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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() */ |
613655fa | 149 | #include <linux/mutex.h> |
1da177e4 LT |
150 | |
151 | #include <asm/uaccess.h> | |
152 | ||
153 | module_param(verbose, bool, 0); | |
154 | module_param(major, int, 0); | |
155 | module_param(name, charp, 0); | |
156 | module_param_array(drive0, int, NULL, 0); | |
157 | module_param_array(drive1, int, NULL, 0); | |
158 | module_param_array(drive2, int, NULL, 0); | |
159 | module_param_array(drive3, int, NULL, 0); | |
160 | ||
161 | #include "paride.h" | |
162 | ||
163 | #define PT_MAX_RETRIES 5 | |
164 | #define PT_TMO 3000 /* interrupt timeout in jiffies */ | |
165 | #define PT_SPIN_DEL 50 /* spin delay in micro-seconds */ | |
166 | #define PT_RESET_TMO 30 /* 30 seconds */ | |
167 | #define PT_READY_TMO 60 /* 60 seconds */ | |
168 | #define PT_REWIND_TMO 1200 /* 20 minutes */ | |
169 | ||
170 | #define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO) | |
171 | ||
172 | #define STAT_ERR 0x00001 | |
173 | #define STAT_INDEX 0x00002 | |
174 | #define STAT_ECC 0x00004 | |
175 | #define STAT_DRQ 0x00008 | |
176 | #define STAT_SEEK 0x00010 | |
177 | #define STAT_WRERR 0x00020 | |
178 | #define STAT_READY 0x00040 | |
179 | #define STAT_BUSY 0x00080 | |
180 | #define STAT_SENSE 0x1f000 | |
181 | ||
182 | #define ATAPI_TEST_READY 0x00 | |
183 | #define ATAPI_REWIND 0x01 | |
184 | #define ATAPI_REQ_SENSE 0x03 | |
185 | #define ATAPI_READ_6 0x08 | |
186 | #define ATAPI_WRITE_6 0x0a | |
187 | #define ATAPI_WFM 0x10 | |
188 | #define ATAPI_IDENTIFY 0x12 | |
189 | #define ATAPI_MODE_SENSE 0x1a | |
190 | #define ATAPI_LOG_SENSE 0x4d | |
191 | ||
613655fa | 192 | static DEFINE_MUTEX(pt_mutex); |
1da177e4 | 193 | static int pt_open(struct inode *inode, struct file *file); |
be1fd70f | 194 | static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
1da177e4 LT |
195 | static int pt_release(struct inode *inode, struct file *file); |
196 | static ssize_t pt_read(struct file *filp, char __user *buf, | |
197 | size_t count, loff_t * ppos); | |
198 | static ssize_t pt_write(struct file *filp, const char __user *buf, | |
199 | size_t count, loff_t * ppos); | |
200 | static int pt_detect(void); | |
201 | ||
202 | /* bits in tape->flags */ | |
203 | ||
204 | #define PT_MEDIA 1 | |
205 | #define PT_WRITE_OK 2 | |
206 | #define PT_REWIND 4 | |
207 | #define PT_WRITING 8 | |
208 | #define PT_READING 16 | |
209 | #define PT_EOF 32 | |
210 | ||
211 | #define PT_NAMELEN 8 | |
212 | #define PT_BUFSIZE 16384 | |
213 | ||
214 | struct pt_unit { | |
215 | struct pi_adapter pia; /* interface to paride layer */ | |
216 | struct pi_adapter *pi; | |
217 | int flags; /* various state flags */ | |
218 | int last_sense; /* result of last request sense */ | |
219 | int drive; /* drive */ | |
220 | atomic_t available; /* 1 if access is available 0 otherwise */ | |
221 | int bs; /* block size */ | |
222 | int capacity; /* Size of tape in KB */ | |
223 | int present; /* device present ? */ | |
224 | char *bufptr; | |
225 | char name[PT_NAMELEN]; /* pf0, pf1, ... */ | |
226 | }; | |
227 | ||
228 | static int pt_identify(struct pt_unit *tape); | |
229 | ||
230 | static struct pt_unit pt[PT_UNITS]; | |
