This source file includes following definitions.
- ch_find_errno
- ch_do_scsi
- ch_elem_to_typecode
- ch_read_element_status
- ch_init_elem
- ch_readconfig
- ch_position
- ch_move
- ch_exchange
- ch_check_voltag
- ch_set_voltag
- ch_gstatus
- ch_destroy
- ch_release
- ch_open
- ch_checkrange
- ch_ioctl
- ch_probe
- ch_remove
- init_ch_module
- exit_ch_module
1
2
3
4
5
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>
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 DEFINE_MUTEX(ch_mutex);
48 static int init = 1;
49 module_param(init, int, 0444);
50 MODULE_PARM_DESC(init, \
51 "initialize element status on driver load (default: on)");
52
53 static int timeout_move = 300;
54 module_param(timeout_move, int, 0644);
55 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
56 "(default: 300 seconds)");
57
58 static int timeout_init = 3600;
59 module_param(timeout_init, int, 0644);
60 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
61 "(default: 3600 seconds)");
62
63 static int verbose = 1;
64 module_param(verbose, int, 0644);
65 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
66
67 static int debug = 0;
68 module_param(debug, int, 0644);
69 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
70 "detailed sense codes on scsi errors (default: off)");
71
72 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
73 static int dt_lun[CH_DT_MAX];
74 module_param_array(dt_id, int, NULL, 0444);
75 module_param_array(dt_lun, int, NULL, 0444);
76
77
78 static int vendor_firsts[CH_TYPES-4];
79 static int vendor_counts[CH_TYPES-4];
80 module_param_array(vendor_firsts, int, NULL, 0444);
81 module_param_array(vendor_counts, int, NULL, 0444);
82
83 static const char * vendor_labels[CH_TYPES-4] = {
84 "v0", "v1", "v2", "v3"
85 };
86
87
88 #define ch_printk(prefix, ch, fmt, a...) \
89 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##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 kref ref;
110 struct list_head list;
111 int minor;
112 char name[8];
113 struct scsi_device *device;
114 struct scsi_device **dt;
115 u_int firsts[CH_TYPES];
116 u_int counts[CH_TYPES];
117 u_int unit_attention;
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
132
133 {
134 .sense = ILLEGAL_REQUEST,
135 .asc = 0x21,
136 .ascq = 0x01,
137 .errno = EBADSLT,
138 },{
139 .sense = ILLEGAL_REQUEST,
140 .asc = 0x28,
141 .ascq = 0x01,
142 .errno = EBADE,
143 },{
144 .sense = ILLEGAL_REQUEST,
145 .asc = 0x3B,
146 .ascq = 0x0D,
147 .errno = EXFULL,
148 },{
149 .sense = ILLEGAL_REQUEST,
150 .asc = 0x3B,
151 .ascq = 0x0E,
152 .errno = EBADE,
153 },{
154 .sense = ILLEGAL_REQUEST,
155 .asc = 0x20,
156 .ascq = 0x00,
157 .errno = EBADRQC,
158 },{
159
160 }
161 };
162
163
164
165 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
166 {
167 int i,errno = 0;
168
169
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
187 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
188 void *buffer, unsigned buflength,
189 enum dma_data_direction direction)
190 {
191 int errno, retries = 0, timeout, result;
192 struct scsi_sense_hdr sshdr;
193
194 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
195 ? timeout_init : timeout_move;
196
197 retry:
198 errno = 0;
199 result = scsi_execute_req(ch->device, cmd, direction, buffer,
200 buflength, &sshdr, timeout * HZ,
201 MAX_RETRIES, NULL);
202
203 if (driver_byte(result) == DRIVER_SENSE) {
204 if (debug)
205 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
206 errno = ch_find_errno(&sshdr);
207
