linux/drivers/scsi/ch.c
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   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#include <linux/idr.h>
  25#include <linux/slab.h>
  26
  27#include <scsi/scsi.h>
  28#include <scsi/scsi_cmnd.h>
  29#include <scsi/scsi_driver.h>
  30#include <scsi/scsi_ioctl.h>
  31#include <scsi/scsi_host.h>
  32#include <scsi/scsi_device.h>
  33#include <scsi/scsi_eh.h>
  34#include <scsi/scsi_dbg.h>
  35
  36#define CH_DT_MAX       16
  37#define CH_TYPES        8
  38#define CH_MAX_DEVS     128
  39
  40MODULE_DESCRIPTION("device driver for scsi media changer devices");
  41MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
  42MODULE_LICENSE("GPL");
  43MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
  44MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
  45
  46static DEFINE_MUTEX(ch_mutex);
  47static int init = 1;
  48module_param(init, int, 0444);
  49MODULE_PARM_DESC(init, \
  50    "initialize element status on driver load (default: on)");
  51
  52static int timeout_move = 300;
  53module_param(timeout_move, int, 0644);
  54MODULE_PARM_DESC(timeout_move,"timeout for move commands "
  55                 "(default: 300 seconds)");
  56
  57static int timeout_init = 3600;
  58module_param(timeout_init, int, 0644);
  59MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
  60                 "(default: 3600 seconds)");
  61
  62static int verbose = 1;
  63module_param(verbose, int, 0644);
  64MODULE_PARM_DESC(verbose,"be verbose (default: on)");
  65
  66static int debug = 0;
  67module_param(debug, int, 0644);
  68MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
  69                 "detailed sense codes on scsi errors (default: off)");
  70
  71static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
  72static int dt_lun[CH_DT_MAX];
  73module_param_array(dt_id,  int, NULL, 0444);
  74module_param_array(dt_lun, int, NULL, 0444);
  75
  76/* tell the driver about vendor-specific slots */
  77static int vendor_firsts[CH_TYPES-4];
  78static int vendor_counts[CH_TYPES-4];
  79module_param_array(vendor_firsts, int, NULL, 0444);
  80module_param_array(vendor_counts, int, NULL, 0444);
  81
  82static const char * vendor_labels[CH_TYPES-4] = {
  83        "v0", "v1", "v2", "v3"
  84};
  85// module_param_string_array(vendor_labels, NULL, 0444);
  86
  87#define DPRINTK(fmt, arg...)                                            \
  88do {                                                                    \
  89        if (debug)                                                      \
  90                printk(KERN_DEBUG "%s: " fmt, ch->name, ##arg);         \
  91} while (0)
  92#define VPRINTK(level, fmt, arg...)                                     \
  93do {                                                                    \
  94        if (verbose)                                                    \
  95                printk(level "%s: " fmt, ch->name, ##arg);              \
  96} while (0)
  97
  98/* ------------------------------------------------------------------- */
  99
 100#define MAX_RETRIES   1
 101
 102static struct class * ch_sysfs_class;
 103
 104typedef 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
 117static DEFINE_IDR(ch_index_idr);
 118static DEFINE_SPINLOCK(ch_index_lock);
 119
 120static const struct {
 121        unsigned char  sense;
 122        unsigned char  asc;
 123        unsigned char  ascq;
 124        int            errno;
 125} ch_err[] = {
 126/* Just filled in what looks right. Hav'nt checked any standard paper for
 127   these errno assignments, so they may be wrong... */
 128        {
 129                .sense  = ILLEGAL_REQUEST,
 130                .asc    = 0x21,
 131                .ascq   = 0x01,
 132                .errno  = EBADSLT, /* Invalid element address */
 133        },{
 134                .sense  = ILLEGAL_REQUEST,
 135                .asc    = 0x28,
 136                .ascq   = 0x01,
 137                .errno  = EBADE,   /* Import or export element accessed */
 138        },{
 139                .sense  = ILLEGAL_REQUEST,
 140                .asc    = 0x3B,
 141                .ascq   = 0x0D,
 142                .errno  = EXFULL,  /* Medium destination element full */
 143        },{
 144                .sense  = ILLEGAL_REQUEST,
 145                .asc    = 0x3B,
 146                .ascq   = 0x0E,
 147                .errno  = EBADE,   /* Medium source element empty */
 148        },{
 149                .sense  = ILLEGAL_REQUEST,
 150                .asc    = 0x20,
 151                .ascq   = 0x00,
 152                .errno  = EBADRQC, /* Invalid command operation code */
