LXR linux/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
  24static unsigned int led_state;
  25static 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
  31void 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}
 113