Commit | Line | Data |
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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> |
c72a1d60 RP |
23 | #include "leds.h" |
24 | ||
25 | static struct class *leds_class; | |
26 | ||
5baa7503 | 27 | static ssize_t brightness_show(struct device *dev, |
f8a7c6fe | 28 | struct device_attribute *attr, char *buf) |
c72a1d60 | 29 | { |
f8a7c6fe | 30 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
31 | |
32 | /* no lock needed for this */ | |
29d76dfa | 33 | led_update_brightness(led_cdev); |
c72a1d60 | 34 | |
dd8e5a20 | 35 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
36 | } |
37 | ||
5baa7503 | 38 | static ssize_t brightness_store(struct device *dev, |
f8a7c6fe | 39 | struct device_attribute *attr, const char *buf, size_t size) |
c72a1d60 | 40 | { |
f8a7c6fe | 41 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be | 42 | unsigned long state; |
acd899e4 JA |
43 | ssize_t ret; |
44 | ||
45 | mutex_lock(&led_cdev->led_access); | |
46 | ||
47 | if (led_sysfs_is_disabled(led_cdev)) { | |
48 | ret = -EBUSY; | |
49 | goto unlock; | |
50 | } | |
c72a1d60 | 51 | |
872b86be SK |
52 | ret = kstrtoul(buf, 10, &state); |
53 | if (ret) | |
acd899e4 | 54 | goto unlock; |
3dc7b82e | 55 | |
872b86be SK |
56 | if (state == LED_OFF) |
57 | led_trigger_remove(led_cdev); | |
4d71a4a1 | 58 | led_set_brightness(led_cdev, state); |
0013b23d | 59 | |
acd899e4 JA |
60 | ret = size; |
61 | unlock: | |
62 | mutex_unlock(&led_cdev->led_access); | |
63 | return ret; | |
c72a1d60 | 64 | } |
5baa7503 | 65 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 66 | |
38419612 | 67 | static ssize_t max_brightness_show(struct device *dev, |
1bd465e6 GL |
68 | struct device_attribute *attr, char *buf) |
69 | { | |
70 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
71 | ||
72 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
73 | } | |
38419612 | 74 | static DEVICE_ATTR_RO(max_brightness); |
1bd465e6 | 75 | |
c3bc9956 | 76 | #ifdef CONFIG_LEDS_TRIGGERS |
5baa7503 GKH |
77 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
78 | static struct attribute *led_trigger_attrs[] = { | |
79 | &dev_attr_trigger.attr, | |
80 | NULL, | |
81 | }; | |
82 | static const struct attribute_group led_trigger_group = { | |
83 | .attrs = led_trigger_attrs, | |
84 | }; | |
85 | #endif | |
86 | ||
87 | static struct attribute *led_class_attrs[] = { | |
88 | &dev_attr_brightness.attr, | |
89 | &dev_attr_max_brightness.attr, | |
90 | NULL, | |
91 | }; | |
92 | ||
93 | static const struct attribute_group led_group = { | |
94 | .attrs = led_class_attrs, | |
95 | }; | |
96 | ||
97 | static const struct attribute_group *led_groups[] = { | |
98 | &led_group, | |
99 | #ifdef CONFIG_LEDS_TRIGGERS | |
100 | &led_trigger_group, | |
c3bc9956 | 101 | #endif |
5baa7503 | 102 | NULL, |
14b5d6dd | 103 | }; |
c72a1d60 RP |
104 | |
105 | /** | |
106 | * led_classdev_suspend - suspend an led_classdev. | |
107 | * @led_cdev: the led_classdev to suspend. | |
108 | */ | |
109 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
110 | { | |
111 | led_cdev->flags |= LED_SUSPENDED; | |
112 | led_cdev->brightness_set(led_cdev, 0); | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
115 | ||
116 | /** | |
117 | * led_classdev_resume - resume an led_classdev. | |
118 | * @led_cdev: the led_classdev to resume. | |
119 | */ | |
120 | void led_classdev_resume(struct led_classdev *led_cdev) | |
121 | { | |
122 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
7aea8389 JA |
123 | |
124 | if (led_cdev->flash_resume) | |
125 | led_cdev->flash_resume(led_cdev); | |
126 | ||
c72a1d60 RP |
127 | led_cdev->flags &= ~LED_SUSPENDED; |
128 | } | |
129 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
