[mirror_ubuntu-bionic-kernel.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 <linux/slab.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 (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 (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	24	#include <linux/leds.h>
5a0e3ad6	25	#include <linux/slab.h>
6655c6fe RP	26	#include "leds.h"
	27
	28	struct timer_trig_data {
0013b23d NM	29	int brightness_on; /* LED brightness during "on" period.
	30	* (LED_OFF < brightness_on <= LED_FULL)
	31	*/
6655c6fe RP	32	unsigned long delay_on; /* milliseconds on */
	33	unsigned long delay_off; /* milliseconds off */
	34	struct timer_list timer;
	35	};
	36
	37	static void led_timer_function(unsigned long data)
	38	{
	39	struct led_classdev led_cdev = (struct led_classdev ) data;
	40	struct timer_trig_data *timer_data = led_cdev->trigger_data;
0013b23d NM	41	unsigned long brightness;
0013b23d NM	42	unsigned long delay;
6655c6fe RP	43
	44	if (!timer_data->delay_on \|\| !timer_data->delay_off) {
	45	led_set_brightness(led_cdev, LED_OFF);
	46	return;
	47	}
	48
0013b23d NM	49	brightness = led_get_brightness(led_cdev);
	50	if (!brightness) {
	51	/* Time to switch the LED on. */
	52	brightness = timer_data->brightness_on;
6655c6fe	53	delay = timer_data->delay_on;
0013b23d NM	54	} else {
	55	/* Store the current brightness value to be able
	56	* to restore it when the delay_off period is over.
	57	*/
	58	timer_data->brightness_on = brightness;
	59	brightness = LED_OFF;
	60	delay = timer_data->delay_off;
6655c6fe RP	61	}
	62
	63	led_set_brightness(led_cdev, brightness);
	64
	65	mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay));
	66	}
	67
4d404fd5	68	static ssize_t led_delay_on_show(struct device *dev,
f8a7c6fe	69	struct device_attribute attr, char buf)
6655c6fe	70	{
f8a7c6fe	71	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	72	struct timer_trig_data *timer_data = led_cdev->trigger_data;
6655c6fe RP	73
dd8e5a20	74	return sprintf(buf, "%lu\n", timer_data->delay_on);
6655c6fe RP	75	}
6655c6fe RP	76
4d404fd5	77	static ssize_t led_delay_on_store(struct device *dev,
f8a7c6fe	78	struct device_attribute attr, const char buf, size_t size)
6655c6fe	79	{
f8a7c6fe	80	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	81	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	82	int ret = -EINVAL;
	83	char *after;
	84	unsigned long state = simple_strtoul(buf, &after, 10);
3dc7b82e	85	size_t count = after - buf;
6655c6fe	86
e7d2860b	87	if (isspace(*after))
3dc7b82e RP	88	count++;
	89
	90	if (count == size) {
4c79141d MN	91	if (timer_data->delay_on != state) {
	92	/* the new value differs from the previous */
	93	timer_data->delay_on = state;
	94
	95	/* deactivate previous settings */
	96	del_timer_sync(&timer_data->timer);
	97
	98	/* try to activate hardware acceleration, if any */
	99	if (!led_cdev->blink_set \|\|
	100	led_cdev->blink_set(led_cdev,
4d404fd5	101	&timer_data->delay_on, &timer_data->delay_off)) {
4c79141d MN	102	/* no hardware acceleration, blink via timer */
	103	mod_timer(&timer_data->timer, jiffies + 1);
	104	}
	105	}
3dc7b82e	106	ret = count;
6655c6fe RP	107	}
	108
	109	return ret;
	110	}
	111
4d404fd5	112	static ssize_t led_delay_off_show(struct device *dev,
f8a7c6fe	113	struct device_attribute attr, char buf)
6655c6fe	114	{
f8a7c6fe	115	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	116	struct timer_trig_data *timer_data = led_cdev->trigger_data;
6655c6fe RP	117
dd8e5a20	118	return sprintf(buf, "%lu\n", timer_data->delay_off);
6655c6fe RP	119	}
6655c6fe RP	120
4d404fd5	121	static ssize_t led_delay_off_store(struct device *dev,
f8a7c6fe	122	struct device_attribute attr, const char buf, size_t size)
6655c6fe	123	{
f8a7c6fe	124	struct led_classdev *led_cdev = dev_get_drvdata(dev);
