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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
[deliverable/linux.git] / drivers / scsi / ch.c
1 /*
2 * SCSI Media Changer device driver for Linux 2.6
3 *
4 * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
5 *
6 */
7
8 #define VERSION "0.25"
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/fs.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/major.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/interrupt.h>
19 #include <linux/blkdev.h>
20 #include <linux/completion.h>
21 #include <linux/compat.h>
22 #include <linux/chio.h> /* here are all the ioctls */
23 #include <linux/mutex.h>
24 #include <linux/idr.h>
25 #include <linux/slab.h>
26
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_cmnd.h>
29 #include <scsi/scsi_driver.h>
30 #include <scsi/scsi_ioctl.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_dbg.h>
35
36 #define CH_DT_MAX 16
37 #define CH_TYPES 8
38 #define CH_MAX_DEVS 128
39
40 MODULE_DESCRIPTION("device driver for scsi media changer devices");
41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42 MODULE_LICENSE("GPL");
43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
45
46 static DEFINE_MUTEX(ch_mutex);
47 static int init = 1;
48 module_param(init, int, 0444);
49 MODULE_PARM_DESC(init, \
50 "initialize element status on driver load (default: on)");
51
52 static int timeout_move = 300;
53 module_param(timeout_move, int, 0644);
54 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55 "(default: 300 seconds)");
56
57 static int timeout_init = 3600;
58 module_param(timeout_init, int, 0644);
59 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60 "(default: 3600 seconds)");
61
62 static int verbose = 1;
63 module_param(verbose, int, 0644);
64 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66 static int debug = 0;
67 module_param(debug, int, 0644);
68 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69 "detailed sense codes on scsi errors (default: off)");
70
71 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72 static int dt_lun[CH_DT_MAX];
73 module_param_array(dt_id, int, NULL, 0444);
74 module_param_array(dt_lun, int, NULL, 0444);
75
76 /* tell the driver about vendor-specific slots */
77 static int vendor_firsts[CH_TYPES-4];
78 static int vendor_counts[CH_TYPES-4];
79 module_param_array(vendor_firsts, int, NULL, 0444);
80 module_param_array(vendor_counts, int, NULL, 0444);
81
82 static const char * vendor_labels[CH_TYPES-4] = {
83 "v0", "v1", "v2", "v3"
84 };
85 // module_param_string_array(vendor_labels, NULL, 0444);
86
87 #define ch_printk(prefix, ch, fmt, a...) \
88 sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
89
90 #define DPRINTK(fmt, arg...) \
91 do { \
92 if (debug) \
93 ch_printk(KERN_DEBUG, ch, fmt, ##arg); \
94 } while (0)
95 #define VPRINTK(level, fmt, arg...) \
96 do { \
97 if (verbose) \
98 ch_printk(level, ch, fmt, ##arg); \
99 } while (0)
100
101 /* ------------------------------------------------------------------- */
102
103 #define MAX_RETRIES 1
104
105 static struct class * ch_sysfs_class;
106
107 typedef struct {
108 struct list_head list;
109 int minor;
110 char name[8];
111 struct scsi_device *device;
112 struct scsi_device **dt; /* ptrs to data transfer elements */
113 u_int firsts[CH_TYPES];
114 u_int counts[CH_TYPES];
115 u_int unit_attention;
116 u_int voltags;
117 struct mutex lock;
118 } scsi_changer;
119
120 static DEFINE_IDR(ch_index_idr);
121 static DEFINE_SPINLOCK(ch_index_lock);
122
123 static const struct {
124 unsigned char sense;
125 unsigned char asc;
126 unsigned char ascq;
127 int errno;
128 } ch_err[] = {
129 /* Just filled in what looks right. Hav'nt checked any standard paper for
130 these errno assignments, so they may be wrong... */
131 {
132 .sense = ILLEGAL_REQUEST,
133 .asc = 0x21,
134 .ascq = 0x01,
135 .errno = EBADSLT, /* Invalid element address */
