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 | 37 | struct led_trigger *trig; |
acd899e4 JA |
38 | int ret = count; |
39 | ||
40 | mutex_lock(&led_cdev->led_access); | |
41 | ||
42 | if (led_sysfs_is_disabled(led_cdev)) { | |
43 | ret = -EBUSY; | |
44 | goto unlock; | |
45 | } | |
c3bc9956 | 46 | |
7296c33e | 47 | if (sysfs_streq(buf, "none")) { |
0013b23d | 48 | led_trigger_remove(led_cdev); |
acd899e4 | 49 | goto unlock; |
c3bc9956 RP |
50 | } |
51 | ||
dc47206e | 52 | down_read(&triggers_list_lock); |
c3bc9956 | 53 | list_for_each_entry(trig, &trigger_list, next_trig) { |
7296c33e | 54 | if (sysfs_streq(buf, trig->name)) { |
dc47206e | 55 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 56 | led_trigger_set(led_cdev, trig); |
dc47206e | 57 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 58 | |
dc47206e | 59 | up_read(&triggers_list_lock); |
acd899e4 | 60 | goto unlock; |
c3bc9956 RP |
61 | } |
62 | } | |
dc47206e | 63 | up_read(&triggers_list_lock); |
c3bc9956 | 64 | |
acd899e4 JA |
65 | unlock: |
66 | mutex_unlock(&led_cdev->led_access); | |
67 | return ret; | |
c3bc9956 | 68 | } |
4d404fd5 | 69 | EXPORT_SYMBOL_GPL(led_trigger_store); |
c3bc9956 | 70 | |
f8a7c6fe RP |
71 | ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, |
72 | char *buf) | |
c3bc9956 | 73 | { |
f8a7c6fe | 74 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
75 | struct led_trigger *trig; |
76 | int len = 0; | |
77 | ||
dc47206e RP |
78 | down_read(&triggers_list_lock); |
79 | down_read(&led_cdev->trigger_lock); | |
c3bc9956 RP |
80 | |
81 | if (!led_cdev->trigger) | |
82 | len += sprintf(buf+len, "[none] "); | |
83 | else | |
84 | len += sprintf(buf+len, "none "); | |
85 | ||
86 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
87 | if (led_cdev->trigger && !strcmp(led_cdev->trigger->name, | |
88 | trig->name)) | |
89 | len += sprintf(buf+len, "[%s] ", trig->name); | |
90 | else | |
91 | len += sprintf(buf+len, "%s ", trig->name); | |
92 | } | |
dc47206e RP |
93 | up_read(&led_cdev->trigger_lock); |
94 | up_read(&triggers_list_lock); | |
c3bc9956 RP |
95 | |
96 | len += sprintf(len+buf, "\n"); | |
97 | return len; | |
98 | } | |
4d404fd5 | 99 | EXPORT_SYMBOL_GPL(led_trigger_show); |
c3bc9956 RP |
100 | |
101 | /* Caller must ensure led_cdev->trigger_lock held */ | |
eb202621 | 102 | void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) |
c3bc9956 RP |
103 | { |
104 | unsigned long flags; | |
52c47742 CC |
105 | char *event = NULL; |
106 | char *envp[2]; | |
107 | const char *name; | |
108 | ||
109 | name = trig ? trig->name : "none"; | |
110 | event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name); | |
c3bc9956 RP |
111 | |
112 | /* Remove any existing trigger */ | |
113 | if (led_cdev->trigger) { | |
114 | write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); | |
115 | list_del(&led_cdev->trig_list); | |
4d404fd5 NM |
116 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, |
117 | flags); | |
d23a22a7 FB |
118 | cancel_work_sync(&led_cdev->set_brightness_work); |
119 | led_stop_software_blink(led_cdev); | |
