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mwavedd.c

/*
*
* mwavedd.c -- mwave device driver
*
*
* Written By: Mike Sullivan IBM Corporation
*
* Copyright (C) 1999 IBM Corporation
*
* 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.
*
* NO WARRANTY
* THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
* LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
* solely responsible for determining the appropriateness of using and
* distributing the Program and assumes all risks associated with its
* exercise of rights under this Agreement, including but not limited to
* the risks and costs of program errors, damage to or loss of data,
* programs or equipment, and unavailability or interruption of operations.
*
* DISCLAIMER OF LIABILITY
* NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
* HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
*
* 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
*
*
* 10/23/2000 - Alpha Release
*     First release to the public
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/miscdevice.h>
#include <linux/device.h>
#include <linux/serial.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/serial_8250.h>
#include "smapi.h"
#include "mwavedd.h"
#include "3780i.h"
#include "tp3780i.h"

MODULE_DESCRIPTION("3780i Advanced Communications Processor (Mwave) driver");
MODULE_AUTHOR("Mike Sullivan and Paul Schroeder");
MODULE_LICENSE("GPL");

/*
* These parameters support the setting of MWave resources. Note that no
* checks are made against other devices (ie. superio) for conflicts.
* We'll depend on users using the tpctl utility to do that for now
*/
int mwave_debug = 0;
int mwave_3780i_irq = 0;
int mwave_3780i_io = 0;
int mwave_uart_irq = 0;
int mwave_uart_io = 0;
module_param(mwave_debug, int, 0);
module_param(mwave_3780i_irq, int, 0);
module_param(mwave_3780i_io, int, 0);
module_param(mwave_uart_irq, int, 0);
module_param(mwave_uart_io, int, 0);

static int mwave_open(struct inode *inode, struct file *file);
static int mwave_close(struct inode *inode, struct file *file);
static int mwave_ioctl(struct inode *inode, struct file *filp,
                       unsigned int iocmd, unsigned long ioarg);

MWAVE_DEVICE_DATA mwave_s_mdd;

static int mwave_open(struct inode *inode, struct file *file)
{
      unsigned int retval = 0;

      PRINTK_3(TRACE_MWAVE,
            "mwavedd::mwave_open, entry inode %p file %p\n",
             inode, file);
      PRINTK_2(TRACE_MWAVE,
            "mwavedd::mwave_open, exit return retval %x\n", retval);

      return retval;
}

static int mwave_close(struct inode *inode, struct file *file)
{
      unsigned int retval = 0;

      PRINTK_3(TRACE_MWAVE,
            "mwavedd::mwave_close, entry inode %p file %p\n",
             inode,  file);

      PRINTK_2(TRACE_MWAVE, "mwavedd::mwave_close, exit retval %x\n",
            retval);

      return retval;
}

static int mwave_ioctl(struct inode *inode, struct file *file,
                       unsigned int iocmd, unsigned long ioarg)
{
      unsigned int retval = 0;
      pMWAVE_DEVICE_DATA pDrvData = &mwave_s_mdd;
      void __user *arg = (void __user *)ioarg;

      PRINTK_5(TRACE_MWAVE,
            "mwavedd::mwave_ioctl, entry inode %p file %p cmd %x arg %x\n",
             inode,  file, iocmd, (int) ioarg);

      switch (iocmd) {

            case IOCTL_MW_RESET:
                  PRINTK_1(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl, IOCTL_MW_RESET"
                        " calling tp3780I_ResetDSP\n");
                  retval = tp3780I_ResetDSP(&pDrvData->rBDData);
                  PRINTK_2(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl, IOCTL_MW_RESET"
                        " retval %x from tp3780I_ResetDSP\n",
                        retval);
                  break;
      
            case IOCTL_MW_RUN:
                  PRINTK_1(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl, IOCTL_MW_RUN"
                        " calling tp3780I_StartDSP\n");
                  retval = tp3780I_StartDSP(&pDrvData->rBDData);
                  PRINTK_2(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl, IOCTL_MW_RUN"
                        " retval %x from tp3780I_StartDSP\n",
                        retval);
                  break;
      
            case IOCTL_MW_DSP_ABILITIES: {
                  MW_ABILITIES rAbilities;
      
