git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/ch.c

   1 /*
   2  * SCSI Media Changer device driver for Linux 2.6
   3  *
   4  *     (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
   5  *
   6  */
   7
   8 #define VERSION "0.25"
   9
  10 #include <linux/config.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/mm.h>
  17 #include <linux/major.h>
  18 #include <linux/string.h>
  19 #include <linux/errno.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/completion.h>
  23 #include <linux/compat.h>
  24 #include <linux/chio.h>                 /* here are all the ioctls */
  25 #include <linux/mutex.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
  39 MODULE_DESCRIPTION("device driver for scsi media changer devices");
  40 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
  41 MODULE_LICENSE("GPL");
  42
  43 static int init = 1;
  44 module_param(init, int, 0444);
  45 MODULE_PARM_DESC(init, \
  46     "initialize element status on driver load (default: on)");
  47
  48 static int timeout_move = 300;
  49 module_param(timeout_move, int, 0644);
  50 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
  51                  "(default: 300 seconds)");
  52
  53 static int timeout_init = 3600;
  54 module_param(timeout_init, int, 0644);
  55 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
  56                  "(default: 3600 seconds)");
  57
  58 static int verbose = 1;
  59 module_param(verbose, int, 0644);
  60 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
  61
  62 static int debug = 0;
  63 module_param(debug, int, 0644);
  64 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
  65                  "detailed sense codes on scsi errors (default: off)");
  66
  67 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
  68 static int dt_lun[CH_DT_MAX];
  69 module_param_array(dt_id,  int, NULL, 0444);
  70 module_param_array(dt_lun, int, NULL, 0444);
  71
  72 /* tell the driver about vendor-specific slots */
  73 static int vendor_firsts[CH_TYPES-4];
  74 static int vendor_counts[CH_TYPES-4];
  75 module_param_array(vendor_firsts, int, NULL, 0444);
  76 module_param_array(vendor_counts, int, NULL, 0444);
  77
  78 static const char * vendor_labels[CH_TYPES-4] = {
  79         "v0", "v1", "v2", "v3"
  80 };
  81 // module_param_string_array(vendor_labels, NULL, 0444);
  82
  83 #define dprintk(fmt, arg...)    if (debug) \
  84         printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
  85 #define vprintk(fmt, arg...)    if (verbose) \
  86         printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
  87
  88 /* ------------------------------------------------------------------- */
  89
  90 #define MAX_RETRIES   1
  91
  92 static int  ch_probe(struct device *);
  93 static int  ch_remove(struct device *);
  94 static int  ch_open(struct inode * inode, struct file * filp);
  95 static int  ch_release(struct inode * inode, struct file * filp);
  96 static int  ch_ioctl(struct inode * inode, struct file * filp,
  97                      unsigned int cmd, unsigned long arg);
  98 #ifdef CONFIG_COMPAT
  99 static long ch_ioctl_compat(struct file * filp,
 100                             unsigned int cmd, unsigned long arg);
 101 #endif
 102
 103 static struct class * ch_sysfs_class;
 104
 105 typedef struct {
 106         struct list_head    list;
 107         int                 minor;
 108         char                name[8];
 109         struct scsi_device  *device;
 110         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 111         u_int               firsts[CH_TYPES];
 112         u_int               counts[CH_TYPES];
 113         u_int               unit_attention;
 114         u_int               voltags;
 115         struct mutex        lock;
 116 } scsi_changer;
 117
 118 static LIST_HEAD(ch_devlist);
 119 static DEFINE_SPINLOCK(ch_devlist_lock);
 120 static int ch_devcount;
 121
 122 static struct scsi_driver ch_template =
 123 {
 124         .owner          = THIS_MODULE,
 125         .gendrv         = {
 126                 .name   = "ch",
 127                 .probe  = ch_probe,
 128                 .remove = ch_remove,
 129         },
 130 };
 131
 132 static struct file_operations changer_fops =
 133 {
 134         .owner        = THIS_MODULE,
 135         .open         = ch_open,
 136         .release      = ch_release,
 137         .ioctl        = ch_ioctl,
 138 #ifdef CONFIG_COMPAT
 139         .compat_ioctl = ch_ioctl_compat,
 140 #endif
 141 };
 142
 143 static const struct {
 144         unsigned char  sense;
 145         unsigned char  asc;
 146         unsigned char  ascq;
 147         int            errno;
 148 } err[] = {
 149 /* Just filled in what looks right. Hav'nt checked any standard paper for
