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[SCSI] add scsi changer driver
[deliverable/linux.git] / drivers / scsi / ch.c
CommitLineData
daa6eda6
GK		 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/config.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/fs.h>
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/mm.h>
17#include <linux/major.h>
18#include <linux/string.h>
19#include <linux/errno.h>
20#include <linux/interrupt.h>
21#include <linux/blkdev.h>
22#include <linux/completion.h>
23#include <linux/devfs_fs_kernel.h>
24#include <linux/ioctl32.h>
25#include <linux/compat.h>
26#include <linux/chio.h> /* here are all the ioctls */
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_request.h>
35#include <scsi/scsi_dbg.h>
36
37#define CH_DT_MAX 16
38#define CH_TYPES 8
39
40MODULE_DESCRIPTION("device driver for scsi media changer devices");
41MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42MODULE_LICENSE("GPL");
43
44static int init = 1;
45module_param(init, int, 0444);
46MODULE_PARM_DESC(init, \
47 "initialize element status on driver load (default: on)");
48
49static int timeout_move = 300;
50module_param(timeout_move, int, 0644);
51MODULE_PARM_DESC(timeout_move,"timeout for move commands "
52 "(default: 300 seconds)");
53
54static int timeout_init = 3600;
55module_param(timeout_init, int, 0644);
56MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
57 "(default: 3600 seconds)");
58
59static int verbose = 1;
60module_param(verbose, int, 0644);
61MODULE_PARM_DESC(verbose,"be verbose (default: on)");
62
63static int debug = 0;
64module_param(debug, int, 0644);
65MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
66 "detailed sense codes on scsi errors (default: off)");
67
68static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
69static int dt_lun[CH_DT_MAX];
70module_param_array(dt_id, int, NULL, 0444);
71module_param_array(dt_lun, int, NULL, 0444);
72
73/* tell the driver about vendor-specific slots */
74static int vendor_firsts[CH_TYPES-4];
75static int vendor_counts[CH_TYPES-4];
76module_param_array(vendor_firsts, int, NULL, 0444);
77module_param_array(vendor_counts, int, NULL, 0444);
78
79static char *vendor_labels[CH_TYPES-4] = {
80 "v0", "v1", "v2", "v3"
81};
82// module_param_string_array(vendor_labels, NULL, 0444);
83
84#define dprintk(fmt, arg...) if (debug) \
85 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
86#define vprintk(fmt, arg...) if (verbose) \
87 printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
88
89/* ------------------------------------------------------------------- */
90
91#define MAX_RETRIES 1
92
93static int ch_probe(struct device *);
94static int ch_remove(struct device *);
95static int ch_open(struct inode * inode, struct file * filp);
96static int ch_release(struct inode * inode, struct file * filp);
97static int ch_ioctl(struct inode * inode, struct file * filp,
98 unsigned int cmd, unsigned long arg);
99#ifdef CONFIG_COMPAT
100static long ch_ioctl_compat(struct file * filp,
101 unsigned int cmd, unsigned long arg);
102#endif
103
104static struct class_simple * ch_sysfs_class;
105
106typedef struct {
107 struct list_head list;
108 int minor;
109 char name[8];
110 struct scsi_device *device;
111 struct scsi_device **dt; /* ptrs to data transfer elements */
112 u_int firsts[CH_TYPES];
113 u_int counts[CH_TYPES];
114 u_int unit_attention;
115 u_int voltags;
116 struct semaphore lock;
117} scsi_changer;
118
119static LIST_HEAD(ch_devlist);
120static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED;
121static int ch_devcount;
122
123static struct scsi_driver ch_template =
124{
125 .owner = THIS_MODULE,
126 .gendrv = {
127 .name = "ch",
128 .probe = ch_probe,
129 .remove = ch_remove,
130 },
131};
132
133static struct file_operations changer_fops =
