1 /* 2 * sr.c Copyright (C) 1992 David Giller 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * adapted from: 6 * sd.c Copyright (C) 1992 Drew Eckhardt 7 * Linux scsi disk driver by 8 * Drew Eckhardt <drew@colorado.edu> 9 * 10 * Modified by Eric Youngdale ericy@andante.org to 11 * add scatter-gather, multiple outstanding request, and other 12 * enhancements. 13 * 14 * Modified by Eric Youngdale eric@andante.org to support loadable 15 * low-level scsi drivers. 16 * 17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to 18 * provide auto-eject. 19 * 20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the 21 * generic cdrom interface 22 * 23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() 24 * interface, capabilities probe additions, ioctl cleanups, etc. 25 * 26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs 27 * 28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM 29 * transparently and lose the GHOST hack 30 * 31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 32 * check resource allocation in sr_init and some cleanups 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/string.h> 41 #include <linux/errno.h> 42 #include <linux/cdrom.h> 43 #include <linux/interrupt.h> 44 #include <linux/init.h> 45 #include <linux/blkdev.h> 46 #include <linux/mutex.h> 47 #include <asm/uaccess.h> 48 49 #include <scsi/scsi.h> 50 #include <scsi/scsi_dbg.h> 51 #include <scsi/scsi_device.h> 52 #include <scsi/scsi_driver.h> 53 #include <scsi/scsi_cmnd.h> 54 #include <scsi/scsi_eh.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 57 58 #include "scsi_logging.h" 59 #include "sr.h" 60 61 62 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 63 MODULE_LICENSE("GPL"); 64 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 65 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 66 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 67 68 #define SR_DISKS 256 69 70 #define SR_CAPABILITIES \ 71 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 72 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 73 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 74 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 75 CDC_MRW|CDC_MRW_W|CDC_RAM) 76 77 static int sr_probe(struct device *); 78 static int sr_remove(struct device *); 79 static int sr_done(struct scsi_cmnd *); 80 81 static struct scsi_driver sr_template = { 82 .owner = THIS_MODULE, 83 .gendrv = { 84 .name = "sr", 85 .probe = sr_probe, 86 .remove = sr_remove, 87 }, 88 .done = sr_done, 89 }; 90 91 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 92 static DEFINE_SPINLOCK(sr_index_lock); 93 94 /* This semaphore is used to mediate the 0->1 reference get in the 95 * face of object destruction (i.e. we can't allow a get on an 96 * object after last put) */ 97 static DEFINE_MUTEX(sr_ref_mutex); 98 99 static int sr_open(struct cdrom_device_info *, int); 100 static void sr_release(struct cdrom_device_info *); 101 102 static void get_sectorsize(struct scsi_cd *); 103 static void get_capabilities(struct scsi_cd *); 104 105 static int sr_media_change(struct cdrom_device_info *, int); 106 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 107 108 static struct cdrom_device_ops sr_dops = { 109 .open = sr_open, 110 .release = sr_release, 111 .drive_status = sr_drive_status, 112 .media_changed = sr_media_change, 113 .tray_move = sr_tray_move, 114 .lock_door = sr_lock_door, 115 .select_speed = sr_select_speed, 116 .get_last_session = sr_get_last_session, 117 .get_mcn = sr_get_mcn, 118 .reset = sr_reset, 119 .audio_ioctl = sr_audio_ioctl, 120 .capability = SR_CAPABILITIES, 121 .generic_packet = sr_packet, 122 }; 123 124 static