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 /* identical to scsi_test_unit_ready except that it doesn't 167 * eat the NOT_READY returns for removable media */ 168 int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) 169 { 170 int retries = MAX_RETRIES; 171 int the_result; 172 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; 173 174 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 175 * conditions are gone, or a timeout happens 176 */ 177 do { 178 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 179 0, sshdr, SR_TIMEOUT, 180 retries--); 181 182 } while (retries > 0 && 183 (!scsi_status_is_good(the_result) || 184 (scsi_sense_valid(sshdr) && 185 sshdr->sense_key == UNIT_ATTENTION))); 186 return the_result; 187 } 188 189 /* 190 * This function checks to see if the media has been changed in the 191 * CDROM drive. It is possible that we have already sensed a change, 192 * or the drive may have sensed one and not yet reported it. We must 193 * be ready for either case. This function always reports the current 194 * value of the changed bit. If flag is 0, then the changed bit is reset. 195 * This function could be done as an ioctl, but we would need to have 196 * an inode for that to work, and we do not always have one. 197 */ 198 199 static int sr_media_change(struct cdrom_device_info *cdi, int slot) 200 { 201 struct scsi_cd *cd = cdi->handle; 202 int retval; 203 struct scsi_sense_hdr *sshdr; 204 205 if (CDSL_CURRENT != slot) { 206 /* no changer support */ 207 return -EINVAL; 208 } 209 210 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 211 retval = sr_test_unit_ready(cd->device, sshdr); 212 if (retval || (scsi_sense_valid(sshdr) && 213 /* 0x3a is medium not present */ 214 sshdr->asc == 0x3a)) { 215 /* Media not present or unable to test, unit probably not 216 * ready. This usually means there is no disc in the drive. 217 * Mark as changed, and we will figure it out later once 218 * the drive is available again. 219 */ 220 cd->device->changed = 1; 221 /* This will force a flush, if called from check_disk_change */ 222 retval = 1; 223 goto out; 224 }; 225 226 retval = cd->device->changed; 227 cd->device->changed = 0; 228 /* If the disk changed, the capacity will now be different, 229 * so we force a re-read of this information */ 230 if (retval) { 231 /* check multisession offset etc */ 232 sr_cd_check(cdi); 233 get_sectorsize(cd); 234 } 235 236 out: 237 /* Notify userspace, that media has changed. */ 238 if (retval != cd->previous_state) 239 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, 240 GFP_KERNEL); 241 cd->previous_state = retval; 242 kfree(sshdr); 243 244 return retval; 245 } 246 247 /* 248 * sr_done is the interrupt routine for the device driver. 249 * 250 * It will be notified on the end of a SCSI read / write, and will take one 251 * of several actions based on success or failure. 252 */ 253 static int sr_done(struct scsi_cmnd *SCpnt) 254 { 255 int result = SCpnt->result; 256 int this_count = scsi_bufflen(SCpnt); 257 int good_bytes = (result == 0 ? this_count : 0); 258 int block_sectors = 0; 259 long error_sector; 260 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 261 262 #ifdef DEBUG 263 printk("sr.c done: %x\n", result); 264 #endif 265 266 /* 267 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 268 * success. Since this is a relatively rare error condition, no 269 * care is taken to avoid unnecessary additional work such as 270 * memcpy's that could be avoided. 