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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SCSI Media Changer device driver for Linux 2.6
4 *
5 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
6 *
7 */
8
9#define VERSION "0.25"
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/fs.h>
14#include <linux/kernel.h>
15#include <linux/mm.h>
16#include <linux/major.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/interrupt.h>
20#include <linux/blkdev.h>
21#include <linux/completion.h>
22#include <linux/compat.h>
23#include <linux/chio.h> /* here are all the ioctls */
24#include <linux/mutex.h>
25#include <linux/idr.h>
26#include <linux/slab.h>
27
28#include <scsi/scsi.h>
29#include <scsi/scsi_cmnd.h>
30#include <scsi/scsi_driver.h>
31#include <scsi/scsi_ioctl.h>
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_eh.h>
35#include <scsi/scsi_dbg.h>
36
37#define CH_DT_MAX 16
38#define CH_TYPES 8
39#define CH_MAX_DEVS 128
40
41MODULE_DESCRIPTION("device driver for scsi media changer devices");
42MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
43MODULE_LICENSE("GPL");
44MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
45MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
46
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;
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 int buflength, enum req_op op)
188{
189 int errno, retries = 0, timeout, result;
190 struct scsi_sense_hdr sshdr;
191 const struct scsi_exec_args exec_args = {
192 .sshdr = &sshdr,
193 };
194
195 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
196 ? timeout_init : timeout_move;
197
198 retry:
199 errno = 0;
200 result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength,
201 timeout * HZ, MAX_RETRIES, &exec_args);
202 if (result < 0)
203 return result;
204 if (scsi_sense_valid(&sshdr)) {
205 if (debug)
206 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
207 errno = ch_find_errno(&sshdr);
208
209 switch(sshdr.sense_key) {
210 case UNIT_ATTENTION:
211 ch->unit_attention = 1;
212 if (retries++ < 3)
213 goto retry;
214 break;
215 }
216 }
217 return errno;
218}
219
220/* ------------------------------------------------------------------------ */
221
222static int
223ch_elem_to_typecode(scsi_changer *ch, u_int elem)
224{
225 int i;
226
227 for (i = 0; i < CH_TYPES; i++) {
228 if (elem >= ch->firsts[i] &&
229 elem < ch->firsts[i] +
230 ch->counts[i])
231 return i+1;
232 }
233 return 0;
234}
235
236static int
237ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
238{
239 u_char cmd[12];
240 u_char *buffer;
241 int result;
242
243 buffer = kmalloc(512, GFP_KERNEL);
244 if(!buffer)
245 return -ENOMEM;
246
247 retry:
248 memset(cmd,0,sizeof(cmd));
249 cmd[0] = READ_ELEMENT_STATUS;
250 cmd[1] = ((ch->device->lun & 0x7) << 5) |
251 (ch->voltags ? 0x10 : 0) |
252 ch_elem_to_typecode(ch,elem);
253 cmd[2] = (elem >> 8) & 0xff;
254 cmd[3] = elem & 0xff;
255 cmd[5] = 1;
256 cmd[9] = 255;
257 if (0 == (result = ch_do_scsi(ch, cmd, 12,
258 buffer, 256, REQ_OP_DRV_IN))) {
259 if (((buffer[16] << 8) | buffer[17]) != elem) {
260 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
261 elem,(buffer[16] << 8) | buffer[17]);
262 kfree(buffer);
263 return -EIO;
264 }
265 memcpy(data,buffer+16,16);
266 } else {
267 if (ch->voltags) {
268 ch->voltags = 0;
269 VPRINTK(KERN_INFO, "device has no volume tag support\n");
270 goto retry;
271 }
272 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
273 }
274 kfree(buffer);
275 return result;
276}
277
278static int
279ch_init_elem(scsi_changer *ch)
280{
281 int err;
282 u_char cmd[6];
283
284 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
285 memset(cmd,0,sizeof(cmd));
286 cmd[0] = INITIALIZE_ELEMENT_STATUS;
287 cmd[1] = (ch->device->lun & 0x7) << 5;
288 err = ch_do_scsi(ch, cmd, 6, NULL, 0, REQ_OP_DRV_IN);
