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Btrfs: Clear the device->running_pending flag before bailing on congestion
[linux-2.6/linux-loongson.git] / drivers / scsi / ch.c
blob88ecf94ad979f92d737fb24adb25ef0fe2a58125
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/smp_lock.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
45 static int init = 1;
46 module_param(init, int, 0444);
47 MODULE_PARM_DESC(init, \
48 "initialize element status on driver load (default: on)");
49
50 static int timeout_move = 300;
51 module_param(timeout_move, int, 0644);
52 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
53 "(default: 300 seconds)");
54
55 static int timeout_init = 3600;
56 module_param(timeout_init, int, 0644);
57 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
58 "(default: 3600 seconds)");
59
60 static int verbose = 1;
61 module_param(verbose, int, 0644);
62 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
63
64 static int debug = 0;
65 module_param(debug, int, 0644);
66 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
67 "detailed sense codes on scsi errors (default: off)");
68
69 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
70 static int dt_lun[CH_DT_MAX];
71 module_param_array(dt_id, int, NULL, 0444);
72 module_param_array(dt_lun, int, NULL, 0444);
73
74 /* tell the driver about vendor-specific slots */
75 static int vendor_firsts[CH_TYPES-4];
76 static int vendor_counts[CH_TYPES-4];
77 module_param_array(vendor_firsts, int, NULL, 0444);
78 module_param_array(vendor_counts, int, NULL, 0444);
79
80 static const char * vendor_labels[CH_TYPES-4] = {
81 "v0", "v1", "v2", "v3"
82 };
83 // module_param_string_array(vendor_labels, NULL, 0444);
84
85 #define dprintk(fmt, arg...) if (debug) \
86 printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
87 #define vprintk(fmt, arg...) if (verbose) \
88 printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
89
90 /* ------------------------------------------------------------------- */
91
92 #define MAX_RETRIES 1
93
94 static struct class * ch_sysfs_class;
95
96 typedef struct {
97 struct list_head list;
98 int minor;
99 char name[8];
100 struct scsi_device *device;
101 struct scsi_device **dt; /* ptrs to data transfer elements */
102 u_int firsts[CH_TYPES];
103 u_int counts[CH_TYPES];
104 u_int unit_attention;
105 u_int voltags;
106 struct mutex lock;
107 } scsi_changer;
108
109 static DEFINE_IDR(ch_index_idr);
110 static DEFINE_SPINLOCK(ch_index_lock);
111
112 static const struct {
113 unsigned char sense;
114 unsigned char asc;
115 unsigned char ascq;
116 int errno;
117 } ch_err[] = {
118 /* Just filled in what looks right. Hav'nt checked any standard paper for
119 these errno assignments, so they may be wrong... */
120 {
121 .sense = ILLEGAL_REQUEST,
122 .asc = 0x21,
123 .ascq = 0x01,
124 .errno = EBADSLT, /* Invalid element address */
125 },{
126 .sense = ILLEGAL_REQUEST,
127 .asc = 0x28,
128 .ascq = 0x01,
129 .errno = EBADE, /* Import or export element accessed */
130 },{
131 .sense = ILLEGAL_REQUEST,
132 .asc = 0x3B,
133 .ascq = 0x0D,
134 .errno = EXFULL, /* Medium destination element full */
135 },{
136 .sense = ILLEGAL_REQUEST,
137 .asc = 0x3B,
138 .ascq = 0x0E,
139 .errno = EBADE, /* Medium source element empty */
140 },{
141 .sense = ILLEGAL_REQUEST,
142 .asc = 0x20,
143 .ascq = 0x00,
144 .errno = EBADRQC, /* Invalid command operation code */
145 },{
146 /* end of list */
147 }
148 };
149
150 /* ------------------------------------------------------------------- */
151
152 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
153 {
154 int i,errno = 0;
155