271 */ 272 if (driver_byte(result) != 0 && /* An error occurred */ 273 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 274 switch (SCpnt->sense_buffer[2]) { 275 case MEDIUM_ERROR: 276 case VOLUME_OVERFLOW: 277 case ILLEGAL_REQUEST: 278 if (!(SCpnt->sense_buffer[0] & 0x90)) 279 break; 280 error_sector = (SCpnt->sense_buffer[3] << 24) | 281 (SCpnt->sense_buffer[4] << 16) | 282 (SCpnt->sense_buffer[5] << 8) | 283 SCpnt->sense_buffer[6]; 284 if (SCpnt->request->bio != NULL) 285 block_sectors = 286 bio_sectors(SCpnt->request->bio); 287 if (block_sectors < 4) 288 block_sectors = 4; 289 if (cd->device->sector_size == 2048) 290 error_sector <<= 2; 291 error_sector &= ~(block_sectors - 1); 292 good_bytes = (error_sector - SCpnt->request->sector) << 9; 293 if (good_bytes < 0 || good_bytes >= this_count) 294 good_bytes = 0; 295 /* 296 * The SCSI specification allows for the value 297 * returned by READ CAPACITY to be up to 75 2K 298 * sectors past the last readable block. 299 * Therefore, if we hit a medium error within the 300 * last 75 2K sectors, we decrease the saved size 301 * value. 302 */ 303 if (error_sector < get_capacity(cd->disk) && 304 cd->capacity - error_sector < 4 * 75) 305 set_capacity(cd->disk, error_sector); 306 break; 307 308 case RECOVERED_ERROR: 309 310 /* 311 * An error occured, but it recovered. Inform the 312 * user, but make sure that it's not treated as a 313 * hard error. 314 */ 315 scsi_print_sense("sr", SCpnt); 316 SCpnt->result = 0; 317 SCpnt->sense_buffer[0] = 0x0; 318 good_bytes = this_count; 319 break; 320 321 default: 322 break; 323 } 324 } 325 326 return good_bytes; 327 } 328 329 static int sr_prep_fn(struct request_queue *q, struct request *rq) 330 { 331 int block=0, this_count, s_size, timeout = SR_TIMEOUT; 332 struct scsi_cd *cd; 333 struct scsi_cmnd *SCpnt; 334 struct scsi_device *sdp = q->queuedata; 335 int ret; 336 337 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 338 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 339 goto out; 340 } else if (rq->cmd_type != REQ_TYPE_FS) { 341 ret = BLKPREP_KILL; 342 goto out; 343 } 344 ret = scsi_setup_fs_cmnd(sdp, rq); 345 if (ret != BLKPREP_OK) 346 goto out; 347 SCpnt = rq->special; 348 cd = scsi_cd(rq->rq_disk); 349 350 /* from here on until we're complete, any goto out 351 * is used for a killable error condition */ 352 ret = BLKPREP_KILL; 353 354 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 355 cd->disk->disk_name, block)); 356 357 if (!cd->device || !scsi_device_online(cd->device)) { 358 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", 359 rq->nr_sectors)); 360 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 361 goto out; 362 } 363 364 if (cd->device->changed) { 365 /* 366 * quietly refuse to do anything to a changed disc until the 367 * changed bit has been reset 368 */ 369 goto out; 370 } 371 372 /* 373 * we do lazy blocksize switching (when reading XA sectors, 374 * see CDROMREADMODE2 ioctl) 375 */ 376 s_size = cd->device->sector_size; 377 if (s_size > 2048) { 378 if (!in_interrupt()) 379 sr_set_blocklength(cd, 2048); 380 else 381 printk("sr: can't switch blocksize: in interrupt\n"); 382 } 383 384 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 385 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 386 goto out; 387 } 388 389 if (rq_data_dir(rq) == WRITE) { 390 if (!cd->device->writeable) 391 goto out; 392 SCpnt->cmnd[0] = WRITE_10; 393 SCpnt->sc_data_direction = DMA_TO_DEVICE; 394 cd->cdi.media_written = 1; 395 } else if (rq_data_dir(rq) == READ) { 396 SCpnt->cmnd[0] = READ_10; 397 