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/slab.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 DEFINE_MUTEX(ch_mutex);
  47 static int init = 1;
  48 module_param(init, int, 0444);
  49 MODULE_PARM_DESC(init, \
  50     "initialize element status on driver load (default: on)");
  51
  52 static int timeout_move = 300;
  53 module_param(timeout_move, int, 0644);
  54 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
  55                  "(default: 300 seconds)");
  56
  57 static int timeout_init = 3600;
  58 module_param(timeout_init, int, 0644);
  59 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
  60                  "(default: 3600 seconds)");
  61
  62 static int verbose = 1;
  63 module_param(verbose, int, 0644);
  64 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
  65
  66 static int debug = 0;
  67 module_param(debug, int, 0644);
  68 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
  69                  "detailed sense codes on scsi errors (default: off)");
  70
  71 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
  72 static int dt_lun[CH_DT_MAX];
  73 module_param_array(dt_id,  int, NULL, 0444);
  74 module_param_array(dt_lun, int, NULL, 0444);
  75
  76 /* tell the driver about vendor-specific slots */
  77 static int vendor_firsts[CH_TYPES-4];
  78 static int vendor_counts[CH_TYPES-4];
  79 module_param_array(vendor_firsts, int, NULL, 0444);
  80 module_param_array(vendor_counts, int, NULL, 0444);
  81
  82 static const char * vendor_labels[CH_TYPES-4] = {
  83         "v0", "v1", "v2", "v3"
  84 };
  85 // module_param_string_array(vendor_labels, NULL, 0444);
  86
  87 #define DPRINTK(fmt, arg...)                                            \
  88 do {                                                                    \
  89         if (debug)                                                      \
  90                 printk(KERN_DEBUG "%s: " fmt, ch->name, ##arg);         \
  91 } while (0)
  92 #define VPRINTK(level, fmt, arg...)                                     \
  93 do {                                                                    \
  94         if (verbose)                                                    \
  95                 printk(level "%s: " fmt, ch->name, ##arg);              \
  96 } while (0)
  97
  98 /* ------------------------------------------------------------------- */
  99
 100 #define MAX_RETRIES   1
 101
 102 static struct class * ch_sysfs_class;
 103
 104 typedef struct {
 105         struct list_head    list;
 106         int                 minor;
 107         char                name[8];
 108         struct scsi_device  *device;
 109         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 110         u_int               firsts[CH_TYPES];
 111         u_int               counts[CH_TYPES];
 112         u_int               unit_attention;
 113         u_int               voltags;
 114         struct mutex        lock;
 115 } scsi_changer;
 116
 117 static DEFINE_IDR(ch_index_idr);
 118 static DEFINE_SPINLOCK(ch_index_lock);
 119
 120 static const struct {
 121         unsigned char  sense;
 122         unsigned char  asc;
 123         unsigned char  ascq;
 124         int            errno;
 125 } ch_err[] = {
 126 /* Just filled in what looks right. Hav'nt checked any standard paper for
 127    these errno assignments, so they may be wrong... */
 128         {
 129                 .sense  = ILLEGAL_REQUEST,
 130                 .asc    = 0x21,
 131                 .ascq   = 0x01,
 132                 .errno  = EBADSLT, /* Invalid element address */
 133         },{
 134                 .sense  = ILLEGAL_REQUEST,
 135                 .asc    = 0x28,
 136                 .ascq   = 0x01,
 137                 .errno  = EBADE,   /* Import or export element accessed */
 138         },{
 139                 .sense  = ILLEGAL_REQUEST,
 140                 .asc    = 0x3B,
 141                 .ascq   = 0x0D,
 142                 .errno  = EXFULL,  /* Medium destination element full */
 143         },{
 144                 .sense  = ILLEGAL_REQUEST,
 145                 .asc    = 0x3B,
 146                 .ascq   = 0x0E,
 147                 .errno  = EBADE,   /* Medium source element empty */
 148         },{
 149                 .sense  = ILLEGAL_REQUEST,
 150                 .asc    = 0x20,
 151                 .ascq   = 0x00,
 152                 .errno  = EBADRQC, /* Invalid command operation code */
 153         },{
 154                 /* end of list */
 155         }
 156 };
 157
 158 /* ------------------------------------------------------------------- */
 159
 160 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 161 {
 162         int i,errno = 0;
 163
