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 if (scsi_sense_valid(sshdr) &&
182 sshdr->sense_key == UNIT_ATTENTION)
183 sdev->changed = 1;
184
185 } while (retries > 0 &&
186 (!scsi_status_is_good(the_result) ||
187 (scsi_sense_valid(sshdr) &&
188 sshdr->sense_key == UNIT_ATTENTION)));
189 return the_result;
190 }
191
192 /*
193 * This function checks to see if the media has been changed in the
194 * CDROM drive. It is possible that we have already sensed a change,
195 * or the drive may have sensed one and not yet reported it. We must
196 * be ready for either case. This function always reports the current
197 * value of the changed bit. If flag is 0, then the changed bit is reset.
198 * This function could be done as an ioctl, but we would need to have
199 * an inode for that to work, and we do not always have one.
200 */
201
202 static int sr_media_change(struct cdrom_device_info *cdi, int slot)
203 {
204 struct scsi_cd *cd = cdi->handle;
205 int retval;
206 struct scsi_sense_hdr *sshdr;
207
208 if (CDSL_CURRENT != slot) {
209 /* no changer support */
210 return -EINVAL;
211 }
212
213 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
214 retval = sr_test_unit_ready(cd->device, sshdr);
215 if (retval || (scsi_sense_valid(sshdr) &&
216 /* 0x3a is medium not present */
217 sshdr->asc == 0x3a)) {
218 /* Media not present or unable to test, unit probably not
219 * ready. This usually means there is no disc in the drive.
220 * Mark as changed, and we will figure it out later once
221 * the drive is available again.
222 */
223 cd->device->changed = 1;
224 /* This will force a flush, if called from check_disk_change */
225 retval = 1;
226 goto out;
227 };
228
229 retval = cd->device->changed;
230 cd->device->changed = 0;
231 /* If the disk changed, the capacity will now be different,
232 * so we force a re-read of this information */
233 if (retval) {
234 /* check multisession offset etc */
235 sr_cd_check(cdi);
236 get_sectorsize(cd);
237 }
238
239 out:
240 /* Notify userspace, that media has changed. */
241 if (retval != cd->previous_state)
242 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE,
243 GFP_KERNEL);
244 cd->previous_state = retval;
245 kfree(sshdr);
246
247 return retval;
248 }
249
250 /*
251 * sr_done is the interrupt routine for the device driver.
252 *
253 * It will be notified on the end of a SCSI read / write, and will take one
254 * of several actions based on success or failure.
255 */
256 static int sr_done(struct scsi_cmnd *SCpnt)
257 {
258 int result = SCpnt->result;
259 int this_count = scsi_bufflen(SCpnt);
260 int good_bytes = (result == 0 ? this_count : 0);
261 int block_sectors = 0;
262 long error_sector;
263 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
264
265 #ifdef DEBUG
266 printk("sr.c done: %x\n", result);
267 #endif
268
269 /*
270 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
271 * success. Since this is a relatively rare error condition, no
272 * care is taken to avoid unnecessary additional work such as
273 * memcpy's that could be avoided.
274 */
275 if (driver_byte(result) != 0 && /* An error occurred */
276 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
277 switch (SCpnt->sense_buffer[2]) {
278 case MEDIUM_ERROR:
279 case VOLUME_OVERFLOW:
280 case ILLEGAL_REQUEST:
281 if (!(SCpnt->sense_buffer[0] & 0x90))
282 break;
283 error_sector = (SCpnt->sense_buffer[3] << 24) |
284 (SCpnt->sense_buffer[4] << 16) |
285 (SCpnt->sense_buffer[5] << 8) |
286 SCpnt->sense_buffer[6];
287 if (SCpnt->request->bio != NULL)
288 block_sectors =
289 bio_sectors(SCpnt->request->bio);
290 if (block_sectors < 4)
291 block_sectors = 4;
292 if (cd->device->sector_size == 2048)
293 error_sector <<= 2;
294 error_sector &= ~(block_sectors - 1);
295 good_bytes = (error_sector - SCpnt->request->sector) << 9;
296 if (good_bytes < 0 || good_bytes >= this_count)
297 good_bytes = 0;
298 /*
299 * The SCSI specification allows for the value
300 * returned by READ CAPACITY to be up to 75 2K
301 * sectors past the last readable block.
302 * Therefore, if we hit a medium error within the
303 * last 75 2K sectors, we decrease the saved size
304 * value.
