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rcv reorder queue bugfix
[cor_2_6_31.git] / drivers / scsi / ch.c
blob7b1633a8c15aaac9da83c97255562c050a819112
1 /*
2 * SCSI Media Changer device driver for Linux 2.6
3 *
4 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
5 *
6 */
7
8 #define VERSION "0.25"
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/fs.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/major.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/interrupt.h>
19 #include <linux/blkdev.h>
20 #include <linux/completion.h>
21 #include <linux/compat.h>
22 #include <linux/chio.h> /* here are all the ioctls */
23 #include <linux/mutex.h>
24 #include <linux/idr.h>
25 #include <linux/smp_lock.h>
26
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_cmnd.h>
29 #include <scsi/scsi_driver.h>
30 #include <scsi/scsi_ioctl.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_dbg.h>
35
36 #define CH_DT_MAX 16
37 #define CH_TYPES 8
38 #define CH_MAX_DEVS 128
39
40 MODULE_DESCRIPTION("device driver for scsi media changer devices");
41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42 MODULE_LICENSE("GPL");
43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
45
46 static int init = 1;
47 module_param(init, int, 0444);
48 MODULE_PARM_DESC(init, \
49 "initialize element status on driver load (default: on)");
50
51 static int timeout_move = 300;
52 module_param(timeout_move, int, 0644);
53 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
54 "(default: 300 seconds)");
55
56 static int timeout_init = 3600;
57 module_param(timeout_init, int, 0644);
58 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
59 "(default: 3600 seconds)");
60
61 static int verbose = 1;
62 module_param(verbose, int, 0644);
63 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
64
65 static int debug = 0;
66 module_param(debug, int, 0644);
67 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
68 "detailed sense codes on scsi errors (default: off)");
69
70 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
71 static int dt_lun[CH_DT_MAX];
72 module_param_array(dt_id, int, NULL, 0444);
73 module_param_array(dt_lun, int, NULL, 0444);
74
75 /* tell the driver about vendor-specific slots */
76 static int vendor_firsts[CH_TYPES-4];
77 static int vendor_counts[CH_TYPES-4];
78 module_param_array(vendor_firsts, int, NULL, 0444);
79 module_param_array(vendor_counts, int, NULL, 0444);
80
81 static const char * vendor_labels[CH_TYPES-4] = {
82 "v0", "v1", "v2", "v3"
83 };
84 // module_param_string_array(vendor_labels, NULL, 0444);
85
86 #define dprintk(fmt, arg...) if (debug) \
87 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
88 #define vprintk(fmt, arg...) if (verbose) \
89 printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
90
91 /* ------------------------------------------------------------------- */
92
93 #define MAX_RETRIES 1
94
95 static struct class * ch_sysfs_class;
96
97 typedef struct {
98 struct list_head list;
99 int minor;
100 char name[8];
101 struct scsi_device *device;
102 struct scsi_device **dt; /* ptrs to data transfer elements */
103 u_int firsts[CH_TYPES];
104 u_int counts[CH_TYPES];
105 u_int unit_attention;
106 u_int voltags;
107 struct mutex lock;
108 } scsi_changer;
109
110 static DEFINE_IDR(ch_index_idr);
111 static DEFINE_SPINLOCK(ch_index_lock);
112
113 static const struct {
114 unsigned char sense;
115 unsigned char asc;
116 unsigned char ascq;
117 int errno;
118 } ch_err[] = {
119 /* Just filled in what looks right. Hav'nt checked any standard paper for
120 these errno assignments, so they may be wrong... */
121 {
122 .sense = ILLEGAL_REQUEST,
123 .asc = 0x21,
124 .ascq = 0x01,
125 .errno = EBADSLT, /* Invalid element address */
126 },{
127 .sense = ILLEGAL_REQUEST,
