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smapi.c

/*
*
* smapi.c -- SMAPI interface routines
*
*
* 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/kernel.h>
#include <linux/mc146818rtc.h>      /* CMOS defines */
#include "smapi.h"
#include "mwavedd.h"

static unsigned short g_usSmapiPort = 0;


static int smapi_request(unsigned short inBX, unsigned short inCX,
                   unsigned short inDI, unsigned short inSI,
                   unsigned short *outAX, unsigned short *outBX,
                   unsigned short *outCX, unsigned short *outDX,
                   unsigned short *outDI, unsigned short *outSI)
{
      unsigned short myoutAX = 2, *pmyoutAX = &myoutAX;
      unsigned short myoutBX = 3, *pmyoutBX = &myoutBX;
      unsigned short myoutCX = 4, *pmyoutCX = &myoutCX;
      unsigned short myoutDX = 5, *pmyoutDX = &myoutDX;
      unsigned short myoutDI = 6, *pmyoutDI = &myoutDI;
      unsigned short myoutSI = 7, *pmyoutSI = &myoutSI;
      unsigned short usSmapiOK = -EIO, *pusSmapiOK = &usSmapiOK;
      unsigned int inBXCX = (inBX << 16) | inCX;
      unsigned int inDISI = (inDI << 16) | inSI;
      int retval = 0;

      PRINTK_5(TRACE_SMAPI, "inBX %x inCX %x inDI %x inSI %x\n",
            inBX, inCX, inDI, inSI);

      __asm__ __volatile__("movw  $0x5380,%%ax\n\t"
                      "movl  %7,%%ebx\n\t"
                      "shrl  $16, %%ebx\n\t"
                      "movw  %7,%%cx\n\t"
                      "movl  %8,%%edi\n\t"
                      "shrl  $16,%%edi\n\t"
                      "movw  %8,%%si\n\t"
                      "movw  %9,%%dx\n\t"
                      "out   %%al,%%dx\n\t"
                      "out   %%al,$0x4F\n\t"
                      "cmpb  $0x53,%%ah\n\t"
                      "je    2f\n\t"
                      "1:\n\t"
                      "orb   %%ah,%%ah\n\t"
                      "jnz   2f\n\t"
                      "movw  %%ax,%0\n\t"
                      "movw  %%bx,%1\n\t"
                      "movw  %%cx,%2\n\t"
                      "movw  %%dx,%3\n\t"
                      "movw  %%di,%4\n\t"
                      "movw  %%si,%5\n\t"
                      "movw  $1,%6\n\t"
                      "2:\n\t":"=m"(*(unsigned short *) pmyoutAX),
                      "=m"(*(unsigned short *) pmyoutBX),
                      "=m"(*(unsigned short *) pmyoutCX),
                      "=m"(*(unsigned short *) pmyoutDX),
                      "=m"(*(unsigned short *) pmyoutDI),
                      "=m"(*(unsigned short *) pmyoutSI),
                      "=m"(*(unsigned short *) pusSmapiOK)
                      :"m"(inBXCX), "m"(inDISI), "m"(g_usSmapiPort)
                      :"%eax", "%ebx", "%ecx", "%edx", "%edi",
                      "%esi");

      PRINTK_8(TRACE_SMAPI,
            "myoutAX %x myoutBX %x myoutCX %x myoutDX %x myoutDI %x myoutSI %x usSmapiOK %x\n",
            myoutAX, myoutBX, myoutCX, myoutDX, myoutDI, myoutSI,
            usSmapiOK);
      *outAX = myoutAX;
      *outBX = myoutBX;
      *outCX = myoutCX;
      *outDX = myoutDX;
      *outDI = myoutDI;
      *outSI = myoutSI;

      retval = (usSmapiOK == 1) ? 0 : -EIO;
      PRINTK_2(TRACE_SMAPI, "smapi::smapi_request exit retval %x\n", retval);
      return retval;
}


int smapi_query_DSP_cfg(SMAPI_DSP_SETTINGS * pSettings)
{
      int bRC = -EIO;
      unsigned short usAX, usBX, usCX, usDX, usDI, usSI;
      unsigned short ausDspBases[] = { 0x0030, 0x4E30, 0x8E30, 0xCE30, 0x0130, 0x0350, 0x0070, 0x0DB0 };
      unsigned short ausUartBases[] = { 0x03F8, 0x02F8, 0x03E8, 0x02E8 };
      unsigned short numDspBases = 8;
      unsigned short numUartBases = 4;

