2 * sr.c Copyright (C) 1992 David Giller
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
6 * sd.c Copyright (C) 1992 Drew Eckhardt
7 * Linux scsi disk driver by
8 * Drew Eckhardt <drew@colorado.edu>
10 * Modified by Eric Youngdale ericy@andante.org to
11 * add scatter-gather, multiple outstanding request, and other
14 * Modified by Eric Youngdale eric@andante.org to support loadable
15 * low-level scsi drivers.
17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
21 * generic cdrom interface
23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
24 * interface, capabilities probe additions, ioctl cleanups, etc.
26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
29 * transparently and lose the GHOST hack
31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
32 * check resource allocation in sr_init and some cleanups
35 #include <linux/module.h>
37 #include <linux/kernel.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 <linux/slab.h>
48 #include <asm/uaccess.h>
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 */
59 #include "scsi_logging.h"
63 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
64 MODULE_LICENSE("GPL");
65 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR
);
66 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM
);
67 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM
);
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)
78 static DEFINE_MUTEX(sr_mutex
);
79 static int sr_probe(struct device
*);
80 static int sr_remove(struct device
*);
81 static int sr_done(struct scsi_cmnd
*);
83 static struct scsi_driver sr_template
= {
93 static unsigned long sr_index_bits
[SR_DISKS
/ BITS_PER_LONG
];
94 static DEFINE_SPINLOCK(sr_index_lock
);
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
);
101 static int sr_open(struct cdrom_device_info
*, int);
102 static void sr_release(struct cdrom_device_info
*);
104 static void get_sectorsize(struct scsi_cd
*);
105 static void get_capabilities(struct scsi_cd
*);
107 static unsigned int sr_check_events(struct cdrom_device_info
*cdi
,
108 unsigned int clearing
, int slot
);
109 static int sr_packet(struct cdrom_device_info
*, struct packet_command
*);
111 static struct cdrom_device_ops sr_dops
= {
113 .release
= sr_release
,
114 .drive_status
= sr_drive_status
,
115 .check_events
= sr_check_events
,
116 .tray_move
= sr_tray_move
,
117 .lock_door
= sr_lock_door
,
118 .select_speed
= sr_select_speed
,
119 .get_last_session
= sr_get_last_session
,
120 .get_mcn
= sr_get_mcn
,
122 .audio_ioctl
= sr_audio_ioctl
,
123 .capability
= SR_CAPABILITIES
,
124 .generic_packet
= sr_packet
,
127 static void sr_kref_release(struct kref
*kref
);
129 static inline struct scsi_cd
*scsi_cd(struct gendisk
*disk
)
131 return container_of(disk
->private_data
, struct scsi_cd
, driver
);
135 * The get and put routines for the struct scsi_cd. Note this entity
136 * has a scsi_device pointer and owns a reference to this.
138 static inline struct scsi_cd
*scsi_cd_get(struct gendisk
*disk
)
140 struct scsi_cd
*cd
= NULL
;
142 mutex_lock(&sr_ref_mutex
);
143 if (disk
->private_data
== NULL
)
147 if (scsi_device_get(cd
->device
))
152 kref_put(&cd
->kref
, sr_kref_release
);
155 mutex_unlock(&sr_ref_mutex
);
159 static void scsi_cd_put(struct scsi_cd
*cd
)
161 struct scsi_device
*sdev
= cd
->device
;
163 mutex_lock(&sr_ref_mutex
);
164 kref_put(&cd
->kref
, sr_kref_release
);
165 scsi_device_put(sdev
);
166 mutex_unlock(&sr_ref_mutex
);
169 static unsigned int sr_get_events(struct scsi_device
*sdev
)
172 u8 cmd
[] = { GET_EVENT_STATUS_NOTIFICATION
,
175 1 << 4, /* notification class: media */
177 0, sizeof(buf
), /* allocation length */
180 struct event_header
*eh
= (void *)buf
;
181 struct media_event_desc
*med
= (void *)(buf
+ 4);
182 struct scsi_sense_hdr sshdr
;
185 result
= scsi_execute_req(sdev
, cmd
, DMA_FROM_DEVICE
, buf
, sizeof(buf
),
186 &sshdr
, SR_TIMEOUT
, MAX_RETRIES
, NULL
);
187 if (scsi_sense_valid(&sshdr
) && sshdr
.sense_key
== UNIT_ATTENTION
)
188 return DISK_EVENT_MEDIA_CHANGE
;
190 if (result
|| be16_to_cpu(eh
->data_len
) < sizeof(*med
))
193 if (eh
->nea
|| eh
->notification_class
!= 0x4)
196 if (med
->media_event_code
== 1)
197 return DISK_EVENT_EJECT_REQUEST
;
198 else if (med
->media_event_code
== 2)
199 return DISK_EVENT_MEDIA_CHANGE
;
204 * This function checks to see if the media has been changed or eject
205 * button has been pressed. It is possible that we have already
206 * sensed a change, or the drive may have sensed one and not yet
207 * reported it. The past events are accumulated in sdev->changed and
208 * returned together with the current state.
