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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/slab.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 DEFINE_MUTEX(ch_mutex);
47static int init = 1;
48module_param(init, int, 0444);
49MODULE_PARM_DESC(init, \
50 "initialize element status on driver load (default: on)");
51
52static int timeout_move = 300;
53module_param(timeout_move, int, 0644);
54MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55 "(default: 300 seconds)");
56
57static int timeout_init = 3600;
58module_param(timeout_init, int, 0644);
59MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60 "(default: 3600 seconds)");
61
62static int verbose = 1;
63module_param(verbose, int, 0644);
64MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66static int debug = 0;
67module_param(debug, int, 0644);
68MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69 "detailed sense codes on scsi errors (default: off)");
70
71static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72static int dt_lun[CH_DT_MAX];
73module_param_array(dt_id, int, NULL, 0444);
74module_param_array(dt_lun, int, NULL, 0444);
75
76/* tell the driver about vendor-specific slots */
77static int vendor_firsts[CH_TYPES-4];
78static int vendor_counts[CH_TYPES-4];
79module_param_array(vendor_firsts, int, NULL, 0444);
80module_param_array(vendor_counts, int, NULL, 0444);
81
82static const char * vendor_labels[CH_TYPES-4] = {
83 "v0", "v1", "v2", "v3"
84};
85// module_param_string_array(vendor_labels, NULL, 0444);
86
87#define ch_printk(prefix, ch, fmt, a...) \
88 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
89
90#define DPRINTK(fmt, arg...) \
91do { \
92 if (debug) \
93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
94} while (0)
95#define VPRINTK(level, fmt, arg...) \
96do { \
97 if (verbose) \
98 ch_printk(level, ch, fmt, ##arg); \
99} while (0)
100
101/* ------------------------------------------------------------------- */
102
103#define MAX_RETRIES 1
104
105static struct class * ch_sysfs_class;
106
107typedef struct {
108 struct list_head list;
109 int minor;
110 char name[8];
111 struct scsi_device *device;
112 struct scsi_device **dt; /* ptrs to data transfer elements */
113 u_int firsts[CH_TYPES];
114 u_int counts[CH_TYPES];
115 u_int unit_attention;
116 u_int voltags;
117 struct mutex lock;
118} scsi_changer;
119
120static DEFINE_IDR(ch_index_idr);
121static DEFINE_SPINLOCK(ch_index_lock);
122
123static const struct {
124 unsigned char sense;
125 unsigned char asc;
126 unsigned char ascq;
127 int errno;
128} ch_err[] = {
129/* Just filled in what looks right. Hav'nt checked any standard paper for
130 these errno assignments, so they may be wrong... */
131 {
132 .sense = ILLEGAL_REQUEST,
133 .asc = 0x21,
134 .ascq = 0x01,
135 .errno = EBADSLT, /* Invalid element address */
136 },{
137 .sense = ILLEGAL_REQUEST,
138 .asc = 0x28,
139 .ascq = 0x01,
140 .errno = EBADE, /* Import or export element accessed */
141 },{
142 .sense = ILLEGAL_REQUEST,
143 .asc = 0x3B,
144 .ascq = 0x0D,
145 .errno = EXFULL, /* Medium destination element full */
146 },{
147 .sense = ILLEGAL_REQUEST,
148 .asc = 0x3B,
149 .ascq = 0x0E,
150 .errno = EBADE, /* Medium source element empty */
151 },{
152 .sense = ILLEGAL_REQUEST,
153 .asc = 0x20,
154 .ascq = 0x00,
155 .errno = EBADRQC, /* Invalid command operation code */
156 },{
157 /* end of list */
158 }
159};
160
161/* ------------------------------------------------------------------- */
162
163static int ch_find_errno(struct scsi_sense_hdr *sshdr)
164{
165 int i,errno = 0;
166
167 /* Check to see if additional sense information is available */
168 if (scsi_sense_valid(sshdr) &&
169 sshdr->asc != 0) {
170 for (i = 0; ch_err[i].errno != 0; i++) {
171 if (ch_err[i].sense == sshdr->sense_key &&
172 ch_err[i].asc == sshdr->asc &&
173 ch_err[i].ascq == sshdr->ascq) {
174 errno = -ch_err[i].errno;
175 break;
176 }
177 }
178 }
179 if (errno == 0)
180 errno = -EIO;
181 return errno;
182}
183
184static int
185ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
186 void *buffer, unsigned buflength,
187 enum dma_data_direction direction)
188{
189 int errno, retries = 0, timeout, result;
190 struct scsi_sense_hdr sshdr;
191
192 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
193 ? timeout_init : timeout_move;
194
195 retry:
196 errno = 0;
197 result = scsi_execute_req(ch->device, cmd, direction, buffer,
198 buflength, &sshdr, timeout * HZ,
199 MAX_RETRIES, NULL);
200
201 if (driver_byte(result) & DRIVER_SENSE) {
202 if (debug)
203 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
204 errno = ch_find_errno(&sshdr);
205
206 switch(sshdr.sense_key) {
207 case UNIT_ATTENTION:
208 ch->unit_attention = 1;
209 if (retries++ < 3)
210 goto retry;
211 break;
212 }
213 }
214 return errno;
215}
216
217/* ------------------------------------------------------------------------ */
218
219static int
220ch_elem_to_typecode(scsi_changer *ch, u_int elem)
221{
222 int i;
223
224 for (i = 0; i < CH_TYPES; i++) {
225 if (elem >= ch->firsts[i] &&
226 elem < ch->firsts[i] +
227 ch->counts[i])
228 return i+1;
229 }
230 return 0;
231}
232
233static int
234ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
235{
236 u_char cmd[12];
237 u_char *buffer;
238 int result;
239
240 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
241 if(!buffer)
242 return -ENOMEM;
243
244 retry:
245 memset(cmd,0,sizeof(cmd));
246 cmd[0] = READ_ELEMENT_STATUS;
247 cmd[1] = ((ch->device->lun & 0x7) << 5) |
248 (ch->voltags ? 0x10 : 0) |
249 ch_elem_to_typecode(ch,elem);
250 cmd[2] = (elem >> 8) & 0xff;
251 cmd[3] = elem & 0xff;
252 cmd[5] = 1;
253 cmd[9] = 255;
254 if (0 == (result = ch_do_scsi(ch, cmd, 12,
255 buffer, 256, DMA_FROM_DEVICE))) {
256 if (((buffer[16] << 8) | buffer[17]) != elem) {
257 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
258 elem,(buffer[16] << 8) | buffer[17]);
259 kfree(buffer);
260 return -EIO;
261 }
262 memcpy(data,buffer+16,16);
