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   1 /*
   2  *  linux/arch/arm/mach-footbridge/netwinder-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  *
  10  * NetWinder LED control routines.
  11  *
  12  * The Netwinder uses the leds as follows:
  13  *  - Green - toggles state every 50 timer interrupts
  14  *  - Red   - On if the system is not idle
  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 #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 extern spinlock_t gpio_lock;
  36
  37 static void netwinder_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                 led_state |= LED_STATE_ENABLED;
  46                 hw_led_state = GPIO_GREEN_LED;
  47                 break;
  48
  49         case led_stop:
  50                 led_state &= ~LED_STATE_ENABLED;
  51                 break;
  52
  53         case led_claim:
  54                 led_state |= LED_STATE_CLAIMED;
  55                 hw_led_state = 0;
  56                 break;
  57
  58         case led_release:
  59                 led_state &= ~LED_STATE_CLAIMED;
  60                 hw_led_state = 0;
  61                 break;
  62
  63 #ifdef CONFIG_LEDS_TIMER
  64         case led_timer:
  65                 if (!(led_state & LED_STATE_CLAIMED))
  66                         hw_led_state ^= GPIO_GREEN_LED;
  67                 break;
  68 #endif
  69
  70 #ifdef CONFIG_LEDS_CPU
  71         case led_idle_start:
  72                 if (!(led_state & LED_STATE_CLAIMED))
  73                         hw_led_state &= ~GPIO_RED_LED;
  74                 break;
  75
  76         case led_idle_end:
  77                 if (!(led_state & LED_STATE_CLAIMED))
  78                         hw_led_state |= GPIO_RED_LED;
  79                 break;
  80 #endif
  81
  82         case led_halted:
  83                 if (!(led_state & LED_STATE_CLAIMED))
  84                         hw_led_state |= GPIO_RED_LED;
  85                 break;
  86
  87         case led_green_on:
  88                 if (led_state & LED_STATE_CLAIMED)
  89                         hw_led_state |= GPIO_GREEN_LED;
  90                 break;
  91
  92         case led_green_off:
  93                 if (led_state & LED_STATE_CLAIMED)
  94                         hw_led_state &= ~GPIO_GREEN_LED;
  95                 break;
  96
  97         case led_amber_on:
  98                 if (led_state & LED_STATE_CLAIMED)
  99                         hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
 100                 break;
 101
 102         case led_amber_off:
 103                 if (led_state & LED_STATE_CLAIMED)
 104                         hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
 105                 break;
 106
 107         case led_red_on:
 108                 if (led_state & LED_STATE_CLAIMED)
 109                         hw_led_state |= GPIO_RED_LED;
 110                 break;
 111
 112         case led_red_off:
 113                 if (led_state & LED_STATE_CLAIMED)
 114                         hw_led_state &= ~GPIO_RED_LED;
 115                 break;
 116
 117         default:
 118                 break;
 119         }
 120
 121         spin_unlock_irqrestore(&leds_lock, flags);
 122
 123         if  (led_state & LED_STATE_ENABLED) {
 124                 spin_lock_irqsave(&gpio_lock, flags);
 125                 gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
 126                 spin_unlock_irqrestore(&gpio_lock, flags);
 127         }
 128 }
 129
 130 static int __init leds_init(void)
 131 {
 132         if (machine_is_netwinder())
 133                 leds_event = netwinder_leds_event;
 134
 135         leds_event(led_start);
 136
 137         return 0;
 138 }
 139
 140 __initcall(leds_init);