Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 1 | /* |
| 2 | * LED Class Core |
| 3 | * |
| 4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 5 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 6 | * |
| 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 Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 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> |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 21 | #include <linux/ctype.h> |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 22 | #include <linux/leds.h> |
| 23 | #include "leds.h" |
| 24 | |
| 25 | static struct class *leds_class; |
| 26 | |
Henrique de Moraes Holschuh | 29d76df | 2008-03-18 09:47:48 +0000 | [diff] [blame] | 27 | static 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 Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 33 | static ssize_t led_brightness_show(struct device *dev, |
| 34 | struct device_attribute *attr, char *buf) |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 35 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 36 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 37 | |
| 38 | /* no lock needed for this */ |
Henrique de Moraes Holschuh | 29d76df | 2008-03-18 09:47:48 +0000 | [diff] [blame] | 39 | led_update_brightness(led_cdev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 40 | |
Sven Wegener | dd8e5a2 | 2008-10-13 10:41:39 +0100 | [diff] [blame] | 41 | return sprintf(buf, "%u\n", led_cdev->brightness); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 42 | } |
| 43 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 44 | static ssize_t led_brightness_store(struct device *dev, |
| 45 | struct device_attribute *attr, const char *buf, size_t size) |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 46 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 47 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 48 | ssize_t ret = -EINVAL; |
| 49 | char *after; |
| 50 | unsigned long state = simple_strtoul(buf, &after, 10); |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 51 | size_t count = after - buf; |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 52 | |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 53 | if (isspace(*after)) |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 54 | count++; |
| 55 | |
| 56 | if (count == size) { |
| 57 | ret = count; |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 58 | |
| 59 | if (state == LED_OFF) |
| 60 | led_trigger_remove(led_cdev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 61 | led_set_brightness(led_cdev, state); |
| 62 | } |
| 63 | |
| 64 | return ret; |
| 65 | } |
| 66 | |
Guennadi Liakhovetski | 1bd465e | 2009-01-10 18:54:39 +0000 | [diff] [blame] | 67 | static 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 | |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 75 | static struct device_attribute led_class_attrs[] = { |
| 76 | __ATTR(brightness, 0644, led_brightness_show, led_brightness_store), |
Axel Lin | 569762e | 2010-05-17 08:48:28 +0800 | [diff] [blame^] | 77 | __ATTR(max_brightness, 0444, led_max_brightness_show, NULL), |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 78 | #ifdef CONFIG_LEDS_TRIGGERS |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 79 | __ATTR(trigger, 0644, led_trigger_show, led_trigger_store), |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 80 | #endif |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 81 | __ATTR_NULL, |
| 82 | }; |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 83 | |
| 84 | /** |
| 85 | * led_classdev_suspend - suspend an led_classdev. |
| 86 | * @led_cdev: the led_classdev to suspend. |
| 87 | */ |
| 88 | void led_classdev_suspend(struct led_classdev *led_cdev) |
| 89 | { |
| 90 | led_cdev->flags |= LED_SUSPENDED; |
| 91 | led_cdev->brightness_set(led_cdev, 0); |
| 92 | } |
| 93 | EXPORT_SYMBOL_GPL(led_classdev_suspend); |
| 94 | |
| 95 | /** |
| 96 | * led_classdev_resume - resume an led_classdev. |
| 97 | * @led_cdev: the led_classdev to resume. |
| 98 | */ |
| 99 | void led_classdev_resume(struct led_classdev *led_cdev) |
| 100 | { |
| 101 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); |
| 102 | led_cdev->flags &= ~LED_SUSPENDED; |
| 103 | } |
| 104 | EXPORT_SYMBOL_GPL(led_classdev_resume); |
| 105 | |
Richard Purdie | 859cb7f | 2009-01-08 17:55:03 +0000 | [diff] [blame] | 106 | static int led_suspend(struct device *dev, pm_message_t state) |
| 107 | { |
| 108 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 109 | |
| 110 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
| 111 | led_classdev_suspend(led_cdev); |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static int led_resume(struct device *dev) |
| 117 | { |
| 118 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 119 | |
| 120 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
| 121 | led_classdev_resume(led_cdev); |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 126 | /** |
| 127 | * led_classdev_register - register a new object of led_classdev class. |
