openwrt-xburst/target/linux/danube/files/drivers/char/danube_gpio.c

/*
 *   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.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 *   Copyright (C) 2005 infineon
 *   Copyright (C) 2007 John Crispin <blogic@openwrt.org> 
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <asm/danube/danube.h>
#include <asm/danube/danube_ioctl.h>


#define DANUBE_PORT_OUT_REG				0x00000010
#define DANUBE_PORT_IN_REG				0x00000014
#define DANUBE_PORT_DIR_REG				0x00000018
#define DANUBE_PORT_ALTSEL0_REG			0x0000001C
#define DANUBE_PORT_ALTSEL1_REG			0x00000020
#define DANUBE_PORT_OD_REG				0x00000024
#define DANUBE_PORT_STOFF_REG			0x00000028
#define DANUBE_PORT_PUDSEL_REG			0x0000002C
#define DANUBE_PORT_PUDEN_REG			0x00000030

#define PORT_MODULE_ID  0xff

#define PORT_WRITE_REG(reg, value)   \
		*((volatile u32*)(reg)) = (u32)value;

#define PORT_READ_REG(reg, value)    \
		value = (u32)*((volatile u32*)(reg));

#define PORT_IOC_CALL(ret,port,pin,func)    \
		ret=danube_port_reserve_pin(port,pin,PORT_MODULE_ID); \
		if (ret == 0) ret=func(port,pin,PORT_MODULE_ID); \
		if (ret == 0) ret=danube_port_free_pin(port,pin,PORT_MODULE_ID);


#define MAX_PORTS	2	// Number of ports in system
#define PINS_PER_PORT	16	// Number of available pins per port

static int port_major = 0;
static int danube_port_pin_usage[MAX_PORTS][PINS_PER_PORT];	// Map for pin usage
static u32 danube_port_bases[MAX_PORTS]
	= { DANUBE_GPIO_BASE_ADDR, DANUBE_GPIO_P0_PUDEN };

static struct semaphore port_sem;

int
danube_port_reserve_pin (int port, int pin, int module_id)
{
	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] == 0) {
		danube_port_pin_usage[port][pin] = module_id;
	}
	else {
		return -EBUSY;
	}

	return 0;
}

int
danube_port_free_pin (int port, int pin, int module_id)
{

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;
	danube_port_pin_usage[port][pin] = 0;

	return 0;
}

int
danube_port_set_open_drain (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_OD_REG, reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_OD_REG, reg);

	return 0;
}

int
danube_port_clear_open_drain (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_OD_REG, reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_OD_REG, reg);

	return 0;
}

int
danube_port_set_pudsel (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_PUDSEL_REG, reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_PUDSEL_REG,
			reg);

	return 0;
}

int
danube_port_clear_pudsel (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_PUDSEL_REG, reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_PUDSEL_REG,
			reg);

	return 0;
}

int
danube_port_set_puden (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_PUDEN_REG, reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_PUDEN_REG, reg);

	return 0;
}

int
danube_port_clear_puden (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_PUDEN_REG, reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_PUDEN_REG, reg);

	return 0;
}

int
danube_port_set_stoff (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_STOFF_REG, reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_STOFF_REG, reg);

	return 0;
}

int
danube_port_clear_stoff (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_STOFF_REG, reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_STOFF_REG, reg);

	return 0;
}

int
danube_port_set_dir_out (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_DIR_REG, reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_DIR_REG, reg);

	return 0;
}

int
danube_port_set_dir_in (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_DIR_REG, reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_DIR_REG, reg);

	return 0;
}

int
danube_port_set_output (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_OUT_REG, reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_OUT_REG, reg);

	return 0;
}

int
danube_port_clear_output (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_OUT_REG, reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_OUT_REG, reg);

	return 0;
}

int
danube_port_get_input (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_IN_REG, reg);
	reg &= (1 << pin);
	if (reg == 0x00)
		return 0;
	else
		return 1;
}

int
danube_port_set_altsel0 (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL0_REG,
		       reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL0_REG,
			reg);

	return 0;
}

int
danube_port_clear_altsel0 (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL0_REG,
		       reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL0_REG,
			reg);

	return 0;
}

int
danube_port_set_altsel1 (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL1_REG,
		       reg);
	reg |= (1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL1_REG,
			reg);

	return 0;
}

int
danube_port_clear_altsel1 (int port, int pin, int module_id)
{
	u32 reg;

	if (port < 0 || pin < 0)
		return -EINVAL;
	if (port > MAX_PORTS || pin > PINS_PER_PORT)
		return -EINVAL;

	if (danube_port_pin_usage[port][pin] != module_id)
		return -EBUSY;

