drivers/staging/meilhaus/me1000_dio.c - kernel/windcharger - Git at Google

 /**
  * @file me1000_dio.c
  *
  * @brief ME-1000 DIO subdevice instance.
  * @note Copyright (C) 2006 Meilhaus Electronic GmbH (support@meilhaus.de)
  * @author Guenter Gebhardt
  * @author Krzysztof Gantzke	(k.gantzke@meilhaus.de)
  */

 /*
  * Copyright (C) 2006 Meilhaus Electronic GmbH (support@meilhaus.de)
  *
  * This file 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #ifndef __KERNEL__
 #  define __KERNEL__
 #endif

 /*
  * Includes
  */
 #include <linux/module.h>

 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/types.h>

 #include "medefines.h"
 #include "meinternal.h"
 #include "meerror.h"
 #include "medebug.h"

 #include "me1000_dio_reg.h"
 #include "me1000_dio.h"

 /*
  * Defines
  */
 #define ME1000_DIO_MAGIC_NUMBER	0x1000	/**< The magic number of the class structure. */

 /*
  * Functions
  */

 static int me1000_dio_io_reset_subdevice(struct me_subdevice *subdevice,
 					 struct file *filep, int flags)
 {
 	me1000_dio_subdevice_t *instance;
 	uint32_t tmp;

 	PDEBUG("executed.\n");

 	instance = (me1000_dio_subdevice_t *) subdevice;

 	if (flags) {
 		PERROR("Invalid flag specified.\n");
 		return ME_ERRNO_INVALID_FLAGS;
 	}

 	ME_SUBDEVICE_ENTER;

 	spin_lock(&instance->subdevice_lock);
 	spin_lock(instance->ctrl_reg_lock);
 	tmp = inl(instance->ctrl_reg);
 	tmp &= ~(0x1 << instance->dio_idx);
 	outl(tmp, instance->ctrl_reg);
 	PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 		   instance->ctrl_reg - instance->reg_base, tmp);
 	spin_unlock(instance->ctrl_reg_lock);

 	outl(0x00000000, instance->port_reg);
 	PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 		   instance->ctrl_reg - instance->reg_base, 0);
 	spin_unlock(&instance->subdevice_lock);

 	ME_SUBDEVICE_EXIT;

 	return ME_ERRNO_SUCCESS;
 }

 static int me1000_dio_io_single_config(struct me_subdevice *subdevice,
 				       struct file *filep,
 				       int channel,
 				       int single_config,
 				       int ref,
 				       int trig_chan,
 				       int trig_type, int trig_edge, int flags)
 {
 	me1000_dio_subdevice_t *instance;
 	int err = ME_ERRNO_SUCCESS;
 	int ctrl;
 	int size =
 	    flags & (ME_IO_SINGLE_CONFIG_DIO_BIT | ME_IO_SINGLE_CONFIG_DIO_BYTE
 		     | ME_IO_SINGLE_CONFIG_DIO_WORD |
 		     ME_IO_SINGLE_CONFIG_DIO_DWORD);

 	PDEBUG("executed.\n");

 	instance = (me1000_dio_subdevice_t *) subdevice;

 	ME_SUBDEVICE_ENTER;

 	spin_lock(&instance->subdevice_lock);
 	spin_lock(instance->ctrl_reg_lock);
 	ctrl = inl(instance->ctrl_reg);

 	switch (size) {
 	case ME_IO_SINGLE_CONFIG_NO_FLAGS:
 	case ME_IO_SINGLE_CONFIG_DIO_DWORD:
 		if (channel == 0) {
 			if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
 				ctrl &= ~(0x1 << instance->dio_idx);
 			} else if (single_config == ME_SINGLE_CONFIG_DIO_OUTPUT) {
 				ctrl |= 0x1 << instance->dio_idx;
 			} else {
 				PERROR("Invalid port direction.\n");
 				err = ME_ERRNO_INVALID_SINGLE_CONFIG;
 			}
 		} else {
 			PERROR("Invalid channel number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	default:
 		PERROR("Invalid flags.\n");
 		err = ME_ERRNO_INVALID_FLAGS;
 	}

 	if (!err) {
 		outl(ctrl, instance->ctrl_reg);
 		PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
 			   instance->reg_base,
 			   instance->ctrl_reg - instance->reg_base, ctrl);
 	}
 	spin_unlock(instance->ctrl_reg_lock);
 	spin_unlock(&instance->subdevice_lock);

