xref: /openbmc/linux/drivers/scsi/ch.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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/ioctl32.h>
24 #include <linux/compat.h>
25 #include <linux/chio.h>			/* here are all the ioctls */
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 
43 static int init = 1;
44 module_param(init, int, 0444);
45 MODULE_PARM_DESC(init, \
46     "initialize element status on driver load (default: on)");
47 
48 static int timeout_move = 300;
49 module_param(timeout_move, int, 0644);
50 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
51 		 "(default: 300 seconds)");
52 
53 static int timeout_init = 3600;
54 module_param(timeout_init, int, 0644);
55 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
56 		 "(default: 3600 seconds)");
57 
58 static int verbose = 1;
59 module_param(verbose, int, 0644);
60 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
61 
62 static int debug = 0;
63 module_param(debug, int, 0644);
64 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
65 		 "detailed sense codes on scsi errors (default: off)");
66 
67 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
68 static int dt_lun[CH_DT_MAX];
69 module_param_array(dt_id,  int, NULL, 0444);
70 module_param_array(dt_lun, int, NULL, 0444);
71 
72 /* tell the driver about vendor-specific slots */
73 static int vendor_firsts[CH_TYPES-4];
74 static int vendor_counts[CH_TYPES-4];
75 module_param_array(vendor_firsts, int, NULL, 0444);
76 module_param_array(vendor_counts, int, NULL, 0444);
77 
78 static char *vendor_labels[CH_TYPES-4] = {
79 	"v0", "v1", "v2", "v3"
80 };
81 // module_param_string_array(vendor_labels, NULL, 0444);
82 
83 #define dprintk(fmt, arg...)    if (debug) \
84         printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
85 #define vprintk(fmt, arg...)    if (verbose) \
86         printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
87 
88 /* ------------------------------------------------------------------- */
89 
90 #define MAX_RETRIES   1
91 
92 static int  ch_probe(struct device *);
93 static int  ch_remove(struct device *);
94 static int  ch_open(struct inode * inode, struct file * filp);
95 static int  ch_release(struct inode * inode, struct file * filp);
96 static int  ch_ioctl(struct inode * inode, struct file * filp,
97 		     unsigned int cmd, unsigned long arg);
98 #ifdef CONFIG_COMPAT
99 static long ch_ioctl_compat(struct file * filp,
100 			    unsigned int cmd, unsigned long arg);
101 #endif
102 
103 static struct class * ch_sysfs_class;
104 
105 typedef struct {
106 	struct list_head    list;
107 	int                 minor;
108 	char                name[8];
109 	struct scsi_device  *device;
110 	struct scsi_device  **dt;        /* ptrs to data transfer elements */
111 	u_int               firsts[CH_TYPES];
112 	u_int               counts[CH_TYPES];
113 	u_int               unit_attention;
114 	u_int		    voltags;
115 	struct semaphore    lock;
116 } scsi_changer;
117 
118 static LIST_HEAD(ch_devlist);
119 static DEFINE_SPINLOCK(ch_devlist_lock);
120 static int ch_devcount;
121 
122 static struct scsi_driver ch_template =
123 {
124 	.owner     	= THIS_MODULE,
125 	.gendrv     	= {
126 		.name	= "ch",
127 		.probe  = ch_probe,
128 		.remove = ch_remove,
129 	},
130 };
131 
132 static struct file_operations changer_fops =
133 {
134 	.owner        = THIS_MODULE,
135 	.open         = ch_open,
136 	.release      = ch_release,
137 	.ioctl        = ch_ioctl,
