1
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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
41MODULE_DESCRIPTION("device driver for scsi media changer devices");
42MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
43MODULE_LICENSE("GPL");
44MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
45MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
46
47static DEFINE_MUTEX(ch_mutex);
48static int init = 1;
49module_param(init, int, 0444);
50MODULE_PARM_DESC(init, \
51 "initialize element status on driver load (default: on)");
52
53static int timeout_move = 300;
54module_param(timeout_move, int, 0644);
55MODULE_PARM_DESC(timeout_move,"timeout for move commands "
56 "(default: 300 seconds)");
57
58static int timeout_init = 3600;
59module_param(timeout_init, int, 0644);
60MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
61 "(default: 3600 seconds)");
62
63static int verbose = 1;
64module_param(verbose, int, 0644);
65MODULE_PARM_DESC(verbose,"be verbose (default: on)");
66
67static int debug = 0;
68module_param(debug, int, 0644);
69MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
70 "detailed sense codes on scsi errors (default: off)");
71
72static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
73static int dt_lun[CH_DT_MAX];
74module_param_array(dt_id, int, NULL, 0444);
75module_param_array(dt_lun, int, NULL, 0444);
76
77
78static int vendor_firsts[CH_TYPES-4];
79static int vendor_counts[CH_TYPES-4];
80module_param_array(vendor_firsts, int, NULL, 0444);
81module_param_array(vendor_counts, int, NULL, 0444);
82
83static 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...) \
92do { \
93 if (debug) \
94 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
95} while (0)
96#define VPRINTK(level, fmt, arg...) \
97do { \
98 if (verbose) \
99 ch_printk(level, ch, fmt, ##arg); \
100} while (0)
101
102
103
104#define MAX_RETRIES 1
105
106static struct class * ch_sysfs_class;
107
108typedef 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
122static DEFINE_IDR(ch_index_idr);
123static DEFINE_SPINLOCK(ch_index_lock);
124
125static 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
165static 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
186static int
187ch_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
221static int
222ch_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
235static int
236ch_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
277static int
278ch_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
292static int
293ch_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
421static int
422ch_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
440static int
441ch_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
461static int
462ch_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
487static void
488ch_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
503static int
504ch_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
539static 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
568static 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
576static int
577ch_release(struct inode *inode, struct file *file)
578{
579 scsi_changer *ch = file->private_data;
580
581 scsi_device_put(ch->device);
582 ch->device = NULL;
583 file->private_data = NULL;
584 kref_put(&ch->ref, ch_destroy);
585 return 0;
586}
587
588static int
589ch_open(struct inode *inode, struct file *file)
590{
591 scsi_changer *ch;
592 int minor = iminor(inode);
593
594 mutex_lock(&ch_mutex);
595 spin_lock(&ch_index_lock);
596 ch = idr_find(&ch_index_idr, minor);
597
598 if (NULL == ch || scsi_device_get(ch->device)) {
