1
2
3
4
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>
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
40MODULE_DESCRIPTION("device driver for scsi media changer devices");
41MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42MODULE_LICENSE("GPL");
43MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
45
46static int init = 1;
47module_param(init, int, 0444);
48MODULE_PARM_DESC(init, \
49 "initialize element status on driver load (default: on)");
50
51static int timeout_move = 300;
52module_param(timeout_move, int, 0644);
53MODULE_PARM_DESC(timeout_move,"timeout for move commands "
54 "(default: 300 seconds)");
55
56static int timeout_init = 3600;
57module_param(timeout_init, int, 0644);
58MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
59 "(default: 3600 seconds)");
60
61static int verbose = 1;
62module_param(verbose, int, 0644);
63MODULE_PARM_DESC(verbose,"be verbose (default: on)");
64
65static int debug = 0;
66module_param(debug, int, 0644);
67MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
68 "detailed sense codes on scsi errors (default: off)");
69
70static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
71static int dt_lun[CH_DT_MAX];
72module_param_array(dt_id, int, NULL, 0444);
73module_param_array(dt_lun, int, NULL, 0444);
74
75
76static int vendor_firsts[CH_TYPES-4];
77static int vendor_counts[CH_TYPES-4];
78module_param_array(vendor_firsts, int, NULL, 0444);
79module_param_array(vendor_counts, int, NULL, 0444);
80
81static const char * vendor_labels[CH_TYPES-4] = {
82 "v0", "v1", "v2", "v3"
83};
84
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
95static struct class * ch_sysfs_class;
96
97typedef struct {
98 struct list_head list;
99 int minor;
100 char name[8];
101 struct scsi_device *device;
102 struct scsi_device **dt;
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
110static DEFINE_IDR(ch_index_idr);
111static DEFINE_SPINLOCK(ch_index_lock);
112
113static const struct {
114 unsigned char sense;
115 unsigned char asc;
116 unsigned char ascq;
117 int errno;
118} ch_err[] = {
119
120
121 {
122 .sense = ILLEGAL_REQUEST,
123 .asc = 0x21,
124 .ascq = 0x01,
125 .errno = EBADSLT,
126 },{
127 .sense = ILLEGAL_REQUEST,
128 .asc = 0x28,
129 .ascq = 0x01,
130 .errno = EBADE,
131 },{
132 .sense = ILLEGAL_REQUEST,
133 .asc = 0x3B,
134 .ascq = 0x0D,
135 .errno = EXFULL,
136 },{
137 .sense = ILLEGAL_REQUEST,
138 .asc = 0x3B,
139 .ascq = 0x0E,
140 .errno = EBADE,
141 },{
142 .sense = ILLEGAL_REQUEST,
143 .asc = 0x20,
144 .ascq = 0x00,
145 .errno = EBADRQC,
146 },{
147
148 }
149};
150
151
152
153static int ch_find_errno(struct scsi_sense_hdr *sshdr)
154{
155 int i,errno = 0;
156
157
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
174static int
175ch_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
215static int
216ch_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
229static int
230ch_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
270static int
271ch_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
285static int
286ch_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
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
354 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
355 GFP_KERNEL);
356
357 if (!ch->dt) {
358 kfree(buffer);
359 return -ENOMEM;
360 }
361
362 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
363 id = -1;
364 lun = 0;
365 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
366 id = dt_id[elem];
367 lun = dt_lun[elem];
368 vprintk("dt 0x%x: [insmod option] ",
369 elem+ch->firsts[CHET_DT]);
370 } else if (0 != ch_read_element_status
371 (ch,elem+ch->firsts[CHET_DT],data)) {
372 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
373 elem+ch->firsts[CHET_DT]);
374 } else {
375 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
376 if (data[6] & 0x80) {
377 if (verbose)
378 printk("not this SCSI bus\n");
