Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | /* Here are things one can override from the insmod command. | |
113 | Most are autoprobed by paride unless set here. Verbose is on | |
114 | by default. | |
115 | ||
116 | */ | |
117 | ||
118 | static int verbose = 0; | |
119 | static int major = PT_MAJOR; | |
120 | static char *name = PT_NAME; | |
121 | static int disable = 0; | |
122 | ||
123 | static int drive0[6] = { 0, 0, 0, -1, -1, -1 }; | |
124 | static int drive1[6] = { 0, 0, 0, -1, -1, -1 }; | |
125 | static int drive2[6] = { 0, 0, 0, -1, -1, -1 }; | |
126 | static int drive3[6] = { 0, 0, 0, -1, -1, -1 }; | |
127 | ||
128 | static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3}; | |
129 | ||
130 | #define D_PRT 0 | |
131 | #define D_PRO 1 | |
132 | #define D_UNI 2 | |
133 | #define D_MOD 3 | |
134 | #define D_SLV 4 | |
135 | #define D_DLY 5 | |
136 | ||
137 | #define DU (*drives[unit]) | |
138 | ||
139 | /* end of parameters */ | |
140 | ||
141 | #include <linux/module.h> | |
142 | #include <linux/init.h> | |
143 | #include <linux/fs.h> | |
1da177e4 LT |
144 | #include <linux/delay.h> |
145 | #include <linux/slab.h> | |
146 | #include <linux/mtio.h> | |
147 | #include <linux/device.h> | |
4e57b681 | 148 | #include <linux/sched.h> /* current, TASK_*, schedule_timeout() */ |
1da177e4 LT |
149 | |
150 | #include <asm/uaccess.h> | |
151 | ||
152 | module_param(verbose, bool, 0); | |
153 | module_param(major, int, 0); | |
154 | module_param(name, charp, 0); | |
155 | module_param_array(drive0, int, NULL, 0); | |
156 | module_param_array(drive1, int, NULL, 0); | |
157 | module_param_array(drive2, int, NULL, 0); | |
158 | module_param_array(drive3, int, NULL, 0); | |
159 | ||
160 | #include "paride.h" | |
161 | ||
162 | #define PT_MAX_RETRIES 5 | |
163 | #define PT_TMO 3000 /* interrupt timeout in jiffies */ | |
164 | #define PT_SPIN_DEL 50 /* spin delay in micro-seconds */ | |
165 | #define PT_RESET_TMO 30 /* 30 seconds */ | |
166 | #define PT_READY_TMO 60 /* 60 seconds */ | |
167 | #define PT_REWIND_TMO 1200 /* 20 minutes */ | |
168 | ||
169 | #define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO) | |
170 | ||
171 | #define STAT_ERR 0x00001 | |
172 | #define STAT_INDEX 0x00002 | |
173 | #define STAT_ECC 0x00004 | |
174 | #define STAT_DRQ 0x00008 | |
175 | #define STAT_SEEK 0x00010 | |
176 | #define STAT_WRERR 0x00020 | |
177 | #define STAT_READY 0x00040 | |
178 | #define STAT_BUSY 0x00080 | |
179 | #define STAT_SENSE 0x1f000 | |
180 | ||
181 | #define ATAPI_TEST_READY 0x00 | |
182 | #define ATAPI_REWIND 0x01 | |
183 | #define ATAPI_REQ_SENSE 0x03 | |
184 | #define ATAPI_READ_6 0x08 | |
185 | #define ATAPI_WRITE_6 0x0a | |
186 | #define ATAPI_WFM 0x10 | |
187 | #define ATAPI_IDENTIFY 0x12 | |
188 | #define ATAPI_MODE_SENSE 0x1a | |
189 | #define ATAPI_LOG_SENSE 0x4d | |
190 | ||
191 | static int pt_open(struct inode *inode, struct file *file); | |
192 | static int pt_ioctl(struct inode *inode, struct file *file, | |
193 | unsigned int cmd, unsigned long arg); | |
194 | static int pt_release(struct inode *inode, struct file *file); | |
195 | static ssize_t pt_read(struct file *filp, char __user *buf, | |
196 | size_t count, loff_t * ppos); | |
197 | static ssize_t pt_write(struct file *filp, const char __user *buf, | |
