LXR linux-old/drivers/scsi/sr

   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/config.h>
  38#include <linux/errno.h>
  39#include <linux/string.h>
  40
  41#include <linux/blk.h>
  42#include "scsi.h"
  43#include "hosts.h"
  44#include <scsi/scsi_ioctl.h>
  45
  46#include <linux/cdrom.h>
  47#include "sr.h"
  48
  49#if 0
  50#define DEBUG
  51#endif
  52
  53/* here are some constants to sort the vendors into groups */
  54
  55#define VENDOR_SCSI3           1        /* default: scsi-3 mmc */
  56
  57#define VENDOR_NEC             2
  58#define VENDOR_TOSHIBA         3
  59#define VENDOR_WRITER          4        /* pre-scsi3 writers */
  60
  61#define VENDOR_ID (scsi_CDs[minor].vendor)
  62
  63void sr_vendor_init(int minor)
  64{
  65#ifndef CONFIG_BLK_DEV_SR_VENDOR
  66        VENDOR_ID = VENDOR_SCSI3;
  67#else
  68        char *vendor = scsi_CDs[minor].device->vendor;
  69        char *model = scsi_CDs[minor].device->model;
  70
  71        /* default */
  72        VENDOR_ID = VENDOR_SCSI3;
  73        if (scsi_CDs[minor].readcd_known)
  74                /* this is true for scsi3/mmc drives - no more checks */
  75                return;
  76
  77        if (scsi_CDs[minor].device->type == TYPE_WORM) {
  78                VENDOR_ID = VENDOR_WRITER;
  79
  80        } else if (!strncmp(vendor, "NEC", 3)) {
  81                VENDOR_ID = VENDOR_NEC;
  82                if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
  83                    !strncmp(model, "CD-ROM DRIVE:36", 15) ||
  84                    !strncmp(model, "CD-ROM DRIVE:83", 15) ||
  85                    !strncmp(model, "CD-ROM DRIVE:84 ", 16)
  86#if 0
  87                /* my NEC 3x returns the read-raw data if a read-raw
  88                   is followed by a read for the same sector - aeb */
  89                    || !strncmp(model, "CD-ROM DRIVE:500", 16)
  90#endif
  91                    )
  92                        /* these can't handle multisession, may hang */
  93                        scsi_CDs[minor].cdi.mask |= CDC_MULTI_SESSION;
  94
  95        } else if (!strncmp(vendor, "TOSHIBA", 7)) {
  96                VENDOR_ID = VENDOR_TOSHIBA;
  97
  98        }
  99#endif
 100}
 101
 102
 103/* small handy function for switching block length using MODE SELECT,
 104 * used by sr_read_sector() */
 105
 106int sr_set_blocklength(int minor, int blocklength)
 107{
 108        unsigned char *buffer;  /* the buffer for the ioctl */
 109        unsigned char cmd[MAX_COMMAND_SIZE];    /* the scsi-command */
 110        struct ccs_modesel_head *modesel;
 111        int rc, density = 0;
 112
 113#ifdef CONFIG_BLK_DEV_SR_VENDOR
 114        if (VENDOR_ID == VENDOR_TOSHIBA)
 115                density = (blocklength > 2048) ? 0x81 : 0x83;
 116#endif
 117
 118        buffer = (unsigned char *) scsi_malloc(512);
 119        if (!buffer)
 120                return -ENOMEM;
 121
 122#ifdef DEBUG
 123        printk("sr%d: MODE SELECT 0x%x/%d\n", minor, density, blocklength);
 124#endif
 125        memset(cmd, 0, MAX_COMMAND_SIZE);
 126        cmd[0] = MODE_SELECT;
 127        cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
 128                 (scsi_CDs[minor].device->lun << 5) : 0;
 129        cmd[1] |= (1 << 4);
 130        cmd[4] = 12;
 131        modesel = (struct ccs_modesel_head *) buffer;
 132        memset(modesel, 0, sizeof(*modesel));
 133        modesel->block_desc_length = 0x08;
 134        modesel->density = density;
 135        modesel->block_length_med = (blocklength >> 8) & 0xff;
 136        modesel->block_length_lo = blocklength & 0xff;
 137        if (0 == (rc = sr_do_ioctl(minor, cmd, buffer, sizeof(*modesel), 0, SCSI_DATA_WRITE, NULL))) {
 138                scsi_CDs[minor].device->sector_size = blocklength;
 139        }
 140#ifdef DEBUG
 141        else
