1 // SPDX-License-Identifier: GPL-2.0-only
3 * sr.c Copyright (C) 1992 David Giller
4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
7 * sd.c Copyright (C) 1992 Drew Eckhardt
8 * Linux scsi disk driver by
9 * Drew Eckhardt <drew@colorado.edu>
11 * Modified by Eric Youngdale ericy@andante.org to
12 * add scatter-gather, multiple outstanding request, and other
15 * Modified by Eric Youngdale eric@andante.org to support loadable
16 * low-level scsi drivers.
18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
22 * generic cdrom interface
24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
25 * interface, capabilities probe additions, ioctl cleanups, etc.
27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
30 * transparently and lose the GHOST hack
32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
33 * check resource allocation in sr_init and some cleanups
36 #include <linux/module.h>
38 #include <linux/kernel.h>
40 #include <linux/bio.h>
41 #include <linux/compat.h>
42 #include <linux/string.h>
43 #include <linux/errno.h>
44 #include <linux/cdrom.h>
45 #include <linux/interrupt.h>
46 #include <linux/init.h>
47 #include <linux/blkdev.h>
48 #include <linux/blk-pm.h>
49 #include <linux/mutex.h>
50 #include <linux/slab.h>
51 #include <linux/pm_runtime.h>
52 #include <linux/uaccess.h>
54 #include <asm/unaligned.h>
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_device.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
65 #include "scsi_logging.h"
69 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
70 MODULE_LICENSE("GPL");
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
72 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
73 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
77 #define SR_CAPABILITIES \
78 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
79 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
80 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
81 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
82 CDC_MRW|CDC_MRW_W|CDC_RAM)
84 static int sr_probe(struct device *);
85 static int sr_remove(struct device *);
86 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
87 static int sr_done(struct scsi_cmnd *);
88 static int sr_runtime_suspend(struct device *dev);
90 static const struct dev_pm_ops sr_pm_ops = {
91 .runtime_suspend = sr_runtime_suspend,
94 static struct scsi_driver sr_template = {
102 .init_command = sr_init_command,
106 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
107 static DEFINE_SPINLOCK(sr_index_lock);
109 /* This semaphore is used to mediate the 0->1 reference get in the
110 * face of object destruction (i.e. we can't allow a get on an
111 * object after last put) */
112 static DEFINE_MUTEX(sr_ref_mutex);
114 static int sr_open(struct cdrom_device_info *, int);
115 static void sr_release(struct cdrom_device_info *);
117 static void get_sectorsize(struct scsi_cd *);
118 static void get_capabilities(struct scsi_cd *);
120 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
121 unsigned int clearing, int slot);
122 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
124 static const struct cdrom_device_ops sr_dops = {
126 .release = sr_release,
127 .drive_status = sr_drive_status,
128 .check_events = sr_check_events,
129 .tray_move = sr_tray_move,
130 .lock_door = sr_lock_door,
131 .select_speed = sr_select_speed,
132 .get_last_session = sr_get_last_session,
133 .get_mcn = sr_get_mcn,
135 .audio_ioctl = sr_audio_ioctl,
136 .capability = SR_CAPABILITIES,
137 .generic_packet = sr_packet,
140 static void sr_kref_release(struct kref *kref);
142 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
144 return container_of(disk->private_data, struct scsi_cd, driver);
147 static int sr_runtime_suspend(struct device *dev)
149 struct scsi_cd *cd = dev_get_drvdata(dev);
151 if (!cd) /* E.g.: runtime suspend following sr_remove() */
154 if (cd->media_present)
161 * The get and put routines for the struct scsi_cd. Note this entity
162 * has a scsi_device pointer and owns a reference to this.
