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
41 MODULE_DESCRIPTION("device driver for scsi media changer devices");
42 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
43 MODULE_LICENSE("GPL");
44 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
45 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
46
47 static int init = 1;
48 module_param(init, int, 0444);
49 MODULE_PARM_DESC(init, \
50 "initialize element status on driver load (default: on)");
51
52 static int timeout_move = 300;
53 module_param(timeout_move, int, 0644);
54 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55 "(default: 300 seconds)");
56
57 static int timeout_init = 3600;
58 module_param(timeout_init, int, 0644);
59 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60 "(default: 3600 seconds)");
61
62 static int verbose = 1;
63 module_param(verbose, int, 0644);
64 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66 static int debug;
67 module_param(debug, int, 0644);
68 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69 "detailed sense codes on scsi errors (default: off)");
70
71 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72 static int dt_lun[CH_DT_MAX];
73 module_param_array(dt_id, int, NULL, 0444);
74 module_param_array(dt_lun, int, NULL, 0444);
75
76 /* tell the driver about vendor-specific slots */
77 static int vendor_firsts[CH_TYPES-4];
78 static int vendor_counts[CH_TYPES-4];
79 module_param_array(vendor_firsts, int, NULL, 0444);
80 module_param_array(vendor_counts, int, NULL, 0444);
81
82 static 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...) \
91 do { \
92 if (debug) \
93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
94 } while (0)
95 #define VPRINTK(level, fmt, arg...) \
96 do { \
97 if (verbose) \
98 ch_printk(level, ch, fmt, ##arg); \
99 } while (0)
100
101 /* ------------------------------------------------------------------- */
102
103 #define MAX_RETRIES 1
104
105 static const struct class ch_sysfs_class = {
106 .name = "scsi_changer",
107 };
108
109 typedef struct {
110 struct kref ref;
111 struct list_head list;
112 int minor;
113 char name[8];
114 struct scsi_device *device;
115 struct scsi_device **dt; /* ptrs to data transfer elements */
116 u_int firsts[CH_TYPES];
117 u_int counts[CH_TYPES];
118 u_int voltags;
119 struct mutex lock;
120 } scsi_changer;
121
122 static DEFINE_IDR(ch_index_idr);
123 static DEFINE_SPINLOCK(ch_index_lock);
124
125 static const struct {
126 unsigned char sense;
127 unsigned char asc;
128 unsigned char ascq;
129 int errno;
130 } ch_err[] = {
131 /* Just filled in what looks right. Hav'nt checked any standard paper for
132 these errno assignments, so they may be wrong... */
133 {
134 .sense = ILLEGAL_REQUEST,
135 .asc = 0x21,
136 .ascq = 0x01,
137 .errno = EBADSLT, /* Invalid element address */
138 },{
139 .sense = ILLEGAL_REQUEST,
140 .asc = 0x28,
141 .ascq = 0x01,
142 .errno = EBADE, /* Import or export element accessed */
143 },{
144 .sense = ILLEGAL_REQUEST,
145 .asc = 0x3B,
146 .ascq = 0x0D,
147 .errno = EXFULL, /* Medium destination element full */
148 },{
149 .sense = ILLEGAL_REQUEST,
150 .asc = 0x3B,
151 .ascq = 0x0E,
152 .errno = EBADE, /* Medium source element empty */
153 },{
154 .sense = ILLEGAL_REQUEST,
155 .asc = 0x20,
156 .ascq = 0x00,
157 .errno = EBADRQC, /* Invalid command operation code */
158 },{
159 /* end of list */
160 }
161 };
162