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 398 } else { 399 blk_dump_rq_flags(rq, "Unknown sr command"); 400 goto out; 401 } 402 403 { 404 struct scatterlist *sg; 405 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 406 407 scsi_for_each_sg(SCpnt, sg, sg_count, i) 408 size += sg->length; 409 410 if (size != scsi_bufflen(SCpnt)) { 411 scmd_printk(KERN_ERR, SCpnt, 412 "mismatch count %d, bytes %d\n", 413 size, scsi_bufflen(SCpnt)); 414 if (scsi_bufflen(SCpnt) > size) 415 SCpnt->sdb.length = size; 416 } 417 } 418 419 /* 420 * request doesn't start on hw block boundary, add scatter pads 421 */ 422 if (((unsigned int)rq->sector % (s_size >> 9)) || 423 (scsi_bufflen(SCpnt) % s_size)) { 424 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 425 goto out; 426 } 427 428 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 429 430 431 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", 432 cd->cdi.name, 433 (rq_data_dir(rq) == WRITE) ? 434 "writing" : "reading", 435 this_count, rq->nr_sectors)); 436 437 SCpnt->cmnd[1] = 0; 438 block = (unsigned int)rq->sector / (s_size >> 9); 439 440 if (this_count > 0xffff) { 441 this_count = 0xffff; 442 SCpnt->sdb.length = this_count * s_size; 443 } 444 445 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 446 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 447 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 448 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 449 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 450 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 451 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 452 453 /* 454 * We shouldn't disconnect in the middle of a sector, so with a dumb 455 * host adapter, it's safe to assume that we can at least transfer 456 * this many bytes between each connect / disconnect. 457 */ 458 SCpnt->transfersize = cd->device->sector_size; 459 SCpnt->underflow = this_count << 9; 460 SCpnt->allowed = MAX_RETRIES; 461 SCpnt->timeout_per_command = timeout; 462 463 /* 464 * This indicates that the command is ready from our end to be 465 * queued. 466 */ 467 ret = BLKPREP_OK; 468 out: 469 return scsi_prep_return(q, rq, ret); 470 } 471 472 static int sr_block_open(struct inode *inode, struct file *file) 473 { 474 struct gendisk *disk = inode->i_bdev->bd_disk; 475 struct scsi_cd *cd; 476 int ret = 0; 477 478 if(!(cd = scsi_cd_get(disk))) 479 return -ENXIO; 480 481 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) 482 scsi_cd_put(cd); 483 484 return ret; 485 } 486 487 static int sr_block_release(struct inode *inode, struct file *file) 488 { 489 int ret; 490 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 491 ret = cdrom_release(&cd->cdi, file); 492 if(ret) 493 return ret; 494 495 scsi_cd_put(cd); 496 497 return 0; 498 } 499 500 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, 501 unsigned long arg) 502 { 503 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 504 struct scsi_device *sdev = cd->device; 505 void __user *argp = (void __user *)arg; 506 int ret; 507 508 /* 509 * Send SCSI addressing ioctls directly to mid level, send other 510 * ioctls to cdrom/block level. 