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 <linux/pm_runtime.h>
49 #include <linux/uaccess.h>
51 #include <scsi/scsi.h>
52 #include <scsi/scsi_dbg.h>
53 #include <scsi/scsi_device.h>
54 #include <scsi/scsi_driver.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_eh.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
60 #include "scsi_logging.h"
64 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
65 MODULE_LICENSE("GPL");
66 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
67 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
68 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
72 #define SR_CAPABILITIES \
73 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
74 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
75 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
76 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
77 CDC_MRW|CDC_MRW_W|CDC_RAM)
79 static DEFINE_MUTEX(sr_mutex);
80 static int sr_probe(struct device *);
81 static int sr_remove(struct device *);
82 static int sr_init_command(struct scsi_cmnd *SCpnt);
83 static int sr_done(struct scsi_cmnd *);
84 static int sr_runtime_suspend(struct device *dev);
86 static const struct dev_pm_ops sr_pm_ops = {
87 .runtime_suspend = sr_runtime_suspend,
90 static struct scsi_driver sr_template = {
98 .init_command = sr_init_command,
102 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
103 static DEFINE_SPINLOCK(sr_index_lock);
105 /* This semaphore is used to mediate the 0->1 reference get in the
106 * face of object destruction (i.e. we can't allow a get on an
107 * object after last put) */
108 static DEFINE_MUTEX(sr_ref_mutex);
110 static int sr_open(struct cdrom_device_info *, int);
111 static void sr_release(struct cdrom_device_info *);
113 static void get_sectorsize(struct scsi_cd *);
114 static void get_capabilities(struct scsi_cd *);
116 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
117 unsigned int clearing, int slot);
118 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
120 static const struct cdrom_device_ops sr_dops = {
122 .release = sr_release,
123 .drive_status = sr_drive_status,
124 .check_events = sr_check_events,
125 .tray_move = sr_tray_move,
126 .lock_door = sr_lock_door,
127 .select_speed = sr_select_speed,
128 .get_last_session = sr_get_last_session,
129 .get_mcn = sr_get_mcn,
131 .audio_ioctl = sr_audio_ioctl,
132 .capability = SR_CAPABILITIES,
133 .generic_packet = sr_packet,
136 static void sr_kref_release(struct kref *kref);
138 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
140 return container_of(disk->private_data, struct scsi_cd, driver);
143 static int sr_runtime_suspend(struct device *dev)
145 struct scsi_cd *cd = dev_get_drvdata(dev);
147 if (!cd) /* E.g.: runtime suspend following sr_remove() */
150 if (cd->media_present)
157 * The get and put routines for the struct scsi_cd. Note this entity
158 * has a scsi_device pointer and owns a reference to this.
160 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
162 struct scsi_cd *cd = NULL;
164 mutex_lock(&sr_ref_mutex);
165 if (disk->private_data == NULL)
169 if (scsi_device_get(cd->device)) {
170 kref_put(&cd->kref, sr_kref_release);
174 mutex_unlock(&sr_ref_mutex);
178 static void scsi_cd_put(struct scsi_cd *cd)
180 struct scsi_device *sdev = cd->device;
182 mutex_lock(&sr_ref_mutex);
183 kref_put(&cd->kref, sr_kref_release);
184 scsi_device_put(sdev);
185 mutex_unlock(&sr_ref_mutex);
188 static unsigned int sr_get_events(struct scsi_device *sdev)
191 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
194 1 << 4, /* notification class: media */
196 0, sizeof(buf), /* allocation length */
199 struct event_header *eh = (void *)buf;
200 struct media_event_desc *med = (void *)(buf + 4);
201 struct scsi_sense_hdr sshdr;
204 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
205 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
206 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
207 return DISK_EVENT_MEDIA_CHANGE;
209 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
212 if (eh->nea || eh->notification_class != 0x4)
215 if (med->media_event_code == 1)
216 return DISK_EVENT_EJECT_REQUEST;
217 else if (med->media_event_code == 2)
218 return DISK_EVENT_MEDIA_CHANGE;
219 else if (med->media_event_code == 3)
220 return DISK_EVENT_MEDIA_CHANGE;
225 * This function checks to see if the media has been changed or eject
226 * button has been pressed. It is possible that we have already
227 * sensed a change, or the drive may have sensed one and not yet
228 * reported it. The past events are accumulated in sdev->changed and
229 * returned together with the current state.