 153        },{
 154                /* end of list */
 155        }
 156};
 157
 158/* ------------------------------------------------------------------- */
 159
 160static int ch_find_errno(struct scsi_sense_hdr *sshdr)
 161{
 162        int i,errno = 0;
 163
 164        /* Check to see if additional sense information is available */
 165        if (scsi_sense_valid(sshdr) &&
 166            sshdr->asc != 0) {
 167                for (i = 0; ch_err[i].errno != 0; i++) {
 168                        if (ch_err[i].sense == sshdr->sense_key &&
 169                            ch_err[i].asc   == sshdr->asc &&
 170                            ch_err[i].ascq  == sshdr->ascq) {
 171                                errno = -ch_err[i].errno;
 172                                break;
 173                        }
 174                }
 175        }
 176        if (errno == 0)
 177                errno = -EIO;
 178        return errno;
 179}
 180
 181static int
 182ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 183           void *buffer, unsigned buflength,
 184           enum dma_data_direction direction)
 185{
 186        int errno, retries = 0, timeout, result;
 187        struct scsi_sense_hdr sshdr;
 188
 189        timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
 190                ? timeout_init : timeout_move;
 191
 192 retry:
 193        errno = 0;
 194        if (debug) {
 195                DPRINTK("command: ");
 196                __scsi_print_command(cmd);
 197        }
 198
 199        result = scsi_execute_req(ch->device, cmd, direction, buffer,
 200                                  buflength, &sshdr, timeout * HZ,
 201                                  MAX_RETRIES, NULL);
 202
 203        DPRINTK("result: 0x%x\n",result);
 204        if (driver_byte(result) & DRIVER_SENSE) {
 205                if (debug)
 206                        scsi_print_sense_hdr(ch->name, &sshdr);
 207                errno = ch_find_errno(&sshdr);
 208
 209                switch(sshdr.sense_key) {
 210                case UNIT_ATTENTION:
 211                        ch->unit_attention = 1;
 212                        if (retries++ < 3)
 213                                goto retry;
 214                        break;
 215                }
 216        }
 217        return errno;
 218}
 219
 220/* ------------------------------------------------------------------------ */
 221
 222static int
 223ch_elem_to_typecode(scsi_changer *ch, u_int elem)
 224{
 225        int i;
 226
 227        for (i = 0; i < CH_TYPES; i++) {
 228                if (elem >= ch->firsts[i]  &&
 229                    elem <  ch->firsts[i] +
 230                    ch->counts[i])
 231                        return i+1;
 232        }
 233        return 0;
 234}
 235
 236static int
 237ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 238{
 239        u_char  cmd[12];
 240        u_char  *buffer;
 241        int     result;
 242
 243        buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 244        if(!buffer)
 245                return -ENOMEM;
 246
 247 retry:
 248        memset(cmd,0,sizeof(cmd));
 249        cmd[0] = READ_ELEMENT_STATUS;
 250        cmd[1] = (ch->device->lun << 5) |
 251                (ch->voltags ? 0x10 : 0) |
 252                ch_elem_to_typecode(ch,elem);
 253        cmd[2] = (elem >> 8) & 0xff;
 254        cmd[3] = elem        & 0xff;
 255        cmd[5] = 1;
 256        cmd[9] = 255;
 257        if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
 258                if (((buffer[16] << 8) | buffer[17]) != elem) {
 259                        DPRINTK("asked for element 0x%02x, got 0x%02x\n",
 260                                elem,(buffer[16] << 8) | buffer[17]);
 261                        kfree(buffer);
 262                        return -EIO;
 263                }
 264                memcpy(data,buffer+16,16);
 265        } else {
 266                if (ch->voltags) {
 267                        ch->voltags = 0;
 268                        VPRINTK(KERN_INFO, "device has no volume tag support\n");
 269                        goto retry;
 270                }
 271                DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
 272        }
 273        kfree(buffer);
 274        return result;
 275}
 276
 277static int
 278ch_init_elem(scsi_changer *ch)
 279{
 280        int err;
 281        u_char cmd[6];
 282
 283        VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
 284        memset(cmd,0,sizeof(cmd));
 285        cmd[0] = INITIALIZE_ELEMENT_STATUS;
 286        cmd[1] = ch->device->lun << 5;
 287        err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 288        VPRINTK(KERN_INFO, "... finished\n");
