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1 | /* |
2 | * LED Class Core |
3 | * |
4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> |
5 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/init.h> |
15 | #include <linux/list.h> |
16 | #include <linux/spinlock.h> |
17 | #include <linux/device.h> |
18 | #include <linux/timer.h> |
19 | #include <linux/err.h> |
20 | #include <linux/ctype.h> |
21 | #include <linux/leds.h> |
22 | #include "leds.h" |
23 | |
24 | static struct class *leds_class; |
25 | |
26 | static void led_update_brightness(struct led_classdev *led_cdev) |
27 | { |
28 | if (led_cdev->brightness_get) |
29 | led_cdev->brightness = led_cdev->brightness_get(led_cdev); |
30 | } |
31 | |
32 | static ssize_t led_brightness_show(struct device *dev, |
33 | struct device_attribute *attr, char *buf) |
34 | { |
35 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
36 | |
37 | /* no lock needed for this */ |
38 | led_update_brightness(led_cdev); |
39 | |
40 | return sprintf(buf, "%u\n", led_cdev->brightness); |
41 | } |
42 | |
43 | static ssize_t led_brightness_store(struct device *dev, |
44 | struct device_attribute *attr, const char *buf, size_t size) |
45 | { |
46 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
47 | ssize_t ret = -EINVAL; |
48 | char *after; |
49 | unsigned long state = simple_strtoul(buf, &after, 10); |
50 | size_t count = after - buf; |
51 | |
52 | if (isspace(*after)) |
53 | count++; |
54 | |
55 | if (count == size) { |
56 | ret = count; |
57 | |
58 | if (state == LED_OFF) |
59 | led_trigger_remove(led_cdev); |
60 | led_set_brightness(led_cdev, state); |
61 | } |
62 | |
63 | return ret; |
64 | } |
65 | |
66 | static ssize_t led_max_brightness_show(struct device *dev, |
67 | struct device_attribute *attr, char *buf) |
68 | { |
69 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
70 | |
71 | return sprintf(buf, "%u\n", led_cdev->max_brightness); |
72 | } |
73 | |
74 | static struct device_attribute led_class_attrs[] = { |
75 | __ATTR(brightness, 0644, led_brightness_show, led_brightness_store), |
76 | __ATTR(max_brightness, 0444, led_max_brightness_show, NULL), |
77 | #ifdef CONFIG_LEDS_TRIGGERS |
78 | __ATTR(trigger, 0644, led_trigger_show, led_trigger_store), |
79 | #endif |
80 | __ATTR_NULL, |
81 | }; |
82 | |
83 | static void led_timer_function(unsigned long data) |
84 | { |
85 | struct led_classdev *led_cdev = (void *)data; |
86 | unsigned long brightness; |
87 | unsigned long delay; |
88 | |
89 | if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { |
90 | led_set_brightness(led_cdev, LED_OFF); |
91 | return; |
92 | } |
93 | |
94 | brightness = led_get_brightness(led_cdev); |
95 | if (!brightness) { |
96 | /* Time to switch the LED on. */ |
97 | brightness = led_cdev->blink_brightness; |
98 | delay = led_cdev->blink_delay_on; |
99 | } else { |
100 | /* Store the current brightness value to be able |
101 | * to restore it when the delay_off period is over. |
102 | */ |
103 | led_cdev->blink_brightness = brightness; |
104 | brightness = LED_OFF; |
105 | delay = led_cdev->blink_delay_off; |
106 | } |
107 | |
108 | led_set_brightness(led_cdev, brightness); |
109 | |
110 | mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); |
111 | } |
112 | |
113 | /** |
114 | * led_classdev_suspend - suspend an led_classdev. |
115 | * @led_cdev: the led_classdev to suspend. |
116 | */ |
117 | void led_classdev_suspend(struct led_classdev *led_cdev) |
118 | { |
119 | led_cdev->flags |= LED_SUSPENDED; |
120 | led_cdev->brightness_set(led_cdev, 0); |
121 | } |
122 | EXPORT_SYMBOL_GPL(led_classdev_suspend); |
123 | |
124 | /** |
125 | * led_classdev_resume - resume an led_classdev. |
126 | * @led_cdev: the led_classdev to resume. |
