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 <asm/hardware.h>
  25 #include <asm/leds.h>
  26 #include <asm/mach-types.h>
  27 #include <asm/system.h>
  28
  29 #define LED_STATE_ENABLED       1
  30 #define LED_STATE_CLAIMED       2
  31 static char led_state;
  32 static char hw_led_state;
  33
  34 static DEFINE_SPINLOCK(leds_lock);
  35
  36 static void ebsa285_leds_event(led_event_t evt)
  37 {
  38         unsigned long flags;
  39
  40         spin_lock_irqsave(&leds_lock, flags);
  41
  42         switch (evt) {
  43         case led_start:
  44                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
  45 #ifndef CONFIG_LEDS_CPU
  46                 hw_led_state |= XBUS_LED_AMBER;
  47 #endif
  48                 led_state |= LED_STATE_ENABLED;
  49                 break;
  50
  51         case led_stop:
  52                 led_state &= ~LED_STATE_ENABLED;
  53                 break;
  54
  55         case led_claim:
  56                 led_state |= LED_STATE_CLAIMED;
  57                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  58                 break;
  59
  60         case led_release:
  61                 led_state &= ~LED_STATE_CLAIMED;
  62                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  63                 break;
  64
  65 #ifdef CONFIG_LEDS_TIMER
  66         case led_timer:
  67                 if (!(led_state & LED_STATE_CLAIMED))
  68                         hw_led_state ^= XBUS_LED_GREEN;
  69                 break;
  70 #endif
  71
  72 #ifdef CONFIG_LEDS_CPU
  73         case led_idle_start:
  74                 if (!(led_state & LED_STATE_CLAIMED))
  75                         hw_led_state |= XBUS_LED_AMBER;
  76                 break;
  77
  78         case led_idle_end:
  79                 if (!(led_state & LED_STATE_CLAIMED))
  80                         hw_led_state &= ~XBUS_LED_AMBER;
  81                 break;
  82 #endif
  83
  84         case led_halted:
  85                 if (!(led_state & LED_STATE_CLAIMED))
  86                         hw_led_state &= ~XBUS_LED_RED;
  87                 break;
  88
  89         case led_green_on:
  90                 if (led_state & LED_STATE_CLAIMED)
  91                         hw_led_state &= ~XBUS_LED_GREEN;
  92                 break;
  93
  94         case led_green_off:
  95                 if (led_state & LED_STATE_CLAIMED)
  96                         hw_led_state |= XBUS_LED_GREEN;
  97                 break;
  98
  99         case led_amber_on:
 100                 if (led_state & LED_STATE_CLAIMED)
 101                         hw_led_state &= ~XBUS_LED_AMBER;
 102                 break;
 103
 104         case led_amber_off:
 105                 if (led_state & LED_STATE_CLAIMED)
 106                         hw_led_state |= XBUS_LED_AMBER;
 107                 break;
 108
 109         case led_red_on:
 110                 if (led_state & LED_STATE_CLAIMED)
 111                         hw_led_state &= ~XBUS_LED_RED;
 112                 break;
 113
 114         case led_red_off:
 115                 if (led_state & LED_STATE_CLAIMED)
 116                         hw_led_state |= XBUS_LED_RED;
 117                 break;
 118
 119         default:
 120                 break;
 121         }
 122
 123         if  (led_state & LED_STATE_ENABLED)
 124                 *XBUS_LEDS = hw_led_state;
 125
 126         spin_unlock_irqrestore(&leds_lock, flags);
 127 }
 128
 129 static int __init leds_init(void)
 130 {
 131         if (machine_is_ebsa285())
 132                 leds_event = ebsa285_leds_event;
 133
 134         leds_event(led_start);
 135
 136         return 0;
 137 }
 138
 139 __initcall(leds_init);