156 /* Check to see if additional sense information is available */
157 if (scsi_sense_valid(sshdr) &&
158 sshdr->asc != 0) {
159 for (i = 0; ch_err[i].errno != 0; i++) {
160 if (ch_err[i].sense == sshdr->sense_key &&
161 ch_err[i].asc == sshdr->asc &&
162 ch_err[i].ascq == sshdr->ascq) {
163 errno = -ch_err[i].errno;
164 break;
165 }
166 }
167 }
168 if (errno == 0)
169 errno = -EIO;
170 return errno;
171 }
172
173 static int
174 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
175 void *buffer, unsigned buflength,
176 enum dma_data_direction direction)
177 {
178 int errno, retries = 0, timeout, result;
179 struct scsi_sense_hdr sshdr;
180
181 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
182 ? timeout_init : timeout_move;
183
184 retry:
185 errno = 0;
186 if (debug) {
187 dprintk("command: ");
188 __scsi_print_command(cmd);
189 }
190
191 result = scsi_execute_req(ch->device, cmd, direction, buffer,
192 buflength, &sshdr, timeout * HZ,
193 MAX_RETRIES);
194
195 dprintk("result: 0x%x\n",result);
196 if (driver_byte(result) & DRIVER_SENSE) {
197 if (debug)
198 scsi_print_sense_hdr(ch->name, &sshdr);
199 errno = ch_find_errno(&sshdr);
200
201 switch(sshdr.sense_key) {
202 case UNIT_ATTENTION:
203 ch->unit_attention = 1;
204 if (retries++ < 3)
205 goto retry;
206 break;
207 }
208 }
209 return errno;
210 }
211
212 /* ------------------------------------------------------------------------ */
213
214 static int
215 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
216 {
217 int i;
218
219 for (i = 0; i < CH_TYPES; i++) {
220 if (elem >= ch->firsts[i] &&
221 elem < ch->firsts[i] +
222 ch->counts[i])
223 return i+1;
224 }
225 return 0;
226 }
227
228 static int
229 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
230 {
231 u_char cmd[12];
232 u_char *buffer;
233 int result;
234
235 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
236 if(!buffer)
237 return -ENOMEM;
238
239 retry:
240 memset(cmd,0,sizeof(cmd));
241 cmd[0] = READ_ELEMENT_STATUS;
242 cmd[1] = (ch->device->lun << 5) |
243 (ch->voltags ? 0x10 : 0) |
244 ch_elem_to_typecode(ch,elem);
245 cmd[2] = (elem >> 8) & 0xff;
246 cmd[3] = elem & 0xff;
247 cmd[5] = 1;
248 cmd[9] = 255;
249 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
250 if (((buffer[16] << 8) | buffer[17]) != elem) {
251 dprintk("asked for element 0x%02x, got 0x%02x\n",
252 elem,(buffer[16] << 8) | buffer[17]);
253 kfree(buffer);
254 return -EIO;
255 }
256 memcpy(data,buffer+16,16);
257 } else {
258 if (ch->voltags) {
259 ch->voltags = 0;
260 vprintk("device has no volume tag support\n");
261 goto retry;
262 }
263 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
264 }
265 kfree(buffer);
266 return result;
267 }
268
269 static int
270 ch_init_elem(scsi_changer *ch)
271 {
272 int err;
273 u_char cmd[6];
274
275 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
276 memset(cmd,0,sizeof(cmd));
277 cmd[0] = INITIALIZE_ELEMENT_STATUS;
278 cmd[1] = ch->device->lun << 5;
279 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
280 vprintk("... finished\n");
281 return err;
282 }
283
284 static int
285 ch_readconfig(scsi_changer *ch)
286 {
287 u_char cmd[10], data[16];
288 u_char *buffer;
289 int result,id,lun,i;
290 u_int elem;
291
292 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
293 if (!buffer)
294 return -ENOMEM;
295
296 memset(cmd,0,sizeof(cmd));
297 cmd[0] = MODE_SENSE;
298 cmd[1] = ch->device->lun << 5;
299 cmd[2] = 0x1d;
300 cmd[4] = 255;
301 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
302 if (0 != result) {
303 cmd[1] |= (1<<3);
304 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
305 }
306 if (0 == result) {
307 ch->firsts[CHET_MT] =