 164         /* Check to see if additional sense information is available */
 165         if (scsi_sense_valid(sshdr) &&
 166             sshdr->asc != 0) {
 167                 for (i = 0; ch_err[i].errno != 0; i++) {
 168                         if (ch_err[i].sense == sshdr->sense_key &&
 169                             ch_err[i].asc   == sshdr->asc &&
 170                             ch_err[i].ascq  == sshdr->ascq) {
 171                                 errno = -ch_err[i].errno;
 172                                 break;
 173                         }
 174                 }
 175         }
 176         if (errno == 0)
 177                 errno = -EIO;
 178         return errno;
 179 }
 180
 181 static int
 182 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 183            void *buffer, unsigned buflength,
 184            enum dma_data_direction direction)
 185 {
 186         int errno, retries = 0, timeout, result;
 187         struct scsi_sense_hdr sshdr;
 188
 189         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 190                 ? timeout_init : timeout_move;
 191
 192  retry:
 193         errno = 0;
 194         if (debug) {
 195                 DPRINTK("command: ");
 196                 __scsi_print_command(cmd);
 197         }
 198
 199         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 200                                   buflength, &sshdr, timeout * HZ,
 201                                   MAX_RETRIES, NULL);
 202
 203         DPRINTK("result: 0x%x\n",result);
 204         if (driver_byte(result) & DRIVER_SENSE) {
 205                 if (debug)
 206                         scsi_print_sense_hdr(ch->name, &sshdr);
 207                 errno = ch_find_errno(&sshdr);
 208
 209                 switch(sshdr.sense_key) {
 210                 case UNIT_ATTENTION:
 211                         ch->unit_attention = 1;
 212                         if (retries++ < 3)
 213                                 goto retry;
 214                         break;
 215                 }
 216         }
 217         return errno;
 218 }
 219
 220 /* ------------------------------------------------------------------------ */
 221
 222 static int
 223 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 224 {
 225         int i;
 226
 227         for (i = 0; i < CH_TYPES; i++) {
 228                 if (elem >= ch->firsts[i]  &&
 229                     elem <  ch->firsts[i] +
 230                     ch->counts[i])
 231                         return i+1;
 232         }
 233         return 0;
 234 }
 235
 236 static int
 237 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 238 {
 239         u_char  cmd[12];
 240         u_char  *buffer;
 241         int     result;
 242
 243         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 244         if(!buffer)
 245                 return -ENOMEM;
 246
 247  retry:
 248         memset(cmd,0,sizeof(cmd));
 249         cmd[0] = READ_ELEMENT_STATUS;
 250         cmd[1] = (ch->device->lun << 5) |
 251                 (ch->voltags ? 0x10 : 0) |
 252                 ch_elem_to_typecode(ch,elem);
 253         cmd[2] = (elem >> 8) & 0xff;
 254         cmd[3] = elem        & 0xff;
 255         cmd[5] = 1;
 256         cmd[9] = 255;
 257         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 258                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 259                         DPRINTK("asked for element 0x%02x, got 0x%02x\n",
 260                                 elem,(buffer[16] << 8) | buffer[17]);
 261                         kfree(buffer);
 262                         return -EIO;
 263                 }
 264                 memcpy(data,buffer+16,16);
 265         } else {
 266                 if (ch->voltags) {
 267                         ch->voltags = 0;
 268                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
 269                         goto retry;
 270                 }
 271                 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 272         }
 273         kfree(buffer);
 274         return result;
 275 }
 276
 277 static int
 278 ch_init_elem(scsi_changer *ch)
 279 {
 280         int err;
 281         u_char cmd[6];
 282
 283         VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
 284         memset(cmd,0,sizeof(cmd));
 285         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 286         cmd[1] = ch->device->lun << 5;
 287         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 288         VPRINTK(KERN_INFO, "... finished\n");
 289         return err;
 290 }
 291
 292 static int
 293 ch_readconfig(scsi_changer *ch)
 294 {
 295         u_char  cmd[10], data[16];
 296         u_char  *buffer;
 297         int     result,id,lun,i;