231 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
232 unsigned int clearing, int slot)
234 struct scsi_cd *cd = cdi->handle;
236 struct scsi_sense_hdr sshdr;
240 /* no changer support */
241 if (CDSL_CURRENT != slot)
244 events = sr_get_events(cd->device);
245 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
248 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
249 * for several times in a row. We rely on TUR only for this likely
250 * broken device, to prevent generating incorrect media changed
251 * events for every open().
253 if (cd->ignore_get_event) {
254 events &= ~DISK_EVENT_MEDIA_CHANGE;
259 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
260 * is being cleared. Note that there are devices which hang
261 * if asked to execute TUR repeatedly.
263 if (cd->device->changed) {
264 events |= DISK_EVENT_MEDIA_CHANGE;
265 cd->device->changed = 0;
266 cd->tur_changed = true;
269 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
272 /* let's see whether the media is there with TUR */
273 last_present = cd->media_present;
274 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
277 * Media is considered to be present if TUR succeeds or fails with
278 * sense data indicating something other than media-not-present
281 cd->media_present = scsi_status_is_good(ret) ||
282 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
284 if (last_present != cd->media_present)
285 cd->device->changed = 1;
287 if (cd->device->changed) {
288 events |= DISK_EVENT_MEDIA_CHANGE;
289 cd->device->changed = 0;
290 cd->tur_changed = true;
293 if (cd->ignore_get_event)
296 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
297 if (!cd->tur_changed) {
298 if (cd->get_event_changed) {
299 if (cd->tur_mismatch++ > 8) {
300 sr_printk(KERN_WARNING, cd,
301 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
302 cd->ignore_get_event = true;
305 cd->tur_mismatch = 0;
308 cd->tur_changed = false;
309 cd->get_event_changed = false;
315 * sr_done is the interrupt routine for the device driver.
317 * It will be notified on the end of a SCSI read / write, and will take one
318 * of several actions based on success or failure.
320 static int sr_done(struct scsi_cmnd *SCpnt)
322 int result = SCpnt->result;
323 int this_count = scsi_bufflen(SCpnt);
324 int good_bytes = (result == 0 ? this_count : 0);
325 int block_sectors = 0;
327 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
330 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
334 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
335 * success. Since this is a relatively rare error condition, no
336 * care is taken to avoid unnecessary additional work such as
337 * memcpy's that could be avoided.
339 if (driver_byte(result) != 0 && /* An error occurred */
340 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
341 switch (SCpnt->sense_buffer[2]) {
343 case VOLUME_OVERFLOW:
344 case ILLEGAL_REQUEST:
345 if (!(SCpnt->sense_buffer[0] & 0x90))
347 error_sector = (SCpnt->sense_buffer[3] << 24) |
348 (SCpnt->sense_buffer[4] << 16) |
349 (SCpnt->sense_buffer[5] << 8) |
350 SCpnt->sense_buffer[6];
351 if (SCpnt->request->bio != NULL)
353 bio_sectors(SCpnt->request->bio);
354 if (block_sectors < 4)
356 if (cd->device->sector_size == 2048)
358 error_sector &= ~(block_sectors - 1);
359 good_bytes = (error_sector -
360 blk_rq_pos(SCpnt->request)) << 9;
361 if (good_bytes < 0 || good_bytes >= this_count)
364 * The SCSI specification allows for the value
365 * returned by READ CAPACITY to be up to 75 2K
366 * sectors past the last readable block.
367 * Therefore, if we hit a medium error within the
368 * last 75 2K sectors, we decrease the saved size
371 if (error_sector < get_capacity(cd->disk) &&
372 cd->capacity - error_sector < 4 * 75)
373 set_capacity(cd->disk, error_sector);
376 case RECOVERED_ERROR:
377 good_bytes = this_count;
388 static int sr_init_command(struct scsi_cmnd *SCpnt)
390 int block = 0, this_count, s_size;
392 struct request *rq = SCpnt->request;
395 ret = scsi_init_io(SCpnt);
396 if (ret != BLKPREP_OK)
398 WARN_ON_ONCE(SCpnt != rq->special);
399 cd = scsi_cd(rq->rq_disk);
401 /* from here on until we're complete, any goto out
402 * is used for a killable error condition */
405 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
406 "Doing sr request, block = %d\n", block));
408 if (!cd->device || !scsi_device_online(cd->device)) {
409 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
410 "Finishing %u sectors\n", blk_rq_sectors(rq)));
411 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
412 "Retry with 0x%p\n", SCpnt));
416 if (cd->device->changed) {
418 * quietly refuse to do anything to a changed disc until the
419 * changed bit has been reset
425 * we do lazy blocksize switching (when reading XA sectors,
426 * see CDROMREADMODE2 ioctl)
428 s_size = cd->device->sector_size;
431 sr_set_blocklength(cd, 2048);
433 scmd_printk(KERN_INFO, SCpnt,
434 "can't switch blocksize: in interrupt\n");
437 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
438 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
442 switch (req_op(rq)) {
446 SCpnt->cmnd[0] = WRITE_10;
447 cd->cdi.media_written = 1;
450 SCpnt->cmnd[0] = READ_10;
453 blk_dump_rq_flags(rq, "Unknown sr command");
458 struct scatterlist *sg;
459 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
461 scsi_for_each_sg(SCpnt, sg, sg_count, i)
464 if (size != scsi_bufflen(SCpnt)) {
465 scmd_printk(KERN_ERR, SCpnt,
466 "mismatch count %d, bytes %d\n",
467 size, scsi_bufflen(SCpnt));
468 if (scsi_bufflen(SCpnt) > size)
469 SCpnt->sdb.length = size;
474 * request doesn't start on hw block boundary, add scatter pads
476 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
477 (scsi_bufflen(SCpnt) % s_size)) {
478 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
482 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
485 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
486 "%s %d/%u 512 byte blocks.\n",
487 (rq_data_dir(rq) == WRITE) ?
