git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/mm.h>
  17 #include <linux/major.h>
  18 #include <linux/string.h>
  19 #include <linux/errno.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/completion.h>
  23 #include <linux/devfs_fs_kernel.h>
  24 #include <linux/ioctl32.h>
  25 #include <linux/compat.h>
  26 #include <linux/chio.h>                 /* here are all the ioctls */
  27
  28 #include <scsi/scsi.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <scsi/scsi_driver.h>
  31 #include <scsi/scsi_ioctl.h>
  32 #include <scsi/scsi_host.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_request.h>
  35 #include <scsi/scsi_dbg.h>
  36
  37 #define CH_DT_MAX       16
  38 #define CH_TYPES        8
  39
  40 MODULE_DESCRIPTION("device driver for scsi media changer devices");
  41 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
  42 MODULE_LICENSE("GPL");
  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 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 int  ch_probe(struct device *);
  94 static int  ch_remove(struct device *);
  95 static int  ch_open(struct inode * inode, struct file * filp);
  96 static int  ch_release(struct inode * inode, struct file * filp);
  97 static int  ch_ioctl(struct inode * inode, struct file * filp,
  98                      unsigned int cmd, unsigned long arg);
  99 #ifdef CONFIG_COMPAT
 100 static long ch_ioctl_compat(struct file * filp,
 101                             unsigned int cmd, unsigned long arg);
 102 #endif
 103
 104 static struct class * ch_sysfs_class;
 105
 106 typedef struct {
 107         struct list_head    list;
 108         int                 minor;
 109         char                name[8];
 110         struct scsi_device  *device;
 111         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 112         u_int               firsts[CH_TYPES];
 113         u_int               counts[CH_TYPES];
 114         u_int               unit_attention;
 115         u_int               voltags;
 116         struct semaphore    lock;
 117 } scsi_changer;
 118
 119 static LIST_HEAD(ch_devlist);
 120 static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED;
 121 static int ch_devcount;
 122
 123 static struct scsi_driver ch_template =
 124 {
 125         .owner          = THIS_MODULE,
 126         .gendrv         = {
 127                 .name   = "ch",
 128                 .probe  = ch_probe,
 129                 .remove = ch_remove,
 130         },
 131 };
 132
 133 static struct file_operations changer_fops =
 134 {
 135         .owner        = THIS_MODULE,
 136         .open         = ch_open,
 137         .release      = ch_release,
 138         .ioctl        = ch_ioctl,
 139 #ifdef CONFIG_COMPAT
 140         .compat_ioctl = ch_ioctl_compat,
 141 #endif
 142 };
 143
 144 static struct {
 145         unsigned char  sense;
 146         unsigned char  asc;
 147         unsigned char  ascq;
 148         int            errno;
 149 } err[] = {
 150 /* Just filled in what looks right. Hav'nt checked any standard paper for
 151    these errno assignments, so they may be wrong... */
 152         {
 153                 .sense  = ILLEGAL_REQUEST,
 154                 .asc    = 0x21,
 155                 .ascq   = 0x01,
 156                 .errno  = EBADSLT, /* Invalid element address */
 157         },{
 158                 .sense  = ILLEGAL_REQUEST,
 159                 .asc    = 0x28,
 160                 .ascq   = 0x01,
 161                 .errno  = EBADE,   /* Import or export element accessed */
 162         },{
 163                 .sense  = ILLEGAL_REQUEST,
 164                 .asc    = 0x3B,
 165                 .ascq   = 0x0D,
 166                 .errno  = EXFULL,  /* Medium destination element full */
 167         },{
 168                 .sense  = ILLEGAL_REQUEST,
 169                 .asc    = 0x3B,
 170                 .ascq   = 0x0E,
 171                 .errno  = EBADE,   /* Medium source element empty */
 172         },{
 173                 .sense  = ILLEGAL_REQUEST,
 174                 .asc    = 0x20,
 175                 .ascq   = 0x00,
 176                 .errno  = EBADRQC, /* Invalid command operation code */
 177         },{
 178                 /* end of list */
 179         }
 180 };
 181
 182 /* ------------------------------------------------------------------- */
 183
 184 static int ch_find_errno(unsigned char *sense_buffer)
 185 {
 186         int i,errno = 0;
 187
 188         /* Check to see if additional sense information is available */
 189         if (sense_buffer[7]  > 5 &&
 190             sense_buffer[12] != 0) {
