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 int sr_media_change(struct cdrom_device_info
*, int);
108 static int sr_packet(struct cdrom_device_info
*, struct packet_command
*);
110 static struct cdrom_device_ops sr_dops
= {
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
,
121 .audio_ioctl
= sr_audio_ioctl
,
122 .capability
= SR_CAPABILITIES
,
123 .generic_packet
= sr_packet
,
126 static void sr_kref_release(struct kref
*kref
);
128 static inline struct scsi_cd
*scsi_cd(struct gendisk
*disk
)
130 return container_of(disk
->private_data
, struct scsi_cd
, driver
);
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.
137 static inline struct scsi_cd
*scsi_cd_get(struct gendisk
*disk
)
139 struct scsi_cd
*cd
= NULL
;
141 mutex_lock(&sr_ref_mutex
);
142 if (disk
->private_data
== NULL
)
146 if (scsi_device_get(cd
->device
))
151 kref_put(&cd
->kref
, sr_kref_release
);
154 mutex_unlock(&sr_ref_mutex
);
158 static void scsi_cd_put(struct scsi_cd
*cd
)
160 struct scsi_device
*sdev
= cd
->device
;
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
);
168 /* identical to scsi_test_unit_ready except that it doesn't
169 * eat the NOT_READY returns for removable media */
170 int sr_test_unit_ready(struct scsi_device
*sdev
, struct scsi_sense_hdr
*sshdr
)
172 int retries
= MAX_RETRIES
;
174 u8 cmd
[] = {TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
176 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
177 * conditions are gone, or a timeout happens
180 the_result
= scsi_execute_req(sdev
, cmd
, DMA_NONE
, NULL
,
181 0, sshdr
, SR_TIMEOUT
,
183 if (scsi_sense_valid(sshdr
) &&
184 sshdr
->sense_key
== UNIT_ATTENTION
)
187 } while (retries
> 0 &&
188 (!scsi_status_is_good(the_result
) ||
189 (scsi_sense_valid(sshdr
) &&
190 sshdr
->sense_key
== UNIT_ATTENTION
)));
195 * This function checks to see if the media has been changed in the
196 * CDROM drive. It is possible that we have already sensed a change,
197 * or the drive may have sensed one and not yet reported it. We must
198 * be ready for either case. This function always reports the current
199 * value of the changed bit. If flag is 0, then the changed bit is reset.
200 * This function could be done as an ioctl, but we would need to have
201 * an inode for that to work, and we do not always have one.
204 static int sr_media_change(struct cdrom_device_info
*cdi
, int slot
)
206 struct scsi_cd
*cd
= cdi
->handle
;
208 struct scsi_sense_hdr
*sshdr
;
210 if (CDSL_CURRENT
!= slot
) {
211 /* no changer support */
215 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
216 retval
= sr_test_unit_ready(cd
->device
, sshdr
);
218 * Media is considered to be present if TUR succeeds or fails with
219 * sense data indicating something other than media-not-present
222 if (!scsi_status_is_good(retval
) &&
223 (!scsi_sense_valid(sshdr
) || sshdr
->asc
== 0x3a)) {
225 * Probably no media in the device. Mark as changed, and
226 * we will figure it out later once the drive is available
229 cd
->device
->changed
= 1;
230 /* This will force a flush, if called from check_disk_change */
235 retval
= cd
->device
->changed
;
236 cd
->device
->changed
= 0;
237 /* If the disk changed, the capacity will now be different,
238 * so we force a re-read of this information */
240 /* check multisession offset etc */
246 /* Notify userspace, that media has changed. */
247 if (retval
!= cd
->previous_state
)
248 sdev_evt_send_simple(cd
->device
, SDEV_EVT_MEDIA_CHANGE
,
250 cd
->previous_state
= retval
;
257 * sr_done is the interrupt routine for the device driver.
259 * It will be notified on the end of a SCSI read / write, and will take one
260 * of several actions based on success or failure.