c3bc9956 RP |
120 | if (led_cdev->trigger->deactivate) |
121 | led_cdev->trigger->deactivate(led_cdev); | |
fe3025b5 | 122 | led_cdev->trigger = NULL; |
19cd67e2 | 123 | led_set_brightness(led_cdev, LED_OFF); |
c3bc9956 | 124 | } |
eb202621 BW |
125 | if (trig) { |
126 | write_lock_irqsave(&trig->leddev_list_lock, flags); | |
127 | list_add_tail(&led_cdev->trig_list, &trig->led_cdevs); | |
128 | write_unlock_irqrestore(&trig->leddev_list_lock, flags); | |
129 | led_cdev->trigger = trig; | |
130 | if (trig->activate) | |
131 | trig->activate(led_cdev); | |
c3bc9956 | 132 | } |
52c47742 CC |
133 | |
134 | if (event) { | |
135 | envp[0] = event; | |
136 | envp[1] = NULL; | |
137 | kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp); | |
138 | kfree(event); | |
139 | } | |
c3bc9956 | 140 | } |
4d404fd5 | 141 | EXPORT_SYMBOL_GPL(led_trigger_set); |
c3bc9956 | 142 | |
0013b23d NM |
143 | void led_trigger_remove(struct led_classdev *led_cdev) |
144 | { | |
145 | down_write(&led_cdev->trigger_lock); | |
146 | led_trigger_set(led_cdev, NULL); | |
147 | up_write(&led_cdev->trigger_lock); | |
148 | } | |
4d404fd5 | 149 | EXPORT_SYMBOL_GPL(led_trigger_remove); |
0013b23d | 150 | |
c3bc9956 RP |
151 | void led_trigger_set_default(struct led_classdev *led_cdev) |
152 | { | |
153 | struct led_trigger *trig; | |
154 | ||
155 | if (!led_cdev->default_trigger) | |
156 | return; | |
157 | ||
dc47206e RP |
158 | down_read(&triggers_list_lock); |
159 | down_write(&led_cdev->trigger_lock); | |
c3bc9956 RP |
160 | list_for_each_entry(trig, &trigger_list, next_trig) { |
161 | if (!strcmp(led_cdev->default_trigger, trig->name)) | |
162 | led_trigger_set(led_cdev, trig); | |
163 | } | |
dc47206e RP |
164 | up_write(&led_cdev->trigger_lock); |
165 | up_read(&triggers_list_lock); | |
c3bc9956 | 166 | } |
4d404fd5 NM |
167 | EXPORT_SYMBOL_GPL(led_trigger_set_default); |
168 | ||
a8df7b1a FB |
169 | void led_trigger_rename_static(const char *name, struct led_trigger *trig) |
170 | { | |
171 | /* new name must be on a temporary string to prevent races */ | |
172 | BUG_ON(name == trig->name); | |
173 | ||
174 | down_write(&triggers_list_lock); | |
175 | /* this assumes that trig->name was originaly allocated to | |
176 | * non constant storage */ | |
177 | strcpy((char *)trig->name, name); | |
178 | up_write(&triggers_list_lock); | |
179 | } | |
180 | EXPORT_SYMBOL_GPL(led_trigger_rename_static); | |
181 | ||
4d404fd5 | 182 | /* LED Trigger Interface */ |
c3bc9956 | 183 | |
eb202621 | 184 | int led_trigger_register(struct led_trigger *trig) |
c3bc9956 RP |
185 | { |
186 | struct led_classdev *led_cdev; | |
eb202621 | 187 | struct led_trigger *_trig; |
c3bc9956 | 188 | |
eb202621 BW |
189 | rwlock_init(&trig->leddev_list_lock); |
190 | INIT_LIST_HEAD(&trig->led_cdevs); | |
c3bc9956 | 191 | |
dc47206e | 192 | down_write(&triggers_list_lock); |
700c6ea2 | 193 | /* Make sure the trigger's name isn't already in use */ |
eb202621 BW |
194 | list_for_each_entry(_trig, &trigger_list, next_trig) { |
195 | if (!strcmp(_trig->name, trig->name)) { | |
700c6ea2 AN |
