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; | |
105 | ||
106 | /* Remove any existing trigger */ | |
107 | if (led_cdev->trigger) { | |
108 | write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); | |
109 | list_del(&led_cdev->trig_list); | |
4d404fd5 NM |
110 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, |
111 | flags); | |
d23a22a7 FB |
112 | cancel_work_sync(&led_cdev->set_brightness_work); |
113 | led_stop_software_blink(led_cdev); | |
c3bc9956 RP |
114 | if (led_cdev->trigger->deactivate) |
115 | led_cdev->trigger->deactivate(led_cdev); | |
fe3025b5 | 116 | led_cdev->trigger = NULL; |
19cd67e2 | 117 | led_set_brightness(led_cdev, LED_OFF); |
c3bc9956 | 118 | } |
eb202621 BW |
119 | if (trig) { |
120 | write_lock_irqsave(&trig->leddev_list_lock, flags); | |
121 | list_add_tail(&led_cdev->trig_list, &trig->led_cdevs); | |
122 | write_unlock_irqrestore(&trig->leddev_list_lock, flags); | |
123 | led_cdev->trigger = trig; | |
124 | if (trig->activate) | |
125 | trig->activate(led_cdev); | |
c3bc9956 | 126 | } |
c3bc9956 | 127 | } |
4d404fd5 | 128 | EXPORT_SYMBOL_GPL(led_trigger_set); |
c3bc9956 | 129 | |
0013b23d NM |
130 | void led_trigger_remove(struct led_classdev *led_cdev) |
131 | { | |
132 | down_write(&led_cdev->trigger_lock); | |
133 | led_trigger_set(led_cdev, NULL); | |
134 | up_write(&led_cdev->trigger_lock); | |
135 | } | |
4d404fd5 | 136 | EXPORT_SYMBOL_GPL(led_trigger_remove); |
0013b23d | 137 | |
c3bc9956 RP |
138 | void led_trigger_set_default(struct led_classdev *led_cdev) |
139 | { | |
140 | struct led_trigger *trig; | |
141 | ||
142 | if (!led_cdev->default_trigger) | |
143 | return; | |
144 | ||
dc47206e RP |
145 | down_read(&triggers_list_lock); |
146 | down_write(&led_cdev->trigger_lock); | |
c3bc9956 RP |
147 | list_for_each_entry(trig, &trigger_list, next_trig) { |
148 | if (!strcmp(led_cdev->default_trigger, trig->name)) | |
149 | led_trigger_set(led_cdev, trig); | |
150 | } | |
dc47206e RP |
151 | up_write(&led_cdev->trigger_lock); |
152 | up_read(&triggers_list_lock); | |
c3bc9956 | 153 | } |
4d404fd5 NM |
154 | EXPORT_SYMBOL_GPL(led_trigger_set_default); |
155 | ||
156 | /* LED Trigger Interface */ | |
c3bc9956 | 157 | |
eb202621 | 158 | int led_trigger_register(struct led_trigger *trig) |
c3bc9956 RP |
159 | { |
160 | struct led_classdev *led_cdev; | |
eb202621 | 161 | struct led_trigger *_trig; |
c3bc9956 | 162 | |
eb202621 BW |
163 | rwlock_init(&trig->leddev_list_lock); |
164 | INIT_LIST_HEAD(&trig->led_cdevs); | |
c3bc9956 | 165 | |
dc47206e | 166 | down_write(&triggers_list_lock); |
700c6ea2 | 167 | /* Make sure the trigger's name isn't already in use */ |
eb202621 BW |
168 | list_for_each_entry(_trig, &trigger_list, next_trig) { |
169 | if (!strcmp(_trig->name, trig->name)) { | |
700c6ea2 AN |
170 | up_write(&triggers_list_lock); |
171 | return -EEXIST; | |
172 | } | |
173 | } | |
174 | /* Add to the list of led triggers */ | |
eb202621 | 175 | list_add_tail(&trig->next_trig, &trigger_list); |
dc47206e | 176 | up_write(&triggers_list_lock); |
c3bc9956 RP |
177 | |
178 | /* Register with any LEDs that have this as a default trigger */ | |
72f8da32 | 179 | down_read(&leds_list_lock); |
c3bc9956 | 180 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 181 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 182 | if (!led_cdev->trigger && led_cdev->default_trigger && |
eb202621 BW |
183 | !strcmp(led_cdev->default_trigger, trig->name)) |
184 | led_trigger_set(led_cdev, trig); | |
dc47206e | 185 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 186 | } |
72f8da32 | 187 | up_read(&leds_list_lock); |
c3bc9956 RP |
188 | |
189 | return 0; | |
190 | } | |
4d404fd5 | 191 | EXPORT_SYMBOL_GPL(led_trigger_register); |
c3bc9956 | 192 | |
eb202621 | 193 | void led_trigger_unregister(struct led_trigger *trig) |
c3bc9956 RP |
194 | { |
195 | struct led_classdev *led_cdev; | |
196 | ||
197 | /* Remove from the list of led triggers */ | |
dc47206e | 198 | down_write(&triggers_list_lock); |
eb202621 | 199 | list_del(&trig->next_trig); |
dc47206e | 200 | up_write(&triggers_list_lock); |
c3bc9956 RP |
201 | |