 	ME_SUBDEVICE_EXIT;

 	return err;
 }

 static int me1000_dio_io_single_read(struct me_subdevice *subdevice,
 				     struct file *filep,
 				     int channel,
 				     int *value, int time_out, int flags)
 {
 	me1000_dio_subdevice_t *instance;
 	int err = ME_ERRNO_SUCCESS;

 	PDEBUG("executed.\n");

 	instance = (me1000_dio_subdevice_t *) subdevice;

 	ME_SUBDEVICE_ENTER;

 	spin_lock(&instance->subdevice_lock);
 	switch (flags) {
 	case ME_IO_SINGLE_TYPE_DIO_BIT:
 		if ((channel >= 0) && (channel < 32)) {
 			*value = inl(instance->port_reg) & (0x1 << channel);
 		} else {
 			PERROR("Invalid bit number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	case ME_IO_SINGLE_TYPE_DIO_BYTE:
 		if ((channel >= 0) && (channel < 4)) {
 			*value =
 			    (inl(instance->port_reg) >> (channel * 8)) & 0xFF;
 		} else {
 			PERROR("Invalid byte number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	case ME_IO_SINGLE_TYPE_DIO_WORD:
 		if ((channel >= 0) && (channel < 2)) {
 			*value =
 			    (inl(instance->port_reg) >> (channel * 16)) &
 			    0xFFFF;
 		} else {
 			PERROR("Invalid word number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	case ME_IO_SINGLE_NO_FLAGS:
 	case ME_IO_SINGLE_TYPE_DIO_DWORD:
 		if (channel == 0) {
 			*value = inl(instance->port_reg);
 		} else {
 			PERROR("Invalid dword number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	default:
 		PERROR("Invalid flags specified.\n");
 		err = ME_ERRNO_INVALID_FLAGS;
 	}
 	spin_unlock(&instance->subdevice_lock);

 	ME_SUBDEVICE_EXIT;

 	return err;
 }

 static int me1000_dio_io_single_write(struct me_subdevice *subdevice,
 				      struct file *filep,
 				      int channel,
 				      int value, int time_out, int flags)
 {
 	me1000_dio_subdevice_t *instance;
 	int err = ME_ERRNO_SUCCESS;
 	uint32_t config;
 	uint32_t state;

 	PDEBUG("executed.\n");

 	instance = (me1000_dio_subdevice_t *) subdevice;

 	ME_SUBDEVICE_ENTER spin_lock(&instance->subdevice_lock);
 	spin_lock(instance->ctrl_reg_lock);
 	config = inl(instance->ctrl_reg) & (0x1 << instance->dio_idx);
 	switch (flags) {
 	case ME_IO_SINGLE_TYPE_DIO_BIT:
 		if ((channel >= 0) && (channel < 32)) {
 			if (config) {
 				state = inl(instance->port_reg);
 				state =
 				    value ? (state | (0x1 << channel)) : (state
 									  &
 									  ~(0x1
 									    <<
 									    channel));
 				outl(state, instance->port_reg);
 				PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
 					   instance->reg_base,
 					   instance->port_reg -
 					   instance->reg_base, state);
 			} else {
 				PERROR("Port is not in output mode.\n");
 				err = ME_ERRNO_PREVIOUS_CONFIG;
 			}
 		} else {
 			PERROR("Invalid bit number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	case ME_IO_SINGLE_TYPE_DIO_BYTE:
 		if ((channel >= 0) && (channel < 4)) {
 			if (config) {
 				state = inl(instance->port_reg);
 				state &= ~(0xFF << (channel * 8));
 				state |= (value & 0xFF) << (channel * 8);
 				outl(state, instance->port_reg);
 				PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
 					   instance->reg_base,
 					   instance->port_reg -
 					   instance->reg_base, state);
 			} else {
 				PERROR("Port is not in output mode.\n");
 				err = ME_ERRNO_PREVIOUS_CONFIG;
 			}
 		} else {
 			PERROR("Invalid byte number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	case ME_IO_SINGLE_TYPE_DIO_WORD:
 		if ((channel >= 0) && (channel < 2)) {
 			if (config) {
 				state = inl(instance->port_reg);
 				state &= ~(0xFFFF << (channel * 16));
 				state |= (value & 0xFFFF) << (channel * 16);
 				outl(state, instance->port_reg);
 				PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
 					   instance->reg_base,
 					   instance->port_reg -
 					   instance->reg_base, state);
 			} else {
 				PERROR("Port is not in output mode.\n");
 				err = ME_ERRNO_PREVIOUS_CONFIG;
 			}
 		} else {
 			PERROR("Invalid word number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	case ME_IO_SINGLE_NO_FLAGS:
 	case ME_IO_SINGLE_TYPE_DIO_DWORD:
 		if (channel == 0) {
 			if (config) {
 				outl(value, instance->port_reg);
 				PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
 					   instance->reg_base,
 					   instance->port_reg -
 					   instance->reg_base, value);
 			} else {
 				PERROR("Port is not in output mode.\n");
 				err = ME_ERRNO_PREVIOUS_CONFIG;
 			}
 		} else {
 			PERROR("Invalid dword number.\n");
 			err = ME_ERRNO_INVALID_CHANNEL;
 		}
 		break;

