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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 pt.c (c) 1998 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 This is the high-level driver for parallel port ATAPI tape
6 drives based on chips supported by the paride module.
7
8 The driver implements both rewinding and non-rewinding
9 devices, filemarks, and the rewind ioctl. It allocates
10 a small internal "bounce buffer" for each open device, but
11 otherwise expects buffering and blocking to be done at the
12 user level. As with most block-structured tapes, short
13 writes are padded to full tape blocks, so reading back a file
14 may return more data than was actually written.
15
16 By default, the driver will autoprobe for a single parallel
17 port ATAPI tape drive, but if their individual parameters are
18 specified, the driver can handle up to 4 drives.
19
20 The rewinding devices are named /dev/pt0, /dev/pt1, ...
21 while the non-rewinding devices are /dev/npt0, /dev/npt1, etc.
22
23 The behaviour of the pt driver can be altered by setting
24 some parameters from the insmod command line. The following
25 parameters are adjustable:
26
27 drive0 These four arguments can be arrays of
28 drive1 1-6 integers as follows:
29 drive2
30 drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
31
32 Where,
33
34 <prt> is the base of the parallel port address for
35 the corresponding drive. (required)
36
37 <pro> is the protocol number for the adapter that
38 supports this drive. These numbers are
39 logged by 'paride' when the protocol modules
40 are initialised. (0 if not given)
41
42 <uni> for those adapters that support chained
43 devices, this is the unit selector for the
44 chain of devices on the given port. It should
45 be zero for devices that don't support chaining.
46 (0 if not given)
47
48 <mod> this can be -1 to choose the best mode, or one
49 of the mode numbers supported by the adapter.
50 (-1 if not given)
51
52 <slv> ATAPI devices can be jumpered to master or slave.
53 Set this to 0 to choose the master drive, 1 to
54 choose the slave, -1 (the default) to choose the
55 first drive found.
56
57 <dly> some parallel ports require the driver to
58 go more slowly. -1 sets a default value that
59 should work with the chosen protocol. Otherwise,
60 set this to a small integer, the larger it is
61 the slower the port i/o. In some cases, setting
62 this to zero will speed up the device. (default -1)
63
64 major You may use this parameter to overide the
65 default major number (96) that this driver
66 will use. Be sure to change the device
67 name as well.
68
69 name This parameter is a character string that
70 contains the name the kernel will use for this
71 device (in /proc output, for instance).
72 (default "pt").
73
74 verbose This parameter controls the amount of logging
75 that the driver will do. Set it to 0 for
76 normal operation, 1 to see autoprobe progress
77 messages, or 2 to see additional debugging
78 output. (default 0)
79
80 If this driver is built into the kernel, you can use
81 the following command line parameters, with the same values
82 as the corresponding module parameters listed above:
83
84 pt.drive0
85 pt.drive1
86 pt.drive2
87 pt.drive3
88
89 In addition, you can use the parameter pt.disable to disable
90 the driver entirely.
91
92*/
93
94/* Changes:
95
96 1.01 GRG 1998.05.06 Round up transfer size, fix ready_wait,
97 loosed interpretation of ATAPI standard
98 for clearing error status.
99 Eliminate sti();
100 1.02 GRG 1998.06.16 Eliminate an Ugh.
101 1.03 GRG 1998.08.15 Adjusted PT_TMO, use HZ in loop timing,
102 extra debugging
103 1.04 GRG 1998.09.24 Repair minor coding error, added jumbo support
104
105*/
106
107#define PT_VERSION "1.04"
108#define PT_MAJOR 96
109#define PT_NAME "pt"
110#define PT_UNITS 4
111
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030112#include <linux/types.h>
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114/* Here are things one can override from the insmod command.
115 Most are autoprobed by paride unless set here. Verbose is on
116 by default.
