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mtd_blktrans_ops->release() should return void
[linux-block.git] / drivers / block / paride / pcd.c
CommitLineData
1da177e4
LT		 1/*
2 pcd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 This is a high-level driver for parallel port ATAPI CD-ROM
6 drives based on chips supported by the paride module.
7
8 By default, the driver will autoprobe for a single parallel
9 port ATAPI CD-ROM drive, but if their individual parameters are
10 specified, the driver can handle up to 4 drives.
11
12 The behaviour of the pcd driver can be altered by setting
13 some parameters from the insmod command line. The following
14 parameters are adjustable:
15
16 drive0 These four arguments can be arrays of
17 drive1 1-6 integers as follows:
18 drive2
19 drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
20
21 Where,
22
23 <prt> is the base of the parallel port address for
24 the corresponding drive. (required)
25
26 <pro> is the protocol number for the adapter that
27 supports this drive. These numbers are
28 logged by 'paride' when the protocol modules
29 are initialised. (0 if not given)
30
31 <uni> for those adapters that support chained
32 devices, this is the unit selector for the
33 chain of devices on the given port. It should
34 be zero for devices that don't support chaining.
35 (0 if not given)
36
37 <mod> this can be -1 to choose the best mode, or one
38 of the mode numbers supported by the adapter.
39 (-1 if not given)
40
41 <slv> ATAPI CD-ROMs can be jumpered to master or slave.
42 Set this to 0 to choose the master drive, 1 to
43 choose the slave, -1 (the default) to choose the
44 first drive found.
45
46 <dly> some parallel ports require the driver to
47 go more slowly. -1 sets a default value that
48 should work with the chosen protocol. Otherwise,
49 set this to a small integer, the larger it is
50 the slower the port i/o. In some cases, setting
51 this to zero will speed up the device. (default -1)
52
53 major You may use this parameter to overide the
54 default major number (46) that this driver
55 will use. Be sure to change the device
56 name as well.
57
58 name This parameter is a character string that
59 contains the name the kernel will use for this
60 device (in /proc output, for instance).
61 (default "pcd")
62
63 verbose This parameter controls the amount of logging
64 that the driver will do. Set it to 0 for
65 normal operation, 1 to see autoprobe progress
66 messages, or 2 to see additional debugging
67 output. (default 0)
68
69 nice This parameter controls the driver's use of
70 idle CPU time, at the expense of some speed.
71
72 If this driver is built into the kernel, you can use kernel
73 the following command line parameters, with the same values
74 as the corresponding module parameters listed above:
75
76 pcd.drive0
77 pcd.drive1
78 pcd.drive2
79 pcd.drive3
80 pcd.nice
81
82 In addition, you can use the parameter pcd.disable to disable
83 the driver entirely.
84
85*/
86
87/* Changes:
88
89 1.01 GRG 1998.01.24 Added test unit ready support
90 1.02 GRG 1998.05.06 Changes to pcd_completion, ready_wait,
91 and loosen interpretation of ATAPI
92 standard for clearing error status.
93 Use spinlocks. Eliminate sti().
94 1.03 GRG 1998.06.16 Eliminated an Ugh
95 1.04 GRG 1998.08.15 Added extra debugging, improvements to
96 pcd_completion, use HZ in loop timing
97 1.05 GRG 1998.08.16 Conformed to "Uniform CD-ROM" standard
98 1.06 GRG 1998.08.19 Added audio ioctl support
99 1.07 GRG 1998.09.24 Increased reset timeout, added jumbo support
100
101*/
102
103#define PCD_VERSION "1.07"
104#define PCD_MAJOR 46
105#define PCD_NAME "pcd"
106#define PCD_UNITS 4
107
108/* Here are things one can override from the insmod command.
109 Most are autoprobed by paride unless set here. Verbose is off
110 by default.
