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[PATCH] radix-tree documentation cleanups
[linux-2.6/mini2440.git] / drivers / scsi / ch.c
blobd9abd1645d1550ab7d693e652843fd7acf6a4d42
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/compat.h>
24 #include <linux/chio.h> /* here are all the ioctls */
25 #include <linux/mutex.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
39 MODULE_DESCRIPTION("device driver for scsi media changer devices");
40 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
41 MODULE_LICENSE("GPL");
42 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
43
44 static int init = 1;
45 module_param(init, int, 0444);
46 MODULE_PARM_DESC(init, \
47 "initialize element status on driver load (default: on)");
48
49 static int timeout_move = 300;
50 module_param(timeout_move, int, 0644);
51 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
52 "(default: 300 seconds)");
53
54 static int timeout_init = 3600;
55 module_param(timeout_init, int, 0644);
56 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
57 "(default: 3600 seconds)");
58
59 static int verbose = 1;
60 module_param(verbose, int, 0644);
61 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
62
63 static int debug = 0;
64 module_param(debug, int, 0644);
65 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
66 "detailed sense codes on scsi errors (default: off)");
67
68 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
69 static int dt_lun[CH_DT_MAX];
70 module_param_array(dt_id, int, NULL, 0444);
71 module_param_array(dt_lun, int, NULL, 0444);
72
73 /* tell the driver about vendor-specific slots */
74 static int vendor_firsts[CH_TYPES-4];
75 static int vendor_counts[CH_TYPES-4];
76 module_param_array(vendor_firsts, int, NULL, 0444);
77 module_param_array(vendor_counts, int, NULL, 0444);
78
79 static const 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
93 static int ch_probe(struct device *);
94 static int ch_remove(struct device *);
95 static int ch_open(struct inode * inode, struct file * filp);
96 static int ch_release(struct inode * inode, struct file * filp);
97 static int ch_ioctl(struct inode * inode, struct file * filp,
98 unsigned int cmd, unsigned long arg);
99 #ifdef CONFIG_COMPAT
100 static long ch_ioctl_compat(struct file * filp,
101 unsigned int cmd, unsigned long arg);
102 #endif
103
104 static struct class * ch_sysfs_class;
105
106 typedef 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 mutex lock;
117 } scsi_changer;
118
119 static LIST_HEAD(ch_devlist);
120 static DEFINE_SPINLOCK(ch_devlist_lock);
121 static int ch_devcount;
122
123 static 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
133 static 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
144 static const 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
184 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
185 {
186 int i,errno = 0;
187
188 /* Check to see if additional sense information is available */
189 if (scsi_sense_valid(sshdr) &&
190 sshdr->asc != 0) {
191 for (i = 0; err[i].errno != 0; i++) {
192 if (err[i].sense == sshdr->sense_key &&
193 err[i].asc == sshdr->asc &&
194 err[i].ascq == sshdr->ascq) {
195 errno = -err[i].errno;
196 break;
197 }
198 }
199 }
200 if (errno == 0)
201 errno = -EIO;
202 return errno;
203 }
204
205 static int
206 ch_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, result;
211 struct scsi_sense_hdr sshdr;
212