231 | ||
232 | static char pt_scratch[512]; /* scratch block buffer */ | |
233 | ||
234 | /* kernel glue structures */ | |
235 | ||
2b8693c0 | 236 | static const struct file_operations pt_fops = { |
1da177e4 LT |
237 | .owner = THIS_MODULE, |
238 | .read = pt_read, | |
239 | .write = pt_write, | |
be1fd70f | 240 | .unlocked_ioctl = pt_ioctl, |
1da177e4 LT |
241 | .open = pt_open, |
242 | .release = pt_release, | |
6038f373 | 243 | .llseek = noop_llseek, |
1da177e4 LT |
244 | }; |
245 | ||
246 | /* sysfs class support */ | |
deb36970 | 247 | static struct class *pt_class; |
1da177e4 LT |
248 | |
249 | static inline int status_reg(struct pi_adapter *pi) | |
250 | { | |
251 | return pi_read_regr(pi, 1, 6); | |
252 | } | |
253 | ||
254 | static inline int read_reg(struct pi_adapter *pi, int reg) | |
255 | { | |
256 | return pi_read_regr(pi, 0, reg); | |
257 | } | |
258 | ||
259 | static inline void write_reg(struct pi_adapter *pi, int reg, int val) | |
260 | { | |
261 | pi_write_regr(pi, 0, reg, val); | |
262 | } | |
263 | ||
264 | static inline u8 DRIVE(struct pt_unit *tape) | |
265 | { | |
266 | return 0xa0+0x10*tape->drive; | |
267 | } | |
268 | ||
269 | static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg) | |
270 | { | |
271 | int j, r, e, s, p; | |
272 | struct pi_adapter *pi = tape->pi; | |
273 | ||
274 | j = 0; | |
275 | while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop)))) | |
276 | && (j++ < PT_SPIN)) | |
277 | udelay(PT_SPIN_DEL); | |
278 | ||
c12ec0a2 | 279 | if ((r & (STAT_ERR & stop)) || (j > PT_SPIN)) { |
1da177e4 LT |
280 | s = read_reg(pi, 7); |
281 | e = read_reg(pi, 1); | |
282 | p = read_reg(pi, 2); | |
c12ec0a2 | 283 | if (j > PT_SPIN) |
1da177e4 LT |
284 | e |= 0x100; |
285 | if (fun) | |
286 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
287 | " loop=%d phase=%d\n", | |
288 | tape->name, fun, msg, r, s, e, j, p); | |
289 | return (e << 8) + s; | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun) | |
295 | { | |
296 | struct pi_adapter *pi = tape->pi; | |
297 | pi_connect(pi); | |
298 | ||
299 | write_reg(pi, 6, DRIVE(tape)); | |
300 | ||
301 | if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
302 | pi_disconnect(pi); | |
303 | return -1; | |
304 | } | |
305 | ||
306 | write_reg(pi, 4, dlen % 256); | |
307 | write_reg(pi, 5, dlen / 256); | |
308 | write_reg(pi, 7, 0xa0); /* ATAPI packet command */ | |
309 | ||
310 | if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
311 | pi_disconnect(pi); | |
312 | return -1; | |
313 | } | |
314 | ||
315 | if (read_reg(pi, 2) != 1) { | |
316 | printk("%s: %s: command phase error\n", tape->name, fun); | |
317 | pi_disconnect(pi); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | pi_write_block(pi, cmd, 12); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static int pt_completion(struct pt_unit *tape, char *buf, char *fun) | |
327 | { | |
328 | struct pi_adapter *pi = tape->pi; | |
329 | int r, s, n, p; | |
330 | ||
331 | r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
332 | fun, "completion"); | |
333 | ||
334 | if (read_reg(pi, 7) & STAT_DRQ) { | |
335 | n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) + | |
336 | 3) & 0xfffc); | |