111
112*/
113
114static int verbose = 0;
115static int major = PCD_MAJOR;
116static char *name = PCD_NAME;
117static int nice = 0;
118static int disable = 0;
119
120static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
121static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
122static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
123static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
124
125static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
126static int pcd_drive_count;
127
128enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
129
130/* end of parameters */
131
132#include <linux/module.h>
133#include <linux/init.h>
134#include <linux/errno.h>
135#include <linux/fs.h>
136#include <linux/kernel.h>
137#include <linux/delay.h>
138#include <linux/cdrom.h>
139#include <linux/spinlock.h>
140#include <linux/blkdev.h>
2a48fc0a 141#include <linux/mutex.h>
1da177e4
LT		 142#include <asm/uaccess.h>
143
2a48fc0a 144static DEFINE_MUTEX(pcd_mutex);
671d40f4 145static DEFINE_SPINLOCK(pcd_lock);
1da177e4 146
1b9fbafb 147module_param(verbose, int, 0644);
1da177e4
LT		 148module_param(major, int, 0);
149module_param(name, charp, 0);
150module_param(nice, int, 0);
151module_param_array(drive0, int, NULL, 0);
152module_param_array(drive1, int, NULL, 0);
153module_param_array(drive2, int, NULL, 0);
154module_param_array(drive3, int, NULL, 0);
155
156#include "paride.h"
157#include "pseudo.h"
158
159#define PCD_RETRIES 5
160#define PCD_TMO 800 /* timeout in jiffies */
161#define PCD_DELAY 50 /* spin delay in uS */
162#define PCD_READY_TMO 20 /* in seconds */
163#define PCD_RESET_TMO 100 /* in tenths of a second */
164
165#define PCD_SPIN (1000000*PCD_TMO)/(HZ*PCD_DELAY)
166
167#define IDE_ERR 0x01
168#define IDE_DRQ 0x08
169#define IDE_READY 0x40
170#define IDE_BUSY 0x80
171
172static int pcd_open(struct cdrom_device_info *cdi, int purpose);
173static void pcd_release(struct cdrom_device_info *cdi);
174static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr);
b1b56b93
TH		 175static unsigned int pcd_check_events(struct cdrom_device_info *cdi,
176 unsigned int clearing, int slot_nr);
1da177e4
LT		 177static int pcd_tray_move(struct cdrom_device_info *cdi, int position);
178static int pcd_lock_door(struct cdrom_device_info *cdi, int lock);
179static int pcd_drive_reset(struct cdrom_device_info *cdi);
180static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn);
181static int pcd_audio_ioctl(struct cdrom_device_info *cdi,
182 unsigned int cmd, void *arg);
183static int pcd_packet(struct cdrom_device_info *cdi,
184 struct packet_command *cgc);
185
186static int pcd_detect(void);
187static void pcd_probe_capabilities(void);
188static void do_pcd_read_drq(void);
165125e1 189static void do_pcd_request(struct request_queue * q);
1da177e4
LT		 190static void do_pcd_read(void);
191
192struct pcd_unit {
193 struct pi_adapter pia; /* interface to paride layer */
194 struct pi_adapter *pi;
195 int drive; /* master/slave */
196 int last_sense; /* result of last request sense */
197 int changed; /* media change seen */
198 int present; /* does this unit exist ? */
199 char *name; /* pcd0, pcd1, etc */
200 struct cdrom_device_info info; /* uniform cdrom interface */
201 struct gendisk *disk;
202};
203
204static struct pcd_unit pcd[PCD_UNITS];
205
206static char pcd_scratch[64];
207static char pcd_buffer[2048]; /* raw block buffer */
208static int pcd_bufblk = -1; /* block in buffer, in CD units,
209 -1 for nothing there. See also
210 pd_unit.
211 */
212
213/* the variables below are used mainly in the I/O request engine, which
214 processes only one request at a time.
