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/smp_lock.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 dprintk(fmt, arg...)    if (debug) \
  88         printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
  89 #define vprintk(fmt, arg...)    if (verbose) \
  90         printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
  91
  92 /* ------------------------------------------------------------------- */
  93
  94 #define MAX_RETRIES   1
  95
  96 static struct class * ch_sysfs_class;
  97
  98 typedef struct {
  99         struct list_head    list;
 100         int                 minor;
 101         char                name[8];
 102         struct scsi_device  *device;
 103         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 104         u_int               firsts[CH_TYPES];
 105         u_int               counts[CH_TYPES];
 106         u_int               unit_attention;
 107         u_int               voltags;
 108         struct mutex        lock;
 109 } scsi_changer;
 110
 111 static DEFINE_IDR(ch_index_idr);
 112 static DEFINE_SPINLOCK(ch_index_lock);
 113
 114 static const struct {
 115         unsigned char  sense;
 116         unsigned char  asc;
 117         unsigned char  ascq;
 118         int            errno;
 119 } ch_err[] = {
 120 /* Just filled in what looks right. Hav'nt checked any standard paper for
 121    these errno assignments, so they may be wrong... */
 122         {
 123                 .sense  = ILLEGAL_REQUEST,
 124                 .asc    = 0x21,
 125                 .ascq   = 0x01,
 126                 .errno  = EBADSLT, /* Invalid element address */
 127         },{
 128                 .sense  = ILLEGAL_REQUEST,
 129                 .asc    = 0x28,
 130                 .ascq   = 0x01,
 131                 .errno  = EBADE,   /* Import or export element accessed */
 132         },{
 133                 .sense  = ILLEGAL_REQUEST,
 134                 .asc    = 0x3B,
 135                 .ascq   = 0x0D,
 136                 .errno  = EXFULL,  /* Medium destination element full */
 137         },{
 138                 .sense  = ILLEGAL_REQUEST,
 139                 .asc    = 0x3B,
 140                 .ascq   = 0x0E,
 141                 .errno  = EBADE,   /* Medium source element empty */
 142         },{
 143                 .sense  = ILLEGAL_REQUEST,
 144                 .asc    = 0x20,
 145                 .ascq   = 0x00,
 146                 .errno  = EBADRQC, /* Invalid command operation code */
 147         },{
 148                 /* end of list */
 149         }
 150 };
 151
 152 /* ------------------------------------------------------------------- */
 153
 154 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 155 {
 156         int i,errno = 0;
 157
 158         /* Check to see if additional sense information is available */
 159         if (scsi_sense_valid(sshdr) &&
 160             sshdr->asc != 0) {
 161                 for (i = 0; ch_err[i].errno != 0; i++) {
 162                         if (ch_err[i].sense == sshdr->sense_key &&
 163                             ch_err[i].asc   == sshdr->asc &&
 164                             ch_err[i].ascq  == sshdr->ascq) {
 165                                 errno = -ch_err[i].errno;
 166                                 break;
 167                         }
 168                 }
 169         }
 170         if (errno == 0)
 171                 errno = -EIO;
 172         return errno;
 173 }
 174
 175 static int
 176 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 177            void *buffer, unsigned buflength,
 178            enum dma_data_direction direction)
 179 {
 180         int errno, retries = 0, timeout, result;
 181         struct scsi_sense_hdr sshdr;
 182
 183         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 184                 ? timeout_init : timeout_move;
 185
 186  retry:
 187         errno = 0;
 188         if (debug) {
 189                 dprintk("command: ");
 190                 __scsi_print_command(cmd);
 191         }
 192
 193         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 194                                   buflength, &sshdr, timeout * HZ,
 195                                   MAX_RETRIES, NULL);
 196
 197         dprintk("result: 0x%x\n",result);
 198         if (driver_byte(result) & DRIVER_SENSE) {
 199                 if (debug)
 200                         scsi_print_sense_hdr(ch->name, &sshdr);
 201                 errno = ch_find_errno(&sshdr);
 202
 203                 switch(sshdr.sense_key) {
 204                 case UNIT_ATTENTION:
 205                         ch->unit_attention = 1;
 206                         if (retries++ < 3)
 207                                 goto retry;
 208                         break;
 209                 }
 210         }
 211         return errno;
 212 }
 213
 214 /* ------------------------------------------------------------------------ */
 215
 216 static int
 217 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 218 {
 219         int i;
 220
 221         for (i = 0; i < CH_TYPES; i++) {
 222                 if (elem >= ch->firsts[i]  &&