 289        return err;
 290}
 291
 292static int
 293ch_readconfig(scsi_changer *ch)
 294{
 295        u_char  cmd[10], data[16];
 296        u_char  *buffer;
 297        int     result,id,lun,i;
 298        u_int   elem;
 299
 300        buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
 301        if (!buffer)
 302                return -ENOMEM;
 303
 304        memset(cmd,0,sizeof(cmd));
 305        cmd[0] = MODE_SENSE;
 306        cmd[1] = ch->device->lun << 5;
 307        cmd[2] = 0x1d;
 308        cmd[4] = 255;
 309        result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 310        if (0 != result) {
 311                cmd[1] |= (1<<3);
 312                result  = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
 313        }
 314        if (0 == result) {
 315                ch->firsts[CHET_MT] =
 316                        (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
 317                ch->counts[CHET_MT] =
 318                        (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
 319                ch->firsts[CHET_ST] =
 320                        (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
 321                ch->counts[CHET_ST] =
 322                        (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
 323                ch->firsts[CHET_IE] =
 324                        (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
 325                ch->counts[CHET_IE] =
 326                        (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
 327                ch->firsts[CHET_DT] =
 328                        (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
 329                ch->counts[CHET_DT] =
 330                        (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
 331                VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
 332                        ch->firsts[CHET_MT],
 333                        ch->counts[CHET_MT]);
 334                VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
 335                        ch->firsts[CHET_ST],
 336                        ch->counts[CHET_ST]);
 337                VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
 338                        ch->firsts[CHET_IE],
 339                        ch->counts[CHET_IE]);
 340                VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
 341                        ch->firsts[CHET_DT],
 342                        ch->counts[CHET_DT]);
 343        } else {
 344                VPRINTK(KERN_INFO, "reading element address assigment page failed!\n");
 345        }
 346
 347        /* vendor specific element types */
 348        for (i = 0; i < 4; i++) {
 349                if (0 == vendor_counts[i])
 350                        continue;
 351                if (NULL == vendor_labels[i])
 352                        continue;
 353                ch->firsts[CHET_V1+i] = vendor_firsts[i];
 354                ch->counts[CHET_V1+i] = vendor_counts[i];
 355                VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
 356                        i+5,i+1,vendor_firsts[i],vendor_counts[i],
 357                        vendor_labels[i]);
 358        }
 359
 360        /* look up the devices of the data transfer elements */
 361        ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
 362                         GFP_KERNEL);
 363
 364        if (!ch->dt) {
 365                kfree(buffer);
 366                return -ENOMEM;
 367        }
 368
 369        for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
 370                id  = -1;
 371                lun = 0;
 372                if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
 373                        id  = dt_id[elem];
 374                        lun = dt_lun[elem];
 375                        VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
 376                                elem+ch->firsts[CHET_DT]);
 377                } else if (0 != ch_read_element_status
 378                           (ch,elem+ch->firsts[CHET_DT],data)) {
 379                        VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
 380                                elem+ch->firsts[CHET_DT]);
 381                } else {
 382                        VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
 383                        if (data[6] & 0x80) {
 384                                VPRINTK(KERN_CONT, "not this SCSI bus\n");
 385                                ch->dt[elem] = NULL;
 386                        } else if (0 == (data[6] & 0x30)) {
 387                                VPRINTK(KERN_CONT, "ID/LUN unknown\n");
