sane-project-backends/backend/plustek-pp_misc.c

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/*.............................................................................
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* Project : SANE library for Plustek parallelport flatbed scanners.
*.............................................................................
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*/
/* @file plustek-pp_misc.c
* @brief here we have some helpful functions
*
* based on sources acquired from Plustek Inc.
* Copyright (C) 1998 Plustek Inc.
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* Copyright (C) 2000-2004 Gerhard Jaeger <gerhard@gjaeger.de>
* also based on the work done by Rick Bronson
*
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* History:
* - 0.30 - initial version
* - 0.31 - no changes
* - 0.32 - moved the parport functions inside this module
* - now using the information, the parport-driver provides
* - for selecting the port-mode this driver uses
* - 0.33 - added code to use faster portmodes
* - 0.34 - added sample code for changing from ECP to PS/2 bidi mode
* - 0.35 - added Kevins' changes (new function miscSetFastMode())
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* - moved function initPageSettings() to module models.c
* - 0.36 - added random generator
* - added additional debug messages
* - changed prototype of MiscInitPorts()
* - added miscPreemptionCallback()
* - 0.37 - changed inb_p/outb_p to macro calls (kernel-mode)
* - added MiscGetModelName()
* - added miscShowPortModes()
* - 0.38 - fixed a small bug in MiscGetModelName()
* - 0.39 - added forceMode support
* - 0.40 - no changes
* - 0.41 - merged Kevins' patch to make EPP(ECP) work
* - 0.42 - changed get_fast_time to _GET_TIME
* - changed include names
* .
* <hr>
* This file is part of the SANE package.
*
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* 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.
*
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* 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
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
* As a special exception, the authors of SANE give permission for
* additional uses of the libraries contained in this release of SANE.
*
* The exception is that, if you link a SANE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. Your use of that executable is in no way restricted on
* account of linking the SANE library code into it.
*
* This exception does not, however, invalidate any other reasons why
* the executable file might be covered by the GNU General Public
* License.
*
* If you submit changes to SANE to the maintainers to be included in
* a subsequent release, you agree by submitting the changes that
* those changes may be distributed with this exception intact.
*
* If you write modifications of your own for SANE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
* <hr>
*/
#include "plustek-pp_scan.h"
/*************************** some definitions ********************************/
#ifndef __KERNEL__
# define PPA_PROBE_SPP 0x0001
# define PPA_PROBE_PS2 0x0002
# define PPA_PROBE_ECR 0x0010
# define PPA_PROBE_EPP17 0x0100
# define PPA_PROBE_EPP19 0x0200
#else
/*
* the parport driver in Kernel 2.4 has changed. It does report the
* possible modes in a different, more general way. As long, as
* we do not use the parport-module change mode facility, I assume
* the following correlations
*/
#if defined LINUX_24 || defined LINUX_26
# define PARPORT_MODE_PCPS2 PARPORT_MODE_TRISTATE
# define PARPORT_MODE_PCEPP PARPORT_MODE_EPP
# define PARPORT_MODE_PCECPPS2 PARPORT_MODE_TRISTATE
# define PARPORT_MODE_PCECPEPP PARPORT_MODE_EPP
# define PARPORT_MODE_PCECR PARPORT_MODE_ECP
#endif
#endif
#define _A 16807 /* multiplier */
#define _M 2147483647L /* 2**31 - 1 */
#define _Q 127773L /* m div a */
#define _R 2836 /* m mod a */
/*************************** some local vars *********************************/
static int port_feature = 0;
static long randomnum = 1;
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#ifdef __KERNEL__
static int portIsClaimed[_MAX_PTDEVS] = { [0 ... (_MAX_PTDEVS-1)] = 0 };
MODELSTR; /**< a static char array (see plustek-pp.h) */
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#else
static int portIsClaimed[_MAX_PTDEVS] = { 0, 0, 0, 0 };
#endif
/*************************** local functions *********************************/
#ifdef __KERNEL__
/** display the avaialable port-modes
*/
#ifdef DEBUG
static void miscShowPortModes( int modes )
{
DBG( DBG_LOW, "parport-modi:" );
if( modes & PARPORT_MODE_PCSPP )
DBG( DBG_LOW, " SPP" );
if( modes & PARPORT_MODE_PCPS2 )
DBG( DBG_LOW, " PS/2" );
if( modes & PARPORT_MODE_PCEPP )
DBG( DBG_LOW, " EPP" );
if( modes & PARPORT_MODE_PCECR )
DBG( DBG_LOW, " ECP" );
if( modes & PARPORT_MODE_PCECPEPP )
DBG( DBG_LOW, " EPP(ECP)" );
if( modes & PARPORT_MODE_PCECPPS2 )
DBG( DBG_LOW, " PS/2(ECP)" );
DBG( DBG_LOW, "\n" );
}
#endif
/** probe the parallel port
*/
static int initPortProbe( pScanData ps )
{
int retv = 0;
/* clear the controls */
ps->IO.lastPortMode = 0xFFFF;
if( NULL != ps->pardev )
retv = ps->pardev->port->modes;
return retv;
}
/** will be called by the parport module when we already have access, but
* another module wants access to the port...
