Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6
[linux-2.6] / drivers / cdrom / cdrom.c
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.tex 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 activly
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 REVISION "Revision: 3.20"
246 #define VERSION "Id: cdrom.c 3.20 2003/12/17"
247
248 /* I use an error-log mask to give fine grain control over the type of
249    messages dumped to the system logs.  The available masks include: */
250 #define CD_NOTHING      0x0
251 #define CD_WARNING      0x1
252 #define CD_REG_UNREG    0x2
253 #define CD_DO_IOCTL     0x4
254 #define CD_OPEN         0x8
255 #define CD_CLOSE        0x10
256 #define CD_COUNT_TRACKS 0x20
257 #define CD_CHANGER      0x40
258 #define CD_DVD          0x80
259
260 /* Define this to remove _all_ the debugging messages */
261 /* #define ERRLOGMASK CD_NOTHING */
262 #define ERRLOGMASK CD_WARNING
263 /* #define ERRLOGMASK (CD_WARNING|CD_OPEN|CD_COUNT_TRACKS|CD_CLOSE) */
264 /* #define ERRLOGMASK (CD_WARNING|CD_REG_UNREG|CD_DO_IOCTL|CD_OPEN|CD_CLOSE|CD_COUNT_TRACKS) */
265
266 #include <linux/config.h>
267 #include <linux/module.h>
268 #include <linux/fs.h>
269 #include <linux/buffer_head.h>
270 #include <linux/major.h>
271 #include <linux/types.h>
272 #include <linux/errno.h>
273 #include <linux/kernel.h>
274 #include <linux/mm.h>
275 #include <linux/slab.h> 
276 #include <linux/cdrom.h>
277 #include <linux/sysctl.h>
278 #include <linux/proc_fs.h>
279 #include <linux/blkpg.h>
280 #include <linux/init.h>
281 #include <linux/fcntl.h>
282 #include <linux/blkdev.h>
283 #include <linux/times.h>
284
285 #include <asm/uaccess.h>
286
287 /* used to tell the module to turn on full debugging messages */
288 static int debug;
289 /* used to keep tray locked at all times */
290 static int keeplocked;
291 /* default compatibility mode */
292 static int autoclose=1;
293 static int autoeject;
294 static int lockdoor = 1;
295 /* will we ever get to use this... sigh. */
296 static int check_media_type;
297 /* automatically restart mrw format */
298 static int mrw_format_restart = 1;
299 module_param(debug, bool, 0);
300 module_param(autoclose, bool, 0);
301 module_param(autoeject, bool, 0);
302 module_param(lockdoor, bool, 0);
303 module_param(check_media_type, bool, 0);
304 module_param(mrw_format_restart, bool, 0);
305
306 static DEFINE_SPINLOCK(cdrom_lock);
307
308 static const char *mrw_format_status[] = {
309         "not mrw",
310         "bgformat inactive",
311         "bgformat active",
312         "mrw complete",
313 };
314
315 static const char *mrw_address_space[] = { "DMA", "GAA" };
316
317 #if (ERRLOGMASK!=CD_NOTHING)
318 #define cdinfo(type, fmt, args...) \
319         if ((ERRLOGMASK & type) || debug==1 ) \
320             printk(KERN_INFO "cdrom: " fmt, ## args)
321 #else
322 #define cdinfo(type, fmt, args...) 
323 #endif
324
325 /* These are used to simplify getting data in from and back to user land */
326 #define IOCTL_IN(arg, type, in)                                 \
327         if (copy_from_user(&(in), (type __user *) (arg), sizeof (in)))  \
328                 return -EFAULT;
329
330 #define IOCTL_OUT(arg, type, out) \
331         if (copy_to_user((type __user *) (arg), &(out), sizeof (out)))  \
332                 return -EFAULT;
333
334 /* The (cdo->capability & ~cdi->mask & CDC_XXX) construct was used in
335    a lot of places. This macro makes the code more clear. */
336 #define CDROM_CAN(type) (cdi->ops->capability & ~cdi->mask & (type))
337
338 /* used in the audio ioctls */
339 #define CHECKAUDIO if ((ret=check_for_audio_disc(cdi, cdo))) return ret
340
341 /* Not-exported routines. */
342 static int open_for_data(struct cdrom_device_info * cdi);
343 static int check_for_audio_disc(struct cdrom_device_info * cdi,
344                          struct cdrom_device_ops * cdo);
345 static void sanitize_format(union cdrom_addr *addr, 
346                 u_char * curr, u_char requested);
347 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
348                      unsigned long arg);
349
350 int cdrom_get_last_written(struct cdrom_device_info *, long *);
351 static int cdrom_get_next_writable(struct cdrom_device_info *, long *);
352 static void cdrom_count_tracks(struct cdrom_device_info *, tracktype*);
353
354 static int cdrom_mrw_exit(struct cdrom_device_info *cdi);
355
356 static int cdrom_get_disc_info(struct cdrom_device_info *cdi, disc_information *di);
357
358 #ifdef CONFIG_SYSCTL
359 static void cdrom_sysctl_register(void);
360 #endif /* CONFIG_SYSCTL */ 
361 static struct cdrom_device_info *topCdromPtr;
362
363 static int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
364                                       struct packet_command *cgc)
365 {
366         if (cgc->sense) {
367                 cgc->sense->sense_key = 0x05;
368                 cgc->sense->asc = 0x20;
369                 cgc->sense->ascq = 0x00;
370         }
371
372         cgc->stat = -EIO;
373         return -EIO;
374 }
375
376 /* This macro makes sure we don't have to check on cdrom_device_ops
377  * existence in the run-time routines below. Change_capability is a
378  * hack to have the capability flags defined const, while we can still
379  * change it here without gcc complaining at every line.
380  */
381 #define ENSURE(call, bits) if (cdo->call == NULL) *change_capability &= ~(bits)
382
383 int register_cdrom(struct cdrom_device_info *cdi)
384 {
385         static char banner_printed;
386         struct cdrom_device_ops *cdo = cdi->ops;
387         int *change_capability = (int *)&cdo->capability; /* hack */
388
389         cdinfo(CD_OPEN, "entering register_cdrom\n"); 
390
391         if (cdo->open == NULL || cdo->release == NULL)
392                 return -2;
393         if (!banner_printed) {
394                 printk(KERN_INFO "Uniform CD-ROM driver " REVISION "\n");
395                 banner_printed = 1;
396 #ifdef CONFIG_SYSCTL
397                 cdrom_sysctl_register();
398 #endif /* CONFIG_SYSCTL */ 
399         }
400
401         ENSURE(drive_status, CDC_DRIVE_STATUS );
402         ENSURE(media_changed, CDC_MEDIA_CHANGED);
403         ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
404         ENSURE(lock_door, CDC_LOCK);
405         ENSURE(select_speed, CDC_SELECT_SPEED);
406         ENSURE(get_last_session, CDC_MULTI_SESSION);
407         ENSURE(get_mcn, CDC_MCN);
408         ENSURE(reset, CDC_RESET);
409         ENSURE(audio_ioctl, CDC_PLAY_AUDIO);
410         ENSURE(dev_ioctl, CDC_IOCTLS);
411         ENSURE(generic_packet, CDC_GENERIC_PACKET);
412         cdi->mc_flags = 0;
413         cdo->n_minors = 0;
414         cdi->options = CDO_USE_FFLAGS;
415         
416         if (autoclose==1 && CDROM_CAN(CDC_CLOSE_TRAY))
417                 cdi->options |= (int) CDO_AUTO_CLOSE;
418         if (autoeject==1 && CDROM_CAN(CDC_OPEN_TRAY))
419                 cdi->options |= (int) CDO_AUTO_EJECT;
420         if (lockdoor==1)
421                 cdi->options |= (int) CDO_LOCK;
422         if (check_media_type==1)
423                 cdi->options |= (int) CDO_CHECK_TYPE;
424
425         if (CDROM_CAN(CDC_MRW_W))
426                 cdi->exit = cdrom_mrw_exit;
427
428         if (cdi->disk)
429                 cdi->cdda_method = CDDA_BPC_FULL;
430         else
431                 cdi->cdda_method = CDDA_OLD;
432
433         if (!cdo->generic_packet)
434                 cdo->generic_packet = cdrom_dummy_generic_packet;
435
436         cdinfo(CD_REG_UNREG, "drive \"/dev/%s\" registered\n", cdi->name);
437         spin_lock(&cdrom_lock);
438         cdi->next = topCdromPtr;        
439         topCdromPtr = cdi;
440         spin_unlock(&cdrom_lock);
441         return 0;
442 }
443 #undef ENSURE
444
445 int unregister_cdrom(struct cdrom_device_info *unreg)
446 {
447         struct cdrom_device_info *cdi, *prev;
448         cdinfo(CD_OPEN, "entering unregister_cdrom\n"); 
449
450         prev = NULL;
451         spin_lock(&cdrom_lock);
452         cdi = topCdromPtr;
453         while (cdi && cdi != unreg) {
454                 prev = cdi;
455                 cdi = cdi->next;
456         }
457
458         if (cdi == NULL) {
459                 spin_unlock(&cdrom_lock);
460                 return -2;
461         }
462         if (prev)
463                 prev->next = cdi->next;
464         else
465                 topCdromPtr = cdi->next;
466
467         spin_unlock(&cdrom_lock);
468
469         if (cdi->exit)
470                 cdi->exit(cdi);
471
472         cdi->ops->n_minors--;
473         cdinfo(CD_REG_UNREG, "drive \"/dev/%s\" unregistered\n", cdi->name);
474         return 0;
475 }
476
477 int cdrom_get_media_event(struct cdrom_device_info *cdi,
478                           struct media_event_desc *med)
479 {
480         struct packet_command cgc;
481         unsigned char buffer[8];
482         struct event_header *eh = (struct event_header *) buffer;
483
484         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
485         cgc.cmd[0] = GPCMD_GET_EVENT_STATUS_NOTIFICATION;
486         cgc.cmd[1] = 1;         /* IMMED */
487         cgc.cmd[4] = 1 << 4;    /* media event */
488         cgc.cmd[8] = sizeof(buffer);
489         cgc.quiet = 1;
490
491         if (cdi->ops->generic_packet(cdi, &cgc))
492                 return 1;
493
494         if (be16_to_cpu(eh->data_len) < sizeof(*med))
495                 return 1;
496
497         if (eh->nea || eh->notification_class != 0x4)
498                 return 1;
499
500         memcpy(med, &buffer[sizeof(*eh)], sizeof(*med));
501         return 0;
502 }
503
504 /*
505  * the first prototypes used 0x2c as the page code for the mrw mode page,
506  * subsequently this was changed to 0x03. probe the one used by this drive
507  */
508 static int cdrom_mrw_probe_pc(struct cdrom_device_info *cdi)
509 {
510         struct packet_command cgc;
511         char buffer[16];
512
513         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
514
515         cgc.timeout = HZ;
516         cgc.quiet = 1;
517
518         if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC, 0)) {
519                 cdi->mrw_mode_page = MRW_MODE_PC;
520                 return 0;
521         } else if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC_PRE1, 0)) {
522                 cdi->mrw_mode_page = MRW_MODE_PC_PRE1;
523                 return 0;
524         }
525
526         return 1;
527 }
528
529 static int cdrom_is_mrw(struct cdrom_device_info *cdi, int *write)
530 {
531         struct packet_command cgc;
532         struct mrw_feature_desc *mfd;
533         unsigned char buffer[16];
534         int ret;
535
536         *write = 0;
537
538         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
539
540         cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
541         cgc.cmd[3] = CDF_MRW;
542         cgc.cmd[8] = sizeof(buffer);
543         cgc.quiet = 1;
544
545         if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
546                 return ret;
547
548         mfd = (struct mrw_feature_desc *)&buffer[sizeof(struct feature_header)];
549         if (be16_to_cpu(mfd->feature_code) != CDF_MRW)
550                 return 1;
551         *write = mfd->write;
552
553         if ((ret = cdrom_mrw_probe_pc(cdi))) {
554                 *write = 0;
555                 return ret;
556         }
557
558         return 0;
559 }
560
561 static int cdrom_mrw_bgformat(struct cdrom_device_info *cdi, int cont)
562 {
563         struct packet_command cgc;
564         unsigned char buffer[12];
565         int ret;
566
567         printk(KERN_INFO "cdrom: %sstarting format\n", cont ? "Re" : "");
568
569         /*
570          * FmtData bit set (bit 4), format type is 1
571          */
572         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_WRITE);
573         cgc.cmd[0] = GPCMD_FORMAT_UNIT;
574         cgc.cmd[1] = (1 << 4) | 1;
575
576         cgc.timeout = 5 * 60 * HZ;
577
578         /*
579          * 4 byte format list header, 8 byte format list descriptor
580          */
581         buffer[1] = 1 << 1;
582         buffer[3] = 8;
583
584         /*
585          * nr_blocks field
586          */
587         buffer[4] = 0xff;
588         buffer[5] = 0xff;
589         buffer[6] = 0xff;
590         buffer[7] = 0xff;
591
592         buffer[8] = 0x24 << 2;
593         buffer[11] = cont;
594
595         ret = cdi->ops->generic_packet(cdi, &cgc);
596         if (ret)
597                 printk(KERN_INFO "cdrom: bgformat failed\n");
598
599         return ret;
600 }
601
602 static int cdrom_mrw_bgformat_susp(struct cdrom_device_info *cdi, int immed)
603 {
604         struct packet_command cgc;
605
606         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
607         cgc.cmd[0] = GPCMD_CLOSE_TRACK;
608
609         /*
610          * Session = 1, Track = 0
611          */
612         cgc.cmd[1] = !!immed;
613         cgc.cmd[2] = 1 << 1;
614
615         cgc.timeout = 5 * 60 * HZ;
616
617         return cdi->ops->generic_packet(cdi, &cgc);
618 }
619
620 static int cdrom_flush_cache(struct cdrom_device_info *cdi)
621 {
622         struct packet_command cgc;
623
624         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
625         cgc.cmd[0] = GPCMD_FLUSH_CACHE;
626
627         cgc.timeout = 5 * 60 * HZ;
628
629         return cdi->ops->generic_packet(cdi, &cgc);
630 }
631
632 static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
633 {
634         disc_information di;
635         int ret;
636
637         ret = cdrom_get_disc_info(cdi, &di);
638         if (ret < 0 || ret < (int)offsetof(typeof(di),disc_type))
639                 return 1;
640
641         ret = 0;
642         if (di.mrw_status == CDM_MRW_BGFORMAT_ACTIVE) {
643                 printk(KERN_INFO "cdrom: issuing MRW back ground "
644                                 "format suspend\n");
645                 ret = cdrom_mrw_bgformat_susp(cdi, 0);
646         }
647
648         if (!ret && cdi->media_written)
649                 ret = cdrom_flush_cache(cdi);
650
651         return ret;
652 }
653
654 static int cdrom_mrw_set_lba_space(struct cdrom_device_info *cdi, int space)
655 {
656         struct packet_command cgc;
657         struct mode_page_header *mph;
658         char buffer[16];
659         int ret, offset, size;
660
661         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
662
663         cgc.buffer = buffer;
664         cgc.buflen = sizeof(buffer);
665
666         if ((ret = cdrom_mode_sense(cdi, &cgc, cdi->mrw_mode_page, 0)))
667                 return ret;
668
669         mph = (struct mode_page_header *) buffer;
670         offset = be16_to_cpu(mph->desc_length);
671         size = be16_to_cpu(mph->mode_data_length) + 2;
672
673         buffer[offset + 3] = space;
674         cgc.buflen = size;
675
676         if ((ret = cdrom_mode_select(cdi, &cgc)))
677                 return ret;
678
679         printk(KERN_INFO "cdrom: %s: mrw address space %s selected\n", cdi->name, mrw_address_space[space]);
680         return 0;
681 }
682
683 static int cdrom_get_random_writable(struct cdrom_device_info *cdi,
684                               struct rwrt_feature_desc *rfd)
685 {
686         struct packet_command cgc;
687         char buffer[24];
688         int ret;
689
690         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
691
692         cgc.cmd[0] = GPCMD_GET_CONFIGURATION;   /* often 0x46 */
693         cgc.cmd[3] = CDF_RWRT;                  /* often 0x0020 */
694         cgc.cmd[8] = sizeof(buffer);            /* often 0x18 */
695         cgc.quiet = 1;
696
697         if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
698                 return ret;
699
700         memcpy(rfd, &buffer[sizeof(struct feature_header)], sizeof (*rfd));
701         return 0;
702 }
703
704 static int cdrom_has_defect_mgt(struct cdrom_device_info *cdi)
