[net-next-2.6.git] / drivers / leds / ledtrig-timer.c

/*
 * LED Kernel Timer Trigger
 *
 * Copyright 2005-2006 Openedhand Ltd.
 *
 * Author: Richard Purdie <rpurdie@openedhand.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include "leds.h"

struct timer_trig_data {
	int brightness_on;		/* LED brightness during "on" period.
					 * (LED_OFF < brightness_on <= LED_FULL)
					 */
	unsigned long delay_on;		/* milliseconds on */
	unsigned long delay_off;	/* milliseconds off */
	struct timer_list timer;
};

static void led_timer_function(unsigned long data)
{
	struct led_classdev *led_cdev = (struct led_classdev *) data;
	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	unsigned long brightness;
	unsigned long delay;

	if (!timer_data->delay_on || !timer_data->delay_off) {
		led_set_brightness(led_cdev, LED_OFF);
		return;
	}

	brightness = led_get_brightness(led_cdev);
	if (!brightness) {
		/* Time to switch the LED on. */
		brightness = timer_data->brightness_on;
		delay = timer_data->delay_on;
	} else {
		/* Store the current brightness value to be able
		 * to restore it when the delay_off period is over.
		 */
		timer_data->brightness_on = brightness;
		brightness = LED_OFF;
		delay = timer_data->delay_off;
	}

	led_set_brightness(led_cdev, brightness);

	mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay));
}

static ssize_t led_delay_on_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct timer_trig_data *timer_data = led_cdev->trigger_data;

	return sprintf(buf, "%lu\n", timer_data->delay_on);
}

static ssize_t led_delay_on_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	int ret = -EINVAL;
	char *after;
	unsigned long state = simple_strtoul(buf, &after, 10);
	size_t count = after - buf;

	if (*after && isspace(*after))
		count++;

	if (count == size) {
		if (timer_data->delay_on != state) {
			/* the new value differs from the previous */
			timer_data->delay_on = state;

			/* deactivate previous settings */
			del_timer_sync(&timer_data->timer);

			/* try to activate hardware acceleration, if any */
			if (!led_cdev->blink_set ||
			    led_cdev->blink_set(led_cdev,
			      &timer_data->delay_on, &timer_data->delay_off)) {
				/* no hardware acceleration, blink via timer */
				mod_timer(&timer_data->timer, jiffies + 1);
			}
		}
		ret = count;
	}

	return ret;
}

static ssize_t led_delay_off_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct timer_trig_data *timer_data = led_cdev->trigger_data;

	return sprintf(buf, "%lu\n", timer_data->delay_off);
}

static ssize_t led_delay_off_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	int ret = -EINVAL;
	char *after;
	unsigned long state = simple_strtoul(buf, &after, 10);
	size_t count = after - buf;

	if (*after && isspace(*after))
		count++;

	if (count == size) {
		if (timer_data->delay_off != state) {
			/* the new value differs from the previous */
			timer_data->delay_off = state;

			/* deactivate previous settings */
			del_timer_sync(&timer_data->timer);

			/* try to activate hardware acceleration, if any */
			if (!led_cdev->blink_set ||
			    led_cdev->blink_set(led_cdev,
			      &timer_data->delay_on, &timer_data->delay_off)) {
				/* no hardware acceleration, blink via timer */
				mod_timer(&timer_data->timer, jiffies + 1);
			}
		}
		ret = count;
	}

	return ret;
}

static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);

static void timer_trig_activate(struct led_classdev *led_cdev)
{
	struct timer_trig_data *timer_data;
	int rc;

	timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL);
	if (!timer_data)
		return;

	timer_data->brightness_on = led_get_brightness(led_cdev);
	if (timer_data->brightness_on == LED_OFF)
		timer_data->brightness_on = led_cdev->max_brightness;
	led_cdev->trigger_data = timer_data;

	init_timer(&timer_data->timer);
	timer_data->timer.function = led_timer_function;
	timer_data->timer.data = (unsigned long) led_cdev;

	rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
	if (rc)
		goto err_out;
	rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
	if (rc)
		goto err_out_delayon;

	/* If there is hardware support for blinking, start one
	 * user friendly blink rate chosen by the driver.
	 */
	if (led_cdev->blink_set)
		led_cdev->blink_set(led_cdev,
			&timer_data->delay_on, &timer_data->delay_off);

	return;

err_out_delayon:
	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
err_out:
	led_cdev->trigger_data = NULL;
	kfree(timer_data);
}

static void timer_trig_deactivate(struct led_classdev *led_cdev)
{
	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	unsigned long on = 0, off = 0;

	if (timer_data) {
		device_remove_file(led_cdev->dev, &dev_attr_delay_on);
		device_remove_file(led_cdev->dev, &dev_attr_delay_off);
		del_timer_sync(&timer_data->timer);
		kfree(timer_data);
	}

