GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / scsi / ch.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * SCSI Media Changer device driver for Linux 2.6
4  *
5  *     (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
6  *
7  */
8
9 #define VERSION "0.25"
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/fs.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/major.h>
17 #include <linux/string.h>
18 #include <linux/errno.h>
19 #include <linux/interrupt.h>
20 #include <linux/blkdev.h>
21 #include <linux/completion.h>
22 #include <linux/compat.h>
23 #include <linux/chio.h>                 /* here are all the ioctls */
24 #include <linux/mutex.h>
25 #include <linux/idr.h>
26 #include <linux/slab.h>
27
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_driver.h>
31 #include <scsi/scsi_ioctl.h>
32 #include <scsi/scsi_host.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_dbg.h>
36
37 #define CH_DT_MAX       16
38 #define CH_TYPES        8
39 #define CH_MAX_DEVS     128
40
41 MODULE_DESCRIPTION("device driver for scsi media changer devices");
42 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
43 MODULE_LICENSE("GPL");
44 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
45 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
46
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 kref         ref;
109         struct list_head    list;
110         int                 minor;
111         char                name[8];
112         struct scsi_device  *device;
113         struct scsi_device  **dt;        /* ptrs to data transfer elements */
114         u_int               firsts[CH_TYPES];
115         u_int               counts[CH_TYPES];
116         u_int               unit_attention;
117         u_int               voltags;
118         struct mutex        lock;
119 } scsi_changer;
120
121 static DEFINE_IDR(ch_index_idr);
122 static DEFINE_SPINLOCK(ch_index_lock);
123
124 static const struct {
125         unsigned char  sense;
126         unsigned char  asc;
127         unsigned char  ascq;
128         int            errno;
129 } ch_err[] = {
130 /* Just filled in what looks right. Hav'nt checked any standard paper for
131    these errno assignments, so they may be wrong... */
132         {
133                 .sense  = ILLEGAL_REQUEST,
134                 .asc    = 0x21,
135                 .ascq   = 0x01,
136                 .errno  = EBADSLT, /* Invalid element address */
137         },{
138                 .sense  = ILLEGAL_REQUEST,
139                 .asc    = 0x28,
140                 .ascq   = 0x01,
141                 .errno  = EBADE,   /* Import or export element accessed */
142         },{
143                 .sense  = ILLEGAL_REQUEST,
144                 .asc    = 0x3B,
145                 .ascq   = 0x0D,
146                 .errno  = EXFULL,  /* Medium destination element full */
147         },{
148                 .sense  = ILLEGAL_REQUEST,
149                 .asc    = 0x3B,
150                 .ascq   = 0x0E,
151                 .errno  = EBADE,   /* Medium source element empty */
152         },{
153                 .sense  = ILLEGAL_REQUEST,
154                 .asc    = 0x20,
155                 .ascq   = 0x00,
156                 .errno  = EBADRQC, /* Invalid command operation code */
157         },{
158                 /* end of list */
159         }
160 };
161
162 /* ------------------------------------------------------------------- */
163
164 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
165 {
166         int i,errno = 0;
167
168         /* Check to see if additional sense information is available */
169         if (scsi_sense_valid(sshdr) &&
170             sshdr->asc != 0) {
171                 for (i = 0; ch_err[i].errno != 0; i++) {
172                         if (ch_err[i].sense == sshdr->sense_key &&
173                             ch_err[i].asc   == sshdr->asc &&
174                             ch_err[i].ascq  == sshdr->ascq) {
175                                 errno = -ch_err[i].errno;
176                                 break;
177                         }
178                 }
179         }
180         if (errno == 0)
181                 errno = -EIO;
182         return errno;
183 }
184
185 static int
186 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
187            void *buffer, unsigned buflength,
188            enum dma_data_direction direction)
189 {
190         int errno, retries = 0, timeout, result;
191         struct scsi_sense_hdr sshdr;
192
193         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
194                 ? timeout_init : timeout_move;
195
196  retry:
197         errno = 0;
198         result = scsi_execute_req(ch->device, cmd, direction, buffer,
199                                   buflength, &sshdr, timeout * HZ,
200                                   MAX_RETRIES, NULL);
201
202         if (driver_byte(result) == DRIVER_SENSE) {
203                 if (debug)
204                         scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
205                 errno = ch_find_errno(&sshdr);
206
207                 switch(sshdr.sense_key) {
208                 case UNIT_ATTENTION:
209                         ch->unit_attention = 1;
210                         if (retries++ < 3)
