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leds-lart.c

/*
 * 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.
 */
#include <linux/init.h>

#include <mach/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_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);
}

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