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 <asm/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_done(struct scsi_cmnd *);
83 static int sr_runtime_suspend(struct device *dev);
85 static struct dev_pm_ops sr_pm_ops = {
86 .runtime_suspend = sr_runtime_suspend,
89 static struct scsi_driver sr_template = {
100 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
101 static DEFINE_SPINLOCK(sr_index_lock);
103 /* This semaphore is used to mediate the 0->1 reference get in the
104 * face of object destruction (i.e. we can't allow a get on an
105 * object after last put) */
106 static DEFINE_MUTEX(sr_ref_mutex);
108 static int sr_open(struct cdrom_device_info *, int);
109 static void sr_release(struct cdrom_device_info *);
111 static void get_sectorsize(struct scsi_cd *);
112 static void get_capabilities(struct scsi_cd *);
114 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
115 unsigned int clearing, int slot);
116 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
118 static struct cdrom_device_ops sr_dops = {
120 .release = sr_release,
121 .drive_status = sr_drive_status,
122 .check_events = sr_check_events,
123 .tray_move = sr_tray_move,
124 .lock_door = sr_lock_door,
125 .select_speed = sr_select_speed,
126 .get_last_session = sr_get_last_session,
127 .get_mcn = sr_get_mcn,
129 .audio_ioctl = sr_audio_ioctl,
130 .capability = SR_CAPABILITIES,
131 .generic_packet = sr_packet,
134 static void sr_kref_release(struct kref *kref);
136 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
138 return container_of(disk->private_data, struct scsi_cd, driver);
141 static int sr_runtime_suspend(struct device *dev)
143 struct scsi_cd *cd = dev_get_drvdata(dev);
145 if (cd->media_present)
152 * The get and put routines for the struct scsi_cd. Note this entity
153 * has a scsi_device pointer and owns a reference to this.
155 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
157 struct scsi_cd *cd = NULL;
159 mutex_lock(&sr_ref_mutex);
160 if (disk->private_data == NULL)
164 if (scsi_device_get(cd->device))
166 if (!scsi_autopm_get_device(cd->device))
170 kref_put(&cd->kref, sr_kref_release);
173 mutex_unlock(&sr_ref_mutex);
177 static void scsi_cd_put(struct scsi_cd *cd)
179 struct scsi_device *sdev = cd->device;
181 mutex_lock(&sr_ref_mutex);
182 kref_put(&cd->kref, sr_kref_release);
183 scsi_autopm_put_device(sdev);
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;
223 * This function checks to see if the media has been changed or eject
224 * button has been pressed. It is possible that we have already
225 * sensed a change, or the drive may have sensed one and not yet
226 * reported it. The past events are accumulated in sdev->changed and
227 * returned together with the current state.
229 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
230 unsigned int clearing, int slot)
232 struct scsi_cd *cd = cdi->handle;
234 struct scsi_sense_hdr sshdr;
238 /* no changer support */
239 if (CDSL_CURRENT != slot)
242 events = sr_get_events(cd->device);
243 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
246 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
247 * for several times in a row. We rely on TUR only for this likely
248 * broken device, to prevent generating incorrect media changed
249 * events for every open().
251 if (cd->ignore_get_event) {
252 events &= ~DISK_EVENT_MEDIA_CHANGE;
257 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
258 * is being cleared. Note that there are devices which hang
259 * if asked to execute TUR repeatedly.
261 if (cd->device->changed) {
262 events |= DISK_EVENT_MEDIA_CHANGE;
263 cd->device->changed = 0;
264 cd->tur_changed = true;
267 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
270 /* let's see whether the media is there with TUR */
271 last_present = cd->media_present;
272 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
275 * Media is considered to be present if TUR succeeds or fails with
276 * sense data indicating something other than media-not-present
279 cd->media_present = scsi_status_is_good(ret) ||
280 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
282 if (last_present != cd->media_present)
283 cd->device->changed = 1;
285 if (cd->device->changed) {
286 events |= DISK_EVENT_MEDIA_CHANGE;
287 cd->device->changed = 0;
288 cd->tur_changed = true;
291 if (cd->ignore_get_event)
294 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
295 if (!cd->tur_changed) {
296 if (cd->get_event_changed) {
297 if (cd->tur_mismatch++ > 8) {
298 sdev_printk(KERN_WARNING, cd->device,
299 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
300 cd->ignore_get_event = true;
303 cd->tur_mismatch = 0;
306 cd->tur_changed = false;
307 cd->get_event_changed = false;
313 * sr_done is the interrupt routine for the device driver.
