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/ioctl32.h>
  24 #include <linux/compat.h>
  25 #include <linux/chio.h>                 /* here are all the ioctls */
  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_request.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 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 semaphore    lock;
 116 } scsi_changer;
 117
 118 static LIST_HEAD(ch_devlist);
 119 static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED;
 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 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(unsigned char *sense_buffer)
 184 {
 185         int i,errno = 0;
 186
 187         /* Check to see if additional sense information is available */
 188         if (sense_buffer[7]  > 5 &&
 189             sense_buffer[12] != 0) {
 190                 for (i = 0; err[i].errno != 0; i++) {
 191                         if (err[i].sense == sense_buffer[ 2] &&
 192                             err[i].asc   == sense_buffer[12] &&
 193                             err[i].ascq  == sense_buffer[13]) {
 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;
 210         struct scsi_request *sr;
 211
 212         sr = scsi_allocate_request(ch->device, GFP_KERNEL);
 213         if (NULL == sr)
 214                 return -ENOMEM;
 215
 216         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 217                 ? timeout_init : timeout_move;
 218
 219  retry:
 220         errno = 0;
 221         if (debug) {
 222                 dprintk("command: ");
 223                 __scsi_print_command(cmd);
 224         }
 225
 226         scsi_wait_req(sr, cmd, buffer, buflength,
 227                       timeout * HZ, MAX_RETRIES);
 228
 229         dprintk("result: 0x%x\n",sr->sr_result);
 230         if (driver_byte(sr->sr_result) & DRIVER_SENSE) {
 231                 if (debug)
 232                         scsi_print_req_sense(ch->name, sr);
 233                 errno = ch_find_errno(sr->sr_sense_buffer);
 234
 235                 switch(sr->sr_sense_buffer[2] & 0xf) {
 236                 case UNIT_ATTENTION:
 237                         ch->unit_attention = 1;
 238                         if (retries++ < 3)
 239                                 goto retry;
 240                         break;
 241                 }
 242         }
 243         scsi_release_request(sr);
 244         return errno;
 245 }
 246
 247 /* ------------------------------------------------------------------------ */
 248
 249 static int
 250 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 251 {
 252         int i;
 253
 254         for (i = 0; i < CH_TYPES; i++) {
 255                 if (elem >= ch->firsts[i]  &&
 256                     elem <  ch->firsts[i] +
 257                     ch->counts[i])
 258                         return i+1;
 259         }
 260         return 0;
 261 }
 262
 263 static int
 264 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 265 {
 266         u_char  cmd[12];
 267         u_char  *buffer;
 268         int     result;
 269
 270         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 271         if(!buffer)
 272                 return -ENOMEM;
 273
 274  retry:
 275         memset(cmd,0,sizeof(cmd));
 276         cmd[0] = READ_ELEMENT_STATUS;
 277         cmd[1] = (ch->device->lun << 5) |
 278                 (ch->voltags ? 0x10 : 0) |
 279                 ch_elem_to_typecode(ch,elem);
 280         cmd[2] = (elem >> 8) & 0xff;
 281         cmd[3] = elem        & 0xff;
 282         cmd[5] = 1;
 283         cmd[9] = 255;
 284         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 285                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 286                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 287                                 elem,(buffer[16] << 8) | buffer[17]);
 288                         kfree(buffer);
 289                         return -EIO;
 290                 }
 291                 memcpy(data,buffer+16,16);
 292         } else {
 293                 if (ch->voltags) {
 294                         ch->voltags = 0;
 295                         vprintk("device has no volume tag support\n");
 296                         goto retry;
 297                 }
 298                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 299         }
 300         kfree(buffer);
 301         return result;
 302 }
 303
 304 static int
 305 ch_init_elem(scsi_changer *ch)
 306 {
 307         int err;
 308         u_char cmd[6];
 309
 310         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 311         memset(cmd,0,sizeof(cmd));
