blob: fae6e95a629884cdcffdb50058b522419115e722 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * sr.c Copyright (C) 1992 David Giller
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * adapted from:
6 * sd.c Copyright (C) 1992 Drew Eckhardt
7 * Linux scsi disk driver by
8 * Drew Eckhardt <drew@colorado.edu>
9 *
10 * Modified by Eric Youngdale ericy@andante.org to
11 * add scatter-gather, multiple outstanding request, and other
12 * enhancements.
13 *
14 * Modified by Eric Youngdale eric@andante.org to support loadable
15 * low-level scsi drivers.
16 *
17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
18 * provide auto-eject.
19 *
20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
21 * generic cdrom interface
22 *
23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
24 * interface, capabilities probe additions, ioctl cleanups, etc.
25 *
26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
27 *
28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
29 * transparently and lose the GHOST hack
30 *
31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
32 * check resource allocation in sr_init and some cleanups
33 */
34
35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
38#include <linux/sched.h>
39#include <linux/mm.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>
Arjan van de Ven0b950672006-01-11 13:16:10 +010047#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/uaccess.h>
49
50#include <scsi/scsi.h>
51#include <scsi/scsi_dbg.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_driver.h>
James Bottomley820732b2005-06-12 22:21:29 -050054#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <scsi/scsi_eh.h>
56#include <scsi/scsi_host.h>
57#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#include "scsi_logging.h"
60#include "sr.h"
61
62
Rene Hermanf018fa52006-03-08 00:14:20 -080063MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
64MODULE_LICENSE("GPL");
65MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#define SR_DISKS 256
68
69#define MAX_RETRIES 3
70#define SR_TIMEOUT (30 * HZ)
71#define SR_CAPABILITIES \
72 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
73 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
Christoph Hellwig6a2900b2006-03-23 03:00:15 -080074 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
76 CDC_MRW|CDC_MRW_W|CDC_RAM)
77
78static int sr_probe(struct device *);
79static int sr_remove(struct device *);
80static int sr_init_command(struct scsi_cmnd *);
81
82static struct scsi_driver sr_template = {
83 .owner = THIS_MODULE,
84 .gendrv = {
85 .name = "sr",
86 .probe = sr_probe,
87 .remove = sr_remove,
88 },
89 .init_command = sr_init_command,
90};
91
92static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
93static DEFINE_SPINLOCK(sr_index_lock);
94
95/* This semaphore is used to mediate the 0->1 reference get in the
96 * face of object destruction (i.e. we can't allow a get on an
97 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +010098static DEFINE_MUTEX(sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100static int sr_open(struct cdrom_device_info *, int);
101static void sr_release(struct cdrom_device_info *);
102
103static void get_sectorsize(struct scsi_cd *);
104static void get_capabilities(struct scsi_cd *);
105
106static int sr_media_change(struct cdrom_device_info *, int);
107static int sr_packet(struct cdrom_device_info *, struct packet_command *);
108
109static struct cdrom_device_ops sr_dops = {
110 .open = sr_open,
111 .release = sr_release,
112 .drive_status = sr_drive_status,
113 .media_changed = sr_media_change,
114 .tray_move = sr_tray_move,
115 .lock_door = sr_lock_door,
116 .select_speed = sr_select_speed,
117 .get_last_session = sr_get_last_session,
118 .get_mcn = sr_get_mcn,
119 .reset = sr_reset,
120 .audio_ioctl = sr_audio_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 .capability = SR_CAPABILITIES,
122 .generic_packet = sr_packet,
123};
124
125static void sr_kref_release(struct kref *kref);
126
127static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
128{
129 return container_of(disk->private_data, struct scsi_cd, driver);
130}
131
132/*
133 * The get and put routines for the struct scsi_cd. Note this entity
134 * has a scsi_device pointer and owns a reference to this.