208 switch(sshdr.sense_key) {
209 case UNIT_ATTENTION:
210 ch->unit_attention = 1;
211 if (retries++ < 3)
212 goto retry;
213 break;
214 }
215 }
216 return errno;
217 }
218
219
220
221 static int
222 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
223 {
224 int i;
225
226 for (i = 0; i < CH_TYPES; i++) {
227 if (elem >= ch->firsts[i] &&
228 elem < ch->firsts[i] +
229 ch->counts[i])
230 return i+1;
231 }
232 return 0;
233 }
234
235 static int
236 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
237 {
238 u_char cmd[12];
239 u_char *buffer;
240 int result;
241
242 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
243 if(!buffer)
244 return -ENOMEM;
245
246 retry:
247 memset(cmd,0,sizeof(cmd));
248 cmd[0] = READ_ELEMENT_STATUS;
249 cmd[1] = ((ch->device->lun & 0x7) << 5) |
250 (ch->voltags ? 0x10 : 0) |
251 ch_elem_to_typecode(ch,elem);
252 cmd[2] = (elem >> 8) & 0xff;
253 cmd[3] = elem & 0xff;
254 cmd[5] = 1;
255 cmd[9] = 255;
256 if (0 == (result = ch_do_scsi(ch, cmd, 12,
257 buffer, 256, DMA_FROM_DEVICE))) {
258 if (((buffer[16] << 8) | buffer[17]) != elem) {
259 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
260 elem,(buffer[16] << 8) | buffer[17]);
261 kfree(buffer);
262 return -EIO;
263 }
264 memcpy(data,buffer+16,16);
265 } else {
266 if (ch->voltags) {
267 ch->voltags = 0;
268 VPRINTK(KERN_INFO, "device has no volume tag support\n");
269 goto retry;
270 }
271 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
272 }
273 kfree(buffer);
274 return result;
275 }
276
277 static int
278 ch_init_elem(scsi_changer *ch)
279 {
280 int err;
281 u_char cmd[6];
282
283 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
284 memset(cmd,0,sizeof(cmd));
285 cmd[0] = INITIALIZE_ELEMENT_STATUS;
286 cmd[1] = (ch->device->lun & 0x7) << 5;
287 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
288 VPRINTK(KERN_INFO, "... finished\n");
289 return err;
290 }
291
292 static int
293 ch_readconfig(scsi_changer *ch)
294 {
295 u_char cmd[10], data[16];
296 u_char *buffer;
297 int result,id,lun,i;
298 u_int elem;
299
300 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
301 if (!buffer)
302 return -ENOMEM;
303
304 memset(cmd,0,sizeof(cmd));
305 cmd[0] = MODE_SENSE;
306 cmd[1] = (ch->device->lun & 0x7) << 5;
307 cmd[2] = 0x1d;
308 cmd[4] = 255;
309 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
310 if (0 != result) {
311 cmd[1] |= (1<<3);
312 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
313 }
314 if (0 == result) {
315 ch->firsts[CHET_MT] =
316 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
317 ch->counts[CHET_MT] =
318 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
319 ch->firsts[CHET_ST] =
320 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
321 ch->counts[CHET_ST] =
322 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
323 ch->firsts[CHET_IE] =
324 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
325 ch->counts[CHET_IE] =
326 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
327 ch->firsts[CHET_DT] =
328 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
329 ch->counts[CHET_DT] =
330 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
331 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
332 ch->firsts[CHET_MT],
333 ch->counts[CHET_MT]);
334 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
335 ch->firsts[CHET_ST],
336 ch->counts[CHET_ST]);
337 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
338 ch->firsts[CHET_IE],
339 ch->counts[CHET_IE]);
