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[mirror_ubuntu-zesty-kernel.git] / drivers / scsi / ch.c
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
40 MODULE_DESCRIPTION("device driver for scsi media changer devices");
41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42 MODULE_LICENSE("GPL");
43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
45
46 static DEFINE_MUTEX(ch_mutex);
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 = 0;
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_printk(prefix, (ch)->device, "[%s] " fmt, \
89 (ch)->name, ##a)
90
91 #define DPRINTK(fmt, arg...) \
92 do { \
93 if (debug) \
94 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
95 } while (0)
96 #define VPRINTK(level, fmt, arg...) \
97 do { \
98 if (verbose) \
99 ch_printk(level, ch, fmt, ##arg); \
100 } while (0)
101
102 /* ------------------------------------------------------------------- */
103
104 #define MAX_RETRIES 1
105
106 static struct class * ch_sysfs_class;
107
108 typedef struct {
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
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
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
186 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
187 void *buffer, unsigned buflength,
188 enum dma_data_direction direction)
189 {
190 int errno, retries = 0, timeout, result;
191 struct scsi_sense_hdr sshdr;
192
193 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
194 ? timeout_init : timeout_move;
195
196 retry:
197 errno = 0;
198 if (debug) {
199 DPRINTK("command: ");
200 __scsi_print_command(cmd);
201 }
202
203 result = scsi_execute_req(ch->device, cmd, direction, buffer,
204 buflength, &sshdr, timeout * HZ,
205 MAX_RETRIES, NULL);
206
207 DPRINTK("result: 0x%x\n",result);
208 if (driver_byte(result) & DRIVER_SENSE) {
209 if (debug)
210 scsi_print_sense_hdr(ch->name, &sshdr);
211 errno = ch_find_errno(&sshdr);
212
213 switch(sshdr.sense_key) {
214 case UNIT_ATTENTION:
215 ch->unit_attention = 1;
216 if (retries++ < 3)
217 goto retry;
218 break;
219 }
220 }
221 return errno;
222 }
223
224 /* ------------------------------------------------------------------------ */
225
226 static int
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
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 | GFP_DMA);
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, buffer, 256, DMA_FROM_DEVICE))) {
262 if (((buffer[16] << 8) | buffer[17]) != elem) {
263 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
264 elem,(buffer[16] << 8) | buffer[17]);
265 kfree(buffer);
266 return -EIO;
267 }
268 memcpy(data,buffer+16,16);
269 } else {
270 if (ch->voltags) {
271 ch->voltags = 0;
272 VPRINTK(KERN_INFO, "device has no volume tag support\n");
273 goto retry;
274 }
275 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
276 }
277 kfree(buffer);
278 return result;
279 }
280
281 static int
282 ch_init_elem(scsi_changer *ch)
283 {
284 int err;
285 u_char cmd[6];
286
287 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
288 memset(cmd,0,sizeof(cmd));
289 cmd[0] = INITIALIZE_ELEMENT_STATUS;
290 cmd[1] = (ch->device->lun & 0x7) << 5;
291 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
292 VPRINTK(KERN_INFO, "... finished\n");
293 return err;
294 }
295
296 static int
297 ch_readconfig(scsi_changer *ch)
298 {
299 u_char cmd[10], data[16];
300 u_char *buffer;
301 int result,id,lun,i;
302 u_int elem;
303
304 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
305 if (!buffer)
306 return -ENOMEM;
307
308 memset(cmd,0,sizeof(cmd));
309 cmd[0] = MODE_SENSE;
310 cmd[1] = (ch->device->lun & 0x7) << 5;
311 cmd[2] = 0x1d;
312 cmd[4] = 255;
313 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
314 if (0 != result) {
315 cmd[1] |= (1<<3);
316 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
317 }
318 if (0 == result) {
319 ch->firsts[CHET_MT] =
320 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
321 ch->counts[CHET_MT] =
322 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
323 ch->firsts[CHET_ST] =
324 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
325 ch->counts[CHET_ST] =
326 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
327 ch->firsts[CHET_IE] =
328 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
