Commit | Line | Data |
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c3bc9956 RP |
1 | /* |
2 | * LED Triggers Core | |
3 | * | |
f8a7c6fe | 4 | * Copyright 2005-2007 Openedhand Ltd. |
c3bc9956 RP |
5 | * |
6 | * Author: Richard Purdie <rpurdie@openedhand.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
c3bc9956 RP |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> | |
c3bc9956 RP |
16 | #include <linux/list.h> |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/device.h> | |
c3bc9956 | 19 | #include <linux/timer.h> |
dc47206e | 20 | #include <linux/rwsem.h> |
c3bc9956 | 21 | #include <linux/leds.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
c3bc9956 RP |
23 | #include "leds.h" |
24 | ||
25 | /* | |
26 | * Nests outside led_cdev->trigger_lock | |
27 | */ | |
dc47206e | 28 | static DECLARE_RWSEM(triggers_list_lock); |
c3bc9956 RP |
29 | static LIST_HEAD(trigger_list); |
30 | ||
4d404fd5 NM |
31 | /* Used by LED Class */ |
32 | ||
f8a7c6fe RP |
33 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
34 | const char *buf, size_t count) | |
c3bc9956 | 35 | { |
f8a7c6fe | 36 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
37 | char trigger_name[TRIG_NAME_MAX]; |
38 | struct led_trigger *trig; | |
39 | size_t len; | |
acd899e4 JA |
40 | int ret = count; |
41 | ||
42 | mutex_lock(&led_cdev->led_access); | |
43 | ||
44 | if (led_sysfs_is_disabled(led_cdev)) { | |
45 | ret = -EBUSY; | |
46 | goto unlock; | |
47 | } | |
c3bc9956 RP |
48 | |
49 | trigger_name[sizeof(trigger_name) - 1] = '\0'; | |
50 | strncpy(trigger_name, buf, sizeof(trigger_name) - 1); | |
51 | len = strlen(trigger_name); | |
52 | ||
53 | if (len && trigger_name[len - 1] == '\n') | |
54 | trigger_name[len - 1] = '\0'; | |
55 | ||
56 | if (!strcmp(trigger_name, "none")) { | |
0013b23d | 57 | led_trigger_remove(led_cdev); |
acd899e4 | 58 | goto unlock; |
c3bc9956 RP |
59 | } |
60 | ||
dc47206e | 61 | down_read(&triggers_list_lock); |
c3bc9956 RP |
62 | list_for_each_entry(trig, &trigger_list, next_trig) { |
63 | if (!strcmp(trigger_name, trig->name)) { | |
dc47206e | 64 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 65 | led_trigger_set(led_cdev, trig); |
dc47206e | 66 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 67 | |
dc47206e | 68 | up_read(&triggers_list_lock); |
acd899e4 | 69 | goto unlock; |
c3bc9956 RP |
70 | } |
71 | } | |
dc47206e | 72 | up_read(&triggers_list_lock); |
c3bc9956 | 73 | |
acd899e4 JA |
74 | unlock: |
75 | mutex_unlock(&led_cdev->led_access); | |
76 | return ret; | |
c3bc9956 | 77 | } |
4d404fd5 | 78 | EXPORT_SYMBOL_GPL(led_trigger_store); |
c3bc9956 | 79 | |
f8a7c6fe RP |
80 | ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, |
81 | char *buf) | |
c3bc9956 | 82 | { |
f8a7c6fe | 83 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
84 | struct led_trigger *trig; |
85 | int len = 0; | |
86 | ||
dc47206e RP |
87 | down_read(&triggers_list_lock); |
88 | down_read(&led_cdev->trigger_lock); | |
c3bc9956 RP |
89 | |
90 | if (!led_cdev->trigger) | |
91 | len += sprintf(buf+len, "[none] "); | |
92 | else | |
93 | len += sprintf(buf+len, "none "); | |
94 | ||
95 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
96 | if (led_cdev->trigger && !strcmp(led_cdev->trigger->name, | |
97 | trig->name)) | |
98 | len += sprintf(buf+len, "[%s] ", trig->name); | |
99 | else | |
100 | len += sprintf(buf+len, "%s ", trig->name); | |
101 | } | |
dc47206e RP |