164 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
166 struct scsi_cd *cd = NULL;
168 mutex_lock(&sr_ref_mutex);
169 if (disk->private_data == NULL)
173 if (scsi_device_get(cd->device)) {
174 kref_put(&cd->kref, sr_kref_release);
178 mutex_unlock(&sr_ref_mutex);
182 static void scsi_cd_put(struct scsi_cd *cd)
184 struct scsi_device *sdev = cd->device;
186 mutex_lock(&sr_ref_mutex);
187 kref_put(&cd->kref, sr_kref_release);
188 scsi_device_put(sdev);
189 mutex_unlock(&sr_ref_mutex);
192 static unsigned int sr_get_events(struct scsi_device *sdev)
195 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
198 1 << 4, /* notification class: media */
200 0, sizeof(buf), /* allocation length */
203 struct event_header *eh = (void *)buf;
204 struct media_event_desc *med = (void *)(buf + 4);
205 struct scsi_sense_hdr sshdr;
208 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
209 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
210 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
211 return DISK_EVENT_MEDIA_CHANGE;
213 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
216 if (eh->nea || eh->notification_class != 0x4)
219 if (med->media_event_code == 1)
220 return DISK_EVENT_EJECT_REQUEST;
221 else if (med->media_event_code == 2)
222 return DISK_EVENT_MEDIA_CHANGE;
223 else if (med->media_event_code == 3)
224 return DISK_EVENT_EJECT_REQUEST;
229 * This function checks to see if the media has been changed or eject
230 * button has been pressed. It is possible that we have already
231 * sensed a change, or the drive may have sensed one and not yet
232 * reported it. The past events are accumulated in sdev->changed and
233 * returned together with the current state.
235 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
236 unsigned int clearing, int slot)
238 struct scsi_cd *cd = cdi->handle;
240 struct scsi_sense_hdr sshdr;
244 /* no changer support */
245 if (CDSL_CURRENT != slot)
248 events = sr_get_events(cd->device);
249 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
252 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
253 * for several times in a row. We rely on TUR only for this likely
254 * broken device, to prevent generating incorrect media changed
255 * events for every open().
257 if (cd->ignore_get_event) {
258 events &= ~DISK_EVENT_MEDIA_CHANGE;
263 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
264 * is being cleared. Note that there are devices which hang
265 * if asked to execute TUR repeatedly.
267 if (cd->device->changed) {
268 events |= DISK_EVENT_MEDIA_CHANGE;
269 cd->device->changed = 0;
270 cd->tur_changed = true;
273 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
276 /* let's see whether the media is there with TUR */
277 last_present = cd->media_present;
278 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
281 * Media is considered to be present if TUR succeeds or fails with
282 * sense data indicating something other than media-not-present
285 cd->media_present = scsi_status_is_good(ret) ||
286 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
288 if (last_present != cd->media_present)
289 cd->device->changed = 1;
291 if (cd->device->changed) {
292 events |= DISK_EVENT_MEDIA_CHANGE;
293 cd->device->changed = 0;
294 cd->tur_changed = true;
297 if (cd->ignore_get_event)
300 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
301 if (!cd->tur_changed) {
302 if (cd->get_event_changed) {
303 if (cd->tur_mismatch++ > 8) {
304 sr_printk(KERN_WARNING, cd,
305 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
306 cd->ignore_get_event = true;
309 cd->tur_mismatch = 0;
312 cd->tur_changed = false;
313 cd->get_event_changed = false;
319 * sr_done is the interrupt routine for the device driver.
321 * It will be notified on the end of a SCSI read / write, and will take one
322 * of several actions based on success or failure.
324 static int sr_done(struct scsi_cmnd *SCpnt)
326 int result = SCpnt->result;
327 int this_count = scsi_bufflen(SCpnt);
328 int good_bytes = (result == 0 ? this_count : 0);
329 int block_sectors = 0;
331 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
334 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
338 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
339 * success. Since this is a relatively rare error condition, no
340 * care is taken to avoid unnecessary additional work such as
341 * memcpy's that could be avoided.
