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/**
* @file me0900_di.c
*
* @brief ME-9x digital input subdevice instance.
* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
* @author Guenter Gebhardt
*/
/*
* Copyright (C) 2007 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 <linux/interrupt.h>
#include <linux/version.h>
#include "medefines.h"
#include "meinternal.h"
#include "meerror.h"
#include "meids.h"
#include "medebug.h"
#include "meplx_reg.h"
#include "me0900_reg.h"
#include "me0900_di.h"
/*
* Defines
*/
/*
* Functions
*/
static int me0900_di_io_reset_subdevice(struct me_subdevice *subdevice,
struct file *filep, int flags)
{
PDEBUG("executed.\n");
if (flags) {
PERROR("Invalid flag specified.\n");
return ME_ERRNO_INVALID_FLAGS;
}
return ME_ERRNO_SUCCESS;
}
static int me0900_di_io_single_config(me_subdevice_t *subdevice,
struct file *filep,
int channel,
int single_config,
int ref,
int trig_chan,
int trig_type, int trig_edge, int flags)
{
me0900_di_subdevice_t *instance;
int err = ME_ERRNO_SUCCESS;
PDEBUG("executed.\n");
instance = (me0900_di_subdevice_t *) subdevice;
ME_SUBDEVICE_ENTER;
spin_lock(&instance->subdevice_lock);
switch (flags) {
case ME_IO_SINGLE_CONFIG_NO_FLAGS:
case ME_IO_SINGLE_TYPE_DIO_BYTE:
if (channel == 0) {
if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
} else {
PERROR("Invalid byte direction specified.\n");
err = ME_ERRNO_INVALID_SINGLE_CONFIG;
}
} else {
PERROR("Invalid byte number specified.\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 me0900_di_io_single_read(me_subdevice_t *subdevice,
struct file *filep,
int channel,
int *value, int time_out, int flags)
{
me0900_di_subdevice_t *instance;
int err = ME_ERRNO_SUCCESS;
PDEBUG("executed.\n");
instance = (me0900_di_subdevice_t *) subdevice;
ME_SUBDEVICE_ENTER;
spin_lock(&instance->subdevice_lock);
switch (flags) {
case ME_IO_SINGLE_TYPE_DIO_BIT:
if ((channel >= 0) && (channel < 8)) {
*value = (~inb(instance->port_reg)) & (0x1 << channel);
} else {
PERROR("Invalid bit number specified.\n");
err = ME_ERRNO_INVALID_CHANNEL;
}
break;
case ME_IO_SINGLE_NO_FLAGS:
case ME_IO_SINGLE_TYPE_DIO_BYTE:
if (channel == 0) {
*value = ~inb(instance->port_reg);
} else {
PERROR("Invalid byte number specified.\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 me0900_di_query_number_channels(me_subdevice_t *subdevice,
int *number)
{
PDEBUG("executed.\n");
*number = 8;
return ME_ERRNO_SUCCESS;
}
static int me0900_di_query_subdevice_type(me_subdevice_t *subdevice,
int *type, int *subtype)
{
PDEBUG("executed.\n");
*type = ME_TYPE_DI;
*subtype = ME_SUBTYPE_SINGLE;
return ME_ERRNO_SUCCESS;
}
static int me0900_di_query_subdevice_caps(me_subdevice_t *subdevice, int *caps)
{
PDEBUG("executed.\n");
*caps = 0;
return ME_ERRNO_SUCCESS;
}
me0900_di_subdevice_t *me0900_di_constructor(uint32_t reg_base,
unsigned int di_idx)
{
me0900_di_subdevice_t *subdevice;
int err;
PDEBUG("executed.\n");
/* Allocate memory for subdevice instance */
subdevice = kmalloc(sizeof(me0900_di_subdevice_t), GFP_KERNEL);
if (!subdevice) {
PERROR("Cannot get memory for subdevice instance.\n");
return NULL;
}
memset(subdevice, 0, sizeof(me0900_di_subdevice_t));
/* 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);
/* Save the subdevice index. */
subdevice->di_idx = di_idx;
/* Initialize registers */
if (di_idx == 0) {
subdevice->ctrl_reg = reg_base + ME0900_CTRL_REG;
subdevice->port_reg = reg_base + ME0900_PORT_A_REG;
} else {
subdevice->ctrl_reg = reg_base + ME0900_CTRL_REG;
subdevice->port_reg = reg_base + ME0900_PORT_B_REG;
}
#ifdef MEDEBUG_DEBUG_REG
subdevice->reg_base = reg_base;
#endif
/* Overload base class methods. */
subdevice->base.me_subdevice_io_reset_subdevice =
me0900_di_io_reset_subdevice;
subdevice->base.me_subdevice_io_single_config =
me0900_di_io_single_config;
subdevice->base.me_subdevice_io_single_read = me0900_di_io_single_read;
subdevice->base.me_subdevice_query_number_channels =
me0900_di_query_number_channels;
subdevice->base.me_subdevice_query_subdevice_type =
me0900_di_query_subdevice_type;
subdevice->base.me_subdevice_query_subdevice_caps =
me0900_di_query_subdevice_caps;
return subdevice;
}
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