130 | ||
084609bf | 131 | #ifdef CONFIG_PM_SLEEP |
73e1ab41 | 132 | static int led_suspend(struct device *dev) |
859cb7f2 RP |
133 | { |
134 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
135 | ||
136 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
137 | led_classdev_suspend(led_cdev); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int led_resume(struct device *dev) | |
143 | { | |
144 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
145 | ||
146 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
147 | led_classdev_resume(led_cdev); | |
148 | ||
149 | return 0; | |
150 | } | |
084609bf | 151 | #endif |
859cb7f2 | 152 | |
084609bf | 153 | static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume); |
73e1ab41 | 154 | |
a96aa64c RRD |
155 | static int match_name(struct device *dev, const void *data) |
156 | { | |
157 | if (!dev_name(dev)) | |
158 | return 0; | |
159 | return !strcmp(dev_name(dev), (char *)data); | |
160 | } | |
161 | ||
162 | static int led_classdev_next_name(const char *init_name, char *name, | |
163 | size_t len) | |
164 | { | |
165 | unsigned int i = 0; | |
166 | int ret = 0; | |
e5b5a61f | 167 | struct device *dev; |
a96aa64c RRD |
168 | |
169 | strlcpy(name, init_name, len); | |
170 | ||
e5b5a61f RRD |
171 | while ((ret < len) && |
172 | (dev = class_find_device(leds_class, NULL, name, match_name))) { | |
173 | put_device(dev); | |
a96aa64c | 174 | ret = snprintf(name, len, "%s_%u", init_name, ++i); |
e5b5a61f | 175 | } |
a96aa64c RRD |
176 | |
177 | if (ret >= len) | |
178 | return -ENOMEM; | |
179 | ||
180 | return i; | |
181 | } | |
182 | ||
c72a1d60 RP |
183 | /** |
184 | * led_classdev_register - register a new object of led_classdev class. | |
ff8649af | 185 | * @parent: The device to register. |
c72a1d60 RP |
186 | * @led_cdev: the led_classdev structure for this device. |
187 | */ | |
188 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
189 | { | |
a96aa64c RRD |
190 | char name[64]; |
191 | int ret; | |
192 | ||
193 | ret = led_classdev_next_name(led_cdev->name, name, sizeof(name)); | |
194 | if (ret < 0) | |
195 | return ret; | |
196 | ||
d0d480cc | 197 | led_cdev->dev = device_create_with_groups(leds_class, parent, 0, |
ccdc4507 | 198 | led_cdev, led_cdev->groups, "%s", name); |
801678c5 | 199 | if (IS_ERR(led_cdev->dev)) |
f8a7c6fe | 200 | return PTR_ERR(led_cdev->dev); |
c72a1d60 | 201 | |
a96aa64c | 202 | if (ret) |
6f06c7f8 | 203 | dev_warn(parent, "Led %s renamed to %s due to name collision", |
a96aa64c RRD |
204 | led_cdev->name, dev_name(led_cdev->dev)); |
205 | ||
270c3957 RP |
206 | #ifdef CONFIG_LEDS_TRIGGERS |
207 | init_rwsem(&led_cdev->trigger_lock); | |
208 | #endif | |
acd899e4 | 209 | mutex_init(&led_cdev->led_access); |
c72a1d60 | 210 | /* add to the list of leds */ |
72f8da32 | 211 | down_write(&leds_list_lock); |
c72a1d60 | 212 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 213 | up_write(&leds_list_lock); |
c72a1d60 | 214 | |
1bd465e6 GL |
215 | if (!led_cdev->max_brightness) |
216 | led_cdev->max_brightness = LED_FULL; | |
217 | ||
4d71a4a1 JA |
218 | led_cdev->flags |= SET_BRIGHTNESS_ASYNC; |
219 | ||
29d76dfa HMH |
220 | led_update_brightness(led_cdev); |
221 | ||
757b06ae | 222 | led_init_core(led_cdev); |
5ada28bf | 223 | |
c3bc9956 | 224 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 225 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
226 | #endif |
227 | ||
d23e7b8b | 228 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 229 | led_cdev->name); |
c72a1d60 RP |
230 | |
231 | return 0; | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
234 | ||
235 | /** | |