213 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
214 ? timeout_init : timeout_move;
215
216 retry:
217 errno = 0;
218 if (debug) {
219 dprintk("command: ");
220 __scsi_print_command(cmd);
221 }
222
223 result = scsi_execute_req(ch->device, cmd, direction, buffer,
224 buflength, &sshdr, timeout * HZ,
225 MAX_RETRIES);
226
227 dprintk("result: 0x%x\n",result);
228 if (driver_byte(result) & DRIVER_SENSE) {
229 if (debug)
230 scsi_print_sense_hdr(ch->name, &sshdr);
231 errno = ch_find_errno(&sshdr);
232
233 switch(sshdr.sense_key) {
234 case UNIT_ATTENTION:
235 ch->unit_attention = 1;
236 if (retries++ < 3)
237 goto retry;
238 break;
239 }
240 }
241 return errno;
242 }
243
244 /* ------------------------------------------------------------------------ */
245
246 static int
247 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
248 {
249 int i;
250
251 for (i = 0; i < CH_TYPES; i++) {
252 if (elem >= ch->firsts[i] &&
253 elem < ch->firsts[i] +
254 ch->counts[i])
255 return i+1;
256 }
257 return 0;
258 }
259
260 static int
261 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
262 {
263 u_char cmd[12];
264 u_char *buffer;
265 int result;
266
267 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
268 if(!buffer)
269 return -ENOMEM;
270
271 retry:
272 memset(cmd,0,sizeof(cmd));
273 cmd[0] = READ_ELEMENT_STATUS;
274 cmd[1] = (ch->device->lun << 5) |
275 (ch->voltags ? 0x10 : 0) |
276 ch_elem_to_typecode(ch,elem);
277 cmd[2] = (elem >> 8) & 0xff;
278 cmd[3] = elem & 0xff;
279 cmd[5] = 1;
280 cmd[9] = 255;
281 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
282 if (((buffer[16] << 8) | buffer[17]) != elem) {
283 dprintk("asked for element 0x%02x, got 0x%02x\n",
284 elem,(buffer[16] << 8) | buffer[17]);
285 kfree(buffer);
286 return -EIO;
287 }
288 memcpy(data,buffer+16,16);
289 } else {
290 if (ch->voltags) {
291 ch->voltags = 0;
292 vprintk("device has no volume tag support\n");
293 goto retry;
294 }
295 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
296 }
297 kfree(buffer);
298 return result;
299 }
300
301 static int
302 ch_init_elem(scsi_changer *ch)
303 {
304 int err;
305 u_char cmd[6];
306
307 vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
308 memset(cmd,0,sizeof(cmd));
309 cmd[0] = INITIALIZE_ELEMENT_STATUS;
310 cmd[1] = ch->device->lun << 5;
311 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
312 vprintk("... finished\n");
313 return err;
314 }
315
316 static int
317 ch_readconfig(scsi_changer *ch)
318 {
319 u_char cmd[10], data[16];
320 u_char *buffer;
321 int result,id,lun,i;
322 u_int elem;
323
324 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
325 if (!buffer)
326 return -ENOMEM;
327 memset(buffer,0,512);
328
329 memset(cmd,0,sizeof(cmd));
330 cmd[0] = MODE_SENSE;
331 cmd[1] = ch->device->lun << 5;
332 cmd[2] = 0x1d;
333 cmd[4] = 255;
334 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
335 if (0 != result) {
336 cmd[1] |= (1<<3);
337 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
338 }
339 if (0 == result) {
340 ch->firsts[CHET_MT] =
341 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
342 ch->counts[CHET_MT] =
343 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
344 ch->firsts[CHET_ST] =
345 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
346 ch->counts[CHET_ST] =
347 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
348 ch->firsts[CHET_IE] =
349 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
350 ch->counts[CHET_IE] =
