Fabio Baltieri | 5e41728 | 2012-06-07 06:11:05 +0800 | [diff] [blame] | 1 | /* |
| 2 | * One-shot LED Trigger |
| 3 | * |
| 4 | * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com> |
| 5 | * |
| 6 | * Based on ledtrig-timer.c by 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 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/ctype.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/leds.h> |
| 21 | #include "leds.h" |
| 22 | |
| 23 | #define DEFAULT_DELAY 100 |
| 24 | |
| 25 | struct oneshot_trig_data { |
| 26 | unsigned int invert; |
| 27 | }; |
| 28 | |
| 29 | static ssize_t led_shot(struct device *dev, |
| 30 | struct device_attribute *attr, const char *buf, size_t size) |
| 31 | { |
| 32 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 33 | struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data; |
| 34 | |
| 35 | led_blink_set_oneshot(led_cdev, |
| 36 | &led_cdev->blink_delay_on, &led_cdev->blink_delay_off, |
| 37 | oneshot_data->invert); |
| 38 | |
| 39 | /* content is ignored */ |
| 40 | return size; |
| 41 | } |
| 42 | static ssize_t led_invert_show(struct device *dev, |
| 43 | struct device_attribute *attr, char *buf) |
| 44 | { |
| 45 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 46 | struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data; |
| 47 | |
| 48 | return sprintf(buf, "%u\n", oneshot_data->invert); |
| 49 | } |
| 50 | |
| 51 | static ssize_t led_invert_store(struct device *dev, |
| 52 | struct device_attribute *attr, const char *buf, size_t size) |
| 53 | { |
| 54 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 55 | struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data; |
| 56 | unsigned long state; |
| 57 | int ret; |
| 58 | |
| 59 | ret = kstrtoul(buf, 0, &state); |
| 60 | if (ret) |
| 61 | return ret; |
| 62 | |
| 63 | oneshot_data->invert = !!state; |
| 64 | |
| 65 | if (oneshot_data->invert) |
Shuah Khan | 0da3e65 | 2012-06-13 10:01:37 +0800 | [diff] [blame] | 66 | __led_set_brightness(led_cdev, LED_FULL); |
Fabio Baltieri | 5e41728 | 2012-06-07 06:11:05 +0800 | [diff] [blame] | 67 | else |
Shuah Khan | 0da3e65 | 2012-06-13 10:01:37 +0800 | [diff] [blame] | 68 | __led_set_brightness(led_cdev, LED_OFF); |
Fabio Baltieri | 5e41728 | 2012-06-07 06:11:05 +0800 | [diff] [blame] | 69 | |
| 70 | return size; |
| 71 | } |
| 72 | |
| 73 | static ssize_t led_delay_on_show(struct device *dev, |
| 74 | struct device_attribute *attr, char *buf) |
| 75 | { |
| 76 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 77 | |
| 78 | return sprintf(buf, "%lu\n", led_cdev->blink_delay_on); |
| 79 | } |
| 80 | |
| 81 | static ssize_t led_delay_on_store(struct device *dev, |
| 82 | struct device_attribute *attr, const char *buf, size_t size) |
| 83 | { |
| 84 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 85 | unsigned long state; |
| 86 | int ret; |
| 87 | |
| 88 | ret = kstrtoul(buf, 0, &state); |
| 89 | if (ret) |
| 90 | return ret; |
| 91 | |
| 92 | led_cdev->blink_delay_on = state; |
| 93 | |
| 94 | return size; |
| 95 | } |
| 96 | static ssize_t led_delay_off_show(struct device *dev, |
| 97 | struct device_attribute *attr, char *buf) |
| 98 | { |
| 99 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 100 | |
| 101 | return sprintf(buf, "%lu\n", led_cdev->blink_delay_off); |
| 102 | } |
| 103 | |
| 104 | static ssize_t led_delay_off_store(struct device *dev, |
| 105 | struct device_attribute *attr, const char *buf, size_t size) |
| 106 | { |