289 VPRINTK(KERN_INFO, "... finished\n");
290 return err;
291}
292
293static int
294ch_readconfig(scsi_changer *ch)
295{
296 u_char cmd[10], data[16];
297 u_char *buffer;
298 int result,id,lun,i;
299 u_int elem;
300
301 buffer = kzalloc(512, GFP_KERNEL);
302 if (!buffer)
303 return -ENOMEM;
304
305 memset(cmd,0,sizeof(cmd));
306 cmd[0] = MODE_SENSE;
307 cmd[1] = (ch->device->lun & 0x7) << 5;
308 cmd[2] = 0x1d;
309 cmd[4] = 255;
310 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);
311 if (0 != result) {
312 cmd[1] |= (1<<3);
313 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);
314 }
315 if (0 == result) {
316 ch->firsts[CHET_MT] =
317 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
318 ch->counts[CHET_MT] =
319 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
320 ch->firsts[CHET_ST] =
321 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
322 ch->counts[CHET_ST] =
323 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
324 ch->firsts[CHET_IE] =
325 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
326 ch->counts[CHET_IE] =
327 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
328 ch->firsts[CHET_DT] =
329 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
330 ch->counts[CHET_DT] =
331 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
332 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
333 ch->firsts[CHET_MT],
334 ch->counts[CHET_MT]);
335 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
336 ch->firsts[CHET_ST],
337 ch->counts[CHET_ST]);
338 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
339 ch->firsts[CHET_IE],
340 ch->counts[CHET_IE]);
341 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
342 ch->firsts[CHET_DT],
343 ch->counts[CHET_DT]);
344 } else {
345 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
346 }
347
348 /* vendor specific element types */
349 for (i = 0; i < 4; i++) {
350 if (0 == vendor_counts[i])
351 continue;
352 if (NULL == vendor_labels[i])
353 continue;
354 ch->firsts[CHET_V1+i] = vendor_firsts[i];
355 ch->counts[CHET_V1+i] = vendor_counts[i];
356 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
357 i+5,i+1,vendor_firsts[i],vendor_counts[i],
358 vendor_labels[i]);
359 }
360
361 /* look up the devices of the data transfer elements */
362 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
363 GFP_KERNEL);
364
365 if (!ch->dt) {
366 kfree(buffer);
367 return -ENOMEM;
368 }
369
370 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
371 id = -1;
372 lun = 0;
373 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
374 id = dt_id[elem];
375 lun = dt_lun[elem];
376 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
377 elem+ch->firsts[CHET_DT]);
378 } else if (0 != ch_read_element_status
379 (ch,elem+ch->firsts[CHET_DT],data)) {
380 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
381 elem+ch->firsts[CHET_DT]);
382 } else {
383 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
384 if (data[6] & 0x80) {
385 VPRINTK(KERN_CONT, "not this SCSI bus\n");
386 ch->dt[elem] = NULL;
387 } else if (0 == (data[6] & 0x30)) {
388 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
389 ch->dt[elem] = NULL;
390 } else {
391 id = ch->device->id;
392 lun = 0;
393 if (data[6] & 0x20) id = data[7];
394 if (data[6] & 0x10) lun = data[6] & 7;
395 }
396 }
397 if (-1 != id) {
398 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
399 ch->dt[elem] =
400 scsi_device_lookup(ch->device->host,
401 ch->device->channel,
402 id,lun);
403 if (!ch->dt[elem]) {
404 /* should not happen */
405 VPRINTK(KERN_CONT, "Huh? device not found!\n");
406 } else {
407 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
408 ch->dt[elem]->vendor,
409 ch->dt[elem]->model,
410 ch->dt[elem]->rev);
411 }
412 }
413 }
414 ch->voltags = 1;
415 kfree(buffer);
416
417 return 0;
418}
419