136 },{
137 .sense = ILLEGAL_REQUEST,
138 .asc = 0x28,
139 .ascq = 0x01,
140 .errno = EBADE, /* Import or export element accessed */
141 },{
142 .sense = ILLEGAL_REQUEST,
143 .asc = 0x3B,
144 .ascq = 0x0D,
145 .errno = EXFULL, /* Medium destination element full */
146 },{
147 .sense = ILLEGAL_REQUEST,
148 .asc = 0x3B,
149 .ascq = 0x0E,
150 .errno = EBADE, /* Medium source element empty */
151 },{
152 .sense = ILLEGAL_REQUEST,
153 .asc = 0x20,
154 .ascq = 0x00,
155 .errno = EBADRQC, /* Invalid command operation code */
156 },{
157 /* end of list */
158 }
159 };
160
161 /* ------------------------------------------------------------------- */
162
163 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
164 {
165 int i,errno = 0;
166
167 /* Check to see if additional sense information is available */
168 if (scsi_sense_valid(sshdr) &&
169 sshdr->asc != 0) {
170 for (i = 0; ch_err[i].errno != 0; i++) {
171 if (ch_err[i].sense == sshdr->sense_key &&
172 ch_err[i].asc == sshdr->asc &&
173 ch_err[i].ascq == sshdr->ascq) {
174 errno = -ch_err[i].errno;
175 break;
176 }
177 }
178 }
179 if (errno == 0)
180 errno = -EIO;
181 return errno;
182 }
183
184 static int
185 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
186 void *buffer, unsigned buflength,
187 enum dma_data_direction direction)
188 {
189 int errno, retries = 0, timeout, result;
190 struct scsi_sense_hdr sshdr;
191
192 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
193 ? timeout_init : timeout_move;
194
195 retry:
196 errno = 0;
197 if (debug) {
198 DPRINTK("command: ");
199 __scsi_print_command(cmd, cmd_len);
200 }
201
202 result = scsi_execute_req(ch->device, cmd, direction, buffer,
203 buflength, &sshdr, timeout * HZ,
204 MAX_RETRIES, NULL);
205
206 DPRINTK("result: 0x%x\n",result);
207 if (driver_byte(result) & DRIVER_SENSE) {
208 if (debug)
209 scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
210 errno = ch_find_errno(&sshdr);
211
212 switch(sshdr.sense_key) {
213 case UNIT_ATTENTION:
214 ch->unit_attention = 1;
215 if (retries++ < 3)
216 goto retry;
217 break;
218 }
219 }
220 return errno;
221 }
222
223 /* ------------------------------------------------------------------------ */
224
225 static int
226 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
227 {
228 int i;
229
230 for (i = 0; i < CH_TYPES; i++) {
231 if (elem >= ch->firsts[i] &&
232 elem < ch->firsts[i] +
233 ch->counts[i])
234 return i+1;
235 }
236 return 0;
237 }
238
239 static int
240 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
241 {
242 u_char cmd[12];
243 u_char *buffer;
244 int result;
245
246 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
247 if(!buffer)
248 return -ENOMEM;
249
250 retry:
251 memset(cmd,0,sizeof(cmd));
252 cmd[0] = READ_ELEMENT_STATUS;
253 cmd[1] = ((ch->device->lun & 0x7) << 5) |
254 (ch->voltags ? 0x10 : 0) |
255 ch_elem_to_typecode(ch,elem);
256 cmd[2] = (elem >> 8) & 0xff;
257 cmd[3] = elem & 0xff;
258 cmd[5] = 1;
259 cmd[9] = 255;
260 if (0 == (result = ch_do_scsi(ch, cmd, 12,
261 buffer, 256, DMA_FROM_DEVICE))) {
262 if (((buffer[16] << 8) | buffer[17]) != elem) {
263 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
264 elem,(buffer[16] << 8) | buffer[17]);
265 kfree(buffer);
266 return -EIO;
267 }
268 memcpy(data,buffer+16,16);
269 } else {
270 if (ch->voltags) {
271 ch->voltags = 0;
272 VPRINTK(KERN_INFO, "device has no volume tag support\n");
273 goto retry;
274 }
275 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
276 }
277 kfree(buffer);
278 return result;
279 }
280
281 static int
282 ch_init_elem(scsi_changer *ch)
283 {
284 int err;
285 u_char cmd[6];
286
287 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
288 memset(cmd,0,sizeof(cmd));
289 cmd[0] = INITIALIZE_ELEMENT_STATUS;
290 cmd[1] = (ch->device->lun & 0x7) << 5;
291 err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