138 #ifdef CONFIG_COMPAT
139 	.compat_ioctl = ch_ioctl_compat,
140 #endif
141 };
142 
143 static struct {
144 	unsigned char  sense;
145 	unsigned char  asc;
146 	unsigned char  ascq;
147 	int	       errno;
148 } err[] = {
149 /* Just filled in what looks right. Hav'nt checked any standard paper for
150    these errno assignments, so they may be wrong... */
151 	{
152 		.sense  = ILLEGAL_REQUEST,
153 		.asc    = 0x21,
154 		.ascq   = 0x01,
155 		.errno  = EBADSLT, /* Invalid element address */
156 	},{
157 		.sense  = ILLEGAL_REQUEST,
158 		.asc    = 0x28,
159 		.ascq   = 0x01,
160 		.errno  = EBADE,   /* Import or export element accessed */
161 	},{
162 		.sense  = ILLEGAL_REQUEST,
163 		.asc    = 0x3B,
164 		.ascq   = 0x0D,
165 		.errno  = EXFULL,  /* Medium destination element full */
166 	},{
167 		.sense  = ILLEGAL_REQUEST,
168 		.asc    = 0x3B,
169 		.ascq   = 0x0E,
170 		.errno  = EBADE,   /* Medium source element empty */
171 	},{
172 		.sense  = ILLEGAL_REQUEST,
173 		.asc    = 0x20,
174 		.ascq   = 0x00,
175 		.errno  = EBADRQC, /* Invalid command operation code */
176 	},{
177 	        /* end of list */
178 	}
179 };
180 
181 /* ------------------------------------------------------------------- */
182 
183 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
184 {
185 	int i,errno = 0;
186 
187 	/* Check to see if additional sense information is available */
188 	if (scsi_sense_valid(sshdr) &&
189 	    sshdr->asc != 0) {
190 		for (i = 0; err[i].errno != 0; i++) {
191 			if (err[i].sense == sshdr->sense_key &&
192 			    err[i].asc   == sshdr->asc &&
193 			    err[i].ascq  == sshdr->ascq) {
194 				errno = -err[i].errno;
195 				break;
196 			}
197 		}
198 	}
199 	if (errno == 0)
200 		errno = -EIO;
201 	return errno;
202 }
203 
204 static int
205 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
206 	   void *buffer, unsigned buflength,
207 	   enum dma_data_direction direction)
208 {
209 	int errno, retries = 0, timeout, result;
210 	struct scsi_sense_hdr sshdr;
211 
212 	timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
213 		? timeout_init : timeout_move;
214 
215  retry:
216 	errno = 0;
217 	if (debug) {
218 		dprintk("command: ");
219 		__scsi_print_command(cmd);
220 	}
221 
222         result = scsi_execute_req(ch->device, cmd, direction, buffer,
223 				  buflength, &sshdr, timeout * HZ,
224 				  MAX_RETRIES);
225 
226 	dprintk("result: 0x%x\n",result);
227 	if (driver_byte(result) & DRIVER_SENSE) {
228 		if (debug)
229 			scsi_print_sense_hdr(ch->name, &sshdr);
230 		errno = ch_find_errno(&sshdr);
231 
232 		switch(sshdr.sense_key) {
233 		case UNIT_ATTENTION:
234 			ch->unit_attention = 1;
235 			if (retries++ < 3)
236 				goto retry;
237 			break;
238 		}
239 	}
240 	return errno;
241 }
242 
243 /* ------------------------------------------------------------------------ */
244 
245 static int
246 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
247 {
248 	int i;
249 
250 	for (i = 0; i < CH_TYPES; i++) {
251 		if (elem >= ch->firsts[i]  &&
252 		    elem <  ch->firsts[i] +
253 	            ch->counts[i])
254 			return i+1;
255 	}
256 	return 0;
257 }
258 
259 static int
260 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
261 {
262 	u_char  cmd[12];
263 	u_char  *buffer;
264 	int     result;
265 
266 	buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
267 	if(!buffer)
268 		return -ENOMEM;
269 
270  retry:
271 	memset(cmd,0,sizeof(cmd));
