arch/arm/mach-omap1/leds-osk.c

   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)
  19 static u8 led_state;
  20
  21 #define TIMER_LED               (1 << 3)        /* Mistral board */
  22 #define IDLE_LED                (1 << 4)        /* Mistral board */
  23 static 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
  36 static 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
  53 void 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
 113 done:
 114         local_irq_restore(flags);
 115 }