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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
[karo-tx-linux.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/module.h>
11 #include <linux/init.h>
12 #include <linux/fs.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/major.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/interrupt.h>
19 #include <linux/blkdev.h>
20 #include <linux/completion.h>
21 #include <linux/compat.h>
22 #include <linux/chio.h>                 /* here are all the ioctls */
23 #include <linux/mutex.h>
24 #include <linux/idr.h>
25 #include <linux/slab.h>
26
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_cmnd.h>
29 #include <scsi/scsi_driver.h>
30 #include <scsi/scsi_ioctl.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_dbg.h>
35
36 #define CH_DT_MAX       16
37 #define CH_TYPES        8
38 #define CH_MAX_DEVS     128
39
40 MODULE_DESCRIPTION("device driver for scsi media changer devices");
41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42 MODULE_LICENSE("GPL");
43 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
45
46 static DEFINE_MUTEX(ch_mutex);
47 static int init = 1;
48 module_param(init, int, 0444);
49 MODULE_PARM_DESC(init, \
50     "initialize element status on driver load (default: on)");
51
52 static int timeout_move = 300;
53 module_param(timeout_move, int, 0644);
54 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55                  "(default: 300 seconds)");
56
57 static int timeout_init = 3600;
58 module_param(timeout_init, int, 0644);
59 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60                  "(default: 3600 seconds)");
61
62 static int verbose = 1;
63 module_param(verbose, int, 0644);
64 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66 static int debug = 0;
67 module_param(debug, int, 0644);
68 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69                  "detailed sense codes on scsi errors (default: off)");
70
71 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72 static int dt_lun[CH_DT_MAX];
73 module_param_array(dt_id,  int, NULL, 0444);
74 module_param_array(dt_lun, int, NULL, 0444);
75
76 /* tell the driver about vendor-specific slots */
77 static int vendor_firsts[CH_TYPES-4];
78 static int vendor_counts[CH_TYPES-4];
79 module_param_array(vendor_firsts, int, NULL, 0444);
80 module_param_array(vendor_counts, int, NULL, 0444);
81
82 static const char * vendor_labels[CH_TYPES-4] = {
83         "v0", "v1", "v2", "v3"
84 };
85 // module_param_string_array(vendor_labels, NULL, 0444);
86
87 #define ch_printk(prefix, ch, fmt, a...) \
88         sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
89
90 #define DPRINTK(fmt, arg...)                                            \
91 do {                                                                    \
92         if (debug)                                                      \
93                 ch_printk(KERN_DEBUG, ch, fmt, ##arg);                  \
94 } while (0)
95 #define VPRINTK(level, fmt, arg...)                                     \
96 do {                                                                    \
97         if (verbose)                                                    \
98                 ch_printk(level, ch, fmt, ##arg);                       \
99 } while (0)
100
101 /* ------------------------------------------------------------------- */
102
103 #define MAX_RETRIES   1
104
105 static struct class * ch_sysfs_class;
106
107 typedef struct {
108         struct list_head    list;
109         int                 minor;
110         char                name[8];
111         struct scsi_device  *device;
112         struct scsi_device  **dt;        /* ptrs to data transfer elements */
113         u_int               firsts[CH_TYPES];
114         u_int               counts[CH_TYPES];
115         u_int               unit_attention;
116         u_int               voltags;
117         struct mutex        lock;
118 } scsi_changer;
119
120 static DEFINE_IDR(ch_index_idr);
121 static DEFINE_SPINLOCK(ch_index_lock);
122
123 static const struct {
124         unsigned char  sense;
125         unsigned char  asc;
126         unsigned char  ascq;
127         int            errno;
128 } ch_err[] = {
129 /* Just filled in what looks right. Hav'nt checked any standard paper for
130    these errno assignments, so they may be wrong... */
131         {
132                 .sense  = ILLEGAL_REQUEST,
133                 .asc    = 0x21,
134                 .ascq   = 0x01,
135                 .errno  = EBADSLT, /* Invalid element address */
136         },{
137                 .sense  = ILLEGAL_REQUEST,
138                 .asc    = 0x28,
139                 .ascq   = 0x01,
140                 .errno  = EBADE,   /* Import or export element accessed */