163 /* ------------------------------------------------------------------- */
164
ch_find_errno(struct scsi_sense_hdr * sshdr)165 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
166 {
167 int i,errno = 0;
168
169 /* Check to see if additional sense information is available */
170 if (scsi_sense_valid(sshdr) &&
171 sshdr->asc != 0) {
172 for (i = 0; ch_err[i].errno != 0; i++) {
173 if (ch_err[i].sense == sshdr->sense_key &&
174 ch_err[i].asc == sshdr->asc &&
175 ch_err[i].ascq == sshdr->ascq) {
176 errno = -ch_err[i].errno;
177 break;
178 }
179 }
180 }
181 if (errno == 0)
182 errno = -EIO;
183 return errno;
184 }
185
186 static int
ch_do_scsi(scsi_changer * ch,unsigned char * cmd,int cmd_len,void * buffer,unsigned int buflength,enum req_op op)187 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
188 void *buffer, unsigned int buflength, enum req_op op)
189 {
190 int errno = 0, timeout, result;
191 struct scsi_sense_hdr sshdr;
192 struct scsi_failure failure_defs[] = {
193 {
194 .sense = UNIT_ATTENTION,
195 .asc = SCMD_FAILURE_ASC_ANY,
196 .ascq = SCMD_FAILURE_ASCQ_ANY,
197 .allowed = 3,
198 .result = SAM_STAT_CHECK_CONDITION,
199 },
200 {}
201 };
202 struct scsi_failures failures = {
203 .failure_definitions = failure_defs,
204 };
205 const struct scsi_exec_args exec_args = {
206 .sshdr = &sshdr,
207 .failures = &failures,
208 };
209
210 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
211 ? timeout_init : timeout_move;
212
213 result = scsi_execute_cmd(ch->device, cmd, op, buffer, buflength,
214 timeout * HZ, MAX_RETRIES, &exec_args);
215 if (result < 0)
216 return result;
217 if (scsi_sense_valid(&sshdr)) {
218 if (debug)
219 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
220 errno = ch_find_errno(&sshdr);
221 }
222 return errno;
223 }
224
225 /* ------------------------------------------------------------------------ */
226
227 static int
ch_elem_to_typecode(scsi_changer * ch,u_int elem)228 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
229 {
230 int i;
231
232 for (i = 0; i < CH_TYPES; i++) {
233 if (elem >= ch->firsts[i] &&
234 elem < ch->firsts[i] +
235 ch->counts[i])
236 return i+1;
237 }
238 return 0;
239 }
240
241 static int
ch_read_element_status(scsi_changer * ch,u_int elem,char * data)242 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
243 {
244 u_char cmd[12];
245 u_char *buffer;
246 int result;
247
248 buffer = kmalloc(512, GFP_KERNEL);
249 if(!buffer)
250 return -ENOMEM;
251
252 retry:
253 memset(cmd,0,sizeof(cmd));
254 cmd[0] = READ_ELEMENT_STATUS;
255 cmd[1] = ((ch->device->lun & 0x7) << 5) |
256 (ch->voltags ? 0x10 : 0) |
257 ch_elem_to_typecode(ch,elem);
258 cmd[2] = (elem >> 8) & 0xff;
259 cmd[3] = elem & 0xff;
260 cmd[5] = 1;
261 cmd[9] = 255;
262 if (0 == (result = ch_do_scsi(ch, cmd, 12,
263 buffer, 256, REQ_OP_DRV_IN))) {
264 if (((buffer[16] << 8) | buffer[17]) != elem) {
265 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
266 elem,(buffer[16] << 8) | buffer[17]);
267 kfree(buffer);
268 return -EIO;
269 }
270 memcpy(data,buffer+16,16);
271 } else {
272 if (ch->voltags) {
273 ch->voltags = 0;
274 VPRINTK(KERN_INFO, "device has no volume tag support\n");
275 goto retry;
276 }
277 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
278 }
279 kfree(buffer);
280 return result;
281 }
282
283 static int
ch_init_elem(scsi_changer * ch)284 ch_init_elem(scsi_changer *ch)
285 {
286 int err;
287 u_char cmd[6];
288