                  PRINTK_1(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl,"
                        " IOCTL_MW_DSP_ABILITIES calling"
                        " tp3780I_QueryAbilities\n");
                  retval = tp3780I_QueryAbilities(&pDrvData->rBDData,
                              &rAbilities);
                  PRINTK_2(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl, IOCTL_MW_DSP_ABILITIES"
                        " retval %x from tp3780I_QueryAbilities\n",
                        retval);
                  if (retval == 0) {
                        if( copy_to_user(arg, &rAbilities,
                                          sizeof(MW_ABILITIES)) )
                              return -EFAULT;
                  }
                  PRINTK_2(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl, IOCTL_MW_DSP_ABILITIES"
                        " exit retval %x\n",
                        retval);
            }
                  break;
      
            case IOCTL_MW_READ_DATA:
            case IOCTL_MW_READCLEAR_DATA: {
                  MW_READWRITE rReadData;
                  unsigned short __user *pusBuffer = NULL;
      
                  if( copy_from_user(&rReadData, arg,
                                    sizeof(MW_READWRITE)) )
                        return -EFAULT;
                  pusBuffer = (unsigned short __user *) (rReadData.pBuf);
      
                  PRINTK_4(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_READ_DATA,"
                        " size %lx, ioarg %lx pusBuffer %p\n",
                        rReadData.ulDataLength, ioarg, pusBuffer);
                  retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
                              iocmd,
                              pusBuffer,
                              rReadData.ulDataLength,
                              rReadData.usDspAddress);
            }
                  break;
      
            case IOCTL_MW_READ_INST: {
                  MW_READWRITE rReadData;
                  unsigned short __user *pusBuffer = NULL;
      
                  if( copy_from_user(&rReadData, arg,
                                    sizeof(MW_READWRITE)) )
                        return -EFAULT;
                  pusBuffer = (unsigned short __user *) (rReadData.pBuf);
      
                  PRINTK_4(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_READ_INST,"
                        " size %lx, ioarg %lx pusBuffer %p\n",
                        rReadData.ulDataLength / 2, ioarg,
                        pusBuffer);
                  retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
                        iocmd, pusBuffer,
                        rReadData.ulDataLength / 2,
                        rReadData.usDspAddress);
            }
                  break;
      
            case IOCTL_MW_WRITE_DATA: {
                  MW_READWRITE rWriteData;
                  unsigned short __user *pusBuffer = NULL;
      
                  if( copy_from_user(&rWriteData, arg,
                                    sizeof(MW_READWRITE)) )
                        return -EFAULT;
                  pusBuffer = (unsigned short __user *) (rWriteData.pBuf);
      
                  PRINTK_4(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_WRITE_DATA,"
                        " size %lx, ioarg %lx pusBuffer %p\n",
                        rWriteData.ulDataLength, ioarg,
                        pusBuffer);
                  retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
                              iocmd, pusBuffer,
                              rWriteData.ulDataLength,
                              rWriteData.usDspAddress);
            }
                  break;
      
            case IOCTL_MW_WRITE_INST: {
                  MW_READWRITE rWriteData;
                  unsigned short __user *pusBuffer = NULL;
      
                  if( copy_from_user(&rWriteData, arg,
                                    sizeof(MW_READWRITE)) )
                        return -EFAULT;
                  pusBuffer = (unsigned short __user *)(rWriteData.pBuf);
      