      PRINTK_1(TRACE_SMAPI, "smapi::smapi_query_DSP_cfg entry\n");

      bRC = smapi_request(0x1802, 0x0000, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) {
            PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_query_DSP_cfg: Error: Could not get DSP Settings. Aborting.\n");
            return bRC;
      }

      PRINTK_1(TRACE_SMAPI, "smapi::smapi_query_DSP_cfg, smapi_request OK\n");

      pSettings->bDSPPresent = ((usBX & 0x0100) != 0);
      pSettings->bDSPEnabled = ((usCX & 0x0001) != 0);
      pSettings->usDspIRQ = usSI & 0x00FF;
      pSettings->usDspDMA = (usSI & 0xFF00) >> 8;
      if ((usDI & 0x00FF) < numDspBases) {
            pSettings->usDspBaseIO = ausDspBases[usDI & 0x00FF];
      } else {
            pSettings->usDspBaseIO = 0;
      }
      PRINTK_6(TRACE_SMAPI,
            "smapi::smapi_query_DSP_cfg get DSP Settings bDSPPresent %x bDSPEnabled %x usDspIRQ %x usDspDMA %x usDspBaseIO %x\n",
            pSettings->bDSPPresent, pSettings->bDSPEnabled,
            pSettings->usDspIRQ, pSettings->usDspDMA,
            pSettings->usDspBaseIO);

      /* check for illegal values */
      if ( pSettings->usDspBaseIO == 0 ) 
            PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_query_DSP_cfg: Worry: DSP base I/O address is 0\n");
      if ( pSettings->usDspIRQ == 0 )
            PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_query_DSP_cfg: Worry: DSP IRQ line is 0\n");

      bRC = smapi_request(0x1804, 0x0000, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) {
            PRINTK_ERROR("smapi::smapi_query_DSP_cfg: Error: Could not get DSP modem settings. Aborting.\n");
            return bRC;
      } 

      PRINTK_1(TRACE_SMAPI, "smapi::smapi_query_DSP_cfg, smapi_request OK\n");

      pSettings->bModemEnabled = ((usCX & 0x0001) != 0);
      pSettings->usUartIRQ = usSI & 0x000F;
      if (((usSI & 0xFF00) >> 8) < numUartBases) {
            pSettings->usUartBaseIO = ausUartBases[(usSI & 0xFF00) >> 8];
      } else {
            pSettings->usUartBaseIO = 0;
      }

      PRINTK_4(TRACE_SMAPI,
            "smapi::smapi_query_DSP_cfg get DSP modem settings bModemEnabled %x usUartIRQ %x usUartBaseIO %x\n",
            pSettings->bModemEnabled,
            pSettings->usUartIRQ,
            pSettings->usUartBaseIO);

      /* check for illegal values */
      if ( pSettings->usUartBaseIO == 0 ) 
            PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_query_DSP_cfg: Worry: UART base I/O address is 0\n");
      if ( pSettings->usUartIRQ == 0 )
            PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_query_DSP_cfg: Worry: UART IRQ line is 0\n");