272 	cmd[0] = READ_ELEMENT_STATUS;
273 	cmd[1] = (ch->device->lun << 5) |
274 		(ch->voltags ? 0x10 : 0) |
275 		ch_elem_to_typecode(ch,elem);
276 	cmd[2] = (elem >> 8) & 0xff;
277 	cmd[3] = elem        & 0xff;
278 	cmd[5] = 1;
279 	cmd[9] = 255;
280 	if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
281 		if (((buffer[16] << 8) | buffer[17]) != elem) {
282 			dprintk("asked for element 0x%02x, got 0x%02x\n",
283 				elem,(buffer[16] << 8) | buffer[17]);
284 			kfree(buffer);
285 			return -EIO;
286 		}
287 		memcpy(data,buffer+16,16);
288 	} else {
289 		if (ch->voltags) {
290 			ch->voltags = 0;
291 			vprintk("device has no volume tag support\n");
292 			goto retry;
293 		}
294 		dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
295 	}
296 	kfree(buffer);
297 	return result;
298 }
299 
300 static int
301 ch_init_elem(scsi_changer *ch)
302 {
303 	int err;
304 	u_char cmd[6];
305 
306 	vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
307 	memset(cmd,0,sizeof(cmd));
308 	cmd[0] = INITIALIZE_ELEMENT_STATUS;
309 	cmd[1] = ch->device->lun << 5;
310 	err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
311 	vprintk("... finished\n");
312 	return err;
313 }
314 
315 static int
316 ch_readconfig(scsi_changer *ch)
317 {
318 	u_char  cmd[10], data[16];
319 	u_char  *buffer;
320 	int     result,id,lun,i;
321 	u_int   elem;
322 
323 	buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
324 	if (!buffer)
325 		return -ENOMEM;
326 	memset(buffer,0,512);
327 
328 	memset(cmd,0,sizeof(cmd));
329 	cmd[0] = MODE_SENSE;
330 	cmd[1] = ch->device->lun << 5;
331 	cmd[2] = 0x1d;
332 	cmd[4] = 255;
333 	result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
334 	if (0 != result) {
335 		cmd[1] |= (1<<3);
336 		result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
337 	}
338 	if (0 == result) {
339 		ch->firsts[CHET_MT] =
340 			(buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
341 		ch->counts[CHET_MT] =
342 			(buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
343 		ch->firsts[CHET_ST] =
344 			(buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
345 		ch->counts[CHET_ST] =
346 			(buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
347 		ch->firsts[CHET_IE] =
348 			(buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
349 		ch->counts[CHET_IE] =
350 			(buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
351 		ch->firsts[CHET_DT] =
352 			(buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
353 		ch->counts[CHET_DT] =
354 			(buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
355 		vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
356 			ch->firsts[CHET_MT],
357 			ch->counts[CHET_MT]);
358 		vprintk("type #2 (st): 0x%x+%d [storage]\n",
359 			ch->firsts[CHET_ST],
360 			ch->counts[CHET_ST]);
361 		vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
362 			ch->firsts[CHET_IE],
363 			ch->counts[CHET_IE]);
364 		vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
365 			ch->firsts[CHET_DT],
366 			ch->counts[CHET_DT]);
367 	} else {
368 		vprintk("reading element address assigment page failed!\n");
369 	}
370 
371 	/* vendor specific element types */
372 	for (i = 0; i < 4; i++) {
373 		if (0 == vendor_counts[i])
374 			continue;
375 		if (NULL == vendor_labels[i])
376 			continue;
377 		ch->firsts[CHET_V1+i] = vendor_firsts[i];
378 		ch->counts[CHET_V1+i] = vendor_counts[i];
379 		vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
380 			i+5,i+1,vendor_firsts[i],vendor_counts[i],
