[SPARC64]: Use in-kernel PROM tree for EBUS and ISA.
[linux-2.6] / drivers / leds / led-class.c
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/ctype.h>
23 #include <linux/leds.h>
24 #include "leds.h"
25
26 static struct class *leds_class;
27
28 static ssize_t led_brightness_show(struct class_device *dev, char *buf)
29 {
30         struct led_classdev *led_cdev = class_get_devdata(dev);
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
40 static ssize_t led_brightness_store(struct class_device *dev,
41                                 const char *buf, size_t size)
42 {
43         struct led_classdev *led_cdev = class_get_devdata(dev);
44         ssize_t ret = -EINVAL;
45         char *after;
46         unsigned long state = simple_strtoul(buf, &after, 10);
47         size_t count = after - buf;
48
49         if (*after && isspace(*after))
50                 count++;
51
52         if (count == size) {
53                 ret = count;
54                 led_set_brightness(led_cdev, state);
55         }
56
57         return ret;
58 }
59
60 static CLASS_DEVICE_ATTR(brightness, 0644, led_brightness_show,
61                         led_brightness_store);
62 #ifdef CONFIG_LEDS_TRIGGERS
63 static CLASS_DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
64 #endif
65
66 /**
67  * led_classdev_suspend - suspend an led_classdev.
68  * @led_cdev: the led_classdev to suspend.
69  */
70 void led_classdev_suspend(struct led_classdev *led_cdev)
71 {
72         led_cdev->flags |= LED_SUSPENDED;
73         led_cdev->brightness_set(led_cdev, 0);
74 }
75 EXPORT_SYMBOL_GPL(led_classdev_suspend);
76
77 /**
78  * led_classdev_resume - resume an led_classdev.
79  * @led_cdev: the led_classdev to resume.
80  */
81 void led_classdev_resume(struct led_classdev *led_cdev)
82 {
83         led_cdev->brightness_set(led_cdev, led_cdev->brightness);
84         led_cdev->flags &= ~LED_SUSPENDED;
85 }
86 EXPORT_SYMBOL_GPL(led_classdev_resume);
87
88 /**
89  * led_classdev_register - register a new object of led_classdev class.
90  * @dev: The device to register.
91  * @led_cdev: the led_classdev structure for this device.
92  */
93 int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
94 {
95         led_cdev->class_dev = class_device_create(leds_class, NULL, 0,
96                                                 parent, "%s", led_cdev->name);
97         if (unlikely(IS_ERR(led_cdev->class_dev)))
98                 return PTR_ERR(led_cdev->class_dev);
99
100         class_set_devdata(led_cdev->class_dev, led_cdev);
101
102         /* register the attributes */
103         class_device_create_file(led_cdev->class_dev,
104                                 &class_device_attr_brightness);
105
106         /* add to the list of leds */
107         write_lock(&leds_list_lock);
108         list_add_tail(&led_cdev->node, &leds_list);
109         write_unlock(&leds_list_lock);
110
111 #ifdef CONFIG_LEDS_TRIGGERS
112         rwlock_init(&led_cdev->trigger_lock);
113
114         led_trigger_set_default(led_cdev);
115
116         class_device_create_file(led_cdev->class_dev,
117                                 &class_device_attr_trigger);
118 #endif
119
120         printk(KERN_INFO "Registered led device: %s\n",
121                         led_cdev->class_dev->class_id);
122
123         return 0;
124 }
125 EXPORT_SYMBOL_GPL(led_classdev_register);
126
127 /**
128  * led_classdev_unregister - unregisters a object of led_properties class.
129  * @led_cdev: the led device to unreigister
130  *
131  * Unregisters a previously registered via led_classdev_register object.
132  */
133 void led_classdev_unregister(struct led_classdev *led_cdev)
134 {
135         class_device_remove_file(led_cdev->class_dev,
136                                 &class_device_attr_brightness);
137 #ifdef CONFIG_LEDS_TRIGGERS
138         class_device_remove_file(led_cdev->class_dev,
139                                 &class_device_attr_trigger);
140         write_lock(&led_cdev->trigger_lock);
141         if (led_cdev->trigger)
142                 led_trigger_set(led_cdev, NULL);
143         write_unlock(&led_cdev->trigger_lock);
144 #endif
145
146         class_device_unregister(led_cdev->class_dev);
147
148         write_lock(&leds_list_lock);
149         list_del(&led_cdev->node);
150         write_unlock(&leds_list_lock);
151 }
152 EXPORT_SYMBOL_GPL(led_classdev_unregister);
153
154 static int __init leds_init(void)
155 {
156         leds_class = class_create(THIS_MODULE, "leds");
157         if (IS_ERR(leds_class))
158                 return PTR_ERR(leds_class);
159         return 0;
160 }
161
162 static void __exit leds_exit(void)
163 {
164         class_destroy(leds_class);
165 }
166
167 subsys_initcall(leds_init);
168 module_exit(leds_exit);
169
170 MODULE_AUTHOR("John Lenz, Richard Purdie");
171 MODULE_LICENSE("GPL");
172 MODULE_DESCRIPTION("LED Class Interface");