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/*
* linux/arch/arm/mach-omap1/leds-osk.c
*
* LED driver for OSK with optional Mistral QVGA board
*/
#include <linux/init.h>
#include <mach/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <mach/gpio.h>
#include "leds.h"
#define LED_STATE_ENABLED (1 << 0)
#define LED_STATE_CLAIMED (1 << 1)
static u8 led_state;
#define TIMER_LED (1 << 3) /* Mistral board */
#define IDLE_LED (1 << 4) /* Mistral board */
static u8 hw_led_state;
#ifdef CONFIG_OMAP_OSK_MISTRAL
/* For now, all system indicators require the Mistral board, since that
* LED can be manipulated without a task context. This LED is either red,
* or green, but not both; it can't give the full "disco led" effect.
*/
#define GPIO_LED_RED 3
#define GPIO_LED_GREEN OMAP_MPUIO(4)
static void mistral_setled(void)
{
int red = 0;
int green = 0;
if (hw_led_state & TIMER_LED)
red = 1;
else if (hw_led_state & IDLE_LED)
green = 1;
/* else both sides are disabled */
omap_set_gpio_dataout(GPIO_LED_GREEN, green);
omap_set_gpio_dataout(GPIO_LED_RED, red);
}
#endif
void osk_leds_event(led_event_t evt)
{
unsigned long flags;
u16 leds;
local_irq_save(flags);
if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
goto done;
leds = hw_led_state;
switch (evt) {
case led_start:
led_state |= LED_STATE_ENABLED;
hw_led_state = 0;
leds = ~0;
break;
case led_halted:
case led_stop:
led_state &= ~LED_STATE_ENABLED;
hw_led_state = 0;
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = 0;
leds = ~0;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = 0;
break;
#ifdef CONFIG_OMAP_OSK_MISTRAL
case led_timer:
hw_led_state ^= TIMER_LED;
mistral_setled();
break;
case led_idle_start: /* idle == off */
hw_led_state &= ~IDLE_LED;
mistral_setled();
break;
case led_idle_end:
hw_led_state |= IDLE_LED;
mistral_setled();
break;
#endif /* CONFIG_OMAP_OSK_MISTRAL */
default:
break;
}
leds ^= hw_led_state;
done:
local_irq_restore(flags);
}
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