void sr_kref_release(struct kref *kref); 125 126 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 127 { 128 return container_of(disk->private_data, struct scsi_cd, driver); 129 } 130 131 /* 132 * The get and put routines for the struct scsi_cd. Note this entity 133 * has a scsi_device pointer and owns a reference to this. 134 */ 135 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 136 { 137 struct scsi_cd *cd = NULL; 138 139 mutex_lock(&sr_ref_mutex); 140 if (disk->private_data == NULL) 141 goto out; 142 cd = scsi_cd(disk); 143 kref_get(&cd->kref); 144 if (scsi_device_get(cd->device)) 145 goto out_put; 146 goto out; 147 148 out_put: 149 kref_put(&cd->kref, sr_kref_release); 150 cd = NULL; 151 out: 152 mutex_unlock(&sr_ref_mutex); 153 return cd; 154 } 155 156 static void scsi_cd_put(struct scsi_cd *cd) 157 { 158 struct scsi_device *sdev = cd->device; 159 160 mutex_lock(&sr_ref_mutex); 161 kref_put(&cd->kref, sr_kref_release); 162 scsi_device_put(sdev); 163 mutex_unlock(&sr_ref_mutex); 164 } 165 166 /* 167 * This function checks to see if the media has been changed in the 168 * CDROM drive. It is possible that we have already sensed a change, 169 * or the drive may have sensed one and not yet reported it. We must 170 * be ready for either case. This function always reports the current 171 * value of the changed bit. If flag is 0, then the changed bit is reset. 172 * This function could be done as an ioctl, but we would need to have 173 * an inode for that to work, and we do not always have one. 174 */ 175 176 static int sr_media_change(struct cdrom_device_info *cdi, int slot) 177 { 178 struct scsi_cd *cd = cdi->handle; 179 int retval; 180 struct scsi_sense_hdr *sshdr; 181 182 if (CDSL_CURRENT != slot) { 183 /* no changer support */ 184 return -EINVAL; 185 } 186 187 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 188 retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, 189 sshdr); 190 if (retval || (scsi_sense_valid(sshdr) && 191 /* 0x3a is medium not present */ 192 sshdr->asc == 0x3a)) { 193 /* Media not present or unable to test, unit probably not 194 * ready. This usually means there is no disc in the drive. 195 * Mark as changed, and we will figure it out later once 196 * the drive is available again. 197 */ 198 cd->device->changed = 1; 199 /* This will force a flush, if called from check_disk_change */ 200 retval = 1; 201 goto out; 202 }; 203 204 retval = cd->device->changed; 205 cd->device->changed = 0; 206 /* If the disk changed, the capacity will now be different, 207 * so we force a re-read of this information */ 208 if (retval) { 209 /* check multisession offset etc */ 210 sr_cd_check(cdi); 211 get_sectorsize(cd); 212 } 213 214 out: 215 /* Notify userspace, that media has changed. */ 216 if (retval != cd->previous_state) 217 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, 218 GFP_KERNEL); 219 cd->previous_state = retval; 220 kfree(sshdr); 221 222 return retval; 223 } 224 225 /* 226 * sr_done is the interrupt routine for the device driver. 227 * 228 * It will be notified on the end of a SCSI read / write, and will take one 229 * of several actions based on success or failure. 230 */ 231 static int sr_done(struct scsi_cmnd *SCpnt) 232 { 233 int result = SCpnt->result; 234 int this_count = scsi_bufflen(SCpnt); 235 int good_bytes = (result == 0 ? this_count : 0); 236 int block_sectors = 0; 237 long error_sector; 238 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 239 240 #ifdef DEBUG 241 printk("sr.c done: %x\n", result); 242 #endif 243 244 /* 245 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 246 * success. Since this is a relatively rare error condition, no 247 * care is taken to avoid unnecessary additional work such as 248 * memcpy's that could be avoided. 