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 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
  43
  44 static int init = 1;
  45 module_param(init, int, 0444);
  46 MODULE_PARM_DESC(init, \
  47     "initialize element status on driver load (default: on)");
  48
  49 static int timeout_move = 300;
  50 module_param(timeout_move, int, 0644);
  51 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
  52                  "(default: 300 seconds)");
  53
  54 static int timeout_init = 3600;
  55 module_param(timeout_init, int, 0644);
  56 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
  57                  "(default: 3600 seconds)");
  58
  59 static int verbose = 1;
  60 module_param(verbose, int, 0644);
  61 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
  62
  63 static int debug = 0;
  64 module_param(debug, int, 0644);
  65 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
  66                  "detailed sense codes on scsi errors (default: off)");
  67
  68 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
  69 static int dt_lun[CH_DT_MAX];
  70 module_param_array(dt_id,  int, NULL, 0444);
  71 module_param_array(dt_lun, int, NULL, 0444);
  72
  73 /* tell the driver about vendor-specific slots */
  74 static int vendor_firsts[CH_TYPES-4];
  75 static int vendor_counts[CH_TYPES-4];
  76 module_param_array(vendor_firsts, int, NULL, 0444);
  77 module_param_array(vendor_counts, int, NULL, 0444);
  78
  79 static const char * vendor_labels[CH_TYPES-4] = {
  80         "v0", "v1", "v2", "v3"
  81 };
  82 // module_param_string_array(vendor_labels, NULL, 0444);
  83
  84 #define dprintk(fmt, arg...)    if (debug) \
  85         printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
  86 #define vprintk(fmt, arg...)    if (verbose) \
  87         printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
  88
  89 /* ------------------------------------------------------------------- */
  90
  91 #define MAX_RETRIES   1
  92
  93 static int  ch_probe(struct device *);
  94 static int  ch_remove(struct device *);
  95 static int  ch_open(struct inode * inode, struct file * filp);
  96 static int  ch_release(struct inode * inode, struct file * filp);
  97 static int  ch_ioctl(struct inode * inode, struct file * filp,
  98                      unsigned int cmd, unsigned long arg);
  99 #ifdef CONFIG_COMPAT
 100 static long ch_ioctl_compat(struct file * filp,
 101                             unsigned int cmd, unsigned long arg);
 102 #endif
 103
 104 static struct class * ch_sysfs_class;
 105
 106 typedef struct {
 107         struct list_head    list;
 108         int                 minor;
 109         char                name[8];
 110         struct scsi_device  *device;
 111         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 112         u_int               firsts[CH_TYPES];
 113         u_int               counts[CH_TYPES];
 114         u_int               unit_attention;
 115         u_int               voltags;
 116         struct mutex        lock;
 117 } scsi_changer;
 118
 119 static LIST_HEAD(ch_devlist);
 120 static DEFINE_SPINLOCK(ch_devlist_lock);
 121 static int ch_devcount;
 122
 123 static struct scsi_driver ch_template =
 124 {
 125         .owner          = THIS_MODULE,
 126         .gendrv         = {
 127                 .name   = "ch",
 128                 .probe  = ch_probe,
 129                 .remove = ch_remove,
 130         },
 131 };
 132
 133 static struct file_operations changer_fops =
 134 {
 135         .owner        = THIS_MODULE,
 136         .open         = ch_open,
 137         .release      = ch_release,
 138         .ioctl        = ch_ioctl,
 139 #ifdef CONFIG_COMPAT
 140         .compat_ioctl = ch_ioctl_compat,
 141 #endif
 142 };
 143
 144 static const struct {
 145         unsigned char  sense;
 146         unsigned char  asc;
 147         unsigned char  ascq;
 148         int            errno;
 149 } err[] = {
 150 /* Just filled in what looks right. Hav'nt checked any standard paper for
 151    these errno assignments, so they may be wrong... */
 152         {
 153                 .sense  = ILLEGAL_REQUEST,
 154                 .asc    = 0x21,
 155                 .ascq   = 0x01,
 156                 .errno  = EBADSLT, /* Invalid element address */
 157         },{
 158                 .sense  = ILLEGAL_REQUEST,
 159                 .asc    = 0x28,
 160                 .ascq   = 0x01,
 161                 .errno  = EBADE,   /* Import or export element accessed */
 162         },{
 163                 .sense  = ILLEGAL_REQUEST,
 164                 .asc    = 0x3B,
 165                 .ascq   = 0x0D,
