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
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_cmnd.h>
  27 #include <scsi/scsi_driver.h>
  28 #include <scsi/scsi_ioctl.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_eh.h>
  32 #include <scsi/scsi_dbg.h>
  33
  34 #define CH_DT_MAX       16
  35 #define CH_TYPES        8
  36
  37 MODULE_DESCRIPTION("device driver for scsi media changer devices");
  38 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
  39 MODULE_LICENSE("GPL");
  40 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
  41
  42 static int init = 1;
  43 module_param(init, int, 0444);
  44 MODULE_PARM_DESC(init, \
  45     "initialize element status on driver load (default: on)");
  46
  47 static int timeout_move = 300;
  48 module_param(timeout_move, int, 0644);
  49 MODULE_PARM_DESC(timeout_move,"timeout for move commands "
  50                  "(default: 300 seconds)");
  51
  52 static int timeout_init = 3600;
  53 module_param(timeout_init, int, 0644);
  54 MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
  55                  "(default: 3600 seconds)");
  56
  57 static int verbose = 1;
  58 module_param(verbose, int, 0644);
  59 MODULE_PARM_DESC(verbose,"be verbose (default: on)");
  60
  61 static int debug = 0;
  62 module_param(debug, int, 0644);
  63 MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
  64                  "detailed sense codes on scsi errors (default: off)");
  65
  66 static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
  67 static int dt_lun[CH_DT_MAX];
  68 module_param_array(dt_id,  int, NULL, 0444);
  69 module_param_array(dt_lun, int, NULL, 0444);
  70
  71 /* tell the driver about vendor-specific slots */
  72 static int vendor_firsts[CH_TYPES-4];
  73 static int vendor_counts[CH_TYPES-4];
  74 module_param_array(vendor_firsts, int, NULL, 0444);
  75 module_param_array(vendor_counts, int, NULL, 0444);
  76
  77 static const char * vendor_labels[CH_TYPES-4] = {
  78         "v0", "v1", "v2", "v3"
  79 };
  80 // module_param_string_array(vendor_labels, NULL, 0444);
  81
  82 #define dprintk(fmt, arg...)    if (debug) \
  83         printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg)
  84 #define vprintk(fmt, arg...)    if (verbose) \
  85         printk(KERN_INFO "%s: " fmt, ch->name , ## arg)
  86
  87 /* ------------------------------------------------------------------- */
  88
  89 #define MAX_RETRIES   1
  90
  91 static int  ch_probe(struct device *);
  92 static int  ch_remove(struct device *);
  93 static int  ch_open(struct inode * inode, struct file * filp);
  94 static int  ch_release(struct inode * inode, struct file * filp);
  95 static int  ch_ioctl(struct inode * inode, struct file * filp,
  96                      unsigned int cmd, unsigned long arg);
  97 #ifdef CONFIG_COMPAT
  98 static long ch_ioctl_compat(struct file * filp,
  99                             unsigned int cmd, unsigned long arg);
 100 #endif
 101
 102 static struct class * ch_sysfs_class;
 103
 104 typedef struct {
 105         struct list_head    list;
 106         int                 minor;
 107         char                name[8];
 108         struct scsi_device  *device;
 109         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 110         u_int               firsts[CH_TYPES];
 111         u_int               counts[CH_TYPES];
 112         u_int               unit_attention;
 113         u_int               voltags;
 114         struct mutex        lock;
 115 } scsi_changer;
 116
 117 static LIST_HEAD(ch_devlist);
 118 static DEFINE_SPINLOCK(ch_devlist_lock);
 119 static int ch_devcount;
 120
 121 static struct scsi_driver ch_template =
 122 {
 123         .owner          = THIS_MODULE,
 124         .gendrv         = {
 125                 .name   = "ch",
 126                 .probe  = ch_probe,
 127                 .remove = ch_remove,
 128         },
 129 };
 130
 131 static const struct file_operations changer_fops =
 132 {
 133         .owner        = THIS_MODULE,
 134         .open         = ch_open,
 135         .release      = ch_release,
 136         .ioctl        = ch_ioctl,
 137 #ifdef CONFIG_COMPAT
 138         .compat_ioctl = ch_ioctl_compat,
 139 #endif
 140 };
 141
 142 static const struct {
 143         unsigned char  sense;
 144         unsigned char  asc;
 145         unsigned char  ascq;
 146         int            errno;
 147 } err[] = {
 148 /* Just filled in what looks right. Hav'nt checked any standard paper for
 149    these errno assignments, so they may be wrong... */
 150         {
 151                 .sense  = ILLEGAL_REQUEST,
 152                 .asc    = 0x21,
 153                 .ascq   = 0x01,
