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/*
* linux/arch/arm/mach-footbridge/ebsa285-leds.c
*
* Copyright (C) 1998-1999 Russell King
*
* 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.
* EBSA-285 control routines.
*
* The EBSA-285 uses the leds as follows:
* - Green - toggles state every 50 timer interrupts
* - Amber - On if system is not idle
* - Red - currently unused
*
* Changelog:
* 02-05-1999 RMK Various cleanups
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/arch/hardware.h>
#include <asm/leds.h>
#include <asm/mach-types.h>
#include <asm/system.h>
#define LED_STATE_ENABLED 1
#define LED_STATE_CLAIMED 2
static char led_state;
static char hw_led_state;
static DEFINE_SPINLOCK(leds_lock);
static void ebsa285_leds_event(led_event_t evt)
{
unsigned long flags;
spin_lock_irqsave(&leds_lock, flags);
switch (evt) {
case led_start:
hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
#ifndef CONFIG_LEDS_CPU
hw_led_state |= XBUS_LED_AMBER;
#endif
led_state |= LED_STATE_ENABLED;
break;
case led_stop:
led_state &= ~LED_STATE_ENABLED;
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
break;
#ifdef CONFIG_LEDS_TIMER
case led_timer:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state ^= XBUS_LED_GREEN;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= XBUS_LED_AMBER;
break;
case led_idle_end:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~XBUS_LED_AMBER;
break;
#endif
case led_halted:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~XBUS_LED_RED;
break;
case led_green_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~XBUS_LED_GREEN;
break;
case led_green_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= XBUS_LED_GREEN;
break;
case led_amber_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~XBUS_LED_AMBER;
break;
case led_amber_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= XBUS_LED_AMBER;
break;
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~XBUS_LED_RED;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= XBUS_LED_RED;
break;
default:
break;
}
if (led_state & LED_STATE_ENABLED)
*XBUS_LEDS = hw_led_state;
spin_unlock_irqrestore(&leds_lock, flags);
}
static int __init leds_init(void)
{
if (machine_is_ebsa285())
leds_event = ebsa285_leds_event;
leds_event(led_start);
return 0;
}
__initcall(leds_init);
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