705 {
706         struct packet_command cgc;
707         char buffer[16];
708         __u16 *feature_code;
709         int ret;
710
711         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
712
713         cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
714         cgc.cmd[3] = CDF_HWDM;
715         cgc.cmd[8] = sizeof(buffer);
716         cgc.quiet = 1;
717
718         if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
719                 return ret;
720
721         feature_code = (__u16 *) &buffer[sizeof(struct feature_header)];
722         if (be16_to_cpu(*feature_code) == CDF_HWDM)
723                 return 0;
724
725         return 1;
726 }
727
728
729 static int cdrom_is_random_writable(struct cdrom_device_info *cdi, int *write)
730 {
731         struct rwrt_feature_desc rfd;
732         int ret;
733
734         *write = 0;
735
736         if ((ret = cdrom_get_random_writable(cdi, &rfd)))
737                 return ret;
738
739         if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
740                 *write = 1;
741
742         return 0;
743 }
744
745 static int cdrom_media_erasable(struct cdrom_device_info *cdi)
746 {
747         disc_information di;
748         int ret;
749
750         ret = cdrom_get_disc_info(cdi, &di);
751         if (ret < 0 || ret < offsetof(typeof(di), n_first_track))
752                 return -1;
753
754         return di.erasable;
755 }
756
757 /*
758  * FIXME: check RO bit
759  */
760 static int cdrom_dvdram_open_write(struct cdrom_device_info *cdi)
761 {
762         int ret = cdrom_media_erasable(cdi);
763
764         /*
765          * allow writable open if media info read worked and media is
766          * erasable, _or_ if it fails since not all drives support it
767          */
768         if (!ret)
769                 return 1;
770
771         return 0;
772 }
773
774 static int cdrom_mrw_open_write(struct cdrom_device_info *cdi)
775 {
776         disc_information di;
777         int ret;
778
779         /*
780          * always reset to DMA lba space on open
781          */
782         if (cdrom_mrw_set_lba_space(cdi, MRW_LBA_DMA)) {
783                 printk(KERN_ERR "cdrom: failed setting lba address space\n");
784                 return 1;
785         }
786
787         ret = cdrom_get_disc_info(cdi, &di);
788         if (ret < 0 || ret < offsetof(typeof(di),disc_type))
789                 return 1;
790
791         if (!di.erasable)
792                 return 1;
793
794         /*
795          * mrw_status
796          * 0    -       not MRW formatted
797          * 1    -       MRW bgformat started, but not running or complete
798          * 2    -       MRW bgformat in progress
799          * 3    -       MRW formatting complete
800          */
801         ret = 0;
802         printk(KERN_INFO "cdrom open: mrw_status '%s'\n",
803                         mrw_format_status[di.mrw_status]);
804         if (!di.mrw_status)
805                 ret = 1;
806         else if (di.mrw_status == CDM_MRW_BGFORMAT_INACTIVE &&
807                         mrw_format_restart)
808                 ret = cdrom_mrw_bgformat(cdi, 1);
809
810         return ret;
811 }
812
813 static int mo_open_write(struct cdrom_device_info *cdi)
814 {
815         struct packet_command cgc;
816         char buffer[255];
817         int ret;
818
819         init_cdrom_command(&cgc, &buffer, 4, CGC_DATA_READ);
820         cgc.quiet = 1;
821
822         /*
823          * obtain write protect information as per
824          * drivers/scsi/sd.c:sd_read_write_protect_flag
825          */
826
827         ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
828         if (ret)
829                 ret = cdrom_mode_sense(cdi, &cgc, GPMODE_VENDOR_PAGE, 0);
830         if (ret) {
831                 cgc.buflen = 255;
832                 ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
833         }
834
835         /* drive gave us no info, let the user go ahead */
836         if (ret)
837                 return 0;
838
839         return buffer[3] & 0x80;
840 }
841
842 static int cdrom_ram_open_write(struct cdrom_device_info *cdi)
843 {
844         struct rwrt_feature_desc rfd;
845         int ret;
846
847         if ((ret = cdrom_has_defect_mgt(cdi)))
848                 return ret;
849
850         if ((ret = cdrom_get_random_writable(cdi, &rfd)))
851                 return ret;
852         else if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
853                 ret = !rfd.curr;
854
855         cdinfo(CD_OPEN, "can open for random write\n");
856         return ret;
857 }
858
859 static void cdrom_mmc3_profile(struct cdrom_device_info *cdi)
860 {
861         struct packet_command cgc;
862         char buffer[32];
863         int ret, mmc3_profile;
864
865         init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
866
867         cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
868         cgc.cmd[1] = 0;
869         cgc.cmd[2] = cgc.cmd[3] = 0;            /* Starting Feature Number */
870         cgc.cmd[8] = sizeof(buffer);            /* Allocation Length */
871         cgc.quiet = 1;
872
873         if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
874                 mmc3_profile = 0xffff;
875         else
876                 mmc3_profile = (buffer[6] << 8) | buffer[7];
877
878         cdi->mmc3_profile = mmc3_profile;
879 }
880
881 static int cdrom_is_dvd_rw(struct cdrom_device_info *cdi)
882 {
883         switch (cdi->mmc3_profile) {
884         case 0x12:      /* DVD-RAM      */
885         case 0x1A:      /* DVD+RW       */
886                 return 0;
887         default:
888                 return 1;
889         }
890 }
891
892 /*
893  * returns 0 for ok to open write, non-0 to disallow
894  */
895 static int cdrom_open_write(struct cdrom_device_info *cdi)
896 {
897         int mrw, mrw_write, ram_write;
898         int ret = 1;
899
900         mrw = 0;
901         if (!cdrom_is_mrw(cdi, &mrw_write))
902                 mrw = 1;
903
904         if (CDROM_CAN(CDC_MO_DRIVE))
905                 ram_write = 1;
906         else
907                 (void) cdrom_is_random_writable(cdi, &ram_write);
908         
909         if (mrw)
910                 cdi->mask &= ~CDC_MRW;
911         else
912                 cdi->mask |= CDC_MRW;
913
914         if (mrw_write)
915                 cdi->mask &= ~CDC_MRW_W;
916         else
917                 cdi->mask |= CDC_MRW_W;
918
919         if (ram_write)
920                 cdi->mask &= ~CDC_RAM;
921         else
922                 cdi->mask |= CDC_RAM;
923
924         if (CDROM_CAN(CDC_MRW_W))
925                 ret = cdrom_mrw_open_write(cdi);
926         else if (CDROM_CAN(CDC_DVD_RAM))
927                 ret = cdrom_dvdram_open_write(cdi);
928         else if (CDROM_CAN(CDC_RAM) &&
929                  !CDROM_CAN(CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_MRW|CDC_MO_DRIVE))
930                 ret = cdrom_ram_open_write(cdi);
931         else if (CDROM_CAN(CDC_MO_DRIVE))
932                 ret = mo_open_write(cdi);
933         else if (!cdrom_is_dvd_rw(cdi))
934                 ret = 0;
935
936         return ret;
937 }
938
939 static void cdrom_dvd_rw_close_write(struct cdrom_device_info *cdi)
940 {
941         struct packet_command cgc;
942
943         if (cdi->mmc3_profile != 0x1a) {
944                 cdinfo(CD_CLOSE, "%s: No DVD+RW\n", cdi->name);
945                 return;
946         }
947
948         if (!cdi->media_written) {
949                 cdinfo(CD_CLOSE, "%s: DVD+RW media clean\n", cdi->name);
950                 return;
951         }
952
953         printk(KERN_INFO "cdrom: %s: dirty DVD+RW media, \"finalizing\"\n",
954                cdi->name);
955
956         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
957         cgc.cmd[0] = GPCMD_FLUSH_CACHE;
958         cgc.timeout = 30*HZ;
959         cdi->ops->generic_packet(cdi, &cgc);
960
961         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
962         cgc.cmd[0] = GPCMD_CLOSE_TRACK;
963         cgc.timeout = 3000*HZ;
964         cgc.quiet = 1;
965         cdi->ops->generic_packet(cdi, &cgc);
966
967         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
968         cgc.cmd[0] = GPCMD_CLOSE_TRACK;
969         cgc.cmd[2] = 2;  /* Close session */
970         cgc.quiet = 1;
971         cgc.timeout = 3000*HZ;
972         cdi->ops->generic_packet(cdi, &cgc);
973
974         cdi->media_written = 0;
975 }
976
977 static int cdrom_close_write(struct cdrom_device_info *cdi)
978 {
979 #if 0
980         return cdrom_flush_cache(cdi);
981 #else
982         return 0;
983 #endif
984 }
985
986 /* We use the open-option O_NONBLOCK to indicate that the
987  * purpose of opening is only for subsequent ioctl() calls; no device
988  * integrity checks are performed.
989  *
990  * We hope that all cd-player programs will adopt this convention. It
991  * is in their own interest: device control becomes a lot easier
992  * this way.
993  */
994 int cdrom_open(struct cdrom_device_info *cdi, struct inode *ip, struct file *fp)
995 {
996         int ret;
997
998         cdinfo(CD_OPEN, "entering cdrom_open\n"); 
999
1000         /* if this was a O_NONBLOCK open and we should honor the flags,
1001          * do a quick open without drive/disc integrity checks. */
1002         cdi->use_count++;
1003         if ((fp->f_flags & O_NONBLOCK) && (cdi->options & CDO_USE_FFLAGS)) {
1004                 ret = cdi->ops->open(cdi, 1);
1005         } else {
1006                 ret = open_for_data(cdi);
1007                 if (ret)
1008                         goto err;
1009                 cdrom_mmc3_profile(cdi);
1010                 if (fp->f_mode & FMODE_WRITE) {
1011                         ret = -EROFS;
1012                         if (cdrom_open_write(cdi))
1013                                 goto err;
1014                         if (!CDROM_CAN(CDC_RAM))
1015                                 goto err;
1016                         ret = 0;
1017                         cdi->media_written = 0;
1018                 }
1019         }
1020
1021         if (ret)
1022                 goto err;
1023
1024         cdinfo(CD_OPEN, "Use count for \"/dev/%s\" now %d\n",
1025                         cdi->name, cdi->use_count);
1026         /* Do this on open.  Don't wait for mount, because they might
1027             not be mounting, but opening with O_NONBLOCK */
1028         check_disk_change(ip->i_bdev);
1029         return 0;
1030 err:
1031         cdi->use_count--;
1032         return ret;
1033 }
1034
1035 static
1036 int open_for_data(struct cdrom_device_info * cdi)
1037 {
1038         int ret;
1039         struct cdrom_device_ops *cdo = cdi->ops;
1040         tracktype tracks;
1041         cdinfo(CD_OPEN, "entering open_for_data\n");
1042         /* Check if the driver can report drive status.  If it can, we
1043            can do clever things.  If it can't, well, we at least tried! */
1044         if (cdo->drive_status != NULL) {
1045                 ret = cdo->drive_status(cdi, CDSL_CURRENT);
1046                 cdinfo(CD_OPEN, "drive_status=%d\n", ret); 
1047                 if (ret == CDS_TRAY_OPEN) {
1048                         cdinfo(CD_OPEN, "the tray is open...\n"); 
1049                         /* can/may i close it? */
1050                         if (CDROM_CAN(CDC_CLOSE_TRAY) &&
1051                             cdi->options & CDO_AUTO_CLOSE) {
1052                                 cdinfo(CD_OPEN, "trying to close the tray.\n"); 
1053                                 ret=cdo->tray_move(cdi,0);
1054                                 if (ret) {
1055                                         cdinfo(CD_OPEN, "bummer. tried to close the tray but failed.\n"); 
1056                                         /* Ignore the error from the low
1057                                         level driver.  We don't care why it
1058                                         couldn't close the tray.  We only care 
1059                                         that there is no disc in the drive, 
1060                                         since that is the _REAL_ problem here.*/
1061                                         ret=-ENOMEDIUM;
1062                                         goto clean_up_and_return;
1063                                 }
1064                         } else {
1065                                 cdinfo(CD_OPEN, "bummer. this drive can't close the tray.\n"); 
1066                                 ret=-ENOMEDIUM;
1067                                 goto clean_up_and_return;
1068                         }
1069                         /* Ok, the door should be closed now.. Check again */
1070                         ret = cdo->drive_status(cdi, CDSL_CURRENT);
1071                         if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
1072                                 cdinfo(CD_OPEN, "bummer. the tray is still not closed.\n"); 
1073                                 cdinfo(CD_OPEN, "tray might not contain a medium.\n");
1074                                 ret=-ENOMEDIUM;
1075                                 goto clean_up_and_return;
1076                         }
1077                         cdinfo(CD_OPEN, "the tray is now closed.\n"); 
1078                 }
1079                 /* the door should be closed now, check for the disc */
1080                 ret = cdo->drive_status(cdi, CDSL_CURRENT);
1081                 if (ret!=CDS_DISC_OK) {
1082                         ret = -ENOMEDIUM;
1083                         goto clean_up_and_return;
1084                 }
1085         }
1086         cdrom_count_tracks(cdi, &tracks);
1087         if (tracks.error == CDS_NO_DISC) {
1088                 cdinfo(CD_OPEN, "bummer. no disc.\n");
1089                 ret=-ENOMEDIUM;
1090                 goto clean_up_and_return;
1091         }
1092         /* CD-Players which don't use O_NONBLOCK, workman
1093          * for example, need bit CDO_CHECK_TYPE cleared! */
1094         if (tracks.data==0) {
1095                 if (cdi->options & CDO_CHECK_TYPE) {
1096                     /* give people a warning shot, now that CDO_CHECK_TYPE
1097                        is the default case! */
1098                     cdinfo(CD_OPEN, "bummer. wrong media type.\n"); 
1099                     cdinfo(CD_WARNING, "pid %d must open device O_NONBLOCK!\n",
1100                                         (unsigned int)current->pid); 
1101                     ret=-EMEDIUMTYPE;
1102                     goto clean_up_and_return;
1103                 }
1104                 else {
1105                     cdinfo(CD_OPEN, "wrong media type, but CDO_CHECK_TYPE not set.\n");
1106                 }
1107         }
1108
1109         cdinfo(CD_OPEN, "all seems well, opening the device.\n"); 
1110
1111         /* all seems well, we can open the device */
1112         ret = cdo->open(cdi, 0); /* open for data */
1113         cdinfo(CD_OPEN, "opening the device gave me %d.\n", ret); 
1114         /* After all this careful checking, we shouldn't have problems
1115            opening the device, but we don't want the device locked if 
1116            this somehow fails... */
1117         if (ret) {
1118                 cdinfo(CD_OPEN, "open device failed.\n"); 
1119                 goto clean_up_and_return;
1120         }
1121         if (CDROM_CAN(CDC_LOCK) && (cdi->options & CDO_LOCK)) {
1122                         cdo->lock_door(cdi, 1);
1123                         cdinfo(CD_OPEN, "door locked.\n");
1124         }
1125         cdinfo(CD_OPEN, "device opened successfully.\n"); 
1126         return ret;
1127
1128         /* Something failed.  Try to unlock the drive, because some drivers
1129         (notably ide-cd) lock the drive after every command.  This produced
1130         a nasty bug where after mount failed, the drive would remain locked!  