215*/
216
217static struct pcd_unit *pcd_current; /* current request's drive */
218static struct request *pcd_req;
219static int pcd_retries; /* retries on current request */
220static int pcd_busy; /* request being processed ? */
221static int pcd_sector; /* address of next requested sector */
222static int pcd_count; /* number of blocks still to do */
223static char *pcd_buf; /* buffer for request in progress */
224
1da177e4
LT		 225/* kernel glue structures */
226
c9acf903 227static int pcd_block_open(struct block_device *bdev, fmode_t mode)
1da177e4 228{
c9acf903 229 struct pcd_unit *cd = bdev->bd_disk->private_data;
6e9624b8
AB		 230 int ret;
231
2a48fc0a 232 mutex_lock(&pcd_mutex);
6e9624b8 233 ret = cdrom_open(&cd->info, bdev, mode);
2a48fc0a 234 mutex_unlock(&pcd_mutex);
6e9624b8
AB		 235
236 return ret;
1da177e4
LT		 237}
238
c9acf903 239static int pcd_block_release(struct gendisk *disk, fmode_t mode)
1da177e4 240{
c9acf903 241 struct pcd_unit *cd = disk->private_data;
2a48fc0a 242 mutex_lock(&pcd_mutex);
c9acf903 243 cdrom_release(&cd->info, mode);
2a48fc0a 244 mutex_unlock(&pcd_mutex);
bbc1cc97 245 return 0;
1da177e4
LT		 246}
247
c9acf903 248static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 249 unsigned cmd, unsigned long arg)
250{
c9acf903 251 struct pcd_unit *cd = bdev->bd_disk->private_data;
8a6cfeb6
AB		 252 int ret;
253
2a48fc0a 254 mutex_lock(&pcd_mutex);
8a6cfeb6 255 ret = cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
2a48fc0a 256 mutex_unlock(&pcd_mutex);
8a6cfeb6
AB		 257
258 return ret;
1da177e4
LT		 259}
260
b1b56b93
TH		 261static unsigned int pcd_block_check_events(struct gendisk *disk,
262 unsigned int clearing)
1da177e4
LT		 263{
264 struct pcd_unit *cd = disk->private_data;
b1b56b93 265 return cdrom_check_events(&cd->info, clearing);
1da177e4
LT		 266}
267
83d5cde4 268static const struct block_device_operations pcd_bdops = {
1da177e4 269 .owner = THIS_MODULE,
c9acf903
AV		 270 .open = pcd_block_open,
271 .release = pcd_block_release,
8a6cfeb6 272 .ioctl = pcd_block_ioctl,
b1b56b93 273 .check_events = pcd_block_check_events,
1da177e4
LT		 274};
275
276static struct cdrom_device_ops pcd_dops = {
277 .open = pcd_open,
278 .release = pcd_release,
279 .drive_status = pcd_drive_status,
b1b56b93 280 .check_events = pcd_check_events,
1da177e4
LT		 281 .tray_move = pcd_tray_move,
282 .lock_door = pcd_lock_door,
283 .get_mcn = pcd_get_mcn,
284 .reset = pcd_drive_reset,
285 .audio_ioctl = pcd_audio_ioctl,
286 .generic_packet = pcd_packet,
287 .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
288 CDC_MCN | CDC_MEDIA_CHANGED | CDC_RESET |
289 CDC_PLAY_AUDIO | CDC_GENERIC_PACKET | CDC_CD_R |
290 CDC_CD_RW,
291};
292
293static void pcd_init_units(void)
294{
295 struct pcd_unit *cd;
296 int unit;
297
298 pcd_drive_count = 0;
299 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
300 struct gendisk *disk = alloc_disk(1);
301 if (!disk)
302 continue;
303 cd->disk = disk;
304 cd->pi = &cd->pia;
305 cd->present = 0;
306 cd->last_sense = 0;
307 cd->changed = 1;
308 cd->drive = (*drives[unit])[D_SLV];
309 if ((*drives[unit])[D_PRT])
310 pcd_drive_count++;
311
312 cd->name = &cd->info.name[0];
313 snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
314 cd->info.ops = &pcd_dops;
315 cd->info.handle = cd;
316 cd->info.speed = 0;
