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Jacek Anaszewski7aea8382015-01-09 07:22:51 -08001/*
2 * LED Flash class interface
3 *
4 * Copyright (C) 2015 Samsung Electronics Co., Ltd.
5 * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/device.h>
13#include <linux/init.h>
14#include <linux/led-class-flash.h>
15#include <linux/leds.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include "leds.h"
19
20#define has_flash_op(fled_cdev, op) \
21 (fled_cdev && fled_cdev->ops->op)
22
23#define call_flash_op(fled_cdev, op, args...) \
24 ((has_flash_op(fled_cdev, op)) ? \
25 (fled_cdev->ops->op(fled_cdev, args)) : \
26 -EINVAL)
27
28static const char * const led_flash_fault_names[] = {
29 "led-over-voltage",
30 "flash-timeout-exceeded",
31 "controller-over-temperature",
32 "controller-short-circuit",
33 "led-power-supply-over-current",
34 "indicator-led-fault",
35 "led-under-voltage",
36 "controller-under-voltage",
37 "led-over-temperature",
38};
39
40static ssize_t flash_brightness_store(struct device *dev,
41 struct device_attribute *attr, const char *buf, size_t size)
42{
43 struct led_classdev *led_cdev = dev_get_drvdata(dev);
44 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
45 unsigned long state;
46 ssize_t ret;
47
48 mutex_lock(&led_cdev->led_access);
49
50 if (led_sysfs_is_disabled(led_cdev)) {
51 ret = -EBUSY;
52 goto unlock;
53 }
54
55 ret = kstrtoul(buf, 10, &state);
56 if (ret)
57 goto unlock;
58
59 ret = led_set_flash_brightness(fled_cdev, state);
60 if (ret < 0)
61 goto unlock;
62
63 ret = size;
64unlock:
65 mutex_unlock(&led_cdev->led_access);
66 return ret;
67}
68
69static ssize_t flash_brightness_show(struct device *dev,
70 struct device_attribute *attr, char *buf)
71{
72 struct led_classdev *led_cdev = dev_get_drvdata(dev);
73 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
74
75 /* no lock needed for this */
76 led_update_flash_brightness(fled_cdev);
77
78 return sprintf(buf, "%u\n", fled_cdev->brightness.val);
79}
80static DEVICE_ATTR_RW(flash_brightness);
81
82static ssize_t max_flash_brightness_show(struct device *dev,
83 struct device_attribute *attr, char *buf)
84{
85 struct led_classdev *led_cdev = dev_get_drvdata(dev);
86 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
87
88 return sprintf(buf, "%u\n", fled_cdev->brightness.max);
89}
90static DEVICE_ATTR_RO(max_flash_brightness);
91
92static ssize_t flash_strobe_store(struct device *dev,
93 struct device_attribute *attr, const char *buf, size_t size)
94{
95 struct led_classdev *led_cdev = dev_get_drvdata(dev);
96 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
97 unsigned long state;
98 ssize_t ret = -EINVAL;
99
100 mutex_lock(&led_cdev->led_access);
101
102 if (led_sysfs_is_disabled(led_cdev)) {
103 ret = -EBUSY;
104 goto unlock;
105 }
106
107 ret = kstrtoul(buf, 10, &state);
108 if (ret)
109 goto unlock;
110
111 if (state < 0 || state > 1) {
112 ret = -EINVAL;
113 goto unlock;
114 }
115
116 ret = led_set_flash_strobe(fled_cdev, state);
117 if (ret < 0)
118 goto unlock;
119 ret = size;
120unlock:
121 mutex_unlock(&led_cdev->led_access);
122 return ret;
123}
124
125static ssize_t flash_strobe_show(struct device *dev,
126 struct device_attribute *attr, char *buf)
127{
128 struct led_classdev *led_cdev = dev_get_drvdata(dev);
129 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
130 bool state;
131 int ret;
132
133 /* no lock needed for this */
134 ret = led_get_flash_strobe(fled_cdev, &state);
135 if (ret < 0)
136 return ret;
137
138 return sprintf(buf, "%u\n", state);
139}
140static DEVICE_ATTR_RW(flash_strobe);
141
142static ssize_t flash_timeout_store(struct device *dev,
143 struct device_attribute *attr, const char *buf, size_t size)
144{
145 struct led_classdev *led_cdev = dev_get_drvdata(dev);
146 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
147 unsigned long flash_timeout;
148 ssize_t ret;
149
150 mutex_lock(&led_cdev->led_access);
151
152 if (led_sysfs_is_disabled(led_cdev)) {
153 ret = -EBUSY;
154 goto unlock;
155 }
156
157 ret = kstrtoul(buf, 10, &flash_timeout);
158 if (ret)
159 goto unlock;
160
161 ret = led_set_flash_timeout(fled_cdev, flash_timeout);
162 if (ret < 0)
163 goto unlock;
164
165 ret = size;
166unlock:
167 mutex_unlock(&led_cdev->led_access);
168 return ret;
169}
170
171static ssize_t flash_timeout_show(struct device *dev,