337 | p = read_reg(pi, 2) & 3; | |
338 | if (p == 0) | |
339 | pi_write_block(pi, buf, n); | |
340 | if (p == 2) | |
341 | pi_read_block(pi, buf, n); | |
342 | } | |
343 | ||
344 | s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
345 | ||
346 | pi_disconnect(pi); | |
347 | ||
348 | return (r ? r : s); | |
349 | } | |
350 | ||
351 | static void pt_req_sense(struct pt_unit *tape, int quiet) | |
352 | { | |
353 | char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
354 | char buf[16]; | |
355 | int r; | |
356 | ||
357 | r = pt_command(tape, rs_cmd, 16, "Request sense"); | |
358 | mdelay(1); | |
359 | if (!r) | |
360 | pt_completion(tape, buf, "Request sense"); | |
361 | ||
362 | tape->last_sense = -1; | |
363 | if (!r) { | |
364 | if (!quiet) | |
365 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
366 | tape->name, buf[2] & 0xf, buf[12], buf[13]); | |
367 | tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8) | |
368 | | ((buf[13] & 0xff) << 16); | |
369 | } | |
370 | } | |
371 | ||
372 | static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun) | |
373 | { | |
374 | int r; | |
375 | ||
376 | r = pt_command(tape, cmd, dlen, fun); | |
377 | mdelay(1); | |
378 | if (!r) | |
379 | r = pt_completion(tape, buf, fun); | |
380 | if (r) | |
381 | pt_req_sense(tape, !fun); | |
382 | ||
383 | return r; | |
384 | } | |
385 | ||
386 | static void pt_sleep(int cs) | |
387 | { | |
86e84862 | 388 | schedule_timeout_interruptible(cs); |
1da177e4 LT |
389 | } |
390 | ||
391 | static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg) | |
392 | { | |
393 | struct pi_adapter *pi = tape->pi; | |
394 | int k, e, s; | |
395 | ||
396 | k = 0; | |
397 | e = 0; | |
398 | s = 0; | |
399 | while (k < tmo) { | |
400 | pt_sleep(pause); | |
401 | k++; | |
402 | pi_connect(pi); | |
403 | write_reg(pi, 6, DRIVE(tape)); | |
404 | s = read_reg(pi, 7); | |
405 | e = read_reg(pi, 1); | |
406 | pi_disconnect(pi); | |
407 | if (s & (STAT_ERR | STAT_SEEK)) | |
408 | break; | |
409 | } | |
410 | if ((k >= tmo) || (s & STAT_ERR)) { | |
411 | if (k >= tmo) | |
412 | printk("%s: %s DSC timeout\n", tape->name, msg); | |
413 | else | |
414 | printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s, | |
415 | e); | |
416 | pt_req_sense(tape, 0); | |
417 | return 0; | |
418 | } | |
419 | return 1; | |
420 | } | |
421 | ||
422 | static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun) | |
423 | { | |
424 | if (pt_command(tape, cmd, 0, fun)) { | |
425 | pt_req_sense(tape, 0); | |
426 | return; | |
427 | } | |
428 | pi_disconnect(tape->pi); | |
429 | pt_poll_dsc(tape, HZ, tmo, fun); | |
430 | } | |
431 | ||
432 | static void pt_rewind(struct pt_unit *tape) | |
433 | { | |
434 | char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
435 | ||
436 | pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind"); | |
437 | } | |
438 | ||
439 | static void pt_write_fm(struct pt_unit *tape) | |
440 | { | |
441 | char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 }; | |
442 | ||
443 | pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark"); | |
444 | } | |
445 | ||
446 | #define DBMSG(msg) ((verbose>1)?(msg):NULL) | |
447 | ||
448 | static int pt_reset(struct pt_unit *tape) | |
449 | { | |
