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
);
38 /* no lock needed for this */
39 led_update_brightness(led_cdev
);
41 return sprintf(buf
, "%u\n", led_cdev
->brightness
);
44 static ssize_t
led_brightness_store(struct device
*dev
,
45 struct device_attribute
*attr
, const char *buf
, size_t size
)
47 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
48 ssize_t ret
= -EINVAL
;
50 unsigned long state
= simple_strtoul(buf
, &after
, 10);
51 size_t count
= after
- buf
;
53 if (*after
&& isspace(*after
))
60 led_trigger_remove(led_cdev
);
61 led_set_brightness(led_cdev
, state
);
67 static DEVICE_ATTR(brightness
, 0644, led_brightness_show
, led_brightness_store
);
68 #ifdef CONFIG_LEDS_TRIGGERS
69 static DEVICE_ATTR(trigger
, 0644, led_trigger_show
, led_trigger_store
);
73 * led_classdev_suspend - suspend an led_classdev.
74 * @led_cdev: the led_classdev to suspend.
76 void led_classdev_suspend(struct led_classdev
*led_cdev
)
78 led_cdev
->flags
|= LED_SUSPENDED
;
79 led_cdev
->brightness_set(led_cdev
, 0);
81 EXPORT_SYMBOL_GPL(led_classdev_suspend
);
84 * led_classdev_resume - resume an led_classdev.
85 * @led_cdev: the led_classdev to resume.
87 void led_classdev_resume(struct led_classdev
*led_cdev
)
89 led_cdev
->brightness_set(led_cdev
, led_cdev
->brightness
);
90 led_cdev
->flags
&= ~LED_SUSPENDED
;
92 EXPORT_SYMBOL_GPL(led_classdev_resume
);
94 static int led_suspend(struct device
*dev
, pm_message_t state
)
96 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
98 if (led_cdev
->flags
& LED_CORE_SUSPENDRESUME
)
99 led_classdev_suspend(led_cdev
);
104 static int led_resume(struct device
*dev
)
106 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
108 if (led_cdev
->flags
& LED_CORE_SUSPENDRESUME
)
109 led_classdev_resume(led_cdev
);
115 * led_classdev_register - register a new object of led_classdev class.
116 * @parent: The device to register.
117 * @led_cdev: the led_classdev structure for this device.
119 int led_classdev_register(struct device
*parent
, struct led_classdev
*led_cdev
)
123 led_cdev
->dev
= device_create(leds_class
, parent
, 0, led_cdev
,
124 "%s", led_cdev
->name
);
125 if (IS_ERR(led_cdev
->dev
))
126 return PTR_ERR(led_cdev
->dev
);
128 /* register the attributes */
129 rc
= device_create_file(led_cdev
->dev
, &dev_attr_brightness
);
133 #ifdef CONFIG_LEDS_TRIGGERS
134 init_rwsem(&led_cdev
->trigger_lock
);
136 /* add to the list of leds */
137 down_write(&leds_list_lock
);
138 list_add_tail(&led_cdev
->node
, &leds_list
);
139 up_write(&leds_list_lock
);
141 led_update_brightness(led_cdev
);
143 #ifdef CONFIG_LEDS_TRIGGERS
144 rc
= device_create_file(led_cdev
->dev
, &dev_attr_trigger
);
146 goto err_out_led_list
;
148 led_trigger_set_default(led_cdev
);
151 printk(KERN_INFO
"Registered led device: %s\n",
156 #ifdef CONFIG_LEDS_TRIGGERS
158 device_remove_file(led_cdev
->dev
, &dev_attr_brightness
);
159 list_del(&led_cdev
->node
);
162 device_unregister(led_cdev
->dev
);
165 EXPORT_SYMBOL_GPL(led_classdev_register
);
168 * led_classdev_unregister - unregisters a object of led_properties class.
169 * @led_cdev: the led device to unregister
171 * Unregisters a previously registered via led_classdev_register object.
173 void led_classdev_unregister(struct led_classdev
*led_cdev
)
175 device_remove_file(led_cdev
->dev
, &dev_attr_brightness
);
176 #ifdef CONFIG_LEDS_TRIGGERS
177 device_remove_file(led_cdev
->dev
, &dev_attr_trigger
);
178 down_write(&led_cdev
->trigger_lock
);
179 if (led_cdev
->trigger
)
180 led_trigger_set(led_cdev
, NULL
);
181 up_write(&led_cdev
->trigger_lock
);
184 device_unregister(led_cdev
->dev
);
186 down_write(&leds_list_lock
);
187 list_del(&led_cdev
->node
);
188 up_write(&leds_list_lock
);
190 EXPORT_SYMBOL_GPL(led_classdev_unregister
);
192 static int __init
leds_init(void)
194 leds_class
= class_create(THIS_MODULE
, "leds");
195 if (IS_ERR(leds_class
))
196 return PTR_ERR(leds_class
);
197 leds_class
->suspend
= led_suspend
;
198 leds_class
->resume
= led_resume
;
202 static void __exit
leds_exit(void)
204 class_destroy(leds_class
);
207 subsys_initcall(leds_init
);
208 module_exit(leds_exit
);
210 MODULE_AUTHOR("John Lenz, Richard Purdie");
211 MODULE_LICENSE("GPL");
212 MODULE_DESCRIPTION("LED Class Interface");
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