	/* If there is hardware support for blinking, stop it */
	if (led_cdev->blink_set)
		led_cdev->blink_set(led_cdev, &on, &off);
}

static struct led_trigger timer_led_trigger = {
	.name     = "timer",
	.activate = timer_trig_activate,
	.deactivate = timer_trig_deactivate,
};

static int __init timer_trig_init(void)
{
	return led_trigger_register(&timer_led_trigger);
}

static void __exit timer_trig_exit(void)
{
	led_trigger_unregister(&timer_led_trigger);
}

module_init(timer_trig_init);
module_exit(timer_trig_exit);

MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
MODULE_DESCRIPTION("Timer LED trigger");
MODULE_LICENSE("GPL");
Commit	Line	Data
6655c6fe RP	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
6655c6fe	14	#include <linux/module.h>
f6a57033	15	#include <linux/jiffies.h>
6655c6fe RP	16	#include <linux/kernel.h>
	17	#include <linux/init.h>
	18	#include <linux/list.h>
	19	#include <linux/spinlock.h>
	20	#include <linux/device.h>
	21	#include <linux/sysdev.h>
	22	#include <linux/timer.h>
3dc7b82e	23	#include <linux/ctype.h>
6655c6fe RP	24	#include <linux/leds.h>
	25	#include "leds.h"
	26
	27	struct timer_trig_data {
0013b23d NM	28	int brightness_on; /* LED brightness during "on" period.
	29	* (LED_OFF < brightness_on <= LED_FULL)
	30	*/
6655c6fe RP	31	unsigned long delay_on; /* milliseconds on */
	32	unsigned long delay_off; /* milliseconds off */
	33	struct timer_list timer;
	34	};
	35
	36	static void led_timer_function(unsigned long data)
	37	{
	38	struct led_classdev led_cdev = (struct led_classdev ) data;
	39	struct timer_trig_data *timer_data = led_cdev->trigger_data;
0013b23d NM	40	unsigned long brightness;
0013b23d NM	41	unsigned long delay;
6655c6fe RP	42
	43	if (!timer_data->delay_on \|\| !timer_data->delay_off) {
	44	led_set_brightness(led_cdev, LED_OFF);
	45	return;
	46	}
	47
0013b23d NM	48	brightness = led_get_brightness(led_cdev);
	49	if (!brightness) {
	50	/* Time to switch the LED on. */
	51	brightness = timer_data->brightness_on;
6655c6fe	52	delay = timer_data->delay_on;
0013b23d NM	53	} else {
	54	/* Store the current brightness value to be able
	55	* to restore it when the delay_off period is over.
	56	*/
	57	timer_data->brightness_on = brightness;
	58	brightness = LED_OFF;
	59	delay = timer_data->delay_off;
6655c6fe RP	60	}
	61
	62	led_set_brightness(led_cdev, brightness);
	63
	64	mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay));
	65	}
	66
4d404fd5	67	static ssize_t led_delay_on_show(struct device *dev,
f8a7c6fe	68	struct device_attribute attr, char buf)
6655c6fe	69	{
f8a7c6fe	70	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	71	struct timer_trig_data *timer_data = led_cdev->trigger_data;
6655c6fe RP	72
dd8e5a20	73	return sprintf(buf, "%lu\n", timer_data->delay_on);
6655c6fe RP	74	}
6655c6fe RP	75
4d404fd5	76	static ssize_t led_delay_on_store(struct device *dev,
f8a7c6fe	77	struct device_attribute attr, const char buf, size_t size)
6655c6fe	78	{
f8a7c6fe	79	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	80	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	81	int ret = -EINVAL;
	82	char *after;
	83	unsigned long state = simple_strtoul(buf, &after, 10);
3dc7b82e	84	size_t count = after - buf;
6655c6fe	85
3dc7b82e RP	86	if (after && isspace(after))
	87	count++;
	88
	89	if (count == size) {
4c79141d MN	90	if (timer_data->delay_on != state) {
	91	/* the new value differs from the previous */
	92	timer_data->delay_on = state;
	93
	94	/* deactivate previous settings */
	95	del_timer_sync(&timer_data->timer);
	96
	97	/* try to activate hardware acceleration, if any */
	98	if (!led_cdev->blink_set \|\|
	99	led_cdev->blink_set(led_cdev,
4d404fd5	100	&timer_data->delay_on, &timer_data->delay_off)) {
4c79141d MN	101	/* no hardware acceleration, blink via timer */
	102	mod_timer(&timer_data->timer, jiffies + 1);
	103	}
	104	}
3dc7b82e	105	ret = count;
6655c6fe RP	106	}
	107
	108	return ret;
	109	}
	110
4d404fd5	111	static ssize_t led_delay_off_show(struct device *dev,
f8a7c6fe	112	struct device_attribute attr, char buf)
6655c6fe	113	{