135 */
136static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
137{
138 struct scsi_cd *cd = NULL;
139
Arjan van de Ven0b950672006-01-11 13:16:10 +0100140 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (disk->private_data == NULL)
142 goto out;
143 cd = scsi_cd(disk);
144 kref_get(&cd->kref);
145 if (scsi_device_get(cd->device))
146 goto out_put;
147 goto out;
148
149 out_put:
150 kref_put(&cd->kref, sr_kref_release);
151 cd = NULL;
152 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +0100153 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return cd;
155}
156
Arjan van de Ven858119e2006-01-14 13:20:43 -0800157static void scsi_cd_put(struct scsi_cd *cd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
159 struct scsi_device *sdev = cd->device;
160
Arjan van de Ven0b950672006-01-11 13:16:10 +0100161 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 kref_put(&cd->kref, sr_kref_release);
163 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100164 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
167/*
168 * This function checks to see if the media has been changed in the
169 * CDROM drive. It is possible that we have already sensed a change,
170 * or the drive may have sensed one and not yet reported it. We must
171 * be ready for either case. This function always reports the current
172 * value of the changed bit. If flag is 0, then the changed bit is reset.
173 * This function could be done as an ioctl, but we would need to have
174 * an inode for that to work, and we do not always have one.
175 */
176
177int sr_media_change(struct cdrom_device_info *cdi, int slot)
178{
179 struct scsi_cd *cd = cdi->handle;
180 int retval;
181
182 if (CDSL_CURRENT != slot) {
183 /* no changer support */
184 return -EINVAL;
185 }
186
187 retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES);
188 if (retval) {
189 /* Unable to test, unit probably not ready. This usually
190 * means there is no disc in the drive. Mark as changed,
191 * and we will figure it out later once the drive is
192 * available again. */
193 cd->device->changed = 1;
194 return 1; /* This will force a flush, if called from
195 * check_disk_change */
196 };
197
198 retval = cd->device->changed;
199 cd->device->changed = 0;
200 /* If the disk changed, the capacity will now be different,
201 * so we force a re-read of this information */
202 if (retval) {
203 /* check multisession offset etc */
204 sr_cd_check(cdi);
205
Pete Zaitcev51490c82005-07-05 18:18:08 -0700206 get_sectorsize(cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 }
208 return retval;
209}
210
211/*
212 * rw_intr is the interrupt routine for the device driver.
213 *
214 * It will be notified on the end of a SCSI read / write, and will take on
215 * of several actions based on success or failure.
216 */
217static void rw_intr(struct scsi_cmnd * SCpnt)
218{
219 int result = SCpnt->result;
Christoph Hellwig5d5ff442006-06-03 13:21:13 +0200220 int this_count = SCpnt->request_bufflen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 int good_bytes = (result == 0 ? this_count : 0);
222 int block_sectors = 0;
223 long error_sector;
224 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
225
226#ifdef DEBUG
227 printk("sr.c done: %x\n", result);
228#endif
229
230 /*
231 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
232 * success. Since this is a relatively rare error condition, no
233 * care is taken to avoid unnecessary additional work such as
234 * memcpy's that could be avoided.
235 */
236 if (driver_byte(result) != 0 && /* An error occurred */
237 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
238 switch (SCpnt->sense_buffer[2]) {
239 case MEDIUM_ERROR:
240 case VOLUME_OVERFLOW:
241 case ILLEGAL_REQUEST:
242 if (!(SCpnt->sense_buffer[0] & 0x90))
243 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 error_sector = (SCpnt->sense_buffer[3] << 24) |
245 (SCpnt->sense_buffer[4] << 16) |
246 (SCpnt->sense_buffer[5] << 8) |
247 SCpnt->sense_buffer[6];
248 if (SCpnt->request->bio != NULL)
249 block_sectors =
250 bio_sectors(SCpnt->request->bio);
251 if (block_sectors < 4)
252 block_sectors = 4;
253 if (cd->device->sector_size == 2048)
254 error_sector <<= 2;
255 error_sector &= ~(block_sectors - 1);
256 good_bytes = (error_sector - SCpnt->request->sector) << 9;
257 if (good_bytes < 0 || good_bytes >= this_count)
258 good_bytes = 0;
259 /*
260 * The SCSI specification allows for the value
261 * returned by READ CAPACITY to be up to 75 2K
262 * sectors past the last readable block.
