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         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 198                                   buflength, &sshdr, timeout * HZ,
 199                                   MAX_RETRIES, NULL);
 200
 201         if (driver_byte(result) & DRIVER_SENSE) {
 202                 if (debug)
 203                         scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
 204                 errno = ch_find_errno(&sshdr);
 205
 206                 switch(sshdr.sense_key) {
 207                 case UNIT_ATTENTION:
 208                         ch->unit_attention = 1;
 209                         if (retries++ < 3)
 210                                 goto retry;
 211                         break;
 212                 }
 213         }
 214         return errno;
 215 }
 216
 217 /* ------------------------------------------------------------------------ */
 218
 219 static int
 220 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 221 {
 222         int i;
 223
 224         for (i = 0; i < CH_TYPES; i++) {
 225                 if (elem >= ch->firsts[i]  &&
 226                     elem <  ch->firsts[i] +
 227                     ch->counts[i])
 228                         return i+1;
 229         }
 230         return 0;
 231 }
 232
 233 static int
 234 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 235 {
 236         u_char  cmd[12];
 237         u_char  *buffer;
 238         int     result;
 239
 240         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 241         if(!buffer)
 242                 return -ENOMEM;
 243
 244  retry:
 245         memset(cmd,0,sizeof(cmd));
 246         cmd[0] = READ_ELEMENT_STATUS;
 247         cmd[1] = ((ch->device->lun & 0x7) << 5) |
 248                 (ch->voltags ? 0x10 : 0) |
 249                 ch_elem_to_typecode(ch,elem);
 250         cmd[2] = (elem >> 8) & 0xff;
 251         cmd[3] = elem        & 0xff;
 252         cmd[5] = 1;
 253         cmd[9] = 255;
 254         if (0 == (result = ch_do_scsi(ch, cmd, 12,
 255                                       buffer, 256, DMA_FROM_DEVICE))) {
 256                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 257                         DPRINTK("asked for element 0x%02x, got 0x%02x\n",
 258                                 elem,(buffer[16] << 8) | buffer[17]);
 259                         kfree(buffer);
 260                         return -EIO;
 261                 }
 262                 memcpy(data,buffer+16,16);
 263         } else {
 264                 if (ch->voltags) {
 265                         ch->voltags = 0;
 266                         VPRINTK(KERN_INFO, "device has no volume tag support\n");
 267                         goto retry;
 268                 }
 269                 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 270         }
 271         kfree(buffer);
 272         return result;
 273 }
 274
 275 static int
 276 ch_init_elem(scsi_changer *ch)
 277 {
 278         int err;
 279         u_char cmd[6];
 280
 281         VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
 282         memset(cmd,0,sizeof(cmd));
 283         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 284         cmd[1] = (ch->device->lun & 0x7) << 5;
 285         err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
 286         VPRINTK(KERN_INFO, "... finished\n");
 287         return err;
 288 }
 289
 290 static int
 291 ch_readconfig(scsi_changer *ch)
 292 {
 293         u_char  cmd[10], data[16];
 294         u_char  *buffer;
 295         int     result,id,lun,i;
 296         u_int   elem;
 297
 298         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 299         if (!buffer)
 300                 return -ENOMEM;
 301
 302         memset(cmd,0,sizeof(cmd));
 303         cmd[0] = MODE_SENSE;
 304         cmd[1] = (ch->device->lun & 0x7) << 5;
 305         cmd[2] = 0x1d;
 306         cmd[4] = 255;
 307         result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
 308         if (0 != result) {
 309                 cmd[1] |= (1<<3);
 310                 result  = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
 311         }
 312         if (0 == result) {
 313                 ch->firsts[CHET_MT] =
 314                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 315                 ch->counts[CHET_MT] =
 316                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 317                 ch->firsts[CHET_ST] =
 318                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 319                 ch->counts[CHET_ST] =
 320                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 321                 ch->firsts[CHET_IE] =
 322                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 323                 ch->counts[CHET_IE] =
 324                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 325                 ch->firsts[CHET_DT] =
 326                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 327                 ch->counts[CHET_DT] =
 328                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 329                 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
 330                         ch->firsts[CHET_MT],
 331                         ch->counts[CHET_MT]);
 332                 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
 333                         ch->firsts[CHET_ST],
 334                         ch->counts[CHET_ST]);
 335                 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
 336                         ch->firsts[CHET_IE],
 337                         ch->counts[CHET_IE]);
 338                 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