340 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
341 ch->firsts[CHET_DT],
342 ch->counts[CHET_DT]);
343 } else {
344 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
345 }
346
347
348 for (i = 0; i < 4; i++) {
349 if (0 == vendor_counts[i])
350 continue;
351 if (NULL == vendor_labels[i])
352 continue;
353 ch->firsts[CHET_V1+i] = vendor_firsts[i];
354 ch->counts[CHET_V1+i] = vendor_counts[i];
355 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
356 i+5,i+1,vendor_firsts[i],vendor_counts[i],
357 vendor_labels[i]);
358 }
359
360
361 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
362 GFP_KERNEL);
363
364 if (!ch->dt) {
365 kfree(buffer);
366 return -ENOMEM;
367 }
368
369 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
370 id = -1;
371 lun = 0;
372 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
373 id = dt_id[elem];
374 lun = dt_lun[elem];
375 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
376 elem+ch->firsts[CHET_DT]);
377 } else if (0 != ch_read_element_status
378 (ch,elem+ch->firsts[CHET_DT],data)) {
379 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
380 elem+ch->firsts[CHET_DT]);
381 } else {
382 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
383 if (data[6] & 0x80) {
384 VPRINTK(KERN_CONT, "not this SCSI bus\n");
385 ch->dt[elem] = NULL;
386 } else if (0 == (data[6] & 0x30)) {
387 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
388 ch->dt[elem] = NULL;
389 } else {
390 id = ch->device->id;
391 lun = 0;
392 if (data[6] & 0x20) id = data[7];
393 if (data[6] & 0x10) lun = data[6] & 7;
394 }
395 }
396 if (-1 != id) {
397 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
398 ch->dt[elem] =
399 scsi_device_lookup(ch->device->host,
400 ch->device->channel,
401 id,lun);
402 if (!ch->dt[elem]) {
403
404 VPRINTK(KERN_CONT, "Huh? device not found!\n");
405 } else {
406 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
407 ch->dt[elem]->vendor,
408 ch->dt[elem]->model,
409 ch->dt[elem]->rev);
410 }
411 }
412 }
413 ch->voltags = 1;
414 kfree(buffer);
415
416 return 0;
417 }
418
419
420
421 static int
422 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
423 {
424 u_char cmd[10];
425
426 DPRINTK("position: 0x%x\n",elem);
427 if (0 == trans)
428 trans = ch->firsts[CHET_MT];
429 memset(cmd,0,sizeof(cmd));
430 cmd[0] = POSITION_TO_ELEMENT;
431 cmd[1] = (ch->device->lun & 0x7) << 5;
432 cmd[2] = (trans >> 8) & 0xff;
433 cmd[3] = trans & 0xff;
434 cmd[4] = (elem >> 8) & 0xff;
435 cmd[5] = elem & 0xff;
436 cmd[8] = rotate ? 1 : 0;
437 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
438 }
439
440 static int
441 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
442 {
443 u_char cmd[12];
444
445 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
446 if (0 == trans)
447 trans = ch->firsts[CHET_MT];
448 memset(cmd,0,sizeof(cmd));
449 cmd[0] = MOVE_MEDIUM;
450 cmd[1] = (ch->device->lun & 0x7) << 5;
451 cmd[2] = (trans >> 8) & 0xff;
452 cmd[3] = trans & 0xff;
453 cmd[4] = (src >> 8) & 0xff;
454 cmd[5] = src & 0xff;
455 cmd[6] = (dest >> 8) & 0xff;
456 cmd[7] = dest & 0xff;
457 cmd[10] = rotate ? 1 : 0;
458 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
459 }
460
461 static int
462 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
463 u_int dest1, u_int dest2, int rotate1, int rotate2)
464 {
465 u_char cmd[12];
466
467 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
468 src,dest1,dest2);
469 if (0 == trans)
470 trans = ch->firsts[CHET_MT];
471 memset(cmd,0,sizeof(cmd));