 166                 .errno  = EXFULL,  /* Medium destination element full */
 167         },{
 168                 .sense  = ILLEGAL_REQUEST,
 169                 .asc    = 0x3B,
 170                 .ascq   = 0x0E,
 171                 .errno  = EBADE,   /* Medium source element empty */
 172         },{
 173                 .sense  = ILLEGAL_REQUEST,
 174                 .asc    = 0x20,
 175                 .ascq   = 0x00,
 176                 .errno  = EBADRQC, /* Invalid command operation code */
 177         },{
 178                 /* end of list */
 179         }
 180 };
 181
 182 /* ------------------------------------------------------------------- */
 183
 184 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 185 {
 186         int i,errno = 0;
 187
 188         /* Check to see if additional sense information is available */
 189         if (scsi_sense_valid(sshdr) &&
 190             sshdr->asc != 0) {
 191                 for (i = 0; err[i].errno != 0; i++) {
 192                         if (err[i].sense == sshdr->sense_key &&
 193                             err[i].asc   == sshdr->asc &&
 194                             err[i].ascq  == sshdr->ascq) {
 195                                 errno = -err[i].errno;
 196                                 break;
 197                         }
 198                 }
 199         }
 200         if (errno == 0)
 201                 errno = -EIO;
 202         return errno;
 203 }
 204
 205 static int
 206 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 207            void *buffer, unsigned buflength,
 208            enum dma_data_direction direction)
 209 {
 210         int errno, retries = 0, timeout, result;
 211         struct scsi_sense_hdr sshdr;
 212
 213         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 214                 ? timeout_init : timeout_move;
 215
 216  retry:
 217         errno = 0;
 218         if (debug) {
 219                 dprintk("command: ");
 220                 __scsi_print_command(cmd);
 221         }
 222
 223         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 224                                   buflength, &sshdr, timeout * HZ,
 225                                   MAX_RETRIES);
 226
 227         dprintk("result: 0x%x\n",result);
 228         if (driver_byte(result) & DRIVER_SENSE) {
 229                 if (debug)
 230                         scsi_print_sense_hdr(ch->name, &sshdr);
 231                 errno = ch_find_errno(&sshdr);
 232
 233                 switch(sshdr.sense_key) {
 234                 case UNIT_ATTENTION:
 235                         ch->unit_attention = 1;
 236                         if (retries++ < 3)
 237                                 goto retry;
 238                         break;
 239                 }
 240         }
 241         return errno;
 242 }
 243
 244 /* ------------------------------------------------------------------------ */
 245
 246 static int
 247 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 248 {
 249         int i;
 250
 251         for (i = 0; i < CH_TYPES; i++) {
 252                 if (elem >= ch->firsts[i]  &&
 253                     elem <  ch->firsts[i] +
 254                     ch->counts[i])
 255                         return i+1;
 256         }
 257         return 0;
 258 }
 259
 260 static int
 261 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 262 {
 263         u_char  cmd[12];
 264         u_char  *buffer;
 265         int     result;
 266
 267         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 268         if(!buffer)
 269                 return -ENOMEM;
 270
 271  retry:
 272         memset(cmd,0,sizeof(cmd));
 273         cmd[0] = READ_ELEMENT_STATUS;
 274         cmd[1] = (ch->device->lun << 5) |
 275                 (ch->voltags ? 0x10 : 0) |
 276                 ch_elem_to_typecode(ch,elem);
 277         cmd[2] = (elem >> 8) & 0xff;
 278         cmd[3] = elem        & 0xff;
 279         cmd[5] = 1;
 280         cmd[9] = 255;
 281         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 282                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 283                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 284                                 elem,(buffer[16] << 8) | buffer[17]);
 285                         kfree(buffer);
 286                         return -EIO;
 287                 }
 288                 memcpy(data,buffer+16,16);
 289         } else {
 290                 if (ch->voltags) {
 291                         ch->voltags = 0;
 292                         vprintk("device has no volume tag support\n");
 293                         goto retry;
 294                 }
 295                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 296         }
