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> |
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); |
0013b23d | 60 | |
acd899e4 JA |
61 | ret = size; |
62 | unlock: | |
63 | mutex_unlock(&led_cdev->led_access); | |
64 | return ret; | |
c72a1d60 | 65 | } |
5baa7503 | 66 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 67 | |
38419612 | 68 | static ssize_t max_brightness_show(struct device *dev, |
1bd465e6 GL |
69 | struct device_attribute *attr, char *buf) |
70 | { | |
71 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
72 | ||
73 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
74 | } | |
38419612 | 75 | static DEVICE_ATTR_RO(max_brightness); |
1bd465e6 | 76 | |
c3bc9956 | 77 | #ifdef CONFIG_LEDS_TRIGGERS |
5baa7503 GKH |
78 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
79 | static struct attribute *led_trigger_attrs[] = { | |
80 | &dev_attr_trigger.attr, | |
81 | NULL, | |
82 | }; | |
83 | static const struct attribute_group led_trigger_group = { | |
84 | .attrs = led_trigger_attrs, | |
85 | }; | |
86 | #endif | |
87 | ||
88 | static struct attribute *led_class_attrs[] = { | |
89 | &dev_attr_brightness.attr, | |
90 | &dev_attr_max_brightness.attr, | |
91 | NULL, | |
92 | }; | |
93 | ||
94 | static const struct attribute_group led_group = { | |
95 | .attrs = led_class_attrs, | |
96 | }; | |
97 | ||
98 | static const struct attribute_group *led_groups[] = { | |
99 | &led_group, | |
100 | #ifdef CONFIG_LEDS_TRIGGERS | |
101 | &led_trigger_group, | |
c3bc9956 | 102 | #endif |
5baa7503 | 103 | NULL, |
14b5d6dd | 104 | }; |
c72a1d60 RP |
105 | |
106 | /** | |
107 | * led_classdev_suspend - suspend an led_classdev. | |
108 | * @led_cdev: the led_classdev to suspend. | |
109 | */ | |
110 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
111 | { | |
112 | led_cdev->flags |= LED_SUSPENDED; | |
81fe8e5b | 113 | led_set_brightness_nopm(led_cdev, 0); |
c72a1d60 RP |
114 | } |
115 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
116 | ||
117 | /** | |
118 | * led_classdev_resume - resume an led_classdev. | |
119 | * @led_cdev: the led_classdev to resume. | |
120 | */ | |
121 | void led_classdev_resume(struct led_classdev *led_cdev) | |
122 | { | |
81fe8e5b | 123 | led_set_brightness_nopm(led_cdev, led_cdev->brightness); |
7aea8389 JA |
124 | |
125 | if (led_cdev->flash_resume) | |
126 | led_cdev->flash_resume(led_cdev); | |
127 | ||
c72a1d60 RP |
128 | led_cdev->flags &= ~LED_SUSPENDED; |
129 | } | |
130 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
131 | ||
084609bf | 132 | #ifdef CONFIG_PM_SLEEP |
73e1ab41 | 133 | static int led_suspend(struct device *dev) |
859cb7f2 RP |
134 | { |
135 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
136 | ||
137 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
138 | led_classdev_suspend(led_cdev); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int led_resume(struct device *dev) | |
144 | { | |
145 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
146 | ||
147 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
148 | led_classdev_resume(led_cdev); | |
149 | ||
150 | return 0; | |
151 | } | |
084609bf | 152 | #endif |
859cb7f2 | 153 | |
084609bf | 154 | static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume); |
73e1ab41 | 155 | |
a96aa64c RRD |
156 | static int match_name(struct device *dev, const void *data) |
157 | { | |
158 | if (!dev_name(dev)) | |
159 | return 0; | |
160 | return !strcmp(dev_name(dev), (char *)data); | |
161 | } | |
162 | ||
163 | static int led_classdev_next_name(const char *init_name, char *name, | |
164 | size_t len) | |
165 | { | |
166 | unsigned int i = 0; | |
167 | int ret = 0; | |
e5b5a61f | 168 | struct device *dev; |
a96aa64c RRD |
169 | |
170 | strlcpy(name, init_name, len); | |
171 | ||
e5b5a61f RRD |
172 | while ((ret < len) && |
173 | (dev = class_find_device(leds_class, NULL, name, match_name))) { | |
174 | put_device(dev); | |
a96aa64c | 175 | ret = snprintf(name, len, "%s_%u", init_name, ++i); |
e5b5a61f | 176 | } |
a96aa64c RRD |
177 | |
178 | if (ret >= len) | |
179 | return -ENOMEM; | |
180 | ||
181 | return i; | |
182 | } | |
183 | ||
c72a1d60 RP |
184 | /** |
185 | * led_classdev_register - register a new object of led_classdev class. | |
ff8649af | 186 | * @parent: The device to register. |
c72a1d60 RP |
187 | * @led_cdev: the led_classdev structure for this device. |
188 | */ | |
189 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
190 | { | |
eb1ce746 | 191 | char name[LED_MAX_NAME_SIZE]; |
a96aa64c RRD |
192 | int ret; |
193 | ||
194 | ret = led_classdev_next_name(led_cdev->name, name, sizeof(name)); | |
195 | if (ret < 0) | |
196 | return ret; | |
197 | ||
d0d480cc | 198 | led_cdev->dev = device_create_with_groups(leds_class, parent, 0, |
ccdc4507 | 199 | led_cdev, led_cdev->groups, "%s", name); |
801678c5 | 200 | if (IS_ERR(led_cdev->dev)) |
f8a7c6fe | 201 | return PTR_ERR(led_cdev->dev); |
c72a1d60 | 202 | |
a96aa64c | 203 | if (ret) |
