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Richard Purdiec72a1d62006-03-31 02:31:04 -08001/*
2 * LED Class Core
3 *
4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
Richard Purdief8a7c6f2007-07-08 23:19:31 +01005 * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
Richard Purdiec72a1d62006-03-31 02:31:04 -08006 *
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.
10 */
11
Richard Purdiec72a1d62006-03-31 02:31:04 -080012#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>
Richard Purdie3dc7b822006-05-15 09:44:17 -070021#include <linux/ctype.h>
Richard Purdiec72a1d62006-03-31 02:31:04 -080022#include <linux/leds.h>
23#include "leds.h"
24
25static struct class *leds_class;
26
Henrique de Moraes Holschuh29d76df2008-03-18 09:47:48 +000027static void led_update_brightness(struct led_classdev *led_cdev)
28{
29 if (led_cdev->brightness_get)
30 led_cdev->brightness = led_cdev->brightness_get(led_cdev);
31}
32
Richard Purdief8a7c6f2007-07-08 23:19:31 +010033static ssize_t led_brightness_show(struct device *dev,
34 struct device_attribute *attr, char *buf)
Richard Purdiec72a1d62006-03-31 02:31:04 -080035{
Richard Purdief8a7c6f2007-07-08 23:19:31 +010036 struct led_classdev *led_cdev = dev_get_drvdata(dev);
Richard Purdiec72a1d62006-03-31 02:31:04 -080037
38 /* no lock needed for this */
Henrique de Moraes Holschuh29d76df2008-03-18 09:47:48 +000039 led_update_brightness(led_cdev);
Richard Purdiec72a1d62006-03-31 02:31:04 -080040
Sven Wegenerdd8e5a22008-10-13 10:41:39 +010041 return sprintf(buf, "%u\n", led_cdev->brightness);
Richard Purdiec72a1d62006-03-31 02:31:04 -080042}
43
Richard Purdief8a7c6f2007-07-08 23:19:31 +010044static ssize_t led_brightness_store(struct device *dev,
45 struct device_attribute *attr, const char *buf, size_t size)
Richard Purdiec72a1d62006-03-31 02:31:04 -080046{
Richard Purdief8a7c6f2007-07-08 23:19:31 +010047 struct led_classdev *led_cdev = dev_get_drvdata(dev);
Richard Purdiec72a1d62006-03-31 02:31:04 -080048 ssize_t ret = -EINVAL;
49 char *after;
50 unsigned long state = simple_strtoul(buf, &after, 10);
Richard Purdie3dc7b822006-05-15 09:44:17 -070051 size_t count = after - buf;
Richard Purdiec72a1d62006-03-31 02:31:04 -080052
André Goddard Rosae7d28602009-12-14 18:01:06 -080053 if (isspace(*after))
Richard Purdie3dc7b822006-05-15 09:44:17 -070054 count++;
55
56 if (count == size) {
57 ret = count;
Németh Márton0013b232008-03-09 20:54:37 +000058
59 if (state == LED_OFF)
60 led_trigger_remove(led_cdev);
Richard Purdiec72a1d62006-03-31 02:31:04 -080061 led_set_brightness(led_cdev, state);
62 }
63
64 return ret;
65}
66
Guennadi Liakhovetski1bd465e2009-01-10 18:54:39 +000067static ssize_t led_max_brightness_show(struct device *dev,
68 struct device_attribute *attr, char *buf)
69{
70 struct led_classdev *led_cdev = dev_get_drvdata(dev);
71
72 return sprintf(buf, "%u\n", led_cdev->max_brightness);
73}
74
Richard Purdief8a7c6f2007-07-08 23:19:31 +010075static DEVICE_ATTR(brightness, 0644, led_brightness_show, led_brightness_store);
Guennadi Liakhovetski1bd465e2009-01-10 18:54:39 +000076static DEVICE_ATTR(max_brightness, 0444, led_max_brightness_show, NULL);
Richard Purdiec3bc9952006-03-31 02:31:05 -080077#ifdef CONFIG_LEDS_TRIGGERS
Richard Purdief8a7c6f2007-07-08 23:19:31 +010078static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
Richard Purdiec3bc9952006-03-31 02:31:05 -080079#endif
Richard Purdiec72a1d62006-03-31 02:31:04 -080080
81/**
82 * led_classdev_suspend - suspend an led_classdev.
