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netwinder-leds.c

/*
 *  linux/arch/arm/mach-footbridge/netwinder-leds.c
 *
 *  Copyright (C) 1998-1999 Russell King
 *
 * 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.
 *
 * NetWinder LED control routines.
 *
 * The Netwinder uses the leds as follows:
 *  - Green - toggles state every 50 timer interrupts
 *  - Red   - On if the system is not idle
 *
 * Changelog:
 *   02-05-1999   RMK   Various cleanups
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>

#include <mach/hardware.h>
#include <asm/leds.h>
#include <asm/mach-types.h>
#include <asm/system.h>

#define LED_STATE_ENABLED     1
#define LED_STATE_CLAIMED     2
static char led_state;
static char hw_led_state;

static DEFINE_SPINLOCK(leds_lock);

static void netwinder_leds_event(led_event_t evt)
{
      unsigned long flags;

      spin_lock_irqsave(&leds_lock, flags);

      switch (evt) {
      case led_start:
            led_state |= LED_STATE_ENABLED;
            hw_led_state = GPIO_GREEN_LED;
            break;

      case led_stop:
            led_state &= ~LED_STATE_ENABLED;
            break;

      case led_claim:
            led_state |= LED_STATE_CLAIMED;
            hw_led_state = 0;
            break;

      case led_release:
            led_state &= ~LED_STATE_CLAIMED;
            hw_led_state = 0;
            break;

#ifdef CONFIG_LEDS_TIMER
      case led_timer:
            if (!(led_state & LED_STATE_CLAIMED))
                  hw_led_state ^= GPIO_GREEN_LED;
            break;
#endif

#ifdef CONFIG_LEDS_CPU
      case led_idle_start:
            if (!(led_state & LED_STATE_CLAIMED))
                  hw_led_state &= ~GPIO_RED_LED;
            break;

      case led_idle_end:
            if (!(led_state & LED_STATE_CLAIMED))
                  hw_led_state |= GPIO_RED_LED;
            break;
#endif

      case led_halted:
            if (!(led_state & LED_STATE_CLAIMED))
                  hw_led_state |= GPIO_RED_LED;
            break;

      case led_green_on:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state |= GPIO_GREEN_LED;
            break;

      case led_green_off:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state &= ~GPIO_GREEN_LED;
            break;

      case led_amber_on:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
            break;

      case led_amber_off:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
            break;

      case led_red_on:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state |= GPIO_RED_LED;
            break;

      case led_red_off:
            if (led_state & LED_STATE_CLAIMED)
                  hw_led_state &= ~GPIO_RED_LED;
            break;

      default:
            break;
      }

      spin_unlock_irqrestore(&leds_lock, flags);

      if  (led_state & LED_STATE_ENABLED) {
            spin_lock_irqsave(&nw_gpio_lock, flags);
            nw_gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
            spin_unlock_irqrestore(&nw_gpio_lock, flags);
      }
}

static int __init leds_init(void)
{
      if (machine_is_netwinder())
            leds_event = netwinder_leds_event;

      leds_event(led_start);

      return 0;
}

__initcall(leds_init);

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