 150    these errno assignments, so they may be wrong... */
 151         {
 152                 .sense  = ILLEGAL_REQUEST,
 153                 .asc    = 0x21,
 154                 .ascq   = 0x01,
 155                 .errno  = EBADSLT, /* Invalid element address */
 156         },{
 157                 .sense  = ILLEGAL_REQUEST,
 158                 .asc    = 0x28,
 159                 .ascq   = 0x01,
 160                 .errno  = EBADE,   /* Import or export element accessed */
 161         },{
 162                 .sense  = ILLEGAL_REQUEST,
 163                 .asc    = 0x3B,
 164                 .ascq   = 0x0D,
 165                 .errno  = EXFULL,  /* Medium destination element full */
 166         },{
 167                 .sense  = ILLEGAL_REQUEST,
 168                 .asc    = 0x3B,
 169                 .ascq   = 0x0E,
 170                 .errno  = EBADE,   /* Medium source element empty */
 171         },{
 172                 .sense  = ILLEGAL_REQUEST,
 173                 .asc    = 0x20,
 174                 .ascq   = 0x00,
 175                 .errno  = EBADRQC, /* Invalid command operation code */
 176         },{
 177                 /* end of list */
 178         }
 179 };
 180
 181 /* ------------------------------------------------------------------- */
 182
 183 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 184 {
 185         int i,errno = 0;
 186
 187         /* Check to see if additional sense information is available */
 188         if (scsi_sense_valid(sshdr) &&
 189             sshdr->asc != 0) {
 190                 for (i = 0; err[i].errno != 0; i++) {
 191                         if (err[i].sense == sshdr->sense_key &&
 192                             err[i].asc   == sshdr->asc &&
 193                             err[i].ascq  == sshdr->ascq) {
 194                                 errno = -err[i].errno;
 195                                 break;
 196                         }
 197                 }
 198         }
 199         if (errno == 0)
 200                 errno = -EIO;
 201         return errno;
 202 }
 203
 204 static int
 205 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 206            void *buffer, unsigned buflength,
 207            enum dma_data_direction direction)
 208 {
 209         int errno, retries = 0, timeout, result;
 210         struct scsi_sense_hdr sshdr;
 211
 212         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 213                 ? timeout_init : timeout_move;
 214
 215  retry:
 216         errno = 0;
 217         if (debug) {
 218                 dprintk("command: ");
 219                 __scsi_print_command(cmd);
 220         }
 221
 222         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 223                                   buflength, &sshdr, timeout * HZ,
 224                                   MAX_RETRIES);
 225
 226         dprintk("result: 0x%x\n",result);
 227         if (driver_byte(result) & DRIVER_SENSE) {
 228                 if (debug)
 229                         scsi_print_sense_hdr(ch->name, &sshdr);
 230                 errno = ch_find_errno(&sshdr);
 231
 232                 switch(sshdr.sense_key) {
 233                 case UNIT_ATTENTION:
 234                         ch->unit_attention = 1;
 235                         if (retries++ < 3)
 236                                 goto retry;
 237                         break;
 238                 }
 239         }
 240         return errno;
 241 }
 242
 243 /* ------------------------------------------------------------------------ */
 244
 245 static int
 246 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 247 {
 248         int i;
 249
 250         for (i = 0; i < CH_TYPES; i++) {
 251                 if (elem >= ch->firsts[i]  &&
 252                     elem <  ch->firsts[i] +
 253                     ch->counts[i])
 254                         return i+1;
 255         }
 256         return 0;
 257 }
 258
 259 static int
 260 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 261 {
 262         u_char  cmd[12];
 263         u_char  *buffer;
 264         int     result;
 265
 266         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 267         if(!buffer)
 268                 return -ENOMEM;
 269
 270  retry:
 271         memset(cmd,0,sizeof(cmd));
 272         cmd[0] = READ_ELEMENT_STATUS;
 273         cmd[1] = (ch->device->lun << 5) |
 274                 (ch->voltags ? 0x10 : 0) |
 275                 ch_elem_to_typecode(ch,elem);
 276         cmd[2] = (elem >> 8) & 0xff;
 277         cmd[3] = elem        & 0xff;
 278         cmd[5] = 1;
 279         cmd[9] = 255;
 280         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 281                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 282                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 283                                 elem,(buffer[16] << 8) | buffer[17]);