289 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
290 memset(cmd,0,sizeof(cmd));
291 cmd[0] = INITIALIZE_ELEMENT_STATUS;
292 cmd[1] = (ch->device->lun & 0x7) << 5;
293 err = ch_do_scsi(ch, cmd, 6, NULL, 0, REQ_OP_DRV_IN);
294 VPRINTK(KERN_INFO, "... finished\n");
295 return err;
296 }
297
298 static int
ch_readconfig(scsi_changer * ch)299 ch_readconfig(scsi_changer *ch)
300 {
301 u_char cmd[10], data[16];
302 u_char *buffer;
303 int result,id,lun,i;
304 u_int elem;
305
306 buffer = kzalloc(512, GFP_KERNEL);
307 if (!buffer)
308 return -ENOMEM;
309
310 memset(cmd,0,sizeof(cmd));
311 cmd[0] = MODE_SENSE;
312 cmd[1] = (ch->device->lun & 0x7) << 5;
313 cmd[2] = 0x1d;
314 cmd[4] = 255;
315 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);
316 if (0 != result) {
317 cmd[1] |= (1<<3);
318 result = ch_do_scsi(ch, cmd, 10, buffer, 255, REQ_OP_DRV_IN);
319 }
320 if (0 == result) {
321 ch->firsts[CHET_MT] =
322 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
323 ch->counts[CHET_MT] =
324 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
325 ch->firsts[CHET_ST] =
326 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
327 ch->counts[CHET_ST] =
328 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
329 ch->firsts[CHET_IE] =
330 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
331 ch->counts[CHET_IE] =
332 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
333 ch->firsts[CHET_DT] =
334 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
335 ch->counts[CHET_DT] =
336 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
337 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
338 ch->firsts[CHET_MT],
339 ch->counts[CHET_MT]);
340 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
341 ch->firsts[CHET_ST],
342 ch->counts[CHET_ST]);
343 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
344 ch->firsts[CHET_IE],
345 ch->counts[CHET_IE]);
346 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
347 ch->firsts[CHET_DT],
348 ch->counts[CHET_DT]);
349 } else {
350 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
351 }
352
353 /* vendor specific element types */
354 for (i = 0; i < 4; i++) {
355 if (0 == vendor_counts[i])
356 continue;
357 if (NULL == vendor_labels[i])
358 continue;
359 ch->firsts[CHET_V1+i] = vendor_firsts[i];
360 ch->counts[CHET_V1+i] = vendor_counts[i];
361 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
362 i+5,i+1,vendor_firsts[i],vendor_counts[i],
363 vendor_labels[i]);
364 }
365
366 /* look up the devices of the data transfer elements */
367 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
368 GFP_KERNEL);
369
370 if (!ch->dt) {
371 kfree(buffer);
372 return -ENOMEM;
373 }
374
375 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
376 id = -1;
377 lun = 0;
378 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
379 id = dt_id[elem];
380 lun = dt_lun[elem];
381 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
382 elem+ch->firsts[CHET_DT]);
383 } else if (0 != ch_read_element_status
384 (ch,elem+ch->firsts[CHET_DT],data)) {
385 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
386 elem+ch->firsts[CHET_DT]);
387 } else {
388 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
389 if (data[6] & 0x80) {
390 VPRINTK(KERN_CONT, "not this SCSI bus\n");
391 ch->dt[elem] = NULL;
392 } else if (0 == (data[6] & 0x30)) {
393 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
394 ch->dt[elem] = NULL;
