xref: /linux/drivers/cdrom/cdrom.c (revision 5a48b7433a5aee719ab242d2feadaf4c9e065989)
1 /* linux/drivers/cdrom/cdrom.c
2    Copyright (c) 1996, 1997 David A. van Leeuwen.
3    Copyright (c) 1997, 1998 Erik Andersen <andersee@debian.org>
4    Copyright (c) 1998, 1999 Jens Axboe <axboe@image.dk>
5 
6    May be copied or modified under the terms of the GNU General Public
7    License.  See linux/COPYING for more information.
8 
9    Uniform CD-ROM driver for Linux.
10    See Documentation/cdrom/cdrom-standard.rst for usage information.
11 
12    The routines in the file provide a uniform interface between the
13    software that uses CD-ROMs and the various low-level drivers that
14    actually talk to the hardware. Suggestions are welcome.
15    Patches that work are more welcome though.  ;-)
16 
17  To Do List:
18  ----------------------------------
19 
20  -- Modify sysctl/proc interface. I plan on having one directory per
21  drive, with entries for outputing general drive information, and sysctl
22  based tunable parameters such as whether the tray should auto-close for
23  that drive. Suggestions (or patches) for this welcome!
24 
25 
26  Revision History
27  ----------------------------------
28  1.00  Date Unknown -- David van Leeuwen <david@tm.tno.nl>
29  -- Initial version by David A. van Leeuwen. I don't have a detailed
30   changelog for the 1.x series, David?
31 
32 2.00  Dec  2, 1997 -- Erik Andersen <andersee@debian.org>
33   -- New maintainer! As David A. van Leeuwen has been too busy to actively
34   maintain and improve this driver, I am now carrying on the torch. If
35   you have a problem with this driver, please feel free to contact me.
36 
37   -- Added (rudimentary) sysctl interface. I realize this is really weak
38   right now, and is _very_ badly implemented. It will be improved...
39 
40   -- Modified CDROM_DISC_STATUS so that it is now incorporated into
41   the Uniform CD-ROM driver via the cdrom_count_tracks function.
42   The cdrom_count_tracks function helps resolve some of the false
43   assumptions of the CDROM_DISC_STATUS ioctl, and is also used to check
44   for the correct media type when mounting or playing audio from a CD.
45 
46   -- Remove the calls to verify_area and only use the copy_from_user and
47   copy_to_user stuff, since these calls now provide their own memory
48   checking with the 2.1.x kernels.
49 
50   -- Major update to return codes so that errors from low-level drivers
51   are passed on through (thanks to Gerd Knorr for pointing out this
52   problem).
53 
54   -- Made it so if a function isn't implemented in a low-level driver,
55   ENOSYS is now returned instead of EINVAL.
56 
57   -- Simplified some complex logic so that the source code is easier to read.
58 
59   -- Other stuff I probably forgot to mention (lots of changes).
60 
61 2.01 to 2.11 Dec 1997-Jan 1998
62   -- TO-DO!  Write changelogs for 2.01 to 2.12.
63 
64 2.12  Jan  24, 1998 -- Erik Andersen <andersee@debian.org>
65   -- Fixed a bug in the IOCTL_IN and IOCTL_OUT macros.  It turns out that
66   copy_*_user does not return EFAULT on error, but instead returns the number
67   of bytes not copied.  I was returning whatever non-zero stuff came back from
68   the copy_*_user functions directly, which would result in strange errors.
69 
70 2.13  July 17, 1998 -- Erik Andersen <andersee@debian.org>
71   -- Fixed a bug in CDROM_SELECT_SPEED where you couldn't lower the speed
72   of the drive.  Thanks to Tobias Ringstr|m <tori@prosolvia.se> for pointing
73   this out and providing a simple fix.
74   -- Fixed the procfs-unload-module bug with the fill_inode procfs callback.
75   thanks to Andrea Arcangeli
76   -- Fixed it so that the /proc entry now also shows up when cdrom is
77   compiled into the kernel.  Before it only worked when loaded as a module.
78 
79   2.14 August 17, 1998 -- Erik Andersen <andersee@debian.org>
80   -- Fixed a bug in cdrom_media_changed and handling of reporting that
81   the media had changed for devices that _don't_ implement media_changed.
82   Thanks to Grant R. Guenther <grant@torque.net> for spotting this bug.
83   -- Made a few things more pedanticly correct.
84 
85 2.50 Oct 19, 1998 - Jens Axboe <axboe@image.dk>
86   -- New maintainers! Erik was too busy to continue the work on the driver,
87   so now Chris Zwilling <chris@cloudnet.com> and Jens Axboe <axboe@image.dk>
88   will do their best to follow in his footsteps
89 
90   2.51 Dec 20, 1998 - Jens Axboe <axboe@image.dk>
91   -- Check if drive is capable of doing what we ask before blindly changing
92   cdi->options in various ioctl.
93   -- Added version to proc entry.
94 
95   2.52 Jan 16, 1999 - Jens Axboe <axboe@image.dk>
96   -- Fixed an error in open_for_data where we would sometimes not return
97   the correct error value. Thanks Huba Gaspar <huba@softcell.hu>.
98   -- Fixed module usage count - usage was based on /proc/sys/dev
99   instead of /proc/sys/dev/cdrom. This could lead to an oops when other
100   modules had entries in dev. Feb 02 - real bug was in sysctl.c where
101   dev would be removed even though it was used. cdrom.c just illuminated
102   that bug.
103 
104   2.53 Feb 22, 1999 - Jens Axboe <axboe@image.dk>
105   -- Fixup of several ioctl calls, in particular CDROM_SET_OPTIONS has
106   been "rewritten" because capabilities and options aren't in sync. They
107   should be...
108   -- Added CDROM_LOCKDOOR ioctl. Locks the door and keeps it that way.
109   -- Added CDROM_RESET ioctl.
110   -- Added CDROM_DEBUG ioctl. Enable debug messages on-the-fly.
111   -- Added CDROM_GET_CAPABILITY ioctl. This relieves userspace programs
112   from parsing /proc/sys/dev/cdrom/info.
113 
114   2.54 Mar 15, 1999 - Jens Axboe <axboe@image.dk>
115   -- Check capability mask from low level driver when counting tracks as
116   per suggestion from Corey J. Scotts <cstotts@blue.weeg.uiowa.edu>.
117 
118   2.55 Apr 25, 1999 - Jens Axboe <axboe@image.dk>
119   -- autoclose was mistakenly checked against CDC_OPEN_TRAY instead of
120   CDC_CLOSE_TRAY.
121   -- proc info didn't mask against capabilities mask.
122 
123   3.00 Aug 5, 1999 - Jens Axboe <axboe@image.dk>
124   -- Unified audio ioctl handling across CD-ROM drivers. A lot of the
125   code was duplicated before. Drives that support the generic packet
126   interface are now being fed packets from here instead.
127   -- First attempt at adding support for MMC2 commands - for DVD and
128   CD-R(W) drives. Only the DVD parts are in now - the interface used is
129   the same as for the audio ioctls.
130   -- ioctl cleanups. if a drive couldn't play audio, it didn't get
131   a change to perform device specific ioctls as well.
132   -- Defined CDROM_CAN(CDC_XXX) for checking the capabilities.
133   -- Put in sysctl files for autoclose, autoeject, check_media, debug,
134   and lock.
135   -- /proc/sys/dev/cdrom/info has been updated to also contain info about
136   CD-Rx and DVD capabilities.
137   -- Now default to checking media type.
138   -- CDROM_SEND_PACKET ioctl added. The infrastructure was in place for
139   doing this anyway, with the generic_packet addition.
140 
141   3.01 Aug 6, 1999 - Jens Axboe <axboe@image.dk>
142   -- Fix up the sysctl handling so that the option flags get set
143   correctly.
144   -- Fix up ioctl handling so the device specific ones actually get
145   called :).
146 
147   3.02 Aug 8, 1999 - Jens Axboe <axboe@image.dk>
148   -- Fixed volume control on SCSI drives (or others with longer audio
149   page).
150   -- Fixed a couple of DVD minors. Thanks to Andrew T. Veliath
151   <andrewtv@usa.net> for telling me and for having defined the various
152   DVD structures and ioctls in the first place! He designed the original
153   DVD patches for ide-cd and while I rearranged and unified them, the
154   interface is still the same.
155 
156   3.03 Sep 1, 1999 - Jens Axboe <axboe@image.dk>
157   -- Moved the rest of the audio ioctls from the CD-ROM drivers here. Only
158   CDROMREADTOCENTRY and CDROMREADTOCHDR are left.
159   -- Moved the CDROMREADxxx ioctls in here.
160   -- Defined the cdrom_get_last_written and cdrom_get_next_block as ioctls
161   and exported functions.
162   -- Erik Andersen <andersen@xmission.com> modified all SCMD_ commands
163   to now read GPCMD_ for the new generic packet interface. All low level
164   drivers are updated as well.
165   -- Various other cleanups.
166 
167   3.04 Sep 12, 1999 - Jens Axboe <axboe@image.dk>
168   -- Fixed a couple of possible memory leaks (if an operation failed and
169   we didn't free the buffer before returning the error).
170   -- Integrated Uniform CD Changer handling from Richard Sharman
171   <rsharman@pobox.com>.
172   -- Defined CD_DVD and CD_CHANGER log levels.
173   -- Fixed the CDROMREADxxx ioctls.
174   -- CDROMPLAYTRKIND uses the GPCMD_PLAY_AUDIO_MSF command - too few
175   drives supported it. We lose the index part, however.
176   -- Small modifications to accommodate opens of /dev/hdc1, required
177   for ide-cd to handle multisession discs.
178   -- Export cdrom_mode_sense and cdrom_mode_select.
179   -- init_cdrom_command() for setting up a cgc command.
180 
181   3.05 Oct 24, 1999 - Jens Axboe <axboe@image.dk>
182   -- Changed the interface for CDROM_SEND_PACKET. Before it was virtually
183   impossible to send the drive data in a sensible way.
184   -- Lowered stack usage in mmc_ioctl(), dvd_read_disckey(), and
185   dvd_read_manufact.
186   -- Added setup of write mode for packet writing.
187   -- Fixed CDDA ripping with cdda2wav - accept much larger requests of
188   number of frames and split the reads in blocks of 8.
189 
190   3.06 Dec 13, 1999 - Jens Axboe <axboe@image.dk>
191   -- Added support for changing the region of DVD drives.
192   -- Added sense data to generic command.
193 
194   3.07 Feb 2, 2000 - Jens Axboe <axboe@suse.de>
195   -- Do same "read header length" trick in cdrom_get_disc_info() as
196   we do in cdrom_get_track_info() -- some drive don't obey specs and
197   fail if they can't supply the full Mt Fuji size table.
198   -- Deleted stuff related to setting up write modes. It has a different
199   home now.
200   -- Clear header length in mode_select unconditionally.
201   -- Removed the register_disk() that was added, not needed here.
202 
203   3.08 May 1, 2000 - Jens Axboe <axboe@suse.de>
204   -- Fix direction flag in setup_send_key and setup_report_key. This
205   gave some SCSI adapters problems.
206   -- Always return -EROFS for write opens
207   -- Convert to module_init/module_exit style init and remove some
208   of the #ifdef MODULE stuff
209   -- Fix several dvd errors - DVD_LU_SEND_ASF should pass agid,
210   DVD_HOST_SEND_RPC_STATE did not set buffer size in cdb, and
211   dvd_do_auth passed uninitialized data to drive because init_cdrom_command
212   did not clear a 0 sized buffer.
213 
214   3.09 May 12, 2000 - Jens Axboe <axboe@suse.de>
215   -- Fix Video-CD on SCSI drives that don't support READ_CD command. In
216   that case switch block size and issue plain READ_10 again, then switch
217   back.
218 
219   3.10 Jun 10, 2000 - Jens Axboe <axboe@suse.de>
220   -- Fix volume control on CD's - old SCSI-II drives now use their own
221   code, as doing MODE6 stuff in here is really not my intention.
222   -- Use READ_DISC_INFO for more reliable end-of-disc.
223 
224   3.11 Jun 12, 2000 - Jens Axboe <axboe@suse.de>
225   -- Fix bug in getting rpc phase 2 region info.
226   -- Reinstate "correct" CDROMPLAYTRKIND
227 
228    3.12 Oct 18, 2000 - Jens Axboe <axboe@suse.de>
229   -- Use quiet bit on packet commands not known to work
230 
231    3.20 Dec 17, 2003 - Jens Axboe <axboe@suse.de>
232   -- Various fixes and lots of cleanups not listed :-)
233   -- Locking fixes
234   -- Mt Rainier support
235   -- DVD-RAM write open fixes
236 
237   Nov 5 2001, Aug 8 2002. Modified by Andy Polyakov
238   <appro@fy.chalmers.se> to support MMC-3 compliant DVD+RW units.
239 
240   Modified by Nigel Kukard <nkukard@lbsd.net> - support DVD+RW
241   2.4.x patch by Andy Polyakov <appro@fy.chalmers.se>
242 
243 -------------------------------------------------------------------------*/
244 
245 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
246 
247 #define REVISION "Revision: 3.20"
248 #define VERSION "Id: cdrom.c 3.20 2003/12/17"
249 
250 /* I use an error-log mask to give fine grain control over the type of
251    messages dumped to the system logs.  The available masks include: */
252 #define CD_NOTHING      0x0
253 #define CD_WARNING	0x1
254 #define CD_REG_UNREG	0x2
255 #define CD_DO_IOCTL	0x4
256 #define CD_OPEN		0x8
257 #define CD_CLOSE	0x10
258 #define CD_COUNT_TRACKS 0x20
259 #define CD_CHANGER	0x40
260 #define CD_DVD		0x80
261 
262 /* Define this to remove _all_ the debugging messages */
263 /* #define ERRLOGMASK CD_NOTHING */
264 #define ERRLOGMASK CD_WARNING
265 /* #define ERRLOGMASK (CD_WARNING|CD_OPEN|CD_COUNT_TRACKS|CD_CLOSE) */
266 /* #define ERRLOGMASK (CD_WARNING|CD_REG_UNREG|CD_DO_IOCTL|CD_OPEN|CD_CLOSE|CD_COUNT_TRACKS) */
267 
268 #include <linux/atomic.h>
269 #include <linux/module.h>
270 #include <linux/fs.h>
271 #include <linux/major.h>
272 #include <linux/types.h>
273 #include <linux/errno.h>
274 #include <linux/kernel.h>
275 #include <linux/mm.h>
276 #include <linux/slab.h>
277 #include <linux/cdrom.h>
278 #include <linux/sysctl.h>
279 #include <linux/proc_fs.h>
280 #include <linux/blkpg.h>
281 #include <linux/init.h>
282 #include <linux/fcntl.h>
283 #include <linux/blkdev.h>
284 #include <linux/times.h>
285 #include <linux/uaccess.h>
286 #include <scsi/scsi_common.h>
287 
288 /* used to tell the module to turn on full debugging messages */
289 static bool debug;
290 /* default compatibility mode */
291 static bool autoclose=1;
292 static bool autoeject;
293 static bool lockdoor = 1;
294 /* will we ever get to use this... sigh. */
295 static bool check_media_type;
296 /* automatically restart mrw format */
297 static bool mrw_format_restart = 1;
298 module_param(debug, bool, 0);
299 module_param(autoclose, bool, 0);
300 module_param(autoeject, bool, 0);
301 module_param(lockdoor, bool, 0);
302 module_param(check_media_type, bool, 0);
303 module_param(mrw_format_restart, bool, 0);
304 
305 static DEFINE_MUTEX(cdrom_mutex);
306 
307 static const char *mrw_format_status[] = {
308 	"not mrw",
309 	"bgformat inactive",
310 	"bgformat active",
311 	"mrw complete",
312 };
313 
314 static const char *mrw_address_space[] = { "DMA", "GAA" };
315 
316 #if (ERRLOGMASK != CD_NOTHING)
317 #define cd_dbg(type, fmt, ...)				\
318 do {							\
319 	if ((ERRLOGMASK & type) || debug == 1)		\
320 		pr_debug(fmt, ##__VA_ARGS__);		\
321 } while (0)
322 #else
323 #define cd_dbg(type, fmt, ...)				\
324 do {							\
325 	if (0 && (ERRLOGMASK & type) || debug == 1)	\
326 		pr_debug(fmt, ##__VA_ARGS__);		\
327 } while (0)
328 #endif
329 
330 /* The (cdo->capability & ~cdi->mask & CDC_XXX) construct was used in
331    a lot of places. This macro makes the code more clear. */
332 #define CDROM_CAN(type) (cdi->ops->capability & ~cdi->mask & (type))
333 
334 /*
335  * Another popular OS uses 7 seconds as the hard timeout for default
336  * commands, so it is a good choice for us as well.
337  */
338 #define CDROM_DEF_TIMEOUT	(7 * HZ)
339 
340 /* Not-exported routines. */
341 
342 static void cdrom_sysctl_register(void);
343 
344 static LIST_HEAD(cdrom_list);
345 
346 static void signal_media_change(struct cdrom_device_info *cdi)
347 {
348 	cdi->mc_flags = 0x3; /* set media changed bits, on both queues */
349 	cdi->last_media_change_ms = ktime_to_ms(ktime_get());
350 }
351 
352 int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
353 			       struct packet_command *cgc)
354 {
355 	if (cgc->sshdr) {
356 		cgc->sshdr->sense_key = 0x05;
357 		cgc->sshdr->asc = 0x20;
358 		cgc->sshdr->ascq = 0x00;
359 	}
360 
361 	cgc->stat = -EIO;
362 	return -EIO;
363 }
364 EXPORT_SYMBOL(cdrom_dummy_generic_packet);
365 
366 static int cdrom_flush_cache(struct cdrom_device_info *cdi)
367 {
368 	struct packet_command cgc;
369 
370 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
371 	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
372 
373 	cgc.timeout = 5 * 60 * HZ;
374 
375 	return cdi->ops->generic_packet(cdi, &cgc);
376 }
377 
378 /* requires CD R/RW */
379 static int cdrom_get_disc_info(struct cdrom_device_info *cdi,
380 			       disc_information *di)
381 {
382 	const struct cdrom_device_ops *cdo = cdi->ops;
383 	struct packet_command cgc;
384 	int ret, buflen;
385 
386 	/* set up command and get the disc info */
387 	init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
388 	cgc.cmd[0] = GPCMD_READ_DISC_INFO;
389 	cgc.cmd[8] = cgc.buflen = 2;
390 	cgc.quiet = 1;
391 
392 	ret = cdo->generic_packet(cdi, &cgc);
393 	if (ret)
394 		return ret;
395 
396 	/* not all drives have the same disc_info length, so requeue
397 	 * packet with the length the drive tells us it can supply
398 	 */
399 	buflen = be16_to_cpu(di->disc_information_length) +
400 		sizeof(di->disc_information_length);
401 
402 	if (buflen > sizeof(disc_information))
403 		buflen = sizeof(disc_information);
404 
405 	cgc.cmd[8] = cgc.buflen = buflen;
406 	ret = cdo->generic_packet(cdi, &cgc);
407 	if (ret)
408 		return ret;
409 
410 	/* return actual fill size */
411 	return buflen;
412 }
413 
414 /* This macro makes sure we don't have to check on cdrom_device_ops
415  * existence in the run-time routines below. Change_capability is a
416  * hack to have the capability flags defined const, while we can still
417  * change it here without gcc complaining at every line.