381 			vendor_labels[i]);
382 	}
383 
384 	/* look up the devices of the data transfer elements */
385 	ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
386 			 GFP_KERNEL);
387 	for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
388 		id  = -1;
389 		lun = 0;
390 		if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
391 			id  = dt_id[elem];
392 			lun = dt_lun[elem];
393 			vprintk("dt 0x%x: [insmod option] ",
394 				elem+ch->firsts[CHET_DT]);
395 		} else if (0 != ch_read_element_status
396 			   (ch,elem+ch->firsts[CHET_DT],data)) {
397 			vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
398 				elem+ch->firsts[CHET_DT]);
399 		} else {
400 			vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
401 			if (data[6] & 0x80) {
402 				if (verbose)
403 					printk("not this SCSI bus\n");
404 				ch->dt[elem] = NULL;
405 			} else if (0 == (data[6] & 0x30)) {
406 				if (verbose)
407 					printk("ID/LUN unknown\n");
408 				ch->dt[elem] = NULL;
409 			} else {
410 				id  = ch->device->id;
411 				lun = 0;
412 				if (data[6] & 0x20) id  = data[7];
413 				if (data[6] & 0x10) lun = data[6] & 7;
414 			}
415 		}
416 		if (-1 != id) {
417 			if (verbose)
418 				printk("ID %i, LUN %i, ",id,lun);
419 			ch->dt[elem] =
420 				scsi_device_lookup(ch->device->host,
421 						   ch->device->channel,
422 						   id,lun);
423 			if (!ch->dt[elem]) {
424 				/* should not happen */
425 				if (verbose)
426 					printk("Huh? device not found!\n");
427 			} else {
428 				if (verbose)
429 					printk("name: %8.8s %16.16s %4.4s\n",
430 					       ch->dt[elem]->vendor,
431 					       ch->dt[elem]->model,
432 					       ch->dt[elem]->rev);
433 			}
434 		}
435 	}
436 	ch->voltags = 1;
437 	kfree(buffer);
438 
439 	return 0;
440 }
441 
442 /* ------------------------------------------------------------------------ */
443 
444 static int
445 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
446 {
447 	u_char  cmd[10];
448 
449 	dprintk("position: 0x%x\n",elem);
450 	if (0 == trans)
451 		trans = ch->firsts[CHET_MT];
452 	memset(cmd,0,sizeof(cmd));
453 	cmd[0]  = POSITION_TO_ELEMENT;
454 	cmd[1]  = ch->device->lun << 5;
455 	cmd[2]  = (trans >> 8) & 0xff;
456 	cmd[3]  =  trans       & 0xff;
457 	cmd[4]  = (elem  >> 8) & 0xff;
458 	cmd[5]  =  elem        & 0xff;
459 	cmd[8]  = rotate ? 1 : 0;
460 	return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
461 }
462 
463 static int
464 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
465 {
466 	u_char  cmd[12];
467 
468 	dprintk("move: 0x%x => 0x%x\n",src,dest);
469 	if (0 == trans)
470 		trans = ch->firsts[CHET_MT];
471 	memset(cmd,0,sizeof(cmd));
472 	cmd[0]  = MOVE_MEDIUM;
473 	cmd[1]  = ch->device->lun << 5;
474 	cmd[2]  = (trans >> 8) & 0xff;
475 	cmd[3]  =  trans       & 0xff;
476 	cmd[4]  = (src   >> 8) & 0xff;
477 	cmd[5]  =  src         & 0xff;
478 	cmd[6]  = (dest  >> 8) & 0xff;
479 	cmd[7]  =  dest        & 0xff;
480 	cmd[10] = rotate ? 1 : 0;
481 	return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
482 }
483 
484 static int
485 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
486 	    u_int dest1, u_int dest2, int rotate1, int rotate2)
487 {
488 	u_char  cmd[12];
489 
490 	dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
491 		src,dest1,dest2);
492 	if (0 == trans)
493 		trans = ch->firsts[CHET_MT];
494 	memset(cmd,0,sizeof(cmd));
495 	cmd[0]  = EXCHANGE_MEDIUM;
496 	cmd[1]  = ch->device->lun << 5;