134{
135 .owner = THIS_MODULE,
136 .open = ch_open,
137 .release = ch_release,
138 .ioctl = ch_ioctl,
139#ifdef CONFIG_COMPAT
140 .compat_ioctl = ch_ioctl_compat,
141#endif
142};
143
144static struct {
145 unsigned char sense;
146 unsigned char asc;
147 unsigned char ascq;
148 int errno;
149} err[] = {
150/* Just filled in what looks right. Hav'nt checked any standard paper for
151 these errno assignments, so they may be wrong... */
152 {
153 .sense = ILLEGAL_REQUEST,
154 .asc = 0x21,
155 .ascq = 0x01,
156 .errno = EBADSLT, /* Invalid element address */
157 },{
158 .sense = ILLEGAL_REQUEST,
159 .asc = 0x28,
160 .ascq = 0x01,
161 .errno = EBADE, /* Import or export element accessed */
162 },{
163 .sense = ILLEGAL_REQUEST,
164 .asc = 0x3B,
165 .ascq = 0x0D,
166 .errno = EXFULL, /* Medium destination element full */
167 },{
168 .sense = ILLEGAL_REQUEST,
169 .asc = 0x3B,
170 .ascq = 0x0E,
171 .errno = EBADE, /* Medium source element empty */
172 },{
173 .sense = ILLEGAL_REQUEST,
174 .asc = 0x20,
175 .ascq = 0x00,
176 .errno = EBADRQC, /* Invalid command operation code */
177 },{
178 /* end of list */
179 }
180};
181
182/* ------------------------------------------------------------------- */
183
184static int ch_find_errno(unsigned char *sense_buffer)
185{
186 int i,errno = 0;
187
188 /* Check to see if additional sense information is available */
189 if (sense_buffer[7] > 5 &&
190 sense_buffer[12] != 0) {
191 for (i = 0; err[i].errno != 0; i++) {
192 if (err[i].sense == sense_buffer[ 2] &&
193 err[i].asc == sense_buffer[12] &&
194 err[i].ascq == sense_buffer[13]) {
195 errno = -err[i].errno;
196 break;
197 }
198 }
199 }
200 if (errno == 0)
201 errno = -EIO;
202 return errno;
203}
204
205static int
206ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
207 void *buffer, unsigned buflength,
208 enum dma_data_direction direction)
209{
210 int errno, retries = 0, timeout;
211 struct scsi_request *sr;
212
213 sr = scsi_allocate_request(ch->device, GFP_KERNEL);
214 if (NULL == sr)
215 return -ENOMEM;
216
217 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
218 ? timeout_init : timeout_move;
219
220 retry:
221 errno = 0;
222 if (debug) {
223 dprintk("command: ");
224 __scsi_print_command(cmd);
225 }
226
227 scsi_wait_req(sr, cmd, buffer, buflength,
228 timeout * HZ, MAX_RETRIES);
229
230 dprintk("result: 0x%x\n",sr->sr_result);
231 if (driver_byte(sr->sr_result) & DRIVER_SENSE) {
232 if (debug)
233 scsi_print_req_sense(ch->name, sr);
234 errno = ch_find_errno(sr->sr_sense_buffer);
235
236 switch(sr->sr_sense_buffer[2] & 0xf) {
237 case UNIT_ATTENTION:
238 ch->unit_attention = 1;
239 if (retries++ < 3)
240 goto retry;
241 break;
242 }
243 }
244 scsi_release_request(sr);
245 return errno;
246}
247
248/* ------------------------------------------------------------------------ */
249
250static int
251ch_elem_to_typecode(scsi_changer *ch, u_int elem)
252{
253 int i;
254
255 for (i = 0; i < CH_TYPES; i++) {
256 if (elem >= ch->firsts[i] &&
257 elem < ch->firsts[i] +
258 ch->counts[i])
259 return i+1;
260 }
261 return 0;
262}
263
264static int
265ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
266{
267 u_char cmd[12];
268 u_char *buffer;
269 int result;
270
271 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
272 if(!buffer)
273 return -ENOMEM;
274
275 retry:
276 memset(cmd,0,sizeof(cmd));
277 cmd[0] = READ_ELEMENT_STATUS;
278 cmd[1] = (ch->device->lun << 5) |
279 (ch->voltags ? 0x10 : 0) |
280 ch_elem_to_typecode(ch,elem);
281 cmd[2] = (elem >> 8) & 0xff;
282 cmd[3] = elem & 0xff;
283 cmd[5] = 1;
284 cmd[9] = 255;
285 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
286 if (((buffer[16] << 8) | buffer[17]) != elem) {
287 dprintk("asked for element 0x%02x, got 0x%02x\n",
288 elem,(buffer[16] << 8) | buffer[17]);
289 kfree(buffer);