                  PRINTK_4(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_WRITE_INST,"
                        " size %lx, ioarg %lx pusBuffer %p\n",
                        rWriteData.ulDataLength, ioarg,
                        pusBuffer);
                  retval = tp3780I_ReadWriteDspIStore(&pDrvData->rBDData,
                              iocmd, pusBuffer,
                              rWriteData.ulDataLength,
                              rWriteData.usDspAddress);
            }
                  break;
      
            case IOCTL_MW_REGISTER_IPC: {
                  unsigned int ipcnum = (unsigned int) ioarg;
      
                  PRINTK_3(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_REGISTER_IPC"
                        " ipcnum %x entry usIntCount %x\n",
                        ipcnum,
                        pDrvData->IPCs[ipcnum].usIntCount);
      
                  if (ipcnum >= ARRAY_SIZE(pDrvData->IPCs)) {
                        PRINTK_ERROR(KERN_ERR_MWAVE
                                    "mwavedd::mwave_ioctl:"
                                    " IOCTL_MW_REGISTER_IPC:"
                                    " Error: Invalid ipcnum %x\n",
                                    ipcnum);
                        return -EINVAL;
                  }
                  pDrvData->IPCs[ipcnum].bIsHere = FALSE;
                  pDrvData->IPCs[ipcnum].bIsEnabled = TRUE;
      
                  PRINTK_2(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_REGISTER_IPC"
                        " ipcnum %x exit\n",
                        ipcnum);
            }
                  break;
      
            case IOCTL_MW_GET_IPC: {
                  unsigned int ipcnum = (unsigned int) ioarg;
      
                  PRINTK_3(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_GET_IPC"
                        " ipcnum %x, usIntCount %x\n",
                        ipcnum,
                        pDrvData->IPCs[ipcnum].usIntCount);
                  if (ipcnum >= ARRAY_SIZE(pDrvData->IPCs)) {
                        PRINTK_ERROR(KERN_ERR_MWAVE
                                    "mwavedd::mwave_ioctl:"
                                    " IOCTL_MW_GET_IPC: Error:"
                                    " Invalid ipcnum %x\n", ipcnum);
                        return -EINVAL;
                  }
      
                  if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
                        DECLARE_WAITQUEUE(wait, current);

                        PRINTK_2(TRACE_MWAVE,
                              "mwavedd::mwave_ioctl, thread for"
                              " ipc %x going to sleep\n",
                              ipcnum);
                        add_wait_queue(&pDrvData->IPCs[ipcnum].ipc_wait_queue, &wait);
                        pDrvData->IPCs[ipcnum].bIsHere = TRUE;
                        set_current_state(TASK_INTERRUPTIBLE);
                        /* check whether an event was signalled by */
                        /* the interrupt handler while we were gone */
                        if (pDrvData->IPCs[ipcnum].usIntCount == 1) {   /* first int has occurred (race condition) */
                              pDrvData->IPCs[ipcnum].usIntCount = 2;    /* first int has been handled */
                              PRINTK_2(TRACE_MWAVE,
                                    "mwavedd::mwave_ioctl"
                                    " IOCTL_MW_GET_IPC ipcnum %x"
                                    " handling first int\n",
                                    ipcnum);
                        } else {    /* either 1st int has not yet occurred, or we have already handled the first int */
                              schedule();
                              if (pDrvData->IPCs[ipcnum].usIntCount == 1) {
                                    pDrvData->IPCs[ipcnum].usIntCount = 2;
                              }
                              PRINTK_2(TRACE_MWAVE,
                                    "mwavedd::mwave_ioctl"
                                    " IOCTL_MW_GET_IPC ipcnum %x"
                                    " woke up and returning to"
                                    " application\n",
                                    ipcnum);
                        }
                        pDrvData->IPCs[ipcnum].bIsHere = FALSE;
                        remove_wait_queue(&pDrvData->IPCs[ipcnum].ipc_wait_queue, &wait);
                        set_current_state(TASK_RUNNING);
                        PRINTK_2(TRACE_MWAVE,
                              "mwavedd::mwave_ioctl IOCTL_MW_GET_IPC,"
                              " returning thread for ipc %x"
                              " processing\n",
                              ipcnum);
                  }
            }
                  break;
      
            case IOCTL_MW_UNREGISTER_IPC: {
                  unsigned int ipcnum = (unsigned int) ioarg;
      