 154                 .errno  = EBADSLT, /* Invalid element address */
 155         },{
 156                 .sense  = ILLEGAL_REQUEST,
 157                 .asc    = 0x28,
 158                 .ascq   = 0x01,
 159                 .errno  = EBADE,   /* Import or export element accessed */
 160         },{
 161                 .sense  = ILLEGAL_REQUEST,
 162                 .asc    = 0x3B,
 163                 .ascq   = 0x0D,
 164                 .errno  = EXFULL,  /* Medium destination element full */
 165         },{
 166                 .sense  = ILLEGAL_REQUEST,
 167                 .asc    = 0x3B,
 168                 .ascq   = 0x0E,
 169                 .errno  = EBADE,   /* Medium source element empty */
 170         },{
 171                 .sense  = ILLEGAL_REQUEST,
 172                 .asc    = 0x20,
 173                 .ascq   = 0x00,
 174                 .errno  = EBADRQC, /* Invalid command operation code */
 175         },{
 176                 /* end of list */
 177         }
 178 };
 179
 180 /* ------------------------------------------------------------------- */
 181
 182 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 183 {
 184         int i,errno = 0;
 185
 186         /* Check to see if additional sense information is available */
 187         if (scsi_sense_valid(sshdr) &&
 188             sshdr->asc != 0) {
 189                 for (i = 0; err[i].errno != 0; i++) {
 190                         if (err[i].sense == sshdr->sense_key &&
 191                             err[i].asc   == sshdr->asc &&
 192                             err[i].ascq  == sshdr->ascq) {
 193                                 errno = -err[i].errno;
 194                                 break;
 195                         }
 196                 }
 197         }
 198         if (errno == 0)
 199                 errno = -EIO;
 200         return errno;
 201 }
 202
 203 static int
 204 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 205            void *buffer, unsigned buflength,
 206            enum dma_data_direction direction)
 207 {
 208         int errno, retries = 0, timeout, result;
 209         struct scsi_sense_hdr sshdr;
 210
 211         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 212                 ? timeout_init : timeout_move;
 213
 214  retry:
 215         errno = 0;
 216         if (debug) {
 217                 dprintk("command: ");
 218                 __scsi_print_command(cmd);
 219         }
 220
 221         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 222                                   buflength, &sshdr, timeout * HZ,
 223                                   MAX_RETRIES);
 224
 225         dprintk("result: 0x%x\n",result);
 226         if (driver_byte(result) & DRIVER_SENSE) {
 227                 if (debug)
 228                         scsi_print_sense_hdr(ch->name, &sshdr);
 229                 errno = ch_find_errno(&sshdr);
 230
 231                 switch(sshdr.sense_key) {
 232                 case UNIT_ATTENTION:
 233                         ch->unit_attention = 1;
 234                         if (retries++ < 3)
 235                                 goto retry;
 236                         break;
 237                 }
 238         }
 239         return errno;
 240 }
 241
 242 /* ------------------------------------------------------------------------ */
 243
 244 static int
 245 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 246 {
 247         int i;
 248
 249         for (i = 0; i < CH_TYPES; i++) {
 250                 if (elem >= ch->firsts[i]  &&
 251                     elem <  ch->firsts[i] +
 252                     ch->counts[i])
 253                         return i+1;
 254         }
 255         return 0;
 256 }
 257
 258 static int
 259 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 260 {
 261         u_char  cmd[12];
 262         u_char  *buffer;
 263         int     result;
 264
 265         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 266         if(!buffer)
 267                 return -ENOMEM;
 268
 269  retry:
 270         memset(cmd,0,sizeof(cmd));
 271         cmd[0] = READ_ELEMENT_STATUS;
 272         cmd[1] = (ch->device->lun << 5) |
 273                 (ch->voltags ? 0x10 : 0) |
 274                 ch_elem_to_typecode(ch,elem);
 275         cmd[2] = (elem >> 8) & 0xff;
 276         cmd[3] = elem        & 0xff;
 277         cmd[5] = 1;
 278         cmd[9] = 255;
 279         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 280                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 281                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 282                                 elem,(buffer[16] << 8) | buffer[17]);
 283                         kfree(buffer);
