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> | |
16 | #include <linux/init.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/device.h> | |
c3bc9956 | 20 | #include <linux/timer.h> |
dc47206e | 21 | #include <linux/rwsem.h> |
c3bc9956 | 22 | #include <linux/leds.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
c3bc9956 RP |
24 | #include "leds.h" |
25 | ||
26 | /* | |
27 | * Nests outside led_cdev->trigger_lock | |
28 | */ | |
dc47206e | 29 | static DECLARE_RWSEM(triggers_list_lock); |
c3bc9956 RP |
30 | static LIST_HEAD(trigger_list); |
31 | ||
4d404fd5 NM |
32 | /* Used by LED Class */ |
33 | ||
f8a7c6fe RP |
34 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
35 | const char *buf, size_t count) | |
c3bc9956 | 36 | { |
f8a7c6fe | 37 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
38 | char trigger_name[TRIG_NAME_MAX]; |
39 | struct led_trigger *trig; | |
40 | size_t len; | |
41 | ||
42 | trigger_name[sizeof(trigger_name) - 1] = '\0'; | |
43 | strncpy(trigger_name, buf, sizeof(trigger_name) - 1); | |
44 | len = strlen(trigger_name); | |
45 | ||
46 | if (len && trigger_name[len - 1] == '\n') | |
47 | trigger_name[len - 1] = '\0'; | |
48 | ||
49 | if (!strcmp(trigger_name, "none")) { | |
0013b23d | 50 | led_trigger_remove(led_cdev); |
c3bc9956 RP |
51 | return count; |
52 | } | |
53 | ||
dc47206e | 54 | down_read(&triggers_list_lock); |
c3bc9956 RP |
55 | list_for_each_entry(trig, &trigger_list, next_trig) { |
56 | if (!strcmp(trigger_name, trig->name)) { | |
dc47206e | 57 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 58 | led_trigger_set(led_cdev, trig); |
dc47206e | 59 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 60 | |
dc47206e | 61 | up_read(&triggers_list_lock); |
c3bc9956 RP |
62 | return count; |
63 | } | |
64 | } | |
dc47206e | 65 | up_read(&triggers_list_lock); |
c3bc9956 RP |
66 | |
67 | return -EINVAL; | |
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 | ||
169 | /* LED Trigger Interface */ | |
c3bc9956 | 170 | |
eb202621 | 171 | int led_trigger_register(struct led_trigger *trig) |
c3bc9956 RP |
172 | { |
173 | struct led_classdev *led_cdev; | |
eb202621 | 174 | struct led_trigger *_trig; |
c3bc9956 | 175 | |
eb202621 BW |
176 | rwlock_init(&trig->leddev_list_lock); |
177 | INIT_LIST_HEAD(&trig->led_cdevs); | |
c3bc9956 | 178 | |
dc47206e | 179 | down_write(&triggers_list_lock); |
700c6ea2 | 180 | /* Make sure the trigger's name isn't already in use */ |
eb202621 BW |
181 | list_for_each_entry(_trig, &trigger_list, next_trig) { |
182 | if (!strcmp(_trig->name, trig->name)) { | |
700c6ea2 AN |
183 | up_write(&triggers_list_lock); |
184 | return -EEXIST; | |
185 | } | |
186 | } | |
187 | /* Add to the list of led triggers */ | |
eb202621 | 188 | list_add_tail(&trig->next_trig, &trigger_list); |
dc47206e | 189 | up_write(&triggers_list_lock); |
c3bc9956 RP |
190 | |
191 | /* Register with any LEDs that have this as a default trigger */ | |
72f8da32 | 192 | down_read(&leds_list_lock); |
c3bc9956 | 193 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 194 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 195 | if (!led_cdev->trigger && led_cdev->default_trigger && |
eb202621 BW |
196 | !strcmp(led_cdev->default_trigger, trig->name)) |
197 | led_trigger_set(led_cdev, trig); | |
dc47206e | 198 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 199 | } |
72f8da32 | 200 | up_read(&leds_list_lock); |
c3bc9956 RP |
201 | |
202 | return 0; | |
203 | } | |
4d404fd5 | 204 | EXPORT_SYMBOL_GPL(led_trigger_register); |
c3bc9956 | 205 | |
eb202621 | 206 | void led_trigger_unregister(struct led_trigger *trig) |
c3bc9956 RP |
207 | { |
208 | struct led_classdev *led_cdev; | |
209 | ||
210 | /* Remove from the list of led triggers */ | |
dc47206e | 211 | down_write(&triggers_list_lock); |
eb202621 | 212 | list_del(&trig->next_trig); |
dc47206e | 213 | up_write(&triggers_list_lock); |
c3bc9956 RP |
214 | |
215 | /* Remove anyone actively using this trigger */ | |
72f8da32 | 216 | down_read(&leds_list_lock); |
