[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / sr_vendor.c

/* -*-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_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;

	}
#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
	printk("%s: MODE SELECT 0x%x/%d\n", cd->cdi.name, 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
		printk("%s: switching blocklength to %d bytes failed\n",
		       cd->cdi.name, 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) {
			printk(KERN_INFO "%s: Hmm, seems the drive "
			   "doesn't support multisession CD's\n", cd->cdi.name);
			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) {
				printk(KERN_INFO "%s: Hmm, seems the cdrom "
				       "doesn't support multisession CD's\n",
				       cd->cdi.name);
				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) {
				printk(KERN_INFO "%s: Hmm, seems the drive "
				       "doesn't support multisession CD's\n",
				       cd->cdi.name);
				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) {
			printk(KERN_WARNING
			       "%s: No finished session\n", cd->cdi.name);
			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 */
		printk(KERN_WARNING
		   "%s: unknown vendor code (%i), not initialized ?\n",
		       cd->cdi.name, 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)
		printk(KERN_DEBUG "%s: multisession offset=%lu\n",
		       cd->cdi.name, sector);
#endif
	kfree(buffer);
	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/* --linux-c--
	2
	3	* vendor-specific code for SCSI CD-ROM's goes here.
	4	*
	5	* This is needed becauce most of the new features (multisession and
	6	* the like) are too new to be included into the SCSI-II standard (to
	7	* be exact: there is'nt anything in my draft copy).
	8	*
	9	* Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
	10	* multisession using the READ TOC command (like SONY).
	11	*
	12	* Rearranged stuff here: SCSI-3 is included allways, support
	13	* for NEC/TOSHIBA/HP commands is optional.
	14	*
	15	* Gerd Knorr <kraxel@cs.tu-berlin.de>
	16	*
	17	* --------------------------------------------------------------------------
	18	*
	19	* support for XA/multisession-CD's
	20	*
	21	* - NEC: Detection and support of multisession CD's.
	22	*
	23	* - TOSHIBA: Detection and support of multisession CD's.
	24	* Some XA-Sector tweaking, required for older drives.
	25	*
	26	* - SONY: Detection and support of multisession CD's.
	27	* added by Thomas Quinot <thomas@cuivre.freenix.fr>
	28	*
	29	* - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
	30	* work with SONY (SCSI3 now) code.
	31	*
	32	* - HP: Much like SONY, but a little different... (Thomas)
	33	* HP-Writers only ??? Maybe other CD-Writers work with this too ?
	34	* HP 6020 writers now supported.
	35	*/
	36
1da177e4 LT	37	#include <linux/cdrom.h>
	38	#include <linux/errno.h>
	39	#include <linux/string.h>
	40	#include <linux/bcd.h>
	41	#include <linux/blkdev.h>
5a0e3ad6	42	#include <linux/slab.h>
1da177e4 LT	43
	44	#include <scsi/scsi.h>
	45	#include <scsi/scsi_cmnd.h>
	46	#include <scsi/scsi_device.h>
	47	#include <scsi/scsi_host.h>
	48	#include <scsi/scsi_ioctl.h>
	49
	50	#include "sr.h"
	51
	52	#if 0
	53	#define DEBUG
	54	#endif
	55
	56	/* here are some constants to sort the vendors into groups */
	57
	58	#define VENDOR_SCSI3 1 /* default: scsi-3 mmc */
	59
	60	#define VENDOR_NEC 2
	61	#define VENDOR_TOSHIBA 3
	62	#define VENDOR_WRITER 4 /* pre-scsi3 writers */
	63
	64	#define VENDOR_TIMEOUT 30*HZ
	65
	66	void sr_vendor_init(Scsi_CD *cd)
	67	{
	68	#ifndef CONFIG_BLK_DEV_SR_VENDOR
	69	cd->vendor = VENDOR_SCSI3;
	70	#else
7b32b8e0 MW	71	const char *vendor = cd->device->vendor;
