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>
38 #include <linux/sched.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>
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"
66 #define SR_TIMEOUT (30 * HZ)
67 #define SR_CAPABILITIES \
68 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
69 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
70 CDC_PLAY_AUDIO|CDC_RESET|CDC_IOCTLS|CDC_DRIVE_STATUS| \
71 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
72 CDC_MRW|CDC_MRW_W|CDC_RAM)
74 static int sr_probe(struct device
*);
75 static int sr_remove(struct device
*);
76 static int sr_init_command(struct scsi_cmnd
*);
78 static struct scsi_driver sr_template
= {
85 .init_command
= sr_init_command
,
88 static unsigned long sr_index_bits
[SR_DISKS
/ BITS_PER_LONG
];
89 static DEFINE_SPINLOCK(sr_index_lock
);
91 /* This semaphore is used to mediate the 0->1 reference get in the
92 * face of object destruction (i.e. we can't allow a get on an
93 * object after last put) */
94 static DEFINE_MUTEX(sr_ref_mutex
);
96 static int sr_open(struct cdrom_device_info
*, int);
97 static void sr_release(struct cdrom_device_info
*);
99 static void get_sectorsize(struct scsi_cd
*);
100 static void get_capabilities(struct scsi_cd
*);
102 static int sr_media_change(struct cdrom_device_info
*, int);
103 static int sr_packet(struct cdrom_device_info
*, struct packet_command
*);
105 static struct cdrom_device_ops sr_dops
= {
107 .release
= sr_release
,
108 .drive_status
= sr_drive_status
,
109 .media_changed
= sr_media_change
,
110 .tray_move
= sr_tray_move
,
111 .lock_door
= sr_lock_door
,
112 .select_speed
= sr_select_speed
,
113 .get_last_session
= sr_get_last_session
,
114 .get_mcn
= sr_get_mcn
,
116 .audio_ioctl
= sr_audio_ioctl
,
117 .dev_ioctl
= sr_dev_ioctl
,
118 .capability
= SR_CAPABILITIES
,
119 .generic_packet
= sr_packet
,
122 static void sr_kref_release(struct kref
*kref
);
124 static inline struct scsi_cd
*scsi_cd(struct gendisk
*disk
)
126 return container_of(disk
->private_data
, struct scsi_cd
, driver
);
130 * The get and put routines for the struct scsi_cd. Note this entity
131 * has a scsi_device pointer and owns a reference to this.
133 static inline struct scsi_cd
*scsi_cd_get(struct gendisk
*disk
)
135 struct scsi_cd
*cd
= NULL
;
137 mutex_lock(&sr_ref_mutex
);
138 if (disk
->private_data
== NULL
)
142 if (scsi_device_get(cd
->device
))
147 kref_put(&cd
->kref
, sr_kref_release
);
150 mutex_unlock(&sr_ref_mutex
);
154 static inline void scsi_cd_put(struct scsi_cd
*cd
)
156 struct scsi_device
*sdev
= cd
->device
;
158 mutex_lock(&sr_ref_mutex
);
159 kref_put(&cd
->kref
, sr_kref_release
);
160 scsi_device_put(sdev
);
161 mutex_unlock(&sr_ref_mutex
);
165 * This function checks to see if the media has been changed in the
166 * CDROM drive. It is possible that we have already sensed a change,
167 * or the drive may have sensed one and not yet reported it. We must
168 * be ready for either case. This function always reports the current
169 * value of the changed bit. If flag is 0, then the changed bit is reset.
170 * This function could be done as an ioctl, but we would need to have
171 * an inode for that to work, and we do not always have one.
174 int sr_media_change(struct cdrom_device_info
*cdi
, int slot
)
176 struct scsi_cd
*cd
= cdi
->handle
;
179 if (CDSL_CURRENT
!= slot
) {
180 /* no changer support */
184 retval
= scsi_test_unit_ready(cd
->device
, SR_TIMEOUT
, MAX_RETRIES
);
186 /* Unable to test, unit probably not ready. This usually
187 * means there is no disc in the drive. Mark as changed,
188 * and we will figure it out later once the drive is
189 * available again. */
190 cd
->device
->changed
= 1;
191 return 1; /* This will force a flush, if called from
192 * check_disk_change */
195 retval
= cd
->device
->changed
;
196 cd
->device
->changed
= 0;
197 /* If the disk changed, the capacity will now be different,
198 * so we force a re-read of this information */
200 /* check multisession offset etc */
209 * rw_intr is the interrupt routine for the device driver.
