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> |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 18 | #include <linux/timer.h> |
| 19 | #include <linux/err.h> |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 20 | #include <linux/ctype.h> |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 21 | #include <linux/leds.h> |
| 22 | #include "leds.h" |
| 23 | |
Mohan Pallaka | 5ba505a | 2011-09-29 18:17:35 +0530 | [diff] [blame] | 24 | #define LED_BUFF_SIZE 50 |
| 25 | |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 26 | static struct class *leds_class; |
| 27 | |
Henrique de Moraes Holschuh | 29d76df | 2008-03-18 09:47:48 +0000 | [diff] [blame] | 28 | static void led_update_brightness(struct led_classdev *led_cdev) |
| 29 | { |
| 30 | if (led_cdev->brightness_get) |
| 31 | led_cdev->brightness = led_cdev->brightness_get(led_cdev); |
| 32 | } |
| 33 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 34 | static ssize_t led_brightness_show(struct device *dev, |
| 35 | struct device_attribute *attr, char *buf) |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 36 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 37 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 38 | |
| 39 | /* no lock needed for this */ |
Henrique de Moraes Holschuh | 29d76df | 2008-03-18 09:47:48 +0000 | [diff] [blame] | 40 | led_update_brightness(led_cdev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 41 | |
Mohan Pallaka | 5ba505a | 2011-09-29 18:17:35 +0530 | [diff] [blame] | 42 | return snprintf(buf, LED_BUFF_SIZE, "%u\n", led_cdev->brightness); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 43 | } |
| 44 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 45 | static ssize_t led_brightness_store(struct device *dev, |
| 46 | struct device_attribute *attr, const char *buf, size_t size) |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 47 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 48 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 49 | ssize_t ret = -EINVAL; |
| 50 | char *after; |
| 51 | unsigned long state = simple_strtoul(buf, &after, 10); |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 52 | size_t count = after - buf; |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 53 | |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 54 | if (isspace(*after)) |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 55 | count++; |
| 56 | |
| 57 | if (count == size) { |
| 58 | ret = count; |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 59 | |
| 60 | if (state == LED_OFF) |
| 61 | led_trigger_remove(led_cdev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 62 | led_set_brightness(led_cdev, state); |
| 63 | } |
| 64 | |
| 65 | return ret; |
| 66 | } |
| 67 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 68 | static ssize_t led_max_brightness_store(struct device *dev, |
| 69 | struct device_attribute *attr, const char *buf, size_t size) |
| 70 | { |
| 71 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 72 | ssize_t ret = -EINVAL; |
| 73 | unsigned long state = 0; |
| 74 | |
| 75 | ret = strict_strtoul(buf, 10, &state); |
| 76 | if (!ret) { |
| 77 | ret = size; |
| 78 | if (state > LED_FULL) |
| 79 | state = LED_FULL; |
| 80 | led_cdev->max_brightness = state; |
| 81 | led_set_brightness(led_cdev, led_cdev->brightness); |
| 82 | } |
| 83 | |
| 84 | return ret; |
| 85 | } |
| 86 | |
Guennadi Liakhovetski | 1bd465e | 2009-01-10 18:54:39 +0000 | [diff] [blame] | 87 | static ssize_t led_max_brightness_show(struct device *dev, |
| 88 | struct device_attribute *attr, char *buf) |
| 89 | { |
| 90 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 91 | |
Mohan Pallaka | 5ba505a | 2011-09-29 18:17:35 +0530 | [diff] [blame] | 92 | return snprintf(buf, LED_BUFF_SIZE, "%u\n", led_cdev->max_brightness); |
Guennadi Liakhovetski | 1bd465e | 2009-01-10 18:54:39 +0000 | [diff] [blame] | 93 | } |
| 94 | |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 95 | static struct device_attribute led_class_attrs[] = { |
| 96 | __ATTR(brightness, 0644, led_brightness_show, led_brightness_store), |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 97 | __ATTR(max_brightness, 0644, led_max_brightness_show, |