351 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
352 ch->firsts[CHET_DT] =
353 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
354 ch->counts[CHET_DT] =
355 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
356 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
357 ch->firsts[CHET_MT],
358 ch->counts[CHET_MT]);
359 vprintk("type #2 (st): 0x%x+%d [storage]\n",
360 ch->firsts[CHET_ST],
361 ch->counts[CHET_ST]);
362 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
363 ch->firsts[CHET_IE],
364 ch->counts[CHET_IE]);
365 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
366 ch->firsts[CHET_DT],
367 ch->counts[CHET_DT]);
368 } else {
369 vprintk("reading element address assigment page failed!\n");
370 }
371
372 /* vendor specific element types */
373 for (i = 0; i < 4; i++) {
374 if (0 == vendor_counts[i])
375 continue;
376 if (NULL == vendor_labels[i])
377 continue;
378 ch->firsts[CHET_V1+i] = vendor_firsts[i];
379 ch->counts[CHET_V1+i] = vendor_counts[i];
380 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
381 i+5,i+1,vendor_firsts[i],vendor_counts[i],
382 vendor_labels[i]);
383 }
384
385 /* look up the devices of the data transfer elements */
386 ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
387 GFP_KERNEL);
388 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
389 id = -1;
390 lun = 0;
391 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
392 id = dt_id[elem];
393 lun = dt_lun[elem];
394 vprintk("dt 0x%x: [insmod option] ",
395 elem+ch->firsts[CHET_DT]);
396 } else if (0 != ch_read_element_status
397 (ch,elem+ch->firsts[CHET_DT],data)) {
398 vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
399 elem+ch->firsts[CHET_DT]);
400 } else {
401 vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
402 if (data[6] & 0x80) {
403 if (verbose)
404 printk("not this SCSI bus\n");
405 ch->dt[elem] = NULL;
406 } else if (0 == (data[6] & 0x30)) {
407 if (verbose)
408 printk("ID/LUN unknown\n");
409 ch->dt[elem] = NULL;
410 } else {
411 id = ch->device->id;
412 lun = 0;
413 if (data[6] & 0x20) id = data[7];
414 if (data[6] & 0x10) lun = data[6] & 7;
415 }
416 }
417 if (-1 != id) {
418 if (verbose)
419 printk("ID %i, LUN %i, ",id,lun);
420 ch->dt[elem] =
421 scsi_device_lookup(ch->device->host,
422 ch->device->channel,
423 id,lun);
424 if (!ch->dt[elem]) {
425 /* should not happen */
426 if (verbose)
427 printk("Huh? device not found!\n");
428 } else {
429 if (verbose)
430 printk("name: %8.8s %16.16s %4.4s\n",
431 ch->dt[elem]->vendor,
432 ch->dt[elem]->model,
433 ch->dt[elem]->rev);
434 }
435 }
436 }
437 ch->voltags = 1;
438 kfree(buffer);
439
440 return 0;
441 }
442
443 /* ------------------------------------------------------------------------ */
444
445 static int
446 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
447 {
448 u_char cmd[10];
449
450 dprintk("position: 0x%x\n",elem);
451 if (0 == trans)
452 trans = ch->firsts[CHET_MT];
453 memset(cmd,0,sizeof(cmd));
454 cmd[0] = POSITION_TO_ELEMENT;
455 cmd[1] = ch->device->lun << 5;
456 cmd[2] = (trans >> 8) & 0xff;
457 cmd[3] = trans & 0xff;
458 cmd[4] = (elem >> 8) & 0xff;
459 cmd[5] = elem & 0xff;
460 cmd[8] = rotate ? 1 : 0;
461 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
462 }
463
464 static int
465 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
466 {
467 u_char cmd[12];
468
469 dprintk("move: 0x%x => 0x%x\n",src,dest);
470 if (0 == trans)
471 trans = ch->firsts[CHET_MT];