 297         kfree(buffer);
 298         return result;
 299 }
 300
 301 static int
 302 ch_init_elem(scsi_changer *ch)
 303 {
 304         int err;
 305         u_char cmd[6];
 306
 307         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 308         memset(cmd,0,sizeof(cmd));
 309         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 310         cmd[1] = ch->device->lun << 5;
 311         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 312         vprintk("... finished\n");
 313         return err;
 314 }
 315
 316 static int
 317 ch_readconfig(scsi_changer *ch)
 318 {
 319         u_char  cmd[10], data[16];
 320         u_char  *buffer;
 321         int     result,id,lun,i;
 322         u_int   elem;
 323
 324         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 325         if (!buffer)
 326                 return -ENOMEM;
 327         memset(buffer,0,512);
 328
 329         memset(cmd,0,sizeof(cmd));
 330         cmd[0] = MODE_SENSE;
 331         cmd[1] = ch->device->lun << 5;
 332         cmd[2] = 0x1d;
 333         cmd[4] = 255;
 334         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 335         if (0 != result) {
 336                 cmd[1] |= (1<<3);
 337                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 338         }
 339         if (0 == result) {
 340                 ch->firsts[CHET_MT] =
 341                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 342                 ch->counts[CHET_MT] =
 343                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 344                 ch->firsts[CHET_ST] =
 345                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 346                 ch->counts[CHET_ST] =
 347                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 348                 ch->firsts[CHET_IE] =
 349                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 350                 ch->counts[CHET_IE] =
 351                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 352                 ch->firsts[CHET_DT] =
 353                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 354                 ch->counts[CHET_DT] =
 355                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 356                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 357                         ch->firsts[CHET_MT],
 358                         ch->counts[CHET_MT]);
 359                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 360                         ch->firsts[CHET_ST],
 361                         ch->counts[CHET_ST]);
 362                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 363                         ch->firsts[CHET_IE],
 364                         ch->counts[CHET_IE]);
 365                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 366                         ch->firsts[CHET_DT],
 367                         ch->counts[CHET_DT]);
 368         } else {
 369                 vprintk("reading element address assigment page failed!\n");
 370         }
 371
 372         /* vendor specific element types */
 373         for (i = 0; i < 4; i++) {
 374                 if (0 == vendor_counts[i])
 375                         continue;
 376                 if (NULL == vendor_labels[i])
 377                         continue;
 378                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 379                 ch->counts[CHET_V1+i] = vendor_counts[i];
 380                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 381                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 382                         vendor_labels[i]);
 383         }
 384
 385         /* look up the devices of the data transfer elements */
 386         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 387                          GFP_KERNEL);
 388         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 389                 id  = -1;
 390                 lun = 0;
 391                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 392                         id  = dt_id[elem];
 393                         lun = dt_lun[elem];
 394                         vprintk("dt 0x%x: [insmod option] ",
 395                                 elem+ch->firsts[CHET_DT]);
 396                 } else if (0 != ch_read_element_status
 397                            (ch,elem+ch->firsts[CHET_DT],data)) {
 398                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 399                                 elem+ch->firsts[CHET_DT]);
 400                 } else {
 401                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 402                         if (data[6] & 0x80) {