308 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
309 ch->counts[CHET_MT] =
310 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
311 ch->firsts[CHET_ST] =
312 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
313 ch->counts[CHET_ST] =
314 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
315 ch->firsts[CHET_IE] =
316 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
317 ch->counts[CHET_IE] =
318 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
319 ch->firsts[CHET_DT] =
320 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
321 ch->counts[CHET_DT] =
322 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
323 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
324 ch->firsts[CHET_MT],
325 ch->counts[CHET_MT]);
326 vprintk("type #2 (st): 0x%x+%d [storage]\n",
327 ch->firsts[CHET_ST],
328 ch->counts[CHET_ST]);
329 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
330 ch->firsts[CHET_IE],
331 ch->counts[CHET_IE]);
332 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
333 ch->firsts[CHET_DT],
334 ch->counts[CHET_DT]);
335 } else {
336 vprintk("reading element address assigment page failed!\n");
337 }
338
339 /* vendor specific element types */
340 for (i = 0; i < 4; i++) {
341 if (0 == vendor_counts[i])
342 continue;
343 if (NULL == vendor_labels[i])
344 continue;
345 ch->firsts[CHET_V1+i] = vendor_firsts[i];
346 ch->counts[CHET_V1+i] = vendor_counts[i];
347 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
348 i+5,i+1,vendor_firsts[i],vendor_counts[i],
349 vendor_labels[i]);
350 }
351
352 /* look up the devices of the data transfer elements */
353 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
354 GFP_KERNEL);
355 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
356 id = -1;
357 lun = 0;
358 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
359 id = dt_id[elem];
360 lun = dt_lun[elem];
361 vprintk("dt 0x%x: [insmod option] ",
362 elem+ch->firsts[CHET_DT]);
363 } else if (0 != ch_read_element_status
364 (ch,elem+ch->firsts[CHET_DT],data)) {
365 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
366 elem+ch->firsts[CHET_DT]);
367 } else {
368 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
369 if (data[6] & 0x80) {
370 if (verbose)
371 printk("not this SCSI bus\n");
372 ch->dt[elem] = NULL;
373 } else if (0 == (data[6] & 0x30)) {
374 if (verbose)
375 printk("ID/LUN unknown\n");
376 ch->dt[elem] = NULL;
377 } else {
378 id = ch->device->id;
379 lun = 0;
380 if (data[6] & 0x20) id = data[7];
381 if (data[6] & 0x10) lun = data[6] & 7;
382 }
383 }
384 if (-1 != id) {
385 if (verbose)
386 printk("ID %i, LUN %i, ",id,lun);
387 ch->dt[elem] =
388 scsi_device_lookup(ch->device->host,
389 ch->device->channel,
390 id,lun);
391 if (!ch->dt[elem]) {
392 /* should not happen */
393 if (verbose)
394 printk("Huh? device not found!\n");
395 } else {
396 if (verbose)
397 printk("name: %8.8s %16.16s %4.4s\n",
398 ch->dt[elem]->vendor,
399 ch->dt[elem]->model,
400 ch->dt[elem]->rev);
401 }
402 }
403 }
404 ch->voltags = 1;
405 kfree(buffer);
406
407 return 0;
408 }
409
410 /* ------------------------------------------------------------------------ */
411
412 static int
413 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
414 {
415 u_char cmd[10];
416
417 dprintk("position: 0x%x\n",elem);
418 if (0 == trans)
419 trans = ch->firsts[CHET_MT];
420 memset(cmd,0,sizeof(cmd));
421 cmd[0] = POSITION_TO_ELEMENT;
422 cmd[1] = ch->device->lun << 5;
423 cmd[2] = (trans >> 8) & 0xff;
424 cmd[3] = trans & 0xff;
425 cmd[4] = (elem >> 8) & 0xff;
426 cmd[5] = elem & 0xff;
427 cmd[8] = rotate ? 1 : 0;
428 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
429 }
430
