err.no Git - linux-2.6/blob - drivers/scsi/ch.c

   1 /*
   2  * SCSI Media Changer device driver for Linux 2.6
   3  *
   4  *     (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
   5  *
   6  */
   7
   8 #define VERSION "0.25"
   9
  10 #include <linux/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 long ch_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
  96 #ifdef CONFIG_COMPAT
  97 static long ch_ioctl_compat(struct file * filp,
  98                             unsigned int cmd, unsigned long arg);
  99 #endif
 100
 101 static struct class * ch_sysfs_class;
 102
 103 typedef struct {
 104         struct list_head    list;
 105         int                 minor;
 106         char                name[8];
 107         struct scsi_device  *device;
 108         struct scsi_device  **dt;        /* ptrs to data transfer elements */
 109         u_int               firsts[CH_TYPES];
 110         u_int               counts[CH_TYPES];
 111         u_int               unit_attention;
 112         u_int               voltags;
 113         struct mutex        lock;
 114 } scsi_changer;
 115
 116 static LIST_HEAD(ch_devlist);
 117 static DEFINE_SPINLOCK(ch_devlist_lock);
 118 static int ch_devcount;
 119
 120 static struct scsi_driver ch_template =
 121 {
 122         .owner          = THIS_MODULE,
 123         .gendrv         = {
 124                 .name   = "ch",
 125                 .probe  = ch_probe,
 126                 .remove = ch_remove,
 127         },
 128 };
 129
 130 static const struct file_operations changer_fops =
 131 {
 132         .owner          = THIS_MODULE,
 133         .open           = ch_open,
 134         .release        = ch_release,
 135         .unlocked_ioctl = ch_ioctl,
 136 #ifdef CONFIG_COMPAT
 137         .compat_ioctl   = ch_ioctl_compat,
 138 #endif
 139 };
 140
 141 static const struct {
 142         unsigned char  sense;
 143         unsigned char  asc;
 144         unsigned char  ascq;
 145         int            errno;
 146 } err[] = {
 147 /* Just filled in what looks right. Hav'nt checked any standard paper for
 148    these errno assignments, so they may be wrong... */
 149         {
 150                 .sense  = ILLEGAL_REQUEST,
 151                 .asc    = 0x21,
 152                 .ascq   = 0x01,
 153                 .errno  = EBADSLT, /* Invalid element address */
 154         },{
 155                 .sense  = ILLEGAL_REQUEST,
 156                 .asc    = 0x28,
 157                 .ascq   = 0x01,
 158                 .errno  = EBADE,   /* Import or export element accessed */
 159         },{
 160                 .sense  = ILLEGAL_REQUEST,
 161                 .asc    = 0x3B,
 162                 .ascq   = 0x0D,
 163                 .errno  = EXFULL,  /* Medium destination element full */
 164         },{
 165                 .sense  = ILLEGAL_REQUEST,
 166                 .asc    = 0x3B,
 167                 .ascq   = 0x0E,
 168                 .errno  = EBADE,   /* Medium source element empty */
 169         },{
 170                 .sense  = ILLEGAL_REQUEST,
 171                 .asc    = 0x20,
 172                 .ascq   = 0x00,
 173                 .errno  = EBADRQC, /* Invalid command operation code */
 174         },{
 175                 /* end of list */
 176         }
 177 };
 178
 179 /* ------------------------------------------------------------------- */
 180
 181 static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 182 {
 183         int i,errno = 0;
 184
 185         /* Check to see if additional sense information is available */
 186         if (scsi_sense_valid(sshdr) &&
 187             sshdr->asc != 0) {
 188                 for (i = 0; err[i].errno != 0; i++) {
 189                         if (err[i].sense == sshdr->sense_key &&
 190                             err[i].asc   == sshdr->asc &&
 191                             err[i].ascq  == sshdr->ascq) {
 192                                 errno = -err[i].errno;
 193                                 break;
 194                         }
 195                 }
 196         }
 197         if (errno == 0)
 198                 errno = -EIO;
 199         return errno;
 200 }
 201
 202 static int
 203 ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 204            void *buffer, unsigned buflength,
 205            enum dma_data_direction direction)
 206 {
 207         int errno, retries = 0, timeout, result;
 208         struct scsi_sense_hdr sshdr;
 209