418  */
419 #define ENSURE(cdo, call, bits)					\
420 do {								\
421 	if (cdo->call == NULL)					\
422 		WARN_ON_ONCE((cdo)->capability & (bits));	\
423 } while (0)
424 
425 /*
426  * the first prototypes used 0x2c as the page code for the mrw mode page,
427  * subsequently this was changed to 0x03. probe the one used by this drive
428  */
429 static int cdrom_mrw_probe_pc(struct cdrom_device_info *cdi)
430 {
431 	struct packet_command cgc;
432 	char buffer[16];
433 
434 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
435 
436 	cgc.timeout = HZ;
437 	cgc.quiet = 1;
438 
439 	if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC, 0)) {
440 		cdi->mrw_mode_page = MRW_MODE_PC;
441 		return 0;
442 	} else if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC_PRE1, 0)) {
443 		cdi->mrw_mode_page = MRW_MODE_PC_PRE1;
444 		return 0;
445 	}
446 
447 	return 1;
448 }
449 
450 static int cdrom_is_mrw(struct cdrom_device_info *cdi, int *write)
451 {
452 	struct packet_command cgc;
453 	struct mrw_feature_desc *mfd;
454 	unsigned char buffer[16];
455 	int ret;
456 
457 	*write = 0;
458 
459 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
460 
461 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
462 	cgc.cmd[3] = CDF_MRW;
463 	cgc.cmd[8] = sizeof(buffer);
464 	cgc.quiet = 1;
465 
466 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
467 		return ret;
468 
469 	mfd = (struct mrw_feature_desc *)&buffer[sizeof(struct feature_header)];
470 	if (be16_to_cpu(mfd->feature_code) != CDF_MRW)
471 		return 1;
472 	*write = mfd->write;
473 
474 	if ((ret = cdrom_mrw_probe_pc(cdi))) {
475 		*write = 0;
476 		return ret;
477 	}
478 
479 	return 0;
480 }
481 
482 static int cdrom_mrw_bgformat(struct cdrom_device_info *cdi, int cont)
483 {
484 	struct packet_command cgc;
485 	unsigned char buffer[12];
486 	int ret;
487 
488 	pr_info("%sstarting format\n", cont ? "Re" : "");
489 
490 	/*
491 	 * FmtData bit set (bit 4), format type is 1
492 	 */
493 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_WRITE);
494 	cgc.cmd[0] = GPCMD_FORMAT_UNIT;
495 	cgc.cmd[1] = (1 << 4) | 1;
496 
497 	cgc.timeout = 5 * 60 * HZ;
498 
499 	/*
500 	 * 4 byte format list header, 8 byte format list descriptor
501 	 */
502 	buffer[1] = 1 << 1;
503 	buffer[3] = 8;
504 
505 	/*
506 	 * nr_blocks field
507 	 */
508 	buffer[4] = 0xff;
509 	buffer[5] = 0xff;
510 	buffer[6] = 0xff;
511 	buffer[7] = 0xff;
512 
513 	buffer[8] = 0x24 << 2;
514 	buffer[11] = cont;
515 
516 	ret = cdi->ops->generic_packet(cdi, &cgc);
517 	if (ret)
518 		pr_info("bgformat failed\n");
519 
520 	return ret;
521 }
522 
523 static int cdrom_mrw_bgformat_susp(struct cdrom_device_info *cdi, int immed)
524 {
525 	struct packet_command cgc;
526 
527 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
528 	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
529 
530 	/*
531 	 * Session = 1, Track = 0
532 	 */
533 	cgc.cmd[1] = !!immed;
534 	cgc.cmd[2] = 1 << 1;
535 
536 	cgc.timeout = 5 * 60 * HZ;
537 
538 	return cdi->ops->generic_packet(cdi, &cgc);
539 }
540 
541 static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
542 {
543 	disc_information di;
544 	int ret;
545 
546 	ret = cdrom_get_disc_info(cdi, &di);
547 	if (ret < 0 || ret < (int)offsetof(typeof(di),disc_type))
548 		return 1;
549 
550 	ret = 0;
551 	if (di.mrw_status == CDM_MRW_BGFORMAT_ACTIVE) {
552 		pr_info("issuing MRW background format suspend\n");
553 		ret = cdrom_mrw_bgformat_susp(cdi, 0);
554 	}
555 
556 	if (!ret && cdi->media_written)
557 		ret = cdrom_flush_cache(cdi);
558 
559 	return ret;
560 }
561 
562 static int cdrom_mrw_set_lba_space(struct cdrom_device_info *cdi, int space)
563 {
564 	struct packet_command cgc;
565 	struct mode_page_header *mph;
566 	char buffer[16];
567 	int ret, offset, size;
568 
569 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
570 
571 	cgc.buffer = buffer;
572 	cgc.buflen = sizeof(buffer);
573 
574 	ret = cdrom_mode_sense(cdi, &cgc, cdi->mrw_mode_page, 0);
575 	if (ret)
576 		return ret;
577 
578 	mph = (struct mode_page_header *)buffer;
579 	offset = be16_to_cpu(mph->desc_length);
580 	size = be16_to_cpu(mph->mode_data_length) + 2;
581 
582 	buffer[offset + 3] = space;
583 	cgc.buflen = size;
584 
585 	ret = cdrom_mode_select(cdi, &cgc);
586 	if (ret)
587 		return ret;
588 
589 	pr_info("%s: mrw address space %s selected\n",
590 		cdi->name, mrw_address_space[space]);
591 	return 0;
592 }
593 
594 int register_cdrom(struct gendisk *disk, struct cdrom_device_info *cdi)
595 {
596 	static char banner_printed;
597 	const struct cdrom_device_ops *cdo = cdi->ops;
598 
599 	cd_dbg(CD_OPEN, "entering register_cdrom\n");
600 
601 	if (cdo->open == NULL || cdo->release == NULL)
602 		return -EINVAL;
603 	if (!banner_printed) {
604 		pr_info("Uniform CD-ROM driver " REVISION "\n");
605 		banner_printed = 1;
606 		cdrom_sysctl_register();
607 	}
608 
609 	cdi->disk = disk;
610 	disk->cdi = cdi;
611 
612 	ENSURE(cdo, drive_status, CDC_DRIVE_STATUS);
613 	if (cdo->check_events == NULL)
614 		WARN_ON_ONCE(cdo->capability & (CDC_MEDIA_CHANGED | CDC_SELECT_DISC));
615 	ENSURE(cdo, tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
616 	ENSURE(cdo, lock_door, CDC_LOCK);
617 	ENSURE(cdo, select_speed, CDC_SELECT_SPEED);
618 	ENSURE(cdo, get_last_session, CDC_MULTI_SESSION);
619 	ENSURE(cdo, get_mcn, CDC_MCN);
620 	ENSURE(cdo, reset, CDC_RESET);
621 	ENSURE(cdo, generic_packet, CDC_GENERIC_PACKET);
622 	cdi->mc_flags = 0;
623 	cdi->options = CDO_USE_FFLAGS;
624 	cdi->last_media_change_ms = ktime_to_ms(ktime_get());
625 
626 	if (autoclose == 1 && CDROM_CAN(CDC_CLOSE_TRAY))
627 		cdi->options |= (int) CDO_AUTO_CLOSE;
628 	if (autoeject == 1 && CDROM_CAN(CDC_OPEN_TRAY))
629 		cdi->options |= (int) CDO_AUTO_EJECT;
630 	if (lockdoor == 1)
631 		cdi->options |= (int) CDO_LOCK;
632 	if (check_media_type == 1)
633 		cdi->options |= (int) CDO_CHECK_TYPE;
634 
635 	if (CDROM_CAN(CDC_MRW_W))
636 		cdi->exit = cdrom_mrw_exit;
637 
638 	if (cdi->ops->read_cdda_bpc)
639 		cdi->cdda_method = CDDA_BPC_FULL;
640 	else
641 		cdi->cdda_method = CDDA_OLD;
642 
643 	WARN_ON(!cdo->generic_packet);
644 
645 	cd_dbg(CD_REG_UNREG, "drive \"/dev/%s\" registered\n", cdi->name);
646 	mutex_lock(&cdrom_mutex);
647 	list_add(&cdi->list, &cdrom_list);
648 	mutex_unlock(&cdrom_mutex);
649 	return 0;
650 }
651 #undef ENSURE
652 
653 void unregister_cdrom(struct cdrom_device_info *cdi)
654 {
655 	cd_dbg(CD_OPEN, "entering unregister_cdrom\n");
656 
657 	mutex_lock(&cdrom_mutex);
658 	list_del(&cdi->list);
659 	mutex_unlock(&cdrom_mutex);
660 
661 	if (cdi->exit)
662 		cdi->exit(cdi);
663 
664 	cd_dbg(CD_REG_UNREG, "drive \"/dev/%s\" unregistered\n", cdi->name);
665 }
666 
667 int cdrom_get_media_event(struct cdrom_device_info *cdi,
668 			  struct media_event_desc *med)
669 {
670 	struct packet_command cgc;
671 	unsigned char buffer[8];
672 	struct event_header *eh = (struct event_header *)buffer;
673 
674 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
675 	cgc.cmd[0] = GPCMD_GET_EVENT_STATUS_NOTIFICATION;
676 	cgc.cmd[1] = 1;		/* IMMED */
677 	cgc.cmd[4] = 1 << 4;	/* media event */
678 	cgc.cmd[8] = sizeof(buffer);
679 	cgc.quiet = 1;
680 
681 	if (cdi->ops->generic_packet(cdi, &cgc))
682 		return 1;
683 
684 	if (be16_to_cpu(eh->data_len) < sizeof(*med))
685 		return 1;
686 
687 	if (eh->nea || eh->notification_class != 0x4)
688 		return 1;
689 
690 	memcpy(med, &buffer[sizeof(*eh)], sizeof(*med));
691 	return 0;
692 }
693 
694 static int cdrom_get_random_writable(struct cdrom_device_info *cdi,
695 			      struct rwrt_feature_desc *rfd)
696 {
697 	struct packet_command cgc;
698 	char buffer[24];
699 	int ret;
700 
701 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
702 
703 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;	/* often 0x46 */
704 	cgc.cmd[3] = CDF_RWRT;			/* often 0x0020 */
705 	cgc.cmd[8] = sizeof(buffer);		/* often 0x18 */
706 	cgc.quiet = 1;
707 
708 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
709 		return ret;
710 
711 	memcpy(rfd, &buffer[sizeof(struct feature_header)], sizeof (*rfd));
712 	return 0;
713 }
714 
715 static int cdrom_has_defect_mgt(struct cdrom_device_info *cdi)
716 {
717 	struct packet_command cgc;
718 	char buffer[16];
719 	__be16 *feature_code;
720 	int ret;
721 
722 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
723 
724 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
725 	cgc.cmd[3] = CDF_HWDM;
726 	cgc.cmd[8] = sizeof(buffer);
727 	cgc.quiet = 1;
728 
729 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
730 		return ret;
731 
732 	feature_code = (__be16 *) &buffer[sizeof(struct feature_header)];
733 	if (be16_to_cpu(*feature_code) == CDF_HWDM)
734 		return 0;
735 
736 	return 1;
737 }
738 
739 
740 static int cdrom_is_random_writable(struct cdrom_device_info *cdi, int *write)
741 {
742 	struct rwrt_feature_desc rfd;
743 	int ret;
744 
745 	*write = 0;
746 
747 	if ((ret = cdrom_get_random_writable(cdi, &rfd)))
748 		return ret;
749 
750 	if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
751 		*write = 1;
752 
753 	return 0;
754 }
755 
756 static int cdrom_media_erasable(struct cdrom_device_info *cdi)
757 {
758 	disc_information di;
759 	int ret;
760 
761 	ret = cdrom_get_disc_info(cdi, &di);
762 	if (ret < 0 || ret < offsetof(typeof(di), n_first_track))
763 		return -1;
764 
765 	return di.erasable;
766 }
767 
768 /*
769  * FIXME: check RO bit
770  */
771 static int cdrom_dvdram_open_write(struct cdrom_device_info *cdi)
772 {
773 	int ret = cdrom_media_erasable(cdi);
774 
775 	/*
776 	 * allow writable open if media info read worked and media is
777 	 * erasable, _or_ if it fails since not all drives support it
778 	 */
779 	if (!ret)
780 		return 1;
781 
782 	return 0;
783 }
784 
785 static int cdrom_mrw_open_write(struct cdrom_device_info *cdi)
786 {
787 	disc_information di;
788 	int ret;
789 
790 	/*
791 	 * always reset to DMA lba space on open
792 	 */
793 	if (cdrom_mrw_set_lba_space(cdi, MRW_LBA_DMA)) {
794 		pr_err("failed setting lba address space\n");
795 		return 1;
796 	}
797 
798 	ret = cdrom_get_disc_info(cdi, &di);
799 	if (ret < 0 || ret < offsetof(typeof(di),disc_type))
800 		return 1;
801 
802 	if (!di.erasable)
803 		return 1;
804 
805 	/*
806 	 * mrw_status
807 	 * 0	-	not MRW formatted
808 	 * 1	-	MRW bgformat started, but not running or complete
809 	 * 2	-	MRW bgformat in progress
810 	 * 3	-	MRW formatting complete
811 	 */
812 	ret = 0;
813 	pr_info("open: mrw_status '%s'\n", mrw_format_status[di.mrw_status]);
814 	if (!di.mrw_status)
815 		ret = 1;
816 	else if (di.mrw_status == CDM_MRW_BGFORMAT_INACTIVE &&
817 			mrw_format_restart)
818 		ret = cdrom_mrw_bgformat(cdi, 1);
819 
820 	return ret;
821 }
822 
823 static int mo_open_write(struct cdrom_device_info *cdi)
824 {
825 	struct packet_command cgc;
826 	char buffer[255];
827 	int ret;
828 
829 	init_cdrom_command(&cgc, &buffer, 4, CGC_DATA_READ);
830 	cgc.quiet = 1;
831 
832 	/*
833 	 * obtain write protect information as per
834 	 * drivers/scsi/sd.c:sd_read_write_protect_flag
835 	 */
836 
837 	ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
838 	if (ret)
839 		ret = cdrom_mode_sense(cdi, &cgc, GPMODE_VENDOR_PAGE, 0);
840 	if (ret) {
841 		cgc.buflen = 255;
842 		ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
843 	}
844 
845 	/* drive gave us no info, let the user go ahead */
846 	if (ret)
847 		return 0;
848 
849 	return buffer[3] & 0x80;
850 }
851 
852 static int cdrom_ram_open_write(struct cdrom_device_info *cdi)
853 {
854 	struct rwrt_feature_desc rfd;
855 	int ret;
856 
857 	if ((ret = cdrom_has_defect_mgt(cdi)))
858 		return ret;
859 
860 	if ((ret = cdrom_get_random_writable(cdi, &rfd)))
861 		return ret;
862 	else if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
863 		ret = !rfd.curr;
864 
865 	cd_dbg(CD_OPEN, "can open for random write\n");
866 	return ret;
867 }
868 
869 static void cdrom_mmc3_profile(struct cdrom_device_info *cdi)
870 {
871 	struct packet_command cgc;
872 	char buffer[32];
873 	int mmc3_profile;
874 
875 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
876 
877 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
878 	cgc.cmd[1] = 0;
879 	cgc.cmd[2] = cgc.cmd[3] = 0;		/* Starting Feature Number */
880 	cgc.cmd[8] = sizeof(buffer);		/* Allocation Length */
881 	cgc.quiet = 1;
882 
883 	if (cdi->ops->generic_packet(cdi, &cgc))
884 		mmc3_profile = 0xffff;
885 	else
886 		mmc3_profile = (buffer[6] << 8) | buffer[7];
887 
888 	cdi->mmc3_profile = mmc3_profile;
889 }
890 
891 static int cdrom_is_dvd_rw(struct cdrom_device_info *cdi)
892 {
893 	switch (cdi->mmc3_profile) {
894 	case 0x12:	/* DVD-RAM	*/
895 	case 0x1A:	/* DVD+RW	*/
896 	case 0x43:	/* BD-RE	*/
897 		return 0;
898 	default:
899 		return 1;
900 	}
901 }
902 
903 /*
904  * returns 0 for ok to open write, non-0 to disallow
905  */
906 static int cdrom_open_write(struct cdrom_device_info *cdi)
907 {
908 	int mrw, mrw_write, ram_write;
909 	int ret = 1;
910 
911 	mrw = 0;
912 	if (!cdrom_is_mrw(cdi, &mrw_write))
913 		mrw = 1;
914 
915 	if (CDROM_CAN(CDC_MO_DRIVE))
916 		ram_write = 1;
917 	else
918 		(void) cdrom_is_random_writable(cdi, &ram_write);
919 
920 	if (mrw)
921 		cdi->mask &= ~CDC_MRW;
922 	else
923 		cdi->mask |= CDC_MRW;
924 
925 	if (mrw_write)
926 		cdi->mask &= ~CDC_MRW_W;
927 	else
928 		cdi->mask |= CDC_MRW_W;
929 
930 	if (ram_write)
931 		cdi->mask &= ~CDC_RAM;
932 	else
933 		cdi->mask |= CDC_RAM;
934 
935 	if (CDROM_CAN(CDC_MRW_W))
936 		ret = cdrom_mrw_open_write(cdi);
937 	else if (CDROM_CAN(CDC_DVD_RAM))
938 		ret = cdrom_dvdram_open_write(cdi);
939  	else if (CDROM_CAN(CDC_RAM) &&
940  		 !CDROM_CAN(CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_MRW|CDC_MO_DRIVE))
941  		ret = cdrom_ram_open_write(cdi);
942 	else if (CDROM_CAN(CDC_MO_DRIVE))
943 		ret = mo_open_write(cdi);
944 	else if (!cdrom_is_dvd_rw(cdi))
945 		ret = 0;
946 
947 	return ret;
948 }
949 
950 static void cdrom_dvd_rw_close_write(struct cdrom_device_info *cdi)
951 {
952 	struct packet_command cgc;
953 
954 	if (cdi->mmc3_profile != 0x1a) {
955 		cd_dbg(CD_CLOSE, "%s: No DVD+RW\n", cdi->name);
956 		return;
957 	}
958 
959 	if (!cdi->media_written) {
960 		cd_dbg(CD_CLOSE, "%s: DVD+RW media clean\n", cdi->name);
961 		return;
962 	}
963 
964 	pr_info("%s: dirty DVD+RW media, \"finalizing\"\n", cdi->name);
965 
966 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
967 	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
968 	cgc.timeout = 30*HZ;
969 	cdi->ops->generic_packet(cdi, &cgc);
970 
971 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
972 	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
973 	cgc.timeout = 3000*HZ;
974 	cgc.quiet = 1;
975 	cdi->ops->generic_packet(cdi, &cgc);
976 
977 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
978 	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
979 	cgc.cmd[2] = 2;	 /* Close session */
980 	cgc.quiet = 1;
981 	cgc.timeout = 3000*HZ;
982 	cdi->ops->generic_packet(cdi, &cgc);
983 
984 	cdi->media_written = 0;
985 }
986 
987 static int cdrom_close_write(struct cdrom_device_info *cdi)
988 {
989 #if 0
990 	return cdrom_flush_cache(cdi);