431 static int
432 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
433 {
434 u_char cmd[12];
435
436 dprintk("move: 0x%x => 0x%x\n",src,dest);
437 if (0 == trans)
438 trans = ch->firsts[CHET_MT];
439 memset(cmd,0,sizeof(cmd));
440 cmd[0] = MOVE_MEDIUM;
441 cmd[1] = ch->device->lun << 5;
442 cmd[2] = (trans >> 8) & 0xff;
443 cmd[3] = trans & 0xff;
444 cmd[4] = (src >> 8) & 0xff;
445 cmd[5] = src & 0xff;
446 cmd[6] = (dest >> 8) & 0xff;
447 cmd[7] = dest & 0xff;
448 cmd[10] = rotate ? 1 : 0;
449 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
450 }
451
452 static int
453 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
454 u_int dest1, u_int dest2, int rotate1, int rotate2)
455 {
456 u_char cmd[12];
457
458 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
459 src,dest1,dest2);
460 if (0 == trans)
461 trans = ch->firsts[CHET_MT];
462 memset(cmd,0,sizeof(cmd));
463 cmd[0] = EXCHANGE_MEDIUM;
464 cmd[1] = ch->device->lun << 5;
465 cmd[2] = (trans >> 8) & 0xff;
466 cmd[3] = trans & 0xff;
467 cmd[4] = (src >> 8) & 0xff;
468 cmd[5] = src & 0xff;
469 cmd[6] = (dest1 >> 8) & 0xff;
470 cmd[7] = dest1 & 0xff;
471 cmd[8] = (dest2 >> 8) & 0xff;
472 cmd[9] = dest2 & 0xff;
473 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
474
475 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
476 }
477
478 static void
479 ch_check_voltag(char *tag)
480 {
481 int i;
482
483 for (i = 0; i < 32; i++) {
484 /* restrict to ascii */
485 if (tag[i] >= 0x7f || tag[i] < 0x20)
486 tag[i] = ' ';
487 /* don't allow search wildcards */
488 if (tag[i] == '?' ||
489 tag[i] == '*')
490 tag[i] = ' ';
491 }
492 }
493
494 static int
495 ch_set_voltag(scsi_changer *ch, u_int elem,
496 int alternate, int clear, u_char *tag)
497 {
498 u_char cmd[12];
499 u_char *buffer;
500 int result;
501
502 buffer = kzalloc(512, GFP_KERNEL);
503 if (!buffer)
504 return -ENOMEM;
505
506 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
507 clear ? "clear" : "set",
508 alternate ? "alternate" : "primary",
509 elem, tag);
510 memset(cmd,0,sizeof(cmd));
511 cmd[0] = SEND_VOLUME_TAG;
512 cmd[1] = (ch->device->lun << 5) |
513 ch_elem_to_typecode(ch,elem);
514 cmd[2] = (elem >> 8) & 0xff;
515 cmd[3] = elem & 0xff;
516 cmd[5] = clear
517 ? (alternate ? 0x0d : 0x0c)
518 : (alternate ? 0x0b : 0x0a);
519
520 cmd[9] = 255;
521
522 memcpy(buffer,tag,32);
523 ch_check_voltag(buffer);
524
525 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
526 kfree(buffer);
527 return result;
528 }
529
530 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
531 {
532 int retval = 0;
533 u_char data[16];
534 unsigned int i;
535
536 mutex_lock(&ch->lock);
537 for (i = 0; i < ch->counts[type]; i++) {
538 if (0 != ch_read_element_status
539 (ch, ch->firsts[type]+i,data)) {
540 retval = -EIO;
541 break;
542 }
543 put_user(data[2], dest+i);
544 if (data[2] & CESTATUS_EXCEPT)
545 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
546 ch->firsts[type]+i,
547 (int)data[4],(int)data[5]);
548 retval = ch_read_element_status
549 (ch, ch->firsts[type]+i,data);
550 if (0 != retval)
551 break;
552 }
553 mutex_unlock(&ch->lock);
554 return retval;
555 }
556
557 /* ------------------------------------------------------------------------ */
558
559 static int
560 ch_release(struct inode *inode, struct file *file)
561 {
562 scsi_changer *ch = file->private_data;
563
564 scsi_device_put(ch->device);
565 file->private_data = NULL;
566 return 0;
567 }
568
569 static int
570 ch_open(struct inode *inode, struct file *file)
571 {
572 scsi_changer *ch;
573 int minor = iminor(inode);
574
575 lock_kernel();
576 spin_lock(&ch_index_lock);
577 ch = idr_find(&ch_index_idr, minor);