 210         timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 211                 ? timeout_init : timeout_move;
 212
 213  retry:
 214         errno = 0;
 215         if (debug) {
 216                 dprintk("command: ");
 217                 __scsi_print_command(cmd);
 218         }
 219
 220         result = scsi_execute_req(ch->device, cmd, direction, buffer,
 221                                   buflength, &sshdr, timeout * HZ,
 222                                   MAX_RETRIES);
 223
 224         dprintk("result: 0x%x\n",result);
 225         if (driver_byte(result) & DRIVER_SENSE) {
 226                 if (debug)
 227                         scsi_print_sense_hdr(ch->name, &sshdr);
 228                 errno = ch_find_errno(&sshdr);
 229
 230                 switch(sshdr.sense_key) {
 231                 case UNIT_ATTENTION:
 232                         ch->unit_attention = 1;
 233                         if (retries++ < 3)
 234                                 goto retry;
 235                         break;
 236                 }
 237         }
 238         return errno;
 239 }
 240
 241 /* ------------------------------------------------------------------------ */
 242
 243 static int
 244 ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 245 {
 246         int i;
 247
 248         for (i = 0; i < CH_TYPES; i++) {
 249                 if (elem >= ch->firsts[i]  &&
 250                     elem <  ch->firsts[i] +
 251                     ch->counts[i])
 252                         return i+1;
 253         }
 254         return 0;
 255 }
 256
 257 static int
 258 ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 259 {
 260         u_char  cmd[12];
 261         u_char  *buffer;
 262         int     result;
 263
 264         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 265         if(!buffer)
 266                 return -ENOMEM;
 267
 268  retry:
 269         memset(cmd,0,sizeof(cmd));
 270         cmd[0] = READ_ELEMENT_STATUS;
 271         cmd[1] = (ch->device->lun << 5) |
 272                 (ch->voltags ? 0x10 : 0) |
 273                 ch_elem_to_typecode(ch,elem);
 274         cmd[2] = (elem >> 8) & 0xff;
 275         cmd[3] = elem        & 0xff;
 276         cmd[5] = 1;
 277         cmd[9] = 255;
 278         if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 279                 if (((buffer[16] << 8) | buffer[17]) != elem) {
 280                         dprintk("asked for element 0x%02x, got 0x%02x\n",
 281                                 elem,(buffer[16] << 8) | buffer[17]);
 282                         kfree(buffer);
 283                         return -EIO;
 284                 }
 285                 memcpy(data,buffer+16,16);
 286         } else {
 287                 if (ch->voltags) {
 288                         ch->voltags = 0;
 289                         vprintk("device has no volume tag support\n");
 290                         goto retry;
 291                 }
 292                 dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 293         }
 294         kfree(buffer);
 295         return result;
 296 }
 297
 298 static int
 299 ch_init_elem(scsi_changer *ch)
 300 {
 301         int err;
 302         u_char cmd[6];
 303
 304         vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 305         memset(cmd,0,sizeof(cmd));
 306         cmd[0] = INITIALIZE_ELEMENT_STATUS;
 307         cmd[1] = ch->device->lun << 5;
 308         err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 309         vprintk("... finished\n");
 310         return err;
 311 }
 312
 313 static int
 314 ch_readconfig(scsi_changer *ch)
 315 {
 316         u_char  cmd[10], data[16];
 317         u_char  *buffer;
 318         int     result,id,lun,i;
 319         u_int   elem;
 320
 321         buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 322         if (!buffer)
 323                 return -ENOMEM;
 324
 325         memset(cmd,0,sizeof(cmd));
 326         cmd[0] = MODE_SENSE;
 327         cmd[1] = ch->device->lun << 5;
 328         cmd[2] = 0x1d;
 329         cmd[4] = 255;
 330         result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 331         if (0 != result) {
 332                 cmd[1] |= (1<<3);
 333                 result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 334         }
 335         if (0 == result) {
 336                 ch->firsts[CHET_MT] =
 337                         (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 338                 ch->counts[CHET_MT] =
