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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 | ||
c72a1d60 RP |
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/sysdev.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/err.h> | |
3dc7b82e | 21 | #include <linux/ctype.h> |
c72a1d60 RP |
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); | |
3dc7b82e | 46 | size_t count = after - buf; |
c72a1d60 | 47 | |
3dc7b82e RP |
48 | if (*after && isspace(*after)) |
49 | count++; | |
50 | ||
51 | if (count == size) { | |
52 | ret = count; | |
c72a1d60 RP |
53 | led_set_brightness(led_cdev, state); |
54 | } | |
55 | ||
56 | return ret; | |
57 | } | |
58 | ||
59 | static CLASS_DEVICE_ATTR(brightness, 0644, led_brightness_show, | |
60 | led_brightness_store); | |
c3bc9956 RP |
61 | #ifdef CONFIG_LEDS_TRIGGERS |
62 | static CLASS_DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); | |
63 | #endif | |
c72a1d60 RP |
64 | |
65 | /** | |
66 | * led_classdev_suspend - suspend an led_classdev. | |
67 | * @led_cdev: the led_classdev to suspend. | |
68 | */ | |
69 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
70 | { | |
71 | led_cdev->flags |= LED_SUSPENDED; | |
72 | led_cdev->brightness_set(led_cdev, 0); | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
75 | ||
76 | /** | |
77 | * led_classdev_resume - resume an led_classdev. | |
78 | * @led_cdev: the led_classdev to resume. | |
79 | */ | |
80 | void led_classdev_resume(struct led_classdev *led_cdev) | |
81 | { | |
82 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
83 | led_cdev->flags &= ~LED_SUSPENDED; | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
86 | ||
87 | /** | |
88 | * led_classdev_register - register a new object of led_classdev class. | |
89 | * @dev: The device to register. | |
90 | * @led_cdev: the led_classdev structure for this device. | |
91 | */ | |
92 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
93 | { | |
12fda168 JG |
94 | int rc; |
95 | ||
c72a1d60 RP |
96 | led_cdev->class_dev = class_device_create(leds_class, NULL, 0, |
97 | parent, "%s", led_cdev->name); | |
98 | if (unlikely(IS_ERR(led_cdev->class_dev))) | |
99 | return PTR_ERR(led_cdev->class_dev); | |
100 | ||
101 | class_set_devdata(led_cdev->class_dev, led_cdev); | |
102 | ||
103 | /* register the attributes */ | |
12fda168 JG |
104 | rc = class_device_create_file(led_cdev->class_dev, |
105 | &class_device_attr_brightness); | |
106 | if (rc) | |
107 | goto err_out; | |
c72a1d60 RP |
108 | |
109 | /* add to the list of leds */ | |
110 | write_lock(&leds_list_lock); | |
111 | list_add_tail(&led_cdev->node, &leds_list); | |
112 | write_unlock(&leds_list_lock); | |
113 | ||
c3bc9956 RP |
114 | #ifdef CONFIG_LEDS_TRIGGERS |
115 | rwlock_init(&led_cdev->trigger_lock); | |
116 | ||
12fda168 JG |
117 | rc = class_device_create_file(led_cdev->class_dev, |
118 | &class_device_attr_trigger); | |
119 | if (rc) | |
120 | goto err_out_led_list; | |
c3bc9956 | 121 | |
12fda168 | 122 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
123 | #endif |
124 | ||
c72a1d60 RP |
125 | printk(KERN_INFO "Registered led device: %s\n", |
126 | led_cdev->class_dev->class_id); | |
127 | ||
128 | return 0; | |
12fda168 JG |
129 | |
130 | #ifdef CONFIG_LEDS_TRIGGERS | |
131 | err_out_led_list: | |
132 | class_device_remove_file(led_cdev->class_dev, | |
133 | &class_device_attr_brightness); | |
134 | list_del(&led_cdev->node); | |
135 | #endif | |
136 | err_out: | |
137 | class_device_unregister(led_cdev->class_dev); | |
138 | return rc; | |
c72a1d60 RP |
139 | } |
140 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
141 | ||
142 | /** | |
143 | * led_classdev_unregister - unregisters a object of led_properties class. | |
70d63ccc | 144 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
145 | * |
146 | * Unregisters a previously registered via led_classdev_register object. | |
147 | */ | |
148 | void led_classdev_unregister(struct led_classdev *led_cdev) | |
149 | { | |
150 | class_device_remove_file(led_cdev->class_dev, | |
151 | &class_device_attr_brightness); | |
c3bc9956 RP |
152 | #ifdef CONFIG_LEDS_TRIGGERS |
153 | class_device_remove_file(led_cdev->class_dev, | |
154 | &class_device_attr_trigger); | |
155 | write_lock(&led_cdev->trigger_lock); | |
156 | if (led_cdev->trigger) | |
157 | led_trigger_set(led_cdev, NULL); | |
158 | write_unlock(&led_cdev->trigger_lock); | |
159 | #endif | |
c72a1d60 RP |
160 | |
161 | class_device_unregister(led_cdev->class_dev); | |
162 | ||
163 | write_lock(&leds_list_lock); | |
164 | list_del(&led_cdev->node); | |
165 | write_unlock(&leds_list_lock); | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(led_classdev_unregister); | |
168 | ||
169 | static int __init leds_init(void) | |
170 | { | |
171 | leds_class = class_create(THIS_MODULE, "leds"); | |
172 | if (IS_ERR(leds_class)) | |
173 | return PTR_ERR(leds_class); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static void __exit leds_exit(void) | |
178 | { | |
179 | class_destroy(leds_class); | |
180 | } | |
181 | ||
182 | subsys_initcall(leds_init); | |
183 | module_exit(leds_exit); | |
184 | ||
185 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
186 | MODULE_LICENSE("GPL"); | |
187 | MODULE_DESCRIPTION("LED Class Interface"); |