198 | size_t count, loff_t * ppos); | |
199 | static int pt_detect(void); | |
200 | ||
201 | /* bits in tape->flags */ | |
202 | ||
203 | #define PT_MEDIA 1 | |
204 | #define PT_WRITE_OK 2 | |
205 | #define PT_REWIND 4 | |
206 | #define PT_WRITING 8 | |
207 | #define PT_READING 16 | |
208 | #define PT_EOF 32 | |
209 | ||
210 | #define PT_NAMELEN 8 | |
211 | #define PT_BUFSIZE 16384 | |
212 | ||
213 | struct pt_unit { | |
214 | struct pi_adapter pia; /* interface to paride layer */ | |
215 | struct pi_adapter *pi; | |
216 | int flags; /* various state flags */ | |
217 | int last_sense; /* result of last request sense */ | |
218 | int drive; /* drive */ | |
219 | atomic_t available; /* 1 if access is available 0 otherwise */ | |
220 | int bs; /* block size */ | |
221 | int capacity; /* Size of tape in KB */ | |
222 | int present; /* device present ? */ | |
223 | char *bufptr; | |
224 | char name[PT_NAMELEN]; /* pf0, pf1, ... */ | |
225 | }; | |
226 | ||
227 | static int pt_identify(struct pt_unit *tape); | |
228 | ||
229 | static struct pt_unit pt[PT_UNITS]; | |
230 | ||
231 | static char pt_scratch[512]; /* scratch block buffer */ | |
232 | ||
233 | /* kernel glue structures */ | |
234 | ||
2b8693c0 | 235 | static const struct file_operations pt_fops = { |
1da177e4 LT |
236 | .owner = THIS_MODULE, |
237 | .read = pt_read, | |
238 | .write = pt_write, | |
239 | .ioctl = pt_ioctl, | |
240 | .open = pt_open, | |
241 | .release = pt_release, | |
242 | }; | |
243 | ||
244 | /* sysfs class support */ | |
deb36970 | 245 | static struct class *pt_class; |
1da177e4 LT |
246 | |
247 | static inline int status_reg(struct pi_adapter *pi) | |
248 | { | |
249 | return pi_read_regr(pi, 1, 6); | |
250 | } | |
251 | ||
252 | static inline int read_reg(struct pi_adapter *pi, int reg) | |
253 | { | |
254 | return pi_read_regr(pi, 0, reg); | |
255 | } | |
256 | ||
257 | static inline void write_reg(struct pi_adapter *pi, int reg, int val) | |
258 | { | |
259 | pi_write_regr(pi, 0, reg, val); | |
260 | } | |
261 | ||
262 | static inline u8 DRIVE(struct pt_unit *tape) | |
263 | { | |
264 | return 0xa0+0x10*tape->drive; | |
265 | } | |
266 | ||
267 | static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg) | |
268 | { | |
269 | int j, r, e, s, p; | |
270 | struct pi_adapter *pi = tape->pi; | |
271 | ||
272 | j = 0; | |
273 | while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop)))) | |
274 | && (j++ < PT_SPIN)) | |
275 | udelay(PT_SPIN_DEL); | |
276 | ||
277 | if ((r & (STAT_ERR & stop)) || (j >= PT_SPIN)) { | |
278 | s = read_reg(pi, 7); | |
279 | e = read_reg(pi, 1); | |
280 | p = read_reg(pi, 2); | |
281 | if (j >= PT_SPIN) | |
282 | e |= 0x100; | |
283 | if (fun) | |
284 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
285 | " loop=%d phase=%d\n", | |
286 | tape->name, fun, msg, r, s, e, j, p); | |
287 | return (e << 8) + s; | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun) | |
293 | { | |
294 | struct pi_adapter *pi = tape->pi; | |
295 | pi_connect(pi); | |
296 | ||
297 | write_reg(pi, 6, DRIVE(tape)); | |
298 | ||
299 | if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
300 | pi_disconnect(pi); | |
301 | return -1; | |
302 | } | |
303 | ||
304 | write_reg(pi, 4, dlen % 256); | |
305 | write_reg(pi, 5, dlen / 256); | |