 142                printk("sr%d: switching blocklength to %d bytes failed\n",
 143                       minor, blocklength);
 144#endif
 145        scsi_free(buffer, 512);
 146        return rc;
 147}
 148
 149/* This function gets called after a media change. Checks if the CD is
 150   multisession, asks for offset etc. */
 151
 152#define BCD_TO_BIN(x)    ((((int)x & 0xf0) >> 4)*10 + ((int)x & 0x0f))
 153
 154int sr_cd_check(struct cdrom_device_info *cdi)
 155{
 156        unsigned long sector;
 157        unsigned char *buffer;  /* the buffer for the ioctl */
 158        unsigned char cmd[MAX_COMMAND_SIZE];    /* the scsi-command */
 159        int rc, no_multi, minor;
 160
 161        minor = MINOR(cdi->dev);
 162        if (scsi_CDs[minor].cdi.mask & CDC_MULTI_SESSION)
 163                return 0;
 164
 165        buffer = (unsigned char *) scsi_malloc(512);
 166        if (!buffer)
 167                return -ENOMEM;
 168
 169        sector = 0;             /* the multisession sector offset goes here  */
 170        no_multi = 0;           /* flag: the drive can't handle multisession */
 171        rc = 0;
 172
 173        switch (VENDOR_ID) {
 174
 175        case VENDOR_SCSI3:
 176                memset(cmd, 0, MAX_COMMAND_SIZE);
 177                cmd[0] = READ_TOC;
 178                cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
 179                         (scsi_CDs[minor].device->lun << 5) : 0;
 180                cmd[8] = 12;
 181                cmd[9] = 0x40;
 182                rc = sr_do_ioctl(minor, cmd, buffer, 12, 1, SCSI_DATA_READ, NULL);
 183                if (rc != 0)
 184                        break;
 185                if ((buffer[0] << 8) + buffer[1] < 0x0a) {
 186                        printk(KERN_INFO "sr%d: Hmm, seems the drive "
 187                           "doesn't support multisession CD's\n", minor);
 188                        no_multi = 1;
 189                        break;
 190                }
 191                sector = buffer[11] + (buffer[10] << 8) +
 192                    (buffer[9] << 16) + (buffer[8] << 24);
 193                if (buffer[6] <= 1) {
 194                        /* ignore sector offsets from first track */
 195                        sector = 0;
 196                }
 197                break;
 198
 199#ifdef CONFIG_BLK_DEV_SR_VENDOR
 200        case VENDOR_NEC:{
 201                        unsigned long min, sec, frame;
 202                        memset(cmd, 0, MAX_COMMAND_SIZE);
 203                        cmd[0] = 0xde;
 204                        cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
 205                                 (scsi_CDs[minor].device->lun << 5) : 0;
 206                        cmd[1] |= 0x03;
 207                        cmd[2] = 0xb0;
 208                        rc = sr_do_ioctl(minor, cmd, buffer, 0x16, 1, SCSI_DATA_READ, NULL);
 209                        if (rc != 0)
 210                                break;
 211                        if (buffer[14] != 0 && buffer[14] != 0xb0) {
 212                                printk(KERN_INFO "sr%d: Hmm, seems the cdrom "
 213                                       "doesn't support multisession CD's\n", minor);
 214                                no_multi = 1;
 215                                break;
 216                        }
 217                        min = BCD_TO_BIN(buffer[15]);
 218                        sec = BCD_TO_BIN(buffer[16]);
 219                        frame = BCD_TO_BIN(buffer[17]);
 220                        sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 221                        break;
 222                }
 223
 224        case VENDOR_TOSHIBA:{
 225                        unsigned long min, sec, frame;
 226
 227                        /* we request some disc information (is it a XA-CD ?,