117
118*/
119
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030120static bool verbose = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121static int major = PT_MAJOR;
122static char *name = PT_NAME;
123static int disable = 0;
124
125static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
126static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
127static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
128static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
129
130static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
131
132#define D_PRT 0
133#define D_PRO 1
134#define D_UNI 2
135#define D_MOD 3
136#define D_SLV 4
137#define D_DLY 5
138
139#define DU (*drives[unit])
140
141/* end of parameters */
142
143#include <linux/module.h>
144#include <linux/init.h>
145#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#include <linux/delay.h>
147#include <linux/slab.h>
148#include <linux/mtio.h>
149#include <linux/device.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -0800150#include <linux/sched.h> /* current, TASK_*, schedule_timeout() */
Arnd Bergmann613655f2010-06-02 14:28:52 +0200151#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153#include <asm/uaccess.h>
154
155module_param(verbose, bool, 0);
156module_param(major, int, 0);
157module_param(name, charp, 0);
158module_param_array(drive0, int, NULL, 0);
159module_param_array(drive1, int, NULL, 0);
160module_param_array(drive2, int, NULL, 0);
161module_param_array(drive3, int, NULL, 0);
162
163#include "paride.h"
164
165#define PT_MAX_RETRIES 5
166#define PT_TMO 3000 /* interrupt timeout in jiffies */
167#define PT_SPIN_DEL 50 /* spin delay in micro-seconds */
168#define PT_RESET_TMO 30 /* 30 seconds */
169#define PT_READY_TMO 60 /* 60 seconds */
170#define PT_REWIND_TMO 1200 /* 20 minutes */
171
172#define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO)
173
174#define STAT_ERR 0x00001
175#define STAT_INDEX 0x00002
176#define STAT_ECC 0x00004
177#define STAT_DRQ 0x00008
178#define STAT_SEEK 0x00010
179#define STAT_WRERR 0x00020
180#define STAT_READY 0x00040
181#define STAT_BUSY 0x00080
182#define STAT_SENSE 0x1f000
183
184#define ATAPI_TEST_READY 0x00
185#define ATAPI_REWIND 0x01
186#define ATAPI_REQ_SENSE 0x03
187#define ATAPI_READ_6 0x08
188#define ATAPI_WRITE_6 0x0a
189#define ATAPI_WFM 0x10
190#define ATAPI_IDENTIFY 0x12
191#define ATAPI_MODE_SENSE 0x1a
192#define ATAPI_LOG_SENSE 0x4d
193
Arnd Bergmann613655f2010-06-02 14:28:52 +0200194static DEFINE_MUTEX(pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195static int pt_open(struct inode *inode, struct file *file);
Alan Coxbe1fd702008-07-04 09:51:21 +0200196static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197static int pt_release(struct inode *inode, struct file *file);
198static ssize_t pt_read(struct file *filp, char __user *buf,
199 size_t count, loff_t * ppos);
200static ssize_t pt_write(struct file *filp, const char __user *buf,
201 size_t count, loff_t * ppos);
202static int pt_detect(void);
203
204/* bits in tape->flags */
205
206#define PT_MEDIA 1
207#define PT_WRITE_OK 2
208#define PT_REWIND 4
209#define PT_WRITING 8
210#define PT_READING 16
211#define PT_EOF 32
212
213#define PT_NAMELEN 8
214#define PT_BUFSIZE 16384
215
216struct pt_unit {
217 struct pi_adapter pia; /* interface to paride layer */
218 struct pi_adapter *pi;
219 int flags; /* various state flags */
