597
598 return pwm_apply_state(pwm, &state);
Boris Brezillon09a7e4a2016-04-14 21:17:39 +0200599 }
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200600
601 /*
602 * Adjust the PWM duty cycle/period based on the period value provided
603 * in PWM args.
604 */
605 if (pargs.period != state.period) {
606 u64 dutycycle = (u64)state.duty_cycle * pargs.period;
607
608 do_div(dutycycle, state.period);
609 state.duty_cycle = dutycycle;
610 state.period = pargs.period;
611 }
612
613 /*
614 * If the polarity changed, we should also change the duty cycle.
615 */
616 if (pargs.polarity != state.polarity) {
617 state.polarity = pargs.polarity;
618 state.duty_cycle = state.period - state.duty_cycle;
619 }
620
621 return pwm_apply_state(pwm, &state);
Sascha Hauer0c2498f2011-01-28 09:40:40 +0100622}
Boris Brezillon5ec803e2016-04-14 21:17:41 +0200623EXPORT_SYMBOL_GPL(pwm_adjust_config);
Thierry Reding62099ab2012-03-26 09:31:48 +0200624
Thierry Reding7299ab72011-12-14 11:10:32 +0100625static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
626{
627 struct pwm_chip *chip;
628
629 mutex_lock(&pwm_lock);
630
631 list_for_each_entry(chip, &pwm_chips, list)
632 if (chip->dev && chip->dev->of_node == np) {
633 mutex_unlock(&pwm_lock);
634 return chip;
635 }
636
637 mutex_unlock(&pwm_lock);
638
639 return ERR_PTR(-EPROBE_DEFER);
640}
641
642/**
Peter Ujfalusi8eb96122012-12-21 01:43:58 -0800643 * of_pwm_get() - request a PWM via the PWM framework
Thierry Reding7299ab72011-12-14 11:10:32 +0100644 * @np: device node to get the PWM from
645 * @con_id: consumer name
646 *
647 * Returns the PWM device parsed from the phandle and index specified in the
648 * "pwms" property of a device tree node or a negative error-code on failure.
649 * Values parsed from the device tree are stored in the returned PWM device
650 * object.
651 *
652 * If con_id is NULL, the first PWM device listed in the "pwms" property will
653 * be requested. Otherwise the "pwm-names" property is used to do a reverse
654 * lookup of the PWM index. This also means that the "pwm-names" property
655 * becomes mandatory for devices that look up the PWM device via the con_id
656 * parameter.
Thierry Reding04883802015-07-27 11:58:32 +0200657 *
658 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
659 * error code on failure.
Thierry Reding7299ab72011-12-14 11:10:32 +0100660 */
Peter Ujfalusi8eb96122012-12-21 01:43:58 -0800661struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
Thierry Reding7299ab72011-12-14 11:10:32 +0100662{
663 struct pwm_device *pwm = NULL;
664 struct of_phandle_args args;
665 struct pwm_chip *pc;
666 int index = 0;
667 int err;
668
669 if (con_id) {
670 index = of_property_match_string(np, "pwm-names", con_id);
671 if (index < 0)
672 return ERR_PTR(index);
673 }
674
675 err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index,
676 &args);
677 if (err) {
Lothar Wassmannf2dafc02017-01-29 22:54:05 +0100678 pr_err("%s(): can't parse \"pwms\" property\n", __func__);
Thierry Reding7299ab72011-12-14 11:10:32 +0100679 return ERR_PTR(err);
680 }
681
682 pc = of_node_to_pwmchip(args.np);
683 if (IS_ERR(pc)) {
Jerome Brunet93c292e2017-05-23 18:05:03 +0200684 if (PTR_ERR(pc) != -EPROBE_DEFER)
685 pr_err("%s(): PWM chip not found\n", __func__);
686
Thierry Reding7299ab72011-12-14 11:10:32 +0100687 pwm = ERR_CAST(pc);
688 goto put;
689 }
690
Thierry Reding7299ab72011-12-14 11:10:32 +0100691 pwm = pc->of_xlate(pc, &args);
692 if (IS_ERR(pwm))
693 goto put;
694
695 /*
696 * If a consumer name was not given, try to look it up from the
697 * "pwm-names" property if it exists. Otherwise use the name of
698 * the user device node.