306 | write_reg(pi, 7, 0xa0); /* ATAPI packet command */ | |
307 | ||
308 | if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
309 | pi_disconnect(pi); | |
310 | return -1; | |
311 | } | |
312 | ||
313 | if (read_reg(pi, 2) != 1) { | |
314 | printk("%s: %s: command phase error\n", tape->name, fun); | |
315 | pi_disconnect(pi); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | pi_write_block(pi, cmd, 12); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int pt_completion(struct pt_unit *tape, char *buf, char *fun) | |
325 | { | |
326 | struct pi_adapter *pi = tape->pi; | |
327 | int r, s, n, p; | |
328 | ||
329 | r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
330 | fun, "completion"); | |
331 | ||
332 | if (read_reg(pi, 7) & STAT_DRQ) { | |
333 | n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) + | |
334 | 3) & 0xfffc); | |
335 | p = read_reg(pi, 2) & 3; | |
336 | if (p == 0) | |
337 | pi_write_block(pi, buf, n); | |
338 | if (p == 2) | |
339 | pi_read_block(pi, buf, n); | |
340 | } | |
341 | ||
342 | s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
343 | ||
344 | pi_disconnect(pi); | |
345 | ||
346 | return (r ? r : s); | |
347 | } | |
348 | ||
349 | static void pt_req_sense(struct pt_unit *tape, int quiet) | |
350 | { | |
351 | char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
352 | char buf[16]; | |
353 | int r; | |
354 | ||
355 | r = pt_command(tape, rs_cmd, 16, "Request sense"); | |
356 | mdelay(1); | |
357 | if (!r) | |
358 | pt_completion(tape, buf, "Request sense"); | |
359 | ||
360 | tape->last_sense = -1; | |
361 | if (!r) { | |
362 | if (!quiet) | |
363 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
364 | tape->name, buf[2] & 0xf, buf[12], buf[13]); | |
365 | tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8) | |
366 | | ((buf[13] & 0xff) << 16); | |
367 | } | |
368 | } | |
369 | ||
370 | static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun) | |
371 | { | |
372 | int r; | |
373 | ||
374 | r = pt_command(tape, cmd, dlen, fun); | |
375 | mdelay(1); | |
376 | if (!r) | |
377 | r = pt_completion(tape, buf, fun); | |
378 | if (r) | |
379 | pt_req_sense(tape, !fun); | |
380 | ||
381 | return r; | |
382 | } | |
383 | ||
384 | static void pt_sleep(int cs) | |
385 | { | |
86e84862 | 386 | schedule_timeout_interruptible(cs); |
1da177e4 LT |
387 | } |
388 | ||
389 | static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg) | |
390 | { | |
391 | struct pi_adapter *pi = tape->pi; | |
392 | int k, e, s; | |
393 | ||
394 | k = 0; | |
395 | e = 0; | |
396 | s = 0; | |
397 | while (k < tmo) { | |
398 | pt_sleep(pause); | |
399 | k++; | |
400 | pi_connect(pi); | |
401 | write_reg(pi, 6, DRIVE(tape)); | |
402 | s = read_reg(pi, 7); | |
403 | e = read_reg(pi, 1); | |
404 | pi_disconnect(pi); | |
405 | if (s & (STAT_ERR | STAT_SEEK)) | |
406 | break; | |
407 | } | |
408 | if ((k >= tmo) || (s & STAT_ERR)) { | |
409 | if (k >= tmo) | |
410 | printk("%s: %s DSC timeout\n", tape->name, msg); | |
411 | else | |
412 | printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s, | |
413 | e); | |
414 | pt_req_sense(tape, 0); | |
415 | return 0; | |
416 | } | |
417 | return 1; | |
418 | } | |
419 | ||
420 | static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun) | |
421 | { | |