263 * Therefore, if we hit a medium error within the
264 * last 75 2K sectors, we decrease the saved size
265 * value.
266 */
267 if (error_sector < get_capacity(cd->disk) &&
268 cd->capacity - error_sector < 4 * 75)
269 set_capacity(cd->disk, error_sector);
270 break;
271
272 case RECOVERED_ERROR:
273
274 /*
275 * An error occured, but it recovered. Inform the
276 * user, but make sure that it's not treated as a
277 * hard error.
278 */
279 scsi_print_sense("sr", SCpnt);
280 SCpnt->result = 0;
281 SCpnt->sense_buffer[0] = 0x0;
282 good_bytes = this_count;
283 break;
284
285 default:
286 break;
287 }
288 }
289
290 /*
291 * This calls the generic completion function, now that we know
292 * how many actual sectors finished, and how many sectors we need
293 * to say have failed.
294 */
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700295 scsi_io_completion(SCpnt, good_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298static int sr_init_command(struct scsi_cmnd * SCpnt)
299{
300 int block=0, this_count, s_size, timeout = SR_TIMEOUT;
301 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
302
303 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
304 cd->disk->disk_name, block));
305
306 if (!cd->device || !scsi_device_online(cd->device)) {
307 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
308 SCpnt->request->nr_sectors));
309 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
310 return 0;
311 }
312
313 if (cd->device->changed) {
314 /*
315 * quietly refuse to do anything to a changed disc until the
316 * changed bit has been reset
317 */
318 return 0;
319 }
320
321 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 * we do lazy blocksize switching (when reading XA sectors,
323 * see CDROMREADMODE2 ioctl)
324 */
325 s_size = cd->device->sector_size;
326 if (s_size > 2048) {
327 if (!in_interrupt())
328 sr_set_blocklength(cd, 2048);
329 else
330 printk("sr: can't switch blocksize: in interrupt\n");
331 }
332
333 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400334 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return 0;
336 }
337
338 if (rq_data_dir(SCpnt->request) == WRITE) {
339 if (!cd->device->writeable)
340 return 0;
341 SCpnt->cmnd[0] = WRITE_10;
342 SCpnt->sc_data_direction = DMA_TO_DEVICE;
343 cd->cdi.media_written = 1;
344 } else if (rq_data_dir(SCpnt->request) == READ) {
345 SCpnt->cmnd[0] = READ_10;
346 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
347 } else {
348 blk_dump_rq_flags(SCpnt->request, "Unknown sr command");
349 return 0;
350 }
351
352 {
353 struct scatterlist *sg = SCpnt->request_buffer;
354 int i, size = 0;
355 for (i = 0; i < SCpnt->use_sg; i++)
356 size += sg[i].length;
357
358 if (size != SCpnt->request_bufflen && SCpnt->use_sg) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400359 scmd_printk(KERN_ERR, SCpnt,
360 "mismatch count %d, bytes %d\n",
361 size, SCpnt->request_bufflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (SCpnt->request_bufflen > size)
Christoph Hellwig631c2282006-07-08 20:42:15 +0200363 SCpnt->request_bufflen = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365 }
366
367 /*
368 * request doesn't start on hw block boundary, add scatter pads
369 */
370 if (((unsigned int)SCpnt->request->sector % (s_size >> 9)) ||
371 (SCpnt->request_bufflen % s_size)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400372 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 return 0;
374 }
375
376 this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9);
377
378
379 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
380 cd->cdi.name,
381 (rq_data_dir(SCpnt->request) == WRITE) ?