 284                         kfree(buffer);
 285                         return -EIO;
 286                 }
 287                 memcpy(data,buffer+16,16);
 288         } else {
 289                 if (ch->voltags) {
 290                         ch->voltags = 0;
 291                         vprintk("device has no volume tag support\n");
 292                         goto retry;
 293                 }
 294                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 295         }
 296         kfree(buffer);
 297         return result;
 298 }
 299
 300 static int
 301 ch_init_elem(scsi_changer *ch)
 302 {
 303         int err;
 304         u_char cmd[6];
 305
 306         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 307         memset(cmd,0,sizeof(cmd));
 308         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 309         cmd[1] = ch->device->lun << 5;
 310         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 311         vprintk("... finished\n");
 312         return err;
 313 }
 314
 315 static int
 316 ch_readconfig(scsi_changer *ch)
 317 {
 318         u_char  cmd[10], data[16];
 319         u_char  *buffer;
 320         int     result,id,lun,i;
 321         u_int   elem;
 322
 323         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 324         if (!buffer)
 325                 return -ENOMEM;
 326         memset(buffer,0,512);
 327
 328         memset(cmd,0,sizeof(cmd));
 329         cmd[0] = MODE_SENSE;
 330         cmd[1] = ch->device->lun << 5;
 331         cmd[2] = 0x1d;
 332         cmd[4] = 255;
 333         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 334         if (0 != result) {
 335                 cmd[1] |= (1<<3);
 336                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 337         }
 338         if (0 == result) {
 339                 ch->firsts[CHET_MT] =
 340                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 341                 ch->counts[CHET_MT] =
 342                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 343                 ch->firsts[CHET_ST] =
 344                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 345                 ch->counts[CHET_ST] =
 346                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 347                 ch->firsts[CHET_IE] =
 348                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 349                 ch->counts[CHET_IE] =
 350                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 351                 ch->firsts[CHET_DT] =
 352                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 353                 ch->counts[CHET_DT] =
 354                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 355                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 356                         ch->firsts[CHET_MT],
 357                         ch->counts[CHET_MT]);
 358                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 359                         ch->firsts[CHET_ST],
 360                         ch->counts[CHET_ST]);
 361                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 362                         ch->firsts[CHET_IE],
 363                         ch->counts[CHET_IE]);
 364                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 365                         ch->firsts[CHET_DT],
 366                         ch->counts[CHET_DT]);
 367         } else {
 368                 vprintk("reading element address assigment page failed!\n");
 369         }
 370
 371         /* vendor specific element types */
 372         for (i = 0; i < 4; i++) {
 373                 if (0 == vendor_counts[i])
 374                         continue;
 375                 if (NULL == vendor_labels[i])
 376                         continue;
 377                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 378                 ch->counts[CHET_V1+i] = vendor_counts[i];
 379                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 380                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 381                         vendor_labels[i]);
 382         }
 383
 384         /* look up the devices of the data transfer elements */
 385         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 386                          GFP_KERNEL);
 387         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 388                 id  = -1;
 389                 lun = 0;
 390                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 391                         id  = dt_id[elem];
 392                         lun = dt_lun[elem];