220 int last_sense; /* result of last request sense */
221 int drive; /* drive */
222 atomic_t available; /* 1 if access is available 0 otherwise */
223 int bs; /* block size */
224 int capacity; /* Size of tape in KB */
225 int present; /* device present ? */
226 char *bufptr;
227 char name[PT_NAMELEN]; /* pf0, pf1, ... */
228};
229
230static int pt_identify(struct pt_unit *tape);
231
232static struct pt_unit pt[PT_UNITS];
233
234static char pt_scratch[512]; /* scratch block buffer */
235
236/* kernel glue structures */
237
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800238static const struct file_operations pt_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 .owner = THIS_MODULE,
240 .read = pt_read,
241 .write = pt_write,
Alan Coxbe1fd702008-07-04 09:51:21 +0200242 .unlocked_ioctl = pt_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 .open = pt_open,
244 .release = pt_release,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200245 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246};
247
248/* sysfs class support */
gregkh@suse.dedeb36972005-03-23 09:52:10 -0800249static struct class *pt_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251static inline int status_reg(struct pi_adapter *pi)
252{
253 return pi_read_regr(pi, 1, 6);
254}
255
256static inline int read_reg(struct pi_adapter *pi, int reg)
257{
258 return pi_read_regr(pi, 0, reg);
259}
260
261static inline void write_reg(struct pi_adapter *pi, int reg, int val)
262{
263 pi_write_regr(pi, 0, reg, val);
264}
265
266static inline u8 DRIVE(struct pt_unit *tape)
267{
268 return 0xa0+0x10*tape->drive;
269}
270
271static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg)
272{
273 int j, r, e, s, p;
274 struct pi_adapter *pi = tape->pi;
275
276 j = 0;
277 while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop))))
278 && (j++ < PT_SPIN))
279 udelay(PT_SPIN_DEL);
280
Roel Kluinc12ec0a2010-03-11 14:09:47 -0800281 if ((r & (STAT_ERR & stop)) || (j > PT_SPIN)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 s = read_reg(pi, 7);
283 e = read_reg(pi, 1);
284 p = read_reg(pi, 2);
Roel Kluinc12ec0a2010-03-11 14:09:47 -0800285 if (j > PT_SPIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 e |= 0x100;
287 if (fun)
288 printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
289 " loop=%d phase=%d\n",
290 tape->name, fun, msg, r, s, e, j, p);
291 return (e << 8) + s;
292 }
293 return 0;
294}
295
296static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun)
297{
298 struct pi_adapter *pi = tape->pi;
299 pi_connect(pi);
300
301 write_reg(pi, 6, DRIVE(tape));
302
303 if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
304 pi_disconnect(pi);
305 return -1;
306 }
307
308 write_reg(pi, 4, dlen % 256);
309 write_reg(pi, 5, dlen / 256);
310 write_reg(pi, 7, 0xa0); /* ATAPI packet command */
311
312 if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
313 pi_disconnect(pi);
314 return -1;
315 }
316
317 if (read_reg(pi, 2) != 1) {
318 printk("%s: %s: command phase error\n", tape->name, fun);
319 pi_disconnect(pi);
320 return -1;
321 }
322
323 pi_write_block(pi, cmd, 12);
324
325 return 0;
326}
327
328static int pt_completion(struct pt_unit *tape, char *buf, char *fun)
329{
330 struct pi_adapter *pi = tape->pi;
331 int r, s, n, p;
332
333 r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
334 fun, "completion");
335
336 if (read_reg(pi, 7) & STAT_DRQ) {
