kernel/linux/arch/arm/mach-sa1100/leds-brutus.c

   1 /*
   2  * linux/arch/arm/mach-sa1100/leds-brutus.c
   3  *
   4  * Copyright (C) 2000 Nicolas Pitre
   5  *
   6  * Brutus uses the LEDs as follows:
   7  *   - D3 (Green, GPIO9) - toggles state every 50 timer interrupts
   8  *   - D17 (Red, GPIO20) - on if system is not idle
   9  *   - D4 (Green, GPIO8) - misc function
  10  */
  11 #include <linux/config.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/hardware.h>
  15 #include <asm/leds.h>
  16 #include <asm/system.h>
  17
  18 #include "leds.h"
  19
  20
  21 #define LED_STATE_ENABLED       1
  22 #define LED_STATE_CLAIMED       2
  23
  24 static unsigned int led_state;
  25 static unsigned int hw_led_state;
  26
  27 #define LED_D3          GPIO_GPIO(9)
  28 #define LED_D4          GPIO_GPIO(8)
  29 #define LED_D17         GPIO_GPIO(20)
  30 #define LED_MASK        (LED_D3|LED_D4|LED_D17)
  31
  32 void brutus_leds_event(led_event_t evt)
  33 {
  34         unsigned long flags;
  35
  36         local_irq_save(flags);
  37
  38         switch (evt) {
  39         case led_start:
  40                 hw_led_state = LED_MASK;
  41                 led_state = LED_STATE_ENABLED;
  42                 break;
  43
  44         case led_stop:
  45                 led_state &= ~LED_STATE_ENABLED;
  46                 break;
  47
  48         case led_claim:
  49                 led_state |= LED_STATE_CLAIMED;
  50                 hw_led_state = LED_MASK;
  51                 break;
  52
  53         case led_release:
  54                 led_state &= ~LED_STATE_CLAIMED;
  55                 hw_led_state = LED_MASK;
  56                 break;
  57
  58 #ifdef CONFIG_LEDS_TIMER
  59         case led_timer:
  60                 if (!(led_state & LED_STATE_CLAIMED))
  61                         hw_led_state ^= LED_D3;
  62                 break;
  63 #endif
  64
  65 #ifdef CONFIG_LEDS_CPU
  66         case led_idle_start:
  67                 if (!(led_state & LED_STATE_CLAIMED))
  68                         hw_led_state |= LED_D17;
  69                 break;
  70
  71         case led_idle_end:
  72                 if (!(led_state & LED_STATE_CLAIMED))
  73                         hw_led_state &= ~LED_D17;
  74                 break;
  75 #endif
  76
  77         case led_green_on:
  78                 hw_led_state &= ~LED_D4;
  79                 break;
  80
  81         case led_green_off:
  82                 hw_led_state |= LED_D4;
  83                 break;
  84
  85         case led_amber_on:
  86                 break;
  87
  88         case led_amber_off:
  89                 break;
  90
  91         case led_red_on:
  92                 if (led_state & LED_STATE_CLAIMED)
  93                         hw_led_state &= ~LED_D17;
  94                 break;
  95
  96         case led_red_off:
  97                 if (led_state & LED_STATE_CLAIMED)
  98                         hw_led_state |= LED_D17;
  99                 break;
 100
 101         default:
 102                 break;
 103         }
 104
 105         if  (led_state & LED_STATE_ENABLED) {
 106                 GPSR = hw_led_state;
 107                 GPCR = hw_led_state ^ LED_MASK;
 108         }
 109
 110         local_irq_restore(flags);
 111 }