128 .asc = 0x28,
129 .ascq = 0x01,
130 .errno = EBADE, /* Import or export element accessed */
131 },{
132 .sense = ILLEGAL_REQUEST,
133 .asc = 0x3B,
134 .ascq = 0x0D,
135 .errno = EXFULL, /* Medium destination element full */
136 },{
137 .sense = ILLEGAL_REQUEST,
138 .asc = 0x3B,
139 .ascq = 0x0E,
140 .errno = EBADE, /* Medium source element empty */
141 },{
142 .sense = ILLEGAL_REQUEST,
143 .asc = 0x20,
144 .ascq = 0x00,
145 .errno = EBADRQC, /* Invalid command operation code */
146 },{
147 /* end of list */
148 }
149 };
150
151 /* ------------------------------------------------------------------- */
152
153 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
154 {
155 int i,errno = 0;
156
157 /* Check to see if additional sense information is available */
158 if (scsi_sense_valid(sshdr) &&
159 sshdr->asc != 0) {
160 for (i = 0; ch_err[i].errno != 0; i++) {
161 if (ch_err[i].sense == sshdr->sense_key &&
162 ch_err[i].asc == sshdr->asc &&
163 ch_err[i].ascq == sshdr->ascq) {
164 errno = -ch_err[i].errno;
165 break;
166 }
167 }
168 }
169 if (errno == 0)
170 errno = -EIO;
171 return errno;
172 }
173
174 static int
175 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
176 void *buffer, unsigned buflength,
177 enum dma_data_direction direction)
178 {
179 int errno, retries = 0, timeout, result;
180 struct scsi_sense_hdr sshdr;
181
182 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
183 ? timeout_init : timeout_move;
184
185 retry:
186 errno = 0;
187 if (debug) {
188 dprintk("command: ");
189 __scsi_print_command(cmd);
190 }
191
192 result = scsi_execute_req(ch->device, cmd, direction, buffer,
193 buflength, &sshdr, timeout * HZ,
194 MAX_RETRIES, NULL);
195
196 dprintk("result: 0x%x\n",result);
197 if (driver_byte(result) & DRIVER_SENSE) {
198 if (debug)
199 scsi_print_sense_hdr(ch->name, &sshdr);
200 errno = ch_find_errno(&sshdr);
201
202 switch(sshdr.sense_key) {
203 case UNIT_ATTENTION:
204 ch->unit_attention = 1;
205 if (retries++ < 3)
206 goto retry;
207 break;
208 }
209 }
210 return errno;
211 }
212
213 /* ------------------------------------------------------------------------ */
214
215 static int
216 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
217 {
218 int i;
219
220 for (i = 0; i < CH_TYPES; i++) {
221 if (elem >= ch->firsts[i] &&
222 elem < ch->firsts[i] +
223 ch->counts[i])
224 return i+1;
225 }
226 return 0;
227 }
228
229 static int
230 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
231 {
232 u_char cmd[12];
233 u_char *buffer;
234 int result;
235
236 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
237 if(!buffer)
238 return -ENOMEM;
239
240 retry:
241 memset(cmd,0,sizeof(cmd));
242 cmd[0] = READ_ELEMENT_STATUS;
243 cmd[1] = (ch->device->lun << 5) |
244 (ch->voltags ? 0x10 : 0) |
245 ch_elem_to_typecode(ch,elem);
246 cmd[2] = (elem >> 8) & 0xff;
247 cmd[3] = elem & 0xff;
248 cmd[5] = 1;
249 cmd[9] = 255;
250 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
251 if (((buffer[16] << 8) | buffer[17]) != elem) {
252 dprintk("asked for element 0x%02x, got 0x%02x\n",
253 elem,(buffer[16] << 8) | buffer[17]);
254 kfree(buffer);
255 return -EIO;
256 }
257 memcpy(data,buffer+16,16);
258 } else {
259 if (ch->voltags) {
260 ch->voltags = 0;
261 vprintk("device has no volume tag support\n");
262 goto retry;
263 }
264 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
265 }
266 kfree(buffer);
267 return result;
268 }
269
270 static int
271 ch_init_elem(scsi_changer *ch)
272 {
273 int err;
274 u_char cmd[6];
275
276 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
277 memset(cmd,0,sizeof(cmd));
278 cmd[0] = INITIALIZE_ELEMENT_STATUS;
279 cmd[1] = ch->device->lun << 5;
280 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
281 vprintk("... finished\n");
282 return err;
283 }