 312         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 313         cmd[1] = ch->device->lun << 5;
 314         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 315         vprintk("... finished\n");
 316         return err;
 317 }
 318
 319 static int
 320 ch_readconfig(scsi_changer *ch)
 321 {
 322         u_char  cmd[10], data[16];
 323         u_char  *buffer;
 324         int     result,id,lun,i;
 325         u_int   elem;
 326
 327         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 328         if (!buffer)
 329                 return -ENOMEM;
 330         memset(buffer,0,512);
 331
 332         memset(cmd,0,sizeof(cmd));
 333         cmd[0] = MODE_SENSE;
 334         cmd[1] = ch->device->lun << 5;
 335         cmd[2] = 0x1d;
 336         cmd[4] = 255;
 337         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 338         if (0 != result) {
 339                 cmd[1] |= (1<<3);
 340                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 341         }
 342         if (0 == result) {
 343                 ch->firsts[CHET_MT] =
 344                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 345                 ch->counts[CHET_MT] =
 346                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 347                 ch->firsts[CHET_ST] =
 348                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 349                 ch->counts[CHET_ST] =
 350                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 351                 ch->firsts[CHET_IE] =
 352                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 353                 ch->counts[CHET_IE] =
 354                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 355                 ch->firsts[CHET_DT] =
 356                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 357                 ch->counts[CHET_DT] =
 358                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 359                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 360                         ch->firsts[CHET_MT],
 361                         ch->counts[CHET_MT]);
 362                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 363                         ch->firsts[CHET_ST],
 364                         ch->counts[CHET_ST]);
 365                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 366                         ch->firsts[CHET_IE],
 367                         ch->counts[CHET_IE]);
 368                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 369                         ch->firsts[CHET_DT],
 370                         ch->counts[CHET_DT]);
 371         } else {
 372                 vprintk("reading element address assigment page failed!\n");
 373         }
 374
 375         /* vendor specific element types */
 376         for (i = 0; i < 4; i++) {
 377                 if (0 == vendor_counts[i])
 378                         continue;
 379                 if (NULL == vendor_labels[i])
 380                         continue;
 381                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 382                 ch->counts[CHET_V1+i] = vendor_counts[i];
 383                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 384                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 385                         vendor_labels[i]);
 386         }
 387
 388         /* look up the devices of the data transfer elements */
 389         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 390                          GFP_KERNEL);
 391         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 392                 id  = -1;
 393                 lun = 0;
 394                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 395                         id  = dt_id[elem];
 396                         lun = dt_lun[elem];
 397                         vprintk("dt 0x%x: [insmod option] ",
 398                                 elem+ch->firsts[CHET_DT]);
 399                 } else if (0 != ch_read_element_status
 400                            (ch,elem+ch->firsts[CHET_DT],data)) {
 401                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 402                                 elem+ch->firsts[CHET_DT]);
 403                 } else {
 404                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 405                         if (data[6] & 0x80) {
 406                                 if (verbose)
 407                                         printk("not this SCSI bus\n");
 408                                 ch->dt[elem] = NULL;
 409                         } else if (0 == (data[6] & 0x30)) {
