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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-omap1/leds-osk.c
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/*

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 * linux/arch/arm/mach-omap1/leds-osk.c

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 *

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 * LED driver for OSK with optional Mistral QVGA board

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 */

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#include <linux/init.h>

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#include <mach/hardware.h>

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#include <asm/leds.h>

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#include <asm/system.h>

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#include <mach/gpio.h>

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#include "leds.h"

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#define LED_STATE_ENABLED	(1 << 0)

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#define LED_STATE_CLAIMED	(1 << 1)

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static u8 led_state;

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#define	TIMER_LED		(1 << 3)	/* Mistral board */

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#define	IDLE_LED		(1 << 4)	/* Mistral board */

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static u8 hw_led_state;

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#ifdef	CONFIG_OMAP_OSK_MISTRAL

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/* For now, all system indicators require the Mistral board, since that

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 * LED can be manipulated without a task context.  This LED is either red,

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 * or green, but not both; it can't give the full "disco led" effect.

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 */

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#define GPIO_LED_RED		3

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#define GPIO_LED_GREEN		OMAP_MPUIO(4)

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static void mistral_setled(void)

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{

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	int	red = 0;

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	int	green = 0;

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	if (hw_led_state & TIMER_LED)

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		red = 1;

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	else if (hw_led_state & IDLE_LED)

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		green = 1;

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	/* else both sides are disabled */

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	gpio_set_value(GPIO_LED_GREEN, green);

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	gpio_set_value(GPIO_LED_RED, red);

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}

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#endif

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void osk_leds_event(led_event_t evt)

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{

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	unsigned long	flags;

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	u16		leds;

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	local_irq_save(flags);

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	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)

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		goto done;

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	leds = hw_led_state;

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	switch (evt) {

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	case led_start:

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		led_state |= LED_STATE_ENABLED;

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		hw_led_state = 0;

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		leds = ~0;

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		break;

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	case led_halted:

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	case led_stop:

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		led_state &= ~LED_STATE_ENABLED;

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		hw_led_state = 0;

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		break;

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	case led_claim:

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		led_state |= LED_STATE_CLAIMED;

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		hw_led_state = 0;

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		leds = ~0;

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		break;

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	case led_release:

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		led_state &= ~LED_STATE_CLAIMED;

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		hw_led_state = 0;

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		break;

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#ifdef	CONFIG_OMAP_OSK_MISTRAL

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	case led_timer:

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		hw_led_state ^= TIMER_LED;

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		mistral_setled();

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		break;

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	case led_idle_start:	/* idle == off */

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		hw_led_state &= ~IDLE_LED;

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		mistral_setled();

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		break;

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	case led_idle_end:

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		hw_led_state |= IDLE_LED;

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		mistral_setled();

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		break;

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#endif	/* CONFIG_OMAP_OSK_MISTRAL */

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	default:

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		break;

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	}

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	leds ^= hw_led_state;

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done:

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	local_irq_restore(flags);

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}

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