Commit | Line | Data |
---|---|---|
c72a1d60 RP |
1 | /* |
2 | * LED Class Core | |
3 | * | |
4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> | |
f8a7c6fe | 5 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
c72a1d60 RP |
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 | ||
04713306 JA |
12 | #include <linux/ctype.h> |
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
c72a1d60 | 15 | #include <linux/init.h> |
04713306 JA |
16 | #include <linux/kernel.h> |
17 | #include <linux/leds.h> | |
c72a1d60 | 18 | #include <linux/list.h> |
04713306 JA |
19 | #include <linux/module.h> |
20 | #include <linux/slab.h> | |
c72a1d60 | 21 | #include <linux/spinlock.h> |
9067359f | 22 | #include <linux/timer.h> |
eb1ce746 | 23 | #include <uapi/linux/uleds.h> |
c72a1d60 RP |
24 | #include "leds.h" |
25 | ||
26 | static struct class *leds_class; | |
27 | ||
5baa7503 | 28 | static ssize_t brightness_show(struct device *dev, |
f8a7c6fe | 29 | struct device_attribute *attr, char *buf) |
c72a1d60 | 30 | { |
f8a7c6fe | 31 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
32 | |
33 | /* no lock needed for this */ | |
29d76dfa | 34 | led_update_brightness(led_cdev); |
c72a1d60 | 35 | |
dd8e5a20 | 36 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
37 | } |
38 | ||
5baa7503 | 39 | static ssize_t brightness_store(struct device *dev, |
f8a7c6fe | 40 | struct device_attribute *attr, const char *buf, size_t size) |
c72a1d60 | 41 | { |
f8a7c6fe | 42 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be | 43 | unsigned long state; |
acd899e4 JA |
44 | ssize_t ret; |
45 | ||
46 | mutex_lock(&led_cdev->led_access); | |
47 | ||
48 | if (led_sysfs_is_disabled(led_cdev)) { | |
49 | ret = -EBUSY; | |
50 | goto unlock; | |
51 | } | |
c72a1d60 | 52 | |
872b86be SK |
53 | ret = kstrtoul(buf, 10, &state); |
54 | if (ret) | |
acd899e4 | 55 | goto unlock; |
3dc7b82e | 56 | |
872b86be SK |
57 | if (state == LED_OFF) |
58 | led_trigger_remove(led_cdev); | |
4d71a4a1 | 59 | led_set_brightness(led_cdev, state); |
0db37915 | 60 | flush_work(&led_cdev->set_brightness_work); |
0013b23d | 61 | |
acd899e4 JA |
62 | ret = size; |
63 | unlock: | |
64 | mutex_unlock(&led_cdev->led_access); | |
65 | return ret; | |
c72a1d60 | 66 | } |
5baa7503 | 67 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 68 | |
38419612 | 69 | static ssize_t max_brightness_show(struct device *dev, |
1bd465e6 GL |
70 | struct device_attribute *attr, char *buf) |
71 | { | |
72 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
73 | ||
74 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
75 | } | |
38419612 | 76 | static DEVICE_ATTR_RO(max_brightness); |
1bd465e6 | 77 | |
c3bc9956 | 78 | #ifdef CONFIG_LEDS_TRIGGERS |
5baa7503 GKH |
79 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
80 | static struct attribute *led_trigger_attrs[] = { | |
81 | &dev_attr_trigger.attr, | |
82 | NULL, | |
83 | }; | |
84 | static const struct attribute_group led_trigger_group = { | |
85 | .attrs = led_trigger_attrs, | |
86 | }; | |
87 | #endif | |
88 | ||
89 | static struct attribute *led_class_attrs[] = { | |
90 | &dev_attr_brightness.attr, | |
91 | &dev_attr_max_brightness.attr, | |
92 | NULL, | |
93 | }; | |
94 | ||
95 | static const struct attribute_group led_group = { | |
96 | .attrs = led_class_attrs, | |
97 | }; | |
98 | ||
99 | static const struct attribute_group *led_groups[] = { | |
100 | &led_group, | |
101 | #ifdef CONFIG_LEDS_TRIGGERS | |
102 | &led_trigger_group, | |
c3bc9956 | 103 | #endif |
5baa7503 | 104 | NULL, |
14b5d6dd | 105 | }; |
c72a1d60 | 106 | |
0cb8eb30 HG |
107 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED |
108 | static ssize_t brightness_hw_changed_show(struct device *dev, | |
109 | struct device_attribute *attr, char *buf) | |
110 | { | |
111 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