| 107 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 108 | unsigned long state; |
| 109 | int ret; |
| 110 | |
| 111 | ret = kstrtoul(buf, 0, &state); |
| 112 | if (ret) |
| 113 | return ret; |
| 114 | |
| 115 | led_cdev->blink_delay_off = state; |
| 116 | |
| 117 | return size; |
| 118 | } |
| 119 | |
| 120 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
| 121 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); |
| 122 | static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store); |
| 123 | static DEVICE_ATTR(shot, 0200, NULL, led_shot); |
| 124 | |
| 125 | static void oneshot_trig_activate(struct led_classdev *led_cdev) |
| 126 | { |
| 127 | struct oneshot_trig_data *oneshot_data; |
| 128 | int rc; |
| 129 | |
| 130 | oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL); |
| 131 | if (!oneshot_data) |
| 132 | return; |
| 133 | |
| 134 | led_cdev->trigger_data = oneshot_data; |
| 135 | |
| 136 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
| 137 | if (rc) |
| 138 | goto err_out_trig_data; |
| 139 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); |
| 140 | if (rc) |
| 141 | goto err_out_delayon; |
| 142 | rc = device_create_file(led_cdev->dev, &dev_attr_invert); |
| 143 | if (rc) |
| 144 | goto err_out_delayoff; |
| 145 | rc = device_create_file(led_cdev->dev, &dev_attr_shot); |
| 146 | if (rc) |
| 147 | goto err_out_invert; |
| 148 | |
| 149 | led_cdev->blink_delay_on = DEFAULT_DELAY; |
| 150 | led_cdev->blink_delay_off = DEFAULT_DELAY; |
| 151 | |
| 152 | led_cdev->activated = true; |
| 153 | |
| 154 | return; |
| 155 | |
| 156 | err_out_invert: |
| 157 | device_remove_file(led_cdev->dev, &dev_attr_invert); |
| 158 | err_out_delayoff: |
| 159 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); |
| 160 | err_out_delayon: |
| 161 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| 162 | err_out_trig_data: |
| 163 | kfree(led_cdev->trigger_data); |
| 164 | } |
| 165 | |
| 166 | static void oneshot_trig_deactivate(struct led_classdev *led_cdev) |
| 167 | { |
| 168 | struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data; |
| 169 | |
| 170 | if (led_cdev->activated) { |
| 171 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| 172 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); |
| 173 | device_remove_file(led_cdev->dev, &dev_attr_invert); |
| 174 | device_remove_file(led_cdev->dev, &dev_attr_shot); |
| 175 | kfree(oneshot_data); |
| 176 | led_cdev->activated = false; |
| 177 | } |
| 178 | |
| 179 | /* Stop blinking */ |
Shuah Khan | 19cd67e | 2012-06-14 04:34:30 +0800 | [diff] [blame] | 180 | led_set_brightness(led_cdev, LED_OFF); |
Fabio Baltieri | 5e41728 | 2012-06-07 06:11:05 +0800 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | static struct led_trigger oneshot_led_trigger = { |
| 184 | .name = "oneshot", |
| 185 | .activate = oneshot_trig_activate, |
| 186 | .deactivate = oneshot_trig_deactivate, |
| 187 | }; |
| 188 | |
| 189 | static int __init oneshot_trig_init(void) |
| 190 | { |
| 191 | return led_trigger_register(&oneshot_led_trigger); |
| 192 | } |
| 193 | |
| 194 | static void __exit oneshot_trig_exit(void) |
| 195 | { |
| 196 | led_trigger_unregister(&oneshot_led_trigger); |
| 197 | } |
| 198 | |
| 199 | module_init(oneshot_trig_init); |
| 200 | module_exit(oneshot_trig_exit); |
| 201 | |
| 202 | MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>"); |
| 203 | MODULE_DESCRIPTION("One-shot LED trigger"); |
| 204 | MODULE_LICENSE("GPL"); |