 223                     elem <  ch->firsts[i] +
 224                     ch->counts[i])
 225                         return i+1;
 226         }
 227         return 0;
 228 }
 229
 230 static int
 231 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 232 {
 233         u_char  cmd[12];
 234         u_char  *buffer;
 235         int     result;
 236
 237         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 238         if(!buffer)
 239                 return -ENOMEM;
 240
 241  retry:
 242         memset(cmd,0,sizeof(cmd));
 243         cmd[0] = READ_ELEMENT_STATUS;
 244         cmd[1] = (ch->device->lun << 5) |
 245                 (ch->voltags ? 0x10 : 0) |
 246                 ch_elem_to_typecode(ch,elem);
 247         cmd[2] = (elem >> 8) & 0xff;
 248         cmd[3] = elem        & 0xff;
 249         cmd[5] = 1;
 250         cmd[9] = 255;
 251         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 252                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 253                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 254                                 elem,(buffer[16] << 8) | buffer[17]);
 255                         kfree(buffer);
 256                         return -EIO;
 257                 }
 258                 memcpy(data,buffer+16,16);
 259         } else {
 260                 if (ch->voltags) {
 261                         ch->voltags = 0;
 262                         vprintk("device has no volume tag support\n");
 263                         goto retry;
 264                 }
 265                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 266         }
 267         kfree(buffer);
 268         return result;
 269 }
 270
 271 static int
 272 ch_init_elem(scsi_changer *ch)
 273 {
 274         int err;
 275         u_char cmd[6];
 276
 277         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 278         memset(cmd,0,sizeof(cmd));
 279         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 280         cmd[1] = ch->device->lun << 5;
 281         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 282         vprintk("... finished\n");
 283         return err;
 284 }
 285
 286 static int
 287 ch_readconfig(scsi_changer *ch)
 288 {
 289         u_char  cmd[10], data[16];
 290         u_char  *buffer;
 291         int     result,id,lun,i;
 292         u_int   elem;
 293
 294         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 295         if (!buffer)
 296                 return -ENOMEM;
 297
 298         memset(cmd,0,sizeof(cmd));
 299         cmd[0] = MODE_SENSE;
 300         cmd[1] = ch->device->lun << 5;
 301         cmd[2] = 0x1d;
 302         cmd[4] = 255;
 303         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 304         if (0 != result) {
 305                 cmd[1] |= (1<<3);
 306                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 307         }
 308         if (0 == result) {
 309                 ch->firsts[CHET_MT] =
 310                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 311                 ch->counts[CHET_MT] =
 312                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 313                 ch->firsts[CHET_ST] =
 314                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 315                 ch->counts[CHET_ST] =
 316                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 317                 ch->firsts[CHET_IE] =
 318                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 319                 ch->counts[CHET_IE] =
 320                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 321                 ch->firsts[CHET_DT] =
 322                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 323                 ch->counts[CHET_DT] =
 324                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 325                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 326                         ch->firsts[CHET_MT],
 327                         ch->counts[CHET_MT]);
 328                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 329                         ch->firsts[CHET_ST],
 330                         ch->counts[CHET_ST]);
 331                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 332                         ch->firsts[CHET_IE],
 333                         ch->counts[CHET_IE]);
 334                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 335                         ch->firsts[CHET_DT],
 336                         ch->counts[CHET_DT]);
 337         } else {
 338                 vprintk("reading element address assigment page failed!\n");
 339         }
 340
 341         /* vendor specific element types */
 342         for (i = 0; i < 4; i++) {
 343                 if (0 == vendor_counts[i])
 344                         continue;
 345                 if (NULL == vendor_labels[i])
 346                         continue;
 347                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 348                 ch->counts[CHET_V1+i] = vendor_counts[i];
