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 ssize_t
led_max_brightness_show(struct device
*dev
,
68 struct device_attribute
*attr
, char *buf
)
70 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
72 return sprintf(buf
, "%u\n", led_cdev
->max_brightness
);
75 static DEVICE_ATTR(brightness
, 0644, led_brightness_show
, led_brightness_store
);
76 static DEVICE_ATTR(max_brightness
, 0444, led_max_brightness_show
, NULL
);
77 #ifdef CONFIG_LEDS_TRIGGERS
78 static DEVICE_ATTR(trigger
, 0644, led_trigger_show
, led_trigger_store
);
82 * led_classdev_suspend - suspend an led_classdev.
83 * @led_cdev: the led_classdev to suspend.
85 void led_classdev_suspend(struct led_classdev
*led_cdev
)
87 led_cdev
->flags
|= LED_SUSPENDED
;
88 led_cdev
->brightness_set(led_cdev
, 0);
90 EXPORT_SYMBOL_GPL(led_classdev_suspend
);
93 * led_classdev_resume - resume an led_classdev.
94 * @led_cdev: the led_classdev to resume.
96 void led_classdev_resume(struct led_classdev
*led_cdev
)
98 led_cdev
->brightness_set(led_cdev
, led_cdev
->brightness
);
99 led_cdev
->flags
&= ~LED_SUSPENDED
;
101 EXPORT_SYMBOL_GPL(led_classdev_resume
);
103 static int led_suspend(struct device
*dev
, pm_message_t state
)
105 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
107 if (led_cdev
->flags
& LED_CORE_SUSPENDRESUME
)
108 led_classdev_suspend(led_cdev
);
113 static int led_resume(struct device
*dev
)
115 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
117 if (led_cdev
->flags
& LED_CORE_SUSPENDRESUME
)
118 led_classdev_resume(led_cdev
);
124 * led_classdev_register - register a new object of led_classdev class.
125 * @parent: The device to register.
126 * @led_cdev: the led_classdev structure for this device.
128 int led_classdev_register(struct device
*parent
, struct led_classdev
*led_cdev
)
132 led_cdev
->dev
= device_create(leds_class
, parent
, 0, led_cdev
,
133 "%s", led_cdev
->name
);
134 if (IS_ERR(led_cdev
->dev
))
135 return PTR_ERR(led_cdev
->dev
);
137 /* register the attributes */
138 rc
= device_create_file(led_cdev
->dev
, &dev_attr_brightness
);
142 #ifdef CONFIG_LEDS_TRIGGERS
143 init_rwsem(&led_cdev
->trigger_lock
);
145 /* add to the list of leds */
146 down_write(&leds_list_lock
);
147 list_add_tail(&led_cdev
->node
, &leds_list
);
148 up_write(&leds_list_lock
);
150 if (!led_cdev
->max_brightness
)
151 led_cdev
->max_brightness
= LED_FULL
;
153 rc
= device_create_file(led_cdev
->dev
, &dev_attr_max_brightness
);
155 goto err_out_attr_max
;
157 led_update_brightness(led_cdev
);
159 #ifdef CONFIG_LEDS_TRIGGERS
160 rc
= device_create_file(led_cdev
->dev
, &dev_attr_trigger
);
162 goto err_out_led_list
;
164 led_trigger_set_default(led_cdev
);
167 printk(KERN_INFO
"Registered led device: %s\n",
172 #ifdef CONFIG_LEDS_TRIGGERS
174 device_remove_file(led_cdev
->dev
, &dev_attr_max_brightness
);
177 device_remove_file(led_cdev
->dev
, &dev_attr_brightness
);
178 list_del(&led_cdev
->node
);
180 device_unregister(led_cdev
->dev
);
183 EXPORT_SYMBOL_GPL(led_classdev_register
);
186 * led_classdev_unregister - unregisters a object of led_properties class.
187 * @led_cdev: the led device to unregister
189 * Unregisters a previously registered via led_classdev_register object.
191 void led_classdev_unregister(struct led_classdev
*led_cdev
)
193 device_remove_file(led_cdev
->dev
, &dev_attr_max_brightness
);
194 device_remove_file(led_cdev
->dev
, &dev_attr_brightness
);
195 #ifdef CONFIG_LEDS_TRIGGERS
196 device_remove_file(led_cdev
->dev
, &dev_attr_trigger
);
197 down_write(&led_cdev
->trigger_lock
);
198 if (led_cdev
->trigger
)
199 led_trigger_set(led_cdev
, NULL
);
200 up_write(&led_cdev
->trigger_lock
);
203 device_unregister(led_cdev
->dev
);
205 down_write(&leds_list_lock
);
206 list_del(&led_cdev
->node
);
207 up_write(&leds_list_lock
);
209 EXPORT_SYMBOL_GPL(led_classdev_unregister
);
211 static int __init
leds_init(void)
213 leds_class
= class_create(THIS_MODULE
, "leds");
214 if (IS_ERR(leds_class
))
215 return PTR_ERR(leds_class
);
216 leds_class
->suspend
= led_suspend
;
217 leds_class
->resume
= led_resume
;
221 static void __exit
leds_exit(void)
223 class_destroy(leds_class
);
226 subsys_initcall(leds_init
);
227 module_exit(leds_exit
);
229 MODULE_AUTHOR("John Lenz, Richard Purdie");
230 MODULE_LICENSE("GPL");
231 MODULE_DESCRIPTION("LED Class Interface");
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