472 memset(cmd,0,sizeof(cmd));
473 cmd[0] = MOVE_MEDIUM;
474 cmd[1] = ch->device->lun << 5;
475 cmd[2] = (trans >> 8) & 0xff;
476 cmd[3] = trans & 0xff;
477 cmd[4] = (src >> 8) & 0xff;
478 cmd[5] = src & 0xff;
479 cmd[6] = (dest >> 8) & 0xff;
480 cmd[7] = dest & 0xff;
481 cmd[10] = rotate ? 1 : 0;
482 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
483 }
484
485 static int
486 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
487 u_int dest1, u_int dest2, int rotate1, int rotate2)
488 {
489 u_char cmd[12];
490
491 dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
492 src,dest1,dest2);
493 if (0 == trans)
494 trans = ch->firsts[CHET_MT];
495 memset(cmd,0,sizeof(cmd));
496 cmd[0] = EXCHANGE_MEDIUM;
497 cmd[1] = ch->device->lun << 5;
498 cmd[2] = (trans >> 8) & 0xff;
499 cmd[3] = trans & 0xff;
500 cmd[4] = (src >> 8) & 0xff;
501 cmd[5] = src & 0xff;
502 cmd[6] = (dest1 >> 8) & 0xff;
503 cmd[7] = dest1 & 0xff;
504 cmd[8] = (dest2 >> 8) & 0xff;
505 cmd[9] = dest2 & 0xff;
506 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
507
508 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
509 }
510
511 static void
512 ch_check_voltag(char *tag)
513 {
514 int i;
515
516 for (i = 0; i < 32; i++) {
517 /* restrict to ascii */
518 if (tag[i] >= 0x7f || tag[i] < 0x20)
519 tag[i] = ' ';
520 /* don't allow search wildcards */
521 if (tag[i] == '?' ||
522 tag[i] == '*')
523 tag[i] = ' ';
524 }
525 }
526
527 static int
528 ch_set_voltag(scsi_changer *ch, u_int elem,
529 int alternate, int clear, u_char *tag)
530 {
531 u_char cmd[12];
532 u_char *buffer;
533 int result;
534
535 buffer = kmalloc(512, GFP_KERNEL);
536 if (!buffer)
537 return -ENOMEM;
538 memset(buffer,0,512);
539
540 dprintk("%s %s voltag: 0x%x => \"%s\"\n",
541 clear ? "clear" : "set",
542 alternate ? "alternate" : "primary",
543 elem, tag);
544 memset(cmd,0,sizeof(cmd));
545 cmd[0] = SEND_VOLUME_TAG;
546 cmd[1] = (ch->device->lun << 5) |
547 ch_elem_to_typecode(ch,elem);
548 cmd[2] = (elem >> 8) & 0xff;
549 cmd[3] = elem & 0xff;
550 cmd[5] = clear
551 ? (alternate ? 0x0d : 0x0c)
552 : (alternate ? 0x0b : 0x0a);
553
554 cmd[9] = 255;
555
556 memcpy(buffer,tag,32);
557 ch_check_voltag(buffer);
558
559 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
560 kfree(buffer);
561 return result;
562 }
563
564 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
565 {
566 int retval = 0;
567 u_char data[16];
568 unsigned int i;
569
570 mutex_lock(&ch->lock);
571 for (i = 0; i < ch->counts[type]; i++) {
572 if (0 != ch_read_element_status
573 (ch, ch->firsts[type]+i,data)) {
574 retval = -EIO;
575 break;
576 }
577 put_user(data[2], dest+i);
578 if (data[2] & CESTATUS_EXCEPT)
579 vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
580 ch->firsts[type]+i,
581 (int)data[4],(int)data[5]);
582 retval = ch_read_element_status
583 (ch, ch->firsts[type]+i,data);
584 if (0 != retval)
585 break;
586 }
587 mutex_unlock(&ch->lock);
588 return retval;
589 }
590
591 /* ------------------------------------------------------------------------ */
592
593 static int
594 ch_release(struct inode *inode, struct file *file)
595 {
596 scsi_changer *ch = file->private_data;
597
598 scsi_device_put(ch->device);
599 file->private_data = NULL;
600 return 0;
601 }
602
603 static int
604 ch_open(struct inode *inode, struct file *file)
605 {
606 scsi_changer *tmp, *ch;
607 int minor = iminor(inode);
608
609 spin_lock(&ch_devlist_lock);