 393                         vprintk("dt 0x%x: [insmod option] ",
 394                                 elem+ch->firsts[CHET_DT]);
 395                 } else if (0 != ch_read_element_status
 396                            (ch,elem+ch->firsts[CHET_DT],data)) {
 397                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 398                                 elem+ch->firsts[CHET_DT]);
 399                 } else {
 400                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 401                         if (data[6] & 0x80) {
 402                                 if (verbose)
 403                                         printk("not this SCSI bus\n");
 404                                 ch->dt[elem] = NULL;
 405                         } else if (0 == (data[6] & 0x30)) {
 406                                 if (verbose)
 407                                         printk("ID/LUN unknown\n");
 408                                 ch->dt[elem] = NULL;
 409                         } else {
 410                                 id  = ch->device->id;
 411                                 lun = 0;
 412                                 if (data[6] & 0x20) id  = data[7];
 413                                 if (data[6] & 0x10) lun = data[6] & 7;
 414                         }
 415                 }
 416                 if (-1 != id) {
 417                         if (verbose)
 418                                 printk("ID %i, LUN %i, ",id,lun);
 419                         ch->dt[elem] =
 420                                 scsi_device_lookup(ch->device->host,
 421                                                    ch->device->channel,
 422                                                    id,lun);
 423                         if (!ch->dt[elem]) {
 424                                 /* should not happen */
 425                                 if (verbose)
 426                                         printk("Huh? device not found!\n");
 427                         } else {
 428                                 if (verbose)
 429                                         printk("name: %8.8s %16.16s %4.4s\n",
 430                                                ch->dt[elem]->vendor,
 431                                                ch->dt[elem]->model,
 432                                                ch->dt[elem]->rev);
 433                         }
 434                 }
 435         }
 436         ch->voltags = 1;
 437         kfree(buffer);
 438
 439         return 0;
 440 }
 441
 442 /* ------------------------------------------------------------------------ */
 443
 444 static int
 445 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 446 {
 447         u_char  cmd[10];
 448
 449         dprintk("position: 0x%x\n",elem);
 450         if (0 == trans)
 451                 trans = ch->firsts[CHET_MT];
 452         memset(cmd,0,sizeof(cmd));
 453         cmd[0]  = POSITION_TO_ELEMENT;
 454         cmd[1]  = ch->device->lun << 5;
 455         cmd[2]  = (trans >> 8) & 0xff;
 456         cmd[3]  =  trans       & 0xff;
 457         cmd[4]  = (elem  >> 8) & 0xff;
 458         cmd[5]  =  elem        & 0xff;
 459         cmd[8]  = rotate ? 1 : 0;
 460         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 461 }
 462
 463 static int
 464 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 465 {
 466         u_char  cmd[12];
 467
 468         dprintk("move: 0x%x => 0x%x\n",src,dest);
 469         if (0 == trans)
 470                 trans = ch->firsts[CHET_MT];
 471         memset(cmd,0,sizeof(cmd));
 472         cmd[0]  = MOVE_MEDIUM;
 473         cmd[1]  = ch->device->lun << 5;
 474         cmd[2]  = (trans >> 8) & 0xff;
 475         cmd[3]  =  trans       & 0xff;
 476         cmd[4]  = (src   >> 8) & 0xff;
 477         cmd[5]  =  src         & 0xff;
 478         cmd[6]  = (dest  >> 8) & 0xff;
 479         cmd[7]  =  dest        & 0xff;
 480         cmd[10] = rotate ? 1 : 0;
 481         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 482 }
 483
 484 static int
 485 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 486             u_int dest1, u_int dest2, int rotate1, int rotate2)
 487 {
 488         u_char  cmd[12];
 489
 490         dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
 491                 src,dest1,dest2);
 492         if (0 == trans)
 493                 trans = ch->firsts[CHET_MT];
 494         memset(cmd,0,sizeof(cmd));
 495         cmd[0]  = EXCHANGE_MEDIUM;
 496         cmd[1]  = ch->device->lun << 5;
 497         cmd[2]  = (trans >> 8) & 0xff;
 498         cmd[3]  =  trans       & 0xff;
 499         cmd[4]  = (src   >> 8) & 0xff;
 500         cmd[5]  =  src         & 0xff;
 501         cmd[6]  = (dest1 >> 8) & 0xff;
 502         cmd[7]  =  dest1       & 0xff;
 503         cmd[8]  = (dest2 >> 8) & 0xff;