83 * @led_cdev: the led_classdev to suspend.
84 */
85void led_classdev_suspend(struct led_classdev *led_cdev)
86{
87 led_cdev->flags |= LED_SUSPENDED;
88 led_cdev->brightness_set(led_cdev, 0);
89}
90EXPORT_SYMBOL_GPL(led_classdev_suspend);
91
92/**
93 * led_classdev_resume - resume an led_classdev.
94 * @led_cdev: the led_classdev to resume.
95 */
96void led_classdev_resume(struct led_classdev *led_cdev)
97{
98 led_cdev->brightness_set(led_cdev, led_cdev->brightness);
99 led_cdev->flags &= ~LED_SUSPENDED;
100}
101EXPORT_SYMBOL_GPL(led_classdev_resume);
102
Richard Purdie859cb7f2009-01-08 17:55:03 +0000103static int led_suspend(struct device *dev, pm_message_t state)
104{
105 struct led_classdev *led_cdev = dev_get_drvdata(dev);
106
107 if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
108 led_classdev_suspend(led_cdev);
109
110 return 0;
111}
112
113static int led_resume(struct device *dev)
114{
115 struct led_classdev *led_cdev = dev_get_drvdata(dev);
116
117 if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
118 led_classdev_resume(led_cdev);
119
120 return 0;
121}
122
Richard Purdiec72a1d62006-03-31 02:31:04 -0800123/**
124 * led_classdev_register - register a new object of led_classdev class.
Sven Wegenerff8649a2008-12-03 08:04:57 +0000125 * @parent: The device to register.
Richard Purdiec72a1d62006-03-31 02:31:04 -0800126 * @led_cdev: the led_classdev structure for this device.
127 */
128int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
129{
Jeff Garzik12fda162006-10-17 00:10:20 -0700130 int rc;
131
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700132 led_cdev->dev = device_create(leds_class, parent, 0, led_cdev,
133 "%s", led_cdev->name);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -0700134 if (IS_ERR(led_cdev->dev))
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100135 return PTR_ERR(led_cdev->dev);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800136
Richard Purdiec72a1d62006-03-31 02:31:04 -0800137 /* register the attributes */
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100138 rc = device_create_file(led_cdev->dev, &dev_attr_brightness);
Jeff Garzik12fda162006-10-17 00:10:20 -0700139 if (rc)
140 goto err_out;
Richard Purdiec72a1d62006-03-31 02:31:04 -0800141
Richard Purdie270c3952008-10-20 23:16:17 +0100142#ifdef CONFIG_LEDS_TRIGGERS
143 init_rwsem(&led_cdev->trigger_lock);
144#endif
Richard Purdiec72a1d62006-03-31 02:31:04 -0800145 /* add to the list of leds */
Richard Purdie72f8da32007-12-31 23:09:44 +0000146 down_write(&leds_list_lock);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800147 list_add_tail(&led_cdev->node, &leds_list);
Richard Purdie72f8da32007-12-31 23:09:44 +0000148 up_write(&leds_list_lock);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800149
Guennadi Liakhovetski1bd465e2009-01-10 18:54:39 +0000150 if (!led_cdev->max_brightness)
151 led_cdev->max_brightness = LED_FULL;
152
153 rc = device_create_file(led_cdev->dev, &dev_attr_max_brightness);
154 if (rc)
155 goto err_out_attr_max;
156
Henrique de Moraes Holschuh29d76df2008-03-18 09:47:48 +0000157 led_update_brightness(led_cdev);
158
Richard Purdiec3bc9952006-03-31 02:31:05 -0800159#ifdef CONFIG_LEDS_TRIGGERS
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100160 rc = device_create_file(led_cdev->dev, &dev_attr_trigger);
Jeff Garzik12fda162006-10-17 00:10:20 -0700161 if (rc)
162 goto err_out_led_list;
Richard Purdiec3bc9952006-03-31 02:31:05 -0800163
Jeff Garzik12fda162006-10-17 00:10:20 -0700164 led_trigger_set_default(led_cdev);
Richard Purdiec3bc9952006-03-31 02:31:05 -0800165#endif
166
Richard Purdiec72a1d62006-03-31 02:31:04 -0800167 printk(KERN_INFO "Registered led device: %s\n",
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100168 led_cdev->name);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800169
170 return 0;
Jeff Garzik12fda162006-10-17 00:10:20 -0700171
172#ifdef CONFIG_LEDS_TRIGGERS
173err_out_led_list:
Guennadi Liakhovetski1bd465e2009-01-10 18:54:39 +0000174 device_remove_file(led_cdev->dev, &dev_attr_max_brightness);
175#endif
176err_out_attr_max:
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100177 device_remove_file(led_cdev->dev, &dev_attr_brightness);
Jeff Garzik12fda162006-10-17 00:10:20 -0700178 list_del(&led_cdev->node);
Jeff Garzik12fda162006-10-17 00:10:20 -0700179err_out:
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100180 device_unregister(led_cdev->dev);
Jeff Garzik12fda162006-10-17 00:10:20 -0700181 return rc;
Richard Purdiec72a1d62006-03-31 02:31:04 -0800182}
183EXPORT_SYMBOL_GPL(led_classdev_register);
184
185/**
Qinghuang Feng0266a452008-10-20 23:04:36 +0100186 * led_classdev_unregister - unregisters a object of led_properties class.