 	default:
 		PERROR("Invalid flags specified.\n");
 		err = ME_ERRNO_INVALID_FLAGS;
 	}
 	spin_unlock(instance->ctrl_reg_lock);
 	spin_unlock(&instance->subdevice_lock);

 	ME_SUBDEVICE_EXIT;

 	return err;
 }

 static int me1000_dio_query_number_channels(struct me_subdevice *subdevice,
 					    int *number)
 {
 	PDEBUG("executed.\n");
 	*number = ME1000_DIO_NUMBER_CHANNELS;
 	return ME_ERRNO_SUCCESS;
 }

 static int me1000_dio_query_subdevice_type(struct me_subdevice *subdevice,
 					   int *type, int *subtype)
 {
 	PDEBUG("executed.\n");
 	*type = ME_TYPE_DIO;
 	*subtype = ME_SUBTYPE_SINGLE;
 	return ME_ERRNO_SUCCESS;
 }

 static int me1000_dio_query_subdevice_caps(struct me_subdevice *subdevice,
 					   int *caps)
 {
 	me1000_dio_subdevice_t *instance;

 	PDEBUG("executed.\n");

 	instance = (me1000_dio_subdevice_t *) subdevice;

 	*caps = ME_CAPS_DIO_DIR_DWORD;

 	return ME_ERRNO_SUCCESS;
 }

 me1000_dio_subdevice_t *me1000_dio_constructor(uint32_t reg_base,
 					       unsigned int dio_idx,
 					       spinlock_t *ctrl_reg_lock)
 {
 	me1000_dio_subdevice_t *subdevice;
 	int err;

 	PDEBUG("executed.\n");

 	/* Allocate memory for subdevice instance */
 	subdevice = kmalloc(sizeof(me1000_dio_subdevice_t), GFP_KERNEL);

 	if (!subdevice) {
 		PERROR("Cannot get memory for ME-1000 DIO instance.\n");
 		return NULL;
 	}

 	memset(subdevice, 0, sizeof(me1000_dio_subdevice_t));

 	/* Check if counter index is out of range */

 	if (dio_idx >= ME1000_DIO_NUMBER_PORTS) {
 		PERROR("DIO index is out of range.\n");
 		kfree(subdevice);
 		return NULL;
 	}

 	/* Initialize subdevice base class */
 	err = me_subdevice_init(&subdevice->base);

 	if (err) {
 		PERROR("Cannot initialize subdevice base class instance.\n");
 		kfree(subdevice);
 		return NULL;
 	}
 	// Initialize spin locks.
 	spin_lock_init(&subdevice->subdevice_lock);
 	subdevice->ctrl_reg_lock = ctrl_reg_lock;

 	/* Save the DIO index */
 	subdevice->dio_idx = dio_idx;

 	/* Initialize registers. */
 #ifdef MEDEBUG_DEBUG_REG
 	subdevice->reg_base = reg_base;
 #endif
 	subdevice->ctrl_reg = reg_base + ME1000_PORT_MODE;
 	subdevice->port_reg =
 	    reg_base + ME1000_PORT + (dio_idx * ME1000_PORT_STEP);