343 if (scsi_status_is_check_condition(result) &&
344 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
345 switch (SCpnt->sense_buffer[2]) {
347 case VOLUME_OVERFLOW:
348 case ILLEGAL_REQUEST:
349 if (!(SCpnt->sense_buffer[0] & 0x90))
352 get_unaligned_be32(&SCpnt->sense_buffer[3]);
353 if (SCpnt->request->bio != NULL)
355 bio_sectors(SCpnt->request->bio);
356 if (block_sectors < 4)
358 if (cd->device->sector_size == 2048)
360 error_sector &= ~(block_sectors - 1);
361 good_bytes = (error_sector -
362 blk_rq_pos(SCpnt->request)) << 9;
363 if (good_bytes < 0 || good_bytes >= this_count)
366 * The SCSI specification allows for the value
367 * returned by READ CAPACITY to be up to 75 2K
368 * sectors past the last readable block.
369 * Therefore, if we hit a medium error within the
370 * last 75 2K sectors, we decrease the saved size
373 if (error_sector < get_capacity(cd->disk) &&
374 cd->capacity - error_sector < 4 * 75)
375 set_capacity(cd->disk, error_sector);
378 case RECOVERED_ERROR:
379 good_bytes = this_count;
390 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
392 int block = 0, this_count, s_size;
394 struct request *rq = SCpnt->request;
397 ret = scsi_alloc_sgtables(SCpnt);
398 if (ret != BLK_STS_OK)
400 cd = scsi_cd(rq->rq_disk);
402 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
403 "Doing sr request, block = %d\n", block));
405 if (!cd->device || !scsi_device_online(cd->device)) {
406 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
407 "Finishing %u sectors\n", blk_rq_sectors(rq)));
408 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
409 "Retry with 0x%p\n", SCpnt));
413 if (cd->device->changed) {
415 * quietly refuse to do anything to a changed disc until the
416 * changed bit has been reset
421 s_size = cd->device->sector_size;
422 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
423 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
427 switch (req_op(rq)) {
431 SCpnt->cmnd[0] = WRITE_10;
432 cd->cdi.media_written = 1;
435 SCpnt->cmnd[0] = READ_10;
438 blk_dump_rq_flags(rq, "Unknown sr command");
443 struct scatterlist *sg;
444 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
446 scsi_for_each_sg(SCpnt, sg, sg_count, i)
449 if (size != scsi_bufflen(SCpnt)) {
450 scmd_printk(KERN_ERR, SCpnt,
451 "mismatch count %d, bytes %d\n",
452 size, scsi_bufflen(SCpnt));
453 if (scsi_bufflen(SCpnt) > size)
454 SCpnt->sdb.length = size;
459 * request doesn't start on hw block boundary, add scatter pads
461 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
462 (scsi_bufflen(SCpnt) % s_size)) {
463 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
467 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
470 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
471 "%s %d/%u 512 byte blocks.\n",
472 (rq_data_dir(rq) == WRITE) ?
473 "writing" : "reading",
474 this_count, blk_rq_sectors(rq)));
477 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
479 if (this_count > 0xffff) {
481 SCpnt->sdb.length = this_count * s_size;
484 put_unaligned_be32(block, &SCpnt->cmnd[2]);
485 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
486 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
489 * We shouldn't disconnect in the middle of a sector, so with a dumb
490 * host adapter, it's safe to assume that we can at least transfer
491 * this many bytes between each connect / disconnect.
493 SCpnt->transfersize = cd->device->sector_size;
494 SCpnt->underflow = this_count << 9;
495 SCpnt->allowed = MAX_RETRIES;
499 * This indicates that the command is ready from our end to be queued.