263 } else {
264 if (ch->voltags) {
265 ch->voltags = 0;
266 VPRINTK(KERN_INFO, "device has no volume tag support\n");
267 goto retry;
268 }
269 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
270 }
271 kfree(buffer);
272 return result;
273}
274
275static int
276ch_init_elem(scsi_changer *ch)
277{
278 int err;
279 u_char cmd[6];
280
281 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
282 memset(cmd,0,sizeof(cmd));
283 cmd[0] = INITIALIZE_ELEMENT_STATUS;
284 cmd[1] = (ch->device->lun & 0x7) << 5;
285 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
286 VPRINTK(KERN_INFO, "... finished\n");
287 return err;
288}
289
290static int
291ch_readconfig(scsi_changer *ch)
292{
293 u_char cmd[10], data[16];
294 u_char *buffer;
295 int result,id,lun,i;
296 u_int elem;
297
298 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
299 if (!buffer)
300 return -ENOMEM;
301
302 memset(cmd,0,sizeof(cmd));
303 cmd[0] = MODE_SENSE;
304 cmd[1] = (ch->device->lun & 0x7) << 5;
305 cmd[2] = 0x1d;
306 cmd[4] = 255;
307 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
308 if (0 != result) {
309 cmd[1] |= (1<<3);
310 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
311 }
312 if (0 == result) {
313 ch->firsts[CHET_MT] =
314 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
315 ch->counts[CHET_MT] =
316 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
317 ch->firsts[CHET_ST] =
318 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
319 ch->counts[CHET_ST] =
320 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
321 ch->firsts[CHET_IE] =
322 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
323 ch->counts[CHET_IE] =
324 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
325 ch->firsts[CHET_DT] =
326 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
327 ch->counts[CHET_DT] =
328 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
329 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
330 ch->firsts[CHET_MT],
331 ch->counts[CHET_MT]);
332 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
333 ch->firsts[CHET_ST],
334 ch->counts[CHET_ST]);
335 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
336 ch->firsts[CHET_IE],
337 ch->counts[CHET_IE]);
338 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
339 ch->firsts[CHET_DT],
340 ch->counts[CHET_DT]);
341 } else {
342 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
343 }
344
345 /* vendor specific element types */
346 for (i = 0; i < 4; i++) {
347 if (0 == vendor_counts[i])
348 continue;
349 if (NULL == vendor_labels[i])
350 continue;
351 ch->firsts[CHET_V1+i] = vendor_firsts[i];
352 ch->counts[CHET_V1+i] = vendor_counts[i];
353 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
354 i+5,i+1,vendor_firsts[i],vendor_counts[i],
355 vendor_labels[i]);
356 }
357
358 /* look up the devices of the data transfer elements */
359 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
360 GFP_KERNEL);
361
362 if (!ch->dt) {
363 kfree(buffer);
364 return -ENOMEM;
365 }
366
367 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
368 id = -1;
369 lun = 0;
370 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
371 id = dt_id[elem];
372 lun = dt_lun[elem];
373 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
374 elem+ch->firsts[CHET_DT]);
375 } else if (0 != ch_read_element_status
376 (ch,elem+ch->firsts[CHET_DT],data)) {
377 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
378 elem+ch->firsts[CHET_DT]);
379 } else {
380 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
381 if (data[6] & 0x80) {
382 VPRINTK(KERN_CONT, "not this SCSI bus\n");
383 ch->dt[elem] = NULL;
384 } else if (0 == (data[6] & 0x30)) {
385 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
386 ch->dt[elem] = NULL;
387 } else {
388 id = ch->device->id;
389 lun = 0;
390 if (data[6] & 0x20) id = data[7];
391 if (data[6] & 0x10) lun = data[6] & 7;
392 }
393 }
394 if (-1 != id) {
395 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
396 ch->dt[elem] =
397 scsi_device_lookup(ch->device->host,
398 ch->device->channel,
399 id,lun);
400 if (!ch->dt[elem]) {
401 /* should not happen */
402 VPRINTK(KERN_CONT, "Huh? device not found!\n");
403 } else {
404 VPRINTK(KERN_CONT, "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 & 0x7) << 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, 10, 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 & 0x7) << 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, 12, 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 & 0x7) << 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, 12, 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 /* restrict to ascii */
492 if (tag[i] >= 0x7f || tag[i] < 0x20)
493 tag[i] = ' ';
494 /* don't allow search wildcards */
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 & 0x7) << 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, 12, 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(KERN_INFO, "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 mutex_lock(&ch_mutex);
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 mutex_unlock(&ch_mutex);
589 return -ENXIO;
590 }
591 spin_unlock(&ch_index_lock);
592
593 file->private_data = ch;
594 mutex_unlock(&ch_mutex);
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 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
614 file->f_flags & O_NDELAY);
615 if (retval)
616 return retval;
617
618 switch (cmd) {
619 case CHIOGPARAMS:
620 {
621 struct changer_params params;
622
623 params.cp_curpicker = 0;
624 params.cp_npickers = ch->counts[CHET_MT];
625 params.cp_nslots = ch->counts[CHET_ST];
626 params.cp_nportals = ch->counts[CHET_IE];
627 params.cp_ndrives = ch->counts[CHET_DT];
628
629 if (copy_to_user(argp, ¶ms, sizeof(params)))
630 return -EFAULT;
631 return 0;
632 }
633 case CHIOGVPARAMS:
634 {
635 struct changer_vendor_params vparams;
636
637 memset(&vparams,0,sizeof(vparams));
638 if (ch->counts[CHET_V1]) {
639 vparams.cvp_n1 = ch->counts[CHET_V1];
