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/*
* LED trigger support for barebox
*
* (C) Copyright 2010 Sascha Hauer, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <poller.h>
#include <errno.h>
#include <clock.h>
#include <led.h>
#include <init.h>
/**
* @file
* @brief LED trigger framework
*
* This file contains triggers which can be associated to LEDs.
*
* With this framework LEDs can be associated to different events.
* An event can be a heartbeat, network activity or panic.
* led_trigger() is the central function which is called in the
* different barebox frameworks to trigger an event.
*
* currently there are the following triggers are defined:
*
* led_trigger_panic: triggered in panic()
* led_trigger_heartbeat: shows the heartbeat of barebox. Blinks as long
* barebox is up and running.
* led_trigger_net_rx: Triggered during network packet reception
* led_trigger_net_tx: Triggered during network packet transmission
* led_trigger_net_txrx: combination of the two above
*/
struct led_trigger_struct {
struct led *led;
struct list_head list;
enum led_trigger trigger;
};
static struct led_trigger_struct triggers[LED_TRIGGER_MAX];
/**
* led_trigger - triggers a trigger
* @param trigger The trigger to enable/disable
* @param enable true if enable
*
* Enable/disable a LED for a given trigger.
*/
void led_trigger(enum led_trigger trigger, enum trigger_type type)
{
if (trigger >= LED_TRIGGER_MAX)
return;
if (!triggers[trigger].led)
return;
if (type == TRIGGER_FLASH) {
led_flash(triggers[trigger].led, 200);
return;
}
led_set(triggers[trigger].led, type == TRIGGER_ENABLE ? triggers[trigger].led->max_value : 0);
}
/**
* led_set_trigger - set the LED for a trigger
* @param trigger The trigger to set a LED for
* @param led The LED
*
* This function associates a trigger with a LED. Pass led = NULL
* to disable a trigger
*/
int led_set_trigger(enum led_trigger trigger, struct led *led)
{
int i;
if (trigger >= LED_TRIGGER_MAX)
return -EINVAL;
if (led)
for (i = 0; i < LED_TRIGGER_MAX; i++)
if (triggers[i].led == led)
return -EBUSY;
if (triggers[trigger].led && !led)
led_set(triggers[trigger].led, 0);
triggers[trigger].led = led;
if (led && trigger == LED_TRIGGER_DEFAULT_ON)
led_set(triggers[trigger].led, triggers[trigger].led->max_value);
if (led && trigger == LED_TRIGGER_HEARTBEAT)
led_blink(led, 200, 1000);
return 0;
}
/**
* led_get_trigger - get the LED for a trigger
* @param trigger The trigger to set a LED for
*
* return the LED number of a trigger.
*/
int led_get_trigger(enum led_trigger trigger)
{
if (trigger >= LED_TRIGGER_MAX)
return -EINVAL;
if (!triggers[trigger].led)
return -ENODEV;
return led_get_number(triggers[trigger].led);
}
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