422 | if (pt_command(tape, cmd, 0, fun)) { | |
423 | pt_req_sense(tape, 0); | |
424 | return; | |
425 | } | |
426 | pi_disconnect(tape->pi); | |
427 | pt_poll_dsc(tape, HZ, tmo, fun); | |
428 | } | |
429 | ||
430 | static void pt_rewind(struct pt_unit *tape) | |
431 | { | |
432 | char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
433 | ||
434 | pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind"); | |
435 | } | |
436 | ||
437 | static void pt_write_fm(struct pt_unit *tape) | |
438 | { | |
439 | char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 }; | |
440 | ||
441 | pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark"); | |
442 | } | |
443 | ||
444 | #define DBMSG(msg) ((verbose>1)?(msg):NULL) | |
445 | ||
446 | static int pt_reset(struct pt_unit *tape) | |
447 | { | |
448 | struct pi_adapter *pi = tape->pi; | |
449 | int i, k, flg; | |
450 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
451 | ||
452 | pi_connect(pi); | |
453 | write_reg(pi, 6, DRIVE(tape)); | |
454 | write_reg(pi, 7, 8); | |
455 | ||
456 | pt_sleep(20 * HZ / 1000); | |
457 | ||
458 | k = 0; | |
459 | while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY)) | |
460 | pt_sleep(HZ / 10); | |
461 | ||
462 | flg = 1; | |
463 | for (i = 0; i < 5; i++) | |
464 | flg &= (read_reg(pi, i + 1) == expect[i]); | |
465 | ||
466 | if (verbose) { | |
467 | printk("%s: Reset (%d) signature = ", tape->name, k); | |
468 | for (i = 0; i < 5; i++) | |
469 | printk("%3x", read_reg(pi, i + 1)); | |
470 | if (!flg) | |
471 | printk(" (incorrect)"); | |
472 | printk("\n"); | |
473 | } | |
474 | ||
475 | pi_disconnect(pi); | |
476 | return flg - 1; | |
477 | } | |
478 | ||
479 | static int pt_ready_wait(struct pt_unit *tape, int tmo) | |
480 | { | |
481 | char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
482 | int k, p; | |
483 | ||
484 | k = 0; | |
485 | while (k < tmo) { | |
486 | tape->last_sense = 0; | |
487 | pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready")); | |
488 | p = tape->last_sense; | |
489 | if (!p) | |
490 | return 0; | |
491 | if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6))) | |
492 | return p; | |
493 | k++; | |
494 | pt_sleep(HZ); | |
495 | } | |
496 | return 0x000020; /* timeout */ | |
497 | } | |
498 | ||
499 | static void xs(char *buf, char *targ, int offs, int len) | |
500 | { | |
501 | int j, k, l; | |
502 | ||
503 | j = 0; | |
504 | l = 0; | |
505 | for (k = 0; k < len; k++) | |
506 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
507 | l = targ[j++] = buf[k + offs]; | |
508 | if (l == 0x20) | |
509 | j--; | |
510 | targ[j] = 0; | |
511 | } | |
512 | ||
513 | static int xn(char *buf, int offs, int size) | |
514 | { | |
515 | int v, k; | |
516 | ||
517 | v = 0; | |
518 | for (k = 0; k < size; k++) | |
519 | v = v * 256 + (buf[k + offs] & 0xff); | |
520 | return v; | |
521 | } | |
522 | ||
523 | static int pt_identify(struct pt_unit *tape) | |
524 | { | |
525 | int dt, s; | |
526 | char *ms[2] = { "master", "slave" }; | |
527 | char mf[10], id[18]; | |
528 | char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
529 | char ms_cmd[12] = | |
530 | { ATAPI_MODE_SENSE, 0, 0x2a, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
531 | char ls_cmd[12] = | |
532 | { ATAPI_LOG_SENSE, 0, 0x71, 0, 0, 0, 0, 0, 36, 0, 0, 0 }; | |