599 spin_unlock(&ch_index_lock);
600 mutex_unlock(&ch_mutex);
601 return -ENXIO;
602 }
603 kref_get(&ch->ref);
604 spin_unlock(&ch_index_lock);
605
606 file->private_data = ch;
607 mutex_unlock(&ch_mutex);
608 return 0;
609}
610
611static int
612ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
613{
614 if (type >= CH_TYPES || unit >= ch->counts[type])
615 return -1;
616 return 0;
617}
618
619static long ch_ioctl(struct file *file,
620 unsigned int cmd, unsigned long arg)
621{
622 scsi_changer *ch = file->private_data;
623 int retval;
624 void __user *argp = (void __user *)arg;
625
626 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
627 file->f_flags & O_NDELAY);
628 if (retval)
629 return retval;
630
631 switch (cmd) {
632 case CHIOGPARAMS:
633 {
634 struct changer_params params;
635
636 params.cp_curpicker = 0;
637 params.cp_npickers = ch->counts[CHET_MT];
638 params.cp_nslots = ch->counts[CHET_ST];
639 params.cp_nportals = ch->counts[CHET_IE];
640 params.cp_ndrives = ch->counts[CHET_DT];
641
642 if (copy_to_user(argp, ¶ms, sizeof(params)))
643 return -EFAULT;
644 return 0;
645 }
646 case CHIOGVPARAMS:
647 {
648 struct changer_vendor_params vparams;
649
650 memset(&vparams,0,sizeof(vparams));
651 if (ch->counts[CHET_V1]) {
652 vparams.cvp_n1 = ch->counts[CHET_V1];
653 strncpy(vparams.cvp_label1,vendor_labels[0],16);
654 }
655 if (ch->counts[CHET_V2]) {
656 vparams.cvp_n2 = ch->counts[CHET_V2];
657 strncpy(vparams.cvp_label2,vendor_labels[1],16);
658 }
659 if (ch->counts[CHET_V3]) {
660 vparams.cvp_n3 = ch->counts[CHET_V3];
661 strncpy(vparams.cvp_label3,vendor_labels[2],16);
662 }
663 if (ch->counts[CHET_V4]) {
664 vparams.cvp_n4 = ch->counts[CHET_V4];
665 strncpy(vparams.cvp_label4,vendor_labels[3],16);
666 }
667 if (copy_to_user(argp, &vparams, sizeof(vparams)))
668 return -EFAULT;
669 return 0;
670 }
671
672 case CHIOPOSITION:
673 {
674 struct changer_position pos;
675
676 if (copy_from_user(&pos, argp, sizeof (pos)))
677 return -EFAULT;
678
679 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
680 DPRINTK("CHIOPOSITION: invalid parameter\n");
681 return -EBADSLT;
682 }
683 mutex_lock(&ch->lock);
684 retval = ch_position(ch,0,
685 ch->firsts[pos.cp_type] + pos.cp_unit,
686 pos.cp_flags & CP_INVERT);
687 mutex_unlock(&ch->lock);
688 return retval;
689 }
690
691 case CHIOMOVE:
692 {
693 struct changer_move mv;
694
695 if (copy_from_user(&mv, argp, sizeof (mv)))
696 return -EFAULT;
697
698 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
699 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
700 DPRINTK("CHIOMOVE: invalid parameter\n");
701 return -EBADSLT;
702 }
703
704 mutex_lock(&ch->lock);
705 retval = ch_move(ch,0,
706 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
707 ch->firsts[mv.cm_totype] + mv.cm_tounit,
708 mv.cm_flags & CM_INVERT);
709 mutex_unlock(&ch->lock);
710 return retval;
711 }
712
713 case CHIOEXCHANGE:
714 {
715 struct changer_exchange mv;
716
717 if (copy_from_user(&mv, argp, sizeof (mv)))
718 return -EFAULT;
719
720 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
721 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
722 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
723 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
724 return -EBADSLT;
725 }
726
727 mutex_lock(&ch->lock);
728 retval = ch_exchange
729 (ch,0,
730 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
731 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
732 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
733 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
734 mutex_unlock(&ch->lock);
735 return retval;
736 }