395 } else {
396 id = ch->device->id;
397 lun = 0;
398 if (data[6] & 0x20) id = data[7];
399 if (data[6] & 0x10) lun = data[6] & 7;
400 }
401 }
402 if (-1 != id) {
403 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
404 ch->dt[elem] =
405 scsi_device_lookup(ch->device->host,
406 ch->device->channel,
407 id,lun);
408 if (!ch->dt[elem]) {
409 /* should not happen */
410 VPRINTK(KERN_CONT, "Huh? device not found!\n");
411 } else {
412 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
413 ch->dt[elem]->vendor,
414 ch->dt[elem]->model,
415 ch->dt[elem]->rev);
416 }
417 }
418 }
419 ch->voltags = 1;
420 kfree(buffer);
421
422 return 0;
423 }
424
425 /* ------------------------------------------------------------------------ */
426
427 static int
ch_position(scsi_changer * ch,u_int trans,u_int elem,int rotate)428 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
429 {
430 u_char cmd[10];
431
432 DPRINTK("position: 0x%x\n",elem);
433 if (0 == trans)
434 trans = ch->firsts[CHET_MT];
435 memset(cmd,0,sizeof(cmd));
436 cmd[0] = POSITION_TO_ELEMENT;
437 cmd[1] = (ch->device->lun & 0x7) << 5;
438 cmd[2] = (trans >> 8) & 0xff;
439 cmd[3] = trans & 0xff;
440 cmd[4] = (elem >> 8) & 0xff;
441 cmd[5] = elem & 0xff;
442 cmd[8] = rotate ? 1 : 0;
443 return ch_do_scsi(ch, cmd, 10, NULL, 0, REQ_OP_DRV_IN);
444 }
445
446 static int
ch_move(scsi_changer * ch,u_int trans,u_int src,u_int dest,int rotate)447 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
448 {
449 u_char cmd[12];
450
451 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
452 if (0 == trans)
453 trans = ch->firsts[CHET_MT];
454 memset(cmd,0,sizeof(cmd));
455 cmd[0] = MOVE_MEDIUM;
456 cmd[1] = (ch->device->lun & 0x7) << 5;
457 cmd[2] = (trans >> 8) & 0xff;
458 cmd[3] = trans & 0xff;
459 cmd[4] = (src >> 8) & 0xff;
460 cmd[5] = src & 0xff;
461 cmd[6] = (dest >> 8) & 0xff;
462 cmd[7] = dest & 0xff;
463 cmd[10] = rotate ? 1 : 0;
464 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN);
465 }
466
467 static int
ch_exchange(scsi_changer * ch,u_int trans,u_int src,u_int dest1,u_int dest2,int rotate1,int rotate2)468 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
469 u_int dest1, u_int dest2, int rotate1, int rotate2)
470 {
471 u_char cmd[12];
472
473 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
474 src,dest1,dest2);
475 if (0 == trans)
476 trans = ch->firsts[CHET_MT];
477 memset(cmd,0,sizeof(cmd));
478 cmd[0] = EXCHANGE_MEDIUM;
479 cmd[1] = (ch->device->lun & 0x7) << 5;
480 cmd[2] = (trans >> 8) & 0xff;
481 cmd[3] = trans & 0xff;
482 cmd[4] = (src >> 8) & 0xff;
483 cmd[5] = src & 0xff;
484 cmd[6] = (dest1 >> 8) & 0xff;
485 cmd[7] = dest1 & 0xff;
486 cmd[8] = (dest2 >> 8) & 0xff;
487 cmd[9] = dest2 & 0xff;
488 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
489
490 return ch_do_scsi(ch, cmd, 12, NULL, 0, REQ_OP_DRV_IN);
491 }
492
493 static void
ch_check_voltag(char * tag)494 ch_check_voltag(char *tag)
495 {
496 int i;
497
498 for (i = 0; i < 32; i++) {
499 /* restrict to ascii */
500 if (tag[i] >= 0x7f || tag[i] < 0x20)
501 tag[i] = ' ';
502 /* don't allow search wildcards */
503 if (tag[i] == '?' ||
504 tag[i] == '*')
505 tag[i] = ' ';
506 }
507 }
508
509 static int
ch_set_voltag(scsi_changer * ch,u_int elem,int alternate,int clear,u_char * tag)510 ch_set_voltag(scsi_changer *ch, u_int elem,
511 int alternate, int clear, u_char *tag)
512 {
513 u_char cmd[12];
514 u_char *buffer;