329 ch->counts[CHET_IE] =
330 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
331 ch->firsts[CHET_DT] =
332 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
333 ch->counts[CHET_DT] =
334 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
335 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
336 ch->firsts[CHET_MT],
337 ch->counts[CHET_MT]);
338 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
339 ch->firsts[CHET_ST],
340 ch->counts[CHET_ST]);
341 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
342 ch->firsts[CHET_IE],
343 ch->counts[CHET_IE]);
344 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
345 ch->firsts[CHET_DT],
346 ch->counts[CHET_DT]);
347 } else {
348 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
349 }
350
351 /* vendor specific element types */
352 for (i = 0; i < 4; i++) {
353 if (0 == vendor_counts[i])
354 continue;
355 if (NULL == vendor_labels[i])
356 continue;
357 ch->firsts[CHET_V1+i] = vendor_firsts[i];
358 ch->counts[CHET_V1+i] = vendor_counts[i];
359 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
360 i+5,i+1,vendor_firsts[i],vendor_counts[i],
361 vendor_labels[i]);
362 }
363
364 /* look up the devices of the data transfer elements */
365 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
366 GFP_KERNEL);
367
368 if (!ch->dt) {
369 kfree(buffer);
370 return -ENOMEM;
371 }
372
373 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
374 id = -1;
375 lun = 0;
376 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
377 id = dt_id[elem];
378 lun = dt_lun[elem];
379 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
380 elem+ch->firsts[CHET_DT]);
381 } else if (0 != ch_read_element_status
382 (ch,elem+ch->firsts[CHET_DT],data)) {
383 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
384 elem+ch->firsts[CHET_DT]);
385 } else {
386 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
387 if (data[6] & 0x80) {
388 VPRINTK(KERN_CONT, "not this SCSI bus\n");
389 ch->dt[elem] = NULL;
390 } else if (0 == (data[6] & 0x30)) {
391 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
392 ch->dt[elem] = NULL;
393 } else {
394 id = ch->device->id;
395 lun = 0;
396 if (data[6] & 0x20) id = data[7];
397 if (data[6] & 0x10) lun = data[6] & 7;
398 }
399 }
400 if (-1 != id) {
401 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
402 ch->dt[elem] =
403 scsi_device_lookup(ch->device->host,
404 ch->device->channel,
405 id,lun);
406 if (!ch->dt[elem]) {
407 /* should not happen */
408 VPRINTK(KERN_CONT, "Huh? device not found!\n");
409 } else {
410 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
411 ch->dt[elem]->vendor,
412 ch->dt[elem]->model,
413 ch->dt[elem]->rev);
414 }
415 }
416 }
417 ch->voltags = 1;
418 kfree(buffer);
419
420 return 0;
421 }
422
423 /* ------------------------------------------------------------------------ */
424
425 static int
426 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
427 {
428 u_char cmd[10];
429
430 DPRINTK("position: 0x%x\n",elem);
431 if (0 == trans)
432 trans = ch->firsts[CHET_MT];
433 memset(cmd,0,sizeof(cmd));
434 cmd[0] = POSITION_TO_ELEMENT;
435 cmd[1] = (ch->device->lun & 0x7) << 5;
436 cmd[2] = (trans >> 8) & 0xff;
437 cmd[3] = trans & 0xff;
438 cmd[4] = (elem >> 8) & 0xff;
439 cmd[5] = elem & 0xff;
440 cmd[8] = rotate ? 1 : 0;
441 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
442 }
443
444 static int
445 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
446 {
447 u_char cmd[12];
448
449 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
450 if (0 == trans)
451 trans = ch->firsts[CHET_MT];
452 memset(cmd,0,sizeof(cmd));
453 cmd[0] = MOVE_MEDIUM;
454 cmd[1] = (ch->device->lun & 0x7) << 5;
455 cmd[2] = (trans >> 8) & 0xff;
456 cmd[3] = trans & 0xff;
457 cmd[4] = (src >> 8) & 0xff;
458 cmd[5] = src & 0xff;
459 cmd[6] = (dest >> 8) & 0xff;
460 cmd[7] = dest & 0xff;
461 cmd[10] = rotate ? 1 : 0;
462 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
463 }
464
465 static int
466 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
467 u_int dest1, u_int dest2, int rotate1, int rotate2)
468 {
469 u_char cmd[12];
470
471 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
472 src,dest1,dest2);
473 if (0 == trans)
474 trans = ch->firsts[CHET_MT];