      PRINTK_2(TRACE_SMAPI, "smapi::smapi_query_DSP_cfg exit bRC %x\n", bRC);

      return bRC;
}


int smapi_set_DSP_cfg(void)
{
      int bRC = -EIO;
      int i;
      unsigned short usAX, usBX, usCX, usDX, usDI, usSI;
      unsigned short ausDspBases[] = { 0x0030, 0x4E30, 0x8E30, 0xCE30, 0x0130, 0x0350, 0x0070, 0x0DB0 };
      unsigned short ausUartBases[] = { 0x03F8, 0x02F8, 0x03E8, 0x02E8 };
      unsigned short ausDspIrqs[] = { 5, 7, 10, 11, 15 };
      unsigned short ausUartIrqs[] = { 3, 4 };

      unsigned short numDspBases = 8;
      unsigned short numUartBases = 4;
      unsigned short numDspIrqs = 5;
      unsigned short numUartIrqs = 2;
      unsigned short dspio_index = 0, uartio_index = 0;

      PRINTK_5(TRACE_SMAPI,
            "smapi::smapi_set_DSP_cfg entry mwave_3780i_irq %x mwave_3780i_io %x mwave_uart_irq %x mwave_uart_io %x\n",
            mwave_3780i_irq, mwave_3780i_io, mwave_uart_irq, mwave_uart_io);

      if (mwave_3780i_io) {
            for (i = 0; i < numDspBases; i++) {
                  if (mwave_3780i_io == ausDspBases[i])
                        break;
            }
            if (i == numDspBases) {
                  PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_set_DSP_cfg: Error: Invalid mwave_3780i_io address %x. Aborting.\n", mwave_3780i_io);
                  return bRC;
            }
            dspio_index = i;
      }

      if (mwave_3780i_irq) {
            for (i = 0; i < numDspIrqs; i++) {
                  if (mwave_3780i_irq == ausDspIrqs[i])
                        break;
            }
            if (i == numDspIrqs) {
                  PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_set_DSP_cfg: Error: Invalid mwave_3780i_irq %x. Aborting.\n", mwave_3780i_irq);
                  return bRC;
            }
      }

      if (mwave_uart_io) {
            for (i = 0; i < numUartBases; i++) {
                  if (mwave_uart_io == ausUartBases[i])
                        break;
            }
            if (i == numUartBases) {
                  PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_set_DSP_cfg: Error: Invalid mwave_uart_io address %x. Aborting.\n", mwave_uart_io);
                  return bRC;
            }
            uartio_index = i;
      }


      if (mwave_uart_irq) {
            for (i = 0; i < numUartIrqs; i++) {
                  if (mwave_uart_irq == ausUartIrqs[i])
                        break;
            }
            if (i == numUartIrqs) {
                  PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_set_DSP_cfg: Error: Invalid mwave_uart_irq %x. Aborting.\n", mwave_uart_irq);
                  return bRC;
            }
      }