211                                 goto retry;
212                         break;
213                 }
214         }
215         return errno;
216 }
217
218 /* ------------------------------------------------------------------------ */
219
220 static int
221 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
222 {
223         int i;
224
225         for (i = 0; i < CH_TYPES; i++) {
226                 if (elem >= ch->firsts[i]  &&
227                     elem <  ch->firsts[i] +
228                     ch->counts[i])
229                         return i+1;
230         }
231         return 0;
232 }
233
234 static int
235 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
236 {
237         u_char  cmd[12];
238         u_char  *buffer;
239         int     result;
240
241         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
242         if(!buffer)
243                 return -ENOMEM;
244
245  retry:
246         memset(cmd,0,sizeof(cmd));
247         cmd[0] = READ_ELEMENT_STATUS;
248         cmd[1] = ((ch->device->lun & 0x7) << 5) |
249                 (ch->voltags ? 0x10 : 0) |
250                 ch_elem_to_typecode(ch,elem);
251         cmd[2] = (elem >> 8) & 0xff;
252         cmd[3] = elem        & 0xff;
253         cmd[5] = 1;
254         cmd[9] = 255;
255         if (0 == (result = ch_do_scsi(ch, cmd, 12,
256                                       buffer, 256, DMA_FROM_DEVICE))) {
257                 if (((buffer[16] << 8) | buffer[17]) != elem) {
258                         DPRINTK("asked for element 0x%02x, got 0x%02x\n",
259                                 elem,(buffer[16] << 8) | buffer[17]);
260                         kfree(buffer);
261                         return -EIO;
262                 }
263                 memcpy(data,buffer+16,16);
264         } else {
265                 if (ch->voltags) {
266                         ch->voltags = 0;
267                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
268                         goto retry;
269                 }
270                 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
271         }
272         kfree(buffer);
273         return result;
274 }
275
276 static int
277 ch_init_elem(scsi_changer *ch)
278 {
279         int err;
280         u_char cmd[6];
281
282         VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
283         memset(cmd,0,sizeof(cmd));
284         cmd[0] = INITIALIZE_ELEMENT_STATUS;
285         cmd[1] = (ch->device->lun & 0x7) << 5;
286         err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
287         VPRINTK(KERN_INFO, "... finished\n");
288         return err;
289 }
290
291 static int
292 ch_readconfig(scsi_changer *ch)
293 {
294         u_char  cmd[10], data[16];
295         u_char  *buffer;
296         int     result,id,lun,i;
297         u_int   elem;
298
299         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
300         if (!buffer)
301                 return -ENOMEM;
302
303         memset(cmd,0,sizeof(cmd));
304         cmd[0] = MODE_SENSE;
305         cmd[1] = (ch->device->lun & 0x7) << 5;
306         cmd[2] = 0x1d;
307         cmd[4] = 255;
308         result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
309         if (0 != result) {
310                 cmd[1] |= (1<<3);
311                 result  = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
312         }
313         if (0 == result) {
314                 ch->firsts[CHET_MT] =
315                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
316                 ch->counts[CHET_MT] =
317                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
318                 ch->firsts[CHET_ST] =
319                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
320                 ch->counts[CHET_ST] =
321                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
322                 ch->firsts[CHET_IE] =
323                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
324                 ch->counts[CHET_IE] =
325                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
326                 ch->firsts[CHET_DT] =
327                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
328                 ch->counts[CHET_DT] =
329                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
330                 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
331                         ch->firsts[CHET_MT],
332                         ch->counts[CHET_MT]);
333                 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
334                         ch->firsts[CHET_ST],
335                         ch->counts[CHET_ST]);
336                 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
337                         ch->firsts[CHET_IE],
338                         ch->counts[CHET_IE]);
339                 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
340                         ch->firsts[CHET_DT],
341                         ch->counts[CHET_DT]);
342         } else {
343                 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
344         }
345
346         /* vendor specific element types */
347         for (i = 0; i < 4; i++) {
348                 if (0 == vendor_counts[i])
349                         continue;
