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7aea8389 JA |
1 | /* |
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 | ||
28 | static 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 | ||
40 | static 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; | |
64 | unlock: | |
65 | mutex_unlock(&led_cdev->led_access); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | static 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 | } | |
80 | static DEVICE_ATTR_RW(flash_brightness); | |
81 | ||
82 | static 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 | } | |
90 | static DEVICE_ATTR_RO(max_flash_brightness); | |
91 | ||
92 | static 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 | ||
abc19635 | 111 | if (state > 1) { |
7aea8389 JA |
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; | |
120 | unlock: | |
121 | mutex_unlock(&led_cdev->led_access); | |
122 | return ret; | |
123 | } | |
124 | ||
125 | static 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 | } | |
140 | static DEVICE_ATTR_RW(flash_strobe); | |
141 | ||
142 | static 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; | |
166 | unlock: | |
167 | mutex_unlock(&led_cdev->led_access); | |
168 | return ret; | |
169 | } | |
170 | ||
171 | static 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 | } | |
179 | static DEVICE_ATTR_RW(flash_timeout); | |
180 | ||
181 | static 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 | } | |
189 | static DEVICE_ATTR_RO(max_flash_timeout); | |
190 | ||
191 | static 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 | } | |
217 | static DEVICE_ATTR_RO(flash_fault); | |
218 | ||
7aea8389 JA |
219 | static struct attribute *led_flash_strobe_attrs[] = { |
220 | &dev_attr_flash_strobe.attr, | |
221 | NULL, | |
222 | }; | |
223 | ||
224 | static struct attribute *led_flash_timeout_attrs[] = { | |
225 | &dev_attr_flash_timeout.attr, | |
226 | &dev_attr_max_flash_timeout.attr, | |
227 | NULL, | |
228 | }; | |
229 | ||
230 | static struct attribute *led_flash_brightness_attrs[] = { | |
231 | &dev_attr_flash_brightness.attr, | |
232 | &dev_attr_max_flash_brightness.attr, | |
233 | NULL, | |
234 | }; | |
235 | ||
236 | static struct attribute *led_flash_fault_attrs[] = { | |
237 | &dev_attr_flash_fault.attr, | |
238 | NULL, | |
239 | }; | |
240 | ||
7aea8389 JA |
241 | static const struct attribute_group led_flash_strobe_group = { |
242 | .attrs = led_flash_strobe_attrs, | |
243 | }; | |
244 | ||
245 | static const struct attribute_group led_flash_timeout_group = { | |
246 | .attrs = led_flash_timeout_attrs, | |
247 | }; | |
248 | ||
249 | static const struct attribute_group led_flash_brightness_group = { | |
250 | .attrs = led_flash_brightness_attrs, | |
251 | }; | |
252 | ||
253 | static const struct attribute_group led_flash_fault_group = { | |
254 | .attrs = led_flash_fault_attrs, | |
255 | }; | |
256 | ||
7aea8389 JA |
257 | static void led_flash_resume(struct led_classdev *led_cdev) |
258 | { | |
259 | struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); | |
260 | ||
261 | call_flash_op(fled_cdev, flash_brightness_set, | |
262 | fled_cdev->brightness.val); | |
263 | call_flash_op(fled_cdev, timeout_set, fled_cdev->timeout.val); | |
264 | } | |
265 | ||
266 | static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev) | |
267 | { | |
268 | struct led_classdev *led_cdev = &fled_cdev->led_cdev; | |
269 | const struct led_flash_ops *ops = fled_cdev->ops; | |
270 | const struct attribute_group **flash_groups = fled_cdev->sysfs_groups; | |
271 | ||
272 | int num_sysfs_groups = 0; | |
273 | ||
274 | flash_groups[num_sysfs_groups++] = &led_flash_strobe_group; | |
275 | ||
276 | if (ops->flash_brightness_set) | |
277 | flash_groups[num_sysfs_groups++] = &led_flash_brightness_group; | |
278 | ||
279 | if (ops->timeout_set) | |
280 | flash_groups[num_sysfs_groups++] = &led_flash_timeout_group; | |