172 struct device_attribute *attr, char *buf)
173{
174 struct led_classdev *led_cdev = dev_get_drvdata(dev);
175 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
176
177 return sprintf(buf, "%u\n", fled_cdev->timeout.val);
178}
179static DEVICE_ATTR_RW(flash_timeout);
180
181static ssize_t max_flash_timeout_show(struct device *dev,
182 struct device_attribute *attr, char *buf)
183{
184 struct led_classdev *led_cdev = dev_get_drvdata(dev);
185 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
186
187 return sprintf(buf, "%u\n", fled_cdev->timeout.max);
188}
189static DEVICE_ATTR_RO(max_flash_timeout);
190
191static ssize_t flash_fault_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 struct led_classdev *led_cdev = dev_get_drvdata(dev);
195 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
196 u32 fault, mask = 0x1;
197 char *pbuf = buf;
198 int i, ret, buf_len;
199
200 ret = led_get_flash_fault(fled_cdev, &fault);
201 if (ret < 0)
202 return -EINVAL;
203
204 *buf = '\0';
205
206 for (i = 0; i < LED_NUM_FLASH_FAULTS; ++i) {
207 if (fault & mask) {
208 buf_len = sprintf(pbuf, "%s ",
209 led_flash_fault_names[i]);
210 pbuf += buf_len;
211 }
212 mask <<= 1;
213 }
214
215 return sprintf(buf, "%s\n", buf);
216}
217static DEVICE_ATTR_RO(flash_fault);
218
219static ssize_t available_sync_leds_show(struct device *dev,
220 struct device_attribute *attr, char *buf)
221{
222 struct led_classdev *led_cdev = dev_get_drvdata(dev);
223 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
224 char *pbuf = buf;
225 int i, buf_len;
226
227 buf_len = sprintf(pbuf, "[0: none] ");
228 pbuf += buf_len;
229
230 for (i = 0; i < fled_cdev->num_sync_leds; ++i) {
231 buf_len = sprintf(pbuf, "[%d: %s] ", i + 1,
232 fled_cdev->sync_leds[i]->led_cdev.name);
233 pbuf += buf_len;
234 }
235
236 return sprintf(buf, "%s\n", buf);
237}
238static DEVICE_ATTR_RO(available_sync_leds);
239
240static ssize_t flash_sync_strobe_store(struct device *dev,
241 struct device_attribute *attr, const char *buf, size_t size)
242{
243 struct led_classdev *led_cdev = dev_get_drvdata(dev);
244 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
245 unsigned long led_id;
246 ssize_t ret;
247
248 mutex_lock(&led_cdev->led_access);
249
250 if (led_sysfs_is_disabled(led_cdev)) {
251 ret = -EBUSY;
252 goto unlock;
253 }
254
255 ret = kstrtoul(buf, 10, &led_id);
256 if (ret)
257 goto unlock;
258
259 if (led_id > fled_cdev->num_sync_leds) {
260 ret = -ERANGE;
261 goto unlock;
262 }
263
264 fled_cdev->sync_led_id = led_id;
265
266 ret = size;
267unlock:
268 mutex_unlock(&led_cdev->led_access);
269 return ret;
270}
271
272static ssize_t flash_sync_strobe_show(struct device *dev,
273 struct device_attribute *attr, char *buf)
274{
275 struct led_classdev *led_cdev = dev_get_drvdata(dev);
276 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
277 int sled_id = fled_cdev->sync_led_id;
278 char *sync_led_name = "none";
279
280 if (fled_cdev->sync_led_id > 0)
281 sync_led_name = (char *)
282 fled_cdev->sync_leds[sled_id - 1]->led_cdev.name;
283
284 return sprintf(buf, "[%d: %s]\n", sled_id, sync_led_name);
285}
286static DEVICE_ATTR_RW(flash_sync_strobe);
287
288static struct attribute *led_flash_strobe_attrs[] = {
289 &dev_attr_flash_strobe.attr,
290 NULL,
291};
292
293static struct attribute *led_flash_timeout_attrs[] = {
294 &dev_attr_flash_timeout.attr,
295 &dev_attr_max_flash_timeout.attr,
296 NULL,
297};
298
299static struct attribute *led_flash_brightness_attrs[] = {
300 &dev_attr_flash_brightness.attr,
301 &dev_attr_max_flash_brightness.attr,
302 NULL,
303};
304
305static struct attribute *led_flash_fault_attrs[] = {
306 &dev_attr_flash_fault.attr,
307 NULL,
308};
309
310static struct attribute *led_flash_sync_strobe_attrs[] = {
311 &dev_attr_available_sync_leds.attr,
312 &dev_attr_flash_sync_strobe.attr,
313 NULL,
314};
315
316static const struct attribute_group led_flash_strobe_group = {
317 .attrs = led_flash_strobe_attrs,
318};
319
320static const struct attribute_group led_flash_timeout_group = {
321 .attrs = led_flash_timeout_attrs,
322};
323
324static const struct attribute_group led_flash_brightness_group = {
325 .attrs = led_flash_brightness_attrs,
326};
327
328static const struct attribute_group led_flash_fault_group = {
329 .attrs = led_flash_fault_attrs,
330};
331