 339                         (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 340                 ch->firsts[CHET_ST] =
 341                         (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 342                 ch->counts[CHET_ST] =
 343                         (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 344                 ch->firsts[CHET_IE] =
 345                         (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 346                 ch->counts[CHET_IE] =
 347                         (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 348                 ch->firsts[CHET_DT] =
 349                         (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 350                 ch->counts[CHET_DT] =
 351                         (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 352                 vprintk("type #1 (mt): 0x%x+%d [medium transport]\n",
 353                         ch->firsts[CHET_MT],
 354                         ch->counts[CHET_MT]);
 355                 vprintk("type #2 (st): 0x%x+%d [storage]\n",
 356                         ch->firsts[CHET_ST],
 357                         ch->counts[CHET_ST]);
 358                 vprintk("type #3 (ie): 0x%x+%d [import/export]\n",
 359                         ch->firsts[CHET_IE],
 360                         ch->counts[CHET_IE]);
 361                 vprintk("type #4 (dt): 0x%x+%d [data transfer]\n",
 362                         ch->firsts[CHET_DT],
 363                         ch->counts[CHET_DT]);
 364         } else {
 365                 vprintk("reading element address assigment page failed!\n");
 366         }
 367
 368         /* vendor specific element types */
 369         for (i = 0; i < 4; i++) {
 370                 if (0 == vendor_counts[i])
 371                         continue;
 372                 if (NULL == vendor_labels[i])
 373                         continue;
 374                 ch->firsts[CHET_V1+i] = vendor_firsts[i];
 375                 ch->counts[CHET_V1+i] = vendor_counts[i];
 376                 vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 377                         i+5,i+1,vendor_firsts[i],vendor_counts[i],
 378                         vendor_labels[i]);
 379         }
 380
 381         /* look up the devices of the data transfer elements */
 382         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
 383                          GFP_KERNEL);
 384         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 385                 id  = -1;
 386                 lun = 0;
 387                 if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 388                         id  = dt_id[elem];
 389                         lun = dt_lun[elem];
 390                         vprintk("dt 0x%x: [insmod option] ",
 391                                 elem+ch->firsts[CHET_DT]);
 392                 } else if (0 != ch_read_element_status
 393                            (ch,elem+ch->firsts[CHET_DT],data)) {
 394                         vprintk("dt 0x%x: READ ELEMENT STATUS failed\n",
 395                                 elem+ch->firsts[CHET_DT]);
 396                 } else {
 397                         vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 398                         if (data[6] & 0x80) {
 399                                 if (verbose)
 400                                         printk("not this SCSI bus\n");
 401                                 ch->dt[elem] = NULL;
 402                         } else if (0 == (data[6] & 0x30)) {
 403                                 if (verbose)
 404                                         printk("ID/LUN unknown\n");
 405                                 ch->dt[elem] = NULL;
 406                         } else {
 407                                 id  = ch->device->id;
 408                                 lun = 0;
 409                                 if (data[6] & 0x20) id  = data[7];
 410                                 if (data[6] & 0x10) lun = data[6] & 7;
 411                         }
 412                 }
 413                 if (-1 != id) {
 414                         if (verbose)
 415                                 printk("ID %i, LUN %i, ",id,lun);
 416                         ch->dt[elem] =
 417                                 scsi_device_lookup(ch->device->host,
 418                                                    ch->device->channel,
 419                                                    id,lun);
 420                         if (!ch->dt[elem]) {