 191                 for (i = 0; err[i].errno != 0; i++) {
 192                         if (err[i].sense == sense_buffer[ 2] &&
 193                             err[i].asc   == sense_buffer[12] &&
 194                             err[i].ascq  == sense_buffer[13]) {
 195                                 errno = -err[i].errno;
 196                                 break;
 197                         }
 198                 }
 199         }
 200         if (errno == 0)
 201                 errno = -EIO;
 202         return errno;
 203 }
 204
 205 static int
 206 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 207            void *buffer, unsigned buflength,
 208            enum dma_data_direction direction)
 209 {
 210         int errno, retries = 0, timeout;
 211         struct scsi_request *sr;
 212
 213         sr = scsi_allocate_request(ch->device, GFP_KERNEL);
 214         if (NULL == sr)
 215                 return -ENOMEM;
 216
 217         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 218                 ? timeout_init : timeout_move;
 219
 220  retry:
 221         errno = 0;
 222         if (debug) {
 223                 dprintk("command: ");
 224                 __scsi_print_command(cmd);
 225         }
 226
 227         scsi_wait_req(sr, cmd, buffer, buflength,
 228                       timeout * HZ, MAX_RETRIES);
 229
 230         dprintk("result: 0x%x\n",sr->sr_result);
 231         if (driver_byte(sr->sr_result) & DRIVER_SENSE) {
 232                 if (debug)
 233                         scsi_print_req_sense(ch->name, sr);
 234                 errno = ch_find_errno(sr->sr_sense_buffer);
 235
 236                 switch(sr->sr_sense_buffer[2] & 0xf) {
 237                 case UNIT_ATTENTION:
 238                         ch->unit_attention = 1;
 239                         if (retries++ < 3)
 240                                 goto retry;
 241                         break;
 242                 }
 243         }
 244         scsi_release_request(sr);
 245         return errno;
 246 }
 247
 248 /* ------------------------------------------------------------------------ */
 249
 250 static int
 251 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 252 {
 253         int i;
 254
 255         for (i = 0; i < CH_TYPES; i++) {
 256                 if (elem >= ch->firsts[i]  &&
 257                     elem <  ch->firsts[i] +
 258                     ch->counts[i])
 259                         return i+1;
 260         }
 261         return 0;
 262 }
 263
 264 static int
 265 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 266 {
 267         u_char  cmd[12];
 268         u_char  *buffer;
 269         int     result;
 270
 271         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 272         if(!buffer)
 273                 return -ENOMEM;
 274
 275  retry:
 276         memset(cmd,0,sizeof(cmd));
 277         cmd[0] = READ_ELEMENT_STATUS;
 278         cmd[1] = (ch->device->lun << 5) |
 279                 (ch->voltags ? 0x10 : 0) |
 280                 ch_elem_to_typecode(ch,elem);
 281         cmd[2] = (elem >> 8) & 0xff;
 282         cmd[3] = elem        & 0xff;
 283         cmd[5] = 1;
 284         cmd[9] = 255;
 285         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 286                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 287                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 288                                 elem,(buffer[16] << 8) | buffer[17]);
 289                         kfree(buffer);
 290                         return -EIO;
 291                 }
 292                 memcpy(data,buffer+16,16);
 293         } else {
 294                 if (ch->voltags) {
 295                         ch->voltags = 0;
 296                         vprintk("device has no volume tag support\n");
 297                         goto retry;
 298                 }
 299                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 300         }
 301         kfree(buffer);
 302         return result;
 303 }
 304
 305 static int
 306 ch_init_elem(scsi_changer *ch)
 307 {
 308         int err;
 309         u_char cmd[6];
 310
 311         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 312         memset(cmd,0,sizeof(cmd));
 313         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 314         cmd[1] = ch->device->lun << 5;
 315         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 316         vprintk("... finished\n");
 317         return err;
 318 }
 319
 320 static int
 321 ch_readconfig(scsi_changer *ch)
 322 {
 323         u_char  cmd[10], data[16];
 324         u_char  *buffer;
