Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | pg.c (c) 1998 Grant R. Guenther <grant@torque.net> | |
3 | Under the terms of the GNU General Public License. | |
4 | ||
5 | The pg driver provides a simple character device interface for | |
6 | sending ATAPI commands to a device. With the exception of the | |
7 | ATAPI reset operation, all operations are performed by a pair | |
8 | of read and write operations to the appropriate /dev/pgN device. | |
9 | A write operation delivers a command and any outbound data in | |
10 | a single buffer. Normally, the write will succeed unless the | |
11 | device is offline or malfunctioning, or there is already another | |
12 | command pending. If the write succeeds, it should be followed | |
13 | immediately by a read operation, to obtain any returned data and | |
14 | status information. A read will fail if there is no operation | |
15 | in progress. | |
16 | ||
17 | As a special case, the device can be reset with a write operation, | |
18 | and in this case, no following read is expected, or permitted. | |
19 | ||
20 | There are no ioctl() operations. Any single operation | |
21 | may transfer at most PG_MAX_DATA bytes. Note that the driver must | |
22 | copy the data through an internal buffer. In keeping with all | |
23 | current ATAPI devices, command packets are assumed to be exactly | |
24 | 12 bytes in length. | |
25 | ||
26 | To permit future changes to this interface, the headers in the | |
27 | read and write buffers contain a single character "magic" flag. | |
28 | Currently this flag must be the character "P". | |
29 | ||
30 | By default, the driver will autoprobe for a single parallel | |
31 | port ATAPI device, but if their individual parameters are | |
32 | specified, the driver can handle up to 4 devices. | |
33 | ||
34 | To use this device, you must have the following device | |
35 | special files defined: | |
36 | ||
37 | /dev/pg0 c 97 0 | |
38 | /dev/pg1 c 97 1 | |
39 | /dev/pg2 c 97 2 | |
40 | /dev/pg3 c 97 3 | |
41 | ||
42 | (You'll need to change the 97 to something else if you use | |
43 | the 'major' parameter to install the driver on a different | |
44 | major number.) | |
45 | ||
46 | The behaviour of the pg driver can be altered by setting | |
47 | some parameters from the insmod command line. The following | |
48 | parameters are adjustable: | |
49 | ||
50 | drive0 These four arguments can be arrays of | |
51 | drive1 1-6 integers as follows: | |
52 | drive2 | |
53 | drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly> | |
54 | ||
55 | Where, | |
56 | ||
57 | <prt> is the base of the parallel port address for | |
58 | the corresponding drive. (required) | |
59 | ||
60 | <pro> is the protocol number for the adapter that | |
61 | supports this drive. These numbers are | |
62 | logged by 'paride' when the protocol modules | |
63 | are initialised. (0 if not given) | |
64 | ||
65 | <uni> for those adapters that support chained | |
66 | devices, this is the unit selector for the | |
67 | chain of devices on the given port. It should | |
68 | be zero for devices that don't support chaining. | |
69 | (0 if not given) | |
70 | ||
71 | <mod> this can be -1 to choose the best mode, or one | |
72 | of the mode numbers supported by the adapter. | |
73 | (-1 if not given) | |