                  PRINTK_2(TRACE_MWAVE,
                        "mwavedd::mwave_ioctl IOCTL_MW_UNREGISTER_IPC"
                        " ipcnum %x\n",
                        ipcnum);
                  if (ipcnum >= ARRAY_SIZE(pDrvData->IPCs)) {
                        PRINTK_ERROR(KERN_ERR_MWAVE
                                    "mwavedd::mwave_ioctl:"
                                    " IOCTL_MW_UNREGISTER_IPC:"
                                    " Error: Invalid ipcnum %x\n",
                                    ipcnum);
                        return -EINVAL;
                  }
                  if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
                        pDrvData->IPCs[ipcnum].bIsEnabled = FALSE;
                        if (pDrvData->IPCs[ipcnum].bIsHere == TRUE) {
                              wake_up_interruptible(&pDrvData->IPCs[ipcnum].ipc_wait_queue);
                        }
                  }
            }
                  break;
      
            default:
                  PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::mwave_ioctl:"
                              " Error: Unrecognized iocmd %x\n",
                              iocmd);
                  return -ENOTTY;
                  break;
      } /* switch */

      PRINTK_2(TRACE_MWAVE, "mwavedd::mwave_ioctl, exit retval %x\n", retval);

      return retval;
}


static ssize_t mwave_read(struct file *file, char __user *buf, size_t count,
                          loff_t * ppos)
{
      PRINTK_5(TRACE_MWAVE,
            "mwavedd::mwave_read entry file %p, buf %p, count %zx ppos %p\n",
            file, buf, count, ppos);

      return -EINVAL;
}


static ssize_t mwave_write(struct file *file, const char __user *buf,
                           size_t count, loff_t * ppos)
{
      PRINTK_5(TRACE_MWAVE,
            "mwavedd::mwave_write entry file %p, buf %p,"
            " count %zx ppos %p\n",
            file, buf, count, ppos);

      return -EINVAL;
}


static int register_serial_portandirq(unsigned int port, int irq)
{
      struct uart_port uart;
      
      switch ( port ) {
            case 0x3f8:
            case 0x2f8:
            case 0x3e8:
            case 0x2e8:
                  /* OK */
                  break;
            default:
                  PRINTK_ERROR(KERN_ERR_MWAVE
                              "mwavedd::register_serial_portandirq:"
                              " Error: Illegal port %x\n", port );
                  return -1;
      } /* switch */
      /* port is okay */

      switch ( irq ) {
            case 3:
            case 4:
            case 5:
            case 7:
                  /* OK */
                  break;
            default:
                  PRINTK_ERROR(KERN_ERR_MWAVE
                              "mwavedd::register_serial_portandirq:"
                              " Error: Illegal irq %x\n", irq );
                  return -1;
      } /* switch */
      /* irq is okay */

      memset(&uart, 0, sizeof(struct uart_port));
      
      uart.uartclk =  1843200;
      uart.iobase = port;
      uart.irq = irq;
      uart.iotype = UPIO_PORT;
      uart.flags =  UPF_SHARE_IRQ;
      return serial8250_register_port(&uart);
}


static const struct file_operations mwave_fops = {
      .owner            = THIS_MODULE,
      .read       = mwave_read,
      .write            = mwave_write,
      .ioctl            = mwave_ioctl,
      .open       = mwave_open,
      .release    = mwave_close
};


static struct miscdevice mwave_misc_dev = { MWAVE_MINOR, "mwave", &mwave_fops };

#if 0 /* totally b0rked */
/*
 * sysfs support <paulsch@us.ibm.com>
 */

struct device mwave_device;

