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 #include <asm/system.h>
  17
  18 #include "leds.h"
  19
  20
  21 #define LED_STATE_ENABLED       1
  22 #define LED_STATE_CLAIMED       2
  23
  24 static unsigned int led_state;
  25 static unsigned int hw_led_state;
  26
  27 #define LED_GREEN    GPIO_GPIO23
  28 #define LED_RED    GPIO_GPIO22
  29 #define LED_MASK  (LED_RED | LED_GREEN)
  30
  31 void hackkit_leds_event(led_event_t evt)
  32 {
  33         unsigned long flags;
  34
  35         local_irq_save(flags);
  36
  37         switch(evt) {
  38                 case led_start:
  39                         /* pin 22/23 are outputs */
  40                         GPDR |= LED_MASK;
  41                         hw_led_state = LED_MASK;
  42                         led_state = LED_STATE_ENABLED;
  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 = LED_MASK;
  52                         break;
  53
  54                 case led_release:
  55                         led_state &= ~LED_STATE_CLAIMED;
  56                         hw_led_state = LED_MASK;
  57                         break;
  58
  59 #ifdef CONFIG_LEDS_TIMER
  60                 case led_timer:
  61                         if (!(led_state & LED_STATE_CLAIMED))
  62                                 hw_led_state ^= LED_GREEN;
  63                         break;
  64 #endif
  65
  66 #ifdef CONFIG_LEDS_CPU
  67                 case led_idle_start:
  68                         /* The LART people like the LED to be off when the
  69                            system is idle... */
  70                         if (!(led_state & LED_STATE_CLAIMED))
  71                                 hw_led_state &= ~LED_RED;
  72                         break;
  73
  74                 case led_idle_end:
  75                         /* ... and on if the system is not idle */
  76                         if (!(led_state & LED_STATE_CLAIMED))
  77                                 hw_led_state |= LED_RED;
  78                         break;
  79 #endif
  80
  81                 case led_red_on:
  82                         if (led_state & LED_STATE_CLAIMED)
  83                                 hw_led_state &= ~LED_RED;
  84                         break;
  85
  86                 case led_red_off:
  87                         if (led_state & LED_STATE_CLAIMED)
  88                                 hw_led_state |= LED_RED;
  89                         break;
  90
  91                 case led_green_on:
  92                         if (led_state & LED_STATE_CLAIMED)
  93                                 hw_led_state &= ~LED_GREEN;
  94                         break;
  95
  96                 case led_green_off:
  97                         if (led_state & LED_STATE_CLAIMED)
  98                                 hw_led_state |= LED_GREEN;
  99                         break;
 100
 101                 default:
 102                         break;
 103         }
 104
 105         /* Now set the GPIO state, or nothing will happen at all */
 106         if (led_state & LED_STATE_ENABLED) {
 107                 GPSR = hw_led_state;
 108                 GPCR = hw_led_state ^ LED_MASK;
 109         }
 110
 111         local_irq_restore(flags);
 112 }