leds-adsbitsy.c

来自「MIZI Research, Inc.发布的嵌入式Linux内核源码」· C语言 代码 · 共 97 行

/*
 *  linux/arch/arm/mach-sa1100/leds-adsbitsy.c
 *
 * ADS Bitsy LED
 * 7/25/01 Woojung Huh
 */
#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;

#define LED_TIMER       GPIO_GPIO20  /* green heartbeat */

#define LED_MASK		(LED_TIMER)

void adsbitsy_leds_event(led_event_t evt)
{
	unsigned long flags;

	save_flags_cli(flags);

	switch (evt) {
	case led_start:
		hw_led_state = 0;        /* gc leds are positive logic */
		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_TIMER;
		break;
#endif

#ifdef CONFIG_LEDS_CPU
	case led_idle_start:
		break;

	case led_idle_end:
		break;
#endif

	case led_green_on:
		break;

	case led_green_off:
		break;

	case led_amber_on:
		break;

	case led_amber_off:
		break;

	case led_red_on:
		break;

	case led_red_off:
		break;

	default:
		break;
	}

	if  (led_state & LED_STATE_ENABLED) {
		GPSR = hw_led_state;
		GPCR = hw_led_state ^ LED_MASK;
	}

	restore_flags(flags);
}