337 n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) +
338 3) & 0xfffc);
339 p = read_reg(pi, 2) & 3;
340 if (p == 0)
341 pi_write_block(pi, buf, n);
342 if (p == 2)
343 pi_read_block(pi, buf, n);
344 }
345
346 s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
347
348 pi_disconnect(pi);
349
350 return (r ? r : s);
351}
352
353static void pt_req_sense(struct pt_unit *tape, int quiet)
354{
355 char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
356 char buf[16];
357 int r;
358
359 r = pt_command(tape, rs_cmd, 16, "Request sense");
360 mdelay(1);
361 if (!r)
362 pt_completion(tape, buf, "Request sense");
363
364 tape->last_sense = -1;
365 if (!r) {
366 if (!quiet)
367 printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n",
368 tape->name, buf[2] & 0xf, buf[12], buf[13]);
369 tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8)
370 | ((buf[13] & 0xff) << 16);
371 }
372}
373
374static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun)
375{
376 int r;
377
378 r = pt_command(tape, cmd, dlen, fun);
379 mdelay(1);
380 if (!r)
381 r = pt_completion(tape, buf, fun);
382 if (r)
383 pt_req_sense(tape, !fun);
384
385 return r;
386}
387
388static void pt_sleep(int cs)
389{
Nishanth Aravamudan86e84862005-09-10 00:27:28 -0700390 schedule_timeout_interruptible(cs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
393static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg)
394{
395 struct pi_adapter *pi = tape->pi;
396 int k, e, s;
397
398 k = 0;
399 e = 0;
400 s = 0;
401 while (k < tmo) {
402 pt_sleep(pause);
403 k++;
404 pi_connect(pi);
405 write_reg(pi, 6, DRIVE(tape));
406 s = read_reg(pi, 7);
407 e = read_reg(pi, 1);
408 pi_disconnect(pi);
409 if (s & (STAT_ERR | STAT_SEEK))
410 break;
411 }
412 if ((k >= tmo) || (s & STAT_ERR)) {
413 if (k >= tmo)
414 printk("%s: %s DSC timeout\n", tape->name, msg);
415 else
416 printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s,
417 e);
418 pt_req_sense(tape, 0);
419 return 0;
420 }
421 return 1;
422}
423
424static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun)
425{
426 if (pt_command(tape, cmd, 0, fun)) {
427 pt_req_sense(tape, 0);
428 return;
429 }
430 pi_disconnect(tape->pi);
431 pt_poll_dsc(tape, HZ, tmo, fun);
432}
433
434static void pt_rewind(struct pt_unit *tape)
435{
436 char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
437
438 pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind");
439}
440
441static void pt_write_fm(struct pt_unit *tape)
442{
443 char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 };
444
445 pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark");
446}
447
448#define DBMSG(msg) ((verbose>1)?(msg):NULL)
449
450static int pt_reset(struct pt_unit *tape)
451{
452 struct pi_adapter *pi = tape->pi;
453 int i, k, flg;
454 int expect[5] = { 1, 1, 1, 0x14, 0xeb };
455
456 pi_connect(pi);
457 write_reg(pi, 6, DRIVE(tape));
458 write_reg(pi, 7, 8);
459
460 pt_sleep(20 * HZ / 1000);
461
462 k = 0;
463 while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY))
464 pt_sleep(HZ / 10);
465
466 flg = 1;
467 for (i = 0; i < 5; i++)
468 flg &= (read_reg(pi, i + 1) == expect[i]);
469
470 if (verbose) {
471 printk("%s: Reset (%d) signature = ", tape->name, k);
472 for (i = 0; i < 5; i++)
473 printk("%3x", read_reg(pi, i + 1));
474 if (!flg)
475 printk(" (incorrect)");
476 printk("\n");
477 }
478
479 pi_disconnect(pi);
480 return flg - 1;
481}
482
483static int pt_ready_wait(struct pt_unit *tape, int tmo)
