drivers/scsi/sr_vendor.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* -*-linux-c-*-

  * vendor-specific code for SCSI CD-ROM's goes here.
  *
  * This is needed becauce most of the new features (multisession and
  * the like) are too new to be included into the SCSI-II standard (to
  * be exact: there is'nt anything in my draft copy).
  *
  * Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
  *           multisession using the READ TOC command (like SONY).
  *
  *           Rearranged stuff here: SCSI-3 is included allways, support
  *           for NEC/TOSHIBA/HP commands is optional.
  *
  *   Gerd Knorr <kraxel@cs.tu-berlin.de>
  *
  * --------------------------------------------------------------------------
  *
  * support for XA/multisession-CD's
  *
  *   - NEC:     Detection and support of multisession CD's.
  *
  *   - TOSHIBA: Detection and support of multisession CD's.
  *              Some XA-Sector tweaking, required for older drives.
  *
  *   - SONY:    Detection and support of multisession CD's.
  *              added by Thomas Quinot <thomas@cuivre.freenix.fr>
  *
  *   - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
  *              work with SONY (SCSI3 now)  code.
  *
  *   - HP:      Much like SONY, but a little different... (Thomas)
  *              HP-Writers only ??? Maybe other CD-Writers work with this too ?
  *              HP 6020 writers now supported.
  */

 #include <linux/cdrom.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/bcd.h>
 #include <linux/blkdev.h>
 #include <linux/slab.h>

 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_ioctl.h>

 #include "sr.h"

 #if 0
 #define DEBUG
 #endif

 /* here are some constants to sort the vendors into groups */

 #define VENDOR_SCSI3           1	/* default: scsi-3 mmc */

 #define VENDOR_NEC             2
 #define VENDOR_TOSHIBA         3
 #define VENDOR_WRITER          4	/* pre-scsi3 writers */
 #define VENDOR_CYGNAL_85ED     5	/* CD-on-a-chip */

 #define VENDOR_TIMEOUT	30*HZ

 void sr_vendor_init(Scsi_CD *cd)
 {
 #ifndef CONFIG_BLK_DEV_SR_VENDOR
 	cd->vendor = VENDOR_SCSI3;
 #else
 	const char *vendor = cd->device->vendor;
 	const char *model = cd->device->model;

 	/* default */
 	cd->vendor = VENDOR_SCSI3;
 	if (cd->readcd_known)
 		/* this is true for scsi3/mmc drives - no more checks */
 		return;

 	if (cd->device->type == TYPE_WORM) {
 		cd->vendor = VENDOR_WRITER;

 	} else if (!strncmp(vendor, "NEC", 3)) {
 		cd->vendor = VENDOR_NEC;
 		if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
 		    !strncmp(model, "CD-ROM DRIVE:36", 15) ||
 		    !strncmp(model, "CD-ROM DRIVE:83", 15) ||
 		    !strncmp(model, "CD-ROM DRIVE:84 ", 16)
 #if 0
 		/* my NEC 3x returns the read-raw data if a read-raw
 		   is followed by a read for the same sector - aeb */
 		    || !strncmp(model, "CD-ROM DRIVE:500", 16)
 #endif
 		    )
 			/* these can't handle multisession, may hang */
 			cd->cdi.mask |= CDC_MULTI_SESSION;

 	} else if (!strncmp(vendor, "TOSHIBA", 7)) {
 		cd->vendor = VENDOR_TOSHIBA;

 	} else if (!strncmp(vendor, "Beurer", 6) &&
 		   !strncmp(model, "Gluco Memory", 12)) {
 		/* The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip
 		   that only accepts a subset of SCSI commands.  Most of the
 		   not-implemented commands are fine to fail, but a few,
 		   particularly around the MMC or Audio commands, will put the
 		   device into an unrecoverable state, so they need to be
 		   avoided at all costs.
 		*/
 		cd->vendor = VENDOR_CYGNAL_85ED;
 		cd->cdi.mask |= (
 			CDC_MULTI_SESSION |
 			CDC_CLOSE_TRAY | CDC_OPEN_TRAY |
 			CDC_LOCK |
 			CDC_GENERIC_PACKET |
 			CDC_PLAY_AUDIO
 			);
 	}
 #endif
 }


