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linux/drivers/scsi/sr_vendor.c
Diego Elio Pettenò 396bbe1427 sr_vendor: support Beurer GL50 evo CD-on-a-chip devices. 
The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip that only
accepts a subset of SCSI commands, and supports neither audio commands
nor generic packet commands.

Actually sending those commands bring the device to an unrecoverable
state that causes the device to hang and reset.

To: Jens Axboe <axboe@kernel.dk>
Cc: linux-kernel@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-11-26 13:02:26 -07:00

349 lines
9.0 KiB
C
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// 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;
}
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