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 ch_printk(prefix, ch, fmt, a...) \
  88         sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
  89
  90 #define DPRINTK(fmt, arg...)                                            \
  91 do {                                                                    \
  92         if (debug)                                                      \
  93                 ch_printk(KERN_DEBUG, ch, fmt, ##arg);                  \
  94 } while (0)
  95 #define VPRINTK(level, fmt, arg...)                                     \
  96 do {                                                                    \
  97         if (verbose)                                                    \
  98                 ch_printk(level, ch, fmt, ##arg);                       \
  99 } while (0)
 100
 101 /* ------------------------------------------------------------------- */
 102
 103 #define MAX_RETRIES   1
 104
 105 static struct class * ch_sysfs_class;
 106
 107 typedef struct {
 108         struct list_head    list;
 109         int                 minor;
 110         char                name[8];
 111         struct scsi_device  *device;
 112         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 113         u_int               firsts[CH_TYPES];
 114         u_int               counts[CH_TYPES];
 115         u_int               unit_attention;
 116         u_int               voltags;
 117         struct mutex        lock;
 118 } scsi_changer;
 119
 120 static DEFINE_IDR(ch_index_idr);
 121 static DEFINE_SPINLOCK(ch_index_lock);
 122
 123 static const struct {
 124         unsigned char  sense;
 125         unsigned char  asc;
 126         unsigned char  ascq;
 127         int            errno;
 128 } ch_err[] = {
 129 /* Just filled in what looks right. Hav'nt checked any standard paper for
 130    these errno assignments, so they may be wrong... */
 131         {
 132                 .sense  = ILLEGAL_REQUEST,
 133                 .asc    = 0x21,
 134                 .ascq   = 0x01,
 135                 .errno  = EBADSLT, /* Invalid element address */
 136         },{
 137                 .sense  = ILLEGAL_REQUEST,
 138                 .asc    = 0x28,
 139                 .ascq   = 0x01,
 140                 .errno  = EBADE,   /* Import or export element accessed */
 141         },{
 142                 .sense  = ILLEGAL_REQUEST,
 143                 .asc    = 0x3B,
 144                 .ascq   = 0x0D,
 145                 .errno  = EXFULL,  /* Medium destination element full */
 146         },{
 147                 .sense  = ILLEGAL_REQUEST,
 148                 .asc    = 0x3B,
 149                 .ascq   = 0x0E,
 150                 .errno  = EBADE,   /* Medium source element empty */
 151         },{
 152                 .sense  = ILLEGAL_REQUEST,
 153                 .asc    = 0x20,
 154                 .ascq   = 0x00,
 155                 .errno  = EBADRQC, /* Invalid command operation code */
 156         },{
 157                 /* end of list */
 158         }
 159 };
 160
 161 /* ------------------------------------------------------------------- */
 162
 163 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 164 {
 165         int i,errno = 0;
 166
 167         /* Check to see if additional sense information is available */
 168         if (scsi_sense_valid(sshdr) &&
 169             sshdr->asc != 0) {
 170                 for (i = 0; ch_err[i].errno != 0; i++) {
 171                         if (ch_err[i].sense == sshdr->sense_key &&
 172                             ch_err[i].asc   == sshdr->asc &&
 173                             ch_err[i].ascq  == sshdr->ascq) {
 174                                 errno = -ch_err[i].errno;
 175                                 break;
 176                         }
 177                 }
 178         }
 179         if (errno == 0)
 180                 errno = -EIO;
 181         return errno;
 182 }
 183
 184 static int
 185 ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
 186            void *buffer, unsigned buflength,
 187            enum dma_data_direction direction)
 188 {
 189         int errno, retries = 0, timeout, result;
 190         struct scsi_sense_hdr sshdr;
 191
 192         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 193                 ? timeout_init : timeout_move;
 194
 195  retry:
 196         errno = 0;
 197         if (debug) {
 198                 DPRINTK("command: ");
 199                 __scsi_print_command(cmd, cmd_len);
 200         }
 201