1131         This ensures that the drive gets unlocked after a mount fails.  This 
1132         is a goto to avoid bloating the driver with redundant code. */ 
1133 clean_up_and_return:
1134         cdinfo(CD_WARNING, "open failed.\n"); 
1135         if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
1136                         cdo->lock_door(cdi, 0);
1137                         cdinfo(CD_OPEN, "door unlocked.\n");
1138         }
1139         return ret;
1140 }
1141
1142 /* This code is similar to that in open_for_data. The routine is called
1143    whenever an audio play operation is requested.
1144 */
1145 int check_for_audio_disc(struct cdrom_device_info * cdi,
1146                          struct cdrom_device_ops * cdo)
1147 {
1148         int ret;
1149         tracktype tracks;
1150         cdinfo(CD_OPEN, "entering check_for_audio_disc\n");
1151         if (!(cdi->options & CDO_CHECK_TYPE))
1152                 return 0;
1153         if (cdo->drive_status != NULL) {
1154                 ret = cdo->drive_status(cdi, CDSL_CURRENT);
1155                 cdinfo(CD_OPEN, "drive_status=%d\n", ret); 
1156                 if (ret == CDS_TRAY_OPEN) {
1157                         cdinfo(CD_OPEN, "the tray is open...\n"); 
1158                         /* can/may i close it? */
1159                         if (CDROM_CAN(CDC_CLOSE_TRAY) &&
1160                             cdi->options & CDO_AUTO_CLOSE) {
1161                                 cdinfo(CD_OPEN, "trying to close the tray.\n"); 
1162                                 ret=cdo->tray_move(cdi,0);
1163                                 if (ret) {
1164                                         cdinfo(CD_OPEN, "bummer. tried to close tray but failed.\n"); 
1165                                         /* Ignore the error from the low
1166                                         level driver.  We don't care why it
1167                                         couldn't close the tray.  We only care 
1168                                         that there is no disc in the drive, 
1169                                         since that is the _REAL_ problem here.*/
1170                                         return -ENOMEDIUM;
1171                                 }
1172                         } else {
1173                                 cdinfo(CD_OPEN, "bummer. this driver can't close the tray.\n"); 
1174                                 return -ENOMEDIUM;
1175                         }
1176                         /* Ok, the door should be closed now.. Check again */
1177                         ret = cdo->drive_status(cdi, CDSL_CURRENT);
1178                         if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
1179                                 cdinfo(CD_OPEN, "bummer. the tray is still not closed.\n"); 
1180                                 return -ENOMEDIUM;
1181                         }       
1182                         if (ret!=CDS_DISC_OK) {
1183                                 cdinfo(CD_OPEN, "bummer. disc isn't ready.\n"); 
1184                                 return -EIO;
1185                         }       
1186                         cdinfo(CD_OPEN, "the tray is now closed.\n"); 
1187                 }       
1188         }
1189         cdrom_count_tracks(cdi, &tracks);
1190         if (tracks.error) 
1191                 return(tracks.error);
1192
1193         if (tracks.audio==0)
1194                 return -EMEDIUMTYPE;
1195
1196         return 0;
1197 }
1198
1199 /* Admittedly, the logic below could be performed in a nicer way. */
1200 int cdrom_release(struct cdrom_device_info *cdi, struct file *fp)
1201 {
1202         struct cdrom_device_ops *cdo = cdi->ops;
1203         int opened_for_data;
1204
1205         cdinfo(CD_CLOSE, "entering cdrom_release\n"); 
1206
1207         if (cdi->use_count > 0)
1208                 cdi->use_count--;
1209         if (cdi->use_count == 0)
1210                 cdinfo(CD_CLOSE, "Use count for \"/dev/%s\" now zero\n", cdi->name);
1211         if (cdi->use_count == 0)
1212                 cdrom_dvd_rw_close_write(cdi);
1213         if (cdi->use_count == 0 &&
1214             (cdo->capability & CDC_LOCK) && !keeplocked) {
1215                 cdinfo(CD_CLOSE, "Unlocking door!\n");
1216                 cdo->lock_door(cdi, 0);
1217         }
1218         opened_for_data = !(cdi->options & CDO_USE_FFLAGS) ||
1219                 !(fp && fp->f_flags & O_NONBLOCK);
1220
1221         /*
1222          * flush cache on last write release
1223          */
1224         if (CDROM_CAN(CDC_RAM) && !cdi->use_count && cdi->for_data)
1225                 cdrom_close_write(cdi);
1226
1227         cdo->release(cdi);
1228         if (cdi->use_count == 0) {      /* last process that closes dev*/
1229                 if (opened_for_data &&
1230                     cdi->options & CDO_AUTO_EJECT && CDROM_CAN(CDC_OPEN_TRAY))
1231                         cdo->tray_move(cdi, 1);
1232         }
1233         return 0;
1234 }
1235
1236 static int cdrom_read_mech_status(struct cdrom_device_info *cdi, 
1237                                   struct cdrom_changer_info *buf)
1238 {
1239         struct packet_command cgc;
1240         struct cdrom_device_ops *cdo = cdi->ops;
1241         int length;
1242
1243         /*
1244          * Sanyo changer isn't spec compliant (doesn't use regular change
1245          * LOAD_UNLOAD command, and it doesn't implement the mech status
1246          * command below
1247          */
1248         if (cdi->sanyo_slot) {
1249                 buf->hdr.nslots = 3;
1250                 buf->hdr.curslot = cdi->sanyo_slot == 3 ? 0 : cdi->sanyo_slot;
1251                 for (length = 0; length < 3; length++) {
1252                         buf->slots[length].disc_present = 1;
1253                         buf->slots[length].change = 0;
1254                 }
1255                 return 0;
1256         }
1257
1258         length = sizeof(struct cdrom_mechstat_header) +
1259                  cdi->capacity * sizeof(struct cdrom_slot);
1260
1261         init_cdrom_command(&cgc, buf, length, CGC_DATA_READ);
1262         cgc.cmd[0] = GPCMD_MECHANISM_STATUS;
1263         cgc.cmd[8] = (length >> 8) & 0xff;
1264         cgc.cmd[9] = length & 0xff;
1265         return cdo->generic_packet(cdi, &cgc);
1266 }
1267
1268 static int cdrom_slot_status(struct cdrom_device_info *cdi, int slot)
1269 {
1270         struct cdrom_changer_info *info;
1271         int ret;
1272
1273         cdinfo(CD_CHANGER, "entering cdrom_slot_status()\n"); 
1274         if (cdi->sanyo_slot)
1275                 return CDS_NO_INFO;
1276         
1277         info = kmalloc(sizeof(*info), GFP_KERNEL);
1278         if (!info)
1279                 return -ENOMEM;
1280
1281         if ((ret = cdrom_read_mech_status(cdi, info)))
1282                 goto out_free;
1283
1284         if (info->slots[slot].disc_present)
1285                 ret = CDS_DISC_OK;
1286         else
1287                 ret = CDS_NO_DISC;
1288
1289 out_free:
1290         kfree(info);
1291         return ret;
1292 }
1293
1294 /* Return the number of slots for an ATAPI/SCSI cdrom, 
1295  * return 1 if not a changer. 
1296  */
1297 int cdrom_number_of_slots(struct cdrom_device_info *cdi) 
1298 {
1299         int status;
1300         int nslots = 1;
1301         struct cdrom_changer_info *info;
1302
1303         cdinfo(CD_CHANGER, "entering cdrom_number_of_slots()\n"); 
1304         /* cdrom_read_mech_status requires a valid value for capacity: */
1305         cdi->capacity = 0; 
1306
1307         info = kmalloc(sizeof(*info), GFP_KERNEL);
1308         if (!info)
1309                 return -ENOMEM;
1310
1311         if ((status = cdrom_read_mech_status(cdi, info)) == 0)
1312                 nslots = info->hdr.nslots;
1313
1314         kfree(info);
1315         return nslots;
1316 }
1317
1318
1319 /* If SLOT < 0, unload the current slot.  Otherwise, try to load SLOT. */
1320 static int cdrom_load_unload(struct cdrom_device_info *cdi, int slot) 
1321 {
1322         struct packet_command cgc;
1323
1324         cdinfo(CD_CHANGER, "entering cdrom_load_unload()\n"); 
1325         if (cdi->sanyo_slot && slot < 0)
1326                 return 0;
1327
1328         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1329         cgc.cmd[0] = GPCMD_LOAD_UNLOAD;
1330         cgc.cmd[4] = 2 + (slot >= 0);
1331         cgc.cmd[8] = slot;
1332         cgc.timeout = 60 * HZ;
1333
1334         /* The Sanyo 3 CD changer uses byte 7 of the 
1335         GPCMD_TEST_UNIT_READY to command to switch CDs instead of
1336         using the GPCMD_LOAD_UNLOAD opcode. */
1337         if (cdi->sanyo_slot && -1 < slot) {
1338                 cgc.cmd[0] = GPCMD_TEST_UNIT_READY;
1339                 cgc.cmd[7] = slot;
1340                 cgc.cmd[4] = cgc.cmd[8] = 0;
1341                 cdi->sanyo_slot = slot ? slot : 3;
1342         }
1343
1344         return cdi->ops->generic_packet(cdi, &cgc);
1345 }
1346
1347 static int cdrom_select_disc(struct cdrom_device_info *cdi, int slot)
1348 {
1349         struct cdrom_changer_info *info;
1350         int curslot;
1351         int ret;
1352
1353         cdinfo(CD_CHANGER, "entering cdrom_select_disc()\n"); 
1354         if (!CDROM_CAN(CDC_SELECT_DISC))
1355                 return -EDRIVE_CANT_DO_THIS;
1356
1357         (void) cdi->ops->media_changed(cdi, slot);
1358
1359         if (slot == CDSL_NONE) {
1360                 /* set media changed bits, on both queues */
1361                 cdi->mc_flags = 0x3;
1362                 return cdrom_load_unload(cdi, -1);
1363         }
1364
1365         info = kmalloc(sizeof(*info), GFP_KERNEL);
1366         if (!info)
1367                 return -ENOMEM;
1368
1369         if ((ret = cdrom_read_mech_status(cdi, info))) {
1370                 kfree(info);
1371                 return ret;
1372         }
1373
1374         curslot = info->hdr.curslot;
1375         kfree(info);
1376
1377         if (cdi->use_count > 1 || keeplocked) {
1378                 if (slot == CDSL_CURRENT) {
1379                         return curslot;
1380                 } else {
1381                         return -EBUSY;
1382                 }
1383         }
1384
1385         /* Specifying CDSL_CURRENT will attempt to load the currnet slot,
1386         which is useful if it had been previously unloaded.
1387         Whether it can or not, it returns the current slot. 
1388         Similarly,  if slot happens to be the current one, we still
1389         try and load it. */
1390         if (slot == CDSL_CURRENT)
1391                 slot = curslot;
1392
1393         /* set media changed bits on both queues */
1394         cdi->mc_flags = 0x3;
1395         if ((ret = cdrom_load_unload(cdi, slot)))
1396                 return ret;
1397
1398         return slot;
1399 }
1400
1401 /* We want to make media_changed accessible to the user through an
1402  * ioctl. The main problem now is that we must double-buffer the
1403  * low-level implementation, to assure that the VFS and the user both
1404  * see a medium change once.
1405  */
1406
1407 static
1408 int media_changed(struct cdrom_device_info *cdi, int queue)
1409 {
1410         unsigned int mask = (1 << (queue & 1));
1411         int ret = !!(cdi->mc_flags & mask);
1412
1413         if (!CDROM_CAN(CDC_MEDIA_CHANGED))
1414             return ret;
1415         /* changed since last call? */
1416         if (cdi->ops->media_changed(cdi, CDSL_CURRENT)) {
1417                 cdi->mc_flags = 0x3;    /* set bit on both queues */
1418                 ret |= 1;
1419                 cdi->media_written = 0;
1420         }
1421         cdi->mc_flags &= ~mask;         /* clear bit */
1422         return ret;
1423 }
1424
1425 int cdrom_media_changed(struct cdrom_device_info *cdi)
1426 {
1427         /* This talks to the VFS, which doesn't like errors - just 1 or 0.  
1428          * Returning "0" is always safe (media hasn't been changed). Do that 
1429          * if the low-level cdrom driver dosn't support media changed. */ 
1430         if (cdi == NULL || cdi->ops->media_changed == NULL)
1431                 return 0;
1432         if (!CDROM_CAN(CDC_MEDIA_CHANGED))
1433                 return 0;
1434         return media_changed(cdi, 0);
1435 }
1436
1437 /* badly broken, I know. Is due for a fixup anytime. */
1438 static void cdrom_count_tracks(struct cdrom_device_info *cdi, tracktype* tracks)
1439 {
1440         struct cdrom_tochdr header;
1441         struct cdrom_tocentry entry;
1442         int ret, i;
1443         tracks->data=0;
1444         tracks->audio=0;
1445         tracks->cdi=0;
1446         tracks->xa=0;
1447         tracks->error=0;
1448         cdinfo(CD_COUNT_TRACKS, "entering cdrom_count_tracks\n"); 
1449         if (!CDROM_CAN(CDC_PLAY_AUDIO)) { 
1450                 tracks->error=CDS_NO_INFO;
1451                 return;
1452         }        
1453         /* Grab the TOC header so we can see how many tracks there are */
1454         if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header))) {
1455                 if (ret == -ENOMEDIUM)
1456                         tracks->error = CDS_NO_DISC;
1457                 else
1458                         tracks->error = CDS_NO_INFO;
1459                 return;
1460         }       
1461         /* check what type of tracks are on this disc */
1462         entry.cdte_format = CDROM_MSF;
1463         for (i = header.cdth_trk0; i <= header.cdth_trk1; i++) {
1464                 entry.cdte_track  = i;
1465                 if (cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry)) {
1466                         tracks->error=CDS_NO_INFO;
1467                         return;
1468                 }       
1469                 if (entry.cdte_ctrl & CDROM_DATA_TRACK) {
1470                     if (entry.cdte_format == 0x10)
1471                         tracks->cdi++;
1472                     else if (entry.cdte_format == 0x20) 
1473                         tracks->xa++;
1474                     else
1475                         tracks->data++;
1476                 } else
1477                     tracks->audio++;
1478                 cdinfo(CD_COUNT_TRACKS, "track %d: format=%d, ctrl=%d\n",
1479                        i, entry.cdte_format, entry.cdte_ctrl);
1480         }       
1481         cdinfo(CD_COUNT_TRACKS, "disc has %d tracks: %d=audio %d=data %d=Cd-I %d=XA\n", 
1482                 header.cdth_trk1, tracks->audio, tracks->data, 
1483                 tracks->cdi, tracks->xa);
1484 }       
1485
1486 /* Requests to the low-level drivers will /always/ be done in the
1487    following format convention:
1488
1489    CDROM_LBA: all data-related requests.
1490    CDROM_MSF: all audio-related requests.
1491
1492    However, a low-level implementation is allowed to refuse this
1493    request, and return information in its own favorite format.
1494
1495    It doesn't make sense /at all/ to ask for a play_audio in LBA
1496    format, or ask for multi-session info in MSF format. However, for
1497    backward compatibility these format requests will be satisfied, but
1498    the requests to the low-level drivers will be sanitized in the more
1499    meaningful format indicated above.