503 scsi_free_sgtables(SCpnt);
504 return BLK_STS_IOERR;
507 static void sr_revalidate_disk(struct scsi_cd *cd)
509 struct scsi_sense_hdr sshdr;
511 /* if the unit is not ready, nothing more to do */
512 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
514 sr_cd_check(&cd->cdi);
518 static int sr_block_open(struct block_device *bdev, fmode_t mode)
521 struct scsi_device *sdev;
524 cd = scsi_cd_get(bdev->bd_disk);
529 scsi_autopm_get_device(sdev);
530 if (bdev_check_media_change(bdev))
531 sr_revalidate_disk(cd);
533 mutex_lock(&cd->lock);
534 ret = cdrom_open(&cd->cdi, bdev, mode);
535 mutex_unlock(&cd->lock);
537 scsi_autopm_put_device(sdev);
545 static void sr_block_release(struct gendisk *disk, fmode_t mode)
547 struct scsi_cd *cd = scsi_cd(disk);
549 mutex_lock(&cd->lock);
550 cdrom_release(&cd->cdi, mode);
551 mutex_unlock(&cd->lock);
556 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
559 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
560 struct scsi_device *sdev = cd->device;
561 void __user *argp = (void __user *)arg;
564 mutex_lock(&cd->lock);
566 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
567 (mode & FMODE_NDELAY) != 0);
571 scsi_autopm_get_device(sdev);
574 * Send SCSI addressing ioctls directly to mid level, send other
575 * ioctls to cdrom/block level.
578 case SCSI_IOCTL_GET_IDLUN:
579 case SCSI_IOCTL_GET_BUS_NUMBER:
580 ret = scsi_ioctl(sdev, cmd, argp);
584 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
588 ret = scsi_ioctl(sdev, cmd, argp);
591 scsi_autopm_put_device(sdev);
594 mutex_unlock(&cd->lock);
599 static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
602 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
603 struct scsi_device *sdev = cd->device;
604 void __user *argp = compat_ptr(arg);
607 mutex_lock(&cd->lock);
609 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
610 (mode & FMODE_NDELAY) != 0);
614 scsi_autopm_get_device(sdev);
617 * Send SCSI addressing ioctls directly to mid level, send other
618 * ioctls to cdrom/block level.
621 case SCSI_IOCTL_GET_IDLUN:
622 case SCSI_IOCTL_GET_BUS_NUMBER:
623 ret = scsi_compat_ioctl(sdev, cmd, argp);
627 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp);
631 ret = scsi_compat_ioctl(sdev, cmd, argp);
634 scsi_autopm_put_device(sdev);
637 mutex_unlock(&cd->lock);
643 static unsigned int sr_block_check_events(struct gendisk *disk,
644 unsigned int clearing)
646 unsigned int ret = 0;
649 cd = scsi_cd_get(disk);
653 if (!atomic_read(&cd->device->disk_events_disable_depth))
654 ret = cdrom_check_events(&cd->cdi, clearing);
660 static const struct block_device_operations sr_bdops =
662 .owner = THIS_MODULE,
663 .open = sr_block_open,
664 .release = sr_block_release,
665 .ioctl = sr_block_ioctl,
667 .compat_ioctl = sr_block_compat_ioctl,
669 .check_events = sr_block_check_events,
672 static int sr_open(struct cdrom_device_info *cdi, int purpose)
674 struct scsi_cd *cd = cdi->handle;
675 struct scsi_device *sdev = cd->device;
679 * If the device is in error recovery, wait until it is done.
680 * If the device is offline, then disallow any access to it.
683 if (!scsi_block_when_processing_errors(sdev))
692 static void sr_release(struct cdrom_device_info *cdi)
696 static int sr_probe(struct device *dev)
698 struct scsi_device *sdev = to_scsi_device(dev);
699 struct gendisk *disk;
703 scsi_autopm_get_device(sdev);
705 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
709 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
713 kref_init(&cd->kref);
715 disk = alloc_disk(1);
718 mutex_init(&cd->lock);
720 spin_lock(&sr_index_lock);
721 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
722 if (minor == SR_DISKS) {
723 spin_unlock(&sr_index_lock);
727 __set_bit(minor, sr_index_bits);
728 spin_unlock(&sr_index_lock);
730 disk->major = SCSI_CDROM_MAJOR;
731 disk->first_minor = minor;
732 sprintf(disk->disk_name, "sr%d", minor);
733 disk->fops = &sr_bdops;
734 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
735 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
736 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
738 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
742 cd->driver = &sr_template;
744 cd->capacity = 0x1fffff;
745 cd->device->changed = 1; /* force recheck CD type */
746 cd->media_present = 1;
748 cd->readcd_known = 0;
751 cd->cdi.ops = &sr_dops;
754 cd->cdi.capacity = 1;
755 sprintf(cd->cdi.name, "sr%d", minor);
757 sdev->sector_size = 2048; /* A guess, just in case */
759 /* FIXME: need to handle a get_capabilities failure properly ?? */
760 get_capabilities(cd);
763 set_capacity(disk, cd->capacity);
764 disk->private_data = &cd->driver;
765 disk->queue = sdev->request_queue;
767 if (register_cdrom(disk, &cd->cdi))
771 * Initialize block layer runtime PM stuffs before the
772 * periodic event checking request gets started in add_disk.