211 * It will be notified on the end of a SCSI read / write, and will take on
212 * of several actions based on success or failure.
214 static void rw_intr(struct scsi_cmnd
* SCpnt
)
216 int result
= SCpnt
->result
;
217 int this_count
= SCpnt
->bufflen
;
218 int good_bytes
= (result
== 0 ? this_count
: 0);
219 int block_sectors
= 0;
221 struct scsi_cd
*cd
= scsi_cd(SCpnt
->request
->rq_disk
);
224 printk("sr.c done: %x\n", result
);
228 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
229 * success. Since this is a relatively rare error condition, no
230 * care is taken to avoid unnecessary additional work such as
231 * memcpy's that could be avoided.
233 if (driver_byte(result
) != 0 && /* An error occurred */
234 (SCpnt
->sense_buffer
[0] & 0x7f) == 0x70) { /* Sense current */
235 switch (SCpnt
->sense_buffer
[2]) {
237 case VOLUME_OVERFLOW
:
238 case ILLEGAL_REQUEST
:
239 if (!(SCpnt
->sense_buffer
[0] & 0x90))
241 if (!blk_fs_request(SCpnt
->request
))
243 error_sector
= (SCpnt
->sense_buffer
[3] << 24) |
244 (SCpnt
->sense_buffer
[4] << 16) |
245 (SCpnt
->sense_buffer
[5] << 8) |
246 SCpnt
->sense_buffer
[6];
247 if (SCpnt
->request
->bio
!= NULL
)
249 bio_sectors(SCpnt
->request
->bio
);
250 if (block_sectors
< 4)
252 if (cd
->device
->sector_size
== 2048)
254 error_sector
&= ~(block_sectors
- 1);
255 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
256 if (good_bytes
< 0 || good_bytes
>= this_count
)
259 * The SCSI specification allows for the value
260 * returned by READ CAPACITY to be up to 75 2K
261 * sectors past the last readable block.
262 * Therefore, if we hit a medium error within the
263 * last 75 2K sectors, we decrease the saved size
266 if (error_sector
< get_capacity(cd
->disk
) &&
267 cd
->capacity
- error_sector
< 4 * 75)
268 set_capacity(cd
->disk
, error_sector
);
271 case RECOVERED_ERROR
:
274 * An error occured, but it recovered. Inform the
275 * user, but make sure that it's not treated as a
278 scsi_print_sense("sr", SCpnt
);
280 SCpnt
->sense_buffer
[0] = 0x0;
281 good_bytes
= this_count
;
290 * This calls the generic completion function, now that we know
291 * how many actual sectors finished, and how many sectors we need
292 * to say have failed.
