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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> | |
22 | #include <linux/leds.h> | |
23 | #include "leds.h" | |
24 | ||
25 | /* | |
26 | * Nests outside led_cdev->trigger_lock | |
27 | */ | |
34af946a | 28 | static DEFINE_RWLOCK(triggers_list_lock); |
c3bc9956 RP |
29 | static LIST_HEAD(trigger_list); |
30 | ||
f8a7c6fe RP |
31 | ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr, |
32 | const char *buf, size_t count) | |
c3bc9956 | 33 | { |
f8a7c6fe | 34 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c3bc9956 RP |
35 | char trigger_name[TRIG_NAME_MAX]; |
36 | struct led_trigger *trig; | |
37 | size_t len; | |
38 | ||
39 | trigger_name[sizeof(trigger_name) - 1] = '\0'; | |
40 | strncpy(trigger_name, buf, sizeof(trigger_name) - 1); | |
41 | len = strlen(trigger_name); | |
42 | ||
43 | if (len && trigger_name[len - 1] == '\n') | |
44 | trigger_name[len - 1] = '\0'; | |
45 | ||
46 | if (!strcmp(trigger_name, "none")) { | |
47 | write_lock(&led_cdev->trigger_lock); | |
48 | led_trigger_set(led_cdev, NULL); | |
49 | write_unlock(&led_cdev->trigger_lock); | |
50 | return count; | |
51 | } | |
52 | ||
53 | read_lock(&triggers_list_lock); | |
54 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
55 | if (!strcmp(trigger_name, trig->name)) { | |
56 | write_lock(&led_cdev->trigger_lock); | |
57 | led_trigger_set(led_cdev, trig); | |
58 | write_unlock(&led_cdev->trigger_lock); | |
59 | ||
60 | read_unlock(&triggers_list_lock); | |
61 | return count; | |
62 | } | |
63 | } | |
64 | read_unlock(&triggers_list_lock); | |
65 | ||
66 | return -EINVAL; | |
67 | } | |
68 | ||
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 | ||
77 | read_lock(&triggers_list_lock); | |
78 | read_lock(&led_cdev->trigger_lock); | |
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 | } | |
92 | read_unlock(&led_cdev->trigger_lock); | |
93 | read_unlock(&triggers_list_lock); | |
94 | ||
95 | len += sprintf(len+buf, "\n"); | |
96 | return len; | |
97 | } | |
98 | ||
99 | void led_trigger_event(struct led_trigger *trigger, | |
100 | enum led_brightness brightness) | |
101 | { | |
102 | struct list_head *entry; | |
103 | ||
104 | if (!trigger) | |
105 | return; | |
106 | ||
107 | read_lock(&trigger->leddev_list_lock); | |
108 | list_for_each(entry, &trigger->led_cdevs) { | |
109 | struct led_classdev *led_cdev; | |
110 | ||
111 | led_cdev = list_entry(entry, struct led_classdev, trig_list); | |
112 | led_set_brightness(led_cdev, brightness); | |
113 | } | |
114 | read_unlock(&trigger->leddev_list_lock); | |
115 | } | |
116 | ||
117 | /* Caller must ensure led_cdev->trigger_lock held */ | |
118 | void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger) | |
119 | { | |
120 | unsigned long flags; | |
121 | ||
122 | /* Remove any existing trigger */ | |
123 | if (led_cdev->trigger) { | |
124 | write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); | |
125 | list_del(&led_cdev->trig_list); | |
126 | write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags); | |
127 | if (led_cdev->trigger->deactivate) | |
128 | led_cdev->trigger->deactivate(led_cdev); | |
e3e5fc91 | 129 | led_set_brightness(led_cdev, LED_OFF); |
c3bc9956 RP |
130 | } |
131 | if (trigger) { | |
132 | write_lock_irqsave(&trigger->leddev_list_lock, flags); | |
133 | list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs); | |
134 | write_unlock_irqrestore(&trigger->leddev_list_lock, flags); | |
135 | if (trigger->activate) | |
136 | trigger->activate(led_cdev); | |
137 | } | |
138 | led_cdev->trigger = trigger; | |
139 | } | |
140 | ||
141 | void led_trigger_set_default(struct led_classdev *led_cdev) | |
142 | { | |
143 | struct led_trigger *trig; | |
144 | ||
145 | if (!led_cdev->default_trigger) | |