699 */
700 if (!con_id) {
701 err = of_property_read_string_index(np, "pwm-names", index,
702 &con_id);
703 if (err < 0)
704 con_id = np->name;
705 }
706
707 pwm->label = con_id;
708
709put:
710 of_node_put(args.np);
711
712 return pwm;
713}
Peter Ujfalusi8eb96122012-12-21 01:43:58 -0800714EXPORT_SYMBOL_GPL(of_pwm_get);
Thierry Reding7299ab72011-12-14 11:10:32 +0100715
Thierry Reding8138d2d2012-03-26 08:42:48 +0200716/**
717 * pwm_add_table() - register PWM device consumers
718 * @table: array of consumers to register
719 * @num: number of consumers in table
720 */
Shobhit Kumarc264f112015-03-12 22:01:31 +0530721void pwm_add_table(struct pwm_lookup *table, size_t num)
Thierry Reding8138d2d2012-03-26 08:42:48 +0200722{
723 mutex_lock(&pwm_lookup_lock);
724
725 while (num--) {
726 list_add_tail(&table->list, &pwm_lookup_list);
727 table++;
728 }
729
730 mutex_unlock(&pwm_lookup_lock);
731}
732
733/**
Shobhit Kumarefb0de52015-05-05 15:04:18 +0530734 * pwm_remove_table() - unregister PWM device consumers
735 * @table: array of consumers to unregister
736 * @num: number of consumers in table
737 */
738void pwm_remove_table(struct pwm_lookup *table, size_t num)
739{
740 mutex_lock(&pwm_lookup_lock);
741
742 while (num--) {
743 list_del(&table->list);
744 table++;
745 }
746
747 mutex_unlock(&pwm_lookup_lock);
748}
749
750/**
Thierry Reding8138d2d2012-03-26 08:42:48 +0200751 * pwm_get() - look up and request a PWM device
752 * @dev: device for PWM consumer
753 * @con_id: consumer name
754 *
Thierry Reding7299ab72011-12-14 11:10:32 +0100755 * Lookup is first attempted using DT. If the device was not instantiated from
756 * a device tree, a PWM chip and a relative index is looked up via a table
757 * supplied by board setup code (see pwm_add_table()).
Thierry Reding8138d2d2012-03-26 08:42:48 +0200758 *
759 * Once a PWM chip has been found the specified PWM device will be requested
760 * and is ready to be used.
Thierry Reding04883802015-07-27 11:58:32 +0200761 *
762 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
763 * error code on failure.
Thierry Reding8138d2d2012-03-26 08:42:48 +0200764 */
765struct pwm_device *pwm_get(struct device *dev, const char *con_id)
766{
Sachin Kamate50d3522012-08-10 16:41:13 +0530767 const char *dev_id = dev ? dev_name(dev) : NULL;
Hans de Goede69efb342017-01-22 17:14:07 +0100768 struct pwm_device *pwm;
769 struct pwm_chip *chip;
Thierry Reding8138d2d2012-03-26 08:42:48 +0200770 unsigned int best = 0;
Geert Uytterhoeven70145f82014-08-28 11:03:14 +0200771 struct pwm_lookup *p, *chosen = NULL;
Thierry Reding8138d2d2012-03-26 08:42:48 +0200772 unsigned int match;
Hans de Goedeb526a312017-01-22 17:14:08 +0100773 int err;
Thierry Reding8138d2d2012-03-26 08:42:48 +0200774
Thierry Reding7299ab72011-12-14 11:10:32 +0100775 /* look up via DT first */
776 if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
Peter Ujfalusi8eb96122012-12-21 01:43:58 -0800777 return of_pwm_get(dev->of_node, con_id);
Thierry Reding7299ab72011-12-14 11:10:32 +0100778
Thierry Reding8138d2d2012-03-26 08:42:48 +0200779 /*
780 * We look up the provider in the static table typically provided by
781 * board setup code. We first try to lookup the consumer device by
782 * name. If the consumer device was passed in as NULL or if no match
783 * was found, we try to find the consumer by directly looking it up
784 * by name.