1500  */
1501
1502 static
1503 void sanitize_format(union cdrom_addr *addr,
1504                      u_char * curr, u_char requested)
1505 {
1506         if (*curr == requested)
1507                 return;                 /* nothing to be done! */
1508         if (requested == CDROM_LBA) {
1509                 addr->lba = (int) addr->msf.frame +
1510                         75 * (addr->msf.second - 2 + 60 * addr->msf.minute);
1511         } else {                        /* CDROM_MSF */
1512                 int lba = addr->lba;
1513                 addr->msf.frame = lba % 75;
1514                 lba /= 75;
1515                 lba += 2;
1516                 addr->msf.second = lba % 60;
1517                 addr->msf.minute = lba / 60;
1518         }
1519         *curr = requested;
1520 }
1521
1522 void init_cdrom_command(struct packet_command *cgc, void *buf, int len,
1523                         int type)
1524 {
1525         memset(cgc, 0, sizeof(struct packet_command));
1526         if (buf)
1527                 memset(buf, 0, len);
1528         cgc->buffer = (char *) buf;
1529         cgc->buflen = len;
1530         cgc->data_direction = type;
1531         cgc->timeout = 5*HZ;
1532 }
1533
1534 /* DVD handling */
1535
1536 #define copy_key(dest,src)      memcpy((dest), (src), sizeof(dvd_key))
1537 #define copy_chal(dest,src)     memcpy((dest), (src), sizeof(dvd_challenge))
1538
1539 static void setup_report_key(struct packet_command *cgc, unsigned agid, unsigned type)
1540 {
1541         cgc->cmd[0] = GPCMD_REPORT_KEY;
1542         cgc->cmd[10] = type | (agid << 6);
1543         switch (type) {
1544                 case 0: case 8: case 5: {
1545                         cgc->buflen = 8;
1546                         break;
1547                 }
1548                 case 1: {
1549                         cgc->buflen = 16;
1550                         break;
1551                 }
1552                 case 2: case 4: {
1553                         cgc->buflen = 12;
1554                         break;
1555                 }
1556         }
1557         cgc->cmd[9] = cgc->buflen;
1558         cgc->data_direction = CGC_DATA_READ;
1559 }
1560
1561 static void setup_send_key(struct packet_command *cgc, unsigned agid, unsigned type)
1562 {
1563         cgc->cmd[0] = GPCMD_SEND_KEY;
1564         cgc->cmd[10] = type | (agid << 6);
1565         switch (type) {
1566                 case 1: {
1567                         cgc->buflen = 16;
1568                         break;
1569                 }
1570                 case 3: {
1571                         cgc->buflen = 12;
1572                         break;
1573                 }
1574                 case 6: {
1575                         cgc->buflen = 8;
1576                         break;
1577                 }
1578         }
1579         cgc->cmd[9] = cgc->buflen;
1580         cgc->data_direction = CGC_DATA_WRITE;
1581 }
1582
1583 static int dvd_do_auth(struct cdrom_device_info *cdi, dvd_authinfo *ai)
1584 {
1585         int ret;
1586         u_char buf[20];
1587         struct packet_command cgc;
1588         struct cdrom_device_ops *cdo = cdi->ops;
1589         rpc_state_t rpc_state;
1590
1591         memset(buf, 0, sizeof(buf));
1592         init_cdrom_command(&cgc, buf, 0, CGC_DATA_READ);
1593
1594         switch (ai->type) {
1595         /* LU data send */
1596         case DVD_LU_SEND_AGID:
1597                 cdinfo(CD_DVD, "entering DVD_LU_SEND_AGID\n"); 
1598                 cgc.quiet = 1;
1599                 setup_report_key(&cgc, ai->lsa.agid, 0);
1600
1601                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1602                         return ret;
1603
1604                 ai->lsa.agid = buf[7] >> 6;
1605                 /* Returning data, let host change state */
1606                 break;
1607
1608         case DVD_LU_SEND_KEY1:
1609                 cdinfo(CD_DVD, "entering DVD_LU_SEND_KEY1\n"); 
1610                 setup_report_key(&cgc, ai->lsk.agid, 2);
1611
1612                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1613                         return ret;
1614
1615                 copy_key(ai->lsk.key, &buf[4]);
1616                 /* Returning data, let host change state */
1617                 break;
1618
1619         case DVD_LU_SEND_CHALLENGE:
1620                 cdinfo(CD_DVD, "entering DVD_LU_SEND_CHALLENGE\n"); 
1621                 setup_report_key(&cgc, ai->lsc.agid, 1);
1622
1623                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1624                         return ret;
1625
1626                 copy_chal(ai->lsc.chal, &buf[4]);
1627                 /* Returning data, let host change state */
1628                 break;
1629
1630         /* Post-auth key */
1631         case DVD_LU_SEND_TITLE_KEY:
1632                 cdinfo(CD_DVD, "entering DVD_LU_SEND_TITLE_KEY\n"); 
1633                 cgc.quiet = 1;
1634                 setup_report_key(&cgc, ai->lstk.agid, 4);
1635                 cgc.cmd[5] = ai->lstk.lba;
1636                 cgc.cmd[4] = ai->lstk.lba >> 8;
1637                 cgc.cmd[3] = ai->lstk.lba >> 16;
1638                 cgc.cmd[2] = ai->lstk.lba >> 24;
1639
1640                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1641                         return ret;
1642
1643                 ai->lstk.cpm = (buf[4] >> 7) & 1;
1644                 ai->lstk.cp_sec = (buf[4] >> 6) & 1;
1645                 ai->lstk.cgms = (buf[4] >> 4) & 3;
1646                 copy_key(ai->lstk.title_key, &buf[5]);
1647                 /* Returning data, let host change state */
1648                 break;
1649
1650         case DVD_LU_SEND_ASF:
1651                 cdinfo(CD_DVD, "entering DVD_LU_SEND_ASF\n"); 
1652                 setup_report_key(&cgc, ai->lsasf.agid, 5);
1653                 
1654                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1655                         return ret;
1656
1657                 ai->lsasf.asf = buf[7] & 1;
1658                 break;
1659
1660         /* LU data receive (LU changes state) */
1661         case DVD_HOST_SEND_CHALLENGE:
1662                 cdinfo(CD_DVD, "entering DVD_HOST_SEND_CHALLENGE\n"); 
1663                 setup_send_key(&cgc, ai->hsc.agid, 1);
1664                 buf[1] = 0xe;
1665                 copy_chal(&buf[4], ai->hsc.chal);
1666
1667                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1668                         return ret;
1669
1670                 ai->type = DVD_LU_SEND_KEY1;
1671                 break;
1672
1673         case DVD_HOST_SEND_KEY2:
1674                 cdinfo(CD_DVD, "entering DVD_HOST_SEND_KEY2\n"); 
1675                 setup_send_key(&cgc, ai->hsk.agid, 3);
1676                 buf[1] = 0xa;
1677                 copy_key(&buf[4], ai->hsk.key);
1678
1679                 if ((ret = cdo->generic_packet(cdi, &cgc))) {
1680                         ai->type = DVD_AUTH_FAILURE;
1681                         return ret;
1682                 }
1683                 ai->type = DVD_AUTH_ESTABLISHED;
1684                 break;
1685
1686         /* Misc */
1687         case DVD_INVALIDATE_AGID:
1688                 cgc.quiet = 1;
1689                 cdinfo(CD_DVD, "entering DVD_INVALIDATE_AGID\n"); 
1690                 setup_report_key(&cgc, ai->lsa.agid, 0x3f);
1691                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1692                         return ret;
1693                 break;
1694
1695         /* Get region settings */
1696         case DVD_LU_SEND_RPC_STATE:
1697                 cdinfo(CD_DVD, "entering DVD_LU_SEND_RPC_STATE\n");
1698                 setup_report_key(&cgc, 0, 8);
1699                 memset(&rpc_state, 0, sizeof(rpc_state_t));
1700                 cgc.buffer = (char *) &rpc_state;
1701
1702                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1703                         return ret;
1704
1705                 ai->lrpcs.type = rpc_state.type_code;
1706                 ai->lrpcs.vra = rpc_state.vra;
1707                 ai->lrpcs.ucca = rpc_state.ucca;
1708                 ai->lrpcs.region_mask = rpc_state.region_mask;
1709                 ai->lrpcs.rpc_scheme = rpc_state.rpc_scheme;
1710                 break;
1711
1712         /* Set region settings */
1713         case DVD_HOST_SEND_RPC_STATE:
1714                 cdinfo(CD_DVD, "entering DVD_HOST_SEND_RPC_STATE\n");
1715                 setup_send_key(&cgc, 0, 6);
1716                 buf[1] = 6;
1717                 buf[4] = ai->hrpcs.pdrc;
1718
1719                 if ((ret = cdo->generic_packet(cdi, &cgc)))
1720                         return ret;
1721                 break;
1722
1723         default:
1724                 cdinfo(CD_WARNING, "Invalid DVD key ioctl (%d)\n", ai->type);
1725                 return -ENOTTY;
1726         }
1727
1728         return 0;
1729 }
1730
1731 static int dvd_read_physical(struct cdrom_device_info *cdi, dvd_struct *s)
1732 {
1733         unsigned char buf[21], *base;
1734         struct dvd_layer *layer;
1735         struct packet_command cgc;
1736         struct cdrom_device_ops *cdo = cdi->ops;
1737         int ret, layer_num = s->physical.layer_num;
1738
1739         if (layer_num >= DVD_LAYERS)
1740                 return -EINVAL;
1741
1742         init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1743         cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1744         cgc.cmd[6] = layer_num;
1745         cgc.cmd[7] = s->type;
1746         cgc.cmd[9] = cgc.buflen & 0xff;
1747
1748         /*
1749          * refrain from reporting errors on non-existing layers (mainly)
1750          */
1751         cgc.quiet = 1;
1752
1753         if ((ret = cdo->generic_packet(cdi, &cgc)))
1754                 return ret;
1755
1756         base = &buf[4];
1757         layer = &s->physical.layer[layer_num];
1758
1759         /*
1760          * place the data... really ugly, but at least we won't have to
1761          * worry about endianess in userspace.
1762          */
1763         memset(layer, 0, sizeof(*layer));
1764         layer->book_version = base[0] & 0xf;
1765         layer->book_type = base[0] >> 4;
1766         layer->min_rate = base[1] & 0xf;
1767         layer->disc_size = base[1] >> 4;
1768         layer->layer_type = base[2] & 0xf;
1769         layer->track_path = (base[2] >> 4) & 1;
1770         layer->nlayers = (base[2] >> 5) & 3;
1771         layer->track_density = base[3] & 0xf;
1772         layer->linear_density = base[3] >> 4;
1773         layer->start_sector = base[5] << 16 | base[6] << 8 | base[7];
1774         layer->end_sector = base[9] << 16 | base[10] << 8 | base[11];
1775         layer->end_sector_l0 = base[13] << 16 | base[14] << 8 | base[15];
1776         layer->bca = base[16] >> 7;
1777
1778         return 0;
1779 }
1780
1781 static int dvd_read_copyright(struct cdrom_device_info *cdi, dvd_struct *s)
1782 {
1783         int ret;
1784         u_char buf[8];
1785         struct packet_command cgc;
1786         struct cdrom_device_ops *cdo = cdi->ops;
1787
1788         init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1789         cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1790         cgc.cmd[6] = s->copyright.layer_num;
1791         cgc.cmd[7] = s->type;
1792         cgc.cmd[8] = cgc.buflen >> 8;
1793         cgc.cmd[9] = cgc.buflen & 0xff;
1794
1795         if ((ret = cdo->generic_packet(cdi, &cgc)))
1796                 return ret;
1797
1798         s->copyright.cpst = buf[4];
1799         s->copyright.rmi = buf[5];
1800
1801         return 0;
1802 }
1803
1804 static int dvd_read_disckey(struct cdrom_device_info *cdi, dvd_struct *s)
1805 {
1806         int ret, size;
1807         u_char *buf;
1808         struct packet_command cgc;
1809         struct cdrom_device_ops *cdo = cdi->ops;
1810
1811         size = sizeof(s->disckey.value) + 4;
1812
1813         if ((buf = (u_char *) kmalloc(size, GFP_KERNEL)) == NULL)
1814                 return -ENOMEM;
1815
1816         init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1817         cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1818         cgc.cmd[7] = s->type;
1819         cgc.cmd[8] = size >> 8;
1820         cgc.cmd[9] = size & 0xff;
1821         cgc.cmd[10] = s->disckey.agid << 6;
1822
1823         if (!(ret = cdo->generic_packet(cdi, &cgc)))
1824                 memcpy(s->disckey.value, &buf[4], sizeof(s->disckey.value));
1825
1826         kfree(buf);
1827         return ret;
1828 }
1829
1830 static int dvd_read_bca(struct cdrom_device_info *cdi, dvd_struct *s)
1831 {
1832         int ret;
1833         u_char buf[4 + 188];
1834         struct packet_command cgc;
1835         struct cdrom_device_ops *cdo = cdi->ops;
1836
1837         init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1838         cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1839         cgc.cmd[7] = s->type;
1840         cgc.cmd[9] = cgc.buflen = 0xff;
1841
1842         if ((ret = cdo->generic_packet(cdi, &cgc)))
1843                 return ret;
1844
1845         s->bca.len = buf[0] << 8 | buf[1];
1846         if (s->bca.len < 12 || s->bca.len > 188) {
1847                 cdinfo(CD_WARNING, "Received invalid BCA length (%d)\n", s->bca.len);
1848                 return -EIO;
1849         }
1850         memcpy(s->bca.value, &buf[4], s->bca.len);
1851
1852         return 0;
1853 }
1854
1855 static int dvd_read_manufact(struct cdrom_device_info *cdi, dvd_struct *s)
1856 {
1857         int ret = 0, size;
1858         u_char *buf;
1859         struct packet_command cgc;
1860         struct cdrom_device_ops *cdo = cdi->ops;
1861
1862         size = sizeof(s->manufact.value) + 4;
1863
1864         if ((buf = (u_char *) kmalloc(size, GFP_KERNEL)) == NULL)
1865                 return -ENOMEM;
1866
1867         init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1868         cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1869         cgc.cmd[7] = s->type;
1870         cgc.cmd[8] = size >> 8;
1871         cgc.cmd[9] = size & 0xff;
1872
1873         if ((ret = cdo->generic_packet(cdi, &cgc))) {
1874                 kfree(buf);
1875                 return ret;
1876         }
1877
1878         s->manufact.len = buf[0] << 8 | buf[1];
1879         if (s->manufact.len < 0 || s->manufact.len > 2048) {
1880                 cdinfo(CD_WARNING, "Received invalid manufacture info length"
1881                                    " (%d)\n", s->manufact.len);
1882                 ret = -EIO;
1883         } else {
1884                 memcpy(s->manufact.value, &buf[4], s->manufact.len);
1885         }
1886
1887         kfree(buf);
1888         return ret;
1889 }
1890
1891 static int dvd_read_struct(struct cdrom_device_info *cdi, dvd_struct *s)
1892 {
1893         switch (s->type) {
1894         case DVD_STRUCT_PHYSICAL:
1895                 return dvd_read_physical(cdi, s);
1896
1897         case DVD_STRUCT_COPYRIGHT:
1898                 return dvd_read_copyright(cdi, s);
1899
1900         case DVD_STRUCT_DISCKEY:
1901                 return dvd_read_disckey(cdi, s);
1902
1903         case DVD_STRUCT_BCA:
1904                 return dvd_read_bca(cdi, s);
1905
1906         case DVD_STRUCT_MANUFACT:
1907                 return dvd_read_manufact(cdi, s);
1908                 
1909         default:
1910                 cdinfo(CD_WARNING, ": Invalid DVD structure read requested (%d)\n",
1911                                         s->type);
1912                 return -EINVAL;
1913         }
1914 }
1915
1916 int cdrom_mode_sense(struct cdrom_device_info *cdi,
1917                      struct packet_command *cgc,
1918                      int page_code, int page_control)
1919 {
1920         struct cdrom_device_ops *cdo = cdi->ops;
1921
1922         memset(cgc->cmd, 0, sizeof(cgc->cmd));
1923
1924         cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1925         cgc->cmd[2] = page_code | (page_control << 6);
1926         cgc->cmd[7] = cgc->buflen >> 8;
1927         cgc->cmd[8] = cgc->buflen & 0xff;
1928         cgc->data_direction = CGC_DATA_READ;
1929         return cdo->generic_packet(cdi, cgc);
1930 }
1931
1932 int cdrom_mode_select(struct cdrom_device_info *cdi,
1933                       struct packet_command *cgc)
1934 {
1935         struct cdrom_device_ops *cdo = cdi->ops;
1936