450 | struct pi_adapter *pi = tape->pi; | |
451 | int i, k, flg; | |
452 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
453 | ||
454 | pi_connect(pi); | |
455 | write_reg(pi, 6, DRIVE(tape)); | |
456 | write_reg(pi, 7, 8); | |
457 | ||
458 | pt_sleep(20 * HZ / 1000); | |
459 | ||
460 | k = 0; | |
461 | while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY)) | |
462 | pt_sleep(HZ / 10); | |
463 | ||
464 | flg = 1; | |
465 | for (i = 0; i < 5; i++) | |
466 | flg &= (read_reg(pi, i + 1) == expect[i]); | |
467 | ||
468 | if (verbose) { | |
469 | printk("%s: Reset (%d) signature = ", tape->name, k); | |
470 | for (i = 0; i < 5; i++) | |
471 | printk("%3x", read_reg(pi, i + 1)); | |
472 | if (!flg) | |
473 | printk(" (incorrect)"); | |
474 | printk("\n"); | |
475 | } | |
476 | ||
477 | pi_disconnect(pi); | |
478 | return flg - 1; | |
479 | } | |
480 | ||
481 | static int pt_ready_wait(struct pt_unit *tape, int tmo) | |
482 | { | |
483 | char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
484 | int k, p; | |
485 | ||
486 | k = 0; | |
487 | while (k < tmo) { | |
488 | tape->last_sense = 0; | |
489 | pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready")); | |
490 | p = tape->last_sense; | |
491 | if (!p) | |
492 | return 0; | |
493 | if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6))) | |
494 | return p; | |
495 | k++; | |
496 | pt_sleep(HZ); | |
497 | } | |
498 | return 0x000020; /* timeout */ | |
499 | } | |
500 | ||
501 | static void xs(char *buf, char *targ, int offs, int len) | |
502 | { | |
503 | int j, k, l; | |
504 | ||
505 | j = 0; | |
506 | l = 0; | |
507 | for (k = 0; k < len; k++) | |
508 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
509 | l = targ[j++] = buf[k + offs]; | |
510 | if (l == 0x20) | |
511 | j--; | |
512 | targ[j] = 0; | |
513 | } | |
514 | ||
515 | static int xn(char *buf, int offs, int size) | |
516 | { | |
517 | int v, k; | |
518 | ||
519 | v = 0; | |
520 | for (k = 0; k < size; k++) | |
521 | v = v * 256 + (buf[k + offs] & 0xff); | |
522 | return v; | |
523 | } | |
524 | ||
525 | static int pt_identify(struct pt_unit *tape) | |
526 | { | |
527 | int dt, s; | |
528 | char *ms[2] = { "master", "slave" }; | |
529 | char mf[10], id[18]; | |
530 | char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
531 | char ms_cmd[12] = | |
532 | { ATAPI_MODE_SENSE, 0, 0x2a, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
533 | char ls_cmd[12] = | |
534 | { ATAPI_LOG_SENSE, 0, 0x71, 0, 0, 0, 0, 0, 36, 0, 0, 0 }; | |
535 | char buf[36]; | |
536 | ||
537 | s = pt_atapi(tape, id_cmd, 36, buf, "identify"); | |
538 | if (s) | |
539 | return -1; | |
540 | ||
541 | dt = buf[0] & 0x1f; | |
542 | if (dt != 1) { | |
543 | if (verbose) | |
544 | printk("%s: Drive %d, unsupported type %d\n", | |
545 | tape->name, tape->drive, dt); | |
546 | return -1; | |
547 | } | |
548 | ||
549 | xs(buf, mf, 8, 8); | |
550 | xs(buf, id, 16, 16); | |
551 | ||
552 | tape->flags = 0; | |
553 | tape->capacity = 0; | |
554 | tape->bs = 0; | |
555 | ||
556 | if (!pt_ready_wait(tape, PT_READY_TMO)) | |
557 | tape->flags |= PT_MEDIA; | |
558 | ||
559 | if (!pt_atapi(tape, ms_cmd, 36, buf, "mode sense")) { | |
560 | if (!(buf[2] & 0x80)) | |
561 | tape->flags |= PT_WRITE_OK; | |