141         },{
142                 .sense  = ILLEGAL_REQUEST,
143                 .asc    = 0x3B,
144                 .ascq   = 0x0D,
145                 .errno  = EXFULL,  /* Medium destination element full */
146         },{
147                 .sense  = ILLEGAL_REQUEST,
148                 .asc    = 0x3B,
149                 .ascq   = 0x0E,
150                 .errno  = EBADE,   /* Medium source element empty */
151         },{
152                 .sense  = ILLEGAL_REQUEST,
153                 .asc    = 0x20,
154                 .ascq   = 0x00,
155                 .errno  = EBADRQC, /* Invalid command operation code */
156         },{
157                 /* end of list */
158         }
159 };
160
161 /* ------------------------------------------------------------------- */
162
163 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
164 {
165         int i,errno = 0;
166
167         /* Check to see if additional sense information is available */
168         if (scsi_sense_valid(sshdr) &&
169             sshdr->asc != 0) {
170                 for (i = 0; ch_err[i].errno != 0; i++) {
171                         if (ch_err[i].sense == sshdr->sense_key &&
172                             ch_err[i].asc   == sshdr->asc &&
173                             ch_err[i].ascq  == sshdr->ascq) {
174                                 errno = -ch_err[i].errno;
175                                 break;
176                         }
177                 }
178         }
179         if (errno == 0)
180                 errno = -EIO;
181         return errno;
182 }
183
184 static int
185 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
186            void *buffer, unsigned buflength,
187            enum dma_data_direction direction)
188 {
189         int errno, retries = 0, timeout, result;
190         struct scsi_sense_hdr sshdr;
191
192         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
193                 ? timeout_init : timeout_move;
194
195  retry:
196         errno = 0;
197         result = scsi_execute_req(ch->device, cmd, direction, buffer,
198                                   buflength, &sshdr, timeout * HZ,
199                                   MAX_RETRIES, NULL);
200
201         if (driver_byte(result) & DRIVER_SENSE) {
202                 if (debug)
203                         scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
204                 errno = ch_find_errno(&sshdr);
205
206                 switch(sshdr.sense_key) {
207                 case UNIT_ATTENTION:
208                         ch->unit_attention = 1;
209                         if (retries++ < 3)
210                                 goto retry;
211                         break;
212                 }
213         }
214         return errno;
215 }
216
217 /* ------------------------------------------------------------------------ */
218
219 static int
220 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
221 {
222         int i;
223
224         for (i = 0; i < CH_TYPES; i++) {
225                 if (elem >= ch->firsts[i]  &&
226                     elem <  ch->firsts[i] +
227                     ch->counts[i])
228                         return i+1;
229         }
230         return 0;
231 }
232
233 static int
234 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
235 {
236         u_char  cmd[12];
237         u_char  *buffer;
238         int     result;
239
240         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
241         if(!buffer)
242                 return -ENOMEM;
243
244  retry:
245         memset(cmd,0,sizeof(cmd));
246         cmd[0] = READ_ELEMENT_STATUS;
247         cmd[1] = ((ch->device->lun & 0x7) << 5) |
248                 (ch->voltags ? 0x10 : 0) |
249                 ch_elem_to_typecode(ch,elem);
250         cmd[2] = (elem >> 8) & 0xff;
251         cmd[3] = elem        & 0xff;
252         cmd[5] = 1;
253         cmd[9] = 255;
254         if (0 == (result = ch_do_scsi(ch, cmd, 12,
255                                       buffer, 256, DMA_FROM_DEVICE))) {
256                 if (((buffer[16] << 8) | buffer[17]) != elem) {
257                         DPRINTK("asked for element 0x%02x, got 0x%02x\n",
258                                 elem,(buffer[16] << 8) | buffer[17]);
259                         kfree(buffer);
260                         return -EIO;
261                 }
262                 memcpy(data,buffer+16,16);
263         } else {
264                 if (ch->voltags) {
265                         ch->voltags = 0;
266                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
267                         goto retry;
268                 }
269                 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
270         }
271         kfree(buffer);