 403                                 if (verbose)
 404                                         printk("not this SCSI bus\n");
 405                                 ch->dt[elem] = NULL;
 406                         } else if (0 == (data[6] & 0x30)) {
 407                                 if (verbose)
 408                                         printk("ID/LUN unknown\n");
 409                                 ch->dt[elem] = NULL;
 410                         } else {
 411                                 id  = ch->device->id;
 412                                 lun = 0;
 413                                 if (data[6] & 0x20) id  = data[7];
 414                                 if (data[6] & 0x10) lun = data[6] & 7;
 415                         }
 416                 }
 417                 if (-1 != id) {
 418                         if (verbose)
 419                                 printk("ID %i, LUN %i, ",id,lun);
 420                         ch->dt[elem] =
 421                                 scsi_device_lookup(ch->device->host,
 422                                                    ch->device->channel,
 423                                                    id,lun);
 424                         if (!ch->dt[elem]) {
 425                                 /* should not happen */
 426                                 if (verbose)
 427                                         printk("Huh? device not found!\n");
 428                         } else {
 429                                 if (verbose)
 430                                         printk("name: %8.8s %16.16s %4.4s\n",
 431                                                ch->dt[elem]->vendor,
 432                                                ch->dt[elem]->model,
 433                                                ch->dt[elem]->rev);
 434                         }
 435                 }
 436         }
 437         ch->voltags = 1;
 438         kfree(buffer);
 439
 440         return 0;
 441 }
 442
 443 /* ------------------------------------------------------------------------ */
 444
 445 static int
 446 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 447 {
 448         u_char  cmd[10];
 449
 450         dprintk("position: 0x%x\n",elem);
 451         if (0 == trans)
 452                 trans = ch->firsts[CHET_MT];
 453         memset(cmd,0,sizeof(cmd));
 454         cmd[0]  = POSITION_TO_ELEMENT;
 455         cmd[1]  = ch->device->lun << 5;
 456         cmd[2]  = (trans >> 8) & 0xff;
 457         cmd[3]  =  trans       & 0xff;
 458         cmd[4]  = (elem  >> 8) & 0xff;
 459         cmd[5]  =  elem        & 0xff;
 460         cmd[8]  = rotate ? 1 : 0;
 461         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 462 }
 463
 464 static int
 465 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 466 {
 467         u_char  cmd[12];
 468
 469         dprintk("move: 0x%x => 0x%x\n",src,dest);
 470         if (0 == trans)
 471                 trans = ch->firsts[CHET_MT];
 472         memset(cmd,0,sizeof(cmd));
 473         cmd[0]  = MOVE_MEDIUM;
 474         cmd[1]  = ch->device->lun << 5;
 475         cmd[2]  = (trans >> 8) & 0xff;
 476         cmd[3]  =  trans       & 0xff;
 477         cmd[4]  = (src   >> 8) & 0xff;
 478         cmd[5]  =  src         & 0xff;
 479         cmd[6]  = (dest  >> 8) & 0xff;
 480         cmd[7]  =  dest        & 0xff;
 481         cmd[10] = rotate ? 1 : 0;
 482         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 483 }
 484
 485 static int
 486 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 487             u_int dest1, u_int dest2, int rotate1, int rotate2)
 488 {
 489         u_char  cmd[12];
 490
 491         dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
 492                 src,dest1,dest2);
 493         if (0 == trans)
 494                 trans = ch->firsts[CHET_MT];
 495         memset(cmd,0,sizeof(cmd));
 496         cmd[0]  = EXCHANGE_MEDIUM;
 497         cmd[1]  = ch->device->lun << 5;
 498         cmd[2]  = (trans >> 8) & 0xff;
 499         cmd[3]  =  trans       & 0xff;
 500         cmd[4]  = (src   >> 8) & 0xff;
 501         cmd[5]  =  src         & 0xff;
 502         cmd[6]  = (dest1 >> 8) & 0xff;
 503         cmd[7]  =  dest1       & 0xff;
 504         cmd[8]  = (dest2 >> 8) & 0xff;
 505         cmd[9]  =  dest2       & 0xff;
 506         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 507
 508         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 509 }
 510
 511 static void
 512 ch_check_voltag(char *tag)
 513 {
 514         int i;
 515
 516         for (i = 0; i < 32; i++) {
 517                 /* restrict to ascii */