610 ch = NULL;
611 list_for_each_entry(tmp,&ch_devlist,list) {
612 if (tmp->minor == minor)
613 ch = tmp;
614 }
615 if (NULL == ch || scsi_device_get(ch->device)) {
616 spin_unlock(&ch_devlist_lock);
617 return -ENXIO;
618 }
619 spin_unlock(&ch_devlist_lock);
620
621 file->private_data = ch;
622 return 0;
623 }
624
625 static int
626 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
627 {
628 if (type >= CH_TYPES || unit >= ch->counts[type])
629 return -1;
630 return 0;
631 }
632
633 static int ch_ioctl(struct inode * inode, struct file * file,
634 unsigned int cmd, unsigned long arg)
635 {
636 scsi_changer *ch = file->private_data;
637 int retval;
638 void __user *argp = (void __user *)arg;
639
640 switch (cmd) {
641 case CHIOGPARAMS:
642 {
643 struct changer_params params;
644
645 params.cp_curpicker = 0;
646 params.cp_npickers = ch->counts[CHET_MT];
647 params.cp_nslots = ch->counts[CHET_ST];
648 params.cp_nportals = ch->counts[CHET_IE];
649 params.cp_ndrives = ch->counts[CHET_DT];
650
651 if (copy_to_user(argp, &params, sizeof(params)))
652 return -EFAULT;
653 return 0;
654 }
655 case CHIOGVPARAMS:
656 {
657 struct changer_vendor_params vparams;
658
659 memset(&vparams,0,sizeof(vparams));
660 if (ch->counts[CHET_V1]) {
661 vparams.cvp_n1 = ch->counts[CHET_V1];
662 strncpy(vparams.cvp_label1,vendor_labels[0],16);
663 }
664 if (ch->counts[CHET_V2]) {
665 vparams.cvp_n2 = ch->counts[CHET_V2];
666 strncpy(vparams.cvp_label2,vendor_labels[1],16);
667 }
668 if (ch->counts[CHET_V3]) {
669 vparams.cvp_n3 = ch->counts[CHET_V3];
670 strncpy(vparams.cvp_label3,vendor_labels[2],16);
671 }
672 if (ch->counts[CHET_V4]) {
673 vparams.cvp_n4 = ch->counts[CHET_V4];
674 strncpy(vparams.cvp_label4,vendor_labels[3],16);
675 }
676 if (copy_to_user(argp, &vparams, sizeof(vparams)))
677 return -EFAULT;
678 return 0;
679 }
680
681 case CHIOPOSITION:
682 {
683 struct changer_position pos;
684
685 if (copy_from_user(&pos, argp, sizeof (pos)))
686 return -EFAULT;
687
688 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
689 dprintk("CHIOPOSITION: invalid parameter\n");
690 return -EBADSLT;
691 }
692 mutex_lock(&ch->lock);
693 retval = ch_position(ch,0,
694 ch->firsts[pos.cp_type] + pos.cp_unit,
695 pos.cp_flags & CP_INVERT);
696 mutex_unlock(&ch->lock);
697 return retval;
698 }
699
700 case CHIOMOVE:
701 {
702 struct changer_move mv;
703
704 if (copy_from_user(&mv, argp, sizeof (mv)))
705 return -EFAULT;
706
707 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
708 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
709 dprintk("CHIOMOVE: invalid parameter\n");
710 return -EBADSLT;
711 }
712
713 mutex_lock(&ch->lock);
714 retval = ch_move(ch,0,
715 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
716 ch->firsts[mv.cm_totype] + mv.cm_tounit,
717 mv.cm_flags & CM_INVERT);
718 mutex_unlock(&ch->lock);
719 return retval;
720 }
721
722 case CHIOEXCHANGE:
723 {
724 struct changer_exchange mv;
725
726 if (copy_from_user(&mv, argp, sizeof (mv)))
727 return -EFAULT;
728
729 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
730 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
731 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
732 dprintk("CHIOEXCHANGE: invalid parameter\n");
733 return -EBADSLT;
734 }
735
736 mutex_lock(&ch->lock);
737 retval = ch_exchange
738 (ch,0,
739 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
740 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