315 * It will be notified on the end of a SCSI read / write, and will take one
316 * of several actions based on success or failure.
318 static int sr_done(struct scsi_cmnd *SCpnt)
320 int result = SCpnt->result;
321 int this_count = scsi_bufflen(SCpnt);
322 int good_bytes = (result == 0 ? this_count : 0);
323 int block_sectors = 0;
325 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
328 printk("sr.c done: %x\n", result);
332 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
333 * success. Since this is a relatively rare error condition, no
334 * care is taken to avoid unnecessary additional work such as
335 * memcpy's that could be avoided.
337 if (driver_byte(result) != 0 && /* An error occurred */
338 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
339 switch (SCpnt->sense_buffer[2]) {
341 case VOLUME_OVERFLOW:
342 case ILLEGAL_REQUEST:
343 if (!(SCpnt->sense_buffer[0] & 0x90))
345 error_sector = (SCpnt->sense_buffer[3] << 24) |
346 (SCpnt->sense_buffer[4] << 16) |
347 (SCpnt->sense_buffer[5] << 8) |
348 SCpnt->sense_buffer[6];
349 if (SCpnt->request->bio != NULL)
351 bio_sectors(SCpnt->request->bio);
352 if (block_sectors < 4)
354 if (cd->device->sector_size == 2048)
356 error_sector &= ~(block_sectors - 1);
357 good_bytes = (error_sector -
358 blk_rq_pos(SCpnt->request)) << 9;
359 if (good_bytes < 0 || good_bytes >= this_count)
362 * The SCSI specification allows for the value
363 * returned by READ CAPACITY to be up to 75 2K
364 * sectors past the last readable block.
365 * Therefore, if we hit a medium error within the
366 * last 75 2K sectors, we decrease the saved size
369 if (error_sector < get_capacity(cd->disk) &&
370 cd->capacity - error_sector < 4 * 75)
371 set_capacity(cd->disk, error_sector);
374 case RECOVERED_ERROR:
375 good_bytes = this_count;
386 static int sr_prep_fn(struct request_queue *q, struct request *rq)
388 int block = 0, this_count, s_size;
390 struct scsi_cmnd *SCpnt;
391 struct scsi_device *sdp = q->queuedata;
394 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
395 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
397 } else if (rq->cmd_type != REQ_TYPE_FS) {
401 ret = scsi_setup_fs_cmnd(sdp, rq);
402 if (ret != BLKPREP_OK)
405 cd = scsi_cd(rq->rq_disk);
407 /* from here on until we're complete, any goto out
408 * is used for a killable error condition */
411 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
412 cd->disk->disk_name, block));
414 if (!cd->device || !scsi_device_online(cd->device)) {
415 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
416 blk_rq_sectors(rq)));
417 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
421 if (cd->device->changed) {
423 * quietly refuse to do anything to a changed disc until the
424 * changed bit has been reset
430 * we do lazy blocksize switching (when reading XA sectors,
431 * see CDROMREADMODE2 ioctl)
433 s_size = cd->device->sector_size;
436 sr_set_blocklength(cd, 2048);
438 printk("sr: can't switch blocksize: in interrupt\n");
441 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
442 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
446 if (rq_data_dir(rq) == WRITE) {
447 if (!cd->device->writeable)
449 SCpnt->cmnd[0] = WRITE_10;
450 SCpnt->sc_data_direction = DMA_TO_DEVICE;
451 cd->cdi.media_written = 1;
452 } else if (rq_data_dir(rq) == READ) {
453 SCpnt->cmnd[0] = READ_10;
454 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
456 blk_dump_rq_flags(rq, "Unknown sr command");
461 struct scatterlist *sg;
462 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
464 scsi_for_each_sg(SCpnt, sg, sg_count, i)
467 if (size != scsi_bufflen(SCpnt)) {
468 scmd_printk(KERN_ERR, SCpnt,
469 "mismatch count %d, bytes %d\n",
470 size, scsi_bufflen(SCpnt));
471 if (scsi_bufflen(SCpnt) > size)
472 SCpnt->sdb.length = size;
477 * request doesn't start on hw block boundary, add scatter pads
479 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
480 (scsi_bufflen(SCpnt) % s_size)) {
481 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
485 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
488 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
490 (rq_data_dir(rq) == WRITE) ?
