1
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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
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 int init = 1;
48module_param(init, int, 0444);
49MODULE_PARM_DESC(init, \
50 "initialize element status on driver load (default: on)");
51
52static int timeout_move = 300;
53module_param(timeout_move, int, 0644);
54MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55 "(default: 300 seconds)");
56
57static int timeout_init = 3600;
58module_param(timeout_init, int, 0644);
59MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60 "(default: 3600 seconds)");
61
62static int verbose = 1;
63module_param(verbose, int, 0644);
64MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66static int debug = 0;
67module_param(debug, int, 0644);
68MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69 "detailed sense codes on scsi errors (default: off)");
70
71static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72static int dt_lun[CH_DT_MAX];
73module_param_array(dt_id, int, NULL, 0444);
74module_param_array(dt_lun, int, NULL, 0444);
75
76
77static int vendor_firsts[CH_TYPES-4];
78static int vendor_counts[CH_TYPES-4];
79module_param_array(vendor_firsts, int, NULL, 0444);
80module_param_array(vendor_counts, int, NULL, 0444);
81
82static const char * vendor_labels[CH_TYPES-4] = {
83 "v0", "v1", "v2", "v3"
84};
85
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...) \
91do { \
92 if (debug) \
93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
94} while (0)
95#define VPRINTK(level, fmt, arg...) \
96do { \
97 if (verbose) \
98 ch_printk(level, ch, fmt, ##arg); \
99} while (0)
100
101
102
103#define MAX_RETRIES 1
104
105static struct class * ch_sysfs_class;
106
107typedef struct {
108 struct kref ref;
109 struct list_head list;
110 int minor;
111 char name[8];
112 struct scsi_device *device;
113 struct scsi_device **dt;
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
121static DEFINE_IDR(ch_index_idr);
122static DEFINE_SPINLOCK(ch_index_lock);
123
124static const struct {
125 unsigned char sense;
126 unsigned char asc;
127 unsigned char ascq;
128 int errno;
129} ch_err[] = {
130
131
132 {
133 .sense = ILLEGAL_REQUEST,
134 .asc = 0x21,
135 .ascq = 0x01,
136 .errno = EBADSLT,
137 },{
138 .sense = ILLEGAL_REQUEST,
139 .asc = 0x28,
140 .ascq = 0x01,
141 .errno = EBADE,
142 },{
143 .sense = ILLEGAL_REQUEST,
144 .asc = 0x3B,
145 .ascq = 0x0D,
146 .errno = EXFULL,
147 },{
148 .sense = ILLEGAL_REQUEST,
149 .asc = 0x3B,
150 .ascq = 0x0E,
151 .errno = EBADE,
152 },{
153 .sense = ILLEGAL_REQUEST,
154 .asc = 0x20,
155 .ascq = 0x00,
156 .errno = EBADRQC,
157 },{
158
159 }
160};
161
162
163
164static int ch_find_errno(struct scsi_sense_hdr *sshdr)
165{
166 int i,errno = 0;
167
168
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
185static int
186ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
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 result = scsi_execute_req(ch->device, cmd, direction, buffer,
199 buflength, &sshdr, timeout * HZ,
200 MAX_RETRIES, NULL);
201
202 if (driver_byte(result) == DRIVER_SENSE) {
203 if (debug)
204 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
205 errno = ch_find_errno(&sshdr);
206
207 switch(sshdr.sense_key) {
208 case UNIT_ATTENTION:
209 ch->unit_attention = 1;
210 if (retries++ < 3)
211 goto retry;
212 break;
213 }
214 }
215 return errno;
216}
217
218
219
220static int