774 blk_pm_runtime_init(sdev->request_queue, dev);
776 dev_set_drvdata(dev, cd);
777 disk->flags |= GENHD_FL_REMOVABLE;
778 sr_revalidate_disk(cd);
779 device_add_disk(&sdev->sdev_gendev, disk, NULL);
781 sdev_printk(KERN_DEBUG, sdev,
782 "Attached scsi CD-ROM %s\n", cd->cdi.name);
783 scsi_autopm_put_device(cd->device);
788 spin_lock(&sr_index_lock);
789 clear_bit(minor, sr_index_bits);
790 spin_unlock(&sr_index_lock);
793 mutex_destroy(&cd->lock);
797 scsi_autopm_put_device(sdev);
802 static void get_sectorsize(struct scsi_cd *cd)
804 unsigned char cmd[10];
805 unsigned char buffer[8];
806 int the_result, retries = 3;
808 struct request_queue *queue;
811 cmd[0] = READ_CAPACITY;
812 memset((void *) &cmd[1], 0, 9);
813 memset(buffer, 0, sizeof(buffer));
815 /* Do the command and wait.. */
816 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
817 buffer, sizeof(buffer), NULL,
818 SR_TIMEOUT, MAX_RETRIES, NULL);
822 } while (the_result && retries);
826 cd->capacity = 0x1fffff;
827 sector_size = 2048; /* A guess, just in case */
831 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
833 * READ_CAPACITY doesn't return the correct size on
834 * certain UDF media. If last_written is larger, use
837 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
839 if (!cdrom_get_last_written(&cd->cdi, &last_written))
840 cd->capacity = max_t(long, cd->capacity, last_written);
842 sector_size = get_unaligned_be32(&buffer[4]);
843 switch (sector_size) {
845 * HP 4020i CD-Recorder reports 2340 byte sectors
846 * Philips CD-Writers report 2352 byte sectors
848 * Use 2k sectors for them..
861 sr_printk(KERN_INFO, cd,
862 "unsupported sector size %d.", sector_size);
866 cd->device->sector_size = sector_size;
869 * Add this so that we have the ability to correctly gauge
870 * what the device is capable of.