 410                                 if (verbose)
 411                                         printk("ID/LUN unknown\n");
 412                                 ch->dt[elem] = NULL;
 413                         } else {
 414                                 id  = ch->device->id;
 415                                 lun = 0;
 416                                 if (data[6] & 0x20) id  = data[7];
 417                                 if (data[6] & 0x10) lun = data[6] & 7;
 418                         }
 419                 }
 420                 if (-1 != id) {
 421                         if (verbose)
 422                                 printk("ID %i, LUN %i, ",id,lun);
 423                         ch->dt[elem] =
 424                                 scsi_device_lookup(ch->device->host,
 425                                                    ch->device->channel,
 426                                                    id,lun);
 427                         if (!ch->dt[elem]) {
 428                                 /* should not happen */
 429                                 if (verbose)
 430                                         printk("Huh? device not found!\n");
 431                         } else {
 432                                 if (verbose)
 433                                         printk("name: %8.8s %16.16s %4.4s\n",
 434                                                ch->dt[elem]->vendor,
 435                                                ch->dt[elem]->model,
 436                                                ch->dt[elem]->rev);
 437                         }
 438                 }
 439         }
 440         ch->voltags = 1;
 441         kfree(buffer);
 442
 443         return 0;
 444 }
 445
 446 /* ------------------------------------------------------------------------ */
 447
 448 static int
 449 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 450 {
 451         u_char  cmd[10];
 452
 453         dprintk("position: 0x%x\n",elem);
 454         if (0 == trans)
 455                 trans = ch->firsts[CHET_MT];
 456         memset(cmd,0,sizeof(cmd));
 457         cmd[0]  = POSITION_TO_ELEMENT;
 458         cmd[1]  = ch->device->lun << 5;
 459         cmd[2]  = (trans >> 8) & 0xff;
 460         cmd[3]  =  trans       & 0xff;
 461         cmd[4]  = (elem  >> 8) & 0xff;
 462         cmd[5]  =  elem        & 0xff;
 463         cmd[8]  = rotate ? 1 : 0;
 464         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 465 }
 466
 467 static int
 468 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 469 {
 470         u_char  cmd[12];
 471
 472         dprintk("move: 0x%x => 0x%x\n",src,dest);
 473         if (0 == trans)
 474                 trans = ch->firsts[CHET_MT];
 475         memset(cmd,0,sizeof(cmd));
 476         cmd[0]  = MOVE_MEDIUM;
 477         cmd[1]  = ch->device->lun << 5;
 478         cmd[2]  = (trans >> 8) & 0xff;
 479         cmd[3]  =  trans       & 0xff;
 480         cmd[4]  = (src   >> 8) & 0xff;
 481         cmd[5]  =  src         & 0xff;
 482         cmd[6]  = (dest  >> 8) & 0xff;
 483         cmd[7]  =  dest        & 0xff;
 484         cmd[10] = rotate ? 1 : 0;
 485         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 486 }
 487
 488 static int
 489 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 490             u_int dest1, u_int dest2, int rotate1, int rotate2)
 491 {
 492         u_char  cmd[12];
 493
 494         dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
 495                 src,dest1,dest2);
 496         if (0 == trans)
 497                 trans = ch->firsts[CHET_MT];
 498         memset(cmd,0,sizeof(cmd));
 499         cmd[0]  = EXCHANGE_MEDIUM;
 500         cmd[1]  = ch->device->lun << 5;
 501         cmd[2]  = (trans >> 8) & 0xff;
 502         cmd[3]  =  trans       & 0xff;
 503         cmd[4]  = (src   >> 8) & 0xff;
 504         cmd[5]  =  src         & 0xff;
 505         cmd[6]  = (dest1 >> 8) & 0xff;
 506         cmd[7]  =  dest1       & 0xff;
 507         cmd[8]  = (dest2 >> 8) & 0xff;
 508         cmd[9]  =  dest2       & 0xff;
 509         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 510
 511         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 512 }
 513
 514 static void
 515 ch_check_voltag(char *tag)
 516 {
 517         int i;
 518
 519         for (i = 0; i < 32; i++) {
 520                 /* restrict to ascii */
 521                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 522                         tag[i] = ' ';
 523                 /* don't allow search wildcards */
 524                 if (tag[i] == '?' ||
 525                     tag[i] == '*')
