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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> | |
20 | #include <linux/sysdev.h> | |
21 | #include <linux/timer.h> | |
dc47206e | 22 | #include <linux/rwsem.h> |
c3bc9956 | 23 | #include <linux/leds.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
c3bc9956 RP |
25 | #include "leds.h" |
26 | ||
27 | /* | |
28 | * Nests outside led_cdev->trigger_lock | |
29 | */ | |
dc47206e | 30 | static DECLARE_RWSEM(triggers_list_lock); |
c3bc9956 RP |
31 | static LIST_HEAD(trigger_list); |
32 | ||
4d404fd5 NM |
33 | /* Used by LED Class */ |
34 | ||
f8a7c6fe RP |
35 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
36 | const char *buf, size_t count) | |
c3bc9956 | 37 | { |
f8a7c6fe | 38 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
39 | char trigger_name[TRIG_NAME_MAX]; |
40 | struct led_trigger *trig; | |
41 | size_t len; | |
42 | ||
43 | trigger_name[sizeof(trigger_name) - 1] = '\0'; | |
44 | strncpy(trigger_name, buf, sizeof(trigger_name) - 1); | |
45 | len = strlen(trigger_name); | |
46 | ||
47 | if (len && trigger_name[len - 1] == '\n') | |
48 | trigger_name[len - 1] = '\0'; | |
49 | ||
50 | if (!strcmp(trigger_name, "none")) { | |
0013b23d | 51 | led_trigger_remove(led_cdev); |
c3bc9956 RP |
52 | return count; |
53 | } | |
54 | ||
dc47206e | 55 | down_read(&triggers_list_lock); |
c3bc9956 RP |
56 | list_for_each_entry(trig, &trigger_list, next_trig) { |
57 | if (!strcmp(trigger_name, trig->name)) { | |
dc47206e | 58 | down_write(&led_cdev->trigger_lock); |
c3bc9956 | 59 | led_trigger_set(led_cdev, trig); |
dc47206e | 60 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 61 | |
dc47206e | 62 | up_read(&triggers_list_lock); |
c3bc9956 RP |
63 | return count; |
64 | } | |
65 | } | |
dc47206e | 66 | up_read(&triggers_list_lock); |
c3bc9956 RP |
67 | |
68 | return -EINVAL; | |
69 | } | |
4d404fd5 | 70 | EXPORT_SYMBOL_GPL(led_trigger_store); |
c3bc9956 | 71 | |
f8a7c6fe RP |
72 | ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, |
73 | char *buf) | |
c3bc9956 | 74 | { |
f8a7c6fe | 75 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
76 | struct led_trigger *trig; |
77 | int len = 0; | |
78 | ||
dc47206e RP |
79 | down_read(&triggers_list_lock); |
80 | down_read(&led_cdev->trigger_lock); | |
c3bc9956 RP |
81 | |
82 | if (!led_cdev->trigger) | |
83 | len += sprintf(buf+len, "[none] "); | |
84 | else | |
85 | len += sprintf(buf+len, "none "); | |
86 | ||
87 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
88 | if (led_cdev->trigger && !strcmp(led_cdev->trigger->name, | |
89 | trig->name)) | |
90 | len += sprintf(buf+len, "[%s] ", trig->name); | |
91 | else | |
92 | len += sprintf(buf+len, "%s ", trig->name); | |
93 | } | |
dc47206e RP |
94 | up_read(&led_cdev->trigger_lock); |
95 | up_read(&triggers_list_lock); | |
c3bc9956 RP |
96 | |
97 | len += sprintf(len+buf, "\n"); | |
98 | return len; | |
99 | } | |
4d404fd5 | 100 | EXPORT_SYMBOL_GPL(led_trigger_show); |
c3bc9956 RP |
101 | |
102 | /* Caller must ensure led_cdev->trigger_lock held */ | |
103 | void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger) | |
104 | { | |
105 | unsigned long flags; | |
106 | ||
107 | /* Remove any existing trigger */ | |
108 | if (led_cdev->trigger) { | |
109 | write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); | |
110 | list_del(&led_cdev->trig_list); | |
4d404fd5 NM |