741 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
742 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
743 mutex_unlock(&ch->lock);
744 return retval;
745 }
746
747 case CHIOGSTATUS:
748 {
749 struct changer_element_status ces;
750
751 if (copy_from_user(&ces, argp, sizeof (ces)))
752 return -EFAULT;
753 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
754 return -EINVAL;
755
756 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
757 }
758
759 case CHIOGELEM:
760 {
761 struct changer_get_element cge;
762 u_char cmd[12];
763 u_char *buffer;
764 unsigned int elem;
765 int result,i;
766
767 if (copy_from_user(&cge, argp, sizeof (cge)))
768 return -EFAULT;
769
770 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
771 return -EINVAL;
772 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
773
774 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
775 if (!buffer)
776 return -ENOMEM;
777 mutex_lock(&ch->lock);
778
779 voltag_retry:
780 memset(cmd,0,sizeof(cmd));
781 cmd[0] = READ_ELEMENT_STATUS;
782 cmd[1] = (ch->device->lun << 5) |
783 (ch->voltags ? 0x10 : 0) |
784 ch_elem_to_typecode(ch,elem);
785 cmd[2] = (elem >> 8) & 0xff;
786 cmd[3] = elem & 0xff;
787 cmd[5] = 1;
788 cmd[9] = 255;
789
790 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
791 cge.cge_status = buffer[18];
792 cge.cge_flags = 0;
793 if (buffer[18] & CESTATUS_EXCEPT) {
794 cge.cge_errno = EIO;
795 }
796 if (buffer[25] & 0x80) {
797 cge.cge_flags |= CGE_SRC;
798 if (buffer[25] & 0x40)
799 cge.cge_flags |= CGE_INVERT;
800 elem = (buffer[26]<<8) | buffer[27];
801 for (i = 0; i < 4; i++) {
802 if (elem >= ch->firsts[i] &&
803 elem < ch->firsts[i] + ch->counts[i]) {
804 cge.cge_srctype = i;
805 cge.cge_srcunit = elem-ch->firsts[i];
806 }
807 }
808 }
809 if ((buffer[22] & 0x30) == 0x30) {
810 cge.cge_flags |= CGE_IDLUN;
811 cge.cge_id = buffer[23];
812 cge.cge_lun = buffer[22] & 7;
813 }
814 if (buffer[9] & 0x80) {
815 cge.cge_flags |= CGE_PVOLTAG;
816 memcpy(cge.cge_pvoltag,buffer+28,36);
817 }
818 if (buffer[9] & 0x40) {
819 cge.cge_flags |= CGE_AVOLTAG;
820 memcpy(cge.cge_avoltag,buffer+64,36);
821 }
822 } else if (ch->voltags) {
823 ch->voltags = 0;
824 vprintk("device has no volume tag support\n");
825 goto voltag_retry;
826 }
827 kfree(buffer);
828 mutex_unlock(&ch->lock);
829
830 if (copy_to_user(argp, &cge, sizeof (cge)))
831 return -EFAULT;
832 return result;
833 }
834
835 case CHIOINITELEM:
836 {
837 mutex_lock(&ch->lock);
838 retval = ch_init_elem(ch);
839 mutex_unlock(&ch->lock);
840 return retval;
841 }
842
843 case CHIOSVOLTAG:
844 {
845 struct changer_set_voltag csv;
846 int elem;
847
848 if (copy_from_user(&csv, argp, sizeof(csv)))
849 return -EFAULT;
850
851 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
852 dprintk("CHIOSVOLTAG: invalid parameter\n");
853 return -EBADSLT;
854 }
855 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
856 mutex_lock(&ch->lock);
857 retval = ch_set_voltag(ch, elem,
858 csv.csv_flags & CSV_AVOLTAG,
859 csv.csv_flags & CSV_CLEARTAG,
860 csv.csv_voltag);
861 mutex_unlock(&ch->lock);
862 return retval;
863 }
864
865 default:
866 return scsi_ioctl(ch->device, cmd, argp);
867
868 }
869 }
870
871 #ifdef CONFIG_COMPAT
872
873 struct changer_element_status32 {
874 int ces_type;
875 compat_uptr_t ces_data;
876 };
877 #define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
878
879 static long ch_ioctl_compat(struct file * file,