196 | up_write(&triggers_list_lock); |
197 | return -EEXIST; | |
198 | } | |
199 | } | |
200 | /* Add to the list of led triggers */ | |
eb202621 | 201 | list_add_tail(&trig->next_trig, &trigger_list); |
dc47206e | 202 | up_write(&triggers_list_lock); |
c3bc9956 RP |
203 | |
204 | /* Register with any LEDs that have this as a default trigger */ | |
72f8da32 | 205 | down_read(&leds_list_lock); |
c3bc9956 | 206 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 207 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 208 | if (!led_cdev->trigger && led_cdev->default_trigger && |
eb202621 BW |
209 | !strcmp(led_cdev->default_trigger, trig->name)) |
210 | led_trigger_set(led_cdev, trig); | |
dc47206e | 211 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 212 | } |
72f8da32 | 213 | up_read(&leds_list_lock); |
c3bc9956 RP |
214 | |
215 | return 0; | |
216 | } | |
4d404fd5 | 217 | EXPORT_SYMBOL_GPL(led_trigger_register); |
c3bc9956 | 218 | |
eb202621 | 219 | void led_trigger_unregister(struct led_trigger *trig) |
c3bc9956 RP |
220 | { |
221 | struct led_classdev *led_cdev; | |
222 | ||
14f5716b SL |
223 | if (list_empty_careful(&trig->next_trig)) |
224 | return; | |
225 | ||
c3bc9956 | 226 | /* Remove from the list of led triggers */ |
dc47206e | 227 | down_write(&triggers_list_lock); |
14f5716b | 228 | list_del_init(&trig->next_trig); |
dc47206e | 229 | up_write(&triggers_list_lock); |
c3bc9956 RP |
230 | |
231 | /* Remove anyone actively using this trigger */ | |
72f8da32 | 232 | down_read(&leds_list_lock); |
c3bc9956 | 233 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 234 | down_write(&led_cdev->trigger_lock); |
eb202621 | 235 | if (led_cdev->trigger == trig) |
c3bc9956 | 236 | led_trigger_set(led_cdev, NULL); |
dc47206e | 237 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 238 | } |
72f8da32 | 239 | up_read(&leds_list_lock); |
c3bc9956 | 240 | } |
4d404fd5 | 241 | EXPORT_SYMBOL_GPL(led_trigger_unregister); |
c3bc9956 | 242 | |
9534cc31 HK |
243 | static void devm_led_trigger_release(struct device *dev, void *res) |
244 | { | |
245 | led_trigger_unregister(*(struct led_trigger **)res); | |
246 | } | |
247 | ||
248 | int devm_led_trigger_register(struct device *dev, | |
249 | struct led_trigger *trig) | |
250 | { | |
251 | struct led_trigger **dr; | |
252 | int rc; | |
253 | ||
254 | dr = devres_alloc(devm_led_trigger_release, sizeof(*dr), | |
255 | GFP_KERNEL); | |
256 | if (!dr) | |
257 | return -ENOMEM; | |
258 | ||
259 | *dr = trig; | |
260 | ||
261 | rc = led_trigger_register(trig); | |
262 | if (rc) | |
263 | devres_free(dr); | |
264 | else | |
265 | devres_add(dev, dr); | |
266 | ||
267 | return rc; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(devm_led_trigger_register); | |
270 | ||
4d404fd5 NM |
271 | /* Simple LED Tigger Interface */ |
272 | ||
eb202621 | 273 | void led_trigger_event(struct led_trigger *trig, |
4d404fd5 | 274 | enum led_brightness brightness) |
c3bc9956 | 275 | { |
11e043b5 | 276 | struct led_classdev *led_cdev; |
4d404fd5 | 277 | |
eb202621 | 278 | if (!trig) |
4d404fd5 NM |
279 | return; |
280 | ||