511 */ 512 switch (cmd) { 513 case SCSI_IOCTL_GET_IDLUN: 514 case SCSI_IOCTL_GET_BUS_NUMBER: 515 return scsi_ioctl(sdev, cmd, argp); 516 } 517 518 ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); 519 if (ret != -ENOSYS) 520 return ret; 521 522 /* 523 * ENODEV means that we didn't recognise the ioctl, or that we 524 * cannot execute it in the current device state. In either 525 * case fall through to scsi_ioctl, which will return ENDOEV again 526 * if it doesn't recognise the ioctl 527 */ 528 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL); 529 if (ret != -ENODEV) 530 return ret; 531 return scsi_ioctl(sdev, cmd, argp); 532 } 533 534 static int sr_block_media_changed(struct gendisk *disk) 535 { 536 struct scsi_cd *cd = scsi_cd(disk); 537 return cdrom_media_changed(&cd->cdi); 538 } 539 540 static struct block_device_operations sr_bdops = 541 { 542 .owner = THIS_MODULE, 543 .open = sr_block_open, 544 .release = sr_block_release, 545 .ioctl = sr_block_ioctl, 546 .media_changed = sr_block_media_changed, 547 /* 548 * No compat_ioctl for now because sr_block_ioctl never 549 * seems to pass arbitary ioctls down to host drivers. 550 */ 551 }; 552 553 static int sr_open(struct cdrom_device_info *cdi, int purpose) 554 { 555 struct scsi_cd *cd = cdi->handle; 556 struct scsi_device *sdev = cd->device; 557 int retval; 558 559 /* 560 * If the device is in error recovery, wait until it is done. 561 * If the device is offline, then disallow any access to it. 562 */ 563 retval = -ENXIO; 564 if (!scsi_block_when_processing_errors(sdev)) 565 goto error_out; 566 567 return 0; 568 569 error_out: 570 return retval; 571 } 572 573 static void sr_release(struct cdrom_device_info *cdi) 574 { 575 struct scsi_cd *cd = cdi->handle; 576 577 if (cd->device->sector_size > 2048) 578 sr_set_blocklength(cd, 2048); 579 580 } 581 582 static int sr_probe(struct device *dev) 583 { 584 struct scsi_device *sdev = to_scsi_device(dev); 585 struct gendisk *disk; 586 struct scsi_cd *cd; 587 int minor, error; 588 589 error = -ENODEV; 590 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 591 goto fail; 592 593 error = -ENOMEM; 594 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 595 if (!cd) 596 goto fail; 597 598 kref_init(&cd->kref); 599 600 disk = alloc_disk(1); 601 if (!disk) 602 goto fail_free; 603 604 spin_lock(&sr_index_lock); 605 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 606 if (minor == SR_DISKS) { 607 spin_unlock(&sr_index_lock); 608 error = -EBUSY; 609 goto fail_put; 610 } 611 __set_bit(minor, sr_index_bits); 612 spin_unlock(&sr_index_lock); 613 614 disk->major = SCSI_CDROM_MAJOR; 615 disk->first_minor = minor; 616 sprintf(disk->disk_name, "sr%d", minor); 617 disk->fops = &sr_bdops; 618 disk->flags = GENHD_FL_CD; 619 620 cd->device = sdev; 621 cd->disk = disk; 622 cd->driver = &sr_template; 623 cd->disk = disk; 624 cd->capacity = 0x1fffff; 625 cd->device->changed = 1; /* force recheck CD type */ 626 cd->use = 1; 627 cd->readcd_known = 0; 628 cd->readcd_cdda = 0; 629 630 cd->cdi.ops = &sr_dops; 631 cd->cdi.handle = cd; 632 cd->cdi.mask = 0; 633 cd->cdi.capacity = 1; 634 sprintf(cd->cdi.name, "sr%d", minor); 635 636 sdev->sector_size = 2048; /* A guess, just in case */ 637 638 /* FIXME: need to handle a get_capabilities failure properly ?? */ 639 get_capabilities(cd); 640 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 641 sr_vendor_init(cd); 642 643 disk->driverfs_dev = &sdev->sdev_gendev; 644 set_capacity(disk, cd->capacity); 645 disk->private_data = &cd->driver; 646 disk->queue = sdev->request_queue; 647 cd->cdi.disk = disk; 648 649 if (register_cdrom(&cd->cdi)) 650 goto fail_put; 651 652 dev_set_drvdata(dev, cd); 653 disk->flags |= GENHD_FL_REMOVABLE; 654 add_disk(disk); 655 656 sdev_printk(KERN_DEBUG, sdev, 657 "Attached scsi CD-ROM %s\n", cd->cdi.name); 658 return 0; 659 660 fail_put: 661 put_disk(disk); 662 fail_free: 