7b32b8e0 MW	72	const char *model = cd->device->model;
1da177e4 LT	73
	74	/* default */
	75	cd->vendor = VENDOR_SCSI3;
	76	if (cd->readcd_known)
	77	/* this is true for scsi3/mmc drives - no more checks */
	78	return;
	79
	80	if (cd->device->type == TYPE_WORM) {
	81	cd->vendor = VENDOR_WRITER;
	82
	83	} else if (!strncmp(vendor, "NEC", 3)) {
	84	cd->vendor = VENDOR_NEC;
	85	if (!strncmp(model, "CD-ROM DRIVE:25", 15) \|\|
	86	!strncmp(model, "CD-ROM DRIVE:36", 15) \|\|
	87	!strncmp(model, "CD-ROM DRIVE:83", 15) \|\|
	88	!strncmp(model, "CD-ROM DRIVE:84 ", 16)
	89	#if 0
	90	/* my NEC 3x returns the read-raw data if a read-raw
	91	is followed by a read for the same sector - aeb */
	92	\|\| !strncmp(model, "CD-ROM DRIVE:500", 16)
	93	#endif
	94	)
	95	/* these can't handle multisession, may hang */
	96	cd->cdi.mask \|= CDC_MULTI_SESSION;
	97
	98	} else if (!strncmp(vendor, "TOSHIBA", 7)) {
	99	cd->vendor = VENDOR_TOSHIBA;
	100
	101	}
	102	#endif
	103	}
	104
	105
	106	/* small handy function for switching block length using MODE SELECT,
	107	* used by sr_read_sector() */
	108
	109	int sr_set_blocklength(Scsi_CD *cd, int blocklength)
	110	{
	111	unsigned char buffer; / the buffer for the ioctl */
	112	struct packet_command cgc;
	113	struct ccs_modesel_head *modesel;
	114	int rc, density = 0;
	115
	116	#ifdef CONFIG_BLK_DEV_SR_VENDOR
	117	if (cd->vendor == VENDOR_TOSHIBA)
	118	density = (blocklength > 2048) ? 0x81 : 0x83;
	119	#endif
	120
5cbded58	121	buffer = kmalloc(512, GFP_KERNEL \| GFP_DMA);
1da177e4 LT	122	if (!buffer)
	123	return -ENOMEM;
	124
	125	#ifdef DEBUG
	126	printk("%s: MODE SELECT 0x%x/%d\n", cd->cdi.name, density, blocklength);
	127	#endif
	128	memset(&cgc, 0, sizeof(struct packet_command));
	129	cgc.cmd[0] = MODE_SELECT;
	130	cgc.cmd[1] = (1 << 4);
	131	cgc.cmd[4] = 12;
	132	modesel = (struct ccs_modesel_head *) buffer;
	133	memset(modesel, 0, sizeof(*modesel));
	134	modesel->block_desc_length = 0x08;
	135	modesel->density = density;
	136	modesel->block_length_med = (blocklength >> 8) & 0xff;
	137	modesel->block_length_lo = blocklength & 0xff;
	138	cgc.buffer = buffer;
	139	cgc.buflen = sizeof(*modesel);
	140	cgc.data_direction = DMA_TO_DEVICE;
	141	cgc.timeout = VENDOR_TIMEOUT;
	142	if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
	143	cd->device->sector_size = blocklength;
	144	}
	145	#ifdef DEBUG
	146	else
	147	printk("%s: switching blocklength to %d bytes failed\n",
	148	cd->cdi.name, blocklength);
	149	#endif
	150	kfree(buffer);
	151	return rc;
	152	}
	153
	154	/* This function gets called after a media change. Checks if the CD is
	155	multisession, asks for offset etc. */
	156
	157	int sr_cd_check(struct cdrom_device_info *cdi)
	158	{
	159	Scsi_CD *cd = cdi->handle;
	160	unsigned long sector;
	161	unsigned char buffer; / the buffer for the ioctl */
	162	struct packet_command cgc;
	163	int rc, no_multi;
	164
	165	if (cd->cdi.mask & CDC_MULTI_SESSION)
	166	return 0;
	167
5cbded58	168	buffer = kmalloc(512, GFP_KERNEL \| GFP_DMA);
1da177e4 LT	169	if (!buffer)
	170	return -ENOMEM;
	171
	172	sector = 0; /* the multisession sector offset goes here */
	173	no_multi = 0; /* flag: the drive can't handle multisession */
	174	rc = 0;
	175
	176	memset(&cgc, 0, sizeof(struct packet_command));
	177
	178	switch (cd->vendor) {
	179
	180	case VENDOR_SCSI3:
	181	cgc.cmd[0] = READ_TOC;
	182	cgc.cmd[8] = 12;
	183	cgc.cmd[9] = 0x40;
	184	cgc.buffer = buffer;
	185	cgc.buflen = 12;
	186	cgc.quiet = 1;
	187	cgc.data_direction = DMA_FROM_DEVICE;
	188	cgc.timeout = VENDOR_TIMEOUT;
	189	rc = sr_do_ioctl(cd, &cgc);
	190	if (rc != 0)
	191	break;
	192	if ((buffer[0] << 8) + buffer[1] < 0x0a) {