127 | */ |
128 | void led_classdev_resume(struct led_classdev *led_cdev) |
129 | { |
130 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); |
131 | led_cdev->flags &= ~LED_SUSPENDED; |
132 | } |
133 | EXPORT_SYMBOL_GPL(led_classdev_resume); |
134 | |
135 | static int led_suspend(struct device *dev, pm_message_t state) |
136 | { |
137 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
138 | |
139 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
140 | led_classdev_suspend(led_cdev); |
141 | |
142 | return 0; |
143 | } |
144 | |
145 | static int led_resume(struct device *dev) |
146 | { |
147 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
148 | |
149 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
150 | led_classdev_resume(led_cdev); |
151 | |
152 | return 0; |
153 | } |
154 | |
155 | /** |
156 | * led_classdev_register - register a new object of led_classdev class. |
157 | * @parent: The device to register. |
158 | * @led_cdev: the led_classdev structure for this device. |
159 | */ |
160 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) |
161 | { |
162 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
163 | "%s", led_cdev->name); |
164 | if (IS_ERR(led_cdev->dev)) |
165 | return PTR_ERR(led_cdev->dev); |
166 | |
167 | #ifdef CONFIG_LEDS_TRIGGERS |
168 | init_rwsem(&led_cdev->trigger_lock); |
169 | #endif |
170 | /* add to the list of leds */ |
171 | down_write(&leds_list_lock); |
172 | list_add_tail(&led_cdev->node, &leds_list); |
173 | up_write(&leds_list_lock); |
174 | |
175 | if (!led_cdev->max_brightness) |
176 | led_cdev->max_brightness = LED_FULL; |
177 | |
178 | led_update_brightness(led_cdev); |
179 | |
180 | init_timer(&led_cdev->blink_timer); |
181 | led_cdev->blink_timer.function = led_timer_function; |
182 | led_cdev->blink_timer.data = (unsigned long)led_cdev; |
183 | |
184 | #ifdef CONFIG_LEDS_TRIGGERS |
185 | led_trigger_set_default(led_cdev); |
186 | #endif |
187 | |
188 | printk(KERN_DEBUG "Registered led device: %s\n", |
189 | led_cdev->name); |
190 | |
191 | return 0; |
192 | } |
193 | EXPORT_SYMBOL_GPL(led_classdev_register); |
194 | |
195 | /** |
196 | * led_classdev_unregister - unregisters a object of led_properties class. |
197 | * @led_cdev: the led device to unregister |
198 | * |
199 | * Unregisters a previously registered via led_classdev_register object. |
200 | */ |
201 | void led_classdev_unregister(struct led_classdev *led_cdev) |
202 | { |
203 | #ifdef CONFIG_LEDS_TRIGGERS |
204 | down_write(&led_cdev->trigger_lock); |
205 | if (led_cdev->trigger) |
206 | led_trigger_set(led_cdev, NULL); |
207 | up_write(&led_cdev->trigger_lock); |
208 | #endif |
209 | |
210 | /* Stop blinking */ |
211 | led_brightness_set(led_cdev, LED_OFF); |
212 | |
213 | device_unregister(led_cdev->dev); |
214 | |
215 | down_write(&leds_list_lock); |
216 | list_del(&led_cdev->node); |
217 | up_write(&leds_list_lock); |
218 | } |
219 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
220 | |
221 | static int __init leds_init(void) |
222 | { |
223 | leds_class = class_create(THIS_MODULE, "leds"); |
224 | if (IS_ERR(leds_class)) |
225 | return PTR_ERR(leds_class); |
226 | leds_class->suspend = led_suspend; |
227 | leds_class->resume = led_resume; |
228 | leds_class->dev_attrs = led_class_attrs; |
229 | return 0; |
230 | } |
231 | |
232 | static void __exit leds_exit(void) |
233 | { |
234 | class_destroy(leds_class); |
235 | } |
236 | |
237 | subsys_initcall(leds_init); |
238 | module_exit(leds_exit); |
239 | |
240 | MODULE_AUTHOR("John Lenz, Richard Purdie"); |
241 | MODULE_LICENSE("GPL"); |
242 | MODULE_DESCRIPTION("LED Class Interface"); |
243 |
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