272         return result;
273 }
274
275 static int
276 ch_init_elem(scsi_changer *ch)
277 {
278         int err;
279         u_char cmd[6];
280
281         VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
282         memset(cmd,0,sizeof(cmd));
283         cmd[0] = INITIALIZE_ELEMENT_STATUS;
284         cmd[1] = (ch->device->lun & 0x7) << 5;
285         err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
286         VPRINTK(KERN_INFO, "... finished\n");
287         return err;
288 }
289
290 static int
291 ch_readconfig(scsi_changer *ch)
292 {
293         u_char  cmd[10], data[16];
294         u_char  *buffer;
295         int     result,id,lun,i;
296         u_int   elem;
297
298         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
299         if (!buffer)
300                 return -ENOMEM;
301
302         memset(cmd,0,sizeof(cmd));
303         cmd[0] = MODE_SENSE;
304         cmd[1] = (ch->device->lun & 0x7) << 5;
305         cmd[2] = 0x1d;
306         cmd[4] = 255;
307         result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
308         if (0 != result) {
309                 cmd[1] |= (1<<3);
310                 result  = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
311         }
312         if (0 == result) {
313                 ch->firsts[CHET_MT] =
314                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
315                 ch->counts[CHET_MT] =
316                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
317                 ch->firsts[CHET_ST] =
318                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
319                 ch->counts[CHET_ST] =
320                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
321                 ch->firsts[CHET_IE] =
322                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
323                 ch->counts[CHET_IE] =
324                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
325                 ch->firsts[CHET_DT] =
326                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
327                 ch->counts[CHET_DT] =
328                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
329                 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
330                         ch->firsts[CHET_MT],
331                         ch->counts[CHET_MT]);
332                 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
333                         ch->firsts[CHET_ST],
334                         ch->counts[CHET_ST]);
335                 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
336                         ch->firsts[CHET_IE],
337                         ch->counts[CHET_IE]);
338                 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
339                         ch->firsts[CHET_DT],
340                         ch->counts[CHET_DT]);
341         } else {
342                 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
343         }
344
345         /* vendor specific element types */
346         for (i = 0; i < 4; i++) {
347                 if (0 == vendor_counts[i])
348                         continue;
349                 if (NULL == vendor_labels[i])
350                         continue;
351                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
352                 ch->counts[CHET_V1+i] = vendor_counts[i];
353                 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
354                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
355                         vendor_labels[i]);
356         }
357
358         /* look up the devices of the data transfer elements */
359         ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
360                          GFP_KERNEL);
361
362         if (!ch->dt) {
363                 kfree(buffer);
364                 return -ENOMEM;
365         }
366
367         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
368                 id  = -1;
369                 lun = 0;
370                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
371                         id  = dt_id[elem];
372                         lun = dt_lun[elem];
373                         VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
374                                 elem+ch->firsts[CHET_DT]);
375                 } else if (0 != ch_read_element_status
376                            (ch,elem+ch->firsts[CHET_DT],data)) {
377                         VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
378                                 elem+ch->firsts[CHET_DT]);
379                 } else {
380                         VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
381                         if (data[6] & 0x80) {