284
285 static int
286 ch_readconfig(scsi_changer *ch)
287 {
288 u_char cmd[10], data[16];
289 u_char *buffer;
290 int result,id,lun,i;
291 u_int elem;
292
293 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
294 if (!buffer)
295 return -ENOMEM;
296
297 memset(cmd,0,sizeof(cmd));
298 cmd[0] = MODE_SENSE;
299 cmd[1] = ch->device->lun << 5;
300 cmd[2] = 0x1d;
301 cmd[4] = 255;
302 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
303 if (0 != result) {
304 cmd[1] |= (1<<3);
305 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
306 }
307 if (0 == result) {
308 ch->firsts[CHET_MT] =
309 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
310 ch->counts[CHET_MT] =
311 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
312 ch->firsts[CHET_ST] =
313 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
314 ch->counts[CHET_ST] =
315 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
316 ch->firsts[CHET_IE] =
317 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
318 ch->counts[CHET_IE] =
319 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
320 ch->firsts[CHET_DT] =
321 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
322 ch->counts[CHET_DT] =
323 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
324 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
325 ch->firsts[CHET_MT],
326 ch->counts[CHET_MT]);
327 vprintk("type #2 (st): 0x%x+%d [storage]\n",
328 ch->firsts[CHET_ST],
329 ch->counts[CHET_ST]);
330 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
331 ch->firsts[CHET_IE],
332 ch->counts[CHET_IE]);
333 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
334 ch->firsts[CHET_DT],
335 ch->counts[CHET_DT]);
336 } else {
337 vprintk("reading element address assigment page failed!\n");
338 }
339
340 /* vendor specific element types */
341 for (i = 0; i < 4; i++) {
342 if (0 == vendor_counts[i])
343 continue;
344 if (NULL == vendor_labels[i])
345 continue;
346 ch->firsts[CHET_V1+i] = vendor_firsts[i];
347 ch->counts[CHET_V1+i] = vendor_counts[i];
348 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
349 i+5,i+1,vendor_firsts[i],vendor_counts[i],
350 vendor_labels[i]);
351 }
352
353 /* look up the devices of the data transfer elements */
354 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
355 GFP_KERNEL);
356 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
357 id = -1;
358 lun = 0;
359 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
360 id = dt_id[elem];
361 lun = dt_lun[elem];
362 vprintk("dt 0x%x: [insmod option] ",
363 elem+ch->firsts[CHET_DT]);
364 } else if (0 != ch_read_element_status
365 (ch,elem+ch->firsts[CHET_DT],data)) {
366 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
367 elem+ch->firsts[CHET_DT]);
368 } else {
369 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
370 if (data[6] & 0x80) {
371 if (verbose)
372 printk("not this SCSI bus\n");
373 ch->dt[elem] = NULL;
374 } else if (0 == (data[6] & 0x30)) {
375 if (verbose)
376 printk("ID/LUN unknown\n");
377 ch->dt[elem] = NULL;
378 } else {
379 id = ch->device->id;
380 lun = 0;
381 if (data[6] & 0x20) id = data[7];
382 if (data[6] & 0x10) lun = data[6] & 7;
383 }
384 }
385 if (-1 != id) {
386 if (verbose)
387 printk("ID %i, LUN %i, ",id,lun);
388 ch->dt[elem] =
389 scsi_device_lookup(ch->device->host,
390 ch->device->channel,
391 id,lun);
392 if (!ch->dt[elem]) {
393 /* should not happen */
394 if (verbose)
395 printk("Huh? device not found!\n");
396 } else {
397 if (verbose)
398 printk("name: %8.8s %16.16s %4.4s\n",
399 ch->dt[elem]->vendor,
400 ch->dt[elem]->model,
401 ch->dt[elem]->rev);
402 }
403 }
404 }
405 ch->voltags = 1;
406 kfree(buffer);
407
408 return 0;
409 }
410
411 /* ------------------------------------------------------------------------ */
412
413 static int