 526                         tag[i] = ' ';
 527         }
 528 }
 529
 530 static int
 531 ch_set_voltag(scsi_changer *ch, u_int elem,
 532               int alternate, int clear, u_char *tag)
 533 {
 534         u_char  cmd[12];
 535         u_char  *buffer;
 536         int result;
 537
 538         buffer = kmalloc(512, GFP_KERNEL);
 539         if (!buffer)
 540                 return -ENOMEM;
 541         memset(buffer,0,512);
 542
 543         dprintk("%s %s voltag: 0x%x => \"%s\"\n",
 544                 clear     ? "clear"     : "set",
 545                 alternate ? "alternate" : "primary",
 546                 elem, tag);
 547         memset(cmd,0,sizeof(cmd));
 548         cmd[0]  = SEND_VOLUME_TAG;
 549         cmd[1] = (ch->device->lun << 5) |
 550                 ch_elem_to_typecode(ch,elem);
 551         cmd[2] = (elem >> 8) & 0xff;
 552         cmd[3] = elem        & 0xff;
 553         cmd[5] = clear
 554                 ? (alternate ? 0x0d : 0x0c)
 555                 : (alternate ? 0x0b : 0x0a);
 556
 557         cmd[9] = 255;
 558
 559         memcpy(buffer,tag,32);
 560         ch_check_voltag(buffer);
 561
 562         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 563         kfree(buffer);
 564         return result;
 565 }
 566
 567 static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest)
 568 {
 569         int retval = 0;
 570         u_char data[16];
 571         unsigned int i;
 572
 573         down(&ch->lock);
 574         for (i = 0; i < ch->counts[type]; i++) {
 575                 if (0 != ch_read_element_status
 576                     (ch, ch->firsts[type]+i,data)) {
 577                         retval = -EIO;
 578                         break;
 579                 }
 580                 put_user(data[2], dest+i);
 581                 if (data[2] & CESTATUS_EXCEPT)
 582                         vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
 583                                 ch->firsts[type]+i,
 584                                 (int)data[4],(int)data[5]);
 585                 retval = ch_read_element_status
 586                         (ch, ch->firsts[type]+i,data);
 587                 if (0 != retval)
 588                         break;
 589         }
 590         up(&ch->lock);
 591         return retval;
 592 }
 593
 594 /* ------------------------------------------------------------------------ */
 595
 596 static int
 597 ch_release(struct inode *inode, struct file *file)
 598 {
 599         scsi_changer *ch = file->private_data;
 600
 601         scsi_device_put(ch->device);
 602         file->private_data = NULL;
 603         return 0;
 604 }
 605
 606 static int
 607 ch_open(struct inode *inode, struct file *file)
 608 {
 609         scsi_changer *tmp, *ch;
 610         int minor = iminor(inode);
 611
 612         spin_lock(&ch_devlist_lock);
 613         ch = NULL;
 614         list_for_each_entry(tmp,&ch_devlist,list) {
 615                 if (tmp->minor == minor)
 616                         ch = tmp;
 617         }
 618         if (NULL == ch || scsi_device_get(ch->device)) {
 619                 spin_unlock(&ch_devlist_lock);
 620                 return -ENXIO;
 621         }
 622         spin_unlock(&ch_devlist_lock);
 623
 624         file->private_data = ch;
 625         return 0;
 626 }
 627
 628 static int
 629 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 630 {
 631         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 632                 return -1;
 633         return 0;
 634 }
 635
 636 static int ch_ioctl(struct inode * inode, struct file * file,
 637                     unsigned int cmd, unsigned long arg)
 638 {
 639         scsi_changer *ch = file->private_data;
 640         int retval;
 641
 642         switch (cmd) {
 643         case CHIOGPARAMS:
 644         {
 645                 struct changer_params params;
 646
 647                 params.cp_curpicker = 0;
 648                 params.cp_npickers  = ch->counts[CHET_MT];
 649                 params.cp_nslots    = ch->counts[CHET_ST];
 650                 params.cp_nportals  = ch->counts[CHET_IE];
 651                 params.cp_ndrives   = ch->counts[CHET_DT];
 652
 653                 if (copy_to_user((void *) arg, &params, sizeof(params)))
 654                         return -EFAULT;
 655                 return 0;
 656         }
 657         case CHIOGVPARAMS:
 658         {
 659                 struct changer_vendor_params vparams;
 660
 661                 memset(&vparams,0,sizeof(vparams));
 662                 if (ch->counts[CHET_V1]) {
 663                         vparams.cvp_n1  = ch->counts[CHET_V1];