562 | tape->bs = xn(buf, 10, 2); | |
563 | } | |
564 | ||
565 | if (!pt_atapi(tape, ls_cmd, 36, buf, "log sense")) | |
566 | tape->capacity = xn(buf, 24, 4); | |
567 | ||
568 | printk("%s: %s %s, %s", tape->name, mf, id, ms[tape->drive]); | |
569 | if (!(tape->flags & PT_MEDIA)) | |
570 | printk(", no media\n"); | |
571 | else { | |
572 | if (!(tape->flags & PT_WRITE_OK)) | |
573 | printk(", RO"); | |
574 | printk(", blocksize %d, %d MB\n", tape->bs, tape->capacity / 1024); | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | ||
581 | /* | |
582 | * returns 0, with id set if drive is detected | |
583 | * -1, if drive detection failed | |
584 | */ | |
585 | static int pt_probe(struct pt_unit *tape) | |
586 | { | |
587 | if (tape->drive == -1) { | |
588 | for (tape->drive = 0; tape->drive <= 1; tape->drive++) | |
589 | if (!pt_reset(tape)) | |
590 | return pt_identify(tape); | |
591 | } else { | |
592 | if (!pt_reset(tape)) | |
593 | return pt_identify(tape); | |
594 | } | |
595 | return -1; | |
596 | } | |
597 | ||
598 | static int pt_detect(void) | |
599 | { | |
600 | struct pt_unit *tape; | |
601 | int specified = 0, found = 0; | |
602 | int unit; | |
603 | ||
604 | printk("%s: %s version %s, major %d\n", name, name, PT_VERSION, major); | |
605 | ||
606 | specified = 0; | |
607 | for (unit = 0; unit < PT_UNITS; unit++) { | |
608 | struct pt_unit *tape = &pt[unit]; | |
609 | tape->pi = &tape->pia; | |
610 | atomic_set(&tape->available, 1); | |
611 | tape->flags = 0; | |
612 | tape->last_sense = 0; | |
613 | tape->present = 0; | |
614 | tape->bufptr = NULL; | |
615 | tape->drive = DU[D_SLV]; | |
616 | snprintf(tape->name, PT_NAMELEN, "%s%d", name, unit); | |
617 | if (!DU[D_PRT]) | |
618 | continue; | |
619 | specified++; | |
620 | if (pi_init(tape->pi, 0, DU[D_PRT], DU[D_MOD], DU[D_UNI], | |
621 | DU[D_PRO], DU[D_DLY], pt_scratch, PI_PT, | |
622 | verbose, tape->name)) { | |
623 | if (!pt_probe(tape)) { | |
624 | tape->present = 1; | |
625 | found++; | |
626 | } else | |
627 | pi_release(tape->pi); | |
628 | } | |
629 | } | |
630 | if (specified == 0) { | |
631 | tape = pt; | |
632 | if (pi_init(tape->pi, 1, -1, -1, -1, -1, -1, pt_scratch, | |
633 | PI_PT, verbose, tape->name)) { | |
634 | if (!pt_probe(tape)) { | |
635 | tape->present = 1; | |
636 | found++; | |
637 | } else | |
638 | pi_release(tape->pi); | |
639 | } | |
640 | ||
641 | } | |
642 | if (found) | |
643 | return 0; | |
644 | ||
645 | printk("%s: No ATAPI tape drive detected\n", name); | |
646 | return -1; | |
647 | } | |
648 | ||
649 | static int pt_open(struct inode *inode, struct file *file) | |
650 | { | |
651 | int unit = iminor(inode) & 0x7F; | |
652 | struct pt_unit *tape = pt + unit; | |
653 | int err; | |
654 | ||
613655fa | 655 | mutex_lock(&pt_mutex); |
ea2959a2 | 656 | if (unit >= PT_UNITS || (!tape->present)) { |
613655fa | 657 | mutex_unlock(&pt_mutex); |
1da177e4 | 658 | return -ENODEV; |
ea2959a2 | 659 | } |
1da177e4 LT |
660 | |
661 | err = -EBUSY; | |
662 | if (!atomic_dec_and_test(&tape->available)) | |
663 | goto out; | |
664 | ||
665 | pt_identify(tape); | |
666 | ||
667 | err = -ENODEV; | |
eaa0ff15 | 668 | if (!(tape->flags & PT_MEDIA)) |
1da177e4 LT |
669 | goto out; |
670 | ||