 504         cmd[9]  =  dest2       & 0xff;
 505         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 506
 507         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 508 }
 509
 510 static void
 511 ch_check_voltag(char *tag)
 512 {
 513         int i;
 514
 515         for (i = 0; i < 32; i++) {
 516                 /* restrict to ascii */
 517                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 518                         tag[i] = ' ';
 519                 /* don't allow search wildcards */
 520                 if (tag[i] == '?' ||
 521                     tag[i] == '*')
 522                         tag[i] = ' ';
 523         }
 524 }
 525
 526 static int
 527 ch_set_voltag(scsi_changer *ch, u_int elem,
 528               int alternate, int clear, u_char *tag)
 529 {
 530         u_char  cmd[12];
 531         u_char  *buffer;
 532         int result;
 533
 534         buffer = kmalloc(512, GFP_KERNEL);
 535         if (!buffer)
 536                 return -ENOMEM;
 537         memset(buffer,0,512);
 538
 539         dprintk("%s %s voltag: 0x%x => \"%s\"\n",
 540                 clear     ? "clear"     : "set",
 541                 alternate ? "alternate" : "primary",
 542                 elem, tag);
 543         memset(cmd,0,sizeof(cmd));
 544         cmd[0]  = SEND_VOLUME_TAG;
 545         cmd[1] = (ch->device->lun << 5) |
 546                 ch_elem_to_typecode(ch,elem);
 547         cmd[2] = (elem >> 8) & 0xff;
 548         cmd[3] = elem        & 0xff;
 549         cmd[5] = clear
 550                 ? (alternate ? 0x0d : 0x0c)
 551                 : (alternate ? 0x0b : 0x0a);
 552
 553         cmd[9] = 255;
 554
 555         memcpy(buffer,tag,32);
 556         ch_check_voltag(buffer);
 557
 558         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 559         kfree(buffer);
 560         return result;
 561 }
 562
 563 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 564 {
 565         int retval = 0;
 566         u_char data[16];
 567         unsigned int i;
 568
 569         mutex_lock(&ch->lock);
 570         for (i = 0; i < ch->counts[type]; i++) {
 571                 if (0 != ch_read_element_status
 572                     (ch, ch->firsts[type]+i,data)) {
 573                         retval = -EIO;
 574                         break;
 575                 }
 576                 put_user(data[2], dest+i);
 577                 if (data[2] & CESTATUS_EXCEPT)
 578                         vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
 579                                 ch->firsts[type]+i,
 580                                 (int)data[4],(int)data[5]);
 581                 retval = ch_read_element_status
 582                         (ch, ch->firsts[type]+i,data);
 583                 if (0 != retval)
 584                         break;
 585         }
 586         mutex_unlock(&ch->lock);
 587         return retval;
 588 }
 589
 590 /* ------------------------------------------------------------------------ */
 591
 592 static int
 593 ch_release(struct inode *inode, struct file *file)
 594 {
 595         scsi_changer *ch = file->private_data;
 596
 597         scsi_device_put(ch->device);
 598         file->private_data = NULL;
 599         return 0;
 600 }
 601
 602 static int
 603 ch_open(struct inode *inode, struct file *file)
 604 {
 605         scsi_changer *tmp, *ch;
 606         int minor = iminor(inode);
 607
 608         spin_lock(&ch_devlist_lock);
 609         ch = NULL;
 610         list_for_each_entry(tmp,&ch_devlist,list) {
 611                 if (tmp->minor == minor)
 612                         ch = tmp;
 613         }
 614         if (NULL == ch || scsi_device_get(ch->device)) {
 615                 spin_unlock(&ch_devlist_lock);
 616                 return -ENXIO;
 617         }
 618         spin_unlock(&ch_devlist_lock);
 619
 620         file->private_data = ch;
 621         return 0;
 622 }
 623
 624 static int
 625 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 626 {
 627         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 628                 return -1;
 629         return 0;
 630 }
 631
 632 static int ch_ioctl(struct inode * inode, struct file * file,
 633                     unsigned int cmd, unsigned long arg)
 634 {
 635         scsi_changer *ch = file->private_data;
 636         int retval;
 637         void __user *argp = (void __user *)arg;
 638
 639         switch (cmd) {
 640         case CHIOGPARAMS:
 641         {
 642                 struct changer_params params;
 643
 644                 params.cp_curpicker = 0;
 645                 params.cp_npickers  = ch->counts[CHET_MT];
 646                 params.cp_nslots    = ch->counts[CHET_ST];
 647                 params.cp_nportals  = ch->counts[CHET_IE];