221ch_elem_to_typecode(scsi_changer *ch, u_int elem)
222{
223 int i;
224
225 for (i = 0; i < CH_TYPES; i++) {
226 if (elem >= ch->firsts[i] &&
227 elem < ch->firsts[i] +
228 ch->counts[i])
229 return i+1;
230 }
231 return 0;
232}
233
234static int
235ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
236{
237 u_char cmd[12];
238 u_char *buffer;
239 int result;
240
241 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
242 if(!buffer)
243 return -ENOMEM;
244
245 retry:
246 memset(cmd,0,sizeof(cmd));
247 cmd[0] = READ_ELEMENT_STATUS;
248 cmd[1] = ((ch->device->lun & 0x7) << 5) |
249 (ch->voltags ? 0x10 : 0) |
250 ch_elem_to_typecode(ch,elem);
251 cmd[2] = (elem >> 8) & 0xff;
252 cmd[3] = elem & 0xff;
253 cmd[5] = 1;
254 cmd[9] = 255;
255 if (0 == (result = ch_do_scsi(ch, cmd, 12,
256 buffer, 256, DMA_FROM_DEVICE))) {
257 if (((buffer[16] << 8) | buffer[17]) != elem) {
258 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
259 elem,(buffer[16] << 8) | buffer[17]);
260 kfree(buffer);
261 return -EIO;
262 }
263 memcpy(data,buffer+16,16);
264 } else {
265 if (ch->voltags) {
266 ch->voltags = 0;
267 VPRINTK(KERN_INFO, "device has no volume tag support\n");
268 goto retry;
269 }
270 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
271 }
272 kfree(buffer);
273 return result;
274}
275
276static int
277ch_init_elem(scsi_changer *ch)
278{
279 int err;
280 u_char cmd[6];
281
282 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
283 memset(cmd,0,sizeof(cmd));
284 cmd[0] = INITIALIZE_ELEMENT_STATUS;
285 cmd[1] = (ch->device->lun & 0x7) << 5;
286 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
287 VPRINTK(KERN_INFO, "... finished\n");
288 return err;
289}
290
291static int
292ch_readconfig(scsi_changer *ch)
293{
294 u_char cmd[10], data[16];
295 u_char *buffer;
296 int result,id,lun,i;
297 u_int elem;
298
299 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
300 if (!buffer)
301 return -ENOMEM;
302
303 memset(cmd,0,sizeof(cmd));
304 cmd[0] = MODE_SENSE;
305 cmd[1] = (ch->device->lun & 0x7) << 5;
306 cmd[2] = 0x1d;
307 cmd[4] = 255;
308 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
309 if (0 != result) {
310 cmd[1] |= (1<<3);
311 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
312 }
313 if (0 == result) {
314 ch->firsts[CHET_MT] =
315 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
316 ch->counts[CHET_MT] =
317 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
318 ch->firsts[CHET_ST] =
319 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
320 ch->counts[CHET_ST] =
321 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
322 ch->firsts[CHET_IE] =
323 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
324 ch->counts[CHET_IE] =
325 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
326 ch->firsts[CHET_DT] =
327 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
328 ch->counts[CHET_DT] =
329 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
330 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
331 ch->firsts[CHET_MT],
332 ch->counts[CHET_MT]);
333 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
334 ch->firsts[CHET_ST],
335 ch->counts[CHET_ST]);
336 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
337 ch->firsts[CHET_IE],
338 ch->counts[CHET_IE]);
339 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
340 ch->firsts[CHET_DT],
341 ch->counts[CHET_DT]);
342 } else {
343 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