382                                 VPRINTK(KERN_CONT, "not this SCSI bus\n");
383                                 ch->dt[elem] = NULL;
384                         } else if (0 == (data[6] & 0x30)) {
385                                 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
386                                 ch->dt[elem] = NULL;
387                         } else {
388                                 id  = ch->device->id;
389                                 lun = 0;
390                                 if (data[6] & 0x20) id  = data[7];
391                                 if (data[6] & 0x10) lun = data[6] & 7;
392                         }
393                 }
394                 if (-1 != id) {
395                         VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
396                         ch->dt[elem] =
397                                 scsi_device_lookup(ch->device->host,
398                                                    ch->device->channel,
399                                                    id,lun);
400                         if (!ch->dt[elem]) {
401                                 /* should not happen */
402                                 VPRINTK(KERN_CONT, "Huh? device not found!\n");
403                         } else {
404                                 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
405                                         ch->dt[elem]->vendor,
406                                         ch->dt[elem]->model,
407                                         ch->dt[elem]->rev);
408                         }
409                 }
410         }
411         ch->voltags = 1;
412         kfree(buffer);
413
414         return 0;
415 }
416
417 /* ------------------------------------------------------------------------ */
418
419 static int
420 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
421 {
422         u_char  cmd[10];
423
424         DPRINTK("position: 0x%x\n",elem);
425         if (0 == trans)
426                 trans = ch->firsts[CHET_MT];
427         memset(cmd,0,sizeof(cmd));
428         cmd[0]  = POSITION_TO_ELEMENT;
429         cmd[1]  = (ch->device->lun & 0x7) << 5;
430         cmd[2]  = (trans >> 8) & 0xff;
431         cmd[3]  =  trans       & 0xff;
432         cmd[4]  = (elem  >> 8) & 0xff;
433         cmd[5]  =  elem        & 0xff;
434         cmd[8]  = rotate ? 1 : 0;
435         return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
436 }
437
438 static int
439 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
440 {
441         u_char  cmd[12];
442
443         DPRINTK("move: 0x%x => 0x%x\n",src,dest);
444         if (0 == trans)
445                 trans = ch->firsts[CHET_MT];
446         memset(cmd,0,sizeof(cmd));
447         cmd[0]  = MOVE_MEDIUM;
448         cmd[1]  = (ch->device->lun & 0x7) << 5;
449         cmd[2]  = (trans >> 8) & 0xff;
450         cmd[3]  =  trans       & 0xff;
451         cmd[4]  = (src   >> 8) & 0xff;
452         cmd[5]  =  src         & 0xff;
453         cmd[6]  = (dest  >> 8) & 0xff;
454         cmd[7]  =  dest        & 0xff;
455         cmd[10] = rotate ? 1 : 0;
456         return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
457 }
458
459 static int
460 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
461             u_int dest1, u_int dest2, int rotate1, int rotate2)
462 {
463         u_char  cmd[12];
464
465         DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
466                 src,dest1,dest2);
467         if (0 == trans)
468                 trans = ch->firsts[CHET_MT];
469         memset(cmd,0,sizeof(cmd));
470         cmd[0]  = EXCHANGE_MEDIUM;
471         cmd[1]  = (ch->device->lun & 0x7) << 5;
472         cmd[2]  = (trans >> 8) & 0xff;
473         cmd[3]  =  trans       & 0xff;
474         cmd[4]  = (src   >> 8) & 0xff;
475         cmd[5]  =  src         & 0xff;
476         cmd[6]  = (dest1 >> 8) & 0xff;
477         cmd[7]  =  dest1       & 0xff;
478         cmd[8]  = (dest2 >> 8) & 0xff;
479         cmd[9]  =  dest2       & 0xff;
480         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
481
482         return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
483 }
484
485 static void
486 ch_check_voltag(char *tag)
487 {
488         int i;
489
490         for (i = 0; i < 32; i++) {
491                 /* restrict to ascii */
492                 if (tag[i] >= 0x7f || tag[i] < 0x20)
493                         tag[i] = ' ';
494                 /* don't allow search wildcards */
495                 if (tag[i] == '?' ||
496                     tag[i] == '*')
497                         tag[i] = ' ';
498         }
499 }
500
501 static int
502 ch_set_voltag(scsi_changer *ch, u_int elem,
503               int alternate, int clear, u_char *tag)
504 {
505         u_char  cmd[12];