 298         u_int   elem;
 299
 300         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 301         if (!buffer)
 302                 return -ENOMEM;
 303
 304         memset(cmd,0,sizeof(cmd));
 305         cmd[0] = MODE_SENSE;
 306         cmd[1] = ch->device->lun << 5;
 307         cmd[2] = 0x1d;
 308         cmd[4] = 255;
 309         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 310         if (0 != result) {
 311                 cmd[1] |= (1<<3);
 312                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 313         }
 314         if (0 == result) {
 315                 ch->firsts[CHET_MT] =
 316                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 317                 ch->counts[CHET_MT] =
 318                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 319                 ch->firsts[CHET_ST] =
 320                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 321                 ch->counts[CHET_ST] =
 322                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 323                 ch->firsts[CHET_IE] =
 324                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 325                 ch->counts[CHET_IE] =
 326                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 327                 ch->firsts[CHET_DT] =
 328                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 329                 ch->counts[CHET_DT] =
 330                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 331                 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
 332                         ch->firsts[CHET_MT],
 333                         ch->counts[CHET_MT]);
 334                 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
 335                         ch->firsts[CHET_ST],
 336                         ch->counts[CHET_ST]);
 337                 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
 338                         ch->firsts[CHET_IE],
 339                         ch->counts[CHET_IE]);
 340                 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
 341                         ch->firsts[CHET_DT],
 342                         ch->counts[CHET_DT]);
 343         } else {
 344                 VPRINTK(KERN_INFO, "reading element address assigment page failed!\n");
 345         }
 346
 347         /* vendor specific element types */
 348         for (i = 0; i < 4; i++) {
 349                 if (0 == vendor_counts[i])
 350                         continue;
 351                 if (NULL == vendor_labels[i])
 352                         continue;
 353                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 354                 ch->counts[CHET_V1+i] = vendor_counts[i];
 355                 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 356                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 357                         vendor_labels[i]);
 358         }
 359
 360         /* look up the devices of the data transfer elements */
 361         ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
 362                          GFP_KERNEL);
 363
 364         if (!ch->dt) {
 365                 kfree(buffer);
 366                 return -ENOMEM;
 367         }
 368
 369         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 370                 id  = -1;
 371                 lun = 0;
 372                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 373                         id  = dt_id[elem];
 374                         lun = dt_lun[elem];
 375                         VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
 376                                 elem+ch->firsts[CHET_DT]);
 377                 } else if (0 != ch_read_element_status
 378                            (ch,elem+ch->firsts[CHET_DT],data)) {
 379                         VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
 380                                 elem+ch->firsts[CHET_DT]);
 381                 } else {
 382                         VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 383                         if (data[6] & 0x80) {
 384                                 VPRINTK(KERN_CONT, "not this SCSI bus\n");
 385                                 ch->dt[elem] = NULL;
 386                         } else if (0 == (data[6] & 0x30)) {
 387                                 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
 388                                 ch->dt[elem] = NULL;
 389                         } else {
 390                                 id  = ch->device->id;
 391                                 lun = 0;
 392                                 if (data[6] & 0x20) id  = data[7];