 648                 params.cp_ndrives   = ch->counts[CHET_DT];
 649
 650                 if (copy_to_user(argp, &params, sizeof(params)))
 651                         return -EFAULT;
 652                 return 0;
 653         }
 654         case CHIOGVPARAMS:
 655         {
 656                 struct changer_vendor_params vparams;
 657
 658                 memset(&vparams,0,sizeof(vparams));
 659                 if (ch->counts[CHET_V1]) {
 660                         vparams.cvp_n1  = ch->counts[CHET_V1];
 661                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 662                 }
 663                 if (ch->counts[CHET_V2]) {
 664                         vparams.cvp_n2  = ch->counts[CHET_V2];
 665                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 666                 }
 667                 if (ch->counts[CHET_V3]) {
 668                         vparams.cvp_n3  = ch->counts[CHET_V3];
 669                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 670                 }
 671                 if (ch->counts[CHET_V4]) {
 672                         vparams.cvp_n4  = ch->counts[CHET_V4];
 673                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 674                 }
 675                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 676                         return -EFAULT;
 677                 return 0;
 678         }
 679
 680         case CHIOPOSITION:
 681         {
 682                 struct changer_position pos;
 683
 684                 if (copy_from_user(&pos, argp, sizeof (pos)))
 685                         return -EFAULT;
 686
 687                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 688                         dprintk("CHIOPOSITION: invalid parameter\n");
 689                         return -EBADSLT;
 690                 }
 691                 mutex_lock(&ch->lock);
 692                 retval = ch_position(ch,0,
 693                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 694                                      pos.cp_flags & CP_INVERT);
 695                 mutex_unlock(&ch->lock);
 696                 return retval;
 697         }
 698
 699         case CHIOMOVE:
 700         {
 701                 struct changer_move mv;
 702
 703                 if (copy_from_user(&mv, argp, sizeof (mv)))
 704                         return -EFAULT;
 705
 706                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 707                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 708                         dprintk("CHIOMOVE: invalid parameter\n");
 709                         return -EBADSLT;
 710                 }
 711
 712                 mutex_lock(&ch->lock);
 713                 retval = ch_move(ch,0,
 714                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 715                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 716                                  mv.cm_flags & CM_INVERT);
 717                 mutex_unlock(&ch->lock);
 718                 return retval;
 719         }
 720
 721         case CHIOEXCHANGE:
 722         {
 723                 struct changer_exchange mv;
 724
 725                 if (copy_from_user(&mv, argp, sizeof (mv)))
 726                         return -EFAULT;
 727
 728                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 729                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 730                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 731                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 732                         return -EBADSLT;
 733                 }
 734
 735                 mutex_lock(&ch->lock);
 736                 retval = ch_exchange
 737                         (ch,0,
 738                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 739                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 740                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 741                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 742                 mutex_unlock(&ch->lock);
 743                 return retval;
 744         }
 745
 746         case CHIOGSTATUS:
 747         {
 748                 struct changer_element_status ces;
 749
 750                 if (copy_from_user(&ces, argp, sizeof (ces)))
 751                         return -EFAULT;
 752                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 753                         return -EINVAL;
 754
 755                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 756         }
 757
 758         case CHIOGELEM:
 759         {
 760                 struct changer_get_element cge;
 761                 u_char  cmd[12];
 762                 u_char  *buffer;