210 static unsigned int sr_check_events(struct cdrom_device_info
*cdi
,
211 unsigned int clearing
, int slot
)
213 struct scsi_cd
*cd
= cdi
->handle
;
215 struct scsi_sense_hdr sshdr
;
219 /* no changer support */
220 if (CDSL_CURRENT
!= slot
)
223 events
= sr_get_events(cd
->device
);
225 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
226 * is being cleared. Note that there are devices which hang
227 * if asked to execute TUR repeatedly.
229 if (!(clearing
& DISK_EVENT_MEDIA_CHANGE
))
232 /* let's see whether the media is there with TUR */
233 last_present
= cd
->media_present
;
234 ret
= scsi_test_unit_ready(cd
->device
, SR_TIMEOUT
, MAX_RETRIES
, &sshdr
);
237 * Media is considered to be present if TUR succeeds or fails with
238 * sense data indicating something other than media-not-present
241 cd
->media_present
= scsi_status_is_good(ret
) ||
242 (scsi_sense_valid(&sshdr
) && sshdr
.asc
!= 0x3a);
244 if (last_present
!= cd
->media_present
)
245 events
|= DISK_EVENT_MEDIA_CHANGE
;
247 if (cd
->device
->changed
) {
248 events
|= DISK_EVENT_MEDIA_CHANGE
;
249 cd
->device
->changed
= 0;
252 /* for backward compatibility */
253 if (events
& DISK_EVENT_MEDIA_CHANGE
)
254 sdev_evt_send_simple(cd
->device
, SDEV_EVT_MEDIA_CHANGE
,
260 * sr_done is the interrupt routine for the device driver.
262 * It will be notified on the end of a SCSI read / write, and will take one
263 * of several actions based on success or failure.
265 static int sr_done(struct scsi_cmnd
*SCpnt
)
267 int result
= SCpnt
->result
;
268 int this_count
= scsi_bufflen(SCpnt
);
269 int good_bytes
= (result
== 0 ? this_count
: 0);
270 int block_sectors
= 0;
272 struct scsi_cd
*cd
= scsi_cd(SCpnt
->request
->rq_disk
);
275 printk("sr.c done: %x\n", result
);
279 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
280 * success. Since this is a relatively rare error condition, no
281 * care is taken to avoid unnecessary additional work such as
282 * memcpy's that could be avoided.
