Eric Lee / smarc-fsl-linux-kernel

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arch/arm/mach-sa1100/leds-lart.c 1.98 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   * linux/arch/arm/mach-sa1100/leds-lart.c
   *
   * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
   *
   * LART uses the LED as follows:
   *   - GPIO23 is the LED, on if system is not idle
   *  You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
   *  time, but in that case the timer events will still dictate the
   *  pace of the LED.
   */
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include <linux/init.h>
a09e64fbc   Russell King   [ARM] Move includ... 
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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>
  
  #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_23    GPIO_GPIO23
  #define LED_MASK  (LED_23)
  
  void lart_leds_event(led_event_t evt)
  {
  	unsigned long flags;
  
  	local_irq_save(flags);
  
  	switch(evt) {
  	case led_start:
  		/* pin 23 is output pin */
  		GPDR |= LED_23;
  		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_23;
  		break;
  #endif
  
  #ifdef CONFIG_LEDS_CPU
  	case led_idle_start:
  		/* The LART people like the LED to be off when the
                     system is idle... */
  		if (!(led_state & LED_STATE_CLAIMED))
  			hw_led_state &= ~LED_23;
  		break;
  
  	case led_idle_end:
  		/* ... and on if the system is not idle */
  		if (!(led_state & LED_STATE_CLAIMED))
  			hw_led_state |= LED_23;
  		break;
  #endif
  
  	case led_red_on:
  		if (led_state & LED_STATE_CLAIMED)
  			hw_led_state &= ~LED_23;
  		break;
  
  	case led_red_off:
  		if (led_state & LED_STATE_CLAIMED)
  			hw_led_state |= LED_23;
  		break;
  
  	default:
  		break;
  	}
  
  	/* Now set the GPIO state, or nothing will happen at all */
  	if (led_state & LED_STATE_ENABLED) {
  		GPSR = hw_led_state;
  		GPCR = hw_led_state ^ LED_MASK;
  	}
  
  	local_irq_restore(flags);
  }