785 *
786 * If a match is found, the provider PWM chip is looked up by name
787 * and a PWM device is requested using the PWM device per-chip index.
788 *
789 * The lookup algorithm was shamelessly taken from the clock
790 * framework:
791 *
792 * We do slightly fuzzy matching here:
793 * An entry with a NULL ID is assumed to be a wildcard.
794 * If an entry has a device ID, it must match
795 * If an entry has a connection ID, it must match
796 * Then we take the most specific entry - with the following order
797 * of precedence: dev+con > dev only > con only.
798 */
799 mutex_lock(&pwm_lookup_lock);
800
801 list_for_each_entry(p, &pwm_lookup_list, list) {
802 match = 0;
803
804 if (p->dev_id) {
805 if (!dev_id || strcmp(p->dev_id, dev_id))
806 continue;
807
808 match += 2;
809 }
810
811 if (p->con_id) {
812 if (!con_id || strcmp(p->con_id, con_id))
813 continue;
814
815 match += 1;
816 }
817
818 if (match > best) {
Geert Uytterhoeven70145f82014-08-28 11:03:14 +0200819 chosen = p;
Thierry Reding8138d2d2012-03-26 08:42:48 +0200820
821 if (match != 3)
822 best = match;
823 else
824 break;
825 }
826 }
827
Hans de Goede69efb342017-01-22 17:14:07 +0100828 mutex_unlock(&pwm_lookup_lock);
829
830 if (!chosen)
831 return ERR_PTR(-ENODEV);
Alexandre Belloni3796ce12014-05-19 22:42:32 +0200832
Geert Uytterhoeven70145f82014-08-28 11:03:14 +0200833 chip = pwmchip_find_by_name(chosen->provider);
Hans de Goedeb526a312017-01-22 17:14:08 +0100834
835 /*
836 * If the lookup entry specifies a module, load the module and retry
837 * the PWM chip lookup. This can be used to work around driver load
838 * ordering issues if driver's can't be made to properly support the
839 * deferred probe mechanism.
840 */
841 if (!chip && chosen->module) {
842 err = request_module(chosen->module);
843 if (err == 0)
844 chip = pwmchip_find_by_name(chosen->provider);
845 }
846
Geert Uytterhoeven70145f82014-08-28 11:03:14 +0200847 if (!chip)
Hans de Goede69efb342017-01-22 17:14:07 +0100848 return ERR_PTR(-EPROBE_DEFER);
Geert Uytterhoeven70145f82014-08-28 11:03:14 +0200849
850 pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
Alexandre Belloni3796ce12014-05-19 22:42:32 +0200851 if (IS_ERR(pwm))
Hans de Goede69efb342017-01-22 17:14:07 +0100852 return pwm;
Thierry Reding8138d2d2012-03-26 08:42:48 +0200853
Boris Brezillonfbd45a12016-05-17 14:27:25 +0200854 pwm->args.period = chosen->period;
855 pwm->args.polarity = chosen->polarity;
856
Thierry Reding8138d2d2012-03-26 08:42:48 +0200857 return pwm;
858}
859EXPORT_SYMBOL_GPL(pwm_get);
860
861/**
862 * pwm_put() - release a PWM device
863 * @pwm: PWM device
864 */
865void pwm_put(struct pwm_device *pwm)
866{
867 if (!pwm)
868 return;
869
870 mutex_lock(&pwm_lock);
871
872 if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
Sachin Kamate50d3522012-08-10 16:41:13 +0530873 pr_warn("PWM device already freed\n");
Thierry Reding8138d2d2012-03-26 08:42:48 +0200874 goto out;
875 }
876
877 if (pwm->chip->ops->free)
878 pwm->chip->ops->free(pwm->chip, pwm);
879