 202         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 203                                   buflength, &sshdr, timeout * HZ,
 204                                   MAX_RETRIES, NULL);
 205
 206         DPRINTK("result: 0x%x\n",result);
 207         if (driver_byte(result) & DRIVER_SENSE) {
 208                 if (debug)
 209                         scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
 210                 errno = ch_find_errno(&sshdr);
 211
 212                 switch(sshdr.sense_key) {
 213                 case UNIT_ATTENTION:
 214                         ch->unit_attention = 1;
 215                         if (retries++ < 3)
 216                                 goto retry;
 217                         break;
 218                 }
 219         }
 220         return errno;
 221 }
 222
 223 /* ------------------------------------------------------------------------ */
 224
 225 static int
 226 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 227 {
 228         int i;
 229
 230         for (i = 0; i < CH_TYPES; i++) {
 231                 if (elem >= ch->firsts[i]  &&
 232                     elem <  ch->firsts[i] +
 233                     ch->counts[i])
 234                         return i+1;
 235         }
 236         return 0;
 237 }
 238
 239 static int
 240 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 241 {
 242         u_char  cmd[12];
 243         u_char  *buffer;
 244         int     result;
 245
 246         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 247         if(!buffer)
 248                 return -ENOMEM;
 249
 250  retry:
 251         memset(cmd,0,sizeof(cmd));
 252         cmd[0] = READ_ELEMENT_STATUS;
 253         cmd[1] = ((ch->device->lun & 0x7) << 5) |
 254                 (ch->voltags ? 0x10 : 0) |
 255                 ch_elem_to_typecode(ch,elem);
 256         cmd[2] = (elem >> 8) & 0xff;
 257         cmd[3] = elem        & 0xff;
 258         cmd[5] = 1;
 259         cmd[9] = 255;
 260         if (0 == (result = ch_do_scsi(ch, cmd, 12,
 261                                       buffer, 256, DMA_FROM_DEVICE))) {
 262                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 263                         DPRINTK("asked for element 0x%02x, got 0x%02x\n",
 264                                 elem,(buffer[16] << 8) | buffer[17]);
 265                         kfree(buffer);
 266                         return -EIO;
 267                 }
 268                 memcpy(data,buffer+16,16);
 269         } else {
 270                 if (ch->voltags) {
 271                         ch->voltags = 0;
 272                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
 273                         goto retry;
 274                 }
 275                 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 276         }
 277         kfree(buffer);
 278         return result;
 279 }
 280
 281 static int
 282 ch_init_elem(scsi_changer *ch)
 283 {
 284         int err;
 285         u_char cmd[6];
 286
 287         VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
 288         memset(cmd,0,sizeof(cmd));
 289         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 290         cmd[1] = (ch->device->lun & 0x7) << 5;
 291         err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
 292         VPRINTK(KERN_INFO, "... finished\n");
 293         return err;
 294 }
 295
 296 static int
 297 ch_readconfig(scsi_changer *ch)
 298 {
 299         u_char  cmd[10], data[16];
 300         u_char  *buffer;
 301         int     result,id,lun,i;
 302         u_int   elem;
 303
 304         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 305         if (!buffer)
 306                 return -ENOMEM;
 307
 308         memset(cmd,0,sizeof(cmd));
 309         cmd[0] = MODE_SENSE;
 310         cmd[1] = (ch->device->lun & 0x7) << 5;
 311         cmd[2] = 0x1d;
 312         cmd[4] = 255;
 313         result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
 314         if (0 != result) {
 315                 cmd[1] |= (1<<3);
 316                 result  = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
 317         }
 318         if (0 == result) {
 319                 ch->firsts[CHET_MT] =
 320                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 321                 ch->counts[CHET_MT] =
 322                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 323                 ch->firsts[CHET_ST] =
 324                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 325                 ch->counts[CHET_ST] =
 326                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 327                 ch->firsts[CHET_IE] =