6f06c7f8 | 204 | dev_warn(parent, "Led %s renamed to %s due to name collision", |
a96aa64c RRD |
205 | led_cdev->name, dev_name(led_cdev->dev)); |
206 | ||
270c3957 RP |
207 | #ifdef CONFIG_LEDS_TRIGGERS |
208 | init_rwsem(&led_cdev->trigger_lock); | |
209 | #endif | |
acd899e4 | 210 | mutex_init(&led_cdev->led_access); |
c72a1d60 | 211 | /* add to the list of leds */ |
72f8da32 | 212 | down_write(&leds_list_lock); |
c72a1d60 | 213 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 214 | up_write(&leds_list_lock); |
c72a1d60 | 215 | |
1bd465e6 GL |
216 | if (!led_cdev->max_brightness) |
217 | led_cdev->max_brightness = LED_FULL; | |
218 | ||
29d76dfa HMH |
219 | led_update_brightness(led_cdev); |
220 | ||
757b06ae | 221 | led_init_core(led_cdev); |
5ada28bf | 222 | |
c3bc9956 | 223 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 224 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
225 | #endif |
226 | ||
d23e7b8b | 227 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 228 | led_cdev->name); |
c72a1d60 RP |
229 | |
230 | return 0; | |
231 | } | |
232 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
233 | ||
234 | /** | |
0266a458 | 235 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 236 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
237 | * |
238 | * Unregisters a previously registered via led_classdev_register object. | |
239 | */ | |
b844eba2 | 240 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 241 | { |
c3bc9956 | 242 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 243 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
244 | if (led_cdev->trigger) |
245 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 246 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 247 | #endif |
c72a1d60 | 248 | |
d84d80f3 HK |
249 | led_cdev->flags |= LED_UNREGISTERING; |
250 | ||
5ada28bf | 251 | /* Stop blinking */ |
d23a22a7 | 252 | led_stop_software_blink(led_cdev); |
d1aa577f | 253 | |
19cd67e2 | 254 | led_set_brightness(led_cdev, LED_OFF); |
5ada28bf | 255 | |
d1aa577f MK |
256 | flush_work(&led_cdev->set_brightness_work); |
257 | ||
b844eba2 | 258 | device_unregister(led_cdev->dev); |
c72a1d60 | 259 | |
72f8da32 | 260 | down_write(&leds_list_lock); |
c72a1d60 | 261 | list_del(&led_cdev->node); |
72f8da32 | 262 | up_write(&leds_list_lock); |
acd899e4 JA |
263 | |
264 | mutex_destroy(&led_cdev->led_access); | |
c72a1d60 | 265 | } |
b844eba2 | 266 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 | 267 | |
ca1bb4ee BA |
268 | static void devm_led_classdev_release(struct device *dev, void *res) |
269 | { | |
270 | led_classdev_unregister(*(struct led_classdev **)res); | |
271 | } | |
272 | ||
273 | /** | |
274 | * devm_led_classdev_register - resource managed led_classdev_register() | |
275 | * @parent: The device to register. | |
276 | * @led_cdev: the led_classdev structure for this device. | |
277 | */ | |
278 | int devm_led_classdev_register(struct device *parent, | |
279 | struct led_classdev *led_cdev) | |
280 | { | |
281 | struct led_classdev **dr; | |
282 | int rc; | |
283 | ||
284 | dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL); | |
285 | if (!dr) | |
286 | return -ENOMEM; | |
287 | ||
288 | rc = led_classdev_register(parent, led_cdev); | |
289 | if (rc) { | |
290 | devres_free(dr); | |
291 | return rc; | |
292 | } | |
293 | ||
294 | *dr = led_cdev; | |
295 | devres_add(parent, dr); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | EXPORT_SYMBOL_GPL(devm_led_classdev_register); | |
300 | ||
301 | static int devm_led_classdev_match(struct device *dev, void *res, void *data) | |
302 | { | |
303 | struct led_cdev **p = res; | |
304 | ||
305 | if (WARN_ON(!p || !*p)) | |
306 | return 0; | |
307 | ||
308 | return *p == data; | |
309 | } | |
310 | ||
311 | /** | |
312 | * devm_led_classdev_unregister() - resource managed led_classdev_unregister() | |
313 | * @parent: The device to unregister. | |
314 | * @led_cdev: the led_classdev structure for this device. | |
315 | */ | |
316 | void devm_led_classdev_unregister(struct device *dev, | |
317 | struct led_classdev *led_cdev) | |
318 | { | |
319 | WARN_ON(devres_release(dev, | |
320 | devm_led_classdev_release, | |
321 | devm_led_classdev_match, led_cdev)); | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(devm_led_classdev_unregister); | |
324 | ||
c72a1d60 RP |
325 | static int __init leds_init(void) |
326 | { | |
327 | leds_class = class_create(THIS_MODULE, "leds"); | |
328 | if (IS_ERR(leds_class)) | |
329 | return PTR_ERR(leds_class); | |
73e1ab41 | 330 | leds_class->pm = &leds_class_dev_pm_ops; |
5baa7503 | 331 | leds_class->dev_groups = led_groups; |
c72a1d60 RP |
332 | return 0; |
333 | } | |
334 | ||
335 | static void __exit leds_exit(void) | |
336 | { | |
337 | class_destroy(leds_class); | |
338 | } | |
339 | ||
340 | subsys_initcall(leds_init); | |
341 | module_exit(leds_exit); | |
342 | ||
343 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
344 | MODULE_LICENSE("GPL"); | |
345 | MODULE_DESCRIPTION("LED Class Interface"); |