 339                         ch->firsts[CHET_DT],
 340                         ch->counts[CHET_DT]);
 341         } else {
 342                 VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
 343         }
 344
 345         /* vendor specific element types */
 346         for (i = 0; i < 4; i++) {
 347                 if (0 == vendor_counts[i])
 348                         continue;
 349                 if (NULL == vendor_labels[i])
 350                         continue;
 351                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 352                 ch->counts[CHET_V1+i] = vendor_counts[i];
 353                 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 354                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 355                         vendor_labels[i]);
 356         }
 357
 358         /* look up the devices of the data transfer elements */
 359         ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
 360                          GFP_KERNEL);
 361
 362         if (!ch->dt) {
 363                 kfree(buffer);
 364                 return -ENOMEM;
 365         }
 366
 367         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 368                 id  = -1;
 369                 lun = 0;
 370                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 371                         id  = dt_id[elem];
 372                         lun = dt_lun[elem];
 373                         VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
 374                                 elem+ch->firsts[CHET_DT]);
 375                 } else if (0 != ch_read_element_status
 376                            (ch,elem+ch->firsts[CHET_DT],data)) {
 377                         VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
 378                                 elem+ch->firsts[CHET_DT]);
 379                 } else {
 380                         VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 381                         if (data[6] & 0x80) {
 382                                 VPRINTK(KERN_CONT, "not this SCSI bus\n");
 383                                 ch->dt[elem] = NULL;
 384                         } else if (0 == (data[6] & 0x30)) {
 385                                 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
 386                                 ch->dt[elem] = NULL;
 387                         } else {
 388                                 id  = ch->device->id;
 389                                 lun = 0;
 390                                 if (data[6] & 0x20) id  = data[7];
 391                                 if (data[6] & 0x10) lun = data[6] & 7;
 392                         }
 393                 }
 394                 if (-1 != id) {
 395                         VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
 396                         ch->dt[elem] =
 397                                 scsi_device_lookup(ch->device->host,
 398                                                    ch->device->channel,
 399                                                    id,lun);
 400                         if (!ch->dt[elem]) {
 401                                 /* should not happen */
 402                                 VPRINTK(KERN_CONT, "Huh? device not found!\n");
 403                         } else {
 404                                 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
 405                                         ch->dt[elem]->vendor,
 406                                         ch->dt[elem]->model,
 407                                         ch->dt[elem]->rev);
 408                         }
 409                 }
 410         }
 411         ch->voltags = 1;
 412         kfree(buffer);
 413
 414         return 0;
 415 }
 416
 417 /* ------------------------------------------------------------------------ */
 418
 419 static int
 420 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 421 {
 422         u_char  cmd[10];
 423
 424         DPRINTK("position: 0x%x\n",elem);
 425         if (0 == trans)
 426                 trans = ch->firsts[CHET_MT];
 427         memset(cmd,0,sizeof(cmd));
 428         cmd[0]  = POSITION_TO_ELEMENT;
 429         cmd[1]  = (ch->device->lun & 0x7) << 5;
 430         cmd[2]  = (trans >> 8) & 0xff;
 431         cmd[3]  =  trans       & 0xff;
 432         cmd[4]  = (elem  >> 8) & 0xff;
 433         cmd[5]  =  elem        & 0xff;
 434         cmd[8]  = rotate ? 1 : 0;
 435         return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
 436 }
 437
 438 static int
 439 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 440 {
 441         u_char  cmd[12];
 442
 443         DPRINTK("move: 0x%x => 0x%x\n",src,dest);
 444         if (0 == trans)
 445                 trans = ch->firsts[CHET_MT];
 446         memset(cmd,0,sizeof(cmd));
 447         cmd[0]  = MOVE_MEDIUM;
 448         cmd[1]  = (ch->device->lun & 0x7) << 5;
 449         cmd[2]  = (trans >> 8) & 0xff;
 450         cmd[3]  =  trans       & 0xff;
 451         cmd[4]  = (src   >> 8) & 0xff;
 452         cmd[5]  =  src         & 0xff;
 453         cmd[6]  = (dest  >> 8) & 0xff;
 454         cmd[7]  =  dest        & 0xff;
 455         cmd[10] = rotate ? 1 : 0;
 456         return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
 457 }
 458
 459 static int
 460 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 461             u_int dest1, u_int dest2, int rotate1, int rotate2)
 462 {
 463         u_char  cmd[12];
 464
 465         DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
 466                 src,dest1,dest2);
 467         if (0 == trans)
 468                 trans = ch->firsts[CHET_MT];
 469         memset(cmd,0,sizeof(cmd));
 470         cmd[0]  = EXCHANGE_MEDIUM;