578
579 if (NULL == ch || scsi_device_get(ch->device)) {
580 spin_unlock(&ch_index_lock);
581 unlock_kernel();
582 return -ENXIO;
583 }
584 spin_unlock(&ch_index_lock);
585
586 file->private_data = ch;
587 unlock_kernel();
588 return 0;
589 }
590
591 static int
592 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
593 {
594 if (type >= CH_TYPES || unit >= ch->counts[type])
595 return -1;
596 return 0;
597 }
598
599 static long ch_ioctl(struct file *file,
600 unsigned int cmd, unsigned long arg)
601 {
602 scsi_changer *ch = file->private_data;
603 int retval;
604 void __user *argp = (void __user *)arg;
605
606 switch (cmd) {
607 case CHIOGPARAMS:
608 {
609 struct changer_params params;
610
611 params.cp_curpicker = 0;
612 params.cp_npickers = ch->counts[CHET_MT];
613 params.cp_nslots = ch->counts[CHET_ST];
614 params.cp_nportals = ch->counts[CHET_IE];
615 params.cp_ndrives = ch->counts[CHET_DT];
616
617 if (copy_to_user(argp, &params, sizeof(params)))
618 return -EFAULT;
619 return 0;
620 }
621 case CHIOGVPARAMS:
622 {
623 struct changer_vendor_params vparams;
624
625 memset(&vparams,0,sizeof(vparams));
626 if (ch->counts[CHET_V1]) {
627 vparams.cvp_n1 = ch->counts[CHET_V1];
628 strncpy(vparams.cvp_label1,vendor_labels[0],16);
629 }
630 if (ch->counts[CHET_V2]) {
631 vparams.cvp_n2 = ch->counts[CHET_V2];
632 strncpy(vparams.cvp_label2,vendor_labels[1],16);
633 }
634 if (ch->counts[CHET_V3]) {
635 vparams.cvp_n3 = ch->counts[CHET_V3];
636 strncpy(vparams.cvp_label3,vendor_labels[2],16);
637 }
638 if (ch->counts[CHET_V4]) {
639 vparams.cvp_n4 = ch->counts[CHET_V4];
640 strncpy(vparams.cvp_label4,vendor_labels[3],16);
641 }
642 if (copy_to_user(argp, &vparams, sizeof(vparams)))
643 return -EFAULT;
644 return 0;
645 }
646
647 case CHIOPOSITION:
648 {
649 struct changer_position pos;
650
651 if (copy_from_user(&pos, argp, sizeof (pos)))
652 return -EFAULT;
653
654 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
655 dprintk("CHIOPOSITION: invalid parameter\n");
656 return -EBADSLT;
657 }
658 mutex_lock(&ch->lock);
659 retval = ch_position(ch,0,
660 ch->firsts[pos.cp_type] + pos.cp_unit,
661 pos.cp_flags & CP_INVERT);
662 mutex_unlock(&ch->lock);
663 return retval;
664 }
665
666 case CHIOMOVE:
667 {
668 struct changer_move mv;
669
670 if (copy_from_user(&mv, argp, sizeof (mv)))
671 return -EFAULT;
672
673 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
674 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
675 dprintk("CHIOMOVE: invalid parameter\n");
676 return -EBADSLT;
677 }
678
679 mutex_lock(&ch->lock);
680 retval = ch_move(ch,0,
681 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
682 ch->firsts[mv.cm_totype] + mv.cm_tounit,
683 mv.cm_flags & CM_INVERT);
684 mutex_unlock(&ch->lock);
685 return retval;
686 }
687
688 case CHIOEXCHANGE:
689 {
690 struct changer_exchange mv;
691
692 if (copy_from_user(&mv, argp, sizeof (mv)))
693 return -EFAULT;
694
695 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
696 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
697 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
698 dprintk("CHIOEXCHANGE: invalid parameter\n");
699 return -EBADSLT;
700 }
701
702 mutex_lock(&ch->lock);
703 retval = ch_exchange
704 (ch,0,
705 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
706 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
707 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
708 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
709 mutex_unlock(&ch->lock);
710 return retval;
711 }
712
713 case CHIOGSTATUS:
714 {
715 struct changer_element_status ces;
716
717 if (copy_from_user(&ces, argp, sizeof (ces)))
