1/*
  2 * linux/arch/arm/mach-omap1/leds-osk.c
  3 *
  4 * LED driver for OSK with optional Mistral QVGA board
  5 */
  6#include <linux/init.h>
  7
  8#include <mach/hardware.h>
  9#include <asm/leds.h>
 10#include <asm/system.h>
 11
 12#include <mach/gpio.h>
 13
 14#include "leds.h"
 15
 16
 17#define LED_STATE_ENABLED	(1 << 0)
 18#define LED_STATE_CLAIMED	(1 << 1)
 19static u8 led_state;
 20
 21#define	TIMER_LED		(1 << 3)	/* Mistral board */
 22#define	IDLE_LED		(1 << 4)	/* Mistral board */
 23static u8 hw_led_state;
 24
 25
 26#ifdef	CONFIG_OMAP_OSK_MISTRAL
 27
 28/* For now, all system indicators require the Mistral board, since that
 29 * LED can be manipulated without a task context.  This LED is either red,
 30 * or green, but not both; it can't give the full "disco led" effect.
 31 */
 32
 33#define GPIO_LED_RED		3
 34#define GPIO_LED_GREEN		OMAP_MPUIO(4)
 35
 36static void mistral_setled(void)
 37{
 38	int	red = 0;
 39	int	green = 0;
 40
 41	if (hw_led_state & TIMER_LED)
 42		red = 1;
 43	else if (hw_led_state & IDLE_LED)
 44		green = 1;
 45	/* else both sides are disabled */
 46
 47	gpio_set_value(GPIO_LED_GREEN, green);
 48	gpio_set_value(GPIO_LED_RED, red);
 49}
 50
 51#endif
 52
 53void osk_leds_event(led_event_t evt)
 54{
 55	unsigned long	flags;
 56	u16		leds;
 57
 58	local_irq_save(flags);
 59
 60	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
 61		goto done;
 62
 63	leds = hw_led_state;
 64	switch (evt) {
 65	case led_start:
 66		led_state |= LED_STATE_ENABLED;
 67		hw_led_state = 0;
 68		leds = ~0;
 69		break;
 70
 71	case led_halted:
 72	case led_stop:
 73		led_state &= ~LED_STATE_ENABLED;
 74		hw_led_state = 0;
 75		break;
 76
 77	case led_claim:
 78		led_state |= LED_STATE_CLAIMED;
 79		hw_led_state = 0;
 80		leds = ~0;
 81		break;
 82
 83	case led_release:
 84		led_state &= ~LED_STATE_CLAIMED;
 85		hw_led_state = 0;
 86		break;
 87
 88#ifdef	CONFIG_OMAP_OSK_MISTRAL
 89
 90	case led_timer:
 91		hw_led_state ^= TIMER_LED;
 92		mistral_setled();
 93		break;
 94
 95	case led_idle_start:	/* idle == off */
 96		hw_led_state &= ~IDLE_LED;
 97		mistral_setled();
 98		break;
 99
100	case led_idle_end:
101		hw_led_state |= IDLE_LED;
102		mistral_setled();
103		break;
104
105#endif	/* CONFIG_OMAP_OSK_MISTRAL */
106
107	default:
108		break;
109	}
110
111	leds ^= hw_led_state;
112
113done:
114	local_irq_restore(flags);
115}