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 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17 #include <linux/ctype.h>
  18 #include <linux/leds.h>
  19
  20 static ssize_t led_delay_on_show(struct device *dev,
  21                 struct device_attribute *attr, char *buf)
  22 {
  23         struct led_classdev *led_cdev = led_trigger_get_led(dev);
  24
  25         return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
  26 }
  27
  28 static ssize_t led_delay_on_store(struct device *dev,
  29                 struct device_attribute *attr, const char *buf, size_t size)
  30 {
  31         struct led_classdev *led_cdev = led_trigger_get_led(dev);
  32         unsigned long state;
  33         ssize_t ret = -EINVAL;
  34
  35         ret = kstrtoul(buf, 10, &state);
  36         if (ret)
  37                 return ret;
  38
  39         led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
  40         led_cdev->blink_delay_on = state;
  41
  42         return size;
  43 }
  44
  45 static ssize_t led_delay_off_show(struct device *dev,
  46                 struct device_attribute *attr, char *buf)
  47 {
  48         struct led_classdev *led_cdev = led_trigger_get_led(dev);
  49
  50         return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
  51 }
  52
  53 static ssize_t led_delay_off_store(struct device *dev,
  54                 struct device_attribute *attr, const char *buf, size_t size)
  55 {
  56         struct led_classdev *led_cdev = led_trigger_get_led(dev);
  57         unsigned long state;
  58         ssize_t ret = -EINVAL;
  59
  60         ret = kstrtoul(buf, 10, &state);
  61         if (ret)
  62                 return ret;
  63
  64         led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
  65         led_cdev->blink_delay_off = state;
  66
  67         return size;
  68 }
  69
  70 static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
  71 static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
  72
  73 static struct attribute *timer_trig_attrs[] = {
  74         &dev_attr_delay_on.attr,
  75         &dev_attr_delay_off.attr,
  76         NULL
  77 };
  78 ATTRIBUTE_GROUPS(timer_trig);
  79
  80 static int timer_trig_activate(struct led_classdev *led_cdev)
  81 {
  82         led_blink_set(led_cdev, &led_cdev->blink_delay_on,
  83                       &led_cdev->blink_delay_off);
  84
  85         return 0;
  86 }
  87
  88 static void timer_trig_deactivate(struct led_classdev *led_cdev)
  89 {
  90         /* Stop blinking */
  91         led_set_brightness(led_cdev, LED_OFF);
  92 }
  93
  94 static struct led_trigger timer_led_trigger = {
  95         .name     = "timer",
  96         .activate = timer_trig_activate,
  97         .deactivate = timer_trig_deactivate,
  98         .groups = timer_trig_groups,
  99 };
 100 module_led_trigger(timer_led_trigger);
 101
 102 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
 103 MODULE_DESCRIPTION("Timer LED trigger");
 104 MODULE_LICENSE("GPL v2");