[SCSI] Mark some core scsi data structures const
[linux-2.6.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/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 const 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 const 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  */