991 #else
992 	return 0;
993 #endif
994 }
995 
996 /* badly broken, I know. Is due for a fixup anytime. */
997 static void cdrom_count_tracks(struct cdrom_device_info *cdi, tracktype *tracks)
998 {
999 	struct cdrom_tochdr header;
1000 	struct cdrom_tocentry entry;
1001 	int ret, i;
1002 	tracks->data = 0;
1003 	tracks->audio = 0;
1004 	tracks->cdi = 0;
1005 	tracks->xa = 0;
1006 	tracks->error = 0;
1007 	cd_dbg(CD_COUNT_TRACKS, "entering cdrom_count_tracks\n");
1008 
1009 	if (!CDROM_CAN(CDC_PLAY_AUDIO)) {
1010 		tracks->error = CDS_NO_INFO;
1011 		return;
1012 	}
1013 
1014 	/* Grab the TOC header so we can see how many tracks there are */
1015 	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header);
1016 	if (ret) {
1017 		if (ret == -ENOMEDIUM)
1018 			tracks->error = CDS_NO_DISC;
1019 		else
1020 			tracks->error = CDS_NO_INFO;
1021 		return;
1022 	}
1023 	/* check what type of tracks are on this disc */
1024 	entry.cdte_format = CDROM_MSF;
1025 	for (i = header.cdth_trk0; i <= header.cdth_trk1; i++) {
1026 		entry.cdte_track = i;
1027 		if (cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry)) {
1028 			tracks->error = CDS_NO_INFO;
1029 			return;
1030 		}
1031 		if (entry.cdte_ctrl & CDROM_DATA_TRACK) {
1032 			if (entry.cdte_format == 0x10)
1033 				tracks->cdi++;
1034 			else if (entry.cdte_format == 0x20)
1035 				tracks->xa++;
1036 			else
1037 				tracks->data++;
1038 		} else {
1039 			tracks->audio++;
1040 		}
1041 		cd_dbg(CD_COUNT_TRACKS, "track %d: format=%d, ctrl=%d\n",
1042 		       i, entry.cdte_format, entry.cdte_ctrl);
1043 	}
1044 	cd_dbg(CD_COUNT_TRACKS, "disc has %d tracks: %d=audio %d=data %d=Cd-I %d=XA\n",
1045 	       header.cdth_trk1, tracks->audio, tracks->data,
1046 	       tracks->cdi, tracks->xa);
1047 }
1048 
1049 static
1050 int open_for_data(struct cdrom_device_info *cdi)
1051 {
1052 	int ret;
1053 	const struct cdrom_device_ops *cdo = cdi->ops;
1054 	tracktype tracks;
1055 	cd_dbg(CD_OPEN, "entering open_for_data\n");
1056 	/* Check if the driver can report drive status.  If it can, we
1057 	   can do clever things.  If it can't, well, we at least tried! */
1058 	if (cdo->drive_status != NULL) {
1059 		ret = cdo->drive_status(cdi, CDSL_CURRENT);
1060 		cd_dbg(CD_OPEN, "drive_status=%d\n", ret);
1061 		if (ret == CDS_TRAY_OPEN) {
1062 			cd_dbg(CD_OPEN, "the tray is open...\n");
1063 			/* can/may i close it? */
1064 			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
1065 			    cdi->options & CDO_AUTO_CLOSE) {
1066 				cd_dbg(CD_OPEN, "trying to close the tray\n");
1067 				ret=cdo->tray_move(cdi,0);
1068 				if (ret) {
1069 					cd_dbg(CD_OPEN, "bummer. tried to close the tray but failed.\n");
1070 					/* Ignore the error from the low
1071 					level driver.  We don't care why it
1072 					couldn't close the tray.  We only care
1073 					that there is no disc in the drive,
1074 					since that is the _REAL_ problem here.*/
1075 					ret=-ENOMEDIUM;
1076 					goto clean_up_and_return;
1077 				}
1078 			} else {
1079 				cd_dbg(CD_OPEN, "bummer. this drive can't close the tray.\n");
1080 				ret=-ENOMEDIUM;
1081 				goto clean_up_and_return;
1082 			}
1083 			/* Ok, the door should be closed now.. Check again */
1084 			ret = cdo->drive_status(cdi, CDSL_CURRENT);
1085 			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
1086 				cd_dbg(CD_OPEN, "bummer. the tray is still not closed.\n");
1087 				cd_dbg(CD_OPEN, "tray might not contain a medium\n");
1088 				ret=-ENOMEDIUM;
1089 				goto clean_up_and_return;
1090 			}
1091 			cd_dbg(CD_OPEN, "the tray is now closed\n");
1092 		}
1093 		/* the door should be closed now, check for the disc */
1094 		ret = cdo->drive_status(cdi, CDSL_CURRENT);
1095 		if (ret!=CDS_DISC_OK) {
1096 			ret = -ENOMEDIUM;
1097 			goto clean_up_and_return;
1098 		}
1099 	}
1100 	cdrom_count_tracks(cdi, &tracks);
1101 	if (tracks.error == CDS_NO_DISC) {
1102 		cd_dbg(CD_OPEN, "bummer. no disc.\n");
1103 		ret=-ENOMEDIUM;
1104 		goto clean_up_and_return;
1105 	}
1106 	/* CD-Players which don't use O_NONBLOCK, workman
1107 	 * for example, need bit CDO_CHECK_TYPE cleared! */
1108 	if (tracks.data==0) {
1109 		if (cdi->options & CDO_CHECK_TYPE) {
1110 		    /* give people a warning shot, now that CDO_CHECK_TYPE
1111 		       is the default case! */
1112 		    cd_dbg(CD_OPEN, "bummer. wrong media type.\n");
1113 		    cd_dbg(CD_WARNING, "pid %d must open device O_NONBLOCK!\n",
1114 			   (unsigned int)task_pid_nr(current));
1115 		    ret=-EMEDIUMTYPE;
1116 		    goto clean_up_and_return;
1117 		}
1118 		else {
1119 		    cd_dbg(CD_OPEN, "wrong media type, but CDO_CHECK_TYPE not set\n");
1120 		}
1121 	}
1122 
1123 	cd_dbg(CD_OPEN, "all seems well, opening the devicen");
1124 
1125 	/* all seems well, we can open the device */
1126 	ret = cdo->open(cdi, 0); /* open for data */
1127 	cd_dbg(CD_OPEN, "opening the device gave me %d\n", ret);
1128 	/* After all this careful checking, we shouldn't have problems
1129 	   opening the device, but we don't want the device locked if
1130 	   this somehow fails... */
1131 	if (ret) {
1132 		cd_dbg(CD_OPEN, "open device failed\n");
1133 		goto clean_up_and_return;
1134 	}
1135 	if (CDROM_CAN(CDC_LOCK) && (cdi->options & CDO_LOCK)) {
1136 			cdo->lock_door(cdi, 1);
1137 			cd_dbg(CD_OPEN, "door locked\n");
1138 	}
1139 	cd_dbg(CD_OPEN, "device opened successfully\n");
1140 	return ret;
1141 
1142 	/* Something failed.  Try to unlock the drive, because some drivers
1143 	(notably ide-cd) lock the drive after every command.  This produced
1144 	a nasty bug where after mount failed, the drive would remain locked!
1145 	This ensures that the drive gets unlocked after a mount fails.  This
1146 	is a goto to avoid bloating the driver with redundant code. */
1147 clean_up_and_return:
1148 	cd_dbg(CD_OPEN, "open failed\n");
1149 	if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
1150 			cdo->lock_door(cdi, 0);
1151 			cd_dbg(CD_OPEN, "door unlocked\n");
1152 	}
1153 	return ret;
1154 }
1155 
1156 /* We use the open-option O_NONBLOCK to indicate that the
1157  * purpose of opening is only for subsequent ioctl() calls; no device
1158  * integrity checks are performed.
1159  *
1160  * We hope that all cd-player programs will adopt this convention. It
1161  * is in their own interest: device control becomes a lot easier
1162  * this way.
1163  */
1164 int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
1165 	       fmode_t mode)
1166 {
1167 	int ret;
1168 
1169 	cd_dbg(CD_OPEN, "entering cdrom_open\n");
1170 
1171 	/* if this was a O_NONBLOCK open and we should honor the flags,
1172 	 * do a quick open without drive/disc integrity checks. */
1173 	cdi->use_count++;
1174 	if ((mode & FMODE_NDELAY) && (cdi->options & CDO_USE_FFLAGS)) {
1175 		ret = cdi->ops->open(cdi, 1);
1176 	} else {
1177 		ret = open_for_data(cdi);
1178 		if (ret)
1179 			goto err;
1180 		if (CDROM_CAN(CDC_GENERIC_PACKET))
1181 			cdrom_mmc3_profile(cdi);
1182 		if (mode & FMODE_WRITE) {
1183 			ret = -EROFS;
1184 			if (cdrom_open_write(cdi))
1185 				goto err_release;
1186 			if (!CDROM_CAN(CDC_RAM))
1187 				goto err_release;
1188 			ret = 0;
1189 			cdi->media_written = 0;
1190 		}
1191 	}
1192 
1193 	if (ret)
1194 		goto err;
1195 
1196 	cd_dbg(CD_OPEN, "Use count for \"/dev/%s\" now %d\n",
1197 	       cdi->name, cdi->use_count);
1198 	return 0;
1199 err_release:
1200 	if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
1201 		cdi->ops->lock_door(cdi, 0);
1202 		cd_dbg(CD_OPEN, "door unlocked\n");
1203 	}
1204 	cdi->ops->release(cdi);
1205 err:
1206 	cdi->use_count--;
1207 	return ret;
1208 }
1209 
1210 /* This code is similar to that in open_for_data. The routine is called
1211    whenever an audio play operation is requested.
1212 */
1213 static int check_for_audio_disc(struct cdrom_device_info *cdi,
1214 				const struct cdrom_device_ops *cdo)
1215 {
1216         int ret;
1217 	tracktype tracks;
1218 	cd_dbg(CD_OPEN, "entering check_for_audio_disc\n");
1219 	if (!(cdi->options & CDO_CHECK_TYPE))
1220 		return 0;
1221 	if (cdo->drive_status != NULL) {
1222 		ret = cdo->drive_status(cdi, CDSL_CURRENT);
1223 		cd_dbg(CD_OPEN, "drive_status=%d\n", ret);
1224 		if (ret == CDS_TRAY_OPEN) {
1225 			cd_dbg(CD_OPEN, "the tray is open...\n");
1226 			/* can/may i close it? */
1227 			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
1228 			    cdi->options & CDO_AUTO_CLOSE) {
1229 				cd_dbg(CD_OPEN, "trying to close the tray\n");
1230 				ret=cdo->tray_move(cdi,0);
1231 				if (ret) {
1232 					cd_dbg(CD_OPEN, "bummer. tried to close tray but failed.\n");
1233 					/* Ignore the error from the low
1234 					level driver.  We don't care why it
1235 					couldn't close the tray.  We only care
1236 					that there is no disc in the drive,
1237 					since that is the _REAL_ problem here.*/
1238 					return -ENOMEDIUM;
1239 				}
1240 			} else {
1241 				cd_dbg(CD_OPEN, "bummer. this driver can't close the tray.\n");
1242 				return -ENOMEDIUM;
1243 			}
1244 			/* Ok, the door should be closed now.. Check again */
1245 			ret = cdo->drive_status(cdi, CDSL_CURRENT);
1246 			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
1247 				cd_dbg(CD_OPEN, "bummer. the tray is still not closed.\n");
1248 				return -ENOMEDIUM;
1249 			}
1250 			if (ret!=CDS_DISC_OK) {
1251 				cd_dbg(CD_OPEN, "bummer. disc isn't ready.\n");
1252 				return -EIO;
1253 			}
1254 			cd_dbg(CD_OPEN, "the tray is now closed\n");
1255 		}
1256 	}
1257 	cdrom_count_tracks(cdi, &tracks);
1258 	if (tracks.error)
1259 		return(tracks.error);
1260 
1261 	if (tracks.audio==0)
1262 		return -EMEDIUMTYPE;
1263 
1264 	return 0;
1265 }
1266 
1267 void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode)
1268 {
1269 	const struct cdrom_device_ops *cdo = cdi->ops;
1270 	int opened_for_data;
1271 
1272 	cd_dbg(CD_CLOSE, "entering cdrom_release\n");
1273 
1274 	if (cdi->use_count > 0)
1275 		cdi->use_count--;
1276 
1277 	if (cdi->use_count == 0) {
1278 		cd_dbg(CD_CLOSE, "Use count for \"/dev/%s\" now zero\n",
1279 		       cdi->name);
1280 		cdrom_dvd_rw_close_write(cdi);
1281 
1282 		if ((cdo->capability & CDC_LOCK) && !cdi->keeplocked) {
1283 			cd_dbg(CD_CLOSE, "Unlocking door!\n");
1284 			cdo->lock_door(cdi, 0);
1285 		}
1286 	}
1287 
1288 	opened_for_data = !(cdi->options & CDO_USE_FFLAGS) ||
1289 		!(mode & FMODE_NDELAY);
1290 
1291 	/*
1292 	 * flush cache on last write release
1293 	 */
1294 	if (CDROM_CAN(CDC_RAM) && !cdi->use_count && cdi->for_data)
1295 		cdrom_close_write(cdi);
1296 
1297 	cdo->release(cdi);
1298 	if (cdi->use_count == 0) {      /* last process that closes dev*/
1299 		if (opened_for_data &&
1300 		    cdi->options & CDO_AUTO_EJECT && CDROM_CAN(CDC_OPEN_TRAY))
1301 			cdo->tray_move(cdi, 1);
1302 	}
1303 }
1304 
1305 static int cdrom_read_mech_status(struct cdrom_device_info *cdi,
1306 				  struct cdrom_changer_info *buf)
1307 {
1308 	struct packet_command cgc;
1309 	const struct cdrom_device_ops *cdo = cdi->ops;
1310 	int length;
1311 
1312 	/*
1313 	 * Sanyo changer isn't spec compliant (doesn't use regular change
1314 	 * LOAD_UNLOAD command, and it doesn't implement the mech status
1315 	 * command below
1316 	 */
1317 	if (cdi->sanyo_slot) {
1318 		buf->hdr.nslots = 3;
1319 		buf->hdr.curslot = cdi->sanyo_slot == 3 ? 0 : cdi->sanyo_slot;
1320 		for (length = 0; length < 3; length++) {
1321 			buf->slots[length].disc_present = 1;
1322 			buf->slots[length].change = 0;
1323 		}
1324 		return 0;
1325 	}
1326 
1327 	length = sizeof(struct cdrom_mechstat_header) +
1328 		 cdi->capacity * sizeof(struct cdrom_slot);
1329 
1330 	init_cdrom_command(&cgc, buf, length, CGC_DATA_READ);
1331 	cgc.cmd[0] = GPCMD_MECHANISM_STATUS;
1332 	cgc.cmd[8] = (length >> 8) & 0xff;
1333 	cgc.cmd[9] = length & 0xff;
1334 	return cdo->generic_packet(cdi, &cgc);
1335 }
1336 
1337 static int cdrom_slot_status(struct cdrom_device_info *cdi, int slot)
1338 {
1339 	struct cdrom_changer_info *info;
1340 	int ret;
1341 
1342 	cd_dbg(CD_CHANGER, "entering cdrom_slot_status()\n");
1343 	if (cdi->sanyo_slot)
1344 		return CDS_NO_INFO;
1345 
1346 	info = kmalloc(sizeof(*info), GFP_KERNEL);
1347 	if (!info)
1348 		return -ENOMEM;
1349 
1350 	if ((ret = cdrom_read_mech_status(cdi, info)))
1351 		goto out_free;
1352 
1353 	if (info->slots[slot].disc_present)
1354 		ret = CDS_DISC_OK;
1355 	else
1356 		ret = CDS_NO_DISC;
1357 
1358 out_free:
1359 	kfree(info);
1360 	return ret;
1361 }
1362 
1363 /* Return the number of slots for an ATAPI/SCSI cdrom,
1364  * return 1 if not a changer.
1365  */
1366 int cdrom_number_of_slots(struct cdrom_device_info *cdi)
1367 {
1368 	int status;
1369 	int nslots = 1;
1370 	struct cdrom_changer_info *info;
1371 
1372 	cd_dbg(CD_CHANGER, "entering cdrom_number_of_slots()\n");
1373 	/* cdrom_read_mech_status requires a valid value for capacity: */
1374 	cdi->capacity = 0;
1375 
1376 	info = kmalloc(sizeof(*info), GFP_KERNEL);
1377 	if (!info)
1378 		return -ENOMEM;
1379 
1380 	if ((status = cdrom_read_mech_status(cdi, info)) == 0)
1381 		nslots = info->hdr.nslots;
1382 
1383 	kfree(info);
1384 	return nslots;
1385 }
1386 
1387 
1388 /* If SLOT < 0, unload the current slot.  Otherwise, try to load SLOT. */
1389 static int cdrom_load_unload(struct cdrom_device_info *cdi, int slot)
1390 {
1391 	struct packet_command cgc;
1392 
1393 	cd_dbg(CD_CHANGER, "entering cdrom_load_unload()\n");
1394 	if (cdi->sanyo_slot && slot < 0)
1395 		return 0;
1396 
1397 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1398 	cgc.cmd[0] = GPCMD_LOAD_UNLOAD;
1399 	cgc.cmd[4] = 2 + (slot >= 0);
1400 	cgc.cmd[8] = slot;
1401 	cgc.timeout = 60 * HZ;
1402 
1403 	/* The Sanyo 3 CD changer uses byte 7 of the
1404 	GPCMD_TEST_UNIT_READY to command to switch CDs instead of
1405 	using the GPCMD_LOAD_UNLOAD opcode. */
1406 	if (cdi->sanyo_slot && -1 < slot) {
1407 		cgc.cmd[0] = GPCMD_TEST_UNIT_READY;
1408 		cgc.cmd[7] = slot;
1409 		cgc.cmd[4] = cgc.cmd[8] = 0;
1410 		cdi->sanyo_slot = slot ? slot : 3;
1411 	}
1412 
1413 	return cdi->ops->generic_packet(cdi, &cgc);
1414 }
1415 
1416 static int cdrom_select_disc(struct cdrom_device_info *cdi, int slot)
1417 {
1418 	struct cdrom_changer_info *info;
1419 	int curslot;
1420 	int ret;
1421 
1422 	cd_dbg(CD_CHANGER, "entering cdrom_select_disc()\n");
1423 	if (!CDROM_CAN(CDC_SELECT_DISC))
1424 		return -EDRIVE_CANT_DO_THIS;
1425 
1426 	if (cdi->ops->check_events)
1427 		cdi->ops->check_events(cdi, 0, slot);
1428 
1429 	if (slot == CDSL_NONE) {
1430 		signal_media_change(cdi);
1431 		return cdrom_load_unload(cdi, -1);
1432 	}
1433 
1434 	info = kmalloc(sizeof(*info), GFP_KERNEL);
1435 	if (!info)
1436 		return -ENOMEM;
1437 
1438 	if ((ret = cdrom_read_mech_status(cdi, info))) {
1439 		kfree(info);
1440 		return ret;
1441 	}
1442 
1443 	curslot = info->hdr.curslot;
1444 	kfree(info);
1445 
1446 	if (cdi->use_count > 1 || cdi->keeplocked) {
1447 		if (slot == CDSL_CURRENT) {
1448 	    		return curslot;
1449 		} else {
1450 			return -EBUSY;
1451 		}
1452 	}
1453 
1454 	/* Specifying CDSL_CURRENT will attempt to load the currnet slot,
1455 	which is useful if it had been previously unloaded.