290 return -EIO;
291 }
292 memcpy(data,buffer+16,16);
293 } else {
294 if (ch->voltags) {
295 ch->voltags = 0;
296 vprintk("device has no volume tag support\n");
297 goto retry;
298 }
299 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
300 }
301 kfree(buffer);
302 return result;
303}
304
305static int
306ch_init_elem(scsi_changer *ch)
307{
308 int err;
309 u_char cmd[6];
310
311 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
312 memset(cmd,0,sizeof(cmd));
313 cmd[0] = INITIALIZE_ELEMENT_STATUS;
314 cmd[1] = ch->device->lun << 5;
315 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
316 vprintk("... finished\n");
317 return err;
318}
319
320static int
321ch_readconfig(scsi_changer *ch)
322{
323 u_char cmd[10], data[16];
324 u_char *buffer;
325 int result,id,lun,i;
326 u_int elem;
327
328 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
329 if (!buffer)
330 return -ENOMEM;
331 memset(buffer,0,512);
332
333 memset(cmd,0,sizeof(cmd));
334 cmd[0] = MODE_SENSE;
335 cmd[1] = ch->device->lun << 5;
336 cmd[2] = 0x1d;
337 cmd[4] = 255;
338 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
339 if (0 != result) {
340 cmd[1] |= (1<<3);
341 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
342 }
343 if (0 == result) {
344 ch->firsts[CHET_MT] =
345 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
346 ch->counts[CHET_MT] =
347 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
348 ch->firsts[CHET_ST] =
349 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
350 ch->counts[CHET_ST] =
351 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
352 ch->firsts[CHET_IE] =
353 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
354 ch->counts[CHET_IE] =
355 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
356 ch->firsts[CHET_DT] =
357 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
358 ch->counts[CHET_DT] =
359 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
360 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
361 ch->firsts[CHET_MT],
362 ch->counts[CHET_MT]);
363 vprintk("type #2 (st): 0x%x+%d [storage]\n",
364 ch->firsts[CHET_ST],
365 ch->counts[CHET_ST]);
366 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
367 ch->firsts[CHET_IE],
368 ch->counts[CHET_IE]);
369 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
370 ch->firsts[CHET_DT],
371 ch->counts[CHET_DT]);
372 } else {
373 vprintk("reading element address assigment page failed!\n");
374 }
375
376 /* vendor specific element types */
377 for (i = 0; i < 4; i++) {
378 if (0 == vendor_counts[i])
379 continue;
380 if (NULL == vendor_labels[i])
381 continue;
382 ch->firsts[CHET_V1+i] = vendor_firsts[i];
383 ch->counts[CHET_V1+i] = vendor_counts[i];
384 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
385 i+5,i+1,vendor_firsts[i],vendor_counts[i],
386 vendor_labels[i]);
387 }
388
389 /* look up the devices of the data transfer elements */
390 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
391 GFP_KERNEL);
392 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
393 id = -1;
394 lun = 0;
395 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
396 id = dt_id[elem];
397 lun = dt_lun[elem];
398 vprintk("dt 0x%x: [insmod option] ",
399 elem+ch->firsts[CHET_DT]);
400 } else if (0 != ch_read_element_status
401 (ch,elem+ch->firsts[CHET_DT],data)) {
402 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
403 elem+ch->firsts[CHET_DT]);
404 } else {
405 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
406 if (data[6] & 0x80) {
407 if (verbose)
408 printk("not this SCSI bus\n");
409 ch->dt[elem] = NULL;
410 } else if (0 == (data[6] & 0x30)) {
411 if (verbose)
412 printk("ID/LUN unknown\n");
413 ch->dt[elem] = NULL;
414 } else {
415 id = ch->device->id;
416 lun = 0;
417 if (data[6] & 0x20) id = data[7];
418 if (data[6] & 0x10) lun = data[6] & 7;