294 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
297 static int sr_init_command(struct scsi_cmnd
* SCpnt
)
299 int block
=0, this_count
, s_size
, timeout
= SR_TIMEOUT
;
300 struct scsi_cd
*cd
= scsi_cd(SCpnt
->request
->rq_disk
);
302 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
303 cd
->disk
->disk_name
, block
));
305 if (!cd
->device
|| !scsi_device_online(cd
->device
)) {
306 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
307 SCpnt
->request
->nr_sectors
));
308 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
312 if (cd
->device
->changed
) {
314 * quietly refuse to do anything to a changed disc until the
315 * changed bit has been reset
321 * these are already setup, just copy cdb basically
323 if (SCpnt
->request
->flags
& REQ_BLOCK_PC
) {
324 scsi_setup_blk_pc_cmnd(SCpnt
);
326 if (SCpnt
->timeout_per_command
)
327 timeout
= SCpnt
->timeout_per_command
;
332 if (!(SCpnt
->request
->flags
& REQ_CMD
)) {
333 blk_dump_rq_flags(SCpnt
->request
, "sr unsup command");
338 * we do lazy blocksize switching (when reading XA sectors,
339 * see CDROMREADMODE2 ioctl)
341 s_size
= cd
->device
->sector_size
;
344 sr_set_blocklength(cd
, 2048);
346 printk("sr: can't switch blocksize: in interrupt\n");
349 if (s_size
!= 512 && s_size
!= 1024 && s_size
!= 2048) {
350 scmd_printk(KERN_ERR
, SCpnt
, "bad sector size %d\n", s_size
);
354 if (rq_data_dir(SCpnt
->request
) == WRITE
) {
355 if (!cd
->device
->writeable
)
357 SCpnt
->cmnd
[0] = WRITE_10
;
358 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
359 cd
->cdi
.media_written
= 1;
360 } else if (rq_data_dir(SCpnt
->request
) == READ
) {
361 SCpnt
->cmnd
[0] = READ_10
;
362 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
364 blk_dump_rq_flags(SCpnt
->request
, "Unknown sr command");
369 struct scatterlist
*sg
= SCpnt
->request_buffer
;
371 for (i
= 0; i
< SCpnt
->use_sg
; i
++)
372 size
+= sg
[i
].length
;
374 if (size
!= SCpnt
->request_bufflen
&& SCpnt
->use_sg
) {
375 scmd_printk(KERN_ERR
, SCpnt
,
376 "mismatch count %d, bytes %d\n",
377 size
, SCpnt
->request_bufflen
);
378 if (SCpnt
->request_bufflen
> size
)
379 SCpnt
->request_bufflen
= SCpnt
->bufflen
= size
;
384 * request doesn't start on hw block boundary, add scatter pads
386 if (((unsigned int)SCpnt
->request
->sector
% (s_size
>> 9)) ||
387 (SCpnt
->request_bufflen
% s_size
)) {
388 scmd_printk(KERN_NOTICE
, SCpnt
, "unaligned transfer\n");
392 this_count
= (SCpnt
->request_bufflen
>> 9) / (s_size
>> 9);
395 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
397 (rq_data_dir(SCpnt
->request
) == WRITE
) ?
398 "writing" : "reading",
399 this_count
, SCpnt
->request
->nr_sectors
));
402 block
= (unsigned int)SCpnt
->request
->sector
/ (s_size
>> 9);
404 if (this_count
> 0xffff) {
406 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
410 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
411 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
412 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
413 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
414 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
415 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
416 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
419 * We shouldn't disconnect in the middle of a sector, so with a dumb
420 * host adapter, it's safe to assume that we can at least transfer
421 * this many bytes between each connect / disconnect.
423 SCpnt
->transfersize
= cd
->device
->sector_size
;
424 SCpnt
->underflow
= this_count
<< 9;
427 SCpnt
->allowed
= MAX_RETRIES
;
428 SCpnt
->timeout_per_command
= timeout
;
431 * This is the completion routine we use. This is matched in terms
432 * of capability to this function.
434 SCpnt
->done
= rw_intr
;
437 * This indicates that the command is ready from our end to be
443 static int sr_block_open(struct inode
*inode
, struct file
*file
)
445 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
449 if(!(cd
= scsi_cd_get(disk
)))
452 if((ret
= cdrom_open(&cd
->cdi
, inode
, file
)) != 0)
458 static int sr_block_release(struct inode
*inode
, struct file
*file
)
461 struct scsi_cd
*cd
= scsi_cd(inode
->i_bdev
->bd_disk
);
462 ret
= cdrom_release(&cd
->cdi
, file
);
471 static int sr_block_ioctl(struct inode
*inode
, struct file
*file
, unsigned cmd
,
474 struct scsi_cd
*cd
= scsi_cd(inode
->i_bdev
->bd_disk
);
475 struct scsi_device
*sdev
= cd
->device
;
478 * Send SCSI addressing ioctls directly to mid level, send other
479 * ioctls to cdrom/block level.