1456 	Whether it can or not, it returns the current slot.
1457 	Similarly,  if slot happens to be the current one, we still
1458 	try and load it. */
1459 	if (slot == CDSL_CURRENT)
1460 		slot = curslot;
1461 
1462 	/* set media changed bits on both queues */
1463 	signal_media_change(cdi);
1464 	if ((ret = cdrom_load_unload(cdi, slot)))
1465 		return ret;
1466 
1467 	return slot;
1468 }
1469 
1470 /*
1471  * As cdrom implements an extra ioctl consumer for media changed
1472  * event, it needs to buffer ->check_events() output, such that event
1473  * is not lost for both the usual VFS and ioctl paths.
1474  * cdi->{vfs|ioctl}_events are used to buffer pending events for each
1475  * path.
1476  *
1477  * XXX: Locking is non-existent.  cdi->ops->check_events() can be
1478  * called in parallel and buffering fields are accessed without any
1479  * exclusion.  The original media_changed code had the same problem.
1480  * It might be better to simply deprecate CDROM_MEDIA_CHANGED ioctl
1481  * and remove this cruft altogether.  It doesn't have much usefulness
1482  * at this point.
1483  */
1484 static void cdrom_update_events(struct cdrom_device_info *cdi,
1485 				unsigned int clearing)
1486 {
1487 	unsigned int events;
1488 
1489 	events = cdi->ops->check_events(cdi, clearing, CDSL_CURRENT);
1490 	cdi->vfs_events |= events;
1491 	cdi->ioctl_events |= events;
1492 }
1493 
1494 unsigned int cdrom_check_events(struct cdrom_device_info *cdi,
1495 				unsigned int clearing)
1496 {
1497 	unsigned int events;
1498 
1499 	cdrom_update_events(cdi, clearing);
1500 	events = cdi->vfs_events;
1501 	cdi->vfs_events = 0;
1502 	return events;
1503 }
1504 EXPORT_SYMBOL(cdrom_check_events);
1505 
1506 /* We want to make media_changed accessible to the user through an
1507  * ioctl. The main problem now is that we must double-buffer the
1508  * low-level implementation, to assure that the VFS and the user both
1509  * see a medium change once.
1510  */
1511 
1512 static
1513 int media_changed(struct cdrom_device_info *cdi, int queue)
1514 {
1515 	unsigned int mask = (1 << (queue & 1));
1516 	int ret = !!(cdi->mc_flags & mask);
1517 	bool changed;
1518 
1519 	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
1520 		return ret;
1521 
1522 	/* changed since last call? */
1523 	BUG_ON(!queue);	/* shouldn't be called from VFS path */
1524 	cdrom_update_events(cdi, DISK_EVENT_MEDIA_CHANGE);
1525 	changed = cdi->ioctl_events & DISK_EVENT_MEDIA_CHANGE;
1526 	cdi->ioctl_events = 0;
1527 
1528 	if (changed) {
1529 		signal_media_change(cdi);
1530 		ret |= 1;
1531 		cdi->media_written = 0;
1532 	}
1533 
1534 	cdi->mc_flags &= ~mask;         /* clear bit */
1535 	return ret;
1536 }
1537 
1538 /* Requests to the low-level drivers will /always/ be done in the
1539    following format convention:
1540 
1541    CDROM_LBA: all data-related requests.
1542    CDROM_MSF: all audio-related requests.
1543 
1544    However, a low-level implementation is allowed to refuse this
1545    request, and return information in its own favorite format.
1546 
1547    It doesn't make sense /at all/ to ask for a play_audio in LBA
1548    format, or ask for multi-session info in MSF format. However, for
1549    backward compatibility these format requests will be satisfied, but
1550    the requests to the low-level drivers will be sanitized in the more
1551    meaningful format indicated above.
1552  */
1553 
1554 static
1555 void sanitize_format(union cdrom_addr *addr,
1556 		     u_char * curr, u_char requested)
1557 {
1558 	if (*curr == requested)
1559 		return;                 /* nothing to be done! */
1560 	if (requested == CDROM_LBA) {
1561 		addr->lba = (int) addr->msf.frame +
1562 			75 * (addr->msf.second - 2 + 60 * addr->msf.minute);
1563 	} else {                        /* CDROM_MSF */
1564 		int lba = addr->lba;
1565 		addr->msf.frame = lba % 75;
1566 		lba /= 75;
1567 		lba += 2;
1568 		addr->msf.second = lba % 60;
1569 		addr->msf.minute = lba / 60;
1570 	}
1571 	*curr = requested;
1572 }
1573 
1574 void init_cdrom_command(struct packet_command *cgc, void *buf, int len,
1575 			int type)
1576 {
1577 	memset(cgc, 0, sizeof(struct packet_command));
1578 	if (buf)
1579 		memset(buf, 0, len);
1580 	cgc->buffer = (char *) buf;
1581 	cgc->buflen = len;
1582 	cgc->data_direction = type;
1583 	cgc->timeout = CDROM_DEF_TIMEOUT;
1584 }
1585 
1586 /* DVD handling */
1587 
1588 #define copy_key(dest,src)	memcpy((dest), (src), sizeof(dvd_key))
1589 #define copy_chal(dest,src)	memcpy((dest), (src), sizeof(dvd_challenge))
1590 
1591 static void setup_report_key(struct packet_command *cgc, unsigned agid, unsigned type)
1592 {
1593 	cgc->cmd[0] = GPCMD_REPORT_KEY;
1594 	cgc->cmd[10] = type | (agid << 6);
1595 	switch (type) {
1596 		case 0: case 8: case 5: {
1597 			cgc->buflen = 8;
1598 			break;
1599 		}
1600 		case 1: {
1601 			cgc->buflen = 16;
1602 			break;
1603 		}
1604 		case 2: case 4: {
1605 			cgc->buflen = 12;
1606 			break;
1607 		}
1608 	}
1609 	cgc->cmd[9] = cgc->buflen;
1610 	cgc->data_direction = CGC_DATA_READ;
1611 }
1612 
1613 static void setup_send_key(struct packet_command *cgc, unsigned agid, unsigned type)
1614 {
1615 	cgc->cmd[0] = GPCMD_SEND_KEY;
1616 	cgc->cmd[10] = type | (agid << 6);
1617 	switch (type) {
1618 		case 1: {
1619 			cgc->buflen = 16;
1620 			break;
1621 		}
1622 		case 3: {
1623 			cgc->buflen = 12;
1624 			break;
1625 		}
1626 		case 6: {
1627 			cgc->buflen = 8;
1628 			break;
1629 		}
1630 	}
1631 	cgc->cmd[9] = cgc->buflen;
1632 	cgc->data_direction = CGC_DATA_WRITE;
1633 }
1634 
1635 static int dvd_do_auth(struct cdrom_device_info *cdi, dvd_authinfo *ai)
1636 {
1637 	int ret;
1638 	u_char buf[20];
1639 	struct packet_command cgc;
1640 	const struct cdrom_device_ops *cdo = cdi->ops;
1641 	rpc_state_t rpc_state;
1642 
1643 	memset(buf, 0, sizeof(buf));
1644 	init_cdrom_command(&cgc, buf, 0, CGC_DATA_READ);
1645 
1646 	switch (ai->type) {
1647 	/* LU data send */
1648 	case DVD_LU_SEND_AGID:
1649 		cd_dbg(CD_DVD, "entering DVD_LU_SEND_AGID\n");
1650 		cgc.quiet = 1;
1651 		setup_report_key(&cgc, ai->lsa.agid, 0);
1652 
1653 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1654 			return ret;
1655 
1656 		ai->lsa.agid = buf[7] >> 6;
1657 		/* Returning data, let host change state */
1658 		break;
1659 
1660 	case DVD_LU_SEND_KEY1:
1661 		cd_dbg(CD_DVD, "entering DVD_LU_SEND_KEY1\n");
1662 		setup_report_key(&cgc, ai->lsk.agid, 2);
1663 
1664 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1665 			return ret;
1666 
1667 		copy_key(ai->lsk.key, &buf[4]);
1668 		/* Returning data, let host change state */
1669 		break;
1670 
1671 	case DVD_LU_SEND_CHALLENGE:
1672 		cd_dbg(CD_DVD, "entering DVD_LU_SEND_CHALLENGE\n");
1673 		setup_report_key(&cgc, ai->lsc.agid, 1);
1674 
1675 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1676 			return ret;
1677 
1678 		copy_chal(ai->lsc.chal, &buf[4]);
1679 		/* Returning data, let host change state */
1680 		break;
1681 
1682 	/* Post-auth key */
1683 	case DVD_LU_SEND_TITLE_KEY:
1684 		cd_dbg(CD_DVD, "entering DVD_LU_SEND_TITLE_KEY\n");
1685 		cgc.quiet = 1;
1686 		setup_report_key(&cgc, ai->lstk.agid, 4);
1687 		cgc.cmd[5] = ai->lstk.lba;
1688 		cgc.cmd[4] = ai->lstk.lba >> 8;
1689 		cgc.cmd[3] = ai->lstk.lba >> 16;
1690 		cgc.cmd[2] = ai->lstk.lba >> 24;
1691 
1692 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1693 			return ret;
1694 
1695 		ai->lstk.cpm = (buf[4] >> 7) & 1;
1696 		ai->lstk.cp_sec = (buf[4] >> 6) & 1;
1697 		ai->lstk.cgms = (buf[4] >> 4) & 3;
1698 		copy_key(ai->lstk.title_key, &buf[5]);
1699 		/* Returning data, let host change state */
1700 		break;
1701 
1702 	case DVD_LU_SEND_ASF:
1703 		cd_dbg(CD_DVD, "entering DVD_LU_SEND_ASF\n");
1704 		setup_report_key(&cgc, ai->lsasf.agid, 5);
1705 
1706 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1707 			return ret;
1708 
1709 		ai->lsasf.asf = buf[7] & 1;
1710 		break;
1711 
1712 	/* LU data receive (LU changes state) */
1713 	case DVD_HOST_SEND_CHALLENGE:
1714 		cd_dbg(CD_DVD, "entering DVD_HOST_SEND_CHALLENGE\n");
1715 		setup_send_key(&cgc, ai->hsc.agid, 1);
1716 		buf[1] = 0xe;
1717 		copy_chal(&buf[4], ai->hsc.chal);
1718 
1719 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1720 			return ret;
1721 
1722 		ai->type = DVD_LU_SEND_KEY1;
1723 		break;
1724 
1725 	case DVD_HOST_SEND_KEY2:
1726 		cd_dbg(CD_DVD, "entering DVD_HOST_SEND_KEY2\n");
1727 		setup_send_key(&cgc, ai->hsk.agid, 3);
1728 		buf[1] = 0xa;
1729 		copy_key(&buf[4], ai->hsk.key);
1730 
1731 		if ((ret = cdo->generic_packet(cdi, &cgc))) {
1732 			ai->type = DVD_AUTH_FAILURE;
1733 			return ret;
1734 		}
1735 		ai->type = DVD_AUTH_ESTABLISHED;
1736 		break;
1737 
1738 	/* Misc */
1739 	case DVD_INVALIDATE_AGID:
1740 		cgc.quiet = 1;
1741 		cd_dbg(CD_DVD, "entering DVD_INVALIDATE_AGID\n");
1742 		setup_report_key(&cgc, ai->lsa.agid, 0x3f);
1743 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1744 			return ret;
1745 		break;
1746 
1747 	/* Get region settings */
1748 	case DVD_LU_SEND_RPC_STATE:
1749 		cd_dbg(CD_DVD, "entering DVD_LU_SEND_RPC_STATE\n");
1750 		setup_report_key(&cgc, 0, 8);
1751 		memset(&rpc_state, 0, sizeof(rpc_state_t));
1752 		cgc.buffer = (char *) &rpc_state;
1753 
1754 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1755 			return ret;
1756 
1757 		ai->lrpcs.type = rpc_state.type_code;
1758 		ai->lrpcs.vra = rpc_state.vra;
1759 		ai->lrpcs.ucca = rpc_state.ucca;
1760 		ai->lrpcs.region_mask = rpc_state.region_mask;
1761 		ai->lrpcs.rpc_scheme = rpc_state.rpc_scheme;
1762 		break;
1763 
1764 	/* Set region settings */
1765 	case DVD_HOST_SEND_RPC_STATE:
1766 		cd_dbg(CD_DVD, "entering DVD_HOST_SEND_RPC_STATE\n");
1767 		setup_send_key(&cgc, 0, 6);
1768 		buf[1] = 6;
1769 		buf[4] = ai->hrpcs.pdrc;
1770 
1771 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1772 			return ret;
1773 		break;
1774 
1775 	default:
1776 		cd_dbg(CD_WARNING, "Invalid DVD key ioctl (%d)\n", ai->type);
1777 		return -ENOTTY;
1778 	}
1779 
1780 	return 0;
1781 }
1782 
1783 static int dvd_read_physical(struct cdrom_device_info *cdi, dvd_struct *s,
1784 				struct packet_command *cgc)
1785 {
1786 	unsigned char buf[21], *base;
1787 	struct dvd_layer *layer;
1788 	const struct cdrom_device_ops *cdo = cdi->ops;
1789 	int ret, layer_num = s->physical.layer_num;
1790 
1791 	if (layer_num >= DVD_LAYERS)
1792 		return -EINVAL;
1793 
1794 	init_cdrom_command(cgc, buf, sizeof(buf), CGC_DATA_READ);
1795 	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1796 	cgc->cmd[6] = layer_num;
1797 	cgc->cmd[7] = s->type;
1798 	cgc->cmd[9] = cgc->buflen & 0xff;
1799 
1800 	/*
1801 	 * refrain from reporting errors on non-existing layers (mainly)
1802 	 */
1803 	cgc->quiet = 1;
1804 
1805 	ret = cdo->generic_packet(cdi, cgc);
1806 	if (ret)
1807 		return ret;
1808 
1809 	base = &buf[4];
1810 	layer = &s->physical.layer[layer_num];
1811 
1812 	/*
1813 	 * place the data... really ugly, but at least we won't have to
1814 	 * worry about endianess in userspace.