284 if (driver_byte(result
) != 0 && /* An error occurred */
285 (SCpnt
->sense_buffer
[0] & 0x7f) == 0x70) { /* Sense current */
286 switch (SCpnt
->sense_buffer
[2]) {
288 case VOLUME_OVERFLOW
:
289 case ILLEGAL_REQUEST
:
290 if (!(SCpnt
->sense_buffer
[0] & 0x90))
292 error_sector
= (SCpnt
->sense_buffer
[3] << 24) |
293 (SCpnt
->sense_buffer
[4] << 16) |
294 (SCpnt
->sense_buffer
[5] << 8) |
295 SCpnt
->sense_buffer
[6];
296 if (SCpnt
->request
->bio
!= NULL
)
298 bio_sectors(SCpnt
->request
->bio
);
299 if (block_sectors
< 4)
301 if (cd
->device
->sector_size
== 2048)
303 error_sector
&= ~(block_sectors
- 1);
304 good_bytes
= (error_sector
-
305 blk_rq_pos(SCpnt
->request
)) << 9;
306 if (good_bytes
< 0 || good_bytes
>= this_count
)
309 * The SCSI specification allows for the value
310 * returned by READ CAPACITY to be up to 75 2K
311 * sectors past the last readable block.
312 * Therefore, if we hit a medium error within the
313 * last 75 2K sectors, we decrease the saved size
316 if (error_sector
< get_capacity(cd
->disk
) &&
317 cd
->capacity
- error_sector
< 4 * 75)
318 set_capacity(cd
->disk
, error_sector
);
321 case RECOVERED_ERROR
:
322 good_bytes
= this_count
;
333 static int sr_prep_fn(struct request_queue
*q
, struct request
*rq
)
335 int block
= 0, this_count
, s_size
;
337 struct scsi_cmnd
*SCpnt
;
338 struct scsi_device
*sdp
= q
->queuedata
;
341 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
342 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
344 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
348 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
349 if (ret
!= BLKPREP_OK
)
352 cd
= scsi_cd(rq
->rq_disk
);
354 /* from here on until we're complete, any goto out
355 * is used for a killable error condition */
358 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
359 cd
->disk
->disk_name
, block
));
361 if (!cd
->device
|| !scsi_device_online(cd
->device
)) {
362 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
363 blk_rq_sectors(rq
)));
364 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
368 if (cd
->device
->changed
) {
370 * quietly refuse to do anything to a changed disc until the
371 * changed bit has been reset
377 * we do lazy blocksize switching (when reading XA sectors,
378 * see CDROMREADMODE2 ioctl)
380 s_size
= cd
->device
->sector_size
;
383 sr_set_blocklength(cd
, 2048);
385 printk("sr: can't switch blocksize: in interrupt\n");
388 if (s_size
!= 512 && s_size
!= 1024 && s_size
!= 2048) {
389 scmd_printk(KERN_ERR
, SCpnt
, "bad sector size %d\n", s_size
);
393 if (rq_data_dir(rq
) == WRITE
) {
394 if (!cd
->device
->writeable
)
396 SCpnt
->cmnd
[0] = WRITE_10
;
397 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
398 cd
->cdi
.media_written
= 1;
399 } else if (rq_data_dir(rq
) == READ
) {
400 SCpnt
->cmnd
[0] = READ_10
;
401 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
403 blk_dump_rq_flags(rq
, "Unknown sr command");
408 struct scatterlist
*sg
;
409 int i
, size
= 0, sg_count
= scsi_sg_count(SCpnt
);
411 scsi_for_each_sg(SCpnt
, sg
, sg_count
, i
)
414 if (size
!= scsi_bufflen(SCpnt
)) {
415 scmd_printk(KERN_ERR
, SCpnt
,
416 "mismatch count %d, bytes %d\n",
417 size
, scsi_bufflen(SCpnt
));
418 if (scsi_bufflen(SCpnt
) > size
)
419 SCpnt
->sdb
.length
= size
;
424 * request doesn't start on hw block boundary, add scatter pads
426 if (((unsigned int)blk_rq_pos(rq
) % (s_size
>> 9)) ||
427 (scsi_bufflen(SCpnt
) % s_size
)) {
428 scmd_printk(KERN_NOTICE
, SCpnt
, "unaligned transfer\n");
432 this_count
= (scsi_bufflen(SCpnt
) >> 9) / (s_size
>> 9);
435 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
437 (rq_data_dir(rq
) == WRITE
) ?