379 ch->dt[elem] = NULL;
380 } else if (0 == (data[6] & 0x30)) {
381 if (verbose)
382 printk("ID/LUN unknown\n");
383 ch->dt[elem] = NULL;
384 } else {
385 id = ch->device->id;
386 lun = 0;
387 if (data[6] & 0x20) id = data[7];
388 if (data[6] & 0x10) lun = data[6] & 7;
389 }
390 }
391 if (-1 != id) {
392 if (verbose)
393 printk("ID %i, LUN %i, ",id,lun);
394 ch->dt[elem] =
395 scsi_device_lookup(ch->device->host,
396 ch->device->channel,
397 id,lun);
398 if (!ch->dt[elem]) {
399
400 if (verbose)
401 printk("Huh? device not found!\n");
402 } else {
403 if (verbose)
404 printk("name: %8.8s %16.16s %4.4s\n",
405 ch->dt[elem]->vendor,
406 ch->dt[elem]->model,
407 ch->dt[elem]->rev);
408 }
409 }
410 }
411 ch->voltags = 1;
412 kfree(buffer);
413
414 return 0;
415}
416
417
418
419static int
420ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
421{
422 u_char cmd[10];
423
424 dprintk("position: 0x%x\n",elem);
425 if (0 == trans)
426 trans = ch->firsts[CHET_MT];
427 memset(cmd,0,sizeof(cmd));
428 cmd[0] = POSITION_TO_ELEMENT;
429 cmd[1] = ch->device->lun << 5;
430 cmd[2] = (trans >> 8) & 0xff;
431 cmd[3] = trans & 0xff;
432 cmd[4] = (elem >> 8) & 0xff;
433 cmd[5] = elem & 0xff;
434 cmd[8] = rotate ? 1 : 0;
435 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
436}
437
438static int
439ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
440{
441 u_char cmd[12];
442
443 dprintk("move: 0x%x => 0x%x\n",src,dest);
444 if (0 == trans)
445 trans = ch->firsts[CHET_MT];
446 memset(cmd,0,sizeof(cmd));
447 cmd[0] = MOVE_MEDIUM;
448 cmd[1] = ch->device->lun << 5;
449 cmd[2] = (trans >> 8) & 0xff;
450 cmd[3] = trans & 0xff;
451 cmd[4] = (src >> 8) & 0xff;
452 cmd[5] = src & 0xff;
453 cmd[6] = (dest >> 8) & 0xff;
454 cmd[7] = dest & 0xff;
455 cmd[10] = rotate ? 1 : 0;
456 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
457}
458
459static int
460ch_exchange(scsi_changer *ch, u_int trans, u_int src,
461 u_int dest1, u_int dest2, int rotate1, int rotate2)
462{
463 u_char cmd[12];
464
465 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
466 src,dest1,dest2);
467 if (0 == trans)
468 trans = ch->firsts[CHET_MT];
469 memset(cmd,0,sizeof(cmd));
470 cmd[0] = EXCHANGE_MEDIUM;
471 cmd[1] = ch->device->lun << 5;
472 cmd[2] = (trans >> 8) & 0xff;
473 cmd[3] = trans & 0xff;
474 cmd[4] = (src >> 8) & 0xff;
475 cmd[5] = src & 0xff;
476 cmd[6] = (dest1 >> 8) & 0xff;
477 cmd[7] = dest1 & 0xff;
478 cmd[8] = (dest2 >> 8) & 0xff;
479 cmd[9] = dest2 & 0xff;
480 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
481
482 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
483}
484
485static void
486ch_check_voltag(char *tag)
487{
488 int i;
489
490 for (i = 0; i < 32; i++) {
491
492 if (tag[i] >= 0x7f || tag[i] < 0x20)
493 tag[i] = ' ';
494
495 if (tag[i] == '?' ||
496 tag[i] == '*')
497 tag[i] = ' ';
498 }
499}
500
501static int
502ch_set_voltag(scsi_changer *ch, u_int elem,
503 int alternate, int clear, u_char *tag)
504{
505 u_char cmd[12];
506 u_char *buffer;
507 int result;
508
509 buffer = kzalloc(512, GFP_KERNEL);
510 if (!buffer)
511 return -ENOMEM;
512
513 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
514 clear ? "clear" : "set",
515 alternate ? "alternate" : "primary",
516 elem, tag);
517 memset(cmd,0,sizeof(cmd));
518 cmd[0] = SEND_VOLUME_TAG;
519 cmd[1] = (ch->device->lun << 5) |
520 ch_elem_to_typecode(ch,elem);
521 cmd[2] = (elem >> 8) & 0xff;
522 cmd[3] = elem & 0xff;
523 cmd[5] = clear
524 ? (alternate ? 0x0d : 0x0c)
525 : (alternate ? 0x0b : 0x0a);
526
527 cmd[9] = 255;
528
529 memcpy(buffer,tag,32);
530 ch_check_voltag(buffer);
531
532 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
533 kfree(buffer);
534 return result;
535}
536
537static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
538{
539 int retval = 0;
540 u_char data[16];
541 unsigned int i;
542
543 mutex_lock(&ch->lock);