420/* ------------------------------------------------------------------------ */
421
422static int
423ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
424{
425 u_char cmd[10];
426
427 DPRINTK("position: 0x%x\n",elem);
428 if (0 == trans)
429 trans = ch->firsts[CHET_MT];
430 memset(cmd,0,sizeof(cmd));
431 cmd[0] = POSITION_TO_ELEMENT;
432 cmd[1] = (ch->device->lun & 0x7) << 5;
433 cmd[2] = (trans >> 8) & 0xff;
434 cmd[3] = trans & 0xff;
435 cmd[4] = (elem >> 8) & 0xff;
436 cmd[5] = elem & 0xff;
437 cmd[8] = rotate ? 1 : 0;
438 return ch_do_scsi(ch, cmd, 10, NULL, 0, REQ_OP_DRV_IN);
439}
440
441static int
442ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
443{
444 u_char cmd[12];
445
446 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
447 if (0 == trans)
448 trans = ch->firsts[CHET_MT];
449 memset(cmd,0,sizeof(cmd));
450 cmd[0] = MOVE_MEDIUM;
451 cmd[1] = (ch->device->lun & 0x7) << 5;
452 cmd[2] = (trans >> 8) & 0xff;
453 cmd[3] = trans & 0xff;
454 cmd[4] = (src >> 8) & 0xff;
455 cmd[5] = src & 0xff;
456 cmd[6] = (dest >> 8) & 0xff;
457 cmd[7] = dest & 0xff;
458 cmd[10] = rotate ? 1 : 0;
459 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN);
460}
461
462static int
463ch_exchange(scsi_changer *ch, u_int trans, u_int src,
464 u_int dest1, u_int dest2, int rotate1, int rotate2)
465{
466 u_char cmd[12];
467
468 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
469 src,dest1,dest2);
470 if (0 == trans)
471 trans = ch->firsts[CHET_MT];
472 memset(cmd,0,sizeof(cmd));
473 cmd[0] = EXCHANGE_MEDIUM;
474 cmd[1] = (ch->device->lun & 0x7) << 5;
475 cmd[2] = (trans >> 8) & 0xff;
476 cmd[3] = trans & 0xff;
477 cmd[4] = (src >> 8) & 0xff;
478 cmd[5] = src & 0xff;
479 cmd[6] = (dest1 >> 8) & 0xff;
480 cmd[7] = dest1 & 0xff;
481 cmd[8] = (dest2 >> 8) & 0xff;
482 cmd[9] = dest2 & 0xff;
483 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
484
485 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN);
486}
487
488static void
489ch_check_voltag(char *tag)
490{
491 int i;
492
493 for (i = 0; i < 32; i++) {
494 /* restrict to ascii */
495 if (tag[i] >= 0x7f || tag[i] < 0x20)
496 tag[i] = ' ';
497 /* don't allow search wildcards */
498 if (tag[i] == '?' ||
499 tag[i] == '*')
500 tag[i] = ' ';
501 }
502}
503
504static int
505ch_set_voltag(scsi_changer *ch, u_int elem,
506 int alternate, int clear, u_char *tag)
507{
508 u_char cmd[12];
509 u_char *buffer;
510 int result;
511
512 buffer = kzalloc(512, GFP_KERNEL);
513 if (!buffer)
514 return -ENOMEM;
515
516 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
517 clear ? "clear" : "set",
518 alternate ? "alternate" : "primary",
519 elem, tag);
520 memset(cmd,0,sizeof(cmd));
521 cmd[0] = SEND_VOLUME_TAG;
522 cmd[1] = ((ch->device->lun & 0x7) << 5) |
523 ch_elem_to_typecode(ch,elem);
524 cmd[2] = (elem >> 8) & 0xff;
525 cmd[3] = elem & 0xff;
526 cmd[5] = clear
527 ? (alternate ? 0x0d : 0x0c)
528 : (alternate ? 0x0b : 0x0a);
529
530 cmd[9] = 255;
531
532 memcpy(buffer,tag,32);
533 ch_check_voltag(buffer);
534
535 result = ch_do_scsi(ch, cmd, 12, buffer, 256, REQ_OP_DRV_OUT);
536 kfree(buffer);
537 return result;
538}
539
540static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
541{
542 int retval = 0;
543 u_char data[16];
544 unsigned int i;
545
546 mutex_lock(&ch->lock);
547 for (i = 0; i < ch->counts[type]; i++) {
548 if (0 != ch_read_element_status
549 (ch, ch->firsts[type]+i,data)) {
550 retval = -EIO;
551 break;
552 }
553 put_user(data[2], dest+i);
554 if (data[2] & CESTATUS_EXCEPT)
555 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
556 ch->firsts[type]+i,
557 (int)data[4],(int)data[5]);
558 retval = ch_read_element_status
559 (ch, ch->firsts[type]+i,data);
560 if (0 != retval)
561 break;
562 }
563 mutex_unlock(&ch->lock);
564 return retval;
565}
566
567/* ------------------------------------------------------------------------ */
568
