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 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 67 | static ssize_t led_delay_on_show(struct device *dev, |
| 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 | |
| 73 | sprintf(buf, "%lu\n", timer_data->delay_on); |
| 74 | |
| 75 | return strlen(buf) + 1; |
| 76 | } |
| 77 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 78 | static ssize_t led_delay_on_store(struct device *dev, |
| 79 | struct device_attribute *attr, const char *buf, size_t size) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 80 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 81 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 82 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 83 | int ret = -EINVAL; |
| 84 | char *after; |
| 85 | unsigned long state = simple_strtoul(buf, &after, 10); |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 86 | size_t count = after - buf; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 87 | |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 88 | if (*after && isspace(*after)) |
| 89 | count++; |
| 90 | |
| 91 | if (count == size) { |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 92 | if (timer_data->delay_on != state) { |
| 93 | /* the new value differs from the previous */ |
| 94 | timer_data->delay_on = state; |
| 95 | |
| 96 | /* deactivate previous settings */ |
| 97 | del_timer_sync(&timer_data->timer); |
| 98 | |
| 99 | /* try to activate hardware acceleration, if any */ |
| 100 | if (!led_cdev->blink_set || |
| 101 | led_cdev->blink_set(led_cdev, |
| 102 | &timer_data->delay_on, &timer_data->delay_off)) { |
| 103 | /* no hardware acceleration, blink via timer */ |
| 104 | mod_timer(&timer_data->timer, jiffies + 1); |
| 105 | } |
| 106 | } |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 107 | ret = count; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | return ret; |
| 111 | } |
| 112 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 113 | static ssize_t led_delay_off_show(struct device *dev, |
| 114 | struct device_attribute *attr, char *buf) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 115 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 116 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 117 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 118 | |
| 119 | sprintf(buf, "%lu\n", timer_data->delay_off); |
| 120 | |
| 121 | return strlen(buf) + 1; |
| 122 | } |
| 123 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 124 | static ssize_t led_delay_off_store(struct device *dev, |
| 125 | struct device_attribute *attr, const char *buf, size_t size) |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 126 | { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 127 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 128 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 129 | int ret = -EINVAL; |
| 130 | char *after; |
| 131 | unsigned long state = simple_strtoul(buf, &after, 10); |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 132 | size_t count = after - buf; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 133 | |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 134 | if (*after && isspace(*after)) |
| 135 | count++; |
| 136 | |
| 137 | if (count == size) { |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 138 | if (timer_data->delay_off != state) { |
| 139 | /* the new value differs from the previous */ |
| 140 | timer_data->delay_off = state; |
| 141 | |
| 142 | /* deactivate previous settings */ |
| 143 | del_timer_sync(&timer_data->timer); |
| 144 | |
| 145 | /* try to activate hardware acceleration, if any */ |
| 146 | if (!led_cdev->blink_set || |
| 147 | led_cdev->blink_set(led_cdev, |
| 148 | &timer_data->delay_on, &timer_data->delay_off)) { |
| 149 | /* no hardware acceleration, blink via timer */ |
| 150 | mod_timer(&timer_data->timer, jiffies + 1); |
| 151 | } |
| 152 | } |
Richard Purdie | 3dc7b82 | 2006-05-15 09:44:17 -0700 | [diff] [blame] | 153 | ret = count; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | return ret; |
| 157 | } |
| 158 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 159 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
| 160 | 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] | 161 | |
| 162 | static void timer_trig_activate(struct led_classdev *led_cdev) |
| 163 | { |
| 164 | struct timer_trig_data *timer_data; |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 165 | int rc; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 166 | |
| 167 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); |
| 168 | if (!timer_data) |
| 169 | return; |
| 170 | |
Németh Márton | 0013b23 | 2008-03-09 20:54:37 +0000 | [diff] [blame^] | 171 | timer_data->brightness_on = led_get_brightness(led_cdev); |
| 172 | if (timer_data->brightness_on == LED_OFF) |
| 173 | timer_data->brightness_on = LED_FULL; |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 174 | led_cdev->trigger_data = timer_data; |
| 175 | |
| 176 | init_timer(&timer_data->timer); |
| 177 | timer_data->timer.function = led_timer_function; |
| 178 | timer_data->timer.data = (unsigned long) led_cdev; |
| 179 | |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 180 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
| 181 | if (rc) |
| 182 | goto err_out; |
| 183 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); |
| 184 | if (rc) |
| 185 | goto err_out_delayon; |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 186 | |
Márton Németh | 4c79141 | 2007-10-31 15:07:12 +0100 | [diff] [blame] | 187 | /* If there is hardware support for blinking, start one |
| 188 | * user friendly blink rate chosen by the driver. |
| 189 | */ |
| 190 | if (led_cdev->blink_set) |
| 191 | led_cdev->blink_set(led_cdev, |
| 192 | &timer_data->delay_on, &timer_data->delay_off); |
| 193 | |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 194 | return; |
| 195 | |
| 196 | err_out_delayon: |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 197 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
Jeff Garzik | 12fda16 | 2006-10-17 00:10:20 -0700 | [diff] [blame] | 198 | err_out: |
| 199 | led_cdev->trigger_data = NULL; |
| 200 | kfree(timer_data); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 201 | } |
| 202 | |
| 203 | static void timer_trig_deactivate(struct led_classdev *led_cdev) |
| 204 | { |
| 205 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
| 206 | |
| 207 | if (timer_data) { |
Richard Purdie | f8a7c6f | 2007-07-08 23:19:31 +0100 | [diff] [blame] | 208 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| 209 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); |
Richard Purdie | 6655c6f | 2006-03-31 02:31:07 -0800 | [diff] [blame] | 210 | del_timer_sync(&timer_data->timer); |
| 211 | kfree(timer_data); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static struct led_trigger timer_led_trigger = { |
| 216 | .name = "timer", |
| 217 | .activate = timer_trig_activate, |
| 218 | .deactivate = timer_trig_deactivate, |
| 219 | }; |
| 220 | |
| 221 | static int __init timer_trig_init(void) |
| 222 | { |
| 223 | return led_trigger_register(&timer_led_trigger); |
| 224 | } |
| 225 | |
| 226 | static void __exit timer_trig_exit(void) |
| 227 | { |
| 228 | led_trigger_unregister(&timer_led_trigger); |
| 229 | } |
| 230 | |
| 231 | module_init(timer_trig_init); |
| 232 | module_exit(timer_trig_exit); |
| 233 | |
| 234 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); |
| 235 | MODULE_DESCRIPTION("Timer LED trigger"); |
| 236 | MODULE_LICENSE("GPL"); |