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