arch/arm/mach-pxa/leds-lubbock.c

   1 /*
   2  * linux/arch/arm/mach-pxa/leds-lubbock.c
   3  *
   4  * Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
   5  *
   6  * Copyright (c) 2001 Jeff Sutherland <jeffs@accelent.com>
   7  *
   8  * Original (leds-footbridge.c) by Russell King
   9  *
  10  * Major surgery on April 2004 by Nicolas Pitre for less global
  11  * namespace collision.  Mostly adapted the Mainstone version.
  12  */
  13
  14 #include <linux/init.h>
  15
  16 #include <asm/hardware.h>
  17 #include <asm/leds.h>
  18 #include <asm/system.h>
  19 #include <asm/arch/pxa-regs.h>
  20 #include <asm/arch/lubbock.h>
  21
  22 #include "leds.h"
  23
  24 /*
  25  * 8 discrete leds available for general use:
  26  *
  27  * Note: bits [15-8] are used to enable/blank the 8 7 segment hex displays
  28  * so be sure to not monkey with them here.
  29  */
  30
  31 #define D28                     (1 << 0)
  32 #define D27                     (1 << 1)
  33 #define D26                     (1 << 2)
  34 #define D25                     (1 << 3)
  35 #define D24                     (1 << 4)
  36 #define D23                     (1 << 5)
  37 #define D22                     (1 << 6)
  38 #define D21                     (1 << 7)
  39
  40 #define LED_STATE_ENABLED       1
  41 #define LED_STATE_CLAIMED       2
  42
  43 static unsigned int led_state;
  44 static unsigned int hw_led_state;
  45
  46 void lubbock_leds_event(led_event_t evt)
  47 {
  48         unsigned long flags;
  49
  50         local_irq_save(flags);
  51
  52         switch (evt) {
  53         case led_start:
  54                 hw_led_state = 0;
  55                 led_state = LED_STATE_ENABLED;
  56                 break;
  57
  58         case led_stop:
  59                 led_state &= ~LED_STATE_ENABLED;
  60                 break;
  61
  62         case led_claim:
  63                 led_state |= LED_STATE_CLAIMED;
  64                 hw_led_state = 0;
  65                 break;
  66
  67         case led_release:
  68                 led_state &= ~LED_STATE_CLAIMED;
  69                 hw_led_state = 0;
  70                 break;
  71
  72 #ifdef CONFIG_LEDS_TIMER
  73         case led_timer:
  74                 hw_led_state ^= D26;
  75                 break;
  76 #endif
  77
  78 #ifdef CONFIG_LEDS_CPU
  79         case led_idle_start:
  80                 hw_led_state &= ~D27;
  81                 break;
  82
  83         case led_idle_end:
  84                 hw_led_state |= D27;
  85                 break;
  86 #endif
  87
  88         case led_halted:
  89                 break;
  90
  91         case led_green_on:
  92                 hw_led_state |= D21;
  93                 break;
  94
  95         case led_green_off:
  96                 hw_led_state &= ~D21;
  97                 break;
  98
  99         case led_amber_on:
 100                 hw_led_state |= D22;
 101                 break;
 102
 103         case led_amber_off:
 104                 hw_led_state &= ~D22;
 105                 break;
 106
 107         case led_red_on:
 108                 hw_led_state |= D23;
 109                 break;
 110
 111         case led_red_off:
 112                 hw_led_state &= ~D23;
 113                 break;
 114
 115         default:
 116                 break;
 117         }
 118
 119         if  (led_state & LED_STATE_ENABLED)
 120                 LUB_DISC_BLNK_LED = (LUB_DISC_BLNK_LED | 0xff) & ~hw_led_state;
 121         else
 122                 LUB_DISC_BLNK_LED |= 0xff;
 123
 124         local_irq_restore(flags);
 125 }