484{
485 char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
486 int k, p;
487
488 k = 0;
489 while (k < tmo) {
490 tape->last_sense = 0;
491 pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready"));
492 p = tape->last_sense;
493 if (!p)
494 return 0;
495 if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
496 return p;
497 k++;
498 pt_sleep(HZ);
499 }
500 return 0x000020; /* timeout */
501}
502
503static void xs(char *buf, char *targ, int offs, int len)
504{
505 int j, k, l;
506
507 j = 0;
508 l = 0;
509 for (k = 0; k < len; k++)
510 if ((buf[k + offs] != 0x20) || (buf[k + offs] != l))
511 l = targ[j++] = buf[k + offs];
512 if (l == 0x20)
513 j--;
514 targ[j] = 0;
515}
516
517static int xn(char *buf, int offs, int size)
518{
519 int v, k;
520
521 v = 0;
522 for (k = 0; k < size; k++)
523 v = v * 256 + (buf[k + offs] & 0xff);
524 return v;
525}
526
527static int pt_identify(struct pt_unit *tape)
528{
529 int dt, s;
530 char *ms[2] = { "master", "slave" };
531 char mf[10], id[18];
532 char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
533 char ms_cmd[12] =
534 { ATAPI_MODE_SENSE, 0, 0x2a, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
535 char ls_cmd[12] =
536 { ATAPI_LOG_SENSE, 0, 0x71, 0, 0, 0, 0, 0, 36, 0, 0, 0 };
537 char buf[36];
538
539 s = pt_atapi(tape, id_cmd, 36, buf, "identify");
540 if (s)
541 return -1;
542
543 dt = buf[0] & 0x1f;
544 if (dt != 1) {
545 if (verbose)
546 printk("%s: Drive %d, unsupported type %d\n",
547 tape->name, tape->drive, dt);
548 return -1;
549 }
550
551 xs(buf, mf, 8, 8);
552 xs(buf, id, 16, 16);
553
554 tape->flags = 0;
555 tape->capacity = 0;
556 tape->bs = 0;
557
558 if (!pt_ready_wait(tape, PT_READY_TMO))
559 tape->flags |= PT_MEDIA;
560
561 if (!pt_atapi(tape, ms_cmd, 36, buf, "mode sense")) {
562 if (!(buf[2] & 0x80))
563 tape->flags |= PT_WRITE_OK;
564 tape->bs = xn(buf, 10, 2);
565 }
566
567 if (!pt_atapi(tape, ls_cmd, 36, buf, "log sense"))
568 tape->capacity = xn(buf, 24, 4);
569
570 printk("%s: %s %s, %s", tape->name, mf, id, ms[tape->drive]);
571 if (!(tape->flags & PT_MEDIA))
572 printk(", no media\n");
573 else {
574 if (!(tape->flags & PT_WRITE_OK))
575 printk(", RO");
576 printk(", blocksize %d, %d MB\n", tape->bs, tape->capacity / 1024);
577 }
578
579 return 0;
580}
581
582
583/*
584 * returns 0, with id set if drive is detected
585 * -1, if drive detection failed
586 */
587static int pt_probe(struct pt_unit *tape)
588{
589 if (tape->drive == -1) {
590 for (tape->drive = 0; tape->drive <= 1; tape->drive++)
591 if (!pt_reset(tape))
592 return pt_identify(tape);
593 } else {
594 if (!pt_reset(tape))
595 return pt_identify(tape);
596 }
597 return -1;
598}
599
600static int pt_detect(void)
601{
602 struct pt_unit *tape;
603 int specified = 0, found = 0;
604 int unit;
605
606 printk("%s: %s version %s, major %d\n", name, name, PT_VERSION, major);
607
608 specified = 0;
609 for (unit = 0; unit < PT_UNITS; unit++) {
610 struct pt_unit *tape = &pt[unit];
611 tape->pi = &tape->pia;
612 atomic_set(&tape->available, 1);
613 tape->flags = 0;
614 tape->last_sense = 0;
615 tape->present = 0;
616 tape->bufptr = NULL;
617 tape->drive = DU[D_SLV];
618 snprintf(tape->name, PT_NAMELEN, "%s%d", name, unit);
619 if (!DU[D_PRT])
620 continue;
621 specified++;
622 if (pi_init(tape->pi, 0, DU[D_PRT], DU[D_MOD], DU[D_UNI],
623 DU[D_PRO], DU[D_DLY], pt_scratch, PI_PT,