419 }
420 }
421 if (-1 != id) {
422 if (verbose)
423 printk("ID %i, LUN %i, ",id,lun);
424 ch->dt[elem] =
425 scsi_device_lookup(ch->device->host,
426 ch->device->channel,
427 id,lun);
428 if (!ch->dt[elem]) {
429 /* should not happen */
430 if (verbose)
431 printk("Huh? device not found!\n");
432 } else {
433 if (verbose)
434 printk("name: %8.8s %16.16s %4.4s\n",
435 ch->dt[elem]->vendor,
436 ch->dt[elem]->model,
437 ch->dt[elem]->rev);
438 }
439 }
440 }
441 ch->voltags = 1;
442 kfree(buffer);
443
444 return 0;
445}
446
447/* ------------------------------------------------------------------------ */
448
449static int
450ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
451{
452 u_char cmd[10];
453
454 dprintk("position: 0x%x\n",elem);
455 if (0 == trans)
456 trans = ch->firsts[CHET_MT];
457 memset(cmd,0,sizeof(cmd));
458 cmd[0] = POSITION_TO_ELEMENT;
459 cmd[1] = ch->device->lun << 5;
460 cmd[2] = (trans >> 8) & 0xff;
461 cmd[3] = trans & 0xff;
462 cmd[4] = (elem >> 8) & 0xff;
463 cmd[5] = elem & 0xff;
464 cmd[8] = rotate ? 1 : 0;
465 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
466}
467
468static int
469ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
470{
471 u_char cmd[12];
472
473 dprintk("move: 0x%x => 0x%x\n",src,dest);
474 if (0 == trans)
475 trans = ch->firsts[CHET_MT];
476 memset(cmd,0,sizeof(cmd));
477 cmd[0] = MOVE_MEDIUM;
478 cmd[1] = ch->device->lun << 5;
479 cmd[2] = (trans >> 8) & 0xff;
480 cmd[3] = trans & 0xff;
481 cmd[4] = (src >> 8) & 0xff;
482 cmd[5] = src & 0xff;
483 cmd[6] = (dest >> 8) & 0xff;
484 cmd[7] = dest & 0xff;
485 cmd[10] = rotate ? 1 : 0;
486 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
487}
488
489static int
490ch_exchange(scsi_changer *ch, u_int trans, u_int src,
491 u_int dest1, u_int dest2, int rotate1, int rotate2)
492{
493 u_char cmd[12];
494
495 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
496 src,dest1,dest2);
497 if (0 == trans)
498 trans = ch->firsts[CHET_MT];
499 memset(cmd,0,sizeof(cmd));
500 cmd[0] = EXCHANGE_MEDIUM;
501 cmd[1] = ch->device->lun << 5;
502 cmd[2] = (trans >> 8) & 0xff;
503 cmd[3] = trans & 0xff;
504 cmd[4] = (src >> 8) & 0xff;
505 cmd[5] = src & 0xff;
506 cmd[6] = (dest1 >> 8) & 0xff;
507 cmd[7] = dest1 & 0xff;
508 cmd[8] = (dest2 >> 8) & 0xff;
509 cmd[9] = dest2 & 0xff;
510 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
511
512 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
513}
514
515static void
516ch_check_voltag(char *tag)
517{
518 int i;
519
520 for (i = 0; i < 32; i++) {
521 /* restrict to ascii */
522 if (tag[i] >= 0x7f || tag[i] < 0x20)
523 tag[i] = ' ';
524 /* don't allow search wildcards */
525 if (tag[i] == '?' ||
526 tag[i] == '*')
527 tag[i] = ' ';
528 }
529}
530
531static int
532ch_set_voltag(scsi_changer *ch, u_int elem,
533 int alternate, int clear, u_char *tag)
534{
535 u_char cmd[12];
536 u_char *buffer;
537 int result;
538
539 buffer = kmalloc(512, GFP_KERNEL);
540 if (!buffer)
541 return -ENOMEM;
542 memset(buffer,0,512);
543
544 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
545 clear ? "clear" : "set",
546 alternate ? "alternate" : "primary",
547 elem, tag);
548 memset(cmd,0,sizeof(cmd));
549 cmd[0] = SEND_VOLUME_TAG;
550 cmd[1] = (ch->device->lun << 5) |
551 ch_elem_to_typecode(ch,elem);
552 cmd[2] = (elem >> 8) & 0xff;
553 cmd[3] = elem & 0xff;
554 cmd[5] = clear
555 ? (alternate ? 0x0d : 0x0c)
556 : (alternate ? 0x0b : 0x0a);
557
558 cmd[9] = 255;
559
560 memcpy(buffer,tag,32);
561 ch_check_voltag(buffer);
562
563 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
564 kfree(buffer);
565 return result;
566}
567
568static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest)
569{
570 int retval = 0;
571 u_char data[16];
572 unsigned int i;
573
574 down(&ch->lock);