515 int result;
516
517 buffer = kzalloc(512, GFP_KERNEL);
518 if (!buffer)
519 return -ENOMEM;
520
521 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
522 clear ? "clear" : "set",
523 alternate ? "alternate" : "primary",
524 elem, tag);
525 memset(cmd,0,sizeof(cmd));
526 cmd[0] = SEND_VOLUME_TAG;
527 cmd[1] = ((ch->device->lun & 0x7) << 5) |
528 ch_elem_to_typecode(ch,elem);
529 cmd[2] = (elem >> 8) & 0xff;
530 cmd[3] = elem & 0xff;
531 cmd[5] = clear
532 ? (alternate ? 0x0d : 0x0c)
533 : (alternate ? 0x0b : 0x0a);
534
535 cmd[9] = 255;
536
537 memcpy(buffer,tag,32);
538 ch_check_voltag(buffer);
539
540 result = ch_do_scsi(ch, cmd, 12, buffer, 256, REQ_OP_DRV_OUT);
541 kfree(buffer);
542 return result;
543 }
544
ch_gstatus(scsi_changer * ch,int type,unsigned char __user * dest)545 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
546 {
547 int retval = 0;
548 u_char data[16];
549 unsigned int i;
550
551 mutex_lock(&ch->lock);
552 for (i = 0; i < ch->counts[type]; i++) {
553 if (0 != ch_read_element_status
554 (ch, ch->firsts[type]+i,data)) {
555 retval = -EIO;
556 break;
557 }
558 put_user(data[2], dest+i);
559 if (data[2] & CESTATUS_EXCEPT)
560 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
561 ch->firsts[type]+i,
562 (int)data[4],(int)data[5]);
563 retval = ch_read_element_status
564 (ch, ch->firsts[type]+i,data);
565 if (0 != retval)
566 break;
567 }
568 mutex_unlock(&ch->lock);
569 return retval;
570 }
571
572 /* ------------------------------------------------------------------------ */
573
ch_destroy(struct kref * ref)574 static void ch_destroy(struct kref *ref)
575 {
576 scsi_changer *ch = container_of(ref, scsi_changer, ref);
577
578 ch->device = NULL;
579 kfree(ch->dt);
580 kfree(ch);
581 }
582
583 static int
ch_release(struct inode * inode,struct file * file)584 ch_release(struct inode *inode, struct file *file)
585 {
586 scsi_changer *ch = file->private_data;
587
588 scsi_device_put(ch->device);
589 file->private_data = NULL;
590 kref_put(&ch->ref, ch_destroy);
591 return 0;
592 }
593
594 static int
ch_open(struct inode * inode,struct file * file)595 ch_open(struct inode *inode, struct file *file)
596 {
597 scsi_changer *ch;
598 int minor = iminor(inode);
599
600 spin_lock(&ch_index_lock);
601 ch = idr_find(&ch_index_idr, minor);
602
603 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
604 spin_unlock(&ch_index_lock);
605 return -ENXIO;
606 }
607 spin_unlock(&ch_index_lock);
608 if (scsi_device_get(ch->device)) {
609 kref_put(&ch->ref, ch_destroy);
610 return -ENXIO;
611 }
612 /* Synchronize with ch_probe() */
613 mutex_lock(&ch->lock);
614 file->private_data = ch;
615 mutex_unlock(&ch->lock);
616 return 0;
617 }
618
619 static int
ch_checkrange(scsi_changer * ch,unsigned int type,unsigned int unit)620 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
621 {
622 if (type >= CH_TYPES || unit >= ch->counts[type])
623 return -1;
624 return 0;
625 }
626
627 struct changer_element_status32 {
628 int ces_type;
629 compat_uptr_t ces_data;
630 };
631 #define CHIOGSTATUS32 _IOW('c', 8, struct changer_element_status32)
632
ch_ioctl(struct file * file,unsigned int cmd,unsigned long arg)633 static long ch_ioctl(struct file *file,
634 unsigned int cmd, unsigned long arg)
635 {
636 scsi_changer *ch = file->private_data;
637 int retval;
638 void __user *argp = (void __user *)arg;
639
640 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
