drivers/scsi/ch.c

   1 /*
   2  * SCSI Media Changer device driver for Linux 2.6
   3  *
   4  *     (c) 1996-2003 Gerd Knorr <[email protected]>
   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 <[email protected]>");
  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_printk(prefix, (ch)->device, "[%s] " fmt, \
  89                     (ch)->name, ##a)
  90
  91 #define DPRINTK(fmt, arg...)                                            \
  92 do {                                                                    \
  93         if (debug)                                                      \
  94                 ch_printk(KERN_DEBUG, ch, fmt, ##arg);                  \
  95 } while (0)
  96 #define VPRINTK(level, fmt, arg...)                                     \
  97 do {                                                                    \
  98         if (verbose)                                                    \
  99                 ch_printk(level, ch, fmt, ##arg);                       \
 100 } while (0)
 101
 102 /* ------------------------------------------------------------------- */
 103
 104 #define MAX_RETRIES   1
 105
 106 static struct class * ch_sysfs_class;
 107
 108 typedef struct {
 109         struct list_head    list;
 110         int                 minor;
 111         char                name[8];
 112         struct scsi_device  *device;
 113         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 114         u_int               firsts[CH_TYPES];
 115         u_int               counts[CH_TYPES];
 116         u_int               unit_attention;
 117         u_int               voltags;
 118         struct mutex        lock;
 119 } scsi_changer;
 120
 121 static DEFINE_IDR(ch_index_idr);
 122 static DEFINE_SPINLOCK(ch_index_lock);
 123
 124 static const struct {
 125         unsigned char  sense;
 126         unsigned char  asc;
 127         unsigned char  ascq;
 128         int            errno;
 129 } ch_err[] = {
 130 /* Just filled in what looks right. Hav'nt checked any standard paper for
 131    these errno assignments, so they may be wrong... */
 132         {
 133                 .sense  = ILLEGAL_REQUEST,
 134                 .asc    = 0x21,
 135                 .ascq   = 0x01,
 136                 .errno  = EBADSLT, /* Invalid element address */
 137         },{
 138                 .sense  = ILLEGAL_REQUEST,
 139                 .asc    = 0x28,
 140                 .ascq   = 0x01,
 141                 .errno  = EBADE,   /* Import or export element accessed */
 142         },{
 143                 .sense  = ILLEGAL_REQUEST,
 144                 .asc    = 0x3B,
 145                 .ascq   = 0x0D,
 146                 .errno  = EXFULL,  /* Medium destination element full */
 147         },{
 148                 .sense  = ILLEGAL_REQUEST,
 149                 .asc    = 0x3B,
 150                 .ascq   = 0x0E,
 151                 .errno  = EBADE,   /* Medium source element empty */
 152         },{
 153                 .sense  = ILLEGAL_REQUEST,
 154                 .asc    = 0x20,
 155                 .ascq   = 0x00,
 156                 .errno  = EBADRQC, /* Invalid command operation code */
 157         },{
 158                 /* end of list */
 159         }
 160 };
 161
 162 /* ------------------------------------------------------------------- */
 163
 164 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 165 {
 166         int i,errno = 0;
 167
 168         /* Check to see if additional sense information is available */
 169         if (scsi_sense_valid(sshdr) &&
 170             sshdr->asc != 0) {
 171                 for (i = 0; ch_err[i].errno != 0; i++) {
 172                         if (ch_err[i].sense == sshdr->sense_key &&
 173                             ch_err[i].asc   == sshdr->asc &&
 174                             ch_err[i].ascq  == sshdr->ascq) {
 175                                 errno = -ch_err[i].errno;
 176                                 break;
 177                         }
 178                 }
 179         }
 180         if (errno == 0)
 181                 errno = -EIO;
 182         return errno;
 183 }
 184
 185 static int
 186 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 187            void *buffer, unsigned buflength,
 188            enum dma_data_direction direction)
 189 {
 190         int errno, retries = 0, timeout, result;
 191         struct scsi_sense_hdr sshdr;
 192
 193         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 194                 ? timeout_init : timeout_move;
 195
 196  retry:
 197         errno = 0;
 198         if (debug) {