575 for (i = 0; i < ch->counts[type]; i++) {
576 if (0 != ch_read_element_status
577 (ch, ch->firsts[type]+i,data)) {
578 retval = -EIO;
579 break;
580 }
581 put_user(data[2], dest+i);
582 if (data[2] & CESTATUS_EXCEPT)
583 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
584 ch->firsts[type]+i,
585 (int)data[4],(int)data[5]);
586 retval = ch_read_element_status
587 (ch, ch->firsts[type]+i,data);
588 if (0 != retval)
589 break;
590 }
591 up(&ch->lock);
592 return retval;
593}
594
595/* ------------------------------------------------------------------------ */
596
597static int
598ch_release(struct inode *inode, struct file *file)
599{
600 scsi_changer *ch = file->private_data;
601
602 scsi_device_put(ch->device);
603 file->private_data = NULL;
604 return 0;
605}
606
607static int
608ch_open(struct inode *inode, struct file *file)
609{
610 scsi_changer *tmp, *ch;
611 int minor = iminor(inode);
612
613 spin_lock(&ch_devlist_lock);
614 ch = NULL;
615 list_for_each_entry(tmp,&ch_devlist,list) {
616 if (tmp->minor == minor)
617 ch = tmp;
618 }
619 if (NULL == ch || scsi_device_get(ch->device)) {
620 spin_unlock(&ch_devlist_lock);
621 return -ENXIO;
622 }
623 spin_unlock(&ch_devlist_lock);
624
625 file->private_data = ch;
626 return 0;
627}
628
629static int
630ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
631{
632 if (type >= CH_TYPES || unit >= ch->counts[type])
633 return -1;
634 return 0;
635}
636
637static int ch_ioctl(struct inode * inode, struct file * file,
638 unsigned int cmd, unsigned long arg)
639{
640 scsi_changer *ch = file->private_data;
641 int retval;
642
643 switch (cmd) {
644 case CHIOGPARAMS:
645 {
646 struct changer_params params;
647
648 params.cp_curpicker = 0;
649 params.cp_npickers = ch->counts[CHET_MT];
650 params.cp_nslots = ch->counts[CHET_ST];
651 params.cp_nportals = ch->counts[CHET_IE];
652 params.cp_ndrives = ch->counts[CHET_DT];
653
654 if (copy_to_user((void *) arg, &params, sizeof(params)))
655 return -EFAULT;
656 return 0;
657 }
658 case CHIOGVPARAMS:
659 {
660 struct changer_vendor_params vparams;
661
662 memset(&vparams,0,sizeof(vparams));
663 if (ch->counts[CHET_V1]) {
664 vparams.cvp_n1 = ch->counts[CHET_V1];
665 strncpy(vparams.cvp_label1,vendor_labels[0],16);
666 }
667 if (ch->counts[CHET_V2]) {
668 vparams.cvp_n2 = ch->counts[CHET_V2];
669 strncpy(vparams.cvp_label2,vendor_labels[1],16);
670 }
671 if (ch->counts[CHET_V3]) {
672 vparams.cvp_n3 = ch->counts[CHET_V3];
673 strncpy(vparams.cvp_label3,vendor_labels[2],16);
674 }
675 if (ch->counts[CHET_V4]) {
676 vparams.cvp_n4 = ch->counts[CHET_V4];
677 strncpy(vparams.cvp_label4,vendor_labels[3],16);
678 }
679 if (copy_to_user((void *) arg, &vparams, sizeof(vparams)))
680 return -EFAULT;
681 return 0;
682 }
683
684 case CHIOPOSITION:
685 {
686 struct changer_position pos;
687
688 if (copy_from_user(&pos, (void*)arg, sizeof (pos)))
689 return -EFAULT;
690
691 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
692 dprintk("CHIOPOSITION: invalid parameter\n");
693 return -EBADSLT;
694 }
695 down(&ch->lock);
696 retval = ch_position(ch,0,
697 ch->firsts[pos.cp_type] + pos.cp_unit,
698 pos.cp_flags & CP_INVERT);
699 up(&ch->lock);
700 return retval;
701 }
702
703 case CHIOMOVE:
704 {
705 struct changer_move mv;
706
707 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
708 return -EFAULT;
709
710 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
711 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
712 dprintk("CHIOMOVE: invalid parameter\n");
713 return -EBADSLT;
714 }
715
716 down(&ch->lock);
717 retval = ch_move(ch,0,
718 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
719 ch->firsts[mv.cm_totype] + mv.cm_tounit,
720 mv.cm_flags & CM_INVERT);
721 up(&ch->lock);
722 return retval;
723 }
724
725 case CHIOEXCHANGE:
726 {
727 struct changer_exchange mv;