305 */
306 if (error_sector < get_capacity(cd->disk) &&
307 cd->capacity - error_sector < 4 * 75)
308 set_capacity(cd->disk, error_sector);
309 break;
310
311 case RECOVERED_ERROR:
312
313 /*
314 * An error occured, but it recovered. Inform the
315 * user, but make sure that it's not treated as a
316 * hard error.
317 */
318 scsi_print_sense("sr", SCpnt);
319 SCpnt->result = 0;
320 SCpnt->sense_buffer[0] = 0x0;
321 good_bytes = this_count;
322 break;
323
324 default:
325 break;
326 }
327 }
328
329 return good_bytes;
330 }
331
332 static int sr_prep_fn(struct request_queue *q, struct request *rq)
333 {
334 int block=0, this_count, s_size, timeout = SR_TIMEOUT;
335 struct scsi_cd *cd;
336 struct scsi_cmnd *SCpnt;
337 struct scsi_device *sdp = q->queuedata;
338 int ret;
339
340 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
341 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
342 goto out;
343 } else if (rq->cmd_type != REQ_TYPE_FS) {
344 ret = BLKPREP_KILL;
345 goto out;
346 }
347 ret = scsi_setup_fs_cmnd(sdp, rq);
348 if (ret != BLKPREP_OK)
349 goto out;
350 SCpnt = rq->special;
351 cd = scsi_cd(rq->rq_disk);
352
353 /* from here on until we're complete, any goto out
354 * is used for a killable error condition */
355 ret = BLKPREP_KILL;
356
357 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
358 cd->disk->disk_name, block));
359
360 if (!cd->device || !scsi_device_online(cd->device)) {
361 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
362 rq->nr_sectors));
363 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
364 goto out;
365 }
366
367 if (cd->device->changed) {
368 /*
369 * quietly refuse to do anything to a changed disc until the
370 * changed bit has been reset
371 */
372 goto out;
373 }
374
375 /*
376 * we do lazy blocksize switching (when reading XA sectors,
377 * see CDROMREADMODE2 ioctl)
378 */
379 s_size = cd->device->sector_size;
380 if (s_size > 2048) {
381 if (!in_interrupt())
382 sr_set_blocklength(cd, 2048);
383 else
384 printk("sr: can't switch blocksize: in interrupt\n");
385 }
386
387 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
388 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
389 goto out;
390 }
391
392 if (rq_data_dir(rq) == WRITE) {
393 if (!cd->device->writeable)
394 goto out;
395 SCpnt->cmnd[0] = WRITE_10;
396 SCpnt->sc_data_direction = DMA_TO_DEVICE;
397 cd->cdi.media_written = 1;
398 } else if (rq_data_dir(rq) == READ) {
399 SCpnt->cmnd[0] = READ_10;
400 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
401 } else {
402 blk_dump_rq_flags(rq, "Unknown sr command");
403 goto out;
404 }
405
406 {
407 struct scatterlist *sg;
408 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
409
410 scsi_for_each_sg(SCpnt, sg, sg_count, i)
411 size += sg->length;
412
413 if (size != scsi_bufflen(SCpnt)) {
414 scmd_printk(KERN_ERR, SCpnt,
415 "mismatch count %d, bytes %d\n",
416 size, scsi_bufflen(SCpnt));
417 if (scsi_bufflen(SCpnt) > size)
418 SCpnt->sdb.length = size;
419 }
420 }
421
422 /*
423 * request doesn't start on hw block boundary, add scatter pads
424 */
425 if (((unsigned int)rq->sector % (s_size >> 9)) ||
426 (scsi_bufflen(SCpnt) % s_size)) {
427 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
428 goto out;
429 }
430
431 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
432
433
434 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
435 cd->cdi.name,
436 (rq_data_dir(rq) == WRITE) ?
437 "writing" : "reading",
438 this_count, rq->nr_sectors));
439
440 SCpnt->cmnd[1] = 0;
441 block = (unsigned int)rq->sector / (s_size >> 9);
442
443 if (this_count > 0xffff) {
444 this_count = 0xffff;
445 SCpnt->sdb.length = this_count * s_size;
446 }
447
448 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
449 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
450 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
451 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
452 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
453 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
454 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
455
456 /*
457 * We shouldn't disconnect in the middle of a sector, so with a dumb
458 * host adapter, it's safe to assume that we can at least transfer
459 * this many bytes between each connect / disconnect.
460 */
461 SCpnt->transfersize = cd->device->sector_size;
462 SCpnt->underflow = this_count << 9;
463 SCpnt->allowed = MAX_RETRIES;
464 SCpnt->timeout_per_command = timeout;
465
466 /*
467 * This indicates that the command is ready from our end to be
468 * queued.