74 | ||
75 | <slv> ATAPI devices can be jumpered to master or slave. | |
76 | Set this to 0 to choose the master drive, 1 to | |
77 | choose the slave, -1 (the default) to choose the | |
78 | first drive found. | |
79 | ||
80 | <dly> some parallel ports require the driver to | |
81 | go more slowly. -1 sets a default value that | |
82 | should work with the chosen protocol. Otherwise, | |
83 | set this to a small integer, the larger it is | |
84 | the slower the port i/o. In some cases, setting | |
85 | this to zero will speed up the device. (default -1) | |
86 | ||
87 | major You may use this parameter to overide the | |
88 | default major number (97) that this driver | |
89 | will use. Be sure to change the device | |
90 | name as well. | |
91 | ||
92 | name This parameter is a character string that | |
93 | contains the name the kernel will use for this | |
94 | device (in /proc output, for instance). | |
95 | (default "pg"). | |
96 | ||
97 | verbose This parameter controls the amount of logging | |
98 | that is done by the driver. Set it to 0 for | |
99 | quiet operation, to 1 to enable progress | |
100 | messages while the driver probes for devices, | |
101 | or to 2 for full debug logging. (default 0) | |
102 | ||
103 | If this driver is built into the kernel, you can use | |
104 | the following command line parameters, with the same values | |
105 | as the corresponding module parameters listed above: | |
106 | ||
107 | pg.drive0 | |
108 | pg.drive1 | |
109 | pg.drive2 | |
110 | pg.drive3 | |
111 | ||
112 | In addition, you can use the parameter pg.disable to disable | |
113 | the driver entirely. | |
114 | ||
115 | */ | |
116 | ||
117 | /* Changes: | |
118 | ||
119 | 1.01 GRG 1998.06.16 Bug fixes | |
120 | 1.02 GRG 1998.09.24 Added jumbo support | |
121 | ||
122 | */ | |
123 | ||
124 | #define PG_VERSION "1.02" | |
125 | #define PG_MAJOR 97 | |
126 | #define PG_NAME "pg" | |
127 | #define PG_UNITS 4 | |
128 | ||
129 | #ifndef PI_PG | |
130 | #define PI_PG 4 | |
131 | #endif | |
132 | ||
133 | /* Here are things one can override from the insmod command. | |
134 | Most are autoprobed by paride unless set here. Verbose is 0 | |
135 | by default. | |
136 | ||
137 | */ | |
138 | ||
139 | static int verbose = 0; | |
140 | static int major = PG_MAJOR; | |
141 | static char *name = PG_NAME; | |
142 | static int disable = 0; | |
143 | ||
144 | static int drive0[6] = { 0, 0, 0, -1, -1, -1 }; | |
145 | static int drive1[6] = { 0, 0, 0, -1, -1, -1 }; | |
146 | static int drive2[6] = { 0, 0, 0, -1, -1, -1 }; | |
147 | static int drive3[6] = { 0, 0, 0, -1, -1, -1 }; | |
148 | ||
149 | static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3}; | |
150 | static int pg_drive_count; | |
151 | ||
152 | enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY}; | |
153 | ||
154 | /* end of parameters */ | |
155 | ||
156 | #include <linux/module.h> | |
157 | #include <linux/init.h> | |
158 | #include <linux/fs.h> | |
1da177e4 LT |
159 | #include <linux/delay.h> |
160 | #include <linux/slab.h> | |
161 | #include <linux/mtio.h> | |
162 | #include <linux/pg.h> | |
163 | #include <linux/device.h> | |
4e57b681 | 164 | #include <linux/sched.h> /* current, TASK_* */ |
ea2959a2 | 165 | #include <linux/smp_lock.h> |
4e57b681 | 166 | #include <linux/jiffies.h> |