497 	cmd[2]  = (trans >> 8) & 0xff;
498 	cmd[3]  =  trans       & 0xff;
499 	cmd[4]  = (src   >> 8) & 0xff;
500 	cmd[5]  =  src         & 0xff;
501 	cmd[6]  = (dest1 >> 8) & 0xff;
502 	cmd[7]  =  dest1       & 0xff;
503 	cmd[8]  = (dest2 >> 8) & 0xff;
504 	cmd[9]  =  dest2       & 0xff;
505 	cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
506 
507 	return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
508 }
509 
510 static void
511 ch_check_voltag(char *tag)
512 {
513 	int i;
514 
515 	for (i = 0; i < 32; i++) {
516 		/* restrict to ascii */
517 		if (tag[i] >= 0x7f || tag[i] < 0x20)
518 			tag[i] = ' ';
519 		/* don't allow search wildcards */
520 		if (tag[i] == '?' ||
521 		    tag[i] == '*')
522 			tag[i] = ' ';
523 	}
524 }
525 
526 static int
527 ch_set_voltag(scsi_changer *ch, u_int elem,
528 	      int alternate, int clear, u_char *tag)
529 {
530 	u_char  cmd[12];
531 	u_char  *buffer;
532 	int result;
533 
534 	buffer = kmalloc(512, GFP_KERNEL);
535 	if (!buffer)
536 		return -ENOMEM;
537 	memset(buffer,0,512);
538 
539 	dprintk("%s %s voltag: 0x%x => \"%s\"\n",
540 		clear     ? "clear"     : "set",
541 		alternate ? "alternate" : "primary",
542 		elem, tag);
543 	memset(cmd,0,sizeof(cmd));
544 	cmd[0]  = SEND_VOLUME_TAG;
545 	cmd[1] = (ch->device->lun << 5) |
546 		ch_elem_to_typecode(ch,elem);
547 	cmd[2] = (elem >> 8) & 0xff;
548 	cmd[3] = elem        & 0xff;
549 	cmd[5] = clear
550 		? (alternate ? 0x0d : 0x0c)
551 		: (alternate ? 0x0b : 0x0a);
552 
553 	cmd[9] = 255;
554 
555 	memcpy(buffer,tag,32);
556 	ch_check_voltag(buffer);
557 
558 	result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
559 	kfree(buffer);
560 	return result;
561 }
562 
563 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
564 {
565 	int retval = 0;
566 	u_char data[16];
567 	unsigned int i;
568 
569 	down(&ch->lock);
570 	for (i = 0; i < ch->counts[type]; i++) {
571 		if (0 != ch_read_element_status
572 		    (ch, ch->firsts[type]+i,data)) {
573 			retval = -EIO;
574 			break;
575 		}
576 		put_user(data[2], dest+i);
577 		if (data[2] & CESTATUS_EXCEPT)
578 			vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
579 				ch->firsts[type]+i,
580 				(int)data[4],(int)data[5]);
581 		retval = ch_read_element_status
582 			(ch, ch->firsts[type]+i,data);
583 		if (0 != retval)
584 			break;
585 	}
586 	up(&ch->lock);
587 	return retval;
588 }
589 
590 /* ------------------------------------------------------------------------ */
591 
592 static int
593 ch_release(struct inode *inode, struct file *file)
594 {
595 	scsi_changer *ch = file->private_data;
596 
597 	scsi_device_put(ch->device);
598 	file->private_data = NULL;
599 	return 0;
600 }
601 
602 static int
603 ch_open(struct inode *inode, struct file *file)
604 {
605 	scsi_changer *tmp, *ch;
606 	int minor = iminor(inode);
607 
608 	spin_lock(&ch_devlist_lock);
609 	ch = NULL;
610 	list_for_each_entry(tmp,&ch_devlist,list) {
611 		if (tmp->minor == minor)
612 			ch = tmp;
613 	}
614 	if (NULL == ch || scsi_device_get(ch->device)) {
615 		spin_unlock(&ch_devlist_lock);
616 		return -ENXIO;
617 	}
618 	spin_unlock(&ch_devlist_lock);
619 
620 	file->private_data = ch;
621 	return 0;
622 }
623 
624 static int
625 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
626 {
627 	if (type >= CH_TYPES  ||  unit >= ch->counts[type])
628 		return -1;
629 	return 0;
630 }
631 
632 static int ch_ioctl(struct inode * inode, struct file * file,