737
738 case CHIOGSTATUS:
739 {
740 struct changer_element_status ces;
741
742 if (copy_from_user(&ces, argp, sizeof (ces)))
743 return -EFAULT;
744 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
745 return -EINVAL;
746
747 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
748 }
749
750 case CHIOGELEM:
751 {
752 struct changer_get_element cge;
753 u_char ch_cmd[12];
754 u_char *buffer;
755 unsigned int elem;
756 int result,i;
757
758 if (copy_from_user(&cge, argp, sizeof (cge)))
759 return -EFAULT;
760
761 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
762 return -EINVAL;
763 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
764
765 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
766 if (!buffer)
767 return -ENOMEM;
768 mutex_lock(&ch->lock);
769
770 voltag_retry:
771 memset(ch_cmd, 0, sizeof(ch_cmd));
772 ch_cmd[0] = READ_ELEMENT_STATUS;
773 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
774 (ch->voltags ? 0x10 : 0) |
775 ch_elem_to_typecode(ch,elem);
776 ch_cmd[2] = (elem >> 8) & 0xff;
777 ch_cmd[3] = elem & 0xff;
778 ch_cmd[5] = 1;
779 ch_cmd[9] = 255;
780
781 result = ch_do_scsi(ch, ch_cmd, 12,
782 buffer, 256, DMA_FROM_DEVICE);
783 if (!result) {
784 cge.cge_status = buffer[18];
785 cge.cge_flags = 0;
786 if (buffer[18] & CESTATUS_EXCEPT) {
787 cge.cge_errno = EIO;
788 }
789 if (buffer[25] & 0x80) {
790 cge.cge_flags |= CGE_SRC;
791 if (buffer[25] & 0x40)
792 cge.cge_flags |= CGE_INVERT;
793 elem = (buffer[26]<<8) | buffer[27];
794 for (i = 0; i < 4; i++) {
795 if (elem >= ch->firsts[i] &&
796 elem < ch->firsts[i] + ch->counts[i]) {
797 cge.cge_srctype = i;
798 cge.cge_srcunit = elem-ch->firsts[i];
799 }
800 }
801 }
802 if ((buffer[22] & 0x30) == 0x30) {
803 cge.cge_flags |= CGE_IDLUN;
804 cge.cge_id = buffer[23];
805 cge.cge_lun = buffer[22] & 7;
806 }
807 if (buffer[9] & 0x80) {
808 cge.cge_flags |= CGE_PVOLTAG;
809 memcpy(cge.cge_pvoltag,buffer+28,36);
810 }
811 if (buffer[9] & 0x40) {
812 cge.cge_flags |= CGE_AVOLTAG;
813 memcpy(cge.cge_avoltag,buffer+64,36);
814 }
815 } else if (ch->voltags) {
816 ch->voltags = 0;
817 VPRINTK(KERN_INFO, "device has no volume tag support\n");
818 goto voltag_retry;
819 }
820 kfree(buffer);
821 mutex_unlock(&ch->lock);
822
823 if (copy_to_user(argp, &cge, sizeof (cge)))
824 return -EFAULT;
825 return result;
826 }
827
828 case CHIOINITELEM:
829 {
830 mutex_lock(&ch->lock);
831 retval = ch_init_elem(ch);
832 mutex_unlock(&ch->lock);
833 return retval;
834 }
835
836 case CHIOSVOLTAG:
837 {
838 struct changer_set_voltag csv;
839 int elem;
840
841 if (copy_from_user(&csv, argp, sizeof(csv)))
842 return -EFAULT;
843
844 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
845 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
846 return -EBADSLT;
847 }
848 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
849 mutex_lock(&ch->lock);
850 retval = ch_set_voltag(ch, elem,
851 csv.csv_flags & CSV_AVOLTAG,
852 csv.csv_flags & CSV_CLEARTAG,
853 csv.csv_voltag);
854 mutex_unlock(&ch->lock);
855 return retval;
856 }
857
858 default:
859 return scsi_ioctl(ch->device, cmd, argp);
860
861 }
862}
863
864#ifdef CONFIG_COMPAT
865
866struct changer_element_status32 {
867 int ces_type;
868 compat_uptr_t ces_data;
869};
870#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
871
872static long ch_ioctl_compat(struct file * file,
873 unsigned int cmd, unsigned long arg)
874{
875 scsi_changer *ch = file->private_data;
876
877 switch (cmd) {
878 case CHIOGPARAMS:
879 case CHIOGVPARAMS:
880 case CHIOPOSITION:
881 case CHIOMOVE:
882 case CHIOEXCHANGE:
883 case CHIOGELEM:
884 case CHIOINITELEM:
885 case CHIOSVOLTAG:
886
887 return ch_ioctl(file, cmd, arg);
888 case CHIOGSTATUS32:
889 {
890 struct changer_element_status32 ces32;
891 unsigned char __user *data;
892
893 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
894 return -EFAULT;
895 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
896 return -EINVAL;
897
898 data = compat_ptr(ces32.ces_data);
899 return ch_gstatus(ch, ces32.ces_type, data);
900 }
901 default:
902
903 return -ENOIOCTLCMD;
904
905 }
906}
907#endif
908
909
910
911static int ch_probe(struct device *dev)
912{
913 struct scsi_device *sd = to_scsi_device(dev);
914 struct device *class_dev;
915 int ret;
916 scsi_changer *ch;
917
918 if (sd->type != TYPE_MEDIUM_CHANGER)
919 return -ENODEV;
920
921 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
922 if (NULL == ch)
923 return -ENOMEM;
924
925 idr_preload(GFP_KERNEL);
926 spin_lock(&ch_index_lock);
927 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
928 spin_unlock(&ch_index_lock);
929 idr_preload_end();
930
931 if (ret < 0) {
932 if (ret == -ENOSPC)
933 ret = -ENODEV;
934 goto free_ch;
935 }
936
937 ch->minor = ret;
938 sprintf(ch->name,"ch%d",ch->minor);
939
940 class_dev = device_create(ch_sysfs_class, dev,
941 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
942 "s%s", ch->name);
943 if (IS_ERR(class_dev)) {
944 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
945 ch->minor);
946 ret = PTR_ERR(class_dev);
947 goto remove_idr;
948 }
949
950 mutex_init(&ch->lock);
951 kref_init(&ch->ref);
952 ch->device = sd;
953 ret = ch_readconfig(ch);
954 if (ret)
955 goto destroy_dev;
956 if (init)
957 ch_init_elem(ch);
958
959 dev_set_drvdata(dev, ch);
960 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
961
962 return 0;
963destroy_dev:
964 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
965remove_idr:
966 idr_remove(&ch_index_idr, ch->minor);
967free_ch:
968 kfree(ch);
969 return ret;
970}
971
972static int ch_remove(struct device *dev)
973{
974 scsi_changer *ch = dev_get_drvdata(dev);
975
976 spin_lock(&ch_index_lock);
977 idr_remove(&ch_index_idr, ch->minor);
978 spin_unlock(&ch_index_lock);
979
980 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
981 kref_put(&ch->ref, ch_destroy);
982 return 0;
983}
984
985static 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
994static const struct file_operations changer_fops = {
995 .owner = THIS_MODULE,
996 .open = ch_open,
997 .release = ch_release,
998 .unlocked_ioctl = ch_ioctl,
999#ifdef CONFIG_COMPAT
1000 .compat_ioctl = ch_ioctl_compat,
1001#endif
1002 .llseek = noop_llseek,
1003};
1004
1005static int __init init_ch_module(void)
1006{
1007 int rc;
1008
1009 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1010 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1011 if (IS_ERR(ch_sysfs_class)) {
1012 rc = PTR_ERR(ch_sysfs_class);
1013 return rc;
1014 }
1015 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1016 if (rc < 0) {
1017 printk("Unable to get major %d for SCSI-Changer\n",
1018 SCSI_CHANGER_MAJOR);
1019 goto fail1;
1020 }
1021 rc = scsi_register_driver(&ch_template.gendrv);
1022 if (rc < 0)
1023 goto fail2;
1024 return 0;
1025
1026 fail2:
1027 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1028 fail1:
1029 class_destroy(ch_sysfs_class);
1030 return rc;
1031}
1032
1033static void __exit exit_ch_module(void)
1034{
1035 scsi_unregister_driver(&ch_template.gendrv);
1036 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1037 class_destroy(ch_sysfs_class);
1038 idr_destroy(&ch_index_idr);
1039}
1040
1041module_init(init_ch_module);
1042module_exit(exit_ch_module);
1043
1044
1045
1046
1047
1048
1049