350                 if (NULL == vendor_labels[i])
351                         continue;
352                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
353                 ch->counts[CHET_V1+i] = vendor_counts[i];
354                 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
355                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
356                         vendor_labels[i]);
357         }
358
359         /* look up the devices of the data transfer elements */
360         ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
361                          GFP_KERNEL);
362
363         if (!ch->dt) {
364                 kfree(buffer);
365                 return -ENOMEM;
366         }
367
368         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
369                 id  = -1;
370                 lun = 0;
371                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
372                         id  = dt_id[elem];
373                         lun = dt_lun[elem];
374                         VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
375                                 elem+ch->firsts[CHET_DT]);
376                 } else if (0 != ch_read_element_status
377                            (ch,elem+ch->firsts[CHET_DT],data)) {
378                         VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
379                                 elem+ch->firsts[CHET_DT]);
380                 } else {
381                         VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
382                         if (data[6] & 0x80) {
383                                 VPRINTK(KERN_CONT, "not this SCSI bus\n");
384                                 ch->dt[elem] = NULL;
385                         } else if (0 == (data[6] & 0x30)) {
386                                 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
387                                 ch->dt[elem] = NULL;
388                         } else {
389                                 id  = ch->device->id;
390                                 lun = 0;
391                                 if (data[6] & 0x20) id  = data[7];
392                                 if (data[6] & 0x10) lun = data[6] & 7;
393                         }
394                 }
395                 if (-1 != id) {
396                         VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
397                         ch->dt[elem] =
398                                 scsi_device_lookup(ch->device->host,
399                                                    ch->device->channel,
400                                                    id,lun);
401                         if (!ch->dt[elem]) {
402                                 /* should not happen */
403                                 VPRINTK(KERN_CONT, "Huh? device not found!\n");
404                         } else {
405                                 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
406                                         ch->dt[elem]->vendor,
407                                         ch->dt[elem]->model,
408                                         ch->dt[elem]->rev);
409                         }
410                 }
411         }
412         ch->voltags = 1;
413         kfree(buffer);
414
415         return 0;
416 }
417
418 /* ------------------------------------------------------------------------ */
419
420 static int
421 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
422 {
423         u_char  cmd[10];
424
425         DPRINTK("position: 0x%x\n",elem);
426         if (0 == trans)
427                 trans = ch->firsts[CHET_MT];
428         memset(cmd,0,sizeof(cmd));
429         cmd[0]  = POSITION_TO_ELEMENT;
430         cmd[1]  = (ch->device->lun & 0x7) << 5;
431         cmd[2]  = (trans >> 8) & 0xff;
432         cmd[3]  =  trans       & 0xff;
433         cmd[4]  = (elem  >> 8) & 0xff;
434         cmd[5]  =  elem        & 0xff;
435         cmd[8]  = rotate ? 1 : 0;
436         return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
437 }
438
439 static int
440 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
441 {
442         u_char  cmd[12];
443
444         DPRINTK("move: 0x%x => 0x%x\n",src,dest);
445         if (0 == trans)
446                 trans = ch->firsts[CHET_MT];
447         memset(cmd,0,sizeof(cmd));
448         cmd[0]  = MOVE_MEDIUM;
449         cmd[1]  = (ch->device->lun & 0x7) << 5;
450         cmd[2]  = (trans >> 8) & 0xff;
451         cmd[3]  =  trans       & 0xff;
452         cmd[4]  = (src   >> 8) & 0xff;
453         cmd[5]  =  src         & 0xff;
454         cmd[6]  = (dest  >> 8) & 0xff;
455         cmd[7]  =  dest        & 0xff;
456         cmd[10] = rotate ? 1 : 0;
457         return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
458 }
459
460 static int
461 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
462             u_int dest1, u_int dest2, int rotate1, int rotate2)
463 {
464         u_char  cmd[12];
465
466         DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
467                 src,dest1,dest2);
468         if (0 == trans)
469                 trans = ch->firsts[CHET_MT];
470         memset(cmd,0,sizeof(cmd));
471         cmd[0]  = EXCHANGE_MEDIUM;