633 		    unsigned int cmd, unsigned long arg)
634 {
635 	scsi_changer *ch = file->private_data;
636 	int retval;
637 	void __user *argp = (void __user *)arg;
638 
639 	switch (cmd) {
640 	case CHIOGPARAMS:
641 	{
642 		struct changer_params params;
643 
644 		params.cp_curpicker = 0;
645 		params.cp_npickers  = ch->counts[CHET_MT];
646 		params.cp_nslots    = ch->counts[CHET_ST];
647 		params.cp_nportals  = ch->counts[CHET_IE];
648 		params.cp_ndrives   = ch->counts[CHET_DT];
649 
650 		if (copy_to_user(argp, &params, sizeof(params)))
651 			return -EFAULT;
652 		return 0;
653 	}
654 	case CHIOGVPARAMS:
655 	{
656 		struct changer_vendor_params vparams;
657 
658 		memset(&vparams,0,sizeof(vparams));
659 		if (ch->counts[CHET_V1]) {
660 			vparams.cvp_n1  = ch->counts[CHET_V1];
661 			strncpy(vparams.cvp_label1,vendor_labels[0],16);
662 		}
663 		if (ch->counts[CHET_V2]) {
664 			vparams.cvp_n2  = ch->counts[CHET_V2];
665 			strncpy(vparams.cvp_label2,vendor_labels[1],16);
666 		}
667 		if (ch->counts[CHET_V3]) {
668 			vparams.cvp_n3  = ch->counts[CHET_V3];
669 			strncpy(vparams.cvp_label3,vendor_labels[2],16);
670 		}
671 		if (ch->counts[CHET_V4]) {
672 			vparams.cvp_n4  = ch->counts[CHET_V4];
673 			strncpy(vparams.cvp_label4,vendor_labels[3],16);
674 		}
675 		if (copy_to_user(argp, &vparams, sizeof(vparams)))
676 			return -EFAULT;
677 		return 0;
678 	}
679 
680 	case CHIOPOSITION:
681 	{
682 		struct changer_position pos;
683 
684 		if (copy_from_user(&pos, argp, sizeof (pos)))
685 			return -EFAULT;
686 
687 		if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
688 			dprintk("CHIOPOSITION: invalid parameter\n");
689 			return -EBADSLT;
690 		}
691 		down(&ch->lock);
692 		retval = ch_position(ch,0,
693 				     ch->firsts[pos.cp_type] + pos.cp_unit,
694 				     pos.cp_flags & CP_INVERT);
695 		up(&ch->lock);
696 		return retval;
697 	}
698 
699 	case CHIOMOVE:
700 	{
701 		struct changer_move mv;
702 
703 		if (copy_from_user(&mv, argp, sizeof (mv)))
704 			return -EFAULT;
705 
706 		if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
707 		    0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
708 			dprintk("CHIOMOVE: invalid parameter\n");
709 			return -EBADSLT;
710 		}
711 
712 		down(&ch->lock);
713 		retval = ch_move(ch,0,
714 				 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
715 				 ch->firsts[mv.cm_totype]   + mv.cm_tounit,
716 				 mv.cm_flags & CM_INVERT);
717 		up(&ch->lock);
718 		return retval;
719 	}
720 
721 	case CHIOEXCHANGE:
722 	{
723 		struct changer_exchange mv;
724 
725 		if (copy_from_user(&mv, argp, sizeof (mv)))
726 			return -EFAULT;
727 
728 		if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
729 		    0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
730 		    0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
731 			dprintk("CHIOEXCHANGE: invalid parameter\n");
732 			return -EBADSLT;
733 		}
734 
735 		down(&ch->lock);
736 		retval = ch_exchange
737 			(ch,0,
738 			 ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
739 			 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
740 			 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
741 			 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
742 		up(&ch->lock);
743 		return retval;
744 	}
745 
746 	case CHIOGSTATUS:
747 	{
748 		struct changer_element_status ces;
749 
750 		if (copy_from_user(&ces, argp, sizeof (ces)))
751 			return -EFAULT;
752 		if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