469 */
470 ret = BLKPREP_OK;
471 out:
472 return scsi_prep_return(q, rq, ret);
473 }
474
475 static int sr_block_open(struct inode *inode, struct file *file)
476 {
477 struct gendisk *disk = inode->i_bdev->bd_disk;
478 struct scsi_cd *cd;
479 int ret = 0;
480
481 if(!(cd = scsi_cd_get(disk)))
482 return -ENXIO;
483
484 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0)
485 scsi_cd_put(cd);
486
487 return ret;
488 }
489
490 static int sr_block_release(struct inode *inode, struct file *file)
491 {
492 int ret;
493 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
494 ret = cdrom_release(&cd->cdi, file);
495 if(ret)
496 return ret;
497
498 scsi_cd_put(cd);
499
500 return 0;
501 }
502
503 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd,
504 unsigned long arg)
505 {
506 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
507 struct scsi_device *sdev = cd->device;
508 void __user *argp = (void __user *)arg;
509 int ret;
510
511 /*
512 * Send SCSI addressing ioctls directly to mid level, send other
513 * ioctls to cdrom/block level.
514 */
515 switch (cmd) {
516 case SCSI_IOCTL_GET_IDLUN:
517 case SCSI_IOCTL_GET_BUS_NUMBER:
518 return scsi_ioctl(sdev, cmd, argp);
519 }
520
521 ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg);
522 if (ret != -ENOSYS)
523 return ret;
524
525 /*
526 * ENODEV means that we didn't recognise the ioctl, or that we
527 * cannot execute it in the current device state. In either
528 * case fall through to scsi_ioctl, which will return ENDOEV again
529 * if it doesn't recognise the ioctl
530 */
531 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL);
532 if (ret != -ENODEV)
533 return ret;
534 return scsi_ioctl(sdev, cmd, argp);
535 }
536
537 static int sr_block_media_changed(struct gendisk *disk)
538 {
539 struct scsi_cd *cd = scsi_cd(disk);
540 return cdrom_media_changed(&cd->cdi);
541 }
542
543 static struct block_device_operations sr_bdops =
544 {
545 .owner = THIS_MODULE,
546 .open = sr_block_open,
547 .release = sr_block_release,
548 .ioctl = sr_block_ioctl,
549 .media_changed = sr_block_media_changed,
550 /*
551 * No compat_ioctl for now because sr_block_ioctl never
552 * seems to pass arbitary ioctls down to host drivers.
553 */
554 };
555
556 static int sr_open(struct cdrom_device_info *cdi, int purpose)
557 {
558 struct scsi_cd *cd = cdi->handle;
559 struct scsi_device *sdev = cd->device;
560 int retval;
561
562 /*
563 * If the device is in error recovery, wait until it is done.
564 * If the device is offline, then disallow any access to it.
565 */
566 retval = -ENXIO;
567 if (!scsi_block_when_processing_errors(sdev))
568 goto error_out;
569
570 return 0;
571
572 error_out:
573 return retval;
574 }
575
576 static void sr_release(struct cdrom_device_info *cdi)
577 {
578 struct scsi_cd *cd = cdi->handle;
579
580 if (cd->device->sector_size > 2048)
581 sr_set_blocklength(cd, 2048);
582
583 }
584
585 static int sr_probe(struct device *dev)
586 {
587 struct scsi_device *sdev = to_scsi_device(dev);
588 struct gendisk *disk;
589 struct scsi_cd *cd;
590 int minor, error;
591
592 error = -ENODEV;
593 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
594 goto fail;
595
596 error = -ENOMEM;
597 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
598 if (!cd)
599 goto fail;
600
601 kref_init(&cd->kref);
602
603 disk = alloc_disk(1);