112 | ||
113 | if (led_cdev->brightness_hw_changed == -1) | |
114 | return -ENODATA; | |
115 | ||
116 | return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed); | |
117 | } | |
118 | ||
119 | static DEVICE_ATTR_RO(brightness_hw_changed); | |
120 | ||
121 | static int led_add_brightness_hw_changed(struct led_classdev *led_cdev) | |
122 | { | |
123 | struct device *dev = led_cdev->dev; | |
124 | int ret; | |
125 | ||
126 | ret = device_create_file(dev, &dev_attr_brightness_hw_changed); | |
127 | if (ret) { | |
128 | dev_err(dev, "Error creating brightness_hw_changed\n"); | |
129 | return ret; | |
130 | } | |
131 | ||
132 | led_cdev->brightness_hw_changed_kn = | |
133 | sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed"); | |
134 | if (!led_cdev->brightness_hw_changed_kn) { | |
135 | dev_err(dev, "Error getting brightness_hw_changed kn\n"); | |
136 | device_remove_file(dev, &dev_attr_brightness_hw_changed); | |
137 | return -ENXIO; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev) | |
144 | { | |
145 | sysfs_put(led_cdev->brightness_hw_changed_kn); | |
146 | device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed); | |
147 | } | |
148 | ||
149 | void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev, | |
150 | enum led_brightness brightness) | |
151 | { | |
152 | if (WARN_ON(!led_cdev->brightness_hw_changed_kn)) | |
153 | return; | |
154 | ||
155 | led_cdev->brightness_hw_changed = brightness; | |
156 | sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn); | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed); | |
159 | #else | |
160 | static int led_add_brightness_hw_changed(struct led_classdev *led_cdev) | |
161 | { | |
162 | return 0; | |
163 | } | |
164 | static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev) | |
165 | { | |
166 | } | |
167 | #endif | |
168 | ||
c72a1d60 RP |
169 | /** |
170 | * led_classdev_suspend - suspend an led_classdev. | |
171 | * @led_cdev: the led_classdev to suspend. | |
172 | */ | |
173 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
174 | { | |
175 | led_cdev->flags |= LED_SUSPENDED; | |
81fe8e5b | 176 | led_set_brightness_nopm(led_cdev, 0); |
c72a1d60 RP |
177 | } |
178 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
179 | ||
180 | /** | |
181 | * led_classdev_resume - resume an led_classdev. | |
182 | * @led_cdev: the led_classdev to resume. | |
183 | */ | |
184 | void led_classdev_resume(struct led_classdev *led_cdev) | |
185 | { | |
81fe8e5b | 186 | led_set_brightness_nopm(led_cdev, led_cdev->brightness); |
7aea8389 JA |
187 | |
188 | if (led_cdev->flash_resume) | |
189 | led_cdev->flash_resume(led_cdev); | |
190 | ||
c72a1d60 RP |
191 | led_cdev->flags &= ~LED_SUSPENDED; |
192 | } | |
193 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
194 | ||
084609bf | 195 | #ifdef CONFIG_PM_SLEEP |
73e1ab41 | 196 | static int led_suspend(struct device *dev) |
859cb7f2 RP |
197 | { |
198 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
199 | ||
200 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
201 | led_classdev_suspend(led_cdev); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static int led_resume(struct device *dev) | |
207 | { | |
208 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
209 | ||
210 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
211 | led_classdev_resume(led_cdev); | |
212 | ||
213 | return 0; | |
214 | } | |
084609bf | 215 | #endif |
859cb7f2 | 216 | |
084609bf | 217 | static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume); |
73e1ab41 | 218 | |
a96aa64c RRD |
219 | static int match_name(struct device *dev, const void *data) |
220 | { | |
221 | if (!dev_name(dev)) | |
222 | return 0; | |
223 | return !strcmp(dev_name(dev), (char *)data); | |
224 | } | |
225 | ||
226 | static int led_classdev_next_name(const char *init_name, char *name, | |