728
729 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
730 return -EFAULT;
731
732 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
733 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
734 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
735 dprintk("CHIOEXCHANGE: invalid parameter\n");
736 return -EBADSLT;
737 }
738
739 down(&ch->lock);
740 retval = ch_exchange
741 (ch,0,
742 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
743 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
744 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
745 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
746 up(&ch->lock);
747 return retval;
748 }
749
750 case CHIOGSTATUS:
751 {
752 struct changer_element_status ces;
753
754 if (copy_from_user(&ces, (void*)arg, sizeof (ces)))
755 return -EFAULT;
756 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
757 return -EINVAL;
758
759 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
760 }
761
762 case CHIOGELEM:
763 {
764 struct changer_get_element cge;
765 u_char cmd[12];
766 u_char *buffer;
767 unsigned int elem;
768 int result,i;
769
770 if (copy_from_user(&cge, (void*)arg, sizeof (cge)))
771 return -EFAULT;
772
773 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
774 return -EINVAL;
775 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
776
777 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
778 if (!buffer)
779 return -ENOMEM;
780 down(&ch->lock);
781
782 voltag_retry:
783 memset(cmd,0,sizeof(cmd));
784 cmd[0] = READ_ELEMENT_STATUS;
785 cmd[1] = (ch->device->lun << 5) |
786 (ch->voltags ? 0x10 : 0) |
787 ch_elem_to_typecode(ch,elem);
788 cmd[2] = (elem >> 8) & 0xff;
789 cmd[3] = elem & 0xff;
790 cmd[5] = 1;
791 cmd[9] = 255;
792
793 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
794 cge.cge_status = buffer[18];
795 cge.cge_flags = 0;
796 if (buffer[18] & CESTATUS_EXCEPT) {
797 cge.cge_errno = EIO;
798 }
799 if (buffer[25] & 0x80) {
800 cge.cge_flags |= CGE_SRC;
801 if (buffer[25] & 0x40)
802 cge.cge_flags |= CGE_INVERT;
803 elem = (buffer[26]<<8) | buffer[27];
804 for (i = 0; i < 4; i++) {
805 if (elem >= ch->firsts[i] &&
806 elem < ch->firsts[i] + ch->counts[i]) {
807 cge.cge_srctype = i;
808 cge.cge_srcunit = elem-ch->firsts[i];
809 }
810 }
811 }
812 if ((buffer[22] & 0x30) == 0x30) {
813 cge.cge_flags |= CGE_IDLUN;
814 cge.cge_id = buffer[23];
815 cge.cge_lun = buffer[22] & 7;
816 }
817 if (buffer[9] & 0x80) {
818 cge.cge_flags |= CGE_PVOLTAG;
819 memcpy(cge.cge_pvoltag,buffer+28,36);
820 }
821 if (buffer[9] & 0x40) {
822 cge.cge_flags |= CGE_AVOLTAG;
823 memcpy(cge.cge_avoltag,buffer+64,36);
824 }
825 } else if (ch->voltags) {
826 ch->voltags = 0;
827 vprintk("device has no volume tag support\n");
828 goto voltag_retry;
829 }
830 kfree(buffer);
831 up(&ch->lock);
832
833 if (copy_to_user((void*)arg, &cge, sizeof (cge)))
834 return -EFAULT;
835 return result;
836 }
837
838 case CHIOINITELEM:
839 {
840 down(&ch->lock);
841 retval = ch_init_elem(ch);
842 up(&ch->lock);
843 return retval;
844 }
845
846 case CHIOSVOLTAG:
847 {
848 struct changer_set_voltag csv;
849 int elem;
850
851 if (copy_from_user(&csv, (void*)arg, sizeof(csv)))
852 return -EFAULT;
853
854 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
855 dprintk("CHIOSVOLTAG: invalid parameter\n");
856 return -EBADSLT;
857 }
858 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
859 down(&ch->lock);
860 retval = ch_set_voltag(ch, elem,
861 csv.csv_flags & CSV_AVOLTAG,
862 csv.csv_flags & CSV_CLEARTAG,
863 csv.csv_voltag);
864 up(&ch->lock);
865 return retval;
866 }
867
868 default:
869 return scsi_ioctl(ch->device, cmd, (void*)arg);
870
871 }
872}
873
874#ifdef CONFIG_COMPAT
875
876struct changer_element_status32 {
877 int ces_type;
878 compat_uptr_t ces_data;
879};