262 static int sr_done(struct scsi_cmnd
*SCpnt
)
264 int result
= SCpnt
->result
;
265 int this_count
= scsi_bufflen(SCpnt
);
266 int good_bytes
= (result
== 0 ? this_count
: 0);
267 int block_sectors
= 0;
269 struct scsi_cd
*cd
= scsi_cd(SCpnt
->request
->rq_disk
);
272 printk("sr.c done: %x\n", result
);
276 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
277 * success. Since this is a relatively rare error condition, no
278 * care is taken to avoid unnecessary additional work such as
279 * memcpy's that could be avoided.
281 if (driver_byte(result
) != 0 && /* An error occurred */
282 (SCpnt
->sense_buffer
[0] & 0x7f) == 0x70) { /* Sense current */
283 switch (SCpnt
->sense_buffer
[2]) {
285 case VOLUME_OVERFLOW
:
286 case ILLEGAL_REQUEST
:
287 if (!(SCpnt
->sense_buffer
[0] & 0x90))
289 error_sector
= (SCpnt
->sense_buffer
[3] << 24) |
290 (SCpnt
->sense_buffer
[4] << 16) |
291 (SCpnt
->sense_buffer
[5] << 8) |
292 SCpnt
->sense_buffer
[6];
293 if (SCpnt
->request
->bio
!= NULL
)
295 bio_sectors(SCpnt
->request
->bio
);
296 if (block_sectors
< 4)
298 if (cd
->device
->sector_size
== 2048)
300 error_sector
&= ~(block_sectors
- 1);
301 good_bytes
= (error_sector
-
302 blk_rq_pos(SCpnt
->request
)) << 9;
303 if (good_bytes
< 0 || good_bytes
>= this_count
)
306 * The SCSI specification allows for the value
307 * returned by READ CAPACITY to be up to 75 2K
308 * sectors past the last readable block.
309 * Therefore, if we hit a medium error within the
310 * last 75 2K sectors, we decrease the saved size
313 if (error_sector
< get_capacity(cd
->disk
) &&
314 cd
->capacity
- error_sector
< 4 * 75)
315 set_capacity(cd
->disk
, error_sector
);
318 case RECOVERED_ERROR
:
319 good_bytes
= this_count
;
330 static int sr_prep_fn(struct request_queue
*q
, struct request
*rq
)
332 int block
= 0, this_count
, s_size
;
334 struct scsi_cmnd
*SCpnt
;
335 struct scsi_device
*sdp
= q
->queuedata
;
338 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
339 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
341 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
345 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
346 if (ret
!= BLKPREP_OK
)
349 cd
= scsi_cd(rq
->rq_disk
);
351 /* from here on until we're complete, any goto out
352 * is used for a killable error condition */
355 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
356 cd
->disk
->disk_name
, block
));
358 if (!cd
->device
|| !scsi_device_online(cd
->device
)) {
359 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
360 blk_rq_sectors(rq
)));
361 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
365 if (cd
->device
->changed
) {
367 * quietly refuse to do anything to a changed disc until the
368 * changed bit has been reset
374 * we do lazy blocksize switching (when reading XA sectors,
375 * see CDROMREADMODE2 ioctl)
377 s_size
= cd
->device
->sector_size
;
380 sr_set_blocklength(cd
, 2048);
382 printk("sr: can't switch blocksize: in interrupt\n");
385 if (s_size
!= 512 && s_size
!= 1024 && s_size
!= 2048) {
386 scmd_printk(KERN_ERR
, SCpnt
, "bad sector size %d\n", s_size
);
390 if (rq_data_dir(rq
) == WRITE
) {
391 if (!cd
->device
->writeable
)
393 SCpnt
->cmnd
[0] = WRITE_10
;
394 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
395 cd
->cdi
.media_written
= 1;
396 } else if (rq_data_dir(rq
) == READ
) {
397 SCpnt
->cmnd
[0] = READ_10
;
398 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
400 blk_dump_rq_flags(rq
, "Unknown sr command");
405 struct scatterlist
*sg
;
406 int i
, size
= 0, sg_count
= scsi_sg_count(SCpnt
);
408 scsi_for_each_sg(SCpnt
, sg
, sg_count
, i
)
411 if (size
!= scsi_bufflen(SCpnt
)) {
412 scmd_printk(KERN_ERR
, SCpnt
,
413 "mismatch count %d, bytes %d\n",
414 size
, scsi_bufflen(SCpnt
));
415 if (scsi_bufflen(SCpnt
) > size
)
416 SCpnt
->sdb
.length
= size
;
421 * request doesn't start on hw block boundary, add scatter pads
423 if (((unsigned int)blk_rq_pos(rq
) % (s_size
>> 9)) ||
424 (scsi_bufflen(SCpnt
) % s_size
)) {
425 scmd_printk(KERN_NOTICE
, SCpnt
, "unaligned transfer\n");
429 this_count
= (scsi_bufflen(SCpnt
) >> 9) / (s_size
>> 9);
432 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
434 (rq_data_dir(rq
) == WRITE
) ?
