leds-idp.c

ARM 嵌入式 系统 设计与实例开发 实验教材 二源码

/*
 * linux/arch/arm/mach-pxa/leds-idp.c
 *
 * Copyright (C) 2000 John Dorsey <[e-mail]>
 *
 * Copyright (c) 2001 Jeff Sutherland <[e-mail]>
 *
 * Original (leds-footbridge.c) by Russell King
 * 
 * Macros for actual LED manipulation should be in machine specific
 * files in this 'mach' directory.
 */


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

#include <asm/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;

void idp_leds_event(led_event_t evt)
{
	unsigned long flags;

	local_irq_save(flags);

	switch (evt) {
	case led_start:
		hw_led_state = IDP_HB_LED | IDP_BUSY_LED;
		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 = IDP_HB_LED | IDP_BUSY_LED;
		break;

	case led_release:
		led_state &= ~LED_STATE_CLAIMED;
		hw_led_state = IDP_HB_LED | IDP_BUSY_LED;
		break;

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

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

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

	case led_halted:
		break;

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

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

	case led_amber_on:
		break;

	case led_amber_off:
		break;

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

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

	default:
		break;
	}

	if  (led_state & LED_STATE_ENABLED)
		IDP_WRITE_LEDS(hw_led_state);

	local_irq_restore(flags);
}