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} 116