624 verbose, tape->name)) {
625 if (!pt_probe(tape)) {
626 tape->present = 1;
627 found++;
628 } else
629 pi_release(tape->pi);
630 }
631 }
632 if (specified == 0) {
633 tape = pt;
634 if (pi_init(tape->pi, 1, -1, -1, -1, -1, -1, pt_scratch,
635 PI_PT, verbose, tape->name)) {
636 if (!pt_probe(tape)) {
637 tape->present = 1;
638 found++;
639 } else
640 pi_release(tape->pi);
641 }
642
643 }
644 if (found)
645 return 0;
646
647 printk("%s: No ATAPI tape drive detected\n", name);
648 return -1;
649}
650
651static int pt_open(struct inode *inode, struct file *file)
652{
653 int unit = iminor(inode) & 0x7F;
654 struct pt_unit *tape = pt + unit;
655 int err;
656
Arnd Bergmann613655f2010-06-02 14:28:52 +0200657 mutex_lock(&pt_mutex);
Jonathan Corbetea2959a2008-05-15 10:07:56 -0600658 if (unit >= PT_UNITS || (!tape->present)) {
Arnd Bergmann613655f2010-06-02 14:28:52 +0200659 mutex_unlock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 return -ENODEV;
Jonathan Corbetea2959a2008-05-15 10:07:56 -0600661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 err = -EBUSY;
664 if (!atomic_dec_and_test(&tape->available))
665 goto out;
666
667 pt_identify(tape);
668
669 err = -ENODEV;
Alexey Dobriyaneaa0ff12008-02-06 01:36:06 -0800670 if (!(tape->flags & PT_MEDIA))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 goto out;
672
673 err = -EROFS;
Al Viroaeb5d722008-09-02 15:28:45 -0400674 if ((!(tape->flags & PT_WRITE_OK)) && (file->f_mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 goto out;
676
677 if (!(iminor(inode) & 128))
678 tape->flags |= PT_REWIND;
679
680 err = -ENOMEM;
681 tape->bufptr = kmalloc(PT_BUFSIZE, GFP_KERNEL);
682 if (tape->bufptr == NULL) {
683 printk("%s: buffer allocation failed\n", tape->name);
684 goto out;
685 }
686
687 file->private_data = tape;
Arnd Bergmann613655f2010-06-02 14:28:52 +0200688 mutex_unlock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 return 0;
690
691out:
692 atomic_inc(&tape->available);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200693 mutex_unlock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 return err;
695}
696
Alan Coxbe1fd702008-07-04 09:51:21 +0200697static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698{
699 struct pt_unit *tape = file->private_data;
700 struct mtop __user *p = (void __user *)arg;
701 struct mtop mtop;
702
703 switch (cmd) {
704 case MTIOCTOP:
705 if (copy_from_user(&mtop, p, sizeof(struct mtop)))
706 return -EFAULT;
707
708 switch (mtop.mt_op) {
709
710 case MTREW:
Arnd Bergmann613655f2010-06-02 14:28:52 +0200711 mutex_lock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 pt_rewind(tape);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200713 mutex_unlock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 return 0;
715
716 case MTWEOF:
Arnd Bergmann613655f2010-06-02 14:28:52 +0200717 mutex_lock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 pt_write_fm(tape);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200719 mutex_unlock(&pt_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 return 0;
721
722 default:
Alan Coxbe1fd702008-07-04 09:51:21 +0200723 /* FIXME: rate limit ?? */
724 printk(KERN_DEBUG "%s: Unimplemented mt_op %d\n", tape->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 mtop.mt_op);
726 return -EINVAL;
727 }
728
729 default:
Alan Coxbe1fd702008-07-04 09:51:21 +0200730 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 }
732}
733