604 if (!disk)
605 goto fail_free;
606
607 spin_lock(&sr_index_lock);
608 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
609 if (minor == SR_DISKS) {
610 spin_unlock(&sr_index_lock);
611 error = -EBUSY;
612 goto fail_put;
613 }
614 __set_bit(minor, sr_index_bits);
615 spin_unlock(&sr_index_lock);
616
617 disk->major = SCSI_CDROM_MAJOR;
618 disk->first_minor = minor;
619 sprintf(disk->disk_name, "sr%d", minor);
620 disk->fops = &sr_bdops;
621 disk->flags = GENHD_FL_CD;
622
623 cd->device = sdev;
624 cd->disk = disk;
625 cd->driver = &sr_template;
626 cd->disk = disk;
627 cd->capacity = 0x1fffff;
628 cd->device->changed = 1; /* force recheck CD type */
629 cd->previous_state = 1;
630 cd->use = 1;
631 cd->readcd_known = 0;
632 cd->readcd_cdda = 0;
633
634 cd->cdi.ops = &sr_dops;
635 cd->cdi.handle = cd;
636 cd->cdi.mask = 0;
637 cd->cdi.capacity = 1;
638 sprintf(cd->cdi.name, "sr%d", minor);
639
640 sdev->sector_size = 2048; /* A guess, just in case */
641
642 /* FIXME: need to handle a get_capabilities failure properly ?? */
643 get_capabilities(cd);
644 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
645 sr_vendor_init(cd);
646
647 disk->driverfs_dev = &sdev->sdev_gendev;
648 set_capacity(disk, cd->capacity);
649 disk->private_data = &cd->driver;
650 disk->queue = sdev->request_queue;
651 cd->cdi.disk = disk;
652
653 if (register_cdrom(&cd->cdi))
654 goto fail_put;
655
656 dev_set_drvdata(dev, cd);
657 disk->flags |= GENHD_FL_REMOVABLE;
658 add_disk(disk);
659
660 sdev_printk(KERN_DEBUG, sdev,
661 "Attached scsi CD-ROM %s\n", cd->cdi.name);
662 return 0;
663
664 fail_put:
665 put_disk(disk);
666 fail_free:
667 kfree(cd);
668 fail:
669 return error;
670 }
671
672
673 static void get_sectorsize(struct scsi_cd *cd)
674 {
675 unsigned char cmd[10];
676 unsigned char *buffer;
677 int the_result, retries = 3;
678 int sector_size;
679 struct request_queue *queue;
680
681 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
682 if (!buffer)
683 goto Enomem;
684
685 do {
686 cmd[0] = READ_CAPACITY;
687 memset((void *) &cmd[1], 0, 9);
688 memset(buffer, 0, 8);
689
690 /* Do the command and wait.. */
691 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
692 buffer, 8, NULL, SR_TIMEOUT,
693 MAX_RETRIES);
694
695 retries--;
696
697 } while (the_result && retries);
698
699
700 if (the_result) {
701 cd->capacity = 0x1fffff;
702 sector_size = 2048; /* A guess, just in case */
703 } else {
704 #if 0
705 if (cdrom_get_last_written(&cd->cdi,
706 &cd->capacity))
707 #endif
708 cd->capacity = 1 + ((buffer[0] << 24) |
709 (buffer[1] << 16) |
710 (buffer[2] << 8) |
711 buffer[3]);
712 sector_size = (buffer[4] << 24) |
713 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
714 switch (sector_size) {
715 /*
716 * HP 4020i CD-Recorder reports 2340 byte sectors
717 * Philips CD-Writers report 2352 byte sectors
718 *
719 * Use 2k sectors for them..
720 */
721 case 0:
722 case 2340:
723 case 2352:
724 sector_size = 2048;
725 /* fall through */
726 case 2048:
727 cd->capacity *= 4;
728 /* fall through */
729 case 512:
730 break;
731 default:
732 printk("%s: unsupported sector size %d.\n",
733 cd->cdi.name, sector_size);
734 cd->capacity = 0;
735 }
736
737 cd->device->sector_size = sector_size;
738
739 /*
740 * Add this so that we have the ability to correctly gauge
741 * what the device is capable of.
