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

   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
  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_RAW_SPINLOCK(leds_lock);
  34
  35 static void netwinder_leds_event(led_event_t evt)
  36 {
  37         unsigned long flags;
  38
  39         raw_spin_lock_irqsave(&leds_lock, flags);
  40
  41         switch (evt) {
  42         case led_start:
  43                 led_state |= LED_STATE_ENABLED;
  44                 hw_led_state = GPIO_GREEN_LED;
  45                 break;
  46
  47         case led_stop:
  48                 led_state &= ~LED_STATE_ENABLED;
  49                 break;
  50
  51         case led_claim:
  52                 led_state |= LED_STATE_CLAIMED;
  53                 hw_led_state = 0;
  54                 break;
  55
  56         case led_release:
  57                 led_state &= ~LED_STATE_CLAIMED;
  58                 hw_led_state = 0;
  59                 break;
  60
  61 #ifdef CONFIG_LEDS_TIMER
  62         case led_timer:
  63                 if (!(led_state & LED_STATE_CLAIMED))
  64                         hw_led_state ^= GPIO_GREEN_LED;
  65                 break;
  66 #endif
  67
  68 #ifdef CONFIG_LEDS_CPU
  69         case led_idle_start:
  70                 if (!(led_state & LED_STATE_CLAIMED))
  71                         hw_led_state &= ~GPIO_RED_LED;
  72                 break;
  73
  74         case led_idle_end:
  75                 if (!(led_state & LED_STATE_CLAIMED))
  76                         hw_led_state |= GPIO_RED_LED;
  77                 break;
  78 #endif
  79
  80         case led_halted:
  81                 if (!(led_state & LED_STATE_CLAIMED))
  82                         hw_led_state |= GPIO_RED_LED;
  83                 break;
  84
  85         case led_green_on:
  86                 if (led_state & LED_STATE_CLAIMED)
  87                         hw_led_state |= GPIO_GREEN_LED;
  88                 break;
  89
  90         case led_green_off:
  91                 if (led_state & LED_STATE_CLAIMED)
  92                         hw_led_state &= ~GPIO_GREEN_LED;
  93                 break;
  94
  95         case led_amber_on:
  96                 if (led_state & LED_STATE_CLAIMED)
  97                         hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
  98                 break;
  99
 100         case led_amber_off:
 101                 if (led_state & LED_STATE_CLAIMED)
 102                         hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
 103                 break;
 104
 105         case led_red_on:
 106                 if (led_state & LED_STATE_CLAIMED)
 107                         hw_led_state |= GPIO_RED_LED;
 108                 break;
 109
 110         case led_red_off:
 111                 if (led_state & LED_STATE_CLAIMED)
 112                         hw_led_state &= ~GPIO_RED_LED;
 113                 break;
 114
 115         default:
 116                 break;
 117         }
 118
 119         raw_spin_unlock_irqrestore(&leds_lock, flags);
 120
 121         if  (led_state & LED_STATE_ENABLED) {
 122                 raw_spin_lock_irqsave(&nw_gpio_lock, flags);
 123                 nw_gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
 124                 raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
 125         }
 126 }
 127
 128 static int __init leds_init(void)
 129 {
 130         if (machine_is_netwinder())
 131                 leds_event = netwinder_leds_event;
 132
 133         leds_event(led_start);
 134
 135         return 0;
 136 }
 137
 138 __initcall(leds_init);