281 | ||
282 | if (ops->fault_get) | |
283 | flash_groups[num_sysfs_groups++] = &led_flash_fault_group; | |
284 | ||
7aea8389 JA |
285 | led_cdev->groups = flash_groups; |
286 | } | |
287 | ||
288 | int led_classdev_flash_register(struct device *parent, | |
289 | struct led_classdev_flash *fled_cdev) | |
290 | { | |
291 | struct led_classdev *led_cdev; | |
292 | const struct led_flash_ops *ops; | |
293 | int ret; | |
294 | ||
295 | if (!fled_cdev) | |
296 | return -EINVAL; | |
297 | ||
298 | led_cdev = &fled_cdev->led_cdev; | |
299 | ||
300 | if (led_cdev->flags & LED_DEV_CAP_FLASH) { | |
437a4240 | 301 | if (!led_cdev->brightness_set_blocking) |
7aea8389 JA |
302 | return -EINVAL; |
303 | ||
304 | ops = fled_cdev->ops; | |
305 | if (!ops || !ops->strobe_set) | |
306 | return -EINVAL; | |
307 | ||
308 | led_cdev->flash_resume = led_flash_resume; | |
309 | ||
310 | /* Select the sysfs attributes to be created for the device */ | |
311 | led_flash_init_sysfs_groups(fled_cdev); | |
312 | } | |
313 | ||
314 | /* Register led class device */ | |
315 | ret = led_classdev_register(parent, led_cdev); | |
316 | if (ret < 0) | |
317 | return ret; | |
318 | ||
7aea8389 JA |
319 | return 0; |
320 | } | |
321 | EXPORT_SYMBOL_GPL(led_classdev_flash_register); | |
322 | ||
323 | void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev) | |
324 | { | |
325 | if (!fled_cdev) | |
326 | return; | |
327 | ||
328 | led_classdev_unregister(&fled_cdev->led_cdev); | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(led_classdev_flash_unregister); | |
331 | ||
332 | static void led_clamp_align(struct led_flash_setting *s) | |
333 | { | |
334 | u32 v, offset; | |
335 | ||
336 | v = s->val + s->step / 2; | |
337 | v = clamp(v, s->min, s->max); | |
338 | offset = v - s->min; | |
339 | offset = s->step * (offset / s->step); | |
340 | s->val = s->min + offset; | |
341 | } | |
342 | ||
343 | int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout) | |
344 | { | |
345 | struct led_classdev *led_cdev = &fled_cdev->led_cdev; | |
346 | struct led_flash_setting *s = &fled_cdev->timeout; | |
347 | ||
348 | s->val = timeout; | |
349 | led_clamp_align(s); | |
350 | ||
351 | if (!(led_cdev->flags & LED_SUSPENDED)) | |
352 | return call_flash_op(fled_cdev, timeout_set, s->val); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(led_set_flash_timeout); | |
357 | ||
358 | int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault) | |
359 | { | |
360 | return call_flash_op(fled_cdev, fault_get, fault); | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(led_get_flash_fault); | |
363 | ||
364 | int led_set_flash_brightness(struct led_classdev_flash *fled_cdev, | |
365 | u32 brightness) | |
366 | { | |
367 | struct led_classdev *led_cdev = &fled_cdev->led_cdev; | |
368 | struct led_flash_setting *s = &fled_cdev->brightness; | |
369 | ||
370 | s->val = brightness; | |
371 | led_clamp_align(s); | |
372 | ||
373 | if (!(led_cdev->flags & LED_SUSPENDED)) | |
374 | return call_flash_op(fled_cdev, flash_brightness_set, s->val); | |
375 | ||
376 | return 0; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(led_set_flash_brightness); | |
379 | ||
380 | int led_update_flash_brightness(struct led_classdev_flash *fled_cdev) | |
381 | { | |
382 | struct led_flash_setting *s = &fled_cdev->brightness; | |
383 | u32 brightness; | |
384 | ||
385 | if (has_flash_op(fled_cdev, flash_brightness_get)) { | |
386 | int ret = call_flash_op(fled_cdev, flash_brightness_get, | |
387 | &brightness); | |
388 | if (ret < 0) | |
389 | return ret; | |
390 | ||
391 | s->val = brightness; | |
392 | } | |
393 | ||
394 | return 0; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(led_update_flash_brightness); | |
397 | ||
398 | MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>"); | |
399 | MODULE_DESCRIPTION("LED Flash class interface"); | |
400 | MODULE_LICENSE("GPL v2"); |