 199                 DPRINTK("command: ");
 200                 __scsi_print_command(cmd);
 201         }
 202
 203         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 204                                   buflength, &sshdr, timeout * HZ,
 205                                   MAX_RETRIES, NULL);
 206
 207         DPRINTK("result: 0x%x\n",result);
 208         if (driver_byte(result) & DRIVER_SENSE) {
 209                 if (debug)
 210                         scsi_print_sense_hdr(ch->name, &sshdr);
 211                 errno = ch_find_errno(&sshdr);
 212
 213                 switch(sshdr.sense_key) {
 214                 case UNIT_ATTENTION:
 215                         ch->unit_attention = 1;
 216                         if (retries++ < 3)
 217                                 goto retry;
 218                         break;
 219                 }
 220         }
 221         return errno;
 222 }
 223
 224 /* ------------------------------------------------------------------------ */
 225
 226 static int
 227 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 228 {
 229         int i;
 230
 231         for (i = 0; i < CH_TYPES; i++) {
 232                 if (elem >= ch->firsts[i]  &&
 233                     elem <  ch->firsts[i] +
 234                     ch->counts[i])
 235                         return i+1;
 236         }
 237         return 0;
 238 }
 239
 240 static int
 241 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 242 {
 243         u_char  cmd[12];
 244         u_char  *buffer;
 245         int     result;
 246
 247         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 248         if(!buffer)
 249                 return -ENOMEM;
 250
 251  retry:
 252         memset(cmd,0,sizeof(cmd));
 253         cmd[0] = READ_ELEMENT_STATUS;
 254         cmd[1] = ((ch->device->lun & 0x7) << 5) |
 255                 (ch->voltags ? 0x10 : 0) |
 256                 ch_elem_to_typecode(ch,elem);
 257         cmd[2] = (elem >> 8) & 0xff;
 258         cmd[3] = elem        & 0xff;
 259         cmd[5] = 1;
 260         cmd[9] = 255;
 261         if (0 == (result = ch_do_scsi(ch, cmd, 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, 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, buffer, 255, DMA_FROM_DEVICE);
 314         if (0 != result) {
 315                 cmd[1] |= (1<<3);
 316                 result  = ch_do_scsi(ch, cmd, 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, 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, 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, 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, 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         switch (cmd) {
 620         case CHIOGPARAMS:
 621         {
 622                 struct changer_params params;
 623
 624                 params.cp_curpicker = 0;
 625                 params.cp_npickers  = ch->counts[CHET_MT];
 626                 params.cp_nslots    = ch->counts[CHET_ST];
 627                 params.cp_nportals  = ch->counts[CHET_IE];
 628                 params.cp_ndrives   = ch->counts[CHET_DT];
 629
 630                 if (copy_to_user(argp, &params, sizeof(params)))
 631                         return -EFAULT;
 632                 return 0;
 633         }
 634         case CHIOGVPARAMS:
 635         {
 636                 struct changer_vendor_params vparams;
 637
 638                 memset(&vparams,0,sizeof(vparams));
 639                 if (ch->counts[CHET_V1]) {
 640                         vparams.cvp_n1  = ch->counts[CHET_V1];
 641                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 642                 }
 643                 if (ch->counts[CHET_V2]) {
 644                         vparams.cvp_n2  = ch->counts[CHET_V2];
 645                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 646                 }
 647                 if (ch->counts[CHET_V3]) {
 648                         vparams.cvp_n3  = ch->counts[CHET_V3];
 649                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 650                 }
 651                 if (ch->counts[CHET_V4]) {
 652                         vparams.cvp_n4  = ch->counts[CHET_V4];
 653                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 654                 }
 655                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 656                         return -EFAULT;
 657                 return 0;
 658         }
 659
 660         case CHIOPOSITION:
 661         {
 662                 struct changer_position pos;
 663
 664                 if (copy_from_user(&pos, argp, sizeof (pos)))