488 "writing" : "reading",
489 this_count, blk_rq_sectors(rq)));
492 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
494 if (this_count > 0xffff) {
496 SCpnt->sdb.length = this_count * s_size;
499 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
500 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
501 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
502 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
503 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
504 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
505 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
508 * We shouldn't disconnect in the middle of a sector, so with a dumb
509 * host adapter, it's safe to assume that we can at least transfer
510 * this many bytes between each connect / disconnect.
512 SCpnt->transfersize = cd->device->sector_size;
513 SCpnt->underflow = this_count << 9;
514 SCpnt->allowed = MAX_RETRIES;
517 * This indicates that the command is ready from our end to be
525 static int sr_block_open(struct block_device *bdev, fmode_t mode)
528 struct scsi_device *sdev;
531 cd = scsi_cd_get(bdev->bd_disk);
536 scsi_autopm_get_device(sdev);
537 check_disk_change(bdev);
539 mutex_lock(&sr_mutex);
540 ret = cdrom_open(&cd->cdi, bdev, mode);
541 mutex_unlock(&sr_mutex);
543 scsi_autopm_put_device(sdev);
551 static void sr_block_release(struct gendisk *disk, fmode_t mode)
553 struct scsi_cd *cd = scsi_cd(disk);
554 mutex_lock(&sr_mutex);
555 cdrom_release(&cd->cdi, mode);
557 mutex_unlock(&sr_mutex);
560 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
563 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
564 struct scsi_device *sdev = cd->device;
565 void __user *argp = (void __user *)arg;
568 mutex_lock(&sr_mutex);
570 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
571 (mode & FMODE_NDELAY) != 0);
575 scsi_autopm_get_device(sdev);
578 * Send SCSI addressing ioctls directly to mid level, send other
579 * ioctls to cdrom/block level.
582 case SCSI_IOCTL_GET_IDLUN:
583 case SCSI_IOCTL_GET_BUS_NUMBER:
584 ret = scsi_ioctl(sdev, cmd, argp);
588 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
592 ret = scsi_ioctl(sdev, cmd, argp);
595 scsi_autopm_put_device(sdev);
598 mutex_unlock(&sr_mutex);
602 static unsigned int sr_block_check_events(struct gendisk *disk,
603 unsigned int clearing)
605 unsigned int ret = 0;
608 cd = scsi_cd_get(disk);
612 if (!atomic_read(&cd->device->disk_events_disable_depth))
613 ret = cdrom_check_events(&cd->cdi, clearing);
619 static int sr_block_revalidate_disk(struct gendisk *disk)
621 struct scsi_sense_hdr sshdr;
624 cd = scsi_cd_get(disk);
628 /* if the unit is not ready, nothing more to do */
629 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
632 sr_cd_check(&cd->cdi);
639 static const struct block_device_operations sr_bdops =
641 .owner = THIS_MODULE,
642 .open = sr_block_open,
643 .release = sr_block_release,
644 .ioctl = sr_block_ioctl,
645 .check_events = sr_block_check_events,
646 .revalidate_disk = sr_block_revalidate_disk,
648 * No compat_ioctl for now because sr_block_ioctl never
649 * seems to pass arbitrary ioctls down to host drivers.
653 static int sr_open(struct cdrom_device_info *cdi, int purpose)
655 struct scsi_cd *cd = cdi->handle;
656 struct scsi_device *sdev = cd->device;
660 * If the device is in error recovery, wait until it is done.