1937         memset(cgc->cmd, 0, sizeof(cgc->cmd));
1938         memset(cgc->buffer, 0, 2);
1939         cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1940         cgc->cmd[1] = 0x10;             /* PF */
1941         cgc->cmd[7] = cgc->buflen >> 8;
1942         cgc->cmd[8] = cgc->buflen & 0xff;
1943         cgc->data_direction = CGC_DATA_WRITE;
1944         return cdo->generic_packet(cdi, cgc);
1945 }
1946
1947 static int cdrom_read_subchannel(struct cdrom_device_info *cdi,
1948                                  struct cdrom_subchnl *subchnl, int mcn)
1949 {
1950         struct cdrom_device_ops *cdo = cdi->ops;
1951         struct packet_command cgc;
1952         char buffer[32];
1953         int ret;
1954
1955         init_cdrom_command(&cgc, buffer, 16, CGC_DATA_READ);
1956         cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
1957         cgc.cmd[1] = 2;     /* MSF addressing */
1958         cgc.cmd[2] = 0x40;  /* request subQ data */
1959         cgc.cmd[3] = mcn ? 2 : 1;
1960         cgc.cmd[8] = 16;
1961
1962         if ((ret = cdo->generic_packet(cdi, &cgc)))
1963                 return ret;
1964
1965         subchnl->cdsc_audiostatus = cgc.buffer[1];
1966         subchnl->cdsc_format = CDROM_MSF;
1967         subchnl->cdsc_ctrl = cgc.buffer[5] & 0xf;
1968         subchnl->cdsc_trk = cgc.buffer[6];
1969         subchnl->cdsc_ind = cgc.buffer[7];
1970
1971         subchnl->cdsc_reladdr.msf.minute = cgc.buffer[13];
1972         subchnl->cdsc_reladdr.msf.second = cgc.buffer[14];
1973         subchnl->cdsc_reladdr.msf.frame = cgc.buffer[15];
1974         subchnl->cdsc_absaddr.msf.minute = cgc.buffer[9];
1975         subchnl->cdsc_absaddr.msf.second = cgc.buffer[10];
1976         subchnl->cdsc_absaddr.msf.frame = cgc.buffer[11];
1977
1978         return 0;
1979 }
1980
1981 /*
1982  * Specific READ_10 interface
1983  */
1984 static int cdrom_read_cd(struct cdrom_device_info *cdi,
1985                          struct packet_command *cgc, int lba,
1986                          int blocksize, int nblocks)
1987 {
1988         struct cdrom_device_ops *cdo = cdi->ops;
1989
1990         memset(&cgc->cmd, 0, sizeof(cgc->cmd));
1991         cgc->cmd[0] = GPCMD_READ_10;
1992         cgc->cmd[2] = (lba >> 24) & 0xff;
1993         cgc->cmd[3] = (lba >> 16) & 0xff;
1994         cgc->cmd[4] = (lba >>  8) & 0xff;
1995         cgc->cmd[5] = lba & 0xff;
1996         cgc->cmd[6] = (nblocks >> 16) & 0xff;
1997         cgc->cmd[7] = (nblocks >>  8) & 0xff;
1998         cgc->cmd[8] = nblocks & 0xff;
1999         cgc->buflen = blocksize * nblocks;
2000         return cdo->generic_packet(cdi, cgc);
2001 }
2002
2003 /* very generic interface for reading the various types of blocks */
2004 static int cdrom_read_block(struct cdrom_device_info *cdi,
2005                             struct packet_command *cgc,
2006                             int lba, int nblocks, int format, int blksize)
2007 {
2008         struct cdrom_device_ops *cdo = cdi->ops;
2009
2010         memset(&cgc->cmd, 0, sizeof(cgc->cmd));
2011         cgc->cmd[0] = GPCMD_READ_CD;
2012         /* expected sector size - cdda,mode1,etc. */
2013         cgc->cmd[1] = format << 2;
2014         /* starting address */
2015         cgc->cmd[2] = (lba >> 24) & 0xff;
2016         cgc->cmd[3] = (lba >> 16) & 0xff;
2017         cgc->cmd[4] = (lba >>  8) & 0xff;
2018         cgc->cmd[5] = lba & 0xff;
2019         /* number of blocks */
2020         cgc->cmd[6] = (nblocks >> 16) & 0xff;
2021         cgc->cmd[7] = (nblocks >>  8) & 0xff;
2022         cgc->cmd[8] = nblocks & 0xff;
2023         cgc->buflen = blksize * nblocks;
2024         
2025         /* set the header info returned */
2026         switch (blksize) {
2027         case CD_FRAMESIZE_RAW0  : cgc->cmd[9] = 0x58; break;
2028         case CD_FRAMESIZE_RAW1  : cgc->cmd[9] = 0x78; break;
2029         case CD_FRAMESIZE_RAW   : cgc->cmd[9] = 0xf8; break;
2030         default                 : cgc->cmd[9] = 0x10;
2031         }
2032         
2033         return cdo->generic_packet(cdi, cgc);
2034 }
2035
2036 static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2037                                int lba, int nframes)
2038 {
2039         struct packet_command cgc;
2040         int ret = 0;
2041         int nr;
2042
2043         cdi->last_sense = 0;
2044
2045         memset(&cgc, 0, sizeof(cgc));
2046
2047         /*
2048          * start with will ra.nframes size, back down if alloc fails
2049          */
2050         nr = nframes;
2051         do {
2052                 cgc.buffer = kmalloc(CD_FRAMESIZE_RAW * nr, GFP_KERNEL);
2053                 if (cgc.buffer)
2054                         break;
2055
2056                 nr >>= 1;
2057         } while (nr);
2058
2059         if (!nr)
2060                 return -ENOMEM;
2061
2062         if (!access_ok(VERIFY_WRITE, ubuf, nframes * CD_FRAMESIZE_RAW)) {
2063                 ret = -EFAULT;
2064                 goto out;
2065         }
2066
2067         cgc.data_direction = CGC_DATA_READ;
2068         while (nframes > 0) {
2069                 if (nr > nframes)
2070                         nr = nframes;
2071
2072                 ret = cdrom_read_block(cdi, &cgc, lba, nr, 1, CD_FRAMESIZE_RAW);
2073                 if (ret)
2074                         break;
2075                 if (__copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) {
2076                         ret = -EFAULT;
2077                         break;
2078                 }
2079                 ubuf += CD_FRAMESIZE_RAW * nr;
2080                 nframes -= nr;
2081                 lba += nr;
2082         }
2083 out:
2084         kfree(cgc.buffer);
2085         return ret;
2086 }
2087
2088 static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2089                                int lba, int nframes)
2090 {
2091         request_queue_t *q = cdi->disk->queue;
2092         struct request *rq;
2093         struct bio *bio;
2094         unsigned int len;
2095         int nr, ret = 0;
2096
2097         if (!q)
2098                 return -ENXIO;
2099
2100         rq = blk_get_request(q, READ, GFP_KERNEL);
2101         if (!rq)
2102                 return -ENOMEM;
2103
2104         cdi->last_sense = 0;
2105
2106         while (nframes) {
2107                 nr = nframes;
2108                 if (cdi->cdda_method == CDDA_BPC_SINGLE)
2109                         nr = 1;
2110                 if (nr * CD_FRAMESIZE_RAW > (q->max_sectors << 9))
2111                         nr = (q->max_sectors << 9) / CD_FRAMESIZE_RAW;
2112
2113                 len = nr * CD_FRAMESIZE_RAW;
2114
2115                 ret = blk_rq_map_user(q, rq, ubuf, len);
2116                 if (ret)
2117                         break;
2118
2119                 memset(rq->cmd, 0, sizeof(rq->cmd));
2120                 rq->cmd[0] = GPCMD_READ_CD;
2121                 rq->cmd[1] = 1 << 2;
2122                 rq->cmd[2] = (lba >> 24) & 0xff;
2123                 rq->cmd[3] = (lba >> 16) & 0xff;
2124                 rq->cmd[4] = (lba >>  8) & 0xff;
2125                 rq->cmd[5] = lba & 0xff;
2126                 rq->cmd[6] = (nr >> 16) & 0xff;
2127                 rq->cmd[7] = (nr >>  8) & 0xff;
2128                 rq->cmd[8] = nr & 0xff;
2129                 rq->cmd[9] = 0xf8;
2130
2131                 rq->cmd_len = 12;
2132                 rq->flags |= REQ_BLOCK_PC;
2133                 rq->timeout = 60 * HZ;
2134                 bio = rq->bio;
2135
2136                 if (rq->bio)
2137                         blk_queue_bounce(q, &rq->bio);
2138
2139                 if (blk_execute_rq(q, cdi->disk, rq, 0)) {
2140                         struct request_sense *s = rq->sense;
2141                         ret = -EIO;
2142                         cdi->last_sense = s->sense_key;
2143                 }
2144
2145                 if (blk_rq_unmap_user(bio, len))
2146                         ret = -EFAULT;
2147
2148                 if (ret)
2149                         break;
2150
2151                 nframes -= nr;
2152                 lba += nr;
2153                 ubuf += len;
2154         }
2155
2156         blk_put_request(rq);
2157         return ret;
2158 }
2159
2160 static int cdrom_read_cdda(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2161                            int lba, int nframes)
2162 {
2163         int ret;
2164
2165         if (cdi->cdda_method == CDDA_OLD)
2166                 return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
2167
2168 retry:
2169         /*
2170          * for anything else than success and io error, we need to retry
2171          */
2172         ret = cdrom_read_cdda_bpc(cdi, ubuf, lba, nframes);
2173         if (!ret || ret != -EIO)
2174                 return ret;
2175
2176         /*
2177          * I've seen drives get sense 4/8/3 udma crc errors on multi
2178          * frame dma, so drop to single frame dma if we need to
2179          */
2180         if (cdi->cdda_method == CDDA_BPC_FULL && nframes > 1) {
2181                 printk("cdrom: dropping to single frame dma\n");
2182                 cdi->cdda_method = CDDA_BPC_SINGLE;
2183                 goto retry;
2184         }
2185
2186         /*
2187          * so we have an io error of some sort with multi frame dma. if the
2188          * condition wasn't a hardware error
2189          * problems, not for any error
2190          */
2191         if (cdi->last_sense != 0x04 && cdi->last_sense != 0x0b)
2192                 return ret;
2193
2194         printk("cdrom: dropping to old style cdda (sense=%x)\n", cdi->last_sense);
2195         cdi->cdda_method = CDDA_OLD;
2196         return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);    
2197 }
2198
2199 /* Just about every imaginable ioctl is supported in the Uniform layer
2200  * these days. ATAPI / SCSI specific code now mainly resides in
2201  * mmc_ioct().
2202  */
2203 int cdrom_ioctl(struct file * file, struct cdrom_device_info *cdi,
2204                 struct inode *ip, unsigned int cmd, unsigned long arg)
2205 {
2206         struct cdrom_device_ops *cdo = cdi->ops;
2207         int ret;
2208
2209         /* Try the generic SCSI command ioctl's first.. */
2210         ret = scsi_cmd_ioctl(file, ip->i_bdev->bd_disk, cmd, (void __user *)arg);
2211         if (ret != -ENOTTY)
2212                 return ret;
2213
2214         /* the first few commands do not deal with audio drive_info, but
2215            only with routines in cdrom device operations. */
2216         switch (cmd) {
2217         case CDROMMULTISESSION: {
2218                 struct cdrom_multisession ms_info;
2219                 u_char requested_format;
2220                 cdinfo(CD_DO_IOCTL, "entering CDROMMULTISESSION\n"); 
2221                 if (!(cdo->capability & CDC_MULTI_SESSION))
2222                         return -ENOSYS;
2223                 IOCTL_IN(arg, struct cdrom_multisession, ms_info);
2224                 requested_format = ms_info.addr_format;
2225                 if (!((requested_format == CDROM_MSF) ||
2226                         (requested_format == CDROM_LBA)))
2227                                 return -EINVAL;
2228                 ms_info.addr_format = CDROM_LBA;
2229                 if ((ret=cdo->get_last_session(cdi, &ms_info)))
2230                         return ret;
2231                 sanitize_format(&ms_info.addr, &ms_info.addr_format,
2232                                 requested_format);
2233                 IOCTL_OUT(arg, struct cdrom_multisession, ms_info);
2234                 cdinfo(CD_DO_IOCTL, "CDROMMULTISESSION successful\n"); 
2235                 return 0;
2236                 }
2237
2238         case CDROMEJECT: {
2239                 cdinfo(CD_DO_IOCTL, "entering CDROMEJECT\n"); 
2240                 if (!CDROM_CAN(CDC_OPEN_TRAY))
2241                         return -ENOSYS;
2242                 if (cdi->use_count != 1 || keeplocked)
2243                         return -EBUSY;
2244                 if (CDROM_CAN(CDC_LOCK))
2245                         if ((ret=cdo->lock_door(cdi, 0)))
2246                                 return ret;
2247
2248                 return cdo->tray_move(cdi, 1);
2249                 }
2250
2251         case CDROMCLOSETRAY: {
2252                 cdinfo(CD_DO_IOCTL, "entering CDROMCLOSETRAY\n"); 
2253                 if (!CDROM_CAN(CDC_CLOSE_TRAY))
2254                         return -ENOSYS;
2255                 return cdo->tray_move(cdi, 0);
2256                 }
2257
2258         case CDROMEJECT_SW: {
2259                 cdinfo(CD_DO_IOCTL, "entering CDROMEJECT_SW\n"); 
2260                 if (!CDROM_CAN(CDC_OPEN_TRAY))
2261                         return -ENOSYS;
2262                 if (keeplocked)
2263                         return -EBUSY;
2264                 cdi->options &= ~(CDO_AUTO_CLOSE | CDO_AUTO_EJECT);
2265                 if (arg)
2266                         cdi->options |= CDO_AUTO_CLOSE | CDO_AUTO_EJECT;
2267                 return 0;
2268                 }
2269
2270         case CDROM_MEDIA_CHANGED: {
2271                 struct cdrom_changer_info *info;
2272                 int changed;
2273
2274                 cdinfo(CD_DO_IOCTL, "entering CDROM_MEDIA_CHANGED\n"); 
2275                 if (!CDROM_CAN(CDC_MEDIA_CHANGED))
2276                         return -ENOSYS;
2277
2278                 /* cannot select disc or select current disc */
2279                 if (!CDROM_CAN(CDC_SELECT_DISC) || arg == CDSL_CURRENT)
2280                         return media_changed(cdi, 1);
2281
2282                 if ((unsigned int)arg >= cdi->capacity)
2283                         return -EINVAL;
2284
2285                 info = kmalloc(sizeof(*info), GFP_KERNEL);
2286                 if (!info)
2287                         return -ENOMEM;
2288
2289                 if ((ret = cdrom_read_mech_status(cdi, info))) {
2290                         kfree(info);
2291                         return ret;
2292                 }
2293
2294                 changed = info->slots[arg].change;
2295                 kfree(info);
2296                 return changed;
2297                 }
2298
2299         case CDROM_SET_OPTIONS: {
2300                 cdinfo(CD_DO_IOCTL, "entering CDROM_SET_OPTIONS\n"); 
2301                 /* options need to be in sync with capability. too late for
2302                    that, so we have to check each one separately... */
2303                 switch (arg) {
2304                 case CDO_USE_FFLAGS:
2305                 case CDO_CHECK_TYPE:
2306                         break;
2307                 case CDO_LOCK:
2308                         if (!CDROM_CAN(CDC_LOCK))
2309                                 return -ENOSYS;
2310                         break;
2311                 case 0:
2312                         return cdi->options;
2313                 /* default is basically CDO_[AUTO_CLOSE|AUTO_EJECT] */
2314                 default:
2315                         if (!CDROM_CAN(arg))
2316                                 return -ENOSYS;
2317                 }
2318                 cdi->options |= (int) arg;
2319                 return cdi->options;
2320                 }
2321
2322         case CDROM_CLEAR_OPTIONS: {
2323                 cdinfo(CD_DO_IOCTL, "entering CDROM_CLEAR_OPTIONS\n"); 
2324                 cdi->options &= ~(int) arg;
2325                 return cdi->options;
2326                 }
2327
2328         case CDROM_SELECT_SPEED: {
2329                 cdinfo(CD_DO_IOCTL, "entering CDROM_SELECT_SPEED\n"); 
2330                 if (!CDROM_CAN(CDC_SELECT_SPEED))
2331                         return -ENOSYS;
2332                 return cdo->select_speed(cdi, arg);
2333                 }
2334
2335         case CDROM_SELECT_DISC: {
2336                 cdinfo(CD_DO_IOCTL, "entering CDROM_SELECT_DISC\n"); 
2337                 if (!CDROM_CAN(CDC_SELECT_DISC))
2338                         return -ENOSYS;
2339
2340                 if ((arg != CDSL_CURRENT) && (arg != CDSL_NONE))
2341                         if ((int)arg >= cdi->capacity)
2342                                 return -EINVAL;
2343
2344                 /* cdo->select_disc is a hook to allow a driver-specific
2345                  * way of seleting disc.  However, since there is no
2346                  * equiv hook for cdrom_slot_status this may not 
2347                  * actually be useful...