 388                                ch->dt[elem] = NULL;
 389                        } else {
 390                                id  = ch->device->id;
 391                                lun = 0;
 392                                if (data[6] & 0x20) id  = data[7];
 393                                if (data[6] & 0x10) lun = data[6] & 7;
 394                        }
 395                }
 396                if (-1 != id) {
 397                        VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
 398                        ch->dt[elem] =
 399                                scsi_device_lookup(ch->device->host,
 400                                                   ch->device->channel,
 401                                                   id,lun);
 402                        if (!ch->dt[elem]) {
 403                                /* should not happen */
 404                                VPRINTK(KERN_CONT, "Huh? device not found!\n");
 405                        } else {
 406                                VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
 407                                        ch->dt[elem]->vendor,
 408                                        ch->dt[elem]->model,
 409                                        ch->dt[elem]->rev);
 410                        }
 411                }
 412        }
 413        ch->voltags = 1;
 414        kfree(buffer);
 415
 416        return 0;
 417}
 418
 419/* ------------------------------------------------------------------------ */
 420
 421static int
 422ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
 423{
 424        u_char  cmd[10];
 425
 426        DPRINTK("position: 0x%x\n",elem);
 427        if (0 == trans)
 428                trans = ch->firsts[CHET_MT];
 429        memset(cmd,0,sizeof(cmd));
 430        cmd[0]  = POSITION_TO_ELEMENT;
 431        cmd[1]  = ch->device->lun << 5;
 432        cmd[2]  = (trans >> 8) & 0xff;
 433        cmd[3]  =  trans       & 0xff;
 434        cmd[4]  = (elem  >> 8) & 0xff;
 435        cmd[5]  =  elem        & 0xff;
 436        cmd[8]  = rotate ? 1 : 0;
 437        return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 438}
 439
 440static int
 441ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
 442{
 443        u_char  cmd[12];
 444
 445        DPRINTK("move: 0x%x => 0x%x\n",src,dest);
 446        if (0 == trans)
 447                trans = ch->firsts[CHET_MT];
 448        memset(cmd,0,sizeof(cmd));
 449        cmd[0]  = MOVE_MEDIUM;
 450        cmd[1]  = ch->device->lun << 5;
 451        cmd[2]  = (trans >> 8) & 0xff;
 452        cmd[3]  =  trans       & 0xff;
 453        cmd[4]  = (src   >> 8) & 0xff;
 454        cmd[5]  =  src         & 0xff;
 455        cmd[6]  = (dest  >> 8) & 0xff;
 456        cmd[7]  =  dest        & 0xff;
 457        cmd[10] = rotate ? 1 : 0;
 458        return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 459}
 460
 461static int
 462ch_exchange(scsi_changer *ch, u_int trans, u_int src,
 463            u_int dest1, u_int dest2, int rotate1, int rotate2)
 464{
 465        u_char  cmd[12];
 466
 467        DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
 468                src,dest1,dest2);
 469        if (0 == trans)
 470                trans = ch->firsts[CHET_MT];
 471        memset(cmd,0,sizeof(cmd));
 472        cmd[0]  = EXCHANGE_MEDIUM;
 473        cmd[1]  = ch->device->lun << 5;
 474        cmd[2]  = (trans >> 8) & 0xff;
 475        cmd[3]  =  trans       & 0xff;
 476        cmd[4]  = (src   >> 8) & 0xff;
 477        cmd[5]  =  src         & 0xff;
 478        cmd[6]  = (dest1 >> 8) & 0xff;
 479        cmd[7]  =  dest1       & 0xff;
 480        cmd[8]  = (dest2 >> 8) & 0xff;
 481        cmd[9]  =  dest2       & 0xff;
 482        cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
 483
 484        return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
 485}
 486
 487static void
 488ch_check_voltag(char *tag)
 489{
 490        int i;
 491
 492        for (i = 0; i < 32; i++) {
 493                /* restrict to ascii */
 494                if (tag[i] >= 0x7f || tag[i] < 0x20)
 495                        tag[i] = ' ';
 496                /* don't allow search wildcards */
 497                if (tag[i] == '?' ||
 498                    tag[i] == '*')
 499                        tag[i] = ' ';
 500        }
 501}
 502
 503static int
 504ch_set_voltag(scsi_changer *ch, u_int elem,
 505              int alternate, int clear, u_char *tag)
 506{
 507        u_char  cmd[12];
 508        u_char  *buffer;
 509        int result;
 510
 511        buffer = kzalloc(512, GFP_KERNEL);
 512        if (!buffer)