640 strncpy(vparams.cvp_label1,vendor_labels[0],16);
641 }
642 if (ch->counts[CHET_V2]) {
643 vparams.cvp_n2 = ch->counts[CHET_V2];
644 strncpy(vparams.cvp_label2,vendor_labels[1],16);
645 }
646 if (ch->counts[CHET_V3]) {
647 vparams.cvp_n3 = ch->counts[CHET_V3];
648 strncpy(vparams.cvp_label3,vendor_labels[2],16);
649 }
650 if (ch->counts[CHET_V4]) {
651 vparams.cvp_n4 = ch->counts[CHET_V4];
652 strncpy(vparams.cvp_label4,vendor_labels[3],16);
653 }
654 if (copy_to_user(argp, &vparams, sizeof(vparams)))
655 return -EFAULT;
656 return 0;
657 }
658
659 case CHIOPOSITION:
660 {
661 struct changer_position pos;
662
663 if (copy_from_user(&pos, argp, sizeof (pos)))
664 return -EFAULT;
665
666 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
667 DPRINTK("CHIOPOSITION: invalid parameter\n");
668 return -EBADSLT;
669 }
670 mutex_lock(&ch->lock);
671 retval = ch_position(ch,0,
672 ch->firsts[pos.cp_type] + pos.cp_unit,
673 pos.cp_flags & CP_INVERT);
674 mutex_unlock(&ch->lock);
675 return retval;
676 }
677
678 case CHIOMOVE:
679 {
680 struct changer_move mv;
681
682 if (copy_from_user(&mv, argp, sizeof (mv)))
683 return -EFAULT;
684
685 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
686 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
687 DPRINTK("CHIOMOVE: invalid parameter\n");
688 return -EBADSLT;
689 }
690
691 mutex_lock(&ch->lock);
692 retval = ch_move(ch,0,
693 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
694 ch->firsts[mv.cm_totype] + mv.cm_tounit,
695 mv.cm_flags & CM_INVERT);
696 mutex_unlock(&ch->lock);
697 return retval;
698 }
699
700 case CHIOEXCHANGE:
701 {
702 struct changer_exchange mv;
703
704 if (copy_from_user(&mv, argp, sizeof (mv)))
705 return -EFAULT;
706
707 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
708 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
709 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
710 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
711 return -EBADSLT;
712 }
713
714 mutex_lock(&ch->lock);
715 retval = ch_exchange
716 (ch,0,
717 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
718 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
719 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
720 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
721 mutex_unlock(&ch->lock);
722 return retval;
723 }
724
725 case CHIOGSTATUS:
726 {
727 struct changer_element_status ces;
728
729 if (copy_from_user(&ces, argp, sizeof (ces)))
730 return -EFAULT;
731 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
732 return -EINVAL;
733
734 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
735 }
736
737 case CHIOGELEM:
738 {
739 struct changer_get_element cge;
740 u_char ch_cmd[12];
741 u_char *buffer;
742 unsigned int elem;
743 int result,i;
744
745 if (copy_from_user(&cge, argp, sizeof (cge)))
746 return -EFAULT;
747
748 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
749 return -EINVAL;
750 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
751
752 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
753 if (!buffer)
754 return -ENOMEM;
755 mutex_lock(&ch->lock);
756
757 voltag_retry:
758 memset(ch_cmd, 0, sizeof(ch_cmd));
759 ch_cmd[0] = READ_ELEMENT_STATUS;
760 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
761 (ch->voltags ? 0x10 : 0) |
762 ch_elem_to_typecode(ch,elem);
763 ch_cmd[2] = (elem >> 8) & 0xff;
764 ch_cmd[3] = elem & 0xff;
765 ch_cmd[5] = 1;
766 ch_cmd[9] = 255;
767
768 result = ch_do_scsi(ch, ch_cmd, 12,
769 buffer, 256, DMA_FROM_DEVICE);
770 if (!result) {
771 cge.cge_status = buffer[18];
772 cge.cge_flags = 0;
773 if (buffer[18] & CESTATUS_EXCEPT) {
774 cge.cge_errno = EIO;
775 }
776 if (buffer[25] & 0x80) {
777 cge.cge_flags |= CGE_SRC;
778 if (buffer[25] & 0x40)
779 cge.cge_flags |= CGE_INVERT;
780 elem = (buffer[26]<<8) | buffer[27];
781 for (i = 0; i < 4; i++) {
782 if (elem >= ch->firsts[i] &&
783 elem < ch->firsts[i] + ch->counts[i]) {
784 cge.cge_srctype = i;
785 cge.cge_srcunit = elem-ch->firsts[i];
786 }
787 }
788 }
789 if ((buffer[22] & 0x30) == 0x30) {
790 cge.cge_flags |= CGE_IDLUN;
791 cge.cge_id = buffer[23];
792 cge.cge_lun = buffer[22] & 7;
793 }
794 if (buffer[9] & 0x80) {
795 cge.cge_flags |= CGE_PVOLTAG;
796 memcpy(cge.cge_pvoltag,buffer+28,36);
797 }
798 if (buffer[9] & 0x40) {
799 cge.cge_flags |= CGE_AVOLTAG;
800 memcpy(cge.cge_avoltag,buffer+64,36);
801 }
802 } else if (ch->voltags) {
803 ch->voltags = 0;
804 VPRINTK(KERN_INFO, "device has no volume tag support\n");
805 goto voltag_retry;
806 }
807 kfree(buffer);
808 mutex_unlock(&ch->lock);
809
810 if (copy_to_user(argp, &cge, sizeof (cge)))
811 return -EFAULT;
812 return result;
813 }
814
815 case CHIOINITELEM:
816 {
817 mutex_lock(&ch->lock);
818 retval = ch_init_elem(ch);
819 mutex_unlock(&ch->lock);
820 return retval;
821 }
822
823 case CHIOSVOLTAG:
824 {
825 struct changer_set_voltag csv;
826 int elem;
827
828 if (copy_from_user(&csv, argp, sizeof(csv)))
829 return -EFAULT;
830
831 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
832 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
833 return -EBADSLT;
834 }
835 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
836 mutex_lock(&ch->lock);
837 retval = ch_set_voltag(ch, elem,
838 csv.csv_flags & CSV_AVOLTAG,
839 csv.csv_flags & CSV_CLEARTAG,
840 csv.csv_voltag);
841 mutex_unlock(&ch->lock);
842 return retval;
843 }
844
845 default:
846 return scsi_ioctl(ch->device, cmd, argp);
847
848 }
849}
850
851#ifdef CONFIG_COMPAT
852
853struct changer_element_status32 {
854 int ces_type;
855 compat_uptr_t ces_data;
856};
857#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
858
859static long ch_ioctl_compat(struct file * file,
860 unsigned int cmd, unsigned long arg)
861{
862 scsi_changer *ch = file->private_data;
863
864 switch (cmd) {
865 case CHIOGPARAMS:
866 case CHIOGVPARAMS:
867 case CHIOPOSITION:
868 case CHIOMOVE:
869 case CHIOEXCHANGE:
870 case CHIOGELEM:
871 case CHIOINITELEM:
872 case CHIOSVOLTAG:
873 /* compatible */
874 return ch_ioctl(file, cmd, arg);
875 case CHIOGSTATUS32:
876 {
877 struct changer_element_status32 ces32;
878 unsigned char __user *data;
879
880 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
881 return -EFAULT;
882 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
883 return -EINVAL;
884
885 data = compat_ptr(ces32.ces_data);
886 return ch_gstatus(ch, ces32.ces_type, data);
887 }
888 default:
889 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
890 return -ENOIOCTLCMD;
891
892 }
893}
894#endif
895
896/* ------------------------------------------------------------------------ */
897
898static int ch_probe(struct device *dev)
899{
900 struct scsi_device *sd = to_scsi_device(dev);
901 struct device *class_dev;
902 int ret;
903 scsi_changer *ch;
904
905 if (sd->type != TYPE_MEDIUM_CHANGER)
906 return -ENODEV;
907
908 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
909 if (NULL == ch)
910 return -ENOMEM;
911
912 idr_preload(GFP_KERNEL);
913 spin_lock(&ch_index_lock);
914 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
915 spin_unlock(&ch_index_lock);
916 idr_preload_end();
917
918 if (ret < 0) {
919 if (ret == -ENOSPC)
920 ret = -ENODEV;
921 goto free_ch;
922 }
923
924 ch->minor = ret;
925 sprintf(ch->name,"ch%d",ch->minor);
926
927 class_dev = device_create(ch_sysfs_class, dev,
928 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
929 "s%s", ch->name);
930 if (IS_ERR(class_dev)) {
931 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
932 ch->minor);
933 ret = PTR_ERR(class_dev);
934 goto remove_idr;
935 }
936
937 mutex_init(&ch->lock);
938 ch->device = sd;
939 ch_readconfig(ch);
940 if (init)
941 ch_init_elem(ch);
942
943 dev_set_drvdata(dev, ch);
944 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
945
946 return 0;
947remove_idr:
948 idr_remove(&ch_index_idr, ch->minor);
949free_ch:
950 kfree(ch);
951 return ret;
952}
953
954static int ch_remove(struct device *dev)
955{
956 scsi_changer *ch = dev_get_drvdata(dev);
957
958 spin_lock(&ch_index_lock);
959 idr_remove(&ch_index_idr, ch->minor);
960 spin_unlock(&ch_index_lock);
961
962 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
963 kfree(ch->dt);
964 kfree(ch);
965 return 0;
966}
967
968static struct scsi_driver ch_template = {
969 .gendrv = {
970 .name = "ch",
971 .owner = THIS_MODULE,
972 .probe = ch_probe,
973 .remove = ch_remove,
974 },
975};
976
977static const struct file_operations changer_fops = {
978 .owner = THIS_MODULE,
979 .open = ch_open,
980 .release = ch_release,
981 .unlocked_ioctl = ch_ioctl,
982#ifdef CONFIG_COMPAT
983 .compat_ioctl = ch_ioctl_compat,
984#endif
985 .llseek = noop_llseek,
986};
987
988static int __init init_ch_module(void)
989{
990 int rc;
991
992 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
993 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
994 if (IS_ERR(ch_sysfs_class)) {
995 rc = PTR_ERR(ch_sysfs_class);
996 return rc;
997 }
998 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
999 if (rc < 0) {
1000 printk("Unable to get major %d for SCSI-Changer\n",
1001 SCSI_CHANGER_MAJOR);
1002 goto fail1;
1003 }
1004 rc = scsi_register_driver(&ch_template.gendrv);
1005 if (rc < 0)
1006 goto fail2;
1007 return 0;
1008
1009 fail2:
1010 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1011 fail1:
1012 class_destroy(ch_sysfs_class);
1013 return rc;
1014}
1015
1016static void __exit exit_ch_module(void)
1017{
1018 scsi_unregister_driver(&ch_template.gendrv);
1019 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1020 class_destroy(ch_sysfs_class);
1021 idr_destroy(&ch_index_idr);
1022}
1023
1024module_init(init_ch_module);
1025module_exit(exit_ch_module);
1026
1027/*
1028 * Local variables:
1029 * c-basic-offset: 8
1030 * End:
1031 */
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/slab.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 DEFINE_MUTEX(ch_mutex);
47static int init = 1;
48module_param(init, int, 0444);
49MODULE_PARM_DESC(init, \
50 "initialize element status on driver load (default: on)");
51
52static int timeout_move = 300;
53module_param(timeout_move, int, 0644);
54MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55 "(default: 300 seconds)");
56
57static int timeout_init = 3600;
58module_param(timeout_init, int, 0644);
59MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60 "(default: 3600 seconds)");
61
62static int verbose = 1;
63module_param(verbose, int, 0644);
64MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66static int debug = 0;
67module_param(debug, int, 0644);
68MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69 "detailed sense codes on scsi errors (default: off)");
70
71static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72static int dt_lun[CH_DT_MAX];
73module_param_array(dt_id, int, NULL, 0444);
74module_param_array(dt_lun, int, NULL, 0444);
75
76/* tell the driver about vendor-specific slots */
77static int vendor_firsts[CH_TYPES-4];
78static int vendor_counts[CH_TYPES-4];
79module_param_array(vendor_firsts, int, NULL, 0444);
80module_param_array(vendor_counts, int, NULL, 0444);
81
82static const char * vendor_labels[CH_TYPES-4] = {
83 "v0", "v1", "v2", "v3"
84};
85// module_param_string_array(vendor_labels, NULL, 0444);
86
87#define ch_printk(prefix, ch, fmt, a...) \
88 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
89
90#define DPRINTK(fmt, arg...) \
91do { \
92 if (debug) \
93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
94} while (0)
95#define VPRINTK(level, fmt, arg...) \
96do { \
97 if (verbose) \
98 ch_printk(level, ch, fmt, ##arg); \
99} while (0)
100
101/* ------------------------------------------------------------------- */
102
103#define MAX_RETRIES 1
104
105static struct class * ch_sysfs_class;
106
107typedef struct {
108 struct kref ref;
109 struct list_head list;
110 int minor;
111 char name[8];
112 struct scsi_device *device;
113 struct scsi_device **dt; /* ptrs to data transfer elements */