438 "writing" : "reading",
439 this_count
, blk_rq_sectors(rq
)));
442 block
= (unsigned int)blk_rq_pos(rq
) / (s_size
>> 9);
444 if (this_count
> 0xffff) {
446 SCpnt
->sdb
.length
= this_count
* s_size
;
449 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
450 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
451 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
452 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
453 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
454 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
455 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
458 * We shouldn't disconnect in the middle of a sector, so with a dumb
459 * host adapter, it's safe to assume that we can at least transfer
460 * this many bytes between each connect / disconnect.
462 SCpnt
->transfersize
= cd
->device
->sector_size
;
463 SCpnt
->underflow
= this_count
<< 9;
464 SCpnt
->allowed
= MAX_RETRIES
;
467 * This indicates that the command is ready from our end to be
472 return scsi_prep_return(q
, rq
, ret
);
475 static int sr_block_open(struct block_device
*bdev
, fmode_t mode
)
480 mutex_lock(&sr_mutex
);
481 cd
= scsi_cd_get(bdev
->bd_disk
);
483 ret
= cdrom_open(&cd
->cdi
, bdev
, mode
);
487 mutex_unlock(&sr_mutex
);
491 static int sr_block_release(struct gendisk
*disk
, fmode_t mode
)
493 struct scsi_cd
*cd
= scsi_cd(disk
);
494 mutex_lock(&sr_mutex
);
495 cdrom_release(&cd
->cdi
, mode
);
497 mutex_unlock(&sr_mutex
);
501 static int sr_block_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned cmd
,
504 struct scsi_cd
*cd
= scsi_cd(bdev
->bd_disk
);
505 struct scsi_device
*sdev
= cd
->device
;
506 void __user
*argp
= (void __user
*)arg
;
509 mutex_lock(&sr_mutex
);
512 * Send SCSI addressing ioctls directly to mid level, send other
513 * ioctls to cdrom/block level.
516 case SCSI_IOCTL_GET_IDLUN
:
517 case SCSI_IOCTL_GET_BUS_NUMBER
:
518 ret
= scsi_ioctl(sdev
, cmd
, argp
);
522 ret
= cdrom_ioctl(&cd
->cdi
, bdev
, mode
, cmd
, arg
);
527 * ENODEV means that we didn't recognise the ioctl, or that we
528 * cannot execute it in the current device state. In either
529 * case fall through to scsi_ioctl, which will return ENDOEV again
530 * if it doesn't recognise the ioctl
532 ret
= scsi_nonblockable_ioctl(sdev
, cmd
, argp
,
533 (mode
& FMODE_NDELAY
) != 0);
536 ret
= scsi_ioctl(sdev
, cmd
, argp
);
539 mutex_unlock(&sr_mutex
);
543 static unsigned int sr_block_check_events(struct gendisk
*disk
,
544 unsigned int clearing
)
546 struct scsi_cd
*cd
= scsi_cd(disk
);
547 return cdrom_check_events(&cd
->cdi
, clearing
);
550 static int sr_block_revalidate_disk(struct gendisk
*disk
)
552 struct scsi_cd
*cd
= scsi_cd(disk
);
553 struct scsi_sense_hdr sshdr
;
555 /* if the unit is not ready, nothing more to do */
556 if (scsi_test_unit_ready(cd
->device
, SR_TIMEOUT
, MAX_RETRIES
, &sshdr
))
559 sr_cd_check(&cd
->cdi
);
564 static const struct block_device_operations sr_bdops
=
566 .owner
= THIS_MODULE
,
567 .open
= sr_block_open
,
568 .release
= sr_block_release
,
569 .ioctl
= sr_block_ioctl
,
570 .check_events
= sr_block_check_events
,
571 .revalidate_disk
= sr_block_revalidate_disk
,
573 * No compat_ioctl for now because sr_block_ioctl never
574 * seems to pass arbitary ioctls down to host drivers.
