arch/arm/mach-sa1100/leds-hackkit.c

   1 /*
   2  * linux/arch/arm/mach-sa1100/leds-hackkit.c
   3  *
   4  * based on leds-lart.c
   5  *
   6  * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
   7  * (C) Stefan Eletzhofer <stefan.eletzhofer@eletztrick.de>, 2002
   8  *
   9  * The HackKit has two leds (GPIO 22/23). The red led (gpio 22) is used
  10  * as cpu led, the green one is used as timer led.
  11  */
  12 #include <linux/config.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/hardware.h>
  16 #include <asm/leds.h>
  17 #include <asm/system.h>
  18
  19 #include "leds.h"
  20
  21
  22 #define LED_STATE_ENABLED       1
  23 #define LED_STATE_CLAIMED       2
  24
  25 static unsigned int led_state;
  26 static unsigned int hw_led_state;
  27
  28 #define LED_GREEN    GPIO_GPIO23
  29 #define LED_RED    GPIO_GPIO22
  30 #define LED_MASK  (LED_RED | LED_GREEN)
  31
  32 void hackkit_leds_event(led_event_t evt)
  33 {
  34         unsigned long flags;
  35
  36         local_irq_save(flags);
  37
  38         switch(evt) {
  39                 case led_start:
  40                         /* pin 22/23 are outputs */
  41                         GPDR |= LED_MASK;
  42                         hw_led_state = LED_MASK;
  43                         led_state = LED_STATE_ENABLED;
  44                         break;
  45
  46                 case led_stop:
  47                         led_state &= ~LED_STATE_ENABLED;
  48                         break;
  49
  50                 case led_claim:
  51                         led_state |= LED_STATE_CLAIMED;
  52                         hw_led_state = LED_MASK;
  53                         break;
  54
  55                 case led_release:
  56                         led_state &= ~LED_STATE_CLAIMED;
  57                         hw_led_state = LED_MASK;
  58                         break;
  59
  60 #ifdef CONFIG_LEDS_TIMER
  61                 case led_timer:
  62                         if (!(led_state & LED_STATE_CLAIMED))
  63                                 hw_led_state ^= LED_GREEN;
  64                         break;
  65 #endif
  66
  67 #ifdef CONFIG_LEDS_CPU
  68                 case led_idle_start:
  69                         /* The LART people like the LED to be off when the
  70                            system is idle... */
  71                         if (!(led_state & LED_STATE_CLAIMED))
  72                                 hw_led_state &= ~LED_RED;
  73                         break;
  74
  75                 case led_idle_end:
  76                         /* ... and on if the system is not idle */
  77                         if (!(led_state & LED_STATE_CLAIMED))
  78                                 hw_led_state |= LED_RED;
  79                         break;
  80 #endif
  81
  82                 case led_red_on:
  83                         if (led_state & LED_STATE_CLAIMED)
  84                                 hw_led_state &= ~LED_RED;
  85                         break;
  86
  87                 case led_red_off:
  88                         if (led_state & LED_STATE_CLAIMED)
  89                                 hw_led_state |= LED_RED;
  90                         break;
  91
  92                 case led_green_on:
  93                         if (led_state & LED_STATE_CLAIMED)
  94                                 hw_led_state &= ~LED_GREEN;
  95                         break;
  96
  97                 case led_green_off:
  98                         if (led_state & LED_STATE_CLAIMED)
  99                                 hw_led_state |= LED_GREEN;
 100                         break;
 101
 102                 default:
 103                         break;
 104         }
 105
 106         /* Now set the GPIO state, or nothing will happen at all */
 107         if (led_state & LED_STATE_ENABLED) {
 108                 GPSR = hw_led_state;
 109                 GPCR = hw_led_state ^ LED_MASK;
 110         }
 111
 112         local_irq_restore(flags);
 113 }