eb202621 | 281 | read_lock(&trig->leddev_list_lock); |
11e043b5 | 282 | list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) |
d23a22a7 | 283 | led_set_brightness(led_cdev, brightness); |
eb202621 | 284 | read_unlock(&trig->leddev_list_lock); |
c3bc9956 | 285 | } |
4d404fd5 | 286 | EXPORT_SYMBOL_GPL(led_trigger_event); |
c3bc9956 | 287 | |
20c0e6b8 | 288 | static void led_trigger_blink_setup(struct led_trigger *trig, |
5bb629c5 FB |
289 | unsigned long *delay_on, |
290 | unsigned long *delay_off, | |
291 | int oneshot, | |
292 | int invert) | |
0b9536c9 | 293 | { |
11e043b5 | 294 | struct led_classdev *led_cdev; |
0b9536c9 | 295 | |
eb202621 | 296 | if (!trig) |
0b9536c9 VK |
297 | return; |
298 | ||
eb202621 | 299 | read_lock(&trig->leddev_list_lock); |
11e043b5 | 300 | list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) { |
5bb629c5 FB |
301 | if (oneshot) |
302 | led_blink_set_oneshot(led_cdev, delay_on, delay_off, | |
303 | invert); | |
304 | else | |
305 | led_blink_set(led_cdev, delay_on, delay_off); | |
0b9536c9 | 306 | } |
eb202621 | 307 | read_unlock(&trig->leddev_list_lock); |
0b9536c9 | 308 | } |
5bb629c5 FB |
309 | |
310 | void led_trigger_blink(struct led_trigger *trig, | |
311 | unsigned long *delay_on, | |
312 | unsigned long *delay_off) | |
313 | { | |
314 | led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0); | |
315 | } | |
0b9536c9 VK |
316 | EXPORT_SYMBOL_GPL(led_trigger_blink); |
317 | ||
5bb629c5 FB |
318 | void led_trigger_blink_oneshot(struct led_trigger *trig, |
319 | unsigned long *delay_on, | |
320 | unsigned long *delay_off, | |
321 | int invert) | |
322 | { | |
323 | led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert); | |
324 | } | |
325 | EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot); | |
326 | ||
4d404fd5 NM |
327 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) |
328 | { | |
eb202621 | 329 | struct led_trigger *trig; |
4d404fd5 | 330 | int err; |
c3bc9956 | 331 | |
eb202621 | 332 | trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); |
c3bc9956 | 333 | |
eb202621 BW |
334 | if (trig) { |
335 | trig->name = name; | |
336 | err = led_trigger_register(trig); | |
cba4c2ac | 337 | if (err < 0) { |
eb202621 BW |
338 | kfree(trig); |
339 | trig = NULL; | |
09f5fe75 SK |
340 | pr_warn("LED trigger %s failed to register (%d)\n", |
341 | name, err); | |
cba4c2ac | 342 | } |
09f5fe75 SK |
343 | } else { |
344 | pr_warn("LED trigger %s failed to register (no memory)\n", | |
345 | name); | |
346 | } | |
eb202621 | 347 | *tp = trig; |
4d404fd5 | 348 | } |
c3bc9956 | 349 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); |
4d404fd5 | 350 | |
eb202621 | 351 | void led_trigger_unregister_simple(struct led_trigger *trig) |
4d404fd5 | 352 | { |
eb202621 BW |
353 | if (trig) |
354 | led_trigger_unregister(trig); | |
355 | kfree(trig); | |
4d404fd5 | 356 | } |
c3bc9956 | 357 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); |
c3bc9956 RP |
358 | |
359 | MODULE_AUTHOR("Richard Purdie"); | |
360 | MODULE_LICENSE("GPL"); | |
361 | MODULE_DESCRIPTION("LED Triggers Core"); |