Henrik Kretzschmar70d63cc2006-10-03 23:31:30 +0200187 * @led_cdev: the led device to unregister
Richard Purdiec72a1d62006-03-31 02:31:04 -0800188 *
189 * Unregisters a previously registered via led_classdev_register object.
190 */
Rafael J. Wysockib844eba2008-03-23 20:28:24 +0100191void led_classdev_unregister(struct led_classdev *led_cdev)
Richard Purdiec72a1d62006-03-31 02:31:04 -0800192{
Guennadi Liakhovetski1bd465e2009-01-10 18:54:39 +0000193 device_remove_file(led_cdev->dev, &dev_attr_max_brightness);
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100194 device_remove_file(led_cdev->dev, &dev_attr_brightness);
Richard Purdiec3bc9952006-03-31 02:31:05 -0800195#ifdef CONFIG_LEDS_TRIGGERS
Richard Purdief8a7c6f2007-07-08 23:19:31 +0100196 device_remove_file(led_cdev->dev, &dev_attr_trigger);
Richard Purdiedc472062007-11-10 13:29:04 +0000197 down_write(&led_cdev->trigger_lock);
Richard Purdiec3bc9952006-03-31 02:31:05 -0800198 if (led_cdev->trigger)
199 led_trigger_set(led_cdev, NULL);
Richard Purdiedc472062007-11-10 13:29:04 +0000200 up_write(&led_cdev->trigger_lock);
Richard Purdiec3bc9952006-03-31 02:31:05 -0800201#endif
Richard Purdiec72a1d62006-03-31 02:31:04 -0800202
Rafael J. Wysockib844eba2008-03-23 20:28:24 +0100203 device_unregister(led_cdev->dev);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800204
Richard Purdie72f8da32007-12-31 23:09:44 +0000205 down_write(&leds_list_lock);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800206 list_del(&led_cdev->node);
Richard Purdie72f8da32007-12-31 23:09:44 +0000207 up_write(&leds_list_lock);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800208}
Rafael J. Wysockib844eba2008-03-23 20:28:24 +0100209EXPORT_SYMBOL_GPL(led_classdev_unregister);
Richard Purdiec72a1d62006-03-31 02:31:04 -0800210
211static int __init leds_init(void)
212{
213 leds_class = class_create(THIS_MODULE, "leds");
214 if (IS_ERR(leds_class))
215 return PTR_ERR(leds_class);
Richard Purdie859cb7f2009-01-08 17:55:03 +0000216 leds_class->suspend = led_suspend;
217 leds_class->resume = led_resume;
Richard Purdiec72a1d62006-03-31 02:31:04 -0800218 return 0;
219}
220
221static void __exit leds_exit(void)
222{
223 class_destroy(leds_class);
224}
225
226subsys_initcall(leds_init);
227module_exit(leds_exit);
228
229MODULE_AUTHOR("John Lenz, Richard Purdie");
230MODULE_LICENSE("GPL");
231MODULE_DESCRIPTION("LED Class Interface");