 /* small handy function for switching block length using MODE SELECT,
  * used by sr_read_sector() */

 int sr_set_blocklength(Scsi_CD *cd, int blocklength)
 {
 	unsigned char *buffer;	/* the buffer for the ioctl */
 	struct packet_command cgc;
 	struct ccs_modesel_head *modesel;
 	int rc, density = 0;

 #ifdef CONFIG_BLK_DEV_SR_VENDOR
 	if (cd->vendor == VENDOR_TOSHIBA)
 		density = (blocklength > 2048) ? 0x81 : 0x83;
 #endif

 	buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 	if (!buffer)
 		return -ENOMEM;

 #ifdef DEBUG
 	sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
 #endif
 	memset(&cgc, 0, sizeof(struct packet_command));
 	cgc.cmd[0] = MODE_SELECT;
 	cgc.cmd[1] = (1 << 4);
 	cgc.cmd[4] = 12;
 	modesel = (struct ccs_modesel_head *) buffer;
 	memset(modesel, 0, sizeof(*modesel));
 	modesel->block_desc_length = 0x08;
 	modesel->density = density;
 	modesel->block_length_med = (blocklength >> 8) & 0xff;
 	modesel->block_length_lo = blocklength & 0xff;
 	cgc.buffer = buffer;
 	cgc.buflen = sizeof(*modesel);
 	cgc.data_direction = DMA_TO_DEVICE;
 	cgc.timeout = VENDOR_TIMEOUT;
 	if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
 		cd->device->sector_size = blocklength;
 	}
 #ifdef DEBUG
 	else
 		sr_printk(KERN_INFO, cd,
 			  "switching blocklength to %d bytes failed\n",
 			  blocklength);
 #endif
 	kfree(buffer);
 	return rc;
 }

 /* This function gets called after a media change. Checks if the CD is
    multisession, asks for offset etc. */

 int sr_cd_check(struct cdrom_device_info *cdi)
 {
 	Scsi_CD *cd = cdi->handle;
 	unsigned long sector;
 	unsigned char *buffer;	/* the buffer for the ioctl */
 	struct packet_command cgc;
 	int rc, no_multi;

 	if (cd->cdi.mask & CDC_MULTI_SESSION)
 		return 0;

 	buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 	if (!buffer)
 		return -ENOMEM;

 	sector = 0;		/* the multisession sector offset goes here  */
 	no_multi = 0;		/* flag: the drive can't handle multisession */
 	rc = 0;

 	memset(&cgc, 0, sizeof(struct packet_command));

 	switch (cd->vendor) {

 	case VENDOR_SCSI3:
 		cgc.cmd[0] = READ_TOC;
 		cgc.cmd[8] = 12;
 		cgc.cmd[9] = 0x40;
 		cgc.buffer = buffer;
 		cgc.buflen = 12;
 		cgc.quiet = 1;
 		cgc.data_direction = DMA_FROM_DEVICE;
 		cgc.timeout = VENDOR_TIMEOUT;
 		rc = sr_do_ioctl(cd, &cgc);
 		if (rc != 0)
 			break;
 		if ((buffer[0] << 8) + buffer[1] < 0x0a) {
 			sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
 			   "doesn't support multisession CD's\n");
 			no_multi = 1;
 			break;
 		}
 		sector = buffer[11] + (buffer[10] << 8) +
 		    (buffer[9] << 16) + (buffer[8] << 24);
 		if (buffer[6] <= 1) {
 			/* ignore sector offsets from first track */
 			sector = 0;
 		}
 		break;

