提交 891c668b 编写于 作者: A Atsushi Nemoto 提交者: Linus Torvalds

[PATCH] LED: add LED heartbeat trigger

Add an LED trigger acts like a heart beat.  This can be used as a
replacement of CONFIG_HEARTBEAT code exists in some arch's timer code.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: NRichard Purdie <rpurdie@rpsys.net>
Cc: "Nish Aravamudan" <nish.aravamudan@gmail.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 fa9799e3
...@@ -93,5 +93,14 @@ config LEDS_TRIGGER_IDE_DISK ...@@ -93,5 +93,14 @@ config LEDS_TRIGGER_IDE_DISK
This allows LEDs to be controlled by IDE disk activity. This allows LEDs to be controlled by IDE disk activity.
If unsure, say Y. If unsure, say Y.
config LEDS_TRIGGER_HEARTBEAT
tristate "LED Heartbeat Trigger"
depends LEDS_TRIGGERS
help
This allows LEDs to be controlled by a CPU load average.
The flash frequency is a hyperbolic function of the 1-minute
load average.
If unsure, say Y.
endmenu endmenu
...@@ -16,3 +16,4 @@ obj-$(CONFIG_LEDS_AMS_DELTA) += leds-ams-delta.o ...@@ -16,3 +16,4 @@ obj-$(CONFIG_LEDS_AMS_DELTA) += leds-ams-delta.o
# LED Triggers # LED Triggers
obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o
obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK) += ledtrig-ide-disk.o obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK) += ledtrig-ide-disk.o
obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
/*
* LED Heartbeat Trigger
*
* Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
*
* Based on Richard Purdie's ledtrig-timer.c and some arch's
* CONFIG_HEARTBEAT code.
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/leds.h>
#include "leds.h"
struct heartbeat_trig_data {
unsigned int phase;
unsigned int period;
struct timer_list timer;
};
static void led_heartbeat_function(unsigned long data)
{
struct led_classdev *led_cdev = (struct led_classdev *) data;
struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
unsigned long brightness = LED_OFF;
unsigned long delay = 0;
/* acts like an actual heart beat -- ie thump-thump-pause... */
switch (heartbeat_data->phase) {
case 0:
/*
* The hyperbolic function below modifies the
* heartbeat period length in dependency of the
* current (1min) load. It goes through the points
* f(0)=1260, f(1)=860, f(5)=510, f(inf)->300.
*/
heartbeat_data->period = 300 +
(6720 << FSHIFT) / (5 * avenrun[0] + (7 << FSHIFT));
heartbeat_data->period =
msecs_to_jiffies(heartbeat_data->period);
delay = msecs_to_jiffies(70);
heartbeat_data->phase++;
brightness = LED_FULL;
break;
case 1:
delay = heartbeat_data->period / 4 - msecs_to_jiffies(70);
heartbeat_data->phase++;
break;
case 2:
delay = msecs_to_jiffies(70);
heartbeat_data->phase++;
brightness = LED_FULL;
break;
default:
delay = heartbeat_data->period - heartbeat_data->period / 4 -
msecs_to_jiffies(70);
heartbeat_data->phase = 0;
break;
}
led_set_brightness(led_cdev, brightness);
mod_timer(&heartbeat_data->timer, jiffies + delay);
}
static void heartbeat_trig_activate(struct led_classdev *led_cdev)
{
struct heartbeat_trig_data *heartbeat_data;
heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL);
if (!heartbeat_data)
return;
led_cdev->trigger_data = heartbeat_data;
setup_timer(&heartbeat_data->timer,
led_heartbeat_function, (unsigned long) led_cdev);
heartbeat_data->phase = 0;
led_heartbeat_function(heartbeat_data->timer.data);
}
static void heartbeat_trig_deactivate(struct led_classdev *led_cdev)
{
struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
if (heartbeat_data) {
del_timer_sync(&heartbeat_data->timer);
kfree(heartbeat_data);
}
}
static struct led_trigger heartbeat_led_trigger = {
.name = "heartbeat",
.activate = heartbeat_trig_activate,
.deactivate = heartbeat_trig_deactivate,
};
static int __init heartbeat_trig_init(void)
{
return led_trigger_register(&heartbeat_led_trigger);
}
static void __exit heartbeat_trig_exit(void)
{
led_trigger_unregister(&heartbeat_led_trigger);
}
module_init(heartbeat_trig_init);
module_exit(heartbeat_trig_exit);
MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
MODULE_DESCRIPTION("Heartbeat LED trigger");
MODULE_LICENSE("GPL");
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