317 cd->info.capacity = 1;
318 cd->info.mask = 0;
319 disk->major = major;
320 disk->first_minor = unit;
321 strcpy(disk->disk_name, cd->name); /* umm... */
322 disk->fops = &pcd_bdops;
d4dc210f 323 disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
1da177e4
LT		 324 }
325}
326
327static int pcd_open(struct cdrom_device_info *cdi, int purpose)
328{
329 struct pcd_unit *cd = cdi->handle;
330 if (!cd->present)
331 return -ENODEV;
332 return 0;
333}
334
335static void pcd_release(struct cdrom_device_info *cdi)
336{
337}
338
339static inline int status_reg(struct pcd_unit *cd)
340{
341 return pi_read_regr(cd->pi, 1, 6);
342}
343
344static inline int read_reg(struct pcd_unit *cd, int reg)
345{
346 return pi_read_regr(cd->pi, 0, reg);
347}
348
349static inline void write_reg(struct pcd_unit *cd, int reg, int val)
350{
351 pi_write_regr(cd->pi, 0, reg, val);
352}
353
354static int pcd_wait(struct pcd_unit *cd, int go, int stop, char *fun, char *msg)
355{
356 int j, r, e, s, p;
357
358 j = 0;
359 while ((((r = status_reg(cd)) & go) || (stop && (!(r & stop))))
360 && (j++ < PCD_SPIN))
361 udelay(PCD_DELAY);
362
c12ec0a2 363 if ((r & (IDE_ERR & stop)) || (j > PCD_SPIN)) {
1da177e4
LT		 364 s = read_reg(cd, 7);
365 e = read_reg(cd, 1);
366 p = read_reg(cd, 2);
c12ec0a2 367 if (j > PCD_SPIN)
1da177e4
LT		 368 e |= 0x100;
369 if (fun)
370 printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
371 " loop=%d phase=%d\n",
372 cd->name, fun, msg, r, s, e, j, p);
373 return (s << 8) + r;
374 }
375 return 0;
376}
377
378static int pcd_command(struct pcd_unit *cd, char *cmd, int dlen, char *fun)
379{
380 pi_connect(cd->pi);
381
382 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
383
384 if (pcd_wait(cd, IDE_BUSY | IDE_DRQ, 0, fun, "before command")) {
385 pi_disconnect(cd->pi);
386 return -1;
387 }
388
389 write_reg(cd, 4, dlen % 256);
390 write_reg(cd, 5, dlen / 256);
391 write_reg(cd, 7, 0xa0); /* ATAPI packet command */
392
393 if (pcd_wait(cd, IDE_BUSY, IDE_DRQ, fun, "command DRQ")) {
394 pi_disconnect(cd->pi);
395 return -1;
396 }
397
398 if (read_reg(cd, 2) != 1) {
399 printk("%s: %s: command phase error\n", cd->name, fun);
400 pi_disconnect(cd->pi);
401 return -1;
402 }
403
404 pi_write_block(cd->pi, cmd, 12);
405
406 return 0;
407}
408
409static int pcd_completion(struct pcd_unit *cd, char *buf, char *fun)
410{
411 int r, d, p, n, k, j;
412
413 r = -1;
414 k = 0;
415 j = 0;
416
417 if (!pcd_wait(cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR,
418 fun, "completion")) {
419 r = 0;
420 while (read_reg(cd, 7) & IDE_DRQ) {
421 d = read_reg(cd, 4) + 256 * read_reg(cd, 5);
422 n = (d + 3) & 0xfffc;
423 p = read_reg(cd, 2) & 3;
424
425 if ((p == 2) && (n > 0) && (j == 0)) {
426 pi_read_block(cd->pi, buf, n);
427 if (verbose > 1)
428 printk("%s: %s: Read %d bytes\n",
429 cd->name, fun, n);
430 r = 0;
431 j++;
432 } else {
433 if (verbose > 1)
434 printk
435 ("%s: %s: Unexpected phase %d, d=%d, k=%d\n",
436 cd->name, fun, p, d, k);
49b3a3cb
MS		 437 if (verbose < 2)
438 printk_once(
439 "%s: WARNING: ATAPI phase errors\n",
440 cd->name);
1da177e4
LT		 441 mdelay(1);
442 }
443 if (k++ > PCD_TMO) {
444 printk("%s: Stuck DRQ\n", cd->name);
445 break;
446 }
447 if (pcd_wait
448 (cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR, fun,
449 "completion")) {