 #ifdef CONFIG_BLK_DEV_SR_VENDOR
 	case VENDOR_NEC:{
 			unsigned long min, sec, frame;
 			cgc.cmd[0] = 0xde;
 			cgc.cmd[1] = 0x03;
 			cgc.cmd[2] = 0xb0;
 			cgc.buffer = buffer;
 			cgc.buflen = 0x16;
 			cgc.quiet = 1;
 			cgc.data_direction = DMA_FROM_DEVICE;
 			cgc.timeout = VENDOR_TIMEOUT;
 			rc = sr_do_ioctl(cd, &cgc);
 			if (rc != 0)
 				break;
 			if (buffer[14] != 0 && buffer[14] != 0xb0) {
 				sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
 					  "doesn't support multisession CD's\n");

 				no_multi = 1;
 				break;
 			}
 			min = bcd2bin(buffer[15]);
 			sec = bcd2bin(buffer[16]);
 			frame = bcd2bin(buffer[17]);
 			sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 			break;
 		}

 	case VENDOR_TOSHIBA:{
 			unsigned long min, sec, frame;

 			/* we request some disc information (is it a XA-CD ?,
 			 * where starts the last session ?) */
 			cgc.cmd[0] = 0xc7;
 			cgc.cmd[1] = 0x03;
 			cgc.buffer = buffer;
 			cgc.buflen = 4;
 			cgc.quiet = 1;
 			cgc.data_direction = DMA_FROM_DEVICE;
 			cgc.timeout = VENDOR_TIMEOUT;
 			rc = sr_do_ioctl(cd, &cgc);
 			if (rc == -EINVAL) {
 				sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
 					  "doesn't support multisession CD's\n");
 				no_multi = 1;
 				break;
 			}
 			if (rc != 0)
 				break;
 			min = bcd2bin(buffer[1]);
 			sec = bcd2bin(buffer[2]);
 			frame = bcd2bin(buffer[3]);
 			sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 			if (sector)
 				sector -= CD_MSF_OFFSET;
 			sr_set_blocklength(cd, 2048);
 			break;
 		}

 	case VENDOR_WRITER:
 		cgc.cmd[0] = READ_TOC;
 		cgc.cmd[8] = 0x04;
 		cgc.cmd[9] = 0x40;
 		cgc.buffer = buffer;
 		cgc.buflen = 0x04;
 		cgc.quiet = 1;
 		cgc.data_direction = DMA_FROM_DEVICE;
 		cgc.timeout = VENDOR_TIMEOUT;
 		rc = sr_do_ioctl(cd, &cgc);
 		if (rc != 0) {
 			break;
 		}
 		if ((rc = buffer[2]) == 0) {
 			sr_printk(KERN_WARNING, cd,
 				  "No finished session\n");
 			break;
 		}
 		cgc.cmd[0] = READ_TOC;	/* Read TOC */
 		cgc.cmd[6] = rc & 0x7f;	/* number of last session */
 		cgc.cmd[8] = 0x0c;
 		cgc.cmd[9] = 0x40;
 		cgc.buffer = buffer;
 		cgc.buflen = 12;
 		cgc.quiet = 1;
 		cgc.data_direction = DMA_FROM_DEVICE;
 		cgc.timeout = VENDOR_TIMEOUT;
 		rc = sr_do_ioctl(cd, &cgc);
 		if (rc != 0) {
 			break;
 		}
 		sector = buffer[11] + (buffer[10] << 8) +
 		    (buffer[9] << 16) + (buffer[8] << 24);
 		break;
 #endif				/* CONFIG_BLK_DEV_SR_VENDOR */

 	default:
 		/* should not happen */
 		sr_printk(KERN_WARNING, cd,
 			  "unknown vendor code (%i), not initialized ?\n",
 			  cd->vendor);
 		sector = 0;
 		no_multi = 1;
 		break;
 	}
 	cd->ms_offset = sector;
 	cd->xa_flag = 0;
 	if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
 		cd->xa_flag = 1;

 	if (2048 != cd->device->sector_size) {
 		sr_set_blocklength(cd, 2048);
 	}
 	if (no_multi)
 		cdi->mask |= CDC_MULTI_SESSION;