 665                         return -EFAULT;
 666
 667                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 668                         DPRINTK("CHIOPOSITION: invalid parameter\n");
 669                         return -EBADSLT;
 670                 }
 671                 mutex_lock(&ch->lock);
 672                 retval = ch_position(ch,0,
 673                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 674                                      pos.cp_flags & CP_INVERT);
 675                 mutex_unlock(&ch->lock);
 676                 return retval;
 677         }
 678
 679         case CHIOMOVE:
 680         {
 681                 struct changer_move mv;
 682
 683                 if (copy_from_user(&mv, argp, sizeof (mv)))
 684                         return -EFAULT;
 685
 686                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 687                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 688                         DPRINTK("CHIOMOVE: invalid parameter\n");
 689                         return -EBADSLT;
 690                 }
 691
 692                 mutex_lock(&ch->lock);
 693                 retval = ch_move(ch,0,
 694                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 695                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 696                                  mv.cm_flags & CM_INVERT);
 697                 mutex_unlock(&ch->lock);
 698                 return retval;
 699         }
 700
 701         case CHIOEXCHANGE:
 702         {
 703                 struct changer_exchange mv;
 704
 705                 if (copy_from_user(&mv, argp, sizeof (mv)))
 706                         return -EFAULT;
 707
 708                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 709                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 710                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 711                         DPRINTK("CHIOEXCHANGE: invalid parameter\n");
 712                         return -EBADSLT;
 713                 }
 714
 715                 mutex_lock(&ch->lock);
 716                 retval = ch_exchange
 717                         (ch,0,
 718                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 719                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 720                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 721                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 722                 mutex_unlock(&ch->lock);
 723                 return retval;
 724         }
 725
 726         case CHIOGSTATUS:
 727         {
 728                 struct changer_element_status ces;
 729
 730                 if (copy_from_user(&ces, argp, sizeof (ces)))
 731                         return -EFAULT;
 732                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 733                         return -EINVAL;
 734
 735                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 736         }
 737
 738         case CHIOGELEM:
 739         {
 740                 struct changer_get_element cge;
 741                 u_char ch_cmd[12];
 742                 u_char *buffer;
 743                 unsigned int elem;
 744                 int     result,i;
 745
 746                 if (copy_from_user(&cge, argp, sizeof (cge)))
 747                         return -EFAULT;
 748
 749                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 750                         return -EINVAL;
 751                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 752
 753                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 754                 if (!buffer)
 755                         return -ENOMEM;
 756                 mutex_lock(&ch->lock);
 757
 758         voltag_retry:
 759                 memset(ch_cmd, 0, sizeof(ch_cmd));
 760                 ch_cmd[0] = READ_ELEMENT_STATUS;
 761                 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
 762                         (ch->voltags ? 0x10 : 0) |
 763                         ch_elem_to_typecode(ch,elem);
 764                 ch_cmd[2] = (elem >> 8) & 0xff;
 765                 ch_cmd[3] = elem        & 0xff;
 766                 ch_cmd[5] = 1;
 767                 ch_cmd[9] = 255;
 768
 769                 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
 770                 if (!result) {
 771                         cge.cge_status = buffer[18];
 772                         cge.cge_flags = 0;
 773                         if (buffer[18] & CESTATUS_EXCEPT) {