472 cmd[0] = EXCHANGE_MEDIUM;
473 cmd[1] = (ch->device->lun & 0x7) << 5;
474 cmd[2] = (trans >> 8) & 0xff;
475 cmd[3] = trans & 0xff;
476 cmd[4] = (src >> 8) & 0xff;
477 cmd[5] = src & 0xff;
478 cmd[6] = (dest1 >> 8) & 0xff;
479 cmd[7] = dest1 & 0xff;
480 cmd[8] = (dest2 >> 8) & 0xff;
481 cmd[9] = dest2 & 0xff;
482 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
483
484 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
485 }
486
487 static void
488 ch_check_voltag(char *tag)
489 {
490 int i;
491
492 for (i = 0; i < 32; i++) {
493
494 if (tag[i] >= 0x7f || tag[i] < 0x20)
495 tag[i] = ' ';
496
497 if (tag[i] == '?' ||
498 tag[i] == '*')
499 tag[i] = ' ';
500 }
501 }
502
503 static int
504 ch_set_voltag(scsi_changer *ch, u_int elem,
505 int alternate, int clear, u_char *tag)
506 {
507 u_char cmd[12];
508 u_char *buffer;
509 int result;
510
511 buffer = kzalloc(512, GFP_KERNEL);
512 if (!buffer)
513 return -ENOMEM;
514
515 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
516 clear ? "clear" : "set",
517 alternate ? "alternate" : "primary",
518 elem, tag);
519 memset(cmd,0,sizeof(cmd));
520 cmd[0] = SEND_VOLUME_TAG;
521 cmd[1] = ((ch->device->lun & 0x7) << 5) |
522 ch_elem_to_typecode(ch,elem);
523 cmd[2] = (elem >> 8) & 0xff;
524 cmd[3] = elem & 0xff;
525 cmd[5] = clear
526 ? (alternate ? 0x0d : 0x0c)
527 : (alternate ? 0x0b : 0x0a);
528
529 cmd[9] = 255;
530
531 memcpy(buffer,tag,32);
532 ch_check_voltag(buffer);
533
534 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
535 kfree(buffer);
536 return result;
537 }
538
539 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
540 {
541 int retval = 0;
542 u_char data[16];
543 unsigned int i;
544
545 mutex_lock(&ch->lock);
546 for (i = 0; i < ch->counts[type]; i++) {
547 if (0 != ch_read_element_status
548 (ch, ch->firsts[type]+i,data)) {
549 retval = -EIO;
550 break;
551 }
552 put_user(data[2], dest+i);
553 if (data[2] & CESTATUS_EXCEPT)
554 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
555 ch->firsts[type]+i,
556 (int)data[4],(int)data[5]);
557 retval = ch_read_element_status
558 (ch, ch->firsts[type]+i,data);
559 if (0 != retval)
560 break;
561 }
562 mutex_unlock(&ch->lock);
563 return retval;
564 }
565
566
567
568 static void ch_destroy(struct kref *ref)
569 {
570 scsi_changer *ch = container_of(ref, scsi_changer, ref);
571
572 kfree(ch->dt);
573 kfree(ch);
574 }
575
576 static int
577 ch_release(struct inode *inode, struct file *file)
578 {
579 scsi_changer *ch = file->private_data;
580
581 scsi_device_put(ch->device);
582 file->private_data = NULL;
583 kref_put(&ch->ref, ch_destroy);
584 return 0;
585 }
586
587 static int
588 ch_open(struct inode *inode, struct file *file)
589 {
590 scsi_changer *ch;
591 int minor = iminor(inode);
592
593 mutex_lock(&ch_mutex);
594 spin_lock(&ch_index_lock);
595 ch = idr_find(&ch_index_idr, minor);
596
597 if (NULL == ch || scsi_device_get(ch->device)) {
598 spin_unlock(&ch_index_lock);
599 mutex_unlock(&ch_mutex);
600 return -ENXIO;
601 }
602 kref_get(&ch->ref);
603 spin_unlock(&ch_index_lock);
604
605 file->private_data = ch;
606 mutex_unlock(&ch_mutex);
607 return 0;
608 }
609
610 static int
611 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
612 {
613 if (type >= CH_TYPES || unit >= ch->counts[type])
614 return -1;
615 return 0;
616 }
617
618 static long ch_ioctl(struct file *file,
619 unsigned int cmd, unsigned long arg)
620 {
621 scsi_changer *ch = file->private_data;
622 int retval;