c3bc9956 | 217 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 218 | down_write(&led_cdev->trigger_lock); |
eb202621 | 219 | if (led_cdev->trigger == trig) |
c3bc9956 | 220 | led_trigger_set(led_cdev, NULL); |
dc47206e | 221 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 222 | } |
72f8da32 | 223 | up_read(&leds_list_lock); |
c3bc9956 | 224 | } |
4d404fd5 | 225 | EXPORT_SYMBOL_GPL(led_trigger_unregister); |
c3bc9956 | 226 | |
4d404fd5 NM |
227 | /* Simple LED Tigger Interface */ |
228 | ||
eb202621 | 229 | void led_trigger_event(struct led_trigger *trig, |
4d404fd5 | 230 | enum led_brightness brightness) |
c3bc9956 | 231 | { |
4d404fd5 NM |
232 | struct list_head *entry; |
233 | ||
eb202621 | 234 | if (!trig) |
4d404fd5 NM |
235 | return; |
236 | ||
eb202621 BW |
237 | read_lock(&trig->leddev_list_lock); |
238 | list_for_each(entry, &trig->led_cdevs) { | |
4d404fd5 NM |
239 | struct led_classdev *led_cdev; |
240 | ||
241 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
d23a22a7 | 242 | led_set_brightness(led_cdev, brightness); |
4d404fd5 | 243 | } |
eb202621 | 244 | read_unlock(&trig->leddev_list_lock); |
c3bc9956 | 245 | } |
4d404fd5 | 246 | EXPORT_SYMBOL_GPL(led_trigger_event); |
c3bc9956 | 247 | |
20c0e6b8 | 248 | static void led_trigger_blink_setup(struct led_trigger *trig, |
5bb629c5 FB |
249 | unsigned long *delay_on, |
250 | unsigned long *delay_off, | |
251 | int oneshot, | |
252 | int invert) | |
0b9536c9 VK |
253 | { |
254 | struct list_head *entry; | |
255 | ||
eb202621 | 256 | if (!trig) |
0b9536c9 VK |
257 | return; |
258 | ||
eb202621 BW |
259 | read_lock(&trig->leddev_list_lock); |
260 | list_for_each(entry, &trig->led_cdevs) { | |
0b9536c9 VK |
261 | struct led_classdev *led_cdev; |
262 | ||
263 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
5bb629c5 FB |
264 | if (oneshot) |
265 | led_blink_set_oneshot(led_cdev, delay_on, delay_off, | |
266 | invert); | |
267 | else | |
268 | led_blink_set(led_cdev, delay_on, delay_off); | |
0b9536c9 | 269 | } |
eb202621 | 270 | read_unlock(&trig->leddev_list_lock); |
0b9536c9 | 271 | } |
5bb629c5 FB |
272 | |
273 | void led_trigger_blink(struct led_trigger *trig, | |
274 | unsigned long *delay_on, | |
275 | unsigned long *delay_off) | |
276 | { | |
277 | led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0); | |
278 | } | |
0b9536c9 VK |
279 | EXPORT_SYMBOL_GPL(led_trigger_blink); |
280 | ||
5bb629c5 FB |
281 | void led_trigger_blink_oneshot(struct led_trigger *trig, |
282 | unsigned long *delay_on, | |
283 | unsigned long *delay_off, | |
284 | int invert) | |
285 | { | |
286 | led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert); | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot); | |
289 | ||
4d404fd5 NM |
290 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) |
291 | { | |
eb202621 | 292 | struct led_trigger *trig; |
4d404fd5 | 293 | int err; |
c3bc9956 | 294 | |
eb202621 | 295 | trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); |
c3bc9956 | 296 | |
eb202621 BW |
297 | if (trig) { |
298 | trig->name = name; | |
299 | err = led_trigger_register(trig); | |
cba4c2ac | 300 | if (err < 0) { |
eb202621 BW |
301 | kfree(trig); |
302 | trig = NULL; | |
4d404fd5 NM |
303 | printk(KERN_WARNING "LED trigger %s failed to register" |
304 | " (%d)\n", name, err); | |
cba4c2ac | 305 | } |
4d404fd5 NM |
306 | } else |
307 | printk(KERN_WARNING "LED trigger %s failed to register" | |
308 | " (no memory)\n", name); | |
309 | ||
eb202621 | 310 | *tp = trig; |
4d404fd5 | 311 | } |
c3bc9956 | 312 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); |
4d404fd5 | 313 | |
eb202621 | 314 | void led_trigger_unregister_simple(struct led_trigger *trig) |
4d404fd5 | 315 | { |
eb202621 BW |
316 | if (trig) |
317 | led_trigger_unregister(trig); | |
318 | kfree(trig); | |
4d404fd5 | 319 | } |
c3bc9956 | 320 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); |
c3bc9956 RP |
321 | |
322 | MODULE_AUTHOR("Richard Purdie"); | |
323 | MODULE_LICENSE("GPL"); | |
324 | MODULE_DESCRIPTION("LED Triggers Core"); |