 421                                 /* should not happen */
 422                                 if (verbose)
 423                                         printk("Huh? device not found!\n");
 424                         } else {
 425                                 if (verbose)
 426                                         printk("name: %8.8s %16.16s %4.4s\n",
 427                                                ch->dt[elem]->vendor,
 428                                                ch->dt[elem]->model,
 429                                                ch->dt[elem]->rev);
 430                         }
 431                 }
 432         }
 433         ch->voltags = 1;
 434         kfree(buffer);
 435
 436         return 0;
 437 }
 438
 439 /* ------------------------------------------------------------------------ */
 440
 441 static int
 442 ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 443 {
 444         u_char  cmd[10];
 445
 446         dprintk("position: 0x%x\n",elem);
 447         if (0 == trans)
 448                 trans = ch->firsts[CHET_MT];
 449         memset(cmd,0,sizeof(cmd));
 450         cmd[0]  = POSITION_TO_ELEMENT;
 451         cmd[1]  = ch->device->lun << 5;
 452         cmd[2]  = (trans >> 8) & 0xff;
 453         cmd[3]  =  trans       & 0xff;
 454         cmd[4]  = (elem  >> 8) & 0xff;
 455         cmd[5]  =  elem        & 0xff;
 456         cmd[8]  = rotate ? 1 : 0;
 457         return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 458 }
 459
 460 static int
 461 ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 462 {
 463         u_char  cmd[12];
 464
 465         dprintk("move: 0x%x => 0x%x\n",src,dest);
 466         if (0 == trans)
 467                 trans = ch->firsts[CHET_MT];
 468         memset(cmd,0,sizeof(cmd));
 469         cmd[0]  = MOVE_MEDIUM;
 470         cmd[1]  = ch->device->lun << 5;
 471         cmd[2]  = (trans >> 8) & 0xff;
 472         cmd[3]  =  trans       & 0xff;
 473         cmd[4]  = (src   >> 8) & 0xff;
 474         cmd[5]  =  src         & 0xff;
 475         cmd[6]  = (dest  >> 8) & 0xff;
 476         cmd[7]  =  dest        & 0xff;
 477         cmd[10] = rotate ? 1 : 0;
 478         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 479 }
 480
 481 static int
 482 ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 483             u_int dest1, u_int dest2, int rotate1, int rotate2)
 484 {
 485         u_char  cmd[12];
 486
 487         dprintk("exchange: 0x%x => 0x%x => 0x%x\n",
 488                 src,dest1,dest2);
 489         if (0 == trans)
 490                 trans = ch->firsts[CHET_MT];
 491         memset(cmd,0,sizeof(cmd));
 492         cmd[0]  = EXCHANGE_MEDIUM;
 493         cmd[1]  = ch->device->lun << 5;
 494         cmd[2]  = (trans >> 8) & 0xff;
 495         cmd[3]  =  trans       & 0xff;
 496         cmd[4]  = (src   >> 8) & 0xff;
 497         cmd[5]  =  src         & 0xff;
 498         cmd[6]  = (dest1 >> 8) & 0xff;
 499         cmd[7]  =  dest1       & 0xff;
 500         cmd[8]  = (dest2 >> 8) & 0xff;
 501         cmd[9]  =  dest2       & 0xff;
 502         cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 503
 504         return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 505 }
 506
 507 static void
 508 ch_check_voltag(char *tag)
 509 {
 510         int i;
 511
 512         for (i = 0; i < 32; i++) {
 513                 /* restrict to ascii */
 514                 if (tag[i] >= 0x7f || tag[i] < 0x20)
 515                         tag[i] = ' ';
 516                 /* don't allow search wildcards */
 517                 if (tag[i] == '?' ||
 518                     tag[i] == '*')
 519                         tag[i] = ' ';
 520         }
 521 }
 522
 523 static int
 524 ch_set_voltag(scsi_changer *ch, u_int elem,
 525               int alternate, int clear, u_char *tag)
 526 {
 527         u_char  cmd[12];
 528         u_char  *buffer;
 529         int result;
 530
 531         buffer = kzalloc(512, GFP_KERNEL);
 532         if (!buffer)
 533                 return -ENOMEM;
 534
 535         dprintk("%s %s voltag: 0x%x => \"%s\"\n",
 536                 clear     ? "clear"     : "set",
 537                 alternate ? "alternate" : "primary",
 538                 elem, tag);
 539         memset(cmd,0,sizeof(cmd));
 540         cmd[0]  = SEND_VOLUME_TAG;
 541         cmd[1] = (ch->device->lun << 5) |
 542                 ch_elem_to_typecode(ch,elem);
 543         cmd[2] = (elem >> 8) & 0xff;
 544         cmd[3] = elem        & 0xff;