734static int
735pt_release(struct inode *inode, struct file *file)
736{
737 struct pt_unit *tape = file->private_data;
738
739 if (atomic_read(&tape->available) > 1)
740 return -EINVAL;
741
742 if (tape->flags & PT_WRITING)
743 pt_write_fm(tape);
744
745 if (tape->flags & PT_REWIND)
746 pt_rewind(tape);
747
748 kfree(tape->bufptr);
749 tape->bufptr = NULL;
750
751 atomic_inc(&tape->available);
752
753 return 0;
754
755}
756
757static ssize_t pt_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
758{
759 struct pt_unit *tape = filp->private_data;
760 struct pi_adapter *pi = tape->pi;
761 char rd_cmd[12] = { ATAPI_READ_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
762 int k, n, r, p, s, t, b;
763
764 if (!(tape->flags & (PT_READING | PT_WRITING))) {
765 tape->flags |= PT_READING;
766 if (pt_atapi(tape, rd_cmd, 0, NULL, "start read-ahead"))
767 return -EIO;
768 } else if (tape->flags & PT_WRITING)
769 return -EIO;
770
771 if (tape->flags & PT_EOF)
772 return 0;
773
774 t = 0;
775
776 while (count > 0) {
777
778 if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "read"))
779 return -EIO;
780
781 n = count;
782 if (n > 32768)
783 n = 32768; /* max per command */
784 b = (n - 1 + tape->bs) / tape->bs;
785 n = b * tape->bs; /* rounded up to even block */
786
787 rd_cmd[4] = b;
788
789 r = pt_command(tape, rd_cmd, n, "read");
790
791 mdelay(1);
792
793 if (r) {
794 pt_req_sense(tape, 0);
795 return -EIO;
796 }
797
798 while (1) {
799
800 r = pt_wait(tape, STAT_BUSY,
801 STAT_DRQ | STAT_ERR | STAT_READY,
802 DBMSG("read DRQ"), "");
803
804 if (r & STAT_SENSE) {
805 pi_disconnect(pi);
806 pt_req_sense(tape, 0);
807 return -EIO;
808 }
809
810 if (r)
811 tape->flags |= PT_EOF;
812
813 s = read_reg(pi, 7);
814
815 if (!(s & STAT_DRQ))
816 break;
817
818 n = (read_reg(pi, 4) + 256 * read_reg(pi, 5));
819 p = (read_reg(pi, 2) & 3);
820 if (p != 2) {
821 pi_disconnect(pi);
822 printk("%s: Phase error on read: %d\n", tape->name,
823 p);
824 return -EIO;
825 }
826
827 while (n > 0) {
828 k = n;
829 if (k > PT_BUFSIZE)
830 k = PT_BUFSIZE;
831 pi_read_block(pi, tape->bufptr, k);
832 n -= k;
833 b = k;
834 if (b > count)
835 b = count;
836 if (copy_to_user(buf + t, tape->bufptr, b)) {
837 pi_disconnect(pi);
838 return -EFAULT;
839 }
840 t += b;
841 count -= b;
842 }
843
844 }
845 pi_disconnect(pi);
846 if (tape->flags & PT_EOF)
847 break;
848 }
849
850 return t;
851
852}
853
854static ssize_t pt_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
855{
856 struct pt_unit *tape = filp->private_data;
857 struct pi_adapter *pi = tape->pi;
858 char wr_cmd[12] = { ATAPI_WRITE_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
859 int k, n, r, p, s, t, b;
860
861 if (!(tape->flags & PT_WRITE_OK))
862 return -EROFS;
863
864 if (!(tape->flags & (PT_READING | PT_WRITING))) {
865 tape->flags |= PT_WRITING;
866 if (pt_atapi
867 (tape, wr_cmd, 0, NULL, "start buffer-available mode"))
868 return -EIO;
869 } else if (tape->flags & PT_READING)
870 return -EIO;
871
872 if (tape->flags & PT_EOF)
873 return -ENOSPC;
874
875 t = 0;
876
877 while (count > 0) {
878
879 if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "write"))
880 return -EIO;
881
882 n = count;
883 if (n > 32768)
884 n = 32768; /* max per command */
885 b = (n - 1 + tape->bs) / tape->bs;
886 n = b * tape->bs; /* rounded up to even block */
887
888 wr_cmd[4] = b;
889
890 r = pt_command(tape, wr_cmd, n, "write");
891