435 "writing" : "reading",
436 this_count
, blk_rq_sectors(rq
)));
439 block
= (unsigned int)blk_rq_pos(rq
) / (s_size
>> 9);
441 if (this_count
> 0xffff) {
443 SCpnt
->sdb
.length
= this_count
* s_size
;
446 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
447 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
448 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
449 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
450 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
451 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
452 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
455 * We shouldn't disconnect in the middle of a sector, so with a dumb
456 * host adapter, it's safe to assume that we can at least transfer
457 * this many bytes between each connect / disconnect.
459 SCpnt
->transfersize
= cd
->device
->sector_size
;
460 SCpnt
->underflow
= this_count
<< 9;
461 SCpnt
->allowed
= MAX_RETRIES
;
464 * This indicates that the command is ready from our end to be
469 return scsi_prep_return(q
, rq
, ret
);
472 static int sr_block_open(struct block_device
*bdev
, fmode_t mode
)
477 mutex_lock(&sr_mutex
);
478 cd
= scsi_cd_get(bdev
->bd_disk
);
480 ret
= cdrom_open(&cd
->cdi
, bdev
, mode
);
484 mutex_unlock(&sr_mutex
);
488 static int sr_block_release(struct gendisk
*disk
, fmode_t mode
)
490 struct scsi_cd
*cd
= scsi_cd(disk
);
491 mutex_lock(&sr_mutex
);
492 cdrom_release(&cd
->cdi
, mode
);
494 mutex_unlock(&sr_mutex
);
498 static int sr_block_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned cmd
,
501 struct scsi_cd
*cd
= scsi_cd(bdev
->bd_disk
);
502 struct scsi_device
*sdev
= cd
->device
;
503 void __user
*argp
= (void __user
*)arg
;
506 mutex_lock(&sr_mutex
);
509 * Send SCSI addressing ioctls directly to mid level, send other
510 * ioctls to cdrom/block level.
513 case SCSI_IOCTL_GET_IDLUN
:
514 case SCSI_IOCTL_GET_BUS_NUMBER
:
515 ret
= scsi_ioctl(sdev
, cmd
, argp
);
519 ret
= cdrom_ioctl(&cd
->cdi
, bdev
, mode
, cmd
, arg
);
524 * ENODEV means that we didn't recognise the ioctl, or that we
525 * cannot execute it in the current device state. In either
526 * case fall through to scsi_ioctl, which will return ENDOEV again
527 * if it doesn't recognise the ioctl
529 ret
= scsi_nonblockable_ioctl(sdev
, cmd
, argp
,
530 (mode
& FMODE_NDELAY
) != 0);
533 ret
= scsi_ioctl(sdev
, cmd
, argp
);
536 mutex_unlock(&sr_mutex
);
540 static int sr_block_media_changed(struct gendisk
*disk
)
542 struct scsi_cd
*cd
= scsi_cd(disk
);
543 return cdrom_media_changed(&cd
->cdi
);
546 static const struct block_device_operations sr_bdops
=
548 .owner
= THIS_MODULE
,
549 .open
= sr_block_open
,
550 .release
= sr_block_release
,
551 .ioctl
= sr_block_ioctl
,
552 .media_changed
= sr_block_media_changed
,
554 * No compat_ioctl for now because sr_block_ioctl never
555 * seems to pass arbitary ioctls down to host drivers.
