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