892 mdelay(1);
893
894 if (r) { /* error delivering command only */
895 pt_req_sense(tape, 0);
896 return -EIO;
897 }
898
899 while (1) {
900
901 r = pt_wait(tape, STAT_BUSY,
902 STAT_DRQ | STAT_ERR | STAT_READY,
903 DBMSG("write DRQ"), NULL);
904
905 if (r & STAT_SENSE) {
906 pi_disconnect(pi);
907 pt_req_sense(tape, 0);
908 return -EIO;
909 }
910
911 if (r)
912 tape->flags |= PT_EOF;
913
914 s = read_reg(pi, 7);
915
916 if (!(s & STAT_DRQ))
917 break;
918
919 n = (read_reg(pi, 4) + 256 * read_reg(pi, 5));
920 p = (read_reg(pi, 2) & 3);
921 if (p != 0) {
922 pi_disconnect(pi);
923 printk("%s: Phase error on write: %d \n",
924 tape->name, p);
925 return -EIO;
926 }
927
928 while (n > 0) {
929 k = n;
930 if (k > PT_BUFSIZE)
931 k = PT_BUFSIZE;
932 b = k;
933 if (b > count)
934 b = count;
935 if (copy_from_user(tape->bufptr, buf + t, b)) {
936 pi_disconnect(pi);
937 return -EFAULT;
938 }
939 pi_write_block(pi, tape->bufptr, k);
940 t += b;
941 count -= b;
942 n -= k;
943 }
944
945 }
946 pi_disconnect(pi);
947 if (tape->flags & PT_EOF)
948 break;
949 }
950
951 return t;
952}
953
954static int __init pt_init(void)
955{
Andrew Morton829d5f62006-03-28 01:56:18 -0800956 int unit;
957 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 if (disable) {
Akinobu Mita8bca98c2006-12-06 20:36:43 -0800960 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 goto out;
962 }
963
964 if (pt_detect()) {
Akinobu Mita8bca98c2006-12-06 20:36:43 -0800965 err = -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 goto out;
967 }
968
Andrew Morton829d5f62006-03-28 01:56:18 -0800969 err = register_chrdev(major, name, &pt_fops);
970 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 printk("pt_init: unable to get major number %d\n", major);
972 for (unit = 0; unit < PT_UNITS; unit++)
973 if (pt[unit].present)
974 pi_release(pt[unit].pi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 goto out;
976 }
Andrew Morton829d5f62006-03-28 01:56:18 -0800977 major = err;
gregkh@suse.dedeb36972005-03-23 09:52:10 -0800978 pt_class = class_create(THIS_MODULE, "pt");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (IS_ERR(pt_class)) {
980 err = PTR_ERR(pt_class);
981 goto out_chrdev;
982 }
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 for (unit = 0; unit < PT_UNITS; unit++)
985 if (pt[unit].present) {
Greg Kroah-Hartman1ff9f542008-07-21 20:03:34 -0700986 device_create(pt_class, NULL, MKDEV(major, unit), NULL,
987 "pt%d", unit);
988 device_create(pt_class, NULL, MKDEV(major, unit + 128),
989 NULL, "pt%dn", unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 }
991 goto out;
992
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993out_chrdev:
994 unregister_chrdev(major, "pt");
995out:
996 return err;
997}
998
999static void __exit pt_exit(void)
1000{
1001 int unit;
1002 for (unit = 0; unit < PT_UNITS; unit++)
1003 if (pt[unit].present) {
Tony Jonesaa275822007-09-25 02:03:03 +02001004 device_destroy(pt_class, MKDEV(major, unit));
1005 device_destroy(pt_class, MKDEV(major, unit + 128));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 }
gregkh@suse.dedeb36972005-03-23 09:52:10 -08001007 class_destroy(pt_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 unregister_chrdev(major, name);
1009 for (unit = 0; unit < PT_UNITS; unit++)
1010 if (pt[unit].present)
1011 pi_release(pt[unit].pi);
1012}
1013
1014MODULE_LICENSE("GPL");
1015module_init(pt_init)
1016module_exit(pt_exit)