578 static int sr_open(struct cdrom_device_info
*cdi
, int purpose
)
580 struct scsi_cd
*cd
= cdi
->handle
;
581 struct scsi_device
*sdev
= cd
->device
;
585 * If the device is in error recovery, wait until it is done.
586 * If the device is offline, then disallow any access to it.
589 if (!scsi_block_when_processing_errors(sdev
))
598 static void sr_release(struct cdrom_device_info
*cdi
)
600 struct scsi_cd
*cd
= cdi
->handle
;
602 if (cd
->device
->sector_size
> 2048)
603 sr_set_blocklength(cd
, 2048);
607 static int sr_probe(struct device
*dev
)
609 struct scsi_device
*sdev
= to_scsi_device(dev
);
610 struct gendisk
*disk
;
615 if (sdev
->type
!= TYPE_ROM
&& sdev
->type
!= TYPE_WORM
)
619 cd
= kzalloc(sizeof(*cd
), GFP_KERNEL
);
623 kref_init(&cd
->kref
);
625 disk
= alloc_disk(1);
629 spin_lock(&sr_index_lock
);
630 minor
= find_first_zero_bit(sr_index_bits
, SR_DISKS
);
631 if (minor
== SR_DISKS
) {
632 spin_unlock(&sr_index_lock
);
636 __set_bit(minor
, sr_index_bits
);
637 spin_unlock(&sr_index_lock
);
639 disk
->major
= SCSI_CDROM_MAJOR
;
640 disk
->first_minor
= minor
;
641 sprintf(disk
->disk_name
, "sr%d", minor
);
642 disk
->fops
= &sr_bdops
;
643 disk
->flags
= GENHD_FL_CD
;
644 disk
->events
= DISK_EVENT_MEDIA_CHANGE
| DISK_EVENT_EJECT_REQUEST
;
646 blk_queue_rq_timeout(sdev
->request_queue
, SR_TIMEOUT
);
650 cd
->driver
= &sr_template
;
652 cd
->capacity
= 0x1fffff;
653 cd
->device
->changed
= 1; /* force recheck CD type */
654 cd
->media_present
= 1;
656 cd
->readcd_known
= 0;
659 cd
->cdi
.ops
= &sr_dops
;
662 cd
->cdi
.capacity
= 1;
663 sprintf(cd
->cdi
.name
, "sr%d", minor
);
665 sdev
->sector_size
= 2048; /* A guess, just in case */
667 /* FIXME: need to handle a get_capabilities failure properly ?? */
668 get_capabilities(cd
);
669 blk_queue_prep_rq(sdev
->request_queue
, sr_prep_fn
);
672 disk
->driverfs_dev
= &sdev
->sdev_gendev
;
673 set_capacity(disk
, cd
->capacity
);
674 disk
->private_data
= &cd
->driver
;
675 disk
->queue
= sdev
->request_queue
;
678 if (register_cdrom(&cd
->cdi
))
681 dev_set_drvdata(dev
, cd
);
682 disk
->flags
|= GENHD_FL_REMOVABLE
;
685 sdev_printk(KERN_DEBUG
, sdev
,
686 "Attached scsi CD-ROM %s\n", cd
->cdi
.name
);
698 static void get_sectorsize(struct scsi_cd
*cd
)
700 unsigned char cmd
[10];
701 unsigned char buffer
[8];
702 int the_result
, retries
= 3;
704 struct request_queue
*queue
;
707 cmd
[0] = READ_CAPACITY
;
708 memset((void *) &cmd
[1], 0, 9);
709 memset(buffer
, 0, sizeof(buffer
));
711 /* Do the command and wait.. */
712 the_result
= scsi_execute_req(cd
->device
, cmd
, DMA_FROM_DEVICE
,
713 buffer
, sizeof(buffer
), NULL
,
714 SR_TIMEOUT
, MAX_RETRIES
, NULL
);
718 } while (the_result
&& retries
);
722 cd
->capacity
= 0x1fffff;
723 sector_size
= 2048; /* A guess, just in case */
727 cd
->capacity
= 1 + ((buffer
[0] << 24) | (buffer
[1] << 16) |
728 (buffer
[2] << 8) | buffer
[3]);
730 * READ_CAPACITY doesn't return the correct size on
731 * certain UDF media. If last_written is larger, use
734 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
736 if (!cdrom_get_last_written(&cd
->cdi
, &last_written
))
737 cd
->capacity
= max_t(long, cd
->capacity
, last_written
);
739 sector_size
= (buffer
[4] << 24) |
740 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
741 switch (sector_size
) {
743 * HP 4020i CD-Recorder reports 2340 byte sectors
744 * Philips CD-Writers report 2352 byte sectors
746 * Use 2k sectors for them..