 518                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 519                         tag[i] = ' ';
 520                 /* don't allow search wildcards */
 521                 if (tag[i] == '?' ||
 522                     tag[i] == '*')
 523                         tag[i] = ' ';
 524         }
 525 }
 526
 527 static int
 528 ch_set_voltag(scsi_changer *ch, u_int elem,
 529               int alternate, int clear, u_char *tag)
 530 {
 531         u_char  cmd[12];
 532         u_char  *buffer;
 533         int result;
 534
 535         buffer = kmalloc(512, GFP_KERNEL);
 536         if (!buffer)
 537                 return -ENOMEM;
 538         memset(buffer,0,512);
 539
 540         dprintk("%s %s voltag: 0x%x => \"%s\"\n",
 541                 clear     ? "clear"     : "set",
 542                 alternate ? "alternate" : "primary",
 543                 elem, tag);
 544         memset(cmd,0,sizeof(cmd));
 545         cmd[0]  = SEND_VOLUME_TAG;
 546         cmd[1] = (ch->device->lun << 5) |
 547                 ch_elem_to_typecode(ch,elem);
 548         cmd[2] = (elem >> 8) & 0xff;
 549         cmd[3] = elem        & 0xff;
 550         cmd[5] = clear
 551                 ? (alternate ? 0x0d : 0x0c)
 552                 : (alternate ? 0x0b : 0x0a);
 553
 554         cmd[9] = 255;
 555
 556         memcpy(buffer,tag,32);
 557         ch_check_voltag(buffer);
 558
 559         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 560         kfree(buffer);
 561         return result;
 562 }
 563
 564 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 565 {
 566         int retval = 0;
 567         u_char data[16];
 568         unsigned int i;
 569
 570         mutex_lock(&ch->lock);
 571         for (i = 0; i < ch->counts[type]; i++) {
 572                 if (0 != ch_read_element_status
 573                     (ch, ch->firsts[type]+i,data)) {
 574                         retval = -EIO;
 575                         break;
 576                 }
 577                 put_user(data[2], dest+i);
 578                 if (data[2] & CESTATUS_EXCEPT)
 579                         vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
 580                                 ch->firsts[type]+i,
 581                                 (int)data[4],(int)data[5]);
 582                 retval = ch_read_element_status
 583                         (ch, ch->firsts[type]+i,data);
 584                 if (0 != retval)
 585                         break;
 586         }
 587         mutex_unlock(&ch->lock);
 588         return retval;
 589 }
 590
 591 /* ------------------------------------------------------------------------ */
 592
 593 static int
 594 ch_release(struct inode *inode, struct file *file)
 595 {
 596         scsi_changer *ch = file->private_data;
 597
 598         scsi_device_put(ch->device);
 599         file->private_data = NULL;
 600         return 0;
 601 }
 602
 603 static int
 604 ch_open(struct inode *inode, struct file *file)
 605 {
 606         scsi_changer *tmp, *ch;
 607         int minor = iminor(inode);
 608
 609         spin_lock(&ch_devlist_lock);
 610         ch = NULL;
 611         list_for_each_entry(tmp,&ch_devlist,list) {
 612                 if (tmp->minor == minor)
 613                         ch = tmp;
 614         }
 615         if (NULL == ch || scsi_device_get(ch->device)) {
 616                 spin_unlock(&ch_devlist_lock);
 617                 return -ENXIO;
 618         }
 619         spin_unlock(&ch_devlist_lock);
 620
 621         file->private_data = ch;
 622         return 0;
 623 }
 624
 625 static int
 626 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 627 {
 628         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 629                 return -1;
 630         return 0;
 631 }
 632
 633 static int ch_ioctl(struct inode * inode, struct file * file,
 634                     unsigned int cmd, unsigned long arg)
 635 {
 636         scsi_changer *ch = file->private_data;
 637         int retval;
 638         void __user *argp = (void __user *)arg;
 639
 640         switch (cmd) {
 641         case CHIOGPARAMS:
 642         {
 643                 struct changer_params params;
 644
 645                 params.cp_curpicker = 0;
 646                 params.cp_npickers  = ch->counts[CHET_MT];
 647                 params.cp_nslots    = ch->counts[CHET_ST];
 648                 params.cp_nportals  = ch->counts[CHET_IE];
 649                 params.cp_ndrives   = ch->counts[CHET_DT];
 650
 651                 if (copy_to_user(argp, &params, sizeof(params)))
 652                         return -EFAULT;
 653                 return 0;
 654         }
 655         case CHIOGVPARAMS:
 656         {
 657                 struct changer_vendor_params vparams;
 658
 659                 memset(&vparams,0,sizeof(vparams));
 660                 if (ch->counts[CHET_V1]) {
 661                         vparams.cvp_n1  = ch->counts[CHET_V1];
 662                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 663                 }
 664                 if (ch->counts[CHET_V2]) {
 665                         vparams.cvp_n2  = ch->counts[CHET_V2];
 666                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 667                 }
 668                 if (ch->counts[CHET_V3]) {
 669                         vparams.cvp_n3  = ch->counts[CHET_V3];
 670                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 671                 }
 672                 if (ch->counts[CHET_V4]) {
 673                         vparams.cvp_n4  = ch->counts[CHET_V4];
 674                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 675                 }
 676                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 677                         return -EFAULT;
 678                 return 0;
 679         }
 680
 681         case CHIOPOSITION:
 682         {
 683                 struct changer_position pos;
 684
 685                 if (copy_from_user(&pos, argp, sizeof (pos)))
 686                         return -EFAULT;
 687
 688                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 689                         dprintk("CHIOPOSITION: invalid parameter\n");
 690                         return -EBADSLT;
 691                 }
 692                 mutex_lock(&ch->lock);
 693                 retval = ch_position(ch,0,
 694                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 695                                      pos.cp_flags & CP_INVERT);
 696                 mutex_unlock(&ch->lock);
 697                 return retval;
 698         }
 699
 700         case CHIOMOVE:
 701         {
 702                 struct changer_move mv;
 703
 704                 if (copy_from_user(&mv, argp, sizeof (mv)))
 705                         return -EFAULT;
 706
 707                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 708                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 709                         dprintk("CHIOMOVE: invalid parameter\n");
 710                         return -EBADSLT;
 711                 }
 712
 713                 mutex_lock(&ch->lock);
 714                 retval = ch_move(ch,0,
 715                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 716                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 717                                  mv.cm_flags & CM_INVERT);
 718                 mutex_unlock(&ch->lock);
 719                 return retval;
 720         }
 721
 722         case CHIOEXCHANGE:
 723         {
 724                 struct changer_exchange mv;
 725
 726                 if (copy_from_user(&mv, argp, sizeof (mv)))
 727                         return -EFAULT;
 728
 729                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 730                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 731                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 732                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 733                         return -EBADSLT;
 734                 }
 735
 736                 mutex_lock(&ch->lock);
 737                 retval = ch_exchange
 738                         (ch,0,
 739                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 740                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 741                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 742                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 743                 mutex_unlock(&ch->lock);
 744                 return retval;
 745         }
 746
 747         case CHIOGSTATUS:
 748         {
 749                 struct changer_element_status ces;
 750
 751                 if (copy_from_user(&ces, argp, sizeof (ces)))
 752                         return -EFAULT;
 753                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 754                         return -EINVAL;
 755
 756                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 757         }
 758
 759         case CHIOGELEM:
 760         {
 761                 struct changer_get_element cge;
 762                 u_char  cmd[12];
 763                 u_char  *buffer;
 764                 unsigned int elem;
 765                 int     result,i;
 766
 767                 if (copy_from_user(&cge, argp, sizeof (cge)))
 768                         return -EFAULT;