| 98 | led_max_brightness_store), |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 99 | #ifdef CONFIG_LEDS_TRIGGERS |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 100 | __ATTR(trigger, 0644, led_trigger_show, led_trigger_store), |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 101 | #endif |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 102 | __ATTR_NULL, |
| 103 | }; |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 104 | |
Johannes Berg | 5ada28b | 2010-11-11 14:05:21 -0800 | [diff] [blame] | 105 | static void led_timer_function(unsigned long data) |
| 106 | { |
| 107 | struct led_classdev *led_cdev = (void *)data; |
| 108 | unsigned long brightness; |
| 109 | unsigned long delay; |
| 110 | |
| 111 | if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { |
| 112 | led_set_brightness(led_cdev, LED_OFF); |
| 113 | return; |
| 114 | } |
| 115 | |
| 116 | brightness = led_get_brightness(led_cdev); |
| 117 | if (!brightness) { |
| 118 | /* Time to switch the LED on. */ |
| 119 | brightness = led_cdev->blink_brightness; |
| 120 | delay = led_cdev->blink_delay_on; |
| 121 | } else { |
| 122 | /* Store the current brightness value to be able |
| 123 | * to restore it when the delay_off period is over. |
| 124 | */ |
| 125 | led_cdev->blink_brightness = brightness; |
| 126 | brightness = LED_OFF; |
| 127 | delay = led_cdev->blink_delay_off; |
| 128 | } |
| 129 | |
| 130 | led_set_brightness(led_cdev, brightness); |
| 131 | |
| 132 | mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); |
| 133 | } |
| 134 | |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 135 | /** |
| 136 | * led_classdev_suspend - suspend an led_classdev. |
| 137 | * @led_cdev: the led_classdev to suspend. |
| 138 | */ |
| 139 | void led_classdev_suspend(struct led_classdev *led_cdev) |
| 140 | { |
| 141 | led_cdev->flags |= LED_SUSPENDED; |
| 142 | led_cdev->brightness_set(led_cdev, 0); |
| 143 | } |
| 144 | EXPORT_SYMBOL_GPL(led_classdev_suspend); |
| 145 | |
| 146 | /** |
| 147 | * led_classdev_resume - resume an led_classdev. |
| 148 | * @led_cdev: the led_classdev to resume. |
| 149 | */ |
| 150 | void led_classdev_resume(struct led_classdev *led_cdev) |
| 151 | { |
| 152 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); |
| 153 | led_cdev->flags &= ~LED_SUSPENDED; |
| 154 | } |
| 155 | EXPORT_SYMBOL_GPL(led_classdev_resume); |
| 156 | |
Richard Purdie | 859cb7f | 2009-01-08 17:55:03 +0000 | [diff] [blame] | 157 | static int led_suspend(struct device *dev, pm_message_t state) |
| 158 | { |
| 159 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 160 | |
| 161 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
| 162 | led_classdev_suspend(led_cdev); |
| 163 | |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | static int led_resume(struct device *dev) |
| 168 | { |
| 169 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 170 | |
| 171 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
| 172 | led_classdev_resume(led_cdev); |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 177 | /** |
| 178 | * led_classdev_register - register a new object of led_classdev class. |
Sven Wegener | ff8649a | 2008-12-03 08:04:57 +0000 | [diff] [blame] | 179 | * @parent: The device to register. |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 180 | * @led_cdev: the led_classdev structure for this device. |
| 181 | */ |
| 182 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) |
| 183 | { |
Greg Kroah-Hartman | a9b1261 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 184 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
| 185 | "%s", led_cdev->name); |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 186 | if (IS_ERR(led_cdev->dev)) |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 187 | return PTR_ERR(led_cdev->dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 188 | |
Richard Purdie | 270c395 | 2008-10-20 23:16:17 +0100 | [diff] [blame] | 189 | #ifdef CONFIG_LEDS_TRIGGERS |
| 190 | init_rwsem(&led_cdev->trigger_lock); |
| 191 | #endif |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 192 | /* add to the list of leds */ |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 193 | down_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 194 | list_add_tail(&led_cdev->node, &leds_list); |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 195 | up_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 196 | |