 664                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 665                 }
 666                 if (ch->counts[CHET_V2]) {
 667                         vparams.cvp_n2  = ch->counts[CHET_V2];
 668                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 669                 }
 670                 if (ch->counts[CHET_V3]) {
 671                         vparams.cvp_n3  = ch->counts[CHET_V3];
 672                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 673                 }
 674                 if (ch->counts[CHET_V4]) {
 675                         vparams.cvp_n4  = ch->counts[CHET_V4];
 676                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 677                 }
 678                 if (copy_to_user((void *) arg, &vparams, sizeof(vparams)))
 679                         return -EFAULT;
 680                 return 0;
 681         }
 682
 683         case CHIOPOSITION:
 684         {
 685                 struct changer_position pos;
 686
 687                 if (copy_from_user(&pos, (void*)arg, sizeof (pos)))
 688                         return -EFAULT;
 689
 690                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 691                         dprintk("CHIOPOSITION: invalid parameter\n");
 692                         return -EBADSLT;
 693                 }
 694                 down(&ch->lock);
 695                 retval = ch_position(ch,0,
 696                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 697                                      pos.cp_flags & CP_INVERT);
 698                 up(&ch->lock);
 699                 return retval;
 700         }
 701
 702         case CHIOMOVE:
 703         {
 704                 struct changer_move mv;
 705
 706                 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
 707                         return -EFAULT;
 708
 709                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 710                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 711                         dprintk("CHIOMOVE: invalid parameter\n");
 712                         return -EBADSLT;
 713                 }
 714
 715                 down(&ch->lock);
 716                 retval = ch_move(ch,0,
 717                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 718                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 719                                  mv.cm_flags & CM_INVERT);
 720                 up(&ch->lock);
 721                 return retval;
 722         }
 723
 724         case CHIOEXCHANGE:
 725         {
 726                 struct changer_exchange mv;
 727
 728                 if (copy_from_user(&mv, (void*)arg, sizeof (mv)))
 729                         return -EFAULT;
 730
 731                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 732                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 733                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 734                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 735                         return -EBADSLT;
 736                 }
 737
 738                 down(&ch->lock);
 739                 retval = ch_exchange
 740                         (ch,0,
 741                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 742                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 743                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 744                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 745                 up(&ch->lock);
 746                 return retval;
 747         }
 748
 749         case CHIOGSTATUS:
 750         {
 751                 struct changer_element_status ces;
 752
 753                 if (copy_from_user(&ces, (void*)arg, sizeof (ces)))
 754                         return -EFAULT;
 755                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 756                         return -EINVAL;
 757
 758                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 759         }
 760
 761         case CHIOGELEM:
 762         {
 763                 struct changer_get_element cge;
 764                 u_char  cmd[12];
 765                 u_char  *buffer;
 766                 unsigned int elem;
 767                 int     result,i;
 768
 769                 if (copy_from_user(&cge, (void*)arg, sizeof (cge)))
 770                         return -EFAULT;
 771
 772                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 773                         return -EINVAL;
 774                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 775