663 kfree(cd); 664 fail: 665 return error; 666 } 667 668 669 static void get_sectorsize(struct scsi_cd *cd) 670 { 671 unsigned char cmd[10]; 672 unsigned char *buffer; 673 int the_result, retries = 3; 674 int sector_size; 675 struct request_queue *queue; 676 677 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 678 if (!buffer) 679 goto Enomem; 680 681 do { 682 cmd[0] = READ_CAPACITY; 683 memset((void *) &cmd[1], 0, 9); 684 memset(buffer, 0, 8); 685 686 /* Do the command and wait.. */ 687 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 688 buffer, 8, NULL, SR_TIMEOUT, 689 MAX_RETRIES); 690 691 retries--; 692 693 } while (the_result && retries); 694 695 696 if (the_result) { 697 cd->capacity = 0x1fffff; 698 sector_size = 2048; /* A guess, just in case */ 699 } else { 700 #if 0 701 if (cdrom_get_last_written(&cd->cdi, 702 &cd->capacity)) 703 #endif 704 cd->capacity = 1 + ((buffer[0] << 24) | 705 (buffer[1] << 16) | 706 (buffer[2] << 8) | 707 buffer[3]); 708 sector_size = (buffer[4] << 24) | 709 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 710 switch (sector_size) { 711 /* 712 * HP 4020i CD-Recorder reports 2340 byte sectors 713 * Philips CD-Writers report 2352 byte sectors 714 * 715 * Use 2k sectors for them.. 716 */ 717 case 0: 718 case 2340: 719 case 2352: 720 sector_size = 2048; 721 /* fall through */ 722 case 2048: 723 cd->capacity *= 4; 724 /* fall through */ 725 case 512: 726 break; 727 default: 728 printk("%s: unsupported sector size %d.\n", 729 cd->cdi.name, sector_size); 730 cd->capacity = 0; 731 } 732 733 cd->device->sector_size = sector_size; 734 735 /* 736 * Add this so that we have the ability to correctly gauge 737 * what the device is capable of. 738 */ 739 set_capacity(cd->disk, cd->capacity); 740 } 741 742 queue = cd->device->request_queue; 743 blk_queue_hardsect_size(queue, sector_size); 744 out: 745 kfree(buffer); 746 return; 747 748 Enomem: 749 cd->capacity = 0x1fffff; 750 cd->device->sector_size = 2048; /* A guess, just in case */ 751 goto out; 752 } 753 754 static void get_capabilities(struct scsi_cd *cd) 755 { 756 unsigned char *buffer; 757 struct scsi_mode_data data; 758 struct scsi_sense_hdr sshdr; 759 int rc, n; 760 761 static const char *loadmech[] = 762 { 763 "caddy", 764 "tray", 765 "pop-up", 766 "", 767 "changer", 768 "cartridge changer", 769 "", 770 "" 771 }; 772 773 774 /* allocate transfer buffer */ 775 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 776 if (!buffer) { 777 printk(KERN_ERR "sr: out of memory.\n"); 778 return; 779 } 780 781 /* eat unit attentions */ 782 sr_test_unit_ready(cd->device, &sshdr); 783 784 /* ask for mode page 0x2a */ 785 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 786 SR_TIMEOUT, 3, &data, NULL); 787 788 if (!scsi_status_is_good(rc)) { 789 /* failed, drive doesn't have capabilities mode page */ 790 cd->cdi.speed = 1; 791 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 792 CDC_DVD | CDC_DVD_RAM | 793 CDC_SELECT_DISC | CDC_SELECT_SPEED | 794 CDC_MRW | CDC_MRW_W | CDC_RAM); 795 kfree(buffer); 796 printk("%s: scsi-1 drive\n", cd->cdi.name); 797 return; 798 } 799 800 n = data.header_length + data.block_descriptor_length; 801 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 802 cd->readcd_known = 1; 803 cd->readcd_cdda = buffer[n + 5] & 0x01; 804 /* print some capability bits */ 805 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 806 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 807 cd->cdi.speed, 808 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 