 #ifdef DEBUG
 	if (sector)
 		sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
 			  sector);
 #endif
 	kfree(buffer);
 	return rc;
 }
	// SPDX-License-Identifier: GPL-2.0
	/* --linux-c--

	* vendor-specific code for SCSI CD-ROM's goes here.
	*
	* This is needed becauce most of the new features (multisession and
	* the like) are too new to be included into the SCSI-II standard (to
	* be exact: there is'nt anything in my draft copy).
	*
	* Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
	* multisession using the READ TOC command (like SONY).
	*
	* Rearranged stuff here: SCSI-3 is included allways, support
	* for NEC/TOSHIBA/HP commands is optional.
	*
	* Gerd Knorr <kraxel@cs.tu-berlin.de>
	*
	* --------------------------------------------------------------------------
	*
	* support for XA/multisession-CD's
	*
	* - NEC: Detection and support of multisession CD's.
	*
	* - TOSHIBA: Detection and support of multisession CD's.
	* Some XA-Sector tweaking, required for older drives.
	*
	* - SONY: Detection and support of multisession CD's.
	* added by Thomas Quinot <thomas@cuivre.freenix.fr>
	*
	* - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
	* work with SONY (SCSI3 now) code.
	*
	* - HP: Much like SONY, but a little different... (Thomas)
	* HP-Writers only ??? Maybe other CD-Writers work with this too ?
	* HP 6020 writers now supported.
	*/

	#include <linux/cdrom.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/bcd.h>
	#include <linux/blkdev.h>
	#include <linux/slab.h>

	#include <scsi/scsi.h>
	#include <scsi/scsi_cmnd.h>
	#include <scsi/scsi_device.h>
	#include <scsi/scsi_host.h>
	#include <scsi/scsi_ioctl.h>

	#include "sr.h"

	#if 0
	#define DEBUG
	#endif

	/* here are some constants to sort the vendors into groups */

	#define VENDOR_SCSI3 1 /* default: scsi-3 mmc */

	#define VENDOR_NEC 2
	#define VENDOR_TOSHIBA 3
	#define VENDOR_WRITER 4 /* pre-scsi3 writers */
	#define VENDOR_CYGNAL_85ED 5 /* CD-on-a-chip */

	#define VENDOR_TIMEOUT 30*HZ

	void sr_vendor_init(Scsi_CD *cd)
	{
	#ifndef CONFIG_BLK_DEV_SR_VENDOR
	cd->vendor = VENDOR_SCSI3;
	#else
	const char *vendor = cd->device->vendor;
	const char *model = cd->device->model;

	/* default */
	cd->vendor = VENDOR_SCSI3;
	if (cd->readcd_known)
	/* this is true for scsi3/mmc drives - no more checks */
	return;

	if (cd->device->type == TYPE_WORM) {
	cd->vendor = VENDOR_WRITER;

	} else if (!strncmp(vendor, "NEC", 3)) {
	cd->vendor = VENDOR_NEC;
	if (!strncmp(model, "CD-ROM DRIVE:25", 15) \|\|
	!strncmp(model, "CD-ROM DRIVE:36", 15) \|\|
	!strncmp(model, "CD-ROM DRIVE:83", 15) \|\|
	!strncmp(model, "CD-ROM DRIVE:84 ", 16)
	#if 0
	/* my NEC 3x returns the read-raw data if a read-raw
	is followed by a read for the same sector - aeb */
	\|\| !strncmp(model, "CD-ROM DRIVE:500", 16)
	#endif
	)
	/* these can't handle multisession, may hang */
	cd->cdi.mask \|= CDC_MULTI_SESSION;

	} else if (!strncmp(vendor, "TOSHIBA", 7)) {
	cd->vendor = VENDOR_TOSHIBA;

