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leds.c

/*
 * LED driver for Atmel AT91-based boards.
 *
 *  Copyright (C) SAN People (Pty) Ltd
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>

#include <asm/mach-types.h>
#include <asm/leds.h>
#include <asm/arch/board.h>
#include <asm/arch/gpio.h>


static inline void at91_led_on(unsigned int led)
{
      at91_set_gpio_value(led, 0);
}

static inline void at91_led_off(unsigned int led)
{
      at91_set_gpio_value(led, 1);
}

static inline void at91_led_toggle(unsigned int led)
{
      unsigned long is_off = at91_get_gpio_value(led);
      if (is_off)
            at91_led_on(led);
      else
            at91_led_off(led);
}


/*
 * Handle LED events.
 */
static void at91_leds_event(led_event_t evt)
{
      unsigned long flags;

      local_irq_save(flags);

      switch(evt) {
      case led_start:         /* System startup */
            at91_led_on(at91_leds_cpu);
            break;

      case led_stop:          /* System stop / suspend */
            at91_led_off(at91_leds_cpu);
            break;

#ifdef CONFIG_LEDS_TIMER
      case led_timer:         /* Every 50 timer ticks */
            at91_led_toggle(at91_leds_timer);
            break;
#endif

#ifdef CONFIG_LEDS_CPU
      case led_idle_start:    /* Entering idle state */
            at91_led_off(at91_leds_cpu);
            break;

      case led_idle_end:      /* Exit idle state */
            at91_led_on(at91_leds_cpu);
            break;
#endif

      default:
            break;
      }

      local_irq_restore(flags);
}


static int __init leds_init(void)
{
      if (!at91_leds_timer || !at91_leds_cpu)
            return -ENODEV;

      leds_event = at91_leds_event;

      leds_event(led_start);
      return 0;
}

__initcall(leds_init);

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