2348                  */
2349                 if (cdo->select_disc != NULL)
2350                         return cdo->select_disc(cdi, arg);
2351
2352                 /* no driver specific select_disc(), call our own */
2353                 cdinfo(CD_CHANGER, "Using generic cdrom_select_disc()\n"); 
2354                 return cdrom_select_disc(cdi, arg);
2355                 }
2356
2357         case CDROMRESET: {
2358                 if (!capable(CAP_SYS_ADMIN))
2359                         return -EACCES;
2360                 cdinfo(CD_DO_IOCTL, "entering CDROM_RESET\n");
2361                 if (!CDROM_CAN(CDC_RESET))
2362                         return -ENOSYS;
2363                 invalidate_bdev(ip->i_bdev, 0);
2364                 return cdo->reset(cdi);
2365                 }
2366
2367         case CDROM_LOCKDOOR: {
2368                 cdinfo(CD_DO_IOCTL, "%socking door.\n", arg ? "L" : "Unl");
2369                 if (!CDROM_CAN(CDC_LOCK))
2370                         return -EDRIVE_CANT_DO_THIS;
2371                 keeplocked = arg ? 1 : 0;
2372                 /* don't unlock the door on multiple opens,but allow root
2373                  * to do so */
2374                 if ((cdi->use_count != 1) && !arg && !capable(CAP_SYS_ADMIN))
2375                         return -EBUSY;
2376                 return cdo->lock_door(cdi, arg);
2377                 }
2378
2379         case CDROM_DEBUG: {
2380                 if (!capable(CAP_SYS_ADMIN))
2381                         return -EACCES;
2382                 cdinfo(CD_DO_IOCTL, "%sabling debug.\n", arg ? "En" : "Dis");
2383                 debug = arg ? 1 : 0;
2384                 return debug;
2385                 }
2386
2387         case CDROM_GET_CAPABILITY: {
2388                 cdinfo(CD_DO_IOCTL, "entering CDROM_GET_CAPABILITY\n");
2389                 return (cdo->capability & ~cdi->mask);
2390                 }
2391
2392 /* The following function is implemented, although very few audio
2393  * discs give Universal Product Code information, which should just be
2394  * the Medium Catalog Number on the box.  Note, that the way the code
2395  * is written on the CD is /not/ uniform across all discs!
2396  */
2397         case CDROM_GET_MCN: {
2398                 struct cdrom_mcn mcn;
2399                 cdinfo(CD_DO_IOCTL, "entering CDROM_GET_MCN\n"); 
2400                 if (!(cdo->capability & CDC_MCN))
2401                         return -ENOSYS;
2402                 if ((ret=cdo->get_mcn(cdi, &mcn)))
2403                         return ret;
2404                 IOCTL_OUT(arg, struct cdrom_mcn, mcn);
2405                 cdinfo(CD_DO_IOCTL, "CDROM_GET_MCN successful\n"); 
2406                 return 0;
2407                 }
2408
2409         case CDROM_DRIVE_STATUS: {
2410                 cdinfo(CD_DO_IOCTL, "entering CDROM_DRIVE_STATUS\n"); 
2411                 if (!(cdo->capability & CDC_DRIVE_STATUS))
2412                         return -ENOSYS;
2413                 if (!CDROM_CAN(CDC_SELECT_DISC))
2414                         return cdo->drive_status(cdi, CDSL_CURRENT);
2415                 if ((arg == CDSL_CURRENT) || (arg == CDSL_NONE)) 
2416                         return cdo->drive_status(cdi, CDSL_CURRENT);
2417                 if (((int)arg >= cdi->capacity))
2418                         return -EINVAL;
2419                 return cdrom_slot_status(cdi, arg);
2420                 }
2421
2422         /* Ok, this is where problems start.  The current interface for the
2423            CDROM_DISC_STATUS ioctl is flawed.  It makes the false assumption
2424            that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc.  Unfortunatly,
2425            while this is often the case, it is also very common for CDs to
2426            have some tracks with data, and some tracks with audio.  Just 
2427            because I feel like it, I declare the following to be the best
2428            way to cope.  If the CD has ANY data tracks on it, it will be
2429            returned as a data CD.  If it has any XA tracks, I will return
2430            it as that.  Now I could simplify this interface by combining these 
2431            returns with the above, but this more clearly demonstrates
2432            the problem with the current interface.  Too bad this wasn't 
2433            designed to use bitmasks...         -Erik 
2434
2435            Well, now we have the option CDS_MIXED: a mixed-type CD. 
2436            User level programmers might feel the ioctl is not very useful.
2437                                                 ---david
2438         */
2439         case CDROM_DISC_STATUS: {
2440                 tracktype tracks;
2441                 cdinfo(CD_DO_IOCTL, "entering CDROM_DISC_STATUS\n"); 
2442                 cdrom_count_tracks(cdi, &tracks);
2443                 if (tracks.error) 
2444                         return(tracks.error);
2445
2446                 /* Policy mode on */
2447                 if (tracks.audio > 0) {
2448                         if (tracks.data==0 && tracks.cdi==0 && tracks.xa==0) 
2449                                 return CDS_AUDIO;
2450                         else
2451                                 return CDS_MIXED;
2452                 }
2453                 if (tracks.cdi > 0) return CDS_XA_2_2;
2454                 if (tracks.xa > 0) return CDS_XA_2_1;
2455                 if (tracks.data > 0) return CDS_DATA_1;
2456                 /* Policy mode off */
2457
2458                 cdinfo(CD_WARNING,"This disc doesn't have any tracks I recognize!\n");
2459                 return CDS_NO_INFO;
2460                 }
2461
2462         case CDROM_CHANGER_NSLOTS: {
2463                 cdinfo(CD_DO_IOCTL, "entering CDROM_CHANGER_NSLOTS\n"); 
2464                 return cdi->capacity;
2465                 }
2466         }
2467
2468         /* use the ioctls that are implemented through the generic_packet()
2469            interface. this may look at bit funny, but if -ENOTTY is
2470            returned that particular ioctl is not implemented and we
2471            let it go through the device specific ones. */
2472         if (CDROM_CAN(CDC_GENERIC_PACKET)) {
2473                 ret = mmc_ioctl(cdi, cmd, arg);
2474                 if (ret != -ENOTTY) {
2475                         return ret;
2476                 }
2477         }
2478
2479         /* note: most of the cdinfo() calls are commented out here,
2480            because they fill up the sys log when CD players poll
2481            the drive. */
2482         switch (cmd) {
2483         case CDROMSUBCHNL: {
2484                 struct cdrom_subchnl q;
2485                 u_char requested, back;
2486                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2487                         return -ENOSYS;
2488                 /* cdinfo(CD_DO_IOCTL,"entering CDROMSUBCHNL\n");*/ 
2489                 IOCTL_IN(arg, struct cdrom_subchnl, q);
2490                 requested = q.cdsc_format;
2491                 if (!((requested == CDROM_MSF) ||
2492                       (requested == CDROM_LBA)))
2493                         return -EINVAL;
2494                 q.cdsc_format = CDROM_MSF;
2495                 if ((ret=cdo->audio_ioctl(cdi, cmd, &q)))
2496                         return ret;
2497                 back = q.cdsc_format; /* local copy */
2498                 sanitize_format(&q.cdsc_absaddr, &back, requested);
2499                 sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
2500                 IOCTL_OUT(arg, struct cdrom_subchnl, q);
2501                 /* cdinfo(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */ 
2502                 return 0;
2503                 }
2504         case CDROMREADTOCHDR: {
2505                 struct cdrom_tochdr header;
2506                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2507                         return -ENOSYS;
2508                 /* cdinfo(CD_DO_IOCTL, "entering CDROMREADTOCHDR\n"); */ 
2509                 IOCTL_IN(arg, struct cdrom_tochdr, header);
2510                 if ((ret=cdo->audio_ioctl(cdi, cmd, &header)))
2511                         return ret;
2512                 IOCTL_OUT(arg, struct cdrom_tochdr, header);
2513                 /* cdinfo(CD_DO_IOCTL, "CDROMREADTOCHDR successful\n"); */ 
2514                 return 0;
2515                 }
2516         case CDROMREADTOCENTRY: {
2517                 struct cdrom_tocentry entry;
2518                 u_char requested_format;
2519                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2520                         return -ENOSYS;
2521                 /* cdinfo(CD_DO_IOCTL, "entering CDROMREADTOCENTRY\n"); */ 
2522                 IOCTL_IN(arg, struct cdrom_tocentry, entry);
2523                 requested_format = entry.cdte_format;
2524                 if (!((requested_format == CDROM_MSF) || 
2525                         (requested_format == CDROM_LBA)))
2526                                 return -EINVAL;
2527                 /* make interface to low-level uniform */
2528                 entry.cdte_format = CDROM_MSF;
2529                 if ((ret=cdo->audio_ioctl(cdi, cmd, &entry)))
2530                         return ret;
2531                 sanitize_format(&entry.cdte_addr,
2532                 &entry.cdte_format, requested_format);
2533                 IOCTL_OUT(arg, struct cdrom_tocentry, entry);
2534                 /* cdinfo(CD_DO_IOCTL, "CDROMREADTOCENTRY successful\n"); */ 
2535                 return 0;
2536                 }
2537         case CDROMPLAYMSF: {
2538                 struct cdrom_msf msf;
2539                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2540                         return -ENOSYS;
2541                 cdinfo(CD_DO_IOCTL, "entering CDROMPLAYMSF\n"); 
2542                 IOCTL_IN(arg, struct cdrom_msf, msf);
2543                 return cdo->audio_ioctl(cdi, cmd, &msf);
2544                 }
2545         case CDROMPLAYTRKIND: {
2546                 struct cdrom_ti ti;
2547                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2548                         return -ENOSYS;
2549                 cdinfo(CD_DO_IOCTL, "entering CDROMPLAYTRKIND\n"); 
2550                 IOCTL_IN(arg, struct cdrom_ti, ti);
2551                 CHECKAUDIO;
2552                 return cdo->audio_ioctl(cdi, cmd, &ti);
2553                 }
2554         case CDROMVOLCTRL: {
2555                 struct cdrom_volctrl volume;
2556                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2557                         return -ENOSYS;
2558                 cdinfo(CD_DO_IOCTL, "entering CDROMVOLCTRL\n"); 
2559                 IOCTL_IN(arg, struct cdrom_volctrl, volume);
2560                 return cdo->audio_ioctl(cdi, cmd, &volume);
2561                 }
2562         case CDROMVOLREAD: {
2563                 struct cdrom_volctrl volume;
2564                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2565                         return -ENOSYS;
2566                 cdinfo(CD_DO_IOCTL, "entering CDROMVOLREAD\n"); 
2567                 if ((ret=cdo->audio_ioctl(cdi, cmd, &volume)))
2568                         return ret;
2569                 IOCTL_OUT(arg, struct cdrom_volctrl, volume);
2570                 return 0;
2571                 }
2572         case CDROMSTART:
2573         case CDROMSTOP:
2574         case CDROMPAUSE:
2575         case CDROMRESUME: {
2576                 if (!CDROM_CAN(CDC_PLAY_AUDIO))
2577                         return -ENOSYS;
2578                 cdinfo(CD_DO_IOCTL, "doing audio ioctl (start/stop/pause/resume)\n"); 
2579                 CHECKAUDIO;
2580                 return cdo->audio_ioctl(cdi, cmd, NULL);
2581                 }
2582         } /* switch */
2583
2584         /* do the device specific ioctls */
2585         if (CDROM_CAN(CDC_IOCTLS))
2586                 return cdo->dev_ioctl(cdi, cmd, arg);
2587         
2588         return -ENOSYS;
2589 }
2590
2591 static inline
2592 int msf_to_lba(char m, char s, char f)
2593 {
2594         return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
2595 }
2596
2597 /*
2598  * Required when we need to use READ_10 to issue other than 2048 block
2599  * reads
2600  */
2601 static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
2602 {
2603         struct cdrom_device_ops *cdo = cdi->ops;
2604         struct packet_command cgc;
2605         struct modesel_head mh;
2606
2607         memset(&mh, 0, sizeof(mh));
2608         mh.block_desc_length = 0x08;
2609         mh.block_length_med = (size >> 8) & 0xff;
2610         mh.block_length_lo = size & 0xff;
2611
2612         memset(&cgc, 0, sizeof(cgc));
2613         cgc.cmd[0] = 0x15;
2614         cgc.cmd[1] = 1 << 4;
2615         cgc.cmd[4] = 12;
2616         cgc.buflen = sizeof(mh);
2617         cgc.buffer = (char *) &mh;
2618         cgc.data_direction = CGC_DATA_WRITE;
2619         mh.block_desc_length = 0x08;
2620         mh.block_length_med = (size >> 8) & 0xff;
2621         mh.block_length_lo = size & 0xff;
2622
2623         return cdo->generic_packet(cdi, &cgc);
2624 }
2625
2626 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
2627                      unsigned long arg)
2628 {               
2629         struct cdrom_device_ops *cdo = cdi->ops;
2630         struct packet_command cgc;
2631         struct request_sense sense;
2632         unsigned char buffer[32];
2633         int ret = 0;
2634
2635         memset(&cgc, 0, sizeof(cgc));
2636
2637         /* build a unified command and queue it through
2638            cdo->generic_packet() */
2639         switch (cmd) {
2640         case CDROMREADRAW:
2641         case CDROMREADMODE1:
2642         case CDROMREADMODE2: {
2643                 struct cdrom_msf msf;
2644                 int blocksize = 0, format = 0, lba;
2645                 
2646                 switch (cmd) {
2647                 case CDROMREADRAW:
2648                         blocksize = CD_FRAMESIZE_RAW;
2649                         break;
2650                 case CDROMREADMODE1:
2651                         blocksize = CD_FRAMESIZE;
2652                         format = 2;
2653                         break;
2654                 case CDROMREADMODE2:
2655                         blocksize = CD_FRAMESIZE_RAW0;
2656                         break;
2657                 }
2658                 IOCTL_IN(arg, struct cdrom_msf, msf);
2659                 lba = msf_to_lba(msf.cdmsf_min0,msf.cdmsf_sec0,msf.cdmsf_frame0);
2660                 /* FIXME: we need upper bound checking, too!! */
2661                 if (lba < 0)
2662                         return -EINVAL;
2663                 cgc.buffer = (char *) kmalloc(blocksize, GFP_KERNEL);
2664                 if (cgc.buffer == NULL)
2665                         return -ENOMEM;
2666                 memset(&sense, 0, sizeof(sense));
2667                 cgc.sense = &sense;
2668                 cgc.data_direction = CGC_DATA_READ;
2669                 ret = cdrom_read_block(cdi, &cgc, lba, 1, format, blocksize);
2670                 if (ret && sense.sense_key==0x05 && sense.asc==0x20 && sense.ascq==0x00) {
2671                         /*
2672                          * SCSI-II devices are not required to support
2673                          * READ_CD, so let's try switching block size
2674                          */
2675                         /* FIXME: switch back again... */
2676                         if ((ret = cdrom_switch_blocksize(cdi, blocksize))) {
2677                                 kfree(cgc.buffer);
2678                                 return ret;
2679                         }
2680                         cgc.sense = NULL;