202 | /* Remove anyone actively using this trigger */ | |
72f8da32 | 203 | down_read(&leds_list_lock); |
c3bc9956 | 204 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 205 | down_write(&led_cdev->trigger_lock); |
eb202621 | 206 | if (led_cdev->trigger == trig) |
c3bc9956 | 207 | led_trigger_set(led_cdev, NULL); |
dc47206e | 208 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 209 | } |
72f8da32 | 210 | up_read(&leds_list_lock); |
c3bc9956 | 211 | } |
4d404fd5 | 212 | EXPORT_SYMBOL_GPL(led_trigger_unregister); |
c3bc9956 | 213 | |
4d404fd5 NM |
214 | /* Simple LED Tigger Interface */ |
215 | ||
eb202621 | 216 | void led_trigger_event(struct led_trigger *trig, |
4d404fd5 | 217 | enum led_brightness brightness) |
c3bc9956 | 218 | { |
4d404fd5 NM |
219 | struct list_head *entry; |
220 | ||
eb202621 | 221 | if (!trig) |
4d404fd5 NM |
222 | return; |
223 | ||
eb202621 BW |
224 | read_lock(&trig->leddev_list_lock); |
225 | list_for_each(entry, &trig->led_cdevs) { | |
4d404fd5 NM |
226 | struct led_classdev *led_cdev; |
227 | ||
228 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
d23a22a7 | 229 | led_set_brightness(led_cdev, brightness); |
4d404fd5 | 230 | } |
eb202621 | 231 | read_unlock(&trig->leddev_list_lock); |
c3bc9956 | 232 | } |
4d404fd5 | 233 | EXPORT_SYMBOL_GPL(led_trigger_event); |
c3bc9956 | 234 | |
20c0e6b8 | 235 | static void led_trigger_blink_setup(struct led_trigger *trig, |
5bb629c5 FB |
236 | unsigned long *delay_on, |
237 | unsigned long *delay_off, | |
238 | int oneshot, | |
239 | int invert) | |
0b9536c9 VK |
240 | { |
241 | struct list_head *entry; | |
242 | ||
eb202621 | 243 | if (!trig) |
0b9536c9 VK |
244 | return; |
245 | ||
eb202621 BW |
246 | read_lock(&trig->leddev_list_lock); |
247 | list_for_each(entry, &trig->led_cdevs) { | |
0b9536c9 VK |
248 | struct led_classdev *led_cdev; |
249 | ||
250 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
5bb629c5 FB |
251 | if (oneshot) |
252 | led_blink_set_oneshot(led_cdev, delay_on, delay_off, | |
253 | invert); | |
254 | else | |
255 | led_blink_set(led_cdev, delay_on, delay_off); | |
0b9536c9 | 256 | } |
eb202621 | 257 | read_unlock(&trig->leddev_list_lock); |
0b9536c9 | 258 | } |
5bb629c5 FB |
259 | |
260 | void led_trigger_blink(struct led_trigger *trig, | |
261 | unsigned long *delay_on, | |
262 | unsigned long *delay_off) | |
263 | { | |
264 | led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0); | |
265 | } | |
0b9536c9 VK |
266 | EXPORT_SYMBOL_GPL(led_trigger_blink); |
267 | ||
5bb629c5 FB |
268 | void led_trigger_blink_oneshot(struct led_trigger *trig, |
269 | unsigned long *delay_on, | |
270 | unsigned long *delay_off, | |
271 | int invert) | |
272 | { | |
273 | led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert); | |
274 | } | |
275 | EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot); | |
276 | ||
4d404fd5 NM |
277 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) |
278 | { | |
eb202621 | 279 | struct led_trigger *trig; |
4d404fd5 | 280 | int err; |
c3bc9956 | 281 | |
eb202621 | 282 | trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); |
c3bc9956 | 283 | |
eb202621 BW |
284 | if (trig) { |
285 | trig->name = name; | |
286 | err = led_trigger_register(trig); | |
cba4c2ac | 287 | if (err < 0) { |
eb202621 BW |
288 | kfree(trig); |
289 | trig = NULL; | |
4d404fd5 NM |
290 | printk(KERN_WARNING "LED trigger %s failed to register" |
291 | " (%d)\n", name, err); | |
cba4c2ac | 292 | } |
4d404fd5 NM |
293 | } else |
294 | printk(KERN_WARNING "LED trigger %s failed to register" | |
295 | " (no memory)\n", name); | |
296 | ||
eb202621 | 297 | *tp = trig; |
4d404fd5 | 298 | } |
c3bc9956 | 299 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); |
4d404fd5 | 300 | |
eb202621 | 301 | void led_trigger_unregister_simple(struct led_trigger *trig) |
4d404fd5 | 302 | { |
eb202621 BW |
303 | if (trig) |
304 | led_trigger_unregister(trig); | |
305 | kfree(trig); | |
4d404fd5 | 306 | } |
c3bc9956 | 307 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); |
c3bc9956 RP |
308 | |
309 | MODULE_AUTHOR("Richard Purdie"); | |
310 | MODULE_LICENSE("GPL"); | |
311 | MODULE_DESCRIPTION("LED Triggers Core"); |