1da177e4 LT |
167 | |
168 | #include <asm/uaccess.h> | |
169 | ||
170 | module_param(verbose, bool, 0644); | |
171 | module_param(major, int, 0); | |
172 | module_param(name, charp, 0); | |
173 | module_param_array(drive0, int, NULL, 0); | |
174 | module_param_array(drive1, int, NULL, 0); | |
175 | module_param_array(drive2, int, NULL, 0); | |
176 | module_param_array(drive3, int, NULL, 0); | |
177 | ||
178 | #include "paride.h" | |
179 | ||
180 | #define PG_SPIN_DEL 50 /* spin delay in micro-seconds */ | |
181 | #define PG_SPIN 200 | |
182 | #define PG_TMO HZ | |
183 | #define PG_RESET_TMO 10*HZ | |
184 | ||
185 | #define STAT_ERR 0x01 | |
186 | #define STAT_INDEX 0x02 | |
187 | #define STAT_ECC 0x04 | |
188 | #define STAT_DRQ 0x08 | |
189 | #define STAT_SEEK 0x10 | |
190 | #define STAT_WRERR 0x20 | |
191 | #define STAT_READY 0x40 | |
192 | #define STAT_BUSY 0x80 | |
193 | ||
194 | #define ATAPI_IDENTIFY 0x12 | |
195 | ||
196 | static int pg_open(struct inode *inode, struct file *file); | |
197 | static int pg_release(struct inode *inode, struct file *file); | |
198 | static ssize_t pg_read(struct file *filp, char __user *buf, | |
199 | size_t count, loff_t * ppos); | |
200 | static ssize_t pg_write(struct file *filp, const char __user *buf, | |
201 | size_t count, loff_t * ppos); | |
202 | static int pg_detect(void); | |
203 | ||
204 | #define PG_NAMELEN 8 | |
205 | ||
206 | struct pg { | |
207 | struct pi_adapter pia; /* interface to paride layer */ | |
208 | struct pi_adapter *pi; | |
209 | int busy; /* write done, read expected */ | |
210 | int start; /* jiffies at command start */ | |
211 | int dlen; /* transfer size requested */ | |
212 | unsigned long timeout; /* timeout requested */ | |
213 | int status; /* last sense key */ | |
214 | int drive; /* drive */ | |
215 | unsigned long access; /* count of active opens ... */ | |
216 | int present; /* device present ? */ | |
217 | char *bufptr; | |
218 | char name[PG_NAMELEN]; /* pg0, pg1, ... */ | |
219 | }; | |
220 | ||
221 | static struct pg devices[PG_UNITS]; | |
222 | ||
223 | static int pg_identify(struct pg *dev, int log); | |
224 | ||
225 | static char pg_scratch[512]; /* scratch block buffer */ | |
226 | ||
deb36970 | 227 | static struct class *pg_class; |
1da177e4 LT |
228 | |
229 | /* kernel glue structures */ | |
230 | ||
2b8693c0 | 231 | static const struct file_operations pg_fops = { |
1da177e4 LT |
232 | .owner = THIS_MODULE, |
233 | .read = pg_read, | |
234 | .write = pg_write, | |
235 | .open = pg_open, | |
236 | .release = pg_release, | |
6038f373 | 237 | .llseek = noop_llseek, |
1da177e4 LT |
238 | }; |
239 | ||
240 | static void pg_init_units(void) | |
241 | { | |
242 | int unit; | |
243 | ||
244 | pg_drive_count = 0; | |
245 | for (unit = 0; unit < PG_UNITS; unit++) { | |
246 | int *parm = *drives[unit]; | |
247 | struct pg *dev = &devices[unit]; | |
248 | dev->pi = &dev->pia; | |
249 | clear_bit(0, &dev->access); | |
250 | dev->busy = 0; | |
251 | dev->present = 0; | |
252 | dev->bufptr = NULL; | |
253 | dev->drive = parm[D_SLV]; | |
254 | snprintf(dev->name, PG_NAMELEN, "%s%c", name, 'a'+unit); | |
255 | if (parm[D_PRT]) | |
256 | pg_drive_count++; | |
257 | } | |
258 | } | |
259 | ||
260 | static inline int status_reg(struct pg *dev) | |
261 | { | |