 545         cmd[5] = clear
 546                 ? (alternate ? 0x0d : 0x0c)
 547                 : (alternate ? 0x0b : 0x0a);
 548
 549         cmd[9] = 255;
 550
 551         memcpy(buffer,tag,32);
 552         ch_check_voltag(buffer);
 553
 554         result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 555         kfree(buffer);
 556         return result;
 557 }
 558
 559 static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 560 {
 561         int retval = 0;
 562         u_char data[16];
 563         unsigned int i;
 564
 565         mutex_lock(&ch->lock);
 566         for (i = 0; i < ch->counts[type]; i++) {
 567                 if (0 != ch_read_element_status
 568                     (ch, ch->firsts[type]+i,data)) {
 569                         retval = -EIO;
 570                         break;
 571                 }
 572                 put_user(data[2], dest+i);
 573                 if (data[2] & CESTATUS_EXCEPT)
 574                         vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n",
 575                                 ch->firsts[type]+i,
 576                                 (int)data[4],(int)data[5]);
 577                 retval = ch_read_element_status
 578                         (ch, ch->firsts[type]+i,data);
 579                 if (0 != retval)
 580                         break;
 581         }
 582         mutex_unlock(&ch->lock);
 583         return retval;
 584 }
 585
 586 /* ------------------------------------------------------------------------ */
 587
 588 static int
 589 ch_release(struct inode *inode, struct file *file)
 590 {
 591         scsi_changer *ch = file->private_data;
 592
 593         scsi_device_put(ch->device);
 594         file->private_data = NULL;
 595         return 0;
 596 }
 597
 598 static int
 599 ch_open(struct inode *inode, struct file *file)
 600 {
 601         scsi_changer *tmp, *ch;
 602         int minor = iminor(inode);
 603
 604         spin_lock(&ch_devlist_lock);
 605         ch = NULL;
 606         list_for_each_entry(tmp,&ch_devlist,list) {
 607                 if (tmp->minor == minor)
 608                         ch = tmp;
 609         }
 610         if (NULL == ch || scsi_device_get(ch->device)) {
 611                 spin_unlock(&ch_devlist_lock);
 612                 return -ENXIO;
 613         }
 614         spin_unlock(&ch_devlist_lock);
 615
 616         file->private_data = ch;
 617         return 0;
 618 }
 619
 620 static int
 621 ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 622 {
 623         if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 624                 return -1;
 625         return 0;
 626 }
 627
 628 static long ch_ioctl(struct file *file,
 629                     unsigned int cmd, unsigned long arg)
 630 {
 631         scsi_changer *ch = file->private_data;
 632         int retval;
 633         void __user *argp = (void __user *)arg;
 634
 635         switch (cmd) {
 636         case CHIOGPARAMS:
 637         {
 638                 struct changer_params params;
 639
 640                 params.cp_curpicker = 0;
 641                 params.cp_npickers  = ch->counts[CHET_MT];
 642                 params.cp_nslots    = ch->counts[CHET_ST];
 643                 params.cp_nportals  = ch->counts[CHET_IE];
 644                 params.cp_ndrives   = ch->counts[CHET_DT];
 645
 646                 if (copy_to_user(argp, &params, sizeof(params)))
 647                         return -EFAULT;
 648                 return 0;
 649         }
 650         case CHIOGVPARAMS:
 651         {
 652                 struct changer_vendor_params vparams;
 653
 654                 memset(&vparams,0,sizeof(vparams));
 655                 if (ch->counts[CHET_V1]) {
 656                         vparams.cvp_n1  = ch->counts[CHET_V1];
 657                         strncpy(vparams.cvp_label1,vendor_labels[0],16);
 658                 }
 659                 if (ch->counts[CHET_V2]) {
 660                         vparams.cvp_n2  = ch->counts[CHET_V2];
 661                         strncpy(vparams.cvp_label2,vendor_labels[1],16);
 662                 }
 663                 if (ch->counts[CHET_V3]) {
 664                         vparams.cvp_n3  = ch->counts[CHET_V3];
 665                         strncpy(vparams.cvp_label3,vendor_labels[2],16);
 666                 }
 667                 if (ch->counts[CHET_V4]) {
 668                         vparams.cvp_n4  = ch->counts[CHET_V4];
 669                         strncpy(vparams.cvp_label4,vendor_labels[3],16);
