Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * LED Kernel Timer Trigger |
| 3 | * |
| 4 | * Copyright 2005-2006 Openedhand Ltd. |
| 5 | * |
| 6 | * Author: Richard Purdie <rpurdie@openedhand.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | */ |
| 13 | |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 14 | #include <linux/module.h> |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 15 | #include <linux/jiffies.h> |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/spinlock.h> |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/sysdev.h> |
| 22 | #include <linux/timer.h> |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 23 | #include <linux/ctype.h> |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 24 | #include <linux/leds.h> |
| 25 | #include "leds.h" |
| 26 | |
| 27 | struct timer_trig_data { |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 28 | int brightness_on; /* LED brightness during "on" period. |
| 29 | * (LED_OFF < brightness_on <= LED_FULL) |
| 30 | */ |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 31 | unsigned long delay_on; /* milliseconds on */ |
| 32 | unsigned long delay_off; /* milliseconds off */ |
| 33 | struct timer_list timer; |
| 34 | }; |
| 35 | |
| 36 | static void led_timer_function(unsigned long data) |
| 37 | { |
| 38 | struct led_classdev *led_cdev = (struct led_classdev *) data; |
| 39 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 40 | unsigned long brightness; |
| 41 | unsigned long delay; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 42 | |
| 43 | if (!timer_data->delay_on || !timer_data->delay_off) { |
| 44 | led_set_brightness(led_cdev, LED_OFF); |
| 45 | return; |
| 46 | } |
| 47 | |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 48 | brightness = led_get_brightness(led_cdev); |
| 49 | if (!brightness) { |
| 50 | /* Time to switch the LED on. */ |
| 51 | brightness = timer_data->brightness_on; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 52 | delay = timer_data->delay_on; |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 53 | } else { |
| 54 | /* Store the current brightness value to be able |
| 55 | * to restore it when the delay_off period is over. |
| 56 | */ |
| 57 | timer_data->brightness_on = brightness; |
| 58 | brightness = LED_OFF; |
| 59 | delay = timer_data->delay_off; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | led_set_brightness(led_cdev, brightness); |
| 63 | |
| 64 | mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay)); |
| 65 | } |
| 66 | |
Németh Márton | 4d404fd | 2008-03-09 20:59:57 +0000 | [diff] [blame] | 67 | static ssize_t led_delay_on_show(struct device *dev, |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 68 | struct device_attribute *attr, char *buf) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 69 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 70 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 71 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 72 | |
Sven Wegener | dd8e5a2 | 2008-10-13 10:41:39 +0100 | [diff] [blame] | 73 | return sprintf(buf, "%lu\n", timer_data->delay_on); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 74 | } |
| 75 | |
Németh Márton | 4d404fd | 2008-03-09 20:59:57 +0000 | [diff] [blame] | 76 | static ssize_t led_delay_on_store(struct device *dev, |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 77 | struct device_attribute *attr, const char *buf, size_t size) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 78 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 79 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 80 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 81 | int ret = -EINVAL; |
| 82 | char *after; |
| 83 | unsigned long state = simple_strtoul(buf, &after, 10); |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 84 | size_t count = after - buf; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 85 | |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 86 | if (*after && isspace(*after)) |
| 87 | count++; |
| 88 | |
| 89 | if (count == size) { |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 90 | if (timer_data->delay_on != state) { |
| 91 | /* the new value differs from the previous */ |
| 92 | timer_data->delay_on = state; |
| 93 | |
| 94 | /* deactivate previous settings */ |
| 95 | del_timer_sync(&timer_data->timer); |
| 96 | |
| 97 | /* try to activate hardware acceleration, if any */ |
| 98 | if (!led_cdev->blink_set || |
| 99 | led_cdev->blink_set(led_cdev, |
Németh Márton | 4d404fd | 2008-03-09 20:59:57 +0000 | [diff] [blame] | 100 | &timer_data->delay_on, &timer_data->delay_off)) { |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 101 | /* no hardware acceleration, blink via timer */ |
| 102 | mod_timer(&timer_data->timer, jiffies + 1); |
| 103 | } |
| 104 | } |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 105 | ret = count; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | return ret; |
| 109 | } |
| 110 | |
Németh Márton | 4d404fd | 2008-03-09 20:59:57 +0000 | [diff] [blame] | 111 | static ssize_t led_delay_off_show(struct device *dev, |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 112 | struct device_attribute *attr, char *buf) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 113 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 114 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 115 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 116 | |
Sven Wegener | dd8e5a2 | 2008-10-13 10:41:39 +0100 | [diff] [blame] | 117 | return sprintf(buf, "%lu\n", timer_data->delay_off); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 118 | } |