262 | return pi_read_regr(dev->pi, 1, 6); | |
263 | } | |
264 | ||
265 | static inline int read_reg(struct pg *dev, int reg) | |
266 | { | |
267 | return pi_read_regr(dev->pi, 0, reg); | |
268 | } | |
269 | ||
270 | static inline void write_reg(struct pg *dev, int reg, int val) | |
271 | { | |
272 | pi_write_regr(dev->pi, 0, reg, val); | |
273 | } | |
274 | ||
275 | static inline u8 DRIVE(struct pg *dev) | |
276 | { | |
277 | return 0xa0+0x10*dev->drive; | |
278 | } | |
279 | ||
280 | static void pg_sleep(int cs) | |
281 | { | |
86e84862 | 282 | schedule_timeout_interruptible(cs); |
1da177e4 LT |
283 | } |
284 | ||
285 | static int pg_wait(struct pg *dev, int go, int stop, unsigned long tmo, char *msg) | |
286 | { | |
287 | int j, r, e, s, p, to; | |
288 | ||
289 | dev->status = 0; | |
290 | ||
291 | j = 0; | |
292 | while ((((r = status_reg(dev)) & go) || (stop && (!(r & stop)))) | |
293 | && time_before(jiffies, tmo)) { | |
294 | if (j++ < PG_SPIN) | |
295 | udelay(PG_SPIN_DEL); | |
296 | else | |
297 | pg_sleep(1); | |
298 | } | |
299 | ||
300 | to = time_after_eq(jiffies, tmo); | |
301 | ||
302 | if ((r & (STAT_ERR & stop)) || to) { | |
303 | s = read_reg(dev, 7); | |
304 | e = read_reg(dev, 1); | |
305 | p = read_reg(dev, 2); | |
306 | if (verbose > 1) | |
307 | printk("%s: %s: stat=0x%x err=0x%x phase=%d%s\n", | |
308 | dev->name, msg, s, e, p, to ? " timeout" : ""); | |
309 | if (to) | |
310 | e |= 0x100; | |
311 | dev->status = (e >> 4) & 0xff; | |
312 | return -1; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int pg_command(struct pg *dev, char *cmd, int dlen, unsigned long tmo) | |
318 | { | |
319 | int k; | |
320 | ||
321 | pi_connect(dev->pi); | |
322 | ||
323 | write_reg(dev, 6, DRIVE(dev)); | |
324 | ||
325 | if (pg_wait(dev, STAT_BUSY | STAT_DRQ, 0, tmo, "before command")) | |
326 | goto fail; | |
327 | ||
328 | write_reg(dev, 4, dlen % 256); | |
329 | write_reg(dev, 5, dlen / 256); | |
330 | write_reg(dev, 7, 0xa0); /* ATAPI packet command */ | |
331 | ||
332 | if (pg_wait(dev, STAT_BUSY, STAT_DRQ, tmo, "command DRQ")) | |
333 | goto fail; | |
334 | ||
335 | if (read_reg(dev, 2) != 1) { | |
336 | printk("%s: command phase error\n", dev->name); | |
337 | goto fail; | |
338 | } | |
339 | ||
340 | pi_write_block(dev->pi, cmd, 12); | |
341 | ||
342 | if (verbose > 1) { | |
343 | printk("%s: Command sent, dlen=%d packet= ", dev->name, dlen); | |
344 | for (k = 0; k < 12; k++) | |
345 | printk("%02x ", cmd[k] & 0xff); | |
346 | printk("\n"); | |
347 | } | |
348 | return 0; | |
349 | fail: | |
350 | pi_disconnect(dev->pi); | |
351 | return -1; | |
352 | } | |
353 | ||
354 | static int pg_completion(struct pg *dev, char *buf, unsigned long tmo) | |
355 | { | |
356 | int r, d, n, p; | |
357 | ||
358 | r = pg_wait(dev, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
359 | tmo, "completion"); | |
360 | ||
361 | dev->dlen = 0; | |
362 | ||
363 | while (read_reg(dev, 7) & STAT_DRQ) { | |
364 | d = (read_reg(dev, 4) + 256 * read_reg(dev, 5)); | |
365 | n = ((d + 3) & 0xfffc); | |
366 | p = read_reg(dev, 2) & 3; | |
367 | if (p == 0) | |
368 | pi_write_block(dev->pi, buf, n); | |
369 | if (p == 2) | |
370 | pi_read_block(dev->pi, buf, n); | |
371 | if (verbose > 1) | |
372 | printk("%s: %s %d bytes\n", dev->name, | |
373 | p ? "Read" : "Write", n); | |