482 case SCSI_IOCTL_GET_IDLUN
:
483 case SCSI_IOCTL_GET_BUS_NUMBER
:
484 return scsi_ioctl(sdev
, cmd
, (void __user
*)arg
);
486 return cdrom_ioctl(file
, &cd
->cdi
, inode
, cmd
, arg
);
489 static int sr_block_media_changed(struct gendisk
*disk
)
491 struct scsi_cd
*cd
= scsi_cd(disk
);
492 return cdrom_media_changed(&cd
->cdi
);
495 static struct block_device_operations sr_bdops
=
497 .owner
= THIS_MODULE
,
498 .open
= sr_block_open
,
499 .release
= sr_block_release
,
500 .ioctl
= sr_block_ioctl
,
501 .media_changed
= sr_block_media_changed
,
503 * No compat_ioctl for now because sr_block_ioctl never
504 * seems to pass arbitary ioctls down to host drivers.
508 static int sr_open(struct cdrom_device_info
*cdi
, int purpose
)
510 struct scsi_cd
*cd
= cdi
->handle
;
511 struct scsi_device
*sdev
= cd
->device
;
515 * If the device is in error recovery, wait until it is done.
516 * If the device is offline, then disallow any access to it.
519 if (!scsi_block_when_processing_errors(sdev
))
528 static void sr_release(struct cdrom_device_info
*cdi
)
530 struct scsi_cd
*cd
= cdi
->handle
;
532 if (cd
->device
->sector_size
> 2048)
533 sr_set_blocklength(cd
, 2048);
537 static int sr_probe(struct device
*dev
)
539 struct scsi_device
*sdev
= to_scsi_device(dev
);
540 struct gendisk
*disk
;
545 if (sdev
->type
!= TYPE_ROM
&& sdev
->type
!= TYPE_WORM
)
549 cd
= kmalloc(sizeof(*cd
), GFP_KERNEL
);
552 memset(cd
, 0, sizeof(*cd
));
554 kref_init(&cd
->kref
);
556 disk
= alloc_disk(1);
560 spin_lock(&sr_index_lock
);
561 minor
= find_first_zero_bit(sr_index_bits
, SR_DISKS
);
562 if (minor
== SR_DISKS
) {
563 spin_unlock(&sr_index_lock
);
567 __set_bit(minor
, sr_index_bits
);
568 spin_unlock(&sr_index_lock
);
570 disk
->major
= SCSI_CDROM_MAJOR
;
571 disk
->first_minor
= minor
;
572 sprintf(disk
->disk_name
, "sr%d", minor
);
573 disk
->fops
= &sr_bdops
;
574 disk
->flags
= GENHD_FL_CD
;
578 cd
->driver
= &sr_template
;
580 cd
->capacity
= 0x1fffff;
581 cd
->device
->changed
= 1; /* force recheck CD type */
583 cd
->readcd_known
= 0;
586 cd
->cdi
.ops
= &sr_dops
;
589 cd
->cdi
.capacity
= 1;
590 sprintf(cd
->cdi
.name
, "sr%d", minor
);
592 sdev
->sector_size
= 2048; /* A guess, just in case */
594 /* FIXME: need to handle a get_capabilities failure properly ?? */
595 get_capabilities(cd
);
598 snprintf(disk
->devfs_name
, sizeof(disk
->devfs_name
),
599 "%s/cd", sdev
->devfs_name
);
600 disk
->driverfs_dev
= &sdev
->sdev_gendev
;
601 set_capacity(disk
, cd
->capacity
);
602 disk
->private_data
= &cd
->driver
;
603 disk
->queue
= sdev
->request_queue
;
606 if (register_cdrom(&cd
->cdi
))
609 dev_set_drvdata(dev
, cd
);
610 disk
->flags
|= GENHD_FL_REMOVABLE
;
613 sdev_printk(KERN_DEBUG
, sdev
,
614 "Attached scsi CD-ROM %s\n", cd
->cdi
.name
);
626 static void get_sectorsize(struct scsi_cd
*cd
)
628 unsigned char cmd
[10];
629 unsigned char *buffer
;
630 int the_result
, retries
= 3;
632 request_queue_t
*queue
;
634 buffer
= kmalloc(512, GFP_KERNEL
| GFP_DMA
);
639 cmd
[0] = READ_CAPACITY
;
640 memset((void *) &cmd
[1], 0, 9);
641 memset(buffer
, 0, 8);
643 /* Do the command and wait.. */
644 the_result
= scsi_execute_req(cd
->device
, cmd
, DMA_FROM_DEVICE
,
645 buffer
, 8, NULL
, SR_TIMEOUT
,
650 } while (the_result
&& retries
);
654 cd
->capacity
= 0x1fffff;
655 sector_size
= 2048; /* A guess, just in case */
658 if (cdrom_get_last_written(&cd
->cdi
,
661 cd
->capacity
= 1 + ((buffer
[0] << 24) |
665 sector_size
= (buffer
[4] << 24) |
666 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
667 switch (sector_size
) {
669 * HP 4020i CD-Recorder reports 2340 byte sectors
670 * Philips CD-Writers report 2352 byte sectors
672 * Use 2k sectors for them..