344 }
345
346
347 for (i = 0; i < 4; i++) {
348 if (0 == vendor_counts[i])
349 continue;
350 if (NULL == vendor_labels[i])
351 continue;
352 ch->firsts[CHET_V1+i] = vendor_firsts[i];
353 ch->counts[CHET_V1+i] = vendor_counts[i];
354 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
355 i+5,i+1,vendor_firsts[i],vendor_counts[i],
356 vendor_labels[i]);
357 }
358
359
360 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
361 GFP_KERNEL);
362
363 if (!ch->dt) {
364 kfree(buffer);
365 return -ENOMEM;
366 }
367
368 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
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 ch->dt[elem] = NULL;
385 } else if (0 == (data[6] & 0x30)) {
386 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
387 ch->dt[elem] = NULL;
388 } else {
389 id = ch->device->id;
390 lun = 0;
391 if (data[6] & 0x20) id = data[7];
392 if (data[6] & 0x10) lun = data[6] & 7;
393 }
394 }
395 if (-1 != id) {
396 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
397 ch->dt[elem] =
398 scsi_device_lookup(ch->device->host,
399 ch->device->channel,
400 id,lun);
401 if (!ch->dt[elem]) {
402
403 VPRINTK(KERN_CONT, "Huh? device not found!\n");
404 } else {
405 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
406 ch->dt[elem]->vendor,
407 ch->dt[elem]->model,
408 ch->dt[elem]->rev);
409 }
410 }
411 }
412 ch->voltags = 1;
413 kfree(buffer);
414
415 return 0;
416}
417
418
419
420static int
421ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
422{
423 u_char cmd[10];
424
425 DPRINTK("position: 0x%x\n",elem);
426 if (0 == trans)
427 trans = ch->firsts[CHET_MT];
428 memset(cmd,0,sizeof(cmd));
429 cmd[0] = POSITION_TO_ELEMENT;
430 cmd[1] = (ch->device->lun & 0x7) << 5;
431 cmd[2] = (trans >> 8) & 0xff;
432 cmd[3] = trans & 0xff;
433 cmd[4] = (elem >> 8) & 0xff;
434 cmd[5] = elem & 0xff;
435 cmd[8] = rotate ? 1 : 0;
436 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
437}
438
439static int
440ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
441{
442 u_char cmd[12];
443
444 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
445 if (0 == trans)
446 trans = ch->firsts[CHET_MT];
447 memset(cmd,0,sizeof(cmd));
448 cmd[0] = MOVE_MEDIUM;
449 cmd[1] = (ch->device->lun & 0x7) << 5;
450 cmd[2] = (trans >> 8) & 0xff;
451 cmd[3] = trans & 0xff;
452 cmd[4] = (src >> 8) & 0xff;
453 cmd[5] = src & 0xff;
454 cmd[6] = (dest >> 8) & 0xff;
455 cmd[7] = dest & 0xff;
456 cmd[10] = rotate ? 1 : 0;
457 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
458}
459
460static int
461ch_exchange(scsi_changer *ch, u_int trans, u_int src,
462 u_int dest1, u_int dest2, int rotate1, int rotate2)
463{
464 u_char cmd[12];
465
466 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
467 src,dest1,dest2);
468 if (0 == trans)
469 trans = ch->firsts[CHET_MT];
470 memset(cmd,0,sizeof(cmd));
471 cmd[0] = EXCHANGE_MEDIUM;
472 cmd[1] = (ch->device->lun & 0x7) << 5;
473 cmd[2] = (trans >> 8) & 0xff;
474 cmd[3] = trans & 0xff;
475 cmd[4] = (src >> 8) & 0xff;
476 cmd[5] = src & 0xff;
477 cmd[6] = (dest1 >> 8) & 0xff;
478 cmd[7] = dest1 & 0xff;
479 cmd[8] = (dest2 >> 8) & 0xff;
480 cmd[9] = dest2 & 0xff;
481 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
482
483 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
484}
485
486static void
487ch_check_voltag(char *tag)
488{
489 int i;
490
491 for (i = 0; i < 32; i++) {
492
493 if (tag[i] >= 0x7f || tag[i] < 0x20)
494 tag[i] = ' ';
495