491 "writing" : "reading",
492 this_count, blk_rq_sectors(rq)));
495 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
497 if (this_count > 0xffff) {
499 SCpnt->sdb.length = this_count * s_size;
502 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
503 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
504 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
505 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
506 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
507 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
508 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
511 * We shouldn't disconnect in the middle of a sector, so with a dumb
512 * host adapter, it's safe to assume that we can at least transfer
513 * this many bytes between each connect / disconnect.
515 SCpnt->transfersize = cd->device->sector_size;
516 SCpnt->underflow = this_count << 9;
517 SCpnt->allowed = MAX_RETRIES;
520 * This indicates that the command is ready from our end to be
525 return scsi_prep_return(q, rq, ret);
528 static int sr_block_open(struct block_device *bdev, fmode_t mode)
533 mutex_lock(&sr_mutex);
534 cd = scsi_cd_get(bdev->bd_disk);
536 ret = cdrom_open(&cd->cdi, bdev, mode);
540 mutex_unlock(&sr_mutex);
544 static int sr_block_release(struct gendisk *disk, fmode_t mode)
546 struct scsi_cd *cd = scsi_cd(disk);
547 mutex_lock(&sr_mutex);
548 cdrom_release(&cd->cdi, mode);
550 mutex_unlock(&sr_mutex);
554 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
557 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
558 struct scsi_device *sdev = cd->device;
559 void __user *argp = (void __user *)arg;
562 scsi_autopm_get_device(cd->device);
564 mutex_lock(&sr_mutex);
567 * Send SCSI addressing ioctls directly to mid level, send other
568 * ioctls to cdrom/block level.
571 case SCSI_IOCTL_GET_IDLUN:
572 case SCSI_IOCTL_GET_BUS_NUMBER:
573 ret = scsi_ioctl(sdev, cmd, argp);
577 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
582 * ENODEV means that we didn't recognise the ioctl, or that we
583 * cannot execute it in the current device state. In either
584 * case fall through to scsi_ioctl, which will return ENDOEV again
585 * if it doesn't recognise the ioctl
587 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
588 (mode & FMODE_NDELAY) != 0);
591 ret = scsi_ioctl(sdev, cmd, argp);
594 mutex_unlock(&sr_mutex);
595 scsi_autopm_put_device(cd->device);
599 static unsigned int sr_block_check_events(struct gendisk *disk,
600 unsigned int clearing)
602 struct scsi_cd *cd = scsi_cd(disk);
605 if (atomic_read(&cd->device->disk_events_disable_depth) == 0) {
606 scsi_autopm_get_device(cd->device);
607 ret = cdrom_check_events(&cd->cdi, clearing);
608 scsi_autopm_put_device(cd->device);
616 static int sr_block_revalidate_disk(struct gendisk *disk)
618 struct scsi_cd *cd = scsi_cd(disk);
619 struct scsi_sense_hdr sshdr;
621 scsi_autopm_get_device(cd->device);
623 /* if the unit is not ready, nothing more to do */
624 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
627 sr_cd_check(&cd->cdi);
630 scsi_autopm_put_device(cd->device);
634 static const struct block_device_operations sr_bdops =
636 .owner = THIS_MODULE,
637 .open = sr_block_open,
638 .release = sr_block_release,
639 .ioctl = sr_block_ioctl,
640 .check_events = sr_block_check_events,
641 .revalidate_disk = sr_block_revalidate_disk,
643 * No compat_ioctl for now because sr_block_ioctl never
644 * seems to pass arbitrary ioctls down to host drivers.
648 static int sr_open(struct cdrom_device_info *cdi, int purpose)
650 struct scsi_cd *cd = cdi->handle;
651 struct scsi_device *sdev = cd->device;
655 * If the device is in error recovery, wait until it is done.