718 return -EFAULT;
719 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
720 return -EINVAL;
721
722 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
723 }
724
725 case CHIOGELEM:
726 {
727 struct changer_get_element cge;
728 u_char ch_cmd[12];
729 u_char *buffer;
730 unsigned int elem;
731 int result,i;
732
733 if (copy_from_user(&cge, argp, sizeof (cge)))
734 return -EFAULT;
735
736 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
737 return -EINVAL;
738 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
739
740 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
741 if (!buffer)
742 return -ENOMEM;
743 mutex_lock(&ch->lock);
744
745 voltag_retry:
746 memset(ch_cmd, 0, sizeof(ch_cmd));
747 ch_cmd[0] = READ_ELEMENT_STATUS;
748 ch_cmd[1] = (ch->device->lun << 5) |
749 (ch->voltags ? 0x10 : 0) |
750 ch_elem_to_typecode(ch,elem);
751 ch_cmd[2] = (elem >> 8) & 0xff;
752 ch_cmd[3] = elem & 0xff;
753 ch_cmd[5] = 1;
754 ch_cmd[9] = 255;
755
756 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
757 if (!result) {
758 cge.cge_status = buffer[18];
759 cge.cge_flags = 0;
760 if (buffer[18] & CESTATUS_EXCEPT) {
761 cge.cge_errno = EIO;
762 }
763 if (buffer[25] & 0x80) {
764 cge.cge_flags |= CGE_SRC;
765 if (buffer[25] & 0x40)
766 cge.cge_flags |= CGE_INVERT;
767 elem = (buffer[26]<<8) | buffer[27];
768 for (i = 0; i < 4; i++) {
769 if (elem >= ch->firsts[i] &&
770 elem < ch->firsts[i] + ch->counts[i]) {
771 cge.cge_srctype = i;
772 cge.cge_srcunit = elem-ch->firsts[i];
773 }
774 }
775 }
776 if ((buffer[22] & 0x30) == 0x30) {
777 cge.cge_flags |= CGE_IDLUN;
778 cge.cge_id = buffer[23];
779 cge.cge_lun = buffer[22] & 7;
780 }
781 if (buffer[9] & 0x80) {
782 cge.cge_flags |= CGE_PVOLTAG;
783 memcpy(cge.cge_pvoltag,buffer+28,36);
784 }
785 if (buffer[9] & 0x40) {
786 cge.cge_flags |= CGE_AVOLTAG;
787 memcpy(cge.cge_avoltag,buffer+64,36);
788 }
789 } else if (ch->voltags) {
790 ch->voltags = 0;
791 vprintk("device has no volume tag support\n");
792 goto voltag_retry;
793 }
794 kfree(buffer);
795 mutex_unlock(&ch->lock);
796
797 if (copy_to_user(argp, &cge, sizeof (cge)))
798 return -EFAULT;
799 return result;
800 }
801
802 case CHIOINITELEM:
803 {
804 mutex_lock(&ch->lock);
805 retval = ch_init_elem(ch);
806 mutex_unlock(&ch->lock);
807 return retval;
808 }
809
810 case CHIOSVOLTAG:
811 {
812 struct changer_set_voltag csv;
813 int elem;
814
815 if (copy_from_user(&csv, argp, sizeof(csv)))
816 return -EFAULT;
817
818 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
819 dprintk("CHIOSVOLTAG: invalid parameter\n");
820 return -EBADSLT;
821 }
822 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
823 mutex_lock(&ch->lock);
824 retval = ch_set_voltag(ch, elem,
825 csv.csv_flags & CSV_AVOLTAG,
826 csv.csv_flags & CSV_CLEARTAG,
827 csv.csv_voltag);
828 mutex_unlock(&ch->lock);
829 return retval;
830 }
831
832 default:
833 return scsi_ioctl(ch->device, cmd, argp);
834
835 }
836 }
837
838 #ifdef CONFIG_COMPAT
839
840 struct changer_element_status32 {
841 int ces_type;
842 compat_uptr_t ces_data;
843 };
844 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
845
846 static long ch_ioctl_compat(struct file * file,
847 unsigned int cmd, unsigned long arg)
848 {
849 scsi_changer *ch = file->private_data;
850
851 switch (cmd) {
852 case CHIOGPARAMS:
853 case CHIOGVPARAMS:
854 case CHIOPOSITION:
855 case CHIOMOVE:
856 case CHIOEXCHANGE:
857 case CHIOGELEM:
858 case CHIOINITELEM:
859 case CHIOSVOLTAG:
860 /* compatible */
861 return ch_ioctl(file, cmd, arg);
862 case CHIOGSTATUS32:
863 {
864 struct changer_element_status32 ces32;
865 unsigned char __user *data;
866
