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leds-assabet.c

/*
 * linux/arch/arm/mach-sa1100/leds-assabet.c
 *
 * Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
 *
 * Original (leds-footbridge.c) by Russell King
 *
 * Assabet uses the LEDs as follows:
 *   - Green - toggles state every 50 timer interrupts
 *   - Red   - on if system is not idle
 */
#include <linux/init.h>

#include <asm/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <asm/arch/assabet.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 ASSABET_BCR_LED_MASK  (ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED)

void assabet_leds_event(led_event_t evt)
{
      unsigned long flags;

      local_irq_save(flags);

      switch (evt) {
      case led_start:
            hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
            led_state = LED_STATE_ENABLED;
            break;

      case led_stop:
            led_state &= ~LED_STATE_ENABLED;
            hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
            ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
            break;

      case led_claim:
            led_state |= LED_STATE_CLAIMED;
            hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
            break;

      case led_release:
            led_state &= ~LED_STATE_CLAIMED;
            hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
            break;

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

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

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

      case led_halted:
            break;

      case led_green_on:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state &= ~ASSABET_BCR_LED_GREEN;
            break;

      case led_green_off:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state |= ASSABET_BCR_LED_GREEN;
            break;

      case led_amber_on:
            break;

      case led_amber_off:
            break;

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

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

      default:
            break;
      }

      if  (led_state & LED_STATE_ENABLED)
            ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);

      local_irq_restore(flags);
}

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