*/
static int miscPreemptionCallback( pVoid data )
{
pScanData ps = (pScanData)data;
if( NULL != ps ) {
/* never release during scanning */
if( ps->DataInf.dwScanFlag & _SCANNER_SCANNING ) {
DBG( DBG_LOW, "no way!!!\n" );
return 1;
}
}
/* let the port go...*/
return 0;
}
/** depending on the reported possible port modes, we try to set a faster mode
* than SPP
*/
static int miscSetFastMode( pScanData ps )
{
UChar a, b;
/*
* when previously found the EPP mode, break right here
*/
if (( _PORT_EPP == ps->IO.portMode ) && (!(port_feature & PARPORT_MODE_PCECR)))
return _OK;
/* CHECK REMOVE: from here we should have SPP (Paranoia Code !) */
if (( _PORT_SPP != ps->IO.portMode ) && (!(port_feature & PARPORT_MODE_PCECR)))
return _OK;
DBG(DBG_LOW, "Trying faster mode...\n" );
/*
* ECP mode usually has sub-modes of EPP and/or PS2.
* First we try to set EPP
*/
if((port_feature & PARPORT_MODE_PCECR) &&
(port_feature & PARPORT_MODE_PCECPEPP)){
DBG(DBG_LOW, "Attempting to set EPP from ECP mode.\n" );
a = _INB_ECTL(ps); /* get current ECR */
ps->IO.lastPortMode = a; /* save it for restoring later */
a = (a & 0x1F) | 0x80; /* set to EPP */
_OUTB_ECTL(ps, a); /* write it back */
_DO_UDELAY(1);
/*
* It is probably unnecessary to
* do this check but it makes me feel better
*/
b = _INB_ECTL(ps); /* check to see if port set */
if( a == b ) {
DBG( DBG_LOW, "Port is set to (ECP) EPP mode.\n" );
ps->IO.portMode = _PORT_EPP;
return _OK;
} else {
DBG( DBG_LOW, "Port could not be set to (ECP) EPP mode. "
"Using SPP mode.\n" );
_OUTB_ECTL(ps,(Byte)ps->IO.lastPortMode); /* restore */
_DO_UDELAY(1);
ps->IO.portMode = _PORT_SPP;
/* go ahead and try with other settings...*/
}
}
/* If port cannot be set to EPP, try PS2 */
if((port_feature & PARPORT_MODE_PCECR) &&
(port_feature & PARPORT_MODE_PCECPPS2)) {
DBG(DBG_LOW, "Attempting to set PS2 from ECPPS2 mode.\n" );
a = _INB_ECTL(ps); /* get current ECR */
ps->IO.lastPortMode = a; /* save it for restoring later */
/* set to Fast Centronics/bi-directional/PS2 */
a = (a & 0x1F) | 0x20;
_OUTB_ECTL(ps,a); /* write it back */
_DO_UDELAY(1);
/*
* It is probably unnecessary to do this check
* but it makes me feel better
*/
b = _INB_ECTL(ps); /* check to see if port set */
if (a == b) {
DBG(DBG_LOW, "Port is set to (ECP) PS2 bidirectional mode.\n");
ps->IO.portMode = _PORT_BIDI;
return _OK;
} else {
DBG(DBG_LOW, "Port could not be set to (ECP) PS2 mode. "
"Using SPP mode.\n");
a = ps->IO.lastPortMode & 0x1F;
_OUTB_ECTL(ps, a); /* set ECP ctrl to SPP */
_DO_UDELAY(1);
ps->IO.portMode = _PORT_SPP;
/* next mode, last attempt... */
}
}
/*
* Some BIOS/cards have only a Bi-directional/PS2 mode (no EPP).
* Make one last attemp to set to PS2 mode.