111 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, |
112 | flags); | |
c3bc9956 RP |
113 | if (led_cdev->trigger->deactivate) |
114 | led_cdev->trigger->deactivate(led_cdev); | |
fe3025b5 | 115 | led_cdev->trigger = NULL; |
5ada28bf | 116 | led_brightness_set(led_cdev, LED_OFF); |
c3bc9956 RP |
117 | } |
118 | if (trigger) { | |
119 | write_lock_irqsave(&trigger->leddev_list_lock, flags); | |
120 | list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs); | |
121 | write_unlock_irqrestore(&trigger->leddev_list_lock, flags); | |
fe3025b5 | 122 | led_cdev->trigger = trigger; |
c3bc9956 RP |
123 | if (trigger->activate) |
124 | trigger->activate(led_cdev); | |
125 | } | |
c3bc9956 | 126 | } |
4d404fd5 | 127 | EXPORT_SYMBOL_GPL(led_trigger_set); |
c3bc9956 | 128 | |
0013b23d NM |
129 | void led_trigger_remove(struct led_classdev *led_cdev) |
130 | { | |
131 | down_write(&led_cdev->trigger_lock); | |
132 | led_trigger_set(led_cdev, NULL); | |
133 | up_write(&led_cdev->trigger_lock); | |
134 | } | |
4d404fd5 | 135 | EXPORT_SYMBOL_GPL(led_trigger_remove); |
0013b23d | 136 | |
c3bc9956 RP |
137 | void led_trigger_set_default(struct led_classdev *led_cdev) |
138 | { | |
139 | struct led_trigger *trig; | |
140 | ||
141 | if (!led_cdev->default_trigger) | |
142 | return; | |
143 | ||
dc47206e RP |
144 | down_read(&triggers_list_lock); |
145 | down_write(&led_cdev->trigger_lock); | |
c3bc9956 RP |
146 | list_for_each_entry(trig, &trigger_list, next_trig) { |
147 | if (!strcmp(led_cdev->default_trigger, trig->name)) | |
148 | led_trigger_set(led_cdev, trig); | |
149 | } | |
dc47206e RP |
150 | up_write(&led_cdev->trigger_lock); |
151 | up_read(&triggers_list_lock); | |
c3bc9956 | 152 | } |
4d404fd5 NM |
153 | EXPORT_SYMBOL_GPL(led_trigger_set_default); |
154 | ||
155 | /* LED Trigger Interface */ | |
c3bc9956 RP |
156 | |
157 | int led_trigger_register(struct led_trigger *trigger) | |
158 | { | |
159 | struct led_classdev *led_cdev; | |
700c6ea2 | 160 | struct led_trigger *trig; |
c3bc9956 RP |
161 | |
162 | rwlock_init(&trigger->leddev_list_lock); | |
163 | INIT_LIST_HEAD(&trigger->led_cdevs); | |
164 | ||
dc47206e | 165 | down_write(&triggers_list_lock); |
700c6ea2 AN |
166 | /* Make sure the trigger's name isn't already in use */ |
167 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
168 | if (!strcmp(trig->name, trigger->name)) { | |
169 | up_write(&triggers_list_lock); | |
170 | return -EEXIST; | |
171 | } | |
172 | } | |
173 | /* Add to the list of led triggers */ | |
c3bc9956 | 174 | list_add_tail(&trigger->next_trig, &trigger_list); |
dc47206e | 175 | up_write(&triggers_list_lock); |
c3bc9956 RP |
176 | |
177 | /* Register with any LEDs that have this as a default trigger */ | |
72f8da32 | 178 | down_read(&leds_list_lock); |
c3bc9956 | 179 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 180 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
181 | if (!led_cdev->trigger && led_cdev->default_trigger && |
182 | !strcmp(led_cdev->default_trigger, trigger->name)) | |
183 | led_trigger_set(led_cdev, trigger); | |
dc47206e | 184 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 185 | } |
72f8da32 | 186 | up_read(&leds_list_lock); |
c3bc9956 RP |
187 | |
188 | return 0; | |
189 | } | |
4d404fd5 | 190 | EXPORT_SYMBOL_GPL(led_trigger_register); |
c3bc9956 RP |
191 | |
192 | void led_trigger_unregister(struct led_trigger *trigger) | |