      if (mwave_uart_irq || mwave_uart_io) {

            /* Check serial port A */
            bRC = smapi_request(0x1402, 0x0000, 0, 0,
                  &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
            if (bRC) goto exit_smapi_request_error;
            /* bRC == 0 */
            if (usBX & 0x0100) {    /* serial port A is present */
                  if (usCX & 1) {   /* serial port is enabled */
                        if ((usSI & 0xFF) == mwave_uart_irq) {
#ifndef MWAVE_FUTZ_WITH_OTHER_DEVICES
                              PRINTK_ERROR(KERN_ERR_MWAVE
                                    "smapi::smapi_set_DSP_cfg: Serial port A irq %x conflicts with mwave_uart_irq %x\n", usSI & 0xFF, mwave_uart_irq);
#else
                              PRINTK_3(TRACE_SMAPI,
                                    "smapi::smapi_set_DSP_cfg: Serial port A irq %x conflicts with mwave_uart_irq %x\n", usSI & 0xFF, mwave_uart_irq);
#endif
#ifdef MWAVE_FUTZ_WITH_OTHER_DEVICES
                              PRINTK_1(TRACE_SMAPI,
                                    "smapi::smapi_set_DSP_cfg Disabling conflicting serial port\n");
                              bRC = smapi_request(0x1403, 0x0100, 0, usSI,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
                              bRC = smapi_request(0x1402, 0x0000, 0, 0,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
#else
                              goto exit_conflict;
#endif
                        } else {
                              if ((usSI >> 8) == uartio_index) {
#ifndef MWAVE_FUTZ_WITH_OTHER_DEVICES
                                    PRINTK_ERROR(KERN_ERR_MWAVE
                                          "smapi::smapi_set_DSP_cfg: Serial port A base I/O address %x conflicts with mwave uart I/O %x\n", ausUartBases[usSI >> 8], ausUartBases[uartio_index]);
#else
                                    PRINTK_3(TRACE_SMAPI,
                                          "smapi::smapi_set_DSP_cfg: Serial port A base I/O address %x conflicts with mwave uart I/O %x\n", ausUartBases[usSI >> 8], ausUartBases[uartio_index]);
#endif
#ifdef MWAVE_FUTZ_WITH_OTHER_DEVICES
                                    PRINTK_1(TRACE_SMAPI,
                                          "smapi::smapi_set_DSP_cfg Disabling conflicting serial port A\n");
                                    bRC = smapi_request (0x1403, 0x0100, 0, usSI,
                                          &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                                    if (bRC) goto exit_smapi_request_error;
                                    bRC = smapi_request (0x1402, 0x0000, 0, 0,
                                          &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                                    if (bRC) goto exit_smapi_request_error;
#else
                                    goto exit_conflict;
#endif
                              }
                        }
                  }
            }

            /* Check serial port B */
            bRC = smapi_request(0x1404, 0x0000, 0, 0,
                  &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
            if (bRC) goto exit_smapi_request_error;
            /* bRC == 0 */
            if (usBX & 0x0100) {    /* serial port B is present */
                  if (usCX & 1) {   /* serial port is enabled */
                        if ((usSI & 0xFF) == mwave_uart_irq) {
#ifndef MWAVE_FUTZ_WITH_OTHER_DEVICES
                              PRINTK_ERROR(KERN_ERR_MWAVE
                                    "smapi::smapi_set_DSP_cfg: Serial port B irq %x conflicts with mwave_uart_irq %x\n", usSI & 0xFF, mwave_uart_irq);
#else
                              PRINTK_3(TRACE_SMAPI,
                                    "smapi::smapi_set_DSP_cfg: Serial port B irq %x conflicts with mwave_uart_irq %x\n", usSI & 0xFF, mwave_uart_irq);
#endif
#ifdef MWAVE_FUTZ_WITH_OTHER_DEVICES
                              PRINTK_1(TRACE_SMAPI,
                                    "smapi::smapi_set_DSP_cfg Disabling conflicting serial port B\n");
                              bRC = smapi_request(0x1405, 0x0100, 0, usSI,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
                              bRC = smapi_request(0x1404, 0x0000, 0, 0,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
#else
                              goto exit_conflict;
#endif
                        } else {
                              if ((usSI >> 8) == uartio_index) {
#ifndef MWAVE_FUTZ_WITH_OTHER_DEVICES
                                    PRINTK_ERROR(KERN_ERR_MWAVE
                                          "smapi::smapi_set_DSP_cfg: Serial port B base I/O address %x conflicts with mwave uart I/O %x\n", ausUartBases[usSI >> 8], ausUartBases[uartio_index]);
#else
                                    PRINTK_3(TRACE_SMAPI,
                                          "smapi::smapi_set_DSP_cfg: Serial port B base I/O address %x conflicts with mwave uart I/O %x\n", ausUartBases[usSI >> 8], ausUartBases[uartio_index]);
#endif
#ifdef MWAVE_FUTZ_WITH_OTHER_DEVICES
                                    PRINTK_1 (TRACE_SMAPI,
                                        "smapi::smapi_set_DSP_cfg Disabling conflicting serial port B\n");
                                    bRC = smapi_request (0x1405, 0x0100, 0, usSI,
                                          &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                                    if (bRC) goto exit_smapi_request_error;
                                    bRC = smapi_request (0x1404, 0x0000, 0, 0,
                                          &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                                    if (bRC) goto exit_smapi_request_error;
#else
                                    goto exit_conflict;
#endif
                              }
                        }
                  }
            }