 328                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 329                 ch->counts[CHET_IE] =
 330                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 331                 ch->firsts[CHET_DT] =
 332                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 333                 ch->counts[CHET_DT] =
 334                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 335                 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
 336                         ch->firsts[CHET_MT],
 337                         ch->counts[CHET_MT]);
 338                 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
 339                         ch->firsts[CHET_ST],
 340                         ch->counts[CHET_ST]);
 341                 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
 342                         ch->firsts[CHET_IE],
 343                         ch->counts[CHET_IE]);
 344                 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
 345                         ch->firsts[CHET_DT],
 346                         ch->counts[CHET_DT]);
 347         } else {
 348                 VPRINTK(KERN_INFO, "reading element address assigment page failed!\n");
 349         }
 350
 351         /* vendor specific element types */
 352         for (i = 0; i < 4; i++) {
 353                 if (0 == vendor_counts[i])
 354                         continue;
 355                 if (NULL == vendor_labels[i])
 356                         continue;
 357                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 358                 ch->counts[CHET_V1+i] = vendor_counts[i];
 359                 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 360                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 361                         vendor_labels[i]);
 362         }
 363
 364         /* look up the devices of the data transfer elements */
 365         ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
 366                          GFP_KERNEL);
 367
 368         if (!ch->dt) {
 369                 kfree(buffer);
 370                 return -ENOMEM;
 371         }
 372
 373         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 374                 id  = -1;
 375                 lun = 0;
 376                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 377                         id  = dt_id[elem];
 378                         lun = dt_lun[elem];
 379                         VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
 380                                 elem+ch->firsts[CHET_DT]);
 381                 } else if (0 != ch_read_element_status
 382                            (ch,elem+ch->firsts[CHET_DT],data)) {
 383                         VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
 384                                 elem+ch->firsts[CHET_DT]);
 385                 } else {
 386                         VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 387                         if (data[6] & 0x80) {
 388                                 VPRINTK(KERN_CONT, "not this SCSI bus\n");
 389                                 ch->dt[elem] = NULL;
 390                         } else if (0 == (data[6] & 0x30)) {
 391                                 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
 392                                 ch->dt[elem] = NULL;
 393                         } else {
 394                                 id  = ch->device->id;
 395                                 lun = 0;
 396                                 if (data[6] & 0x20) id  = data[7];
 397                                 if (data[6] & 0x10) lun = data[6] & 7;
 398                         }
 399                 }
 400                 if (-1 != id) {
 401                         VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
 402                         ch->dt[elem] =
 403                                 scsi_device_lookup(ch->device->host,
 404                                                    ch->device->channel,
 405                                                    id,lun);
 406                         if (!ch->dt[elem]) {
 407                                 /* should not happen */
 408                                 VPRINTK(KERN_CONT, "Huh? device not found!\n");
 409                         } else {
 410                                 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
 411                                         ch->dt[elem]->vendor,
 412                                         ch->dt[elem]->model,
