arch/arm/mach-footbridge/ebsa285-leds.c

   1 /*
   2  *  linux/arch/arm/mach-footbridge/ebsa285-leds.c
   3  *
   4  *  Copyright (C) 1998-1999 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  * EBSA-285 control routines.
  10  *
  11  * The EBSA-285 uses the leds as follows:
  12  *  - Green - toggles state every 50 timer interrupts
  13  *  - Amber - On if system is not idle
  14  *  - Red   - currently unused
  15  *
  16  * Changelog:
  17  *   02-05-1999 RMK     Various cleanups
  18  */
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/spinlock.h>
  23
  24 #include <mach/hardware.h>
  25 #include <asm/leds.h>
  26 #include <asm/mach-types.h>
  27
  28 #define LED_STATE_ENABLED       1
  29 #define LED_STATE_CLAIMED       2
  30 static char led_state;
  31 static char hw_led_state;
  32
  33 static DEFINE_SPINLOCK(leds_lock);
  34
  35 static void ebsa285_leds_event(led_event_t evt)
  36 {
  37         unsigned long flags;
  38
  39         spin_lock_irqsave(&leds_lock, flags);
  40
  41         switch (evt) {
  42         case led_start:
  43                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
  44 #ifndef CONFIG_LEDS_CPU
  45                 hw_led_state |= XBUS_LED_AMBER;
  46 #endif
  47                 led_state |= LED_STATE_ENABLED;
  48                 break;
  49
  50         case led_stop:
  51                 led_state &= ~LED_STATE_ENABLED;
  52                 break;
  53
  54         case led_claim:
  55                 led_state |= LED_STATE_CLAIMED;
  56                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  57                 break;
  58
  59         case led_release:
  60                 led_state &= ~LED_STATE_CLAIMED;
  61                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  62                 break;
  63
  64 #ifdef CONFIG_LEDS_TIMER
  65         case led_timer:
  66                 if (!(led_state & LED_STATE_CLAIMED))
  67                         hw_led_state ^= XBUS_LED_GREEN;
  68                 break;
  69 #endif
  70
  71 #ifdef CONFIG_LEDS_CPU
  72         case led_idle_start:
  73                 if (!(led_state & LED_STATE_CLAIMED))
  74                         hw_led_state |= XBUS_LED_AMBER;
  75                 break;
  76
  77         case led_idle_end:
  78                 if (!(led_state & LED_STATE_CLAIMED))
  79                         hw_led_state &= ~XBUS_LED_AMBER;
  80                 break;
  81 #endif
  82
  83         case led_halted:
  84                 if (!(led_state & LED_STATE_CLAIMED))
  85                         hw_led_state &= ~XBUS_LED_RED;
  86                 break;
  87
  88         case led_green_on:
  89                 if (led_state & LED_STATE_CLAIMED)
  90                         hw_led_state &= ~XBUS_LED_GREEN;
  91                 break;
  92
  93         case led_green_off:
  94                 if (led_state & LED_STATE_CLAIMED)
  95                         hw_led_state |= XBUS_LED_GREEN;
  96                 break;
  97
  98         case led_amber_on:
  99                 if (led_state & LED_STATE_CLAIMED)
 100                         hw_led_state &= ~XBUS_LED_AMBER;
 101                 break;
 102
 103         case led_amber_off:
 104                 if (led_state & LED_STATE_CLAIMED)
 105                         hw_led_state |= XBUS_LED_AMBER;
 106                 break;
 107
 108         case led_red_on:
 109                 if (led_state & LED_STATE_CLAIMED)
 110                         hw_led_state &= ~XBUS_LED_RED;
 111                 break;
 112
 113         case led_red_off:
 114                 if (led_state & LED_STATE_CLAIMED)
 115                         hw_led_state |= XBUS_LED_RED;
 116                 break;
 117
 118         default:
 119                 break;
 120         }
 121
 122         if  (led_state & LED_STATE_ENABLED)
 123                 *XBUS_LEDS = hw_led_state;
 124
 125         spin_unlock_irqrestore(&leds_lock, flags);
 126 }
 127
 128 static int __init leds_init(void)
 129 {
 130         if (machine_is_ebsa285())
 131                 leds_event = ebsa285_leds_event;
 132
 133         leds_event(led_start);
 134
 135         return 0;
 136 }
 137
 138 __initcall(leds_init);