116 lines
2.0 KiB
C
116 lines
2.0 KiB
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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