 284                         return -EIO;
 285                 }
 286                 memcpy(data,buffer+16,16);
 287         } else {
 288                 if (ch->voltags) {
 289                         ch->voltags = 0;
 290                         vprintk("device has no volume tag support\n");
 291                         goto retry;
 292                 }
 293                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 294         }
 295         kfree(buffer);
 296         return result;
 297 }
 298
 299 static int
 300 ch_init_elem(scsi_changer *ch)
 301 {
 302         int err;
 303         u_char cmd[6];
 304
 305         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 306         memset(cmd,0,sizeof(cmd));
 307         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 308         cmd[1] = ch->device->lun << 5;
 309         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 310         vprintk("... finished\n");
 311         return err;
 312 }
 313
 314 static int
 315 ch_readconfig(scsi_changer *ch)
 316 {
 317         u_char  cmd[10], data[16];
 318         u_char  *buffer;
 319         int     result,id,lun,i;
 320         u_int   elem;
 321
 322         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 323         if (!buffer)
 324                 return -ENOMEM;
 325
 326         memset(cmd,0,sizeof(cmd));
 327         cmd[0] = MODE_SENSE;
 328         cmd[1] = ch->device->lun << 5;
 329         cmd[2] = 0x1d;
 330         cmd[4] = 255;
 331         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 332         if (0 != result) {
 333                 cmd[1] |= (1<<3);
 334                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 335         }
 336         if (0 == result) {
 337                 ch->firsts[CHET_MT] =
 338                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 339                 ch->counts[CHET_MT] =
 340                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 341                 ch->firsts[CHET_ST] =
 342                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 343                 ch->counts[CHET_ST] =
 344                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 345                 ch->firsts[CHET_IE] =
 346                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 347                 ch->counts[CHET_IE] =
 348                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 349                 ch->firsts[CHET_DT] =
 350                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 351                 ch->counts[CHET_DT] =
 352                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 353                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 354                         ch->firsts[CHET_MT],
 355                         ch->counts[CHET_MT]);
 356                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 357                         ch->firsts[CHET_ST],
 358                         ch->counts[CHET_ST]);
 359                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 360                         ch->firsts[CHET_IE],
 361                         ch->counts[CHET_IE]);
 362                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 363                         ch->firsts[CHET_DT],
 364                         ch->counts[CHET_DT]);
 365         } else {
 366                 vprintk("reading element address assigment page failed!\n");
 367         }
 368
 369         /* vendor specific element types */
 370         for (i = 0; i < 4; i++) {
 371                 if (0 == vendor_counts[i])
 372                         continue;
 373                 if (NULL == vendor_labels[i])
 374                         continue;
 375                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 376                 ch->counts[CHET_V1+i] = vendor_counts[i];
 377                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 378                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 379                         vendor_labels[i]);
 380         }
 381
 382         /* look up the devices of the data transfer elements */
 383         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 384                          GFP_KERNEL);
 385         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 386                 id  = -1;
 387                 lun = 0;
 388                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 389                         id  = dt_id[elem];
 390                         lun = dt_lun[elem];
 391                         vprintk("dt 0x%x: [insmod option] ",
 392                                 elem+ch->firsts[CHET_DT]);