 471         cmd[1]  = (ch->device->lun & 0x7) << 5;
 472         cmd[2]  = (trans >> 8) & 0xff;
 473         cmd[3]  =  trans       & 0xff;
 474         cmd[4]  = (src   >> 8) & 0xff;
 475         cmd[5]  =  src         & 0xff;
 476         cmd[6]  = (dest1 >> 8) & 0xff;
 477         cmd[7]  =  dest1       & 0xff;
 478         cmd[8]  = (dest2 >> 8) & 0xff;
 479         cmd[9]  =  dest2       & 0xff;
 480         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 481
 482         return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
 483 }
 484
 485 static void
 486 ch_check_voltag(char *tag)
 487 {
 488         int i;
 489
 490         for (i = 0; i < 32; i++) {
 491                 /* restrict to ascii */
 492                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 493                         tag[i] = ' ';
 494                 /* don't allow search wildcards */
 495                 if (tag[i] == '?' ||
 496                     tag[i] == '*')
 497                         tag[i] = ' ';
 498         }
 499 }
 500
 501 static int
 502 ch_set_voltag(scsi_changer *ch, u_int elem,
 503               int alternate, int clear, u_char *tag)
 504 {
 505         u_char  cmd[12];
 506         u_char  *buffer;
 507         int result;
 508
 509         buffer = kzalloc(512, GFP_KERNEL);
 510         if (!buffer)
 511                 return -ENOMEM;
 512
 513         DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
 514                 clear     ? "clear"     : "set",
 515                 alternate ? "alternate" : "primary",
 516                 elem, tag);
 517         memset(cmd,0,sizeof(cmd));
 518         cmd[0]  = SEND_VOLUME_TAG;
 519         cmd[1] = ((ch->device->lun & 0x7) << 5) |
 520                 ch_elem_to_typecode(ch,elem);
 521         cmd[2] = (elem >> 8) & 0xff;
 522         cmd[3] = elem        & 0xff;
 523         cmd[5] = clear
 524                 ? (alternate ? 0x0d : 0x0c)
 525                 : (alternate ? 0x0b : 0x0a);
 526
 527         cmd[9] = 255;
 528
 529         memcpy(buffer,tag,32);
 530         ch_check_voltag(buffer);
 531
 532         result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
 533         kfree(buffer);
 534         return result;
 535 }
 536
 537 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 538 {
 539         int retval = 0;
 540         u_char data[16];
 541         unsigned int i;
 542
 543         mutex_lock(&ch->lock);
 544         for (i = 0; i < ch->counts[type]; i++) {
 545                 if (0 != ch_read_element_status
 546                     (ch, ch->firsts[type]+i,data)) {
 547                         retval = -EIO;
 548                         break;
 549                 }
 550                 put_user(data[2], dest+i);
 551                 if (data[2] & CESTATUS_EXCEPT)
 552                         VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
 553                                 ch->firsts[type]+i,
 554                                 (int)data[4],(int)data[5]);
 555                 retval = ch_read_element_status
 556                         (ch, ch->firsts[type]+i,data);
 557                 if (0 != retval)
 558                         break;
 559         }
 560         mutex_unlock(&ch->lock);
 561         return retval;
 562 }
 563
 564 /* ------------------------------------------------------------------------ */
 565
 566 static int
 567 ch_release(struct inode *inode, struct file *file)
 568 {
 569         scsi_changer *ch = file->private_data;
 570
 571         scsi_device_put(ch->device);
 572         file->private_data = NULL;
 573         return 0;
 574 }
 575
 576 static int
 577 ch_open(struct inode *inode, struct file *file)
 578 {
 579         scsi_changer *ch;
 580         int minor = iminor(inode);
 581
 582         mutex_lock(&ch_mutex);
 583         spin_lock(&ch_index_lock);
 584         ch = idr_find(&ch_index_idr, minor);
 585
 586         if (NULL == ch || scsi_device_get(ch->device)) {
 587                 spin_unlock(&ch_index_lock);
 588                 mutex_unlock(&ch_mutex);
 589                 return -ENXIO;
 590         }
 591         spin_unlock(&ch_index_lock);
 592
 593         file->private_data = ch;
 594         mutex_unlock(&ch_mutex);
 595         return 0;
 596 }
 597
 598 static int
 599 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 600 {
 601         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 602                 return -1;
 603         return 0;
 604 }
 605
 606 static long ch_ioctl(struct file *file,
 607                     unsigned int cmd, unsigned long arg)
 608 {
 609         scsi_changer *ch = file->private_data;
 610         int retval;
 611         void __user *argp = (void __user *)arg;
 612
 613         retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
 614                         file->f_flags & O_NDELAY);
 615         if (retval)
 616                 return retval;
 617
 618         switch (cmd) {
 619         case CHIOGPARAMS:
 620         {
 621                 struct changer_params params;
 622
 623                 params.cp_curpicker = 0;
 624                 params.cp_npickers  = ch->counts[CHET_MT];
 625                 params.cp_nslots    = ch->counts[CHET_ST];
 626                 params.cp_nportals  = ch->counts[CHET_IE];
 627                 params.cp_ndrives   = ch->counts[CHET_DT];
 628
 629                 if (copy_to_user(argp, &params, sizeof(params)))
 630                         return -EFAULT;
 631                 return 0;
 632         }
 633         case CHIOGVPARAMS:
 634         {
 635                 struct changer_vendor_params vparams;
 636
 637                 memset(&vparams,0,sizeof(vparams));
 638                 if (ch->counts[CHET_V1]) {