809 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 810 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 811 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 812 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 813 loadmech[buffer[n + 6] >> 5]); 814 if ((buffer[n + 6] >> 5) == 0) 815 /* caddy drives can't close tray... */ 816 cd->cdi.mask |= CDC_CLOSE_TRAY; 817 if ((buffer[n + 2] & 0x8) == 0) 818 /* not a DVD drive */ 819 cd->cdi.mask |= CDC_DVD; 820 if ((buffer[n + 3] & 0x20) == 0) 821 /* can't write DVD-RAM media */ 822 cd->cdi.mask |= CDC_DVD_RAM; 823 if ((buffer[n + 3] & 0x10) == 0) 824 /* can't write DVD-R media */ 825 cd->cdi.mask |= CDC_DVD_R; 826 if ((buffer[n + 3] & 0x2) == 0) 827 /* can't write CD-RW media */ 828 cd->cdi.mask |= CDC_CD_RW; 829 if ((buffer[n + 3] & 0x1) == 0) 830 /* can't write CD-R media */ 831 cd->cdi.mask |= CDC_CD_R; 832 if ((buffer[n + 6] & 0x8) == 0) 833 /* can't eject */ 834 cd->cdi.mask |= CDC_OPEN_TRAY; 835 836 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 837 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 838 cd->cdi.capacity = 839 cdrom_number_of_slots(&cd->cdi); 840 if (cd->cdi.capacity <= 1) 841 /* not a changer */ 842 cd->cdi.mask |= CDC_SELECT_DISC; 843 /*else I don't think it can close its tray 844 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 845 846 /* 847 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 848 */ 849 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 850 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 851 cd->device->writeable = 1; 852 } 853 854 kfree(buffer); 855 } 856 857 /* 858 * sr_packet() is the entry point for the generic commands generated 859 * by the Uniform CD-ROM layer. 860 */ 861 static int sr_packet(struct cdrom_device_info *cdi, 862 struct packet_command *cgc) 863 { 864 if (cgc->timeout <= 0) 865 cgc->timeout = IOCTL_TIMEOUT; 866 867 sr_do_ioctl(cdi->handle, cgc); 868 869 return cgc->stat; 870 } 871 872 /** 873 * sr_kref_release - Called to free the scsi_cd structure 874 * @kref: pointer to embedded kref 875 * 876 * sr_ref_mutex must be held entering this routine. Because it is 877 * called on last put, you should always use the scsi_cd_get() 878 * scsi_cd_put() helpers which manipulate the semaphore directly 879 * and never do a direct kref_put(). 880 **/ 881 static void sr_kref_release(struct kref *kref) 882 { 883 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 884 struct gendisk *disk = cd->disk; 885 886 spin_lock(&sr_index_lock); 887 clear_bit(disk->first_minor, sr_index_bits); 888 spin_unlock(&sr_index_lock); 889 890 unregister_cdrom(&cd->cdi); 891 892 disk->private_data = NULL; 893 894 put_disk(disk); 895 896 kfree(cd); 897 } 898 899 static int sr_remove(struct device *dev) 900 { 901 struct scsi_cd *cd = dev_get_drvdata(dev); 902 903 del_gendisk(cd->disk); 904 905 mutex_lock(&sr_ref_mutex); 906 kref_put(&cd->kref, sr_kref_release); 907 mutex_unlock(&sr_ref_mutex); 908 909 return 0; 910 } 911 912 static int __init init_sr(void) 913 { 914 int rc; 915 916 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 917 if (rc) 918 return rc; 919 rc = scsi_register_driver(&sr_template.gendrv); 920 if (rc) 921 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 922 923 return rc; 924 } 925 926 static void __exit exit_sr(void) 927 { 928 scsi_unregister_driver(&sr_template.gendrv); 929 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 930 } 931 932 module_init(init_sr); 933 module_exit(exit_sr); 934 MODULE_LICENSE("GPL"); 935