	PORT_READ_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL1_REG,
		       reg);
	reg &= ~(1 << pin);
	PORT_WRITE_REG (danube_port_bases[port] + DANUBE_PORT_ALTSEL1_REG,
			reg);

	return 0;
}

int
danube_port_read_procmem (char *buf, char **start, off_t offset, int count,
			  int *eof, void *data)
{
	long len = 0;
	int t = 0;
	u32 bit = 0;
	u32 reg = 0;

	len = sprintf (buf, "\nDanube Port Settings\n");

	len = len + sprintf (buf + len,
			     "         3         2         1         0\n");
	len = len + sprintf (buf + len,
			     "        10987654321098765432109876543210\n");
	len = len + sprintf (buf + len,
			     "----------------------------------------\n");

	len = len + sprintf (buf + len, "\nP0-OUT: ");
	PORT_READ_REG (DANUBE_GPIO_P0_OUT, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-OUT: ");
	PORT_READ_REG (DANUBE_GPIO_P1_OUT, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0-IN:  ");
	PORT_READ_REG (DANUBE_GPIO_P0_IN, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-IN:  ");
	PORT_READ_REG (DANUBE_GPIO_P1_IN, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0-DIR: ");
	PORT_READ_REG (DANUBE_GPIO_P0_DIR, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-DIR: ");
	PORT_READ_REG (DANUBE_GPIO_P1_DIR, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0-STO: ");
	PORT_READ_REG (DANUBE_GPIO_P0_STOFF, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-STO: ");
	PORT_READ_REG (DANUBE_GPIO_P1_STOFF, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0-PUDE:");
	PORT_READ_REG (DANUBE_GPIO_P0_PUDEN, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-PUDE:");
	PORT_READ_REG (DANUBE_GPIO_P1_PUDEN, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0-OD:  ");
	PORT_READ_REG (DANUBE_GPIO_P0_OD, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-OD:  ");
	PORT_READ_REG (DANUBE_GPIO_P1_OD, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0-PUDS:");
	PORT_READ_REG (DANUBE_GPIO_P0_PUDSEL, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1-PUDS:");
	PORT_READ_REG (DANUBE_GPIO_P1_PUDSEL, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0_ALT0:");
	PORT_READ_REG (DANUBE_GPIO_P0_ALTSEL0, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP0_ALT1:");
	PORT_READ_REG (DANUBE_GPIO_P0_ALTSEL1, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1_ALT0:");
	PORT_READ_REG (DANUBE_GPIO_P1_ALTSEL0, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\nP1_ALT1:");
	PORT_READ_REG (DANUBE_GPIO_P1_ALTSEL1, reg);
	bit = 0x80000000;
	for (t = 0; t < 32; t++) {
		if ((reg & bit) > 0)
			len = len + sprintf (buf + len, "X");
		else
			len = len + sprintf (buf + len, " ");
		bit = bit >> 1;
	}

	len = len + sprintf (buf + len, "\n\n");

	*eof = 1;		// No more data available
	return len;
}

static int
danube_port_open (struct inode *inode, struct file *filep)
{
	return 0;
}

static int
danube_port_release (struct inode *inode, struct file *filelp)
{
	return 0;
}

static int
danube_port_ioctl (struct inode *inode, struct file *filp,
		   unsigned int cmd, unsigned long arg)
{
	int ret = 0;
	volatile struct danube_port_ioctl_parm parm;

	if (_IOC_TYPE (cmd) != DANUBE_PORT_IOC_MAGIC)
		return -EINVAL;