450 r = -1;
451 break;
452 }
453 }
454 }
455
456 pi_disconnect(cd->pi);
457
458 return r;
459}
460
461static void pcd_req_sense(struct pcd_unit *cd, char *fun)
462{
463 char rs_cmd[12] = { 0x03, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
464 char buf[16];
465 int r, c;
466
467 r = pcd_command(cd, rs_cmd, 16, "Request sense");
468 mdelay(1);
469 if (!r)
470 pcd_completion(cd, buf, "Request sense");
471
472 cd->last_sense = -1;
473 c = 2;
474 if (!r) {
475 if (fun)
476 printk("%s: %s: Sense key: %x, ASC: %x, ASQ: %x\n",
477 cd->name, fun, buf[2] & 0xf, buf[12], buf[13]);
478 c = buf[2] & 0xf;
479 cd->last_sense =
480 c | ((buf[12] & 0xff) << 8) | ((buf[13] & 0xff) << 16);
481 }
482 if ((c == 2) || (c == 6))
483 cd->changed = 1;
484}
485
486static int pcd_atapi(struct pcd_unit *cd, char *cmd, int dlen, char *buf, char *fun)
487{
488 int r;
489
490 r = pcd_command(cd, cmd, dlen, fun);
491 mdelay(1);
492 if (!r)
493 r = pcd_completion(cd, buf, fun);
494 if (r)
495 pcd_req_sense(cd, fun);
496
497 return r;
498}
499
500static int pcd_packet(struct cdrom_device_info *cdi, struct packet_command *cgc)
501{
502 return pcd_atapi(cdi->handle, cgc->cmd, cgc->buflen, cgc->buffer,
503 "generic packet");
504}
505
506#define DBMSG(msg) ((verbose>1)?(msg):NULL)
507
b1b56b93
TH		 508static unsigned int pcd_check_events(struct cdrom_device_info *cdi,
509 unsigned int clearing, int slot_nr)
1da177e4
LT		 510{
511 struct pcd_unit *cd = cdi->handle;
512 int res = cd->changed;
513 if (res)
514 cd->changed = 0;
b1b56b93 515 return res ? DISK_EVENT_MEDIA_CHANGE : 0;
1da177e4
LT		 516}
517
518static int pcd_lock_door(struct cdrom_device_info *cdi, int lock)
519{
520 char un_cmd[12] = { 0x1e, 0, 0, 0, lock, 0, 0, 0, 0, 0, 0, 0 };
521
522 return pcd_atapi(cdi->handle, un_cmd, 0, pcd_scratch,
523 lock ? "lock door" : "unlock door");
524}
525
526static int pcd_tray_move(struct cdrom_device_info *cdi, int position)
527{
528 char ej_cmd[12] = { 0x1b, 0, 0, 0, 3 - position, 0, 0, 0, 0, 0, 0, 0 };
529
530 return pcd_atapi(cdi->handle, ej_cmd, 0, pcd_scratch,
531 position ? "eject" : "close tray");
532}
533
534static void pcd_sleep(int cs)
535{
86e84862 536 schedule_timeout_interruptible(cs);
1da177e4
LT		 537}
538
539static int pcd_reset(struct pcd_unit *cd)
540{
541 int i, k, flg;
542 int expect[5] = { 1, 1, 1, 0x14, 0xeb };
543
544 pi_connect(cd->pi);
545 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
546 write_reg(cd, 7, 8);
547
548 pcd_sleep(20 * HZ / 1000); /* delay a bit */
549
550 k = 0;
551 while ((k++ < PCD_RESET_TMO) && (status_reg(cd) & IDE_BUSY))
552 pcd_sleep(HZ / 10);
553
554 flg = 1;
555 for (i = 0; i < 5; i++)
556 flg &= (read_reg(cd, i + 1) == expect[i]);
557
558 if (verbose) {
559 printk("%s: Reset (%d) signature = ", cd->name, k);
560 for (i = 0; i < 5; i++)
561 printk("%3x", read_reg(cd, i + 1));
562 if (!flg)
563 printk(" (incorrect)");
564 printk("\n");
565 }
566
567 pi_disconnect(cd->pi);
568 return flg - 1;
569}
570
571static int pcd_drive_reset(struct cdrom_device_info *cdi)
572{
573 return pcd_reset(cdi->handle);
574}
575
576static int pcd_ready_wait(struct pcd_unit *cd, int tmo)
577{
578 char tr_cmd[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
579 int k, p;
580
581 k = 0;
582 while (k < tmo) {
583 cd->last_sense = 0;
584 pcd_atapi(cd, tr_cmd, 0, NULL, DBMSG("test unit ready"));