            /* Check IR port */
            bRC = smapi_request(0x1700, 0x0000, 0, 0,
                  &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
            if (bRC) goto exit_smapi_request_error;
            bRC = smapi_request(0x1704, 0x0000, 0, 0,
                  &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
            if (bRC) goto exit_smapi_request_error;
            /* bRC == 0 */
            if ((usCX & 0xff) != 0xff) { /* IR port not disabled */
                  if ((usCX & 0xff) == mwave_uart_irq) {
#ifndef MWAVE_FUTZ_WITH_OTHER_DEVICES
                        PRINTK_ERROR(KERN_ERR_MWAVE
                              "smapi::smapi_set_DSP_cfg: IR port irq %x conflicts with mwave_uart_irq %x\n", usCX & 0xff, mwave_uart_irq);
#else
                        PRINTK_3(TRACE_SMAPI,
                              "smapi::smapi_set_DSP_cfg: IR port irq %x conflicts with mwave_uart_irq %x\n", usCX & 0xff, mwave_uart_irq);
#endif
#ifdef MWAVE_FUTZ_WITH_OTHER_DEVICES
                        PRINTK_1(TRACE_SMAPI,
                              "smapi::smapi_set_DSP_cfg Disabling conflicting IR port\n");
                        bRC = smapi_request(0x1701, 0x0100, 0, 0,
                              &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                        if (bRC) goto exit_smapi_request_error;
                        bRC = smapi_request(0x1700, 0, 0, 0,
                              &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                        if (bRC) goto exit_smapi_request_error;
                        bRC = smapi_request(0x1705, 0x01ff, 0, usSI,
                              &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                        if (bRC) goto exit_smapi_request_error;
                        bRC = smapi_request(0x1704, 0x0000, 0, 0,
                              &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                        if (bRC) goto exit_smapi_request_error;
#else
                        goto exit_conflict;
#endif
                  } else {
                        if ((usSI & 0xff) == uartio_index) {
#ifndef MWAVE_FUTZ_WITH_OTHER_DEVICES
                              PRINTK_ERROR(KERN_ERR_MWAVE
                                    "smapi::smapi_set_DSP_cfg: IR port base I/O address %x conflicts with mwave uart I/O %x\n", ausUartBases[usSI & 0xff], ausUartBases[uartio_index]);
#else
                              PRINTK_3(TRACE_SMAPI,
                                    "smapi::smapi_set_DSP_cfg: IR port base I/O address %x conflicts with mwave uart I/O %x\n", ausUartBases[usSI & 0xff], ausUartBases[uartio_index]);
#endif
#ifdef MWAVE_FUTZ_WITH_OTHER_DEVICES
                              PRINTK_1(TRACE_SMAPI,
                                    "smapi::smapi_set_DSP_cfg Disabling conflicting IR port\n");
                              bRC = smapi_request(0x1701, 0x0100, 0, 0,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
                              bRC = smapi_request(0x1700, 0, 0, 0,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
                              bRC = smapi_request(0x1705, 0x01ff, 0, usSI,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
                              bRC = smapi_request(0x1704, 0x0000, 0, 0,
                                    &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
                              if (bRC) goto exit_smapi_request_error;
#else
                              goto exit_conflict;
#endif
                        }
                  }
            }
      }

      bRC = smapi_request(0x1802, 0x0000, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) goto exit_smapi_request_error;

      if (mwave_3780i_io) {
            usDI = dspio_index;
      }
      if (mwave_3780i_irq) {
            usSI = (usSI & 0xff00) | mwave_3780i_irq;
      }

      bRC = smapi_request(0x1803, 0x0101, usDI, usSI,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) goto exit_smapi_request_error;

      bRC = smapi_request(0x1804, 0x0000, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) goto exit_smapi_request_error;

      if (mwave_uart_io) {
            usSI = (usSI & 0x00ff) | (uartio_index << 8);
      }
      if (mwave_uart_irq) {
            usSI = (usSI & 0xff00) | mwave_uart_irq;
      }
      bRC = smapi_request(0x1805, 0x0101, 0, usSI,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) goto exit_smapi_request_error;

      bRC = smapi_request(0x1802, 0x0000, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) goto exit_smapi_request_error;

      bRC = smapi_request(0x1804, 0x0000, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);
      if (bRC) goto exit_smapi_request_error;

