]>
Commit | Line | Data |
---|---|---|
c72a1d60 RP |
1 | /* |
2 | * LED Class Core | |
3 | * | |
4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> | |
5 | * Copyright (C) 2005-2006 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/config.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/sysdev.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/leds.h> | |
23 | #include "leds.h" | |
24 | ||
25 | static struct class *leds_class; | |
26 | ||
27 | static ssize_t led_brightness_show(struct class_device *dev, char *buf) | |
28 | { | |
29 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
30 | ssize_t ret = 0; | |
31 | ||
32 | /* no lock needed for this */ | |
33 | sprintf(buf, "%u\n", led_cdev->brightness); | |
34 | ret = strlen(buf) + 1; | |
35 | ||
36 | return ret; | |
37 | } | |
38 | ||
39 | static ssize_t led_brightness_store(struct class_device *dev, | |
40 | const char *buf, size_t size) | |
41 | { | |
42 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
43 | ssize_t ret = -EINVAL; | |
44 | char *after; | |
45 | unsigned long state = simple_strtoul(buf, &after, 10); | |
46 | ||
47 | if (after - buf > 0) { | |
48 | ret = after - buf; | |
49 | led_set_brightness(led_cdev, state); | |
50 | } | |
51 | ||
52 | return ret; | |
53 | } | |
54 | ||
55 | static CLASS_DEVICE_ATTR(brightness, 0644, led_brightness_show, | |
56 | led_brightness_store); | |
c3bc9956 RP |
57 | #ifdef CONFIG_LEDS_TRIGGERS |
58 | static CLASS_DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); | |
59 | #endif | |
c72a1d60 RP |
60 | |
61 | /** | |
62 | * led_classdev_suspend - suspend an led_classdev. | |
63 | * @led_cdev: the led_classdev to suspend. | |
64 | */ | |
65 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
66 | { | |
67 | led_cdev->flags |= LED_SUSPENDED; | |
68 | led_cdev->brightness_set(led_cdev, 0); | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
71 | ||
72 | /** | |
73 | * led_classdev_resume - resume an led_classdev. | |
74 | * @led_cdev: the led_classdev to resume. | |
75 | */ | |
76 | void led_classdev_resume(struct led_classdev *led_cdev) | |
77 | { | |
78 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
79 | led_cdev->flags &= ~LED_SUSPENDED; | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
82 | ||
83 | /** | |
84 | * led_classdev_register - register a new object of led_classdev class. | |
85 | * @dev: The device to register. | |
86 | * @led_cdev: the led_classdev structure for this device. | |
87 | */ | |
88 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
89 | { | |
90 | led_cdev->class_dev = class_device_create(leds_class, NULL, 0, | |
91 | parent, "%s", led_cdev->name); | |
92 | if (unlikely(IS_ERR(led_cdev->class_dev))) | |
93 | return PTR_ERR(led_cdev->class_dev); | |
94 | ||
95 | class_set_devdata(led_cdev->class_dev, led_cdev); | |
96 | ||
97 | /* register the attributes */ | |
98 | class_device_create_file(led_cdev->class_dev, | |
99 | &class_device_attr_brightness); | |
100 | ||
101 | /* add to the list of leds */ | |
102 | write_lock(&leds_list_lock); | |
103 | list_add_tail(&led_cdev->node, &leds_list); | |
104 | write_unlock(&leds_list_lock); | |
105 | ||
c3bc9956 RP |
106 | #ifdef CONFIG_LEDS_TRIGGERS |
107 | rwlock_init(&led_cdev->trigger_lock); | |
108 | ||
109 | led_trigger_set_default(led_cdev); | |
110 | ||
111 | class_device_create_file(led_cdev->class_dev, | |
112 | &class_device_attr_trigger); | |
113 | #endif | |
114 | ||
c72a1d60 RP |
115 | printk(KERN_INFO "Registered led device: %s\n", |
116 | led_cdev->class_dev->class_id); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
121 | ||
122 | /** | |
123 | * led_classdev_unregister - unregisters a object of led_properties class. | |
124 | * @led_cdev: the led device to unreigister | |
125 | * | |
126 | * Unregisters a previously registered via led_classdev_register object. | |
127 | */ | |
128 | void led_classdev_unregister(struct led_classdev *led_cdev) | |
129 | { | |
130 | class_device_remove_file(led_cdev->class_dev, | |
131 | &class_device_attr_brightness); | |
c3bc9956 RP |
132 | #ifdef CONFIG_LEDS_TRIGGERS |
133 | class_device_remove_file(led_cdev->class_dev, | |
134 | &class_device_attr_trigger); | |
135 | write_lock(&led_cdev->trigger_lock); | |
136 | if (led_cdev->trigger) | |
137 | led_trigger_set(led_cdev, NULL); | |
138 | write_unlock(&led_cdev->trigger_lock); | |
139 | #endif | |
c72a1d60 RP |
140 | |
141 | class_device_unregister(led_cdev->class_dev); | |
142 | ||
143 | write_lock(&leds_list_lock); | |
144 | list_del(&led_cdev->node); | |
145 | write_unlock(&leds_list_lock); | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(led_classdev_unregister); | |
148 | ||
149 | static int __init leds_init(void) | |
150 | { | |
151 | leds_class = class_create(THIS_MODULE, "leds"); | |
152 | if (IS_ERR(leds_class)) | |
153 | return PTR_ERR(leds_class); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static void __exit leds_exit(void) | |
158 | { | |
159 | class_destroy(leds_class); | |
160 | } | |
161 | ||
162 | subsys_initcall(leds_init); | |
163 | module_exit(leds_exit); | |
164 | ||
165 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
166 | MODULE_LICENSE("GPL"); | |
167 | MODULE_DESCRIPTION("LED Class Interface"); |