661 * If the device is offline, then disallow any access to it.
664 if (!scsi_block_when_processing_errors(sdev))
673 static void sr_release(struct cdrom_device_info *cdi)
675 struct scsi_cd *cd = cdi->handle;
677 if (cd->device->sector_size > 2048)
678 sr_set_blocklength(cd, 2048);
682 static int sr_probe(struct device *dev)
684 struct scsi_device *sdev = to_scsi_device(dev);
685 struct gendisk *disk;
689 scsi_autopm_get_device(sdev);
691 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
695 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
699 kref_init(&cd->kref);
701 disk = alloc_disk(1);
705 spin_lock(&sr_index_lock);
706 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
707 if (minor == SR_DISKS) {
708 spin_unlock(&sr_index_lock);
712 __set_bit(minor, sr_index_bits);
713 spin_unlock(&sr_index_lock);
715 disk->major = SCSI_CDROM_MAJOR;
716 disk->first_minor = minor;
717 sprintf(disk->disk_name, "sr%d", minor);
718 disk->fops = &sr_bdops;
719 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
720 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
722 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
726 cd->driver = &sr_template;
728 cd->capacity = 0x1fffff;
729 cd->device->changed = 1; /* force recheck CD type */
730 cd->media_present = 1;
732 cd->readcd_known = 0;
735 cd->cdi.ops = &sr_dops;
738 cd->cdi.capacity = 1;
739 sprintf(cd->cdi.name, "sr%d", minor);
741 sdev->sector_size = 2048; /* A guess, just in case */
743 /* FIXME: need to handle a get_capabilities failure properly ?? */
744 get_capabilities(cd);
747 set_capacity(disk, cd->capacity);
748 disk->private_data = &cd->driver;
749 disk->queue = sdev->request_queue;
752 if (register_cdrom(&cd->cdi))
756 * Initialize block layer runtime PM stuffs before the
757 * periodic event checking request gets started in add_disk.
759 blk_pm_runtime_init(sdev->request_queue, dev);
761 dev_set_drvdata(dev, cd);
762 disk->flags |= GENHD_FL_REMOVABLE;
763 device_add_disk(&sdev->sdev_gendev, disk);
765 sdev_printk(KERN_DEBUG, sdev,
766 "Attached scsi CD-ROM %s\n", cd->cdi.name);
767 scsi_autopm_put_device(cd->device);
772 spin_lock(&sr_index_lock);
773 clear_bit(minor, sr_index_bits);
774 spin_unlock(&sr_index_lock);
780 scsi_autopm_put_device(sdev);
785 static void get_sectorsize(struct scsi_cd *cd)
787 unsigned char cmd[10];
788 unsigned char buffer[8];
789 int the_result, retries = 3;
791 struct request_queue *queue;
794 cmd[0] = READ_CAPACITY;
795 memset((void *) &cmd[1], 0, 9);
796 memset(buffer, 0, sizeof(buffer));
798 /* Do the command and wait.. */
799 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
800 buffer, sizeof(buffer), NULL,
801 SR_TIMEOUT, MAX_RETRIES, NULL);
805 } while (the_result && retries);
809 cd->capacity = 0x1fffff;
810 sector_size = 2048; /* A guess, just in case */
814 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
815 (buffer[2] << 8) | buffer[3]);
817 * READ_CAPACITY doesn't return the correct size on
818 * certain UDF media. If last_written is larger, use
821 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
823 if (!cdrom_get_last_written(&cd->cdi, &last_written))
824 cd->capacity = max_t(long, cd->capacity, last_written);
826 sector_size = (buffer[4] << 24) |
827 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
828 switch (sector_size) {
830 * HP 4020i CD-Recorder reports 2340 byte sectors
831 * Philips CD-Writers report 2352 byte sectors
833 * Use 2k sectors for them..
846 sr_printk(KERN_INFO, cd,
847 "unsupported sector size %d.", sector_size);
851 cd->device->sector_size = sector_size;
854 * Add this so that we have the ability to correctly gauge
855 * what the device is capable of.