*/
if ( port_feature & PARPORT_MODE_PCPS2 ){
DBG(DBG_LOW, "Attempting to set PS2 mode.\n" );
a = _INB_CTRL(ps); /* get current setting of control register*/
ps->IO.lastPortMode = a; /* save it for restoring later */
a = a | 0x20; /* set bit 5 of control reg */
_OUTB_CTRL(ps,a); /* set to Fast Centronics/bi-directional/PS2 */
_DO_UDELAY(1);
a = 0;
_OUTB_DATA(ps,0x55);
_DO_UDELAY(1);
if ((inb(ps->IO.portBase)) != 0x55) /* read data */
a++;
_OUTB_DATA(ps,0xAA);
_DO_UDELAY(1);
if (_INB_DATA(ps) != 0xAA) /* read data */
a++;
if( 2 == a ) {
DBG(DBG_LOW, "Port is set to PS2 bidirectional mode.\n");
ps->IO.portMode = _PORT_BIDI;
return _OK;
} else {
DBG(DBG_LOW, "Port could not be set to PS2 mode. "
"Using SPP mode.\n");
_OUTB_CTRL(ps,(Byte)ps->IO.lastPortMode); /* restore */
_DO_UDELAY(1);
ps->IO.portMode = _PORT_SPP;
}
}
/* reaching this point, we're back in SPP mode and there's no need
* to restore at shutdown...
*/
ps->IO.lastPortMode = 0xFFFF;
return _OK;
}
/** check the state of the par-port and switch to EPP-mode if possible
*/
static int miscSetPortMode( pScanData ps )
{
/* try to detect the port settings, SPP seems to work in any case ! */
port_feature = initPortProbe( ps );
#ifdef DEBUG
miscShowPortModes( port_feature );
#endif
switch( ps->IO.forceMode ) {
case 1:
DBG( DBG_LOW, "Use of SPP-mode enforced\n" );
ps->IO.portMode = _PORT_SPP;
return _OK;
break;
case 2:
DBG( DBG_LOW, "Use of EPP-mode enforced\n" );
ps->IO.portMode = _PORT_EPP;
return _OK;
break;
default:
break;
}
if( !(port_feature & PARPORT_MODE_PCEPP)) {
if( !(port_feature & PARPORT_MODE_PCSPP )) {
_PRINT("\nThis Port supports not the SPP- or EPP-Mode\n" );
_PRINT("Please activate SPP-Mode, EPP-Mode or\nEPP + ECP-Mode!\n");
return _E_NOSUPP;
} else {
DBG(DBG_LOW, "Using SPP-mode\n" );
ps->IO.portMode = _PORT_SPP;
}
} else {
DBG(DBG_LOW, "Using EPP-mode\n" );
ps->IO.portMode = _PORT_EPP;
}
/* else try to set to a faster mode than SPP */
return miscSetFastMode( ps );
}
#endif
/** miscNextLongRand() -- generate 2**31-2 random numbers
**
** public domain by Ray Gardner
**
** based on "Random Number Generators: Good Ones Are Hard to Find",
** S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988),
** and "Two Fast Implementations of the 'Minimal Standard' Random
** Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), p. 87-88
**
** linear congruential generator f(z) = 16807 z mod (2 ** 31 - 1)
**
** uses L. Schrage's method to avoid overflow problems
*/
static Long miscNextLongRand( Long seed )
{
ULong lo, hi;
lo = _A * (Long)(seed & 0xFFFF);
hi = _A * (Long)((ULong)seed >> 16);
lo += (hi & 0x7FFF) << 16;
if (lo > _M) {
lo &= _M;
++lo;
}
lo += hi >> 15;
if (lo > _M) {
lo &= _M;
++lo;
}
return (Long)lo;
}
/** initialize the random number generator
*/
static void miscSeedLongRand( ULong seed )
{
randomnum = seed ? (seed & _M) : 1; /* nonzero seed */
}
/************************ exported functions *********************************/
/** allocate and initialize some memory for the scanner structure
*/
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_LOC pScanData MiscAllocAndInitStruct( void )
{
pScanData ps;
ps = (pScanData)_KALLOC(sizeof(ScanData), GFP_KERNEL);
if( NULL != ps ) {
MiscReinitStruct( ps );
}
DBG( DBG_HIGH, "ScanData = 0x%08lx\n", (ULong)ps );
return ps;
}
/** re-initialize the memory for the scanner structure
*/
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_LOC int MiscReinitStruct( pScanData ps )
{
if( NULL == ps )
return _E_NULLPTR;
memset( ps, 0, sizeof(ScanData));
/*
* first init all constant stuff in ScanData
*/
ps->sCaps.Version = ((_PTDRV_V1 << 8) | _PTDRV_V0);
ps->bCurrentSpeed = 1;
ps->pbMapRed = ps->a_bMapTable;
ps->pbMapGreen = &ps->a_bMapTable[256];
ps->pbMapBlue = &ps->a_bMapTable[512];
ps->sCaps.wIOBase = _NO_BASE;
/* use memory address to seed the generator */
miscSeedLongRand((Long)ps);
DBG( DBG_HIGH, "Init settings done\n" );
return _OK;
}
