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gpio.c

/*
 * arch/arm/plat-iop/gpio.c
 * GPIO handling for Intel IOP3xx processors.
 *
 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <asm/hardware/iop3xx.h>

void gpio_line_config(int line, int direction)
{
      unsigned long flags;

      local_irq_save(flags);
      if (direction == GPIO_IN) {
            *IOP3XX_GPOE |= 1 << line;
      } else if (direction == GPIO_OUT) {
            *IOP3XX_GPOE &= ~(1 << line);
      }
      local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_line_config);

int gpio_line_get(int line)
{
      return !!(*IOP3XX_GPID & (1 << line));
}
EXPORT_SYMBOL(gpio_line_get);

void gpio_line_set(int line, int value)
{
      unsigned long flags;

      local_irq_save(flags);
      if (value == GPIO_LOW) {
            *IOP3XX_GPOD &= ~(1 << line);
      } else if (value == GPIO_HIGH) {
            *IOP3XX_GPOD |= 1 << line;
      }
      local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_line_set);

static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
      gpio_line_config(gpio, GPIO_IN);
      return 0;
}

static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
{
      gpio_line_set(gpio, level);
      gpio_line_config(gpio, GPIO_OUT);
      return 0;
}

static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
      return gpio_line_get(gpio);
}

static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
      gpio_line_set(gpio, value);
}

static struct gpio_chip iop3xx_chip = {
      .label                  = "iop3xx",
      .direction_input  = iop3xx_gpio_direction_input,
      .get              = iop3xx_gpio_get_value,
      .direction_output = iop3xx_gpio_direction_output,
      .set              = iop3xx_gpio_set_value,
      .base             = 0,
      .ngpio                  = IOP3XX_N_GPIOS,
};

static int __init iop3xx_gpio_setup(void)
{
      return gpiochip_add(&iop3xx_chip);
}
arch_initcall(iop3xx_gpio_setup);

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