LXR linux/drivers/scsi/sr

   1// SPDX-License-Identifier: GPL-2.0
   2/* -*-linux-c-*-
   3
   4 * vendor-specific code for SCSI CD-ROM's goes here.
   5 *
   6 * This is needed becauce most of the new features (multisession and
   7 * the like) are too new to be included into the SCSI-II standard (to
   8 * be exact: there is'nt anything in my draft copy).
   9 *
  10 * Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
  11 *           multisession using the READ TOC command (like SONY).
  12 *
  13 *           Rearranged stuff here: SCSI-3 is included allways, support
  14 *           for NEC/TOSHIBA/HP commands is optional.
  15 *
  16 *   Gerd Knorr <kraxel@cs.tu-berlin.de> 
  17 *
  18 * --------------------------------------------------------------------------
  19 *
  20 * support for XA/multisession-CD's
  21 * 
  22 *   - NEC:     Detection and support of multisession CD's.
  23 *     
  24 *   - TOSHIBA: Detection and support of multisession CD's.
  25 *              Some XA-Sector tweaking, required for older drives.
  26 *
  27 *   - SONY:    Detection and support of multisession CD's.
  28 *              added by Thomas Quinot <thomas@cuivre.freenix.fr>
  29 *
  30 *   - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
  31 *              work with SONY (SCSI3 now)  code.
  32 *
  33 *   - HP:      Much like SONY, but a little different... (Thomas)
  34 *              HP-Writers only ??? Maybe other CD-Writers work with this too ?
  35 *              HP 6020 writers now supported.
  36 */
  37
  38#include <linux/cdrom.h>
  39#include <linux/errno.h>
  40#include <linux/string.h>
  41#include <linux/bcd.h>
  42#include <linux/blkdev.h>
  43#include <linux/slab.h>
  44
  45#include <scsi/scsi.h>
  46#include <scsi/scsi_cmnd.h>
  47#include <scsi/scsi_device.h>
  48#include <scsi/scsi_host.h>
  49#include <scsi/scsi_ioctl.h>
  50
  51#include "sr.h"
  52
  53#if 0
  54#define DEBUG
  55#endif
  56
  57/* here are some constants to sort the vendors into groups */
  58
  59#define VENDOR_SCSI3           1        /* default: scsi-3 mmc */
  60
  61#define VENDOR_NEC             2
  62#define VENDOR_TOSHIBA         3
  63#define VENDOR_WRITER          4        /* pre-scsi3 writers */
  64
  65#define VENDOR_TIMEOUT  30*HZ
  66
  67void sr_vendor_init(Scsi_CD *cd)
  68{
  69#ifndef CONFIG_BLK_DEV_SR_VENDOR
  70        cd->vendor = VENDOR_SCSI3;
  71#else
  72        const char *vendor = cd->device->vendor;
  73        const char *model = cd->device->model;
  74        
  75        /* default */
  76        cd->vendor = VENDOR_SCSI3;
  77        if (cd->readcd_known)
  78                /* this is true for scsi3/mmc drives - no more checks */
  79                return;
  80
  81        if (cd->device->type == TYPE_WORM) {
  82                cd->vendor = VENDOR_WRITER;
  83
  84        } else if (!strncmp(vendor, "NEC", 3)) {
  85                cd->vendor = VENDOR_NEC;
  86                if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
  87                    !strncmp(model, "CD-ROM DRIVE:36", 15) ||
  88                    !strncmp(model, "CD-ROM DRIVE:83", 15) ||
  89                    !strncmp(model, "CD-ROM DRIVE:84 ", 16)
  90#if 0
  91                /* my NEC 3x returns the read-raw data if a read-raw
  92                   is followed by a read for the same sector - aeb */
  93                    || !strncmp(model, "CD-ROM DRIVE:500", 16)
  94#endif
  95                    )
  96                        /* these can't handle multisession, may hang */
  97                        cd->cdi.mask |= CDC_MULTI_SESSION;
  98
  99        } else if (!strncmp(vendor, "TOSHIBA", 7)) {
 100                cd->vendor = VENDOR_TOSHIBA;
 101
 102        }
 103#endif
 104}
 105
 106
 107/* small handy function for switching block length using MODE SELECT,
 108 * used by sr_read_sector() */
 109
 110int sr_set_blocklength(Scsi_CD *cd, int blocklength)
 111{
 112        unsigned char *buffer;  /* the buffer for the ioctl */
 113        struct packet_command cgc;
 114        struct ccs_modesel_head *modesel;
 115        int rc, density = 0;
 116
 117#ifdef CONFIG_BLK_DEV_SR_VENDOR
 118        if (cd->vendor == VENDOR_TOSHIBA)
 119                density = (blocklength > 2048) ? 0x81 : 0x83;
 120#endif
 121
