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/init.h>
  13
  14 #include <mach/hardware.h>
  15 #include <asm/leds.h>
  16
  17 #include "leds.h"
  18
  19
  20 #define LED_STATE_ENABLED       1
  21 #define LED_STATE_CLAIMED       2
  22
  23 static unsigned int led_state;
  24 static unsigned int hw_led_state;
  25
  26 #define LED_GREEN    GPIO_GPIO23
  27 #define LED_RED    GPIO_GPIO22
  28 #define LED_MASK  (LED_RED | LED_GREEN)
  29
  30 void hackkit_leds_event(led_event_t evt)
  31 {
  32         unsigned long flags;
  33
  34         local_irq_save(flags);
  35
  36         switch(evt) {
  37                 case led_start:
  38                         /* pin 22/23 are outputs */
  39                         GPDR |= LED_MASK;
  40                         hw_led_state = LED_MASK;
  41                         led_state = LED_STATE_ENABLED;
  42                         break;
  43
  44                 case led_stop:
  45                         led_state &= ~LED_STATE_ENABLED;
  46                         break;
  47
  48                 case led_claim:
  49                         led_state |= LED_STATE_CLAIMED;
  50                         hw_led_state = LED_MASK;
  51                         break;
  52
  53                 case led_release:
  54                         led_state &= ~LED_STATE_CLAIMED;
  55                         hw_led_state = LED_MASK;
  56                         break;
  57
  58 #ifdef CONFIG_LEDS_TIMER
  59                 case led_timer:
  60                         if (!(led_state & LED_STATE_CLAIMED))
  61                                 hw_led_state ^= LED_GREEN;
  62                         break;
  63 #endif
  64
  65 #ifdef CONFIG_LEDS_CPU
  66                 case led_idle_start:
  67                         /* The LART people like the LED to be off when the
  68                            system is idle... */
  69                         if (!(led_state & LED_STATE_CLAIMED))
  70                                 hw_led_state &= ~LED_RED;
  71                         break;
  72
  73                 case led_idle_end:
  74                         /* ... and on if the system is not idle */
  75                         if (!(led_state & LED_STATE_CLAIMED))
  76                                 hw_led_state |= LED_RED;
  77                         break;
  78 #endif
  79
  80                 case led_red_on:
  81                         if (led_state & LED_STATE_CLAIMED)
  82                                 hw_led_state &= ~LED_RED;
  83                         break;
  84
  85                 case led_red_off:
  86                         if (led_state & LED_STATE_CLAIMED)
  87                                 hw_led_state |= LED_RED;
  88                         break;
  89
  90                 case led_green_on:
  91                         if (led_state & LED_STATE_CLAIMED)
  92                                 hw_led_state &= ~LED_GREEN;
  93                         break;
  94
  95                 case led_green_off:
  96                         if (led_state & LED_STATE_CLAIMED)
  97                                 hw_led_state |= LED_GREEN;
  98                         break;
  99
 100                 default:
 101                         break;
 102         }
 103
 104         /* Now set the GPIO state, or nothing will happen at all */
 105         if (led_state & LED_STATE_ENABLED) {
 106                 GPSR = hw_led_state;
 107                 GPCR = hw_led_state ^ LED_MASK;
 108         }
 109
 110         local_irq_restore(flags);
 111 }