 349                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 350                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 351                         vendor_labels[i]);
 352         }
 353
 354         /* look up the devices of the data transfer elements */
 355         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 356                          GFP_KERNEL);
 357
 358         if (!ch->dt) {
 359                 kfree(buffer);
 360                 return -ENOMEM;
 361         }
 362
 363         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 364                 id  = -1;
 365                 lun = 0;
 366                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 367                         id  = dt_id[elem];
 368                         lun = dt_lun[elem];
 369                         vprintk("dt 0x%x: [insmod option] ",
 370                                 elem+ch->firsts[CHET_DT]);
 371                 } else if (0 != ch_read_element_status
 372                            (ch,elem+ch->firsts[CHET_DT],data)) {
 373                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 374                                 elem+ch->firsts[CHET_DT]);
 375                 } else {
 376                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 377                         if (data[6] & 0x80) {
 378                                 if (verbose)
 379                                         printk("not this SCSI bus\n");
 380                                 ch->dt[elem] = NULL;
 381                         } else if (0 == (data[6] & 0x30)) {
 382                                 if (verbose)
 383                                         printk("ID/LUN unknown\n");
 384                                 ch->dt[elem] = NULL;
 385                         } else {
 386                                 id  = ch->device->id;
 387                                 lun = 0;
 388                                 if (data[6] & 0x20) id  = data[7];
 389                                 if (data[6] & 0x10) lun = data[6] & 7;
 390                         }
 391                 }
 392                 if (-1 != id) {
 393                         if (verbose)
 394                                 printk("ID %i, LUN %i, ",id,lun);
 395                         ch->dt[elem] =
 396                                 scsi_device_lookup(ch->device->host,
 397                                                    ch->device->channel,
 398                                                    id,lun);
 399                         if (!ch->dt[elem]) {
 400                                 /* should not happen */
 401                                 if (verbose)
 402                                         printk("Huh? device not found!\n");
 403                         } else {
 404                                 if (verbose)
 405                                         printk("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 << 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, 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 << 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, 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 << 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, 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 << 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, 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("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 int
 568 ch_release(struct inode *inode, struct file *file)
 569 {
 570         scsi_changer *ch = file->private_data;
 571
 572         scsi_device_put(ch->device);
 573         file->private_data = NULL;
 574         return 0;
 575 }
 576
 577 static int
 578 ch_open(struct inode *inode, struct file *file)
 579 {
 580         scsi_changer *ch;
 581         int minor = iminor(inode);
 582
 583         lock_kernel();
 584         spin_lock(&ch_index_lock);
 585         ch = idr_find(&ch_index_idr, minor);
 586
 587         if (NULL == ch || scsi_device_get(ch->device)) {
 588                 spin_unlock(&ch_index_lock);
 589                 unlock_kernel();
 590                 return -ENXIO;
 591         }
 592         spin_unlock(&ch_index_lock);
 593
 594         file->private_data = ch;
 595         unlock_kernel();
 596         return 0;
 597 }
 598
 599 static int
 600 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 601 {
 602         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 603                 return -1;
 604         return 0;
 605 }
 606
 607 static long ch_ioctl(struct file *file,
 608                     unsigned int cmd, unsigned long arg)
 609 {
 610         scsi_changer *ch = file->private_data;
 611         int retval;
 612         void __user *argp = (void __user *)arg;
 613
 614         switch (cmd) {
 615         case CHIOGPARAMS:
 616         {
 617                 struct changer_params params;
 618
 619                 params.cp_curpicker = 0;
 620                 params.cp_npickers  = ch->counts[CHET_MT];
 621                 params.cp_nslots    = ch->counts[CHET_ST];
 622                 params.cp_nportals  = ch->counts[CHET_IE];