496 if (tag[i] == '?' ||
497 tag[i] == '*')
498 tag[i] = ' ';
499 }
500}
501
502static int
503ch_set_voltag(scsi_changer *ch, u_int elem,
504 int alternate, int clear, u_char *tag)
505{
506 u_char cmd[12];
507 u_char *buffer;
508 int result;
509
510 buffer = kzalloc(512, GFP_KERNEL);
511 if (!buffer)
512 return -ENOMEM;
513
514 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
515 clear ? "clear" : "set",
516 alternate ? "alternate" : "primary",
517 elem, tag);
518 memset(cmd,0,sizeof(cmd));
519 cmd[0] = SEND_VOLUME_TAG;
520 cmd[1] = ((ch->device->lun & 0x7) << 5) |
521 ch_elem_to_typecode(ch,elem);
522 cmd[2] = (elem >> 8) & 0xff;
523 cmd[3] = elem & 0xff;
524 cmd[5] = clear
525 ? (alternate ? 0x0d : 0x0c)
526 : (alternate ? 0x0b : 0x0a);
527
528 cmd[9] = 255;
529
530 memcpy(buffer,tag,32);
531 ch_check_voltag(buffer);
532
533 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
534 kfree(buffer);
535 return result;
536}
537
538static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
539{
540 int retval = 0;
541 u_char data[16];
542 unsigned int i;
543
544 mutex_lock(&ch->lock);
545 for (i = 0; i < ch->counts[type]; i++) {
546 if (0 != ch_read_element_status
547 (ch, ch->firsts[type]+i,data)) {
548 retval = -EIO;
549 break;
550 }
551 put_user(data[2], dest+i);
552 if (data[2] & CESTATUS_EXCEPT)
553 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
554 ch->firsts[type]+i,
555 (int)data[4],(int)data[5]);
556 retval = ch_read_element_status
557 (ch, ch->firsts[type]+i,data);
558 if (0 != retval)
559 break;
560 }
561 mutex_unlock(&ch->lock);
562 return retval;
563}
564
565
566
567static void ch_destroy(struct kref *ref)
568{
569 scsi_changer *ch = container_of(ref, scsi_changer, ref);
570
571 ch->device = NULL;
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 file->private_data = NULL;
583 kref_put(&ch->ref, ch_destroy);
584 return 0;
585}
586
587static int
588ch_open(struct inode *inode, struct file *file)
589{
590 scsi_changer *ch;
591 int minor = iminor(inode);
592
593 spin_lock(&ch_index_lock);
594 ch = idr_find(&ch_index_idr, minor);
595
596 if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
597 spin_unlock(&ch_index_lock);
598 return -ENXIO;
599 }
600 spin_unlock(&ch_index_lock);
601 if (scsi_device_get(ch->device)) {
602 kref_put(&ch->ref, ch_destroy);
603 return -ENXIO;
604 }
605
606 mutex_lock(&ch->lock);
607 file->private_data = ch;
608 mutex_unlock(&ch->lock);
609 return 0;
610}
611
612static int
613ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
614{
615 if (type >= CH_TYPES || unit >= ch->counts[type])
616 return -1;
617 return 0;
618}
619
620static long ch_ioctl(struct file *file,
621 unsigned int cmd, unsigned long arg)
622{
623 scsi_changer *ch = file->private_data;
624 int retval;
625 void __user *argp = (void __user *)arg;
626
627 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
628 file->f_flags & O_NDELAY);
629 if (retval)
630 return retval;
631
632 switch (cmd) {
633 case CHIOGPARAMS:
634 {
635 struct changer_params params;
636
637 params.cp_curpicker = 0;
638 params.cp_npickers = ch->counts[CHET_MT];
639 params.cp_nslots = ch->counts[CHET_ST];
640 params.cp_nportals = ch->counts[CHET_IE];
641 params.cp_ndrives = ch->counts[CHET_DT];
642
643 if (copy_to_user(argp, ¶ms, sizeof(params)))
644 return -EFAULT;
645 return 0;
646 }
647 case CHIOGVPARAMS:
648 {
649 struct changer_vendor_params vparams;
650
651 memset(&vparams,0,sizeof(vparams));
