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leds.c

/*
 * LED driver for KS8695-based boards.
 *
 * Copyright (C) Andrew Victor
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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

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


static inline void ks8695_led_on(unsigned int led)
{
      gpio_set_value(led, 0);
}

static inline void ks8695_led_off(unsigned int led)
{
      gpio_set_value(led, 1);
}

static inline void ks8695_led_toggle(unsigned int led)
{
      unsigned long is_off = gpio_get_value(led);
      if (is_off)
            ks8695_led_on(led);
      else
            ks8695_led_off(led);
}


/*
 * Handle LED events.
 */
static void ks8695_leds_event(led_event_t evt)
{
      unsigned long flags;

      local_irq_save(flags);

      switch(evt) {
      case led_start:         /* System startup */
            ks8695_led_on(ks8695_leds_cpu);
            break;

      case led_stop:          /* System stop / suspend */
            ks8695_led_off(ks8695_leds_cpu);
            break;

#ifdef CONFIG_LEDS_TIMER
      case led_timer:         /* Every 50 timer ticks */
            ks8695_led_toggle(ks8695_leds_timer);
            break;
#endif

#ifdef CONFIG_LEDS_CPU
      case led_idle_start:    /* Entering idle state */
            ks8695_led_off(ks8695_leds_cpu);
            break;

      case led_idle_end:      /* Exit idle state */
            ks8695_led_on(ks8695_leds_cpu);
            break;
#endif

      default:
            break;
      }

      local_irq_restore(flags);
}


static int __init leds_init(void)
{
      if ((ks8695_leds_timer == -1) || (ks8695_leds_cpu == -1))
            return -ENODEV;

      leds_event = ks8695_leds_event;

      leds_event(led_start);
      return 0;
}

__initcall(leds_init);

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