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