569static void ch_destroy(struct kref *ref)
570{
571 scsi_changer *ch = container_of(ref, scsi_changer, ref);
572
573 ch->device = NULL;
574 kfree(ch->dt);
575 kfree(ch);
576}
577
578static int
579ch_release(struct inode *inode, struct file *file)
580{
581 scsi_changer *ch = file->private_data;
582
583 scsi_device_put(ch->device);
584 file->private_data = NULL;
585 kref_put(&ch->ref, ch_destroy);
586 return 0;
587}
588
589static int
590ch_open(struct inode *inode, struct file *file)
591{
592 scsi_changer *ch;
593 int minor = iminor(inode);
594
595 spin_lock(&ch_index_lock);
596 ch = idr_find(&ch_index_idr, minor);
597
598 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
599 spin_unlock(&ch_index_lock);
600 return -ENXIO;
601 }
602 spin_unlock(&ch_index_lock);
603 if (scsi_device_get(ch->device)) {
604 kref_put(&ch->ref, ch_destroy);
605 return -ENXIO;
606 }
607 /* Synchronize with ch_probe() */
608 mutex_lock(&ch->lock);
609 file->private_data = ch;
610 mutex_unlock(&ch->lock);
611 return 0;
612}
613
614static int
615ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
616{
617 if (type >= CH_TYPES || unit >= ch->counts[type])
618 return -1;
619 return 0;
620}
621
622struct changer_element_status32 {
623 int ces_type;
624 compat_uptr_t ces_data;
625};
626#define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32)
627
628static long ch_ioctl(struct file *file,
629 unsigned int cmd, unsigned long arg)
630{
631 scsi_changer *ch = file->private_data;
632 int retval;
633 void __user *argp = (void __user *)arg;
634
635 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
636 file->f_flags & O_NDELAY);
637 if (retval)
638 return retval;
639
640 switch (cmd) {
641 case CHIOGPARAMS:
642 {
643 struct changer_params params;
644
645 params.cp_curpicker = 0;
646 params.cp_npickers = ch->counts[CHET_MT];
647 params.cp_nslots = ch->counts[CHET_ST];
648 params.cp_nportals = ch->counts[CHET_IE];
649 params.cp_ndrives = ch->counts[CHET_DT];
650
651 if (copy_to_user(argp, ¶ms, sizeof(params)))
652 return -EFAULT;
653 return 0;
654 }
655 case CHIOGVPARAMS:
656 {
657 struct changer_vendor_params vparams;
658
659 memset(&vparams,0,sizeof(vparams));
660 if (ch->counts[CHET_V1]) {
661 vparams.cvp_n1 = ch->counts[CHET_V1];
662 strscpy(vparams.cvp_label1, vendor_labels[0],
663 sizeof(vparams.cvp_label1));
664 }
665 if (ch->counts[CHET_V2]) {
666 vparams.cvp_n2 = ch->counts[CHET_V2];
667 strscpy(vparams.cvp_label2, vendor_labels[1],
668 sizeof(vparams.cvp_label2));
669 }
670 if (ch->counts[CHET_V3]) {
671 vparams.cvp_n3 = ch->counts[CHET_V3];
672 strscpy(vparams.cvp_label3, vendor_labels[2],
673 sizeof(vparams.cvp_label3));
674 }
675 if (ch->counts[CHET_V4]) {
676 vparams.cvp_n4 = ch->counts[CHET_V4];
677 strscpy(vparams.cvp_label4, vendor_labels[3],
678 sizeof(vparams.cvp_label4));
679 }
680 if (copy_to_user(argp, &vparams, sizeof(vparams)))
681 return -EFAULT;
682 return 0;
683 }
684
685 case CHIOPOSITION:
686 {
687 struct changer_position pos;
688
689 if (copy_from_user(&pos, argp, sizeof (pos)))
690 return -EFAULT;
691
692 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
693 DPRINTK("CHIOPOSITION: invalid parameter\n");
694 return -EBADSLT;
695 }
696 mutex_lock(&ch->lock);
697 retval = ch_position(ch,0,
698 ch->firsts[pos.cp_type] + pos.cp_unit,
699 pos.cp_flags & CP_INVERT);
700 mutex_unlock(&ch->lock);
701 return retval;
702 }
703
704 case CHIOMOVE:
705 {
706 struct changer_move mv;
707
708 if (copy_from_user(&mv, argp, sizeof (mv)))
709 return -EFAULT;
710
711 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
712 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
713 DPRINTK("CHIOMOVE: invalid parameter\n");
714 return -EBADSLT;
715 }
716
717 mutex_lock(&ch->lock);
718 retval = ch_move(ch,0,
719 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