114 u_int firsts[CH_TYPES];
115 u_int counts[CH_TYPES];
116 u_int unit_attention;
117 u_int voltags;
118 struct mutex lock;
119} scsi_changer;
120
121static DEFINE_IDR(ch_index_idr);
122static DEFINE_SPINLOCK(ch_index_lock);
123
124static const struct {
125 unsigned char sense;
126 unsigned char asc;
127 unsigned char ascq;
128 int errno;
129} ch_err[] = {
130/* Just filled in what looks right. Hav'nt checked any standard paper for
131 these errno assignments, so they may be wrong... */
132 {
133 .sense = ILLEGAL_REQUEST,
134 .asc = 0x21,
135 .ascq = 0x01,
136 .errno = EBADSLT, /* Invalid element address */
137 },{
138 .sense = ILLEGAL_REQUEST,
139 .asc = 0x28,
140 .ascq = 0x01,
141 .errno = EBADE, /* Import or export element accessed */
142 },{
143 .sense = ILLEGAL_REQUEST,
144 .asc = 0x3B,
145 .ascq = 0x0D,
146 .errno = EXFULL, /* Medium destination element full */
147 },{
148 .sense = ILLEGAL_REQUEST,
149 .asc = 0x3B,
150 .ascq = 0x0E,
151 .errno = EBADE, /* Medium source element empty */
152 },{
153 .sense = ILLEGAL_REQUEST,
154 .asc = 0x20,
155 .ascq = 0x00,
156 .errno = EBADRQC, /* Invalid command operation code */
157 },{
158 /* end of list */
159 }
160};
161
162/* ------------------------------------------------------------------- */
163
164static int ch_find_errno(struct scsi_sense_hdr *sshdr)
165{
166 int i,errno = 0;
167
168 /* Check to see if additional sense information is available */
169 if (scsi_sense_valid(sshdr) &&
170 sshdr->asc != 0) {
171 for (i = 0; ch_err[i].errno != 0; i++) {
172 if (ch_err[i].sense == sshdr->sense_key &&
173 ch_err[i].asc == sshdr->asc &&
174 ch_err[i].ascq == sshdr->ascq) {
175 errno = -ch_err[i].errno;
176 break;
177 }
178 }
179 }
180 if (errno == 0)
181 errno = -EIO;
182 return errno;
183}
184
185static int
186ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
187 void *buffer, unsigned buflength,
188 enum dma_data_direction direction)
189{
190 int errno, retries = 0, timeout, result;
191 struct scsi_sense_hdr sshdr;
192
193 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
194 ? timeout_init : timeout_move;
195
196 retry:
197 errno = 0;
198 result = scsi_execute_req(ch->device, cmd, direction, buffer,
199 buflength, &sshdr, timeout * HZ,
200 MAX_RETRIES, NULL);
201
202 if (driver_byte(result) & DRIVER_SENSE) {
203 if (debug)
204 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
205 errno = ch_find_errno(&sshdr);
206
207 switch(sshdr.sense_key) {
208 case UNIT_ATTENTION:
209 ch->unit_attention = 1;
210 if (retries++ < 3)
211 goto retry;
212 break;
213 }
214 }
215 return errno;
216}
217
218/* ------------------------------------------------------------------------ */
219
220static int
221ch_elem_to_typecode(scsi_changer *ch, u_int elem)
222{
223 int i;
224
225 for (i = 0; i < CH_TYPES; i++) {
226 if (elem >= ch->firsts[i] &&
227 elem < ch->firsts[i] +
228 ch->counts[i])
229 return i+1;
230 }
231 return 0;
232}
233
234static int
235ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
236{
237 u_char cmd[12];
238 u_char *buffer;
239 int result;
240
241 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
242 if(!buffer)
243 return -ENOMEM;
244
245 retry:
246 memset(cmd,0,sizeof(cmd));
247 cmd[0] = READ_ELEMENT_STATUS;
248 cmd[1] = ((ch->device->lun & 0x7) << 5) |
249 (ch->voltags ? 0x10 : 0) |
250 ch_elem_to_typecode(ch,elem);
251 cmd[2] = (elem >> 8) & 0xff;
252 cmd[3] = elem & 0xff;
253 cmd[5] = 1;
254 cmd[9] = 255;
255 if (0 == (result = ch_do_scsi(ch, cmd, 12,
256 buffer, 256, DMA_FROM_DEVICE))) {
257 if (((buffer[16] << 8) | buffer[17]) != elem) {
258 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
259 elem,(buffer[16] << 8) | buffer[17]);
260 kfree(buffer);
261 return -EIO;
262 }
263 memcpy(data,buffer+16,16);
264 } else {
265 if (ch->voltags) {
266 ch->voltags = 0;
267 VPRINTK(KERN_INFO, "device has no volume tag support\n");
268 goto retry;
269 }
270 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
271 }
272 kfree(buffer);
273 return result;
274}
275
276static int
277ch_init_elem(scsi_changer *ch)
278{
279 int err;
280 u_char cmd[6];
281
282 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
283 memset(cmd,0,sizeof(cmd));
284 cmd[0] = INITIALIZE_ELEMENT_STATUS;
285 cmd[1] = (ch->device->lun & 0x7) << 5;
286 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
287 VPRINTK(KERN_INFO, "... finished\n");
288 return err;
289}
290
291static int
292ch_readconfig(scsi_changer *ch)
293{
294 u_char cmd[10], data[16];
295 u_char *buffer;
296 int result,id,lun,i;
297 u_int elem;
298
299 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
300 if (!buffer)
301 return -ENOMEM;
302
303 memset(cmd,0,sizeof(cmd));
304 cmd[0] = MODE_SENSE;
305 cmd[1] = (ch->device->lun & 0x7) << 5;
306 cmd[2] = 0x1d;
307 cmd[4] = 255;
308 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
309 if (0 != result) {
310 cmd[1] |= (1<<3);
311 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
312 }
313 if (0 == result) {
314 ch->firsts[CHET_MT] =
315 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
316 ch->counts[CHET_MT] =
317 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
318 ch->firsts[CHET_ST] =
319 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
320 ch->counts[CHET_ST] =
321 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
322 ch->firsts[CHET_IE] =
323 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
324 ch->counts[CHET_IE] =
325 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
326 ch->firsts[CHET_DT] =
327 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
328 ch->counts[CHET_DT] =
329 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
330 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
331 ch->firsts[CHET_MT],
332 ch->counts[CHET_MT]);
333 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
334 ch->firsts[CHET_ST],
335 ch->counts[CHET_ST]);
336 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
337 ch->firsts[CHET_IE],
338 ch->counts[CHET_IE]);
339 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