585 p = cd->last_sense;
586 if (!p)
587 return 0;
588 if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
589 return p;
590 k++;
591 pcd_sleep(HZ);
592 }
593 return 0x000020; /* timeout */
594}
595
596static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
597{
598 char rc_cmd[12] = { 0x25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
599 struct pcd_unit *cd = cdi->handle;
600
601 if (pcd_ready_wait(cd, PCD_READY_TMO))
602 return CDS_DRIVE_NOT_READY;
603 if (pcd_atapi(cd, rc_cmd, 8, pcd_scratch, DBMSG("check media")))
604 return CDS_NO_DISC;
605 return CDS_DISC_OK;
606}
607
608static int pcd_identify(struct pcd_unit *cd, char *id)
609{
610 int k, s;
611 char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
612
613 pcd_bufblk = -1;
614
615 s = pcd_atapi(cd, id_cmd, 36, pcd_buffer, "identify");
616
617 if (s)
618 return -1;
619 if ((pcd_buffer[0] & 0x1f) != 5) {
620 if (verbose)
621 printk("%s: %s is not a CD-ROM\n",
622 cd->name, cd->drive ? "Slave" : "Master");
623 return -1;
624 }
625 memcpy(id, pcd_buffer + 16, 16);
626 id[16] = 0;
627 k = 16;
628 while ((k >= 0) && (id[k] <= 0x20)) {
629 id[k] = 0;
630 k--;
631 }
632
633 printk("%s: %s: %s\n", cd->name, cd->drive ? "Slave" : "Master", id);
634
635 return 0;
636}
637
638/*
639 * returns 0, with id set if drive is detected
640 * -1, if drive detection failed
641 */
642static int pcd_probe(struct pcd_unit *cd, int ms, char *id)
643{
644 if (ms == -1) {
645 for (cd->drive = 0; cd->drive <= 1; cd->drive++)
646 if (!pcd_reset(cd) && !pcd_identify(cd, id))
647 return 0;
648 } else {
649 cd->drive = ms;
650 if (!pcd_reset(cd) && !pcd_identify(cd, id))
651 return 0;
652 }
653 return -1;
654}
655
656static void pcd_probe_capabilities(void)
657{
658 int unit, r;
659 char buffer[32];
660 char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 };
661 struct pcd_unit *cd;
662
663 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
664 if (!cd->present)
665 continue;
666 r = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
667 if (r)
668 continue;
669 /* we should now have the cap page */
670 if ((buffer[11] & 1) == 0)
671 cd->info.mask |= CDC_CD_R;
672 if ((buffer[11] & 2) == 0)
673 cd->info.mask |= CDC_CD_RW;
674 if ((buffer[12] & 1) == 0)
675 cd->info.mask |= CDC_PLAY_AUDIO;
676 if ((buffer[14] & 1) == 0)
677 cd->info.mask |= CDC_LOCK;
678 if ((buffer[14] & 8) == 0)
679 cd->info.mask |= CDC_OPEN_TRAY;
680 if ((buffer[14] >> 6) == 0)
681 cd->info.mask |= CDC_CLOSE_TRAY;
682 }
683}
684
685static int pcd_detect(void)
686{
687 char id[18];
688 int k, unit;
689 struct pcd_unit *cd;
690
691 printk("%s: %s version %s, major %d, nice %d\n",
692 name, name, PCD_VERSION, major, nice);
693
694 k = 0;
695 if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
696 cd = pcd;
697 if (pi_init(cd->pi, 1, -1, -1, -1, -1, -1, pcd_buffer,
698 PI_PCD, verbose, cd->name)) {
699 if (!pcd_probe(cd, -1, id) && cd->disk) {
700 cd->present = 1;
701 k++;
702 } else
703 pi_release(cd->pi);
704 }
705 } else {
706 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
707 int *conf = *drives[unit];
708 if (!conf[D_PRT])
709 continue;
710 if (!pi_init(cd->pi, 0, conf[D_PRT], conf[D_MOD],
711 conf[D_UNI], conf[D_PRO], conf[D_DLY],
712 pcd_buffer, PI_PCD, verbose, cd->name))
713 continue;
