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