559 static int sr_open(struct cdrom_device_info
*cdi
, int purpose
)
561 struct scsi_cd
*cd
= cdi
->handle
;
562 struct scsi_device
*sdev
= cd
->device
;
566 * If the device is in error recovery, wait until it is done.
567 * If the device is offline, then disallow any access to it.
570 if (!scsi_block_when_processing_errors(sdev
))
579 static void sr_release(struct cdrom_device_info
*cdi
)
581 struct scsi_cd
*cd
= cdi
->handle
;
583 if (cd
->device
->sector_size
> 2048)
584 sr_set_blocklength(cd
, 2048);
588 static int sr_probe(struct device
*dev
)
590 struct scsi_device
*sdev
= to_scsi_device(dev
);
591 struct gendisk
*disk
;
596 if (sdev
->type
!= TYPE_ROM
&& sdev
->type
!= TYPE_WORM
)
600 cd
= kzalloc(sizeof(*cd
), GFP_KERNEL
);
604 kref_init(&cd
->kref
);
606 disk
= alloc_disk(1);
610 spin_lock(&sr_index_lock
);
611 minor
= find_first_zero_bit(sr_index_bits
, SR_DISKS
);
612 if (minor
== SR_DISKS
) {
613 spin_unlock(&sr_index_lock
);
617 __set_bit(minor
, sr_index_bits
);
618 spin_unlock(&sr_index_lock
);
620 disk
->major
= SCSI_CDROM_MAJOR
;
621 disk
->first_minor
= minor
;
622 sprintf(disk
->disk_name
, "sr%d", minor
);
623 disk
->fops
= &sr_bdops
;
624 disk
->flags
= GENHD_FL_CD
;
626 blk_queue_rq_timeout(sdev
->request_queue
, SR_TIMEOUT
);
630 cd
->driver
= &sr_template
;
632 cd
->capacity
= 0x1fffff;
633 cd
->device
->changed
= 1; /* force recheck CD type */
634 cd
->previous_state
= 1;
636 cd
->readcd_known
= 0;
639 cd
->cdi
.ops
= &sr_dops
;
642 cd
->cdi
.capacity
= 1;
643 sprintf(cd
->cdi
.name
, "sr%d", minor
);
645 sdev
->sector_size
= 2048; /* A guess, just in case */
647 /* FIXME: need to handle a get_capabilities failure properly ?? */
648 get_capabilities(cd
);
649 blk_queue_prep_rq(sdev
->request_queue
, sr_prep_fn
);
652 disk
->driverfs_dev
= &sdev
->sdev_gendev
;
653 set_capacity(disk
, cd
->capacity
);
654 disk
->private_data
= &cd
->driver
;
655 disk
->queue
= sdev
->request_queue
;
658 if (register_cdrom(&cd
->cdi
))
661 dev_set_drvdata(dev
, cd
);
662 disk
->flags
|= GENHD_FL_REMOVABLE
;
665 sdev_printk(KERN_DEBUG
, sdev
,
666 "Attached scsi CD-ROM %s\n", cd
->cdi
.name
);
678 static void get_sectorsize(struct scsi_cd
*cd
)
680 unsigned char cmd
[10];
681 unsigned char buffer
[8];
682 int the_result
, retries
= 3;
684 struct request_queue
*queue
;
687 cmd
[0] = READ_CAPACITY
;
688 memset((void *) &cmd
[1], 0, 9);
689 memset(buffer
, 0, sizeof(buffer
));
691 /* Do the command and wait.. */
692 the_result
= scsi_execute_req(cd
->device
, cmd
, DMA_FROM_DEVICE
,
693 buffer
, sizeof(buffer
), NULL
,
694 SR_TIMEOUT
, MAX_RETRIES
, NULL
);
698 } while (the_result
&& retries
);
702 cd
->capacity
= 0x1fffff;
703 sector_size
= 2048; /* A guess, just in case */
707 cd
->capacity
= 1 + ((buffer
[0] << 24) | (buffer
[1] << 16) |
708 (buffer
[2] << 8) | buffer
[3]);
710 * READ_CAPACITY doesn't return the correct size on
711 * certain UDF media. If last_written is larger, use
714 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
716 if (!cdrom_get_last_written(&cd
->cdi
, &last_written
))
717 cd
->capacity
= max_t(long, cd
->capacity
, last_written
);
719 sector_size
= (buffer
[4] << 24) |
720 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
721 switch (sector_size
) {
723 * HP 4020i CD-Recorder reports 2340 byte sectors
724 * Philips CD-Writers report 2352 byte sectors
726 * Use 2k sectors for them..