 393                                 if (data[6] & 0x10) lun = data[6] & 7;
 394                         }
 395                 }
 396                 if (-1 != id) {
 397                         VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
 398                         ch->dt[elem] =
 399                                 scsi_device_lookup(ch->device->host,
 400                                                    ch->device->channel,
 401                                                    id,lun);
 402                         if (!ch->dt[elem]) {
 403                                 /* should not happen */
 404                                 VPRINTK(KERN_CONT, "Huh? device not found!\n");
 405                         } else {
 406                                 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
 407                                         ch->dt[elem]->vendor,
 408                                         ch->dt[elem]->model,
 409                                         ch->dt[elem]->rev);
 410                         }
 411                 }
 412         }
 413         ch->voltags = 1;
 414         kfree(buffer);
 415
 416         return 0;
 417 }
 418
 419 /* ------------------------------------------------------------------------ */
 420
 421 static int
 422 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 423 {
 424         u_char  cmd[10];
 425
 426         DPRINTK("position: 0x%x\n",elem);
 427         if (0 == trans)
 428                 trans = ch->firsts[CHET_MT];
 429         memset(cmd,0,sizeof(cmd));
 430         cmd[0]  = POSITION_TO_ELEMENT;
 431         cmd[1]  = ch->device->lun << 5;
 432         cmd[2]  = (trans >> 8) & 0xff;
 433         cmd[3]  =  trans       & 0xff;
 434         cmd[4]  = (elem  >> 8) & 0xff;
 435         cmd[5]  =  elem        & 0xff;
 436         cmd[8]  = rotate ? 1 : 0;
 437         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 438 }
 439
 440 static int
 441 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 442 {
 443         u_char  cmd[12];
 444
 445         DPRINTK("move: 0x%x => 0x%x\n",src,dest);
 446         if (0 == trans)
 447                 trans = ch->firsts[CHET_MT];
 448         memset(cmd,0,sizeof(cmd));
 449         cmd[0]  = MOVE_MEDIUM;
 450         cmd[1]  = ch->device->lun << 5;
 451         cmd[2]  = (trans >> 8) & 0xff;
 452         cmd[3]  =  trans       & 0xff;
 453         cmd[4]  = (src   >> 8) & 0xff;
 454         cmd[5]  =  src         & 0xff;
 455         cmd[6]  = (dest  >> 8) & 0xff;
 456         cmd[7]  =  dest        & 0xff;
 457         cmd[10] = rotate ? 1 : 0;
 458         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 459 }
 460
 461 static int
 462 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 463             u_int dest1, u_int dest2, int rotate1, int rotate2)
 464 {
 465         u_char  cmd[12];
 466
 467         DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
 468                 src,dest1,dest2);
 469         if (0 == trans)
 470                 trans = ch->firsts[CHET_MT];
 471         memset(cmd,0,sizeof(cmd));
 472         cmd[0]  = EXCHANGE_MEDIUM;
 473         cmd[1]  = ch->device->lun << 5;
 474         cmd[2]  = (trans >> 8) & 0xff;
 475         cmd[3]  =  trans       & 0xff;
 476         cmd[4]  = (src   >> 8) & 0xff;
 477         cmd[5]  =  src         & 0xff;
 478         cmd[6]  = (dest1 >> 8) & 0xff;
 479         cmd[7]  =  dest1       & 0xff;
 480         cmd[8]  = (dest2 >> 8) & 0xff;
 481         cmd[9]  =  dest2       & 0xff;
 482         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 483
 484         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 485 }
 486
 487 static void
 488 ch_check_voltag(char *tag)
 489 {
 490         int i;
 491
 492         for (i = 0; i < 32; i++) {
 493                 /* restrict to ascii */
 494                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 495                         tag[i] = ' ';
 496                 /* don't allow search wildcards */
 497                 if (tag[i] == '?' ||
 498                     tag[i] == '*')
 499                         tag[i] = ' ';
 500         }
 501 }
 502
 503 static int
 504 ch_set_voltag(scsi_changer *ch, u_int elem,
 505               int alternate, int clear, u_char *tag)
 506 {
 507         u_char  cmd[12];
 508         u_char  *buffer;
 509         int result;
 510
 511         buffer = kzalloc(512, GFP_KERNEL);
 512         if (!buffer)
 513                 return -ENOMEM;
 514
 515         DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
 516                 clear     ? "clear"     : "set",
 517                 alternate ? "alternate" : "primary",
 518                 elem, tag);