2681                         ret = cdrom_read_cd(cdi, &cgc, lba, blocksize, 1);
2682                         ret |= cdrom_switch_blocksize(cdi, blocksize);
2683                 }
2684                 if (!ret && copy_to_user((char __user *)arg, cgc.buffer, blocksize))
2685                         ret = -EFAULT;
2686                 kfree(cgc.buffer);
2687                 return ret;
2688                 }
2689         case CDROMREADAUDIO: {
2690                 struct cdrom_read_audio ra;
2691                 int lba;
2692
2693                 IOCTL_IN(arg, struct cdrom_read_audio, ra);
2694
2695                 if (ra.addr_format == CDROM_MSF)
2696                         lba = msf_to_lba(ra.addr.msf.minute,
2697                                          ra.addr.msf.second,
2698                                          ra.addr.msf.frame);
2699                 else if (ra.addr_format == CDROM_LBA)
2700                         lba = ra.addr.lba;
2701                 else
2702                         return -EINVAL;
2703
2704                 /* FIXME: we need upper bound checking, too!! */
2705                 if (lba < 0 || ra.nframes <= 0 || ra.nframes > CD_FRAMES)
2706                         return -EINVAL;
2707
2708                 return cdrom_read_cdda(cdi, ra.buf, lba, ra.nframes);
2709                 }
2710         case CDROMSUBCHNL: {
2711                 struct cdrom_subchnl q;
2712                 u_char requested, back;
2713                 IOCTL_IN(arg, struct cdrom_subchnl, q);
2714                 requested = q.cdsc_format;
2715                 if (!((requested == CDROM_MSF) ||
2716                       (requested == CDROM_LBA)))
2717                         return -EINVAL;
2718                 q.cdsc_format = CDROM_MSF;
2719                 if ((ret = cdrom_read_subchannel(cdi, &q, 0)))
2720                         return ret;
2721                 back = q.cdsc_format; /* local copy */
2722                 sanitize_format(&q.cdsc_absaddr, &back, requested);
2723                 sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
2724                 IOCTL_OUT(arg, struct cdrom_subchnl, q);
2725                 /* cdinfo(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */ 
2726                 return 0;
2727                 }
2728         case CDROMPLAYMSF: {
2729                 struct cdrom_msf msf;
2730                 cdinfo(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
2731                 IOCTL_IN(arg, struct cdrom_msf, msf);
2732                 cgc.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
2733                 cgc.cmd[3] = msf.cdmsf_min0;
2734                 cgc.cmd[4] = msf.cdmsf_sec0;
2735                 cgc.cmd[5] = msf.cdmsf_frame0;
2736                 cgc.cmd[6] = msf.cdmsf_min1;
2737                 cgc.cmd[7] = msf.cdmsf_sec1;
2738                 cgc.cmd[8] = msf.cdmsf_frame1;
2739                 cgc.data_direction = CGC_DATA_NONE;
2740                 return cdo->generic_packet(cdi, &cgc);
2741                 }
2742         case CDROMPLAYBLK: {
2743                 struct cdrom_blk blk;
2744                 cdinfo(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
2745                 IOCTL_IN(arg, struct cdrom_blk, blk);
2746                 cgc.cmd[0] = GPCMD_PLAY_AUDIO_10;
2747                 cgc.cmd[2] = (blk.from >> 24) & 0xff;
2748                 cgc.cmd[3] = (blk.from >> 16) & 0xff;
2749                 cgc.cmd[4] = (blk.from >>  8) & 0xff;
2750                 cgc.cmd[5] = blk.from & 0xff;
2751                 cgc.cmd[7] = (blk.len >> 8) & 0xff;
2752                 cgc.cmd[8] = blk.len & 0xff;
2753                 cgc.data_direction = CGC_DATA_NONE;
2754                 return cdo->generic_packet(cdi, &cgc);
2755                 }
2756         case CDROMVOLCTRL:
2757         case CDROMVOLREAD: {
2758                 struct cdrom_volctrl volctrl;
2759                 char mask[sizeof(buffer)];
2760                 unsigned short offset;
2761
2762                 cdinfo(CD_DO_IOCTL, "entering CDROMVOLUME\n");
2763
2764                 IOCTL_IN(arg, struct cdrom_volctrl, volctrl);
2765
2766                 cgc.buffer = buffer;
2767                 cgc.buflen = 24;
2768                 if ((ret = cdrom_mode_sense(cdi, &cgc, GPMODE_AUDIO_CTL_PAGE, 0)))
2769                     return ret;
2770                 
2771                 /* originally the code depended on buffer[1] to determine
2772                    how much data is available for transfer. buffer[1] is
2773                    unfortunately ambigious and the only reliable way seem
2774                    to be to simply skip over the block descriptor... */
2775                 offset = 8 + be16_to_cpu(*(unsigned short *)(buffer+6));
2776
2777                 if (offset + 16 > sizeof(buffer))
2778                         return -E2BIG;
2779
2780                 if (offset + 16 > cgc.buflen) {
2781                         cgc.buflen = offset+16;
2782                         ret = cdrom_mode_sense(cdi, &cgc,
2783                                                 GPMODE_AUDIO_CTL_PAGE, 0);
2784                         if (ret)
2785                                 return ret;
2786                 }
2787
2788                 /* sanity check */
2789                 if ((buffer[offset] & 0x3f) != GPMODE_AUDIO_CTL_PAGE ||
2790                                 buffer[offset+1] < 14)
2791                         return -EINVAL;
2792
2793                 /* now we have the current volume settings. if it was only
2794                    a CDROMVOLREAD, return these values */
2795                 if (cmd == CDROMVOLREAD) {
2796                         volctrl.channel0 = buffer[offset+9];
2797                         volctrl.channel1 = buffer[offset+11];
2798                         volctrl.channel2 = buffer[offset+13];
2799                         volctrl.channel3 = buffer[offset+15];
2800                         IOCTL_OUT(arg, struct cdrom_volctrl, volctrl);
2801                         return 0;
2802                 }
2803                 
2804                 /* get the volume mask */
2805                 cgc.buffer = mask;
2806                 if ((ret = cdrom_mode_sense(cdi, &cgc, 
2807                                 GPMODE_AUDIO_CTL_PAGE, 1)))
2808                         return ret;
2809
2810                 buffer[offset+9] = volctrl.channel0 & mask[offset+9];
2811                 buffer[offset+11] = volctrl.channel1 & mask[offset+11];
2812                 buffer[offset+13] = volctrl.channel2 & mask[offset+13];
2813                 buffer[offset+15] = volctrl.channel3 & mask[offset+15];
2814
2815                 /* set volume */
2816                 cgc.buffer = buffer + offset - 8;
2817                 memset(cgc.buffer, 0, 8);
2818                 return cdrom_mode_select(cdi, &cgc);
2819                 }
2820
2821         case CDROMSTART:
2822         case CDROMSTOP: {
2823                 cdinfo(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n"); 
2824                 cgc.cmd[0] = GPCMD_START_STOP_UNIT;
2825                 cgc.cmd[1] = 1;
2826                 cgc.cmd[4] = (cmd == CDROMSTART) ? 1 : 0;
2827                 cgc.data_direction = CGC_DATA_NONE;
2828                 return cdo->generic_packet(cdi, &cgc);
2829                 }
2830
2831         case CDROMPAUSE:
2832         case CDROMRESUME: {
2833                 cdinfo(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n"); 
2834                 cgc.cmd[0] = GPCMD_PAUSE_RESUME;
2835                 cgc.cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
2836                 cgc.data_direction = CGC_DATA_NONE;
2837                 return cdo->generic_packet(cdi, &cgc);
2838                 }
2839
2840         case DVD_READ_STRUCT: {
2841                 dvd_struct *s;
2842                 int size = sizeof(dvd_struct);
2843                 if (!CDROM_CAN(CDC_DVD))
2844                         return -ENOSYS;
2845                 if ((s = (dvd_struct *) kmalloc(size, GFP_KERNEL)) == NULL)
2846                         return -ENOMEM;
2847                 cdinfo(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n"); 
2848                 if (copy_from_user(s, (dvd_struct __user *)arg, size)) {
2849                         kfree(s);
2850                         return -EFAULT;
2851                 }
2852                 if ((ret = dvd_read_struct(cdi, s))) {
2853                         kfree(s);
2854                         return ret;
2855                 }
2856                 if (copy_to_user((dvd_struct __user *)arg, s, size))
2857                         ret = -EFAULT;
2858                 kfree(s);
2859                 return ret;
2860                 }
2861
2862         case DVD_AUTH: {
2863                 dvd_authinfo ai;
2864                 if (!CDROM_CAN(CDC_DVD))
2865                         return -ENOSYS;
2866                 cdinfo(CD_DO_IOCTL, "entering DVD_AUTH\n"); 
2867                 IOCTL_IN(arg, dvd_authinfo, ai);
2868                 if ((ret = dvd_do_auth (cdi, &ai)))
2869                         return ret;
2870                 IOCTL_OUT(arg, dvd_authinfo, ai);
2871                 return 0;
2872                 }
2873
2874         case CDROM_NEXT_WRITABLE: {
2875                 long next = 0;
2876                 cdinfo(CD_DO_IOCTL, "entering CDROM_NEXT_WRITABLE\n"); 
2877                 if ((ret = cdrom_get_next_writable(cdi, &next)))
2878                         return ret;
2879                 IOCTL_OUT(arg, long, next);
2880                 return 0;
2881                 }
2882         case CDROM_LAST_WRITTEN: {
2883                 long last = 0;
2884                 cdinfo(CD_DO_IOCTL, "entering CDROM_LAST_WRITTEN\n"); 
2885                 if ((ret = cdrom_get_last_written(cdi, &last)))
2886                         return ret;
2887                 IOCTL_OUT(arg, long, last);
2888                 return 0;
2889                 }
2890         } /* switch */
2891
2892         return -ENOTTY;
2893 }
2894
2895 static int cdrom_get_track_info(struct cdrom_device_info *cdi, __u16 track, __u8 type,
2896                          track_information *ti)
2897 {
2898         struct cdrom_device_ops *cdo = cdi->ops;
2899         struct packet_command cgc;
2900         int ret, buflen;
2901
2902         init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
2903         cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
2904         cgc.cmd[1] = type & 3;
2905         cgc.cmd[4] = (track & 0xff00) >> 8;
2906         cgc.cmd[5] = track & 0xff;
2907         cgc.cmd[8] = 8;
2908         cgc.quiet = 1;
2909
2910         if ((ret = cdo->generic_packet(cdi, &cgc)))
2911                 return ret;
2912         
2913         buflen = be16_to_cpu(ti->track_information_length) +
2914                      sizeof(ti->track_information_length);
2915
2916         if (buflen > sizeof(track_information))
2917                 buflen = sizeof(track_information);
2918
2919         cgc.cmd[8] = cgc.buflen = buflen;
2920         if ((ret = cdo->generic_packet(cdi, &cgc)))
2921                 return ret;
2922
2923         /* return actual fill size */
2924         return buflen;
2925 }
2926
2927 /* requires CD R/RW */
2928 static int cdrom_get_disc_info(struct cdrom_device_info *cdi, disc_information *di)
2929 {
2930         struct cdrom_device_ops *cdo = cdi->ops;
2931         struct packet_command cgc;
2932         int ret, buflen;
2933
2934         /* set up command and get the disc info */
2935         init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
2936         cgc.cmd[0] = GPCMD_READ_DISC_INFO;
2937         cgc.cmd[8] = cgc.buflen = 2;
2938         cgc.quiet = 1;
2939
2940         if ((ret = cdo->generic_packet(cdi, &cgc)))
2941                 return ret;
2942
2943         /* not all drives have the same disc_info length, so requeue
2944          * packet with the length the drive tells us it can supply
2945          */
2946         buflen = be16_to_cpu(di->disc_information_length) +
2947                      sizeof(di->disc_information_length);
2948
2949         if (buflen > sizeof(disc_information))
2950                 buflen = sizeof(disc_information);
2951
2952         cgc.cmd[8] = cgc.buflen = buflen;
2953         if ((ret = cdo->generic_packet(cdi, &cgc)))
2954                 return ret;
2955
2956         /* return actual fill size */
2957         return buflen;
2958 }
2959
2960 /* return the last written block on the CD-R media. this is for the udf
2961    file system. */
2962 int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written)
2963 {
2964         struct cdrom_tocentry toc;
2965         disc_information di;
2966         track_information ti;
2967         __u32 last_track;
2968         int ret = -1, ti_size;
2969
2970         if (!CDROM_CAN(CDC_GENERIC_PACKET))
2971                 goto use_toc;
2972
2973         ret = cdrom_get_disc_info(cdi, &di);
2974         if (ret < (int)(offsetof(typeof(di), last_track_lsb)
2975                         + sizeof(di.last_track_lsb)))
2976                 goto use_toc;
2977
2978         /* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
2979         last_track = (di.last_track_msb << 8) | di.last_track_lsb;
2980         ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
2981         if (ti_size < (int)offsetof(typeof(ti), track_start))
2982                 goto use_toc;
2983
2984         /* if this track is blank, try the previous. */
2985         if (ti.blank) {
2986                 if (last_track==1)
2987                         goto use_toc;
2988                 last_track--;
2989                 ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
2990         }
2991
2992         if (ti_size < (int)(offsetof(typeof(ti), track_size)
2993                                 + sizeof(ti.track_size)))
2994                 goto use_toc;
2995
2996         /* if last recorded field is valid, return it. */
2997         if (ti.lra_v && ti_size >= (int)(offsetof(typeof(ti), last_rec_address)
2998                                 + sizeof(ti.last_rec_address))) {
2999                 *last_written = be32_to_cpu(ti.last_rec_address);
3000         } else {
3001                 /* make it up instead */
3002                 *last_written = be32_to_cpu(ti.track_start) +
3003                                 be32_to_cpu(ti.track_size);
3004                 if (ti.free_blocks)
3005                         *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
3006         }
3007         return 0;
3008
3009         /* this is where we end up if the drive either can't do a
3010            GPCMD_READ_DISC_INFO or GPCMD_READ_TRACK_RZONE_INFO or if
3011            it doesn't give enough information or fails. then we return
3012            the toc contents. */
3013 use_toc:
3014         toc.cdte_format = CDROM_MSF;
3015         toc.cdte_track = CDROM_LEADOUT;
3016         if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &toc)))
3017                 return ret;
3018         sanitize_format(&toc.cdte_addr, &toc.cdte_format, CDROM_LBA);
3019         *last_written = toc.cdte_addr.lba;
3020         return 0;
3021 }
3022
3023 /* return the next writable block. also for udf file system. */
3024 static int cdrom_get_next_writable(struct cdrom_device_info *cdi, long *next_writable)
3025 {
3026         disc_information di;
3027         track_information ti;
3028         __u16 last_track;
3029         int ret, ti_size;
3030
3031         if (!CDROM_CAN(CDC_GENERIC_PACKET))
3032                 goto use_last_written;
3033
3034         ret = cdrom_get_disc_info(cdi, &di);
3035         if (ret < 0 || ret < offsetof(typeof(di), last_track_lsb)
