1 /*
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
112 #include <linux/types.h>
113
114 /* 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
120 static bool verbose = 0;
121 static int major = PT_MAJOR;
122 static char *name = PT_NAME;
123 static int disable = 0;
124
125 static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
126 static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
127 static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
128 static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
129
130 static 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>
146 #include <linux/delay.h>
147 #include <linux/slab.h>
148 #include <linux/mtio.h>
149 #include <linux/device.h>
150 #include <linux/sched.h> /* current, TASK_*, schedule_timeout() */
151 #include <linux/mutex.h>
152
153 #include <asm/uaccess.h>
154
155 module_param(verbose, bool, 0);
156 module_param(major, int, 0);
157 module_param(name, charp, 0);
158 module_param_array(drive0, int, NULL, 0);
159 module_param_array(drive1, int, NULL, 0);
160 module_param_array(drive2, int, NULL, 0);
161 module_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
194 static DEFINE_MUTEX(pt_mutex);
195 static int pt_open(struct inode *inode, struct file *file);
196 static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
197 static int pt_release(struct inode *inode, struct file *file);
198 static ssize_t pt_read(struct file *filp, char __user *buf,
199 size_t count, loff_t * ppos);
200 static ssize_t pt_write(struct file *filp, const char __user *buf,
201 size_t count, loff_t * ppos);
202 static 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
216 struct 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
230 static int pt_identify(struct pt_unit *tape);
231
232 static struct pt_unit pt[PT_UNITS];
233
234 static char pt_scratch[512]; /* scratch block buffer */
235
236 /* kernel glue structures */
237
238 static const struct file_operations pt_fops = {
239 .owner = THIS_MODULE,
240 .read = pt_read,
241 .write = pt_write,
242 .unlocked_ioctl = pt_ioctl,
243 .open = pt_open,
244 .release = pt_release,
245 .llseek = noop_llseek,
246 };
247
248 /* sysfs class support */
249 static struct class *pt_class;
250
status_reg(struct pi_adapter * pi)251 static inline int status_reg(struct pi_adapter *pi)
252 {
253 return pi_read_regr(pi, 1, 6);
254 }
255
read_reg(struct pi_adapter * pi,int reg)256 static inline int read_reg(struct pi_adapter *pi, int reg)
257 {
258 return pi_read_regr(pi, 0, reg);
259 }
260
write_reg(struct pi_adapter * pi,int reg,int val)261 static inline void write_reg(struct pi_adapter *pi, int reg, int val)
262 {
263 pi_write_regr(pi, 0, reg, val);
264 }
265
DRIVE(struct pt_unit * tape)266 static inline u8 DRIVE(struct pt_unit *tape)
267 {
268 return 0xa0+0x10*tape->drive;
269 }
270
pt_wait(struct pt_unit * tape,int go,int stop,char * fun,char * msg)271 static 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
281 if ((r & (STAT_ERR & stop)) || (j > PT_SPIN)) {
282 s = read_reg(pi, 7);
283 e = read_reg(pi, 1);
284 p = read_reg(pi, 2);
285 if (j > PT_SPIN)
286 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
pt_command(struct pt_unit * tape,char * cmd,int dlen,char * fun)296 static 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
pt_completion(struct pt_unit * tape,char * buf,char * fun)328 static 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
pt_req_sense(struct pt_unit * tape,int quiet)353 static 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
pt_atapi(struct pt_unit * tape,char * cmd,int dlen,char * buf,char * fun)374 static 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
pt_sleep(int cs)388 static void pt_sleep(int cs)
389 {
390 schedule_timeout_interruptible(cs);
391 }
392
pt_poll_dsc(struct pt_unit * tape,int pause,int tmo,char * msg)393 static 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
pt_media_access_cmd(struct pt_unit * tape,int tmo,char * cmd,char * fun)424 static 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
pt_rewind(struct pt_unit * tape)434 static 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
pt_write_fm(struct pt_unit * tape)441 static 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
pt_reset(struct pt_unit * tape)450 static 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
pt_ready_wait(struct pt_unit * tape,int tmo)483 static 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
xs(char * buf,char * targ,int offs,int len)503 static 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
xn(char * buf,int offs,int size)517 static 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
pt_identify(struct pt_unit * tape)527 static 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 */
pt_probe(struct pt_unit * tape)587 static 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
pt_detect(void)600 static 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
pt_open(struct inode * inode,struct file * file)651 static 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
657 mutex_lock(&pt_mutex);
658 if (unit >= PT_UNITS || (!tape->present)) {
659 mutex_unlock(&pt_mutex);
660 return -ENODEV;
661 }
662
663 err = -EBUSY;
664 if (!atomic_dec_and_test(&tape->available))
665 goto out;
666
667 pt_identify(tape);
668
669 err = -ENODEV;
670 if (!(tape->flags & PT_MEDIA))
671 goto out;
672
673 err = -EROFS;
674 if ((!(tape->flags & PT_WRITE_OK)) && (file->f_mode & FMODE_WRITE))
675 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;
688 mutex_unlock(&pt_mutex);
689 return 0;
690
691 out:
692 atomic_inc(&tape->available);
693 mutex_unlock(&pt_mutex);
694 return err;
695 }
696
pt_ioctl(struct file * file,unsigned int cmd,unsigned long arg)697 static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
698 {
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:
711 mutex_lock(&pt_mutex);
712 pt_rewind(tape);
713 mutex_unlock(&pt_mutex);
714 return 0;
715
716 case MTWEOF:
717 mutex_lock(&pt_mutex);
718 pt_write_fm(tape);
719 mutex_unlock(&pt_mutex);
720 return 0;
721
722 default:
723 /* FIXME: rate limit ?? */
724 printk(KERN_DEBUG "%s: Unimplemented mt_op %d\n", tape->name,
725 mtop.mt_op);
726 return -EINVAL;
727 }
728
729 default:
730 return -ENOTTY;
731 }
732 }
733
734 static int
pt_release(struct inode * inode,struct file * file)735 pt_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
pt_read(struct file * filp,char __user * buf,size_t count,loff_t * ppos)757 static 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
pt_write(struct file * filp,const char __user * buf,size_t count,loff_t * ppos)854 static 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
pt_init(void)954 static int __init pt_init(void)
955 {
956 int unit;
957 int err;
958
959 if (disable) {
960 err = -EINVAL;
961 goto out;
962 }
963
964 if (pt_detect()) {
965 err = -ENODEV;
966 goto out;
967 }
968
969 err = register_chrdev(major, name, &pt_fops);
970 if (err < 0) {
971 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);
975 goto out;
976 }
977 major = err;
978 pt_class = class_create(THIS_MODULE, "pt");
979 if (IS_ERR(pt_class)) {
980 err = PTR_ERR(pt_class);
981 goto out_chrdev;
982 }
983
984 for (unit = 0; unit < PT_UNITS; unit++)
985 if (pt[unit].present) {
986 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);
990 }
991 goto out;
992
993 out_chrdev:
994 unregister_chrdev(major, "pt");
995 out:
996 return err;
997 }
998
pt_exit(void)999 static void __exit pt_exit(void)
1000 {
1001 int unit;
1002 for (unit = 0; unit < PT_UNITS; unit++)
1003 if (pt[unit].present) {
1004 device_destroy(pt_class, MKDEV(major, unit));
1005 device_destroy(pt_class, MKDEV(major, unit + 128));
1006 }
1007 class_destroy(pt_class);
1008 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
1014 MODULE_LICENSE("GPL");
1015 module_init(pt_init)
1016 module_exit(pt_exit)
1017