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!C99Shell v. 1.0 pre-release build #13!
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/*
 * linux/arch/arm/mach-sa1100/leds-brutus.c
 *
 * Copyright (C) 2000 Nicolas Pitre
 *
 * Brutus uses the LEDs as follows:
 *   - D3 (Green, GPIO9) - toggles state every 50 timer interrupts
 *   - D17 (Red, GPIO20) - on if system is not idle
 *   - D4 (Green, GPIO8) - misc function
 */
#include <linux/config.h>
#include <linux/init.h>

#include <asm/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>

#include "leds.h"


#define LED_STATE_ENABLED    1
#define LED_STATE_CLAIMED    2

static unsigned int led_state;
static unsigned int hw_led_state;

#define LED_D3        GPIO_GPIO(9)
#define LED_D4        GPIO_GPIO(8)
#define LED_D17        GPIO_GPIO(20)
#define LED_MASK    (LED_D3|LED_D4|LED_D17)

void brutus_leds_event(led_event_t evt)
{
    unsigned long flags;

    local_irq_save(flags);

    switch (evt) {
    case led_start:
        hw_led_state = LED_MASK;
        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 = LED_MASK;
        break;

    case led_release:
        led_state &= ~LED_STATE_CLAIMED;
        hw_led_state = LED_MASK;
        break;

#ifdef CONFIG_LEDS_TIMER
    case led_timer:
        if (!(led_state & LED_STATE_CLAIMED))
            hw_led_state ^= LED_D3;
        break;
#endif

#ifdef CONFIG_LEDS_CPU
    case led_idle_start:
        if (!(led_state & LED_STATE_CLAIMED))
            hw_led_state |= LED_D17;
        break;

    case led_idle_end:
        if (!(led_state & LED_STATE_CLAIMED))
            hw_led_state &= ~LED_D17;
        break;
#endif

    case led_green_on:
        hw_led_state &= ~LED_D4;
        break;

    case led_green_off:
        hw_led_state |= LED_D4;
        break;

    case led_amber_on:
        break;

    case led_amber_off:
        break;

    case led_red_on:
        if (led_state & LED_STATE_CLAIMED)
            hw_led_state &= ~LED_D17;
        break;

    case led_red_off:
        if (led_state & LED_STATE_CLAIMED)
            hw_led_state |= LED_D17;
        break;

    default:
        break;
    }

    if  (led_state & LED_STATE_ENABLED) {
        GPSR = hw_led_state;
        GPCR = hw_led_state ^ LED_MASK;
    }

    local_irq_restore(flags);
}

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