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