3036                                 + sizeof(di.last_track_lsb))
3037                 goto use_last_written;
3038
3039         /* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
3040         last_track = (di.last_track_msb << 8) | di.last_track_lsb;
3041         ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
3042         if (ti_size < 0 || ti_size < offsetof(typeof(ti), track_start))
3043                 goto use_last_written;
3044
3045         /* if this track is blank, try the previous. */
3046         if (ti.blank) {
3047                 if (last_track == 1)
3048                         goto use_last_written;
3049                 last_track--;
3050                 ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
3051                 if (ti_size < 0)
3052                         goto use_last_written;
3053         }
3054
3055         /* if next recordable address field is valid, use it. */
3056         if (ti.nwa_v && ti_size >= offsetof(typeof(ti), next_writable)
3057                                 + sizeof(ti.next_writable)) {
3058                 *next_writable = be32_to_cpu(ti.next_writable);
3059                 return 0;
3060         }
3061
3062 use_last_written:
3063         if ((ret = cdrom_get_last_written(cdi, next_writable))) {
3064                 *next_writable = 0;
3065                 return ret;
3066         } else {
3067                 *next_writable += 7;
3068                 return 0;
3069         }
3070 }
3071
3072 EXPORT_SYMBOL(cdrom_get_last_written);
3073 EXPORT_SYMBOL(register_cdrom);
3074 EXPORT_SYMBOL(unregister_cdrom);
3075 EXPORT_SYMBOL(cdrom_open);
3076 EXPORT_SYMBOL(cdrom_release);
3077 EXPORT_SYMBOL(cdrom_ioctl);
3078 EXPORT_SYMBOL(cdrom_media_changed);
3079 EXPORT_SYMBOL(cdrom_number_of_slots);
3080 EXPORT_SYMBOL(cdrom_mode_select);
3081 EXPORT_SYMBOL(cdrom_mode_sense);
3082 EXPORT_SYMBOL(init_cdrom_command);
3083 EXPORT_SYMBOL(cdrom_get_media_event);
3084
3085 #ifdef CONFIG_SYSCTL
3086
3087 #define CDROM_STR_SIZE 1000
3088
3089 static struct cdrom_sysctl_settings {
3090         char    info[CDROM_STR_SIZE];   /* general info */
3091         int     autoclose;              /* close tray upon mount, etc */
3092         int     autoeject;              /* eject on umount */
3093         int     debug;                  /* turn on debugging messages */
3094         int     lock;                   /* lock the door on device open */
3095         int     check;                  /* check media type */
3096 } cdrom_sysctl_settings;
3097
3098 static int cdrom_sysctl_info(ctl_table *ctl, int write, struct file * filp,
3099                            void __user *buffer, size_t *lenp, loff_t *ppos)
3100 {
3101         int pos;
3102         struct cdrom_device_info *cdi;
3103         char *info = cdrom_sysctl_settings.info;
3104         
3105         if (!*lenp || (*ppos && !write)) {
3106                 *lenp = 0;
3107                 return 0;
3108         }
3109
3110         pos = sprintf(info, "CD-ROM information, " VERSION "\n");
3111         
3112         pos += sprintf(info+pos, "\ndrive name:\t");
3113         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3114             pos += sprintf(info+pos, "\t%s", cdi->name);
3115
3116         pos += sprintf(info+pos, "\ndrive speed:\t");
3117         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3118             pos += sprintf(info+pos, "\t%d", cdi->speed);
3119
3120         pos += sprintf(info+pos, "\ndrive # of slots:");
3121         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3122             pos += sprintf(info+pos, "\t%d", cdi->capacity);
3123
3124         pos += sprintf(info+pos, "\nCan close tray:\t");
3125         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3126             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_CLOSE_TRAY) != 0);
3127
3128         pos += sprintf(info+pos, "\nCan open tray:\t");
3129         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3130             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_OPEN_TRAY) != 0);
3131
3132         pos += sprintf(info+pos, "\nCan lock tray:\t");
3133         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3134             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_LOCK) != 0);
3135
3136         pos += sprintf(info+pos, "\nCan change speed:");
3137         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3138             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_SELECT_SPEED) != 0);
3139
3140         pos += sprintf(info+pos, "\nCan select disk:");
3141         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3142             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_SELECT_DISC) != 0);
3143
3144         pos += sprintf(info+pos, "\nCan read multisession:");
3145         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3146             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MULTI_SESSION) != 0);
3147
3148         pos += sprintf(info+pos, "\nCan read MCN:\t");
3149         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3150             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MCN) != 0);
3151
3152         pos += sprintf(info+pos, "\nReports media changed:");
3153         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3154             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MEDIA_CHANGED) != 0);
3155
3156         pos += sprintf(info+pos, "\nCan play audio:\t");
3157         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3158             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_PLAY_AUDIO) != 0);
3159
3160         pos += sprintf(info+pos, "\nCan write CD-R:\t");
3161         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3162             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_CD_R) != 0);
3163
3164         pos += sprintf(info+pos, "\nCan write CD-RW:");
3165         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3166             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_CD_RW) != 0);
3167
3168         pos += sprintf(info+pos, "\nCan read DVD:\t");
3169         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3170             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_DVD) != 0);
3171
3172         pos += sprintf(info+pos, "\nCan write DVD-R:");
3173         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3174             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_DVD_R) != 0);
3175
3176         pos += sprintf(info+pos, "\nCan write DVD-RAM:");
3177         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3178             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_DVD_RAM) != 0);
3179
3180         pos += sprintf(info+pos, "\nCan read MRW:\t");
3181         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3182             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MRW) != 0);
3183
3184         pos += sprintf(info+pos, "\nCan write MRW:\t");
3185         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3186             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MRW_W) != 0);
3187
3188         pos += sprintf(info+pos, "\nCan write RAM:\t");
3189         for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
3190             pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_RAM) != 0);
3191
3192         strcpy(info+pos,"\n\n");
3193                 
3194         return proc_dostring(ctl, write, filp, buffer, lenp, ppos);
3195 }
3196
3197 /* Unfortunately, per device settings are not implemented through
3198    procfs/sysctl yet. When they are, this will naturally disappear. For now
3199    just update all drives. Later this will become the template on which
3200    new registered drives will be based. */
3201 static void cdrom_update_settings(void)
3202 {
3203         struct cdrom_device_info *cdi;
3204
3205         for (cdi = topCdromPtr; cdi != NULL; cdi = cdi->next) {
3206                 if (autoclose && CDROM_CAN(CDC_CLOSE_TRAY))
3207                         cdi->options |= CDO_AUTO_CLOSE;
3208                 else if (!autoclose)
3209                         cdi->options &= ~CDO_AUTO_CLOSE;
3210                 if (autoeject && CDROM_CAN(CDC_OPEN_TRAY))
3211                         cdi->options |= CDO_AUTO_EJECT;
3212                 else if (!autoeject)
3213                         cdi->options &= ~CDO_AUTO_EJECT;
3214                 if (lockdoor && CDROM_CAN(CDC_LOCK))
3215                         cdi->options |= CDO_LOCK;
3216                 else if (!lockdoor)
3217                         cdi->options &= ~CDO_LOCK;
3218                 if (check_media_type)
3219                         cdi->options |= CDO_CHECK_TYPE;
3220                 else
3221                         cdi->options &= ~CDO_CHECK_TYPE;
3222         }
3223 }
3224
3225 static int cdrom_sysctl_handler(ctl_table *ctl, int write, struct file * filp,
3226                                 void __user *buffer, size_t *lenp, loff_t *ppos)
3227 {
3228         int *valp = ctl->data;
3229         int val = *valp;
3230         int ret;
3231         
3232         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3233
3234         if (write && *valp != val) {
3235         
3236                 /* we only care for 1 or 0. */
3237                 if (*valp)
3238                         *valp = 1;
3239                 else
3240                         *valp = 0;
3241
3242                 switch (ctl->ctl_name) {
3243                 case DEV_CDROM_AUTOCLOSE: {
3244                         if (valp == &cdrom_sysctl_settings.autoclose)
3245                                 autoclose = cdrom_sysctl_settings.autoclose;
3246                         break;
3247                         }
3248                 case DEV_CDROM_AUTOEJECT: {
3249                         if (valp == &cdrom_sysctl_settings.autoeject)
3250                                 autoeject = cdrom_sysctl_settings.autoeject;
3251                         break;
3252                         }
3253                 case DEV_CDROM_DEBUG: {
3254                         if (valp == &cdrom_sysctl_settings.debug)
3255                                 debug = cdrom_sysctl_settings.debug;
3256                         break;
3257                         }
3258                 case DEV_CDROM_LOCK: {
3259                         if (valp == &cdrom_sysctl_settings.lock)
3260                                 lockdoor = cdrom_sysctl_settings.lock;
3261                         break;
3262                         }
3263                 case DEV_CDROM_CHECK_MEDIA: {
3264                         if (valp == &cdrom_sysctl_settings.check)
3265                                 check_media_type = cdrom_sysctl_settings.check;
3266                         break;
3267                         }
3268                 }
3269                 /* update the option flags according to the changes. we
3270                    don't have per device options through sysctl yet,
3271                    but we will have and then this will disappear. */
3272                 cdrom_update_settings();
3273         }
3274
3275         return ret;
3276 }
3277
3278 /* Place files in /proc/sys/dev/cdrom */
3279 static ctl_table cdrom_table[] = {
3280         {
3281                 .ctl_name       = DEV_CDROM_INFO,
3282                 .procname       = "info",
3283                 .data           = &cdrom_sysctl_settings.info, 
3284                 .maxlen         = CDROM_STR_SIZE,
3285                 .mode           = 0444,
3286                 .proc_handler   = &cdrom_sysctl_info,
3287         },
3288         {
3289                 .ctl_name       = DEV_CDROM_AUTOCLOSE,
3290                 .procname       = "autoclose",
3291                 .data           = &cdrom_sysctl_settings.autoclose,
3292                 .maxlen         = sizeof(int),
3293                 .mode           = 0644,
3294                 .proc_handler   = &cdrom_sysctl_handler,
3295         },
3296         {
3297                 .ctl_name       = DEV_CDROM_AUTOEJECT,
3298                 .procname       = "autoeject",
3299                 .data           = &cdrom_sysctl_settings.autoeject,
3300                 .maxlen         = sizeof(int),
3301                 .mode           = 0644,
3302                 .proc_handler   = &cdrom_sysctl_handler,
3303         },
3304         {
3305                 .ctl_name       = DEV_CDROM_DEBUG,
3306                 .procname       = "debug",
3307                 .data           = &cdrom_sysctl_settings.debug,
3308                 .maxlen         = sizeof(int),
3309                 .mode           = 0644,
3310                 .proc_handler   = &cdrom_sysctl_handler,
3311         },
3312         {
3313                 .ctl_name       = DEV_CDROM_LOCK,
3314                 .procname       = "lock",
3315                 .data           = &cdrom_sysctl_settings.lock,
3316                 .maxlen         = sizeof(int),
3317                 .mode           = 0644,
3318                 .proc_handler   = &cdrom_sysctl_handler,
3319         },
3320         {
3321                 .ctl_name       = DEV_CDROM_CHECK_MEDIA,
3322                 .procname       = "check_media",
3323                 .data           = &cdrom_sysctl_settings.check,
3324                 .maxlen         = sizeof(int),
3325                 .mode           = 0644,
3326                 .proc_handler   = &cdrom_sysctl_handler
3327         },
3328         { .ctl_name = 0 }
3329 };
3330
3331 static ctl_table cdrom_cdrom_table[] = {
3332         {
3333                 .ctl_name       = DEV_CDROM,
3334                 .procname       = "cdrom",
3335                 .maxlen         = 0,
3336                 .mode           = 0555,
3337                 .child          = cdrom_table,
3338         },
3339         { .ctl_name = 0 }
3340 };
3341
3342 /* Make sure that /proc/sys/dev is there */
3343 static ctl_table cdrom_root_table[] = {
3344         {
3345                 .ctl_name       = CTL_DEV,
3346                 .procname       = "dev",
3347                 .maxlen         = 0,
3348                 .mode           = 0555,
3349                 .child          = cdrom_cdrom_table,
3350         },
3351         { .ctl_name = 0 }
3352 };
3353 static struct ctl_table_header *cdrom_sysctl_header;
3354
3355 static void cdrom_sysctl_register(void)
3356 {
3357         static int initialized;
3358
3359         if (initialized == 1)
3360                 return;
3361
3362         cdrom_sysctl_header = register_sysctl_table(cdrom_root_table, 1);
3363         if (cdrom_root_table->ctl_name && cdrom_root_table->child->de)
3364                 cdrom_root_table->child->de->owner = THIS_MODULE;
3365
3366         /* set the defaults */
3367         cdrom_sysctl_settings.autoclose = autoclose;
3368         cdrom_sysctl_settings.autoeject = autoeject;
3369         cdrom_sysctl_settings.debug = debug;
3370         cdrom_sysctl_settings.lock = lockdoor;
3371         cdrom_sysctl_settings.check = check_media_type;
3372
3373         initialized = 1;
3374 }
3375
3376 static void cdrom_sysctl_unregister(void)
3377 {
3378         if (cdrom_sysctl_header)
3379                 unregister_sysctl_table(cdrom_sysctl_header);
3380 }
3381
3382 #endif /* CONFIG_SYSCTL */
3383
3384 static int __init cdrom_init(void)
3385 {
3386 #ifdef CONFIG_SYSCTL
3387         cdrom_sysctl_register();
3388 #endif
3389         return 0;
3390 }
3391
3392 static void __exit cdrom_exit(void)
3393 {
3394         printk(KERN_INFO "Uniform CD-ROM driver unloaded\n");
3395 #ifdef CONFIG_SYSCTL
3396         cdrom_sysctl_unregister();
3397 #endif
3398 }
3399
3400 module_init(cdrom_init);
3401 module_exit(cdrom_exit);
3402 MODULE_LICENSE("GPL");