/* Prevent code redundancy, create a macro for mwave_show_* functions. */
#define mwave_show_function(attr_name, format_string, field)            \
static ssize_t mwave_show_##attr_name(struct device *dev, struct device_attribute *attr, char *buf)   \
{                                                     \
      DSP_3780I_CONFIG_SETTINGS *pSettings =                      \
            &mwave_s_mdd.rBDData.rDspSettings;              \
        return sprintf(buf, format_string, pSettings->field);           \
}

/* All of our attributes are read attributes. */
#define mwave_dev_rd_attr(attr_name, format_string, field)        \
      mwave_show_function(attr_name, format_string, field)        \
static DEVICE_ATTR(attr_name, S_IRUGO, mwave_show_##attr_name, NULL)

mwave_dev_rd_attr (3780i_dma, "%i\n", usDspDma);
mwave_dev_rd_attr (3780i_irq, "%i\n", usDspIrq);
mwave_dev_rd_attr (3780i_io, "%#.4x\n", usDspBaseIO);
mwave_dev_rd_attr (uart_irq, "%i\n", usUartIrq);
mwave_dev_rd_attr (uart_io, "%#.4x\n", usUartBaseIO);

static struct device_attribute * const mwave_dev_attrs[] = {
      &dev_attr_3780i_dma,
      &dev_attr_3780i_irq,
      &dev_attr_3780i_io,
      &dev_attr_uart_irq,
      &dev_attr_uart_io,
};
#endif

/*
* mwave_init is called on module load
*
* mwave_exit is called on module unload
* mwave_exit is also used to clean up after an aborted mwave_init
*/
static void mwave_exit(void)
{
      pMWAVE_DEVICE_DATA pDrvData = &mwave_s_mdd;

      PRINTK_1(TRACE_MWAVE, "mwavedd::mwave_exit entry\n");

#if 0
      for (i = 0; i < pDrvData->nr_registered_attrs; i++)
            device_remove_file(&mwave_device, mwave_dev_attrs[i]);
      pDrvData->nr_registered_attrs = 0;

      if (pDrvData->device_registered) {
            device_unregister(&mwave_device);
            pDrvData->device_registered = FALSE;
      }
#endif

      if ( pDrvData->sLine >= 0 ) {
            serial8250_unregister_port(pDrvData->sLine);
      }
      if (pDrvData->bMwaveDevRegistered) {
            misc_deregister(&mwave_misc_dev);
      }
      if (pDrvData->bDSPEnabled) {
            tp3780I_DisableDSP(&pDrvData->rBDData);
      }
      if (pDrvData->bResourcesClaimed) {
            tp3780I_ReleaseResources(&pDrvData->rBDData);
      }
      if (pDrvData->bBDInitialized) {
            tp3780I_Cleanup(&pDrvData->rBDData);
      }

      PRINTK_1(TRACE_MWAVE, "mwavedd::mwave_exit exit\n");
}

module_exit(mwave_exit);

static int __init mwave_init(void)
{
      int i;
      int retval = 0;
      pMWAVE_DEVICE_DATA pDrvData = &mwave_s_mdd;

      PRINTK_1(TRACE_MWAVE, "mwavedd::mwave_init entry\n");

      memset(&mwave_s_mdd, 0, sizeof(MWAVE_DEVICE_DATA));

      pDrvData->bBDInitialized = FALSE;
      pDrvData->bResourcesClaimed = FALSE;
      pDrvData->bDSPEnabled = FALSE;
      pDrvData->bDSPReset = FALSE;
      pDrvData->bMwaveDevRegistered = FALSE;
      pDrvData->sLine = -1;

      for (i = 0; i < ARRAY_SIZE(pDrvData->IPCs); i++) {
            pDrvData->IPCs[i].bIsEnabled = FALSE;
            pDrvData->IPCs[i].bIsHere = FALSE;
            pDrvData->IPCs[i].usIntCount = 0;   /* no ints received yet */
            init_waitqueue_head(&pDrvData->IPCs[i].ipc_wait_queue);
      }