 122        buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 123        if (!buffer)
 124                return -ENOMEM;
 125
 126#ifdef DEBUG
 127        sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
 128#endif
 129        memset(&cgc, 0, sizeof(struct packet_command));
 130        cgc.cmd[0] = MODE_SELECT;
 131        cgc.cmd[1] = (1 << 4);
 132        cgc.cmd[4] = 12;
 133        modesel = (struct ccs_modesel_head *) buffer;
 134        memset(modesel, 0, sizeof(*modesel));
 135        modesel->block_desc_length = 0x08;
 136        modesel->density = density;
 137        modesel->block_length_med = (blocklength >> 8) & 0xff;
 138        modesel->block_length_lo = blocklength & 0xff;
 139        cgc.buffer = buffer;
 140        cgc.buflen = sizeof(*modesel);
 141        cgc.data_direction = DMA_TO_DEVICE;
 142        cgc.timeout = VENDOR_TIMEOUT;
 143        if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
 144                cd->device->sector_size = blocklength;
 145        }
 146#ifdef DEBUG
 147        else
 148                sr_printk(KERN_INFO, cd,
 149                          "switching blocklength to %d bytes failed\n",
 150                          blocklength);
 151#endif
 152        kfree(buffer);
 153        return rc;
 154}
 155
 156/* This function gets called after a media change. Checks if the CD is
 157   multisession, asks for offset etc. */
 158
 159int sr_cd_check(struct cdrom_device_info *cdi)
 160{
 161        Scsi_CD *cd = cdi->handle;
 162        unsigned long sector;
 163        unsigned char *buffer;  /* the buffer for the ioctl */
 164        struct packet_command cgc;
 165        int rc, no_multi;
 166
 167        if (cd->cdi.mask & CDC_MULTI_SESSION)
 168                return 0;
 169
 170        buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 171        if (!buffer)
 172                return -ENOMEM;
 173
 174        sector = 0;             /* the multisession sector offset goes here  */
 175        no_multi = 0;           /* flag: the drive can't handle multisession */
 176        rc = 0;
 177
 178        memset(&cgc, 0, sizeof(struct packet_command));
 179
 180        switch (cd->vendor) {
 181
 182        case VENDOR_SCSI3:
 183                cgc.cmd[0] = READ_TOC;
 184                cgc.cmd[8] = 12;
 185                cgc.cmd[9] = 0x40;
 186                cgc.buffer = buffer;
 187                cgc.buflen = 12;
 188                cgc.quiet = 1;
 189                cgc.data_direction = DMA_FROM_DEVICE;
 190                cgc.timeout = VENDOR_TIMEOUT;
 191                rc = sr_do_ioctl(cd, &cgc);
 192                if (rc != 0)
 193                        break;
 194                if ((buffer[0] << 8) + buffer[1] < 0x0a) {
 195                        sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
 196                           "doesn't support multisession CD's\n");
 197                        no_multi = 1;
 198                        break;
 199                }
 200                sector = buffer[11] + (buffer[10] << 8) +
 201                    (buffer[9] << 16) + (buffer[8] << 24);
 202                if (buffer[6] <= 1) {
 203                        /* ignore sector offsets from first track */
 204                        sector = 0;
 205                }
 206                break;
 207
 208#ifdef CONFIG_BLK_DEV_SR_VENDOR
 209        case VENDOR_NEC:{
 210                        unsigned long min, sec, frame;
 211                        cgc.cmd[0] = 0xde;
 212                        cgc.cmd[1] = 0x03;
 213                        cgc.cmd[2] = 0xb0;
 214                        cgc.buffer = buffer;
 215                        cgc.buflen = 0x16;
 216                        cgc.quiet = 1;
 217                        cgc.data_direction = DMA_FROM_DEVICE;
 218                        cgc.timeout = VENDOR_TIMEOUT;
 219                        rc = sr_do_ioctl(cd, &cgc);
 220                        if (rc != 0)
 221                                break;
 222                        if (buffer[14] != 0 && buffer[14] != 0xb0) {
 223                                sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
 224                                          "doesn't support multisession CD's\n");
 225
 226                                no_multi = 1;
 227                                break;
 228                        }