753 			return -EINVAL;
754 
755 		return ch_gstatus(ch, ces.ces_type, ces.ces_data);
756 	}
757 
758 	case CHIOGELEM:
759 	{
760 		struct changer_get_element cge;
761 		u_char  cmd[12];
762 		u_char  *buffer;
763 		unsigned int elem;
764 		int     result,i;
765 
766 		if (copy_from_user(&cge, argp, sizeof (cge)))
767 			return -EFAULT;
768 
769 		if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
770 			return -EINVAL;
771 		elem = ch->firsts[cge.cge_type] + cge.cge_unit;
772 
773 		buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
774 		if (!buffer)
775 			return -ENOMEM;
776 		down(&ch->lock);
777 
778 	voltag_retry:
779 		memset(cmd,0,sizeof(cmd));
780 		cmd[0] = READ_ELEMENT_STATUS;
781 		cmd[1] = (ch->device->lun << 5) |
782 			(ch->voltags ? 0x10 : 0) |
783 			ch_elem_to_typecode(ch,elem);
784 		cmd[2] = (elem >> 8) & 0xff;
785 		cmd[3] = elem        & 0xff;
786 		cmd[5] = 1;
787 		cmd[9] = 255;
788 
789 		if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
790 			cge.cge_status = buffer[18];
791 			cge.cge_flags = 0;
792 			if (buffer[18] & CESTATUS_EXCEPT) {
793 				cge.cge_errno = EIO;
794 			}
795 			if (buffer[25] & 0x80) {
796 				cge.cge_flags |= CGE_SRC;
797 				if (buffer[25] & 0x40)
798 					cge.cge_flags |= CGE_INVERT;
799 				elem = (buffer[26]<<8) | buffer[27];
800 				for (i = 0; i < 4; i++) {
801 					if (elem >= ch->firsts[i] &&
802 					    elem <  ch->firsts[i] + ch->counts[i]) {
803 						cge.cge_srctype = i;
804 						cge.cge_srcunit = elem-ch->firsts[i];
805 					}
806 				}
807 			}
808 			if ((buffer[22] & 0x30) == 0x30) {
809 				cge.cge_flags |= CGE_IDLUN;
810 				cge.cge_id  = buffer[23];
811 				cge.cge_lun = buffer[22] & 7;
812 			}
813 			if (buffer[9] & 0x80) {
814 				cge.cge_flags |= CGE_PVOLTAG;
815 				memcpy(cge.cge_pvoltag,buffer+28,36);
816 			}
817 			if (buffer[9] & 0x40) {
818 				cge.cge_flags |= CGE_AVOLTAG;
819 				memcpy(cge.cge_avoltag,buffer+64,36);
820 			}
821 		} else if (ch->voltags) {
822 			ch->voltags = 0;
823 			vprintk("device has no volume tag support\n");
824 			goto voltag_retry;
825 		}
826 		kfree(buffer);
827 		up(&ch->lock);
828 
829 		if (copy_to_user(argp, &cge, sizeof (cge)))
830 			return -EFAULT;
831 		return result;
832 	}
833 
834 	case CHIOINITELEM:
835 	{
836 		down(&ch->lock);
837 		retval = ch_init_elem(ch);
838 		up(&ch->lock);
839 		return retval;
840 	}
841 
842 	case CHIOSVOLTAG:
843 	{
844 		struct changer_set_voltag csv;
845 		int elem;
846 
847 		if (copy_from_user(&csv, argp, sizeof(csv)))
848 			return -EFAULT;
849 
850 		if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
851 			dprintk("CHIOSVOLTAG: invalid parameter\n");
852 			return -EBADSLT;
853 		}
854 		elem = ch->firsts[csv.csv_type] + csv.csv_unit;
855 		down(&ch->lock);
856 		retval = ch_set_voltag(ch, elem,
857 				       csv.csv_flags & CSV_AVOLTAG,
858 				       csv.csv_flags & CSV_CLEARTAG,
859 				       csv.csv_voltag);
860 		up(&ch->lock);
861 		return retval;
862 	}
863 
864 	default:
865 		return scsi_ioctl(ch->device, cmd, argp);
866 
867 	}
868 }
869 
870 #ifdef CONFIG_COMPAT
871 
872 struct changer_element_status32 {
873 	int		ces_type;
874 	compat_uptr_t	ces_data;
875 };
876 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
877 
878 static long ch_ioctl_compat(struct file * file,
879 			    unsigned int cmd, unsigned long arg)
880 {
881 	scsi_changer *ch = file->private_data;
882 
883 	switch (cmd) {