652 if (ch->counts[CHET_V1]) {
653 vparams.cvp_n1 = ch->counts[CHET_V1];
654 strncpy(vparams.cvp_label1,vendor_labels[0],16);
655 }
656 if (ch->counts[CHET_V2]) {
657 vparams.cvp_n2 = ch->counts[CHET_V2];
658 strncpy(vparams.cvp_label2,vendor_labels[1],16);
659 }
660 if (ch->counts[CHET_V3]) {
661 vparams.cvp_n3 = ch->counts[CHET_V3];
662 strncpy(vparams.cvp_label3,vendor_labels[2],16);
663 }
664 if (ch->counts[CHET_V4]) {
665 vparams.cvp_n4 = ch->counts[CHET_V4];
666 strncpy(vparams.cvp_label4,vendor_labels[3],16);
667 }
668 if (copy_to_user(argp, &vparams, sizeof(vparams)))
669 return -EFAULT;
670 return 0;
671 }
672
673 case CHIOPOSITION:
674 {
675 struct changer_position pos;
676
677 if (copy_from_user(&pos, argp, sizeof (pos)))
678 return -EFAULT;
679
680 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
681 DPRINTK("CHIOPOSITION: invalid parameter\n");
682 return -EBADSLT;
683 }
684 mutex_lock(&ch->lock);
685 retval = ch_position(ch,0,
686 ch->firsts[pos.cp_type] + pos.cp_unit,
687 pos.cp_flags & CP_INVERT);
688 mutex_unlock(&ch->lock);
689 return retval;
690 }
691
692 case CHIOMOVE:
693 {
694 struct changer_move mv;
695
696 if (copy_from_user(&mv, argp, sizeof (mv)))
697 return -EFAULT;
698
699 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
700 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
701 DPRINTK("CHIOMOVE: invalid parameter\n");
702 return -EBADSLT;
703 }
704
705 mutex_lock(&ch->lock);
706 retval = ch_move(ch,0,
707 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
708 ch->firsts[mv.cm_totype] + mv.cm_tounit,
709 mv.cm_flags & CM_INVERT);
710 mutex_unlock(&ch->lock);
711 return retval;
712 }
713
714 case CHIOEXCHANGE:
715 {
716 struct changer_exchange mv;
717
718 if (copy_from_user(&mv, argp, sizeof (mv)))
719 return -EFAULT;
720
721 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
722 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
723 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
724 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
725 return -EBADSLT;
726 }
727
728 mutex_lock(&ch->lock);
729 retval = ch_exchange
730 (ch,0,
731 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
732 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
733 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
734 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
735 mutex_unlock(&ch->lock);
736 return retval;
737 }
738
739 case CHIOGSTATUS:
740 {
741 struct changer_element_status ces;
742
743 if (copy_from_user(&ces, argp, sizeof (ces)))
744 return -EFAULT;
745 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
746 return -EINVAL;
747
748 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
749 }
750
751 case CHIOGELEM:
752 {
753 struct changer_get_element cge;
754 u_char ch_cmd[12];
755 u_char *buffer;
756 unsigned int elem;
757 int result,i;
758
759 if (copy_from_user(&cge, argp, sizeof (cge)))
760 return -EFAULT;
761
762 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
763 return -EINVAL;
764 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
765
766 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
767 if (!buffer)
768 return -ENOMEM;
769 mutex_lock(&ch->lock);
770
771 voltag_retry:
772 memset(ch_cmd, 0, sizeof(ch_cmd));
773 ch_cmd[0] = READ_ELEMENT_STATUS;
774 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
775 (ch->voltags ? 0x10 : 0) |
776 ch_elem_to_typecode(ch,elem);
777 ch_cmd[2] = (elem >> 8) & 0xff;