880#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
881
882static long ch_ioctl_compat(struct file * file,
883 unsigned int cmd, unsigned long arg)
884{
885 scsi_changer *ch = file->private_data;
886
887 switch (cmd) {
888 case CHIOGPARAMS:
889 case CHIOGVPARAMS:
890 case CHIOPOSITION:
891 case CHIOMOVE:
892 case CHIOEXCHANGE:
893 case CHIOGELEM:
894 case CHIOINITELEM:
895 case CHIOSVOLTAG:
896 /* compatible */
897 return ch_ioctl(NULL /* inode, unused */,
898 file, cmd, arg);
899 case CHIOGSTATUS32:
900 {
901 struct changer_element_status32 ces32;
902 unsigned char *data;
903
904 if (copy_from_user(&ces32, (void*)arg, sizeof (ces32)))
905 return -EFAULT;
906 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
907 return -EINVAL;
908
909 data = compat_ptr(ces32.ces_data);
910 return ch_gstatus(ch, ces32.ces_type, data);
911 }
912 default:
913 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
914 return -ENOIOCTLCMD;
915
916 }
917}
918#endif
919
920/* ------------------------------------------------------------------------ */
921
922static int ch_probe(struct device *dev)
923{
924 struct scsi_device *sd = to_scsi_device(dev);
925 scsi_changer *ch;
926
927 if (sd->type != TYPE_MEDIUM_CHANGER)
928 return -ENODEV;
929
930 ch = kmalloc(sizeof(*ch), GFP_KERNEL);
931 if (NULL == ch)
932 return -ENOMEM;
933
934 memset(ch,0,sizeof(*ch));
935 ch->minor = ch_devcount;
936 sprintf(ch->name,"ch%d",ch->minor);
937 init_MUTEX(&ch->lock);
938 ch->device = sd;
939 ch_readconfig(ch);
940 if (init)
941 ch_init_elem(ch);
942
943 devfs_mk_cdev(MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
944 S_IFCHR | S_IRUGO | S_IWUGO, ch->name);
945 class_simple_device_add(ch_sysfs_class,
946 MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
947 dev, "s%s", ch->name);
948
949 printk(KERN_INFO "Attached scsi changer %s "
950 "at scsi%d, channel %d, id %d, lun %d\n",
951 ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun);
952
953 spin_lock(&ch_devlist_lock);
954 list_add_tail(&ch->list,&ch_devlist);
955 ch_devcount++;
956 spin_unlock(&ch_devlist_lock);
957 return 0;
958}
959
960static int ch_remove(struct device *dev)
961{
962 struct scsi_device *sd = to_scsi_device(dev);
963 scsi_changer *tmp, *ch;
964
965 spin_lock(&ch_devlist_lock);
966 ch = NULL;
967 list_for_each_entry(tmp,&ch_devlist,list) {
968 if (tmp->device == sd)
969 ch = tmp;
970 }
971 BUG_ON(NULL == ch);
972 list_del(&ch->list);
973 spin_unlock(&ch_devlist_lock);
974
975 class_simple_device_remove(MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
976 devfs_remove(ch->name);
977 kfree(ch->dt);
978 kfree(ch);
979 ch_devcount--;
980 return 0;
981}
982
983static int __init init_ch_module(void)
984{
985 int rc;
986
987 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
988 ch_sysfs_class = class_simple_create(THIS_MODULE, "scsi_changer");
989 if (IS_ERR(ch_sysfs_class)) {
990 rc = PTR_ERR(ch_sysfs_class);
991 return rc;
992 }
993 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
994 if (rc < 0) {
995 printk("Unable to get major %d for SCSI-Changer\n",
996 SCSI_CHANGER_MAJOR);
997 goto fail1;
998 }
999 rc = scsi_register_driver(&ch_template.gendrv);
1000 if (rc < 0)
1001 goto fail2;
1002 return 0;
1003
1004 fail2:
1005 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1006 fail1:
1007 class_simple_destroy(ch_sysfs_class);
1008 return rc;
1009}
1010
1011static void __exit exit_ch_module(void)
1012{
1013 scsi_unregister_driver(&ch_template.gendrv);
1014 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1015 class_simple_destroy(ch_sysfs_class);
1016}
1017
1018module_init(init_ch_module);
1019module_exit(exit_ch_module);
1020
1021/*
1022 * Local variables:
1023 * c-basic-offset: 8
1024 * End:
1025 */
Linux kernel - Deliverables
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