 519         memset(cmd,0,sizeof(cmd));
 520         cmd[0]  = SEND_VOLUME_TAG;
 521         cmd[1] = (ch->device->lun << 5) |
 522                 ch_elem_to_typecode(ch,elem);
 523         cmd[2] = (elem >> 8) & 0xff;
 524         cmd[3] = elem        & 0xff;
 525         cmd[5] = clear
 526                 ? (alternate ? 0x0d : 0x0c)
 527                 : (alternate ? 0x0b : 0x0a);
 528
 529         cmd[9] = 255;
 530
 531         memcpy(buffer,tag,32);
 532         ch_check_voltag(buffer);
 533
 534         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 535         kfree(buffer);
 536         return result;
 537 }
 538
 539 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 540 {
 541         int retval = 0;
 542         u_char data[16];
 543         unsigned int i;
 544
 545         mutex_lock(&ch->lock);
 546         for (i = 0; i < ch->counts[type]; i++) {
 547                 if (0 != ch_read_element_status
 548                     (ch, ch->firsts[type]+i,data)) {
 549                         retval = -EIO;
 550                         break;
 551                 }
 552                 put_user(data[2], dest+i);
 553                 if (data[2] & CESTATUS_EXCEPT)
 554                         VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
 555                                 ch->firsts[type]+i,
 556                                 (int)data[4],(int)data[5]);
 557                 retval = ch_read_element_status
 558                         (ch, ch->firsts[type]+i,data);
 559                 if (0 != retval)
 560                         break;
 561         }
 562         mutex_unlock(&ch->lock);
 563         return retval;
 564 }
 565
 566 /* ------------------------------------------------------------------------ */
 567
 568 static int
 569 ch_release(struct inode *inode, struct file *file)
 570 {
 571         scsi_changer *ch = file->private_data;
 572
 573         scsi_device_put(ch->device);
 574         file->private_data = NULL;
 575         return 0;
 576 }
 577
 578 static int
 579 ch_open(struct inode *inode, struct file *file)
 580 {
 581         scsi_changer *ch;
 582         int minor = iminor(inode);
 583
 584         mutex_lock(&ch_mutex);
 585         spin_lock(&ch_index_lock);
 586         ch = idr_find(&ch_index_idr, minor);
 587
 588         if (NULL == ch || scsi_device_get(ch->device)) {
 589                 spin_unlock(&ch_index_lock);
 590                 mutex_unlock(&ch_mutex);
 591                 return -ENXIO;
 592         }
 593         spin_unlock(&ch_index_lock);
 594
 595         file->private_data = ch;
 596         mutex_unlock(&ch_mutex);
 597         return 0;
 598 }
 599
 600 static int
 601 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 602 {
 603         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 604                 return -1;
 605         return 0;
 606 }
 607
 608 static long ch_ioctl(struct file *file,
 609                     unsigned int cmd, unsigned long arg)
 610 {
 611         scsi_changer *ch = file->private_data;
 612         int retval;
 613         void __user *argp = (void __user *)arg;
 614
 615         switch (cmd) {
 616         case CHIOGPARAMS:
 617         {
 618                 struct changer_params params;
 619
 620                 params.cp_curpicker = 0;
 621                 params.cp_npickers  = ch->counts[CHET_MT];
 622                 params.cp_nslots    = ch->counts[CHET_ST];
 623                 params.cp_nportals  = ch->counts[CHET_IE];
 624                 params.cp_ndrives   = ch->counts[CHET_DT];
 625
 626                 if (copy_to_user(argp, &params, sizeof(params)))
 627                         return -EFAULT;
 628                 return 0;
 629         }
 630         case CHIOGVPARAMS:
 631         {
 632                 struct changer_vendor_params vparams;
 633
 634                 memset(&vparams,0,sizeof(vparams));
 635                 if (ch->counts[CHET_V1]) {
 636                         vparams.cvp_n1  = ch->counts[CHET_V1];
 637                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 638                 }
 639                 if (ch->counts[CHET_V2]) {
 640                         vparams.cvp_n2  = ch->counts[CHET_V2];
 641                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 642                 }
 643                 if (ch->counts[CHET_V3]) {
 644                         vparams.cvp_n3  = ch->counts[CHET_V3];
 645                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 646                 }
 647                 if (ch->counts[CHET_V4]) {
 648                         vparams.cvp_n4  = ch->counts[CHET_V4];
 649                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 650                 }