249 */ 250 if (driver_byte(result) != 0 && /* An error occurred */ 251 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 252 switch (SCpnt->sense_buffer[2]) { 253 case MEDIUM_ERROR: 254 case VOLUME_OVERFLOW: 255 case ILLEGAL_REQUEST: 256 if (!(SCpnt->sense_buffer[0] & 0x90)) 257 break; 258 error_sector = (SCpnt->sense_buffer[3] << 24) | 259 (SCpnt->sense_buffer[4] << 16) | 260 (SCpnt->sense_buffer[5] << 8) | 261 SCpnt->sense_buffer[6]; 262 if (SCpnt->request->bio != NULL) 263 block_sectors = 264 bio_sectors(SCpnt->request->bio); 265 if (block_sectors < 4) 266 block_sectors = 4; 267 if (cd->device->sector_size == 2048) 268 error_sector <<= 2; 269 error_sector &= ~(block_sectors - 1); 270 good_bytes = (error_sector - SCpnt->request->sector) << 9; 271 if (good_bytes < 0 || good_bytes >= this_count) 272 good_bytes = 0; 273 /* 274 * The SCSI specification allows for the value 275 * returned by READ CAPACITY to be up to 75 2K 276 * sectors past the last readable block. 277 * Therefore, if we hit a medium error within the 278 * last 75 2K sectors, we decrease the saved size 279 * value. 280 */ 281 if (error_sector < get_capacity(cd->disk) && 282 cd->capacity - error_sector < 4 * 75) 283 set_capacity(cd->disk, error_sector); 284 break; 285 286 case RECOVERED_ERROR: 287 288 /* 289 * An error occured, but it recovered. Inform the 290 * user, but make sure that it's not treated as a 291 * hard error. 292 */ 293 scsi_print_sense("sr", SCpnt); 294 SCpnt->result = 0; 295 SCpnt->sense_buffer[0] = 0x0; 296 good_bytes = this_count; 297 break; 298 299 default: 300 break; 301 } 302 } 303 304 return good_bytes; 305 } 306 307 static int sr_prep_fn(struct request_queue *q, struct request *rq) 308 { 309 int block=0, this_count, s_size, timeout = SR_TIMEOUT; 310 struct scsi_cd *cd; 311 struct scsi_cmnd *SCpnt; 312 struct scsi_device *sdp = q->queuedata; 313 int ret; 314 315 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 316 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 317 goto out; 318 } else if (rq->cmd_type != REQ_TYPE_FS) { 319 ret = BLKPREP_KILL; 320 goto out; 321 } 322 ret = scsi_setup_fs_cmnd(sdp, rq); 323 if (ret != BLKPREP_OK) 324 goto out; 325 SCpnt = rq->special; 326 cd = scsi_cd(rq->rq_disk); 327 328 /* from here on until we're complete, any goto out 329 * is used for a killable error condition */ 330 ret = BLKPREP_KILL; 331 332 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 333 cd->disk->disk_name, block)); 334 335 if (!cd->device || !scsi_device_online(cd->device)) { 336 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", 337 rq->nr_sectors)); 338 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 339 goto out; 340 } 341 342 if (cd->device->changed) { 343 /* 344 * quietly refuse to do anything to a changed disc until the 345 * changed bit has been reset 346 */ 347 goto out; 348 } 349 350 /* 351 * we do lazy blocksize switching (when reading XA sectors, 352 * see CDROMREADMODE2 ioctl) 353 */ 354 s_size = cd->device->sector_size; 355 if (s_size > 2048) { 356 if (!in_interrupt()) 357 sr_set_blocklength(cd, 2048); 358 else 359 printk("sr: can't switch blocksize: in interrupt\n"); 360 } 361 362 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 363 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 364 goto out; 365 } 366 367 if (rq_data_dir(rq) == WRITE) { 368 if (!cd->device->writeable) 369 goto out; 370 SCpnt->cmnd[0] = WRITE_10; 371 SCpnt->sc_data_direction = DMA_TO_DEVICE; 372 cd->cdi.media_written = 1; 373 } else if (rq_data_dir(rq) == READ) { 374 