414 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
415 {
416 u_char cmd[10];
417
418 dprintk("position: 0x%x\n",elem);
419 if (0 == trans)
420 trans = ch->firsts[CHET_MT];
421 memset(cmd,0,sizeof(cmd));
422 cmd[0] = POSITION_TO_ELEMENT;
423 cmd[1] = ch->device->lun << 5;
424 cmd[2] = (trans >> 8) & 0xff;
425 cmd[3] = trans & 0xff;
426 cmd[4] = (elem >> 8) & 0xff;
427 cmd[5] = elem & 0xff;
428 cmd[8] = rotate ? 1 : 0;
429 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
430 }
431
432 static int
433 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
434 {
435 u_char cmd[12];
436
437 dprintk("move: 0x%x => 0x%x\n",src,dest);
438 if (0 == trans)
439 trans = ch->firsts[CHET_MT];
440 memset(cmd,0,sizeof(cmd));
441 cmd[0] = MOVE_MEDIUM;
442 cmd[1] = ch->device->lun << 5;
443 cmd[2] = (trans >> 8) & 0xff;
444 cmd[3] = trans & 0xff;
445 cmd[4] = (src >> 8) & 0xff;
446 cmd[5] = src & 0xff;
447 cmd[6] = (dest >> 8) & 0xff;
448 cmd[7] = dest & 0xff;
449 cmd[10] = rotate ? 1 : 0;
450 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
451 }
452
453 static int
454 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
455 u_int dest1, u_int dest2, int rotate1, int rotate2)
456 {
457 u_char cmd[12];
458
459 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
460 src,dest1,dest2);
461 if (0 == trans)
462 trans = ch->firsts[CHET_MT];
463 memset(cmd,0,sizeof(cmd));
464 cmd[0] = EXCHANGE_MEDIUM;
465 cmd[1] = ch->device->lun << 5;
466 cmd[2] = (trans >> 8) & 0xff;
467 cmd[3] = trans & 0xff;
468 cmd[4] = (src >> 8) & 0xff;
469 cmd[5] = src & 0xff;
470 cmd[6] = (dest1 >> 8) & 0xff;
471 cmd[7] = dest1 & 0xff;
472 cmd[8] = (dest2 >> 8) & 0xff;
473 cmd[9] = dest2 & 0xff;
474 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
475
476 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
477 }
478
479 static void
480 ch_check_voltag(char *tag)
481 {
482 int i;
483
484 for (i = 0; i < 32; i++) {
485 /* restrict to ascii */
486 if (tag[i] >= 0x7f || tag[i] < 0x20)
487 tag[i] = ' ';
488 /* don't allow search wildcards */
489 if (tag[i] == '?' ||
490 tag[i] == '*')
491 tag[i] = ' ';
492 }
493 }
494
495 static int
496 ch_set_voltag(scsi_changer *ch, u_int elem,
497 int alternate, int clear, u_char *tag)
498 {
499 u_char cmd[12];
500 u_char *buffer;
501 int result;
502
503 buffer = kzalloc(512, GFP_KERNEL);
504 if (!buffer)
505 return -ENOMEM;
506
507 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
508 clear ? "clear" : "set",
509 alternate ? "alternate" : "primary",
510 elem, tag);
511 memset(cmd,0,sizeof(cmd));
512 cmd[0] = SEND_VOLUME_TAG;
513 cmd[1] = (ch->device->lun << 5) |
514 ch_elem_to_typecode(ch,elem);
515 cmd[2] = (elem >> 8) & 0xff;
516 cmd[3] = elem & 0xff;
517 cmd[5] = clear
518 ? (alternate ? 0x0d : 0x0c)
519 : (alternate ? 0x0b : 0x0a);
520
521 cmd[9] = 255;
522
523 memcpy(buffer,tag,32);
524 ch_check_voltag(buffer);
525
526 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
527 kfree(buffer);
528 return result;
529 }
530
531 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
532 {
533 int retval = 0;
534 u_char data[16];
535 unsigned int i;
536
537 mutex_lock(&ch->lock);
538 for (i = 0; i < ch->counts[type]; i++) {
539 if (0 != ch_read_element_status
540 (ch, ch->firsts[type]+i,data)) {
541 retval = -EIO;
542 break;
543 }
544 put_user(data[2], dest+i);
545 if (data[2] & CESTATUS_EXCEPT)
546 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
547 ch->firsts[type]+i,
548 (int)data[4],(int)data[5]);
549 retval = ch_read_element_status
550 (ch, ch->firsts[type]+i,data);
551 if (0 != retval)
552 break;
553 }
554 mutex_unlock(&ch->lock);
555 return retval;
556 }
557
558 /* ------------------------------------------------------------------------ */
559
560 static int
561 ch_release(struct inode *inode, struct file *file)