857 set_capacity(cd->disk, cd->capacity);
860 queue = cd->device->request_queue;
861 blk_queue_logical_block_size(queue, sector_size);
866 static void get_capabilities(struct scsi_cd *cd)
868 unsigned char *buffer;
869 struct scsi_mode_data data;
870 struct scsi_sense_hdr sshdr;
871 unsigned int ms_len = 128;
874 static const char *loadmech[] =
887 /* allocate transfer buffer */
888 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
890 sr_printk(KERN_ERR, cd, "out of memory.\n");
894 /* eat unit attentions */
895 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
897 /* ask for mode page 0x2a */
898 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
899 SR_TIMEOUT, 3, &data, NULL);
901 if (!scsi_status_is_good(rc) || data.length > ms_len ||
902 data.header_length + data.block_descriptor_length > data.length) {
903 /* failed, drive doesn't have capabilities mode page */
905 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
906 CDC_DVD | CDC_DVD_RAM |
907 CDC_SELECT_DISC | CDC_SELECT_SPEED |
908 CDC_MRW | CDC_MRW_W | CDC_RAM);
910 sr_printk(KERN_INFO, cd, "scsi-1 drive");
914 n = data.header_length + data.block_descriptor_length;
915 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
916 cd->readcd_known = 1;
917 cd->readcd_cdda = buffer[n + 5] & 0x01;
918 /* print some capability bits */
919 sr_printk(KERN_INFO, cd,
920 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
921 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
923 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
924 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
925 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
926 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
927 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
928 loadmech[buffer[n + 6] >> 5]);
929 if ((buffer[n + 6] >> 5) == 0)
930 /* caddy drives can't close tray... */
931 cd->cdi.mask |= CDC_CLOSE_TRAY;
932 if ((buffer[n + 2] & 0x8) == 0)
933 /* not a DVD drive */
934 cd->cdi.mask |= CDC_DVD;
935 if ((buffer[n + 3] & 0x20) == 0)
936 /* can't write DVD-RAM media */
937 cd->cdi.mask |= CDC_DVD_RAM;
938 if ((buffer[n + 3] & 0x10) == 0)
939 /* can't write DVD-R media */
940 cd->cdi.mask |= CDC_DVD_R;
941 if ((buffer[n + 3] & 0x2) == 0)
942 /* can't write CD-RW media */
943 cd->cdi.mask |= CDC_CD_RW;
944 if ((buffer[n + 3] & 0x1) == 0)
945 /* can't write CD-R media */
946 cd->cdi.mask |= CDC_CD_R;
947 if ((buffer[n + 6] & 0x8) == 0)
949 cd->cdi.mask |= CDC_OPEN_TRAY;
951 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
952 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
954 cdrom_number_of_slots(&cd->cdi);
955 if (cd->cdi.capacity <= 1)
957 cd->cdi.mask |= CDC_SELECT_DISC;
958 /*else I don't think it can close its tray
959 cd->cdi.mask |= CDC_CLOSE_TRAY; */
962 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
964 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
965 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
973 * sr_packet() is the entry point for the generic commands generated
974 * by the Uniform CD-ROM layer.
976 static int sr_packet(struct cdrom_device_info *cdi,
977 struct packet_command *cgc)
979 struct scsi_cd *cd = cdi->handle;
980 struct scsi_device *sdev = cd->device;
982 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
983 return -EDRIVE_CANT_DO_THIS;
985 if (cgc->timeout <= 0)
986 cgc->timeout = IOCTL_TIMEOUT;
988 sr_do_ioctl(cd, cgc);
994 * sr_kref_release - Called to free the scsi_cd structure
995 * @kref: pointer to embedded kref
997 * sr_ref_mutex must be held entering this routine. Because it is
998 * called on last put, you should always use the scsi_cd_get()
999 * scsi_cd_put() helpers which manipulate the semaphore directly
1000 * and never do a direct kref_put().
1002 static void sr_kref_release(struct kref *kref)
1004 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
1005 struct gendisk *disk = cd->disk;
1007 spin_lock(&sr_index_lock);
1008 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
1009 spin_unlock(&sr_index_lock);
1011 unregister_cdrom(&cd->cdi);
1013 disk->private_data = NULL;
1020 static int sr_remove(struct device *dev)
1022 struct scsi_cd *cd = dev_get_drvdata(dev);
1024 scsi_autopm_get_device(cd->device);
1026 del_gendisk(cd->disk);
1027 dev_set_drvdata(dev, NULL);
1029 mutex_lock(&sr_ref_mutex);
1030 kref_put(&cd->kref, sr_kref_release);
1031 mutex_unlock(&sr_ref_mutex);
1036 static int __init init_sr(void)
1040 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1043 rc = scsi_register_driver(&sr_template.gendrv);
1045 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1050 static void __exit exit_sr(void)
1052 scsi_unregister_driver(&sr_template.gendrv);
1053 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1056 module_init(init_sr);
1057 module_exit(exit_sr);
1058 MODULE_LICENSE("GPL");