 	/* Override base class methods. */
 	subdevice->base.me_subdevice_io_reset_subdevice =
 	    me1000_dio_io_reset_subdevice;
 	subdevice->base.me_subdevice_io_single_config =
 	    me1000_dio_io_single_config;
 	subdevice->base.me_subdevice_io_single_read = me1000_dio_io_single_read;
 	subdevice->base.me_subdevice_io_single_write =
 	    me1000_dio_io_single_write;
 	subdevice->base.me_subdevice_query_number_channels =
 	    me1000_dio_query_number_channels;
 	subdevice->base.me_subdevice_query_subdevice_type =
 	    me1000_dio_query_subdevice_type;
 	subdevice->base.me_subdevice_query_subdevice_caps =
 	    me1000_dio_query_subdevice_caps;

 	return subdevice;
 }
	/**
	* @file me1000_dio.c
	*
	* @brief ME-1000 DIO subdevice instance.
	* @note Copyright (C) 2006 Meilhaus Electronic GmbH (support@meilhaus.de)
	* @author Guenter Gebhardt
	* @author Krzysztof Gantzke (k.gantzke@meilhaus.de)
	*/

	/*
	* Copyright (C) 2006 Meilhaus Electronic GmbH (support@meilhaus.de)
	*
	* This file 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., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#ifndef __KERNEL__
	# define __KERNEL__
	#endif

	/*
	* Includes
	*/
	#include <linux/module.h>

	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/io.h>
	#include <linux/types.h>

	#include "medefines.h"
	#include "meinternal.h"
	#include "meerror.h"
	#include "medebug.h"

	#include "me1000_dio_reg.h"
	#include "me1000_dio.h"

	/*
	* Defines
	*/
	#define ME1000_DIO_MAGIC_NUMBER 0x1000 /*< The magic number of the class structure. /

	/*
	* Functions
	*/

	static int me1000_dio_io_reset_subdevice(struct me_subdevice *subdevice,
	struct file *filep, int flags)
	{
	me1000_dio_subdevice_t *instance;
	uint32_t tmp;

	PDEBUG("executed.\n");

	instance = (me1000_dio_subdevice_t *) subdevice;

	if (flags) {
	PERROR("Invalid flag specified.\n");
	return ME_ERRNO_INVALID_FLAGS;
	}

	ME_SUBDEVICE_ENTER;

	spin_lock(&instance->subdevice_lock);
	spin_lock(instance->ctrl_reg_lock);
	tmp = inl(instance->ctrl_reg);
	tmp &= ~(0x1 << instance->dio_idx);
	outl(tmp, instance->ctrl_reg);
	PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
	instance->ctrl_reg - instance->reg_base, tmp);
	spin_unlock(instance->ctrl_reg_lock);

	outl(0x00000000, instance->port_reg);
	PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
	instance->ctrl_reg - instance->reg_base, 0);
	spin_unlock(&instance->subdevice_lock);

	ME_SUBDEVICE_EXIT;

	return ME_ERRNO_SUCCESS;
	}

	static int me1000_dio_io_single_config(struct me_subdevice *subdevice,
	struct file *filep,
	int channel,
	int single_config,
	int ref,
	int trig_chan,
	int trig_type, int trig_edge, int flags)
	{
	me1000_dio_subdevice_t *instance;
	int err = ME_ERRNO_SUCCESS;
	int ctrl;
	int size =
	flags & (ME_IO_SINGLE_CONFIG_DIO_BIT \| ME_IO_SINGLE_CONFIG_DIO_BYTE
	\| ME_IO_SINGLE_CONFIG_DIO_WORD \|
	ME_IO_SINGLE_CONFIG_DIO_DWORD);

	PDEBUG("executed.\n");

	instance = (me1000_dio_subdevice_t *) subdevice;

	ME_SUBDEVICE_ENTER;

	spin_lock(&instance->subdevice_lock);
	spin_lock(instance->ctrl_reg_lock);
	ctrl = inl(instance->ctrl_reg);

	switch (size) {
	case ME_IO_SINGLE_CONFIG_NO_FLAGS:
	case ME_IO_SINGLE_CONFIG_DIO_DWORD:
	if (channel == 0) {
	if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
	ctrl &= ~(0x1 << instance->dio_idx);
	} else if (single_config == ME_SINGLE_CONFIG_DIO_OUTPUT) {
	ctrl \|= 0x1 << instance->dio_idx;
	} else {
	PERROR("Invalid port direction.\n");
	err = ME_ERRNO_INVALID_SINGLE_CONFIG;
	}
	} else {
	PERROR("Invalid channel number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	default:
	PERROR("Invalid flags.\n");
	err = ME_ERRNO_INVALID_FLAGS;
	}

	if (!err) {
	outl(ctrl, instance->ctrl_reg);
	PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
	instance->reg_base,
	instance->ctrl_reg - instance->reg_base, ctrl);
	}
	spin_unlock(instance->ctrl_reg_lock);
	spin_unlock(&instance->subdevice_lock);