 325         int     result,id,lun,i;
 326         u_int   elem;
 327
 328         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 329         if (!buffer)
 330                 return -ENOMEM;
 331         memset(buffer,0,512);
 332
 333         memset(cmd,0,sizeof(cmd));
 334         cmd[0] = MODE_SENSE;
 335         cmd[1] = ch->device->lun << 5;
 336         cmd[2] = 0x1d;
 337         cmd[4] = 255;
 338         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 339         if (0 != result) {
 340                 cmd[1] |= (1<<3);
 341                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 342         }
 343         if (0 == result) {
 344                 ch->firsts[CHET_MT] =
 345                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 346                 ch->counts[CHET_MT] =
 347                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 348                 ch->firsts[CHET_ST] =
 349                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 350                 ch->counts[CHET_ST] =
 351                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 352                 ch->firsts[CHET_IE] =
 353                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 354                 ch->counts[CHET_IE] =
 355                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 356                 ch->firsts[CHET_DT] =
 357                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 358                 ch->counts[CHET_DT] =
 359                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 360                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 361                         ch->firsts[CHET_MT],
 362                         ch->counts[CHET_MT]);
 363                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 364                         ch->firsts[CHET_ST],
 365                         ch->counts[CHET_ST]);
 366                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 367                         ch->firsts[CHET_IE],
 368                         ch->counts[CHET_IE]);
 369                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 370                         ch->firsts[CHET_DT],
 371                         ch->counts[CHET_DT]);
 372         } else {
 373                 vprintk("reading element address assigment page failed!\n");
 374         }
 375
 376         /* vendor specific element types */
 377         for (i = 0; i < 4; i++) {
 378                 if (0 == vendor_counts[i])
 379                         continue;
 380                 if (NULL == vendor_labels[i])
 381                         continue;
 382                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 383                 ch->counts[CHET_V1+i] = vendor_counts[i];
 384                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 385                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 386                         vendor_labels[i]);
 387         }
 388
 389         /* look up the devices of the data transfer elements */
 390         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 391                          GFP_KERNEL);
 392         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 393                 id  = -1;
 394                 lun = 0;
 395                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 396                         id  = dt_id[elem];
 397                         lun = dt_lun[elem];
 398                         vprintk("dt 0x%x: [insmod option] ",
 399                                 elem+ch->firsts[CHET_DT]);
 400                 } else if (0 != ch_read_element_status
 401                            (ch,elem+ch->firsts[CHET_DT],data)) {
 402                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 403                                 elem+ch->firsts[CHET_DT]);
 404                 } else {
 405                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 406                         if (data[6] & 0x80) {
 407                                 if (verbose)
 408                                         printk("not this SCSI bus\n");
 409                                 ch->dt[elem] = NULL;
 410                         } else if (0 == (data[6] & 0x30)) {
 411                                 if (verbose)
 412                                         printk("ID/LUN unknown\n");
 413                                 ch->dt[elem] = NULL;
 414                         } else {
 415                                 id  = ch->device->id;
 416                                 lun = 0;
