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