SCpnt->cmnd[0] = READ_10; 375 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 376 } else { 377 blk_dump_rq_flags(rq, "Unknown sr command"); 378 goto out; 379 } 380 381 { 382 struct scatterlist *sg; 383 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 384 385 scsi_for_each_sg(SCpnt, sg, sg_count, i) 386 size += sg->length; 387 388 if (size != scsi_bufflen(SCpnt)) { 389 scmd_printk(KERN_ERR, SCpnt, 390 "mismatch count %d, bytes %d\n", 391 size, scsi_bufflen(SCpnt)); 392 if (scsi_bufflen(SCpnt) > size) 393 SCpnt->sdb.length = size; 394 } 395 } 396 397 /* 398 * request doesn't start on hw block boundary, add scatter pads 399 */ 400 if (((unsigned int)rq->sector % (s_size >> 9)) || 401 (scsi_bufflen(SCpnt) % s_size)) { 402 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 403 goto out; 404 } 405 406 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 407 408 409 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", 410 cd->cdi.name, 411 (rq_data_dir(rq) == WRITE) ? 412 "writing" : "reading", 413 this_count, rq->nr_sectors)); 414 415 SCpnt->cmnd[1] = 0; 416 block = (unsigned int)rq->sector / (s_size >> 9); 417 418 if (this_count > 0xffff) { 419 this_count = 0xffff; 420 SCpnt->sdb.length = this_count * s_size; 421 } 422 423 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 424 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 425 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 426 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 427 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 428 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 429 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 430 431 /* 432 * We shouldn't disconnect in the middle of a sector, so with a dumb 433 * host adapter, it's safe to assume that we can at least transfer 434 * this many bytes between each connect / disconnect. 435 */ 436 SCpnt->transfersize = cd->device->sector_size; 437 SCpnt->underflow = this_count << 9; 438 SCpnt->allowed = MAX_RETRIES; 439 SCpnt->timeout_per_command = timeout; 440 441 /* 442 * This indicates that the command is ready from our end to be 443 * queued. 444 */ 445 ret = BLKPREP_OK; 446 out: 447 return scsi_prep_return(q, rq, ret); 448 } 449 450 static int sr_block_open(struct inode *inode, struct file *file) 451 { 452 struct gendisk *disk = inode->i_bdev->bd_disk; 453 struct scsi_cd *cd; 454 int ret = 0; 455 456 if(!(cd = scsi_cd_get(disk))) 457 return -ENXIO; 458 459 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) 460 scsi_cd_put(cd); 461 462 return ret; 463 } 464 465 static int sr_block_release(struct inode *inode, struct file *file) 466 { 467 int ret; 468 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 469 ret = cdrom_release(&cd->cdi, file); 470 if(ret) 471 return ret; 472 473 scsi_cd_put(cd); 474 475 return 0; 476 } 477 478 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, 479 unsigned long arg) 480 { 481 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 482 struct scsi_device *sdev = cd->device; 483 void __user *argp = (void __user *)arg; 484 int ret; 485 486 /* 487 * Send SCSI addressing ioctls directly to mid level, send other 488 * ioctls to cdrom/block level. 