374 | dev->dlen += (1 - p) * d; | |
375 | buf += d; | |
376 | r = pg_wait(dev, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
377 | tmo, "completion"); | |
378 | } | |
379 | ||
380 | pi_disconnect(dev->pi); | |
381 | ||
382 | return r; | |
383 | } | |
384 | ||
385 | static int pg_reset(struct pg *dev) | |
386 | { | |
387 | int i, k, err; | |
388 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
389 | int got[5]; | |
390 | ||
391 | pi_connect(dev->pi); | |
392 | write_reg(dev, 6, DRIVE(dev)); | |
393 | write_reg(dev, 7, 8); | |
394 | ||
395 | pg_sleep(20 * HZ / 1000); | |
396 | ||
397 | k = 0; | |
398 | while ((k++ < PG_RESET_TMO) && (status_reg(dev) & STAT_BUSY)) | |
399 | pg_sleep(1); | |
400 | ||
401 | for (i = 0; i < 5; i++) | |
402 | got[i] = read_reg(dev, i + 1); | |
403 | ||
404 | err = memcmp(expect, got, sizeof(got)) ? -1 : 0; | |
405 | ||
406 | if (verbose) { | |
407 | printk("%s: Reset (%d) signature = ", dev->name, k); | |
408 | for (i = 0; i < 5; i++) | |
409 | printk("%3x", got[i]); | |
410 | if (err) | |
411 | printk(" (incorrect)"); | |
412 | printk("\n"); | |
413 | } | |
414 | ||
415 | pi_disconnect(dev->pi); | |
416 | return err; | |
417 | } | |
418 | ||
419 | static void xs(char *buf, char *targ, int len) | |
420 | { | |
421 | char l = '\0'; | |
422 | int k; | |
423 | ||
424 | for (k = 0; k < len; k++) { | |
425 | char c = *buf++; | |
c8cbec6b | 426 | if (c != ' ' && c != l) |
1da177e4 LT |
427 | l = *targ++ = c; |
428 | } | |
429 | if (l == ' ') | |
430 | targ--; | |
431 | *targ = '\0'; | |
432 | } | |
433 | ||
434 | static int pg_identify(struct pg *dev, int log) | |
435 | { | |
436 | int s; | |
437 | char *ms[2] = { "master", "slave" }; | |
438 | char mf[10], id[18]; | |
439 | char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
440 | char buf[36]; | |
441 | ||
442 | s = pg_command(dev, id_cmd, 36, jiffies + PG_TMO); | |
443 | if (s) | |
444 | return -1; | |
445 | s = pg_completion(dev, buf, jiffies + PG_TMO); | |
446 | if (s) | |
447 | return -1; | |
448 | ||
449 | if (log) { | |
450 | xs(buf + 8, mf, 8); | |
451 | xs(buf + 16, id, 16); | |
452 | printk("%s: %s %s, %s\n", dev->name, mf, id, ms[dev->drive]); | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | /* | |
459 | * returns 0, with id set if drive is detected | |
460 | * -1, if drive detection failed | |
461 | */ | |
462 | static int pg_probe(struct pg *dev) | |
463 | { | |
464 | if (dev->drive == -1) { | |
465 | for (dev->drive = 0; dev->drive <= 1; dev->drive++) | |
466 | if (!pg_reset(dev)) | |
467 | return pg_identify(dev, 1); | |
468 | } else { | |
469 | if (!pg_reset(dev)) | |
470 | return pg_identify(dev, 1); | |
471 | } | |
472 | return -1; | |
473 | } | |
474 | ||
475 | static int pg_detect(void) | |
476 | { | |
477 | struct pg *dev = &devices[0]; | |
478 | int k, unit; | |
479 | ||
480 | printk("%s: %s version %s, major %d\n", name, name, PG_VERSION, major); | |
481 | ||
482 | k = 0; | |
483 | if (pg_drive_count == 0) { | |
484 | if (pi_init(dev->pi, 1, -1, -1, -1, -1, -1, pg_scratch, | |
485 | PI_PG, verbose, dev->name)) { | |
486 | if (!pg_probe(dev)) { | |
487 | dev->present = 1; | |
488 | k++; | |
489 | } else | |
490 | pi_release(dev->pi); | |
491 | } | |
492 | ||
493 | } else | |
494 | for (unit = 0; unit < PG_UNITS; unit++, dev++) { | |