292 VPRINTK(KERN_INFO, "... finished\n");
293 return err;
294 }
295
296 static int
297 ch_readconfig(scsi_changer *ch)
298 {
299 u_char cmd[10], data[16];
300 u_char *buffer;
301 int result,id,lun,i;
302 u_int elem;
303
304 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
305 if (!buffer)
306 return -ENOMEM;
307
308 memset(cmd,0,sizeof(cmd));
309 cmd[0] = MODE_SENSE;
310 cmd[1] = (ch->device->lun & 0x7) << 5;
311 cmd[2] = 0x1d;
312 cmd[4] = 255;
313 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
314 if (0 != result) {
315 cmd[1] |= (1<<3);
316 result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
317 }
318 if (0 == result) {
319 ch->firsts[CHET_MT] =
320 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
321 ch->counts[CHET_MT] =
322 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
323 ch->firsts[CHET_ST] =
324 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
325 ch->counts[CHET_ST] =
326 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
327 ch->firsts[CHET_IE] =
328 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
329 ch->counts[CHET_IE] =
330 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
331 ch->firsts[CHET_DT] =
332 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
333 ch->counts[CHET_DT] =
334 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
335 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
336 ch->firsts[CHET_MT],
337 ch->counts[CHET_MT]);
338 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
339 ch->firsts[CHET_ST],
340 ch->counts[CHET_ST]);
341 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
342 ch->firsts[CHET_IE],
343 ch->counts[CHET_IE]);
344 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
345 ch->firsts[CHET_DT],
346 ch->counts[CHET_DT]);
347 } else {
348 VPRINTK(KERN_INFO, "reading element address assigment page failed!\n");
349 }
350
351 /* vendor specific element types */
352 for (i = 0; i < 4; i++) {
353 if (0 == vendor_counts[i])
354 continue;
355 if (NULL == vendor_labels[i])
356 continue;
357 ch->firsts[CHET_V1+i] = vendor_firsts[i];
358 ch->counts[CHET_V1+i] = vendor_counts[i];
359 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
360 i+5,i+1,vendor_firsts[i],vendor_counts[i],
361 vendor_labels[i]);
362 }
363
364 /* look up the devices of the data transfer elements */
365 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
366 GFP_KERNEL);
367
368 if (!ch->dt) {
369 kfree(buffer);
370 return -ENOMEM;
371 }
372
373 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
374 id = -1;
375 lun = 0;
376 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
377 id = dt_id[elem];
378 lun = dt_lun[elem];
379 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
380 elem+ch->firsts[CHET_DT]);
381 } else if (0 != ch_read_element_status
382 (ch,elem+ch->firsts[CHET_DT],data)) {
383 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
384 elem+ch->firsts[CHET_DT]);
385 } else {
386 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
387 if (data[6] & 0x80) {
388 VPRINTK(KERN_CONT, "not this SCSI bus\n");
389 ch->dt[elem] = NULL;
390 } else if (0 == (data[6] & 0x30)) {
391 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
392 ch->dt[elem] = NULL;
393 } else {
394 id = ch->device->id;
395 lun = 0;
396 if (data[6] & 0x20) id = data[7];
397 if (data[6] & 0x10) lun = data[6] & 7;
398 }
399 }
400 if (-1 != id) {
401 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
402 ch->dt[elem] =
403 scsi_device_lookup(ch->device->host,
404 ch->device->channel,
405 id,lun);
406 if (!ch->dt[elem]) {
407 /* should not happen */
408 VPRINTK(KERN_CONT, "Huh? device not found!\n");
409 } else {
410 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
411 ch->dt[elem]->vendor,
412 ch->dt[elem]->model,
413 ch->dt[elem]->rev);
414 }
415 }
416 }
417 ch->voltags = 1;
418 kfree(buffer);
419
420 return 0;
421 }
422