533 | char buf[36]; | |
534 | ||
535 | s = pt_atapi(tape, id_cmd, 36, buf, "identify"); | |
536 | if (s) | |
537 | return -1; | |
538 | ||
539 | dt = buf[0] & 0x1f; | |
540 | if (dt != 1) { | |
541 | if (verbose) | |
542 | printk("%s: Drive %d, unsupported type %d\n", | |
543 | tape->name, tape->drive, dt); | |
544 | return -1; | |
545 | } | |
546 | ||
547 | xs(buf, mf, 8, 8); | |
548 | xs(buf, id, 16, 16); | |
549 | ||
550 | tape->flags = 0; | |
551 | tape->capacity = 0; | |
552 | tape->bs = 0; | |
553 | ||
554 | if (!pt_ready_wait(tape, PT_READY_TMO)) | |
555 | tape->flags |= PT_MEDIA; | |
556 | ||
557 | if (!pt_atapi(tape, ms_cmd, 36, buf, "mode sense")) { | |
558 | if (!(buf[2] & 0x80)) | |
559 | tape->flags |= PT_WRITE_OK; | |
560 | tape->bs = xn(buf, 10, 2); | |
561 | } | |
562 | ||
563 | if (!pt_atapi(tape, ls_cmd, 36, buf, "log sense")) | |
564 | tape->capacity = xn(buf, 24, 4); | |
565 | ||
566 | printk("%s: %s %s, %s", tape->name, mf, id, ms[tape->drive]); | |
567 | if (!(tape->flags & PT_MEDIA)) | |
568 | printk(", no media\n"); | |
569 | else { | |
570 | if (!(tape->flags & PT_WRITE_OK)) | |
571 | printk(", RO"); | |
572 | printk(", blocksize %d, %d MB\n", tape->bs, tape->capacity / 1024); | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | ||
579 | /* | |
580 | * returns 0, with id set if drive is detected | |
581 | * -1, if drive detection failed | |
582 | */ | |
583 | static int pt_probe(struct pt_unit *tape) | |
584 | { | |
585 | if (tape->drive == -1) { | |
586 | for (tape->drive = 0; tape->drive <= 1; tape->drive++) | |
587 | if (!pt_reset(tape)) | |
588 | return pt_identify(tape); | |
589 | } else { | |
590 | if (!pt_reset(tape)) | |
591 | return pt_identify(tape); | |
592 | } | |
593 | return -1; | |
594 | } | |
595 | ||
596 | static int pt_detect(void) | |
597 | { | |
598 | struct pt_unit *tape; | |
599 | int specified = 0, found = 0; | |
600 | int unit; | |
601 | ||
602 | printk("%s: %s version %s, major %d\n", name, name, PT_VERSION, major); | |
603 | ||
604 | specified = 0; | |
605 | for (unit = 0; unit < PT_UNITS; unit++) { | |
606 | struct pt_unit *tape = &pt[unit]; | |
607 | tape->pi = &tape->pia; | |
608 | atomic_set(&tape->available, 1); | |
609 | tape->flags = 0; | |
610 | tape->last_sense = 0; | |
611 | tape->present = 0; | |
612 | tape->bufptr = NULL; | |
613 | tape->drive = DU[D_SLV]; | |
614 | snprintf(tape->name, PT_NAMELEN, "%s%d", name, unit); | |
615 | if (!DU[D_PRT]) | |
616 | continue; | |
617 | specified++; | |
618 | if (pi_init(tape->pi, 0, DU[D_PRT], DU[D_MOD], DU[D_UNI], | |
619 | DU[D_PRO], DU[D_DLY], pt_scratch, PI_PT, | |
620 | verbose, tape->name)) { | |
621 | if (!pt_probe(tape)) { | |
622 | tape->present = 1; | |
623 | found++; | |
624 | } else | |
625 | pi_release(tape->pi); | |
626 | } | |
627 | } | |
628 | if (specified == 0) { | |
629 | tape = pt; | |
630 | if (pi_init(tape->pi, 1, -1, -1, -1, -1, -1, pt_scratch, | |
631 | PI_PT, verbose, tape->name)) { | |
632 | if (!pt_probe(tape)) { | |
633 | tape->present = 1; | |
634 | found++; | |
635 | } else | |
636 | pi_release(tape->pi); | |
637 | } | |
638 | ||
639 | } | |
640 | if (found) | |
641 | return 0; | |
642 | ||
643 | printk("%s: No ATAPI tape drive detected\n", name); | |
644 | return -1; | |
645 | } | |
646 | ||