489 */ 490 switch (cmd) { 491 case SCSI_IOCTL_GET_IDLUN: 492 case SCSI_IOCTL_GET_BUS_NUMBER: 493 return scsi_ioctl(sdev, cmd, argp); 494 } 495 496 ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); 497 if (ret != -ENOSYS) 498 return ret; 499 500 /* 501 * ENODEV means that we didn't recognise the ioctl, or that we 502 * cannot execute it in the current device state. In either 503 * case fall through to scsi_ioctl, which will return ENDOEV again 504 * if it doesn't recognise the ioctl 505 */ 506 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL); 507 if (ret != -ENODEV) 508 return ret; 509 return scsi_ioctl(sdev, cmd, argp); 510 } 511 512 static int sr_block_media_changed(struct gendisk *disk) 513 { 514 struct scsi_cd *cd = scsi_cd(disk); 515 return cdrom_media_changed(&cd->cdi); 516 } 517 518 static struct block_device_operations sr_bdops = 519 { 520 .owner = THIS_MODULE, 521 .open = sr_block_open, 522 .release = sr_block_release, 523 .ioctl = sr_block_ioctl, 524 .media_changed = sr_block_media_changed, 525 /* 526 * No compat_ioctl for now because sr_block_ioctl never 527 * seems to pass arbitary ioctls down to host drivers. 528 */ 529 }; 530 531 static int sr_open(struct cdrom_device_info *cdi, int purpose) 532 { 533 struct scsi_cd *cd = cdi->handle; 534 struct scsi_device *sdev = cd->device; 535 int retval; 536 537 /* 538 * If the device is in error recovery, wait until it is done. 539 * If the device is offline, then disallow any access to it. 540 */ 541 retval = -ENXIO; 542 if (!scsi_block_when_processing_errors(sdev)) 543 goto error_out; 544 545 return 0; 546 547 error_out: 548 return retval; 549 } 550 551 static void sr_release(struct cdrom_device_info *cdi) 552 { 553 struct scsi_cd *cd = cdi->handle; 554 555 if (cd->device->sector_size > 2048) 556 sr_set_blocklength(cd, 2048); 557 558 } 559 560 static int sr_probe(struct device *dev) 561 { 562 struct scsi_device *sdev = to_scsi_device(dev); 563 struct gendisk *disk; 564 struct scsi_cd *cd; 565 int minor, error; 566 567 error = -ENODEV; 568 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 569 goto fail; 570 571 error = -ENOMEM; 572 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 573 if (!cd) 574 goto fail; 575 576 kref_init(&cd->kref); 577 578 disk = alloc_disk(1); 579 if (!disk) 580 goto fail_free; 581 582 spin_lock(&sr_index_lock); 583 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 584 if (minor == SR_DISKS) { 585 spin_unlock(&sr_index_lock); 586 error = -EBUSY; 587 goto fail_put; 588 } 589 __set_bit(minor, sr_index_bits); 590 spin_unlock(&sr_index_lock); 591 592 disk->major = SCSI_CDROM_MAJOR; 593 disk->first_minor = minor; 594 sprintf(disk->disk_name, "sr%d", minor); 595 disk->fops = &sr_bdops; 596 disk->flags = GENHD_FL_CD; 597 598 cd->device = sdev; 599 cd->disk = disk; 600 cd->driver = &sr_template; 601 cd->disk = disk; 602 cd->capacity = 0x1fffff; 603 cd->device->changed = 1; /* force recheck CD type */ 604 cd->use = 1; 605 cd->readcd_known = 0; 606 cd->readcd_cdda = 0; 607 608 cd->cdi.ops = &sr_dops; 609 cd->cdi.handle = cd; 610 cd->cdi.mask = 0; 611 cd->cdi.capacity = 1; 612 sprintf(cd->cdi.name, "sr%d", minor); 613 614 sdev->sector_size = 2048; /* A guess, just in case */ 615 616 /* FIXME: need to handle a get_capabilities failure properly ?? */ 617 get_capabilities(cd); 618 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 619 sr_vendor_init(cd); 620 621 disk->driverfs_dev = &sdev->sdev_gendev; 622 set_capacity(disk, cd->capacity); 623 disk->private_data = &cd->driver; 624 disk->queue = sdev->request_queue; 625 cd->cdi.disk = disk; 626 627 if (register_cdrom(&cd->cdi)) 628 goto fail_put; 629 630 dev_set_drvdata(dev, cd); 631 disk->flags |= GENHD_FL_REMOVABLE; 632 add_disk(disk); 633 634 sdev_printk(KERN_DEBUG, sdev, 635 "Attached scsi CD-ROM %s\n", cd->cdi.name); 636 return 0; 637 638 fail_put: 639 put_disk(disk); 640 fail_free: 641 kfree(cd); 642 fail: 643 return error; 644 } 645 646 647 static void get_sectorsize(struct scsi_cd *cd) 648 { 649 unsigned char cmd[10]; 650 unsigned char *buffer; 651 int the_result, retries = 3; 652 int sector_size; 653 struct