0266a458 | 236 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 237 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
238 | * |
239 | * Unregisters a previously registered via led_classdev_register object. | |
240 | */ | |
b844eba2 | 241 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 242 | { |
c3bc9956 | 243 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 244 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
245 | if (led_cdev->trigger) |
246 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 247 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 248 | #endif |
c72a1d60 | 249 | |
d23a22a7 FB |
250 | cancel_work_sync(&led_cdev->set_brightness_work); |
251 | ||
5ada28bf | 252 | /* Stop blinking */ |
d23a22a7 | 253 | led_stop_software_blink(led_cdev); |
19cd67e2 | 254 | led_set_brightness(led_cdev, LED_OFF); |
5ada28bf | 255 | |
b844eba2 | 256 | device_unregister(led_cdev->dev); |
c72a1d60 | 257 | |
72f8da32 | 258 | down_write(&leds_list_lock); |
c72a1d60 | 259 | list_del(&led_cdev->node); |
72f8da32 | 260 | up_write(&leds_list_lock); |
acd899e4 JA |
261 | |
262 | mutex_destroy(&led_cdev->led_access); | |
c72a1d60 | 263 | } |
b844eba2 | 264 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 | 265 | |
ca1bb4ee BA |
266 | static void devm_led_classdev_release(struct device *dev, void *res) |
267 | { | |
268 | led_classdev_unregister(*(struct led_classdev **)res); | |
269 | } | |
270 | ||
271 | /** | |
272 | * devm_led_classdev_register - resource managed led_classdev_register() | |
273 | * @parent: The device to register. | |
274 | * @led_cdev: the led_classdev structure for this device. | |
275 | */ | |
276 | int devm_led_classdev_register(struct device *parent, | |
277 | struct led_classdev *led_cdev) | |
278 | { | |
279 | struct led_classdev **dr; | |
280 | int rc; | |
281 | ||
282 | dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL); | |
283 | if (!dr) | |
284 | return -ENOMEM; | |
285 | ||
286 | rc = led_classdev_register(parent, led_cdev); | |
287 | if (rc) { | |
288 | devres_free(dr); | |
289 | return rc; | |
290 | } | |
291 | ||
292 | *dr = led_cdev; | |
293 | devres_add(parent, dr); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | EXPORT_SYMBOL_GPL(devm_led_classdev_register); | |
298 | ||
299 | static int devm_led_classdev_match(struct device *dev, void *res, void *data) | |
300 | { | |
301 | struct led_cdev **p = res; | |
302 | ||
303 | if (WARN_ON(!p || !*p)) | |
304 | return 0; | |
305 | ||
306 | return *p == data; | |
307 | } | |
308 | ||
309 | /** | |
310 | * devm_led_classdev_unregister() - resource managed led_classdev_unregister() | |
311 | * @parent: The device to unregister. | |
312 | * @led_cdev: the led_classdev structure for this device. | |
313 | */ | |
314 | void devm_led_classdev_unregister(struct device *dev, | |
315 | struct led_classdev *led_cdev) | |
316 | { | |
317 | WARN_ON(devres_release(dev, | |
318 | devm_led_classdev_release, | |
319 | devm_led_classdev_match, led_cdev)); | |
320 | } | |
321 | EXPORT_SYMBOL_GPL(devm_led_classdev_unregister); | |
322 | ||
c72a1d60 RP |
323 | static int __init leds_init(void) |
324 | { | |
325 | leds_class = class_create(THIS_MODULE, "leds"); | |
326 | if (IS_ERR(leds_class)) | |
327 | return PTR_ERR(leds_class); | |
73e1ab41 | 328 | leds_class->pm = &leds_class_dev_pm_ops; |
5baa7503 | 329 | leds_class->dev_groups = led_groups; |
c72a1d60 RP |
330 | return 0; |
331 | } | |
332 | ||
333 | static void __exit leds_exit(void) | |
334 | { | |
335 | class_destroy(leds_class); | |
336 | } | |
337 | ||
338 | subsys_initcall(leds_init); | |
339 | module_exit(leds_exit); | |
340 | ||
341 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
342 | MODULE_LICENSE("GPL"); | |
343 | MODULE_DESCRIPTION("LED Class Interface"); |