872 set_capacity(cd->disk, cd->capacity);
875 queue = cd->device->request_queue;
876 blk_queue_logical_block_size(queue, sector_size);
881 static void get_capabilities(struct scsi_cd *cd)
883 unsigned char *buffer;
884 struct scsi_mode_data data;
885 struct scsi_sense_hdr sshdr;
886 unsigned int ms_len = 128;
889 static const char *loadmech[] =
902 /* allocate transfer buffer */
903 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
905 sr_printk(KERN_ERR, cd, "out of memory.\n");
909 /* eat unit attentions */
910 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
912 /* ask for mode page 0x2a */
913 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
914 SR_TIMEOUT, 3, &data, NULL);
916 if (rc < 0 || data.length > ms_len ||
917 data.header_length + data.block_descriptor_length > data.length) {
918 /* failed, drive doesn't have capabilities mode page */
920 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
921 CDC_DVD | CDC_DVD_RAM |
922 CDC_SELECT_DISC | CDC_SELECT_SPEED |
923 CDC_MRW | CDC_MRW_W | CDC_RAM);
925 sr_printk(KERN_INFO, cd, "scsi-1 drive");
929 n = data.header_length + data.block_descriptor_length;
930 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
931 cd->readcd_known = 1;
932 cd->readcd_cdda = buffer[n + 5] & 0x01;
933 /* print some capability bits */
934 sr_printk(KERN_INFO, cd,
935 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
936 get_unaligned_be16(&buffer[n + 14]) / 176,
938 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
939 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
940 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
941 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
942 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
943 loadmech[buffer[n + 6] >> 5]);
944 if ((buffer[n + 6] >> 5) == 0)
945 /* caddy drives can't close tray... */
946 cd->cdi.mask |= CDC_CLOSE_TRAY;
947 if ((buffer[n + 2] & 0x8) == 0)
948 /* not a DVD drive */
949 cd->cdi.mask |= CDC_DVD;
950 if ((buffer[n + 3] & 0x20) == 0)
951 /* can't write DVD-RAM media */
952 cd->cdi.mask |= CDC_DVD_RAM;
953 if ((buffer[n + 3] & 0x10) == 0)
954 /* can't write DVD-R media */
955 cd->cdi.mask |= CDC_DVD_R;
956 if ((buffer[n + 3] & 0x2) == 0)
957 /* can't write CD-RW media */
958 cd->cdi.mask |= CDC_CD_RW;
959 if ((buffer[n + 3] & 0x1) == 0)
960 /* can't write CD-R media */
961 cd->cdi.mask |= CDC_CD_R;
962 if ((buffer[n + 6] & 0x8) == 0)
964 cd->cdi.mask |= CDC_OPEN_TRAY;
966 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
967 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
969 cdrom_number_of_slots(&cd->cdi);
970 if (cd->cdi.capacity <= 1)
972 cd->cdi.mask |= CDC_SELECT_DISC;
973 /*else I don't think it can close its tray
974 cd->cdi.mask |= CDC_CLOSE_TRAY; */
977 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
979 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
980 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
988 * sr_packet() is the entry point for the generic commands generated
989 * by the Uniform CD-ROM layer.
991 static int sr_packet(struct cdrom_device_info *cdi,
992 struct packet_command *cgc)
994 struct scsi_cd *cd = cdi->handle;
995 struct scsi_device *sdev = cd->device;
997 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
998 return -EDRIVE_CANT_DO_THIS;
1000 if (cgc->timeout <= 0)
1001 cgc->timeout = IOCTL_TIMEOUT;
1003 sr_do_ioctl(cd, cgc);
1009 * sr_kref_release - Called to free the scsi_cd structure
1010 * @kref: pointer to embedded kref
1012 * sr_ref_mutex must be held entering this routine. Because it is
1013 * called on last put, you should always use the scsi_cd_get()
1014 * scsi_cd_put() helpers which manipulate the semaphore directly
1015 * and never do a direct kref_put().
1017 static void sr_kref_release(struct kref *kref)
1019 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
1020 struct gendisk *disk = cd->disk;
1022 spin_lock(&sr_index_lock);
1023 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
1024 spin_unlock(&sr_index_lock);
1026 unregister_cdrom(&cd->cdi);
1028 disk->private_data = NULL;
1032 mutex_destroy(&cd->lock);
1037 static int sr_remove(struct device *dev)
1039 struct scsi_cd *cd = dev_get_drvdata(dev);
1041 scsi_autopm_get_device(cd->device);
1043 del_gendisk(cd->disk);
1044 dev_set_drvdata(dev, NULL);
1046 mutex_lock(&sr_ref_mutex);
1047 kref_put(&cd->kref, sr_kref_release);
1048 mutex_unlock(&sr_ref_mutex);
1053 static int __init init_sr(void)
1057 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1060 rc = scsi_register_driver(&sr_template.gendrv);
1062 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1067 static void __exit exit_sr(void)
1069 scsi_unregister_driver(&sr_template.gendrv);
1070 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1073 module_init(init_sr);
1074 module_exit(exit_sr);
1075 MODULE_LICENSE("GPL");