714 if (!pcd_probe(cd, conf[D_SLV], id) && cd->disk) {
715 cd->present = 1;
716 k++;
717 } else
718 pi_release(cd->pi);
719 }
720 }
721 if (k)
722 return 0;
723
724 printk("%s: No CD-ROM drive found\n", name);
725 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
726 put_disk(cd->disk);
727 return -1;
728}
729
730/* I/O request processing */
731static struct request_queue *pcd_queue;
732
165125e1 733static void do_pcd_request(struct request_queue * q)
1da177e4
LT		 734{
735 if (pcd_busy)
736 return;
737 while (1) {
b12d4f82 738 if (!pcd_req) {
9934c8c0 739 pcd_req = blk_fetch_request(q);
b12d4f82
TH		 740 if (!pcd_req)
741 return;
b12d4f82 742 }
1da177e4
LT		 743
744 if (rq_data_dir(pcd_req) == READ) {
745 struct pcd_unit *cd = pcd_req->rq_disk->private_data;
746 if (cd != pcd_current)
747 pcd_bufblk = -1;
748 pcd_current = cd;
83096ebf
TH		 749 pcd_sector = blk_rq_pos(pcd_req);
750 pcd_count = blk_rq_cur_sectors(pcd_req);
1da177e4
LT		 751 pcd_buf = pcd_req->buffer;
752 pcd_busy = 1;
753 ps_set_intr(do_pcd_read, NULL, 0, nice);
754 return;
b12d4f82
TH		 755 } else {
756 __blk_end_request_all(pcd_req, -EIO);
757 pcd_req = NULL;
758 }
1da177e4
LT		 759 }
760}
761
f06d9a2b 762static inline void next_request(int err)
1da177e4
LT		 763{
764 unsigned long saved_flags;
765
766 spin_lock_irqsave(&pcd_lock, saved_flags);
b12d4f82
TH		 767 if (!__blk_end_request_cur(pcd_req, err))
768 pcd_req = NULL;
1da177e4
LT		 769 pcd_busy = 0;
770 do_pcd_request(pcd_queue);
771 spin_unlock_irqrestore(&pcd_lock, saved_flags);
772}
773
774static int pcd_ready(void)
775{
776 return (((status_reg(pcd_current) & (IDE_BUSY | IDE_DRQ)) == IDE_DRQ));
777}
778
779static void pcd_transfer(void)
780{
781
782 while (pcd_count && (pcd_sector / 4 == pcd_bufblk)) {
783 int o = (pcd_sector % 4) * 512;
784 memcpy(pcd_buf, pcd_buffer + o, 512);
785 pcd_count--;
786 pcd_buf += 512;
787 pcd_sector++;
788 }
789}
790
791static void pcd_start(void)
792{
793 int b, i;
794 char rd_cmd[12] = { 0xa8, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 };
795
796 pcd_bufblk = pcd_sector / 4;
797 b = pcd_bufblk;
798 for (i = 0; i < 4; i++) {
799 rd_cmd[5 - i] = b & 0xff;
800 b = b >> 8;
801 }
802
803 if (pcd_command(pcd_current, rd_cmd, 2048, "read block")) {
804 pcd_bufblk = -1;
f06d9a2b 805 next_request(-EIO);
1da177e4
LT		 806 return;
807 }
808
809 mdelay(1);
810
811 ps_set_intr(do_pcd_read_drq, pcd_ready, PCD_TMO, nice);
812}
813
814static void do_pcd_read(void)
815{
816 pcd_busy = 1;
817 pcd_retries = 0;
818 pcd_transfer();
819 if (!pcd_count) {
f06d9a2b 820 next_request(0);
1da177e4
LT		 821 return;
822 }
823
824 pi_do_claimed(pcd_current->pi, pcd_start);
825}
826
827static void do_pcd_read_drq(void)
828{
829 unsigned long saved_flags;
830
831 if (pcd_completion(pcd_current, pcd_buffer, "read block")) {
832 if (pcd_retries < PCD_RETRIES) {
833 mdelay(1);
834 pcd_retries++;
835 pi_do_claimed(pcd_current->pi, pcd_start);
836 return;
837 }
838 pcd_bufblk = -1;
f06d9a2b 839 next_request(-EIO);
1da177e4
LT		 840 return;
841 }
842
843 do_pcd_read();
844 spin_lock_irqsave(&pcd_lock, saved_flags);
845 do_pcd_request(pcd_queue);
846 spin_unlock_irqrestore(&pcd_lock, saved_flags);
847}
848
849/* the audio_ioctl stuff is adapted from sr_ioctl.c */
850
851static int pcd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