227 | size_t len) | |
228 | { | |
229 | unsigned int i = 0; | |
230 | int ret = 0; | |
e5b5a61f | 231 | struct device *dev; |
a96aa64c RRD |
232 | |
233 | strlcpy(name, init_name, len); | |
234 | ||
e5b5a61f RRD |
235 | while ((ret < len) && |
236 | (dev = class_find_device(leds_class, NULL, name, match_name))) { | |
237 | put_device(dev); | |
a96aa64c | 238 | ret = snprintf(name, len, "%s_%u", init_name, ++i); |
e5b5a61f | 239 | } |
a96aa64c RRD |
240 | |
241 | if (ret >= len) | |
242 | return -ENOMEM; | |
243 | ||
244 | return i; | |
245 | } | |
246 | ||
c72a1d60 | 247 | /** |
442c6098 RM |
248 | * of_led_classdev_register - register a new object of led_classdev class. |
249 | * | |
250 | * @parent: parent of LED device | |
c72a1d60 | 251 | * @led_cdev: the led_classdev structure for this device. |
442c6098 | 252 | * @np: DT node describing this LED |
c72a1d60 | 253 | */ |
442c6098 RM |
254 | int of_led_classdev_register(struct device *parent, struct device_node *np, |
255 | struct led_classdev *led_cdev) | |
c72a1d60 | 256 | { |
eb1ce746 | 257 | char name[LED_MAX_NAME_SIZE]; |
a96aa64c RRD |
258 | int ret; |
259 | ||
260 | ret = led_classdev_next_name(led_cdev->name, name, sizeof(name)); | |
261 | if (ret < 0) | |
262 | return ret; | |
263 | ||
6d71021a LH |
264 | mutex_init(&led_cdev->led_access); |
265 | mutex_lock(&led_cdev->led_access); | |
d0d480cc | 266 | led_cdev->dev = device_create_with_groups(leds_class, parent, 0, |
ccdc4507 | 267 | led_cdev, led_cdev->groups, "%s", name); |
6d71021a LH |
268 | if (IS_ERR(led_cdev->dev)) { |
269 | mutex_unlock(&led_cdev->led_access); | |
f8a7c6fe | 270 | return PTR_ERR(led_cdev->dev); |
6d71021a | 271 | } |
442c6098 | 272 | led_cdev->dev->of_node = np; |
c72a1d60 | 273 | |
a96aa64c | 274 | if (ret) |
6f06c7f8 | 275 | dev_warn(parent, "Led %s renamed to %s due to name collision", |
a96aa64c RRD |
276 | led_cdev->name, dev_name(led_cdev->dev)); |
277 | ||
0cb8eb30 HG |
278 | if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) { |
279 | ret = led_add_brightness_hw_changed(led_cdev); | |
280 | if (ret) { | |
281 | device_unregister(led_cdev->dev); | |
6d71021a | 282 | mutex_unlock(&led_cdev->led_access); |
0cb8eb30 HG |
283 | return ret; |
284 | } | |
285 | } | |
286 | ||
a9c6ce57 | 287 | led_cdev->work_flags = 0; |
270c3957 RP |
288 | #ifdef CONFIG_LEDS_TRIGGERS |
289 | init_rwsem(&led_cdev->trigger_lock); | |
0cb8eb30 HG |
290 | #endif |
291 | #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED | |
292 | led_cdev->brightness_hw_changed = -1; | |
270c3957 | 293 | #endif |
c72a1d60 | 294 | /* add to the list of leds */ |
72f8da32 | 295 | down_write(&leds_list_lock); |
c72a1d60 | 296 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 297 | up_write(&leds_list_lock); |
c72a1d60 | 298 | |
1bd465e6 GL |
299 | if (!led_cdev->max_brightness) |
300 | led_cdev->max_brightness = LED_FULL; | |
301 | ||
29d76dfa HMH |
302 | led_update_brightness(led_cdev); |
303 | ||
757b06ae | 304 | led_init_core(led_cdev); |
5ada28bf | 305 | |
c3bc9956 | 306 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 307 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
308 | #endif |
309 | ||
6d71021a LH |
310 | mutex_unlock(&led_cdev->led_access); |
311 | ||
d23e7b8b | 312 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 313 | led_cdev->name); |
c72a1d60 RP |
314 | |
315 | return 0; | |
316 | } | |
442c6098 | 317 | EXPORT_SYMBOL_GPL(of_led_classdev_register); |
c72a1d60 RP |
318 | |
319 | /** | |
0266a458 | 320 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 321 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
322 | * |
323 | * Unregisters a previously registered via led_classdev_register object. | |
324 | */ | |
b844eba2 | 325 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 326 | { |