 417                                 if (data[6] & 0x20) id  = data[7];
 418                                 if (data[6] & 0x10) lun = data[6] & 7;
 419                         }
 420                 }
 421                 if (-1 != id) {
 422                         if (verbose)
 423                                 printk("ID %i, LUN %i, ",id,lun);
 424                         ch->dt[elem] =
 425                                 scsi_device_lookup(ch->device->host,
 426                                                    ch->device->channel,
 427                                                    id,lun);
 428                         if (!ch->dt[elem]) {
 429                                 /* should not happen */
 430                                 if (verbose)
 431                                         printk("Huh? device not found!\n");
 432                         } else {
 433                                 if (verbose)
 434                                         printk("name: %8.8s %16.16s %4.4s\n",
 435                                                ch->dt[elem]->vendor,
 436                                                ch->dt[elem]->model,
 437                                                ch->dt[elem]->rev);
 438                         }
 439                 }
 440         }
 441         ch->voltags = 1;
 442         kfree(buffer);
 443
 444         return 0;
 445 }
 446
 447 /* ------------------------------------------------------------------------ */
 448
 449 static int
 450 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 451 {
 452         u_char  cmd[10];
 453
 454         dprintk("position: 0x%x\n",elem);
 455         if (0 == trans)
 456                 trans = ch->firsts[CHET_MT];
 457         memset(cmd,0,sizeof(cmd));
 458         cmd[0]  = POSITION_TO_ELEMENT;
 459         cmd[1]  = ch->device->lun << 5;
 460         cmd[2]  = (trans >> 8) & 0xff;
 461         cmd[3]  =  trans       & 0xff;
 462         cmd[4]  = (elem  >> 8) & 0xff;
 463         cmd[5]  =  elem        & 0xff;
 464         cmd[8]  = rotate ? 1 : 0;
 465         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 466 }
 467
 468 static int
 469 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 470 {
 471         u_char  cmd[12];
 472
 473         dprintk("move: 0x%x => 0x%x\n",src,dest);
 474         if (0 == trans)
 475                 trans = ch->firsts[CHET_MT];
 476         memset(cmd,0,sizeof(cmd));
 477         cmd[0]  = MOVE_MEDIUM;
 478         cmd[1]  = ch->device->lun << 5;
 479         cmd[2]  = (trans >> 8) & 0xff;
 480         cmd[3]  =  trans       & 0xff;
 481         cmd[4]  = (src   >> 8) & 0xff;
 482         cmd[5]  =  src         & 0xff;
 483         cmd[6]  = (dest  >> 8) & 0xff;
 484         cmd[7]  =  dest        & 0xff;
 485         cmd[10] = rotate ? 1 : 0;
 486         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 487 }
 488
 489 static int
 490 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 491             u_int dest1, u_int dest2, int rotate1, int rotate2)
 492 {
 493         u_char  cmd[12];
 494
 495         dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
 496                 src,dest1,dest2);
 497         if (0 == trans)
 498                 trans = ch->firsts[CHET_MT];
 499         memset(cmd,0,sizeof(cmd));
 500         cmd[0]  = EXCHANGE_MEDIUM;
 501         cmd[1]  = ch->device->lun << 5;
 502         cmd[2]  = (trans >> 8) & 0xff;
 503         cmd[3]  =  trans       & 0xff;
 504         cmd[4]  = (src   >> 8) & 0xff;
 505         cmd[5]  =  src         & 0xff;
 506         cmd[6]  = (dest1 >> 8) & 0xff;
 507         cmd[7]  =  dest1       & 0xff;
 508         cmd[8]  = (dest2 >> 8) & 0xff;
 509         cmd[9]  =  dest2       & 0xff;
 510         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 511
 512         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 513 }
 514
 515 static void
 516 ch_check_voltag(char *tag)
 517 {
 518         int i;
 519
 520         for (i = 0; i < 32; i++) {
 521                 /* restrict to ascii */
 522                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 523                         tag[i] = ' ';
 524                 /* don't allow search wildcards */
 525                 if (tag[i] == '?' ||
 526                     tag[i] == '*')
 527                         tag[i] = ' ';
 528         }
 529 }
 530
 531 static int
 532 ch_set_voltag(scsi_changer *ch, u_int elem,
 533               int alternate, int clear, u_char *tag)
 534 {
 535         u_char  cmd[12];
 536         u_char  *buffer;
 537         int result;