146 | return; | |
147 | ||
148 | read_lock(&triggers_list_lock); | |
149 | write_lock(&led_cdev->trigger_lock); | |
150 | list_for_each_entry(trig, &trigger_list, next_trig) { | |
151 | if (!strcmp(led_cdev->default_trigger, trig->name)) | |
152 | led_trigger_set(led_cdev, trig); | |
153 | } | |
154 | write_unlock(&led_cdev->trigger_lock); | |
155 | read_unlock(&triggers_list_lock); | |
156 | } | |
157 | ||
158 | int led_trigger_register(struct led_trigger *trigger) | |
159 | { | |
160 | struct led_classdev *led_cdev; | |
161 | ||
162 | rwlock_init(&trigger->leddev_list_lock); | |
163 | INIT_LIST_HEAD(&trigger->led_cdevs); | |
164 | ||
165 | /* Add to the list of led triggers */ | |
166 | write_lock(&triggers_list_lock); | |
167 | list_add_tail(&trigger->next_trig, &trigger_list); | |
168 | write_unlock(&triggers_list_lock); | |
169 | ||
170 | /* Register with any LEDs that have this as a default trigger */ | |
171 | read_lock(&leds_list_lock); | |
172 | list_for_each_entry(led_cdev, &leds_list, node) { | |
173 | write_lock(&led_cdev->trigger_lock); | |
174 | if (!led_cdev->trigger && led_cdev->default_trigger && | |
175 | !strcmp(led_cdev->default_trigger, trigger->name)) | |
176 | led_trigger_set(led_cdev, trigger); | |
177 | write_unlock(&led_cdev->trigger_lock); | |
178 | } | |
179 | read_unlock(&leds_list_lock); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | void led_trigger_register_simple(const char *name, struct led_trigger **tp) | |
185 | { | |
186 | struct led_trigger *trigger; | |
e3986f63 | 187 | int err; |
c3bc9956 RP |
188 | |
189 | trigger = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); | |
190 | ||
191 | if (trigger) { | |
192 | trigger->name = name; | |
e3986f63 RP |
193 | err = led_trigger_register(trigger); |
194 | if (err < 0) | |
195 | printk(KERN_WARNING "LED trigger %s failed to register" | |
196 | " (%d)\n", name, err); | |
197 | } else | |
198 | printk(KERN_WARNING "LED trigger %s failed to register" | |
199 | " (no memory)\n", name); | |
200 | ||
c3bc9956 RP |
201 | *tp = trigger; |
202 | } | |
203 | ||
204 | void led_trigger_unregister(struct led_trigger *trigger) | |
205 | { | |
206 | struct led_classdev *led_cdev; | |
207 | ||
208 | /* Remove from the list of led triggers */ | |
209 | write_lock(&triggers_list_lock); | |
210 | list_del(&trigger->next_trig); | |
211 | write_unlock(&triggers_list_lock); | |
212 | ||
213 | /* Remove anyone actively using this trigger */ | |
214 | read_lock(&leds_list_lock); | |
215 | list_for_each_entry(led_cdev, &leds_list, node) { | |
216 | write_lock(&led_cdev->trigger_lock); | |
217 | if (led_cdev->trigger == trigger) | |
218 | led_trigger_set(led_cdev, NULL); | |
219 | write_unlock(&led_cdev->trigger_lock); | |
220 | } | |
221 | read_unlock(&leds_list_lock); | |
222 | } | |
223 | ||
224 | void led_trigger_unregister_simple(struct led_trigger *trigger) | |
225 | { | |
3593a6d6 RP |
226 | if (trigger) |
227 | led_trigger_unregister(trigger); | |
c3bc9956 RP |
228 | kfree(trigger); |
229 | } | |
230 | ||
231 | /* Used by LED Class */ | |
232 | EXPORT_SYMBOL_GPL(led_trigger_set); | |
233 | EXPORT_SYMBOL_GPL(led_trigger_set_default); | |
234 | EXPORT_SYMBOL_GPL(led_trigger_show); | |
235 | EXPORT_SYMBOL_GPL(led_trigger_store); | |
236 | ||
237 | /* LED Trigger Interface */ | |
238 | EXPORT_SYMBOL_GPL(led_trigger_register); | |
239 | EXPORT_SYMBOL_GPL(led_trigger_unregister); | |
240 | ||
241 | /* Simple LED Tigger Interface */ | |
242 | EXPORT_SYMBOL_GPL(led_trigger_register_simple); | |
243 | EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); | |
244 | EXPORT_SYMBOL_GPL(led_trigger_event); | |
245 | ||
246 | MODULE_AUTHOR("Richard Purdie"); | |
247 | MODULE_LICENSE("GPL"); | |
248 | MODULE_DESCRIPTION("LED Triggers Core"); |