 769
 770                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 771                         return -EINVAL;
 772                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 773
 774                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 775                 if (!buffer)
 776                         return -ENOMEM;
 777                 mutex_lock(&ch->lock);
 778
 779         voltag_retry:
 780                 memset(cmd,0,sizeof(cmd));
 781                 cmd[0] = READ_ELEMENT_STATUS;
 782                 cmd[1] = (ch->device->lun << 5) |
 783                         (ch->voltags ? 0x10 : 0) |
 784                         ch_elem_to_typecode(ch,elem);
 785                 cmd[2] = (elem >> 8) & 0xff;
 786                 cmd[3] = elem        & 0xff;
 787                 cmd[5] = 1;
 788                 cmd[9] = 255;
 789
 790                 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 791                         cge.cge_status = buffer[18];
 792                         cge.cge_flags = 0;
 793                         if (buffer[18] & CESTATUS_EXCEPT) {
 794                                 cge.cge_errno = EIO;
 795                         }
 796                         if (buffer[25] & 0x80) {
 797                                 cge.cge_flags |= CGE_SRC;
 798                                 if (buffer[25] & 0x40)
 799                                         cge.cge_flags |= CGE_INVERT;
 800                                 elem = (buffer[26]<<8) | buffer[27];
 801                                 for (i = 0; i < 4; i++) {
 802                                         if (elem >= ch->firsts[i] &&
 803                                             elem <  ch->firsts[i] + ch->counts[i]) {
 804                                                 cge.cge_srctype = i;
 805                                                 cge.cge_srcunit = elem-ch->firsts[i];
 806                                         }
 807                                 }
 808                         }
 809                         if ((buffer[22] & 0x30) == 0x30) {
 810                                 cge.cge_flags |= CGE_IDLUN;
 811                                 cge.cge_id  = buffer[23];
 812                                 cge.cge_lun = buffer[22] & 7;
 813                         }
 814                         if (buffer[9] & 0x80) {
 815                                 cge.cge_flags |= CGE_PVOLTAG;
 816                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 817                         }
 818                         if (buffer[9] & 0x40) {
 819                                 cge.cge_flags |= CGE_AVOLTAG;
 820                                 memcpy(cge.cge_avoltag,buffer+64,36);
 821                         }
 822                 } else if (ch->voltags) {
 823                         ch->voltags = 0;
 824                         vprintk("device has no volume tag support\n");
 825                         goto voltag_retry;
 826                 }
 827                 kfree(buffer);
 828                 mutex_unlock(&ch->lock);
 829
 830                 if (copy_to_user(argp, &cge, sizeof (cge)))
 831                         return -EFAULT;
 832                 return result;
 833         }
 834
 835         case CHIOINITELEM:
 836         {
 837                 mutex_lock(&ch->lock);
 838                 retval = ch_init_elem(ch);
 839                 mutex_unlock(&ch->lock);
 840                 return retval;
 841         }
 842
 843         case CHIOSVOLTAG:
 844         {
 845                 struct changer_set_voltag csv;
 846                 int elem;
 847
 848                 if (copy_from_user(&csv, argp, sizeof(csv)))
 849                         return -EFAULT;
 850
 851                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 852                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 853                         return -EBADSLT;
 854                 }
 855                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 856                 mutex_lock(&ch->lock);
 857                 retval = ch_set_voltag(ch, elem,
 858                                        csv.csv_flags & CSV_AVOLTAG,
 859                                        csv.csv_flags & CSV_CLEARTAG,
 860                                        csv.csv_voltag);
 861                 mutex_unlock(&ch->lock);
 862                 return retval;
 863         }
 864
 865         default:
 866                 return scsi_ioctl(ch->device, cmd, argp);
 867
 868         }
 869 }
 870
 871 #ifdef CONFIG_COMPAT
 872
 873 struct changer_element_status32 {
 874         int             ces_type;