472         cmd[1]  = (ch->device->lun & 0x7) << 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]  = (dest1 >> 8) & 0xff;
478         cmd[7]  =  dest1       & 0xff;
479         cmd[8]  = (dest2 >> 8) & 0xff;
480         cmd[9]  =  dest2       & 0xff;
481         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
482
483         return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
484 }
485
486 static void
487 ch_check_voltag(char *tag)
488 {
489         int i;
490
491         for (i = 0; i < 32; i++) {
492                 /* restrict to ascii */
493                 if (tag[i] >= 0x7f || tag[i] < 0x20)
494                         tag[i] = ' ';
495                 /* don't allow search wildcards */
496                 if (tag[i] == '?' ||
497                     tag[i] == '*')
498                         tag[i] = ' ';
499         }
500 }
501
502 static int
503 ch_set_voltag(scsi_changer *ch, u_int elem,
504               int alternate, int clear, u_char *tag)
505 {
506         u_char  cmd[12];
507         u_char  *buffer;
508         int result;
509
510         buffer = kzalloc(512, GFP_KERNEL);
511         if (!buffer)
512                 return -ENOMEM;
513
514         DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
515                 clear     ? "clear"     : "set",
516                 alternate ? "alternate" : "primary",
517                 elem, tag);
518         memset(cmd,0,sizeof(cmd));
519         cmd[0]  = SEND_VOLUME_TAG;
520         cmd[1] = ((ch->device->lun & 0x7) << 5) |
521                 ch_elem_to_typecode(ch,elem);
522         cmd[2] = (elem >> 8) & 0xff;
523         cmd[3] = elem        & 0xff;
524         cmd[5] = clear
525                 ? (alternate ? 0x0d : 0x0c)
526                 : (alternate ? 0x0b : 0x0a);
527
528         cmd[9] = 255;
529
530         memcpy(buffer,tag,32);
531         ch_check_voltag(buffer);
532
533         result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
534         kfree(buffer);
535         return result;
536 }
537
538 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
539 {
540         int retval = 0;
541         u_char data[16];
542         unsigned int i;
543
544         mutex_lock(&ch->lock);
545         for (i = 0; i < ch->counts[type]; i++) {
546                 if (0 != ch_read_element_status
547                     (ch, ch->firsts[type]+i,data)) {
548                         retval = -EIO;
549                         break;
550                 }
551                 put_user(data[2], dest+i);
552                 if (data[2] & CESTATUS_EXCEPT)
553                         VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
554                                 ch->firsts[type]+i,
555                                 (int)data[4],(int)data[5]);
556                 retval = ch_read_element_status
557                         (ch, ch->firsts[type]+i,data);
558                 if (0 != retval)
559                         break;
560         }
561         mutex_unlock(&ch->lock);
562         return retval;
563 }
564
565 /* ------------------------------------------------------------------------ */
566
567 static void ch_destroy(struct kref *ref)
568 {
569         scsi_changer *ch = container_of(ref, scsi_changer, ref);
570
571         ch->device = NULL;
572         kfree(ch->dt);
573         kfree(ch);
574 }
575
576 static int
577 ch_release(struct inode *inode, struct file *file)
578 {
579         scsi_changer *ch = file->private_data;
580
581         scsi_device_put(ch->device);
582         file->private_data = NULL;
583         kref_put(&ch->ref, ch_destroy);
584         return 0;
585 }
586
587 static int
588 ch_open(struct inode *inode, struct file *file)
589 {
590         scsi_changer *ch;
591         int minor = iminor(inode);
592
593         spin_lock(&ch_index_lock);
594         ch = idr_find(&ch_index_idr, minor);
595
596         if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
597                 spin_unlock(&ch_index_lock);
598                 return -ENXIO;
599         }
600         spin_unlock(&ch_index_lock);
601         if (scsi_device_get(ch->device)) {
602                 kref_put(&ch->ref, ch_destroy);
603                 return -ENXIO;
604         }
605         /* Synchronize with ch_probe() */
606         mutex_lock(&ch->lock);
607         file->private_data = ch;
608         mutex_unlock(&ch->lock);
609         return 0;
610 }
611
612 static int
613 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
614 {
615         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
616                 return -1;
617         return 0;
618 }
619
620 static long ch_ioctl(struct file *file,
621                     unsigned int cmd, unsigned long arg)
622 {
623         scsi_changer *ch = file->private_data;
624         int retval;
625         void __user *argp = (void __user *)arg;
626
627         retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
628                         file->f_flags & O_NDELAY);
629         if (retval)
630                 return retval;
631
632         switch (cmd) {
633         case CHIOGPARAMS:
634         {
635                 struct changer_params params;
636
637                 params.cp_curpicker = 0;
638                 params.cp_npickers  = ch->counts[CHET_MT];