 776                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 777                 if (!buffer)
 778                         return -ENOMEM;
 779                 down(&ch->lock);
 780
 781         voltag_retry:
 782                 memset(cmd,0,sizeof(cmd));
 783                 cmd[0] = READ_ELEMENT_STATUS;
 784                 cmd[1] = (ch->device->lun << 5) |
 785                         (ch->voltags ? 0x10 : 0) |
 786                         ch_elem_to_typecode(ch,elem);
 787                 cmd[2] = (elem >> 8) & 0xff;
 788                 cmd[3] = elem        & 0xff;
 789                 cmd[5] = 1;
 790                 cmd[9] = 255;
 791
 792                 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 793                         cge.cge_status = buffer[18];
 794                         cge.cge_flags = 0;
 795                         if (buffer[18] & CESTATUS_EXCEPT) {
 796                                 cge.cge_errno = EIO;
 797                         }
 798                         if (buffer[25] & 0x80) {
 799                                 cge.cge_flags |= CGE_SRC;
 800                                 if (buffer[25] & 0x40)
 801                                         cge.cge_flags |= CGE_INVERT;
 802                                 elem = (buffer[26]<<8) | buffer[27];
 803                                 for (i = 0; i < 4; i++) {
 804                                         if (elem >= ch->firsts[i] &&
 805                                             elem <  ch->firsts[i] + ch->counts[i]) {
 806                                                 cge.cge_srctype = i;
 807                                                 cge.cge_srcunit = elem-ch->firsts[i];
 808                                         }
 809                                 }
 810                         }
 811                         if ((buffer[22] & 0x30) == 0x30) {
 812                                 cge.cge_flags |= CGE_IDLUN;
 813                                 cge.cge_id  = buffer[23];
 814                                 cge.cge_lun = buffer[22] & 7;
 815                         }
 816                         if (buffer[9] & 0x80) {
 817                                 cge.cge_flags |= CGE_PVOLTAG;
 818                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 819                         }
 820                         if (buffer[9] & 0x40) {
 821                                 cge.cge_flags |= CGE_AVOLTAG;
 822                                 memcpy(cge.cge_avoltag,buffer+64,36);
 823                         }
 824                 } else if (ch->voltags) {
 825                         ch->voltags = 0;
 826                         vprintk("device has no volume tag support\n");
 827                         goto voltag_retry;
 828                 }
 829                 kfree(buffer);
 830                 up(&ch->lock);
 831
 832                 if (copy_to_user((void*)arg, &cge, sizeof (cge)))
 833                         return -EFAULT;
 834                 return result;
 835         }
 836
 837         case CHIOINITELEM:
 838         {
 839                 down(&ch->lock);
 840                 retval = ch_init_elem(ch);
 841                 up(&ch->lock);
 842                 return retval;
 843         }
 844
 845         case CHIOSVOLTAG:
 846         {
 847                 struct changer_set_voltag csv;
 848                 int elem;
 849
 850                 if (copy_from_user(&csv, (void*)arg, sizeof(csv)))
 851                         return -EFAULT;
 852
 853                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 854                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 855                         return -EBADSLT;
 856                 }
 857                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 858                 down(&ch->lock);
 859                 retval = ch_set_voltag(ch, elem,
 860                                        csv.csv_flags & CSV_AVOLTAG,
 861                                        csv.csv_flags & CSV_CLEARTAG,
 862                                        csv.csv_voltag);
 863                 up(&ch->lock);
 864                 return retval;
 865         }
 866
 867         default:
 868                 return scsi_ioctl(ch->device, cmd, (void*)arg);
 869
 870         }
 871 }
 872
 873 #ifdef CONFIG_COMPAT
 874
 875 struct changer_element_status32 {
 876         int             ces_type;
 877         compat_uptr_t   ces_data;
 878 };
 879 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 880
 881 static long ch_ioctl_compat(struct file * file,