656 * If the device is offline, then disallow any access to it.
659 if (!scsi_block_when_processing_errors(sdev))
668 static void sr_release(struct cdrom_device_info *cdi)
670 struct scsi_cd *cd = cdi->handle;
672 if (cd->device->sector_size > 2048)
673 sr_set_blocklength(cd, 2048);
677 static int sr_probe(struct device *dev)
679 struct scsi_device *sdev = to_scsi_device(dev);
680 struct gendisk *disk;
685 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
689 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
693 kref_init(&cd->kref);
695 disk = alloc_disk(1);
699 spin_lock(&sr_index_lock);
700 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
701 if (minor == SR_DISKS) {
702 spin_unlock(&sr_index_lock);
706 __set_bit(minor, sr_index_bits);
707 spin_unlock(&sr_index_lock);
709 disk->major = SCSI_CDROM_MAJOR;
710 disk->first_minor = minor;
711 sprintf(disk->disk_name, "sr%d", minor);
712 disk->fops = &sr_bdops;
713 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
714 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
716 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
720 cd->driver = &sr_template;
722 cd->capacity = 0x1fffff;
723 cd->device->changed = 1; /* force recheck CD type */
724 cd->media_present = 1;
726 cd->readcd_known = 0;
729 cd->cdi.ops = &sr_dops;
732 cd->cdi.capacity = 1;
733 sprintf(cd->cdi.name, "sr%d", minor);
735 sdev->sector_size = 2048; /* A guess, just in case */
737 /* FIXME: need to handle a get_capabilities failure properly ?? */
738 get_capabilities(cd);
739 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
742 disk->driverfs_dev = &sdev->sdev_gendev;
743 set_capacity(disk, cd->capacity);
744 disk->private_data = &cd->driver;
745 disk->queue = sdev->request_queue;
748 if (register_cdrom(&cd->cdi))
751 dev_set_drvdata(dev, cd);
752 disk->flags |= GENHD_FL_REMOVABLE;
755 sdev_printk(KERN_DEBUG, sdev,
756 "Attached scsi CD-ROM %s\n", cd->cdi.name);
757 scsi_autopm_put_device(cd->device);
770 static void get_sectorsize(struct scsi_cd *cd)
772 unsigned char cmd[10];
773 unsigned char buffer[8];
774 int the_result, retries = 3;
776 struct request_queue *queue;
779 cmd[0] = READ_CAPACITY;
780 memset((void *) &cmd[1], 0, 9);
781 memset(buffer, 0, sizeof(buffer));
783 /* Do the command and wait.. */
784 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
785 buffer, sizeof(buffer), NULL,
786 SR_TIMEOUT, MAX_RETRIES, NULL);
790 } while (the_result && retries);
794 cd->capacity = 0x1fffff;
795 sector_size = 2048; /* A guess, just in case */
799 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
800 (buffer[2] << 8) | buffer[3]);
802 * READ_CAPACITY doesn't return the correct size on
803 * certain UDF media. If last_written is larger, use
806 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
808 if (!cdrom_get_last_written(&cd->cdi, &last_written))
809 cd->capacity = max_t(long, cd->capacity, last_written);
811 sector_size = (buffer[4] << 24) |
812 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
813 switch (sector_size) {
815 * HP 4020i CD-Recorder reports 2340 byte sectors
816 * Philips CD-Writers report 2352 byte sectors
818 * Use 2k sectors for them..
831 printk("%s: unsupported sector size %d.\n",
832 cd->cdi.name, sector_size);
836 cd->device->sector_size = sector_size;
839 * Add this so that we have the ability to correctly gauge
840 * what the device is capable of.