562 {
563 scsi_changer *ch = file->private_data;
564
565 scsi_device_put(ch->device);
566 file->private_data = NULL;
567 return 0;
568 }
569
570 static int
571 ch_open(struct inode *inode, struct file *file)
572 {
573 scsi_changer *ch;
574 int minor = iminor(inode);
575
576 lock_kernel();
577 spin_lock(&ch_index_lock);
578 ch = idr_find(&ch_index_idr, minor);
579
580 if (NULL == ch || scsi_device_get(ch->device)) {
581 spin_unlock(&ch_index_lock);
582 unlock_kernel();
583 return -ENXIO;
584 }
585 spin_unlock(&ch_index_lock);
586
587 file->private_data = ch;
588 unlock_kernel();
589 return 0;
590 }
591
592 static int
593 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
594 {
595 if (type >= CH_TYPES || unit >= ch->counts[type])
596 return -1;
597 return 0;
598 }
599
600 static long ch_ioctl(struct file *file,
601 unsigned int cmd, unsigned long arg)
602 {
603 scsi_changer *ch = file->private_data;
604 int retval;
605 void __user *argp = (void __user *)arg;
606
607 switch (cmd) {
608 case CHIOGPARAMS:
609 {
610 struct changer_params params;
611
612 params.cp_curpicker = 0;
613 params.cp_npickers = ch->counts[CHET_MT];
614 params.cp_nslots = ch->counts[CHET_ST];
615 params.cp_nportals = ch->counts[CHET_IE];
616 params.cp_ndrives = ch->counts[CHET_DT];
617
618 if (copy_to_user(argp, &params, sizeof(params)))
619 return -EFAULT;
620 return 0;
621 }
622 case CHIOGVPARAMS:
623 {
624 struct changer_vendor_params vparams;
625
626 memset(&vparams,0,sizeof(vparams));
627 if (ch->counts[CHET_V1]) {
628 vparams.cvp_n1 = ch->counts[CHET_V1];
629 strncpy(vparams.cvp_label1,vendor_labels[0],16);
630 }
631 if (ch->counts[CHET_V2]) {
632 vparams.cvp_n2 = ch->counts[CHET_V2];
633 strncpy(vparams.cvp_label2,vendor_labels[1],16);
634 }
635 if (ch->counts[CHET_V3]) {
636 vparams.cvp_n3 = ch->counts[CHET_V3];
637 strncpy(vparams.cvp_label3,vendor_labels[2],16);
638 }
639 if (ch->counts[CHET_V4]) {
640 vparams.cvp_n4 = ch->counts[CHET_V4];
641 strncpy(vparams.cvp_label4,vendor_labels[3],16);
642 }
643 if (copy_to_user(argp, &vparams, sizeof(vparams)))
644 return -EFAULT;
645 return 0;
646 }
647
648 case CHIOPOSITION:
649 {
650 struct changer_position pos;
651
652 if (copy_from_user(&pos, argp, sizeof (pos)))
653 return -EFAULT;
654
655 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
656 dprintk("CHIOPOSITION: invalid parameter\n");
657 return -EBADSLT;
658 }
659 mutex_lock(&ch->lock);
660 retval = ch_position(ch,0,
661 ch->firsts[pos.cp_type] + pos.cp_unit,
662 pos.cp_flags & CP_INVERT);
663 mutex_unlock(&ch->lock);
664 return retval;
665 }
666
667 case CHIOMOVE:
668 {
669 struct changer_move mv;
670
671 if (copy_from_user(&mv, argp, sizeof (mv)))
672 return -EFAULT;
673
674 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
675 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
676 dprintk("CHIOMOVE: invalid parameter\n");
677 return -EBADSLT;
678 }
679
680 mutex_lock(&ch->lock);
681 retval = ch_move(ch,0,
682 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
683 ch->firsts[mv.cm_totype] + mv.cm_tounit,
684 mv.cm_flags & CM_INVERT);
685 mutex_unlock(&ch->lock);
686 return retval;
687 }
688
689 case CHIOEXCHANGE:
690 {
691 struct changer_exchange mv;
692
693 if (copy_from_user(&mv, argp, sizeof (mv)))
694 return -EFAULT;
695
696 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
697 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
698 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
699 dprintk("CHIOEXCHANGE: invalid parameter\n");
700 return -EBADSLT;
701 }
702
703 mutex_lock(&ch->lock);
704 retval = ch_exchange
705 (ch,0,
706 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
707 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
708 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