102 | up_read(&led_cdev->trigger_lock); |
103 | up_read(&triggers_list_lock); | |
c3bc9956 RP |
104 | |
105 | len += sprintf(len+buf, "\n"); | |
106 | return len; | |
107 | } | |
4d404fd5 | 108 | EXPORT_SYMBOL_GPL(led_trigger_show); |
c3bc9956 RP |
109 | |
110 | /* Caller must ensure led_cdev->trigger_lock held */ | |
eb202621 | 111 | void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) |
c3bc9956 RP |
112 | { |
113 | unsigned long flags; | |
52c47742 CC |
114 | char *event = NULL; |
115 | char *envp[2]; | |
116 | const char *name; | |
117 | ||
118 | name = trig ? trig->name : "none"; | |
119 | event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name); | |
c3bc9956 RP |
120 | |
121 | /* Remove any existing trigger */ | |
122 | if (led_cdev->trigger) { | |
123 | write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); | |
124 | list_del(&led_cdev->trig_list); | |
4d404fd5 NM |
125 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, |
126 | flags); | |
d23a22a7 FB |
127 | cancel_work_sync(&led_cdev->set_brightness_work); |
128 | led_stop_software_blink(led_cdev); | |
c3bc9956 RP |
129 | if (led_cdev->trigger->deactivate) |
130 | led_cdev->trigger->deactivate(led_cdev); | |
fe3025b5 | 131 | led_cdev->trigger = NULL; |
19cd67e2 | 132 | led_set_brightness(led_cdev, LED_OFF); |
c3bc9956 | 133 | } |
eb202621 BW |
134 | if (trig) { |
135 | write_lock_irqsave(&trig->leddev_list_lock, flags); | |
136 | list_add_tail(&led_cdev->trig_list, &trig->led_cdevs); | |
137 | write_unlock_irqrestore(&trig->leddev_list_lock, flags); | |
138 | led_cdev->trigger = trig; | |
139 | if (trig->activate) | |
140 | trig->activate(led_cdev); | |
c3bc9956 | 141 | } |
52c47742 CC |
142 | |
143 | if (event) { | |
144 | envp[0] = event; | |
145 | envp[1] = NULL; | |
146 | kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp); | |
147 | kfree(event); | |
148 | } | |
c3bc9956 | 149 | } |
4d404fd5 | 150 | EXPORT_SYMBOL_GPL(led_trigger_set); |
c3bc9956 | 151 | |
0013b23d NM |
152 | void led_trigger_remove(struct led_classdev *led_cdev) |
153 | { | |
154 | down_write(&led_cdev->trigger_lock); | |
155 | led_trigger_set(led_cdev, NULL); | |
156 | up_write(&led_cdev->trigger_lock); | |
157 | } | |
4d404fd5 | 158 | EXPORT_SYMBOL_GPL(led_trigger_remove); |
0013b23d | 159 | |
c3bc9956 RP |
160 | void led_trigger_set_default(struct led_classdev *led_cdev) |
161 | { | |
162 | struct led_trigger *trig; | |
163 | ||
164 | if (!led_cdev->default_trigger) | |
165 | return; | |
166 | ||
dc47206e RP |
167 | down_read(&triggers_list_lock); |
168 | down_write(&led_cdev->trigger_lock); | |
c3bc9956 RP |
169 | list_for_each_entry(trig, &trigger_list, next_trig) { |
170 | if (!strcmp(led_cdev->default_trigger, trig->name)) | |
171 | led_trigger_set(led_cdev, trig); | |
172 | } | |
dc47206e RP |
173 | up_write(&led_cdev->trigger_lock); |
174 | up_read(&triggers_list_lock); | |
c3bc9956 | 175 | } |
4d404fd5 NM |
176 | EXPORT_SYMBOL_GPL(led_trigger_set_default); |
177 | ||
a8df7b1a FB |
178 | void led_trigger_rename_static(const char *name, struct led_trigger *trig) |
179 | { | |
180 | /* new name must be on a temporary string to prevent races */ | |
181 | BUG_ON(name == trig->name); | |
182 | ||
183 | down_write(&triggers_list_lock); | |
184 | /* this assumes that trig->name was originaly allocated to | |
185 | * non constant storage */ | |
186 | strcpy((char *)trig->name, name); | |
187 | up_write(&triggers_list_lock); | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(led_trigger_rename_static); | |