778 ch_cmd[3] = elem & 0xff;
779 ch_cmd[5] = 1;
780 ch_cmd[9] = 255;
781
782 result = ch_do_scsi(ch, ch_cmd, 12,
783 buffer, 256, DMA_FROM_DEVICE);
784 if (!result) {
785 cge.cge_status = buffer[18];
786 cge.cge_flags = 0;
787 if (buffer[18] & CESTATUS_EXCEPT) {
788 cge.cge_errno = EIO;
789 }
790 if (buffer[25] & 0x80) {
791 cge.cge_flags |= CGE_SRC;
792 if (buffer[25] & 0x40)
793 cge.cge_flags |= CGE_INVERT;
794 elem = (buffer[26]<<8) | buffer[27];
795 for (i = 0; i < 4; i++) {
796 if (elem >= ch->firsts[i] &&
797 elem < ch->firsts[i] + ch->counts[i]) {
798 cge.cge_srctype = i;
799 cge.cge_srcunit = elem-ch->firsts[i];
800 }
801 }
802 }
803 if ((buffer[22] & 0x30) == 0x30) {
804 cge.cge_flags |= CGE_IDLUN;
805 cge.cge_id = buffer[23];
806 cge.cge_lun = buffer[22] & 7;
807 }
808 if (buffer[9] & 0x80) {
809 cge.cge_flags |= CGE_PVOLTAG;
810 memcpy(cge.cge_pvoltag,buffer+28,36);
811 }
812 if (buffer[9] & 0x40) {
813 cge.cge_flags |= CGE_AVOLTAG;
814 memcpy(cge.cge_avoltag,buffer+64,36);
815 }
816 } else if (ch->voltags) {
817 ch->voltags = 0;
818 VPRINTK(KERN_INFO, "device has no volume tag support\n");
819 goto voltag_retry;
820 }
821 kfree(buffer);
822 mutex_unlock(&ch->lock);
823
824 if (copy_to_user(argp, &cge, sizeof (cge)))
825 return -EFAULT;
826 return result;
827 }
828
829 case CHIOINITELEM:
830 {
831 mutex_lock(&ch->lock);
832 retval = ch_init_elem(ch);
833 mutex_unlock(&ch->lock);
834 return retval;
835 }
836
837 case CHIOSVOLTAG:
838 {
839 struct changer_set_voltag csv;
840 int elem;
841
842 if (copy_from_user(&csv, argp, sizeof(csv)))
843 return -EFAULT;
844
845 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
846 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
847 return -EBADSLT;
848 }
849 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
850 mutex_lock(&ch->lock);
851 retval = ch_set_voltag(ch, elem,
852 csv.csv_flags & CSV_AVOLTAG,
853 csv.csv_flags & CSV_CLEARTAG,
854 csv.csv_voltag);
855 mutex_unlock(&ch->lock);
856 return retval;
857 }
858
859 default:
860 return scsi_ioctl(ch->device, cmd, argp);
861
862 }
863}
864
865#ifdef CONFIG_COMPAT
866
867struct changer_element_status32 {
868 int ces_type;
869 compat_uptr_t ces_data;
870};
871#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
872
873static long ch_ioctl_compat(struct file * file,
874 unsigned int cmd, unsigned long arg)
875{
876 scsi_changer *ch = file->private_data;
877 int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
878 file->f_flags & O_NDELAY);
879 if (retval)
880 return retval;
881
882 switch (cmd) {
883 case CHIOGPARAMS:
884 case CHIOGVPARAMS:
885 case CHIOPOSITION:
886 case CHIOMOVE:
887 case CHIOEXCHANGE:
888 case CHIOGELEM:
889 case CHIOINITELEM:
890 case CHIOSVOLTAG:
891
892 return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
893 case CHIOGSTATUS32:
894 {
895 struct changer_element_status32 ces32;
896 unsigned char __user *data;
897
898 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
899 return -EFAULT;
900 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
901 return -EINVAL;
902
903 data = compat_ptr(ces32.ces_data);
904 return ch_gstatus(ch, ces32.ces_type, data);
905 }
906 default:
907 return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
908
909 }
910}
911#endif
912
913
914
915static int ch_probe(struct device *dev)
916{
917 struct scsi_device *sd = to_scsi_device(dev);
918 struct device *class_dev;
919 int ret;
920 scsi_changer *ch;
921