 763                 unsigned int elem;
 764                 int     result,i;
 765
 766                 if (copy_from_user(&cge, argp, sizeof (cge)))
 767                         return -EFAULT;
 768
 769                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 770                         return -EINVAL;
 771                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 772
 773                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 774                 if (!buffer)
 775                         return -ENOMEM;
 776                 mutex_lock(&ch->lock);
 777
 778         voltag_retry:
 779                 memset(cmd,0,sizeof(cmd));
 780                 cmd[0] = READ_ELEMENT_STATUS;
 781                 cmd[1] = (ch->device->lun << 5) |
 782                         (ch->voltags ? 0x10 : 0) |
 783                         ch_elem_to_typecode(ch,elem);
 784                 cmd[2] = (elem >> 8) & 0xff;
 785                 cmd[3] = elem        & 0xff;
 786                 cmd[5] = 1;
 787                 cmd[9] = 255;
 788
 789                 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 790                         cge.cge_status = buffer[18];
 791                         cge.cge_flags = 0;
 792                         if (buffer[18] & CESTATUS_EXCEPT) {
 793                                 cge.cge_errno = EIO;
 794                         }
 795                         if (buffer[25] & 0x80) {
 796                                 cge.cge_flags |= CGE_SRC;
 797                                 if (buffer[25] & 0x40)
 798                                         cge.cge_flags |= CGE_INVERT;
 799                                 elem = (buffer[26]<<8) | buffer[27];
 800                                 for (i = 0; i < 4; i++) {
 801                                         if (elem >= ch->firsts[i] &&
 802                                             elem <  ch->firsts[i] + ch->counts[i]) {
 803                                                 cge.cge_srctype = i;
 804                                                 cge.cge_srcunit = elem-ch->firsts[i];
 805                                         }
 806                                 }
 807                         }
 808                         if ((buffer[22] & 0x30) == 0x30) {
 809                                 cge.cge_flags |= CGE_IDLUN;
 810                                 cge.cge_id  = buffer[23];
 811                                 cge.cge_lun = buffer[22] & 7;
 812                         }
 813                         if (buffer[9] & 0x80) {
 814                                 cge.cge_flags |= CGE_PVOLTAG;
 815                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 816                         }
 817                         if (buffer[9] & 0x40) {
 818                                 cge.cge_flags |= CGE_AVOLTAG;
 819                                 memcpy(cge.cge_avoltag,buffer+64,36);
 820                         }
 821                 } else if (ch->voltags) {
 822                         ch->voltags = 0;
 823                         vprintk("device has no volume tag support\n");
 824                         goto voltag_retry;
 825                 }
 826                 kfree(buffer);
 827                 mutex_unlock(&ch->lock);
 828
 829                 if (copy_to_user(argp, &cge, sizeof (cge)))
 830                         return -EFAULT;
 831                 return result;
 832         }
 833
 834         case CHIOINITELEM:
 835         {
 836                 mutex_lock(&ch->lock);
 837                 retval = ch_init_elem(ch);
 838                 mutex_unlock(&ch->lock);
 839                 return retval;
 840         }
 841
 842         case CHIOSVOLTAG:
 843         {
 844                 struct changer_set_voltag csv;
 845                 int elem;
 846
 847                 if (copy_from_user(&csv, argp, sizeof(csv)))
 848                         return -EFAULT;
 849
 850                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 851                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 852                         return -EBADSLT;
 853                 }
 854                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 855                 mutex_lock(&ch->lock);
 856                 retval = ch_set_voltag(ch, elem,
 857                                        csv.csv_flags & CSV_AVOLTAG,
 858                                        csv.csv_flags & CSV_CLEARTAG,
 859                                        csv.csv_voltag);
 860                 mutex_unlock(&ch->lock);
 861                 return retval;
 862         }
 863
 864         default:
 865                 return scsi_ioctl(ch->device, cmd, argp);
 866
 867         }
 868 }
 869
 870 #ifdef CONFIG_COMPAT
 871