 670                 }
 671                 if (copy_to_user(argp, &vparams, sizeof(vparams)))
 672                         return -EFAULT;
 673                 return 0;
 674         }
 675
 676         case CHIOPOSITION:
 677         {
 678                 struct changer_position pos;
 679
 680                 if (copy_from_user(&pos, argp, sizeof (pos)))
 681                         return -EFAULT;
 682
 683                 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 684                         dprintk("CHIOPOSITION: invalid parameter\n");
 685                         return -EBADSLT;
 686                 }
 687                 mutex_lock(&ch->lock);
 688                 retval = ch_position(ch,0,
 689                                      ch->firsts[pos.cp_type] + pos.cp_unit,
 690                                      pos.cp_flags & CP_INVERT);
 691                 mutex_unlock(&ch->lock);
 692                 return retval;
 693         }
 694
 695         case CHIOMOVE:
 696         {
 697                 struct changer_move mv;
 698
 699                 if (copy_from_user(&mv, argp, sizeof (mv)))
 700                         return -EFAULT;
 701
 702                 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 703                     0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 704                         dprintk("CHIOMOVE: invalid parameter\n");
 705                         return -EBADSLT;
 706                 }
 707
 708                 mutex_lock(&ch->lock);
 709                 retval = ch_move(ch,0,
 710                                  ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 711                                  ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 712                                  mv.cm_flags & CM_INVERT);
 713                 mutex_unlock(&ch->lock);
 714                 return retval;
 715         }
 716
 717         case CHIOEXCHANGE:
 718         {
 719                 struct changer_exchange mv;
 720
 721                 if (copy_from_user(&mv, argp, sizeof (mv)))
 722                         return -EFAULT;
 723
 724                 if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 725                     0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 726                     0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 727                         dprintk("CHIOEXCHANGE: invalid parameter\n");
 728                         return -EBADSLT;
 729                 }
 730
 731                 mutex_lock(&ch->lock);
 732                 retval = ch_exchange
 733                         (ch,0,
 734                          ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 735                          ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 736                          ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 737                          mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 738                 mutex_unlock(&ch->lock);
 739                 return retval;
 740         }
 741
 742         case CHIOGSTATUS:
 743         {
 744                 struct changer_element_status ces;
 745
 746                 if (copy_from_user(&ces, argp, sizeof (ces)))
 747                         return -EFAULT;
 748                 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 749                         return -EINVAL;
 750
 751                 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 752         }
 753
 754         case CHIOGELEM:
 755         {
 756                 struct changer_get_element cge;
 757                 u_char  cmd[12];
 758                 u_char  *buffer;
 759                 unsigned int elem;
 760                 int     result,i;
 761
 762                 if (copy_from_user(&cge, argp, sizeof (cge)))
 763                         return -EFAULT;
 764
 765                 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 766                         return -EINVAL;
 767                 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 768
 769                 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 770                 if (!buffer)
 771                         return -ENOMEM;
 772                 mutex_lock(&ch->lock);
 773
 774         voltag_retry:
 775                 memset(cmd,0,sizeof(cmd));
 776                 cmd[0] = READ_ELEMENT_STATUS;
 777                 cmd[1] = (ch->device->lun << 5) |
 778                         (ch->voltags ? 0x10 : 0) |