	ME_SUBDEVICE_EXIT;

	return err;
	}

	static int me1000_dio_io_single_read(struct me_subdevice *subdevice,
	struct file *filep,
	int channel,
	int *value, int time_out, int flags)
	{
	me1000_dio_subdevice_t *instance;
	int err = ME_ERRNO_SUCCESS;

	PDEBUG("executed.\n");

	instance = (me1000_dio_subdevice_t *) subdevice;

	ME_SUBDEVICE_ENTER;

	spin_lock(&instance->subdevice_lock);
	switch (flags) {
	case ME_IO_SINGLE_TYPE_DIO_BIT:
	if ((channel >= 0) && (channel < 32)) {
	*value = inl(instance->port_reg) & (0x1 << channel);
	} else {
	PERROR("Invalid bit number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	case ME_IO_SINGLE_TYPE_DIO_BYTE:
	if ((channel >= 0) && (channel < 4)) {
	*value =
	(inl(instance->port_reg) >> (channel * 8)) & 0xFF;
	} else {
	PERROR("Invalid byte number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	case ME_IO_SINGLE_TYPE_DIO_WORD:
	if ((channel >= 0) && (channel < 2)) {
	*value =
	(inl(instance->port_reg) >> (channel * 16)) &
	0xFFFF;
	} else {
	PERROR("Invalid word number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	case ME_IO_SINGLE_NO_FLAGS:
	case ME_IO_SINGLE_TYPE_DIO_DWORD:
	if (channel == 0) {
	*value = inl(instance->port_reg);
	} else {
	PERROR("Invalid dword number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	default:
	PERROR("Invalid flags specified.\n");
	err = ME_ERRNO_INVALID_FLAGS;
	}
	spin_unlock(&instance->subdevice_lock);

	ME_SUBDEVICE_EXIT;

	return err;
	}

	static int me1000_dio_io_single_write(struct me_subdevice *subdevice,
	struct file *filep,
	int channel,
	int value, int time_out, int flags)
	{
	me1000_dio_subdevice_t *instance;
	int err = ME_ERRNO_SUCCESS;
	uint32_t config;
	uint32_t state;

	PDEBUG("executed.\n");

	instance = (me1000_dio_subdevice_t *) subdevice;

	ME_SUBDEVICE_ENTER spin_lock(&instance->subdevice_lock);
	spin_lock(instance->ctrl_reg_lock);
	config = inl(instance->ctrl_reg) & (0x1 << instance->dio_idx);
	switch (flags) {
	case ME_IO_SINGLE_TYPE_DIO_BIT:
	if ((channel >= 0) && (channel < 32)) {
	if (config) {
	state = inl(instance->port_reg);
	state =
	value ? (state \| (0x1 << channel)) : (state
	&
	~(0x1
	<<
	channel));
	outl(state, instance->port_reg);
	PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
	instance->reg_base,
	instance->port_reg -
	instance->reg_base, state);
	} else {
	PERROR("Port is not in output mode.\n");
	err = ME_ERRNO_PREVIOUS_CONFIG;
	}
	} else {
	PERROR("Invalid bit number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	case ME_IO_SINGLE_TYPE_DIO_BYTE:
	if ((channel >= 0) && (channel < 4)) {
	if (config) {
	state = inl(instance->port_reg);
	state &= ~(0xFF << (channel * 8));
	state \|= (value & 0xFF) << (channel * 8);
	outl(state, instance->port_reg);
	PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
	instance->reg_base,
	instance->port_reg -
	instance->reg_base, state);
	} else {
	PERROR("Port is not in output mode.\n");
	err = ME_ERRNO_PREVIOUS_CONFIG;
	}
	} else {
	PERROR("Invalid byte number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	case ME_IO_SINGLE_TYPE_DIO_WORD:
	if ((channel >= 0) && (channel < 2)) {
	if (config) {
	state = inl(instance->port_reg);
	state &= ~(0xFFFF << (channel * 16));
	state \|= (value & 0xFFFF) << (channel * 16);
	outl(state, instance->port_reg);
	PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
	instance->reg_base,
	instance->port_reg -
	instance->reg_base, state);
	} else {
	PERROR("Port is not in output mode.\n");
	err = ME_ERRNO_PREVIOUS_CONFIG;
	}
	} else {
	PERROR("Invalid word number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	case ME_IO_SINGLE_NO_FLAGS:
	case ME_IO_SINGLE_TYPE_DIO_DWORD:
	if (channel == 0) {
	if (config) {
	outl(value, instance->port_reg);
	PDEBUG_REG("port_reg outl(0x%lX+0x%lX)=0x%x\n",
	instance->reg_base,
	instance->port_reg -
	instance->reg_base, value);
	} else {
	PERROR("Port is not in output mode.\n");
	err = ME_ERRNO_PREVIOUS_CONFIG;
	}
	} else {
	PERROR("Invalid dword number.\n");
	err = ME_ERRNO_INVALID_CHANNEL;
	}
	break;

