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leds-hackkit.c

/*
 * linux/arch/arm/mach-sa1100/leds-hackkit.c
 *
 * based on leds-lart.c
 *
 * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
 * (C) Stefan Eletzhofer <stefan.eletzhofer@eletztrick.de>, 2002
 *
 * The HackKit has two leds (GPIO 22/23). The red led (gpio 22) is used
 * as cpu led, the green one is used as timer 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_GREEN    GPIO_GPIO23
#define LED_RED    GPIO_GPIO22
#define LED_MASK  (LED_RED | LED_GREEN)

void hackkit_leds_event(led_event_t evt)
{
      unsigned long flags;

      local_irq_save(flags);

      switch(evt) {
            case led_start:
                  /* pin 22/23 are outputs */
                  GPDR |= LED_MASK;
                  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_GREEN;
                  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_RED;
                  break;

            case led_idle_end:
                  /* ... and on if the system is not idle */
                  if (!(led_state & LED_STATE_CLAIMED))
                        hw_led_state |= LED_RED;
                  break;
#endif

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

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

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

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