423 /* ------------------------------------------------------------------------ */
424
425 static int
426 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
427 {
428 u_char cmd[10];
429
430 DPRINTK("position: 0x%x\n",elem);
431 if (0 == trans)
432 trans = ch->firsts[CHET_MT];
433 memset(cmd,0,sizeof(cmd));
434 cmd[0] = POSITION_TO_ELEMENT;
435 cmd[1] = (ch->device->lun & 0x7) << 5;
436 cmd[2] = (trans >> 8) & 0xff;
437 cmd[3] = trans & 0xff;
438 cmd[4] = (elem >> 8) & 0xff;
439 cmd[5] = elem & 0xff;
440 cmd[8] = rotate ? 1 : 0;
441 return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
442 }
443
444 static int
445 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
446 {
447 u_char cmd[12];
448
449 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
450 if (0 == trans)
451 trans = ch->firsts[CHET_MT];
452 memset(cmd,0,sizeof(cmd));
453 cmd[0] = MOVE_MEDIUM;
454 cmd[1] = (ch->device->lun & 0x7) << 5;
455 cmd[2] = (trans >> 8) & 0xff;
456 cmd[3] = trans & 0xff;
457 cmd[4] = (src >> 8) & 0xff;
458 cmd[5] = src & 0xff;
459 cmd[6] = (dest >> 8) & 0xff;
460 cmd[7] = dest & 0xff;
461 cmd[10] = rotate ? 1 : 0;
462 return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
463 }
464
465 static int
466 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
467 u_int dest1, u_int dest2, int rotate1, int rotate2)
468 {
469 u_char cmd[12];
470
471 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
472 src,dest1,dest2);
473 if (0 == trans)
474 trans = ch->firsts[CHET_MT];
475 memset(cmd,0,sizeof(cmd));
476 cmd[0] = EXCHANGE_MEDIUM;
477 cmd[1] = (ch->device->lun & 0x7) << 5;
478 cmd[2] = (trans >> 8) & 0xff;
479 cmd[3] = trans & 0xff;
480 cmd[4] = (src >> 8) & 0xff;
481 cmd[5] = src & 0xff;
482 cmd[6] = (dest1 >> 8) & 0xff;
483 cmd[7] = dest1 & 0xff;
484 cmd[8] = (dest2 >> 8) & 0xff;
485 cmd[9] = dest2 & 0xff;
486 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
487
488 return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
489 }
490
491 static void
492 ch_check_voltag(char *tag)
493 {
494 int i;
495
496 for (i = 0; i < 32; i++) {
497 /* restrict to ascii */
498 if (tag[i] >= 0x7f || tag[i] < 0x20)
499 tag[i] = ' ';
500 /* don't allow search wildcards */
501 if (tag[i] == '?' ||
502 tag[i] == '*')
503 tag[i] = ' ';
504 }
505 }
506
507 static int
508 ch_set_voltag(scsi_changer *ch, u_int elem,
509 int alternate, int clear, u_char *tag)
510 {
511 u_char cmd[12];
512 u_char *buffer;
513 int result;
514
515 buffer = kzalloc(512, GFP_KERNEL);
516 if (!buffer)
517 return -ENOMEM;
518
519 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
520 clear ? "clear" : "set",
521 alternate ? "alternate" : "primary",
522 elem, tag);
523 memset(cmd,0,sizeof(cmd));
524 cmd[0] = SEND_VOLUME_TAG;
525 cmd[1] = ((ch->device->lun & 0x7) << 5) |
526 ch_elem_to_typecode(ch,elem);
527 cmd[2] = (elem >> 8) & 0xff;
528 cmd[3] = elem & 0xff;
529 cmd[5] = clear
530 ? (alternate ? 0x0d : 0x0c)
531 : (alternate ? 0x0b : 0x0a);
532
533 cmd[9] = 255;
534
535 memcpy(buffer,tag,32);
536 ch_check_voltag(buffer);
537
538 result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
539 kfree(buffer);
540 return result;
541 }
542
543 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
544 {
545 int retval = 0;
546 u_char data[16];
547 unsigned int i;
548
549 mutex_lock(&ch->lock);
550 for (i = 0; i < ch->counts[type]; i++) {
551 if (0 != ch_read_element_status
552 (ch, ch->firsts[type]+i,data)) {
553 retval = -EIO;
554 break;
555 }
556 put_user(data[2], dest+i);
557 if (data[2] & CESTATUS_EXCEPT)
558 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
559 ch->firsts[type]+i,
560 (int)data[4],(int)data[5]);
561 retval = ch_read_element_status
562 (ch, ch->firsts[type]+i,data);
563 if (0 != retval)
564 break;
565 }
566 mutex_unlock(&ch->lock);
567 return retval;
568 }
569
570 /* ------------------------------------------------------------------------ */
571