880 unsigned int cmd, unsigned long arg)
881 {
882 scsi_changer *ch = file->private_data;
883
884 switch (cmd) {
885 case CHIOGPARAMS:
886 case CHIOGVPARAMS:
887 case CHIOPOSITION:
888 case CHIOMOVE:
889 case CHIOEXCHANGE:
890 case CHIOGELEM:
891 case CHIOINITELEM:
892 case CHIOSVOLTAG:
893 /* compatible */
894 return ch_ioctl(NULL /* inode, unused */,
895 file, cmd, arg);
896 case CHIOGSTATUS32:
897 {
898 struct changer_element_status32 ces32;
899 unsigned char __user *data;
900
901 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
902 return -EFAULT;
903 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
904 return -EINVAL;
905
906 data = compat_ptr(ces32.ces_data);
907 return ch_gstatus(ch, ces32.ces_type, data);
908 }
909 default:
910 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
911 return -ENOIOCTLCMD;
912
913 }
914 }
915 #endif
916
917 /* ------------------------------------------------------------------------ */
918
919 static int ch_probe(struct device *dev)
920 {
921 struct scsi_device *sd = to_scsi_device(dev);
922 scsi_changer *ch;
923
924 if (sd->type != TYPE_MEDIUM_CHANGER)
925 return -ENODEV;
926
927 ch = kmalloc(sizeof(*ch), GFP_KERNEL);
928 if (NULL == ch)
929 return -ENOMEM;
930
931 memset(ch,0,sizeof(*ch));
932 ch->minor = ch_devcount;
933 sprintf(ch->name,"ch%d",ch->minor);
934 mutex_init(&ch->lock);
935 ch->device = sd;
936 ch_readconfig(ch);
937 if (init)
938 ch_init_elem(ch);
939
940 class_device_create(ch_sysfs_class, NULL,
941 MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
942 dev, "s%s", ch->name);
943
944 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
945
946 spin_lock(&ch_devlist_lock);
947 list_add_tail(&ch->list,&ch_devlist);
948 ch_devcount++;
949 spin_unlock(&ch_devlist_lock);
950 return 0;
951 }
952
953 static int ch_remove(struct device *dev)
954 {
955 struct scsi_device *sd = to_scsi_device(dev);
956 scsi_changer *tmp, *ch;
957
958 spin_lock(&ch_devlist_lock);
959 ch = NULL;
960 list_for_each_entry(tmp,&ch_devlist,list) {
961 if (tmp->device == sd)
962 ch = tmp;
963 }
964 BUG_ON(NULL == ch);
965 list_del(&ch->list);
966 spin_unlock(&ch_devlist_lock);
967
968 class_device_destroy(ch_sysfs_class,
969 MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
970 kfree(ch->dt);
971 kfree(ch);
972 ch_devcount--;
973 return 0;
974 }
975
976 static int __init init_ch_module(void)
977 {
978 int rc;
979
980 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
981 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
982 if (IS_ERR(ch_sysfs_class)) {
983 rc = PTR_ERR(ch_sysfs_class);
984 return rc;
985 }
986 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
987 if (rc < 0) {
988 printk("Unable to get major %d for SCSI-Changer\n",
989 SCSI_CHANGER_MAJOR);
990 goto fail1;
991 }
992 rc = scsi_register_driver(&ch_template.gendrv);
993 if (rc < 0)
994 goto fail2;
995 return 0;
996
997 fail2:
998 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
999 fail1:
1000 class_destroy(ch_sysfs_class);
1001 return rc;
1002 }
1003
1004 static void __exit exit_ch_module(void)
1005 {
1006 scsi_unregister_driver(&ch_template.gendrv);
1007 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1008 class_destroy(ch_sysfs_class);
1009 }
1010
1011 module_init(init_ch_module);
1012 module_exit(exit_ch_module);
1013
1014 /*
1015 * Local variables:
1016 * c-basic-offset: 8
1017 * End:
1018 */
Support for the Chinese Samsung S3C2440 based development boards