c3bc9956 | 327 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 328 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
329 | if (led_cdev->trigger) |
330 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 331 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 332 | #endif |
c72a1d60 | 333 | |
d84d80f3 HK |
334 | led_cdev->flags |= LED_UNREGISTERING; |
335 | ||
5ada28bf | 336 | /* Stop blinking */ |
d23a22a7 | 337 | led_stop_software_blink(led_cdev); |
d1aa577f | 338 | |
19cd67e2 | 339 | led_set_brightness(led_cdev, LED_OFF); |
5ada28bf | 340 | |
d1aa577f MK |
341 | flush_work(&led_cdev->set_brightness_work); |
342 | ||
0cb8eb30 HG |
343 | if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) |
344 | led_remove_brightness_hw_changed(led_cdev); | |
345 | ||
b844eba2 | 346 | device_unregister(led_cdev->dev); |
c72a1d60 | 347 | |
72f8da32 | 348 | down_write(&leds_list_lock); |
c72a1d60 | 349 | list_del(&led_cdev->node); |
72f8da32 | 350 | up_write(&leds_list_lock); |
acd899e4 JA |
351 | |
352 | mutex_destroy(&led_cdev->led_access); | |
c72a1d60 | 353 | } |
b844eba2 | 354 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 | 355 | |
ca1bb4ee BA |
356 | static void devm_led_classdev_release(struct device *dev, void *res) |
357 | { | |
358 | led_classdev_unregister(*(struct led_classdev **)res); | |
359 | } | |
360 | ||
361 | /** | |
442c6098 RM |
362 | * devm_of_led_classdev_register - resource managed led_classdev_register() |
363 | * | |
364 | * @parent: parent of LED device | |
ca1bb4ee BA |
365 | * @led_cdev: the led_classdev structure for this device. |
366 | */ | |
442c6098 RM |
367 | int devm_of_led_classdev_register(struct device *parent, |
368 | struct device_node *np, | |
369 | struct led_classdev *led_cdev) | |
ca1bb4ee BA |
370 | { |
371 | struct led_classdev **dr; | |
372 | int rc; | |
373 | ||
374 | dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL); | |
375 | if (!dr) | |
376 | return -ENOMEM; | |
377 | ||
442c6098 | 378 | rc = of_led_classdev_register(parent, np, led_cdev); |
ca1bb4ee BA |
379 | if (rc) { |
380 | devres_free(dr); | |
381 | return rc; | |
382 | } | |
383 | ||
384 | *dr = led_cdev; | |
385 | devres_add(parent, dr); | |
386 | ||
387 | return 0; | |
388 | } | |
442c6098 | 389 | EXPORT_SYMBOL_GPL(devm_of_led_classdev_register); |
ca1bb4ee BA |
390 | |
391 | static int devm_led_classdev_match(struct device *dev, void *res, void *data) | |
392 | { | |
393 | struct led_cdev **p = res; | |
394 | ||
395 | if (WARN_ON(!p || !*p)) | |
396 | return 0; | |
397 | ||
398 | return *p == data; | |
399 | } | |
400 | ||
401 | /** | |
402 | * devm_led_classdev_unregister() - resource managed led_classdev_unregister() | |
403 | * @parent: The device to unregister. | |
404 | * @led_cdev: the led_classdev structure for this device. | |
405 | */ | |
406 | void devm_led_classdev_unregister(struct device *dev, | |
407 | struct led_classdev *led_cdev) | |
408 | { | |
409 | WARN_ON(devres_release(dev, | |
410 | devm_led_classdev_release, | |
411 | devm_led_classdev_match, led_cdev)); | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(devm_led_classdev_unregister); | |
414 | ||
c72a1d60 RP |
415 | static int __init leds_init(void) |
416 | { | |
417 | leds_class = class_create(THIS_MODULE, "leds"); | |
418 | if (IS_ERR(leds_class)) | |
419 | return PTR_ERR(leds_class); | |
73e1ab41 | 420 | leds_class->pm = &leds_class_dev_pm_ops; |
5baa7503 | 421 | leds_class->dev_groups = led_groups; |
c72a1d60 RP |
422 | return 0; |
423 | } | |
424 | ||
425 | static void __exit leds_exit(void) | |
426 | { | |
427 | class_destroy(leds_class); | |
428 | } | |
429 | ||
430 | subsys_initcall(leds_init); | |
431 | module_exit(leds_exit); | |
432 | ||
433 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
434 | MODULE_LICENSE("GPL"); | |
435 | MODULE_DESCRIPTION("LED Class Interface"); |