drivers/scsi/sr

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This source file includes following definitions.
sr_vendor_init
sr_set_blocklength
sr_cd_check
   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 #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 
 110 int 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 
 159 int 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 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/scsi/sr_vendor.c

DEFINITIONS