639                 params.cp_nslots    = ch->counts[CHET_ST];
640                 params.cp_nportals  = ch->counts[CHET_IE];
641                 params.cp_ndrives   = ch->counts[CHET_DT];
642
643                 if (copy_to_user(argp, &params, sizeof(params)))
644                         return -EFAULT;
645                 return 0;
646         }
647         case CHIOGVPARAMS:
648         {
649                 struct changer_vendor_params vparams;
650
651                 memset(&vparams,0,sizeof(vparams));
652                 if (ch->counts[CHET_V1]) {
653                         vparams.cvp_n1  = ch->counts[CHET_V1];
654                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
655                 }
656                 if (ch->counts[CHET_V2]) {
657                         vparams.cvp_n2  = ch->counts[CHET_V2];
658                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
659                 }
660                 if (ch->counts[CHET_V3]) {
661                         vparams.cvp_n3  = ch->counts[CHET_V3];
662                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
663                 }
664                 if (ch->counts[CHET_V4]) {
665                         vparams.cvp_n4  = ch->counts[CHET_V4];
666                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
667                 }
668                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
669                         return -EFAULT;
670                 return 0;
671         }
672
673         case CHIOPOSITION:
674         {
675                 struct changer_position pos;
676
677                 if (copy_from_user(&pos, argp, sizeof (pos)))
678                         return -EFAULT;
679
680                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
681                         DPRINTK("CHIOPOSITION: invalid parameter\n");
682                         return -EBADSLT;
683                 }
684                 mutex_lock(&ch->lock);
685                 retval = ch_position(ch,0,
686                                      ch->firsts[pos.cp_type] + pos.cp_unit,
687                                      pos.cp_flags & CP_INVERT);
688                 mutex_unlock(&ch->lock);
689                 return retval;
690         }
691
692         case CHIOMOVE:
693         {
694                 struct changer_move mv;
695
696                 if (copy_from_user(&mv, argp, sizeof (mv)))
697                         return -EFAULT;
698
699                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
700                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
701                         DPRINTK("CHIOMOVE: invalid parameter\n");
702                         return -EBADSLT;
703                 }
704
705                 mutex_lock(&ch->lock);
706                 retval = ch_move(ch,0,
707                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
708                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
709                                  mv.cm_flags & CM_INVERT);
710                 mutex_unlock(&ch->lock);
711                 return retval;
712         }
713
714         case CHIOEXCHANGE:
715         {
716                 struct changer_exchange mv;
717
718                 if (copy_from_user(&mv, argp, sizeof (mv)))
719                         return -EFAULT;
720
721                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
722                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
723                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
724                         DPRINTK("CHIOEXCHANGE: invalid parameter\n");
725                         return -EBADSLT;
726                 }
727
728                 mutex_lock(&ch->lock);
729                 retval = ch_exchange
730                         (ch,0,
731                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
732                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
733                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
734                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
735                 mutex_unlock(&ch->lock);
736                 return retval;
737         }
738
739         case CHIOGSTATUS:
740         {
741                 struct changer_element_status ces;
742
743                 if (copy_from_user(&ces, argp, sizeof (ces)))
744                         return -EFAULT;
745                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
746                         return -EINVAL;
747
748                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
749         }
750
751         case CHIOGELEM:
752         {
753                 struct changer_get_element cge;
754                 u_char ch_cmd[12];
755                 u_char *buffer;
756                 unsigned int elem;
757                 int     result,i;
758
759                 if (copy_from_user(&cge, argp, sizeof (cge)))
760                         return -EFAULT;
761
762                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
763                         return -EINVAL;
764                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
765
766                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
767                 if (!buffer)