739 printk("%s: unsupported sector size %d.\n",
740 cd
->cdi
.name
, sector_size
);
744 cd
->device
->sector_size
= sector_size
;
747 * Add this so that we have the ability to correctly gauge
748 * what the device is capable of.
750 set_capacity(cd
->disk
, cd
->capacity
);
753 queue
= cd
->device
->request_queue
;
754 blk_queue_logical_block_size(queue
, sector_size
);
759 static void get_capabilities(struct scsi_cd
*cd
)
761 unsigned char *buffer
;
762 struct scsi_mode_data data
;
763 struct scsi_sense_hdr sshdr
;
766 static const char *loadmech
[] =
779 /* allocate transfer buffer */
780 buffer
= kmalloc(512, GFP_KERNEL
| GFP_DMA
);
782 printk(KERN_ERR
"sr: out of memory.\n");
786 /* eat unit attentions */
787 sr_test_unit_ready(cd
->device
, &sshdr
);
789 /* ask for mode page 0x2a */
790 rc
= scsi_mode_sense(cd
->device
, 0, 0x2a, buffer
, 128,
791 SR_TIMEOUT
, 3, &data
, NULL
);
793 if (!scsi_status_is_good(rc
)) {
794 /* failed, drive doesn't have capabilities mode page */
796 cd
->cdi
.mask
|= (CDC_CD_R
| CDC_CD_RW
| CDC_DVD_R
|
797 CDC_DVD
| CDC_DVD_RAM
|
798 CDC_SELECT_DISC
| CDC_SELECT_SPEED
|
799 CDC_MRW
| CDC_MRW_W
| CDC_RAM
);
801 printk("%s: scsi-1 drive\n", cd
->cdi
.name
);
805 n
= data
.header_length
+ data
.block_descriptor_length
;
806 cd
->cdi
.speed
= ((buffer
[n
+ 8] << 8) + buffer
[n
+ 9]) / 176;
807 cd
->readcd_known
= 1;
808 cd
->readcd_cdda
= buffer
[n
+ 5] & 0x01;
809 /* print some capability bits */
810 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd
->cdi
.name
,
811 ((buffer
[n
+ 14] << 8) + buffer
[n
+ 15]) / 176,
813 buffer
[n
+ 3] & 0x01 ? "writer " : "", /* CD Writer */
814 buffer
[n
+ 3] & 0x20 ? "dvd-ram " : "",
815 buffer
[n
+ 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
816 buffer
[n
+ 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
817 buffer
[n
+ 5] & 0x01 ? "cdda " : "", /* can read audio data */
818 loadmech
[buffer
[n
+ 6] >> 5]);
819 if ((buffer
[n
+ 6] >> 5) == 0)
820 /* caddy drives can't close tray... */
821 cd
->cdi
.mask
|= CDC_CLOSE_TRAY
;
822 if ((buffer
[n
+ 2] & 0x8) == 0)
823 /* not a DVD drive */
824 cd
->cdi
.mask
|= CDC_DVD
;
825 if ((buffer
[n
+ 3] & 0x20) == 0)
826 /* can't write DVD-RAM media */
827 cd
->cdi
.mask
|= CDC_DVD_RAM
;
828 if ((buffer
[n
+ 3] & 0x10) == 0)
829 /* can't write DVD-R media */
830 cd
->cdi
.mask
|= CDC_DVD_R
;
831 if ((buffer
[n
+ 3] & 0x2) == 0)
832 /* can't write CD-RW media */
833 cd
->cdi
.mask
|= CDC_CD_RW
;
834 if ((buffer
[n
+ 3] & 0x1) == 0)
835 /* can't write CD-R media */
836 cd
->cdi