382 "writing" : "reading",
383 this_count, SCpnt->request->nr_sectors));
384
385 SCpnt->cmnd[1] = 0;
386 block = (unsigned int)SCpnt->request->sector / (s_size >> 9);
387
388 if (this_count > 0xffff) {
389 this_count = 0xffff;
Christoph Hellwig631c2282006-07-08 20:42:15 +0200390 SCpnt->request_bufflen = this_count * s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
392
393 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
394 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
395 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
396 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
397 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
398 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
399 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
400
401 /*
402 * We shouldn't disconnect in the middle of a sector, so with a dumb
403 * host adapter, it's safe to assume that we can at least transfer
404 * this many bytes between each connect / disconnect.
405 */
406 SCpnt->transfersize = cd->device->sector_size;
407 SCpnt->underflow = this_count << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 SCpnt->allowed = MAX_RETRIES;
409 SCpnt->timeout_per_command = timeout;
410
411 /*
412 * This is the completion routine we use. This is matched in terms
413 * of capability to this function.
414 */
415 SCpnt->done = rw_intr;
416
417 /*
418 * This indicates that the command is ready from our end to be
419 * queued.
420 */
421 return 1;
422}
423
424static int sr_block_open(struct inode *inode, struct file *file)
425{
426 struct gendisk *disk = inode->i_bdev->bd_disk;
Jayachandran C80d904c2005-10-18 17:11:16 -0700427 struct scsi_cd *cd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 int ret = 0;
429
430 if(!(cd = scsi_cd_get(disk)))
431 return -ENXIO;
432
433 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0)
434 scsi_cd_put(cd);
435
436 return ret;
437}
438
439static int sr_block_release(struct inode *inode, struct file *file)
440{
441 int ret;
442 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
443 ret = cdrom_release(&cd->cdi, file);
444 if(ret)
445 return ret;
446
447 scsi_cd_put(cd);
448
449 return 0;
450}
451
452static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd,
453 unsigned long arg)
454{
455 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
456 struct scsi_device *sdev = cd->device;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800457 void __user *argp = (void __user *)arg;
458 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800460 /*
461 * Send SCSI addressing ioctls directly to mid level, send other
462 * ioctls to cdrom/block level.
463 */
464 switch (cmd) {
465 case SCSI_IOCTL_GET_IDLUN:
466 case SCSI_IOCTL_GET_BUS_NUMBER:
467 return scsi_ioctl(sdev, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 }
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800469
470 ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg);
471 if (ret != ENOSYS)
472 return ret;
473
474 /*
475 * ENODEV means that we didn't recognise the ioctl, or that we
476 * cannot execute it in the current device state. In either
477 * case fall through to scsi_ioctl, which will return ENDOEV again
478 * if it doesn't recognise the ioctl
479 */
480 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL);
481 if (ret != -ENODEV)
482 return ret;
483 return scsi_ioctl(sdev, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484}
485
486static int sr_block_media_changed(struct gendisk *disk)
487{
488 struct scsi_cd *cd = scsi_cd(disk);
489 return cdrom_media_changed(&cd->cdi);
490}
491
492static struct block_device_operations sr_bdops =
493{
494 .owner = THIS_MODULE,
495 .open = sr_block_open,
496 .release = sr_block_release,
497 .ioctl = sr_block_ioctl,
498 .media_changed = sr_block_media_changed,
499 /*
500 * No compat_ioctl for now because sr_block_ioctl never
501 * seems to pass arbitary ioctls down to host drivers.
502 */
503};
504
505static int sr_open(struct cdrom_device_info *cdi, int purpose)
506{
507 struct scsi_cd *cd = cdi->handle;
508 struct scsi_device *sdev = cd->device;
509 int retval;
510
511 /*
512 * If the device is in error recovery, wait until it is done.
513 * If the device is offline, then disallow any access to it.