641 file->f_flags & O_NDELAY);
642 if (retval)
643 return retval;
644
645 switch (cmd) {
646 case CHIOGPARAMS:
647 {
648 struct changer_params params;
649
650 params.cp_curpicker = 0;
651 params.cp_npickers = ch->counts[CHET_MT];
652 params.cp_nslots = ch->counts[CHET_ST];
653 params.cp_nportals = ch->counts[CHET_IE];
654 params.cp_ndrives = ch->counts[CHET_DT];
655
656 if (copy_to_user(argp, ¶ms, sizeof(params)))
657 return -EFAULT;
658 return 0;
659 }
660 case CHIOGVPARAMS:
661 {
662 struct changer_vendor_params vparams;
663
664 memset(&vparams,0,sizeof(vparams));
665 if (ch->counts[CHET_V1]) {
666 vparams.cvp_n1 = ch->counts[CHET_V1];
667 strscpy(vparams.cvp_label1, vendor_labels[0],
668 sizeof(vparams.cvp_label1));
669 }
670 if (ch->counts[CHET_V2]) {
671 vparams.cvp_n2 = ch->counts[CHET_V2];
672 strscpy(vparams.cvp_label2, vendor_labels[1],
673 sizeof(vparams.cvp_label2));
674 }
675 if (ch->counts[CHET_V3]) {
676 vparams.cvp_n3 = ch->counts[CHET_V3];
677 strscpy(vparams.cvp_label3, vendor_labels[2],
678 sizeof(vparams.cvp_label3));
679 }
680 if (ch->counts[CHET_V4]) {
681 vparams.cvp_n4 = ch->counts[CHET_V4];
682 strscpy(vparams.cvp_label4, vendor_labels[3],
683 sizeof(vparams.cvp_label4));
684 }
685 if (copy_to_user(argp, &vparams, sizeof(vparams)))
686 return -EFAULT;
687 return 0;
688 }
689
690 case CHIOPOSITION:
691 {
692 struct changer_position pos;
693
694 if (copy_from_user(&pos, argp, sizeof (pos)))
695 return -EFAULT;
696
697 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
698 DPRINTK("CHIOPOSITION: invalid parameter\n");
699 return -EBADSLT;
700 }
701 mutex_lock(&ch->lock);
702 retval = ch_position(ch,0,
703 ch->firsts[pos.cp_type] + pos.cp_unit,
704 pos.cp_flags & CP_INVERT);
705 mutex_unlock(&ch->lock);
706 return retval;
707 }
708
709 case CHIOMOVE:
710 {
711 struct changer_move mv;
712
713 if (copy_from_user(&mv, argp, sizeof (mv)))
714 return -EFAULT;
715
716 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
717 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
718 DPRINTK("CHIOMOVE: invalid parameter\n");
719 return -EBADSLT;
720 }
721
722 mutex_lock(&ch->lock);
723 retval = ch_move(ch,0,
724 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
725 ch->firsts[mv.cm_totype] + mv.cm_tounit,
726 mv.cm_flags & CM_INVERT);
727 mutex_unlock(&ch->lock);
728 return retval;
729 }
730
731 case CHIOEXCHANGE:
732 {
733 struct changer_exchange mv;
734
735 if (copy_from_user(&mv, argp, sizeof (mv)))
736 return -EFAULT;
737
738 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
739 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
740 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
741 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
742 return -EBADSLT;
743 }
744
745 mutex_lock(&ch->lock);
746 retval = ch_exchange
747 (ch,0,
748 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
749 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
750 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
751 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
752 mutex_unlock(&ch->lock);
753 return retval;
754 }
755
756 case CHIOGSTATUS:
757 {
758 struct changer_element_status ces;
759
760 if (copy_from_user(&ces, argp, sizeof (ces)))
761 return -EFAULT;
762 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
763 return -EINVAL;
764
765 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
766 }
767 #ifdef CONFIG_COMPAT