544 for (i = 0; i < ch->counts[type]; i++) {
545 if (0 != ch_read_element_status
546 (ch, ch->firsts[type]+i,data)) {
547 retval = -EIO;
548 break;
549 }
550 put_user(data[2], dest+i);
551 if (data[2] & CESTATUS_EXCEPT)
552 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
553 ch->firsts[type]+i,
554 (int)data[4],(int)data[5]);
555 retval = ch_read_element_status
556 (ch, ch->firsts[type]+i,data);
557 if (0 != retval)
558 break;
559 }
560 mutex_unlock(&ch->lock);
561 return retval;
562}
563
564
565
566static int
567ch_release(struct inode *inode, struct file *file)
568{
569 scsi_changer *ch = file->private_data;
570
571 scsi_device_put(ch->device);
572 file->private_data = NULL;
573 return 0;
574}
575
576static int
577ch_open(struct inode *inode, struct file *file)
578{
579 scsi_changer *ch;
580 int minor = iminor(inode);
581
582 lock_kernel();
583 spin_lock(&ch_index_lock);
584 ch = idr_find(&ch_index_idr, minor);
585
586 if (NULL == ch || scsi_device_get(ch->device)) {
587 spin_unlock(&ch_index_lock);
588 unlock_kernel();
589 return -ENXIO;
590 }
591 spin_unlock(&ch_index_lock);
592
593 file->private_data = ch;
594 unlock_kernel();
595 return 0;
596}
597
598static int
599ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
600{
601 if (type >= CH_TYPES || unit >= ch->counts[type])
602 return -1;
603 return 0;
604}
605
606static long ch_ioctl(struct file *file,
607 unsigned int cmd, unsigned long arg)
608{
609 scsi_changer *ch = file->private_data;
610 int retval;
611 void __user *argp = (void __user *)arg;
612
613 switch (cmd) {
614 case CHIOGPARAMS:
615 {
616 struct changer_params params;
617
618 params.cp_curpicker = 0;
619 params.cp_npickers = ch->counts[CHET_MT];
620 params.cp_nslots = ch->counts[CHET_ST];
621 params.cp_nportals = ch->counts[CHET_IE];
622 params.cp_ndrives = ch->counts[CHET_DT];
623
624 if (copy_to_user(argp, ¶ms, sizeof(params)))
625 return -EFAULT;
626 return 0;
627 }
628 case CHIOGVPARAMS:
629 {
630 struct changer_vendor_params vparams;
631
632 memset(&vparams,0,sizeof(vparams));
633 if (ch->counts[CHET_V1]) {
634 vparams.cvp_n1 = ch->counts[CHET_V1];
635 strncpy(vparams.cvp_label1,vendor_labels[0],16);
636 }
637 if (ch->counts[CHET_V2]) {
638 vparams.cvp_n2 = ch->counts[CHET_V2];
639 strncpy(vparams.cvp_label2,vendor_labels[1],16);
640 }
641 if (ch->counts[CHET_V3]) {
642 vparams.cvp_n3 = ch->counts[CHET_V3];
643 strncpy(vparams.cvp_label3,vendor_labels[2],16);
644 }
645 if (ch->counts[CHET_V4]) {
646 vparams.cvp_n4 = ch->counts[CHET_V4];
647 strncpy(vparams.cvp_label4,vendor_labels[3],16);
648 }
649 if (copy_to_user(argp, &vparams, sizeof(vparams)))
650 return -EFAULT;
651 return 0;
652 }
653
654 case CHIOPOSITION:
655 {
656 struct changer_position pos;
657
658 if (copy_from_user(&pos, argp, sizeof (pos)))
659 return -EFAULT;
660
661 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
662 dprintk("CHIOPOSITION: invalid parameter\n");
663 return -EBADSLT;
664 }
665 mutex_lock(&ch->lock);
666 retval = ch_position(ch,0,
667 ch->firsts[pos.cp_type] + pos.cp_unit,
668 pos.cp_flags & CP_INVERT);
669 mutex_unlock(&ch->lock);
670 return retval;
671 }
672
673 case CHIOMOVE:
674 {
675 struct changer_move mv;
676
677 if (copy_from_user(&mv, argp, sizeof (mv)))
678 return -EFAULT;
679
680 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
681 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
682 dprintk("CHIOMOVE: invalid parameter\n");
683 return -EBADSLT;
684 }
685
686 mutex_lock(&ch->lock);
687 retval = ch_move(ch,0,
688 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
689 ch->firsts[mv.cm_totype] + mv.cm_tounit,
690 mv.cm_flags & CM_INVERT);
691 mutex_unlock(&ch->lock);
692 return retval;
693 }
694
695 case CHIOEXCHANGE:
696 {
697 struct changer_exchange mv;
698
699 if (copy_from_user(&mv, argp, sizeof (mv)))
700 return -EFAULT;
701
702 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