/** in USER-Mode: probe the specified port and try to get the port-mode
* in KERNEL-Mode: only use the modes, the driver returns
*/
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_LOC int MiscInitPorts( pScanData ps, int port )
{
#ifdef __KERNEL__
int status;
if( NULL == ps )
return _E_NULLPTR;
/*
* Get access to the ports
*/
ps->IO.portBase = (UShort)port;
status = miscSetPortMode(ps);
if( _OK != status ) {
ps->sCaps.wIOBase = _NO_BASE;
ps->IO.portBase = _NO_BASE;
return status;
}
/*
* the port settings
*/
ps->IO.pbSppDataPort = (UShort)port;
ps->IO.pbStatusPort = (UShort)port+1;
ps->IO.pbControlPort = (UShort)port+2;
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ps->IO.pbEppDataPort = (UShort)port+4;
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#else
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int mode, mts;
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if( NULL == ps )
return _E_NULLPTR;
if( SANE_STATUS_GOOD != sanei_pp_getmodes( ps->pardev, &mode )) {
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DBG( DBG_HIGH, "Cannot get port mode!\n" );
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return _E_NO_PORT;
}
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ps->IO.portMode = _PORT_NONE;
mts = -1;
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if( mode & SANEI_PP_MODE_SPP ) {
DBG( DBG_LOW, "Setting SPP-mode\n" );
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ps->IO.portMode = _PORT_SPP;
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mts = SANEI_PP_MODE_SPP;
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}
if( mode & SANEI_PP_MODE_BIDI ) {
DBG( DBG_LOW, "Setting PS/2-mode\n" );
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ps->IO.portMode = _PORT_BIDI;
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mts = SANEI_PP_MODE_BIDI;
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}
if( mode & SANEI_PP_MODE_EPP ) {
DBG( DBG_LOW, "Setting EPP-mode\n" );
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ps->IO.portMode = _PORT_EPP;
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mts = SANEI_PP_MODE_EPP;
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}
if( mode & SANEI_PP_MODE_ECP ) {
DBG( DBG_HIGH, "ECP detected --> not supported\n" );
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}
if( sanei_pp_uses_directio()) {
DBG( DBG_LOW, "We're using direct I/O\n" );
} else {
DBG( DBG_LOW, "We're using libIEEE1284 I/O\n" );
}
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if( ps->IO.portMode == _PORT_NONE ) {
DBG( DBG_HIGH, "None of the portmodes is supported.\n" );
return _E_NOSUPP;
}
sanei_pp_setmode( ps->pardev, mts );
_VAR_NOT_USED( port );
#endif
return _OK;
}
/** Function to restore the port
*/
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_LOC void MiscRestorePort( pScanData ps )
{
#ifdef __KERNEL__
if( 0 == ps->IO.pbSppDataPort )
return;
#endif
DBG(DBG_LOW,"MiscRestorePort()\n");
/* don't restore if not necessary */
if( 0xFFFF == ps->IO.lastPortMode ) {
DBG(DBG_LOW,"- no need to restore portmode !\n");
return;
}
/*Restore Port-Mode*/
#ifdef __KERNEL__
if( port_feature & PARPORT_MODE_PCECR ){
_OUTB_ECTL( ps, (Byte)ps->IO.lastPortMode );
_DO_UDELAY(1);
} else {
_OUTB_CTRL( ps, (Byte)ps->IO.lastPortMode );
_DO_UDELAY(1);
}
#else
if( port_feature & PPA_PROBE_ECR ){
_OUTB_ECTL(ps,ps->IO.lastPortMode);
}
#endif
}
/** Initializes a timer.
* @param timer - pointer to the timer to start
* @param us - timeout value in micro-seconds
*/
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_LOC _INL void MiscStartTimer( pTimerDef timer , unsigned long us)
{
struct timeval start_time;
#ifdef __KERNEL__
_GET_TIME( &start_time );
#else
gettimeofday(&start_time, NULL);
#endif
*timer = start_time.tv_sec * 1e6 + start_time.tv_usec + us;
}
/** Checks if a timer has been expired or not. In Kernel-mode, the scheduler
* will also be triggered, if the timer has not been expired.