 413                                         ch->dt[elem]->rev);
 414                         }
 415                 }
 416         }
 417         ch->voltags = 1;
 418         kfree(buffer);
 419
 420         return 0;
 421 }
 422
 423 /* ------------------------------------------------------------------------ */
 424
 425 static int
 426 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 427 {
 428         u_char  cmd[10];
 429
 430         DPRINTK("position: 0x%x\n",elem);
 431         if (0 == trans)
 432                 trans = ch->firsts[CHET_MT];
 433         memset(cmd,0,sizeof(cmd));
 434         cmd[0]  = POSITION_TO_ELEMENT;
 435         cmd[1]  = (ch->device->lun & 0x7) << 5;
 436         cmd[2]  = (trans >> 8) & 0xff;
 437         cmd[3]  =  trans       & 0xff;
 438         cmd[4]  = (elem  >> 8) & 0xff;
 439         cmd[5]  =  elem        & 0xff;
 440         cmd[8]  = rotate ? 1 : 0;
 441         return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
 442 }
 443
 444 static int
 445 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 446 {
 447         u_char  cmd[12];
 448
 449         DPRINTK("move: 0x%x => 0x%x\n",src,dest);
 450         if (0 == trans)
 451                 trans = ch->firsts[CHET_MT];
 452         memset(cmd,0,sizeof(cmd));
 453         cmd[0]  = MOVE_MEDIUM;
 454         cmd[1]  = (ch->device->lun & 0x7) << 5;
 455         cmd[2]  = (trans >> 8) & 0xff;
 456         cmd[3]  =  trans       & 0xff;
 457         cmd[4]  = (src   >> 8) & 0xff;
 458         cmd[5]  =  src         & 0xff;
 459         cmd[6]  = (dest  >> 8) & 0xff;
 460         cmd[7]  =  dest        & 0xff;
 461         cmd[10] = rotate ? 1 : 0;
 462         return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
 463 }
 464
 465 static int
 466 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 467             u_int dest1, u_int dest2, int rotate1, int rotate2)
 468 {
 469         u_char  cmd[12];
 470
 471         DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
 472                 src,dest1,dest2);
 473         if (0 == trans)
 474                 trans = ch->firsts[CHET_MT];
 475         memset(cmd,0,sizeof(cmd));
 476         cmd[0]  = EXCHANGE_MEDIUM;
 477         cmd[1]  = (ch->device->lun & 0x7) << 5;
 478         cmd[2]  = (trans >> 8) & 0xff;
 479         cmd[3]  =  trans       & 0xff;
 480         cmd[4]  = (src   >> 8) & 0xff;
 481         cmd[5]  =  src         & 0xff;
 482         cmd[6]  = (dest1 >> 8) & 0xff;
 483         cmd[7]  =  dest1       & 0xff;
 484         cmd[8]  = (dest2 >> 8) & 0xff;
 485         cmd[9]  =  dest2       & 0xff;
 486         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 487
 488         return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
 489 }
 490
 491 static void
 492 ch_check_voltag(char *tag)
 493 {
 494         int i;
 495
 496         for (i = 0; i < 32; i++) {
 497                 /* restrict to ascii */
 498                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 499                         tag[i] = ' ';
 500                 /* don't allow search wildcards */
 501                 if (tag[i] == '?' ||
 502                     tag[i] == '*')
 503                         tag[i] = ' ';
 504         }
 505 }
 506
 507 static int
 508 ch_set_voltag(scsi_changer *ch, u_int elem,
 509               int alternate, int clear, u_char *tag)
 510 {
 511         u_char  cmd[12];
 512         u_char  *buffer;
 513         int result;
 514
 515         buffer = kzalloc(512, GFP_KERNEL);
 516         if (!buffer)
 517                 return -ENOMEM;
 518
 519         DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
 520                 clear     ? "clear"     : "set",
 521                 alternate ? "alternate" : "primary",
 522                 elem, tag);
 523         memset(cmd,0,sizeof(cmd));
 524         cmd[0]  = SEND_VOLUME_TAG;
 525         cmd[1] = ((ch->device->lun & 0x7) << 5) |
 526                 ch_elem_to_typecode(ch,elem);
 527         cmd[2] = (elem >> 8) & 0xff;
 528         cmd[3] = elem        & 0xff;
 529         cmd[5] = clear
 530                 ? (alternate ? 0x0d : 0x0c)
 531                 : (alternate ? 0x0b : 0x0a);
 532
 533         cmd[9] = 255;
 534
 535         memcpy(buffer,tag,32);
 536         ch_check_voltag(buffer);
 537
 538         result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
 539         kfree(buffer);
 540         return result;
 541 }
 542
 543 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 544 {
 545         int retval = 0;
 546         u_char data[16];