 882                             unsigned int cmd, unsigned long arg)
 883 {
 884         scsi_changer *ch = file->private_data;
 885
 886         switch (cmd) {
 887         case CHIOGPARAMS:
 888         case CHIOGVPARAMS:
 889         case CHIOPOSITION:
 890         case CHIOMOVE:
 891         case CHIOEXCHANGE:
 892         case CHIOGELEM:
 893         case CHIOINITELEM:
 894         case CHIOSVOLTAG:
 895                 /* compatible */
 896                 return ch_ioctl(NULL /* inode, unused */,
 897                                 file, cmd, arg);
 898         case CHIOGSTATUS32:
 899         {
 900                 struct changer_element_status32 ces32;
 901                 unsigned char *data;
 902
 903                 if (copy_from_user(&ces32, (void*)arg, sizeof (ces32)))
 904                         return -EFAULT;
 905                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 906                         return -EINVAL;
 907
 908                 data = compat_ptr(ces32.ces_data);
 909                 return ch_gstatus(ch, ces32.ces_type, data);
 910         }
 911         default:
 912                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 913                 return -ENOIOCTLCMD;
 914
 915         }
 916 }
 917 #endif
 918
 919 /* ------------------------------------------------------------------------ */
 920
 921 static int ch_probe(struct device *dev)
 922 {
 923         struct scsi_device *sd = to_scsi_device(dev);
 924         scsi_changer *ch;
 925
 926         if (sd->type != TYPE_MEDIUM_CHANGER)
 927                 return -ENODEV;
 928
 929         ch = kmalloc(sizeof(*ch), GFP_KERNEL);
 930         if (NULL == ch)
 931                 return -ENOMEM;
 932
 933         memset(ch,0,sizeof(*ch));
 934         ch->minor = ch_devcount;
 935         sprintf(ch->name,"ch%d",ch->minor);
 936         init_MUTEX(&ch->lock);
 937         ch->device = sd;
 938         ch_readconfig(ch);
 939         if (init)
 940                 ch_init_elem(ch);
 941
 942         class_device_create(ch_sysfs_class,
 943                             MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
 944                             dev, "s%s", ch->name);
 945
 946         printk(KERN_INFO "Attached scsi changer %s "
 947                "at scsi%d, channel %d, id %d, lun %d\n",
 948                ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun);
 949
 950         spin_lock(&ch_devlist_lock);
 951         list_add_tail(&ch->list,&ch_devlist);
 952         ch_devcount++;
 953         spin_unlock(&ch_devlist_lock);
 954         return 0;
 955 }
 956
 957 static int ch_remove(struct device *dev)
 958 {
 959         struct scsi_device *sd = to_scsi_device(dev);
 960         scsi_changer *tmp, *ch;
 961
 962         spin_lock(&ch_devlist_lock);
 963         ch = NULL;
 964         list_for_each_entry(tmp,&ch_devlist,list) {
 965                 if (tmp->device == sd)
 966                         ch = tmp;
 967         }
 968         BUG_ON(NULL == ch);
 969         list_del(&ch->list);
 970         spin_unlock(&ch_devlist_lock);
 971
 972         class_device_destroy(ch_sysfs_class,
 973                              MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 974         kfree(ch->dt);
 975         kfree(ch);
 976         ch_devcount--;
 977         return 0;
 978 }
 979
 980 static int __init init_ch_module(void)
 981 {
 982         int rc;
 983
 984         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 985         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 986         if (IS_ERR(ch_sysfs_class)) {
 987                 rc = PTR_ERR(ch_sysfs_class);
 988                 return rc;
 989         }
 990         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 991         if (rc < 0) {
 992                 printk("Unable to get major %d for SCSI-Changer\n",
 993                        SCSI_CHANGER_MAJOR);
 994                 goto fail1;
 995         }
 996         rc = scsi_register_driver(&ch_template.gendrv);
 997         if (rc < 0)
 998                 goto fail2;
 999         return 0;
1000
1001  fail2:
1002         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1003  fail1:
1004         class_destroy(ch_sysfs_class);
1005         return rc;
1006 }
1007
1008 static void __exit exit_ch_module(void)
1009 {
1010         scsi_unregister_driver(&ch_template.gendrv);
1011         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1012         class_destroy(ch_sysfs_class);
1013 }
1014
1015 module_init(init_ch_module);
1016 module_exit(exit_ch_module);
1017
1018 /*
1019  * Local variables:
1020  * c-basic-offset: 8
1021  * End:
1022  */