623 void __user *argp = (void __user *)arg;
624
625 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
626 file->f_flags & O_NDELAY);
627 if (retval)
628 return retval;
629
630 switch (cmd) {
631 case CHIOGPARAMS:
632 {
633 struct changer_params params;
634
635 params.cp_curpicker = 0;
636 params.cp_npickers = ch->counts[CHET_MT];
637 params.cp_nslots = ch->counts[CHET_ST];
638 params.cp_nportals = ch->counts[CHET_IE];
639 params.cp_ndrives = ch->counts[CHET_DT];
640
641 if (copy_to_user(argp, ¶ms, sizeof(params)))
642 return -EFAULT;
643 return 0;
644 }
645 case CHIOGVPARAMS:
646 {
647 struct changer_vendor_params vparams;
648
649 memset(&vparams,0,sizeof(vparams));
650 if (ch->counts[CHET_V1]) {
651 vparams.cvp_n1 = ch->counts[CHET_V1];
652 strncpy(vparams.cvp_label1,vendor_labels[0],16);
653 }
654 if (ch->counts[CHET_V2]) {
655 vparams.cvp_n2 = ch->counts[CHET_V2];
656 strncpy(vparams.cvp_label2,vendor_labels[1],16);
657 }
658 if (ch->counts[CHET_V3]) {
659 vparams.cvp_n3 = ch->counts[CHET_V3];
660 strncpy(vparams.cvp_label3,vendor_labels[2],16);
661 }
662 if (ch->counts[CHET_V4]) {
663 vparams.cvp_n4 = ch->counts[CHET_V4];
664 strncpy(vparams.cvp_label4,vendor_labels[3],16);
665 }
666 if (copy_to_user(argp, &vparams, sizeof(vparams)))
667 return -EFAULT;
668 return 0;
669 }
670
671 case CHIOPOSITION:
672 {
673 struct changer_position pos;
674
675 if (copy_from_user(&pos, argp, sizeof (pos)))
676 return -EFAULT;
677
678 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
679 DPRINTK("CHIOPOSITION: invalid parameter\n");
680 return -EBADSLT;
681 }
682 mutex_lock(&ch->lock);
683 retval = ch_position(ch,0,
684 ch->firsts[pos.cp_type] + pos.cp_unit,
685 pos.cp_flags & CP_INVERT);
686 mutex_unlock(&ch->lock);
687 return retval;
688 }
689
690 case CHIOMOVE:
691 {
692 struct changer_move mv;
693
694 if (copy_from_user(&mv, argp, sizeof (mv)))
695 return -EFAULT;
696
697 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
698 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
699 DPRINTK("CHIOMOVE: invalid parameter\n");
700 return -EBADSLT;
701 }
702
703 mutex_lock(&ch->lock);
704 retval = ch_move(ch,0,
705 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
706 ch->firsts[mv.cm_totype] + mv.cm_tounit,
707 mv.cm_flags & CM_INVERT);
708 mutex_unlock(&ch->lock);
709 return retval;
710 }
711
712 case CHIOEXCHANGE:
713 {
714 struct changer_exchange mv;
715
716 if (copy_from_user(&mv, argp, sizeof (mv)))
717 return -EFAULT;
718
719 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
720 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
721 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
722 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
723 return -EBADSLT;
724 }
725
726 mutex_lock(&ch->lock);
727 retval = ch_exchange
728 (ch,0,
729 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
730 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
731 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
732 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
733 mutex_unlock(&ch->lock);
734 return retval;
735 }
736
737 case CHIOGSTATUS:
738 {
739 struct changer_element_status ces;
740
741 if (copy_from_user(&ces, argp, sizeof (ces)))
742 return -EFAULT;
743 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
744 return -EINVAL;
745
746 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
747 }
748
749 case CHIOGELEM:
750 {
751 struct changer_get_element cge;
752 u_char ch_cmd[12];
753 u_char *buffer;
754 unsigned int elem;
