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(sdev: ch->device, cmd, opf: op, buffer, bufflen: buflength,
201 timeout: timeout * HZ, MAX_RETRIES, args: &exec_args);
202 if (result < 0)
203 return result;
204 if (scsi_sense_valid(sshdr: &sshdr)) {
205 if (debug)
206 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
207 errno = ch_find_errno(sshdr: &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(size: 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, cmd_len: 12,
258 buffer, buflength: 256, op: 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(objp: 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(objp: 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, cmd_len: 6, NULL, buflength: 0, op: 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(size: 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, cmd_len: 10, buffer, buflength: 255, op: REQ_OP_DRV_IN);
311 if (0 != result) {
312 cmd[1] |= (1<<3);
313 result = ch_do_scsi(ch, cmd, cmd_len: 10, buffer, buflength: 255, op: 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(n: ch->counts[CHET_DT], size: sizeof(*ch->dt),
363 GFP_KERNEL);
364
365 if (!ch->dt) {
366 kfree(objp: 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: 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(objp: 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, cmd_len: 10, NULL, buflength: 0, op: 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, cmd_len: 12, NULL, buflength: 0, op: 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, cmd_len: 12, NULL, buflength: 0, op: 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(size: 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(tag: buffer);
534
535 result = ch_do_scsi(ch, cmd, cmd_len: 12, buffer, buflength: 256, op: REQ_OP_DRV_OUT);
536 kfree(objp: 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, elem: 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, elem: ch->firsts[type]+i,data);
560 if (0 != retval)
561 break;
562 }
563 mutex_unlock(lock: &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(objp: ch->dt);
575 kfree(objp: 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(kref: &ch->ref, release: 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(lock: &ch_index_lock);
596 ch = idr_find(&ch_index_idr, id: minor);
597
598 if (ch == NULL || !kref_get_unless_zero(kref: &ch->ref)) {
599 spin_unlock(lock: &ch_index_lock);
600 return -ENXIO;
601 }
602 spin_unlock(lock: &ch_index_lock);
603 if (scsi_device_get(ch->device)) {
604 kref_put(kref: &ch->ref, release: ch_destroy);
605 return -ENXIO;
606 }
607 /* Synchronize with ch_probe() */
608 mutex_lock(&ch->lock);
609 file->private_data = ch;
610 mutex_unlock(lock: &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(sdev: ch->device, cmd,
636 ndelay: 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(to: argp, from: &params, n: 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 strncpy(p: vparams.cvp_label1,q: vendor_labels[0],size: 16);
663 }
664 if (ch->counts[CHET_V2]) {
665 vparams.cvp_n2 = ch->counts[CHET_V2];
666 strncpy(p: vparams.cvp_label2,q: vendor_labels[1],size: 16);
667 }
668 if (ch->counts[CHET_V3]) {
669 vparams.cvp_n3 = ch->counts[CHET_V3];
670 strncpy(p: vparams.cvp_label3,q: vendor_labels[2],size: 16);
671 }
