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 ssize_t led_brightness_show(struct device *dev,
28 struct device_attribute *attr, char *buf)
30 struct led_classdev *led_cdev = dev_get_drvdata(dev);
33 /* no lock needed for this */
34 sprintf(buf, "%u\n", led_cdev->brightness);
35 ret = strlen(buf) + 1;
40 static ssize_t led_brightness_store(struct device *dev,
41 struct device_attribute *attr, const char *buf, size_t size)
43 struct led_classdev *led_cdev = dev_get_drvdata(dev);
44 ssize_t ret = -EINVAL;
46 unsigned long state = simple_strtoul(buf, &after, 10);
47 size_t count = after - buf;
49 if (*after && isspace(*after))
56 led_trigger_remove(led_cdev);
57 led_set_brightness(led_cdev, state);
63 static DEVICE_ATTR(brightness, 0644, led_brightness_show, led_brightness_store);
64 #ifdef CONFIG_LEDS_TRIGGERS
65 static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
69 * led_classdev_suspend - suspend an led_classdev.
70 * @led_cdev: the led_classdev to suspend.
72 void led_classdev_suspend(struct led_classdev *led_cdev)
74 led_cdev->flags |= LED_SUSPENDED;
75 led_cdev->brightness_set(led_cdev, 0);
77 EXPORT_SYMBOL_GPL(led_classdev_suspend);
80 * led_classdev_resume - resume an led_classdev.
81 * @led_cdev: the led_classdev to resume.
83 void led_classdev_resume(struct led_classdev *led_cdev)
85 led_cdev->brightness_set(led_cdev, led_cdev->brightness);
86 led_cdev->flags &= ~LED_SUSPENDED;
88 EXPORT_SYMBOL_GPL(led_classdev_resume);
91 * led_classdev_register - register a new object of led_classdev class.
92 * @dev: The device to register.
93 * @led_cdev: the led_classdev structure for this device.
95 int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
99 led_cdev->dev = device_create(leds_class, parent, 0, "%s",
101 if (unlikely(IS_ERR(led_cdev->dev)))
102 return PTR_ERR(led_cdev->dev);
104 dev_set_drvdata(led_cdev->dev, led_cdev);
106 /* register the attributes */
107 rc = device_create_file(led_cdev->dev, &dev_attr_brightness);
111 /* add to the list of leds */
112 down_write(&leds_list_lock);
113 list_add_tail(&led_cdev->node, &leds_list);
114 up_write(&leds_list_lock);
116 #ifdef CONFIG_LEDS_TRIGGERS
117 init_rwsem(&led_cdev->trigger_lock);
119 rc = device_create_file(led_cdev->dev, &dev_attr_trigger);
121 goto err_out_led_list;
123 led_trigger_set_default(led_cdev);
126 printk(KERN_INFO "Registered led device: %s\n",
131 #ifdef CONFIG_LEDS_TRIGGERS
133 device_remove_file(led_cdev->dev, &dev_attr_brightness);
134 list_del(&led_cdev->node);
137 device_unregister(led_cdev->dev);
140 EXPORT_SYMBOL_GPL(led_classdev_register);
143 * __led_classdev_unregister - unregisters a object of led_properties class.
144 * @led_cdev: the led device to unregister
146 * Unregisters a previously registered via led_classdev_register object.
148 void led_classdev_unregister(struct led_classdev *led_cdev)
150 device_remove_file(led_cdev->dev, &dev_attr_brightness);
151 #ifdef CONFIG_LEDS_TRIGGERS
152 device_remove_file(led_cdev->dev, &dev_attr_trigger);
153 down_write(&led_cdev->trigger_lock);
154 if (led_cdev->trigger)
155 led_trigger_set(led_cdev, NULL);
156 up_write(&led_cdev->trigger_lock);
159 device_unregister(led_cdev->dev);
161 down_write(&leds_list_lock);
162 list_del(&led_cdev->node);
163 up_write(&leds_list_lock);
165 EXPORT_SYMBOL_GPL(led_classdev_unregister);
167 static int __init leds_init(void)
169 leds_class = class_create(THIS_MODULE, "leds");
170 if (IS_ERR(leds_class))
171 return PTR_ERR(leds_class);
175 static void __exit leds_exit(void)
177 class_destroy(leds_class);
180 subsys_initcall(leds_init);
181 module_exit(leds_exit);
183 MODULE_AUTHOR("John Lenz, Richard Purdie");
184 MODULE_LICENSE("GPL");
185 MODULE_DESCRIPTION("LED Class Interface");