755 int result,i;
756
757 if (copy_from_user(&cge, argp, sizeof (cge)))
758 return -EFAULT;
759
760 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
761 return -EINVAL;
762 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
763
764 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
765 if (!buffer)
766 return -ENOMEM;
767 mutex_lock(&ch->lock);
768
769 voltag_retry:
770 memset(ch_cmd, 0, sizeof(ch_cmd));
771 ch_cmd[0] = READ_ELEMENT_STATUS;
772 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
773 (ch->voltags ? 0x10 : 0) |
774 ch_elem_to_typecode(ch,elem);
775 ch_cmd[2] = (elem >> 8) & 0xff;
776 ch_cmd[3] = elem & 0xff;
777 ch_cmd[5] = 1;
778 ch_cmd[9] = 255;
779
780 result = ch_do_scsi(ch, ch_cmd, 12,
781 buffer, 256, DMA_FROM_DEVICE);
782 if (!result) {
783 cge.cge_status = buffer[18];
784 cge.cge_flags = 0;
785 if (buffer[18] & CESTATUS_EXCEPT) {
786 cge.cge_errno = EIO;
787 }
788 if (buffer[25] & 0x80) {
789 cge.cge_flags |= CGE_SRC;
790 if (buffer[25] & 0x40)
791 cge.cge_flags |= CGE_INVERT;
792 elem = (buffer[26]<<8) | buffer[27];
793 for (i = 0; i < 4; i++) {
794 if (elem >= ch->firsts[i] &&
795 elem < ch->firsts[i] + ch->counts[i]) {
796 cge.cge_srctype = i;
797 cge.cge_srcunit = elem-ch->firsts[i];
798 }
799 }
800 }
801 if ((buffer[22] & 0x30) == 0x30) {
802 cge.cge_flags |= CGE_IDLUN;
803 cge.cge_id = buffer[23];
804 cge.cge_lun = buffer[22] & 7;
805 }
806 if (buffer[9] & 0x80) {
807 cge.cge_flags |= CGE_PVOLTAG;
808 memcpy(cge.cge_pvoltag,buffer+28,36);
809 }
810 if (buffer[9] & 0x40) {
811 cge.cge_flags |= CGE_AVOLTAG;
812 memcpy(cge.cge_avoltag,buffer+64,36);
813 }
814 } else if (ch->voltags) {
815 ch->voltags = 0;
816 VPRINTK(KERN_INFO, "device has no volume tag support\n");
817 goto voltag_retry;
818 }
819 kfree(buffer);
820 mutex_unlock(&ch->lock);
821
822 if (copy_to_user(argp, &cge, sizeof (cge)))
823 return -EFAULT;
824 return result;
825 }
826
827 case CHIOINITELEM:
828 {
829 mutex_lock(&ch->lock);
830 retval = ch_init_elem(ch);
831 mutex_unlock(&ch->lock);
832 return retval;
833 }
834
835 case CHIOSVOLTAG:
836 {
837 struct changer_set_voltag csv;
838 int elem;
839
840 if (copy_from_user(&csv, argp, sizeof(csv)))
841 return -EFAULT;
842
843 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
844 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
845 return -EBADSLT;
846 }
847 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
848 mutex_lock(&ch->lock);
849 retval = ch_set_voltag(ch, elem,
850 csv.csv_flags & CSV_AVOLTAG,
851 csv.csv_flags & CSV_CLEARTAG,
852 csv.csv_voltag);
853 mutex_unlock(&ch->lock);
854 return retval;
855 }
856
857 default:
858 return scsi_ioctl(ch->device, cmd, argp);
859
860 }
861 }
862
863 #ifdef CONFIG_COMPAT
864
865 struct changer_element_status32 {
866 int ces_type;
867 compat_uptr_t ces_data;
868 };
869 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
870
871 static long ch_ioctl_compat(struct file * file,
872 unsigned int cmd, unsigned long arg)
873 {
874 scsi_changer *ch = file->private_data;
875
876 switch (cmd) {
877 case CHIOGPARAMS:
878 case CHIOGVPARAMS:
879 case CHIOPOSITION:
880 case CHIOMOVE:
881 case CHIOEXCHANGE:
882 case CHIOGELEM:
883 case CHIOINITELEM:
884 case CHIOSVOLTAG:
885
886 return ch_ioctl(file, cmd, arg);
887 case CHIOGSTATUS32:
888 {
889 struct changer_element_status32 ces32;
890 unsigned char __user *data;
891
892 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
893 return -EFAULT;
894 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