 538
 539         buffer = kmalloc(512, GFP_KERNEL);
 540         if (!buffer)
 541                 return -ENOMEM;
 542         memset(buffer,0,512);
 543
 544         dprintk("%s %s voltag: 0x%x => \"%s\"\n",
 545                 clear     ? "clear"     : "set",
 546                 alternate ? "alternate" : "primary",
 547                 elem, tag);
 548         memset(cmd,0,sizeof(cmd));
 549         cmd[0]  = SEND_VOLUME_TAG;
 550         cmd[1] = (ch->device->lun << 5) |
 551                 ch_elem_to_typecode(ch,elem);
 552         cmd[2] = (elem >> 8) & 0xff;
 553         cmd[3] = elem        & 0xff;
 554         cmd[5] = clear
 555                 ? (alternate ? 0x0d : 0x0c)
 556                 : (alternate ? 0x0b : 0x0a);
 557
 558         cmd[9] = 255;
 559
 560         memcpy(buffer,tag,32);
 561         ch_check_voltag(buffer);
 562
 563         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 564         kfree(buffer);
 565         return result;
 566 }
 567
 568 static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest)
 569 {
 570         int retval = 0;
 571         u_char data[16];
 572         unsigned int i;
 573
 574         down(&ch->lock);
 575         for (i = 0; i < ch->counts[type]; i++) {
 576                 if (0 != ch_read_element_status
 577                     (ch, ch->firsts[type]+i,data)) {
 578                         retval = -EIO;
 579                         break;
 580                 }
 581                 put_user(data[2], dest+i);
 582                 if (data[2] & CESTATUS_EXCEPT)
 583                         vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
 584                                 ch->firsts[type]+i,
 585                                 (int)data[4],(int)data[5]);
 586                 retval = ch_read_element_status
 587                         (ch, ch->firsts[type]+i,data);
 588                 if (0 != retval)
 589                         break;
 590         }
 591         up(&ch->lock);
 592         return retval;
 593 }
 594
 595 /* ------------------------------------------------------------------------ */
 596
 597 static int
 598 ch_release(struct inode *inode, struct file *file)
 599 {
 600         scsi_changer *ch = file->private_data;
 601
 602         scsi_device_put(ch->device);
 603         file->private_data = NULL;
 604         return 0;
 605 }
 606
 607 static int
 608 ch_open(struct inode *inode, struct file *file)
 609 {
 610         scsi_changer *tmp, *ch;
 611         int minor = iminor(inode);
 612
 613         spin_lock(&ch_devlist_lock);
 614         ch = NULL;
 615         list_for_each_entry(tmp,&ch_devlist,list) {
 616                 if (tmp->minor == minor)
 617                         ch = tmp;
 618         }
 619         if (NULL == ch || scsi_device_get(ch->device)) {
 620                 spin_unlock(&ch_devlist_lock);
 621                 return -ENXIO;
 622         }
 623         spin_unlock(&ch_devlist_lock);
 624
 625         file->private_data = ch;
 626         return 0;
 627 }
 628
 629 static int
 630 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 631 {
 632         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 633                 return -1;
 634         return 0;
 635 }
 636
 637 static int ch_ioctl(struct inode * inode, struct file * file,
 638                     unsigned int cmd, unsigned long arg)
 639 {
 640         scsi_changer *ch = file->private_data;
 641         int retval;
 642
 643         switch (cmd) {
 644         case CHIOGPARAMS:
 645         {
 646                 struct changer_params params;
 647
 648                 params.cp_curpicker = 0;
 649                 params.cp_npickers  = ch->counts[CHET_MT];
 650                 params.cp_nslots    = ch->counts[CHET_ST];
 651                 params.cp_nportals  = ch->counts[CHET_IE];
 652                 params.cp_ndrives   = ch->counts[CHET_DT];
 653
 654                 if (copy_to_user((void *) arg, &params, sizeof(params)))
 655                         return -EFAULT;
 656                 return 0;
 657         }
 658         case CHIOGVPARAMS:
 659         {
 660                 struct changer_vendor_params vparams;
 661
 662                 memset(&vparams,0,sizeof(vparams));
 663                 if (ch->counts[CHET_V1]) {
 664                         vparams.cvp_n1  = ch->counts[CHET_V1];
 665                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 666                 }
 667                 if (ch->counts[CHET_V2]) {
 668                         vparams.cvp_n2  = ch->counts[CHET_V2];
 669                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 670                 }