514 */
515 retval = -ENXIO;
516 if (!scsi_block_when_processing_errors(sdev))
517 goto error_out;
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 return 0;
520
521error_out:
522 return retval;
523}
524
525static void sr_release(struct cdrom_device_info *cdi)
526{
527 struct scsi_cd *cd = cdi->handle;
528
529 if (cd->device->sector_size > 2048)
530 sr_set_blocklength(cd, 2048);
531
532}
533
534static int sr_probe(struct device *dev)
535{
536 struct scsi_device *sdev = to_scsi_device(dev);
537 struct gendisk *disk;
538 struct scsi_cd *cd;
539 int minor, error;
540
541 error = -ENODEV;
542 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
543 goto fail;
544
545 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -0500546 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if (!cd)
548 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 kref_init(&cd->kref);
551
552 disk = alloc_disk(1);
553 if (!disk)
554 goto fail_free;
555
556 spin_lock(&sr_index_lock);
557 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
558 if (minor == SR_DISKS) {
559 spin_unlock(&sr_index_lock);
560 error = -EBUSY;
561 goto fail_put;
562 }
563 __set_bit(minor, sr_index_bits);
564 spin_unlock(&sr_index_lock);
565
566 disk->major = SCSI_CDROM_MAJOR;
567 disk->first_minor = minor;
568 sprintf(disk->disk_name, "sr%d", minor);
569 disk->fops = &sr_bdops;
570 disk->flags = GENHD_FL_CD;
571
572 cd->device = sdev;
573 cd->disk = disk;
574 cd->driver = &sr_template;
575 cd->disk = disk;
576 cd->capacity = 0x1fffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 cd->device->changed = 1; /* force recheck CD type */
578 cd->use = 1;
579 cd->readcd_known = 0;
580 cd->readcd_cdda = 0;
581
582 cd->cdi.ops = &sr_dops;
583 cd->cdi.handle = cd;
584 cd->cdi.mask = 0;
585 cd->cdi.capacity = 1;
586 sprintf(cd->cdi.name, "sr%d", minor);
587
588 sdev->sector_size = 2048; /* A guess, just in case */
589
590 /* FIXME: need to handle a get_capabilities failure properly ?? */
591 get_capabilities(cd);
592 sr_vendor_init(cd);
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 disk->driverfs_dev = &sdev->sdev_gendev;
595 set_capacity(disk, cd->capacity);
596 disk->private_data = &cd->driver;
597 disk->queue = sdev->request_queue;
598 cd->cdi.disk = disk;
599
600 if (register_cdrom(&cd->cdi))
601 goto fail_put;
602
603 dev_set_drvdata(dev, cd);
604 disk->flags |= GENHD_FL_REMOVABLE;
605 add_disk(disk);
606
James Bottomley9ccfc752005-10-02 11:45:08 -0500607 sdev_printk(KERN_DEBUG, sdev,
608 "Attached scsi CD-ROM %s\n", cd->cdi.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 return 0;
610
611fail_put:
612 put_disk(disk);
613fail_free:
614 kfree(cd);
615fail:
616 return error;
617}
618
619
620static void get_sectorsize(struct scsi_cd *cd)
621{
622 unsigned char cmd[10];
623 unsigned char *buffer;
624 int the_result, retries = 3;
625 int sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 request_queue_t *queue;
627
628 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
629 if (!buffer)
630 goto Enomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632 do {
633 cmd[0] = READ_CAPACITY;
634 memset((void *) &cmd[1], 0, 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 memset(buffer, 0, 8);
636
637 /* Do the command and wait.. */
James Bottomley820732b2005-06-12 22:21:29 -0500638 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
639 buffer, 8, NULL, SR_TIMEOUT,
640 MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 retries--;
643
644 } while (the_result && retries);
645
646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (the_result) {
648 cd->capacity = 0x1fffff;
649 sector_size = 2048; /* A guess, just in case */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 } else {
651#if 0
652 if (cdrom_get_last_written(&cd->cdi,
653 &cd->capacity))
654#endif
655 cd->capacity = 1 + ((buffer[0] << 24) |
656 (buffer[1] << 16) |
657 (buffer[2] << 8) |
658 buffer[3]);
659 sector_size = (buffer[4] << 24) |
660 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
661 switch (sector_size) {
662 /*
663 * HP 4020i CD-Recorder reports 2340 byte sectors
664 * Philips CD-Writers report 2352 byte sectors
665 *
666 * Use 2k sectors for them..