495 | int *parm = *drives[unit]; | |
496 | if (!parm[D_PRT]) | |
497 | continue; | |
498 | if (pi_init(dev->pi, 0, parm[D_PRT], parm[D_MOD], | |
499 | parm[D_UNI], parm[D_PRO], parm[D_DLY], | |
500 | pg_scratch, PI_PG, verbose, dev->name)) { | |
501 | if (!pg_probe(dev)) { | |
502 | dev->present = 1; | |
503 | k++; | |
504 | } else | |
505 | pi_release(dev->pi); | |
506 | } | |
507 | } | |
508 | ||
509 | if (k) | |
510 | return 0; | |
511 | ||
512 | printk("%s: No ATAPI device detected\n", name); | |
513 | return -1; | |
514 | } | |
515 | ||
516 | static int pg_open(struct inode *inode, struct file *file) | |
517 | { | |
518 | int unit = iminor(inode) & 0x7f; | |
519 | struct pg *dev = &devices[unit]; | |
ea2959a2 | 520 | int ret = 0; |
1da177e4 | 521 | |
ea2959a2 JC |
522 | lock_kernel(); |
523 | if ((unit >= PG_UNITS) || (!dev->present)) { | |
524 | ret = -ENODEV; | |
525 | goto out; | |
526 | } | |
1da177e4 | 527 | |
ea2959a2 JC |
528 | if (test_and_set_bit(0, &dev->access)) { |
529 | ret = -EBUSY; | |
530 | goto out; | |
531 | } | |
1da177e4 LT |
532 | |
533 | if (dev->busy) { | |
534 | pg_reset(dev); | |
535 | dev->busy = 0; | |
536 | } | |
537 | ||
538 | pg_identify(dev, (verbose > 1)); | |
539 | ||
540 | dev->bufptr = kmalloc(PG_MAX_DATA, GFP_KERNEL); | |
541 | if (dev->bufptr == NULL) { | |
542 | clear_bit(0, &dev->access); | |
543 | printk("%s: buffer allocation failed\n", dev->name); | |
ea2959a2 JC |
544 | ret = -ENOMEM; |
545 | goto out; | |
1da177e4 LT |
546 | } |
547 | ||
548 | file->private_data = dev; | |
549 | ||
ea2959a2 JC |
550 | out: |
551 | unlock_kernel(); | |
552 | return ret; | |
1da177e4 LT |
553 | } |
554 | ||
555 | static int pg_release(struct inode *inode, struct file *file) | |
556 | { | |
557 | struct pg *dev = file->private_data; | |
558 | ||
559 | kfree(dev->bufptr); | |
560 | dev->bufptr = NULL; | |
561 | clear_bit(0, &dev->access); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static ssize_t pg_write(struct file *filp, const char __user *buf, size_t count, loff_t *ppos) | |
567 | { | |
568 | struct pg *dev = filp->private_data; | |
569 | struct pg_write_hdr hdr; | |
570 | int hs = sizeof (hdr); | |
571 | ||
572 | if (dev->busy) | |
573 | return -EBUSY; | |
574 | if (count < hs) | |
575 | return -EINVAL; | |
576 | ||
577 | if (copy_from_user(&hdr, buf, hs)) | |
578 | return -EFAULT; | |
579 | ||
580 | if (hdr.magic != PG_MAGIC) | |
581 | return -EINVAL; | |
582 | if (hdr.dlen > PG_MAX_DATA) | |
583 | return -EINVAL; | |
584 | if ((count - hs) > PG_MAX_DATA) | |
585 | return -EINVAL; | |
586 | ||
587 | if (hdr.func == PG_RESET) { | |
588 | if (count != hs) | |
589 | return -EINVAL; | |
590 | if (pg_reset(dev)) | |
591 | return -EIO; | |
592 | return count; | |
593 | } | |
594 | ||
595 | if (hdr.func != PG_COMMAND) | |
596 | return -EINVAL; | |
597 | ||
598 | dev->start = jiffies; | |
599 | dev->timeout = hdr.timeout * HZ + HZ / 2 + jiffies; | |
600 | ||
601 | if (pg_command(dev, hdr.packet, hdr.dlen, jiffies + PG_TMO)) { | |
602 | if (dev->status & 0x10) | |
603 | return -ETIME; | |
604 | return -EIO; | |
605 | } | |
606 | ||
607 | dev->busy = 1; | |
608 | ||
609 | if (copy_from_user(dev->bufptr, buf + hs, count - hs)) | |
610 | return -EFAULT; | |
611 | return count; | |
612 | } | |
613 | ||