671 | err = -EROFS; | |
aeb5d727 | 672 | if ((!(tape->flags & PT_WRITE_OK)) && (file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
673 | goto out; |
674 | ||
675 | if (!(iminor(inode) & 128)) | |
676 | tape->flags |= PT_REWIND; | |
677 | ||
678 | err = -ENOMEM; | |
679 | tape->bufptr = kmalloc(PT_BUFSIZE, GFP_KERNEL); | |
680 | if (tape->bufptr == NULL) { | |
681 | printk("%s: buffer allocation failed\n", tape->name); | |
682 | goto out; | |
683 | } | |
684 | ||
685 | file->private_data = tape; | |
613655fa | 686 | mutex_unlock(&pt_mutex); |
1da177e4 LT |
687 | return 0; |
688 | ||
689 | out: | |
690 | atomic_inc(&tape->available); | |
613655fa | 691 | mutex_unlock(&pt_mutex); |
1da177e4 LT |
692 | return err; |
693 | } | |
694 | ||
be1fd70f | 695 | static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
696 | { |
697 | struct pt_unit *tape = file->private_data; | |
698 | struct mtop __user *p = (void __user *)arg; | |
699 | struct mtop mtop; | |
700 | ||
701 | switch (cmd) { | |
702 | case MTIOCTOP: | |
703 | if (copy_from_user(&mtop, p, sizeof(struct mtop))) | |
704 | return -EFAULT; | |
705 | ||
706 | switch (mtop.mt_op) { | |
707 | ||
708 | case MTREW: | |
613655fa | 709 | mutex_lock(&pt_mutex); |
1da177e4 | 710 | pt_rewind(tape); |
613655fa | 711 | mutex_unlock(&pt_mutex); |
1da177e4 LT |
712 | return 0; |
713 | ||
714 | case MTWEOF: | |
613655fa | 715 | mutex_lock(&pt_mutex); |
1da177e4 | 716 | pt_write_fm(tape); |
613655fa | 717 | mutex_unlock(&pt_mutex); |
1da177e4 LT |
718 | return 0; |
719 | ||
720 | default: | |
be1fd70f AC |
721 | /* FIXME: rate limit ?? */ |
722 | printk(KERN_DEBUG "%s: Unimplemented mt_op %d\n", tape->name, | |
1da177e4 LT |
723 | mtop.mt_op); |
724 | return -EINVAL; | |
725 | } | |
726 | ||
727 | default: | |
be1fd70f | 728 | return -ENOTTY; |
1da177e4 LT |
729 | } |
730 | } | |
731 | ||
732 | static int | |
733 | pt_release(struct inode *inode, struct file *file) | |
734 | { | |
735 | struct pt_unit *tape = file->private_data; | |
736 | ||
737 | if (atomic_read(&tape->available) > 1) | |
738 | return -EINVAL; | |
739 | ||
740 | if (tape->flags & PT_WRITING) | |
741 | pt_write_fm(tape); | |
742 | ||
743 | if (tape->flags & PT_REWIND) | |
744 | pt_rewind(tape); | |
745 | ||
746 | kfree(tape->bufptr); | |
747 | tape->bufptr = NULL; | |
748 | ||
749 | atomic_inc(&tape->available); | |
750 | ||
751 | return 0; | |
752 | ||
753 | } | |
754 | ||
755 | static ssize_t pt_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
756 | { | |
757 | struct pt_unit *tape = filp->private_data; | |
758 | struct pi_adapter *pi = tape->pi; | |
759 | char rd_cmd[12] = { ATAPI_READ_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
760 | int k, n, r, p, s, t, b; | |
761 | ||
762 | if (!(tape->flags & (PT_READING | PT_WRITING))) { | |
763 | tape->flags |= PT_READING; | |
764 | if (pt_atapi(tape, rd_cmd, 0, NULL, "start read-ahead")) | |
765 | return -EIO; | |
766 | } else if (tape->flags & PT_WRITING) | |
767 | return -EIO; | |
768 | ||
769 | if (tape->flags & PT_EOF) | |
770 | return 0; | |
771 | ||
772 | t = 0; | |
773 | ||
774 | while (count > 0) { | |
775 | ||
776 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "read")) | |
777 | return -EIO; | |