request_queue *queue; 654 655 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 656 if (!buffer) 657 goto Enomem; 658 659 do { 660 cmd[0] = READ_CAPACITY; 661 memset((void *) &cmd[1], 0, 9); 662 memset(buffer, 0, 8); 663 664 /* Do the command and wait.. */ 665 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 666 buffer, 8, NULL, SR_TIMEOUT, 667 MAX_RETRIES); 668 669 retries--; 670 671 } while (the_result && retries); 672 673 674 if (the_result) { 675 cd->capacity = 0x1fffff; 676 sector_size = 2048; /* A guess, just in case */ 677 } else { 678 #if 0 679 if (cdrom_get_last_written(&cd->cdi, 680 &cd->capacity)) 681 #endif 682 cd->capacity = 1 + ((buffer[0] << 24) | 683 (buffer[1] << 16) | 684 (buffer[2] << 8) | 685 buffer[3]); 686 sector_size = (buffer[4] << 24) | 687 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 688 switch (sector_size) { 689 /* 690 * HP 4020i CD-Recorder reports 2340 byte sectors 691 * Philips CD-Writers report 2352 byte sectors 692 * 693 * Use 2k sectors for them.. 694 */ 695 case 0: 696 case 2340: 697 case 2352: 698 sector_size = 2048; 699 /* fall through */ 700 case 2048: 701 cd->capacity *= 4; 702 /* fall through */ 703 case 512: 704 break; 705 default: 706 printk("%s: unsupported sector size %d.\n", 707 cd->cdi.name, sector_size); 708 cd->capacity = 0; 709 } 710 711 cd->device->sector_size = sector_size; 712 713 /* 714 * Add this so that we have the ability to correctly gauge 715 * what the device is capable of. 716 */ 717 set_capacity(cd->disk, cd->capacity); 718 } 719 720 queue = cd->device->request_queue; 721 blk_queue_hardsect_size(queue, sector_size); 722 out: 723 kfree(buffer); 724 return; 725 726 Enomem: 727 cd->capacity = 0x1fffff; 728 cd->device->sector_size = 2048; /* A guess, just in case */ 729 goto out; 730 } 731 732 static void get_capabilities(struct scsi_cd *cd) 733 { 734 unsigned char *buffer; 735 struct scsi_mode_data data; 736 unsigned char cmd[MAX_COMMAND_SIZE]; 737 struct scsi_sense_hdr sshdr; 738 unsigned int the_result; 739 int retries, rc, n; 740 741 static const char *loadmech[] = 742 { 743 "caddy", 744 "tray", 745 "pop-up", 746 "", 747 "changer", 748 "cartridge changer", 749 "", 750 "" 751 }; 752 753 754 /* allocate transfer buffer */ 755 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 756 if (!buffer) { 757 printk(KERN_ERR "sr: out of memory.\n"); 758 return; 759 } 760 761 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 762 * conditions are gone, or a timeout happens 763 */ 764 retries = 0; 765 do { 766 memset((void *)cmd, 0, MAX_COMMAND_SIZE); 767 cmd[0] = TEST_UNIT_READY; 768 769 the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL, 770 0, &sshdr, SR_TIMEOUT, 771 MAX_RETRIES); 772 773 retries++; 774 } while (retries < 5 && 775 (!scsi_status_is_good(the_result) || 776 (scsi_sense_valid(&sshdr) && 777 sshdr.sense_key == UNIT_ATTENTION))); 778 779 /* ask for mode page 0x2a */ 780 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 781 SR_TIMEOUT, 3, &data, NULL); 782 783 if (!scsi_status_is_good(rc)) { 784 /* failed, drive doesn't have capabilities mode page */ 785 cd->cdi.speed = 1; 786 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 787 CDC_DVD | CDC_DVD_RAM | 788 CDC_SELECT_DISC | CDC_SELECT_SPEED | 789 CDC_MRW | CDC_MRW_W | CDC_RAM); 790 kfree(buffer); 791 printk("%s: scsi-1 drive\n", cd->cdi.name); 792 return; 793 } 794 795 n = data.header_length + data.block_descriptor_length; 796 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 797 cd->readcd_known = 1; 798 cd->readcd_cdda = buffer[n + 5] & 0x01; 799 /* print some capability bits */ 800 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 