 393                 } else if (0 != ch_read_element_status
 394                            (ch,elem+ch->firsts[CHET_DT],data)) {
 395                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 396                                 elem+ch->firsts[CHET_DT]);
 397                 } else {
 398                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 399                         if (data[6] & 0x80) {
 400                                 if (verbose)
 401                                         printk("not this SCSI bus\n");
 402                                 ch->dt[elem] = NULL;
 403                         } else if (0 == (data[6] & 0x30)) {
 404                                 if (verbose)
 405                                         printk("ID/LUN unknown\n");
 406                                 ch->dt[elem] = NULL;
 407                         } else {
 408                                 id  = ch->device->id;
 409                                 lun = 0;
 410                                 if (data[6] & 0x20) id  = data[7];
 411                                 if (data[6] & 0x10) lun = data[6] & 7;
 412                         }
 413                 }
 414                 if (-1 != id) {
 415                         if (verbose)
 416                                 printk("ID %i, LUN %i, ",id,lun);
 417                         ch->dt[elem] =
 418                                 scsi_device_lookup(ch->device->host,
 419                                                    ch->device->channel,
 420                                                    id,lun);
 421                         if (!ch->dt[elem]) {
 422                                 /* should not happen */
 423                                 if (verbose)
 424                                         printk("Huh? device not found!\n");
 425                         } else {
 426                                 if (verbose)
 427                                         printk("name: %8.8s %16.16s %4.4s\n",
 428                                                ch->dt[elem]->vendor,
 429                                                ch->dt[elem]->model,
 430                                                ch->dt[elem]->rev);
 431                         }
 432                 }
 433         }
 434         ch->voltags = 1;
 435         kfree(buffer);
 436
 437         return 0;
 438 }
 439
 440 /* ------------------------------------------------------------------------ */
 441
 442 static int
 443 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 444 {
 445         u_char  cmd[10];
 446
 447         dprintk("position: 0x%x\n",elem);
 448         if (0 == trans)
 449                 trans = ch->firsts[CHET_MT];
 450         memset(cmd,0,sizeof(cmd));
 451         cmd[0]  = POSITION_TO_ELEMENT;
 452         cmd[1]  = ch->device->lun << 5;
 453         cmd[2]  = (trans >> 8) & 0xff;
 454         cmd[3]  =  trans       & 0xff;
 455         cmd[4]  = (elem  >> 8) & 0xff;
 456         cmd[5]  =  elem        & 0xff;
 457         cmd[8]  = rotate ? 1 : 0;
 458         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 459 }
 460
 461 static int
 462 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 463 {
 464         u_char  cmd[12];
 465
 466         dprintk("move: 0x%x => 0x%x\n",src,dest);
 467         if (0 == trans)
 468                 trans = ch->firsts[CHET_MT];
 469         memset(cmd,0,sizeof(cmd));
 470         cmd[0]  = MOVE_MEDIUM;
 471         cmd[1]  = ch->device->lun << 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]  = (dest  >> 8) & 0xff;
 477         cmd[7]  =  dest        & 0xff;
 478         cmd[10] = rotate ? 1 : 0;
 479         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 480 }
 481
 482 static int
 483 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 484             u_int dest1, u_int dest2, int rotate1, int rotate2)
 485 {
 486         u_char  cmd[12];
 487
 488         dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
 489                 src,dest1,dest2);
 490         if (0 == trans)
 491                 trans = ch->firsts[CHET_MT];
 492         memset(cmd,0,sizeof(cmd));
 493         cmd[0]  = EXCHANGE_MEDIUM;
 494         cmd[1]  = ch->device->lun << 5;
 495         cmd[2]  = (trans >> 8) & 0xff;
 496         cmd[3]  =  trans       & 0xff;
 497         cmd[4]  = (src   >> 8) & 0xff;
 498         cmd[5]  =  src         & 0xff;
 499         cmd[6]  = (dest1 >> 8) & 0xff;
 500         cmd[7]  =  dest1       & 0xff;
 501         cmd[8]  = (dest2 >> 8) & 0xff;
 502         cmd[9]  =  dest2       & 0xff;
 503         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 504
 505         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 506 }