 513                return -ENOMEM;
 514
 515        DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
 516                clear     ? "clear"     : "set",
 517                alternate ? "alternate" : "primary",
 518                elem, tag);
 519        memset(cmd,0,sizeof(cmd));
 520        cmd[0]  = SEND_VOLUME_TAG;
 521        cmd[1] = (ch->device->lun << 5) |
 522                ch_elem_to_typecode(ch,elem);
 523        cmd[2] = (elem >> 8) & 0xff;
 524        cmd[3] = elem        & 0xff;
 525        cmd[5] = clear
 526                ? (alternate ? 0x0d : 0x0c)
 527                : (alternate ? 0x0b : 0x0a);
 528
 529        cmd[9] = 255;
 530
 531        memcpy(buffer,tag,32);
 532        ch_check_voltag(buffer);
 533
 534        result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
 535        kfree(buffer);
 536        return result;
 537}
 538
 539static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
 540{
 541        int retval = 0;
 542        u_char data[16];
 543        unsigned int i;
 544
 545        mutex_lock(&ch->lock);
 546        for (i = 0; i < ch->counts[type]; i++) {
 547                if (0 != ch_read_element_status
 548                    (ch, ch->firsts[type]+i,data)) {
 549                        retval = -EIO;
 550                        break;
 551                }
 552                put_user(data[2], dest+i);
 553                if (data[2] & CESTATUS_EXCEPT)
 554                        VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
 555                                ch->firsts[type]+i,
 556                                (int)data[4],(int)data[5]);
 557                retval = ch_read_element_status
 558                        (ch, ch->firsts[type]+i,data);
 559                if (0 != retval)
 560                        break;
 561        }
 562        mutex_unlock(&ch->lock);
 563        return retval;
 564}
 565
 566/* ------------------------------------------------------------------------ */
 567
 568static int
 569ch_release(struct inode *inode, struct file *file)
 570{
 571        scsi_changer *ch = file->private_data;
 572
 573        scsi_device_put(ch->device);
 574        file->private_data = NULL;
 575        return 0;
 576}
 577
 578static int
 579ch_open(struct inode *inode, struct file *file)
 580{
 581        scsi_changer *ch;
 582        int minor = iminor(inode);
 583
 584        mutex_lock(&ch_mutex);
 585        spin_lock(&ch_index_lock);
 586        ch = idr_find(&ch_index_idr, minor);
 587
 588        if (NULL == ch || scsi_device_get(ch->device)) {
 589                spin_unlock(&ch_index_lock);
 590                mutex_unlock(&ch_mutex);
 591                return -ENXIO;
 592        }
 593        spin_unlock(&ch_index_lock);
 594
 595        file->private_data = ch;
 596        mutex_unlock(&ch_mutex);
 597        return 0;
 598}
 599
 600static int
 601ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
 602{
 603        if (type >= CH_TYPES  ||  unit >= ch->counts[type])
 604                return -1;
 605        return 0;
 606}
 607
 608static long ch_ioctl(struct file *file,
 609                    unsigned int cmd, unsigned long arg)
 610{
 611        scsi_changer *ch = file->private_data;
 612        int retval;
 613        void __user *argp = (void __user *)arg;
 614
 615        switch (cmd) {
 616        case CHIOGPARAMS:
 617        {
 618                struct changer_params params;
 619
 620                params.cp_curpicker = 0;
 621                params.cp_npickers  = ch->counts[CHET_MT];
 622                params.cp_nslots    = ch->counts[CHET_ST];
 623                params.cp_nportals  = ch->counts[CHET_IE];
 624                params.cp_ndrives   = ch->counts[CHET_DT];
 625
 626                if (copy_to_user(argp, &params, sizeof(params)))
 627                        return -EFAULT;
 628                return 0;
 629        }
 630        case CHIOGVPARAMS:
 631        {
 632                struct changer_vendor_params vparams;
 633
 634                memset(&vparams,0,sizeof(vparams));
 635                if (ch->counts[CHET_V1]) {
 636                        vparams.cvp_n1  = ch->counts[CHET_V1];
 637                        strncpy(vparams.cvp_label1,vendor_labels[0],16);
 638                }
 639                if (ch->counts[CHET_V2]) {
 640                        vparams.cvp_n2  = ch->counts[CHET_V2];
 641                        strncpy(vparams.cvp_label2,vendor_labels[1],16);
 642                }
 643                if (ch->counts[CHET_V3]) {
 644                        vparams.cvp_n3  = ch->counts[CHET_V3];
 645                        strncpy(vparams.cvp_label3,vendor_labels[2],16);
 646                }