572 static int
573 ch_release(struct inode *inode, struct file *file)
574 {
575 scsi_changer *ch = file->private_data;
576
577 scsi_device_put(ch->device);
578 file->private_data = NULL;
579 return 0;
580 }
581
582 static int
583 ch_open(struct inode *inode, struct file *file)
584 {
585 scsi_changer *ch;
586 int minor = iminor(inode);
587
588 mutex_lock(&ch_mutex);
589 spin_lock(&ch_index_lock);
590 ch = idr_find(&ch_index_idr, minor);
591
592 if (NULL == ch || scsi_device_get(ch->device)) {
593 spin_unlock(&ch_index_lock);
594 mutex_unlock(&ch_mutex);
595 return -ENXIO;
596 }
597 spin_unlock(&ch_index_lock);
598
599 file->private_data = ch;
600 mutex_unlock(&ch_mutex);
601 return 0;
602 }
603
604 static int
605 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
606 {
607 if (type >= CH_TYPES || unit >= ch->counts[type])
608 return -1;
609 return 0;
610 }
611
612 static long ch_ioctl(struct file *file,
613 unsigned int cmd, unsigned long arg)
614 {
615 scsi_changer *ch = file->private_data;
616 int retval;
617 void __user *argp = (void __user *)arg;
618
619 retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
620 file->f_flags & O_NDELAY);
621 if (retval)
622 return retval;
623
624 switch (cmd) {
625 case CHIOGPARAMS:
626 {
627 struct changer_params params;
628
629 params.cp_curpicker = 0;
630 params.cp_npickers = ch->counts[CHET_MT];
631 params.cp_nslots = ch->counts[CHET_ST];
632 params.cp_nportals = ch->counts[CHET_IE];
633 params.cp_ndrives = ch->counts[CHET_DT];
634
635 if (copy_to_user(argp, &params, sizeof(params)))
636 return -EFAULT;
637 return 0;
638 }
639 case CHIOGVPARAMS:
640 {
641 struct changer_vendor_params vparams;
642
643 memset(&vparams,0,sizeof(vparams));
644 if (ch->counts[CHET_V1]) {
645 vparams.cvp_n1 = ch->counts[CHET_V1];
646 strncpy(vparams.cvp_label1,vendor_labels[0],16);
647 }
648 if (ch->counts[CHET_V2]) {
649 vparams.cvp_n2 = ch->counts[CHET_V2];
650 strncpy(vparams.cvp_label2,vendor_labels[1],16);
651 }
652 if (ch->counts[CHET_V3]) {
653 vparams.cvp_n3 = ch->counts[CHET_V3];
654 strncpy(vparams.cvp_label3,vendor_labels[2],16);
655 }
656 if (ch->counts[CHET_V4]) {
657 vparams.cvp_n4 = ch->counts[CHET_V4];
658 strncpy(vparams.cvp_label4,vendor_labels[3],16);
659 }
660 if (copy_to_user(argp, &vparams, sizeof(vparams)))
661 return -EFAULT;
662 return 0;
663 }
664
665 case CHIOPOSITION:
666 {
667 struct changer_position pos;
668
669 if (copy_from_user(&pos, argp, sizeof (pos)))
670 return -EFAULT;
671
672 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
673 DPRINTK("CHIOPOSITION: invalid parameter\n");
674 return -EBADSLT;
675 }
676 mutex_lock(&ch->lock);
677 retval = ch_position(ch,0,
678 ch->firsts[pos.cp_type] + pos.cp_unit,
679 pos.cp_flags & CP_INVERT);
680 mutex_unlock(&ch->lock);
681 return retval;
682 }
683
684 case CHIOMOVE:
685 {
686 struct changer_move mv;
687
688 if (copy_from_user(&mv, argp, sizeof (mv)))
689 return -EFAULT;
690
691 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
692 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
693 DPRINTK("CHIOMOVE: invalid parameter\n");
694 return -EBADSLT;
695 }
696
697 mutex_lock(&ch->lock);
698 retval = ch_move(ch,0,
699 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
700 ch->firsts[mv.cm_totype] + mv.cm_tounit,
701 mv.cm_flags & CM_INVERT);
702 mutex_unlock(&ch->lock);
703 return retval;
704 }
705
706 case CHIOEXCHANGE:
707 {
708 struct changer_exchange mv;
709
710 if (copy_from_user(&mv, argp, sizeof (mv)))
711 return -EFAULT;
712
713 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
714 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
715 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
716 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
717 return -EBADSLT;
718 }
719
720 mutex_lock(&ch->lock);
721 retval = ch_exchange
722 (ch,0,
723 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