720 ch->firsts[mv.cm_totype] + mv.cm_tounit,
721 mv.cm_flags & CM_INVERT);
722 mutex_unlock(&ch->lock);
723 return retval;
724 }
725
726 case CHIOEXCHANGE:
727 {
728 struct changer_exchange mv;
729
730 if (copy_from_user(&mv, argp, sizeof (mv)))
731 return -EFAULT;
732
733 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
734 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
735 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
736 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
737 return -EBADSLT;
738 }
739
740 mutex_lock(&ch->lock);
741 retval = ch_exchange
742 (ch,0,
743 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
744 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
745 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
746 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
747 mutex_unlock(&ch->lock);
748 return retval;
749 }
750
751 case CHIOGSTATUS:
752 {
753 struct changer_element_status ces;
754
755 if (copy_from_user(&ces, argp, sizeof (ces)))
756 return -EFAULT;
757 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
758 return -EINVAL;
759
760 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
761 }
762#ifdef CONFIG_COMPAT
763 case CHIOGSTATUS32:
764 {
765 struct changer_element_status32 ces32;
766
767 if (copy_from_user(&ces32, argp, sizeof(ces32)))
768 return -EFAULT;
769 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
770 return -EINVAL;
771
772 return ch_gstatus(ch, ces32.ces_type,
773 compat_ptr(ces32.ces_data));
774 }
775#endif
776 case CHIOGELEM:
777 {
778 struct changer_get_element cge;
779 u_char ch_cmd[12];
780 u_char *buffer;
781 unsigned int elem;
782 int result,i;
783
784 if (copy_from_user(&cge, argp, sizeof (cge)))
785 return -EFAULT;
786
787 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
788 return -EINVAL;
789 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
790
791 buffer = kmalloc(512, GFP_KERNEL);
792 if (!buffer)
793 return -ENOMEM;
794 mutex_lock(&ch->lock);
795
796 voltag_retry:
797 memset(ch_cmd, 0, sizeof(ch_cmd));
798 ch_cmd[0] = READ_ELEMENT_STATUS;
799 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
800 (ch->voltags ? 0x10 : 0) |
801 ch_elem_to_typecode(ch,elem);
802 ch_cmd[2] = (elem >> 8) & 0xff;
803 ch_cmd[3] = elem & 0xff;
804 ch_cmd[5] = 1;
805 ch_cmd[9] = 255;
806
807 result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, REQ_OP_DRV_IN);
808 if (!result) {
809 cge.cge_status = buffer[18];
810 cge.cge_flags = 0;
811 if (buffer[18] & CESTATUS_EXCEPT) {
812 cge.cge_errno = EIO;
813 }
814 if (buffer[25] & 0x80) {
815 cge.cge_flags |= CGE_SRC;
816 if (buffer[25] & 0x40)
817 cge.cge_flags |= CGE_INVERT;
818 elem = (buffer[26]<<8) | buffer[27];
819 for (i = 0; i < 4; i++) {
820 if (elem >= ch->firsts[i] &&
821 elem < ch->firsts[i] + ch->counts[i]) {
822 cge.cge_srctype = i;
823 cge.cge_srcunit = elem-ch->firsts[i];
824 }
825 }
826 }
827 if ((buffer[22] & 0x30) == 0x30) {
828 cge.cge_flags |= CGE_IDLUN;
829 cge.cge_id = buffer[23];
830 cge.cge_lun = buffer[22] & 7;
831 }
832 if (buffer[9] & 0x80) {
833 cge.cge_flags |= CGE_PVOLTAG;
834 memcpy(cge.cge_pvoltag,buffer+28,36);
835 }
836 if (buffer[9] & 0x40) {
837 cge.cge_flags |= CGE_AVOLTAG;
838 memcpy(cge.cge_avoltag,buffer+64,36);
839 }
840 } else if (ch->voltags) {
841 ch->voltags = 0;
842 VPRINTK(KERN_INFO, "device has no volume tag support\n");
843 goto voltag_retry;
844 }
845 kfree(buffer);
846 mutex_unlock(&ch->lock);
847
848 if (copy_to_user(argp, &cge, sizeof (cge)))
849 return -EFAULT;
850 return result;
851 }
852
853 case CHIOINITELEM:
854 {
855 mutex_lock(&ch->lock);
856 retval = ch_init_elem(ch);
857 mutex_unlock(&ch->lock);
858 return retval;
859 }
860
861 case CHIOSVOLTAG:
862 {
863 struct changer_set_voltag csv;
864 int elem;
865
866 if (copy_from_user(&csv, argp, sizeof(csv)))
867 return -EFAULT;
868