* @param timer - pointer to the timer to check
* @return Function returns _E_TIMEOUT when the timer has been expired,
* otherwise _OK;
*/
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_LOC _INL int MiscCheckTimer( pTimerDef timer )
{
struct timeval current_time;
#ifdef __KERNEL__
_GET_TIME( &current_time );
#else
gettimeofday(&current_time, NULL);
#endif
if (current_time.tv_sec * 1e6 + current_time.tv_usec > *timer) {
return _E_TIMEOUT;
} else {
#ifdef __KERNEL__
schedule();
/*#else
sched_yield();
*/
#endif
return _OK;
}
}
/** Checks the function pointers
* @param ps - pointer to the scanner data structure.
* @return Function returns _TRUE if everything is okay and _FALSE if a NULL
* ptr has been detected.
*/
#ifdef DEBUG
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_LOC Bool MiscAllPointersSet( pScanData ps )
{
ULong i;
pULong ptr;
for( ptr = (pULong)&ps->OpenScanPath, i = 1;
ptr <= (pULong)&ps->ReadOneImageLine; ptr++, i++ ) {
if( NULL == (pVoid)*ptr ) {
DBG( DBG_HIGH, "Function pointer not set (pos = %lu) !\n", i );
return _FALSE;
}
}
return _TRUE;
}
#endif
/** registers this driver to use port "portAddr" (KERNEL-Mode only)
* @param ps - pointer to the scanner data structure.
* @param portAddr -
*/
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_LOC int MiscRegisterPort( pScanData ps, int portAddr )
{
#ifndef __KERNEL__
DBG( DBG_LOW, "Assigning port handle %i\n", portAddr );
ps->pardev = portAddr;
#else
struct parport *pp;
DBG( DBG_LOW, "Requested port at 0x%02x\n", portAddr );
pp = parport_enumerate();
ps->pardev = NULL;
if( NULL == pp ) {
return _E_PORTSEARCH;
}
/* go through the list
*/
for( ps->pp = NULL; NULL != pp; ) {
if( pp->base == (unsigned long)portAddr ) {
DBG( DBG_LOW, "Requested port (0x%02x) found\n", portAddr );
DBG( DBG_LOW, "Port mode reported: (0x%04x)\n", pp->modes );
ps->pp = pp;
break;
}
pp = pp->next;
}
if( NULL == ps->pp ) {
return _E_NO_PORT;
}
/*
* register this device
*/
ps->pardev = parport_register_device( ps->pp, "Plustek Driver",
miscPreemptionCallback, NULL, NULL, 0, (pVoid)ps );
if( NULL == ps->pardev ) {
return _E_REGISTER;
}
DBG( DBG_LOW, "Port for device %lu registered\n", ps->devno );
#endif
portIsClaimed[ps->devno] = 0;
return _OK;
}
/** unregisters the port from driver
*/
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_LOC void MiscUnregisterPort( pScanData ps )
{
#ifdef __KERNEL__
if( NULL != ps->pardev ) {
DBG( DBG_LOW, "Port unregistered\n" );
parport_unregister_device( ps->pardev );
}
#else
sanei_pp_close( ps->pardev );
#endif
}
/** Try to claim the port
* @param ps - pointer to the scanner data structure.
* @return Function returns _OK on success, otherwise _E_BUSY.
*/
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_LOC int MiscClaimPort( pScanData ps )
{
if( 0 == portIsClaimed[ps->devno] ) {
DBG( DBG_HIGH, "Try to claim the parport\n" );
#ifdef __KERNEL__
if( 0 != parport_claim( ps->pardev )) {
#else
if( SANE_STATUS_GOOD != sanei_pp_claim( ps->pardev )) {
#endif
return _E_BUSY;
}
}
portIsClaimed[ps->devno]++;
return _OK;
}
/** Release previously claimed port
* @param ps - pointer to the scanner data structure
*/
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_LOC void MiscReleasePort( pScanData ps )
{
if( portIsClaimed[ps->devno] > 0 ) {
portIsClaimed[ps->devno]--;
if( 0 == portIsClaimed[ps->devno] ) {
DBG( DBG_HIGH, "Releasing parport\n" );
#ifdef __KERNEL__
parport_release( ps->pardev );
#else
sanei_pp_release( ps->pardev );
#endif
}
}
}
/** Get random number
* @return a random number.
*/
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_LOC Long MiscLongRand( void )
{
randomnum = miscNextLongRand( randomnum );
return randomnum;
}
/** According to the id, the function returns a pointer to the model name
* @param id - internal id of the various scanner models.
* @return a pointer to the model-string.
*/
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_LOC const char *MiscGetModelName( UShort id )
{
DBG( DBG_HIGH, "MiscGetModelName - id = %i\n", id );
if( MODEL_OP_PT12 < id )
return ModelStr[0];
return ModelStr[id];
}
/* END PLUSTEK-PP_MISC.C ....................................................*/