340 ch->firsts[CHET_DT],
341 ch->counts[CHET_DT]);
342 } else {
343 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
344 }
345
346 /* vendor specific element types */
347 for (i = 0; i < 4; i++) {
348 if (0 == vendor_counts[i])
349 continue;
350 if (NULL == vendor_labels[i])
351 continue;
352 ch->firsts[CHET_V1+i] = vendor_firsts[i];
353 ch->counts[CHET_V1+i] = vendor_counts[i];
354 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
355 i+5,i+1,vendor_firsts[i],vendor_counts[i],
356 vendor_labels[i]);
357 }
358
359 /* look up the devices of the data transfer elements */
360 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
361 GFP_KERNEL);
362
363 if (!ch->dt) {
364 kfree(buffer);
365 return -ENOMEM;
366 }
367
368 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
369 id = -1;
370 lun = 0;
371 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
372 id = dt_id[elem];
373 lun = dt_lun[elem];
374 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
375 elem+ch->firsts[CHET_DT]);
376 } else if (0 != ch_read_element_status
377 (ch,elem+ch->firsts[CHET_DT],data)) {
378 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
379 elem+ch->firsts[CHET_DT]);
380 } else {
381 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
382 if (data[6] & 0x80) {
383 VPRINTK(KERN_CONT, "not this SCSI bus\n");
384 ch->dt[elem] = NULL;
385 } else if (0 == (data[6] & 0x30)) {
386 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
387 ch->dt[elem] = NULL;
388 } else {
389 id = ch->device->id;
390 lun = 0;
391 if (data[6] & 0x20) id = data[7];
392 if (data[6] & 0x10) lun = data[6] & 7;
393 }
394 }
395 if (-1 != id) {
396 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
397 ch->dt[elem] =
398 scsi_device_lookup(ch->device->host,
399 ch->device->channel,
400 id,lun);
401 if (!ch->dt[elem]) {
402 /* should not happen */
403 VPRINTK(KERN_CONT, "Huh? device not found!\n");
404 } else {
405 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
406 ch->dt[elem]->vendor,
407 ch->dt[elem]->model,
408 ch->dt[elem]->rev);
409 }
410 }
411 }
412 ch->voltags = 1;
413 kfree(buffer);
414
415 return 0;
416}
417
418/* ------------------------------------------------------------------------ */
419
420static int
421ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
422{
423 u_char cmd[10];
424
425 DPRINTK("position: 0x%x\n",elem);
426 if (0 == trans)
427 trans = ch->firsts[CHET_MT];
428 memset(cmd,0,sizeof(cmd));
429 cmd[0] = POSITION_TO_ELEMENT;
430 cmd[1] = (ch->device->lun & 0x7) << 5;
431 cmd[2] = (trans >> 8) & 0xff;
432 cmd[3] = trans & 0xff;
433 cmd[4] = (elem >> 8) & 0xff;
434 cmd[5] = elem & 0xff;
435 cmd[8] = rotate ? 1 : 0;
436 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
437}
438
439static int
440ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
441{
442 u_char cmd[12];
443
444 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
445 if (0 == trans)
446 trans = ch->firsts[CHET_MT];
447 memset(cmd,0,sizeof(cmd));
448 cmd[0] = MOVE_MEDIUM;
449 cmd[1] = (ch->device->lun & 0x7) << 5;
450 cmd[2] = (trans >> 8) & 0xff;
451 cmd[3] = trans & 0xff;
452 cmd[4] = (src >> 8) & 0xff;
453 cmd[5] = src & 0xff;
454 cmd[6] = (dest >> 8) & 0xff;
455 cmd[7] = dest & 0xff;
456 cmd[10] = rotate ? 1 : 0;
457 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
458}
459
460static int
461ch_exchange(scsi_changer *ch, u_int trans, u_int src,
462 u_int dest1, u_int dest2, int rotate1, int rotate2)
463{
464 u_char cmd[12];
465
466 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
467 src,dest1,dest2);
468 if (0 == trans)
469 trans = ch->firsts[CHET_MT];
470 memset(cmd,0,sizeof(cmd));
471 cmd[0] = EXCHANGE_MEDIUM;
472 cmd[1] = (ch->device->lun & 0x7) << 5;
473 cmd[2] = (trans >> 8) & 0xff;
474 cmd[3] = trans & 0xff;
475 cmd[4] = (src >> 8) & 0xff;
476 cmd[5] = src & 0xff;
477 cmd[6] = (dest1 >> 8) & 0xff;
478 cmd[7] = dest1 & 0xff;
479 cmd[8] = (dest2 >> 8) & 0xff;
480 cmd[9] = dest2 & 0xff;
481 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
482
483 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
484}
485
486static void
487ch_check_voltag(char *tag)
488{
489 int i;
490
491 for (i = 0; i < 32; i++) {
492 /* restrict to ascii */
493 if (tag[i] >= 0x7f || tag[i] < 0x20)
494 tag[i] = ' ';
495 /* don't allow search wildcards */
496 if (tag[i] == '?' ||
497 tag[i] == '*')
498 tag[i] = ' ';
499 }
500}
501
502static int
503ch_set_voltag(scsi_changer *ch, u_int elem,
504 int alternate, int clear, u_char *tag)
505{
506 u_char cmd[12];
507 u_char *buffer;
508 int result;
509
510 buffer = kzalloc(512, GFP_KERNEL);
511 if (!buffer)
512 return -ENOMEM;
513
514 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
515 clear ? "clear" : "set",
516 alternate ? "alternate" : "primary",
517 elem, tag);
518 memset(cmd,0,sizeof(cmd));
519 cmd[0] = SEND_VOLUME_TAG;
520 cmd[1] = ((ch->device->lun & 0x7) << 5) |
521 ch_elem_to_typecode(ch,elem);
522 cmd[2] = (elem >> 8) & 0xff;
523 cmd[3] = elem & 0xff;
524 cmd[5] = clear
525 ? (alternate ? 0x0d : 0x0c)
526 : (alternate ? 0x0b : 0x0a);
527
528 cmd[9] = 255;
529
530 memcpy(buffer,tag,32);
531 ch_check_voltag(buffer);
532
533 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
534 kfree(buffer);
535 return result;
536}
537
538static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
539{
540 int retval = 0;
541 u_char data[16];
542 unsigned int i;
543
544 mutex_lock(&ch->lock);
545 for (i = 0; i < ch->counts[type]; i++) {
546 if (0 != ch_read_element_status
547 (ch, ch->firsts[type]+i,data)) {
548 retval = -EIO;
549 break;
550 }
551 put_user(data[2], dest+i);
552 if (data[2] & CESTATUS_EXCEPT)
553 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
554 ch->firsts[type]+i,
555 (int)data[4],(int)data[5]);
556 retval = ch_read_element_status
557 (ch, ch->firsts[type]+i,data);
558 if (0 != retval)
559 break;
560 }
561 mutex_unlock(&ch->lock);
562 return retval;
563}
564
565/* ------------------------------------------------------------------------ */