667 */
668 case 0:
669 case 2340:
670 case 2352:
671 sector_size = 2048;
672 /* fall through */
673 case 2048:
674 cd->capacity *= 4;
675 /* fall through */
676 case 512:
677 break;
678 default:
679 printk("%s: unsupported sector size %d.\n",
680 cd->cdi.name, sector_size);
681 cd->capacity = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 }
683
684 cd->device->sector_size = sector_size;
685
686 /*
687 * Add this so that we have the ability to correctly gauge
688 * what the device is capable of.
689 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 set_capacity(cd->disk, cd->capacity);
691 }
692
693 queue = cd->device->request_queue;
694 blk_queue_hardsect_size(queue, sector_size);
695out:
696 kfree(buffer);
697 return;
698
699Enomem:
700 cd->capacity = 0x1fffff;
Pete Zaitcev51490c82005-07-05 18:18:08 -0700701 cd->device->sector_size = 2048; /* A guess, just in case */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 goto out;
703}
704
705static void get_capabilities(struct scsi_cd *cd)
706{
707 unsigned char *buffer;
708 struct scsi_mode_data data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 unsigned char cmd[MAX_COMMAND_SIZE];
James Bottomley820732b2005-06-12 22:21:29 -0500710 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 unsigned int the_result;
712 int retries, rc, n;
713
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100714 static const char *loadmech[] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 {
716 "caddy",
717 "tray",
718 "pop-up",
719 "",
720 "changer",
721 "cartridge changer",
722 "",
723 ""
724 };
725
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727 /* allocate transfer buffer */
728 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
729 if (!buffer) {
730 printk(KERN_ERR "sr: out of memory.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 return;
732 }
733
734 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
735 * conditions are gone, or a timeout happens
736 */
737 retries = 0;
738 do {
739 memset((void *)cmd, 0, MAX_COMMAND_SIZE);
740 cmd[0] = TEST_UNIT_READY;
741
James Bottomley820732b2005-06-12 22:21:29 -0500742 the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL,
743 0, &sshdr, SR_TIMEOUT,
744 MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 retries++;
747 } while (retries < 5 &&
748 (!scsi_status_is_good(the_result) ||
James Bottomley820732b2005-06-12 22:21:29 -0500749 (scsi_sense_valid(&sshdr) &&
750 sshdr.sense_key == UNIT_ATTENTION)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
752 /* ask for mode page 0x2a */
753 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
James Bottomley1cf72692005-08-28 11:27:01 -0500754 SR_TIMEOUT, 3, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
756 if (!scsi_status_is_good(rc)) {
757 /* failed, drive doesn't have capabilities mode page */
758 cd->cdi.speed = 1;
759 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
Chuck Ebbertbcc1e382006-01-11 23:58:40 -0500760 CDC_DVD | CDC_DVD_RAM |
761 CDC_SELECT_DISC | CDC_SELECT_SPEED |
762 CDC_MRW | CDC_MRW_W | CDC_RAM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 kfree(buffer);
764 printk("%s: scsi-1 drive\n", cd->cdi.name);
765 return;
766 }
767
768 n = data.header_length + data.block_descriptor_length;
769 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
770 cd->readcd_known = 1;
771 cd->readcd_cdda = buffer[n + 5] & 0x01;
772 /* print some capability bits */
773 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
774 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
775 cd->cdi.speed,
776 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