 623                 params.cp_ndrives   = ch->counts[CHET_DT];
 624
 625                 if (copy_to_user(argp, &params, sizeof(params)))
 626                         return -EFAULT;
 627                 return 0;
 628         }
 629         case CHIOGVPARAMS:
 630         {
 631                 struct changer_vendor_params vparams;
 632
 633                 memset(&vparams,0,sizeof(vparams));
 634                 if (ch->counts[CHET_V1]) {
 635                         vparams.cvp_n1  = ch->counts[CHET_V1];
 636                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 637                 }
 638                 if (ch->counts[CHET_V2]) {
 639                         vparams.cvp_n2  = ch->counts[CHET_V2];
 640                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 641                 }
 642                 if (ch->counts[CHET_V3]) {
 643                         vparams.cvp_n3  = ch->counts[CHET_V3];
 644                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 645                 }
 646                 if (ch->counts[CHET_V4]) {
 647                         vparams.cvp_n4  = ch->counts[CHET_V4];
 648                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 649                 }
 650                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 651                         return -EFAULT;
 652                 return 0;
 653         }
 654
 655         case CHIOPOSITION:
 656         {
 657                 struct changer_position pos;
 658
 659                 if (copy_from_user(&pos, argp, sizeof (pos)))
 660                         return -EFAULT;
 661
 662                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 663                         dprintk("CHIOPOSITION: invalid parameter\n");
 664                         return -EBADSLT;
 665                 }
 666                 mutex_lock(&ch->lock);
 667                 retval = ch_position(ch,0,
 668                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 669                                      pos.cp_flags & CP_INVERT);
 670                 mutex_unlock(&ch->lock);
 671                 return retval;
 672         }
 673
 674         case CHIOMOVE:
 675         {
 676                 struct changer_move mv;
 677
 678                 if (copy_from_user(&mv, argp, sizeof (mv)))
 679                         return -EFAULT;
 680
 681                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 682                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 683                         dprintk("CHIOMOVE: invalid parameter\n");
 684                         return -EBADSLT;
 685                 }
 686
 687                 mutex_lock(&ch->lock);
 688                 retval = ch_move(ch,0,
 689                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 690                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 691                                  mv.cm_flags & CM_INVERT);
 692                 mutex_unlock(&ch->lock);
 693                 return retval;
 694         }
 695
 696         case CHIOEXCHANGE:
 697         {
 698                 struct changer_exchange mv;
 699
 700                 if (copy_from_user(&mv, argp, sizeof (mv)))
 701                         return -EFAULT;
 702
 703                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 704                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 705                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 706                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 707                         return -EBADSLT;
 708                 }
 709
 710                 mutex_lock(&ch->lock);
 711                 retval = ch_exchange
 712                         (ch,0,
 713                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 714                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 715                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 716                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 717                 mutex_unlock(&ch->lock);
 718                 return retval;
 719         }
 720
 721         case CHIOGSTATUS:
 722         {
 723                 struct changer_element_status ces;
 724
 725                 if (copy_from_user(&ces, argp, sizeof (ces)))
 726                         return -EFAULT;
 727                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 728                         return -EINVAL;
 729
 730                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 731         }
 732
 733         case CHIOGELEM:
 734         {
 735                 struct changer_get_element cge;
 736                 u_char ch_cmd[12];
 737                 u_char *buffer;
 738                 unsigned int elem;
 739                 int     result,i;
 740
 741                 if (copy_from_user(&cge, argp, sizeof (cge)))
 742                         return -EFAULT;
 743
 744                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 745                         return -EINVAL;
 746                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 747
