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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/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>

#include <asm/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 spinlock_t leds_lock = SPIN_LOCK_UNLOCKED;

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() || machine_is_co285())
        leds_event = ebsa285_leds_event;

    leds_event(led_start);

    return 0;
}

__initcall(leds_init);

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