 547         unsigned int i;
 548
 549         mutex_lock(&ch->lock);
 550         for (i = 0; i < ch->counts[type]; i++) {
 551                 if (0 != ch_read_element_status
 552                     (ch, ch->firsts[type]+i,data)) {
 553                         retval = -EIO;
 554                         break;
 555                 }
 556                 put_user(data[2], dest+i);
 557                 if (data[2] & CESTATUS_EXCEPT)
 558                         VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
 559                                 ch->firsts[type]+i,
 560                                 (int)data[4],(int)data[5]);
 561                 retval = ch_read_element_status
 562                         (ch, ch->firsts[type]+i,data);
 563                 if (0 != retval)
 564                         break;
 565         }
 566         mutex_unlock(&ch->lock);
 567         return retval;
 568 }
 569
 570 /* ------------------------------------------------------------------------ */
 571
 572 static int
 573 ch_release(struct inode *inode, struct file *file)
 574 {
 575         scsi_changer *ch = file->private_data;
 576
 577         scsi_device_put(ch->device);
 578         file->private_data = NULL;
 579         return 0;
 580 }
 581
 582 static int
 583 ch_open(struct inode *inode, struct file *file)
 584 {
 585         scsi_changer *ch;
 586         int minor = iminor(inode);
 587
 588         mutex_lock(&ch_mutex);
 589         spin_lock(&ch_index_lock);
 590         ch = idr_find(&ch_index_idr, minor);
 591
 592         if (NULL == ch || scsi_device_get(ch->device)) {
 593                 spin_unlock(&ch_index_lock);
 594                 mutex_unlock(&ch_mutex);
 595                 return -ENXIO;
 596         }
 597         spin_unlock(&ch_index_lock);
 598
 599         file->private_data = ch;
 600         mutex_unlock(&ch_mutex);
 601         return 0;
 602 }
 603
 604 static int
 605 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 606 {
 607         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 608                 return -1;
 609         return 0;
 610 }
 611
 612 static long ch_ioctl(struct file *file,
 613                     unsigned int cmd, unsigned long arg)
 614 {
 615         scsi_changer *ch = file->private_data;
 616         int retval;
 617         void __user *argp = (void __user *)arg;
 618
 619         retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
 620                         file->f_flags & O_NDELAY);
 621         if (retval)
 622                 return retval;
 623
 624         switch (cmd) {
 625         case CHIOGPARAMS:
 626         {
 627                 struct changer_params params;
 628
 629                 params.cp_curpicker = 0;
 630                 params.cp_npickers  = ch->counts[CHET_MT];
 631                 params.cp_nslots    = ch->counts[CHET_ST];
 632                 params.cp_nportals  = ch->counts[CHET_IE];
 633                 params.cp_ndrives   = ch->counts[CHET_DT];
 634
 635                 if (copy_to_user(argp, &params, sizeof(params)))
 636                         return -EFAULT;
 637                 return 0;
 638         }
 639         case CHIOGVPARAMS:
 640         {
 641                 struct changer_vendor_params vparams;
 642
 643                 memset(&vparams,0,sizeof(vparams));
 644                 if (ch->counts[CHET_V1]) {
 645                         vparams.cvp_n1  = ch->counts[CHET_V1];
 646                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 647                 }
 648                 if (ch->counts[CHET_V2]) {
 649                         vparams.cvp_n2  = ch->counts[CHET_V2];
 650                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 651                 }
 652                 if (ch->counts[CHET_V3]) {
 653                         vparams.cvp_n3  = ch->counts[CHET_V3];
 654                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 655                 }
 656                 if (ch->counts[CHET_V4]) {
 657                         vparams.cvp_n4  = ch->counts[CHET_V4];
 658                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 659                 }
 660                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 661                         return -EFAULT;
 662                 return 0;
 663         }
 664
 665         case CHIOPOSITION:
 666         {
 667                 struct changer_position pos;
 668
 669                 if (copy_from_user(&pos, argp, sizeof (pos)))
 670                         return -EFAULT;
 671