	if (_IOC_DIR (cmd) & _IOC_WRITE) {
		if (!access_ok
		    (VERIFY_READ, arg,
		     sizeof (struct danube_port_ioctl_parm)))
			return -EFAULT;
		ret = copy_from_user ((void *) &parm, (void *) arg,
				      sizeof (struct danube_port_ioctl_parm));
	}
	if (_IOC_DIR (cmd) & _IOC_READ) {
		if (!access_ok
		    (VERIFY_WRITE, arg,
		     sizeof (struct danube_port_ioctl_parm)))
			return -EFAULT;
	}

	if (down_trylock (&port_sem) != 0)
		return -EBUSY;

	switch (cmd) {
	case DANUBE_PORT_IOCOD:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_open_drain);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_open_drain);
		}
		break;
	case DANUBE_PORT_IOCPUDSEL:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_pudsel);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_pudsel);
		}
		break;
	case DANUBE_PORT_IOCPUDEN:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_puden);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_puden);
		}
		break;
	case DANUBE_PORT_IOCSTOFF:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_stoff);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_stoff);
		}
		break;
	case DANUBE_PORT_IOCDIR:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_dir_in);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_dir_out);
		}
		break;
	case DANUBE_PORT_IOCOUTPUT:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_output);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_output);
		}
		break;
	case DANUBE_PORT_IOCALTSEL0:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_altsel0);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_altsel0);
		}
		break;
	case DANUBE_PORT_IOCALTSEL1:
		if (parm.value == 0x00) {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_clear_altsel1);
		}
		else {
			PORT_IOC_CALL (ret, parm.port, parm.pin,
				       danube_port_set_altsel1);
		}
		break;
	case DANUBE_PORT_IOCINPUT:
		ret = danube_port_reserve_pin (parm.port, parm.pin,
					       PORT_MODULE_ID);
		if (ret == 0)
			parm.value =
				danube_port_get_input (parm.port, parm.pin,
						       PORT_MODULE_ID);
		ret = danube_port_free_pin (parm.port, parm.pin,
					    PORT_MODULE_ID);
		copy_to_user ((void *) arg, (void *) &parm,
			      sizeof (struct danube_port_ioctl_parm));
		break;
	default:
		ret = -EINVAL;
	}

	up (&port_sem);

	return ret;
}

static struct file_operations port_fops = {
      open:danube_port_open,
      release:danube_port_release,
      ioctl:danube_port_ioctl
};

int __init
danube_port_init (void)
{
	int t = 0;
	int i = 0;
	int err = 0;
	printk ("Danube Port Initialization\n");

	sema_init (&port_sem, 1);

	/* Check ports for available pins */
	for (t = 0; t < MAX_PORTS; t++) {
		for (i = 0; i < PINS_PER_PORT; i++)
			danube_port_pin_usage[t][i] = 0;
	}

	/* register port device */
	err = register_chrdev (0, "danube-port", &port_fops);
	if (err > 0)
		port_major = err;
	else {
		printk ("danube-port: Error! Could not register port device. #%d\n", err);
		return err;
	}

	/* Create proc file */
	create_proc_read_entry ("driver/danube_port", 0, NULL,
				danube_port_read_procmem, NULL);

	return 0;
}

module_init (danube_port_init);

EXPORT_SYMBOL (danube_port_reserve_pin);
EXPORT_SYMBOL (danube_port_free_pin);
EXPORT_SYMBOL (danube_port_set_open_drain);
EXPORT_SYMBOL (danube_port_clear_open_drain);
EXPORT_SYMBOL (danube_port_set_pudsel);
EXPORT_SYMBOL (danube_port_clear_pudsel);
EXPORT_SYMBOL (danube_port_set_puden);
EXPORT_SYMBOL (danube_port_clear_puden);
EXPORT_SYMBOL (danube_port_set_stoff);
EXPORT_SYMBOL (danube_port_clear_stoff);
EXPORT_SYMBOL (danube_port_set_dir_out);
EXPORT_SYMBOL (danube_port_set_dir_in);
EXPORT_SYMBOL (danube_port_set_output);
EXPORT_SYMBOL (danube_port_clear_output);
EXPORT_SYMBOL (danube_port_get_input);

EXPORT_SYMBOL (danube_port_set_altsel0);
EXPORT_SYMBOL (danube_port_clear_altsel0);
EXPORT_SYMBOL (danube_port_set_altsel1);
EXPORT_SYMBOL (danube_port_clear_altsel1);