475 memset(cmd,0,sizeof(cmd));
476 cmd[0] = EXCHANGE_MEDIUM;
477 cmd[1] = (ch->device->lun & 0x7) << 5;
478 cmd[2] = (trans >> 8) & 0xff;
479 cmd[3] = trans & 0xff;
480 cmd[4] = (src >> 8) & 0xff;
481 cmd[5] = src & 0xff;
482 cmd[6] = (dest1 >> 8) & 0xff;
483 cmd[7] = dest1 & 0xff;
484 cmd[8] = (dest2 >> 8) & 0xff;
485 cmd[9] = dest2 & 0xff;
486 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
487
488 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
489 }
490
491 static void
492 ch_check_voltag(char *tag)
493 {
494 int i;
495
496 for (i = 0; i < 32; i++) {
497 /* restrict to ascii */
498 if (tag[i] >= 0x7f || tag[i] < 0x20)
499 tag[i] = ' ';
500 /* don't allow search wildcards */
501 if (tag[i] == '?' ||
502 tag[i] == '*')
503 tag[i] = ' ';
504 }
505 }
506
507 static int
508 ch_set_voltag(scsi_changer *ch, u_int elem,
509 int alternate, int clear, u_char *tag)
510 {
511 u_char cmd[12];
512 u_char *buffer;
513 int result;
514
515 buffer = kzalloc(512, GFP_KERNEL);
516 if (!buffer)
517 return -ENOMEM;
518
519 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
520 clear ? "clear" : "set",
521 alternate ? "alternate" : "primary",
522 elem, tag);
523 memset(cmd,0,sizeof(cmd));
524 cmd[0] = SEND_VOLUME_TAG;
525 cmd[1] = ((ch->device->lun & 0x7) << 5) |
526 ch_elem_to_typecode(ch,elem);
527 cmd[2] = (elem >> 8) & 0xff;
528 cmd[3] = elem & 0xff;
529 cmd[5] = clear
530 ? (alternate ? 0x0d : 0x0c)
531 : (alternate ? 0x0b : 0x0a);
532
533 cmd[9] = 255;
534
535 memcpy(buffer,tag,32);
536 ch_check_voltag(buffer);
537
538 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
539 kfree(buffer);
540 return result;
541 }
542
543 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
544 {
545 int retval = 0;
546 u_char data[16];
547 unsigned int i;
548
549 mutex_lock(&ch->lock);
550 for (i = 0; i < ch->counts[type]; i++) {
551 if (0 != ch_read_element_status
552 (ch, ch->firsts[type]+i,data)) {
553 retval = -EIO;
554 break;
555 }
556 put_user(data[2], dest+i);
557 if (data[2] & CESTATUS_EXCEPT)
558 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
559 ch->firsts[type]+i,
560 (int)data[4],(int)data[5]);
561 retval = ch_read_element_status
562 (ch, ch->firsts[type]+i,data);
563 if (0 != retval)
564 break;
565 }
566 mutex_unlock(&ch->lock);
567 return retval;
568 }
569
570 /* ------------------------------------------------------------------------ */
571
572 static int
573 ch_release(struct inode *inode, struct file *file)
574 {
575 scsi_changer *ch = file->private_data;
576
577 scsi_device_put(ch->device);
578 file->private_data = NULL;
579 return 0;
580 }
581
582 static int
583 ch_open(struct inode *inode, struct file *file)
584 {
585 scsi_changer *ch;
586 int minor = iminor(inode);
587
588 mutex_lock(&ch_mutex);
589 spin_lock(&ch_index_lock);
590 ch = idr_find(&ch_index_idr, minor);
591
592 if (NULL == ch || scsi_device_get(ch->device)) {
593 spin_unlock(&ch_index_lock);
594 mutex_unlock(&ch_mutex);
595 return -ENXIO;
596 }
597 spin_unlock(&ch_index_lock);
598
599 file->private_data = ch;
600 mutex_unlock(&ch_mutex);
601 return 0;
602 }
603
604 static int
605 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
606 {
607 if (type >= CH_TYPES || unit >= ch->counts[type])
608 return -1;
609 return 0;
610 }
611
612 static long ch_ioctl(struct file *file,
613 unsigned int cmd, unsigned long arg)
614 {
615 scsi_changer *ch = file->private_data;
616 int retval;
617 void __user *argp = (void __user *)arg;
618
619 switch (cmd) {
620 case CHIOGPARAMS:
621 {
622 struct changer_params params;
623
624 params.cp_curpicker = 0;
625 params.cp_npickers = ch->counts[CHET_MT];
626 params.cp_nslots = ch->counts[CHET_ST];
627 params.cp_nportals = ch->counts[CHET_IE];
628 params.cp_ndrives = ch->counts[CHET_DT];
629
630 if (copy_to_user(argp, &params, sizeof(params)))
631 return -EFAULT;
632 return 0;
633 }
634 case CHIOGVPARAMS:
635 {
636 struct changer_vendor_params vparams;
637
638 memset(&vparams,0,sizeof(vparams));
639 if (ch->counts[CHET_V1]) {
640 vparams.cvp_n1 = ch->counts[CHET_V1];
641 strncpy(vparams.cvp_label1,vendor_labels[0],16);
642 }
643 if (ch->counts[CHET_V2]) {
644 vparams.cvp_n2 = ch->counts[CHET_V2];
645 strncpy(vparams.cvp_label2,vendor_labels[1],16);
646 }
647 if (ch->counts[CHET_V3]) {
