Eric Lee / smarc-fsl-linux-kernel

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arch/arm/mach-sa1100/leds-assabet.c 2.3 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   * 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
   */
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include <linux/init.h>
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  #include <mach/hardware.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include <asm/leds.h>
  #include <asm/system.h>
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  #include <mach/assabet.h>
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  #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);
  }