672 if (ch->counts[CHET_V4]) {
673 vparams.cvp_n4 = ch->counts[CHET_V4];
674 strncpy(p: vparams.cvp_label4,q: vendor_labels[3],size: 16);
675 }
676 if (copy_to_user(to: argp, from: &vparams, n: sizeof(vparams)))
677 return -EFAULT;
678 return 0;
679 }
680
681 case CHIOPOSITION:
682 {
683 struct changer_position pos;
684
685 if (copy_from_user(to: &pos, from: argp, n: sizeof (pos)))
686 return -EFAULT;
687
688 if (0 != ch_checkrange(ch, type: pos.cp_type, unit: pos.cp_unit)) {
689 DPRINTK("CHIOPOSITION: invalid parameter\n");
690 return -EBADSLT;
691 }
692 mutex_lock(&ch->lock);
693 retval = ch_position(ch,trans: 0,
694 elem: ch->firsts[pos.cp_type] + pos.cp_unit,
695 rotate: pos.cp_flags & CP_INVERT);
696 mutex_unlock(lock: &ch->lock);
697 return retval;
698 }
699
700 case CHIOMOVE:
701 {
702 struct changer_move mv;
703
704 if (copy_from_user(to: &mv, from: argp, n: sizeof (mv)))
705 return -EFAULT;
706
707 if (0 != ch_checkrange(ch, type: mv.cm_fromtype, unit: mv.cm_fromunit) ||
708 0 != ch_checkrange(ch, type: mv.cm_totype, unit: mv.cm_tounit )) {
709 DPRINTK("CHIOMOVE: invalid parameter\n");
710 return -EBADSLT;
711 }
712
713 mutex_lock(&ch->lock);
714 retval = ch_move(ch,trans: 0,
715 src: ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
716 dest: ch->firsts[mv.cm_totype] + mv.cm_tounit,
717 rotate: mv.cm_flags & CM_INVERT);
718 mutex_unlock(lock: &ch->lock);
719 return retval;
720 }
721
722 case CHIOEXCHANGE:
723 {
724 struct changer_exchange mv;
725
726 if (copy_from_user(to: &mv, from: argp, n: sizeof (mv)))
727 return -EFAULT;
728
729 if (0 != ch_checkrange(ch, type: mv.ce_srctype, unit: mv.ce_srcunit ) ||
730 0 != ch_checkrange(ch, type: mv.ce_fdsttype, unit: mv.ce_fdstunit) ||
731 0 != ch_checkrange(ch, type: mv.ce_sdsttype, unit: mv.ce_sdstunit)) {
732 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
733 return -EBADSLT;
734 }
735
736 mutex_lock(&ch->lock);
737 retval = ch_exchange
738 (ch,trans: 0,
739 src: ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
740 dest1: ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
741 dest2: ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
742 rotate1: mv.ce_flags & CE_INVERT1, rotate2: mv.ce_flags & CE_INVERT2);
743 mutex_unlock(lock: &ch->lock);
744 return retval;
745 }
746
747 case CHIOGSTATUS:
748 {
749 struct changer_element_status ces;
750
751 if (copy_from_user(to: &ces, from: argp, n: sizeof (ces)))
752 return -EFAULT;
753 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
754 return -EINVAL;
755
756 return ch_gstatus(ch, type: ces.ces_type, dest: ces.ces_data);
757 }
758#ifdef CONFIG_COMPAT
759 case CHIOGSTATUS32:
760 {
761 struct changer_element_status32 ces32;
762
763 if (copy_from_user(to: &ces32, from: argp, n: sizeof(ces32)))
764 return -EFAULT;
765 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
766 return -EINVAL;
767
768 return ch_gstatus(ch, type: ces32.ces_type,
769 dest: compat_ptr(uptr: ces32.ces_data));
770 }
771#endif
772 case CHIOGELEM:
773 {
774 struct changer_get_element cge;
775 u_char ch_cmd[12];
776 u_char *buffer;
777 unsigned int elem;
778 int result,i;
779
780 if (copy_from_user(to: &cge, from: argp, n: sizeof (cge)))
781 return -EFAULT;
782
783 if (0 != ch_checkrange(ch, type: cge.cge_type, unit: cge.cge_unit))
784 return -EINVAL;