1815 	 */
1816 	memset(layer, 0, sizeof(*layer));
1817 	layer->book_version = base[0] & 0xf;
1818 	layer->book_type = base[0] >> 4;
1819 	layer->min_rate = base[1] & 0xf;
1820 	layer->disc_size = base[1] >> 4;
1821 	layer->layer_type = base[2] & 0xf;
1822 	layer->track_path = (base[2] >> 4) & 1;
1823 	layer->nlayers = (base[2] >> 5) & 3;
1824 	layer->track_density = base[3] & 0xf;
1825 	layer->linear_density = base[3] >> 4;
1826 	layer->start_sector = base[5] << 16 | base[6] << 8 | base[7];
1827 	layer->end_sector = base[9] << 16 | base[10] << 8 | base[11];
1828 	layer->end_sector_l0 = base[13] << 16 | base[14] << 8 | base[15];
1829 	layer->bca = base[16] >> 7;
1830 
1831 	return 0;
1832 }
1833 
1834 static int dvd_read_copyright(struct cdrom_device_info *cdi, dvd_struct *s,
1835 				struct packet_command *cgc)
1836 {
1837 	int ret;
1838 	u_char buf[8];
1839 	const struct cdrom_device_ops *cdo = cdi->ops;
1840 
1841 	init_cdrom_command(cgc, buf, sizeof(buf), CGC_DATA_READ);
1842 	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1843 	cgc->cmd[6] = s->copyright.layer_num;
1844 	cgc->cmd[7] = s->type;
1845 	cgc->cmd[8] = cgc->buflen >> 8;
1846 	cgc->cmd[9] = cgc->buflen & 0xff;
1847 
1848 	ret = cdo->generic_packet(cdi, cgc);
1849 	if (ret)
1850 		return ret;
1851 
1852 	s->copyright.cpst = buf[4];
1853 	s->copyright.rmi = buf[5];
1854 
1855 	return 0;
1856 }
1857 
1858 static int dvd_read_disckey(struct cdrom_device_info *cdi, dvd_struct *s,
1859 				struct packet_command *cgc)
1860 {
1861 	int ret, size;
1862 	u_char *buf;
1863 	const struct cdrom_device_ops *cdo = cdi->ops;
1864 
1865 	size = sizeof(s->disckey.value) + 4;
1866 
1867 	buf = kmalloc(size, GFP_KERNEL);
1868 	if (!buf)
1869 		return -ENOMEM;
1870 
1871 	init_cdrom_command(cgc, buf, size, CGC_DATA_READ);
1872 	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1873 	cgc->cmd[7] = s->type;
1874 	cgc->cmd[8] = size >> 8;
1875 	cgc->cmd[9] = size & 0xff;
1876 	cgc->cmd[10] = s->disckey.agid << 6;
1877 
1878 	ret = cdo->generic_packet(cdi, cgc);
1879 	if (!ret)
1880 		memcpy(s->disckey.value, &buf[4], sizeof(s->disckey.value));
1881 
1882 	kfree(buf);
1883 	return ret;
1884 }
1885 
1886 static int dvd_read_bca(struct cdrom_device_info *cdi, dvd_struct *s,
1887 			struct packet_command *cgc)
1888 {
1889 	int ret, size = 4 + 188;
1890 	u_char *buf;
1891 	const struct cdrom_device_ops *cdo = cdi->ops;
1892 
1893 	buf = kmalloc(size, GFP_KERNEL);
1894 	if (!buf)
1895 		return -ENOMEM;
1896 
1897 	init_cdrom_command(cgc, buf, size, CGC_DATA_READ);
1898 	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1899 	cgc->cmd[7] = s->type;
1900 	cgc->cmd[9] = cgc->buflen & 0xff;
1901 
1902 	ret = cdo->generic_packet(cdi, cgc);
1903 	if (ret)
1904 		goto out;
1905 
1906 	s->bca.len = buf[0] << 8 | buf[1];
1907 	if (s->bca.len < 12 || s->bca.len > 188) {
1908 		cd_dbg(CD_WARNING, "Received invalid BCA length (%d)\n",
1909 		       s->bca.len);
1910 		ret = -EIO;
1911 		goto out;
1912 	}
1913 	memcpy(s->bca.value, &buf[4], s->bca.len);
1914 	ret = 0;
1915 out:
1916 	kfree(buf);
1917 	return ret;
1918 }
1919 
1920 static int dvd_read_manufact(struct cdrom_device_info *cdi, dvd_struct *s,
1921 				struct packet_command *cgc)
1922 {
1923 	int ret = 0, size;
1924 	u_char *buf;
1925 	const struct cdrom_device_ops *cdo = cdi->ops;
1926 
1927 	size = sizeof(s->manufact.value) + 4;
1928 
1929 	buf = kmalloc(size, GFP_KERNEL);
1930 	if (!buf)
1931 		return -ENOMEM;
1932 
1933 	init_cdrom_command(cgc, buf, size, CGC_DATA_READ);
1934 	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1935 	cgc->cmd[7] = s->type;
1936 	cgc->cmd[8] = size >> 8;
1937 	cgc->cmd[9] = size & 0xff;
1938 
1939 	ret = cdo->generic_packet(cdi, cgc);
1940 	if (ret)
1941 		goto out;
1942 
1943 	s->manufact.len = buf[0] << 8 | buf[1];
1944 	if (s->manufact.len < 0) {
1945 		cd_dbg(CD_WARNING, "Received invalid manufacture info length (%d)\n",
1946 		       s->manufact.len);
1947 		ret = -EIO;
1948 	} else {
1949 		if (s->manufact.len > 2048) {
1950 			cd_dbg(CD_WARNING, "Received invalid manufacture info length (%d): truncating to 2048\n",
1951 			       s->manufact.len);
1952 			s->manufact.len = 2048;
1953 		}
1954 		memcpy(s->manufact.value, &buf[4], s->manufact.len);
1955 	}
1956 
1957 out:
1958 	kfree(buf);
1959 	return ret;
1960 }
1961 
1962 static int dvd_read_struct(struct cdrom_device_info *cdi, dvd_struct *s,
1963 				struct packet_command *cgc)
1964 {
1965 	switch (s->type) {
1966 	case DVD_STRUCT_PHYSICAL:
1967 		return dvd_read_physical(cdi, s, cgc);
1968 
1969 	case DVD_STRUCT_COPYRIGHT:
1970 		return dvd_read_copyright(cdi, s, cgc);
1971 
1972 	case DVD_STRUCT_DISCKEY:
1973 		return dvd_read_disckey(cdi, s, cgc);
1974 
1975 	case DVD_STRUCT_BCA:
1976 		return dvd_read_bca(cdi, s, cgc);
1977 
1978 	case DVD_STRUCT_MANUFACT:
1979 		return dvd_read_manufact(cdi, s, cgc);
1980 
1981 	default:
1982 		cd_dbg(CD_WARNING, ": Invalid DVD structure read requested (%d)\n",
1983 		       s->type);
1984 		return -EINVAL;
1985 	}
1986 }
1987 
1988 int cdrom_mode_sense(struct cdrom_device_info *cdi,
1989 		     struct packet_command *cgc,
1990 		     int page_code, int page_control)
1991 {
1992 	const struct cdrom_device_ops *cdo = cdi->ops;
1993 
1994 	memset(cgc->cmd, 0, sizeof(cgc->cmd));
1995 
1996 	cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1997 	cgc->cmd[2] = page_code | (page_control << 6);
1998 	cgc->cmd[7] = cgc->buflen >> 8;
1999 	cgc->cmd[8] = cgc->buflen & 0xff;
2000 	cgc->data_direction = CGC_DATA_READ;
2001 	return cdo->generic_packet(cdi, cgc);
2002 }
2003 
2004 int cdrom_mode_select(struct cdrom_device_info *cdi,
2005 		      struct packet_command *cgc)
2006 {
2007 	const struct cdrom_device_ops *cdo = cdi->ops;
2008 
2009 	memset(cgc->cmd, 0, sizeof(cgc->cmd));
2010 	memset(cgc->buffer, 0, 2);
2011 	cgc->cmd[0] = GPCMD_MODE_SELECT_10;
2012 	cgc->cmd[1] = 0x10;		/* PF */
2013 	cgc->cmd[7] = cgc->buflen >> 8;
2014 	cgc->cmd[8] = cgc->buflen & 0xff;
2015 	cgc->data_direction = CGC_DATA_WRITE;
2016 	return cdo->generic_packet(cdi, cgc);
2017 }
2018 
2019 static int cdrom_read_subchannel(struct cdrom_device_info *cdi,
2020 				 struct cdrom_subchnl *subchnl, int mcn)
2021 {
2022 	const struct cdrom_device_ops *cdo = cdi->ops;
2023 	struct packet_command cgc;
2024 	char buffer[32];
2025 	int ret;
2026 
2027 	init_cdrom_command(&cgc, buffer, 16, CGC_DATA_READ);
2028 	cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
2029 	cgc.cmd[1] = subchnl->cdsc_format;/* MSF or LBA addressing */
2030 	cgc.cmd[2] = 0x40;  /* request subQ data */
2031 	cgc.cmd[3] = mcn ? 2 : 1;
2032 	cgc.cmd[8] = 16;
2033 
2034 	if ((ret = cdo->generic_packet(cdi, &cgc)))
2035 		return ret;
2036 
2037 	subchnl->cdsc_audiostatus = cgc.buffer[1];
2038 	subchnl->cdsc_ctrl = cgc.buffer[5] & 0xf;
2039 	subchnl->cdsc_trk = cgc.buffer[6];
2040 	subchnl->cdsc_ind = cgc.buffer[7];
2041 
2042 	if (subchnl->cdsc_format == CDROM_LBA) {
2043 		subchnl->cdsc_absaddr.lba = ((cgc.buffer[8] << 24) |
2044 						(cgc.buffer[9] << 16) |
2045 						(cgc.buffer[10] << 8) |
2046 						(cgc.buffer[11]));
2047 		subchnl->cdsc_reladdr.lba = ((cgc.buffer[12] << 24) |
2048 						(cgc.buffer[13] << 16) |
2049 						(cgc.buffer[14] << 8) |
2050 						(cgc.buffer[15]));
2051 	} else {
2052 		subchnl->cdsc_reladdr.msf.minute = cgc.buffer[13];
2053 		subchnl->cdsc_reladdr.msf.second = cgc.buffer[14];
2054 		subchnl->cdsc_reladdr.msf.frame = cgc.buffer[15];
2055 		subchnl->cdsc_absaddr.msf.minute = cgc.buffer[9];
2056 		subchnl->cdsc_absaddr.msf.second = cgc.buffer[10];
2057 		subchnl->cdsc_absaddr.msf.frame = cgc.buffer[11];
2058 	}
2059 
2060 	return 0;
2061 }
2062 
2063 /*
2064  * Specific READ_10 interface
2065  */
2066 static int cdrom_read_cd(struct cdrom_device_info *cdi,
2067 			 struct packet_command *cgc, int lba,
2068 			 int blocksize, int nblocks)
2069 {
2070 	const struct cdrom_device_ops *cdo = cdi->ops;
2071 
2072 	memset(&cgc->cmd, 0, sizeof(cgc->cmd));
2073 	cgc->cmd[0] = GPCMD_READ_10;
2074 	cgc->cmd[2] = (lba >> 24) & 0xff;
2075 	cgc->cmd[3] = (lba >> 16) & 0xff;
2076 	cgc->cmd[4] = (lba >>  8) & 0xff;
2077 	cgc->cmd[5] = lba & 0xff;
2078 	cgc->cmd[6] = (nblocks >> 16) & 0xff;
2079 	cgc->cmd[7] = (nblocks >>  8) & 0xff;
2080 	cgc->cmd[8] = nblocks & 0xff;
2081 	cgc->buflen = blocksize * nblocks;
2082 	return cdo->generic_packet(cdi, cgc);
2083 }
2084 
2085 /* very generic interface for reading the various types of blocks */
2086 static int cdrom_read_block(struct cdrom_device_info *cdi,
2087 			    struct packet_command *cgc,
2088 			    int lba, int nblocks, int format, int blksize)
2089 {
2090 	const struct cdrom_device_ops *cdo = cdi->ops;
2091 
2092 	memset(&cgc->cmd, 0, sizeof(cgc->cmd));
2093 	cgc->cmd[0] = GPCMD_READ_CD;
2094 	/* expected sector size - cdda,mode1,etc. */
2095 	cgc->cmd[1] = format << 2;
2096 	/* starting address */
2097 	cgc->cmd[2] = (lba >> 24) & 0xff;
2098 	cgc->cmd[3] = (lba >> 16) & 0xff;
2099 	cgc->cmd[4] = (lba >>  8) & 0xff;
2100 	cgc->cmd[5] = lba & 0xff;
2101 	/* number of blocks */
2102 	cgc->cmd[6] = (nblocks >> 16) & 0xff;
2103 	cgc->cmd[7] = (nblocks >>  8) & 0xff;
2104 	cgc->cmd[8] = nblocks & 0xff;
2105 	cgc->buflen = blksize * nblocks;
2106 
2107 	/* set the header info returned */
2108 	switch (blksize) {
2109 	case CD_FRAMESIZE_RAW0	: cgc->cmd[9] = 0x58; break;
2110 	case CD_FRAMESIZE_RAW1	: cgc->cmd[9] = 0x78; break;
2111 	case CD_FRAMESIZE_RAW	: cgc->cmd[9] = 0xf8; break;
2112 	default			: cgc->cmd[9] = 0x10;
2113 	}
2114 
2115 	return cdo->generic_packet(cdi, cgc);
2116 }
2117 
2118 static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2119 			       int lba, int nframes)
2120 {
2121 	struct packet_command cgc;
2122 	int ret = 0;
2123 	int nr;
2124 
2125 	cdi->last_sense = 0;
2126 
2127 	memset(&cgc, 0, sizeof(cgc));
2128 
2129 	/*
2130 	 * start with will ra.nframes size, back down if alloc fails
2131 	 */
2132 	nr = nframes;
2133 	do {
2134 		cgc.buffer = kmalloc_array(nr, CD_FRAMESIZE_RAW, GFP_KERNEL);
2135 		if (cgc.buffer)
2136 			break;
2137 
2138 		nr >>= 1;
2139 	} while (nr);
2140 
2141 	if (!nr)
2142 		return -ENOMEM;
2143 
2144 	cgc.data_direction = CGC_DATA_READ;
2145 	while (nframes > 0) {
2146 		if (nr > nframes)
2147 			nr = nframes;
2148 
2149 		ret = cdrom_read_block(cdi, &cgc, lba, nr, 1, CD_FRAMESIZE_RAW);
2150 		if (ret)
2151 			break;
2152 		if (copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) {
2153 			ret = -EFAULT;
2154 			break;
2155 		}
2156 		ubuf += CD_FRAMESIZE_RAW * nr;
2157 		nframes -= nr;
2158 		lba += nr;
2159 	}
2160 	kfree(cgc.buffer);
2161 	return ret;
2162 }
2163 
2164 static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2165 			       int lba, int nframes)
2166 {
2167 	int max_frames = (queue_max_sectors(cdi->disk->queue) << 9) /
2168 			  CD_FRAMESIZE_RAW;
2169 	int nr, ret = 0;
2170 
2171 	cdi->last_sense = 0;
2172 
2173 	while (nframes) {
2174 		if (cdi->cdda_method == CDDA_BPC_SINGLE)
2175 			nr = 1;
2176 		else
2177 			nr = min(nframes, max_frames);
2178 
2179 		ret = cdi->ops->read_cdda_bpc(cdi, ubuf, lba, nr,
2180 					      &cdi->last_sense);
2181 		if (ret)
2182 			break;
2183 
2184 		nframes -= nr;
2185 		lba += nr;
2186 		ubuf += (nr * CD_FRAMESIZE_RAW);
2187 	}
2188 
2189 	return ret;
2190 }
2191 
2192 static int cdrom_read_cdda(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2193 			   int lba, int nframes)
2194 {
2195 	int ret;
2196 
2197 	if (cdi->cdda_method == CDDA_OLD)
2198 		return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
2199 
2200 retry:
2201 	/*
2202 	 * for anything else than success and io error, we need to retry
2203 	 */
2204 	ret = cdrom_read_cdda_bpc(cdi, ubuf, lba, nframes);
2205 	if (!ret || ret != -EIO)
2206 		return ret;
2207 
2208 	/*
2209 	 * I've seen drives get sense 4/8/3 udma crc errors on multi
2210 	 * frame dma, so drop to single frame dma if we need to
2211 	 */
2212 	if (cdi->cdda_method == CDDA_BPC_FULL && nframes > 1) {
2213 		pr_info("dropping to single frame dma\n");
2214 		cdi->cdda_method = CDDA_BPC_SINGLE;
2215 		goto retry;
2216 	}
2217 
2218 	/*
2219 	 * so we have an io error of some sort with multi frame dma. if the
2220 	 * condition wasn't a hardware error
2221 	 * problems, not for any error
2222 	 */
2223 	if (cdi->last_sense != 0x04 && cdi->last_sense != 0x0b)
2224 		return ret;
2225 
2226 	pr_info("dropping to old style cdda (sense=%x)\n", cdi->last_sense);
2227 	cdi->cdda_method = CDDA_OLD;
2228 	return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
2229 }
2230 
2231 int cdrom_multisession(struct cdrom_device_info *cdi,
2232 		struct cdrom_multisession *info)
2233 {
2234 	u8 requested_format;
2235 	int ret;
2236 
2237 	if (!(cdi->ops->capability & CDC_MULTI_SESSION))
2238 		return -ENOSYS;
2239 
2240 	requested_format = info->addr_format;
2241 	if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
2242 		return -EINVAL;
2243 	info->addr_format = CDROM_LBA;
2244 
2245 	ret = cdi->ops->get_last_session(cdi, info);
2246 	if (!ret)
2247 		sanitize_format(&info->addr, &info->addr_format,
2248 				requested_format);
2249 	return ret;
2250 }
2251 EXPORT_SYMBOL_GPL(cdrom_multisession);
2252 
2253 static int cdrom_ioctl_multisession(struct cdrom_device_info *cdi,
2254 		void __user *argp)
2255 {
2256 	struct cdrom_multisession info;
2257 	int ret;
2258 
2259 	cd_dbg(CD_DO_IOCTL, "entering CDROMMULTISESSION\n");
2260 
2261 	if (copy_from_user(&info, argp, sizeof(info)))
2262 		return -EFAULT;
2263 	ret = cdrom_multisession(cdi, &info);
2264 	if (ret)
2265 		return ret;
2266 	if (copy_to_user(argp, &info, sizeof(info)))
2267 		return -EFAULT;
2268 
2269 	cd_dbg(CD_DO_IOCTL, "CDROMMULTISESSION successful\n");
2270 	return ret;
2271 }
2272 
2273 static int cdrom_ioctl_eject(struct cdrom_device_info *cdi)
2274 {
2275 	cd_dbg(CD_DO_IOCTL, "entering CDROMEJECT\n");
2276 
2277 	if (!CDROM_CAN(CDC_OPEN_TRAY))
2278 		return -ENOSYS;
2279 	if (cdi->use_count != 1 || cdi->keeplocked)
2280 		return -EBUSY;
2281 	if (CDROM_CAN(CDC_LOCK)) {
2282 		int ret = cdi->ops->lock_door(cdi, 0);
2283 		if (ret)
2284 			return ret;
2285 	}
2286 
2287 	return cdi->ops->tray_move(cdi, 1);
2288 }
2289 
2290 static int cdrom_ioctl_closetray(struct cdrom_device_info *cdi)
2291 {
2292 	cd_dbg(CD_DO_IOCTL, "entering CDROMCLOSETRAY\n");
2293 
2294 	if (!CDROM_CAN(CDC_CLOSE_TRAY))
2295 		return -ENOSYS;
2296 	return cdi->ops->tray_move(cdi, 0);
2297 }
2298 
2299 static int cdrom_ioctl_eject_sw(struct cdrom_device_info *cdi,
2300 		unsigned long arg)
2301 {
2302 	cd_dbg(CD_DO_IOCTL, "entering CDROMEJECT_SW\n");
2303 
2304 	if (!CDROM_CAN(CDC_OPEN_TRAY))
2305 		return -ENOSYS;
2306 	if (cdi->keeplocked)
2307 		return -EBUSY;
2308 
2309 	cdi->options &= ~(CDO_AUTO_CLOSE | CDO_AUTO_EJECT);
2310 	if (arg)
2311 		cdi->options |= CDO_AUTO_CLOSE | CDO_AUTO_EJECT;
2312 	return 0;
2313 }
2314 
2315 static int cdrom_ioctl_media_changed(struct cdrom_device_info *cdi,
2316 		unsigned long arg)
2317 {
2318 	struct cdrom_changer_info *info;
2319 	int ret;
2320 
2321 	cd_dbg(CD_DO_IOCTL, "entering CDROM_MEDIA_CHANGED\n");
2322 
2323 	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
2324 		return -ENOSYS;
2325 
2326 	/* cannot select disc or select current disc */
2327 	if (!CDROM_CAN(CDC_SELECT_DISC) || arg == CDSL_CURRENT)
2328 		return media_changed(cdi, 1);
2329 
2330 	if (arg >= cdi->capacity)
2331 		return -EINVAL;
2332 
2333 	info = kmalloc(sizeof(*info), GFP_KERNEL);
2334 	if (!info)
2335 		return -ENOMEM;
2336 
2337 	ret = cdrom_read_mech_status(cdi, info);
2338 	if (!ret)
2339 		ret = info->slots[arg].change;
2340 	kfree(info);
2341 	return ret;
2342 }
2343 
2344 /*
2345  * Media change detection with timing information.
2346  *
2347  * arg is a pointer to a cdrom_timed_media_change_info struct.
2348  * arg->last_media_change may be set by calling code to signal
2349  * the timestamp (in ms) of the last known media change (by the caller).
2350  * Upon successful return, ioctl call will set arg->last_media_change
2351  * to the latest media change timestamp known by the kernel/driver
2352  * and set arg->has_changed to 1 if that timestamp is more recent
2353  * than the timestamp set by the caller.
2354  */
2355 static int cdrom_ioctl_timed_media_change(struct cdrom_device_info *cdi,
2356 		unsigned long arg)
2357 {
2358 	int ret;
2359 	struct cdrom_timed_media_change_info __user *info;
2360 	struct cdrom_timed_media_change_info tmp_info;
2361 
2362 	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
2363 		return -ENOSYS;
2364 
2365 	info = (struct cdrom_timed_media_change_info __user *)arg;
2366 	cd_dbg(CD_DO_IOCTL, "entering CDROM_TIMED_MEDIA_CHANGE\n");
2367 
2368 	ret = cdrom_ioctl_media_changed(cdi, CDSL_CURRENT);
2369 	if (ret < 0)
2370 		return ret;
2371 
2372 	if (copy_from_user(&tmp_info, info, sizeof(tmp_info)) != 0)
2373 		return -EFAULT;
2374 
2375 	tmp_info.media_flags = 0;
2376 	if (tmp_info.last_media_change - cdi->last_media_change_ms < 0)
2377 		tmp_info.media_flags |= MEDIA_CHANGED_FLAG;
2378 
2379 	tmp_info.last_media_change = cdi->last_media_change_ms;
2380 
2381 	if (copy_to_user(info, &tmp_info, sizeof(*info)) != 0)
2382 		return -EFAULT;
2383 
2384 	return 0;
2385 }
2386 
2387 static int cdrom_ioctl_set_options(struct cdrom_device_info *cdi,
2388 		unsigned long arg)
2389 {
2390 	cd_dbg(CD_DO_IOCTL, "entering CDROM_SET_OPTIONS\n");
2391 
2392 	/*
2393 	 * Options need to be in sync with capability.