 774                                 cge.cge_errno = EIO;
 775                         }
 776                         if (buffer[25] & 0x80) {
 777                                 cge.cge_flags |= CGE_SRC;
 778                                 if (buffer[25] & 0x40)
 779                                         cge.cge_flags |= CGE_INVERT;
 780                                 elem = (buffer[26]<<8) | buffer[27];
 781                                 for (i = 0; i < 4; i++) {
 782                                         if (elem >= ch->firsts[i] &&
 783                                             elem <  ch->firsts[i] + ch->counts[i]) {
 784                                                 cge.cge_srctype = i;
 785                                                 cge.cge_srcunit = elem-ch->firsts[i];
 786                                         }
 787                                 }
 788                         }
 789                         if ((buffer[22] & 0x30) == 0x30) {
 790                                 cge.cge_flags |= CGE_IDLUN;
 791                                 cge.cge_id  = buffer[23];
 792                                 cge.cge_lun = buffer[22] & 7;
 793                         }
 794                         if (buffer[9] & 0x80) {
 795                                 cge.cge_flags |= CGE_PVOLTAG;
 796                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 797                         }
 798                         if (buffer[9] & 0x40) {
 799                                 cge.cge_flags |= CGE_AVOLTAG;
 800                                 memcpy(cge.cge_avoltag,buffer+64,36);
 801                         }
 802                 } else if (ch->voltags) {
 803                         ch->voltags = 0;
 804                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
 805                         goto voltag_retry;
 806                 }
 807                 kfree(buffer);
 808                 mutex_unlock(&ch->lock);
 809
 810                 if (copy_to_user(argp, &cge, sizeof (cge)))
 811                         return -EFAULT;
 812                 return result;
 813         }
 814
 815         case CHIOINITELEM:
 816         {
 817                 mutex_lock(&ch->lock);
 818                 retval = ch_init_elem(ch);
 819                 mutex_unlock(&ch->lock);
 820                 return retval;
 821         }
 822
 823         case CHIOSVOLTAG:
 824         {
 825                 struct changer_set_voltag csv;
 826                 int elem;
 827
 828                 if (copy_from_user(&csv, argp, sizeof(csv)))
 829                         return -EFAULT;
 830
 831                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 832                         DPRINTK("CHIOSVOLTAG: invalid parameter\n");
 833                         return -EBADSLT;
 834                 }
 835                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 836                 mutex_lock(&ch->lock);
 837                 retval = ch_set_voltag(ch, elem,
 838                                        csv.csv_flags & CSV_AVOLTAG,
 839                                        csv.csv_flags & CSV_CLEARTAG,
 840                                        csv.csv_voltag);
 841                 mutex_unlock(&ch->lock);
 842                 return retval;
 843         }
 844
 845         default:
 846                 return scsi_ioctl(ch->device, cmd, argp);
 847
 848         }
 849 }
 850
 851 #ifdef CONFIG_COMPAT
 852
 853 struct changer_element_status32 {
 854         int             ces_type;
 855         compat_uptr_t   ces_data;
 856 };
 857 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 858
 859 static long ch_ioctl_compat(struct file * file,
 860                             unsigned int cmd, unsigned long arg)
 861 {
 862         scsi_changer *ch = file->private_data;
 863
 864         switch (cmd) {
 865         case CHIOGPARAMS:
 866         case CHIOGVPARAMS:
 867         case CHIOPOSITION:
 868         case CHIOMOVE:
 869         case CHIOEXCHANGE:
 870         case CHIOGELEM:
 871         case CHIOINITELEM:
 872         case CHIOSVOLTAG:
 873                 /* compatible */
 874                 return ch_ioctl(file, cmd, arg);
 875         case CHIOGSTATUS32:
 876         {
 877                 struct changer_element_status32 ces32;
 878                 unsigned char __user *data;
 879
 880                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 881                         return -EFAULT;
 882                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 883                         return -EINVAL;
 884