768 case CHIOGSTATUS32:
769 {
770 struct changer_element_status32 ces32;
771
772 if (copy_from_user(&ces32, argp, sizeof(ces32)))
773 return -EFAULT;
774 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
775 return -EINVAL;
776
777 return ch_gstatus(ch, ces32.ces_type,
778 compat_ptr(ces32.ces_data));
779 }
780 #endif
781 case CHIOGELEM:
782 {
783 struct changer_get_element cge;
784 u_char ch_cmd[12];
785 u_char *buffer;
786 unsigned int elem;
787 int result,i;
788
789 if (copy_from_user(&cge, argp, sizeof (cge)))
790 return -EFAULT;
791
792 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
793 return -EINVAL;
794 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
795
796 buffer = kmalloc(512, GFP_KERNEL);
797 if (!buffer)
798 return -ENOMEM;
799 mutex_lock(&ch->lock);
800
801 voltag_retry:
802 memset(ch_cmd, 0, sizeof(ch_cmd));
803 ch_cmd[0] = READ_ELEMENT_STATUS;
804 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
805 (ch->voltags ? 0x10 : 0) |
806 ch_elem_to_typecode(ch,elem);
807 ch_cmd[2] = (elem >> 8) & 0xff;
808 ch_cmd[3] = elem & 0xff;
809 ch_cmd[5] = 1;
810 ch_cmd[9] = 255;
811
812 result = ch_do_scsi(ch, ch_cmd, 12, buffer, 256, REQ_OP_DRV_IN);
813 if (!result) {
814 cge.cge_status = buffer[18];
815 cge.cge_flags = 0;
816 if (buffer[18] & CESTATUS_EXCEPT) {
817 cge.cge_errno = EIO;
818 }
819 if (buffer[25] & 0x80) {
820 cge.cge_flags |= CGE_SRC;
821 if (buffer[25] & 0x40)
822 cge.cge_flags |= CGE_INVERT;
823 elem = (buffer[26]<<8) | buffer[27];
824 for (i = 0; i < 4; i++) {
825 if (elem >= ch->firsts[i] &&
826 elem < ch->firsts[i] + ch->counts[i]) {
827 cge.cge_srctype = i;
828 cge.cge_srcunit = elem-ch->firsts[i];
829 }
830 }
831 }
832 if ((buffer[22] & 0x30) == 0x30) {
833 cge.cge_flags |= CGE_IDLUN;
834 cge.cge_id = buffer[23];
835 cge.cge_lun = buffer[22] & 7;
836 }
837 if (buffer[9] & 0x80) {
838 cge.cge_flags |= CGE_PVOLTAG;
839 memcpy(cge.cge_pvoltag,buffer+28,36);
840 }
841 if (buffer[9] & 0x40) {
842 cge.cge_flags |= CGE_AVOLTAG;
843 memcpy(cge.cge_avoltag,buffer+64,36);
844 }
845 } else if (ch->voltags) {
846 ch->voltags = 0;
847 VPRINTK(KERN_INFO, "device has no volume tag support\n");
848 goto voltag_retry;
849 }
850 kfree(buffer);
851 mutex_unlock(&ch->lock);
852
853 if (copy_to_user(argp, &cge, sizeof (cge)))
854 return -EFAULT;
855 return result;
856 }
857
858 case CHIOINITELEM:
859 {
860 mutex_lock(&ch->lock);
861 retval = ch_init_elem(ch);
862 mutex_unlock(&ch->lock);
863 return retval;
864 }
865
866 case CHIOSVOLTAG:
867 {
868 struct changer_set_voltag csv;
869 int elem;
870
871 if (copy_from_user(&csv, argp, sizeof(csv)))
872 return -EFAULT;
873
874 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
875 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
876 return -EBADSLT;
877 }
878 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
879 mutex_lock(&ch->lock);
880 retval = ch_set_voltag(ch, elem,
881 csv.csv_flags & CSV_AVOLTAG,
882 csv.csv_flags & CSV_CLEARTAG,
883 csv.csv_voltag);
884 mutex_unlock(&ch->lock);
885 return retval;
886 }
887
888 default:
889 return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd,
890 argp);
891
892 }
893 }
894
895 /* ------------------------------------------------------------------------ */
896
ch_probe(struct device * dev)897 static int ch_probe(struct device *dev)
898 {
899 struct scsi_device *sd = to_scsi_device(dev);
900 struct device *class_dev;
901 int ret;