6655c6fe RP	125	struct timer_trig_data *timer_data = led_cdev->trigger_data;
	126	int ret = -EINVAL;
	127	char *after;
	128	unsigned long state = simple_strtoul(buf, &after, 10);
3dc7b82e RP	129	size_t count = after - buf;
3dc7b82e RP	130
e7d2860b	131	if (isspace(*after))
3dc7b82e	132	count++;
6655c6fe	133
3dc7b82e	134	if (count == size) {
4c79141d MN	135	if (timer_data->delay_off != state) {
	136	/* the new value differs from the previous */
	137	timer_data->delay_off = state;
	138
	139	/* deactivate previous settings */
	140	del_timer_sync(&timer_data->timer);
	141
	142	/* try to activate hardware acceleration, if any */
	143	if (!led_cdev->blink_set \|\|
	144	led_cdev->blink_set(led_cdev,
4d404fd5	145	&timer_data->delay_on, &timer_data->delay_off)) {
4c79141d MN	146	/* no hardware acceleration, blink via timer */
	147	mod_timer(&timer_data->timer, jiffies + 1);
	148	}
	149	}
3dc7b82e	150	ret = count;
6655c6fe RP	151	}
	152
	153	return ret;
	154	}
	155
f8a7c6fe RP	156	static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
f8a7c6fe RP	157	static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
6655c6fe RP	158
	159	static void timer_trig_activate(struct led_classdev *led_cdev)
	160	{
	161	struct timer_trig_data *timer_data;
12fda168	162	int rc;
6655c6fe RP	163
	164	timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL);
	165	if (!timer_data)
	166	return;
	167
0013b23d NM	168	timer_data->brightness_on = led_get_brightness(led_cdev);
0013b23d NM	169	if (timer_data->brightness_on == LED_OFF)
1bd465e6	170	timer_data->brightness_on = led_cdev->max_brightness;
6655c6fe RP	171	led_cdev->trigger_data = timer_data;
	172
	173	init_timer(&timer_data->timer);
	174	timer_data->timer.function = led_timer_function;
	175	timer_data->timer.data = (unsigned long) led_cdev;
	176
f8a7c6fe RP	177	rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
	178	if (rc)
	179	goto err_out;
	180	rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
	181	if (rc)
	182	goto err_out_delayon;
12fda168	183
4c79141d MN	184	/* If there is hardware support for blinking, start one
	185	* user friendly blink rate chosen by the driver.
	186	*/
	187	if (led_cdev->blink_set)
	188	led_cdev->blink_set(led_cdev,
	189	&timer_data->delay_on, &timer_data->delay_off);
	190
12fda168 JG	191	return;
	192
	193	err_out_delayon:
f8a7c6fe	194	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
12fda168 JG	195	err_out:
	196	led_cdev->trigger_data = NULL;
	197	kfree(timer_data);
6655c6fe RP	198	}
	199
	200	static void timer_trig_deactivate(struct led_classdev *led_cdev)
	201	{
	202	struct timer_trig_data *timer_data = led_cdev->trigger_data;
ce70a245	203	unsigned long on = 0, off = 0;
6655c6fe RP	204
6655c6fe RP	205	if (timer_data) {
f8a7c6fe RP	206	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
f8a7c6fe RP	207	device_remove_file(led_cdev->dev, &dev_attr_delay_off);
6655c6fe RP	208	del_timer_sync(&timer_data->timer);
	209	kfree(timer_data);
	210	}
ce70a245 RG	211
	212	/* If there is hardware support for blinking, stop it */
	213	if (led_cdev->blink_set)
	214	led_cdev->blink_set(led_cdev, &on, &off);
6655c6fe RP	215	}
	216
	217	static struct led_trigger timer_led_trigger = {
	218	.name = "timer",
	219	.activate = timer_trig_activate,
	220	.deactivate = timer_trig_deactivate,
	221	};
	222
	223	static int __init timer_trig_init(void)
	224	{
	225	return led_trigger_register(&timer_led_trigger);
	226	}
	227
	228	static void __exit timer_trig_exit(void)
	229	{
	230	led_trigger_unregister(&timer_led_trigger);
	231	}
	232
	233	module_init(timer_trig_init);
	234	module_exit(timer_trig_exit);
	235
	236	MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
	237	MODULE_DESCRIPTION("Timer LED trigger");
	238	MODULE_LICENSE("GPL");