4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5 * Copyright (C) 2005-2006 Richard Purdie <rpurdie@openedhand.com>
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.
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>
25 static struct class *leds_class
;
27 static ssize_t
led_brightness_show(struct class_device
*dev
, char *buf
)
29 struct led_classdev
*led_cdev
= class_get_devdata(dev
);
32 /* no lock needed for this */
33 sprintf(buf
, "%u\n", led_cdev
->brightness
);
34 ret
= strlen(buf
) + 1;
39 static ssize_t
led_brightness_store(struct class_device
*dev
,
40 const char *buf
, size_t size
)
42 struct led_classdev
*led_cdev
= class_get_devdata(dev
);
43 ssize_t ret
= -EINVAL
;
45 unsigned long state
= simple_strtoul(buf
, &after
, 10);
47 if (after
- buf
> 0) {
49 led_set_brightness(led_cdev
, state
);
55 static CLASS_DEVICE_ATTR(brightness
, 0644, led_brightness_show
,
56 led_brightness_store
);
57 #ifdef CONFIG_LEDS_TRIGGERS
58 static CLASS_DEVICE_ATTR(trigger
, 0644, led_trigger_show
, led_trigger_store
);
62 * led_classdev_suspend - suspend an led_classdev.
63 * @led_cdev: the led_classdev to suspend.
65 void led_classdev_suspend(struct led_classdev
*led_cdev
)
67 led_cdev
->flags
|= LED_SUSPENDED
;
68 led_cdev
->brightness_set(led_cdev
, 0);
70 EXPORT_SYMBOL_GPL(led_classdev_suspend
);
73 * led_classdev_resume - resume an led_classdev.
74 * @led_cdev: the led_classdev to resume.
76 void led_classdev_resume(struct led_classdev
*led_cdev
)
78 led_cdev
->brightness_set(led_cdev
, led_cdev
->brightness
);
79 led_cdev
->flags
&= ~LED_SUSPENDED
;
81 EXPORT_SYMBOL_GPL(led_classdev_resume
);
84 * led_classdev_register - register a new object of led_classdev class.
85 * @dev: The device to register.
86 * @led_cdev: the led_classdev structure for this device.
88 int led_classdev_register(struct device
*parent
, struct led_classdev
*led_cdev
)
90 led_cdev
->class_dev
= class_device_create(leds_class
, NULL
, 0,
91 parent
, "%s", led_cdev
->name
);
92 if (unlikely(IS_ERR(led_cdev
->class_dev
)))
93 return PTR_ERR(led_cdev
->class_dev
);
95 class_set_devdata(led_cdev
->class_dev
, led_cdev
);
97 /* register the attributes */
98 class_device_create_file(led_cdev
->class_dev
,
99 &class_device_attr_brightness
);
101 /* add to the list of leds */
102 write_lock(&leds_list_lock
);
103 list_add_tail(&led_cdev
->node
, &leds_list
);
104 write_unlock(&leds_list_lock
);
106 #ifdef CONFIG_LEDS_TRIGGERS
107 rwlock_init(&led_cdev
->trigger_lock
);
109 led_trigger_set_default(led_cdev
);
111 class_device_create_file(led_cdev
->class_dev
,
112 &class_device_attr_trigger
);
115 printk(KERN_INFO
"Registered led device: %s\n",
116 led_cdev
->class_dev
->class_id
);
120 EXPORT_SYMBOL_GPL(led_classdev_register
);
123 * led_classdev_unregister - unregisters a object of led_properties class.
124 * @led_cdev: the led device to unreigister
126 * Unregisters a previously registered via led_classdev_register object.
128 void led_classdev_unregister(struct led_classdev
*led_cdev
)
130 class_device_remove_file(led_cdev
->class_dev
,
131 &class_device_attr_brightness
);
132 #ifdef CONFIG_LEDS_TRIGGERS
133 class_device_remove_file(led_cdev
->class_dev
,
134 &class_device_attr_trigger
);
135 write_lock(&led_cdev
->trigger_lock
);
136 if (led_cdev
->trigger
)
137 led_trigger_set(led_cdev
, NULL
);
138 write_unlock(&led_cdev
->trigger_lock
);
141 class_device_unregister(led_cdev
->class_dev
);
143 write_lock(&leds_list_lock
);
144 list_del(&led_cdev
->node
);
145 write_unlock(&leds_list_lock
);
147 EXPORT_SYMBOL_GPL(led_classdev_unregister
);
149 static int __init
leds_init(void)
151 leds_class
= class_create(THIS_MODULE
, "leds");
152 if (IS_ERR(leds_class
))
153 return PTR_ERR(leds_class
);
157 static void __exit
leds_exit(void)
159 class_destroy(leds_class
);
162 subsys_initcall(leds_init
);
163 module_exit(leds_exit
);
165 MODULE_AUTHOR("John Lenz, Richard Purdie");
166 MODULE_LICENSE("GPL");
167 MODULE_DESCRIPTION("LED Class Interface");