902 scsi_changer *ch;
903
904 if (sd->type != TYPE_MEDIUM_CHANGER)
905 return -ENODEV;
906
907 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
908 if (NULL == ch)
909 return -ENOMEM;
910
911 idr_preload(GFP_KERNEL);
912 spin_lock(&ch_index_lock);
913 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
914 spin_unlock(&ch_index_lock);
915 idr_preload_end();
916
917 if (ret < 0) {
918 if (ret == -ENOSPC)
919 ret = -ENODEV;
920 goto free_ch;
921 }
922
923 ch->minor = ret;
924 sprintf(ch->name,"ch%d",ch->minor);
925 ret = scsi_device_get(sd);
926 if (ret) {
927 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
928 ch->minor);
929 goto remove_idr;
930 }
931
932 mutex_init(&ch->lock);
933 kref_init(&ch->ref);
934 ch->device = sd;
935 class_dev = device_create(&ch_sysfs_class, dev,
936 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
937 "s%s", ch->name);
938 if (IS_ERR(class_dev)) {
939 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
940 ch->minor);
941 ret = PTR_ERR(class_dev);
942 goto put_device;
943 }
944
945 mutex_lock(&ch->lock);
946 ret = ch_readconfig(ch);
947 if (ret) {
948 mutex_unlock(&ch->lock);
949 goto destroy_dev;
950 }
951 if (init)
952 ch_init_elem(ch);
953
954 mutex_unlock(&ch->lock);
955 dev_set_drvdata(dev, ch);
956 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
957
958 return 0;
959 destroy_dev:
960 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
961 put_device:
962 scsi_device_put(sd);
963 remove_idr:
964 idr_remove(&ch_index_idr, ch->minor);
965 free_ch:
966 kfree(ch);
967 return ret;
968 }
969
ch_remove(struct device * dev)970 static int ch_remove(struct device *dev)
971 {
972 scsi_changer *ch = dev_get_drvdata(dev);
973
974 spin_lock(&ch_index_lock);
975 idr_remove(&ch_index_idr, ch->minor);
976 dev_set_drvdata(dev, NULL);
977 spin_unlock(&ch_index_lock);
978
979 device_destroy(&ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
980 scsi_device_put(ch->device);
981 kref_put(&ch->ref, ch_destroy);
982 return 0;
983 }
984
985 static struct scsi_driver ch_template = {
986 .gendrv = {
987 .name = "ch",
988 .owner = THIS_MODULE,
989 .probe = ch_probe,
990 .remove = ch_remove,
991 },
992 };
993
994 static const struct file_operations changer_fops = {
995 .owner = THIS_MODULE,
996 .open = ch_open,
997 .release = ch_release,
998 .unlocked_ioctl = ch_ioctl,
999 .compat_ioctl = compat_ptr_ioctl,
1000 .llseek = noop_llseek,
1001 };
1002
init_ch_module(void)1003 static int __init init_ch_module(void)
1004 {
1005 int rc;
1006
1007 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1008 rc = class_register(&ch_sysfs_class);
1009 if (rc)
1010 return rc;
1011 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1012 if (rc < 0) {
1013 printk("Unable to get major %d for SCSI-Changer\n",
1014 SCSI_CHANGER_MAJOR);
1015 goto fail1;
1016 }
1017 rc = scsi_register_driver(&ch_template.gendrv);
1018 if (rc < 0)
1019 goto fail2;
1020 return 0;
1021
1022 fail2:
1023 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1024 fail1:
1025 class_unregister(&ch_sysfs_class);
1026 return rc;
1027 }
1028
exit_ch_module(void)1029 static void __exit exit_ch_module(void)
1030 {
1031 scsi_unregister_driver(&ch_template.gendrv);
1032 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1033 class_unregister(&ch_sysfs_class);
1034 idr_destroy(&ch_index_idr);
1035 }
1036
1037 module_init(init_ch_module);
1038 module_exit(exit_ch_module);
1039