 872 struct changer_element_status32 {
 873         int             ces_type;
 874         compat_uptr_t   ces_data;
 875 };
 876 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 877
 878 static long ch_ioctl_compat(struct file * file,
 879                             unsigned int cmd, unsigned long arg)
 880 {
 881         scsi_changer *ch = file->private_data;
 882
 883         switch (cmd) {
 884         case CHIOGPARAMS:
 885         case CHIOGVPARAMS:
 886         case CHIOPOSITION:
 887         case CHIOMOVE:
 888         case CHIOEXCHANGE:
 889         case CHIOGELEM:
 890         case CHIOINITELEM:
 891         case CHIOSVOLTAG:
 892                 /* compatible */
 893                 return ch_ioctl(NULL /* inode, unused */,
 894                                 file, cmd, arg);
 895         case CHIOGSTATUS32:
 896         {
 897                 struct changer_element_status32 ces32;
 898                 unsigned char __user *data;
 899
 900                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 901                         return -EFAULT;
 902                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 903                         return -EINVAL;
 904
 905                 data = compat_ptr(ces32.ces_data);
 906                 return ch_gstatus(ch, ces32.ces_type, data);
 907         }
 908         default:
 909                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 910                 return -ENOIOCTLCMD;
 911
 912         }
 913 }
 914 #endif
 915
 916 /* ------------------------------------------------------------------------ */
 917
 918 static int ch_probe(struct device *dev)
 919 {
 920         struct scsi_device *sd = to_scsi_device(dev);
 921         scsi_changer *ch;
 922
 923         if (sd->type != TYPE_MEDIUM_CHANGER)
 924                 return -ENODEV;
 925
 926         ch = kmalloc(sizeof(*ch), GFP_KERNEL);
 927         if (NULL == ch)
 928                 return -ENOMEM;
 929
 930         memset(ch,0,sizeof(*ch));
 931         ch->minor = ch_devcount;
 932         sprintf(ch->name,"ch%d",ch->minor);
 933         mutex_init(&ch->lock);
 934         ch->device = sd;
 935         ch_readconfig(ch);
 936         if (init)
 937                 ch_init_elem(ch);
 938
 939         class_device_create(ch_sysfs_class, NULL,
 940                             MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
 941                             dev, "s%s", ch->name);
 942
 943         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 944
 945         spin_lock(&ch_devlist_lock);
 946         list_add_tail(&ch->list,&ch_devlist);
 947         ch_devcount++;
 948         spin_unlock(&ch_devlist_lock);
 949         return 0;
 950 }
 951
 952 static int ch_remove(struct device *dev)
 953 {
 954         struct scsi_device *sd = to_scsi_device(dev);
 955         scsi_changer *tmp, *ch;
 956
 957         spin_lock(&ch_devlist_lock);
 958         ch = NULL;
 959         list_for_each_entry(tmp,&ch_devlist,list) {
 960                 if (tmp->device == sd)
 961                         ch = tmp;
 962         }
 963         BUG_ON(NULL == ch);
 964         list_del(&ch->list);
 965         spin_unlock(&ch_devlist_lock);
 966
 967         class_device_destroy(ch_sysfs_class,
 968                              MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 969         kfree(ch->dt);
 970         kfree(ch);
 971         ch_devcount--;
 972         return 0;
 973 }
 974
 975 static int __init init_ch_module(void)
 976 {
 977         int rc;
 978
 979         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 980         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 981         if (IS_ERR(ch_sysfs_class)) {
 982                 rc = PTR_ERR(ch_sysfs_class);
 983                 return rc;
 984         }
 985         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 986         if (rc < 0) {
 987                 printk("Unable to get major %d for SCSI-Changer\n",
 988                        SCSI_CHANGER_MAJOR);
 989                 goto fail1;
 990         }
 991         rc = scsi_register_driver(&ch_template.gendrv);
 992         if (rc < 0)
 993                 goto fail2;
 994         return 0;
 995
 996  fail2:
 997         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
 998  fail1:
 999         class_destroy(ch_sysfs_class);
1000         return rc;
1001 }
1002
1003 static void __exit exit_ch_module(void)
1004 {
1005         scsi_unregister_driver(&ch_template.gendrv);
1006         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1007         class_destroy(ch_sysfs_class);
1008 }
1009
1010 module_init(init_ch_module);
1011 module_exit(exit_ch_module);
1012
1013 /*
1014  * Local variables:
1015  * c-basic-offset: 8
1016  * End:
1017  */