 228                         * where starts the last session ?) */
 229                        memset(cmd, 0, MAX_COMMAND_SIZE);
 230                        cmd[0] = 0xc7;
 231                        cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
 232                                 (scsi_CDs[minor].device->lun << 5) : 0;
 233                        cmd[1] |= 0x03;
 234                        rc = sr_do_ioctl(minor, cmd, buffer, 4, 1, SCSI_DATA_READ, NULL);
 235                        if (rc == -EINVAL) {
 236                                printk(KERN_INFO "sr%d: Hmm, seems the drive "
 237                                       "doesn't support multisession CD's\n", minor);
 238                                no_multi = 1;
 239                                break;
 240                        }
 241                        if (rc != 0)
 242                                break;
 243                        min = BCD_TO_BIN(buffer[1]);
 244                        sec = BCD_TO_BIN(buffer[2]);
 245                        frame = BCD_TO_BIN(buffer[3]);
 246                        sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
 247                        if (sector)
 248                                sector -= CD_MSF_OFFSET;
 249                        sr_set_blocklength(minor, 2048);
 250                        break;
 251                }
 252
 253        case VENDOR_WRITER:
 254                memset(cmd, 0, MAX_COMMAND_SIZE);
 255                cmd[0] = READ_TOC;
 256                cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
 257                         (scsi_CDs[minor].device->lun << 5) : 0;
 258                cmd[8] = 0x04;
 259                cmd[9] = 0x40;
 260                rc = sr_do_ioctl(minor, cmd, buffer, 0x04, 1, SCSI_DATA_READ, NULL);
 261                if (rc != 0) {
 262                        break;
 263                }
 264                if ((rc = buffer[2]) == 0) {
 265                        printk(KERN_WARNING
 266                               "sr%d: No finished session\n", minor);
 267                        break;
 268                }
 269                cmd[0] = READ_TOC;      /* Read TOC */
 270                cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
 271                         (scsi_CDs[minor].device->lun << 5) : 0;
 272                cmd[6] = rc & 0x7f;     /* number of last session */
 273                cmd[8] = 0x0c;
 274                cmd[9] = 0x40;
 275                rc = sr_do_ioctl(minor, cmd, buffer, 12, 1, SCSI_DATA_READ, NULL);
 276                if (rc != 0) {
 277                        break;
 278                }
 279                sector = buffer[11] + (buffer[10] << 8) +
 280                    (buffer[9] << 16) + (buffer[8] << 24);
 281                break;
 282#endif                          /* CONFIG_BLK_DEV_SR_VENDOR */
 283
 284        default:
 285                /* should not happen */
 286                printk(KERN_WARNING
 287                   "sr%d: unknown vendor code (%i), not initialized ?\n",
 288                       minor, VENDOR_ID);
 289                sector = 0;
 290                no_multi = 1;
 291                break;
 292        }
 293        scsi_CDs[minor].ms_offset = sector;
 294        scsi_CDs[minor].xa_flag = 0;
 295        if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(minor))
 296                scsi_CDs[minor].xa_flag = 1;
 297
 298        if (2048 != scsi_CDs[minor].device->sector_size) {
 299                sr_set_blocklength(minor, 2048);
 300        }
 301        if (no_multi)
 302                cdi->mask |= CDC_MULTI_SESSION;
 303
 304#ifdef DEBUG
 305        if (sector)
 306                printk(KERN_DEBUG "sr%d: multisession offset=%lu\n",
 307                       minor, sector);
 308#endif
 309        scsi_free(buffer, 512);
 310        return rc;
 311}
 312