685 printk("%s: unsupported sector size %d.\n",
686 cd
->cdi
.name
, sector_size
);
690 cd
->device
->sector_size
= sector_size
;
693 * Add this so that we have the ability to correctly gauge
694 * what the device is capable of.
696 set_capacity(cd
->disk
, cd
->capacity
);
699 queue
= cd
->device
->request_queue
;
700 blk_queue_hardsect_size(queue
, sector_size
);
706 cd
->capacity
= 0x1fffff;
707 cd
->device
->sector_size
= 2048; /* A guess, just in case */
711 static void get_capabilities(struct scsi_cd
*cd
)
713 unsigned char *buffer
;
714 struct scsi_mode_data data
;
715 unsigned char cmd
[MAX_COMMAND_SIZE
];
716 struct scsi_sense_hdr sshdr
;
717 unsigned int the_result
;
720 static const char *loadmech
[] =
733 /* allocate transfer buffer */
734 buffer
= kmalloc(512, GFP_KERNEL
| GFP_DMA
);
736 printk(KERN_ERR
"sr: out of memory.\n");
740 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
741 * conditions are gone, or a timeout happens
745 memset((void *)cmd
, 0, MAX_COMMAND_SIZE
);
746 cmd
[0] = TEST_UNIT_READY
;
748 the_result
= scsi_execute_req (cd
->device
, cmd
, DMA_NONE
, NULL
,
749 0, &sshdr
, SR_TIMEOUT
,
753 } while (retries
< 5 &&
754 (!scsi_status_is_good(the_result
) ||
755 (scsi_sense_valid(&sshdr
) &&
756 sshdr
.sense_key
== UNIT_ATTENTION
)));
758 /* ask for mode page 0x2a */
759 rc
= scsi_mode_sense(cd
->device
, 0, 0x2a, buffer
, 128,
760 SR_TIMEOUT
, 3, &data
, NULL
);
762 if (!scsi_status_is_good(rc
)) {
763 /* failed, drive doesn't have capabilities mode page */
765 cd
->cdi
.mask
|= (CDC_CD_R
| CDC_CD_RW
| CDC_DVD_R
|
766 CDC_DVD
| CDC_DVD_RAM
|
767 CDC_SELECT_DISC
| CDC_SELECT_SPEED
);
769 printk("%s: scsi-1 drive\n", cd
->cdi
.name
);
773 n
= data
.header_length
+ data
.block_descriptor_length
;
774 cd
->cdi
.speed
= ((buffer
[n
+ 8] << 8) + buffer
[n
+ 9]) / 176;
775 cd
->readcd_known
= 1;
776 cd
->readcd_cdda
= buffer
[n
+ 5] & 0x01;
777 /* print some capability bits */
778 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd
->cdi
.name
,
779 ((buffer
[n
+ 14] << 8) + buffer
[n
+ 15]) / 176,
781 buffer
[n
+ 3] & 0x01 ? "writer " : "", /* CD Writer */
782 buffer
[n
+ 3] & 0x20 ? "dvd-ram " : "",
783 buffer
[n
+ 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
784 buffer
[n
+ 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
785 buffer
[n
+ 5] & 0x01 ? "cdda " : "", /* can read audio data */
786 loadmech
[buffer
[n
+ 6] >> 5]);
787 if ((buffer
[n
+ 6] >> 5) == 0)
788 /* caddy drives can't close tray... */
789 cd
->cdi
.mask
|= CDC_CLOSE_TRAY
;
790 if ((buffer
[n
+ 2] & 0x8) == 0)
791 /* not a DVD drive */
792 cd
->cdi
.mask
|= CDC_DVD
;