768                         return -ENOMEM;
769                 mutex_lock(&ch->lock);
770
771         voltag_retry:
772                 memset(ch_cmd, 0, sizeof(ch_cmd));
773                 ch_cmd[0] = READ_ELEMENT_STATUS;
774                 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
775                         (ch->voltags ? 0x10 : 0) |
776                         ch_elem_to_typecode(ch,elem);
777                 ch_cmd[2] = (elem >> 8) & 0xff;
778                 ch_cmd[3] = elem        & 0xff;
779                 ch_cmd[5] = 1;
780                 ch_cmd[9] = 255;
781
782                 result = ch_do_scsi(ch, ch_cmd, 12,
783                                     buffer, 256, DMA_FROM_DEVICE);
784                 if (!result) {
785                         cge.cge_status = buffer[18];
786                         cge.cge_flags = 0;
787                         if (buffer[18] & CESTATUS_EXCEPT) {
788                                 cge.cge_errno = EIO;
789                         }
790                         if (buffer[25] & 0x80) {
791                                 cge.cge_flags |= CGE_SRC;
792                                 if (buffer[25] & 0x40)
793                                         cge.cge_flags |= CGE_INVERT;
794                                 elem = (buffer[26]<<8) | buffer[27];
795                                 for (i = 0; i < 4; i++) {
796                                         if (elem >= ch->firsts[i] &&
797                                             elem <  ch->firsts[i] + ch->counts[i]) {
798                                                 cge.cge_srctype = i;
799                                                 cge.cge_srcunit = elem-ch->firsts[i];
800                                         }
801                                 }
802                         }
803                         if ((buffer[22] & 0x30) == 0x30) {
804                                 cge.cge_flags |= CGE_IDLUN;
805                                 cge.cge_id  = buffer[23];
806                                 cge.cge_lun = buffer[22] & 7;
807                         }
808                         if (buffer[9] & 0x80) {
809                                 cge.cge_flags |= CGE_PVOLTAG;
810                                 memcpy(cge.cge_pvoltag,buffer+28,36);
811                         }
812                         if (buffer[9] & 0x40) {
813                                 cge.cge_flags |= CGE_AVOLTAG;
814                                 memcpy(cge.cge_avoltag,buffer+64,36);
815                         }
816                 } else if (ch->voltags) {
817                         ch->voltags = 0;
818                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
819                         goto voltag_retry;
820                 }
821                 kfree(buffer);
822                 mutex_unlock(&ch->lock);
823
824                 if (copy_to_user(argp, &cge, sizeof (cge)))
825                         return -EFAULT;
826                 return result;
827         }
828
829         case CHIOINITELEM:
830         {
831                 mutex_lock(&ch->lock);
832                 retval = ch_init_elem(ch);
833                 mutex_unlock(&ch->lock);
834                 return retval;
835         }
836
837         case CHIOSVOLTAG:
838         {
839                 struct changer_set_voltag csv;
840                 int elem;
841
842                 if (copy_from_user(&csv, argp, sizeof(csv)))
843                         return -EFAULT;
844
845                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
846                         DPRINTK("CHIOSVOLTAG: invalid parameter\n");
847                         return -EBADSLT;
848                 }
849                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
850                 mutex_lock(&ch->lock);
851                 retval = ch_set_voltag(ch, elem,
852                                        csv.csv_flags & CSV_AVOLTAG,
853                                        csv.csv_flags & CSV_CLEARTAG,
854                                        csv.csv_voltag);
855                 mutex_unlock(&ch->lock);
856                 return retval;
857         }
858
859         default:
860                 return scsi_ioctl(ch->device, cmd, argp);
861
862         }
863 }
864
865 #ifdef CONFIG_COMPAT
866
867 struct changer_element_status32 {
868         int             ces_type;
869         compat_uptr_t   ces_data;
870 };
871 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
872
873 static long ch_ioctl_compat(struct file * file,
874                             unsigned int cmd, unsigned long arg)
875 {
876         scsi_changer *ch = file->private_data;
877         int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
878                                                         file->f_flags & O_NDELAY);
879         if (retval)
880                 return retval;
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(file, cmd, (unsigned long)compat_ptr(arg));
893         case CHIOGSTATUS32:
894         {
895                 struct changer_element_status32 ces32;
896                 unsigned char __user *data;
897
898                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
899                         return -EFAULT;