 229                        min = bcd2bin(buffer[15]);
 230                        sec = bcd2bin(buffer[16]);
 231                        frame = bcd2bin(buffer[17]);
 232                        sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 233                        break;
 234                }
 235
 236        case VENDOR_TOSHIBA:{
 237                        unsigned long min, sec, frame;
 238
 239                        /* we request some disc information (is it a XA-CD ?,
 240                         * where starts the last session ?) */
 241                        cgc.cmd[0] = 0xc7;
 242                        cgc.cmd[1] = 0x03;
 243                        cgc.buffer = buffer;
 244                        cgc.buflen = 4;
 245                        cgc.quiet = 1;
 246                        cgc.data_direction = DMA_FROM_DEVICE;
 247                        cgc.timeout = VENDOR_TIMEOUT;
 248                        rc = sr_do_ioctl(cd, &cgc);
 249                        if (rc == -EINVAL) {
 250                                sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
 251                                          "doesn't support multisession CD's\n");
 252                                no_multi = 1;
 253                                break;
 254                        }
 255                        if (rc != 0)
 256                                break;
 257                        min = bcd2bin(buffer[1]);
 258                        sec = bcd2bin(buffer[2]);
 259                        frame = bcd2bin(buffer[3]);
 260                        sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 261                        if (sector)
 262                                sector -= CD_MSF_OFFSET;
 263                        sr_set_blocklength(cd, 2048);
 264                        break;
 265                }
 266
 267        case VENDOR_WRITER:
 268                cgc.cmd[0] = READ_TOC;
 269                cgc.cmd[8] = 0x04;
 270                cgc.cmd[9] = 0x40;
 271                cgc.buffer = buffer;
 272                cgc.buflen = 0x04;
 273                cgc.quiet = 1;
 274                cgc.data_direction = DMA_FROM_DEVICE;
 275                cgc.timeout = VENDOR_TIMEOUT;
 276                rc = sr_do_ioctl(cd, &cgc);
 277                if (rc != 0) {
 278                        break;
 279                }
 280                if ((rc = buffer[2]) == 0) {
 281                        sr_printk(KERN_WARNING, cd,
 282                                  "No finished session\n");
 283                        break;
 284                }
 285                cgc.cmd[0] = READ_TOC;  /* Read TOC */
 286                cgc.cmd[6] = rc & 0x7f; /* number of last session */
 287                cgc.cmd[8] = 0x0c;
 288                cgc.cmd[9] = 0x40;
 289                cgc.buffer = buffer;
 290                cgc.buflen = 12;
 291                cgc.quiet = 1;
 292                cgc.data_direction = DMA_FROM_DEVICE;
 293                cgc.timeout = VENDOR_TIMEOUT;
 294                rc = sr_do_ioctl(cd, &cgc);
 295                if (rc != 0) {
 296                        break;
 297                }
 298                sector = buffer[11] + (buffer[10] << 8) +
 299                    (buffer[9] << 16) + (buffer[8] << 24);
 300                break;
 301#endif                          /* CONFIG_BLK_DEV_SR_VENDOR */
 302
 303        default:
 304                /* should not happen */
 305                sr_printk(KERN_WARNING, cd,
 306                          "unknown vendor code (%i), not initialized ?\n",
 307                          cd->vendor);
 308                sector = 0;
 309                no_multi = 1;
 310                break;
 311        }
 312        cd->ms_offset = sector;
 313        cd->xa_flag = 0;
 314        if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
 315                cd->xa_flag = 1;
 316
 317        if (2048 != cd->device->sector_size) {
 318                sr_set_blocklength(cd, 2048);
 319        }
 320        if (no_multi)
 321                cdi->mask |= CDC_MULTI_SESSION;
 322
 323#ifdef DEBUG
 324        if (sector)
 325                sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
 326                          sector);
 327#endif
 328        kfree(buffer);
 329        return rc;
 330}
 331