 671                 if (ch->counts[CHET_V3]) {
 672                         vparams.cvp_n3  = ch->counts[CHET_V3];
 673                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 674                 }
 675                 if (ch->counts[CHET_V4]) {
 676                         vparams.cvp_n4  = ch->counts[CHET_V4];
 677                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 678                 }
 679                 if (copy_to_user((void *) arg, &vparams, sizeof(vparams)))
 680                         return -EFAULT;
 681                 return 0;
 682         }
 683
 684         case CHIOPOSITION:
 685         {
 686                 struct changer_position pos;
 687
 688                 if (copy_from_user(&pos, (void*)arg, sizeof (pos)))
 689                         return -EFAULT;
 690
 691                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 692                         dprintk("CHIOPOSITION: invalid parameter\n");
 693                         return -EBADSLT;
 694                 }
 695                 down(&ch->lock);
 696                 retval = ch_position(ch,0,
 697                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 698                                      pos.cp_flags & CP_INVERT);
 699                 up(&ch->lock);
 700                 return retval;
 701         }
 702
 703         case CHIOMOVE:
 704         {
 705                 struct changer_move mv;
 706
 707                 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
 708                         return -EFAULT;
 709
 710                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 711                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 712                         dprintk("CHIOMOVE: invalid parameter\n");
 713                         return -EBADSLT;
 714                 }
 715
 716                 down(&ch->lock);
 717                 retval = ch_move(ch,0,
 718                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 719                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 720                                  mv.cm_flags & CM_INVERT);
 721                 up(&ch->lock);
 722                 return retval;
 723         }
 724
 725         case CHIOEXCHANGE:
 726         {
 727                 struct changer_exchange mv;
 728
 729                 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
 730                         return -EFAULT;
 731
 732                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 733                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 734                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 735                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 736                         return -EBADSLT;
 737                 }
 738
 739                 down(&ch->lock);
 740                 retval = ch_exchange
 741                         (ch,0,
 742                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 743                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 744                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 745                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 746                 up(&ch->lock);
 747                 return retval;
 748         }
 749
 750         case CHIOGSTATUS:
 751         {
 752                 struct changer_element_status ces;
 753
 754                 if (copy_from_user(&ces, (void*)arg, sizeof (ces)))
 755                         return -EFAULT;
 756                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 757                         return -EINVAL;
 758
 759                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 760         }
 761
 762         case CHIOGELEM:
 763         {
 764                 struct changer_get_element cge;
 765                 u_char  cmd[12];
 766                 u_char  *buffer;
 767                 unsigned int elem;
 768                 int     result,i;
 769
 770                 if (copy_from_user(&cge, (void*)arg, sizeof (cge)))
 771                         return -EFAULT;
 772
 773                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 774                         return -EINVAL;
 775                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 776
 777                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 778                 if (!buffer)
 779                         return -ENOMEM;
 780                 down(&ch->lock);
 781
 782         voltag_retry:
 783                 memset(cmd,0,sizeof(cmd));
 784                 cmd[0] = READ_ELEMENT_STATUS;
 785                 cmd[1] = (ch->device->lun << 5) |
 786                         (ch->voltags ? 0x10 : 0) |
 787                         ch_elem_to_typecode(ch,elem);
 788                 cmd[2] = (elem >> 8) & 0xff;
 789                 cmd[3] = elem        & 0xff;
 790                 cmd[5] = 1;
 791                 cmd[9] = 255;
 792
 793                 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 794                         cge.cge_status = buffer[18];
 795                         cge.cge_flags = 0;
 796                         if (buffer[18] & CESTATUS_EXCEPT) {
 797                                 cge.cge_errno = EIO;
 798                         }
 799                         if (buffer[25] & 0x80) {
 800                                 cge.cge_flags |= CGE_SRC;
 801                                 if (buffer[25] & 0x40)
 802                                         cge.cge_flags |= CGE_INVERT;
 803                                 elem = (buffer[26]<<8) | buffer[27];
 804                                 for (i = 0; i < 4; i++) {
 805                                         if (elem >= ch->firsts[i] &&
 806                                             elem <  ch->firsts[i] + ch->counts[i]) {
 807                                                 cge.cge_srctype = i;
 808                                                 cge.cge_srcunit = elem-ch->firsts[i];
 809                                         }
 810                                 }
 811                         }
 812                         if ((buffer[22] & 0x30) == 0x30) {
 813                                 cge.cge_flags |= CGE_IDLUN;
 814                                 cge.cge_id  = buffer[23];
 815                                 cge.cge_lun = buffer[22] & 7;
 816                         }
 817                         if (buffer[9] & 0x80) {
 818                                 cge.cge_flags |= CGE_PVOLTAG;
 819                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 820                         }
 821                         if (buffer[9] & 0x40) {
 822                                 cge.cge_flags |= CGE_AVOLTAG;
 823                                 memcpy(cge.cge_avoltag,buffer+64,36);
 824                         }
 825                 } else if (ch->voltags) {
 826                         ch->voltags = 0;
 827                         vprintk("device has no volume tag support\n");
 828                         goto voltag_retry;
 829                 }
 830                 kfree(buffer);
 831                 up(&ch->lock);
 832
 833                 if (copy_to_user((void*)arg, &cge, sizeof (cge)))
 834                         return -EFAULT;
 835                 return result;
 836         }
 837
 838         case CHIOINITELEM:
 839         {
 840                 down(&ch->lock);
 841                 retval = ch_init_elem(ch);
 842                 up(&ch->lock);
 843                 return retval;
 844         }
 845
 846         case CHIOSVOLTAG:
 847         {
 848                 struct changer_set_voltag csv;
 849                 int elem;
 850
 851                 if (copy_from_user(&csv, (void*)arg, sizeof(csv)))
 852                         return -EFAULT;
 853
 854                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 855                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 856                         return -EBADSLT;
 857                 }
 858                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 859                 down(&ch->lock);
 860                 retval = ch_set_voltag(ch, elem,
 861                                        csv.csv_flags & CSV_AVOLTAG,
 862                                        csv.csv_flags & CSV_CLEARTAG,
 863                                        csv.csv_voltag);
 864                 up(&ch->lock);
 865                 return retval;
 866         }
 867
 868         default:
 869                 return scsi_ioctl(ch->device, cmd, (void*)arg);
 870
 871         }
 872 }
 873
 874 #ifdef CONFIG_COMPAT
 875
 876 struct changer_element_status32 {
 877         int             ces_type;
 878         compat_uptr_t   ces_data;
 879 };
 880 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 881
 882 static long ch_ioctl_compat(struct file * file,
 883                             unsigned int cmd, unsigned long arg)
 884 {
 885         scsi_changer *ch = file->private_data;
 886
 887         switch (cmd) {
 888         case CHIOGPARAMS:
 889         case CHIOGVPARAMS:
 890         case CHIOPOSITION:
 891         case CHIOMOVE:
 892         case CHIOEXCHANGE:
 893         case CHIOGELEM:
 894         case CHIOINITELEM:
 895         case CHIOSVOLTAG:
 896                 /* compatible */
 897                 return ch_ioctl(NULL /* inode, unused */,
 898                                 file, cmd, arg);
 899         case CHIOGSTATUS32:
 900         {
 901                 struct changer_element_status32 ces32;
 902                 unsigned char *data;
 903
 904                 if (copy_from_user(&ces32, (void*)arg, sizeof (ces32)))
 905                         return -EFAULT;
 906                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 907                         return -EINVAL;
 908
 909                 data = compat_ptr(ces32.ces_data);
 910                 return ch_gstatus(ch, ces32.ces_type, data);
 911         }
 912         default:
 913                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 914                 return -ENOIOCTLCMD;
 915
 916         }
 917 }
 918 #endif
 919
 920 /* ------------------------------------------------------------------------ */
 921
 922 static int ch_probe(struct device *dev)
 923 {
 924         struct scsi_device *sd = to_scsi_device(dev);
 925         scsi_changer *ch;
 926
 927         if (sd->type != TYPE_MEDIUM_CHANGER)
 928                 return -ENODEV;
 929
 930         ch = kmalloc(sizeof(*ch), GFP_KERNEL);
 931         if (NULL == ch)
 932                 return -ENOMEM;
 933
 934         memset(ch,0,sizeof(*ch));
 935         ch->minor = ch_devcount;
 936         sprintf(ch->name,"ch%d",ch->minor);
 937         init_MUTEX(&ch->lock);
 938         ch->device = sd;
 939         ch_readconfig(ch);
 940         if (init)
 941                 ch_init_elem(ch);
 942
 943         devfs_mk_cdev(MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
 944                       S_IFCHR | S_IRUGO | S_IWUGO, ch->name);
 945         class_device_create(ch_sysfs_class,
 946                             MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
 947                             dev, "s%s", ch->name);
 948
 949         printk(KERN_INFO "Attached scsi changer %s "
 950                "at scsi%d, channel %d, id %d, lun %d\n",
 951                ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun);
 952
 953         spin_lock(&ch_devlist_lock);
 954         list_add_tail(&ch->list,&ch_devlist);
 955         ch_devcount++;
 956         spin_unlock(&ch_devlist_lock);
 957         return 0;
 958 }
 959
 960 static int ch_remove(struct device *dev)
 961 {
 962         struct scsi_device *sd = to_scsi_device(dev);
 963         scsi_changer *tmp, *ch;
 964
 965         spin_lock(&ch_devlist_lock);
 966         ch = NULL;
 967         list_for_each_entry(tmp,&ch_devlist,list) {
 968                 if (tmp->device == sd)
 969                         ch = tmp;
 970         }
 971         BUG_ON(NULL == ch);
 972         list_del(&ch->list);
 973         spin_unlock(&ch_devlist_lock);
 974
 975         class_device_destroy(ch_sysfs_class,
 976                              MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 977         devfs_remove(ch->name);
 978         kfree(ch->dt);
 979         kfree(ch);
 980         ch_devcount--;
 981         return 0;
 982 }
 983
 984 static int __init init_ch_module(void)
 985 {
 986         int rc;
 987
 988         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 989         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 990         if (IS_ERR(ch_sysfs_class)) {
 991                 rc = PTR_ERR(ch_sysfs_class);
 992                 return rc;
 993         }
 994         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 995         if (rc < 0) {
 996                 printk("Unable to get major %d for SCSI-Changer\n",
 997                        SCSI_CHANGER_MAJOR);
 998                 goto fail1;
 999         }
1000         rc = scsi_register_driver(&ch_template.gendrv);
1001         if (rc < 0)
1002                 goto fail2;
1003         return 0;
1004
1005  fail2:
1006         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1007  fail1:
1008         class_destroy(ch_sysfs_class);
1009         return rc;
1010 }
1011
1012 static void __exit exit_ch_module(void)
1013 {
1014         scsi_unregister_driver(&ch_template.gendrv);
1015         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1016         class_destroy(ch_sysfs_class);
1017 }
1018
1019 module_init(init_ch_module);
1020 module_exit(exit_ch_module);
1021
1022 /*
1023  * Local variables:
1024  * c-basic-offset: 8
1025  * End:
1026  */