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_brightness_set(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");