614 | static ssize_t pg_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos) | |
615 | { | |
616 | struct pg *dev = filp->private_data; | |
617 | struct pg_read_hdr hdr; | |
618 | int hs = sizeof (hdr); | |
619 | int copy; | |
620 | ||
621 | if (!dev->busy) | |
622 | return -EINVAL; | |
623 | if (count < hs) | |
624 | return -EINVAL; | |
625 | ||
626 | dev->busy = 0; | |
627 | ||
628 | if (pg_completion(dev, dev->bufptr, dev->timeout)) | |
629 | if (dev->status & 0x10) | |
630 | return -ETIME; | |
631 | ||
632 | hdr.magic = PG_MAGIC; | |
633 | hdr.dlen = dev->dlen; | |
634 | copy = 0; | |
635 | ||
636 | if (hdr.dlen < 0) { | |
637 | hdr.dlen = -1 * hdr.dlen; | |
638 | copy = hdr.dlen; | |
639 | if (copy > (count - hs)) | |
640 | copy = count - hs; | |
641 | } | |
642 | ||
643 | hdr.duration = (jiffies - dev->start + HZ / 2) / HZ; | |
644 | hdr.scsi = dev->status & 0x0f; | |
645 | ||
646 | if (copy_to_user(buf, &hdr, hs)) | |
647 | return -EFAULT; | |
648 | if (copy > 0) | |
649 | if (copy_to_user(buf + hs, dev->bufptr, copy)) | |
650 | return -EFAULT; | |
651 | return copy + hs; | |
652 | } | |
653 | ||
654 | static int __init pg_init(void) | |
655 | { | |
8637980b AM |
656 | int unit; |
657 | int err; | |
1da177e4 LT |
658 | |
659 | if (disable){ | |
8bca98ca | 660 | err = -EINVAL; |
1da177e4 LT |
661 | goto out; |
662 | } | |
663 | ||
664 | pg_init_units(); | |
665 | ||
666 | if (pg_detect()) { | |
8bca98ca | 667 | err = -ENODEV; |
1da177e4 LT |
668 | goto out; |
669 | } | |
670 | ||
8637980b AM |
671 | err = register_chrdev(major, name, &pg_fops); |
672 | if (err < 0) { | |
1da177e4 LT |
673 | printk("pg_init: unable to get major number %d\n", major); |
674 | for (unit = 0; unit < PG_UNITS; unit++) { | |
675 | struct pg *dev = &devices[unit]; | |
676 | if (dev->present) | |
677 | pi_release(dev->pi); | |
678 | } | |
1da177e4 LT |
679 | goto out; |
680 | } | |
8637980b | 681 | major = err; /* In case the user specified `major=0' (dynamic) */ |
deb36970 | 682 | pg_class = class_create(THIS_MODULE, "pg"); |
1da177e4 LT |
683 | if (IS_ERR(pg_class)) { |
684 | err = PTR_ERR(pg_class); | |
685 | goto out_chrdev; | |
686 | } | |
1da177e4 LT |
687 | for (unit = 0; unit < PG_UNITS; unit++) { |
688 | struct pg *dev = &devices[unit]; | |
7c69ef79 | 689 | if (dev->present) |
1ff9f542 GKH |
690 | device_create(pg_class, NULL, MKDEV(major, unit), NULL, |
691 | "pg%u", unit); | |
1da177e4 LT |
692 | } |
693 | err = 0; | |
694 | goto out; | |
695 | ||
1da177e4 LT |
696 | out_chrdev: |
697 | unregister_chrdev(major, "pg"); | |
698 | out: | |
699 | return err; | |
700 | } | |
701 | ||
702 | static void __exit pg_exit(void) | |
703 | { | |
704 | int unit; | |
705 | ||
706 | for (unit = 0; unit < PG_UNITS; unit++) { | |
707 | struct pg *dev = &devices[unit]; | |
8ab5e4c1 | 708 | if (dev->present) |
aa275826 | 709 | device_destroy(pg_class, MKDEV(major, unit)); |
1da177e4 | 710 | } |
deb36970 | 711 | class_destroy(pg_class); |
1da177e4 LT |
712 | unregister_chrdev(major, name); |
713 | ||
714 | for (unit = 0; unit < PG_UNITS; unit++) { | |
715 | struct pg *dev = &devices[unit]; | |
716 | if (dev->present) | |
717 | pi_release(dev->pi); | |
718 | } | |
719 | } | |
720 | ||
721 | MODULE_LICENSE("GPL"); | |
722 | module_init(pg_init) | |
723 | module_exit(pg_exit) |