648 vparams.cvp_n3 = ch->counts[CHET_V3];
649 strncpy(vparams.cvp_label3,vendor_labels[2],16);
650 }
651 if (ch->counts[CHET_V4]) {
652 vparams.cvp_n4 = ch->counts[CHET_V4];
653 strncpy(vparams.cvp_label4,vendor_labels[3],16);
654 }
655 if (copy_to_user(argp, &vparams, sizeof(vparams)))
656 return -EFAULT;
657 return 0;
658 }
659
660 case CHIOPOSITION:
661 {
662 struct changer_position pos;
663
664 if (copy_from_user(&pos, argp, sizeof (pos)))
665 return -EFAULT;
666
667 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
668 DPRINTK("CHIOPOSITION: invalid parameter\n");
669 return -EBADSLT;
670 }
671 mutex_lock(&ch->lock);
672 retval = ch_position(ch,0,
673 ch->firsts[pos.cp_type] + pos.cp_unit,
674 pos.cp_flags & CP_INVERT);
675 mutex_unlock(&ch->lock);
676 return retval;
677 }
678
679 case CHIOMOVE:
680 {
681 struct changer_move mv;
682
683 if (copy_from_user(&mv, argp, sizeof (mv)))
684 return -EFAULT;
685
686 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
687 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
688 DPRINTK("CHIOMOVE: invalid parameter\n");
689 return -EBADSLT;
690 }
691
692 mutex_lock(&ch->lock);
693 retval = ch_move(ch,0,
694 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
695 ch->firsts[mv.cm_totype] + mv.cm_tounit,
696 mv.cm_flags & CM_INVERT);
697 mutex_unlock(&ch->lock);
698 return retval;
699 }
700
701 case CHIOEXCHANGE:
702 {
703 struct changer_exchange mv;
704
705 if (copy_from_user(&mv, argp, sizeof (mv)))
706 return -EFAULT;
707
708 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
709 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
710 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
711 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
712 return -EBADSLT;
713 }
714
715 mutex_lock(&ch->lock);
716 retval = ch_exchange
717 (ch,0,
718 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
719 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
720 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
721 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
722 mutex_unlock(&ch->lock);
723 return retval;
724 }
725
726 case CHIOGSTATUS:
727 {
728 struct changer_element_status ces;
729
730 if (copy_from_user(&ces, argp, sizeof (ces)))
731 return -EFAULT;
732 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
733 return -EINVAL;
734
735 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
736 }
737
738 case CHIOGELEM:
739 {
740 struct changer_get_element cge;
741 u_char ch_cmd[12];
742 u_char *buffer;
743 unsigned int elem;
744 int result,i;
745
746 if (copy_from_user(&cge, argp, sizeof (cge)))
747 return -EFAULT;
748
749 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
750 return -EINVAL;
751 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
752
753 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
754 if (!buffer)
755 return -ENOMEM;
756 mutex_lock(&ch->lock);
757
758 voltag_retry:
759 memset(ch_cmd, 0, sizeof(ch_cmd));
760 ch_cmd[0] = READ_ELEMENT_STATUS;
761 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
762 (ch->voltags ? 0x10 : 0) |
763 ch_elem_to_typecode(ch,elem);
764 ch_cmd[2] = (elem >> 8) & 0xff;
765 ch_cmd[3] = elem & 0xff;
766 ch_cmd[5] = 1;
767 ch_cmd[9] = 255;
768
769 result = ch_do_scsi(ch, ch_cmd, 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
853 struct 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
859 static 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
898 static 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;
947 remove_idr:
948 idr_remove(&ch_index_idr, ch->minor);
949 free_ch:
950 kfree(ch);
951 return ret;
952 }
953
954 static 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
968 static struct scsi_driver ch_template = {
969 .owner = THIS_MODULE,
970 .gendrv = {
971 .name = "ch",
972 .probe = ch_probe,
973 .remove = ch_remove,
974 },
975 };
976
977 static 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
988 static 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
1016 static 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
1024 module_init(init_ch_module);
1025 module_exit(exit_ch_module);
1026
1027 /*
1028 * Local variables:
1029 * c-basic-offset: 8
1030 * End:
1031 */
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