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