647 | static int pt_open(struct inode *inode, struct file *file) | |
648 | { | |
649 | int unit = iminor(inode) & 0x7F; | |
650 | struct pt_unit *tape = pt + unit; | |
651 | int err; | |
652 | ||
653 | if (unit >= PT_UNITS || (!tape->present)) | |
654 | return -ENODEV; | |
655 | ||
656 | err = -EBUSY; | |
657 | if (!atomic_dec_and_test(&tape->available)) | |
658 | goto out; | |
659 | ||
660 | pt_identify(tape); | |
661 | ||
662 | err = -ENODEV; | |
eaa0ff15 | 663 | if (!(tape->flags & PT_MEDIA)) |
1da177e4 LT |
664 | goto out; |
665 | ||
666 | err = -EROFS; | |
b07989f5 | 667 | if ((!(tape->flags & PT_WRITE_OK)) && (file->f_mode & 2)) |
1da177e4 LT |
668 | goto out; |
669 | ||
670 | if (!(iminor(inode) & 128)) | |
671 | tape->flags |= PT_REWIND; | |
672 | ||
673 | err = -ENOMEM; | |
674 | tape->bufptr = kmalloc(PT_BUFSIZE, GFP_KERNEL); | |
675 | if (tape->bufptr == NULL) { | |
676 | printk("%s: buffer allocation failed\n", tape->name); | |
677 | goto out; | |
678 | } | |
679 | ||
680 | file->private_data = tape; | |
681 | return 0; | |
682 | ||
683 | out: | |
684 | atomic_inc(&tape->available); | |
685 | return err; | |
686 | } | |
687 | ||
688 | static int pt_ioctl(struct inode *inode, struct file *file, | |
689 | unsigned int cmd, unsigned long arg) | |
690 | { | |
691 | struct pt_unit *tape = file->private_data; | |
692 | struct mtop __user *p = (void __user *)arg; | |
693 | struct mtop mtop; | |
694 | ||
695 | switch (cmd) { | |
696 | case MTIOCTOP: | |
697 | if (copy_from_user(&mtop, p, sizeof(struct mtop))) | |
698 | return -EFAULT; | |
699 | ||
700 | switch (mtop.mt_op) { | |
701 | ||
702 | case MTREW: | |
703 | pt_rewind(tape); | |
704 | return 0; | |
705 | ||
706 | case MTWEOF: | |
707 | pt_write_fm(tape); | |
708 | return 0; | |
709 | ||
710 | default: | |
711 | printk("%s: Unimplemented mt_op %d\n", tape->name, | |
712 | mtop.mt_op); | |
713 | return -EINVAL; | |
714 | } | |
715 | ||
716 | default: | |
717 | printk("%s: Unimplemented ioctl 0x%x\n", tape->name, cmd); | |
718 | return -EINVAL; | |
719 | ||
720 | } | |
721 | } | |
722 | ||
723 | static int | |
724 | pt_release(struct inode *inode, struct file *file) | |
725 | { | |
726 | struct pt_unit *tape = file->private_data; | |
727 | ||
728 | if (atomic_read(&tape->available) > 1) | |
729 | return -EINVAL; | |
730 | ||
731 | if (tape->flags & PT_WRITING) | |
732 | pt_write_fm(tape); | |
733 | ||
734 | if (tape->flags & PT_REWIND) | |
735 | pt_rewind(tape); | |
736 | ||
737 | kfree(tape->bufptr); | |
738 | tape->bufptr = NULL; | |
739 | ||
740 | atomic_inc(&tape->available); | |
741 | ||
742 | return 0; | |
743 | ||
744 | } | |
745 | ||
746 | static ssize_t pt_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
747 | { | |
748 | struct pt_unit *tape = filp->private_data; | |
749 | struct pi_adapter *pi = tape->pi; | |
750 | char rd_cmd[12] = { ATAPI_READ_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
751 | int k, n, r, p, s, t, b; | |
752 | ||
753 | if (!(tape->flags & (PT_READING | PT_WRITING))) { | |
754 | tape->flags |= PT_READING; | |
755 | if (pt_atapi(tape, rd_cmd, 0, NULL, "start read-ahead")) | |
756 | return -EIO; | |
757 | } else if (tape->flags & PT_WRITING) | |
758 | return -EIO; | |
759 | ||
760 | if (tape->flags & PT_EOF) | |
761 | return 0; | |
762 | ||
