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