2394 	 * Too late for that, so we have to check each one separately.
2395 	 */
2396 	switch (arg) {
2397 	case CDO_USE_FFLAGS:
2398 	case CDO_CHECK_TYPE:
2399 		break;
2400 	case CDO_LOCK:
2401 		if (!CDROM_CAN(CDC_LOCK))
2402 			return -ENOSYS;
2403 		break;
2404 	case 0:
2405 		return cdi->options;
2406 	/* default is basically CDO_[AUTO_CLOSE|AUTO_EJECT] */
2407 	default:
2408 		if (!CDROM_CAN(arg))
2409 			return -ENOSYS;
2410 	}
2411 	cdi->options |= (int) arg;
2412 	return cdi->options;
2413 }
2414 
2415 static int cdrom_ioctl_clear_options(struct cdrom_device_info *cdi,
2416 		unsigned long arg)
2417 {
2418 	cd_dbg(CD_DO_IOCTL, "entering CDROM_CLEAR_OPTIONS\n");
2419 
2420 	cdi->options &= ~(int) arg;
2421 	return cdi->options;
2422 }
2423 
2424 static int cdrom_ioctl_select_speed(struct cdrom_device_info *cdi,
2425 		unsigned long arg)
2426 {
2427 	cd_dbg(CD_DO_IOCTL, "entering CDROM_SELECT_SPEED\n");
2428 
2429 	if (!CDROM_CAN(CDC_SELECT_SPEED))
2430 		return -ENOSYS;
2431 	return cdi->ops->select_speed(cdi, arg);
2432 }
2433 
2434 static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi,
2435 		unsigned long arg)
2436 {
2437 	cd_dbg(CD_DO_IOCTL, "entering CDROM_SELECT_DISC\n");
2438 
2439 	if (!CDROM_CAN(CDC_SELECT_DISC))
2440 		return -ENOSYS;
2441 
2442 	if (arg != CDSL_CURRENT && arg != CDSL_NONE) {
2443 		if (arg >= cdi->capacity)
2444 			return -EINVAL;
2445 	}
2446 
2447 	/*
2448 	 * ->select_disc is a hook to allow a driver-specific way of
2449 	 * seleting disc.  However, since there is no equivalent hook for
2450 	 * cdrom_slot_status this may not actually be useful...
2451 	 */
2452 	if (cdi->ops->select_disc)
2453 		return cdi->ops->select_disc(cdi, arg);
2454 
2455 	cd_dbg(CD_CHANGER, "Using generic cdrom_select_disc()\n");
2456 	return cdrom_select_disc(cdi, arg);
2457 }
2458 
2459 static int cdrom_ioctl_reset(struct cdrom_device_info *cdi,
2460 		struct block_device *bdev)
2461 {
2462 	cd_dbg(CD_DO_IOCTL, "entering CDROM_RESET\n");
2463 
2464 	if (!capable(CAP_SYS_ADMIN))
2465 		return -EACCES;
2466 	if (!CDROM_CAN(CDC_RESET))
2467 		return -ENOSYS;
2468 	invalidate_bdev(bdev);
2469 	return cdi->ops->reset(cdi);
2470 }
2471 
2472 static int cdrom_ioctl_lock_door(struct cdrom_device_info *cdi,
2473 		unsigned long arg)
2474 {
2475 	cd_dbg(CD_DO_IOCTL, "%socking door\n", arg ? "L" : "Unl");
2476 
2477 	if (!CDROM_CAN(CDC_LOCK))
2478 		return -EDRIVE_CANT_DO_THIS;
2479 
2480 	cdi->keeplocked = arg ? 1 : 0;
2481 
2482 	/*
2483 	 * Don't unlock the door on multiple opens by default, but allow
2484 	 * root to do so.
2485 	 */
2486 	if (cdi->use_count != 1 && !arg && !capable(CAP_SYS_ADMIN))
2487 		return -EBUSY;
2488 	return cdi->ops->lock_door(cdi, arg);
2489 }
2490 
2491 static int cdrom_ioctl_debug(struct cdrom_device_info *cdi,
2492 		unsigned long arg)
2493 {
2494 	cd_dbg(CD_DO_IOCTL, "%sabling debug\n", arg ? "En" : "Dis");
2495 
2496 	if (!capable(CAP_SYS_ADMIN))
2497 		return -EACCES;
2498 	debug = arg ? 1 : 0;
2499 	return debug;
2500 }
2501 
2502 static int cdrom_ioctl_get_capability(struct cdrom_device_info *cdi)
2503 {
2504 	cd_dbg(CD_DO_IOCTL, "entering CDROM_GET_CAPABILITY\n");
2505 	return (cdi->ops->capability & ~cdi->mask);
2506 }
2507 
2508 /*
2509  * The following function is implemented, although very few audio
2510  * discs give Universal Product Code information, which should just be
2511  * the Medium Catalog Number on the box.  Note, that the way the code
2512  * is written on the CD is /not/ uniform across all discs!
2513  */
2514 static int cdrom_ioctl_get_mcn(struct cdrom_device_info *cdi,
2515 		void __user *argp)
2516 {
2517 	struct cdrom_mcn mcn;
2518 	int ret;
2519 
2520 	cd_dbg(CD_DO_IOCTL, "entering CDROM_GET_MCN\n");
2521 
2522 	if (!(cdi->ops->capability & CDC_MCN))
2523 		return -ENOSYS;
2524 	ret = cdi->ops->get_mcn(cdi, &mcn);
2525 	if (ret)
2526 		return ret;
2527 
2528 	if (copy_to_user(argp, &mcn, sizeof(mcn)))
2529 		return -EFAULT;
2530 	cd_dbg(CD_DO_IOCTL, "CDROM_GET_MCN successful\n");
2531 	return 0;
2532 }
2533 
2534 static int cdrom_ioctl_drive_status(struct cdrom_device_info *cdi,
2535 		unsigned long arg)
2536 {
2537 	cd_dbg(CD_DO_IOCTL, "entering CDROM_DRIVE_STATUS\n");
2538 
2539 	if (!(cdi->ops->capability & CDC_DRIVE_STATUS))
2540 		return -ENOSYS;
2541 	if (!CDROM_CAN(CDC_SELECT_DISC) ||
2542 	    (arg == CDSL_CURRENT || arg == CDSL_NONE))
2543 		return cdi->ops->drive_status(cdi, CDSL_CURRENT);
2544 	if (arg >= cdi->capacity)
2545 		return -EINVAL;
2546 	return cdrom_slot_status(cdi, arg);
2547 }
2548 
2549 /*
2550  * Ok, this is where problems start.  The current interface for the
2551  * CDROM_DISC_STATUS ioctl is flawed.  It makes the false assumption that
2552  * CDs are all CDS_DATA_1 or all CDS_AUDIO, etc.  Unfortunately, while this
2553  * is often the case, it is also very common for CDs to have some tracks
2554  * with data, and some tracks with audio.  Just because I feel like it,
2555  * I declare the following to be the best way to cope.  If the CD has ANY
2556  * data tracks on it, it will be returned as a data CD.  If it has any XA
2557  * tracks, I will return it as that.  Now I could simplify this interface
2558  * by combining these  returns with the above, but this more clearly
2559  * demonstrates the problem with the current interface.  Too bad this
2560  * wasn't designed to use bitmasks...         -Erik
2561  *
2562  * Well, now we have the option CDS_MIXED: a mixed-type CD.
2563  * User level programmers might feel the ioctl is not very useful.
2564  *					---david
2565  */
2566 static int cdrom_ioctl_disc_status(struct cdrom_device_info *cdi)
2567 {
2568 	tracktype tracks;
2569 
2570 	cd_dbg(CD_DO_IOCTL, "entering CDROM_DISC_STATUS\n");
2571 
2572 	cdrom_count_tracks(cdi, &tracks);
2573 	if (tracks.error)
2574 		return tracks.error;
2575 
2576 	/* Policy mode on */
2577 	if (tracks.audio > 0) {
2578 		if (!tracks.data && !tracks.cdi && !tracks.xa)
2579 			return CDS_AUDIO;
2580 		else
2581 			return CDS_MIXED;
2582 	}
2583 
2584 	if (tracks.cdi > 0)
2585 		return CDS_XA_2_2;
2586 	if (tracks.xa > 0)
2587 		return CDS_XA_2_1;
2588 	if (tracks.data > 0)
2589 		return CDS_DATA_1;
2590 	/* Policy mode off */
2591 
2592 	cd_dbg(CD_WARNING, "This disc doesn't have any tracks I recognize!\n");
2593 	return CDS_NO_INFO;
2594 }
2595 
2596 static int cdrom_ioctl_changer_nslots(struct cdrom_device_info *cdi)
2597 {
2598 	cd_dbg(CD_DO_IOCTL, "entering CDROM_CHANGER_NSLOTS\n");
2599 	return cdi->capacity;
2600 }
2601 
2602 static int cdrom_ioctl_get_subchnl(struct cdrom_device_info *cdi,
2603 		void __user *argp)
2604 {
2605 	struct cdrom_subchnl q;
2606 	u8 requested, back;
2607 	int ret;
2608 
2609 	/* cd_dbg(CD_DO_IOCTL,"entering CDROMSUBCHNL\n");*/
2610 
2611 	if (copy_from_user(&q, argp, sizeof(q)))
2612 		return -EFAULT;
2613 
2614 	requested = q.cdsc_format;
2615 	if (requested != CDROM_MSF && requested != CDROM_LBA)
2616 		return -EINVAL;
2617 	q.cdsc_format = CDROM_MSF;
2618 
2619 	ret = cdi->ops->audio_ioctl(cdi, CDROMSUBCHNL, &q);
2620 	if (ret)
2621 		return ret;
2622 
2623 	back = q.cdsc_format; /* local copy */
2624 	sanitize_format(&q.cdsc_absaddr, &back, requested);
2625 	sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
2626 
2627 	if (copy_to_user(argp, &q, sizeof(q)))
2628 		return -EFAULT;
2629 	/* cd_dbg(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
2630 	return 0;
2631 }
2632 
2633 static int cdrom_ioctl_read_tochdr(struct cdrom_device_info *cdi,
2634 		void __user *argp)
2635 {
2636 	struct cdrom_tochdr header;
2637 	int ret;
2638 
2639 	/* cd_dbg(CD_DO_IOCTL, "entering CDROMREADTOCHDR\n"); */
2640 
2641 	if (copy_from_user(&header, argp, sizeof(header)))
2642 		return -EFAULT;
2643 
2644 	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header);
2645 	if (ret)
2646 		return ret;
2647 
2648 	if (copy_to_user(argp, &header, sizeof(header)))
2649 		return -EFAULT;
2650 	/* cd_dbg(CD_DO_IOCTL, "CDROMREADTOCHDR successful\n"); */
2651 	return 0;
2652 }
2653 
2654 int cdrom_read_tocentry(struct cdrom_device_info *cdi,
2655 		struct cdrom_tocentry *entry)
2656 {
2657 	u8 requested_format = entry->cdte_format;
2658 	int ret;
2659 
2660 	if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
2661 		return -EINVAL;
2662 
2663 	/* make interface to low-level uniform */
2664 	entry->cdte_format = CDROM_MSF;
2665 	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, entry);
2666 	if (!ret)
2667 		sanitize_format(&entry->cdte_addr, &entry->cdte_format,
2668 				requested_format);
2669 	return ret;
2670 }
2671 EXPORT_SYMBOL_GPL(cdrom_read_tocentry);
2672 
2673 static int cdrom_ioctl_read_tocentry(struct cdrom_device_info *cdi,
2674 		void __user *argp)
2675 {
2676 	struct cdrom_tocentry entry;
2677 	int ret;
2678 
2679 	if (copy_from_user(&entry, argp, sizeof(entry)))
2680 		return -EFAULT;
2681 	ret = cdrom_read_tocentry(cdi, &entry);
2682 	if (!ret && copy_to_user(argp, &entry, sizeof(entry)))
2683 		return -EFAULT;
2684 	return ret;
2685 }
2686 
2687 static int cdrom_ioctl_play_msf(struct cdrom_device_info *cdi,
2688 		void __user *argp)
2689 {
2690 	struct cdrom_msf msf;
2691 
2692 	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
2693 
2694 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2695 		return -ENOSYS;
2696 	if (copy_from_user(&msf, argp, sizeof(msf)))
2697 		return -EFAULT;
2698 	return cdi->ops->audio_ioctl(cdi, CDROMPLAYMSF, &msf);
2699 }
2700 
2701 static int cdrom_ioctl_play_trkind(struct cdrom_device_info *cdi,
2702 		void __user *argp)
2703 {
2704 	struct cdrom_ti ti;
2705 	int ret;
2706 
2707 	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYTRKIND\n");
2708 
2709 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2710 		return -ENOSYS;
2711 	if (copy_from_user(&ti, argp, sizeof(ti)))
2712 		return -EFAULT;
2713 
2714 	ret = check_for_audio_disc(cdi, cdi->ops);
2715 	if (ret)
2716 		return ret;
2717 	return cdi->ops->audio_ioctl(cdi, CDROMPLAYTRKIND, &ti);
2718 }
2719 static int cdrom_ioctl_volctrl(struct cdrom_device_info *cdi,
2720 		void __user *argp)
2721 {
2722 	struct cdrom_volctrl volume;
2723 
2724 	cd_dbg(CD_DO_IOCTL, "entering CDROMVOLCTRL\n");
2725 
2726 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2727 		return -ENOSYS;
2728 	if (copy_from_user(&volume, argp, sizeof(volume)))
2729 		return -EFAULT;
2730 	return cdi->ops->audio_ioctl(cdi, CDROMVOLCTRL, &volume);
2731 }
2732 
2733 static int cdrom_ioctl_volread(struct cdrom_device_info *cdi,
2734 		void __user *argp)
2735 {
2736 	struct cdrom_volctrl volume;
2737 	int ret;
2738 
2739 	cd_dbg(CD_DO_IOCTL, "entering CDROMVOLREAD\n");
2740 
2741 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2742 		return -ENOSYS;
2743 
2744 	ret = cdi->ops->audio_ioctl(cdi, CDROMVOLREAD, &volume);
2745 	if (ret)
2746 		return ret;
2747 
2748 	if (copy_to_user(argp, &volume, sizeof(volume)))
2749 		return -EFAULT;
2750 	return 0;
2751 }
2752 
2753 static int cdrom_ioctl_audioctl(struct cdrom_device_info *cdi,
2754 		unsigned int cmd)
2755 {
2756 	int ret;
2757 
2758 	cd_dbg(CD_DO_IOCTL, "doing audio ioctl (start/stop/pause/resume)\n");
2759 
2760 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2761 		return -ENOSYS;
2762 	ret = check_for_audio_disc(cdi, cdi->ops);
2763 	if (ret)
2764 		return ret;
2765 	return cdi->ops->audio_ioctl(cdi, cmd, NULL);
2766 }
2767 
2768 /*
2769  * Required when we need to use READ_10 to issue other than 2048 block
2770  * reads
2771  */
2772 static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
2773 {
2774 	const struct cdrom_device_ops *cdo = cdi->ops;
2775 	struct packet_command cgc;
2776 	struct modesel_head mh;
2777 
2778 	memset(&mh, 0, sizeof(mh));
2779 	mh.block_desc_length = 0x08;
2780 	mh.block_length_med = (size >> 8) & 0xff;
2781 	mh.block_length_lo = size & 0xff;
2782 
2783 	memset(&cgc, 0, sizeof(cgc));
2784 	cgc.cmd[0] = 0x15;
2785 	cgc.cmd[1] = 1 << 4;
2786 	cgc.cmd[4] = 12;
2787 	cgc.buflen = sizeof(mh);
2788 	cgc.buffer = (char *) &mh;
2789 	cgc.data_direction = CGC_DATA_WRITE;
2790 	mh.block_desc_length = 0x08;
2791 	mh.block_length_med = (size >> 8) & 0xff;
2792 	mh.block_length_lo = size & 0xff;
2793 
2794 	return cdo->generic_packet(cdi, &cgc);
2795 }
2796 
2797 static int cdrom_get_track_info(struct cdrom_device_info *cdi,
2798 				__u16 track, __u8 type, track_information *ti)
2799 {
2800 	const struct cdrom_device_ops *cdo = cdi->ops;
2801 	struct packet_command cgc;
2802 	int ret, buflen;
2803 
2804 	init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
2805 	cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
2806 	cgc.cmd[1] = type & 3;
2807 	cgc.cmd[4] = (track & 0xff00) >> 8;
2808 	cgc.cmd[5] = track & 0xff;
2809 	cgc.cmd[8] = 8;
2810 	cgc.quiet = 1;
2811 
2812 	ret = cdo->generic_packet(cdi, &cgc);
2813 	if (ret)
2814 		return ret;
2815 
2816 	buflen = be16_to_cpu(ti->track_information_length) +
2817 		sizeof(ti->track_information_length);
2818 
2819 	if (buflen > sizeof(track_information))
2820 		buflen = sizeof(track_information);
2821 
2822 	cgc.cmd[8] = cgc.buflen = buflen;
2823 	ret = cdo->generic_packet(cdi, &cgc);
2824 	if (ret)
2825 		return ret;
2826 
2827 	/* return actual fill size */
2828 	return buflen;
2829 }
2830 
2831 /* return the last written block on the CD-R media. this is for the udf
2832    file system. */
2833 int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written)
2834 {
2835 	struct cdrom_tocentry toc;
2836 	disc_information di;
2837 	track_information ti;
2838 	__u32 last_track;
2839 	int ret = -1, ti_size;
2840 
2841 	if (!CDROM_CAN(CDC_GENERIC_PACKET))
2842 		goto use_toc;
2843 
2844 	ret = cdrom_get_disc_info(cdi, &di);
2845 	if (ret < (int)(offsetof(typeof(di), last_track_lsb)
2846 			+ sizeof(di.last_track_lsb)))
2847 		goto use_toc;
2848 
2849 	/* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
2850 	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
2851 	ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
2852 	if (ti_size < (int)offsetof(typeof(ti), track_start))
2853 		goto use_toc;
2854 
2855 	/* if this track is blank, try the previous. */
2856 	if (ti.blank) {
2857 		if (last_track == 1)
2858 			goto use_toc;
2859 		last_track--;
2860 		ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
2861 	}
2862 
2863 	if (ti_size < (int)(offsetof(typeof(ti), track_size)
2864 				+ sizeof(ti.track_size)))
2865 		goto use_toc;
2866 
2867 	/* if last recorded field is valid, return it. */
2868 	if (ti.lra_v && ti_size >= (int)(offsetof(typeof(ti), last_rec_address)
2869 				+ sizeof(ti.last_rec_address))) {
2870 		*last_written = be32_to_cpu(ti.last_rec_address);
2871 	} else {
2872 		/* make it up instead */
2873 		*last_written = be32_to_cpu(ti.track_start) +
2874 				be32_to_cpu(ti.track_size);
2875 		if (ti.free_blocks)
2876 			*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
2877 	}
2878 	return 0;
2879 
2880 	/* this is where we end up if the drive either can't do a