895 return -EINVAL;
896
897 data = compat_ptr(ces32.ces_data);
898 return ch_gstatus(ch, ces32.ces_type, data);
899 }
900 default:
901
902 return -ENOIOCTLCMD;
903
904 }
905 }
906 #endif
907
908
909
910 static int ch_probe(struct device *dev)
911 {
912 struct scsi_device *sd = to_scsi_device(dev);
913 struct device *class_dev;
914 int ret;
915 scsi_changer *ch;
916
917 if (sd->type != TYPE_MEDIUM_CHANGER)
918 return -ENODEV;
919
920 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
921 if (NULL == ch)
922 return -ENOMEM;
923
924 idr_preload(GFP_KERNEL);
925 spin_lock(&ch_index_lock);
926 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
927 spin_unlock(&ch_index_lock);
928 idr_preload_end();
929
930 if (ret < 0) {
931 if (ret == -ENOSPC)
932 ret = -ENODEV;
933 goto free_ch;
934 }
935
936 ch->minor = ret;
937 sprintf(ch->name,"ch%d",ch->minor);
938
939 class_dev = device_create(ch_sysfs_class, dev,
940 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
941 "s%s", ch->name);
942 if (IS_ERR(class_dev)) {
943 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
944 ch->minor);
945 ret = PTR_ERR(class_dev);
946 goto remove_idr;
947 }
948
949 mutex_init(&ch->lock);
950 kref_init(&ch->ref);
951 ch->device = sd;
952 ret = ch_readconfig(ch);
953 if (ret)
954 goto destroy_dev;
955 if (init)
956 ch_init_elem(ch);
957
958 dev_set_drvdata(dev, ch);
959 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
960
961 return 0;
962 destroy_dev:
963 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
964 remove_idr:
965 idr_remove(&ch_index_idr, ch->minor);
966 free_ch:
967 kfree(ch);
968 return ret;
969 }
970
971 static int ch_remove(struct device *dev)
972 {
973 scsi_changer *ch = dev_get_drvdata(dev);
974
975 spin_lock(&ch_index_lock);
976 idr_remove(&ch_index_idr, ch->minor);
977 spin_unlock(&ch_index_lock);
978
979 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
980 kref_put(&ch->ref, ch_destroy);
981 return 0;
982 }
983
984 static struct scsi_driver ch_template = {
985 .gendrv = {
986 .name = "ch",
987 .owner = THIS_MODULE,
988 .probe = ch_probe,
989 .remove = ch_remove,
990 },
991 };
992
993 static const struct file_operations changer_fops = {
994 .owner = THIS_MODULE,
995 .open = ch_open,
996 .release = ch_release,
997 .unlocked_ioctl = ch_ioctl,
998 #ifdef CONFIG_COMPAT
999 .compat_ioctl = ch_ioctl_compat,
1000 #endif
1001 .llseek = noop_llseek,
1002 };
1003
1004 static int __init init_ch_module(void)
1005 {
1006 int rc;
1007
1008 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1009 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1010 if (IS_ERR(ch_sysfs_class)) {
1011 rc = PTR_ERR(ch_sysfs_class);
1012 return rc;
1013 }
1014 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1015 if (rc < 0) {
1016 printk("Unable to get major %d for SCSI-Changer\n",
1017 SCSI_CHANGER_MAJOR);
1018 goto fail1;
1019 }
1020 rc = scsi_register_driver(&ch_template.gendrv);
1021 if (rc < 0)
1022 goto fail2;
1023 return 0;
1024
1025 fail2:
1026 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1027 fail1:
1028 class_destroy(ch_sysfs_class);
1029 return rc;
1030 }
1031
1032 static void __exit exit_ch_module(void)
1033 {
1034 scsi_unregister_driver(&ch_template.gendrv);
1035 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1036 class_destroy(ch_sysfs_class);
1037 idr_destroy(&ch_index_idr);
1038 }
1039
1040 module_init(init_ch_module);
1041 module_exit(exit_ch_module);
1042
1043
1044
1045
1046
1047