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/config.h>
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/spinlock.h>
  24
  25 #include <asm/hardware.h>
  26 #include <asm/leds.h>
  27 #include <asm/mach-types.h>
  28 #include <asm/system.h>
  29
  30 #define LED_STATE_ENABLED       1
  31 #define LED_STATE_CLAIMED       2
  32 static char led_state;
  33 static char hw_led_state;
  34
  35 static DEFINE_SPINLOCK(leds_lock);
  36
  37 static void ebsa285_leds_event(led_event_t evt)
  38 {
  39         unsigned long flags;
  40
  41         spin_lock_irqsave(&leds_lock, flags);
  42
  43         switch (evt) {
  44         case led_start:
  45                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
  46 #ifndef CONFIG_LEDS_CPU
  47                 hw_led_state |= XBUS_LED_AMBER;
  48 #endif
  49                 led_state |= LED_STATE_ENABLED;
  50                 break;
  51
  52         case led_stop:
  53                 led_state &= ~LED_STATE_ENABLED;
  54                 break;
  55
  56         case led_claim:
  57                 led_state |= LED_STATE_CLAIMED;
  58                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  59                 break;
  60
  61         case led_release:
  62                 led_state &= ~LED_STATE_CLAIMED;
  63                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
  64                 break;
  65
  66 #ifdef CONFIG_LEDS_TIMER
  67         case led_timer:
  68                 if (!(led_state & LED_STATE_CLAIMED))
  69                         hw_led_state ^= XBUS_LED_GREEN;
  70                 break;
  71 #endif
  72
  73 #ifdef CONFIG_LEDS_CPU
  74         case led_idle_start:
  75                 if (!(led_state & LED_STATE_CLAIMED))
  76                         hw_led_state |= XBUS_LED_AMBER;
  77                 break;
  78
  79         case led_idle_end:
  80                 if (!(led_state & LED_STATE_CLAIMED))
  81                         hw_led_state &= ~XBUS_LED_AMBER;
  82                 break;
  83 #endif
  84
  85         case led_halted:
  86                 if (!(led_state & LED_STATE_CLAIMED))
  87                         hw_led_state &= ~XBUS_LED_RED;
  88                 break;
  89
  90         case led_green_on:
  91                 if (led_state & LED_STATE_CLAIMED)
  92                         hw_led_state &= ~XBUS_LED_GREEN;
  93                 break;
  94
  95         case led_green_off:
  96                 if (led_state & LED_STATE_CLAIMED)
  97                         hw_led_state |= XBUS_LED_GREEN;
  98                 break;
  99
 100         case led_amber_on:
 101                 if (led_state & LED_STATE_CLAIMED)
 102                         hw_led_state &= ~XBUS_LED_AMBER;
 103                 break;
 104
 105         case led_amber_off:
 106                 if (led_state & LED_STATE_CLAIMED)
 107                         hw_led_state |= XBUS_LED_AMBER;
 108                 break;
 109
 110         case led_red_on:
 111                 if (led_state & LED_STATE_CLAIMED)
 112                         hw_led_state &= ~XBUS_LED_RED;
 113                 break;
 114
 115         case led_red_off:
 116                 if (led_state & LED_STATE_CLAIMED)
 117                         hw_led_state |= XBUS_LED_RED;
 118                 break;
 119
 120         default:
 121                 break;
 122         }
 123
 124         if  (led_state & LED_STATE_ENABLED)
 125                 *XBUS_LEDS = hw_led_state;
 126
 127         spin_unlock_irqrestore(&leds_lock, flags);
 128 }
 129
 130 static int __init leds_init(void)
 131 {
 132         if (machine_is_ebsa285() || machine_is_co285())
 133                 leds_event = ebsa285_leds_event;
 134
 135         leds_event(led_start);
 136
 137         return 0;
 138 }
 139
 140 __initcall(leds_init);