763 | t = 0; | |
764 | ||
765 | while (count > 0) { | |
766 | ||
767 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "read")) | |
768 | return -EIO; | |
769 | ||
770 | n = count; | |
771 | if (n > 32768) | |
772 | n = 32768; /* max per command */ | |
773 | b = (n - 1 + tape->bs) / tape->bs; | |
774 | n = b * tape->bs; /* rounded up to even block */ | |
775 | ||
776 | rd_cmd[4] = b; | |
777 | ||
778 | r = pt_command(tape, rd_cmd, n, "read"); | |
779 | ||
780 | mdelay(1); | |
781 | ||
782 | if (r) { | |
783 | pt_req_sense(tape, 0); | |
784 | return -EIO; | |
785 | } | |
786 | ||
787 | while (1) { | |
788 | ||
789 | r = pt_wait(tape, STAT_BUSY, | |
790 | STAT_DRQ | STAT_ERR | STAT_READY, | |
791 | DBMSG("read DRQ"), ""); | |
792 | ||
793 | if (r & STAT_SENSE) { | |
794 | pi_disconnect(pi); | |
795 | pt_req_sense(tape, 0); | |
796 | return -EIO; | |
797 | } | |
798 | ||
799 | if (r) | |
800 | tape->flags |= PT_EOF; | |
801 | ||
802 | s = read_reg(pi, 7); | |
803 | ||
804 | if (!(s & STAT_DRQ)) | |
805 | break; | |
806 | ||
807 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); | |
808 | p = (read_reg(pi, 2) & 3); | |
809 | if (p != 2) { | |
810 | pi_disconnect(pi); | |
811 | printk("%s: Phase error on read: %d\n", tape->name, | |
812 | p); | |
813 | return -EIO; | |
814 | } | |
815 | ||
816 | while (n > 0) { | |
817 | k = n; | |
818 | if (k > PT_BUFSIZE) | |
819 | k = PT_BUFSIZE; | |
820 | pi_read_block(pi, tape->bufptr, k); | |
821 | n -= k; | |
822 | b = k; | |
823 | if (b > count) | |
824 | b = count; | |
825 | if (copy_to_user(buf + t, tape->bufptr, b)) { | |
826 | pi_disconnect(pi); | |
827 | return -EFAULT; | |
828 | } | |
829 | t += b; | |
830 | count -= b; | |
831 | } | |
832 | ||
833 | } | |
834 | pi_disconnect(pi); | |
835 | if (tape->flags & PT_EOF) | |
836 | break; | |
837 | } | |
838 | ||
839 | return t; | |
840 | ||
841 | } | |
842 | ||
843 | static ssize_t pt_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
844 | { | |
845 | struct pt_unit *tape = filp->private_data; | |
846 | struct pi_adapter *pi = tape->pi; | |
847 | char wr_cmd[12] = { ATAPI_WRITE_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
848 | int k, n, r, p, s, t, b; | |
849 | ||
850 | if (!(tape->flags & PT_WRITE_OK)) | |
851 | return -EROFS; | |
852 | ||
853 | if (!(tape->flags & (PT_READING | PT_WRITING))) { | |
854 | tape->flags |= PT_WRITING; | |
855 | if (pt_atapi | |
856 | (tape, wr_cmd, 0, NULL, "start buffer-available mode")) | |
857 | return -EIO; | |
858 | } else if (tape->flags & PT_READING) | |
859 | return -EIO; | |
860 | ||
861 | if (tape->flags & PT_EOF) | |
862 | return -ENOSPC; | |
863 | ||
864 | t = 0; | |
865 | ||
866 | while (count > 0) { | |
867 | ||
868 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "write")) | |
869 | return -EIO; | |
870 | ||
871 | n = count; | |
872 | if (n > 32768) | |
873 | n = 32768; /* max per command */ | |
874 | b = (n - 1 + tape->bs) / tape->bs; | |
875 | n = b * tape->bs; /* rounded up to even block */ | |
876 | ||
877 | wr_cmd[4] = b; | |
878 | ||
879 | r = pt_command(tape, wr_cmd, n, "write"); | |
880 | ||
881 | mdelay(1); | |
882 | ||
883 | if (r) { /* error delivering command only */ | |
884 | pt_req_sense(tape, 0); | |
885 | return -EIO; | |
886 | } | |
887 | ||
888 | while (1) { | |
889 | ||