193 | { | |
194 | struct led_classdev *led_cdev; | |
195 | ||
196 | /* Remove from the list of led triggers */ | |
dc47206e | 197 | down_write(&triggers_list_lock); |
c3bc9956 | 198 | list_del(&trigger->next_trig); |
dc47206e | 199 | up_write(&triggers_list_lock); |
c3bc9956 RP |
200 | |
201 | /* Remove anyone actively using this trigger */ | |
72f8da32 | 202 | down_read(&leds_list_lock); |
c3bc9956 | 203 | list_for_each_entry(led_cdev, &leds_list, node) { |
dc47206e | 204 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
205 | if (led_cdev->trigger == trigger) |
206 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 207 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 208 | } |
72f8da32 | 209 | up_read(&leds_list_lock); |
c3bc9956 | 210 | } |
4d404fd5 | 211 | EXPORT_SYMBOL_GPL(led_trigger_unregister); |
c3bc9956 | 212 | |
4d404fd5 NM |
213 | /* Simple LED Tigger Interface */ |
214 | ||
215 | void led_trigger_event(struct led_trigger *trigger, | |
216 | enum led_brightness brightness) | |
c3bc9956 | 217 | { |
4d404fd5 NM |
218 | struct list_head *entry; |
219 | ||
220 | if (!trigger) | |
221 | return; | |
222 | ||
223 | read_lock(&trigger->leddev_list_lock); | |
224 | list_for_each(entry, &trigger->led_cdevs) { | |
225 | struct led_classdev *led_cdev; | |
226 | ||
227 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
228 | led_set_brightness(led_cdev, brightness); | |
229 | } | |
230 | read_unlock(&trigger->leddev_list_lock); | |
c3bc9956 | 231 | } |
4d404fd5 | 232 | EXPORT_SYMBOL_GPL(led_trigger_event); |
c3bc9956 | 233 | |
0b9536c9 VK |
234 | void led_trigger_blink(struct led_trigger *trigger, |
235 | unsigned long *delay_on, | |
236 | unsigned long *delay_off) | |
237 | { | |
238 | struct list_head *entry; | |
239 | ||
240 | if (!trigger) | |
241 | return; | |
242 | ||
243 | read_lock(&trigger->leddev_list_lock); | |
244 | list_for_each(entry, &trigger->led_cdevs) { | |
245 | struct led_classdev *led_cdev; | |
246 | ||
247 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
248 | led_blink_set(led_cdev, delay_on, delay_off); | |
249 | } | |
250 | read_unlock(&trigger->leddev_list_lock); | |
251 | } | |
252 | EXPORT_SYMBOL_GPL(led_trigger_blink); | |
253 | ||
4d404fd5 NM |
254 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) |
255 | { | |
256 | struct led_trigger *trigger; | |
257 | int err; | |
c3bc9956 | 258 | |
4d404fd5 | 259 | trigger = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); |
c3bc9956 | 260 | |
4d404fd5 NM |
261 | if (trigger) { |
262 | trigger->name = name; | |
263 | err = led_trigger_register(trigger); | |
264 | if (err < 0) | |
265 | printk(KERN_WARNING "LED trigger %s failed to register" | |
266 | " (%d)\n", name, err); | |
267 | } else | |
268 | printk(KERN_WARNING "LED trigger %s failed to register" | |
269 | " (no memory)\n", name); | |
270 | ||
271 | *tp = trigger; | |
272 | } | |
c3bc9956 | 273 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); |
4d404fd5 NM |
274 | |
275 | void led_trigger_unregister_simple(struct led_trigger *trigger) | |
276 | { | |
277 | if (trigger) | |
278 | led_trigger_unregister(trigger); | |
279 | kfree(trigger); | |
280 | } | |
c3bc9956 | 281 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); |
c3bc9956 RP |
282 | |
283 | MODULE_AUTHOR("Richard Purdie"); | |
284 | MODULE_LICENSE("GPL"); | |
285 | MODULE_DESCRIPTION("LED Triggers Core"); |