566
567static void ch_destroy(struct kref *ref)
568{
569 scsi_changer *ch = container_of(ref, scsi_changer, ref);
570
571 kfree(ch->dt);
572 kfree(ch);
573}
574
575static int
576ch_release(struct inode *inode, struct file *file)
577{
578 scsi_changer *ch = file->private_data;
579
580 scsi_device_put(ch->device);
581 ch->device = NULL;
582 file->private_data = NULL;
583 kref_put(&ch->ref, ch_destroy);
584 return 0;
585}
586
587static int
588ch_open(struct inode *inode, struct file *file)
589{
590 scsi_changer *ch;
591 int minor = iminor(inode);
592
593 mutex_lock(&ch_mutex);
594 spin_lock(&ch_index_lock);
595 ch = idr_find(&ch_index_idr, minor);
596
597 if (NULL == ch || scsi_device_get(ch->device)) {
598 spin_unlock(&ch_index_lock);
599 mutex_unlock(&ch_mutex);
600 return -ENXIO;
601 }
602 kref_get(&ch->ref);
603 spin_unlock(&ch_index_lock);
604
605 file->private_data = ch;
606 mutex_unlock(&ch_mutex);
607 return 0;
608}
609
610static int
611ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
612{
613 if (type >= CH_TYPES || unit >= ch->counts[type])
614 return -1;
615 return 0;
616}
617
618static long ch_ioctl(struct file *file,
619 unsigned int cmd, unsigned long arg)
620{
621 scsi_changer *ch = file->private_data;
622 int retval;
623 void __user *argp = (void __user *)arg;
624
625 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
626 file->f_flags & O_NDELAY);
627 if (retval)
628 return retval;
629
630 switch (cmd) {
631 case CHIOGPARAMS:
632 {
633 struct changer_params params;
634
635 params.cp_curpicker = 0;
636 params.cp_npickers = ch->counts[CHET_MT];
637 params.cp_nslots = ch->counts[CHET_ST];
638 params.cp_nportals = ch->counts[CHET_IE];
639 params.cp_ndrives = ch->counts[CHET_DT];
640
641 if (copy_to_user(argp, ¶ms, sizeof(params)))
642 return -EFAULT;
643 return 0;
644 }
645 case CHIOGVPARAMS:
646 {
647 struct changer_vendor_params vparams;
648
649 memset(&vparams,0,sizeof(vparams));
650 if (ch->counts[CHET_V1]) {
651 vparams.cvp_n1 = ch->counts[CHET_V1];
652 strncpy(vparams.cvp_label1,vendor_labels[0],16);
653 }
654 if (ch->counts[CHET_V2]) {
655 vparams.cvp_n2 = ch->counts[CHET_V2];
656 strncpy(vparams.cvp_label2,vendor_labels[1],16);
657 }
658 if (ch->counts[CHET_V3]) {
659 vparams.cvp_n3 = ch->counts[CHET_V3];
660 strncpy(vparams.cvp_label3,vendor_labels[2],16);
661 }
662 if (ch->counts[CHET_V4]) {
663 vparams.cvp_n4 = ch->counts[CHET_V4];
664 strncpy(vparams.cvp_label4,vendor_labels[3],16);
665 }
666 if (copy_to_user(argp, &vparams, sizeof(vparams)))
667 return -EFAULT;
668 return 0;
669 }
670
671 case CHIOPOSITION:
672 {
673 struct changer_position pos;
674
675 if (copy_from_user(&pos, argp, sizeof (pos)))
676 return -EFAULT;
677
678 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
679 DPRINTK("CHIOPOSITION: invalid parameter\n");
680 return -EBADSLT;
681 }
682 mutex_lock(&ch->lock);
683 retval = ch_position(ch,0,
684 ch->firsts[pos.cp_type] + pos.cp_unit,
685 pos.cp_flags & CP_INVERT);
686 mutex_unlock(&ch->lock);
687 return retval;
688 }
689
690 case CHIOMOVE:
691 {
692 struct changer_move mv;
693
694 if (copy_from_user(&mv, argp, sizeof (mv)))
695 return -EFAULT;
696
697 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
698 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
699 DPRINTK("CHIOMOVE: invalid parameter\n");
700 return -EBADSLT;
701 }
702
703 mutex_lock(&ch->lock);
704 retval = ch_move(ch,0,
705 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
706 ch->firsts[mv.cm_totype] + mv.cm_tounit,
707 mv.cm_flags & CM_INVERT);
708 mutex_unlock(&ch->lock);
709 return retval;
710 }
711
712 case CHIOEXCHANGE:
713 {
714 struct changer_exchange mv;
715
716 if (copy_from_user(&mv, argp, sizeof (mv)))
717 return -EFAULT;
718
719 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
720 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
721 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
722 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
723 return -EBADSLT;
724 }
725
726 mutex_lock(&ch->lock);
727 retval = ch_exchange
728 (ch,0,
729 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
730 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
731 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
732 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
733 mutex_unlock(&ch->lock);
734 return retval;
735 }
736
737 case CHIOGSTATUS:
738 {
739 struct changer_element_status ces;
740
741 if (copy_from_user(&ces, argp, sizeof (ces)))
742 return -EFAULT;
743 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
744 return -EINVAL;
745
746 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
747 }
748
749 case CHIOGELEM:
750 {
751 struct changer_get_element cge;
752 u_char ch_cmd[12];
753 u_char *buffer;
754 unsigned int elem;
755 int result,i;
756
757 if (copy_from_user(&cge, argp, sizeof (cge)))
758 return -EFAULT;
759
760 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
761 return -EINVAL;
762 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
763
764 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
765 if (!buffer)
766 return -ENOMEM;
767 mutex_lock(&ch->lock);
768
769 voltag_retry:
770 memset(ch_cmd, 0, sizeof(ch_cmd));
771 ch_cmd[0] = READ_ELEMENT_STATUS;
772 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
773 (ch->voltags ? 0x10 : 0) |
774 ch_elem_to_typecode(ch,elem);
775 ch_cmd[2] = (elem >> 8) & 0xff;
776 ch_cmd[3] = elem & 0xff;
777 ch_cmd[5] = 1;
778 ch_cmd[9] = 255;
779
780 result = ch_do_scsi(ch, ch_cmd, 12,
781 buffer, 256, DMA_FROM_DEVICE);
782 if (!result) {
783 cge.cge_status = buffer[18];
784 cge.cge_flags = 0;
785 if (buffer[18] & CESTATUS_EXCEPT) {
786 cge.cge_errno = EIO;
787 }
788 if (buffer[25] & 0x80) {
789 cge.cge_flags |= CGE_SRC;
790 if (buffer[25] & 0x40)
791 cge.cge_flags |= CGE_INVERT;
792 elem = (buffer[26]<<8) | buffer[27];
793 for (i = 0; i < 4; i++) {
794 if (elem >= ch->firsts[i] &&
795 elem < ch->firsts[i] + ch->counts[i]) {