785 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
786
787 buffer = kmalloc(size: 512, GFP_KERNEL);
788 if (!buffer)
789 return -ENOMEM;
790 mutex_lock(&ch->lock);
791
792 voltag_retry:
793 memset(ch_cmd, 0, sizeof(ch_cmd));
794 ch_cmd[0] = READ_ELEMENT_STATUS;
795 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
796 (ch->voltags ? 0x10 : 0) |
797 ch_elem_to_typecode(ch,elem);
798 ch_cmd[2] = (elem >> 8) & 0xff;
799 ch_cmd[3] = elem & 0xff;
800 ch_cmd[5] = 1;
801 ch_cmd[9] = 255;
802
803 result = ch_do_scsi(ch, cmd: ch_cmd, cmd_len: 12, buffer, buflength: 256, op: REQ_OP_DRV_IN);
804 if (!result) {
805 cge.cge_status = buffer[18];
806 cge.cge_flags = 0;
807 if (buffer[18] & CESTATUS_EXCEPT) {
808 cge.cge_errno = EIO;
809 }
810 if (buffer[25] & 0x80) {
811 cge.cge_flags |= CGE_SRC;
812 if (buffer[25] & 0x40)
813 cge.cge_flags |= CGE_INVERT;
814 elem = (buffer[26]<<8) | buffer[27];
815 for (i = 0; i < 4; i++) {
816 if (elem >= ch->firsts[i] &&
817 elem < ch->firsts[i] + ch->counts[i]) {
818 cge.cge_srctype = i;
819 cge.cge_srcunit = elem-ch->firsts[i];
820 }
821 }
822 }
823 if ((buffer[22] & 0x30) == 0x30) {
824 cge.cge_flags |= CGE_IDLUN;
825 cge.cge_id = buffer[23];
826 cge.cge_lun = buffer[22] & 7;
827 }
828 if (buffer[9] & 0x80) {
829 cge.cge_flags |= CGE_PVOLTAG;
830 memcpy(cge.cge_pvoltag,buffer+28,36);
831 }
832 if (buffer[9] & 0x40) {
833 cge.cge_flags |= CGE_AVOLTAG;
834 memcpy(cge.cge_avoltag,buffer+64,36);
835 }
836 } else if (ch->voltags) {
837 ch->voltags = 0;
838 VPRINTK(KERN_INFO, "device has no volume tag support\n");
839 goto voltag_retry;
840 }
841 kfree(objp: buffer);
842 mutex_unlock(lock: &ch->lock);
843
844 if (copy_to_user(to: argp, from: &cge, n: sizeof (cge)))
845 return -EFAULT;
846 return result;
847 }
848
849 case CHIOINITELEM:
850 {
851 mutex_lock(&ch->lock);
852 retval = ch_init_elem(ch);
853 mutex_unlock(lock: &ch->lock);
854 return retval;
855 }
856
857 case CHIOSVOLTAG:
858 {
859 struct changer_set_voltag csv;
860 int elem;
861
862 if (copy_from_user(to: &csv, from: argp, n: sizeof(csv)))
863 return -EFAULT;
864
865 if (0 != ch_checkrange(ch, type: csv.csv_type, unit: csv.csv_unit)) {
866 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
867 return -EBADSLT;
868 }
869 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
870 mutex_lock(&ch->lock);
871 retval = ch_set_voltag(ch, elem,
872 alternate: csv.csv_flags & CSV_AVOLTAG,
873 clear: csv.csv_flags & CSV_CLEARTAG,
874 tag: csv.csv_voltag);
875 mutex_unlock(lock: &ch->lock);
876 return retval;
877 }
878
879 default:
880 return scsi_ioctl(sdev: ch->device, open_for_write: file->f_mode & FMODE_WRITE, cmd,
881 arg: argp);
882
883 }
884}
885
886/* ------------------------------------------------------------------------ */
887
888static int ch_probe(struct device *dev)
889{
890 struct scsi_device *sd = to_scsi_device(dev);
891 struct device *class_dev;
892 int ret;
893 scsi_changer *ch;
894
895 if (sd->type != TYPE_MEDIUM_CHANGER)
896 return -ENODEV;
897
898 ch = kzalloc(size: sizeof(*ch), GFP_KERNEL);
899 if (NULL == ch)
900 return -ENOMEM;
901
902 idr_preload(GFP_KERNEL);
903 spin_lock(lock: &ch_index_lock);
904 ret = idr_alloc(&ch_index_idr, ptr: ch, start: 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