852{
853 struct pcd_unit *cd = cdi->handle;
854
855 switch (cmd) {
856
857 case CDROMREADTOCHDR:
858
859 {
860 char cmd[12] =
861 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
862 0, 0, 0 };
863 struct cdrom_tochdr *tochdr =
864 (struct cdrom_tochdr *) arg;
865 char buffer[32];
866 int r;
867
868 r = pcd_atapi(cd, cmd, 12, buffer, "read toc header");
869
870 tochdr->cdth_trk0 = buffer[2];
871 tochdr->cdth_trk1 = buffer[3];
872
873 return r ? -EIO : 0;
874 }
875
876 case CDROMREADTOCENTRY:
877
878 {
879 char cmd[12] =
880 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
881 0, 0, 0 };
882
883 struct cdrom_tocentry *tocentry =
884 (struct cdrom_tocentry *) arg;
885 unsigned char buffer[32];
886 int r;
887
888 cmd[1] =
889 (tocentry->cdte_format == CDROM_MSF ? 0x02 : 0);
890 cmd[6] = tocentry->cdte_track;
891
892 r = pcd_atapi(cd, cmd, 12, buffer, "read toc entry");
893
894 tocentry->cdte_ctrl = buffer[5] & 0xf;
895 tocentry->cdte_adr = buffer[5] >> 4;
896 tocentry->cdte_datamode =
897 (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
898 if (tocentry->cdte_format == CDROM_MSF) {
899 tocentry->cdte_addr.msf.minute = buffer[9];
900 tocentry->cdte_addr.msf.second = buffer[10];
901 tocentry->cdte_addr.msf.frame = buffer[11];
902 } else
903 tocentry->cdte_addr.lba =
904 (((((buffer[8] << 8) + buffer[9]) << 8)
905 + buffer[10]) << 8) + buffer[11];
906
907 return r ? -EIO : 0;
908 }
909
910 default:
911
912 return -ENOSYS;
913 }
914}
915
916static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
917{
918 char cmd[12] =
919 { GPCMD_READ_SUBCHANNEL, 0, 0x40, 2, 0, 0, 0, 0, 24, 0, 0, 0 };
920 char buffer[32];
921
922 if (pcd_atapi(cdi->handle, cmd, 24, buffer, "get mcn"))
923 return -EIO;
924
925 memcpy(mcn->medium_catalog_number, buffer + 9, 13);
926 mcn->medium_catalog_number[13] = 0;
927
928 return 0;
929}
930
931static int __init pcd_init(void)
932{
933 struct pcd_unit *cd;
934 int unit;
935
936 if (disable)
8bca98ca 937 return -EINVAL;
1da177e4
LT		 938
939 pcd_init_units();
940
941 if (pcd_detect())
8bca98ca 942 return -ENODEV;
1da177e4
LT		 943
944 /* get the atapi capabilities page */
945 pcd_probe_capabilities();
946
947 if (register_blkdev(major, name)) {
948 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
949 put_disk(cd->disk);
8bca98ca 950 return -EBUSY;
1da177e4
LT		 951 }
952
953 pcd_queue = blk_init_queue(do_pcd_request, &pcd_lock);
954 if (!pcd_queue) {
955 unregister_blkdev(major, name);
956 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
957 put_disk(cd->disk);
8bca98ca 958 return -ENOMEM;
1da177e4
LT		 959 }
960
961 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
962 if (cd->present) {
963 register_cdrom(&cd->info);
964 cd->disk->private_data = cd;
965 cd->disk->queue = pcd_queue;
966 add_disk(cd->disk);
967 }
968 }
969
970 return 0;
971}
972
973static void __exit pcd_exit(void)
974{
975 struct pcd_unit *cd;
976 int unit;
977
978 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
979 if (cd->present) {
980 del_gendisk(cd->disk);
981 pi_release(cd->pi);
982 unregister_cdrom(&cd->info);
983 }
984 put_disk(cd->disk);
985 }
986 blk_cleanup_queue(pcd_queue);
987 unregister_blkdev(major, name);
988}
989
990MODULE_LICENSE("GPL");
991module_init(pcd_init)
992module_exit(pcd_exit)
Linux 6.x block layer and io_uring tree(s)