LXR linux/drivers/leds/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#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        int ret = -EINVAL;
  35        char *after;
  36        unsigned long state = simple_strtoul(buf, &after, 10);
  37        size_t count = after - buf;
  38
  39        if (isspace(*after))
  40                count++;
  41
  42        if (count == size) {
  43                led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
  44                ret = count;
  45        }
  46
  47        return ret;
  48}
  49
  50static ssize_t led_delay_off_show(struct device *dev,
  51                struct device_attribute *attr, char *buf)
  52{
  53        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  54
  55        return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
  56}
  57
  58static ssize_t led_delay_off_store(struct device *dev,
  59                struct device_attribute *attr, const char *buf, size_t size)
  60{
  61        struct led_classdev *led_cdev = dev_get_drvdata(dev);
  62        int ret = -EINVAL;
  63        char *after;
  64        unsigned long state = simple_strtoul(buf, &after, 10);
  65        size_t count = after - buf;
  66
  67        if (isspace(*after))
  68                count++;
  69
  70        if (count == size) {
  71                led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
  72                ret = count;
  73        }
  74
  75        return ret;
  76}
  77
  78static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
  79static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
  80
  81static void timer_trig_activate(struct led_classdev *led_cdev)
  82{
  83        int rc;
  84
  85        led_cdev->trigger_data = NULL;
  86
  87        rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
  88        if (rc)
  89                return;
  90        rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
  91        if (rc)
  92                goto err_out_delayon;
  93
  94        led_cdev->trigger_data = (void *)1;
  95
  96        return;
  97
  98err_out_delayon:
  99        device_remove_file(led_cdev->dev, &dev_attr_delay_on);
 100}
 101
 102static void timer_trig_deactivate(struct led_classdev *led_cdev)
 103{
 104        if (led_cdev->trigger_data) {
 105                device_remove_file(led_cdev->dev, &dev_attr_delay_on);
 106                device_remove_file(led_cdev->dev, &dev_attr_delay_off);
 107        }
 108
 109        /* Stop blinking */
 110        led_brightness_set(led_cdev, LED_OFF);
 111}
 112
 113static struct led_trigger timer_led_trigger = {
 114        .name     = "timer",
 115        .activate = timer_trig_activate,
 116        .deactivate = timer_trig_deactivate,
 117};
 118
 119static int __init timer_trig_init(void)
 120{
 121        return led_trigger_register(&timer_led_trigger);
 122}
 123
 124static void __exit timer_trig_exit(void)
 125{
 126        led_trigger_unregister(&timer_led_trigger);
 127}
 128
 129module_init(timer_trig_init);
 130module_exit(timer_trig_exit);
 131
 132MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
 133MODULE_DESCRIPTION("Timer LED trigger");
 134MODULE_LICENSE("GPL");
 135