190 | ||
4d404fd5 | 191 | /* LED Trigger Interface */ |
c3bc9956 | 192 | |
eb202621 | 193 | int led_trigger_register(struct led_trigger *trig) |
c3bc9956 RP |
194 | { |
195 | struct led_classdev *led_cdev; | |
eb202621 | 196 | struct led_trigger *_trig; |
c3bc9956 | 197 | |
eb202621 BW |
198 | rwlock_init(&trig->leddev_list_lock); |
199 | INIT_LIST_HEAD(&trig->led_cdevs); | |
c3bc9956 | 200 | |
dc47206e | 201 | down_write(&triggers_list_lock); |
700c6ea2 | 202 | /* Make sure the trigger's name isn't already in use */ |
eb202621 BW |
203 | list_for_each_entry(_trig, &trigger_list, next_trig) { |
204 | if (!strcmp(_trig->name, trig->name)) { | |
700c6ea2 AN |
205 | up_write(&triggers_list_lock); |
206 | return -EEXIST; | |
207 | } | |
208 | } | |
209 | /* Add to the list of led triggers */ | |
eb202621 | 210 | list_add_tail(&trig->next_trig, &trigger_list); |
dc47206e | 211 | up_write(&triggers_list_lock); |
c3bc9956 RP |
212 | |
213 | /* Register with any LEDs that have this as a default trigger */ | |
72f8da32 | 214 | down_read(&leds_list_lock); |
c3bc9956 | 215 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 216 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 217 | if (!led_cdev->trigger && led_cdev->default_trigger && |
eb202621 BW |
218 | !strcmp(led_cdev->default_trigger, trig->name)) |
219 | led_trigger_set(led_cdev, trig); | |
dc47206e | 220 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 221 | } |
72f8da32 | 222 | up_read(&leds_list_lock); |
c3bc9956 RP |
223 | |
224 | return 0; | |
225 | } | |
4d404fd5 | 226 | EXPORT_SYMBOL_GPL(led_trigger_register); |
c3bc9956 | 227 | |
eb202621 | 228 | void led_trigger_unregister(struct led_trigger *trig) |
c3bc9956 RP |
229 | { |
230 | struct led_classdev *led_cdev; | |
231 | ||
14f5716b SL |
232 | if (list_empty_careful(&trig->next_trig)) |
233 | return; | |
234 | ||
c3bc9956 | 235 | /* Remove from the list of led triggers */ |
dc47206e | 236 | down_write(&triggers_list_lock); |
14f5716b | 237 | list_del_init(&trig->next_trig); |
dc47206e | 238 | up_write(&triggers_list_lock); |
c3bc9956 RP |
239 | |
240 | /* Remove anyone actively using this trigger */ | |
72f8da32 | 241 | down_read(&leds_list_lock); |
c3bc9956 | 242 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 243 | down_write(&led_cdev->trigger_lock); |
eb202621 | 244 | if (led_cdev->trigger == trig) |
c3bc9956 | 245 | led_trigger_set(led_cdev, NULL); |
dc47206e | 246 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 247 | } |
72f8da32 | 248 | up_read(&leds_list_lock); |
c3bc9956 | 249 | } |
4d404fd5 | 250 | EXPORT_SYMBOL_GPL(led_trigger_unregister); |
c3bc9956 | 251 | |
9534cc31 HK |
252 | static void devm_led_trigger_release(struct device *dev, void *res) |
253 | { | |
254 | led_trigger_unregister(*(struct led_trigger **)res); | |
255 | } | |
256 | ||
257 | int devm_led_trigger_register(struct device *dev, | |
258 | struct led_trigger *trig) | |
259 | { | |
260 | struct led_trigger **dr; | |
261 | int rc; | |
262 | ||
263 | dr = devres_alloc(devm_led_trigger_release, sizeof(*dr), | |
264 | GFP_KERNEL); | |
265 | if (!dr) | |
266 | return -ENOMEM; | |
267 | ||
268 | *dr = trig; | |
269 | ||
270 | rc = led_trigger_register(trig); | |
271 | if (rc) | |
272 | devres_free(dr); | |
273 | else | |
274 | devres_add(dev, dr); | |
275 | ||
276 | return rc; | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(devm_led_trigger_register); | |