/* normal exit: */
      PRINTK_1(TRACE_SMAPI, "smapi::smapi_set_DSP_cfg exit\n");
      return 0;

exit_conflict:
      /* Message has already been printed */
      return -EIO;

exit_smapi_request_error:
      PRINTK_ERROR(KERN_ERR_MWAVE "smapi::smapi_set_DSP_cfg exit on smapi_request error bRC %x\n", bRC);
      return bRC;
}


int smapi_set_DSP_power_state(BOOLEAN bOn)
{
      int bRC = -EIO;
      unsigned short usAX, usBX, usCX, usDX, usDI, usSI;
      unsigned short usPowerFunction;

      PRINTK_2(TRACE_SMAPI, "smapi::smapi_set_DSP_power_state entry bOn %x\n", bOn);

      usPowerFunction = (bOn) ? 1 : 0;

      bRC = smapi_request(0x4901, 0x0000, 0, usPowerFunction,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);

      PRINTK_2(TRACE_SMAPI, "smapi::smapi_set_DSP_power_state exit bRC %x\n", bRC);

      return bRC;
}

#if 0
static int SmapiQuerySystemID(void)
{
      int bRC = -EIO;
      unsigned short usAX = 0xffff, usBX = 0xffff, usCX = 0xffff,
            usDX = 0xffff, usDI = 0xffff, usSI = 0xffff;

      printk("smapi::SmapiQUerySystemID entry\n");
      bRC = smapi_request(0x0000, 0, 0, 0,
            &usAX, &usBX, &usCX, &usDX, &usDI, &usSI);

      if (bRC == 0) {
            printk("AX=%x, BX=%x, CX=%x, DX=%x, DI=%x, SI=%x\n",
                  usAX, usBX, usCX, usDX, usDI, usSI);
      } else {
            printk("smapi::SmapiQuerySystemID smapi_request error\n");
      }

      return bRC;
}
#endif  /*  0  */

int smapi_init(void)
{
      int retval = -EIO;
      unsigned short usSmapiID = 0;
      unsigned long flags;

      PRINTK_1(TRACE_SMAPI, "smapi::smapi_init entry\n");

      spin_lock_irqsave(&rtc_lock, flags);
      usSmapiID = CMOS_READ(0x7C);
      usSmapiID |= (CMOS_READ(0x7D) << 8);
      spin_unlock_irqrestore(&rtc_lock, flags);
      PRINTK_2(TRACE_SMAPI, "smapi::smapi_init usSmapiID %x\n", usSmapiID);

      if (usSmapiID == 0x5349) {
            spin_lock_irqsave(&rtc_lock, flags);
            g_usSmapiPort = CMOS_READ(0x7E);
            g_usSmapiPort |= (CMOS_READ(0x7F) << 8);
            spin_unlock_irqrestore(&rtc_lock, flags);
            if (g_usSmapiPort == 0) {
                  PRINTK_ERROR("smapi::smapi_init, ERROR unable to read from SMAPI port\n");
            } else {
                  PRINTK_2(TRACE_SMAPI,
                        "smapi::smapi_init, exit TRUE g_usSmapiPort %x\n",
                        g_usSmapiPort);
                  retval = 0;
                  //SmapiQuerySystemID();
            }
      } else {
            PRINTK_ERROR("smapi::smapi_init, ERROR invalid usSmapiID\n");
            retval = -ENXIO;
      }

      return retval;
}

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