.mask
|= CDC_CD_R
;
837 if ((buffer
[n
+ 6] & 0x8) == 0)
839 cd
->cdi
.mask
|= CDC_OPEN_TRAY
;
841 if ((buffer
[n
+ 6] >> 5) == mechtype_individual_changer
||
842 (buffer
[n
+ 6] >> 5) == mechtype_cartridge_changer
)
844 cdrom_number_of_slots(&cd
->cdi
);
845 if (cd
->cdi
.capacity
<= 1)
847 cd
->cdi
.mask
|= CDC_SELECT_DISC
;
848 /*else I don't think it can close its tray
849 cd->cdi.mask |= CDC_CLOSE_TRAY; */
852 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
854 if ((cd
->cdi
.mask
& (CDC_DVD_RAM
| CDC_MRW_W
| CDC_RAM
| CDC_CD_RW
)) !=
855 (CDC_DVD_RAM
| CDC_MRW_W
| CDC_RAM
| CDC_CD_RW
)) {
856 cd
->device
->writeable
= 1;
863 * sr_packet() is the entry point for the generic commands generated
864 * by the Uniform CD-ROM layer.
866 static int sr_packet(struct cdrom_device_info
*cdi
,
867 struct packet_command
*cgc
)
869 struct scsi_cd
*cd
= cdi
->handle
;
870 struct scsi_device
*sdev
= cd
->device
;
872 if (cgc
->cmd
[0] == GPCMD_READ_DISC_INFO
&& sdev
->no_read_disc_info
)
873 return -EDRIVE_CANT_DO_THIS
;
875 if (cgc
->timeout
<= 0)
876 cgc
->timeout
= IOCTL_TIMEOUT
;
878 sr_do_ioctl(cd
, cgc
);
884 * sr_kref_release - Called to free the scsi_cd structure
885 * @kref: pointer to embedded kref
887 * sr_ref_mutex must be held entering this routine. Because it is
888 * called on last put, you should always use the scsi_cd_get()
889 * scsi_cd_put() helpers which manipulate the semaphore directly
890 * and never do a direct kref_put().
892 static void sr_kref_release(struct kref
*kref
)
894 struct scsi_cd
*cd
= container_of(kref
, struct scsi_cd
, kref
);
895 struct gendisk
*disk
= cd
->disk
;
897 spin_lock(&sr_index_lock
);
898 clear_bit(MINOR(disk_devt(disk
)), sr_index_bits
);
899 spin_unlock(&sr_index_lock
);
901 unregister_cdrom(&cd
->cdi
);
903 disk
->private_data
= NULL
;
910 static int sr_remove(struct device
*dev
)
912 struct scsi_cd
*cd
= dev_get_drvdata(dev
);
914 blk_queue_prep_rq(cd
->device
->request_queue
, scsi_prep_fn
);
915 del_gendisk(cd
->disk
);
917 mutex_lock(&sr_ref_mutex
);
918 kref_put(&cd
->kref
, sr_kref_release
);
919 mutex_unlock(&sr_ref_mutex
);
924 static int __init
init_sr(void)
928 rc
= register_blkdev(SCSI_CDROM_MAJOR
, "sr");
931 rc
= scsi_register_driver(&sr_template
.gendrv
);
933 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
938 static void __exit
exit_sr(void)
940 scsi_unregister_driver(&sr_template
.gendrv
);
941 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
944 module_init(init_sr
);
945 module_exit(exit_sr
);
946 MODULE_LICENSE("GPL");