709 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
710 mutex_unlock(&ch->lock);
711 return retval;
712 }
713
714 case CHIOGSTATUS:
715 {
716 struct changer_element_status ces;
717
718 if (copy_from_user(&ces, argp, sizeof (ces)))
719 return -EFAULT;
720 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
721 return -EINVAL;
722
723 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
724 }
725
726 case CHIOGELEM:
727 {
728 struct changer_get_element cge;
729 u_char ch_cmd[12];
730 u_char *buffer;
731 unsigned int elem;
732 int result,i;
733
734 if (copy_from_user(&cge, argp, sizeof (cge)))
735 return -EFAULT;
736
737 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
738 return -EINVAL;
739 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
740
741 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
742 if (!buffer)
743 return -ENOMEM;
744 mutex_lock(&ch->lock);
745
746 voltag_retry:
747 memset(ch_cmd, 0, sizeof(ch_cmd));
748 ch_cmd[0] = READ_ELEMENT_STATUS;
749 ch_cmd[1] = (ch->device->lun << 5) |
750 (ch->voltags ? 0x10 : 0) |
751 ch_elem_to_typecode(ch,elem);
752 ch_cmd[2] = (elem >> 8) & 0xff;
753 ch_cmd[3] = elem & 0xff;
754 ch_cmd[5] = 1;
755 ch_cmd[9] = 255;
756
757 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
758 if (!result) {
759 cge.cge_status = buffer[18];
760 cge.cge_flags = 0;
761 if (buffer[18] & CESTATUS_EXCEPT) {
762 cge.cge_errno = EIO;
763 }
764 if (buffer[25] & 0x80) {
765 cge.cge_flags |= CGE_SRC;
766 if (buffer[25] & 0x40)
767 cge.cge_flags |= CGE_INVERT;
768 elem = (buffer[26]<<8) | buffer[27];
769 for (i = 0; i < 4; i++) {
770 if (elem >= ch->firsts[i] &&
771 elem < ch->firsts[i] + ch->counts[i]) {
772 cge.cge_srctype = i;
773 cge.cge_srcunit = elem-ch->firsts[i];
774 }
775 }
776 }
777 if ((buffer[22] & 0x30) == 0x30) {
778 cge.cge_flags |= CGE_IDLUN;
779 cge.cge_id = buffer[23];
780 cge.cge_lun = buffer[22] & 7;
781 }
782 if (buffer[9] & 0x80) {
783 cge.cge_flags |= CGE_PVOLTAG;
784 memcpy(cge.cge_pvoltag,buffer+28,36);
785 }
786 if (buffer[9] & 0x40) {
787 cge.cge_flags |= CGE_AVOLTAG;
788 memcpy(cge.cge_avoltag,buffer+64,36);
789 }
790 } else if (ch->voltags) {
791 ch->voltags = 0;
792 vprintk("device has no volume tag support\n");
793 goto voltag_retry;
794 }
795 kfree(buffer);
796 mutex_unlock(&ch->lock);
797
798 if (copy_to_user(argp, &cge, sizeof (cge)))
799 return -EFAULT;
800 return result;
801 }
802
803 case CHIOINITELEM:
804 {
805 mutex_lock(&ch->lock);
806 retval = ch_init_elem(ch);
807 mutex_unlock(&ch->lock);
808 return retval;
809 }
810
811 case CHIOSVOLTAG:
812 {
813 struct changer_set_voltag csv;
814 int elem;
815
816 if (copy_from_user(&csv, argp, sizeof(csv)))
817 return -EFAULT;
818
819 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
820 dprintk("CHIOSVOLTAG: invalid parameter\n");
821 return -EBADSLT;
822 }
823 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
824 mutex_lock(&ch->lock);
825 retval = ch_set_voltag(ch, elem,
826 csv.csv_flags & CSV_AVOLTAG,
827 csv.csv_flags & CSV_CLEARTAG,
828 csv.csv_voltag);
829 mutex_unlock(&ch->lock);
830 return retval;
831 }
832
833 default:
834 return scsi_ioctl(ch->device, cmd, argp);
835
836 }
837 }
838
839 #ifdef CONFIG_COMPAT
840
841 struct changer_element_status32 {
842 int ces_type;
843 compat_uptr_t ces_data;
844 };
845 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
846
847 static long ch_ioctl_compat(struct file * file,
848 unsigned int cmd, unsigned long arg)
849 {
850 scsi_changer *ch = file->private_data;
851
852 switch (cmd) {
853 case CHIOGPARAMS:
854 case CHIOGVPARAMS:
855 case CHIOPOSITION:
856 case CHIOMOVE:
857 case CHIOEXCHANGE:
858 case CHIOGELEM:
859 case CHIOINITELEM:
860 case CHIOSVOLTAG:
861 /* compatible */
862 return ch_ioctl(file, cmd, arg);
863 case CHIOGSTATUS32:
864 {