 651                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 652                         return -EFAULT;
 653                 return 0;
 654         }
 655
 656         case CHIOPOSITION:
 657         {
 658                 struct changer_position pos;
 659
 660                 if (copy_from_user(&pos, argp, sizeof (pos)))
 661                         return -EFAULT;
 662
 663                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 664                         DPRINTK("CHIOPOSITION: invalid parameter\n");
 665                         return -EBADSLT;
 666                 }
 667                 mutex_lock(&ch->lock);
 668                 retval = ch_position(ch,0,
 669                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 670                                      pos.cp_flags & CP_INVERT);
 671                 mutex_unlock(&ch->lock);
 672                 return retval;
 673         }
 674
 675         case CHIOMOVE:
 676         {
 677                 struct changer_move mv;
 678
 679                 if (copy_from_user(&mv, argp, sizeof (mv)))
 680                         return -EFAULT;
 681
 682                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 683                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 684                         DPRINTK("CHIOMOVE: invalid parameter\n");
 685                         return -EBADSLT;
 686                 }
 687
 688                 mutex_lock(&ch->lock);
 689                 retval = ch_move(ch,0,
 690                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 691                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 692                                  mv.cm_flags & CM_INVERT);
 693                 mutex_unlock(&ch->lock);
 694                 return retval;
 695         }
 696
 697         case CHIOEXCHANGE:
 698         {
 699                 struct changer_exchange mv;
 700
 701                 if (copy_from_user(&mv, argp, sizeof (mv)))
 702                         return -EFAULT;
 703
 704                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 705                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 706                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 707                         DPRINTK("CHIOEXCHANGE: invalid parameter\n");
 708                         return -EBADSLT;
 709                 }
 710
 711                 mutex_lock(&ch->lock);
 712                 retval = ch_exchange
 713                         (ch,0,
 714                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 715                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 716                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 717                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 718                 mutex_unlock(&ch->lock);
 719                 return retval;
 720         }
 721
 722         case CHIOGSTATUS:
 723         {
 724                 struct changer_element_status ces;
 725
 726                 if (copy_from_user(&ces, argp, sizeof (ces)))
 727                         return -EFAULT;
 728                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 729                         return -EINVAL;
 730
 731                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 732         }
 733
 734         case CHIOGELEM:
 735         {
 736                 struct changer_get_element cge;
 737                 u_char ch_cmd[12];
 738                 u_char *buffer;
 739                 unsigned int elem;
 740                 int     result,i;
 741
 742                 if (copy_from_user(&cge, argp, sizeof (cge)))
 743                         return -EFAULT;
 744
 745                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 746                         return -EINVAL;
 747                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 748
 749                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 750                 if (!buffer)
 751                         return -ENOMEM;
 752                 mutex_lock(&ch->lock);
 753
 754         voltag_retry:
 755                 memset(ch_cmd, 0, sizeof(ch_cmd));
 756                 ch_cmd[0] = READ_ELEMENT_STATUS;
 757                 ch_cmd[1] = (ch->device->lun << 5) |
 758                         (ch->voltags ? 0x10 : 0) |
 759                         ch_elem_to_typecode(ch,elem);
 760                 ch_cmd[2] = (elem >> 8) & 0xff;
 761                 ch_cmd[3] = elem        & 0xff;
 762                 ch_cmd[5] = 1;
 763                 ch_cmd[9] = 255;
 764
 765                 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
 766                 if (!result) {