742 */
743 set_capacity(cd->disk, cd->capacity);
744 }
745
746 queue = cd->device->request_queue;
747 blk_queue_hardsect_size(queue, sector_size);
748 out:
749 kfree(buffer);
750 return;
751
752 Enomem:
753 cd->capacity = 0x1fffff;
754 cd->device->sector_size = 2048; /* A guess, just in case */
755 goto out;
756 }
757
758 static void get_capabilities(struct scsi_cd *cd)
759 {
760 unsigned char *buffer;
761 struct scsi_mode_data data;
762 struct scsi_sense_hdr sshdr;
763 int rc, n;
764
765 static const char *loadmech[] =
766 {
767 "caddy",
768 "tray",
769 "pop-up",
770 "",
771 "changer",
772 "cartridge changer",
773 "",
774 ""
775 };
776
777
778 /* allocate transfer buffer */
779 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
780 if (!buffer) {
781 printk(KERN_ERR "sr: out of memory.\n");
782 return;
783 }
784
785 /* eat unit attentions */
786 sr_test_unit_ready(cd->device, &sshdr);
787
788 /* ask for mode page 0x2a */
789 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
790 SR_TIMEOUT, 3, &data, NULL);
791
792 if (!scsi_status_is_good(rc)) {
793 /* failed, drive doesn't have capabilities mode page */
794 cd->cdi.speed = 1;
795 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
796 CDC_DVD | CDC_DVD_RAM |
797 CDC_SELECT_DISC | CDC_SELECT_SPEED |
798 CDC_MRW | CDC_MRW_W | CDC_RAM);
799 kfree(buffer);
800 printk("%s: scsi-1 drive\n", cd->cdi.name);
801 return;
802 }
803
804 n = data.header_length + data.block_descriptor_length;
805 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
806 cd->readcd_known = 1;
807 cd->readcd_cdda = buffer[n + 5] & 0x01;
808 /* print some capability bits */
809 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
810 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
811 cd->cdi.speed,
812 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
813 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
814 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
815 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
816 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
817 loadmech[buffer[n + 6] >> 5]);
818 if ((buffer[n + 6] >> 5) == 0)
819 /* caddy drives can't close tray... */
820 cd->cdi.mask |= CDC_CLOSE_TRAY;
821 if ((buffer[n + 2] & 0x8) == 0)
822 /* not a DVD drive */
823 cd->cdi.mask |= CDC_DVD;
824 if ((buffer[n + 3] & 0x20) == 0)
825 /* can't write DVD-RAM media */
826 cd->cdi.mask |= CDC_DVD_RAM;
827 if ((buffer[n + 3] & 0x10) == 0)
828 /* can't write DVD-R media */
829 cd->cdi.mask |= CDC_DVD_R;
830 if ((buffer[n + 3] & 0x2) == 0)
831 /* can't write CD-RW media */
832 cd->cdi.mask |= CDC_CD_RW;
833 if ((buffer[n + 3] & 0x1) == 0)
834 /* can't write CD-R media */
835 cd->cdi.mask |= CDC_CD_R;
836 if ((buffer[n + 6] & 0x8) == 0)
837 /* can't eject */
838 cd->cdi.mask |= CDC_OPEN_TRAY;
839
840 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
841 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
842 cd->cdi.capacity =
843 cdrom_number_of_slots(&cd->cdi);
844 if (cd->cdi.capacity <= 1)
845 /* not a changer */
846 cd->cdi.mask |= CDC_SELECT_DISC;
847 /*else I don't think it can close its tray
848 cd->cdi.mask |= CDC_CLOSE_TRAY; */
849
850 /*
851 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
852 */
853 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
854 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
855 cd->device->writeable = 1;
856 }
857
858 kfree(buffer);
859 }
860
861 /*
862 * sr_packet() is the entry point for the generic commands generated
863 * by the Uniform CD-ROM layer.
864 */
865 static int sr_packet(struct cdrom_device_info *cdi,
866 struct packet_command *cgc)
867 {
868 if (cgc->timeout <= 0)
869 cgc->timeout = IOCTL_TIMEOUT;
870
871 sr_do_ioctl(cdi->handle, cgc);
872
873 return cgc->stat;
874 }
875
876 /**
877 * sr_kref_release - Called to free the scsi_cd structure
878 * @kref: pointer to embedded kref
879 *
880 * sr_ref_mutex must be held entering this routine. Because it is
881 * called on last put, you should always use the scsi_cd_get()
882 * scsi_cd_put() helpers which manipulate the semaphore directly
883 * and never do a direct kref_put().
884 **/
885 static void sr_kref_release(struct kref *kref)
886 {
887 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
888 struct gendisk *disk = cd->disk;
889
890 spin_lock(&sr_index_lock);
891 clear_bit(disk->first_minor, sr_index_bits);
892 spin_unlock(&sr_index_lock);
893
894 unregister_cdrom(&cd->cdi);
895
896 disk->private_data = NULL;
897
898 put_disk(disk);
899
900 kfree(cd);
901 }
902
903 static int sr_remove(struct device *dev)
904 {
905 struct scsi_cd *cd = dev_get_drvdata(dev);
906
907 del_gendisk(cd->disk);
908
909 mutex_lock(&sr_ref_mutex);
910 kref_put(&cd->kref, sr_kref_release);
911 mutex_unlock(&sr_ref_mutex);
912
913 return 0;
914 }
915
916 static int __init init_sr(void)
917 {
918 int rc;
919
920 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
921 if (rc)
922 return rc;
923 rc = scsi_register_driver(&sr_template.gendrv);
924 if (rc)
925 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
926
927 return rc;
928 }
929
930 static void __exit exit_sr(void)
931 {
932 scsi_unregister_driver(&sr_template.gendrv);
933 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
934 }
935
936 module_init(init_sr);
937 module_exit(exit_sr);
938 MODULE_LICENSE("GPL");
939
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