279 | ||
4d404fd5 NM |
280 | /* Simple LED Tigger Interface */ |
281 | ||
eb202621 | 282 | void led_trigger_event(struct led_trigger *trig, |
4d404fd5 | 283 | enum led_brightness brightness) |
c3bc9956 | 284 | { |
11e043b5 | 285 | struct led_classdev *led_cdev; |
4d404fd5 | 286 | |
eb202621 | 287 | if (!trig) |
4d404fd5 NM |
288 | return; |
289 | ||
eb202621 | 290 | read_lock(&trig->leddev_list_lock); |
11e043b5 | 291 | list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) |
d23a22a7 | 292 | led_set_brightness(led_cdev, brightness); |
eb202621 | 293 | read_unlock(&trig->leddev_list_lock); |
c3bc9956 | 294 | } |
4d404fd5 | 295 | EXPORT_SYMBOL_GPL(led_trigger_event); |
c3bc9956 | 296 | |
20c0e6b8 | 297 | static void led_trigger_blink_setup(struct led_trigger *trig, |
5bb629c5 FB |
298 | unsigned long *delay_on, |
299 | unsigned long *delay_off, | |
300 | int oneshot, | |
301 | int invert) | |
0b9536c9 | 302 | { |
11e043b5 | 303 | struct led_classdev *led_cdev; |
0b9536c9 | 304 | |
eb202621 | 305 | if (!trig) |
0b9536c9 VK |
306 | return; |
307 | ||
eb202621 | 308 | read_lock(&trig->leddev_list_lock); |
11e043b5 | 309 | list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) { |
5bb629c5 FB |
310 | if (oneshot) |
311 | led_blink_set_oneshot(led_cdev, delay_on, delay_off, | |
312 | invert); | |
313 | else | |
314 | led_blink_set(led_cdev, delay_on, delay_off); | |
0b9536c9 | 315 | } |
eb202621 | 316 | read_unlock(&trig->leddev_list_lock); |
0b9536c9 | 317 | } |
5bb629c5 FB |
318 | |
319 | void led_trigger_blink(struct led_trigger *trig, | |
320 | unsigned long *delay_on, | |
321 | unsigned long *delay_off) | |
322 | { | |
323 | led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0); | |
324 | } | |
0b9536c9 VK |
325 | EXPORT_SYMBOL_GPL(led_trigger_blink); |
326 | ||
5bb629c5 FB |
327 | void led_trigger_blink_oneshot(struct led_trigger *trig, |
328 | unsigned long *delay_on, | |
329 | unsigned long *delay_off, | |
330 | int invert) | |
331 | { | |
332 | led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert); | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot); | |
335 | ||
4d404fd5 NM |
336 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) |
337 | { | |
eb202621 | 338 | struct led_trigger *trig; |
4d404fd5 | 339 | int err; |
c3bc9956 | 340 | |
eb202621 | 341 | trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); |
c3bc9956 | 342 | |
eb202621 BW |
343 | if (trig) { |
344 | trig->name = name; | |
345 | err = led_trigger_register(trig); | |
cba4c2ac | 346 | if (err < 0) { |
eb202621 BW |
347 | kfree(trig); |
348 | trig = NULL; | |
09f5fe75 SK |
349 | pr_warn("LED trigger %s failed to register (%d)\n", |
350 | name, err); | |
cba4c2ac | 351 | } |
09f5fe75 SK |
352 | } else { |
353 | pr_warn("LED trigger %s failed to register (no memory)\n", | |
354 | name); | |
355 | } | |
eb202621 | 356 | *tp = trig; |
4d404fd5 | 357 | } |
c3bc9956 | 358 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); |
4d404fd5 | 359 | |
eb202621 | 360 | void led_trigger_unregister_simple(struct led_trigger *trig) |
4d404fd5 | 361 | { |
eb202621 BW |
362 | if (trig) |
363 | led_trigger_unregister(trig); | |
364 | kfree(trig); | |
4d404fd5 | 365 | } |
c3bc9956 | 366 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); |
c3bc9956 RP |
367 | |
368 | MODULE_AUTHOR("Richard Purdie"); | |
369 | MODULE_LICENSE("GPL"); | |
370 | MODULE_DESCRIPTION("LED Triggers Core"); |