      retval = tp3780I_InitializeBoardData(&pDrvData->rBDData);
      PRINTK_2(TRACE_MWAVE,
            "mwavedd::mwave_init, return from tp3780I_InitializeBoardData"
            " retval %x\n",
            retval);
      if (retval) {
            PRINTK_ERROR(KERN_ERR_MWAVE
                        "mwavedd::mwave_init: Error:"
                        " Failed to initialize board data\n");
            goto cleanup_error;
      }
      pDrvData->bBDInitialized = TRUE;

      retval = tp3780I_CalcResources(&pDrvData->rBDData);
      PRINTK_2(TRACE_MWAVE,
            "mwavedd::mwave_init, return from tp3780I_CalcResources"
            " retval %x\n",
            retval);
      if (retval) {
            PRINTK_ERROR(KERN_ERR_MWAVE
                        "mwavedd:mwave_init: Error:"
                        " Failed to calculate resources\n");
            goto cleanup_error;
      }

      retval = tp3780I_ClaimResources(&pDrvData->rBDData);
      PRINTK_2(TRACE_MWAVE,
            "mwavedd::mwave_init, return from tp3780I_ClaimResources"
            " retval %x\n",
            retval);
      if (retval) {
            PRINTK_ERROR(KERN_ERR_MWAVE
                        "mwavedd:mwave_init: Error:"
                        " Failed to claim resources\n");
            goto cleanup_error;
      }
      pDrvData->bResourcesClaimed = TRUE;

      retval = tp3780I_EnableDSP(&pDrvData->rBDData);
      PRINTK_2(TRACE_MWAVE,
            "mwavedd::mwave_init, return from tp3780I_EnableDSP"
            " retval %x\n",
            retval);
      if (retval) {
            PRINTK_ERROR(KERN_ERR_MWAVE
                        "mwavedd:mwave_init: Error:"
                        " Failed to enable DSP\n");
            goto cleanup_error;
      }
      pDrvData->bDSPEnabled = TRUE;

      if (misc_register(&mwave_misc_dev) < 0) {
            PRINTK_ERROR(KERN_ERR_MWAVE
                        "mwavedd:mwave_init: Error:"
                        " Failed to register misc device\n");
            goto cleanup_error;
      }
      pDrvData->bMwaveDevRegistered = TRUE;

      pDrvData->sLine = register_serial_portandirq(
            pDrvData->rBDData.rDspSettings.usUartBaseIO,
            pDrvData->rBDData.rDspSettings.usUartIrq
      );
      if (pDrvData->sLine < 0) {
            PRINTK_ERROR(KERN_ERR_MWAVE
                        "mwavedd:mwave_init: Error:"
                        " Failed to register serial driver\n");
            goto cleanup_error;
      }
      /* uart is registered */

#if 0
      /* sysfs */
      memset(&mwave_device, 0, sizeof (struct device));
      snprintf(mwave_device.bus_id, BUS_ID_SIZE, "mwave");

      if (device_register(&mwave_device))
            goto cleanup_error;
      pDrvData->device_registered = TRUE;
      for (i = 0; i < ARRAY_SIZE(mwave_dev_attrs); i++) {
            if(device_create_file(&mwave_device, mwave_dev_attrs[i])) {
                  PRINTK_ERROR(KERN_ERR_MWAVE
                              "mwavedd:mwave_init: Error:"
                              " Failed to create sysfs file %s\n",
                              mwave_dev_attrs[i]->attr.name);
                  goto cleanup_error;
            }
            pDrvData->nr_registered_attrs++;
      }
#endif

      /* SUCCESS! */
      return 0;

cleanup_error:
      PRINTK_ERROR(KERN_ERR_MWAVE
                  "mwavedd::mwave_init: Error:"
                  " Failed to initialize\n");
      mwave_exit(); /* clean up */

      return -EIO;
}

module_init(mwave_init);


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