332static const struct attribute_group led_flash_sync_strobe_group = {
333 .attrs = led_flash_sync_strobe_attrs,
334};
335
336static void led_flash_resume(struct led_classdev *led_cdev)
337{
338 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
339
340 call_flash_op(fled_cdev, flash_brightness_set,
341 fled_cdev->brightness.val);
342 call_flash_op(fled_cdev, timeout_set, fled_cdev->timeout.val);
343}
344
345static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev)
346{
347 struct led_classdev *led_cdev = &fled_cdev->led_cdev;
348 const struct led_flash_ops *ops = fled_cdev->ops;
349 const struct attribute_group **flash_groups = fled_cdev->sysfs_groups;
350
351 int num_sysfs_groups = 0;
352
353 flash_groups[num_sysfs_groups++] = &led_flash_strobe_group;
354
355 if (ops->flash_brightness_set)
356 flash_groups[num_sysfs_groups++] = &led_flash_brightness_group;
357
358 if (ops->timeout_set)
359 flash_groups[num_sysfs_groups++] = &led_flash_timeout_group;
360
361 if (ops->fault_get)
362 flash_groups[num_sysfs_groups++] = &led_flash_fault_group;
363
364 if (led_cdev->flags & LED_DEV_CAP_SYNC_STROBE)
365 flash_groups[num_sysfs_groups++] = &led_flash_sync_strobe_group;
366
367 led_cdev->groups = flash_groups;
368}
369
370int led_classdev_flash_register(struct device *parent,
371 struct led_classdev_flash *fled_cdev)
372{
373 struct led_classdev *led_cdev;
374 const struct led_flash_ops *ops;
375 int ret;
376
377 if (!fled_cdev)
378 return -EINVAL;
379
380 led_cdev = &fled_cdev->led_cdev;
381
382 if (led_cdev->flags & LED_DEV_CAP_FLASH) {
383 if (!led_cdev->brightness_set_sync)
384 return -EINVAL;
385
386 ops = fled_cdev->ops;
387 if (!ops || !ops->strobe_set)
388 return -EINVAL;
389
390 led_cdev->flash_resume = led_flash_resume;
391
392 /* Select the sysfs attributes to be created for the device */
393 led_flash_init_sysfs_groups(fled_cdev);
394 }
395
396 /* Register led class device */
397 ret = led_classdev_register(parent, led_cdev);
398 if (ret < 0)
399 return ret;
400
401 /* Setting a torch brightness needs to have immediate effect */
402 led_cdev->flags &= ~SET_BRIGHTNESS_ASYNC;
403 led_cdev->flags |= SET_BRIGHTNESS_SYNC;
404
405 return 0;
406}
407EXPORT_SYMBOL_GPL(led_classdev_flash_register);
408
409void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev)
410{
411 if (!fled_cdev)
412 return;
413
414 led_classdev_unregister(&fled_cdev->led_cdev);
415}
416EXPORT_SYMBOL_GPL(led_classdev_flash_unregister);
417
418static void led_clamp_align(struct led_flash_setting *s)
419{
420 u32 v, offset;
421
422 v = s->val + s->step / 2;
423 v = clamp(v, s->min, s->max);
424 offset = v - s->min;
425 offset = s->step * (offset / s->step);
426 s->val = s->min + offset;
427}
428
429int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout)
430{
431 struct led_classdev *led_cdev = &fled_cdev->led_cdev;
432 struct led_flash_setting *s = &fled_cdev->timeout;
433
434 s->val = timeout;
435 led_clamp_align(s);
436
437 if (!(led_cdev->flags & LED_SUSPENDED))
438 return call_flash_op(fled_cdev, timeout_set, s->val);
439
440 return 0;
441}
442EXPORT_SYMBOL_GPL(led_set_flash_timeout);
443
444int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault)
445{
446 return call_flash_op(fled_cdev, fault_get, fault);
447}
448EXPORT_SYMBOL_GPL(led_get_flash_fault);
449
450int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,
451 u32 brightness)
452{
453 struct led_classdev *led_cdev = &fled_cdev->led_cdev;
454 struct led_flash_setting *s = &fled_cdev->brightness;
455
456 s->val = brightness;
457 led_clamp_align(s);
458
459 if (!(led_cdev->flags & LED_SUSPENDED))
460 return call_flash_op(fled_cdev, flash_brightness_set, s->val);
461
462 return 0;
463}
464EXPORT_SYMBOL_GPL(led_set_flash_brightness);
465
466int led_update_flash_brightness(struct led_classdev_flash *fled_cdev)
467{
468 struct led_flash_setting *s = &fled_cdev->brightness;
469 u32 brightness;
470
471 if (has_flash_op(fled_cdev, flash_brightness_get)) {
472 int ret = call_flash_op(fled_cdev, flash_brightness_get,
473 &brightness);
474 if (ret < 0)
475 return ret;
476
477 s->val = brightness;
478 }
479
480 return 0;
481}
482EXPORT_SYMBOL_GPL(led_update_flash_brightness);
483
484MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
485MODULE_DESCRIPTION("LED Flash class interface");
486MODULE_LICENSE("GPL v2");