| 119 | |
Németh Márton | 4d404fd | 2008-03-09 20:59:57 +0000 | [diff] [blame] | 120 | static ssize_t led_delay_off_store(struct device *dev, |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 121 | struct device_attribute *attr, const char *buf, size_t size) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 122 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 123 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 124 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 125 | int ret = -EINVAL; |
| 126 | char *after; |
| 127 | unsigned long state = simple_strtoul(buf, &after, 10); |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 128 | size_t count = after - buf; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 129 | |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 130 | if (*after && isspace(*after)) |
| 131 | count++; |
| 132 | |
| 133 | if (count == size) { |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 134 | if (timer_data->delay_off != state) { |
| 135 | /* the new value differs from the previous */ |
| 136 | timer_data->delay_off = state; |
| 137 | |
| 138 | /* deactivate previous settings */ |
| 139 | del_timer_sync(&timer_data->timer); |
| 140 | |
| 141 | /* try to activate hardware acceleration, if any */ |
| 142 | if (!led_cdev->blink_set || |
| 143 | led_cdev->blink_set(led_cdev, |
Németh Márton | 4d404fd | 2008-03-09 20:59:57 +0000 | [diff] [blame] | 144 | &timer_data->delay_on, &timer_data->delay_off)) { |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 145 | /* no hardware acceleration, blink via timer */ |
| 146 | mod_timer(&timer_data->timer, jiffies + 1); |
| 147 | } |
| 148 | } |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 149 | ret = count; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | return ret; |
| 153 | } |
| 154 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 155 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
| 156 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 157 | |
| 158 | static void timer_trig_activate(struct led_classdev *led_cdev) |
| 159 | { |
| 160 | struct timer_trig_data *timer_data; |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 161 | int rc; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 162 | |
| 163 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); |
| 164 | if (!timer_data) |
| 165 | return; |
| 166 | |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame] | 167 | timer_data->brightness_on = led_get_brightness(led_cdev); |
| 168 | if (timer_data->brightness_on == LED_OFF) |
Guennadi Liakhovetski | 1bd465e | 2009-01-10 18:54:39 +0000 | [diff] [blame^] | 169 | timer_data->brightness_on = led_cdev->max_brightness; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 170 | led_cdev->trigger_data = timer_data; |
| 171 | |
| 172 | init_timer(&timer_data->timer); |
| 173 | timer_data->timer.function = led_timer_function; |
| 174 | timer_data->timer.data = (unsigned long) led_cdev; |
| 175 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 176 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
| 177 | if (rc) |
| 178 | goto err_out; |
| 179 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); |
| 180 | if (rc) |
| 181 | goto err_out_delayon; |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 182 | |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 183 | /* If there is hardware support for blinking, start one |
| 184 | * user friendly blink rate chosen by the driver. |
| 185 | */ |
| 186 | if (led_cdev->blink_set) |
| 187 | led_cdev->blink_set(led_cdev, |
| 188 | &timer_data->delay_on, &timer_data->delay_off); |
| 189 | |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 190 | return; |
| 191 | |
| 192 | err_out_delayon: |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 193 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 194 | err_out: |
| 195 | led_cdev->trigger_data = NULL; |
| 196 | kfree(timer_data); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | static void timer_trig_deactivate(struct led_classdev *led_cdev) |
| 200 | { |
| 201 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
Rodolfo Giometti | ce70a24 | 2009-01-08 19:50:15 +0000 | [diff] [blame] | 202 | unsigned long on = 0, off = 0; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 203 | |
| 204 | if (timer_data) { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 205 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| 206 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 207 | del_timer_sync(&timer_data->timer); |
| 208 | kfree(timer_data); |
| 209 | } |
Rodolfo Giometti | ce70a24 | 2009-01-08 19:50:15 +0000 | [diff] [blame] | 210 | |
| 211 | /* If there is hardware support for blinking, stop it */ |
| 212 | if (led_cdev->blink_set) |
| 213 | led_cdev->blink_set(led_cdev, &on, &off); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static struct led_trigger timer_led_trigger = { |
| 217 | .name = "timer", |
| 218 | .activate = timer_trig_activate, |
| 219 | .deactivate = timer_trig_deactivate, |
| 220 | }; |
| 221 | |
| 222 | static int __init timer_trig_init(void) |
| 223 | { |
| 224 | return led_trigger_register(&timer_led_trigger); |
| 225 | } |
| 226 | |
| 227 | static void __exit timer_trig_exit(void) |
| 228 | { |
| 229 | led_trigger_unregister(&timer_led_trigger); |
| 230 | } |
| 231 | |
| 232 | module_init(timer_trig_init); |
| 233 | module_exit(timer_trig_exit); |
| 234 | |
| 235 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); |
| 236 | MODULE_DESCRIPTION("Timer LED trigger"); |
| 237 | MODULE_LICENSE("GPL"); |