 672                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 673                         DPRINTK("CHIOPOSITION: invalid parameter\n");
 674                         return -EBADSLT;
 675                 }
 676                 mutex_lock(&ch->lock);
 677                 retval = ch_position(ch,0,
 678                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 679                                      pos.cp_flags & CP_INVERT);
 680                 mutex_unlock(&ch->lock);
 681                 return retval;
 682         }
 683
 684         case CHIOMOVE:
 685         {
 686                 struct changer_move mv;
 687
 688                 if (copy_from_user(&mv, argp, sizeof (mv)))
 689                         return -EFAULT;
 690
 691                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 692                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 693                         DPRINTK("CHIOMOVE: invalid parameter\n");
 694                         return -EBADSLT;
 695                 }
 696
 697                 mutex_lock(&ch->lock);
 698                 retval = ch_move(ch,0,
 699                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 700                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 701                                  mv.cm_flags & CM_INVERT);
 702                 mutex_unlock(&ch->lock);
 703                 return retval;
 704         }
 705
 706         case CHIOEXCHANGE:
 707         {
 708                 struct changer_exchange mv;
 709
 710                 if (copy_from_user(&mv, argp, sizeof (mv)))
 711                         return -EFAULT;
 712
 713                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 714                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 715                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 716                         DPRINTK("CHIOEXCHANGE: invalid parameter\n");
 717                         return -EBADSLT;
 718                 }
 719
 720                 mutex_lock(&ch->lock);
 721                 retval = ch_exchange
 722                         (ch,0,
 723                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 724                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 725                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 726                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 727                 mutex_unlock(&ch->lock);
 728                 return retval;
 729         }
 730
 731         case CHIOGSTATUS:
 732         {
 733                 struct changer_element_status ces;
 734
 735                 if (copy_from_user(&ces, argp, sizeof (ces)))
 736                         return -EFAULT;
 737                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 738                         return -EINVAL;
 739
 740                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 741         }
 742
 743         case CHIOGELEM:
 744         {
 745                 struct changer_get_element cge;
 746                 u_char ch_cmd[12];
 747                 u_char *buffer;
 748                 unsigned int elem;
 749                 int     result,i;
 750
 751                 if (copy_from_user(&cge, argp, sizeof (cge)))
 752                         return -EFAULT;
 753
 754                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 755                         return -EINVAL;
 756                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 757
 758                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 759                 if (!buffer)
 760                         return -ENOMEM;
 761                 mutex_lock(&ch->lock);
 762
 763         voltag_retry:
 764                 memset(ch_cmd, 0, sizeof(ch_cmd));
 765                 ch_cmd[0] = READ_ELEMENT_STATUS;
 766                 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
 767                         (ch->voltags ? 0x10 : 0) |
 768                         ch_elem_to_typecode(ch,elem);
 769                 ch_cmd[2] = (elem >> 8) & 0xff;
 770                 ch_cmd[3] = elem        & 0xff;
 771                 ch_cmd[5] = 1;
 772                 ch_cmd[9] = 255;
 773
 774                 result = ch_do_scsi(ch, ch_cmd, 12,
 775                                     buffer, 256, DMA_FROM_DEVICE);
 776                 if (!result) {
 777                         cge.cge_status = buffer[18];
 778                         cge.cge_flags = 0;
 779                         if (buffer[18] & CESTATUS_EXCEPT) {
 780                                 cge.cge_errno = EIO;
