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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.
+ * Copyright (C) 2000-2013 Gerhard Jaeger <gerhard@gjaeger.de>
+ * also based on the work done by Rick Bronson
+ *
+ * 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())
+ * - 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
+ * - 0.43 - added LINUX_26 stuff
+ * - minor fixes
+ * - removed floating point stuff
+ * - 0.44 - fix format string issues, as Long types default to int32_t
+ * now
+ * .
+ * <hr>
+ * This file is part of the SANE package.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * 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 _PP_A 16807 /**< multiplier */
+#define _PP_M 2147483647L /**< 2**31 - 1 */
+
+/*************************** some local vars *********************************/
+
+static int port_feature = 0;
+static long randomnum = 1;
+
+#ifdef __KERNEL__
+static int portIsClaimed[_MAX_PTDEVS] = { [0 ... (_MAX_PTDEVS-1)] = 0 };
+
+MODELSTR; /**< a static char array (see plustek-pp.h) */
+
+#else
+static int portIsClaimed[_MAX_PTDEVS] = { 0, 0, 0, 0 };
+#endif
+
+/*************************** local functions *********************************/
+
+#ifdef __KERNEL__
+#ifdef LINUX_26
+
+static pScanData __ps = NULL;
+static int __pa = -1;
+
+/** callback from parport driver
+ */
+static void misc_attach(struct parport *port)
+{
+ DBG( DBG_LOW, "misc_attach\n" );
+
+ __ps->pp = NULL;
+ if( port->base == (unsigned long)__pa ) {
+ DBG( DBG_LOW, "Requested port (0x%02x) found\n", __pa );
+ DBG( DBG_LOW, "Port mode reported: (0x%04x)\n", port->modes );
+ __ps->pp = port;
+ }
+}
+
+static void misc_detach( struct parport *port )
+{
+ DBG( DBG_LOW, "misc_detach\n" );
+}
+
+static struct parport_driver pt_drv = {
+ .name = "pt_drv",
+ .attach = misc_attach,
+ .detach = misc_detach,
+};
+#endif
+
+/** 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 = _PP_A * (Long)(seed & 0xFFFF);
+ hi = _PP_A * (Long)((ULong)seed >> 16);
+ lo += (hi & 0x7FFF) << 16;
+ if (lo > _PP_M) {
+
+ lo &= _PP_M;
+ ++lo;
+ }
+ lo += hi >> 15;
+ if (lo > _PP_M) {
+ lo &= _PP_M;
+ ++lo;
+ }
+
+ return (Long)lo;
+}
+
+/** initialize the random number generator
+ */
+static void miscSeedLongRand( long seed )
+{
+ randomnum = seed ? (seed & _PP_M) : 1; /* nonzero seed */
+}
+
+/************************ exported functions *********************************/
+
+/** allocate and initialize some memory for the scanner structure
+ */
+_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", (unsigned long)ps );
+ return ps;
+}
+
+/** re-initialize the memory for the scanner structure
+ */
+_LOC int MiscReinitStruct( pScanData ps )
+{
+ if( NULL == ps )
+ return _E_NULLPTR;
+
+ memset( ps, 0, sizeof(ScanData));
+
+ /* first init all constant stuff in ScanData
+ */
+ 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
+ */
+_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;
+ ps->IO.pbEppDataPort = (UShort)port+4;
+
+#else
+ int mode, mts;
+
+ if( NULL == ps )
+ return _E_NULLPTR;
+
+ if( SANE_STATUS_GOOD != sanei_pp_getmodes( ps->pardev, &mode )) {
+ DBG( DBG_HIGH, "Cannot get port mode!\n" );
+ return _E_NO_PORT;
+ }
+
+ ps->IO.portMode = _PORT_NONE;
+ mts = -1;
+ if( mode & SANEI_PP_MODE_SPP ) {
+ DBG( DBG_LOW, "Setting SPP-mode\n" );
+ ps->IO.portMode = _PORT_SPP;
+ mts = SANEI_PP_MODE_SPP;
+ }
+ if( mode & SANEI_PP_MODE_BIDI ) {
+ DBG( DBG_LOW, "Setting PS/2-mode\n" );
+ ps->IO.portMode = _PORT_BIDI;
+ mts = SANEI_PP_MODE_BIDI;
+ }
+ if( mode & SANEI_PP_MODE_EPP ) {
+ DBG( DBG_LOW, "Setting EPP-mode\n" );
+ ps->IO.portMode = _PORT_EPP;
+ mts = SANEI_PP_MODE_EPP;
+ }
+ if( mode & SANEI_PP_MODE_ECP ) {
+ DBG( DBG_HIGH, "ECP detected --> not supported\n" );
+ }
+
+ 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" );
+ }
+
+ 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
+ */
+_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
+ */
+_LOC void MiscStartTimer( TimerDef *timer , unsigned long us)
+{
+ struct timeval start_time;
+
+#ifdef __KERNEL__
+ _GET_TIME( &start_time );
+#else
+ gettimeofday(&start_time, NULL);
+#endif
+
+ *timer = (TimerDef)start_time.tv_sec * 1000000 + (TimerDef)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;
+ */
+_LOC int MiscCheckTimer( TimerDef *timer )
+{
+ struct timeval current_time;
+
+#ifdef __KERNEL__
+ _GET_TIME( &current_time );
+#else
+ gettimeofday(&current_time, NULL);
+#endif
+
+ if ((TimerDef)current_time.tv_sec * 1000000 + (TimerDef)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
+_LOC Bool MiscAllPointersSet( pScanData ps )
+{
+ int i;
+ unsigned long *ptr;
+
+ for( ptr = (unsigned long *)&ps->OpenScanPath, i = 1;
+ ptr <= (unsigned long *)&ps->ReadOneImageLine; ptr++, i++ ) {
+
+ if( NULL == (pVoid)*ptr ) {
+ DBG( DBG_HIGH, "Function pointer not set (pos = %d) !\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 -
+ */
+_LOC int MiscRegisterPort( pScanData ps, int portAddr )
+{
+#ifndef __KERNEL__
+ DBG( DBG_LOW, "Assigning port handle %i\n", portAddr );
+ ps->pardev = portAddr;
+#else
+
+#ifdef LINUX_26
+ __ps = ps;
+ __pa = portAddr;
+
+ DBG( DBG_LOW, "Requested port at 0x%02x\n", portAddr );
+
+ if( parport_register_driver(&pt_drv)) {
+ /* Failed; nothing we can do. */
+ return _E_REGISTER;
+ }
+
+#else
+ struct parport *pp = NULL;
+
+ 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;
+ }
+#endif
+
+ if( NULL == ps->pp ) {
+ printk("PORT not found!!!\n");
+ 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 %u registered\n", ps->devno );
+#endif
+
+ portIsClaimed[ps->devno] = 0;
+ return _OK;
+}
+
+/** unregisters the port from driver
+ */
+_LOC void MiscUnregisterPort( pScanData ps )
+{
+#ifdef __KERNEL__
+ if( NULL != ps->pardev ) {
+ DBG( DBG_LOW, "Port unregistered\n" );
+ parport_unregister_device( ps->pardev );
+ }
+#ifdef LINUX_26
+ parport_unregister_driver( &pt_drv );
+#endif
+#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.
+ */
+_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
+ */
+_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.
+ */
+_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.
+ */
+_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 ....................................................*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-23 07:22:56 +0000