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