 507
 508 static void
 509 ch_check_voltag(char *tag)
 510 {
 511         int i;
 512
 513         for (i = 0; i < 32; i++) {
 514                 /* restrict to ascii */
 515                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 516                         tag[i] = ' ';
 517                 /* don't allow search wildcards */
 518                 if (tag[i] == '?' ||
 519                     tag[i] == '*')
 520                         tag[i] = ' ';
 521         }
 522 }
 523
 524 static int
 525 ch_set_voltag(scsi_changer *ch, u_int elem,
 526               int alternate, int clear, u_char *tag)
 527 {
 528         u_char  cmd[12];
 529         u_char  *buffer;
 530         int result;
 531
 532         buffer = kzalloc(512, GFP_KERNEL);
 533         if (!buffer)
 534                 return -ENOMEM;
 535
 536         dprintk("%s %s voltag: 0x%x => \"%s\"\n",
 537                 clear     ? "clear"     : "set",
 538                 alternate ? "alternate" : "primary",
 539                 elem, tag);
 540         memset(cmd,0,sizeof(cmd));
 541         cmd[0]  = SEND_VOLUME_TAG;
 542         cmd[1] = (ch->device->lun << 5) |
 543                 ch_elem_to_typecode(ch,elem);
 544         cmd[2] = (elem >> 8) & 0xff;
 545         cmd[3] = elem        & 0xff;
 546         cmd[5] = clear
 547                 ? (alternate ? 0x0d : 0x0c)
 548                 : (alternate ? 0x0b : 0x0a);
 549
 550         cmd[9] = 255;
 551
 552         memcpy(buffer,tag,32);
 553         ch_check_voltag(buffer);
 554
 555         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 556         kfree(buffer);
 557         return result;
 558 }
 559
 560 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 561 {
 562         int retval = 0;
 563         u_char data[16];
 564         unsigned int i;
 565
 566         mutex_lock(&ch->lock);
 567         for (i = 0; i < ch->counts[type]; i++) {
 568                 if (0 != ch_read_element_status
 569                     (ch, ch->firsts[type]+i,data)) {
 570                         retval = -EIO;
 571                         break;
 572                 }
 573                 put_user(data[2], dest+i);
 574                 if (data[2] & CESTATUS_EXCEPT)
 575                         vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
 576                                 ch->firsts[type]+i,
 577                                 (int)data[4],(int)data[5]);
 578                 retval = ch_read_element_status
 579                         (ch, ch->firsts[type]+i,data);
 580                 if (0 != retval)
 581                         break;
 582         }
 583         mutex_unlock(&ch->lock);
 584         return retval;
 585 }
 586
 587 /* ------------------------------------------------------------------------ */
 588
 589 static int
 590 ch_release(struct inode *inode, struct file *file)
 591 {
 592         scsi_changer *ch = file->private_data;
 593
 594         scsi_device_put(ch->device);
 595         file->private_data = NULL;
 596         return 0;
 597 }
 598
 599 static int
 600 ch_open(struct inode *inode, struct file *file)
 601 {
 602         scsi_changer *tmp, *ch;
 603         int minor = iminor(inode);
 604
 605         spin_lock(&ch_devlist_lock);
 606         ch = NULL;
 607         list_for_each_entry(tmp,&ch_devlist,list) {
 608                 if (tmp->minor == minor)
 609                         ch = tmp;
 610         }
 611         if (NULL == ch || scsi_device_get(ch->device)) {
 612                 spin_unlock(&ch_devlist_lock);
 613                 return -ENXIO;
 614         }
 615         spin_unlock(&ch_devlist_lock);
 616
 617         file->private_data = ch;
 618         return 0;
 619 }
 620
 621 static int
 622 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 623 {
 624         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 625                 return -1;
 626         return 0;
 627 }
 628
 629 static int ch_ioctl(struct inode * inode, struct file * file,
 630                     unsigned int cmd, unsigned long arg)
 631 {
 632         scsi_changer *ch = file->private_data;
 633         int retval;
 634         void __user *argp = (void __user *)arg;
 635
 636         switch (cmd) {
 637         case CHIOGPARAMS:
 638         {
 639                 struct changer_params params;
 640
 641                 params.cp_curpicker = 0;
 642                 params.cp_npickers  = ch->counts[CHET_MT];
 643                 params.cp_nslots    = ch->counts[CHET_ST];
 644                 params.cp_nportals  = ch->counts[CHET_IE];
 645                 params.cp_ndrives   = ch->counts[CHET_DT];
 646
 647                 if (copy_to_user(argp, &params, sizeof(params)))
