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/*
* linux/arch/arm/mach-omap1/leds-osk.c
*
* LED driver for OSK, and optionally Mistral QVGA, boards
*/
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/i2c/tps65010.h>
#include <asm/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <asm/arch/gpio.h>
#include "leds.h"
#define LED_STATE_ENABLED (1 << 0)
#define LED_STATE_CLAIMED (1 << 1)
static u8 led_state;
#define GREEN_LED (1 << 0) /* TPS65010 LED1 */
#define AMBER_LED (1 << 1) /* TPS65010 LED2 */
#define RED_LED (1 << 2) /* TPS65010 GPIO2 */
#define TIMER_LED (1 << 3) /* Mistral board */
#define IDLE_LED (1 << 4) /* Mistral board */
static u8 hw_led_state;
/* TPS65010 leds are changed using i2c -- from a task context.
* Using one of these for the "idle" LED would be impractical...
*/
#define TPS_LEDS (GREEN_LED | RED_LED | AMBER_LED)
static u8 tps_leds_change;
static void tps_work(struct work_struct *unused)
{
for (;;) {
u8 leds;
local_irq_disable();
leds = tps_leds_change;
tps_leds_change = 0;
local_irq_enable();
if (!leds)
break;
/* careful: the set_led() value is on/off/blink */
if (leds & GREEN_LED)
tps65010_set_led(LED1, !!(hw_led_state & GREEN_LED));
if (leds & AMBER_LED)
tps65010_set_led(LED2, !!(hw_led_state & AMBER_LED));
/* the gpio led doesn't have that issue */
if (leds & RED_LED)
tps65010_set_gpio_out_value(GPIO2,
!(hw_led_state & RED_LED));
}
}
static DECLARE_WORK(work, tps_work);
#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;
// NOTE: work may still be pending!!
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 */
/* "green" == tps LED1 (leftmost, normally power-good)
* works only with DC adapter, not on battery power!
*/
case led_green_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= GREEN_LED;
break;
case led_green_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~GREEN_LED;
break;
/* "amber" == tps LED2 (middle) */
case led_amber_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= AMBER_LED;
break;
case led_amber_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~AMBER_LED;
break;
/* "red" == LED on tps gpio3 (rightmost) */
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= RED_LED;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~RED_LED;
break;
default:
break;
}
leds ^= hw_led_state;
leds &= TPS_LEDS;
if (leds && (led_state & LED_STATE_CLAIMED)) {
tps_leds_change |= leds;
schedule_work(&work);
}
done:
local_irq_restore(flags);
}
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