 767                         cge.cge_status = buffer[18];
 768                         cge.cge_flags = 0;
 769                         if (buffer[18] & CESTATUS_EXCEPT) {
 770                                 cge.cge_errno = EIO;
 771                         }
 772                         if (buffer[25] & 0x80) {
 773                                 cge.cge_flags |= CGE_SRC;
 774                                 if (buffer[25] & 0x40)
 775                                         cge.cge_flags |= CGE_INVERT;
 776                                 elem = (buffer[26]<<8) | buffer[27];
 777                                 for (i = 0; i < 4; i++) {
 778                                         if (elem >= ch->firsts[i] &&
 779                                             elem <  ch->firsts[i] + ch->counts[i]) {
 780                                                 cge.cge_srctype = i;
 781                                                 cge.cge_srcunit = elem-ch->firsts[i];
 782                                         }
 783                                 }
 784                         }
 785                         if ((buffer[22] & 0x30) == 0x30) {
 786                                 cge.cge_flags |= CGE_IDLUN;
 787                                 cge.cge_id  = buffer[23];
 788                                 cge.cge_lun = buffer[22] & 7;
 789                         }
 790                         if (buffer[9] & 0x80) {
 791                                 cge.cge_flags |= CGE_PVOLTAG;
 792                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 793                         }
 794                         if (buffer[9] & 0x40) {
 795                                 cge.cge_flags |= CGE_AVOLTAG;
 796                                 memcpy(cge.cge_avoltag,buffer+64,36);
 797                         }
 798                 } else if (ch->voltags) {
 799                         ch->voltags = 0;
 800                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
 801                         goto voltag_retry;
 802                 }
 803                 kfree(buffer);
 804                 mutex_unlock(&ch->lock);
 805
 806                 if (copy_to_user(argp, &cge, sizeof (cge)))
 807                         return -EFAULT;
 808                 return result;
 809         }
 810
 811         case CHIOINITELEM:
 812         {
 813                 mutex_lock(&ch->lock);
 814                 retval = ch_init_elem(ch);
 815                 mutex_unlock(&ch->lock);
 816                 return retval;
 817         }
 818
 819         case CHIOSVOLTAG:
 820         {
 821                 struct changer_set_voltag csv;
 822                 int elem;
 823
 824                 if (copy_from_user(&csv, argp, sizeof(csv)))
 825                         return -EFAULT;
 826
 827                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 828                         DPRINTK("CHIOSVOLTAG: invalid parameter\n");
 829                         return -EBADSLT;
 830                 }
 831                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 832                 mutex_lock(&ch->lock);
 833                 retval = ch_set_voltag(ch, elem,
 834                                        csv.csv_flags & CSV_AVOLTAG,
 835                                        csv.csv_flags & CSV_CLEARTAG,
 836                                        csv.csv_voltag);
 837                 mutex_unlock(&ch->lock);
 838                 return retval;
 839         }
 840
 841         default:
 842                 return scsi_ioctl(ch->device, cmd, argp);
 843
 844         }
 845 }
 846
 847 #ifdef CONFIG_COMPAT
 848
 849 struct changer_element_status32 {
 850         int             ces_type;
 851         compat_uptr_t   ces_data;
 852 };
 853 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 854
 855 static long ch_ioctl_compat(struct file * file,
 856                             unsigned int cmd, unsigned long arg)
 857 {
 858         scsi_changer *ch = file->private_data;
 859
 860         switch (cmd) {
 861         case CHIOGPARAMS:
 862         case CHIOGVPARAMS:
 863         case CHIOPOSITION:
 864         case CHIOMOVE:
 865         case CHIOEXCHANGE:
 866         case CHIOGELEM:
 867         case CHIOINITELEM:
 868         case CHIOSVOLTAG:
 869                 /* compatible */
 870                 return ch_ioctl(file, cmd, arg);
 871         case CHIOGSTATUS32:
 872         {
 873                 struct changer_element_status32 ces32;
 874                 unsigned char __user *data;
 875
 876                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 877                         return -EFAULT;
 878                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 879                         return -EINVAL;