922 if (sd->type != TYPE_MEDIUM_CHANGER)
923 return -ENODEV;
924
925 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
926 if (NULL == ch)
927 return -ENOMEM;
928
929 idr_preload(GFP_KERNEL);
930 spin_lock(&ch_index_lock);
931 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
932 spin_unlock(&ch_index_lock);
933 idr_preload_end();
934
935 if (ret < 0) {
936 if (ret == -ENOSPC)
937 ret = -ENODEV;
938 goto free_ch;
939 }
940
941 ch->minor = ret;
942 sprintf(ch->name,"ch%d",ch->minor);
943 ret = scsi_device_get(sd);
944 if (ret) {
945 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
946 ch->minor);
947 goto remove_idr;
948 }
949
950 mutex_init(&ch->lock);
951 kref_init(&ch->ref);
952 ch->device = sd;
953 class_dev = device_create(ch_sysfs_class, dev,
954 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
955 "s%s", ch->name);
956 if (IS_ERR(class_dev)) {
957 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
958 ch->minor);
959 ret = PTR_ERR(class_dev);
960 goto put_device;
961 }
962
963 mutex_lock(&ch->lock);
964 ret = ch_readconfig(ch);
965 if (ret) {
966 mutex_unlock(&ch->lock);
967 goto destroy_dev;
968 }
969 if (init)
970 ch_init_elem(ch);
971
972 mutex_unlock(&ch->lock);
973 dev_set_drvdata(dev, ch);
974 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
975
976 return 0;
977destroy_dev:
978 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
979put_device:
980 scsi_device_put(sd);
981remove_idr:
982 idr_remove(&ch_index_idr, ch->minor);
983free_ch:
984 kfree(ch);
985 return ret;
986}
987
988static int ch_remove(struct device *dev)
989{
990 scsi_changer *ch = dev_get_drvdata(dev);
991
992 spin_lock(&ch_index_lock);
993 idr_remove(&ch_index_idr, ch->minor);
994 dev_set_drvdata(dev, NULL);
995 spin_unlock(&ch_index_lock);
996
997 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
998 scsi_device_put(ch->device);
999 kref_put(&ch->ref, ch_destroy);
1000 return 0;
1001}
1002
1003static struct scsi_driver ch_template = {
1004 .gendrv = {
1005 .name = "ch",
1006 .owner = THIS_MODULE,
1007 .probe = ch_probe,
1008 .remove = ch_remove,
1009 },
1010};
1011
1012static const struct file_operations changer_fops = {
1013 .owner = THIS_MODULE,
1014 .open = ch_open,
1015 .release = ch_release,
1016 .unlocked_ioctl = ch_ioctl,
1017#ifdef CONFIG_COMPAT
1018 .compat_ioctl = ch_ioctl_compat,
1019#endif
1020 .llseek = noop_llseek,
1021};
1022
1023static int __init init_ch_module(void)
1024{
1025 int rc;
1026
1027 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1028 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1029 if (IS_ERR(ch_sysfs_class)) {
1030 rc = PTR_ERR(ch_sysfs_class);
1031 return rc;
1032 }
1033 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1034 if (rc < 0) {
1035 printk("Unable to get major %d for SCSI-Changer\n",
1036 SCSI_CHANGER_MAJOR);
1037 goto fail1;
1038 }
1039 rc = scsi_register_driver(&ch_template.gendrv);
1040 if (rc < 0)
1041 goto fail2;
1042 return 0;
1043
1044 fail2:
1045 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1046 fail1:
1047 class_destroy(ch_sysfs_class);
1048 return rc;
1049}
1050
1051static void __exit exit_ch_module(void)
1052{
1053 scsi_unregister_driver(&ch_template.gendrv);
1054 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1055 class_destroy(ch_sysfs_class);
1056 idr_destroy(&ch_index_idr);
1057}
1058
1059module_init(init_ch_module);
1060module_exit(exit_ch_module);
1061
1062
1063
1064
1065
1066
1067