	} else if (!strncmp(vendor, "Beurer", 6) &&
	!strncmp(model, "Gluco Memory", 12)) {
	/* The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip
	that only accepts a subset of SCSI commands. Most of the
	not-implemented commands are fine to fail, but a few,
	particularly around the MMC or Audio commands, will put the
	device into an unrecoverable state, so they need to be
	avoided at all costs.
	*/
	cd->vendor = VENDOR_CYGNAL_85ED;
	cd->cdi.mask \|= (
	CDC_MULTI_SESSION \|
	CDC_CLOSE_TRAY \| CDC_OPEN_TRAY \|
	CDC_LOCK \|
	CDC_GENERIC_PACKET \|
	CDC_PLAY_AUDIO
	);
	}
	#endif
	}


	/* small handy function for switching block length using MODE SELECT,
	* used by sr_read_sector() */

	int sr_set_blocklength(Scsi_CD *cd, int blocklength)
	{
	unsigned char buffer; / the buffer for the ioctl */
	struct packet_command cgc;
	struct ccs_modesel_head *modesel;
	int rc, density = 0;

	#ifdef CONFIG_BLK_DEV_SR_VENDOR
	if (cd->vendor == VENDOR_TOSHIBA)
	density = (blocklength > 2048) ? 0x81 : 0x83;
	#endif

	buffer = kmalloc(512, GFP_KERNEL \| GFP_DMA);
	if (!buffer)
	return -ENOMEM;

	#ifdef DEBUG
	sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
	#endif
	memset(&cgc, 0, sizeof(struct packet_command));
	cgc.cmd[0] = MODE_SELECT;
	cgc.cmd[1] = (1 << 4);
	cgc.cmd[4] = 12;
	modesel = (struct ccs_modesel_head *) buffer;
	memset(modesel, 0, sizeof(*modesel));
	modesel->block_desc_length = 0x08;
	modesel->density = density;
	modesel->block_length_med = (blocklength >> 8) & 0xff;
	modesel->block_length_lo = blocklength & 0xff;
	cgc.buffer = buffer;
	cgc.buflen = sizeof(*modesel);
	cgc.data_direction = DMA_TO_DEVICE;
	cgc.timeout = VENDOR_TIMEOUT;
	if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
	cd->device->sector_size = blocklength;
	}
	#ifdef DEBUG
	else
	sr_printk(KERN_INFO, cd,
	"switching blocklength to %d bytes failed\n",
	blocklength);
	#endif
	kfree(buffer);
	return rc;
	}

	/* This function gets called after a media change. Checks if the CD is
	multisession, asks for offset etc. */

	int sr_cd_check(struct cdrom_device_info *cdi)
	{
	Scsi_CD *cd = cdi->handle;
	unsigned long sector;
	unsigned char buffer; / the buffer for the ioctl */
	struct packet_command cgc;
	int rc, no_multi;

	if (cd->cdi.mask & CDC_MULTI_SESSION)
	return 0;

	buffer = kmalloc(512, GFP_KERNEL \| GFP_DMA);
	if (!buffer)
	return -ENOMEM;

	sector = 0; /* the multisession sector offset goes here */
	no_multi = 0; /* flag: the drive can't handle multisession */
	rc = 0;

	memset(&cgc, 0, sizeof(struct packet_command));

	switch (cd->vendor) {

	case VENDOR_SCSI3:
	cgc.cmd[0] = READ_TOC;
	cgc.cmd[8] = 12;
	cgc.cmd[9] = 0x40;
	cgc.buffer = buffer;
	cgc.buflen = 12;
	cgc.quiet = 1;
	cgc.data_direction = DMA_FROM_DEVICE;
	cgc.timeout = VENDOR_TIMEOUT;
	rc = sr_do_ioctl(cd, &cgc);
	if (rc != 0)
	break;
	if ((buffer[0] << 8) + buffer[1] < 0x0a) {
	sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
	"doesn't support multisession CD's\n");
	no_multi = 1;
	break;
	}
	sector = buffer[11] + (buffer[10] << 8) +
	(buffer[9] << 16) + (buffer[8] << 24);
	if (buffer[6] <= 1) {
	/* ignore sector offsets from first track */
	sector = 0;
	}
	break;