 779                         ch_elem_to_typecode(ch,elem);
 780                 cmd[2] = (elem >> 8) & 0xff;
 781                 cmd[3] = elem        & 0xff;
 782                 cmd[5] = 1;
 783                 cmd[9] = 255;
 784
 785                 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 786                         cge.cge_status = buffer[18];
 787                         cge.cge_flags = 0;
 788                         if (buffer[18] & CESTATUS_EXCEPT) {
 789                                 cge.cge_errno = EIO;
 790                         }
 791                         if (buffer[25] & 0x80) {
 792                                 cge.cge_flags |= CGE_SRC;
 793                                 if (buffer[25] & 0x40)
 794                                         cge.cge_flags |= CGE_INVERT;
 795                                 elem = (buffer[26]<<8) | buffer[27];
 796                                 for (i = 0; i < 4; i++) {
 797                                         if (elem >= ch->firsts[i] &&
 798                                             elem <  ch->firsts[i] + ch->counts[i]) {
 799                                                 cge.cge_srctype = i;
 800                                                 cge.cge_srcunit = elem-ch->firsts[i];
 801                                         }
 802                                 }
 803                         }
 804                         if ((buffer[22] & 0x30) == 0x30) {
 805                                 cge.cge_flags |= CGE_IDLUN;
 806                                 cge.cge_id  = buffer[23];
 807                                 cge.cge_lun = buffer[22] & 7;
 808                         }
 809                         if (buffer[9] & 0x80) {
 810                                 cge.cge_flags |= CGE_PVOLTAG;
 811                                 memcpy(cge.cge_pvoltag,buffer+28,36);
 812                         }
 813                         if (buffer[9] & 0x40) {
 814                                 cge.cge_flags |= CGE_AVOLTAG;
 815                                 memcpy(cge.cge_avoltag,buffer+64,36);
 816                         }
 817                 } else if (ch->voltags) {
 818                         ch->voltags = 0;
 819                         vprintk("device has no volume tag support\n");
 820                         goto voltag_retry;
 821                 }
 822                 kfree(buffer);
 823                 mutex_unlock(&ch->lock);
 824
 825                 if (copy_to_user(argp, &cge, sizeof (cge)))
 826                         return -EFAULT;
 827                 return result;
 828         }
 829
 830         case CHIOINITELEM:
 831         {
 832                 mutex_lock(&ch->lock);
 833                 retval = ch_init_elem(ch);
 834                 mutex_unlock(&ch->lock);
 835                 return retval;
 836         }
 837
 838         case CHIOSVOLTAG:
 839         {
 840                 struct changer_set_voltag csv;
 841                 int elem;
 842
 843                 if (copy_from_user(&csv, argp, sizeof(csv)))
 844                         return -EFAULT;
 845
 846                 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 847                         dprintk("CHIOSVOLTAG: invalid parameter\n");
 848                         return -EBADSLT;
 849                 }
 850                 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 851                 mutex_lock(&ch->lock);
 852                 retval = ch_set_voltag(ch, elem,
 853                                        csv.csv_flags & CSV_AVOLTAG,
 854                                        csv.csv_flags & CSV_CLEARTAG,
 855                                        csv.csv_voltag);
 856                 mutex_unlock(&ch->lock);
 857                 return retval;
 858         }
 859
 860         default:
 861                 return scsi_ioctl(ch->device, cmd, argp);
 862
 863         }
 864 }
 865
 866 #ifdef CONFIG_COMPAT
 867
 868 struct changer_element_status32 {
 869         int             ces_type;
 870         compat_uptr_t   ces_data;
 871 };
 872 #define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 873
 874 static long ch_ioctl_compat(struct file * file,
 875                             unsigned int cmd, unsigned long arg)
 876 {
 877         scsi_changer *ch = file->private_data;
 878
 879         switch (cmd) {
 880         case CHIOGPARAMS:
 881         case CHIOGVPARAMS:
 882         case CHIOPOSITION:
 883         case CHIOMOVE:
 884         case CHIOEXCHANGE:
 885         case CHIOGELEM:
 886         case CHIOINITELEM:
 887         case CHIOSVOLTAG:
 888                 /* compatible */
 889                 return ch_ioctl(file, cmd, arg);
 890         case CHIOGSTATUS32:
 891         {
 892                 struct changer_element_status32 ces32;
 893                 unsigned char __user *data;
 894
 895                 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 896                         return -EFAULT;
 897                 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 898                         return -EINVAL;
 899
 900                 data = compat_ptr(ces32.ces_data);
 901                 return ch_gstatus(ch, ces32.ces_type, data);
 902         }
 903         default:
 904                 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 905                 return -ENOIOCTLCMD;
 906
 907         }
 908 }
 909 #endif
 910
 911 /* ------------------------------------------------------------------------ */
 912
 913 static int ch_probe(struct device *dev)
 914 {
 915         struct scsi_device *sd = to_scsi_device(dev);
 916         struct class_device *class_dev;
 917         scsi_changer *ch;
 918
 919         if (sd->type != TYPE_MEDIUM_CHANGER)
 920                 return -ENODEV;
 921
 922         ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 923         if (NULL == ch)
 924                 return -ENOMEM;
 925
 926         ch->minor = ch_devcount;
 927         sprintf(ch->name,"ch%d",ch->minor);
 928
 929         class_dev = class_device_create(ch_sysfs_class, NULL,
 930                                         MKDEV(SCSI_CHANGER_MAJOR, ch->minor),
 931                                         dev, "s%s", ch->name);
 932         if (IS_ERR(class_dev)) {
 933                 printk(KERN_WARNING "ch%d: class_device_create failed\n",
 934                        ch->minor);
 935                 kfree(ch);
 936                 return PTR_ERR(class_dev);
 937         }
 938
 939         mutex_init(&ch->lock);
 940         ch->device = sd;
 941         ch_readconfig(ch);
 942         if (init)
 943                 ch_init_elem(ch);
 944
 945         sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 946
 947         spin_lock(&ch_devlist_lock);
 948         list_add_tail(&ch->list,&ch_devlist);
 949         ch_devcount++;
 950         spin_unlock(&ch_devlist_lock);
 951         return 0;
 952 }
 953
 954 static int ch_remove(struct device *dev)
 955 {
 956         struct scsi_device *sd = to_scsi_device(dev);
 957         scsi_changer *tmp, *ch;
 958
 959         spin_lock(&ch_devlist_lock);
 960         ch = NULL;
 961         list_for_each_entry(tmp,&ch_devlist,list) {
 962                 if (tmp->device == sd)
 963                         ch = tmp;
 964         }
 965         BUG_ON(NULL == ch);
 966         list_del(&ch->list);
 967         spin_unlock(&ch_devlist_lock);
 968
 969         class_device_destroy(ch_sysfs_class,
 970                              MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 971         kfree(ch->dt);
 972         kfree(ch);
 973         ch_devcount--;
 974         return 0;
 975 }
 976
 977 static int __init init_ch_module(void)
 978 {
 979         int rc;
 980
 981         printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 982         ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 983         if (IS_ERR(ch_sysfs_class)) {
 984                 rc = PTR_ERR(ch_sysfs_class);
 985                 return rc;
 986         }
 987         rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 988         if (rc < 0) {
 989                 printk("Unable to get major %d for SCSI-Changer\n",
 990                        SCSI_CHANGER_MAJOR);
 991                 goto fail1;
 992         }
 993         rc = scsi_register_driver(&ch_template.gendrv);
 994         if (rc < 0)
 995                 goto fail2;
 996         return 0;
 997
 998  fail2:
 999         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1000  fail1:
1001         class_destroy(ch_sysfs_class);
1002         return rc;
1003 }
1004
1005 static void __exit exit_ch_module(void)
1006 {
1007         scsi_unregister_driver(&ch_template.gendrv);
1008         unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1009         class_destroy(ch_sysfs_class);
1010 }
1011
1012 module_init(init_ch_module);
1013 module_exit(exit_ch_module);
1014
1015 /*
1016  * Local variables:
1017  * c-basic-offset: 8
1018  * End:
1019  */