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