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