506         u_char  *buffer;
507         int result;
508
509         buffer = kzalloc(512, GFP_KERNEL);
510         if (!buffer)
511                 return -ENOMEM;
512
513         DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
514                 clear     ? "clear"     : "set",
515                 alternate ? "alternate" : "primary",
516                 elem, tag);
517         memset(cmd,0,sizeof(cmd));
518         cmd[0]  = SEND_VOLUME_TAG;
519         cmd[1] = ((ch->device->lun & 0x7) << 5) |
520                 ch_elem_to_typecode(ch,elem);
521         cmd[2] = (elem >> 8) & 0xff;
522         cmd[3] = elem        & 0xff;
523         cmd[5] = clear
524                 ? (alternate ? 0x0d : 0x0c)
525                 : (alternate ? 0x0b : 0x0a);
526
527         cmd[9] = 255;
528
529         memcpy(buffer,tag,32);
530         ch_check_voltag(buffer);
531
532         result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
533         kfree(buffer);
534         return result;
535 }
536
537 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
538 {
539         int retval = 0;
540         u_char data[16];
541         unsigned int i;
542
543         mutex_lock(&ch->lock);
544         for (i = 0; i < ch->counts[type]; i++) {
545                 if (0 != ch_read_element_status
546                     (ch, ch->firsts[type]+i,data)) {
547                         retval = -EIO;
548                         break;
549                 }
550                 put_user(data[2], dest+i);
551                 if (data[2] & CESTATUS_EXCEPT)
552                         VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
553                                 ch->firsts[type]+i,
554                                 (int)data[4],(int)data[5]);
555                 retval = ch_read_element_status
556                         (ch, ch->firsts[type]+i,data);
557                 if (0 != retval)
558                         break;
559         }
560         mutex_unlock(&ch->lock);
561         return retval;
562 }
563
564 /* ------------------------------------------------------------------------ */
565
566 static int
567 ch_release(struct inode *inode, struct file *file)
568 {
569         scsi_changer *ch = file->private_data;
570
571         scsi_device_put(ch->device);
572         file->private_data = NULL;
573         return 0;
574 }
575
576 static int
577 ch_open(struct inode *inode, struct file *file)
578 {
579         scsi_changer *ch;
580         int minor = iminor(inode);
581
582         mutex_lock(&ch_mutex);
583         spin_lock(&ch_index_lock);
584         ch = idr_find(&ch_index_idr, minor);
585
586         if (NULL == ch || scsi_device_get(ch->device)) {
587                 spin_unlock(&ch_index_lock);
588                 mutex_unlock(&ch_mutex);
589                 return -ENXIO;
590         }
591         spin_unlock(&ch_index_lock);
592
593         file->private_data = ch;
594         mutex_unlock(&ch_mutex);
595         return 0;
596 }
597
598 static int
599 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
600 {
601         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
602                 return -1;
603         return 0;
604 }
605
606 static long ch_ioctl(struct file *file,
607                     unsigned int cmd, unsigned long arg)
608 {
609         scsi_changer *ch = file->private_data;
610         int retval;
611         void __user *argp = (void __user *)arg;
612
613         retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
614                         file->f_flags & O_NDELAY);
615         if (retval)
616                 return retval;
617
618         switch (cmd) {
619         case CHIOGPARAMS:
620         {
621                 struct changer_params params;
622
623                 params.cp_curpicker = 0;
624                 params.cp_npickers  = ch->counts[CHET_MT];
625                 params.cp_nslots    = ch->counts[CHET_ST];
626                 params.cp_nportals  = ch->counts[CHET_IE];
627                 params.cp_ndrives   = ch->counts[CHET_DT];
628
629                 if (copy_to_user(argp, &params, sizeof(params)))
630                         return -EFAULT;
631                 return 0;
632         }
633         case CHIOGVPARAMS:
634         {
635                 struct changer_vendor_params vparams;
636
637                 memset(&vparams,0,sizeof(vparams));
638                 if (ch->counts[CHET_V1]) {
639                         vparams.cvp_n1  = ch->counts[CHET_V1];
640                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
641                 }
642                 if (ch->counts[CHET_V2]) {
643                         vparams.cvp_n2  = ch->counts[CHET_V2];
644                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
645                 }