796 cge.cge_srctype = i;
797 cge.cge_srcunit = elem-ch->firsts[i];
798 }
799 }
800 }
801 if ((buffer[22] & 0x30) == 0x30) {
802 cge.cge_flags |= CGE_IDLUN;
803 cge.cge_id = buffer[23];
804 cge.cge_lun = buffer[22] & 7;
805 }
806 if (buffer[9] & 0x80) {
807 cge.cge_flags |= CGE_PVOLTAG;
808 memcpy(cge.cge_pvoltag,buffer+28,36);
809 }
810 if (buffer[9] & 0x40) {
811 cge.cge_flags |= CGE_AVOLTAG;
812 memcpy(cge.cge_avoltag,buffer+64,36);
813 }
814 } else if (ch->voltags) {
815 ch->voltags = 0;
816 VPRINTK(KERN_INFO, "device has no volume tag support\n");
817 goto voltag_retry;
818 }
819 kfree(buffer);
820 mutex_unlock(&ch->lock);
821
822 if (copy_to_user(argp, &cge, sizeof (cge)))
823 return -EFAULT;
824 return result;
825 }
826
827 case CHIOINITELEM:
828 {
829 mutex_lock(&ch->lock);
830 retval = ch_init_elem(ch);
831 mutex_unlock(&ch->lock);
832 return retval;
833 }
834
835 case CHIOSVOLTAG:
836 {
837 struct changer_set_voltag csv;
838 int elem;
839
840 if (copy_from_user(&csv, argp, sizeof(csv)))
841 return -EFAULT;
842
843 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
844 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
845 return -EBADSLT;
846 }
847 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
848 mutex_lock(&ch->lock);
849 retval = ch_set_voltag(ch, elem,
850 csv.csv_flags & CSV_AVOLTAG,
851 csv.csv_flags & CSV_CLEARTAG,
852 csv.csv_voltag);
853 mutex_unlock(&ch->lock);
854 return retval;
855 }
856
857 default:
858 return scsi_ioctl(ch->device, cmd, argp);
859
860 }
861}
862
863#ifdef CONFIG_COMPAT
864
865struct changer_element_status32 {
866 int ces_type;
867 compat_uptr_t ces_data;
868};
869#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
870
871static long ch_ioctl_compat(struct file * file,
872 unsigned int cmd, unsigned long arg)
873{
874 scsi_changer *ch = file->private_data;
875
876 switch (cmd) {
877 case CHIOGPARAMS:
878 case CHIOGVPARAMS:
879 case CHIOPOSITION:
880 case CHIOMOVE:
881 case CHIOEXCHANGE:
882 case CHIOGELEM:
883 case CHIOINITELEM:
884 case CHIOSVOLTAG:
885 /* compatible */
886 return ch_ioctl(file, cmd, arg);
887 case CHIOGSTATUS32:
888 {
889 struct changer_element_status32 ces32;
890 unsigned char __user *data;
891
892 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
893 return -EFAULT;
894 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
895 return -EINVAL;
896
897 data = compat_ptr(ces32.ces_data);
898 return ch_gstatus(ch, ces32.ces_type, data);
899 }
900 default:
901 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
902 return -ENOIOCTLCMD;
903
904 }
905}
906#endif
907
908/* ------------------------------------------------------------------------ */
909
910static int ch_probe(struct device *dev)
911{
912 struct scsi_device *sd = to_scsi_device(dev);
913 struct device *class_dev;
914 int ret;
915 scsi_changer *ch;
916
917 if (sd->type != TYPE_MEDIUM_CHANGER)
918 return -ENODEV;
919
920 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
921 if (NULL == ch)
922 return -ENOMEM;
923
924 idr_preload(GFP_KERNEL);
925 spin_lock(&ch_index_lock);
926 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
927 spin_unlock(&ch_index_lock);
928 idr_preload_end();
929
930 if (ret < 0) {
931 if (ret == -ENOSPC)
932 ret = -ENODEV;
933 goto free_ch;
934 }
935
936 ch->minor = ret;
937 sprintf(ch->name,"ch%d",ch->minor);
938
939 class_dev = device_create(ch_sysfs_class, dev,
940 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
941 "s%s", ch->name);
942 if (IS_ERR(class_dev)) {
943 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
944 ch->minor);
945 ret = PTR_ERR(class_dev);
946 goto remove_idr;
947 }
948
949 mutex_init(&ch->lock);
950 kref_init(&ch->ref);
951 ch->device = sd;
952 ret = ch_readconfig(ch);
953 if (ret)
954 goto destroy_dev;
955 if (init)
956 ch_init_elem(ch);
957
958 dev_set_drvdata(dev, ch);
959 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
960
961 return 0;
962destroy_dev:
963 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
964remove_idr:
965 idr_remove(&ch_index_idr, ch->minor);
966free_ch:
967 kfree(ch);
968 return ret;
969}
970
971static int ch_remove(struct device *dev)
972{
973 scsi_changer *ch = dev_get_drvdata(dev);
974
975 spin_lock(&ch_index_lock);
976 idr_remove(&ch_index_idr, ch->minor);
977 spin_unlock(&ch_index_lock);
978
979 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
980 kref_put(&ch->ref, ch_destroy);
981 return 0;
982}
983
984static struct scsi_driver ch_template = {
985 .gendrv = {
986 .name = "ch",
987 .owner = THIS_MODULE,
988 .probe = ch_probe,
989 .remove = ch_remove,
990 },
991};
992
993static const struct file_operations changer_fops = {
994 .owner = THIS_MODULE,
995 .open = ch_open,
996 .release = ch_release,
997 .unlocked_ioctl = ch_ioctl,
998#ifdef CONFIG_COMPAT
999 .compat_ioctl = ch_ioctl_compat,
1000#endif
1001 .llseek = noop_llseek,
1002};
1003
1004static int __init init_ch_module(void)
1005{
1006 int rc;
1007
1008 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1009 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1010 if (IS_ERR(ch_sysfs_class)) {
1011 rc = PTR_ERR(ch_sysfs_class);
1012 return rc;
1013 }
1014 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1015 if (rc < 0) {
1016 printk("Unable to get major %d for SCSI-Changer\n",
1017 SCSI_CHANGER_MAJOR);
1018 goto fail1;
1019 }
1020 rc = scsi_register_driver(&ch_template.gendrv);
1021 if (rc < 0)
1022 goto fail2;
1023 return 0;
1024
1025 fail2:
1026 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1027 fail1:
1028 class_destroy(ch_sysfs_class);
1029 return rc;
1030}
1031
1032static void __exit exit_ch_module(void)
1033{
1034 scsi_unregister_driver(&ch_template.gendrv);
1035 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1036 class_destroy(ch_sysfs_class);
1037 idr_destroy(&ch_index_idr);
1038}
1039
1040module_init(init_ch_module);
1041module_exit(exit_ch_module);
1042
1043/*
1044 * Local variables:
1045 * c-basic-offset: 8
1046 * End:
1047 */