759 printk("%s: unsupported sector size %d.\n",
760 cd
->cdi
.name
, sector_size
);
764 cd
->device
->sector_size
= sector_size
;
767 * Add this so that we have the ability to correctly gauge
768 * what the device is capable of.
770 set_capacity(cd
->disk
, cd
->capacity
);
773 queue
= cd
->device
->request_queue
;
774 blk_queue_logical_block_size(queue
, sector_size
);
779 static void get_capabilities(struct scsi_cd
*cd
)
781 unsigned char *buffer
;
782 struct scsi_mode_data data
;
783 struct scsi_sense_hdr sshdr
;
786 static const char *loadmech
[] =
799 /* allocate transfer buffer */
800 buffer
= kmalloc(512, GFP_KERNEL
| GFP_DMA
);
802 printk(KERN_ERR
"sr: out of memory.\n");
806 /* eat unit attentions */
807 scsi_test_unit_ready(cd
->device
, SR_TIMEOUT
, MAX_RETRIES
, &sshdr
);
809 /* ask for mode page 0x2a */
810 rc
= scsi_mode_sense(cd
->device
, 0, 0x2a, buffer
, 128,
811 SR_TIMEOUT
, 3, &data
, NULL
);
813 if (!scsi_status_is_good(rc
)) {
814 /* failed, drive doesn't have capabilities mode page */
816 cd
->cdi
.mask
|= (CDC_CD_R
| CDC_CD_RW
| CDC_DVD_R
|
817 CDC_DVD
| CDC_DVD_RAM
|
818 CDC_SELECT_DISC
| CDC_SELECT_SPEED
|
819 CDC_MRW
| CDC_MRW_W
| CDC_RAM
);
821 printk("%s: scsi-1 drive\n", cd
->cdi
.name
);
825 n
= data
.header_length
+ data
.block_descriptor_length
;
826 cd
->cdi
.speed
= ((buffer
[n
+ 8] << 8) + buffer
[n
+ 9]) / 176;
827 cd
->readcd_known
= 1;
828 cd
->readcd_cdda
= buffer
[n
+ 5] & 0x01;
829 /* print some capability bits */
830 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd
->cdi
.name
,
831 ((buffer
[n
+ 14] << 8) + buffer
[n
+ 15]) / 176,
833 buffer
[n
+ 3] & 0x01 ? "writer " : "", /* CD Writer */
834 buffer
[n
+ 3] & 0x20 ? "dvd-ram " : "",
835 buffer
[n
+ 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
836 buffer
[n
+ 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
837 buffer
[n
+ 5] & 0x01 ? "cdda " : "", /* can read audio data */
838 loadmech
[buffer
[n
+ 6] >> 5]);
839 if ((buffer
[n
+ 6] >> 5) == 0)
840 /* caddy drives can't close tray... */
841 cd
->cdi
.mask
|= CDC_CLOSE_TRAY
;
842 if ((buffer
[n
+ 2] & 0x8) == 0)
843 /* not a DVD drive */
844 cd
->cdi
.mask
|= CDC_DVD
;
845 if ((buffer
[n
+ 3] & 0x20) == 0)
846 /* can't write DVD-RAM media */
847 cd
->cdi
.mask
|= CDC_DVD_RAM
;
848 if ((buffer
[n
+ 3] & 0x10) == 0)
849 /* can't write DVD-R media */
850 cd
->cdi
.mask
|= CDC_DVD_R
;
851 if ((buffer
[n
+ 3] & 0x2) == 0)
852 /* can't write CD-RW media */
853 cd
->cdi
.mask
|= CDC_CD_RW
;
854 if ((buffer
[n
+ 3] & 0x1) == 0)
855 /* can't write CD-R media */