724 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
725 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
726 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
727 mutex_unlock(&ch->lock);
728 return retval;
729 }
730
731 case CHIOGSTATUS:
732 {
733 struct changer_element_status ces;
734
735 if (copy_from_user(&ces, argp, sizeof (ces)))
736 return -EFAULT;
737 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
738 return -EINVAL;
739
740 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
741 }
742
743 case CHIOGELEM:
744 {
745 struct changer_get_element cge;
746 u_char ch_cmd[12];
747 u_char *buffer;
748 unsigned int elem;
749 int result,i;
750
751 if (copy_from_user(&cge, argp, sizeof (cge)))
752 return -EFAULT;
753
754 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
755 return -EINVAL;
756 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
757
758 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
759 if (!buffer)
760 return -ENOMEM;
761 mutex_lock(&ch->lock);
762
763 voltag_retry:
764 memset(ch_cmd, 0, sizeof(ch_cmd));
765 ch_cmd[0] = READ_ELEMENT_STATUS;
766 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
767 (ch->voltags ? 0x10 : 0) |
768 ch_elem_to_typecode(ch,elem);
769 ch_cmd[2] = (elem >> 8) & 0xff;
770 ch_cmd[3] = elem & 0xff;
771 ch_cmd[5] = 1;
772 ch_cmd[9] = 255;
773
774 result = ch_do_scsi(ch, ch_cmd, 12,
775 buffer, 256, DMA_FROM_DEVICE);
776 if (!result) {
777 cge.cge_status = buffer[18];
778 cge.cge_flags = 0;
779 if (buffer[18] & CESTATUS_EXCEPT) {
780 cge.cge_errno = EIO;
781 }
782 if (buffer[25] & 0x80) {
783 cge.cge_flags |= CGE_SRC;
784 if (buffer[25] & 0x40)
785 cge.cge_flags |= CGE_INVERT;
786 elem = (buffer[26]<<8) | buffer[27];
787 for (i = 0; i < 4; i++) {
788 if (elem >= ch->firsts[i] &&
789 elem < ch->firsts[i] + ch->counts[i]) {
790 cge.cge_srctype = i;
791 cge.cge_srcunit = elem-ch->firsts[i];
792 }
793 }
794 }
795 if ((buffer[22] & 0x30) == 0x30) {
796 cge.cge_flags |= CGE_IDLUN;
797 cge.cge_id = buffer[23];
798 cge.cge_lun = buffer[22] & 7;
799 }
800 if (buffer[9] & 0x80) {
801 cge.cge_flags |= CGE_PVOLTAG;
802 memcpy(cge.cge_pvoltag,buffer+28,36);
803 }
804 if (buffer[9] & 0x40) {
805 cge.cge_flags |= CGE_AVOLTAG;
806 memcpy(cge.cge_avoltag,buffer+64,36);
807 }
808 } else if (ch->voltags) {
809 ch->voltags = 0;
810 VPRINTK(KERN_INFO, "device has no volume tag support\n");
811 goto voltag_retry;
812 }
813 kfree(buffer);
814 mutex_unlock(&ch->lock);
815
816 if (copy_to_user(argp, &cge, sizeof (cge)))
817 return -EFAULT;
818 return result;
819 }
820
821 case CHIOINITELEM:
822 {
823 mutex_lock(&ch->lock);
824 retval = ch_init_elem(ch);
825 mutex_unlock(&ch->lock);
826 return retval;
827 }
828
829 case CHIOSVOLTAG:
830 {
831 struct changer_set_voltag csv;
832 int elem;
833
834 if (copy_from_user(&csv, argp, sizeof(csv)))
835 return -EFAULT;
836
837 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
838 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
839 return -EBADSLT;
840 }
841 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
842 mutex_lock(&ch->lock);
843 retval = ch_set_voltag(ch, elem,
844 csv.csv_flags & CSV_AVOLTAG,
845 csv.csv_flags & CSV_CLEARTAG,
846 csv.csv_voltag);
847 mutex_unlock(&ch->lock);
848 return retval;
849 }
850
851 default:
852 return scsi_ioctl(ch->device, cmd, argp);
853
854 }
855 }
856
857 #ifdef CONFIG_COMPAT
858
859 struct changer_element_status32 {
860 int ces_type;
861 compat_uptr_t ces_data;
862 };
863 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
864
865 static long ch_ioctl_compat(struct file * file,
866 unsigned int cmd, unsigned long arg)
867 {
868 scsi_changer *ch = file->private_data;
869
870 switch (cmd) {
871 case CHIOGPARAMS:
872 case CHIOGVPARAMS:
873 case CHIOPOSITION:
874 case CHIOMOVE:
875 case CHIOEXCHANGE:
876 case CHIOGELEM:
877 case CHIOINITELEM:
878 case CHIOSVOLTAG:
879 /* compatible */
880 return ch_ioctl(file, cmd, arg);
881 case CHIOGSTATUS32:
882 {
883 struct changer_element_status32 ces32;
884 unsigned char __user *data;
885
886 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
887 return -EFAULT;
888 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
889 return -EINVAL;
890
891 data = compat_ptr(ces32.ces_data);
892 return ch_gstatus(ch, ces32.ces_type, data);
893 }
894 default:
895 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
896 return -ENOIOCTLCMD;
897
898 }
899 }
900 #endif
901
902 /* ------------------------------------------------------------------------ */
903
904 static int ch_probe(struct device *dev)
905 {
906 struct scsi_device *sd = to_scsi_device(dev);
907 struct device *class_dev;
908 int ret;
909 scsi_changer *ch;
910
911 if (sd->type != TYPE_MEDIUM_CHANGER)
912 return -ENODEV;
913
914 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
915 if (NULL == ch)
916 return -ENOMEM;
917
918 idr_preload(GFP_KERNEL);
919 spin_lock(&ch_index_lock);
920 ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
921 spin_unlock(&ch_index_lock);
922 idr_preload_end();
923
924 if (ret < 0) {
925 if (ret == -ENOSPC)
926 ret = -ENODEV;
927 goto free_ch;
928 }
929
930 ch->minor = ret;
931 sprintf(ch->name,"ch%d",ch->minor);
932
933 class_dev = device_create(ch_sysfs_class, dev,
934 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
935 "s%s", ch->name);
936 if (IS_ERR(class_dev)) {
937 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
938 ch->minor);
939 ret = PTR_ERR(class_dev);
940 goto remove_idr;
941 }
942
943 mutex_init(&ch->lock);
944 ch->device = sd;
945 ch_readconfig(ch);
946 if (init)
947 ch_init_elem(ch);
948
949 dev_set_drvdata(dev, ch);
950 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
951
952 return 0;
953 remove_idr:
954 idr_remove(&ch_index_idr, ch->minor);
955 free_ch:
956 kfree(ch);
957 return ret;
958 }
959
960 static int ch_remove(struct device *dev)
961 {
962 scsi_changer *ch = dev_get_drvdata(dev);
963
964 spin_lock(&ch_index_lock);
965 idr_remove(&ch_index_idr, ch->minor);
966 spin_unlock(&ch_index_lock);
967
968 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
969 kfree(ch->dt);
970 kfree(ch);
971 return 0;
972 }
973
974 static struct scsi_driver ch_template = {
975 .gendrv = {
976 .name = "ch",
977 .owner = THIS_MODULE,
978 .probe = ch_probe,
979 .remove = ch_remove,
980 },
981 };
982
983 static const struct file_operations changer_fops = {
984 .owner = THIS_MODULE,
985 .open = ch_open,
986 .release = ch_release,
987 .unlocked_ioctl = ch_ioctl,
988 #ifdef CONFIG_COMPAT
989 .compat_ioctl = ch_ioctl_compat,
990 #endif
991 .llseek = noop_llseek,
992 };
993
994 static int __init init_ch_module(void)
995 {
996 int rc;
997
998 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
999 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1000 if (IS_ERR(ch_sysfs_class)) {
1001 rc = PTR_ERR(ch_sysfs_class);
1002 return rc;
1003 }
1004 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1005 if (rc < 0) {
1006 printk("Unable to get major %d for SCSI-Changer\n",
1007 SCSI_CHANGER_MAJOR);
1008 goto fail1;
1009 }
1010 rc = scsi_register_driver(&ch_template.gendrv);
1011 if (rc < 0)
1012 goto fail2;
1013 return 0;
1014
1015 fail2:
1016 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1017 fail1:
1018 class_destroy(ch_sysfs_class);
1019 return rc;
1020 }
1021
1022 static void __exit exit_ch_module(void)
1023 {
1024 scsi_unregister_driver(&ch_template.gendrv);
1025 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1026 class_destroy(ch_sysfs_class);
1027 idr_destroy(&ch_index_idr);
1028 }
1029
1030 module_init(init_ch_module);
1031 module_exit(exit_ch_module);
1032
1033 /*
1034 * Local variables:
1035 * c-basic-offset: 8
1036 * End:
1037 */
Linux kernel - Deliverables
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