867 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
868 return -EFAULT;
869 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
870 return -EINVAL;
871
872 data = compat_ptr(ces32.ces_data);
873 return ch_gstatus(ch, ces32.ces_type, data);
874 }
875 default:
876 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
877 return -ENOIOCTLCMD;
878
879 }
880 }
881 #endif
882
883 /* ------------------------------------------------------------------------ */
884
885 static int ch_probe(struct device *dev)
886 {
887 struct scsi_device *sd = to_scsi_device(dev);
888 struct device *class_dev;
889 int minor, ret = -ENOMEM;
890 scsi_changer *ch;
891
892 if (sd->type != TYPE_MEDIUM_CHANGER)
893 return -ENODEV;
894
895 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
896 if (NULL == ch)
897 return -ENOMEM;
898
899 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
900 goto free_ch;
901
902 spin_lock(&ch_index_lock);
903 ret = idr_get_new(&ch_index_idr, ch, &minor);
904 spin_unlock(&ch_index_lock);
905
906 if (ret)
907 goto free_ch;
908
909 if (minor > CH_MAX_DEVS) {
910 ret = -ENODEV;
911 goto remove_idr;
912 }
913
914 ch->minor = minor;
915 sprintf(ch->name,"ch%d",ch->minor);
916
917 class_dev = device_create(ch_sysfs_class, dev,
918 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
919 "s%s", ch->name);
920 if (IS_ERR(class_dev)) {
921 printk(KERN_WARNING "ch%d: device_create failed\n",
922 ch->minor);
923 ret = PTR_ERR(class_dev);
924 goto remove_idr;
925 }
926
927 mutex_init(&ch->lock);
928 ch->device = sd;
929 ch_readconfig(ch);
930 if (init)
931 ch_init_elem(ch);
932
933 dev_set_drvdata(dev, ch);
934 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
935
936 return 0;
937 remove_idr:
938 idr_remove(&ch_index_idr, minor);
939 free_ch:
940 kfree(ch);
941 return ret;
942 }
943
944 static int ch_remove(struct device *dev)
945 {
946 scsi_changer *ch = dev_get_drvdata(dev);
947
948 spin_lock(&ch_index_lock);
949 idr_remove(&ch_index_idr, ch->minor);
950 spin_unlock(&ch_index_lock);
951
952 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
953 kfree(ch->dt);
954 kfree(ch);
955 return 0;
956 }
957
958 static struct scsi_driver ch_template = {
959 .owner = THIS_MODULE,
960 .gendrv = {
961 .name = "ch",
962 .probe = ch_probe,
963 .remove = ch_remove,
964 },
965 };
966
967 static const struct file_operations changer_fops = {
968 .owner = THIS_MODULE,
969 .open = ch_open,
970 .release = ch_release,
971 .unlocked_ioctl = ch_ioctl,
972 #ifdef CONFIG_COMPAT
973 .compat_ioctl = ch_ioctl_compat,
974 #endif
975 };
976
977 static int __init init_ch_module(void)
978 {
979 int rc;
980
981 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
982 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
983 if (IS_ERR(ch_sysfs_class)) {
984 rc = PTR_ERR(ch_sysfs_class);
985 return rc;
986 }
987 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
988 if (rc < 0) {
989 printk("Unable to get major %d for SCSI-Changer\n",
990 SCSI_CHANGER_MAJOR);
991 goto fail1;
992 }
993 rc = scsi_register_driver(&ch_template.gendrv);
994 if (rc < 0)
995 goto fail2;
996 return 0;
997
998 fail2:
999 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1000 fail1:
1001 class_destroy(ch_sysfs_class);
1002 return rc;
1003 }
1004
1005 static void __exit exit_ch_module(void)
1006 {
1007 scsi_unregister_driver(&ch_template.gendrv);
1008 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1009 class_destroy(ch_sysfs_class);
1010 idr_destroy(&ch_index_idr);
1011 }
1012
1013 module_init(init_ch_module);
1014 module_exit(exit_ch_module);
1015
1016 /*
1017 * Local variables:
1018 * c-basic-offset: 8
1019 * End:
1020 */
linux kernel for loongson