646                 if (ch->counts[CHET_V3]) {
647                         vparams.cvp_n3  = ch->counts[CHET_V3];
648                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
649                 }
650                 if (ch->counts[CHET_V4]) {
651                         vparams.cvp_n4  = ch->counts[CHET_V4];
652                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
653                 }
654                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
655                         return -EFAULT;
656                 return 0;
657         }
658
659         case CHIOPOSITION:
660         {
661                 struct changer_position pos;
662
663                 if (copy_from_user(&pos, argp, sizeof (pos)))
664                         return -EFAULT;
665
666                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
667                         DPRINTK("CHIOPOSITION: invalid parameter\n");
668                         return -EBADSLT;
669                 }
670                 mutex_lock(&ch->lock);
671                 retval = ch_position(ch,0,
672                                      ch->firsts[pos.cp_type] + pos.cp_unit,
673                                      pos.cp_flags & CP_INVERT);
674                 mutex_unlock(&ch->lock);
675                 return retval;
676         }
677
678         case CHIOMOVE:
679         {
680                 struct changer_move mv;
681
682                 if (copy_from_user(&mv, argp, sizeof (mv)))
683                         return -EFAULT;
684
685                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
686                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
687                         DPRINTK("CHIOMOVE: invalid parameter\n");
688                         return -EBADSLT;
689                 }
690
691                 mutex_lock(&ch->lock);
692                 retval = ch_move(ch,0,
693                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
694                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
695                                  mv.cm_flags & CM_INVERT);
696                 mutex_unlock(&ch->lock);
697                 return retval;
698         }
699
700         case CHIOEXCHANGE:
701         {
702                 struct changer_exchange mv;
703
704                 if (copy_from_user(&mv, argp, sizeof (mv)))
705                         return -EFAULT;
706
707                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
708                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
709                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
710                         DPRINTK("CHIOEXCHANGE: invalid parameter\n");
711                         return -EBADSLT;
712                 }
713
714                 mutex_lock(&ch->lock);
715                 retval = ch_exchange
716                         (ch,0,
717                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
718                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
719                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
720                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
721                 mutex_unlock(&ch->lock);
722                 return retval;
723         }
724
725         case CHIOGSTATUS:
726         {
727                 struct changer_element_status ces;
728
729                 if (copy_from_user(&ces, argp, sizeof (ces)))
730                         return -EFAULT;
731                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
732                         return -EINVAL;
733
734                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
735         }
736
737         case CHIOGELEM:
738         {
739                 struct changer_get_element cge;
740                 u_char ch_cmd[12];
741                 u_char *buffer;
742                 unsigned int elem;
743                 int     result,i;
744
745                 if (copy_from_user(&cge, argp, sizeof (cge)))
746                         return -EFAULT;
747
748                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
749                         return -EINVAL;
750                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
751
752                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
753                 if (!buffer)
754                         return -ENOMEM;
755                 mutex_lock(&ch->lock);
756
757         voltag_retry:
758                 memset(ch_cmd, 0, sizeof(ch_cmd));
759                 ch_cmd[0] = READ_ELEMENT_STATUS;
760                 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
761                         (ch->voltags ? 0x10 : 0) |
762                         ch_elem_to_typecode(ch,elem);