777 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
778 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
779 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
780 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
781 loadmech[buffer[n + 6] >> 5]);
782 if ((buffer[n + 6] >> 5) == 0)
783 /* caddy drives can't close tray... */
784 cd->cdi.mask |= CDC_CLOSE_TRAY;
785 if ((buffer[n + 2] & 0x8) == 0)
786 /* not a DVD drive */
787 cd->cdi.mask |= CDC_DVD;
788 if ((buffer[n + 3] & 0x20) == 0)
789 /* can't write DVD-RAM media */
790 cd->cdi.mask |= CDC_DVD_RAM;
791 if ((buffer[n + 3] & 0x10) == 0)
792 /* can't write DVD-R media */
793 cd->cdi.mask |= CDC_DVD_R;
794 if ((buffer[n + 3] & 0x2) == 0)
795 /* can't write CD-RW media */
796 cd->cdi.mask |= CDC_CD_RW;
797 if ((buffer[n + 3] & 0x1) == 0)
798 /* can't write CD-R media */
799 cd->cdi.mask |= CDC_CD_R;
800 if ((buffer[n + 6] & 0x8) == 0)
801 /* can't eject */
802 cd->cdi.mask |= CDC_OPEN_TRAY;
803
804 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
805 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
806 cd->cdi.capacity =
807 cdrom_number_of_slots(&cd->cdi);
808 if (cd->cdi.capacity <= 1)
809 /* not a changer */
810 cd->cdi.mask |= CDC_SELECT_DISC;
811 /*else I don't think it can close its tray
812 cd->cdi.mask |= CDC_CLOSE_TRAY; */
813
814 /*
815 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
816 */
817 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
818 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
819 cd->device->writeable = 1;
820 }
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 kfree(buffer);
823}
824
825/*
826 * sr_packet() is the entry point for the generic commands generated
827 * by the Uniform CD-ROM layer.
828 */
829static int sr_packet(struct cdrom_device_info *cdi,
830 struct packet_command *cgc)
831{
832 if (cgc->timeout <= 0)
833 cgc->timeout = IOCTL_TIMEOUT;
834
835 sr_do_ioctl(cdi->handle, cgc);
836
837 return cgc->stat;
838}
839
840/**
841 * sr_kref_release - Called to free the scsi_cd structure
842 * @kref: pointer to embedded kref
843 *
Arjan van de Ven0b950672006-01-11 13:16:10 +0100844 * sr_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 * called on last put, you should always use the scsi_cd_get()
846 * scsi_cd_put() helpers which manipulate the semaphore directly
847 * and never do a direct kref_put().
848 **/
849static void sr_kref_release(struct kref *kref)
850{
851 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
852 struct gendisk *disk = cd->disk;
853
854 spin_lock(&sr_index_lock);
855 clear_bit(disk->first_minor, sr_index_bits);
856 spin_unlock(&sr_index_lock);
857
858 unregister_cdrom(&cd->cdi);
859
860 disk->private_data = NULL;
861
862 put_disk(disk);
863
864 kfree(cd);
865}
866
867static int sr_remove(struct device *dev)
868{
869 struct scsi_cd *cd = dev_get_drvdata(dev);
870
871 del_gendisk(cd->disk);
872
Arjan van de Ven0b950672006-01-11 13:16:10 +0100873 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 kref_put(&cd->kref, sr_kref_release);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100875 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
877 return 0;
878}
879
880static int __init init_sr(void)
881{
882 int rc;
883
884 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
885 if (rc)
886 return rc;
887 return scsi_register_driver(&sr_template.gendrv);
888}
889
890static void __exit exit_sr(void)
891{
892 scsi_unregister_driver(&sr_template.gendrv);
893 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
894}
895
896module_init(init_sr);
897module_exit(exit_sr);
898MODULE_LICENSE("GPL");