 639                         vparams.cvp_n1  = ch->counts[CHET_V1];
 640                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 641                 }
 642                 if (ch->counts[CHET_V2]) {
 643                         vparams.cvp_n2  = ch->counts[CHET_V2];
 644                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 645                 }
 646                 if (ch->counts[CHET_V3]) {
 647                         vparams.cvp_n3  = ch->counts[CHET_V3];
 648                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 649                 }
 650                 if (ch->counts[CHET_V4]) {
 651                         vparams.cvp_n4  = ch->counts[CHET_V4];
 652                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 653                 }
 654                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 655                         return -EFAULT;
 656                 return 0;
 657         }
 658
 659         case CHIOPOSITION:
 660         {
 661                 struct changer_position pos;
 662
 663                 if (copy_from_user(&pos, argp, sizeof (pos)))
 664                         return -EFAULT;
 665
 666                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 667                         DPRINTK("CHIOPOSITION: invalid parameter\n");
 668                         return -EBADSLT;
 669                 }
 670                 mutex_lock(&ch->lock);
 671                 retval = ch_position(ch,0,
 672                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 673                                      pos.cp_flags & CP_INVERT);
 674                 mutex_unlock(&ch->lock);
 675                 return retval;
 676         }
 677
 678         case CHIOMOVE:
 679         {
 680                 struct changer_move mv;
 681
 682                 if (copy_from_user(&mv, argp, sizeof (mv)))
 683                         return -EFAULT;
 684
 685                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 686                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 687                         DPRINTK("CHIOMOVE: invalid parameter\n");
 688                         return -EBADSLT;
 689                 }
 690
 691                 mutex_lock(&ch->lock);
 692                 retval = ch_move(ch,0,
 693                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 694                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 695                                  mv.cm_flags & CM_INVERT);
 696                 mutex_unlock(&ch->lock);
 697                 return retval;
 698         }
 699
 700         case CHIOEXCHANGE:
 701         {
 702                 struct changer_exchange mv;
 703
 704                 if (copy_from_user(&mv, argp, sizeof (mv)))
 705                         return -EFAULT;
 706
 707                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 708                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 709                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 710                         DPRINTK("CHIOEXCHANGE: invalid parameter\n");
 711                         return -EBADSLT;
 712                 }
 713
 714                 mutex_lock(&ch->lock);
 715                 retval = ch_exchange
 716                         (ch,0,
 717                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 718                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 719                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 720                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 721                 mutex_unlock(&ch->lock);
 722                 return retval;
 723         }
 724
 725         case CHIOGSTATUS:
 726         {
 727                 struct changer_element_status ces;
 728
 729                 if (copy_from_user(&ces, argp, sizeof (ces)))
 730                         return -EFAULT;
 731                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 732                         return -EINVAL;
 733
 734                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 735         }
 736
 737         case CHIOGELEM:
 738         {
 739                 struct changer_get_element cge;
 740                 u_char ch_cmd[12];
 741                 u_char *buffer;
 742                 unsigned int elem;
 743                 int     result,i;
 744
 745                 if (copy_from_user(&cge, argp, sizeof (cge)))
 746                         return -EFAULT;
 747
 748                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 749                         return -EINVAL;
 750                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 751
 752                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 753                 if (!buffer)
 754                         return -ENOMEM;
 755                 mutex_lock(&ch->lock);
 756
 757         voltag_retry:
 758                 memset(ch_cmd, 0, sizeof(ch_cmd));
 759                 ch_cmd[0] = READ_ELEMENT_STATUS;
 760                 ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
 761                         (ch->voltags ? 0x10 : 0) |
 762                         ch_elem_to_typecode(ch,elem);
 763                 ch_cmd[2] = (elem >> 8) & 0xff;
 764                 ch_cmd[3] = elem        & 0xff;
 765                 ch_cmd[5] = 1;
 766                 ch_cmd[9] = 255;
 767
 768                 result = ch_do_scsi(ch, ch_cmd, 12,
 769                                     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         .gendrv         = {
 970                 .name   = "ch",
 971                 .owner  = THIS_MODULE,
 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  */