 748                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 749                 if (!buffer)
 750                         return -ENOMEM;
 751                 mutex_lock(&ch->lock);
 752
 753         voltag_retry:
 754                 memset(ch_cmd, 0, sizeof(ch_cmd));
 755                 ch_cmd[0] = READ_ELEMENT_STATUS;
 756                 ch_cmd[1] = (ch->device->lun << 5) |
 757                         (ch->voltags ? 0x10 : 0) |
 758                         ch_elem_to_typecode(ch,elem);
 759                 ch_cmd[2] = (elem >> 8) & 0xff;
 760                 ch_cmd[3] = elem        & 0xff;
 761                 ch_cmd[5] = 1;
 762                 ch_cmd[9] = 255;
 763
 764                 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
 765                 if (!result) {
 766                         cge.cge_status = buffer[18];
 767                         cge.cge_flags = 0;
 768                         if (buffer[18] & CESTATUS_EXCEPT) {
 769                                 cge.cge_errno = EIO;
 770                         }
 771                         if (buffer[25] & 0x80) {
 772                                 cge.cge_flags |= CGE_SRC;
 773                                 if (buffer[25] & 0x40)
 774                                         cge.cge_flags |= CGE_INVERT;
 775                                 elem = (buffer[26]<<8) | buffer[27];
 776                                 for (i = 0; i < 4; i++) {
 777                                         if (elem >= ch->firsts[i] &&
 778                                             elem <  ch->firsts[i] + ch->counts[i]) {
 779                                                 cge.cge_srctype = i;
 780                                                 cge.cge_srcunit = elem-ch->firsts[i];
 781                                         }
 782                                 }
 783                         }
 784                         if ((buffer[22] & 0x30) == 0x30) {
 785                                 cge.cge_flags |= CGE_IDLUN;
 786                                 cge.cge_id  = buffer[23];
 787                                 cge.cge_lun = buffer[22] & 7;
 788                         }
 789                         if (buffer[9] & 0x80) {
 790                                 cge.cge_flags |= CGE_PVOLTAG;
 791                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 792                         }
 793                         if (buffer[9] & 0x40) {
 794                                 cge.cge_flags |= CGE_AVOLTAG;
 795                                 memcpy(cge.cge_avoltag,buffer+64,36);
 796                         }
 797                 } else if (ch->voltags) {
 798                         ch->voltags = 0;
 799                         vprintk("device has no volume tag support\n");
 800                         goto voltag_retry;
 801                 }
 802                 kfree(buffer);
 803                 mutex_unlock(&ch->lock);
 804
 805                 if (copy_to_user(argp, &cge, sizeof (cge)))
 806                         return -EFAULT;
 807                 return result;
 808         }
 809
 810         case CHIOINITELEM:
 811         {
 812                 mutex_lock(&ch->lock);
 813                 retval = ch_init_elem(ch);
 814                 mutex_unlock(&ch->lock);
 815                 return retval;
 816         }
 817
 818         case CHIOSVOLTAG:
 819         {
 820                 struct changer_set_voltag csv;
 821                 int elem;
 822
 823                 if (copy_from_user(&csv, argp, sizeof(csv)))
 824                         return -EFAULT;
 825
 826                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 827                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 828                         return -EBADSLT;
 829                 }
 830                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 831                 mutex_lock(&ch->lock);
 832                 retval = ch_set_voltag(ch, elem,
 833                                        csv.csv_flags & CSV_AVOLTAG,
 834                                        csv.csv_flags & CSV_CLEARTAG,
 835                                        csv.csv_voltag);
 836                 mutex_unlock(&ch->lock);
 837                 return retval;
 838         }
 839
 840         default:
 841                 return scsi_ioctl(ch->device, cmd, argp);
 842
 843         }
 844 }
 845
 846 #ifdef CONFIG_COMPAT
 847
 848 struct changer_element_status32 {
 849         int             ces_type;
 850         compat_uptr_t   ces_data;
 851 };
 852 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 853
 854 static long ch_ioctl_compat(struct file * file,
 855                             unsigned int cmd, unsigned long arg)
 856 {
 857         scsi_changer *ch = file->private_data;
 858
 859         switch (cmd) {
 860         case CHIOGPARAMS:
 861         case CHIOGVPARAMS:
 862         case CHIOPOSITION:
 863         case CHIOMOVE:
 864         case CHIOEXCHANGE:
 865         case CHIOGELEM:
 866         case CHIOINITELEM:
 867         case CHIOSVOLTAG:
