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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 | ||
f8a7c6fe RP |
27 | static ssize_t led_brightness_show(struct device *dev, |
28 | struct device_attribute *attr, char *buf) | |
c72a1d60 | 29 | { |
f8a7c6fe | 30 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
31 | ssize_t ret = 0; |
32 | ||
33 | /* no lock needed for this */ | |
34 | sprintf(buf, "%u\n", led_cdev->brightness); | |
35 | ret = strlen(buf) + 1; | |
36 | ||
37 | return ret; | |
38 | } | |
39 | ||
f8a7c6fe RP |
40 | static ssize_t led_brightness_store(struct device *dev, |
41 | struct device_attribute *attr, const char *buf, size_t size) | |
c72a1d60 | 42 | { |
f8a7c6fe | 43 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
44 | ssize_t ret = -EINVAL; |
45 | char *after; | |
46 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 47 | size_t count = after - buf; |
c72a1d60 | 48 | |
3dc7b82e RP |
49 | if (*after && isspace(*after)) |
50 | count++; | |
51 | ||
52 | if (count == size) { | |
53 | ret = count; | |
c72a1d60 RP |
54 | led_set_brightness(led_cdev, state); |
55 | } | |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
f8a7c6fe | 60 | static DEVICE_ATTR(brightness, 0644, led_brightness_show, led_brightness_store); |
c3bc9956 | 61 | #ifdef CONFIG_LEDS_TRIGGERS |
f8a7c6fe | 62 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
c3bc9956 | 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 | ||
f8a7c6fe RP |
96 | led_cdev->dev = device_create(leds_class, parent, 0, "%s", |
97 | led_cdev->name); | |
98 | if (unlikely(IS_ERR(led_cdev->dev))) | |
99 | return PTR_ERR(led_cdev->dev); | |
c72a1d60 | 100 | |
f8a7c6fe | 101 | dev_set_drvdata(led_cdev->dev, led_cdev); |
c72a1d60 RP |
102 | |
103 | /* register the attributes */ | |
f8a7c6fe | 104 | rc = device_create_file(led_cdev->dev, &dev_attr_brightness); |
12fda168 JG |
105 | if (rc) |
106 | goto err_out; | |
c72a1d60 RP |
107 | |
108 | /* add to the list of leds */ | |
109 | write_lock(&leds_list_lock); | |
110 | list_add_tail(&led_cdev->node, &leds_list); | |
111 | write_unlock(&leds_list_lock); | |
112 | ||
c3bc9956 | 113 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 114 | init_rwsem(&led_cdev->trigger_lock); |
c3bc9956 | 115 | |
f8a7c6fe | 116 | rc = device_create_file(led_cdev->dev, &dev_attr_trigger); |
12fda168 JG |
117 | if (rc) |
118 | goto err_out_led_list; | |
c3bc9956 | 119 | |
12fda168 | 120 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
121 | #endif |
122 | ||
c72a1d60 | 123 | printk(KERN_INFO "Registered led device: %s\n", |
f8a7c6fe | 124 | led_cdev->name); |
c72a1d60 RP |
125 | |
126 | return 0; | |
12fda168 JG |
127 | |
128 | #ifdef CONFIG_LEDS_TRIGGERS | |
129 | err_out_led_list: | |
f8a7c6fe | 130 | device_remove_file(led_cdev->dev, &dev_attr_brightness); |
12fda168 JG |
131 | list_del(&led_cdev->node); |
132 | #endif | |
133 | err_out: | |
f8a7c6fe | 134 | device_unregister(led_cdev->dev); |
12fda168 | 135 | return rc; |
c72a1d60 RP |
136 | } |
137 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
138 | ||
139 | /** | |
140 | * led_classdev_unregister - unregisters a object of led_properties class. | |
70d63ccc | 141 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
142 | * |
143 | * Unregisters a previously registered via led_classdev_register object. | |
144 | */ | |
145 | void led_classdev_unregister(struct led_classdev *led_cdev) | |
146 | { | |
f8a7c6fe | 147 | device_remove_file(led_cdev->dev, &dev_attr_brightness); |
c3bc9956 | 148 | #ifdef CONFIG_LEDS_TRIGGERS |
f8a7c6fe | 149 | device_remove_file(led_cdev->dev, &dev_attr_trigger); |
dc47206e | 150 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
151 | if (led_cdev->trigger) |
152 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 153 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 154 | #endif |
c72a1d60 | 155 | |
f8a7c6fe | 156 | device_unregister(led_cdev->dev); |
c72a1d60 RP |
157 | |
158 | write_lock(&leds_list_lock); | |
159 | list_del(&led_cdev->node); | |
160 | write_unlock(&leds_list_lock); | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(led_classdev_unregister); | |
163 | ||
164 | static int __init leds_init(void) | |
165 | { | |
166 | leds_class = class_create(THIS_MODULE, "leds"); | |
167 | if (IS_ERR(leds_class)) | |
168 | return PTR_ERR(leds_class); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static void __exit leds_exit(void) | |
173 | { | |
174 | class_destroy(leds_class); | |
175 | } | |
176 | ||
177 | subsys_initcall(leds_init); | |
178 | module_exit(leds_exit); | |
179 | ||
180 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
181 | MODULE_LICENSE("GPL"); | |
182 | MODULE_DESCRIPTION("LED Class Interface"); |