	default:
	PERROR("Invalid flags specified.\n");
	err = ME_ERRNO_INVALID_FLAGS;
	}
	spin_unlock(instance->ctrl_reg_lock);
	spin_unlock(&instance->subdevice_lock);

	ME_SUBDEVICE_EXIT;

	return err;
	}

	static int me1000_dio_query_number_channels(struct me_subdevice *subdevice,
	int *number)
	{
	PDEBUG("executed.\n");
	*number = ME1000_DIO_NUMBER_CHANNELS;
	return ME_ERRNO_SUCCESS;
	}

	static int me1000_dio_query_subdevice_type(struct me_subdevice *subdevice,
	int type, int subtype)
	{
	PDEBUG("executed.\n");
	*type = ME_TYPE_DIO;
	*subtype = ME_SUBTYPE_SINGLE;
	return ME_ERRNO_SUCCESS;
	}

	static int me1000_dio_query_subdevice_caps(struct me_subdevice *subdevice,
	int *caps)
	{
	me1000_dio_subdevice_t *instance;

	PDEBUG("executed.\n");

	instance = (me1000_dio_subdevice_t *) subdevice;

	*caps = ME_CAPS_DIO_DIR_DWORD;

	return ME_ERRNO_SUCCESS;
	}

	me1000_dio_subdevice_t *me1000_dio_constructor(uint32_t reg_base,
	unsigned int dio_idx,
	spinlock_t *ctrl_reg_lock)
	{
	me1000_dio_subdevice_t *subdevice;
	int err;

	PDEBUG("executed.\n");

	/* Allocate memory for subdevice instance */
	subdevice = kmalloc(sizeof(me1000_dio_subdevice_t), GFP_KERNEL);

	if (!subdevice) {
	PERROR("Cannot get memory for ME-1000 DIO instance.\n");
	return NULL;
	}

	memset(subdevice, 0, sizeof(me1000_dio_subdevice_t));

	/* Check if counter index is out of range */

	if (dio_idx >= ME1000_DIO_NUMBER_PORTS) {
	PERROR("DIO index is out of range.\n");
	kfree(subdevice);
	return NULL;
	}

	/* Initialize subdevice base class */
	err = me_subdevice_init(&subdevice->base);

	if (err) {
	PERROR("Cannot initialize subdevice base class instance.\n");
	kfree(subdevice);
	return NULL;
	}
	// Initialize spin locks.
	spin_lock_init(&subdevice->subdevice_lock);
	subdevice->ctrl_reg_lock = ctrl_reg_lock;

	/* Save the DIO index */
	subdevice->dio_idx = dio_idx;

	/* Initialize registers. */
	#ifdef MEDEBUG_DEBUG_REG
	subdevice->reg_base = reg_base;
	#endif
	subdevice->ctrl_reg = reg_base + ME1000_PORT_MODE;
	subdevice->port_reg =
	reg_base + ME1000_PORT + (dio_idx * ME1000_PORT_STEP);

	/* Override base class methods. */
	subdevice->base.me_subdevice_io_reset_subdevice =
	me1000_dio_io_reset_subdevice;
	subdevice->base.me_subdevice_io_single_config =
	me1000_dio_io_single_config;
	subdevice->base.me_subdevice_io_single_read = me1000_dio_io_single_read;
	subdevice->base.me_subdevice_io_single_write =
	me1000_dio_io_single_write;
	subdevice->base.me_subdevice_query_number_channels =
	me1000_dio_query_number_channels;
	subdevice->base.me_subdevice_query_subdevice_type =
	me1000_dio_query_subdevice_type;
	subdevice->base.me_subdevice_query_subdevice_caps =
	me1000_dio_query_subdevice_caps;

	return subdevice;
	}