drivers/scsi/sr_vendor.c

   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
  67 void sr_vendor_init(Scsi_CD *cd)
  68 {
  69         const char *vendor = cd->device->vendor;
  70         const char *model = cd->device->model;
  71
  72         /* default */
  73         cd->vendor = VENDOR_SCSI3;
  74         if (cd->readcd_known)
  75                 /* this is true for scsi3/mmc drives - no more checks */
  76                 return;
  77
  78         if (cd->device->type == TYPE_WORM) {
  79                 cd->vendor = VENDOR_WRITER;
  80
  81         } else if (!strncmp(vendor, "NEC", 3)) {
  82                 cd->vendor = VENDOR_NEC;
  83                 if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
  84                     !strncmp(model, "CD-ROM DRIVE:36", 15) ||
  85                     !strncmp(model, "CD-ROM DRIVE:83", 15) ||
  86                     !strncmp(model, "CD-ROM DRIVE:84 ", 16)
  87 #if 0
  88                 /* my NEC 3x returns the read-raw data if a read-raw
  89                    is followed by a read for the same sector - aeb */
  90                     || !strncmp(model, "CD-ROM DRIVE:500", 16)
  91 #endif
  92                     )
  93                         /* these can't handle multisession, may hang */
  94                         cd->cdi.mask |= CDC_MULTI_SESSION;
  95
  96         } else if (!strncmp(vendor, "TOSHIBA", 7)) {
  97                 cd->vendor = VENDOR_TOSHIBA;
  98
  99         }
 100 }
 101
 102
 103 /* small handy function for switching block length using MODE SELECT,
 104  * used by sr_read_sector() */
 105
 106 int sr_set_blocklength(Scsi_CD *cd, int blocklength)
 107 {
 108         unsigned char *buffer;  /* the buffer for the ioctl */
 109         struct packet_command cgc;
 110         struct ccs_modesel_head *modesel;
 111         int rc, density = 0;
 112
 113         if (cd->vendor == VENDOR_TOSHIBA)
 114                 density = (blocklength > 2048) ? 0x81 : 0x83;
 115
 116         buffer = kmalloc(512, GFP_KERNEL);
 117         if (!buffer)
 118                 return -ENOMEM;
 119
 120 #ifdef DEBUG
 121         sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
 122 #endif
 123         memset(&cgc, 0, sizeof(struct packet_command));
 124         cgc.cmd[0] = MODE_SELECT;
 125         cgc.cmd[1] = (1 << 4);
 126         cgc.cmd[4] = 12;
 127         modesel = (struct ccs_modesel_head *) buffer;
 128         memset(modesel, 0, sizeof(*modesel));
 129         modesel->block_desc_length = 0x08;
 130         modesel->density = density;
 131         modesel->block_length_med = (blocklength >> 8) & 0xff;
 132         modesel->block_length_lo = blocklength & 0xff;
 133         cgc.buffer = buffer;
 134         cgc.buflen = sizeof(*modesel);
 135         cgc.data_direction = DMA_TO_DEVICE;
 136         cgc.timeout = VENDOR_TIMEOUT;
 137         if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
 138                 cd->device->sector_size = blocklength;
 139         }
 140 #ifdef DEBUG
 141         else
 142                 sr_printk(KERN_INFO, cd,
 143                           "switching blocklength to %d bytes failed\n",
 144                           blocklength);
 145 #endif
 146         kfree(buffer);
 147         return rc;
 148 }
 149
 150 /* This function gets called after a media change. Checks if the CD is
 151    multisession, asks for offset etc. */
 152
 153 int sr_cd_check(struct cdrom_device_info *cdi)
 154 {
 155         Scsi_CD *cd = cdi->handle;
 156         unsigned long sector;
 157         unsigned char *buffer;  /* the buffer for the ioctl */
 158         struct packet_command cgc;
 159         int rc, no_multi;
 160
 161         if (cd->cdi.mask & CDC_MULTI_SESSION)
 162                 return 0;
 163
 164         buffer = kmalloc(512, GFP_KERNEL);
 165         if (!buffer)
 166                 return -ENOMEM;
 167
 168         sector = 0;             /* the multisession sector offset goes here  */
 169         no_multi = 0;           /* flag: the drive can't handle multisession */
 170         rc = 0;
 171
 172         memset(&cgc, 0, sizeof(struct packet_command));
 173
 174         switch (cd->vendor) {
 175
 176         case VENDOR_SCSI3:
 177                 cgc.cmd[0] = READ_TOC;
 178                 cgc.cmd[8] = 12;
 179                 cgc.cmd[9] = 0x40;
 180                 cgc.buffer = buffer;
 181                 cgc.buflen = 12;
 182                 cgc.quiet = 1;
 183                 cgc.data_direction = DMA_FROM_DEVICE;
 184                 cgc.timeout = VENDOR_TIMEOUT;
 185                 rc = sr_do_ioctl(cd, &cgc);
 186                 if (rc != 0)
 187                         break;
 188                 if ((buffer[0] << 8) + buffer[1] < 0x0a) {
 189                         sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
 190                            "doesn't support multisession CD's\n");
 191                         no_multi = 1;
 192                         break;
 193                 }
 194                 sector = buffer[11] + (buffer[10] << 8) +
 195                     (buffer[9] << 16) + (buffer[8] << 24);
 196                 if (buffer[6] <= 1) {
 197                         /* ignore sector offsets from first track */
 198                         sector = 0;
 199                 }
 200                 break;
 201
 202         case VENDOR_NEC:{