905 spin_unlock(lock: &ch_index_lock);
906 idr_preload_end();
907
908 if (ret < 0) {
909 if (ret == -ENOSPC)
910 ret = -ENODEV;
911 goto free_ch;
912 }
913
914 ch->minor = ret;
915 sprintf(buf: ch->name,fmt: "ch%d",ch->minor);
916 ret = scsi_device_get(sd);
917 if (ret) {
918 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
919 ch->minor);
920 goto remove_idr;
921 }
922
923 mutex_init(&ch->lock);
924 kref_init(kref: &ch->ref);
925 ch->device = sd;
926 class_dev = device_create(cls: ch_sysfs_class, parent: dev,
927 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), drvdata: ch,
928 fmt: "s%s", ch->name);
929 if (IS_ERR(ptr: class_dev)) {
930 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
931 ch->minor);
932 ret = PTR_ERR(ptr: class_dev);
933 goto put_device;
934 }
935
936 mutex_lock(&ch->lock);
937 ret = ch_readconfig(ch);
938 if (ret) {
939 mutex_unlock(lock: &ch->lock);
940 goto destroy_dev;
941 }
942 if (init)
943 ch_init_elem(ch);
944
945 mutex_unlock(lock: &ch->lock);
946 dev_set_drvdata(dev, data: ch);
947 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
948
949 return 0;
950destroy_dev:
951 device_destroy(cls: ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
952put_device:
953 scsi_device_put(sd);
954remove_idr:
955 idr_remove(&ch_index_idr, id: ch->minor);
956free_ch:
957 kfree(objp: ch);
958 return ret;
959}
960
961static int ch_remove(struct device *dev)
962{
963 scsi_changer *ch = dev_get_drvdata(dev);
964
965 spin_lock(lock: &ch_index_lock);
966 idr_remove(&ch_index_idr, id: ch->minor);
967 dev_set_drvdata(dev, NULL);
968 spin_unlock(lock: &ch_index_lock);
969
970 device_destroy(cls: ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
971 scsi_device_put(ch->device);
972 kref_put(kref: &ch->ref, release: ch_destroy);
973 return 0;
974}
975
976static struct scsi_driver ch_template = {
977 .gendrv = {
978 .name = "ch",
979 .owner = THIS_MODULE,
980 .probe = ch_probe,
981 .remove = ch_remove,
982 },
983};
984
985static const struct file_operations changer_fops = {
986 .owner = THIS_MODULE,
987 .open = ch_open,
988 .release = ch_release,
989 .unlocked_ioctl = ch_ioctl,
990 .compat_ioctl = compat_ptr_ioctl,
991 .llseek = noop_llseek,
992};
993
994static int __init init_ch_module(void)
995{
996 int rc;
997
998 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
999 ch_sysfs_class = class_create(name: "scsi_changer");
1000 if (IS_ERR(ptr: ch_sysfs_class)) {
1001 rc = PTR_ERR(ptr: ch_sysfs_class);
1002 return rc;
1003 }
1004 rc = register_chrdev(SCSI_CHANGER_MAJOR,name: "ch",fops: &changer_fops);
1005 if (rc < 0) {
1006 printk("Unable to get major %d for SCSI-Changer\n",
1007 SCSI_CHANGER_MAJOR);
1008 goto fail1;
1009 }
1010 rc = scsi_register_driver(&ch_template.gendrv);
1011 if (rc < 0)
1012 goto fail2;
1013 return 0;
1014
1015 fail2:
1016 unregister_chrdev(SCSI_CHANGER_MAJOR, name: "ch");
1017 fail1:
1018 class_destroy(cls: ch_sysfs_class);
1019 return rc;
1020}
1021
1022static void __exit exit_ch_module(void)
1023{
1024 scsi_unregister_driver(&ch_template.gendrv);
1025 unregister_chrdev(SCSI_CHANGER_MAJOR, name: "ch");
1026 class_destroy(cls: ch_sysfs_class);
1027 idr_destroy(&ch_index_idr);
1028}
1029
1030module_init(init_ch_module);
1031module_exit(exit_ch_module);
1032

source code of linux/drivers/scsi/ch.c