884 	case CHIOGPARAMS:
885 	case CHIOGVPARAMS:
886 	case CHIOPOSITION:
887 	case CHIOMOVE:
888 	case CHIOEXCHANGE:
889 	case CHIOGELEM:
890 	case CHIOINITELEM:
891 	case CHIOSVOLTAG:
892 		/* compatible */
893 		return ch_ioctl(NULL /* inode, unused */,
894 				file, cmd, arg);
895 	case CHIOGSTATUS32:
896 	{
897 		struct changer_element_status32 ces32;
898 		unsigned char __user *data;
899 
900 		if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
901 			return -EFAULT;
902 		if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
903 			return -EINVAL;
904 
905 		data = compat_ptr(ces32.ces_data);
906 		return ch_gstatus(ch, ces32.ces_type, data);
907 	}
908 	default:
909 		// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
910 		return -ENOIOCTLCMD;
911 
912 	}
913 }
914 #endif
915 
916 /* ------------------------------------------------------------------------ */
917 
918 static int ch_probe(struct device *dev)
919 {
920 	struct scsi_device *sd = to_scsi_device(dev);
921 	scsi_changer *ch;
922 
923 	if (sd->type != TYPE_MEDIUM_CHANGER)
924 		return -ENODEV;
925 
926 	ch = kmalloc(sizeof(*ch), GFP_KERNEL);
927 	if (NULL == ch)
928 		return -ENOMEM;
929 
930 	memset(ch,0,sizeof(*ch));
931 	ch->minor = ch_devcount;
932 	sprintf(ch->name,"ch%d",ch->minor);
933 	init_MUTEX(&ch->lock);
934 	ch->device = sd;
935 	ch_readconfig(ch);
936 	if (init)
937 		ch_init_elem(ch);
938 
939 	class_device_create(ch_sysfs_class, NULL,
940 			    MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
941 			    dev, "s%s", ch->name);
942 
943 	sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
944 
945 	spin_lock(&ch_devlist_lock);
946 	list_add_tail(&ch->list,&ch_devlist);
947 	ch_devcount++;
948 	spin_unlock(&ch_devlist_lock);
949 	return 0;
950 }
951 
952 static int ch_remove(struct device *dev)
953 {
954 	struct scsi_device *sd = to_scsi_device(dev);
955 	scsi_changer *tmp, *ch;
956 
957 	spin_lock(&ch_devlist_lock);
958 	ch = NULL;
959 	list_for_each_entry(tmp,&ch_devlist,list) {
960 		if (tmp->device == sd)
961 			ch = tmp;
962 	}
963 	BUG_ON(NULL == ch);
964 	list_del(&ch->list);
965 	spin_unlock(&ch_devlist_lock);
966 
967 	class_device_destroy(ch_sysfs_class,
968 			     MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
969 	kfree(ch->dt);
970 	kfree(ch);
971 	ch_devcount--;
972 	return 0;
973 }
974 
975 static int __init init_ch_module(void)
976 {
977 	int rc;
978 
979 	printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
980         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
981         if (IS_ERR(ch_sysfs_class)) {
982 		rc = PTR_ERR(ch_sysfs_class);
983 		return rc;
984         }
985 	rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
986 	if (rc < 0) {
987 		printk("Unable to get major %d for SCSI-Changer\n",
988 		       SCSI_CHANGER_MAJOR);
989 		goto fail1;
990 	}
991 	rc = scsi_register_driver(&ch_template.gendrv);
992 	if (rc < 0)
993 		goto fail2;
994 	return 0;
995 
996  fail2:
997 	unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
998  fail1:
999 	class_destroy(ch_sysfs_class);
1000 	return rc;
1001 }
1002 
1003 static void __exit exit_ch_module(void)
1004 {
1005 	scsi_unregister_driver(&ch_template.gendrv);
1006 	unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1007 	class_destroy(ch_sysfs_class);
1008 }
1009 
1010 module_init(init_ch_module);
1011 module_exit(exit_ch_module);
1012 
1013 /*
1014  * Local variables:
1015  * c-basic-offset: 8
1016  * End:
1017  */
1018