703 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
704 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
705 dprintk("CHIOEXCHANGE: invalid parameter\n");
706 return -EBADSLT;
707 }
708
709 mutex_lock(&ch->lock);
710 retval = ch_exchange
711 (ch,0,
712 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
713 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
714 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
715 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
716 mutex_unlock(&ch->lock);
717 return retval;
718 }
719
720 case CHIOGSTATUS:
721 {
722 struct changer_element_status ces;
723
724 if (copy_from_user(&ces, argp, sizeof (ces)))
725 return -EFAULT;
726 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
727 return -EINVAL;
728
729 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
730 }
731
732 case CHIOGELEM:
733 {
734 struct changer_get_element cge;
735 u_char ch_cmd[12];
736 u_char *buffer;
737 unsigned int elem;
738 int result,i;
739
740 if (copy_from_user(&cge, argp, sizeof (cge)))
741 return -EFAULT;
742
743 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
744 return -EINVAL;
745 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
746
747 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
748 if (!buffer)
749 return -ENOMEM;
750 mutex_lock(&ch->lock);
751
752 voltag_retry:
753 memset(ch_cmd, 0, sizeof(ch_cmd));
754 ch_cmd[0] = READ_ELEMENT_STATUS;
755 ch_cmd[1] = (ch->device->lun << 5) |
756 (ch->voltags ? 0x10 : 0) |
757 ch_elem_to_typecode(ch,elem);
758 ch_cmd[2] = (elem >> 8) & 0xff;
759 ch_cmd[3] = elem & 0xff;
760 ch_cmd[5] = 1;
761 ch_cmd[9] = 255;
762
763 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
764 if (!result) {
765 cge.cge_status = buffer[18];
766 cge.cge_flags = 0;
767 if (buffer[18] & CESTATUS_EXCEPT) {
768 cge.cge_errno = EIO;
769 }
770 if (buffer[25] & 0x80) {
771 cge.cge_flags |= CGE_SRC;
772 if (buffer[25] & 0x40)
773 cge.cge_flags |= CGE_INVERT;
774 elem = (buffer[26]<<8) | buffer[27];
775 for (i = 0; i < 4; i++) {
776 if (elem >= ch->firsts[i] &&
777 elem < ch->firsts[i] + ch->counts[i]) {
778 cge.cge_srctype = i;
779 cge.cge_srcunit = elem-ch->firsts[i];
780 }
781 }
782 }
783 if ((buffer[22] & 0x30) == 0x30) {
784 cge.cge_flags |= CGE_IDLUN;
785 cge.cge_id = buffer[23];
786 cge.cge_lun = buffer[22] & 7;
787 }
788 if (buffer[9] & 0x80) {
789 cge.cge_flags |= CGE_PVOLTAG;
790 memcpy(cge.cge_pvoltag,buffer+28,36);
791 }
792 if (buffer[9] & 0x40) {
793 cge.cge_flags |= CGE_AVOLTAG;
794 memcpy(cge.cge_avoltag,buffer+64,36);
795 }
796 } else if (ch->voltags) {
797 ch->voltags = 0;
798 vprintk("device has no volume tag support\n");
799 goto voltag_retry;
800 }
801 kfree(buffer);
802 mutex_unlock(&ch->lock);
803
804 if (copy_to_user(argp, &cge, sizeof (cge)))
805 return -EFAULT;
806 return result;
807 }
808
809 case CHIOINITELEM:
810 {
811 mutex_lock(&ch->lock);
812 retval = ch_init_elem(ch);
813 mutex_unlock(&ch->lock);
814 return retval;
815 }
816
817 case CHIOSVOLTAG:
818 {
819 struct changer_set_voltag csv;
820 int elem;
821
822 if (copy_from_user(&csv, argp, sizeof(csv)))
823 return -EFAULT;
824
825 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
826 dprintk("CHIOSVOLTAG: invalid parameter\n");
827 return -EBADSLT;
828 }
829 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
830 mutex_lock(&ch->lock);
831 retval = ch_set_voltag(ch, elem,
832 csv.csv_flags & CSV_AVOLTAG,
833 csv.csv_flags & CSV_CLEARTAG,
834 csv.csv_voltag);
835 mutex_unlock(&ch->lock);
836 return retval;
837 }
838
839 default:
840 return scsi_ioctl(ch->device, cmd, argp);
841
842 }
843}
844
845#ifdef CONFIG_COMPAT
846
847struct changer_element_status32 {
848 int ces_type;
849 compat_uptr_t ces_data;
850};
851#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
852
853static long ch_ioctl_compat(struct file * file,