 875         compat_uptr_t   ces_data;
 876 };
 877 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 878
 879 static long ch_ioctl_compat(struct file * file,
 880                             unsigned int cmd, unsigned long arg)
 881 {
 882         scsi_changer *ch = file->private_data;
 883
 884         switch (cmd) {
 885         case CHIOGPARAMS:
 886         case CHIOGVPARAMS:
 887         case CHIOPOSITION:
 888         case CHIOMOVE:
 889         case CHIOEXCHANGE:
 890         case CHIOGELEM:
 891         case CHIOINITELEM:
 892         case CHIOSVOLTAG:
 893                 /* compatible */
 894                 return ch_ioctl(NULL /* inode, unused */,
 895                                 file, cmd, arg);
 896         case CHIOGSTATUS32:
 897         {
 898                 struct changer_element_status32 ces32;
 899                 unsigned char __user *data;
 900
 901                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 902                         return -EFAULT;
 903                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 904                         return -EINVAL;
 905
 906                 data = compat_ptr(ces32.ces_data);
 907                 return ch_gstatus(ch, ces32.ces_type, data);
 908         }
 909         default:
 910                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 911                 return -ENOIOCTLCMD;
 912
 913         }
 914 }
 915 #endif
 916
 917 /* ------------------------------------------------------------------------ */
 918
 919 static int ch_probe(struct device *dev)
 920 {
 921         struct scsi_device *sd = to_scsi_device(dev);
 922         scsi_changer *ch;
 923
 924         if (sd->type != TYPE_MEDIUM_CHANGER)
 925                 return -ENODEV;
 926
 927         ch = kmalloc(sizeof(*ch), GFP_KERNEL);
 928         if (NULL == ch)
 929                 return -ENOMEM;
 930
 931         memset(ch,0,sizeof(*ch));
 932         ch->minor = ch_devcount;
 933         sprintf(ch->name,"ch%d",ch->minor);
 934         mutex_init(&ch->lock);
 935         ch->device = sd;
 936         ch_readconfig(ch);
 937         if (init)
 938                 ch_init_elem(ch);
 939
 940         class_device_create(ch_sysfs_class, NULL,
 941                             MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
 942                             dev, "s%s", ch->name);
 943
 944         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 945
 946         spin_lock(&ch_devlist_lock);
 947         list_add_tail(&ch->list,&ch_devlist);
 948         ch_devcount++;
 949         spin_unlock(&ch_devlist_lock);
 950         return 0;
 951 }
 952
 953 static int ch_remove(struct device *dev)
 954 {
 955         struct scsi_device *sd = to_scsi_device(dev);
 956         scsi_changer *tmp, *ch;
 957
 958         spin_lock(&ch_devlist_lock);
 959         ch = NULL;
 960         list_for_each_entry(tmp,&ch_devlist,list) {
 961                 if (tmp->device == sd)
 962                         ch = tmp;
 963         }
 964         BUG_ON(NULL == ch);
 965         list_del(&ch->list);
 966         spin_unlock(&ch_devlist_lock);
 967
 968         class_device_destroy(ch_sysfs_class,
 969                              MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 970         kfree(ch->dt);
 971         kfree(ch);
 972         ch_devcount--;
 973         return 0;
 974 }
 975
 976 static int __init init_ch_module(void)
 977 {
 978         int rc;
 979
 980         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 981         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 982         if (IS_ERR(ch_sysfs_class)) {
 983                 rc = PTR_ERR(ch_sysfs_class);
 984                 return rc;
 985         }
 986         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 987         if (rc < 0) {
 988                 printk("Unable to get major %d for SCSI-Changer\n",
 989                        SCSI_CHANGER_MAJOR);
 990                 goto fail1;
 991         }
 992         rc = scsi_register_driver(&ch_template.gendrv);
 993         if (rc < 0)
 994                 goto fail2;
 995         return 0;
 996
 997  fail2:
 998         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
 999  fail1:
1000         class_destroy(ch_sysfs_class);
1001         return rc;
1002 }
1003
1004 static void __exit exit_ch_module(void)
1005 {
1006         scsi_unregister_driver(&ch_template.gendrv);
1007         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1008         class_destroy(ch_sysfs_class);
1009 }
1010
1011 module_init(init_ch_module);
1012 module_exit(exit_ch_module);
1013
1014 /*
1015  * Local variables:
1016  * c-basic-offset: 8
1017  * End:
1018  */