 648                         return -EFAULT;
 649                 return 0;
 650         }
 651         case CHIOGVPARAMS:
 652         {
 653                 struct changer_vendor_params vparams;
 654
 655                 memset(&vparams,0,sizeof(vparams));
 656                 if (ch->counts[CHET_V1]) {
 657                         vparams.cvp_n1  = ch->counts[CHET_V1];
 658                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 659                 }
 660                 if (ch->counts[CHET_V2]) {
 661                         vparams.cvp_n2  = ch->counts[CHET_V2];
 662                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 663                 }
 664                 if (ch->counts[CHET_V3]) {
 665                         vparams.cvp_n3  = ch->counts[CHET_V3];
 666                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 667                 }
 668                 if (ch->counts[CHET_V4]) {
 669                         vparams.cvp_n4  = ch->counts[CHET_V4];
 670                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 671                 }
 672                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 673                         return -EFAULT;
 674                 return 0;
 675         }
 676
 677         case CHIOPOSITION:
 678         {
 679                 struct changer_position pos;
 680
 681                 if (copy_from_user(&pos, argp, sizeof (pos)))
 682                         return -EFAULT;
 683
 684                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 685                         dprintk("CHIOPOSITION: invalid parameter\n");
 686                         return -EBADSLT;
 687                 }
 688                 mutex_lock(&ch->lock);
 689                 retval = ch_position(ch,0,
 690                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 691                                      pos.cp_flags & CP_INVERT);
 692                 mutex_unlock(&ch->lock);
 693                 return retval;
 694         }
 695
 696         case CHIOMOVE:
 697         {
 698                 struct changer_move mv;
 699
 700                 if (copy_from_user(&mv, argp, sizeof (mv)))
 701                         return -EFAULT;
 702
 703                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 704                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 705                         dprintk("CHIOMOVE: invalid parameter\n");
 706                         return -EBADSLT;
 707                 }
 708
 709                 mutex_lock(&ch->lock);
 710                 retval = ch_move(ch,0,
 711                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 712                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 713                                  mv.cm_flags & CM_INVERT);
 714                 mutex_unlock(&ch->lock);
 715                 return retval;
 716         }
 717
 718         case CHIOEXCHANGE:
 719         {
 720                 struct changer_exchange mv;
 721
 722                 if (copy_from_user(&mv, argp, sizeof (mv)))
 723                         return -EFAULT;
 724
 725                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 726                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 727                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 728                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 729                         return -EBADSLT;
 730                 }
 731
 732                 mutex_lock(&ch->lock);
 733                 retval = ch_exchange
 734                         (ch,0,
 735                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 736                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 737                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 738                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 739                 mutex_unlock(&ch->lock);
 740                 return retval;
 741         }
 742
 743         case CHIOGSTATUS:
 744         {
 745                 struct changer_element_status ces;
 746
 747                 if (copy_from_user(&ces, argp, sizeof (ces)))
 748                         return -EFAULT;
 749                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 750                         return -EINVAL;
 751
 752                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 753         }
 754
 755         case CHIOGELEM:
 756         {
 757                 struct changer_get_element cge;
 758                 u_char  cmd[12];
 759                 u_char  *buffer;
 760                 unsigned int elem;
 761                 int     result,i;
 762
