4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5 * Copyright (C) 2005-2007 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/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>
21 #include <linux/ctype.h>
22 #include <linux/leds.h>
25 static struct class *leds_class
;
27 static void led_update_brightness(struct led_classdev
*led_cdev
)
29 if (led_cdev
->brightness_get
)
30 led_cdev
->brightness
= led_cdev
->brightness_get(led_cdev
);
33 static ssize_t
led_brightness_show(struct device
*dev
,
34 struct device_attribute
*attr
, char *buf
)
36 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
39 /* no lock needed for this */
40 led_update_brightness(led_cdev
);
41 sprintf(buf
, "%u\n", led_cdev
->brightness
);
42 ret
= strlen(buf
) + 1;
47 static ssize_t
led_brightness_store(struct device
*dev
,
48 struct device_attribute
*attr
, const char *buf
, size_t size
)
50 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
51 ssize_t ret
= -EINVAL
;
53 unsigned long state
= simple_strtoul(buf
, &after
, 10);
54 size_t count
= after
- buf
;
56 if (*after
&& isspace(*after
))
63 led_trigger_remove(led_cdev
);
64 led_set_brightness(led_cdev
, state
);
70 static DEVICE_ATTR(brightness
, 0644, led_brightness_show
, led_brightness_store
);
71 #ifdef CONFIG_LEDS_TRIGGERS
72 static DEVICE_ATTR(trigger
, 0644, led_trigger_show
, led_trigger_store
);
76 * led_classdev_suspend - suspend an led_classdev.
77 * @led_cdev: the led_classdev to suspend.
79 void led_classdev_suspend(struct led_classdev
*led_cdev
)
81 led_cdev
->flags
|= LED_SUSPENDED
;
82 led_cdev
->brightness_set(led_cdev
, 0);
84 EXPORT_SYMBOL_GPL(led_classdev_suspend
);
87 * led_classdev_resume - resume an led_classdev.
88 * @led_cdev: the led_classdev to resume.
90 void led_classdev_resume(struct led_classdev
*led_cdev
)
92 led_cdev
->brightness_set(led_cdev
, led_cdev
->brightness
);
93 led_cdev
->flags
&= ~LED_SUSPENDED
;
95 EXPORT_SYMBOL_GPL(led_classdev_resume
);
98 * led_classdev_register - register a new object of led_classdev class.
99 * @dev: The device to register.
100 * @led_cdev: the led_classdev structure for this device.
102 int led_classdev_register(struct device
*parent
, struct led_classdev
*led_cdev
)
106 led_cdev
->dev
= device_create(leds_class
, parent
, 0, "%s",
108 if (IS_ERR(led_cdev
->dev
))
109 return PTR_ERR(led_cdev
->dev
);
111 dev_set_drvdata(led_cdev
->dev
, led_cdev
);
113 /* register the attributes */
114 rc
= device_create_file(led_cdev
->dev
, &dev_attr_brightness
);
118 /* add to the list of leds */
119 down_write(&leds_list_lock
);
120 list_add_tail(&led_cdev
->node
, &leds_list
);
121 up_write(&leds_list_lock
);
123 led_update_brightness(led_cdev
);
125 #ifdef CONFIG_LEDS_TRIGGERS
126 init_rwsem(&led_cdev
->trigger_lock
);
128 rc
= device_create_file(led_cdev
->dev
, &dev_attr_trigger
);
130 goto err_out_led_list
;
132 led_trigger_set_default(led_cdev
);
135 printk(KERN_INFO
"Registered led device: %s\n",
140 #ifdef CONFIG_LEDS_TRIGGERS
142 device_remove_file(led_cdev
->dev
, &dev_attr_brightness
);
143 list_del(&led_cdev
->node
);
146 device_unregister(led_cdev
->dev
);
149 EXPORT_SYMBOL_GPL(led_classdev_register
);
152 * __led_classdev_unregister - unregisters a object of led_properties class.
153 * @led_cdev: the led device to unregister
155 * Unregisters a previously registered via led_classdev_register object.
157 void led_classdev_unregister(struct led_classdev
*led_cdev
)
159 device_remove_file(led_cdev
->dev
, &dev_attr_brightness
);
160 #ifdef CONFIG_LEDS_TRIGGERS
161 device_remove_file(led_cdev
->dev
, &dev_attr_trigger
);
162 down_write(&led_cdev
->trigger_lock
);
163 if (led_cdev
->trigger
)
164 led_trigger_set(led_cdev
, NULL
);
165 up_write(&led_cdev
->trigger_lock
);
168 device_unregister(led_cdev
->dev
);
170 down_write(&leds_list_lock
);
171 list_del(&led_cdev
->node
);
172 up_write(&leds_list_lock
);
174 EXPORT_SYMBOL_GPL(led_classdev_unregister
);
176 static int __init
leds_init(void)
178 leds_class
= class_create(THIS_MODULE
, "leds");
179 if (IS_ERR(leds_class
))
180 return PTR_ERR(leds_class
);
184 static void __exit
leds_exit(void)
186 class_destroy(leds_class
);
189 subsys_initcall(leds_init
);
190 module_exit(leds_exit
);
192 MODULE_AUTHOR("John Lenz, Richard Purdie");
193 MODULE_LICENSE("GPL");
194 MODULE_DESCRIPTION("LED Class Interface");
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