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