763                 ch_cmd[2] = (elem >> 8) & 0xff;
764                 ch_cmd[3] = elem        & 0xff;
765                 ch_cmd[5] = 1;
766                 ch_cmd[9] = 255;
767
768                 result = ch_do_scsi(ch, ch_cmd, 12,
769                                     buffer, 256, DMA_FROM_DEVICE);
770                 if (!result) {
771                         cge.cge_status = buffer[18];
772                         cge.cge_flags = 0;
773                         if (buffer[18] & CESTATUS_EXCEPT) {
774                                 cge.cge_errno = EIO;
775                         }
776                         if (buffer[25] & 0x80) {
777                                 cge.cge_flags |= CGE_SRC;
778                                 if (buffer[25] & 0x40)
779                                         cge.cge_flags |= CGE_INVERT;
780                                 elem = (buffer[26]<<8) | buffer[27];
781                                 for (i = 0; i < 4; i++) {
782                                         if (elem >= ch->firsts[i] &&
783                                             elem <  ch->firsts[i] + ch->counts[i]) {
784                                                 cge.cge_srctype = i;
785                                                 cge.cge_srcunit = elem-ch->firsts[i];
786                                         }
787                                 }
788                         }
789                         if ((buffer[22] & 0x30) == 0x30) {
790                                 cge.cge_flags |= CGE_IDLUN;
791                                 cge.cge_id  = buffer[23];
792                                 cge.cge_lun = buffer[22] & 7;
793                         }
794                         if (buffer[9] & 0x80) {
795                                 cge.cge_flags |= CGE_PVOLTAG;
796                                 memcpy(cge.cge_pvoltag,buffer+28,36);
797                         }
798                         if (buffer[9] & 0x40) {
799                                 cge.cge_flags |= CGE_AVOLTAG;
800                                 memcpy(cge.cge_avoltag,buffer+64,36);
801                         }
802                 } else if (ch->voltags) {
803                         ch->voltags = 0;
804                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
805                         goto voltag_retry;
806                 }
807                 kfree(buffer);
808                 mutex_unlock(&ch->lock);
809
810                 if (copy_to_user(argp, &cge, sizeof (cge)))
811                         return -EFAULT;
812                 return result;
813         }
814
815         case CHIOINITELEM:
816         {
817                 mutex_lock(&ch->lock);
818                 retval = ch_init_elem(ch);
819                 mutex_unlock(&ch->lock);
820                 return retval;
821         }
822
823         case CHIOSVOLTAG:
824         {
825                 struct changer_set_voltag csv;
826                 int elem;
827
828                 if (copy_from_user(&csv, argp, sizeof(csv)))
829                         return -EFAULT;
830
831                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
832                         DPRINTK("CHIOSVOLTAG: invalid parameter\n");
833                         return -EBADSLT;
834                 }
835                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
836                 mutex_lock(&ch->lock);
837                 retval = ch_set_voltag(ch, elem,
838                                        csv.csv_flags & CSV_AVOLTAG,
839                                        csv.csv_flags & CSV_CLEARTAG,
840                                        csv.csv_voltag);
841                 mutex_unlock(&ch->lock);
842                 return retval;
843         }
844
845         default:
846                 return scsi_ioctl(ch->device, cmd, argp);
847
848         }
849 }
850
851 #ifdef CONFIG_COMPAT
852
853 struct changer_element_status32 {
854         int             ces_type;
855         compat_uptr_t   ces_data;
856 };
857 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
858
859 static long ch_ioctl_compat(struct file * file,
860                             unsigned int cmd, unsigned long arg)
861 {
862         scsi_changer *ch = file->private_data;
863
864         switch (cmd) {
865         case CHIOGPARAMS:
866         case CHIOGVPARAMS:
867         case CHIOPOSITION:
868         case CHIOMOVE:
869         case CHIOEXCHANGE:
870         case CHIOGELEM:
871         case CHIOINITELEM:
872         case CHIOSVOLTAG:
873                 /* compatible */
874                 return ch_ioctl(file, cmd, arg);
875         case CHIOGSTATUS32:
876         {
877                 struct changer_element_status32 ces32;
878                 unsigned char __user *data;