 203                         unsigned long min, sec, frame;
 204                         cgc.cmd[0] = 0xde;
 205                         cgc.cmd[1] = 0x03;
 206                         cgc.cmd[2] = 0xb0;
 207                         cgc.buffer = buffer;
 208                         cgc.buflen = 0x16;
 209                         cgc.quiet = 1;
 210                         cgc.data_direction = DMA_FROM_DEVICE;
 211                         cgc.timeout = VENDOR_TIMEOUT;
 212                         rc = sr_do_ioctl(cd, &cgc);
 213                         if (rc != 0)
 214                                 break;
 215                         if (buffer[14] != 0 && buffer[14] != 0xb0) {
 216                                 sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
 217                                           "doesn't support multisession CD's\n");
 218
 219                                 no_multi = 1;
 220                                 break;
 221                         }
 222                         min = bcd2bin(buffer[15]);
 223                         sec = bcd2bin(buffer[16]);
 224                         frame = bcd2bin(buffer[17]);
 225                         sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 226                         break;
 227                 }
 228
 229         case VENDOR_TOSHIBA:{
 230                         unsigned long min, sec, frame;
 231
 232                         /* we request some disc information (is it a XA-CD ?,
 233                          * where starts the last session ?) */
 234                         cgc.cmd[0] = 0xc7;
 235                         cgc.cmd[1] = 0x03;
 236                         cgc.buffer = buffer;
 237                         cgc.buflen = 4;
 238                         cgc.quiet = 1;
 239                         cgc.data_direction = DMA_FROM_DEVICE;
 240                         cgc.timeout = VENDOR_TIMEOUT;
 241                         rc = sr_do_ioctl(cd, &cgc);
 242                         if (rc == -EINVAL) {
 243                                 sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
 244                                           "doesn't support multisession CD's\n");
 245                                 no_multi = 1;
 246                                 break;
 247                         }
 248                         if (rc != 0)
 249                                 break;
 250                         min = bcd2bin(buffer[1]);
 251                         sec = bcd2bin(buffer[2]);
 252                         frame = bcd2bin(buffer[3]);
 253                         sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 254                         if (sector)
 255                                 sector -= CD_MSF_OFFSET;
 256                         sr_set_blocklength(cd, 2048);
 257                         break;
 258                 }
 259
 260         case VENDOR_WRITER:
 261                 cgc.cmd[0] = READ_TOC;
 262                 cgc.cmd[8] = 0x04;
 263                 cgc.cmd[9] = 0x40;
 264                 cgc.buffer = buffer;
 265                 cgc.buflen = 0x04;
 266                 cgc.quiet = 1;
 267                 cgc.data_direction = DMA_FROM_DEVICE;
 268                 cgc.timeout = VENDOR_TIMEOUT;
 269                 rc = sr_do_ioctl(cd, &cgc);
 270                 if (rc != 0) {
 271                         break;
 272                 }
 273                 if ((rc = buffer[2]) == 0) {
 274                         sr_printk(KERN_WARNING, cd,
 275                                   "No finished session\n");
 276                         break;
 277                 }
 278                 cgc.cmd[0] = READ_TOC;  /* Read TOC */
 279                 cgc.cmd[6] = rc & 0x7f; /* number of last session */
 280                 cgc.cmd[8] = 0x0c;
 281                 cgc.cmd[9] = 0x40;
 282                 cgc.buffer = buffer;
 283                 cgc.buflen = 12;
 284                 cgc.quiet = 1;
 285                 cgc.data_direction = DMA_FROM_DEVICE;
 286                 cgc.timeout = VENDOR_TIMEOUT;
 287                 rc = sr_do_ioctl(cd, &cgc);
 288                 if (rc != 0) {
 289                         break;
 290                 }
 291                 sector = buffer[11] + (buffer[10] << 8) +
 292                     (buffer[9] << 16) + (buffer[8] << 24);
 293                 break;
 294
 295         default:
 296                 /* should not happen */
 297                 sr_printk(KERN_WARNING, cd,
 298                           "unknown vendor code (%i), not initialized ?\n",
 299                           cd->vendor);
 300                 sector = 0;
 301                 no_multi = 1;
 302                 break;
 303         }
 304         cd->ms_offset = sector;
 305         cd->xa_flag = 0;
 306         if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
 307                 cd->xa_flag = 1;
 308
 309         if (2048 != cd->device->sector_size) {
 310                 sr_set_blocklength(cd, 2048);
 311         }
 312         if (no_multi)
 313                 cdi->mask |= CDC_MULTI_SESSION;
 314
 315 #ifdef DEBUG
 316         if (sector)
 317                 sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
 318                           sector);
 319 #endif
 320         kfree(buffer);
 321         return rc;
 322 }