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  * NetWinder LED control routines.
   7  *
   8  * The Netwinder uses the leds as follows:
   9  *  - Green - toggles state every 50 timer interrupts
  10  *  - Red   - On if the system is not idle
  11  *
  12  * Changelog:
  13  *   02-05-1999 RMK     Various cleanups
  14  */
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/spinlock.h>
  19
  20 #include <asm/hardware.h>
  21 #include <asm/leds.h>
  22 #include <asm/mach-types.h>
  23 #include <asm/system.h>
  24
  25 #define LED_STATE_ENABLED       1
  26 #define LED_STATE_CLAIMED       2
  27 static char led_state;
  28 static char hw_led_state;
  29
  30 static spinlock_t leds_lock = SPIN_LOCK_UNLOCKED;
  31 extern spinlock_t gpio_lock;
  32
  33 static void netwinder_leds_event(led_event_t evt)
  34 {
  35         unsigned long flags;
  36
  37         spin_lock_irqsave(&leds_lock, flags);
  38
  39         switch (evt) {
  40         case led_start:
  41                 led_state |= LED_STATE_ENABLED;
  42                 hw_led_state = GPIO_GREEN_LED;
  43                 break;
  44
  45         case led_stop:
  46                 led_state &= ~LED_STATE_ENABLED;
  47                 break;
  48
  49         case led_claim:
  50                 led_state |= LED_STATE_CLAIMED;
  51                 hw_led_state = 0;
  52                 break;
  53
  54         case led_release:
  55                 led_state &= ~LED_STATE_CLAIMED;
  56                 hw_led_state = 0;
  57                 break;
  58
  59 #ifdef CONFIG_LEDS_TIMER
  60         case led_timer:
  61                 if (!(led_state & LED_STATE_CLAIMED))
  62                         hw_led_state ^= GPIO_GREEN_LED;
  63                 break;
  64 #endif
  65
  66 #ifdef CONFIG_LEDS_CPU
  67         case led_idle_start:
  68                 if (!(led_state & LED_STATE_CLAIMED))
  69                         hw_led_state &= ~GPIO_RED_LED;
  70                 break;
  71
  72         case led_idle_end:
  73                 if (!(led_state & LED_STATE_CLAIMED))
  74                         hw_led_state |= GPIO_RED_LED;
  75                 break;
  76 #endif
  77
  78         case led_halted:
  79                 if (!(led_state & LED_STATE_CLAIMED))
  80                         hw_led_state |= GPIO_RED_LED;
  81                 break;
  82
  83         case led_green_on:
  84                 if (led_state & LED_STATE_CLAIMED)
  85                         hw_led_state |= GPIO_GREEN_LED;
  86                 break;
  87
  88         case led_green_off:
  89                 if (led_state & LED_STATE_CLAIMED)
  90                         hw_led_state &= ~GPIO_GREEN_LED;
  91                 break;
  92
  93         case led_amber_on:
  94                 if (led_state & LED_STATE_CLAIMED)
  95                         hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
  96                 break;
  97
  98         case led_amber_off:
  99                 if (led_state & LED_STATE_CLAIMED)
 100                         hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
 101                 break;
 102
 103         case led_red_on:
 104                 if (led_state & LED_STATE_CLAIMED)
 105                         hw_led_state |= GPIO_RED_LED;
 106                 break;
 107
 108         case led_red_off:
 109                 if (led_state & LED_STATE_CLAIMED)
 110                         hw_led_state &= ~GPIO_RED_LED;
 111                 break;
 112
 113         default:
 114                 break;
 115         }
 116
 117         spin_unlock_irqrestore(&leds_lock, flags);
 118
 119         if  (led_state & LED_STATE_ENABLED) {
 120                 spin_lock_irqsave(&gpio_lock, flags);
 121                 gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
 122                 spin_unlock_irqrestore(&gpio_lock, flags);
 123         }
 124 }
 125
 126 static int __init leds_init(void)
 127 {
 128         if (machine_is_netwinder())
 129                 leds_event = netwinder_leds_event;
 130
 131         leds_event(led_start);
 132
 133         return 0;
 134 }
 135
 136 __initcall(leds_init);