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