	193	printk(KERN_INFO "%s: Hmm, seems the drive "
	194	"doesn't support multisession CD's\n", cd->cdi.name);
	195	no_multi = 1;
	196	break;
	197	}
	198	sector = buffer[11] + (buffer[10] << 8) +
	199	(buffer[9] << 16) + (buffer[8] << 24);
	200	if (buffer[6] <= 1) {
	201	/* ignore sector offsets from first track */
	202	sector = 0;
	203	}
	204	break;
	205
	206	#ifdef CONFIG_BLK_DEV_SR_VENDOR
	207	case VENDOR_NEC:{
	208	unsigned long min, sec, frame;
	209	cgc.cmd[0] = 0xde;
	210	cgc.cmd[1] = 0x03;
	211	cgc.cmd[2] = 0xb0;
	212	cgc.buffer = buffer;
	213	cgc.buflen = 0x16;
	214	cgc.quiet = 1;
	215	cgc.data_direction = DMA_FROM_DEVICE;
	216	cgc.timeout = VENDOR_TIMEOUT;
	217	rc = sr_do_ioctl(cd, &cgc);
	218	if (rc != 0)
	219	break;
	220	if (buffer[14] != 0 && buffer[14] != 0xb0) {
	221	printk(KERN_INFO "%s: Hmm, seems the cdrom "
	222	"doesn't support multisession CD's\n",
	223	cd->cdi.name);
	224	no_multi = 1;
	225	break;
	226	}
2cee5dfa AB	227	min = bcd2bin(buffer[15]);
	228	sec = bcd2bin(buffer[16]);
	229	frame = bcd2bin(buffer[17]);
1da177e4 LT	230	sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
	231	break;
	232	}
	233
	234	case VENDOR_TOSHIBA:{
	235	unsigned long min, sec, frame;
	236
	237	/* we request some disc information (is it a XA-CD ?,
	238	* where starts the last session ?) */
	239	cgc.cmd[0] = 0xc7;
	240	cgc.cmd[1] = 0x03;
	241	cgc.buffer = buffer;
	242	cgc.buflen = 4;
	243	cgc.quiet = 1;
	244	cgc.data_direction = DMA_FROM_DEVICE;
	245	cgc.timeout = VENDOR_TIMEOUT;
	246	rc = sr_do_ioctl(cd, &cgc);
	247	if (rc == -EINVAL) {
	248	printk(KERN_INFO "%s: Hmm, seems the drive "
	249	"doesn't support multisession CD's\n",
	250	cd->cdi.name);
	251	no_multi = 1;
	252	break;
	253	}
	254	if (rc != 0)
	255	break;
2cee5dfa AB	256	min = bcd2bin(buffer[1]);
	257	sec = bcd2bin(buffer[2]);
	258	frame = bcd2bin(buffer[3]);
1da177e4 LT	259	sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
	260	if (sector)
	261	sector -= CD_MSF_OFFSET;
	262	sr_set_blocklength(cd, 2048);
	263	break;
	264	}
	265
	266	case VENDOR_WRITER:
	267	cgc.cmd[0] = READ_TOC;
	268	cgc.cmd[8] = 0x04;
	269	cgc.cmd[9] = 0x40;
	270	cgc.buffer = buffer;
	271	cgc.buflen = 0x04;
	272	cgc.quiet = 1;
	273	cgc.data_direction = DMA_FROM_DEVICE;
	274	cgc.timeout = VENDOR_TIMEOUT;
	275	rc = sr_do_ioctl(cd, &cgc);
	276	if (rc != 0) {
	277	break;
	278	}
	279	if ((rc = buffer[2]) == 0) {
	280	printk(KERN_WARNING
	281	"%s: No finished session\n", cd->cdi.name);
	282	break;
	283	}
	284	cgc.cmd[0] = READ_TOC; /* Read TOC */
	285	cgc.cmd[6] = rc & 0x7f; /* number of last session */
	286	cgc.cmd[8] = 0x0c;
	287	cgc.cmd[9] = 0x40;
	288	cgc.buffer = buffer;
	289	cgc.buflen = 12;
	290	cgc.quiet = 1;
	291	cgc.data_direction = DMA_FROM_DEVICE;
	292	cgc.timeout = VENDOR_TIMEOUT;
	293	rc = sr_do_ioctl(cd, &cgc);
	294	if (rc != 0) {
	295	break;
	296	}
	297	sector = buffer[11] + (buffer[10] << 8) +
	298	(buffer[9] << 16) + (buffer[8] << 24);
	299	break;
	300	#endif /* CONFIG_BLK_DEV_SR_VENDOR */
	301
	302	default:
	303	/* should not happen */
	304	printk(KERN_WARNING
	305	"%s: unknown vendor code (%i), not initialized ?\n",
	306	cd->cdi.name, cd->vendor);
	307	sector = 0;
	308	no_multi = 1;
	309	break;
	310	}
	311	cd->ms_offset = sector;
	312	cd->xa_flag = 0;
	313	if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
	314	cd->xa_flag = 1;
	315
	316	if (2048 != cd->device->sector_size) {
	317	sr_set_blocklength(cd, 2048);
	318	}
	319	if (no_multi)
	320	cdi->mask \|= CDC_MULTI_SESSION;
	321
	322	#ifdef DEBUG
323	if (sector)
324	printk(KERN_DEBUG "%s: multisession offset=%lu\n",
325	cd->cdi.name, sector);
326	#endif
327	kfree(buffer);
328	return rc;
329	}