LXR linux/drivers/leds/trigger/ledtrig-timer.c

   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
  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/leds.h>
  20
  21static ssize_t led_delay_on_show(struct device *dev,
  22                struct device_attribute *attr, char *buf)
  23{
  24        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  25
  26        return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
  27}
  28
  29static ssize_t led_delay_on_store(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        unsigned long state;
  34        ssize_t ret = -EINVAL;
  35
  36        ret = kstrtoul(buf, 10, &state);
  37        if (ret)
  38                return ret;
  39
  40        led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
  41        led_cdev->blink_delay_on = state;
  42
  43        return size;
  44}
  45
  46static ssize_t led_delay_off_show(struct device *dev,
  47                struct device_attribute *attr, char *buf)
  48{
  49        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  50
  51        return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
  52}
  53
  54static ssize_t led_delay_off_store(struct device *dev,
  55                struct device_attribute *attr, const char *buf, size_t size)
  56{
  57        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  58        unsigned long state;
  59        ssize_t ret = -EINVAL;
  60
  61        ret = kstrtoul(buf, 10, &state);
  62        if (ret)
  63                return ret;
  64
  65        led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
  66        led_cdev->blink_delay_off = state;
  67
  68        return size;
  69}
  70
  71static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
  72static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
  73
  74static void timer_trig_activate(struct led_classdev *led_cdev)
  75{
  76        int rc;
  77
  78        led_cdev->trigger_data = NULL;
  79
  80        rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
  81        if (rc)
  82                return;
  83        rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
  84        if (rc)
  85                goto err_out_delayon;
  86
  87        led_blink_set(led_cdev, &led_cdev->blink_delay_on,
  88                      &led_cdev->blink_delay_off);
  89        led_cdev->activated = true;
  90
  91        return;
  92
  93err_out_delayon:
  94        device_remove_file(led_cdev->dev, &dev_attr_delay_on);
  95}
  96
  97static void timer_trig_deactivate(struct led_classdev *led_cdev)
  98{
  99        if (led_cdev->activated) {
 100                device_remove_file(led_cdev->dev, &dev_attr_delay_on);
 101                device_remove_file(led_cdev->dev, &dev_attr_delay_off);
 102                led_cdev->activated = false;
 103        }
 104
 105        /* Stop blinking */
 106        led_set_brightness(led_cdev, LED_OFF);
 107}
 108
 109static struct led_trigger timer_led_trigger = {
 110        .name     = "timer",
 111        .activate = timer_trig_activate,
 112        .deactivate = timer_trig_deactivate,
 113};
 114
 115static int __init timer_trig_init(void)
 116{
 117        return led_trigger_register(&timer_led_trigger);
 118}
 119
 120static void __exit timer_trig_exit(void)
 121{
 122        led_trigger_unregister(&timer_led_trigger);
 123}
 124
 125module_init(timer_trig_init);
 126module_exit(timer_trig_exit);
 127
 128MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
 129MODULE_DESCRIPTION("Timer LED trigger");
 130MODULE_LICENSE("GPL");
 131