879
880                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
881                         return -EFAULT;
882                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
883                         return -EINVAL;
884
885                 data = compat_ptr(ces32.ces_data);
886                 return ch_gstatus(ch, ces32.ces_type, data);
887         }
888         default:
889                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
890                 return -ENOIOCTLCMD;
891
892         }
893 }
894 #endif
895
896 /* ------------------------------------------------------------------------ */
897
898 static int ch_probe(struct device *dev)
899 {
900         struct scsi_device *sd = to_scsi_device(dev);
901         struct device *class_dev;
902         int ret;
903         scsi_changer *ch;
904
905         if (sd->type != TYPE_MEDIUM_CHANGER)
906                 return -ENODEV;
907
908         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
909         if (NULL == ch)
910                 return -ENOMEM;
911
912         idr_preload(GFP_KERNEL);
913         spin_lock(&ch_index_lock);
914         ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
915         spin_unlock(&ch_index_lock);
916         idr_preload_end();
917
918         if (ret < 0) {
919                 if (ret == -ENOSPC)
920                         ret = -ENODEV;
921                 goto free_ch;
922         }
923
924         ch->minor = ret;
925         sprintf(ch->name,"ch%d",ch->minor);
926
927         class_dev = device_create(ch_sysfs_class, dev,
928                                   MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
929                                   "s%s", ch->name);
930         if (IS_ERR(class_dev)) {
931                 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
932                             ch->minor);
933                 ret = PTR_ERR(class_dev);
934                 goto remove_idr;
935         }
936
937         mutex_init(&ch->lock);
938         ch->device = sd;
939         ch_readconfig(ch);
940         if (init)
941                 ch_init_elem(ch);
942
943         dev_set_drvdata(dev, ch);
944         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
945
946         return 0;
947 remove_idr:
948         idr_remove(&ch_index_idr, ch->minor);
949 free_ch:
950         kfree(ch);
951         return ret;
952 }
953
954 static int ch_remove(struct device *dev)
955 {
956         scsi_changer *ch = dev_get_drvdata(dev);
957
958         spin_lock(&ch_index_lock);
959         idr_remove(&ch_index_idr, ch->minor);
960         spin_unlock(&ch_index_lock);
961
962         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
963         kfree(ch->dt);
964         kfree(ch);
965         return 0;
966 }
967
968 static struct scsi_driver ch_template = {
969         .gendrv         = {
970                 .name   = "ch",
971                 .owner  = THIS_MODULE,
972                 .probe  = ch_probe,
973                 .remove = ch_remove,
974         },
975 };
976
977 static const struct file_operations changer_fops = {
978         .owner          = THIS_MODULE,
979         .open           = ch_open,
980         .release        = ch_release,
981         .unlocked_ioctl = ch_ioctl,
982 #ifdef CONFIG_COMPAT
983         .compat_ioctl   = ch_ioctl_compat,
984 #endif
985         .llseek         = noop_llseek,
986 };
987
988 static int __init init_ch_module(void)
989 {
990         int rc;
991
992         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
993         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
994         if (IS_ERR(ch_sysfs_class)) {
995                 rc = PTR_ERR(ch_sysfs_class);
996                 return rc;
997         }
998         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
999         if (rc < 0) {
1000                 printk("Unable to get major %d for SCSI-Changer\n",
1001                        SCSI_CHANGER_MAJOR);
1002                 goto fail1;
1003         }
1004         rc = scsi_register_driver(&ch_template.gendrv);
1005         if (rc < 0)
1006                 goto fail2;
1007         return 0;
1008
1009  fail2:
1010         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1011  fail1:
1012         class_destroy(ch_sysfs_class);
1013         return rc;
1014 }
1015
1016 static void __exit exit_ch_module(void)
1017 {
1018         scsi_unregister_driver(&ch_template.gendrv);
1019         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1020         class_destroy(ch_sysfs_class);
1021         idr_destroy(&ch_index_idr);
1022 }
1023
1024 module_init(init_ch_module);
1025 module_exit(exit_ch_module);
1026
1027 /*
1028  * Local variables:
1029  * c-basic-offset: 8
1030  * End:
1031  */