842 set_capacity(cd->disk, cd->capacity);
845 queue = cd->device->request_queue;
846 blk_queue_logical_block_size(queue, sector_size);
851 static void get_capabilities(struct scsi_cd *cd)
853 unsigned char *buffer;
854 struct scsi_mode_data data;
855 struct scsi_sense_hdr sshdr;
858 static const char *loadmech[] =
871 /* allocate transfer buffer */
872 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
874 printk(KERN_ERR "sr: out of memory.\n");
878 /* eat unit attentions */
879 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
881 /* ask for mode page 0x2a */
882 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
883 SR_TIMEOUT, 3, &data, NULL);
885 if (!scsi_status_is_good(rc)) {
886 /* failed, drive doesn't have capabilities mode page */
888 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
889 CDC_DVD | CDC_DVD_RAM |
890 CDC_SELECT_DISC | CDC_SELECT_SPEED |
891 CDC_MRW | CDC_MRW_W | CDC_RAM);
893 printk("%s: scsi-1 drive\n", cd->cdi.name);
897 n = data.header_length + data.block_descriptor_length;
898 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
899 cd->readcd_known = 1;
900 cd->readcd_cdda = buffer[n + 5] & 0x01;
901 /* print some capability bits */
902 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
903 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
905 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
906 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
907 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
908 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
909 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
910 loadmech[buffer[n + 6] >> 5]);
911 if ((buffer[n + 6] >> 5) == 0)
912 /* caddy drives can't close tray... */
913 cd->cdi.mask |= CDC_CLOSE_TRAY;
914 if ((buffer[n + 2] & 0x8) == 0)
915 /* not a DVD drive */
916 cd->cdi.mask |= CDC_DVD;
917 if ((buffer[n + 3] & 0x20) == 0)
918 /* can't write DVD-RAM media */
919 cd->cdi.mask |= CDC_DVD_RAM;
920 if ((buffer[n + 3] & 0x10) == 0)
921 /* can't write DVD-R media */
922 cd->cdi.mask |= CDC_DVD_R;
923 if ((buffer[n + 3] & 0x2) == 0)
924 /* can't write CD-RW media */
925 cd->cdi.mask |= CDC_CD_RW;
926 if ((buffer[n + 3] & 0x1) == 0)
927 /* can't write CD-R media */
928 cd->cdi.mask |= CDC_CD_R;
929 if ((buffer[n + 6] & 0x8) == 0)
931 cd->cdi.mask |= CDC_OPEN_TRAY;
933 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
934 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
936 cdrom_number_of_slots(&cd->cdi);
937 if (cd->cdi.capacity <= 1)
939 cd->cdi.mask |= CDC_SELECT_DISC;
940 /*else I don't think it can close its tray
941 cd->cdi.mask |= CDC_CLOSE_TRAY; */
944 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
946 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
947 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
948 cd->device->writeable = 1;
955 * sr_packet() is the entry point for the generic commands generated
956 * by the Uniform CD-ROM layer.
958 static int sr_packet(struct cdrom_device_info *cdi,
959 struct packet_command *cgc)
961 struct scsi_cd *cd = cdi->handle;
962 struct scsi_device *sdev = cd->device;
964 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
965 return -EDRIVE_CANT_DO_THIS;
967 if (cgc->timeout <= 0)
968 cgc->timeout = IOCTL_TIMEOUT;
970 sr_do_ioctl(cd, cgc);
976 * sr_kref_release - Called to free the scsi_cd structure
977 * @kref: pointer to embedded kref
979 * sr_ref_mutex must be held entering this routine. Because it is
980 * called on last put, you should always use the scsi_cd_get()
981 * scsi_cd_put() helpers which manipulate the semaphore directly
982 * and never do a direct kref_put().
984 static void sr_kref_release(struct kref *kref)
986 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
987 struct gendisk *disk = cd->disk;
989 spin_lock(&sr_index_lock);
990 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
991 spin_unlock(&sr_index_lock);
993 unregister_cdrom(&cd->cdi);
995 disk->private_data = NULL;
1002 static int sr_remove(struct device *dev)
1004 struct scsi_cd *cd = dev_get_drvdata(dev);
1006 scsi_autopm_get_device(cd->device);
1008 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
1009 del_gendisk(cd->disk);
1011 mutex_lock(&sr_ref_mutex);
1012 kref_put(&cd->kref, sr_kref_release);
1013 mutex_unlock(&sr_ref_mutex);
1018 static int __init init_sr(void)
1022 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1025 rc = scsi_register_driver(&sr_template.gendrv);
1027 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1032 static void __exit exit_sr(void)
1034 scsi_unregister_driver(&sr_template.gendrv);
1035 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1038 module_init(init_sr);
1039 module_exit(exit_sr);
1040 MODULE_LICENSE("GPL");