854 unsigned int cmd, unsigned long arg)
855{
856 scsi_changer *ch = file->private_data;
857
858 switch (cmd) {
859 case CHIOGPARAMS:
860 case CHIOGVPARAMS:
861 case CHIOPOSITION:
862 case CHIOMOVE:
863 case CHIOEXCHANGE:
864 case CHIOGELEM:
865 case CHIOINITELEM:
866 case CHIOSVOLTAG:
867
868 return ch_ioctl(file, cmd, arg);
869 case CHIOGSTATUS32:
870 {
871 struct changer_element_status32 ces32;
872 unsigned char __user *data;
873
874 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
875 return -EFAULT;
876 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
877 return -EINVAL;
878
879 data = compat_ptr(ces32.ces_data);
880 return ch_gstatus(ch, ces32.ces_type, data);
881 }
882 default:
883
884 return -ENOIOCTLCMD;
885
886 }
887}
888#endif
889
890
891
892static int ch_probe(struct device *dev)
893{
894 struct scsi_device *sd = to_scsi_device(dev);
895 struct device *class_dev;
896 int minor, ret = -ENOMEM;
897 scsi_changer *ch;
898
899 if (sd->type != TYPE_MEDIUM_CHANGER)
900 return -ENODEV;
901
902 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
903 if (NULL == ch)
904 return -ENOMEM;
905
906 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
907 goto free_ch;
908
909 spin_lock(&ch_index_lock);
910 ret = idr_get_new(&ch_index_idr, ch, &minor);
911 spin_unlock(&ch_index_lock);
912
913 if (ret)
914 goto free_ch;
915
916 if (minor > CH_MAX_DEVS) {
917 ret = -ENODEV;
918 goto remove_idr;
919 }
920
921 ch->minor = minor;
922 sprintf(ch->name,"ch%d",ch->minor);
923
924 class_dev = device_create(ch_sysfs_class, dev,
925 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
926 "s%s", ch->name);
927 if (IS_ERR(class_dev)) {
928 printk(KERN_WARNING "ch%d: device_create failed\n",
929 ch->minor);
930 ret = PTR_ERR(class_dev);
931 goto remove_idr;
932 }
933
934 mutex_init(&ch->lock);
935 ch->device = sd;
936 ch_readconfig(ch);
937 if (init)
938 ch_init_elem(ch);
939
940 dev_set_drvdata(dev, ch);
941 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
942
943 return 0;
944remove_idr:
945 idr_remove(&ch_index_idr, minor);
946free_ch:
947 kfree(ch);
948 return ret;
949}
950
951static int ch_remove(struct device *dev)
952{
953 scsi_changer *ch = dev_get_drvdata(dev);
954
955 spin_lock(&ch_index_lock);
956 idr_remove(&ch_index_idr, ch->minor);
957 spin_unlock(&ch_index_lock);
958
959 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
960 kfree(ch->dt);
961 kfree(ch);
962 return 0;
963}
964
965static struct scsi_driver ch_template = {
966 .owner = THIS_MODULE,
967 .gendrv = {
968 .name = "ch",
969 .probe = ch_probe,
970 .remove = ch_remove,
971 },
972};
973
974static const struct file_operations changer_fops = {
975 .owner = THIS_MODULE,
976 .open = ch_open,
977 .release = ch_release,
978 .unlocked_ioctl = ch_ioctl,
979#ifdef CONFIG_COMPAT
980 .compat_ioctl = ch_ioctl_compat,
981#endif
982};
983
984static int __init init_ch_module(void)
985{
986 int rc;
987
988 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
989 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
990 if (IS_ERR(ch_sysfs_class)) {
991 rc = PTR_ERR(ch_sysfs_class);
992 return rc;
993 }
994 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
995 if (rc < 0) {
996 printk("Unable to get major %d for SCSI-Changer\n",
997 SCSI_CHANGER_MAJOR);
998 goto fail1;
999 }
1000 rc = scsi_register_driver(&ch_template.gendrv);
1001 if (rc < 0)
1002 goto fail2;
1003 return 0;
1004
1005 fail2:
1006 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1007 fail1:
1008 class_destroy(ch_sysfs_class);
1009 return rc;
1010}
1011
1012static void __exit exit_ch_module(void)
1013{
1014 scsi_unregister_driver(&ch_template.gendrv);
1015 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1016 class_destroy(ch_sysfs_class);
1017 idr_destroy(&ch_index_idr);
1018}
1019
1020module_init(init_ch_module);
1021module_exit(exit_ch_module);
1022
1023
1024
1025
1026
1027
1028