 885                 data = compat_ptr(ces32.ces_data);
 886                 return ch_gstatus(ch, ces32.ces_type, data);
 887         }
 888         default:
 889                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 890                 return -ENOIOCTLCMD;
 891
 892         }
 893 }
 894 #endif
 895
 896 /* ------------------------------------------------------------------------ */
 897
 898 static int ch_probe(struct device *dev)
 899 {
 900         struct scsi_device *sd = to_scsi_device(dev);
 901         struct device *class_dev;
 902         int ret;
 903         scsi_changer *ch;
 904
 905         if (sd->type != TYPE_MEDIUM_CHANGER)
 906                 return -ENODEV;
 907
 908         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 909         if (NULL == ch)
 910                 return -ENOMEM;
 911
 912         idr_preload(GFP_KERNEL);
 913         spin_lock(&ch_index_lock);
 914         ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
 915         spin_unlock(&ch_index_lock);
 916         idr_preload_end();
 917
 918         if (ret < 0) {
 919                 if (ret == -ENOSPC)
 920                         ret = -ENODEV;
 921                 goto free_ch;
 922         }
 923
 924         ch->minor = ret;
 925         sprintf(ch->name,"ch%d",ch->minor);
 926
 927         class_dev = device_create(ch_sysfs_class, dev,
 928                                   MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
 929                                   "s%s", ch->name);
 930         if (IS_ERR(class_dev)) {
 931                 sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
 932                             ch->minor);
 933                 ret = PTR_ERR(class_dev);
 934                 goto remove_idr;
 935         }
 936
 937         mutex_init(&ch->lock);
 938         ch->device = sd;
 939         ch_readconfig(ch);
 940         if (init)
 941                 ch_init_elem(ch);
 942
 943         dev_set_drvdata(dev, ch);
 944         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 945
 946         return 0;
 947 remove_idr:
 948         idr_remove(&ch_index_idr, ch->minor);
 949 free_ch:
 950         kfree(ch);
 951         return ret;
 952 }
 953
 954 static int ch_remove(struct device *dev)
 955 {
 956         scsi_changer *ch = dev_get_drvdata(dev);
 957
 958         spin_lock(&ch_index_lock);
 959         idr_remove(&ch_index_idr, ch->minor);
 960         spin_unlock(&ch_index_lock);
 961
 962         device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 963         kfree(ch->dt);
 964         kfree(ch);
 965         return 0;
 966 }
 967
 968 static struct scsi_driver ch_template = {
 969         .owner          = THIS_MODULE,
 970         .gendrv         = {
 971                 .name   = "ch",
 972                 .probe  = ch_probe,
 973                 .remove = ch_remove,
 974         },
 975 };
 976
 977 static const struct file_operations changer_fops = {
 978         .owner          = THIS_MODULE,
 979         .open           = ch_open,
 980         .release        = ch_release,
 981         .unlocked_ioctl = ch_ioctl,
 982 #ifdef CONFIG_COMPAT
 983         .compat_ioctl   = ch_ioctl_compat,
 984 #endif
 985         .llseek         = noop_llseek,
 986 };
 987
 988 static int __init init_ch_module(void)
 989 {
 990         int rc;
 991
 992         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 993         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 994         if (IS_ERR(ch_sysfs_class)) {
 995                 rc = PTR_ERR(ch_sysfs_class);
 996                 return rc;
 997         }
 998         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 999         if (rc < 0) {
1000                 printk("Unable to get major %d for SCSI-Changer\n",
1001                        SCSI_CHANGER_MAJOR);
1002                 goto fail1;
1003         }
1004         rc = scsi_register_driver(&ch_template.gendrv);
1005         if (rc < 0)
1006                 goto fail2;
1007         return 0;
1008
1009  fail2:
1010         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1011  fail1:
1012         class_destroy(ch_sysfs_class);
1013         return rc;
1014 }
1015
1016 static void __exit exit_ch_module(void)
1017 {
1018         scsi_unregister_driver(&ch_template.gendrv);
1019         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1020         class_destroy(ch_sysfs_class);
1021         idr_destroy(&ch_index_idr);
1022 }
1023
1024 module_init(init_ch_module);
1025 module_exit(exit_ch_module);
1026
1027 /*
1028  * Local variables:
1029  * c-basic-offset: 8
1030  * End:
1031  */