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d94d94969a
The allocated buffers are used as a command payload, for which the block layer and/or DMA API do the proper bounce buffering if needed. Link: https://lore.kernel.org/r/20211222090842.920724-1-hch@lst.de Reported-by: Baoquan He <bhe@redhat.com> Reviewed-by: Baoquan He <bhe@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
341 lines
8.8 KiB
C
341 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* -*-linux-c-*-
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* vendor-specific code for SCSI CD-ROM's goes here.
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*
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* This is needed becauce most of the new features (multisession and
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* the like) are too new to be included into the SCSI-II standard (to
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* be exact: there is'nt anything in my draft copy).
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*
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* Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
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* multisession using the READ TOC command (like SONY).
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*
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* Rearranged stuff here: SCSI-3 is included allways, support
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* for NEC/TOSHIBA/HP commands is optional.
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*
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* Gerd Knorr <kraxel@cs.tu-berlin.de>
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*
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* --------------------------------------------------------------------------
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*
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* support for XA/multisession-CD's
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*
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* - NEC: Detection and support of multisession CD's.
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*
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* - TOSHIBA: Detection and support of multisession CD's.
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* Some XA-Sector tweaking, required for older drives.
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*
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* - SONY: Detection and support of multisession CD's.
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* added by Thomas Quinot <thomas@cuivre.freenix.fr>
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*
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* - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
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* work with SONY (SCSI3 now) code.
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*
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* - HP: Much like SONY, but a little different... (Thomas)
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* HP-Writers only ??? Maybe other CD-Writers work with this too ?
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* HP 6020 writers now supported.
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*/
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#include <linux/cdrom.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/bcd.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include "sr.h"
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#if 0
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#define DEBUG
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#endif
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/* here are some constants to sort the vendors into groups */
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#define VENDOR_SCSI3 1 /* default: scsi-3 mmc */
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#define VENDOR_NEC 2
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#define VENDOR_TOSHIBA 3
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#define VENDOR_WRITER 4 /* pre-scsi3 writers */
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#define VENDOR_CYGNAL_85ED 5 /* CD-on-a-chip */
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#define VENDOR_TIMEOUT 30*HZ
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void sr_vendor_init(Scsi_CD *cd)
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{
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const char *vendor = cd->device->vendor;
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const char *model = cd->device->model;
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/* default */
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cd->vendor = VENDOR_SCSI3;
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if (cd->readcd_known)
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/* this is true for scsi3/mmc drives - no more checks */
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return;
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if (cd->device->type == TYPE_WORM) {
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cd->vendor = VENDOR_WRITER;
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} else if (!strncmp(vendor, "NEC", 3)) {
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cd->vendor = VENDOR_NEC;
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if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
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!strncmp(model, "CD-ROM DRIVE:36", 15) ||
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!strncmp(model, "CD-ROM DRIVE:83", 15) ||
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!strncmp(model, "CD-ROM DRIVE:84 ", 16)
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#if 0
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/* my NEC 3x returns the read-raw data if a read-raw
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is followed by a read for the same sector - aeb */
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|| !strncmp(model, "CD-ROM DRIVE:500", 16)
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#endif
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)
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/* these can't handle multisession, may hang */
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cd->cdi.mask |= CDC_MULTI_SESSION;
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} else if (!strncmp(vendor, "TOSHIBA", 7)) {
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cd->vendor = VENDOR_TOSHIBA;
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} else if (!strncmp(vendor, "Beurer", 6) &&
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!strncmp(model, "Gluco Memory", 12)) {
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/* The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip
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that only accepts a subset of SCSI commands. Most of the
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not-implemented commands are fine to fail, but a few,
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particularly around the MMC or Audio commands, will put the
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device into an unrecoverable state, so they need to be
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avoided at all costs.