2881 	   GPCMD_READ_DISC_INFO or GPCMD_READ_TRACK_RZONE_INFO or if
2882 	   it doesn't give enough information or fails. then we return
2883 	   the toc contents. */
2884 use_toc:
2885 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2886 		return -ENOSYS;
2887 
2888 	toc.cdte_format = CDROM_MSF;
2889 	toc.cdte_track = CDROM_LEADOUT;
2890 	if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &toc)))
2891 		return ret;
2892 	sanitize_format(&toc.cdte_addr, &toc.cdte_format, CDROM_LBA);
2893 	*last_written = toc.cdte_addr.lba;
2894 	return 0;
2895 }
2896 
2897 /* return the next writable block. also for udf file system. */
2898 static int cdrom_get_next_writable(struct cdrom_device_info *cdi,
2899 				   long *next_writable)
2900 {
2901 	disc_information di;
2902 	track_information ti;
2903 	__u16 last_track;
2904 	int ret, ti_size;
2905 
2906 	if (!CDROM_CAN(CDC_GENERIC_PACKET))
2907 		goto use_last_written;
2908 
2909 	ret = cdrom_get_disc_info(cdi, &di);
2910 	if (ret < 0 || ret < offsetof(typeof(di), last_track_lsb)
2911 				+ sizeof(di.last_track_lsb))
2912 		goto use_last_written;
2913 
2914 	/* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
2915 	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
2916 	ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
2917 	if (ti_size < 0 || ti_size < offsetof(typeof(ti), track_start))
2918 		goto use_last_written;
2919 
2920 	/* if this track is blank, try the previous. */
2921 	if (ti.blank) {
2922 		if (last_track == 1)
2923 			goto use_last_written;
2924 		last_track--;
2925 		ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
2926 		if (ti_size < 0)
2927 			goto use_last_written;
2928 	}
2929 
2930 	/* if next recordable address field is valid, use it. */
2931 	if (ti.nwa_v && ti_size >= offsetof(typeof(ti), next_writable)
2932 				+ sizeof(ti.next_writable)) {
2933 		*next_writable = be32_to_cpu(ti.next_writable);
2934 		return 0;
2935 	}
2936 
2937 use_last_written:
2938 	ret = cdrom_get_last_written(cdi, next_writable);
2939 	if (ret) {
2940 		*next_writable = 0;
2941 		return ret;
2942 	} else {
2943 		*next_writable += 7;
2944 		return 0;
2945 	}
2946 }
2947 
2948 static noinline int mmc_ioctl_cdrom_read_data(struct cdrom_device_info *cdi,
2949 					      void __user *arg,
2950 					      struct packet_command *cgc,
2951 					      int cmd)
2952 {
2953 	struct scsi_sense_hdr sshdr;
2954 	struct cdrom_msf msf;
2955 	int blocksize = 0, format = 0, lba;
2956 	int ret;
2957 
2958 	switch (cmd) {
2959 	case CDROMREADRAW:
2960 		blocksize = CD_FRAMESIZE_RAW;
2961 		break;
2962 	case CDROMREADMODE1:
2963 		blocksize = CD_FRAMESIZE;
2964 		format = 2;
2965 		break;
2966 	case CDROMREADMODE2:
2967 		blocksize = CD_FRAMESIZE_RAW0;
2968 		break;
2969 	}
2970 	if (copy_from_user(&msf, (struct cdrom_msf __user *)arg, sizeof(msf)))
2971 		return -EFAULT;
2972 	lba = msf_to_lba(msf.cdmsf_min0, msf.cdmsf_sec0, msf.cdmsf_frame0);
2973 	/* FIXME: we need upper bound checking, too!! */
2974 	if (lba < 0)
2975 		return -EINVAL;
2976 
2977 	cgc->buffer = kzalloc(blocksize, GFP_KERNEL);
2978 	if (cgc->buffer == NULL)
2979 		return -ENOMEM;
2980 
2981 	memset(&sshdr, 0, sizeof(sshdr));
2982 	cgc->sshdr = &sshdr;
2983 	cgc->data_direction = CGC_DATA_READ;
2984 	ret = cdrom_read_block(cdi, cgc, lba, 1, format, blocksize);
2985 	if (ret && sshdr.sense_key == 0x05 &&
2986 	    sshdr.asc == 0x20 &&
2987 	    sshdr.ascq == 0x00) {
2988 		/*
2989 		 * SCSI-II devices are not required to support
2990 		 * READ_CD, so let's try switching block size
2991 		 */
2992 		if (blocksize != CD_FRAMESIZE) {
2993 			ret = cdrom_switch_blocksize(cdi, blocksize);
2994 			if (ret)
2995 				goto out;
2996 		}
2997 		cgc->sshdr = NULL;
2998 		ret = cdrom_read_cd(cdi, cgc, lba, blocksize, 1);
2999 		if (blocksize != CD_FRAMESIZE)
3000 			ret |= cdrom_switch_blocksize(cdi, CD_FRAMESIZE);
3001 	}
3002 	if (!ret && copy_to_user(arg, cgc->buffer, blocksize))
3003 		ret = -EFAULT;
3004 out:
3005 	kfree(cgc->buffer);
3006 	return ret;
3007 }
3008 
3009 static noinline int mmc_ioctl_cdrom_read_audio(struct cdrom_device_info *cdi,
3010 					       void __user *arg)
3011 {
3012 	struct cdrom_read_audio ra;
3013 	int lba;
3014 
3015 #ifdef CONFIG_COMPAT
3016 	if (in_compat_syscall()) {
3017 		struct compat_cdrom_read_audio {
3018 			union cdrom_addr	addr;
3019 			u8			addr_format;
3020 			compat_int_t		nframes;
3021 			compat_caddr_t		buf;
3022 		} ra32;
3023 
3024 		if (copy_from_user(&ra32, arg, sizeof(ra32)))
3025 			return -EFAULT;
3026 
3027 		ra = (struct cdrom_read_audio) {
3028 			.addr		= ra32.addr,
3029 			.addr_format	= ra32.addr_format,
3030 			.nframes	= ra32.nframes,
3031 			.buf		= compat_ptr(ra32.buf),
3032 		};
3033 	} else
3034 #endif
3035 	{
3036 		if (copy_from_user(&ra, (struct cdrom_read_audio __user *)arg,
3037 				   sizeof(ra)))
3038 			return -EFAULT;
3039 	}
3040 
3041 	if (ra.addr_format == CDROM_MSF)
3042 		lba = msf_to_lba(ra.addr.msf.minute,
3043 				 ra.addr.msf.second,
3044 				 ra.addr.msf.frame);
3045 	else if (ra.addr_format == CDROM_LBA)
3046 		lba = ra.addr.lba;
3047 	else
3048 		return -EINVAL;
3049 
3050 	/* FIXME: we need upper bound checking, too!! */
3051 	if (lba < 0 || ra.nframes <= 0 || ra.nframes > CD_FRAMES)
3052 		return -EINVAL;
3053 
3054 	return cdrom_read_cdda(cdi, ra.buf, lba, ra.nframes);
3055 }
3056 
3057 static noinline int mmc_ioctl_cdrom_subchannel(struct cdrom_device_info *cdi,
3058 					       void __user *arg)
3059 {
3060 	int ret;
3061 	struct cdrom_subchnl q;
3062 	u_char requested, back;
3063 	if (copy_from_user(&q, (struct cdrom_subchnl __user *)arg, sizeof(q)))
3064 		return -EFAULT;
3065 	requested = q.cdsc_format;
3066 	if (!((requested == CDROM_MSF) ||
3067 	      (requested == CDROM_LBA)))
3068 		return -EINVAL;
3069 
3070 	ret = cdrom_read_subchannel(cdi, &q, 0);
3071 	if (ret)
3072 		return ret;
3073 	back = q.cdsc_format; /* local copy */
3074 	sanitize_format(&q.cdsc_absaddr, &back, requested);
3075 	sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
3076 	if (copy_to_user((struct cdrom_subchnl __user *)arg, &q, sizeof(q)))
3077 		return -EFAULT;
3078 	/* cd_dbg(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
3079 	return 0;
3080 }
3081 
3082 static noinline int mmc_ioctl_cdrom_play_msf(struct cdrom_device_info *cdi,
3083 					     void __user *arg,
3084 					     struct packet_command *cgc)
3085 {
3086 	const struct cdrom_device_ops *cdo = cdi->ops;
3087 	struct cdrom_msf msf;
3088 	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
3089 	if (copy_from_user(&msf, (struct cdrom_msf __user *)arg, sizeof(msf)))
3090 		return -EFAULT;
3091 	cgc->cmd[0] = GPCMD_PLAY_AUDIO_MSF;
3092 	cgc->cmd[3] = msf.cdmsf_min0;
3093 	cgc->cmd[4] = msf.cdmsf_sec0;
3094 	cgc->cmd[5] = msf.cdmsf_frame0;
3095 	cgc->cmd[6] = msf.cdmsf_min1;
3096 	cgc->cmd[7] = msf.cdmsf_sec1;
3097 	cgc->cmd[8] = msf.cdmsf_frame1;
3098 	cgc->data_direction = CGC_DATA_NONE;
3099 	return cdo->generic_packet(cdi, cgc);
3100 }
3101 
3102 static noinline int mmc_ioctl_cdrom_play_blk(struct cdrom_device_info *cdi,
3103 					     void __user *arg,
3104 					     struct packet_command *cgc)
3105 {
3106 	const struct cdrom_device_ops *cdo = cdi->ops;
3107 	struct cdrom_blk blk;
3108 	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
3109 	if (copy_from_user(&blk, (struct cdrom_blk __user *)arg, sizeof(blk)))
3110 		return -EFAULT;
3111 	cgc->cmd[0] = GPCMD_PLAY_AUDIO_10;
3112 	cgc->cmd[2] = (blk.from >> 24) & 0xff;
3113 	cgc->cmd[3] = (blk.from >> 16) & 0xff;
3114 	cgc->cmd[4] = (blk.from >>  8) & 0xff;
3115 	cgc->cmd[5] = blk.from & 0xff;
3116 	cgc->cmd[7] = (blk.len >> 8) & 0xff;
3117 	cgc->cmd[8] = blk.len & 0xff;
3118 	cgc->data_direction = CGC_DATA_NONE;
3119 	return cdo->generic_packet(cdi, cgc);
3120 }
3121 
3122 static noinline int mmc_ioctl_cdrom_volume(struct cdrom_device_info *cdi,
3123 					   void __user *arg,
3124 					   struct packet_command *cgc,
3125 					   unsigned int cmd)
3126 {
3127 	struct cdrom_volctrl volctrl;
3128 	unsigned char buffer[32];
3129 	char mask[sizeof(buffer)];
3130 	unsigned short offset;
3131 	int ret;
3132 
3133 	cd_dbg(CD_DO_IOCTL, "entering CDROMVOLUME\n");
3134 
3135 	if (copy_from_user(&volctrl, (struct cdrom_volctrl __user *)arg,
3136 			   sizeof(volctrl)))
3137 		return -EFAULT;
3138 
3139 	cgc->buffer = buffer;
3140 	cgc->buflen = 24;
3141 	ret = cdrom_mode_sense(cdi, cgc, GPMODE_AUDIO_CTL_PAGE, 0);
3142 	if (ret)
3143 		return ret;
3144 
3145 	/* originally the code depended on buffer[1] to determine
3146 	   how much data is available for transfer. buffer[1] is
3147 	   unfortunately ambigious and the only reliable way seem
3148 	   to be to simply skip over the block descriptor... */
3149 	offset = 8 + be16_to_cpu(*(__be16 *)(buffer + 6));
3150 
3151 	if (offset + 16 > sizeof(buffer))
3152 		return -E2BIG;
3153 
3154 	if (offset + 16 > cgc->buflen) {
3155 		cgc->buflen = offset + 16;
3156 		ret = cdrom_mode_sense(cdi, cgc,
3157 				       GPMODE_AUDIO_CTL_PAGE, 0);
3158 		if (ret)
3159 			return ret;
3160 	}
3161 
3162 	/* sanity check */
3163 	if ((buffer[offset] & 0x3f) != GPMODE_AUDIO_CTL_PAGE ||
3164 	    buffer[offset + 1] < 14)
3165 		return -EINVAL;
3166 
3167 	/* now we have the current volume settings. if it was only
3168 	   a CDROMVOLREAD, return these values */
3169 	if (cmd == CDROMVOLREAD) {
3170 		volctrl.channel0 = buffer[offset+9];
3171 		volctrl.channel1 = buffer[offset+11];
3172 		volctrl.channel2 = buffer[offset+13];
3173 		volctrl.channel3 = buffer[offset+15];
3174 		if (copy_to_user((struct cdrom_volctrl __user *)arg, &volctrl,
3175 				 sizeof(volctrl)))
3176 			return -EFAULT;
3177 		return 0;
3178 	}
3179 
3180 	/* get the volume mask */
3181 	cgc->buffer = mask;
3182 	ret = cdrom_mode_sense(cdi, cgc, GPMODE_AUDIO_CTL_PAGE, 1);
3183 	if (ret)
3184 		return ret;
3185 
3186 	buffer[offset + 9]  = volctrl.channel0 & mask[offset + 9];
3187 	buffer[offset + 11] = volctrl.channel1 & mask[offset + 11];
3188 	buffer[offset + 13] = volctrl.channel2 & mask[offset + 13];
3189 	buffer[offset + 15] = volctrl.channel3 & mask[offset + 15];
3190 
3191 	/* set volume */
3192 	cgc->buffer = buffer + offset - 8;
3193 	memset(cgc->buffer, 0, 8);
3194 	return cdrom_mode_select(cdi, cgc);
3195 }
3196 
3197 static noinline int mmc_ioctl_cdrom_start_stop(struct cdrom_device_info *cdi,
3198 					       struct packet_command *cgc,
3199 					       int cmd)
3200 {
3201 	const struct cdrom_device_ops *cdo = cdi->ops;
3202 	cd_dbg(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n");
3203 	cgc->cmd[0] = GPCMD_START_STOP_UNIT;
3204 	cgc->cmd[1] = 1;
3205 	cgc->cmd[4] = (cmd == CDROMSTART) ? 1 : 0;
3206 	cgc->data_direction = CGC_DATA_NONE;
3207 	return cdo->generic_packet(cdi, cgc);
3208 }
3209 
3210 static noinline int mmc_ioctl_cdrom_pause_resume(struct cdrom_device_info *cdi,
3211 						 struct packet_command *cgc,
3212 						 int cmd)
3213 {
3214 	const struct cdrom_device_ops *cdo = cdi->ops;
3215 	cd_dbg(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n");
3216 	cgc->cmd[0] = GPCMD_PAUSE_RESUME;
3217 	cgc->cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
3218 	cgc->data_direction = CGC_DATA_NONE;
3219 	return cdo->generic_packet(cdi, cgc);
3220 }
3221 
3222 static noinline int mmc_ioctl_dvd_read_struct(struct cdrom_device_info *cdi,
3223 					      void __user *arg,
3224 					      struct packet_command *cgc)
3225 {
3226 	int ret;
3227 	dvd_struct *s;
3228 	int size = sizeof(dvd_struct);
3229 
3230 	if (!CDROM_CAN(CDC_DVD))
3231 		return -ENOSYS;
3232 
3233 	s = memdup_user(arg, size);
3234 	if (IS_ERR(s))
3235 		return PTR_ERR(s);
3236 
3237 	cd_dbg(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n");
3238 
3239 	ret = dvd_read_struct(cdi, s, cgc);
3240 	if (ret)
3241 		goto out;
3242 
3243 	if (copy_to_user(arg, s, size))
3244 		ret = -EFAULT;
3245 out:
3246 	kfree(s);
3247 	return ret;
3248 }
3249 
3250 static noinline int mmc_ioctl_dvd_auth(struct cdrom_device_info *cdi,
3251 				       void __user *arg)
3252 {
3253 	int ret;
3254 	dvd_authinfo ai;
3255 	if (!CDROM_CAN(CDC_DVD))
3256 		return -ENOSYS;
3257 	cd_dbg(CD_DO_IOCTL, "entering DVD_AUTH\n");
3258 	if (copy_from_user(&ai, (dvd_authinfo __user *)arg, sizeof(ai)))
3259 		return -EFAULT;
3260 	ret = dvd_do_auth(cdi, &ai);
3261 	if (ret)
3262 		return ret;
3263 	if (copy_to_user((dvd_authinfo __user *)arg, &ai, sizeof(ai)))
3264 		return -EFAULT;
3265 	return 0;
3266 }
3267 
3268 static noinline int mmc_ioctl_cdrom_next_writable(struct cdrom_device_info *cdi,
3269 						  void __user *arg)
3270 {
3271 	int ret;
3272 	long next = 0;
3273 	cd_dbg(CD_DO_IOCTL, "entering CDROM_NEXT_WRITABLE\n");
3274 	ret = cdrom_get_next_writable(cdi, &next);
3275 	if (ret)
3276 		return ret;
3277 	if (copy_to_user((long __user *)arg, &next, sizeof(next)))
3278 		return -EFAULT;
3279 	return 0;
3280 }
3281 
3282 static noinline int mmc_ioctl_cdrom_last_written(struct cdrom_device_info *cdi,
3283 						 void __user *arg)
3284 {
3285 	int ret;
3286 	long last = 0;
3287 	cd_dbg(CD_DO_IOCTL, "entering CDROM_LAST_WRITTEN\n");
3288 	ret = cdrom_get_last_written(cdi, &last);
3289 	if (ret)
3290 		return ret;
3291 	if (in_compat_syscall())
3292 		return put_user(last, (__s32 __user *)arg);
3293 
3294 	return put_user(last, (long __user *)arg);
3295 }
3296 
3297 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
3298 		     unsigned long arg)
3299 {
3300 	struct packet_command cgc;
3301 	void __user *userptr = (void __user *)arg;
3302 
3303 	memset(&cgc, 0, sizeof(cgc));
3304 
3305 	/* build a unified command and queue it through
3306 	   cdo->generic_packet() */
3307 	switch (cmd) {
3308 	case CDROMREADRAW:
3309 	case CDROMREADMODE1:
3310 	case CDROMREADMODE2:
3311 		return mmc_ioctl_cdrom_read_data(cdi, userptr, &cgc, cmd);
3312 	case CDROMREADAUDIO:
3313 		return mmc_ioctl_cdrom_read_audio(cdi, userptr);
3314 	case CDROMSUBCHNL:
3315 		return mmc_ioctl_cdrom_subchannel(cdi, userptr);
3316 	case CDROMPLAYMSF:
3317 		return mmc_ioctl_cdrom_play_msf(cdi, userptr, &cgc);
3318 	case CDROMPLAYBLK:
3319 		return mmc_ioctl_cdrom_play_blk(cdi, userptr, &cgc);
3320 	case CDROMVOLCTRL:
3321 	case CDROMVOLREAD:
3322 		return mmc_ioctl_cdrom_volume(cdi, userptr, &cgc, cmd);
3323 	case CDROMSTART:
3324 	case CDROMSTOP:
3325 		return mmc_ioctl_cdrom_start_stop(cdi, &cgc, cmd);
3326 	case CDROMPAUSE:
3327 	case CDROMRESUME:
3328 		return mmc_ioctl_cdrom_pause_resume(cdi, &cgc, cmd);
3329 	case DVD_READ_STRUCT:
3330 		return mmc_ioctl_dvd_read_struct(cdi, userptr, &cgc);
3331 	case DVD_AUTH:
3332 		return mmc_ioctl_dvd_auth(cdi, userptr);
3333 	case CDROM_NEXT_WRITABLE:
3334 		return mmc_ioctl_cdrom_next_writable(cdi, userptr);
3335 	case CDROM_LAST_WRITTEN:
3336 		return mmc_ioctl_cdrom_last_written(cdi, userptr);
3337 	}
3338 
3339 	return -ENOTTY;
3340 }
3341 
3342 /*
3343  * Just about every imaginable ioctl is supported in the Uniform layer
3344  * these days.