Guennadi Liakhovetski | 1bd465e | 2009-01-10 18:54:39 +0000 | [diff] [blame] | 197 | if (!led_cdev->max_brightness) |
| 198 | led_cdev->max_brightness = LED_FULL; |
| 199 | |
Henrique de Moraes Holschuh | 29d76df | 2008-03-18 09:47:48 +0000 | [diff] [blame] | 200 | led_update_brightness(led_cdev); |
| 201 | |
Johannes Berg | 5ada28b | 2010-11-11 14:05:21 -0800 | [diff] [blame] | 202 | init_timer(&led_cdev->blink_timer); |
| 203 | led_cdev->blink_timer.function = led_timer_function; |
| 204 | led_cdev->blink_timer.data = (unsigned long)led_cdev; |
| 205 | |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 206 | #ifdef CONFIG_LEDS_TRIGGERS |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 207 | led_trigger_set_default(led_cdev); |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 208 | #endif |
| 209 | |
H Hartley Sweeten | bb9b6ef | 2010-01-06 15:34:55 -0700 | [diff] [blame] | 210 | printk(KERN_DEBUG "Registered led device: %s\n", |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 211 | led_cdev->name); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | EXPORT_SYMBOL_GPL(led_classdev_register); |
| 216 | |
| 217 | /** |
Qinghuang Feng | 0266a45 | 2008-10-20 23:04:36 +0100 | [diff] [blame] | 218 | * led_classdev_unregister - unregisters a object of led_properties class. |
Henrik Kretzschmar | 70d63cc | 2006-10-03 23:31:30 +0200 | [diff] [blame] | 219 | * @led_cdev: the led device to unregister |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 220 | * |
| 221 | * Unregisters a previously registered via led_classdev_register object. |
| 222 | */ |
Rafael J. Wysocki | b844eba | 2008-03-23 20:28:24 +0100 | [diff] [blame] | 223 | void led_classdev_unregister(struct led_classdev *led_cdev) |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 224 | { |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 225 | #ifdef CONFIG_LEDS_TRIGGERS |
Richard Purdie | dc47206 | 2007-11-10 13:29:04 +0000 | [diff] [blame] | 226 | down_write(&led_cdev->trigger_lock); |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 227 | if (led_cdev->trigger) |
| 228 | led_trigger_set(led_cdev, NULL); |
Richard Purdie | dc47206 | 2007-11-10 13:29:04 +0000 | [diff] [blame] | 229 | up_write(&led_cdev->trigger_lock); |
Richard Purdie | c3bc995 | 2006-03-31 02:31:05 -0800 | [diff] [blame] | 230 | #endif |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 231 | |
Johannes Berg | 5ada28b | 2010-11-11 14:05:21 -0800 | [diff] [blame] | 232 | /* Stop blinking */ |
| 233 | led_brightness_set(led_cdev, LED_OFF); |
| 234 | |
Rafael J. Wysocki | b844eba | 2008-03-23 20:28:24 +0100 | [diff] [blame] | 235 | device_unregister(led_cdev->dev); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 236 | |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 237 | down_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 238 | list_del(&led_cdev->node); |
Richard Purdie | 72f8da3 | 2007-12-31 23:09:44 +0000 | [diff] [blame] | 239 | up_write(&leds_list_lock); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 240 | } |
Rafael J. Wysocki | b844eba | 2008-03-23 20:28:24 +0100 | [diff] [blame] | 241 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 242 | |
| 243 | static int __init leds_init(void) |
| 244 | { |
| 245 | leds_class = class_create(THIS_MODULE, "leds"); |
| 246 | if (IS_ERR(leds_class)) |
| 247 | return PTR_ERR(leds_class); |
Richard Purdie | 859cb7f | 2009-01-08 17:55:03 +0000 | [diff] [blame] | 248 | leds_class->suspend = led_suspend; |
| 249 | leds_class->resume = led_resume; |
Florian Fainelli | 14b5d6d | 2010-03-10 18:32:18 +0100 | [diff] [blame] | 250 | leds_class->dev_attrs = led_class_attrs; |
Richard Purdie | c72a1d6 | 2006-03-31 02:31:04 -0800 | [diff] [blame] | 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static void __exit leds_exit(void) |
| 255 | { |
| 256 | class_destroy(leds_class); |
| 257 | } |
| 258 | |
| 259 | subsys_initcall(leds_init); |
| 260 | module_exit(leds_exit); |
| 261 | |
| 262 | MODULE_AUTHOR("John Lenz, Richard Purdie"); |
| 263 | MODULE_LICENSE("GPL"); |
| 264 | MODULE_DESCRIPTION("LED Class Interface"); |