793 if ((buffer
[n
+ 3] & 0x20) == 0)
794 /* can't write DVD-RAM media */
795 cd
->cdi
.mask
|= CDC_DVD_RAM
;
796 if ((buffer
[n
+ 3] & 0x10) == 0)
797 /* can't write DVD-R media */
798 cd
->cdi
.mask
|= CDC_DVD_R
;
799 if ((buffer
[n
+ 3] & 0x2) == 0)
800 /* can't write CD-RW media */
801 cd
->cdi
.mask
|= CDC_CD_RW
;
802 if ((buffer
[n
+ 3] & 0x1) == 0)
803 /* can't write CD-R media */
804 cd
->cdi
.mask
|= CDC_CD_R
;
805 if ((buffer
[n
+ 6] & 0x8) == 0)
807 cd
->cdi
.mask
|= CDC_OPEN_TRAY
;
809 if ((buffer
[n
+ 6] >> 5) == mechtype_individual_changer
||
810 (buffer
[n
+ 6] >> 5) == mechtype_cartridge_changer
)
812 cdrom_number_of_slots(&cd
->cdi
);
813 if (cd
->cdi
.capacity
<= 1)
815 cd
->cdi
.mask
|= CDC_SELECT_DISC
;
816 /*else I don't think it can close its tray
817 cd->cdi.mask |= CDC_CLOSE_TRAY; */
820 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
822 if ((cd
->cdi
.mask
& (CDC_DVD_RAM
| CDC_MRW_W
| CDC_RAM
| CDC_CD_RW
)) !=
823 (CDC_DVD_RAM
| CDC_MRW_W
| CDC_RAM
| CDC_CD_RW
)) {
824 cd
->device
->writeable
= 1;
831 * sr_packet() is the entry point for the generic commands generated
832 * by the Uniform CD-ROM layer.
834 static int sr_packet(struct cdrom_device_info
*cdi
,
835 struct packet_command
*cgc
)
837 if (cgc
->timeout
<= 0)
838 cgc
->timeout
= IOCTL_TIMEOUT
;
840 sr_do_ioctl(cdi
->handle
, cgc
);
846 * sr_kref_release - Called to free the scsi_cd structure
847 * @kref: pointer to embedded kref
849 * sr_ref_mutex must be held entering this routine. Because it is
850 * called on last put, you should always use the scsi_cd_get()
851 * scsi_cd_put() helpers which manipulate the semaphore directly
852 * and never do a direct kref_put().
854 static void sr_kref_release(struct kref
*kref
)
856 struct scsi_cd
*cd
= container_of(kref
, struct scsi_cd
, kref
);
857 struct gendisk
*disk
= cd
->disk
;
859 spin_lock(&sr_index_lock
);
860 clear_bit(disk
->first_minor
, sr_index_bits
);
861 spin_unlock(&sr_index_lock
);
863 unregister_cdrom(&cd
->cdi
);
865 disk
->private_data
= NULL
;
872 static int sr_remove(struct device
*dev
)
874 struct scsi_cd
*cd
= dev_get_drvdata(dev
);
876 del_gendisk(cd
->disk
);
878 mutex_lock(&sr_ref_mutex
);
879 kref_put(&cd
->kref
, sr_kref_release
);
880 mutex_unlock(&sr_ref_mutex
);
885 static int __init
init_sr(void)
889 rc
= register_blkdev(SCSI_CDROM_MAJOR
, "sr");
892 return scsi_register_driver(&sr_template
.gendrv
);
895 static void __exit
exit_sr(void)
897 scsi_unregister_driver(&sr_template
.gendrv
);
898 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
901 module_init(init_sr
);
902 module_exit(exit_sr
);
903 MODULE_LICENSE("GPL");