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c72a1d60 RP |
1 | /* |
2 | * LED Class Core | |
3 | * | |
4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> | |
f8a7c6fe | 5 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
c72a1d60 RP |
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 | ||
29d76dfa HMH |
27 | static void led_update_brightness(struct led_classdev *led_cdev) |
28 | { | |
29 | if (led_cdev->brightness_get) | |
30 | led_cdev->brightness = led_cdev->brightness_get(led_cdev); | |
31 | } | |
32 | ||
f8a7c6fe RP |
33 | static ssize_t led_brightness_show(struct device *dev, |
34 | struct device_attribute *attr, char *buf) | |
c72a1d60 | 35 | { |
f8a7c6fe | 36 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
37 | |
38 | /* no lock needed for this */ | |
29d76dfa | 39 | led_update_brightness(led_cdev); |
c72a1d60 | 40 | |
dd8e5a20 | 41 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
42 | } |
43 | ||
f8a7c6fe RP |
44 | static ssize_t led_brightness_store(struct device *dev, |
45 | struct device_attribute *attr, const char *buf, size_t size) | |
c72a1d60 | 46 | { |
f8a7c6fe | 47 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
48 | ssize_t ret = -EINVAL; |
49 | char *after; | |
50 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 51 | size_t count = after - buf; |
c72a1d60 | 52 | |
3dc7b82e RP |
53 | if (*after && isspace(*after)) |
54 | count++; | |
55 | ||
56 | if (count == size) { | |
57 | ret = count; | |
0013b23d NM |
58 | |
59 | if (state == LED_OFF) | |
60 | led_trigger_remove(led_cdev); | |
c72a1d60 RP |
61 | led_set_brightness(led_cdev, state); |
62 | } | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
f8a7c6fe | 67 | static DEVICE_ATTR(brightness, 0644, led_brightness_show, led_brightness_store); |
c3bc9956 | 68 | #ifdef CONFIG_LEDS_TRIGGERS |
f8a7c6fe | 69 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
c3bc9956 | 70 | #endif |
c72a1d60 RP |
71 | |
72 | /** | |
73 | * led_classdev_suspend - suspend an led_classdev. | |
74 | * @led_cdev: the led_classdev to suspend. | |
75 | */ | |
76 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
77 | { | |
78 | led_cdev->flags |= LED_SUSPENDED; | |
79 | led_cdev->brightness_set(led_cdev, 0); | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
82 | ||
83 | /** | |
84 | * led_classdev_resume - resume an led_classdev. | |
85 | * @led_cdev: the led_classdev to resume. | |
86 | */ | |
87 | void led_classdev_resume(struct led_classdev *led_cdev) | |
88 | { | |
89 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
90 | led_cdev->flags &= ~LED_SUSPENDED; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
93 | ||
94 | /** | |
95 | * led_classdev_register - register a new object of led_classdev class. | |
96 | * @dev: The device to register. | |
97 | * @led_cdev: the led_classdev structure for this device. | |
98 | */ | |
99 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
100 | { | |
12fda168 JG |
101 | int rc; |
102 | ||
a9b12619 GKH |
103 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
104 | "%s", led_cdev->name); | |
801678c5 | 105 | if (IS_ERR(led_cdev->dev)) |
f8a7c6fe | 106 | return PTR_ERR(led_cdev->dev); |
c72a1d60 | 107 | |
c72a1d60 | 108 | /* register the attributes */ |
f8a7c6fe | 109 | rc = device_create_file(led_cdev->dev, &dev_attr_brightness); |
12fda168 JG |
110 | if (rc) |
111 | goto err_out; | |
c72a1d60 RP |
112 | |
113 | /* add to the list of leds */ | |
72f8da32 | 114 | down_write(&leds_list_lock); |
c72a1d60 | 115 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 116 | up_write(&leds_list_lock); |
c72a1d60 | 117 | |
29d76dfa HMH |
118 | led_update_brightness(led_cdev); |
119 | ||
c3bc9956 | 120 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 121 | init_rwsem(&led_cdev->trigger_lock); |
c3bc9956 | 122 | |
f8a7c6fe | 123 | rc = device_create_file(led_cdev->dev, &dev_attr_trigger); |
12fda168 JG |
124 | if (rc) |
125 | goto err_out_led_list; | |
c3bc9956 | 126 | |
12fda168 | 127 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
128 | #endif |
129 | ||
c72a1d60 | 130 | printk(KERN_INFO "Registered led device: %s\n", |
f8a7c6fe | 131 | led_cdev->name); |
c72a1d60 RP |
132 | |
133 | return 0; | |
12fda168 JG |
134 | |
135 | #ifdef CONFIG_LEDS_TRIGGERS | |
136 | err_out_led_list: | |
f8a7c6fe | 137 | device_remove_file(led_cdev->dev, &dev_attr_brightness); |
12fda168 JG |
138 | list_del(&led_cdev->node); |
139 | #endif | |
140 | err_out: | |
f8a7c6fe | 141 | device_unregister(led_cdev->dev); |
12fda168 | 142 | return rc; |
c72a1d60 RP |
143 | } |
144 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
145 | ||
146 | /** | |
fa23f5cc | 147 | * __led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 148 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
149 | * |
150 | * Unregisters a previously registered via led_classdev_register object. | |
151 | */ | |
b844eba2 | 152 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 153 | { |
f8a7c6fe | 154 | device_remove_file(led_cdev->dev, &dev_attr_brightness); |
c3bc9956 | 155 | #ifdef CONFIG_LEDS_TRIGGERS |
f8a7c6fe | 156 | device_remove_file(led_cdev->dev, &dev_attr_trigger); |
dc47206e | 157 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
158 | if (led_cdev->trigger) |
159 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 160 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 161 | #endif |
c72a1d60 | 162 | |
b844eba2 | 163 | device_unregister(led_cdev->dev); |
c72a1d60 | 164 | |
72f8da32 | 165 | down_write(&leds_list_lock); |
c72a1d60 | 166 | list_del(&led_cdev->node); |
72f8da32 | 167 | up_write(&leds_list_lock); |
c72a1d60 | 168 | } |
b844eba2 | 169 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 RP |
170 | |
171 | static int __init leds_init(void) | |
172 | { | |
173 | leds_class = class_create(THIS_MODULE, "leds"); | |
174 | if (IS_ERR(leds_class)) | |
175 | return PTR_ERR(leds_class); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static void __exit leds_exit(void) | |
180 | { | |
181 | class_destroy(leds_class); | |
182 | } | |
183 | ||
184 | subsys_initcall(leds_init); | |
185 | module_exit(leds_exit); | |
186 | ||
187 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
188 | MODULE_LICENSE("GPL"); | |
189 | MODULE_DESCRIPTION("LED Class Interface"); |