Uwe Kleine-Könige926b122019-03-25 10:49:33 +0100880 pwm_set_chip_data(pwm, NULL);
Thierry Reding8138d2d2012-03-26 08:42:48 +0200881 pwm->label = NULL;
882
883 module_put(pwm->chip->ops->owner);
884out:
885 mutex_unlock(&pwm_lock);
886}
887EXPORT_SYMBOL_GPL(pwm_put);
888
Alexandre Courbot63543162012-08-01 19:20:58 +0900889static void devm_pwm_release(struct device *dev, void *res)
890{
891 pwm_put(*(struct pwm_device **)res);
892}
893
894/**
895 * devm_pwm_get() - resource managed pwm_get()
896 * @dev: device for PWM consumer
897 * @con_id: consumer name
898 *
899 * This function performs like pwm_get() but the acquired PWM device will
900 * automatically be released on driver detach.
Thierry Reding04883802015-07-27 11:58:32 +0200901 *
902 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
903 * error code on failure.
Alexandre Courbot63543162012-08-01 19:20:58 +0900904 */
905struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
906{
907 struct pwm_device **ptr, *pwm;
908
Wolfram Sang77f0b9d2013-06-03 22:27:17 +0200909 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
Alexandre Courbot63543162012-08-01 19:20:58 +0900910 if (!ptr)
911 return ERR_PTR(-ENOMEM);
912
913 pwm = pwm_get(dev, con_id);
914 if (!IS_ERR(pwm)) {
915 *ptr = pwm;
916 devres_add(dev, ptr);
917 } else {
918 devres_free(ptr);
919 }
920
921 return pwm;
922}
923EXPORT_SYMBOL_GPL(devm_pwm_get);
924
Peter Ujfalusi261a5ed2012-12-21 01:43:59 -0800925/**
926 * devm_of_pwm_get() - resource managed of_pwm_get()
927 * @dev: device for PWM consumer
928 * @np: device node to get the PWM from
929 * @con_id: consumer name
930 *
931 * This function performs like of_pwm_get() but the acquired PWM device will
932 * automatically be released on driver detach.
Thierry Reding04883802015-07-27 11:58:32 +0200933 *
934 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
935 * error code on failure.
Peter Ujfalusi261a5ed2012-12-21 01:43:59 -0800936 */
937struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
938 const char *con_id)
939{
940 struct pwm_device **ptr, *pwm;
941
Wolfram Sang77f0b9d2013-06-03 22:27:17 +0200942 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
Peter Ujfalusi261a5ed2012-12-21 01:43:59 -0800943 if (!ptr)
944 return ERR_PTR(-ENOMEM);
945
946 pwm = of_pwm_get(np, con_id);
947 if (!IS_ERR(pwm)) {
948 *ptr = pwm;
949 devres_add(dev, ptr);
950 } else {
951 devres_free(ptr);
952 }
953
954 return pwm;
955}
956EXPORT_SYMBOL_GPL(devm_of_pwm_get);
957
Alexandre Courbot63543162012-08-01 19:20:58 +0900958static int devm_pwm_match(struct device *dev, void *res, void *data)
959{
960 struct pwm_device **p = res;
961
962 if (WARN_ON(!p || !*p))
963 return 0;
964
965 return *p == data;
966}
967
968/**
969 * devm_pwm_put() - resource managed pwm_put()
970 * @dev: device for PWM consumer
971 * @pwm: PWM device
972 *
973 * Release a PWM previously allocated using devm_pwm_get(). Calling this
974 * function is usually not needed because devm-allocated resources are
975 * automatically released on driver detach.