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*/
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cd->vendor = VENDOR_CYGNAL_85ED;
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cd->cdi.mask |= (
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CDC_MULTI_SESSION |
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CDC_CLOSE_TRAY | CDC_OPEN_TRAY |
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CDC_LOCK |
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CDC_GENERIC_PACKET |
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CDC_PLAY_AUDIO
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);
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}
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}
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/* small handy function for switching block length using MODE SELECT,
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* used by sr_read_sector() */
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int sr_set_blocklength(Scsi_CD *cd, int blocklength)
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{
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unsigned char *buffer; /* the buffer for the ioctl */
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struct packet_command cgc;
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struct ccs_modesel_head *modesel;
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int rc, density = 0;
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if (cd->vendor == VENDOR_TOSHIBA)
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density = (blocklength > 2048) ? 0x81 : 0x83;
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buffer = kmalloc(512, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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#ifdef DEBUG
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sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
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#endif
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memset(&cgc, 0, sizeof(struct packet_command));
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cgc.cmd[0] = MODE_SELECT;
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cgc.cmd[1] = (1 << 4);
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cgc.cmd[4] = 12;
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modesel = (struct ccs_modesel_head *) buffer;
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memset(modesel, 0, sizeof(*modesel));
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modesel->block_desc_length = 0x08;
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modesel->density = density;
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modesel->block_length_med = (blocklength >> 8) & 0xff;
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modesel->block_length_lo = blocklength & 0xff;
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cgc.buffer = buffer;
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cgc.buflen = sizeof(*modesel);
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cgc.data_direction = DMA_TO_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
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cd->device->sector_size = blocklength;
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}
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#ifdef DEBUG
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else
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sr_printk(KERN_INFO, cd,
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"switching blocklength to %d bytes failed\n",
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blocklength);
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#endif
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kfree(buffer);
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return rc;
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}
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/* This function gets called after a media change. Checks if the CD is
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multisession, asks for offset etc. */
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int sr_cd_check(struct cdrom_device_info *cdi)
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{
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Scsi_CD *cd = cdi->handle;
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unsigned long sector;
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unsigned char *buffer; /* the buffer for the ioctl */
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struct packet_command cgc;
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int rc, no_multi;
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if (cd->cdi.mask & CDC_MULTI_SESSION)
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return 0;
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buffer = kmalloc(512, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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sector = 0; /* the multisession sector offset goes here */
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no_multi = 0; /* flag: the drive can't handle multisession */
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rc = 0;
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memset(&cgc, 0, sizeof(struct packet_command));
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switch (cd->vendor) {
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case VENDOR_SCSI3:
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cgc.cmd[0] = READ_TOC;
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cgc.cmd[8] = 12;
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cgc.cmd[9] = 0x40;
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cgc.buffer = buffer;
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cgc.buflen = 12;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0)
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break;
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if ((buffer[0] << 8) + buffer[1] < 0x0a) {
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sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
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"doesn't support multisession CD's\n");
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no_multi = 1;
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break;
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}
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sector = buffer[11] + (buffer[10] << 8) +
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(buffer[9] << 16) + (buffer[8] << 24);
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if (buffer[6] <= 1) {
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/* ignore sector offsets from first track */
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sector = 0;
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}
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break;
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case VENDOR_NEC:{
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unsigned long min, sec, frame;
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cgc.cmd[0] = 0xde;
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cgc.cmd[1] = 0x03;
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cgc.cmd[2] = 0xb0;
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cgc.buffer = buffer;
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cgc.buflen = 0x16;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0)
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break;
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if (buffer[14] != 0 && buffer[14] != 0xb0) {
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sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
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"doesn't support multisession CD's\n");
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no_multi = 1;
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break;
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}
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min = bcd2bin(buffer[15]);
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sec = bcd2bin(buffer[16]);
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frame = bcd2bin(buffer[17]);
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sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
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break;
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}
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case VENDOR_TOSHIBA:{
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unsigned long min, sec, frame;
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/* we request some disc information (is it a XA-CD ?,
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* where starts the last session ?) */
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cgc.cmd[0] = 0xc7;
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cgc.cmd[1] = 0x03;
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cgc.buffer = buffer;
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cgc.buflen = 4;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc == -EINVAL) {
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sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
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"doesn't support multisession CD's\n");
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no_multi = 1;
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break;
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}
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if (rc != 0)
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break;
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min = bcd2bin(buffer[1]);
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sec = bcd2bin(buffer[2]);
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frame = bcd2bin(buffer[3]);
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sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
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if (sector)
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sector -= CD_MSF_OFFSET;
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sr_set_blocklength(cd, 2048);
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break;
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}
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case VENDOR_WRITER:
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cgc.cmd[0] = READ_TOC;
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cgc.cmd[8] = 0x04;
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cgc.cmd[9] = 0x40;
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cgc.buffer = buffer;
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cgc.buflen = 0x04;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0) {
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break;
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}
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if ((rc = buffer[2]) == 0) {
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sr_printk(KERN_WARNING, cd,
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"No finished session\n");
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break;
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}
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cgc.cmd[0] = READ_TOC; /* Read TOC */
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cgc.cmd[6] = rc & 0x7f; /* number of last session */
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cgc.cmd[8] = 0x0c;
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cgc.cmd[9] = 0x40;
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cgc.buffer = buffer;
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cgc.buflen = 12;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0) {
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break;
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}
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sector = buffer[11] + (buffer[10] << 8) +
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(buffer[9] << 16) + (buffer[8] << 24);
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break;
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default:
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/* should not happen */
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sr_printk(KERN_WARNING, cd,
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"unknown vendor code (%i), not initialized ?\n",
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cd->vendor);
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sector = 0;
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no_multi = 1;
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break;
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}
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cd->ms_offset = sector;
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cd->xa_flag = 0;
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if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
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cd->xa_flag = 1;
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if (2048 != cd->device->sector_size) {
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sr_set_blocklength(cd, 2048);
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}
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if (no_multi)
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cdi->mask |= CDC_MULTI_SESSION;
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#ifdef DEBUG
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if (sector)
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sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
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sector);
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#endif
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kfree(buffer);
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return rc;
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}
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