865 struct changer_element_status32 ces32;
866 unsigned char __user *data;
867
868 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
869 return -EFAULT;
870 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
871 return -EINVAL;
872
873 data = compat_ptr(ces32.ces_data);
874 return ch_gstatus(ch, ces32.ces_type, data);
875 }
876 default:
877 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
878 return -ENOIOCTLCMD;
879
880 }
881 }
882 #endif
883
884 /* ------------------------------------------------------------------------ */
885
886 static int ch_probe(struct device *dev)
887 {
888 struct scsi_device *sd = to_scsi_device(dev);
889 struct device *class_dev;
890 int minor, ret = -ENOMEM;
891 scsi_changer *ch;
892
893 if (sd->type != TYPE_MEDIUM_CHANGER)
894 return -ENODEV;
895
896 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
897 if (NULL == ch)
898 return -ENOMEM;
899
900 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
901 goto free_ch;
902
903 spin_lock(&ch_index_lock);
904 ret = idr_get_new(&ch_index_idr, ch, &minor);
905 spin_unlock(&ch_index_lock);
906
907 if (ret)
908 goto free_ch;
909
910 if (minor > CH_MAX_DEVS) {
911 ret = -ENODEV;
912 goto remove_idr;
913 }
914
915 ch->minor = minor;
916 sprintf(ch->name,"ch%d",ch->minor);
917
918 class_dev = device_create(ch_sysfs_class, dev,
919 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
920 "s%s", ch->name);
921 if (IS_ERR(class_dev)) {
922 printk(KERN_WARNING "ch%d: device_create failed\n",
923 ch->minor);
924 ret = PTR_ERR(class_dev);
925 goto remove_idr;
926 }
927
928 mutex_init(&ch->lock);
929 ch->device = sd;
930 ch_readconfig(ch);
931 if (init)
932 ch_init_elem(ch);
933
934 dev_set_drvdata(dev, ch);
935 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
936
937 return 0;
938 remove_idr:
939 idr_remove(&ch_index_idr, minor);
940 free_ch:
941 kfree(ch);
942 return ret;
943 }
944
945 static int ch_remove(struct device *dev)
946 {
947 scsi_changer *ch = dev_get_drvdata(dev);
948
949 spin_lock(&ch_index_lock);
950 idr_remove(&ch_index_idr, ch->minor);
951 spin_unlock(&ch_index_lock);
952
953 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
954 kfree(ch->dt);
955 kfree(ch);
956 return 0;
957 }
958
959 static struct scsi_driver ch_template = {
960 .owner = THIS_MODULE,
961 .gendrv = {
962 .name = "ch",
963 .probe = ch_probe,
964 .remove = ch_remove,
965 },
966 };
967
968 static const struct file_operations changer_fops = {
969 .owner = THIS_MODULE,
970 .open = ch_open,
971 .release = ch_release,
972 .unlocked_ioctl = ch_ioctl,
973 #ifdef CONFIG_COMPAT
974 .compat_ioctl = ch_ioctl_compat,
975 #endif
976 };
977
978 static int __init init_ch_module(void)
979 {
980 int rc;
981
982 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
983 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
984 if (IS_ERR(ch_sysfs_class)) {
985 rc = PTR_ERR(ch_sysfs_class);
986 return rc;
987 }
988 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
989 if (rc < 0) {
990 printk("Unable to get major %d for SCSI-Changer\n",
991 SCSI_CHANGER_MAJOR);
992 goto fail1;
993 }
994 rc = scsi_register_driver(&ch_template.gendrv);
995 if (rc < 0)
996 goto fail2;
997 return 0;
998
999 fail2:
1000 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1001 fail1:
1002 class_destroy(ch_sysfs_class);
1003 return rc;
1004 }
1005
1006 static void __exit exit_ch_module(void)
1007 {
1008 scsi_unregister_driver(&ch_template.gendrv);
1009 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1010 class_destroy(ch_sysfs_class);
1011 idr_destroy(&ch_index_idr);
1012 }
1013
1014 module_init(init_ch_module);
1015 module_exit(exit_ch_module);
1016
1017 /*
1018 * Local variables:
1019 * c-basic-offset: 8
1020 * End:
1021 */
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