 868                 /* compatible */
 869                 return ch_ioctl(file, cmd, arg);
 870         case CHIOGSTATUS32:
 871         {
 872                 struct changer_element_status32 ces32;
 873                 unsigned char __user *data;
 874
 875                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 876                         return -EFAULT;
 877                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 878                         return -EINVAL;
 879
 880                 data = compat_ptr(ces32.ces_data);
 881                 return ch_gstatus(ch, ces32.ces_type, data);
 882         }
 883         default:
 884                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 885                 return -ENOIOCTLCMD;
 886
 887         }
 888 }
 889 #endif
 890
 891 /* ------------------------------------------------------------------------ */
 892
 893 static int ch_probe(struct device *dev)
 894 {
 895         struct scsi_device *sd = to_scsi_device(dev);
 896         struct device *class_dev;
 897         int minor, ret = -ENOMEM;
 898         scsi_changer *ch;
 899
 900         if (sd->type != TYPE_MEDIUM_CHANGER)
 901                 return -ENODEV;
 902
 903         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 904         if (NULL == ch)
 905                 return -ENOMEM;
 906
 907         if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
 908                 goto free_ch;
 909
 910         spin_lock(&ch_index_lock);
 911         ret = idr_get_new(&ch_index_idr, ch, &minor);
 912         spin_unlock(&ch_index_lock);
 913
 914         if (ret)
 915                 goto free_ch;
 916
 917         if (minor > CH_MAX_DEVS) {
 918                 ret = -ENODEV;
 919                 goto remove_idr;
 920         }
 921
 922         ch->minor = minor;
 923         sprintf(ch->name,"ch%d",ch->minor);
 924
 925         class_dev = device_create(ch_sysfs_class, dev,
 926                                   MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
 927                                   "s%s", ch->name);
 928         if (IS_ERR(class_dev)) {
 929                 printk(KERN_WARNING "ch%d: device_create failed\n",
 930                        ch->minor);
 931                 ret = PTR_ERR(class_dev);
 932                 goto remove_idr;
 933         }
 934
 935         mutex_init(&ch->lock);
 936         ch->device = sd;
 937         ch_readconfig(ch);
 938         if (init)
 939                 ch_init_elem(ch);
 940
 941         dev_set_drvdata(dev, ch);
 942         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 943
 944         return 0;
 945 remove_idr:
 946         idr_remove(&ch_index_idr, minor);
 947 free_ch:
 948         kfree(ch);
 949         return ret;
 950 }
 951
 952 static int ch_remove(struct device *dev)
 953 {
 954         scsi_changer *ch = dev_get_drvdata(dev);
 955
 956         spin_lock(&ch_index_lock);
 957         idr_remove(&ch_index_idr, ch->minor);
 958         spin_unlock(&ch_index_lock);
 959
 960         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 961         kfree(ch->dt);
 962         kfree(ch);
 963         return 0;
 964 }
 965
 966 static struct scsi_driver ch_template = {
 967         .owner          = THIS_MODULE,
 968         .gendrv         = {
 969                 .name   = "ch",
 970                 .probe  = ch_probe,
 971                 .remove = ch_remove,
 972         },
 973 };
 974
 975 static const struct file_operations changer_fops = {
 976         .owner          = THIS_MODULE,
 977         .open           = ch_open,
 978         .release        = ch_release,
 979         .unlocked_ioctl = ch_ioctl,
 980 #ifdef CONFIG_COMPAT
 981         .compat_ioctl   = ch_ioctl_compat,
 982 #endif
 983 };
 984
 985 static int __init init_ch_module(void)
 986 {
 987         int rc;
 988
 989         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 990         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 991         if (IS_ERR(ch_sysfs_class)) {
 992                 rc = PTR_ERR(ch_sysfs_class);
 993                 return rc;
 994         }
 995         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 996         if (rc < 0) {
 997                 printk("Unable to get major %d for SCSI-Changer\n",
 998                        SCSI_CHANGER_MAJOR);
 999                 goto fail1;
1000         }
1001         rc = scsi_register_driver(&ch_template.gendrv);
1002         if (rc < 0)
1003                 goto fail2;
1004         return 0;
1005
1006  fail2:
1007         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1008  fail1:
1009         class_destroy(ch_sysfs_class);
1010         return rc;
1011 }
1012
1013 static void __exit exit_ch_module(void)
1014 {
1015         scsi_unregister_driver(&ch_template.gendrv);
1016         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1017         class_destroy(ch_sysfs_class);
1018         idr_destroy(&ch_index_idr);
1019 }
1020
1021 module_init(init_ch_module);
1022 module_exit(exit_ch_module);
1023
1024 /*
1025  * Local variables:
1026  * c-basic-offset: 8
1027  * End:
1028  */