 880
 881                 data = compat_ptr(ces32.ces_data);
 882                 return ch_gstatus(ch, ces32.ces_type, data);
 883         }
 884         default:
 885                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 886                 return -ENOIOCTLCMD;
 887
 888         }
 889 }
 890 #endif
 891
 892 /* ------------------------------------------------------------------------ */
 893
 894 static int ch_probe(struct device *dev)
 895 {
 896         struct scsi_device *sd = to_scsi_device(dev);
 897         struct device *class_dev;
 898         int minor, ret = -ENOMEM;
 899         scsi_changer *ch;
 900
 901         if (sd->type != TYPE_MEDIUM_CHANGER)
 902                 return -ENODEV;
 903
 904         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 905         if (NULL == ch)
 906                 return -ENOMEM;
 907
 908         if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
 909                 goto free_ch;
 910
 911         spin_lock(&ch_index_lock);
 912         ret = idr_get_new(&ch_index_idr, ch, &minor);
 913         spin_unlock(&ch_index_lock);
 914
 915         if (ret)
 916                 goto free_ch;
 917
 918         if (minor > CH_MAX_DEVS) {
 919                 ret = -ENODEV;
 920                 goto remove_idr;
 921         }
 922
 923         ch->minor = minor;
 924         sprintf(ch->name,"ch%d",ch->minor);
 925
 926         class_dev = device_create(ch_sysfs_class, dev,
 927                                   MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
 928                                   "s%s", ch->name);
 929         if (IS_ERR(class_dev)) {
 930                 printk(KERN_WARNING "ch%d: device_create failed\n",
 931                        ch->minor);
 932                 ret = PTR_ERR(class_dev);
 933                 goto remove_idr;
 934         }
 935
 936         mutex_init(&ch->lock);
 937         ch->device = sd;
 938         ch_readconfig(ch);
 939         if (init)
 940                 ch_init_elem(ch);
 941
 942         dev_set_drvdata(dev, ch);
 943         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 944
 945         return 0;
 946 remove_idr:
 947         idr_remove(&ch_index_idr, minor);
 948 free_ch:
 949         kfree(ch);
 950         return ret;
 951 }
 952
 953 static int ch_remove(struct device *dev)
 954 {
 955         scsi_changer *ch = dev_get_drvdata(dev);
 956
 957         spin_lock(&ch_index_lock);
 958         idr_remove(&ch_index_idr, ch->minor);
 959         spin_unlock(&ch_index_lock);
 960
 961         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 962         kfree(ch->dt);
 963         kfree(ch);
 964         return 0;
 965 }
 966
 967 static struct scsi_driver ch_template = {
 968         .owner          = THIS_MODULE,
 969         .gendrv         = {
 970                 .name   = "ch",
 971                 .probe  = ch_probe,
 972                 .remove = ch_remove,
 973         },
 974 };
 975
 976 static const struct file_operations changer_fops = {
 977         .owner          = THIS_MODULE,
 978         .open           = ch_open,
 979         .release        = ch_release,
 980         .unlocked_ioctl = ch_ioctl,
 981 #ifdef CONFIG_COMPAT
 982         .compat_ioctl   = ch_ioctl_compat,
 983 #endif
 984         .llseek         = noop_llseek,
 985 };
 986
 987 static int __init init_ch_module(void)
 988 {
 989         int rc;
 990
 991         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 992         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 993         if (IS_ERR(ch_sysfs_class)) {
 994                 rc = PTR_ERR(ch_sysfs_class);
 995                 return rc;
 996         }
 997         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 998         if (rc < 0) {
 999                 printk("Unable to get major %d for SCSI-Changer\n",
1000                        SCSI_CHANGER_MAJOR);
1001                 goto fail1;
1002         }
1003         rc = scsi_register_driver(&ch_template.gendrv);
1004         if (rc < 0)
1005                 goto fail2;
1006         return 0;
1007
1008  fail2:
1009         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1010  fail1:
1011         class_destroy(ch_sysfs_class);
1012         return rc;
1013 }
1014
1015 static void __exit exit_ch_module(void)
1016 {
1017         scsi_unregister_driver(&ch_template.gendrv);
1018         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1019         class_destroy(ch_sysfs_class);
1020         idr_destroy(&ch_index_idr);
1021 }
1022
1023 module_init(init_ch_module);
1024 module_exit(exit_ch_module);
1025
1026 /*
1027  * Local variables:
1028  * c-basic-offset: 8
1029  * End:
1030  */