900                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
901                         return -EINVAL;
902
903                 data = compat_ptr(ces32.ces_data);
904                 return ch_gstatus(ch, ces32.ces_type, data);
905         }
906         default:
907                 return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
908
909         }
910 }
911 #endif
912
913 /* ------------------------------------------------------------------------ */
914
915 static int ch_probe(struct device *dev)
916 {
917         struct scsi_device *sd = to_scsi_device(dev);
918         struct device *class_dev;
919         int ret;
920         scsi_changer *ch;
921
922         if (sd->type != TYPE_MEDIUM_CHANGER)
923                 return -ENODEV;
924
925         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
926         if (NULL == ch)
927                 return -ENOMEM;
928
929         idr_preload(GFP_KERNEL);
930         spin_lock(&ch_index_lock);
931         ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
932         spin_unlock(&ch_index_lock);
933         idr_preload_end();
934
935         if (ret < 0) {
936                 if (ret == -ENOSPC)
937                         ret = -ENODEV;
938                 goto free_ch;
939         }
940
941         ch->minor = ret;
942         sprintf(ch->name,"ch%d",ch->minor);
943         ret = scsi_device_get(sd);
944         if (ret) {
945                 sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
946                             ch->minor);
947                 goto remove_idr;
948         }
949
950         mutex_init(&ch->lock);
951         kref_init(&ch->ref);
952         ch->device = sd;
953         class_dev = device_create(ch_sysfs_class, dev,
954                                   MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
955                                   "s%s", ch->name);
956         if (IS_ERR(class_dev)) {
957                 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
958                             ch->minor);
959                 ret = PTR_ERR(class_dev);
960                 goto put_device;
961         }
962
963         mutex_lock(&ch->lock);
964         ret = ch_readconfig(ch);
965         if (ret) {
966                 mutex_unlock(&ch->lock);
967                 goto destroy_dev;
968         }
969         if (init)
970                 ch_init_elem(ch);
971
972         mutex_unlock(&ch->lock);
973         dev_set_drvdata(dev, ch);
974         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
975
976         return 0;
977 destroy_dev:
978         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
979 put_device:
980         scsi_device_put(sd);
981 remove_idr:
982         idr_remove(&ch_index_idr, ch->minor);
983 free_ch:
984         kfree(ch);
985         return ret;
986 }
987
988 static int ch_remove(struct device *dev)
989 {
990         scsi_changer *ch = dev_get_drvdata(dev);
991
992         spin_lock(&ch_index_lock);
993         idr_remove(&ch_index_idr, ch->minor);
994         dev_set_drvdata(dev, NULL);
995         spin_unlock(&ch_index_lock);
996
997         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
998         scsi_device_put(ch->device);
999         kref_put(&ch->ref, ch_destroy);
1000         return 0;
1001 }
1002
1003 static struct scsi_driver ch_template = {
1004         .gendrv         = {
1005                 .name   = "ch",
1006                 .owner  = THIS_MODULE,
1007                 .probe  = ch_probe,
1008                 .remove = ch_remove,
1009         },
1010 };
1011
1012 static const struct file_operations changer_fops = {
1013         .owner          = THIS_MODULE,
1014         .open           = ch_open,
1015         .release        = ch_release,
1016         .unlocked_ioctl = ch_ioctl,
1017 #ifdef CONFIG_COMPAT
1018         .compat_ioctl   = ch_ioctl_compat,
1019 #endif
1020         .llseek         = noop_llseek,
1021 };
1022
1023 static int __init init_ch_module(void)
1024 {
1025         int rc;
1026
1027         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
1028         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1029         if (IS_ERR(ch_sysfs_class)) {
1030                 rc = PTR_ERR(ch_sysfs_class);
1031                 return rc;
1032         }
1033         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1034         if (rc < 0) {
1035                 printk("Unable to get major %d for SCSI-Changer\n",
1036                        SCSI_CHANGER_MAJOR);
1037                 goto fail1;
1038         }
1039         rc = scsi_register_driver(&ch_template.gendrv);
1040         if (rc < 0)
1041                 goto fail2;
1042         return 0;
1043
1044  fail2:
1045         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1046  fail1:
1047         class_destroy(ch_sysfs_class);
1048         return rc;
1049 }
1050
1051 static void __exit exit_ch_module(void)
1052 {
1053         scsi_unregister_driver(&ch_template.gendrv);
1054         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1055         class_destroy(ch_sysfs_class);
1056         idr_destroy(&ch_index_idr);
1057 }
1058
1059 module_init(init_ch_module);
1060 module_exit(exit_ch_module);
1061
1062 /*
1063  * Local variables:
1064  * c-basic-offset: 8
1065  * End:
1066  */