linux/drivers/leds/ledtrig-timer.c
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   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#include "leds.h"
  21
  22static ssize_t led_delay_on_show(struct device *dev,
  23                struct device_attribute *attr, char *buf)
  24{
  25        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  26
  27        return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
  28}
  29
  30static ssize_t led_delay_on_store(struct device *dev,
  31                struct device_attribute *attr, const char *buf, size_t size)
  32{
  33        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  34        unsigned long state;
  35        ssize_t ret = -EINVAL;
  36
  37        ret = kstrtoul(buf, 10, &state);
  38        if (ret)
  39                return ret;
  40
  41        led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
  42        led_cdev->blink_delay_on = state;
  43
  44        return size;
  45}
  46
  47static ssize_t led_delay_off_show(struct device *dev,
  48                struct device_attribute *attr, char *buf)
  49{
  50        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  51
  52        return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
  53}
  54
  55static ssize_t led_delay_off_store(struct device *dev,
  56                struct device_attribute *attr, const char *buf, size_t size)
  57{
  58        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  59        unsigned long state;
  60        ssize_t ret = -EINVAL;
  61
  62        ret = kstrtoul(buf, 10, &state);
  63        if (ret)
  64                return ret;
  65
  66        led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
  67        led_cdev->blink_delay_off = state;
  68
  69        return size;
  70}
  71
  72static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
  73static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
  74
  75static void timer_trig_activate(struct led_classdev *led_cdev)
  76{
  77        int rc;
  78
  79        led_cdev->trigger_data = NULL;
  80
  81        rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
  82        if (rc)
  83                return;
  84        rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
  85        if (rc)
  86                goto err_out_delayon;
  87
  88        led_blink_set(led_cdev, &led_cdev->blink_delay_on,
  89                      &led_cdev->blink_delay_off);
  90        led_cdev->activated = true;
  91
  92        return;
  93
  94err_out_delayon:
  95        device_remove_file(led_cdev->dev, &dev_attr_delay_on);
  96}
  97
  98static void timer_trig_deactivate(struct led_classdev *led_cdev)
  99{
 100        if (led_cdev->activated) {
 101                device_remove_file(led_cdev->dev, &dev_attr_delay_on);
 102                device_remove_file(led_cdev->dev, &dev_attr_delay_off);
 103                led_cdev->activated = false;
 104        }
 105
 106        /* Stop blinking */
 107        led_set_brightness(led_cdev, LED_OFF);
 108}
 109
 110static struct led_trigger timer_led_trigger = {
 111        .name     = "timer",
 112        .activate = timer_trig_activate,
 113        .deactivate = timer_trig_deactivate,
 114};
 115
 116static int __init timer_trig_init(void)
 117{
 118        return led_trigger_register(&timer_led_trigger);
 119}
 120
 121static void __exit timer_trig_exit(void)
 122{
 123        led_trigger_unregister(&timer_led_trigger);
 124}
 125
 126module_init(timer_trig_init);
 127module_exit(timer_trig_exit);
 128
 129MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
 130MODULE_DESCRIPTION("Timer LED trigger");
 131MODULE_LICENSE("GPL");
 132
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