	#ifdef CONFIG_BLK_DEV_SR_VENDOR
	case VENDOR_NEC:{
	unsigned long min, sec, frame;
	cgc.cmd[0] = 0xde;
	cgc.cmd[1] = 0x03;
	cgc.cmd[2] = 0xb0;
	cgc.buffer = buffer;
	cgc.buflen = 0x16;
	cgc.quiet = 1;
	cgc.data_direction = DMA_FROM_DEVICE;
	cgc.timeout = VENDOR_TIMEOUT;
	rc = sr_do_ioctl(cd, &cgc);
	if (rc != 0)
	break;
	if (buffer[14] != 0 && buffer[14] != 0xb0) {
	sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
	"doesn't support multisession CD's\n");

	no_multi = 1;
	break;
	}
	min = bcd2bin(buffer[15]);
	sec = bcd2bin(buffer[16]);
	frame = bcd2bin(buffer[17]);
	sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
	break;
	}

	case VENDOR_TOSHIBA:{
	unsigned long min, sec, frame;

	/* we request some disc information (is it a XA-CD ?,
	* where starts the last session ?) */
	cgc.cmd[0] = 0xc7;
	cgc.cmd[1] = 0x03;
	cgc.buffer = buffer;
	cgc.buflen = 4;
	cgc.quiet = 1;
	cgc.data_direction = DMA_FROM_DEVICE;
	cgc.timeout = VENDOR_TIMEOUT;
	rc = sr_do_ioctl(cd, &cgc);
	if (rc == -EINVAL) {
	sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
	"doesn't support multisession CD's\n");
	no_multi = 1;
	break;
	}
	if (rc != 0)
	break;
	min = bcd2bin(buffer[1]);
	sec = bcd2bin(buffer[2]);
	frame = bcd2bin(buffer[3]);
	sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
	if (sector)
	sector -= CD_MSF_OFFSET;
	sr_set_blocklength(cd, 2048);
	break;
	}

	case VENDOR_WRITER:
	cgc.cmd[0] = READ_TOC;
	cgc.cmd[8] = 0x04;
	cgc.cmd[9] = 0x40;
	cgc.buffer = buffer;
	cgc.buflen = 0x04;
	cgc.quiet = 1;
	cgc.data_direction = DMA_FROM_DEVICE;
	cgc.timeout = VENDOR_TIMEOUT;
	rc = sr_do_ioctl(cd, &cgc);
	if (rc != 0) {
	break;
	}
	if ((rc = buffer[2]) == 0) {
	sr_printk(KERN_WARNING, cd,
	"No finished session\n");
	break;
	}
	cgc.cmd[0] = READ_TOC; /* Read TOC */
	cgc.cmd[6] = rc & 0x7f; /* number of last session */
	cgc.cmd[8] = 0x0c;
	cgc.cmd[9] = 0x40;
	cgc.buffer = buffer;
	cgc.buflen = 12;
	cgc.quiet = 1;
	cgc.data_direction = DMA_FROM_DEVICE;
	cgc.timeout = VENDOR_TIMEOUT;
	rc = sr_do_ioctl(cd, &cgc);
	if (rc != 0) {
	break;
	}
	sector = buffer[11] + (buffer[10] << 8) +
	(buffer[9] << 16) + (buffer[8] << 24);
	break;
	#endif /* CONFIG_BLK_DEV_SR_VENDOR */

	default:
	/* should not happen */
	sr_printk(KERN_WARNING, cd,
	"unknown vendor code (%i), not initialized ?\n",
	cd->vendor);
	sector = 0;
	no_multi = 1;
	break;
	}
	cd->ms_offset = sector;
	cd->xa_flag = 0;
	if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
	cd->xa_flag = 1;

	if (2048 != cd->device->sector_size) {
	sr_set_blocklength(cd, 2048);
	}
	if (no_multi)
	cdi->mask \|= CDC_MULTI_SESSION;

	#ifdef DEBUG
	if (sector)
	sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
	sector);
	#endif
	kfree(buffer);
	return rc;
	}