f8a7c6fe	114	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	115	struct timer_trig_data *timer_data = led_cdev->trigger_data;
6655c6fe RP	116
dd8e5a20	117	return sprintf(buf, "%lu\n", timer_data->delay_off);
6655c6fe RP	118	}
6655c6fe RP	119
4d404fd5	120	static ssize_t led_delay_off_store(struct device *dev,
f8a7c6fe	121	struct device_attribute attr, const char buf, size_t size)
6655c6fe	122	{
f8a7c6fe	123	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	124	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	125	int ret = -EINVAL;
	126	char *after;
	127	unsigned long state = simple_strtoul(buf, &after, 10);
3dc7b82e RP	128	size_t count = after - buf;
	129
	130	if (after && isspace(after))
	131	count++;
6655c6fe	132
3dc7b82e	133	if (count == size) {
4c79141d MN	134	if (timer_data->delay_off != state) {
	135	/* the new value differs from the previous */
	136	timer_data->delay_off = state;
	137
	138	/* deactivate previous settings */
	139	del_timer_sync(&timer_data->timer);
	140
	141	/* try to activate hardware acceleration, if any */
	142	if (!led_cdev->blink_set \|\|
	143	led_cdev->blink_set(led_cdev,
4d404fd5	144	&timer_data->delay_on, &timer_data->delay_off)) {
4c79141d MN	145	/* no hardware acceleration, blink via timer */
	146	mod_timer(&timer_data->timer, jiffies + 1);
	147	}
	148	}
3dc7b82e	149	ret = count;
6655c6fe RP	150	}
	151
	152	return ret;
	153	}
	154
f8a7c6fe RP	155	static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
f8a7c6fe RP	156	static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
6655c6fe RP	157
	158	static void timer_trig_activate(struct led_classdev *led_cdev)
	159	{
	160	struct timer_trig_data *timer_data;
12fda168	161	int rc;
6655c6fe RP	162
	163	timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL);
	164	if (!timer_data)
	165	return;
	166
0013b23d NM	167	timer_data->brightness_on = led_get_brightness(led_cdev);
0013b23d NM	168	if (timer_data->brightness_on == LED_OFF)
1bd465e6	169	timer_data->brightness_on = led_cdev->max_brightness;
6655c6fe RP	170	led_cdev->trigger_data = timer_data;
	171
	172	init_timer(&timer_data->timer);
	173	timer_data->timer.function = led_timer_function;
	174	timer_data->timer.data = (unsigned long) led_cdev;
	175
f8a7c6fe RP	176	rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
	177	if (rc)
	178	goto err_out;
	179	rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
	180	if (rc)
	181	goto err_out_delayon;
12fda168	182
4c79141d MN	183	/* If there is hardware support for blinking, start one
	184	* user friendly blink rate chosen by the driver.
	185	*/
	186	if (led_cdev->blink_set)
	187	led_cdev->blink_set(led_cdev,
	188	&timer_data->delay_on, &timer_data->delay_off);
	189
12fda168 JG	190	return;
	191
	192	err_out_delayon:
f8a7c6fe	193	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
12fda168 JG	194	err_out:
	195	led_cdev->trigger_data = NULL;
	196	kfree(timer_data);
6655c6fe RP	197	}
	198
	199	static void timer_trig_deactivate(struct led_classdev *led_cdev)
	200	{
	201	struct timer_trig_data *timer_data = led_cdev->trigger_data;
ce70a245	202	unsigned long on = 0, off = 0;
6655c6fe RP	203
6655c6fe RP	204	if (timer_data) {
f8a7c6fe RP	205	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
f8a7c6fe RP	206	device_remove_file(led_cdev->dev, &dev_attr_delay_off);
6655c6fe RP	207	del_timer_sync(&timer_data->timer);
	208	kfree(timer_data);
	209	}
ce70a245 RG	210
	211	/* If there is hardware support for blinking, stop it */
	212	if (led_cdev->blink_set)
	213	led_cdev->blink_set(led_cdev, &on, &off);
6655c6fe RP	214	}
	215
	216	static struct led_trigger timer_led_trigger = {
	217	.name = "timer",
	218	.activate = timer_trig_activate,
	219	.deactivate = timer_trig_deactivate,
	220	};
	221
	222	static int __init timer_trig_init(void)
	223	{
	224	return led_trigger_register(&timer_led_trigger);
	225	}
	226
	227	static void __exit timer_trig_exit(void)
	228	{
	229	led_trigger_unregister(&timer_led_trigger);
	230	}
	231
	232	module_init(timer_trig_init);
	233	module_exit(timer_trig_exit);
	234
	235	MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
	236	MODULE_DESCRIPTION("Timer LED trigger");
	237	MODULE_LICENSE("GPL");