778 | ||
779 | n = count; | |
780 | if (n > 32768) | |
781 | n = 32768; /* max per command */ | |
782 | b = (n - 1 + tape->bs) / tape->bs; | |
783 | n = b * tape->bs; /* rounded up to even block */ | |
784 | ||
785 | rd_cmd[4] = b; | |
786 | ||
787 | r = pt_command(tape, rd_cmd, n, "read"); | |
788 | ||
789 | mdelay(1); | |
790 | ||
791 | if (r) { | |
792 | pt_req_sense(tape, 0); | |
793 | return -EIO; | |
794 | } | |
795 | ||
796 | while (1) { | |
797 | ||
798 | r = pt_wait(tape, STAT_BUSY, | |
799 | STAT_DRQ | STAT_ERR | STAT_READY, | |
800 | DBMSG("read DRQ"), ""); | |
801 | ||
802 | if (r & STAT_SENSE) { | |
803 | pi_disconnect(pi); | |
804 | pt_req_sense(tape, 0); | |
805 | return -EIO; | |
806 | } | |
807 | ||
808 | if (r) | |
809 | tape->flags |= PT_EOF; | |
810 | ||
811 | s = read_reg(pi, 7); | |
812 | ||
813 | if (!(s & STAT_DRQ)) | |
814 | break; | |
815 | ||
816 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); | |
817 | p = (read_reg(pi, 2) & 3); | |
818 | if (p != 2) { | |
819 | pi_disconnect(pi); | |
820 | printk("%s: Phase error on read: %d\n", tape->name, | |
821 | p); | |
822 | return -EIO; | |
823 | } | |
824 | ||
825 | while (n > 0) { | |
826 | k = n; | |
827 | if (k > PT_BUFSIZE) | |
828 | k = PT_BUFSIZE; | |
829 | pi_read_block(pi, tape->bufptr, k); | |
830 | n -= k; | |
831 | b = k; | |
832 | if (b > count) | |
833 | b = count; | |
834 | if (copy_to_user(buf + t, tape->bufptr, b)) { | |
835 | pi_disconnect(pi); | |
836 | return -EFAULT; | |
837 | } | |
838 | t += b; | |
839 | count -= b; | |
840 | } | |
841 | ||
842 | } | |
843 | pi_disconnect(pi); | |
844 | if (tape->flags & PT_EOF) | |
845 | break; | |
846 | } | |
847 | ||
848 | return t; | |
849 | ||
850 | } | |
851 | ||
852 | static ssize_t pt_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
853 | { | |
854 | struct pt_unit *tape = filp->private_data; | |
855 | struct pi_adapter *pi = tape->pi; | |
856 | char wr_cmd[12] = { ATAPI_WRITE_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
857 | int k, n, r, p, s, t, b; | |
858 | ||
859 | if (!(tape->flags & PT_WRITE_OK)) | |
860 | return -EROFS; | |
861 | ||
862 | if (!(tape->flags & (PT_READING | PT_WRITING))) { | |
863 | tape->flags |= PT_WRITING; | |
864 | if (pt_atapi | |
865 | (tape, wr_cmd, 0, NULL, "start buffer-available mode")) | |
866 | return -EIO; | |
867 | } else if (tape->flags & PT_READING) | |
868 | return -EIO; | |
869 | ||
870 | if (tape->flags & PT_EOF) | |
871 | return -ENOSPC; | |
872 | ||
873 | t = 0; | |
874 | ||
875 | while (count > 0) { | |
876 | ||
877 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "write")) | |
878 | return -EIO; | |
879 | ||
880 | n = count; | |
881 | if (n > 32768) | |
882 | n = 32768; /* max per command */ | |
883 | b = (n - 1 + tape->bs) / tape->bs; | |
884 | n = b * tape->bs; /* rounded up to even block */ | |
885 | ||
886 | wr_cmd[4] = b; | |
887 | ||
888 | r = pt_command(tape, wr_cmd, n, "write"); | |
889 | ||
890 | mdelay(1); | |
891 | ||
892 | if (r) { /* error delivering command only */ | |
893 | pt_req_sense(tape, 0); | |
894 | return -EIO; | |
895 | } | |
896 | ||
897 | while (1) { | |
898 | ||
899 | r = pt_wait(tape, STAT_BUSY, | |
900 | STAT_DRQ | STAT_ERR | STAT_READY, | |