3345  * ATAPI / SCSI specific code now mainly resides in mmc_ioctl().
3346  */
3347 int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
3348 		fmode_t mode, unsigned int cmd, unsigned long arg)
3349 {
3350 	void __user *argp = (void __user *)arg;
3351 	int ret;
3352 
3353 	switch (cmd) {
3354 	case CDROMMULTISESSION:
3355 		return cdrom_ioctl_multisession(cdi, argp);
3356 	case CDROMEJECT:
3357 		return cdrom_ioctl_eject(cdi);
3358 	case CDROMCLOSETRAY:
3359 		return cdrom_ioctl_closetray(cdi);
3360 	case CDROMEJECT_SW:
3361 		return cdrom_ioctl_eject_sw(cdi, arg);
3362 	case CDROM_MEDIA_CHANGED:
3363 		return cdrom_ioctl_media_changed(cdi, arg);
3364 	case CDROM_TIMED_MEDIA_CHANGE:
3365 		return cdrom_ioctl_timed_media_change(cdi, arg);
3366 	case CDROM_SET_OPTIONS:
3367 		return cdrom_ioctl_set_options(cdi, arg);
3368 	case CDROM_CLEAR_OPTIONS:
3369 		return cdrom_ioctl_clear_options(cdi, arg);
3370 	case CDROM_SELECT_SPEED:
3371 		return cdrom_ioctl_select_speed(cdi, arg);
3372 	case CDROM_SELECT_DISC:
3373 		return cdrom_ioctl_select_disc(cdi, arg);
3374 	case CDROMRESET:
3375 		return cdrom_ioctl_reset(cdi, bdev);
3376 	case CDROM_LOCKDOOR:
3377 		return cdrom_ioctl_lock_door(cdi, arg);
3378 	case CDROM_DEBUG:
3379 		return cdrom_ioctl_debug(cdi, arg);
3380 	case CDROM_GET_CAPABILITY:
3381 		return cdrom_ioctl_get_capability(cdi);
3382 	case CDROM_GET_MCN:
3383 		return cdrom_ioctl_get_mcn(cdi, argp);
3384 	case CDROM_DRIVE_STATUS:
3385 		return cdrom_ioctl_drive_status(cdi, arg);
3386 	case CDROM_DISC_STATUS:
3387 		return cdrom_ioctl_disc_status(cdi);
3388 	case CDROM_CHANGER_NSLOTS:
3389 		return cdrom_ioctl_changer_nslots(cdi);
3390 	}
3391 
3392 	/*
3393 	 * Use the ioctls that are implemented through the generic_packet()
3394 	 * interface. this may look at bit funny, but if -ENOTTY is
3395 	 * returned that particular ioctl is not implemented and we
3396 	 * let it go through the device specific ones.
3397 	 */
3398 	if (CDROM_CAN(CDC_GENERIC_PACKET)) {
3399 		ret = mmc_ioctl(cdi, cmd, arg);
3400 		if (ret != -ENOTTY)
3401 			return ret;
3402 	}
3403 
3404 	/*
3405 	 * Note: most of the cd_dbg() calls are commented out here,
3406 	 * because they fill up the sys log when CD players poll
3407 	 * the drive.
3408 	 */
3409 	switch (cmd) {
3410 	case CDROMSUBCHNL:
3411 		return cdrom_ioctl_get_subchnl(cdi, argp);
3412 	case CDROMREADTOCHDR:
3413 		return cdrom_ioctl_read_tochdr(cdi, argp);
3414 	case CDROMREADTOCENTRY:
3415 		return cdrom_ioctl_read_tocentry(cdi, argp);
3416 	case CDROMPLAYMSF:
3417 		return cdrom_ioctl_play_msf(cdi, argp);
3418 	case CDROMPLAYTRKIND:
3419 		return cdrom_ioctl_play_trkind(cdi, argp);
3420 	case CDROMVOLCTRL:
3421 		return cdrom_ioctl_volctrl(cdi, argp);
3422 	case CDROMVOLREAD:
3423 		return cdrom_ioctl_volread(cdi, argp);
3424 	case CDROMSTART:
3425 	case CDROMSTOP:
3426 	case CDROMPAUSE:
3427 	case CDROMRESUME:
3428 		return cdrom_ioctl_audioctl(cdi, cmd);
3429 	}
3430 
3431 	return -ENOSYS;
3432 }
3433 
3434 EXPORT_SYMBOL(cdrom_get_last_written);
3435 EXPORT_SYMBOL(register_cdrom);
3436 EXPORT_SYMBOL(unregister_cdrom);
3437 EXPORT_SYMBOL(cdrom_open);
3438 EXPORT_SYMBOL(cdrom_release);
3439 EXPORT_SYMBOL(cdrom_ioctl);
3440 EXPORT_SYMBOL(cdrom_number_of_slots);
3441 EXPORT_SYMBOL(cdrom_mode_select);
3442 EXPORT_SYMBOL(cdrom_mode_sense);
3443 EXPORT_SYMBOL(init_cdrom_command);
3444 EXPORT_SYMBOL(cdrom_get_media_event);
3445 
3446 #ifdef CONFIG_SYSCTL
3447 
3448 #define CDROM_STR_SIZE 1000
3449 
3450 static struct cdrom_sysctl_settings {
3451 	char	info[CDROM_STR_SIZE];	/* general info */
3452 	int	autoclose;		/* close tray upon mount, etc */
3453 	int	autoeject;		/* eject on umount */
3454 	int	debug;			/* turn on debugging messages */
3455 	int	lock;			/* lock the door on device open */
3456 	int	check;			/* check media type */
3457 } cdrom_sysctl_settings;
3458 
3459 enum cdrom_print_option {
3460 	CTL_NAME,
3461 	CTL_SPEED,
3462 	CTL_SLOTS,
3463 	CTL_CAPABILITY
3464 };
3465 
3466 static int cdrom_print_info(const char *header, int val, char *info,
3467 				int *pos, enum cdrom_print_option option)
3468 {
3469 	const int max_size = sizeof(cdrom_sysctl_settings.info);
3470 	struct cdrom_device_info *cdi;
3471 	int ret;
3472 
3473 	ret = scnprintf(info + *pos, max_size - *pos, header);
3474 	if (!ret)
3475 		return 1;
3476 
3477 	*pos += ret;
3478 
3479 	list_for_each_entry(cdi, &cdrom_list, list) {
3480 		switch (option) {
3481 		case CTL_NAME:
3482 			ret = scnprintf(info + *pos, max_size - *pos,
3483 					"\t%s", cdi->name);
3484 			break;
3485 		case CTL_SPEED:
3486 			ret = scnprintf(info + *pos, max_size - *pos,
3487 					"\t%d", cdi->speed);
3488 			break;
3489 		case CTL_SLOTS:
3490 			ret = scnprintf(info + *pos, max_size - *pos,
3491 					"\t%d", cdi->capacity);
3492 			break;
3493 		case CTL_CAPABILITY:
3494 			ret = scnprintf(info + *pos, max_size - *pos,
3495 					"\t%d", CDROM_CAN(val) != 0);
3496 			break;
3497 		default:
3498 			pr_info("invalid option%d\n", option);
3499 			return 1;
3500 		}
3501 		if (!ret)
3502 			return 1;
3503 		*pos += ret;
3504 	}
3505 
3506 	return 0;
3507 }
3508 
3509 static int cdrom_sysctl_info(struct ctl_table *ctl, int write,
3510                            void *buffer, size_t *lenp, loff_t *ppos)
3511 {
3512 	int pos;
3513 	char *info = cdrom_sysctl_settings.info;
3514 	const int max_size = sizeof(cdrom_sysctl_settings.info);
3515 
3516 	if (!*lenp || (*ppos && !write)) {
3517 		*lenp = 0;
3518 		return 0;
3519 	}
3520 
3521 	mutex_lock(&cdrom_mutex);
3522 
3523 	pos = sprintf(info, "CD-ROM information, " VERSION "\n");
3524 
3525 	if (cdrom_print_info("\ndrive name:\t", 0, info, &pos, CTL_NAME))
3526 		goto done;
3527 	if (cdrom_print_info("\ndrive speed:\t", 0, info, &pos, CTL_SPEED))
3528 		goto done;
3529 	if (cdrom_print_info("\ndrive # of slots:", 0, info, &pos, CTL_SLOTS))
3530 		goto done;
3531 	if (cdrom_print_info("\nCan close tray:\t",
3532 				CDC_CLOSE_TRAY, info, &pos, CTL_CAPABILITY))
3533 		goto done;
3534 	if (cdrom_print_info("\nCan open tray:\t",
3535 				CDC_OPEN_TRAY, info, &pos, CTL_CAPABILITY))
3536 		goto done;
3537 	if (cdrom_print_info("\nCan lock tray:\t",
3538 				CDC_LOCK, info, &pos, CTL_CAPABILITY))
3539 		goto done;
3540 	if (cdrom_print_info("\nCan change speed:",
3541 				CDC_SELECT_SPEED, info, &pos, CTL_CAPABILITY))
3542 		goto done;
3543 	if (cdrom_print_info("\nCan select disk:",
3544 				CDC_SELECT_DISC, info, &pos, CTL_CAPABILITY))
3545 		goto done;
3546 	if (cdrom_print_info("\nCan read multisession:",
3547 				CDC_MULTI_SESSION, info, &pos, CTL_CAPABILITY))
3548 		goto done;
3549 	if (cdrom_print_info("\nCan read MCN:\t",
3550 				CDC_MCN, info, &pos, CTL_CAPABILITY))
3551 		goto done;
3552 	if (cdrom_print_info("\nReports media changed:",
3553 				CDC_MEDIA_CHANGED, info, &pos, CTL_CAPABILITY))
3554 		goto done;
3555 	if (cdrom_print_info("\nCan play audio:\t",
3556 				CDC_PLAY_AUDIO, info, &pos, CTL_CAPABILITY))
3557 		goto done;
3558 	if (cdrom_print_info("\nCan write CD-R:\t",
3559 				CDC_CD_R, info, &pos, CTL_CAPABILITY))
3560 		goto done;
3561 	if (cdrom_print_info("\nCan write CD-RW:",
3562 				CDC_CD_RW, info, &pos, CTL_CAPABILITY))
3563 		goto done;
3564 	if (cdrom_print_info("\nCan read DVD:\t",
3565 				CDC_DVD, info, &pos, CTL_CAPABILITY))
3566 		goto done;
3567 	if (cdrom_print_info("\nCan write DVD-R:",
3568 				CDC_DVD_R, info, &pos, CTL_CAPABILITY))
3569 		goto done;
3570 	if (cdrom_print_info("\nCan write DVD-RAM:",
3571 				CDC_DVD_RAM, info, &pos, CTL_CAPABILITY))
3572 		goto done;
3573 	if (cdrom_print_info("\nCan read MRW:\t",
3574 				CDC_MRW, info, &pos, CTL_CAPABILITY))
3575 		goto done;
3576 	if (cdrom_print_info("\nCan write MRW:\t",
3577 				CDC_MRW_W, info, &pos, CTL_CAPABILITY))
3578 		goto done;
3579 	if (cdrom_print_info("\nCan write RAM:\t",
3580 				CDC_RAM, info, &pos, CTL_CAPABILITY))
3581 		goto done;
3582 	if (!scnprintf(info + pos, max_size - pos, "\n\n"))
3583 		goto done;
3584 doit:
3585 	mutex_unlock(&cdrom_mutex);
3586 	return proc_dostring(ctl, write, buffer, lenp, ppos);
3587 done:
3588 	pr_info("info buffer too small\n");
3589 	goto doit;
3590 }
3591 
3592 /* Unfortunately, per device settings are not implemented through
3593    procfs/sysctl yet. When they are, this will naturally disappear. For now
3594    just update all drives. Later this will become the template on which
3595    new registered drives will be based. */
3596 static void cdrom_update_settings(void)
3597 {
3598 	struct cdrom_device_info *cdi;
3599 
3600 	mutex_lock(&cdrom_mutex);
3601 	list_for_each_entry(cdi, &cdrom_list, list) {
3602 		if (autoclose && CDROM_CAN(CDC_CLOSE_TRAY))
3603 			cdi->options |= CDO_AUTO_CLOSE;
3604 		else if (!autoclose)
3605 			cdi->options &= ~CDO_AUTO_CLOSE;
3606 		if (autoeject && CDROM_CAN(CDC_OPEN_TRAY))
3607 			cdi->options |= CDO_AUTO_EJECT;
3608 		else if (!autoeject)
3609 			cdi->options &= ~CDO_AUTO_EJECT;
3610 		if (lockdoor && CDROM_CAN(CDC_LOCK))
3611 			cdi->options |= CDO_LOCK;
3612 		else if (!lockdoor)
3613 			cdi->options &= ~CDO_LOCK;
3614 		if (check_media_type)
3615 			cdi->options |= CDO_CHECK_TYPE;
3616 		else
3617 			cdi->options &= ~CDO_CHECK_TYPE;
3618 	}
3619 	mutex_unlock(&cdrom_mutex);
3620 }
3621 
3622 static int cdrom_sysctl_handler(struct ctl_table *ctl, int write,
3623 				void *buffer, size_t *lenp, loff_t *ppos)
3624 {
3625 	int ret;
3626 
3627 	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
3628 
3629 	if (write) {
3630 
3631 		/* we only care for 1 or 0. */
3632 		autoclose        = !!cdrom_sysctl_settings.autoclose;
3633 		autoeject        = !!cdrom_sysctl_settings.autoeject;
3634 		debug	         = !!cdrom_sysctl_settings.debug;
3635 		lockdoor         = !!cdrom_sysctl_settings.lock;
3636 		check_media_type = !!cdrom_sysctl_settings.check;
3637 
3638 		/* update the option flags according to the changes. we
3639 		   don't have per device options through sysctl yet,
3640 		   but we will have and then this will disappear. */
3641 		cdrom_update_settings();
3642 	}
3643 
3644         return ret;
3645 }
3646 
3647 /* Place files in /proc/sys/dev/cdrom */
3648 static struct ctl_table cdrom_table[] = {
3649 	{
3650 		.procname	= "info",
3651 		.data		= &cdrom_sysctl_settings.info,
3652 		.maxlen		= CDROM_STR_SIZE,
3653 		.mode		= 0444,
3654 		.proc_handler	= cdrom_sysctl_info,
3655 	},
3656 	{
3657 		.procname	= "autoclose",
3658 		.data		= &cdrom_sysctl_settings.autoclose,
3659 		.maxlen		= sizeof(int),
3660 		.mode		= 0644,
3661 		.proc_handler	= cdrom_sysctl_handler,
3662 	},
3663 	{
3664 		.procname	= "autoeject",
3665 		.data		= &cdrom_sysctl_settings.autoeject,
3666 		.maxlen		= sizeof(int),
3667 		.mode		= 0644,
3668 		.proc_handler	= cdrom_sysctl_handler,
3669 	},
3670 	{
3671 		.procname	= "debug",
3672 		.data		= &cdrom_sysctl_settings.debug,
3673 		.maxlen		= sizeof(int),
3674 		.mode		= 0644,
3675 		.proc_handler	= cdrom_sysctl_handler,
3676 	},
3677 	{
3678 		.procname	= "lock",
3679 		.data		= &cdrom_sysctl_settings.lock,
3680 		.maxlen		= sizeof(int),
3681 		.mode		= 0644,
3682 		.proc_handler	= cdrom_sysctl_handler,
3683 	},
3684 	{
3685 		.procname	= "check_media",
3686 		.data		= &cdrom_sysctl_settings.check,
3687 		.maxlen		= sizeof(int),
3688 		.mode		= 0644,
3689 		.proc_handler	= cdrom_sysctl_handler
3690 	},
3691 	{ }
3692 };
3693 static struct ctl_table_header *cdrom_sysctl_header;
3694 
3695 static void cdrom_sysctl_register(void)
3696 {
3697 	static atomic_t initialized = ATOMIC_INIT(0);
3698 
3699 	if (!atomic_add_unless(&initialized, 1, 1))
3700 		return;
3701 
3702 	cdrom_sysctl_header = register_sysctl("dev/cdrom", cdrom_table);
3703 
3704 	/* set the defaults */
3705 	cdrom_sysctl_settings.autoclose = autoclose;
3706 	cdrom_sysctl_settings.autoeject = autoeject;
3707 	cdrom_sysctl_settings.debug = debug;
3708 	cdrom_sysctl_settings.lock = lockdoor;
3709 	cdrom_sysctl_settings.check = check_media_type;
3710 }
3711 
3712 static void cdrom_sysctl_unregister(void)
3713 {
3714 	if (cdrom_sysctl_header)
3715 		unregister_sysctl_table(cdrom_sysctl_header);
3716 }
3717 
3718 #else /* CONFIG_SYSCTL */
3719 
3720 static void cdrom_sysctl_register(void)
3721 {
3722 }
3723 
3724 static void cdrom_sysctl_unregister(void)
3725 {
3726 }
3727 
3728 #endif /* CONFIG_SYSCTL */
3729 
3730 static int __init cdrom_init(void)
3731 {
3732 	cdrom_sysctl_register();
3733 
3734 	return 0;
3735 }
3736 
3737 static void __exit cdrom_exit(void)
3738 {
3739 	pr_info("Uniform CD-ROM driver unloaded\n");
3740 	cdrom_sysctl_unregister();
3741 }
3742 
3743 module_init(cdrom_init);
3744 module_exit(cdrom_exit);
3745 MODULE_LICENSE("GPL");
3746