976 */
977void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
978{
979 WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm));
980}
981EXPORT_SYMBOL_GPL(devm_pwm_put);
982
Thierry Reding62099ab2012-03-26 09:31:48 +0200983#ifdef CONFIG_DEBUG_FS
984static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
985{
986 unsigned int i;
987
988 for (i = 0; i < chip->npwm; i++) {
989 struct pwm_device *pwm = &chip->pwms[i];
Boris Brezillon39100ce2016-04-14 21:17:43 +0200990 struct pwm_state state;
991
992 pwm_get_state(pwm, &state);
Thierry Reding62099ab2012-03-26 09:31:48 +0200993
994 seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
995
996 if (test_bit(PWMF_REQUESTED, &pwm->flags))
Jingoo Hanadcba1e2013-12-19 13:31:24 +0900997 seq_puts(s, " requested");
Thierry Reding62099ab2012-03-26 09:31:48 +0200998
Boris Brezillon39100ce2016-04-14 21:17:43 +0200999 if (state.enabled)
Jingoo Hanadcba1e2013-12-19 13:31:24 +09001000 seq_puts(s, " enabled");
Thierry Reding62099ab2012-03-26 09:31:48 +02001001
Heiko Stübner23e35232016-04-14 21:17:44 +02001002 seq_printf(s, " period: %u ns", state.period);
1003 seq_printf(s, " duty: %u ns", state.duty_cycle);
1004 seq_printf(s, " polarity: %s",
1005 state.polarity ? "inverse" : "normal");
1006
Jingoo Hanadcba1e2013-12-19 13:31:24 +09001007 seq_puts(s, "\n");
Thierry Reding62099ab2012-03-26 09:31:48 +02001008 }
1009}
1010
1011static void *pwm_seq_start(struct seq_file *s, loff_t *pos)
1012{
1013 mutex_lock(&pwm_lock);
1014 s->private = "";
1015
1016 return seq_list_start(&pwm_chips, *pos);
1017}
1018
1019static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos)
1020{
1021 s->private = "\n";
1022
1023 return seq_list_next(v, &pwm_chips, pos);
1024}
1025
1026static void pwm_seq_stop(struct seq_file *s, void *v)
1027{
1028 mutex_unlock(&pwm_lock);
1029}
1030
1031static int pwm_seq_show(struct seq_file *s, void *v)
1032{
1033 struct pwm_chip *chip = list_entry(v, struct pwm_chip, list);
1034
1035 seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private,
1036 chip->dev->bus ? chip->dev->bus->name : "no-bus",
1037 dev_name(chip->dev), chip->npwm,
1038 (chip->npwm != 1) ? "s" : "");
1039
Uwe Kleine-Königcc2d2242019-01-07 20:49:39 +01001040 pwm_dbg_show(chip, s);
Thierry Reding62099ab2012-03-26 09:31:48 +02001041
1042 return 0;
1043}
1044
1045static const struct seq_operations pwm_seq_ops = {
1046 .start = pwm_seq_start,
1047 .next = pwm_seq_next,
1048 .stop = pwm_seq_stop,
1049 .show = pwm_seq_show,
1050};
1051
1052static int pwm_seq_open(struct inode *inode, struct file *file)
1053{
1054 return seq_open(file, &pwm_seq_ops);
1055}
1056
1057static const struct file_operations pwm_debugfs_ops = {
1058 .owner = THIS_MODULE,
1059 .open = pwm_seq_open,
1060 .read = seq_read,
1061 .llseek = seq_lseek,
1062 .release = seq_release,
1063};
1064
1065static int __init pwm_debugfs_init(void)
1066{
1067 debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL,
1068 &pwm_debugfs_ops);
1069
1070 return 0;
1071}
Thierry Reding62099ab2012-03-26 09:31:48 +02001072subsys_initcall(pwm_debugfs_init);
1073#endif /* CONFIG_DEBUG_FS */