 781                         }
 782                         if (buffer[25] & 0x80) {
 783                                 cge.cge_flags |= CGE_SRC;
 784                                 if (buffer[25] & 0x40)
 785                                         cge.cge_flags |= CGE_INVERT;
 786                                 elem = (buffer[26]<<8) | buffer[27];
 787                                 for (i = 0; i < 4; i++) {
 788                                         if (elem >= ch->firsts[i] &&
 789                                             elem <  ch->firsts[i] + ch->counts[i]) {
 790                                                 cge.cge_srctype = i;
 791                                                 cge.cge_srcunit = elem-ch->firsts[i];
 792                                         }
 793                                 }
 794                         }
 795                         if ((buffer[22] & 0x30) == 0x30) {
 796                                 cge.cge_flags |= CGE_IDLUN;
 797                                 cge.cge_id  = buffer[23];
 798                                 cge.cge_lun = buffer[22] & 7;
 799                         }
 800                         if (buffer[9] & 0x80) {
 801                                 cge.cge_flags |= CGE_PVOLTAG;
 802                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 803                         }
 804                         if (buffer[9] & 0x40) {
 805                                 cge.cge_flags |= CGE_AVOLTAG;
 806                                 memcpy(cge.cge_avoltag,buffer+64,36);
 807                         }
 808                 } else if (ch->voltags) {
 809                         ch->voltags = 0;
 810                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
 811                         goto voltag_retry;
 812                 }
 813                 kfree(buffer);
 814                 mutex_unlock(&ch->lock);
 815
 816                 if (copy_to_user(argp, &cge, sizeof (cge)))
 817                         return -EFAULT;
 818                 return result;
 819         }
 820
 821         case CHIOINITELEM:
 822         {
 823                 mutex_lock(&ch->lock);
 824                 retval = ch_init_elem(ch);
 825                 mutex_unlock(&ch->lock);
 826                 return retval;
 827         }
 828
 829         case CHIOSVOLTAG:
 830         {
 831                 struct changer_set_voltag csv;
 832                 int elem;
 833
 834                 if (copy_from_user(&csv, argp, sizeof(csv)))
 835                         return -EFAULT;
 836
 837                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 838                         DPRINTK("CHIOSVOLTAG: invalid parameter\n");
 839                         return -EBADSLT;
 840                 }
 841                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 842                 mutex_lock(&ch->lock);
 843                 retval = ch_set_voltag(ch, elem,
 844                                        csv.csv_flags & CSV_AVOLTAG,
 845                                        csv.csv_flags & CSV_CLEARTAG,
 846                                        csv.csv_voltag);
 847                 mutex_unlock(&ch->lock);
 848                 return retval;
 849         }
 850
 851         default:
 852                 return scsi_ioctl(ch->device, cmd, argp);
 853
 854         }
 855 }
 856
 857 #ifdef CONFIG_COMPAT
 858
 859 struct changer_element_status32 {
 860         int             ces_type;
 861         compat_uptr_t   ces_data;
 862 };
 863 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 864
 865 static long ch_ioctl_compat(struct file * file,
 866                             unsigned int cmd, unsigned long arg)
 867 {
 868         scsi_changer *ch = file->private_data;
 869
 870         switch (cmd) {
 871         case CHIOGPARAMS:
 872         case CHIOGVPARAMS:
 873         case CHIOPOSITION:
 874         case CHIOMOVE:
 875         case CHIOEXCHANGE:
 876         case CHIOGELEM:
 877         case CHIOINITELEM:
 878         case CHIOSVOLTAG:
 879                 /* compatible */
 880                 return ch_ioctl(file, cmd, arg);
 881         case CHIOGSTATUS32:
 882         {
 883                 struct changer_element_status32 ces32;
 884                 unsigned char __user *data;
 885
 886                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 887                         return -EFAULT;
 888                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 889                         return -EINVAL;
 890