901 | DBMSG("write DRQ"), NULL); | |
902 | ||
903 | if (r & STAT_SENSE) { | |
904 | pi_disconnect(pi); | |
905 | pt_req_sense(tape, 0); | |
906 | return -EIO; | |
907 | } | |
908 | ||
909 | if (r) | |
910 | tape->flags |= PT_EOF; | |
911 | ||
912 | s = read_reg(pi, 7); | |
913 | ||
914 | if (!(s & STAT_DRQ)) | |
915 | break; | |
916 | ||
917 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); | |
918 | p = (read_reg(pi, 2) & 3); | |
919 | if (p != 0) { | |
920 | pi_disconnect(pi); | |
921 | printk("%s: Phase error on write: %d \n", | |
922 | tape->name, p); | |
923 | return -EIO; | |
924 | } | |
925 | ||
926 | while (n > 0) { | |
927 | k = n; | |
928 | if (k > PT_BUFSIZE) | |
929 | k = PT_BUFSIZE; | |
930 | b = k; | |
931 | if (b > count) | |
932 | b = count; | |
933 | if (copy_from_user(tape->bufptr, buf + t, b)) { | |
934 | pi_disconnect(pi); | |
935 | return -EFAULT; | |
936 | } | |
937 | pi_write_block(pi, tape->bufptr, k); | |
938 | t += b; | |
939 | count -= b; | |
940 | n -= k; | |
941 | } | |
942 | ||
943 | } | |
944 | pi_disconnect(pi); | |
945 | if (tape->flags & PT_EOF) | |
946 | break; | |
947 | } | |
948 | ||
949 | return t; | |
950 | } | |
951 | ||
952 | static int __init pt_init(void) | |
953 | { | |
829d5f68 AM |
954 | int unit; |
955 | int err; | |
1da177e4 LT |
956 | |
957 | if (disable) { | |
8bca98ca | 958 | err = -EINVAL; |
1da177e4 LT |
959 | goto out; |
960 | } | |
961 | ||
962 | if (pt_detect()) { | |
8bca98ca | 963 | err = -ENODEV; |
1da177e4 LT |
964 | goto out; |
965 | } | |
966 | ||
829d5f68 AM |
967 | err = register_chrdev(major, name, &pt_fops); |
968 | if (err < 0) { | |
1da177e4 LT |
969 | printk("pt_init: unable to get major number %d\n", major); |
970 | for (unit = 0; unit < PT_UNITS; unit++) | |
971 | if (pt[unit].present) | |
972 | pi_release(pt[unit].pi); | |
1da177e4 LT |
973 | goto out; |
974 | } | |
829d5f68 | 975 | major = err; |
deb36970 | 976 | pt_class = class_create(THIS_MODULE, "pt"); |
1da177e4 LT |
977 | if (IS_ERR(pt_class)) { |
978 | err = PTR_ERR(pt_class); | |
979 | goto out_chrdev; | |
980 | } | |
981 | ||
1da177e4 LT |
982 | for (unit = 0; unit < PT_UNITS; unit++) |
983 | if (pt[unit].present) { | |
1ff9f542 GKH |
984 | device_create(pt_class, NULL, MKDEV(major, unit), NULL, |
985 | "pt%d", unit); | |
986 | device_create(pt_class, NULL, MKDEV(major, unit + 128), | |
987 | NULL, "pt%dn", unit); | |
1da177e4 LT |
988 | } |
989 | goto out; | |
990 | ||
1da177e4 LT |
991 | out_chrdev: |
992 | unregister_chrdev(major, "pt"); | |
993 | out: | |
994 | return err; | |
995 | } | |
996 | ||
997 | static void __exit pt_exit(void) | |
998 | { | |
999 | int unit; | |
1000 | for (unit = 0; unit < PT_UNITS; unit++) | |
1001 | if (pt[unit].present) { | |
aa275826 TJ |
1002 | device_destroy(pt_class, MKDEV(major, unit)); |
1003 | device_destroy(pt_class, MKDEV(major, unit + 128)); | |
1da177e4 | 1004 | } |
deb36970 | 1005 | class_destroy(pt_class); |
1da177e4 LT |
1006 | unregister_chrdev(major, name); |
1007 | for (unit = 0; unit < PT_UNITS; unit++) | |
1008 | if (pt[unit].present) | |
1009 | pi_release(pt[unit].pi); | |
1010 | } | |
1011 | ||
1012 | MODULE_LICENSE("GPL"); | |
1013 | module_init(pt_init) | |
1014 | module_exit(pt_exit) |