869 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
870 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
871 return -EBADSLT;
872 }
873 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
874 mutex_lock(&ch->lock);
875 retval = ch_set_voltag(ch, elem,
876 csv.csv_flags & CSV_AVOLTAG,
877 csv.csv_flags & CSV_CLEARTAG,
878 csv.csv_voltag);
879 mutex_unlock(&ch->lock);
880 return retval;
881 }
882
883 default:
884 return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd,
885 argp);
886
887 }
888}
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 ret;
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 idr_preload(GFP_KERNEL);
907 spin_lock(&ch_index_lock);
908 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
909 spin_unlock(&ch_index_lock);
910 idr_preload_end();
911
912 if (ret < 0) {
913 if (ret == -ENOSPC)
914 ret = -ENODEV;
915 goto free_ch;
916 }
917
918 ch->minor = ret;
919 sprintf(ch->name,"ch%d",ch->minor);
920 ret = scsi_device_get(sd);
921 if (ret) {
922 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
923 ch->minor);
924 goto remove_idr;
925 }
926
927 mutex_init(&ch->lock);
928 kref_init(&ch->ref);
929 ch->device = sd;
930 class_dev = device_create(ch_sysfs_class, dev,
931 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
932 "s%s", ch->name);
933 if (IS_ERR(class_dev)) {
934 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
935 ch->minor);
936 ret = PTR_ERR(class_dev);
937 goto put_device;
938 }
939
940 mutex_lock(&ch->lock);
941 ret = ch_readconfig(ch);
942 if (ret) {
943 mutex_unlock(&ch->lock);
944 goto destroy_dev;
945 }
946 if (init)
947 ch_init_elem(ch);
948
949 mutex_unlock(&ch->lock);
950 dev_set_drvdata(dev, ch);
951 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
952
953 return 0;
954destroy_dev:
955 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
956put_device:
957 scsi_device_put(sd);
958remove_idr:
959 idr_remove(&ch_index_idr, ch->minor);
960free_ch:
961 kfree(ch);
962 return ret;
963}
964
965static int ch_remove(struct device *dev)
966{
967 scsi_changer *ch = dev_get_drvdata(dev);
968
969 spin_lock(&ch_index_lock);
970 idr_remove(&ch_index_idr, ch->minor);
971 dev_set_drvdata(dev, NULL);
972 spin_unlock(&ch_index_lock);
973
974 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
975 scsi_device_put(ch->device);
976 kref_put(&ch->ref, ch_destroy);
977 return 0;
978}
979
980static struct scsi_driver ch_template = {
981 .gendrv = {
982 .name = "ch",
983 .owner = THIS_MODULE,
984 .probe = ch_probe,
985 .remove = ch_remove,
986 },
987};
988
989static const struct file_operations changer_fops = {
990 .owner = THIS_MODULE,
991 .open = ch_open,
992 .release = ch_release,
993 .unlocked_ioctl = ch_ioctl,
994 .compat_ioctl = compat_ptr_ioctl,
995 .llseek = noop_llseek,
996};
997
998static int __init init_ch_module(void)
999{
1000 int rc;
1001
1002 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1003 ch_sysfs_class = class_create("scsi_changer");
1004 if (IS_ERR(ch_sysfs_class)) {
1005 rc = PTR_ERR(ch_sysfs_class);
1006 return rc;
1007 }
1008 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1009 if (rc < 0) {
1010 printk("Unable to get major %d for SCSI-Changer\n",
1011 SCSI_CHANGER_MAJOR);
1012 goto fail1;
1013 }
1014 rc = scsi_register_driver(&ch_template.gendrv);
1015 if (rc < 0)
1016 goto fail2;
1017 return 0;
1018
1019 fail2:
1020 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1021 fail1:
1022 class_destroy(ch_sysfs_class);
1023 return rc;
1024}
1025
1026static void __exit exit_ch_module(void)
1027{
1028 scsi_unregister_driver(&ch_template.gendrv);
1029 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1030 class_destroy(ch_sysfs_class);
1031 idr_destroy(&ch_index_idr);
1032}
1033
1034module_init(init_ch_module);
1035module_exit(exit_ch_module);
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 */