 891                 data = compat_ptr(ces32.ces_data);
 892                 return ch_gstatus(ch, ces32.ces_type, data);
 893         }
 894         default:
 895                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 896                 return -ENOIOCTLCMD;
 897
 898         }
 899 }
 900 #endif
 901
 902 /* ------------------------------------------------------------------------ */
 903
 904 static int ch_probe(struct device *dev)
 905 {
 906         struct scsi_device *sd = to_scsi_device(dev);
 907         struct device *class_dev;
 908         int ret;
 909         scsi_changer *ch;
 910
 911         if (sd->type != TYPE_MEDIUM_CHANGER)
 912                 return -ENODEV;
 913
 914         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 915         if (NULL == ch)
 916                 return -ENOMEM;
 917
 918         idr_preload(GFP_KERNEL);
 919         spin_lock(&ch_index_lock);
 920         ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
 921         spin_unlock(&ch_index_lock);
 922         idr_preload_end();
 923
 924         if (ret < 0) {
 925                 if (ret == -ENOSPC)
 926                         ret = -ENODEV;
 927                 goto free_ch;
 928         }
 929
 930         ch->minor = ret;
 931         sprintf(ch->name,"ch%d",ch->minor);
 932
 933         class_dev = device_create(ch_sysfs_class, dev,
 934                                   MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
 935                                   "s%s", ch->name);
 936         if (IS_ERR(class_dev)) {
 937                 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
 938                             ch->minor);
 939                 ret = PTR_ERR(class_dev);
 940                 goto remove_idr;
 941         }
 942
 943         mutex_init(&ch->lock);
 944         ch->device = sd;
 945         ch_readconfig(ch);
 946         if (init)
 947                 ch_init_elem(ch);
 948
 949         dev_set_drvdata(dev, ch);
 950         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 951
 952         return 0;
 953 remove_idr:
 954         idr_remove(&ch_index_idr, ch->minor);
 955 free_ch:
 956         kfree(ch);
 957         return ret;
 958 }
 959
 960 static int ch_remove(struct device *dev)
 961 {
 962         scsi_changer *ch = dev_get_drvdata(dev);
 963
 964         spin_lock(&ch_index_lock);
 965         idr_remove(&ch_index_idr, ch->minor);
 966         spin_unlock(&ch_index_lock);
 967
 968         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 969         kfree(ch->dt);
 970         kfree(ch);
 971         return 0;
 972 }
 973
 974 static struct scsi_driver ch_template = {
 975         .gendrv         = {
 976                 .name   = "ch",
 977                 .owner  = THIS_MODULE,
 978                 .probe  = ch_probe,
 979                 .remove = ch_remove,
 980         },
 981 };
 982
 983 static const struct file_operations changer_fops = {
 984         .owner          = THIS_MODULE,
 985         .open           = ch_open,
 986         .release        = ch_release,
 987         .unlocked_ioctl = ch_ioctl,
 988 #ifdef CONFIG_COMPAT
 989         .compat_ioctl   = ch_ioctl_compat,
 990 #endif
 991         .llseek         = noop_llseek,
 992 };
 993
 994 static int __init init_ch_module(void)
 995 {
 996         int rc;
 997
 998         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 999         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
1000         if (IS_ERR(ch_sysfs_class)) {
1001                 rc = PTR_ERR(ch_sysfs_class);
1002                 return rc;
1003         }
1004         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
1005         if (rc < 0) {
1006                 printk("Unable to get major %d for SCSI-Changer\n",
1007                        SCSI_CHANGER_MAJOR);
1008                 goto fail1;
1009         }
1010         rc = scsi_register_driver(&ch_template.gendrv);
1011         if (rc < 0)
1012                 goto fail2;
1013         return 0;
1014
1015  fail2:
1016         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1017  fail1:
1018         class_destroy(ch_sysfs_class);
1019         return rc;
1020 }
1021
1022 static void __exit exit_ch_module(void)
1023 {
1024         scsi_unregister_driver(&ch_template.gendrv);
1025         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1026         class_destroy(ch_sysfs_class);
1027         idr_destroy(&ch_index_idr);
1028 }
1029
1030 module_init(init_ch_module);
1031 module_exit(exit_ch_module);
1032
1033 /*
1034  * Local variables:
1035  * c-basic-offset: 8
1036  * End:
1037  */