Commit | Line | Data |
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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); | |
57 | ||
58 | /** | |
59 | * led_classdev_suspend - suspend an led_classdev. | |
60 | * @led_cdev: the led_classdev to suspend. | |
61 | */ | |
62 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
63 | { | |
64 | led_cdev->flags |= LED_SUSPENDED; | |
65 | led_cdev->brightness_set(led_cdev, 0); | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
68 | ||
69 | /** | |
70 | * led_classdev_resume - resume an led_classdev. | |
71 | * @led_cdev: the led_classdev to resume. | |
72 | */ | |
73 | void led_classdev_resume(struct led_classdev *led_cdev) | |
74 | { | |
75 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
76 | led_cdev->flags &= ~LED_SUSPENDED; | |
77 | } | |
78 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
79 | ||
80 | /** | |
81 | * led_classdev_register - register a new object of led_classdev class. | |
82 | * @dev: The device to register. | |
83 | * @led_cdev: the led_classdev structure for this device. | |
84 | */ | |
85 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
86 | { | |
87 | led_cdev->class_dev = class_device_create(leds_class, NULL, 0, | |
88 | parent, "%s", led_cdev->name); | |
89 | if (unlikely(IS_ERR(led_cdev->class_dev))) | |
90 | return PTR_ERR(led_cdev->class_dev); | |
91 | ||
92 | class_set_devdata(led_cdev->class_dev, led_cdev); | |
93 | ||
94 | /* register the attributes */ | |
95 | class_device_create_file(led_cdev->class_dev, | |
96 | &class_device_attr_brightness); | |
97 | ||
98 | /* add to the list of leds */ | |
99 | write_lock(&leds_list_lock); | |
100 | list_add_tail(&led_cdev->node, &leds_list); | |
101 | write_unlock(&leds_list_lock); | |
102 | ||
103 | printk(KERN_INFO "Registered led device: %s\n", | |
104 | led_cdev->class_dev->class_id); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
109 | ||
110 | /** | |
111 | * led_classdev_unregister - unregisters a object of led_properties class. | |
112 | * @led_cdev: the led device to unreigister | |
113 | * | |
114 | * Unregisters a previously registered via led_classdev_register object. | |
115 | */ | |
116 | void led_classdev_unregister(struct led_classdev *led_cdev) | |
117 | { | |
118 | class_device_remove_file(led_cdev->class_dev, | |
119 | &class_device_attr_brightness); | |
120 | ||
121 | class_device_unregister(led_cdev->class_dev); | |
122 | ||
123 | write_lock(&leds_list_lock); | |
124 | list_del(&led_cdev->node); | |
125 | write_unlock(&leds_list_lock); | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(led_classdev_unregister); | |
128 | ||
129 | static int __init leds_init(void) | |
130 | { | |
131 | leds_class = class_create(THIS_MODULE, "leds"); | |
132 | if (IS_ERR(leds_class)) | |
133 | return PTR_ERR(leds_class); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static void __exit leds_exit(void) | |
138 | { | |
139 | class_destroy(leds_class); | |
140 | } | |
141 | ||
142 | subsys_initcall(leds_init); | |
143 | module_exit(leds_exit); | |
144 | ||
145 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
146 | MODULE_LICENSE("GPL"); | |
147 | MODULE_DESCRIPTION("LED Class Interface"); |