 763                 if (copy_from_user(&cge, argp, sizeof (cge)))
 764                         return -EFAULT;
 765
 766                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 767                         return -EINVAL;
 768                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 769
 770                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 771                 if (!buffer)
 772                         return -ENOMEM;
 773                 mutex_lock(&ch->lock);
 774
 775         voltag_retry:
 776                 memset(cmd,0,sizeof(cmd));
 777                 cmd[0] = READ_ELEMENT_STATUS;
 778                 cmd[1] = (ch->device->lun << 5) |
 779                         (ch->voltags ? 0x10 : 0) |
 780                         ch_elem_to_typecode(ch,elem);
 781                 cmd[2] = (elem >> 8) & 0xff;
 782                 cmd[3] = elem        & 0xff;
 783                 cmd[5] = 1;
 784                 cmd[9] = 255;
 785
 786                 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 787                         cge.cge_status = buffer[18];
 788                         cge.cge_flags = 0;
 789                         if (buffer[18] & CESTATUS_EXCEPT) {
 790                                 cge.cge_errno = EIO;
 791                         }
 792                         if (buffer[25] & 0x80) {
 793                                 cge.cge_flags |= CGE_SRC;
 794                                 if (buffer[25] & 0x40)
 795                                         cge.cge_flags |= CGE_INVERT;
 796                                 elem = (buffer[26]<<8) | buffer[27];
 797                                 for (i = 0; i < 4; i++) {
 798                                         if (elem >= ch->firsts[i] &&
 799                                             elem <  ch->firsts[i] + ch->counts[i]) {
 800                                                 cge.cge_srctype = i;
 801                                                 cge.cge_srcunit = elem-ch->firsts[i];
 802                                         }
 803                                 }
 804                         }
 805                         if ((buffer[22] & 0x30) == 0x30) {
 806                                 cge.cge_flags |= CGE_IDLUN;
 807                                 cge.cge_id  = buffer[23];
 808                                 cge.cge_lun = buffer[22] & 7;
 809                         }
 810                         if (buffer[9] & 0x80) {
 811                                 cge.cge_flags |= CGE_PVOLTAG;
 812                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 813                         }
 814                         if (buffer[9] & 0x40) {
 815                                 cge.cge_flags |= CGE_AVOLTAG;
 816                                 memcpy(cge.cge_avoltag,buffer+64,36);
 817                         }
 818                 } else if (ch->voltags) {
 819                         ch->voltags = 0;
 820                         vprintk("device has no volume tag support\n");
 821                         goto voltag_retry;
 822                 }
 823                 kfree(buffer);
 824                 mutex_unlock(&ch->lock);
 825
 826                 if (copy_to_user(argp, &cge, sizeof (cge)))
 827                         return -EFAULT;
 828                 return result;
 829         }
 830
 831         case CHIOINITELEM:
 832         {
 833                 mutex_lock(&ch->lock);
 834                 retval = ch_init_elem(ch);
 835                 mutex_unlock(&ch->lock);
 836                 return retval;
 837         }
 838
 839         case CHIOSVOLTAG:
 840         {
 841                 struct changer_set_voltag csv;
 842                 int elem;
 843
 844                 if (copy_from_user(&csv, argp, sizeof(csv)))
 845                         return -EFAULT;
 846
 847                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 848                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 849                         return -EBADSLT;
 850                 }
 851                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 852                 mutex_lock(&ch->lock);
 853                 retval = ch_set_voltag(ch, elem,
 854                                        csv.csv_flags & CSV_AVOLTAG,
 855                                        csv.csv_flags & CSV_CLEARTAG,
 856                                        csv.csv_voltag);
 857                 mutex_unlock(&ch->lock);
 858                 return retval;
 859         }
 860
 861         default:
 862                 return scsi_ioctl(ch->device, cmd, argp);
 863
 864         }
 865 }
 866
 867 #ifdef CONFIG_COMPAT
 868
 869 struct changer_element_status32 {