801 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 802 cd->cdi.speed, 803 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 804 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 805 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 806 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 807 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 808 loadmech[buffer[n + 6] >> 5]); 809 if ((buffer[n + 6] >> 5) == 0) 810 /* caddy drives can't close tray... */ 811 cd->cdi.mask |= CDC_CLOSE_TRAY; 812 if ((buffer[n + 2] & 0x8) == 0) 813 /* not a DVD drive */ 814 cd->cdi.mask |= CDC_DVD; 815 if ((buffer[n + 3] & 0x20) == 0) 816 /* can't write DVD-RAM media */ 817 cd->cdi.mask |= CDC_DVD_RAM; 818 if ((buffer[n + 3] & 0x10) == 0) 819 /* can't write DVD-R media */ 820 cd->cdi.mask |= CDC_DVD_R; 821 if ((buffer[n + 3] & 0x2) == 0) 822 /* can't write CD-RW media */ 823 cd->cdi.mask |= CDC_CD_RW; 824 if ((buffer[n + 3] & 0x1) == 0) 825 /* can't write CD-R media */ 826 cd->cdi.mask |= CDC_CD_R; 827 if ((buffer[n + 6] & 0x8) == 0) 828 /* can't eject */ 829 cd->cdi.mask |= CDC_OPEN_TRAY; 830 831 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 832 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 833 cd->cdi.capacity = 834 cdrom_number_of_slots(&cd->cdi); 835 if (cd->cdi.capacity <= 1) 836 /* not a changer */ 837 cd->cdi.mask |= CDC_SELECT_DISC; 838 /*else I don't think it can close its tray 839 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 840 841 /* 842 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 843 */ 844 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 845 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 846 cd->device->writeable = 1; 847 } 848 849 kfree(buffer); 850 } 851 852 /* 853 * sr_packet() is the entry point for the generic commands generated 854 * by the Uniform CD-ROM layer. 855 */ 856 static int sr_packet(struct cdrom_device_info *cdi, 857 struct packet_command *cgc) 858 { 859 if (cgc->timeout <= 0) 860 cgc->timeout = IOCTL_TIMEOUT; 861 862 sr_do_ioctl(cdi->handle, cgc); 863 864 return cgc->stat; 865 } 866 867 /** 868 * sr_kref_release - Called to free the scsi_cd structure 869 * @kref: pointer to embedded kref 870 * 871 * sr_ref_mutex must be held entering this routine. Because it is 872 * called on last put, you should always use the scsi_cd_get() 873 * scsi_cd_put() helpers which manipulate the semaphore directly 874 * and never do a direct kref_put(). 875 **/ 876 static void sr_kref_release(struct kref *kref) 877 { 878 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 879 struct gendisk *disk = cd->disk; 880 881 spin_lock(&sr_index_lock); 882 clear_bit(disk->first_minor, sr_index_bits); 883 spin_unlock(&sr_index_lock); 884 885 unregister_cdrom(&cd->cdi); 886 887 disk->private_data = NULL; 888 889 put_disk(disk); 890 891 kfree(cd); 892 } 893 894 static int sr_remove(struct device *dev) 895 { 896 struct scsi_cd *cd = dev_get_drvdata(dev); 897 898 del_gendisk(cd->disk); 899 900 mutex_lock(&sr_ref_mutex); 901 kref_put(&cd->kref, sr_kref_release); 902 mutex_unlock(&sr_ref_mutex); 903 904 return 0; 905 } 906 907 static int __init init_sr(void) 908 { 909 int rc; 910 911 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 912 if (rc) 913 return rc; 914 rc = scsi_register_driver(&sr_template.gendrv); 915 if (rc) 916 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 917 918 return rc; 919 } 920 921 static void __exit exit_sr(void) 922 { 923 scsi_unregister_driver(&sr_template.gendrv); 924 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 925 } 926 927 module_init(init_sr); 928 module_exit(exit_sr); 929 MODULE_LICENSE("GPL"); 930