890 | r = pt_wait(tape, STAT_BUSY, | |
891 | STAT_DRQ | STAT_ERR | STAT_READY, | |
892 | DBMSG("write DRQ"), NULL); | |
893 | ||
894 | if (r & STAT_SENSE) { | |
895 | pi_disconnect(pi); | |
896 | pt_req_sense(tape, 0); | |
897 | return -EIO; | |
898 | } | |
899 | ||
900 | if (r) | |
901 | tape->flags |= PT_EOF; | |
902 | ||
903 | s = read_reg(pi, 7); | |
904 | ||
905 | if (!(s & STAT_DRQ)) | |
906 | break; | |
907 | ||
908 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); | |
909 | p = (read_reg(pi, 2) & 3); | |
910 | if (p != 0) { | |
911 | pi_disconnect(pi); | |
912 | printk("%s: Phase error on write: %d \n", | |
913 | tape->name, p); | |
914 | return -EIO; | |
915 | } | |
916 | ||
917 | while (n > 0) { | |
918 | k = n; | |
919 | if (k > PT_BUFSIZE) | |
920 | k = PT_BUFSIZE; | |
921 | b = k; | |
922 | if (b > count) | |
923 | b = count; | |
924 | if (copy_from_user(tape->bufptr, buf + t, b)) { | |
925 | pi_disconnect(pi); | |
926 | return -EFAULT; | |
927 | } | |
928 | pi_write_block(pi, tape->bufptr, k); | |
929 | t += b; | |
930 | count -= b; | |
931 | n -= k; | |
932 | } | |
933 | ||
934 | } | |
935 | pi_disconnect(pi); | |
936 | if (tape->flags & PT_EOF) | |
937 | break; | |
938 | } | |
939 | ||
940 | return t; | |
941 | } | |
942 | ||
943 | static int __init pt_init(void) | |
944 | { | |
829d5f68 AM |
945 | int unit; |
946 | int err; | |
1da177e4 LT |
947 | |
948 | if (disable) { | |
8bca98ca | 949 | err = -EINVAL; |
1da177e4 LT |
950 | goto out; |
951 | } | |
952 | ||
953 | if (pt_detect()) { | |
8bca98ca | 954 | err = -ENODEV; |
1da177e4 LT |
955 | goto out; |
956 | } | |
957 | ||
829d5f68 AM |
958 | err = register_chrdev(major, name, &pt_fops); |
959 | if (err < 0) { | |
1da177e4 LT |
960 | printk("pt_init: unable to get major number %d\n", major); |
961 | for (unit = 0; unit < PT_UNITS; unit++) | |
962 | if (pt[unit].present) | |
963 | pi_release(pt[unit].pi); | |
1da177e4 LT |
964 | goto out; |
965 | } | |
829d5f68 | 966 | major = err; |
deb36970 | 967 | pt_class = class_create(THIS_MODULE, "pt"); |
1da177e4 LT |
968 | if (IS_ERR(pt_class)) { |
969 | err = PTR_ERR(pt_class); | |
970 | goto out_chrdev; | |
971 | } | |
972 | ||
1da177e4 LT |
973 | for (unit = 0; unit < PT_UNITS; unit++) |
974 | if (pt[unit].present) { | |
aa275826 TJ |
975 | device_create(pt_class, NULL, MKDEV(major, unit), |
976 | "pt%d", unit); | |
977 | device_create(pt_class, NULL, MKDEV(major, unit + 128), | |
978 | "pt%dn", unit); | |
1da177e4 LT |
979 | } |
980 | goto out; | |
981 | ||
1da177e4 LT |
982 | out_chrdev: |
983 | unregister_chrdev(major, "pt"); | |
984 | out: | |
985 | return err; | |
986 | } | |
987 | ||
988 | static void __exit pt_exit(void) | |
989 | { | |
990 | int unit; | |
991 | for (unit = 0; unit < PT_UNITS; unit++) | |
992 | if (pt[unit].present) { | |
aa275826 TJ |
993 | device_destroy(pt_class, MKDEV(major, unit)); |
994 | device_destroy(pt_class, MKDEV(major, unit + 128)); | |
1da177e4 | 995 | } |
deb36970 | 996 | class_destroy(pt_class); |
1da177e4 LT |
997 | unregister_chrdev(major, name); |
998 | for (unit = 0; unit < PT_UNITS; unit++) | |
999 | if (pt[unit].present) | |
1000 | pi_release(pt[unit].pi); | |
1001 | } | |
1002 | ||
1003 | MODULE_LICENSE("GPL"); | |
1004 | module_init(pt_init) | |
1005 | module_exit(pt_exit) |