 870         int             ces_type;
 871         compat_uptr_t   ces_data;
 872 };
 873 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 874
 875 static long ch_ioctl_compat(struct file * file,
 876                             unsigned int cmd, unsigned long arg)
 877 {
 878         scsi_changer *ch = file->private_data;
 879
 880         switch (cmd) {
 881         case CHIOGPARAMS:
 882         case CHIOGVPARAMS:
 883         case CHIOPOSITION:
 884         case CHIOMOVE:
 885         case CHIOEXCHANGE:
 886         case CHIOGELEM:
 887         case CHIOINITELEM:
 888         case CHIOSVOLTAG:
 889                 /* compatible */
 890                 return ch_ioctl(NULL /* inode, unused */,
 891                                 file, cmd, arg);
 892         case CHIOGSTATUS32:
 893         {
 894                 struct changer_element_status32 ces32;
 895                 unsigned char __user *data;
 896
 897                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 898                         return -EFAULT;
 899                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 900                         return -EINVAL;
 901
 902                 data = compat_ptr(ces32.ces_data);
 903                 return ch_gstatus(ch, ces32.ces_type, data);
 904         }
 905         default:
 906                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 907                 return -ENOIOCTLCMD;
 908
 909         }
 910 }
 911 #endif
 912
 913 /* ------------------------------------------------------------------------ */
 914
 915 static int ch_probe(struct device *dev)
 916 {
 917         struct scsi_device *sd = to_scsi_device(dev);
 918         scsi_changer *ch;
 919
 920         if (sd->type != TYPE_MEDIUM_CHANGER)
 921                 return -ENODEV;
 922
 923         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 924         if (NULL == ch)
 925                 return -ENOMEM;
 926
 927         ch->minor = ch_devcount;
 928         sprintf(ch->name,"ch%d",ch->minor);
 929         mutex_init(&ch->lock);
 930         ch->device = sd;
 931         ch_readconfig(ch);
 932         if (init)
 933                 ch_init_elem(ch);
 934
 935         class_device_create(ch_sysfs_class, NULL,
 936                             MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
 937                             dev, "s%s", ch->name);
 938
 939         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 940
 941         spin_lock(&ch_devlist_lock);
 942         list_add_tail(&ch->list,&ch_devlist);
 943         ch_devcount++;
 944         spin_unlock(&ch_devlist_lock);
 945         return 0;
 946 }
 947
 948 static int ch_remove(struct device *dev)
 949 {
 950         struct scsi_device *sd = to_scsi_device(dev);
 951         scsi_changer *tmp, *ch;
 952
 953         spin_lock(&ch_devlist_lock);
 954         ch = NULL;
 955         list_for_each_entry(tmp,&ch_devlist,list) {
 956                 if (tmp->device == sd)
 957                         ch = tmp;
 958         }
 959         BUG_ON(NULL == ch);
 960         list_del(&ch->list);
 961         spin_unlock(&ch_devlist_lock);
 962
 963         class_device_destroy(ch_sysfs_class,
 964                              MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 965         kfree(ch->dt);
 966         kfree(ch);
 967         ch_devcount--;
 968         return 0;
 969 }
 970
 971 static int __init init_ch_module(void)
 972 {
 973         int rc;
 974
 975         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 976         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 977         if (IS_ERR(ch_sysfs_class)) {
 978                 rc = PTR_ERR(ch_sysfs_class);
 979                 return rc;
 980         }
 981         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 982         if (rc < 0) {
 983                 printk("Unable to get major %d for SCSI-Changer\n",
 984                        SCSI_CHANGER_MAJOR);
 985                 goto fail1;
 986         }
 987         rc = scsi_register_driver(&ch_template.gendrv);
 988         if (rc < 0)
 989                 goto fail2;
 990         return 0;
 991
 992  fail2:
 993         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
 994  fail1:
 995         class_destroy(ch_sysfs_class);
 996         return rc;
 997 }
 998
 999 static void __exit exit_ch_module(void)
1000 {
1001         scsi_unregister_driver(&ch_template.gendrv);
1002         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1003         class_destroy(ch_sysfs_class);
1004 }
1005
1006 module_init(init_ch_module);
1007 module_exit(exit_ch_module);
1008
1009 /*
1010  * Local variables:
1011  * c-basic-offset: 8
1012  * End:
1013  */