856 cd
->cdi
.mask
|= CDC_CD_R
;
857 if ((buffer
[n
+ 6] & 0x8) == 0)
859 cd
->cdi
.mask
|= CDC_OPEN_TRAY
;
861 if ((buffer
[n
+ 6] >> 5) == mechtype_individual_changer
||
862 (buffer
[n
+ 6] >> 5) == mechtype_cartridge_changer
)
864 cdrom_number_of_slots(&cd
->cdi
);
865 if (cd
->cdi
.capacity
<= 1)
867 cd
->cdi
.mask
|= CDC_SELECT_DISC
;
868 /*else I don't think it can close its tray
869 cd->cdi.mask |= CDC_CLOSE_TRAY; */
872 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
874 if ((cd
->cdi
.mask
& (CDC_DVD_RAM
| CDC_MRW_W
| CDC_RAM
| CDC_CD_RW
)) !=
875 (CDC_DVD_RAM
| CDC_MRW_W
| CDC_RAM
| CDC_CD_RW
)) {
876 cd
->device
->writeable
= 1;
883 * sr_packet() is the entry point for the generic commands generated
884 * by the Uniform CD-ROM layer.
886 static int sr_packet(struct cdrom_device_info
*cdi
,
887 struct packet_command
*cgc
)
889 struct scsi_cd
*cd
= cdi
->handle
;
890 struct scsi_device
*sdev
= cd
->device
;
892 if (cgc
->cmd
[0] == GPCMD_READ_DISC_INFO
&& sdev
->no_read_disc_info
)
893 return -EDRIVE_CANT_DO_THIS
;
895 if (cgc
->timeout
<= 0)
896 cgc
->timeout
= IOCTL_TIMEOUT
;
898 sr_do_ioctl(cd
, cgc
);
904 * sr_kref_release - Called to free the scsi_cd structure
905 * @kref: pointer to embedded kref
907 * sr_ref_mutex must be held entering this routine. Because it is
908 * called on last put, you should always use the scsi_cd_get()
909 * scsi_cd_put() helpers which manipulate the semaphore directly
910 * and never do a direct kref_put().
912 static void sr_kref_release(struct kref
*kref
)
914 struct scsi_cd
*cd
= container_of(kref
, struct scsi_cd
, kref
);
915 struct gendisk
*disk
= cd
->disk
;
917 spin_lock(&sr_index_lock
);
918 clear_bit(MINOR(disk_devt(disk
)), sr_index_bits
);
919 spin_unlock(&sr_index_lock
);
921 unregister_cdrom(&cd
->cdi
);
923 disk
->private_data
= NULL
;
930 static int sr_remove(struct device
*dev
)
932 struct scsi_cd
*cd
= dev_get_drvdata(dev
);
934 blk_queue_prep_rq(cd
->device
->request_queue
, scsi_prep_fn
);
935 del_gendisk(cd
->disk
);
937 mutex_lock(&sr_ref_mutex
);
938 kref_put(&cd
->kref
, sr_kref_release
);
939 mutex_unlock(&sr_ref_mutex
);
944 static int __init
init_sr(void)
948 rc
= register_blkdev(SCSI_CDROM_MAJOR
, "sr");
951 rc
= scsi_register_driver(&sr_template
.gendrv
);
953 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
958 static void __exit
exit_sr(void)
960 scsi_unregister_driver(&sr_template
.gendrv
);
961 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
964 module_init(init_sr
);
965 module_exit(exit_sr
);
966 MODULE_LICENSE("GPL");