Sven Wegener | ff8649a | 2008-12-03 08:04:57 +0000 | [diff] [blame] | 128 | * @parent: The device to register. |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 129 | * @led_cdev: the led_classdev structure for this device. |
| 130 | */ |
| 131 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) |
| 132 | { |
Greg Kroah-Hartman | a9b1261 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 133 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
| 134 | "%s", led_cdev->name); |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 135 | if (IS_ERR(led_cdev->dev)) |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 136 | return PTR_ERR(led_cdev->dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 137 | |
Richard Purdie | 270c395 | 2008-10-20 23:16:17 +0100 | [diff] [blame] | 138 | #ifdef CONFIG_LEDS_TRIGGERS |
| 139 | init_rwsem(&led_cdev->trigger_lock); |
| 140 | #endif |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 141 | /* add to the list of leds */ |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 142 | down_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 143 | list_add_tail(&led_cdev->node, &leds_list); |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 144 | up_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 145 | |
Guennadi Liakhovetski | 1bd465e | 2009-01-10 18:54:39 +0000 | [diff] [blame] | 146 | if (!led_cdev->max_brightness) |
| 147 | led_cdev->max_brightness = LED_FULL; |
| 148 | |
Henrique de Moraes Holschuh | 29d76df | 2008-03-18 09:47:48 +0000 | [diff] [blame] | 149 | led_update_brightness(led_cdev); |
| 150 | |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 151 | #ifdef CONFIG_LEDS_TRIGGERS |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 152 | led_trigger_set_default(led_cdev); |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 153 | #endif |
| 154 | |
H Hartley Sweeten | bb9b6ef | 2010-01-06 15:34:55 -0700 | [diff] [blame] | 155 | printk(KERN_DEBUG "Registered led device: %s\n", |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 156 | led_cdev->name); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 157 | |
| 158 | return 0; |
| 159 | } |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 160 | |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 161 | EXPORT_SYMBOL_GPL(led_classdev_register); |
| 162 | |
| 163 | /** |
Qinghuang Feng | 0266a45 | 2008-10-20 23:04:36 +0100 | [diff] [blame] | 164 | * led_classdev_unregister - unregisters a object of led_properties class. |
Henrik Kretzschmar | 70d63cc | 2006-10-03 23:31:30 +0200 | [diff] [blame] | 165 | * @led_cdev: the led device to unregister |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 166 | * |
| 167 | * Unregisters a previously registered via led_classdev_register object. |
| 168 | */ |
Rafael J. Wysocki | b844eba | 2008-03-23 20:28:24 +0100 | [diff] [blame] | 169 | void led_classdev_unregister(struct led_classdev *led_cdev) |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 170 | { |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 171 | #ifdef CONFIG_LEDS_TRIGGERS |
Richard Purdie | dc47206 | 2007-11-10 13:29:04 +0000 | [diff] [blame] | 172 | down_write(&led_cdev->trigger_lock); |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 173 | if (led_cdev->trigger) |
| 174 | led_trigger_set(led_cdev, NULL); |
Richard Purdie | dc47206 | 2007-11-10 13:29:04 +0000 | [diff] [blame] | 175 | up_write(&led_cdev->trigger_lock); |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 176 | #endif |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 177 | |
Rafael J. Wysocki | b844eba | 2008-03-23 20:28:24 +0100 | [diff] [blame] | 178 | device_unregister(led_cdev->dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 179 | |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 180 | down_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 181 | list_del(&led_cdev->node); |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 182 | up_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 183 | } |
Rafael J. Wysocki | b844eba | 2008-03-23 20:28:24 +0100 | [diff] [blame] | 184 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 185 | |
| 186 | static int __init leds_init(void) |
| 187 | { |
| 188 | leds_class = class_create(THIS_MODULE, "leds"); |
| 189 | if (IS_ERR(leds_class)) |
| 190 | return PTR_ERR(leds_class); |
Richard Purdie | 859cb7f | 2009-01-08 17:55:03 +0000 | [diff] [blame] | 191 | leds_class->suspend = led_suspend; |
| 192 | leds_class->resume = led_resume; |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 193 | leds_class->dev_attrs = led_class_attrs; |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static void __exit leds_exit(void) |
| 198 | { |
| 199 | class_destroy(leds_class); |
| 200 | } |
| 201 | |
| 202 | subsys_initcall(leds_init); |
| 203 | module_exit(leds_exit); |
| 204 | |
| 205 | MODULE_AUTHOR("John Lenz, Richard Purdie"); |
| 206 | MODULE_LICENSE("GPL"); |
| 207 | MODULE_DESCRIPTION("LED Class Interface"); |