 647                if (ch->counts[CHET_V4]) {
 648                        vparams.cvp_n4  = ch->counts[CHET_V4];
 649                        strncpy(vparams.cvp_label4,vendor_labels[3],16);
 650                }
 651                if (copy_to_user(argp, &vparams, sizeof(vparams)))
 652                        return -EFAULT;
 653                return 0;
 654        }
 655
 656        case CHIOPOSITION:
 657        {
 658                struct changer_position pos;
 659
 660                if (copy_from_user(&pos, argp, sizeof (pos)))
 661                        return -EFAULT;
 662
 663                if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
 664                        DPRINTK("CHIOPOSITION: invalid parameter\n");
 665                        return -EBADSLT;
 666                }
 667                mutex_lock(&ch->lock);
 668                retval = ch_position(ch,0,
 669                                     ch->firsts[pos.cp_type] + pos.cp_unit,
 670                                     pos.cp_flags & CP_INVERT);
 671                mutex_unlock(&ch->lock);
 672                return retval;
 673        }
 674
 675        case CHIOMOVE:
 676        {
 677                struct changer_move mv;
 678
 679                if (copy_from_user(&mv, argp, sizeof (mv)))
 680                        return -EFAULT;
 681
 682                if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
 683                    0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
 684                        DPRINTK("CHIOMOVE: invalid parameter\n");
 685                        return -EBADSLT;
 686                }
 687
 688                mutex_lock(&ch->lock);
 689                retval = ch_move(ch,0,
 690                                 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
 691                                 ch->firsts[mv.cm_totype]   + mv.cm_tounit,
 692                                 mv.cm_flags & CM_INVERT);
 693                mutex_unlock(&ch->lock);
 694                return retval;
 695        }
 696
 697        case CHIOEXCHANGE:
 698        {
 699                struct changer_exchange mv;
 700
 701                if (copy_from_user(&mv, argp, sizeof (mv)))
 702                        return -EFAULT;
 703
 704                if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
 705                    0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
 706                    0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
 707                        DPRINTK("CHIOEXCHANGE: invalid parameter\n");
 708                        return -EBADSLT;
 709                }
 710
 711                mutex_lock(&ch->lock);
 712                retval = ch_exchange
 713                        (ch,0,
 714                         ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
 715                         ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
 716                         ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
 717                         mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
 718                mutex_unlock(&ch->lock);
 719                return retval;
 720        }
 721
 722        case CHIOGSTATUS:
 723        {
 724                struct changer_element_status ces;
 725
 726                if (copy_from_user(&ces, argp, sizeof (ces)))
 727                        return -EFAULT;
 728                if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
 729                        return -EINVAL;
 730
 731                return ch_gstatus(ch, ces.ces_type, ces.ces_data);
 732        }
 733
 734        case CHIOGELEM:
 735        {
 736                struct changer_get_element cge;
 737                u_char ch_cmd[12];
 738                u_char *buffer;
 739                unsigned int elem;
 740                int     result,i;
 741
 742                if (copy_from_user(&cge, argp, sizeof (cge)))
 743                        return -EFAULT;
 744
 745                if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
 746                        return -EINVAL;
 747                elem = ch->firsts[cge.cge_type] + cge.cge_unit;
 748
 749                buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 750                if (!buffer)
 751                        return -ENOMEM;
 752                mutex_lock(&ch->lock);
 753
 754        voltag_retry:
 755                memset(ch_cmd, 0, sizeof(ch_cmd));
 756                ch_cmd[0] = READ_ELEMENT_STATUS;
 757                ch_cmd[1] = (ch->device->lun << 5) |
 758                        (ch->voltags ? 0x10 : 0) |
 759                        ch_elem_to_typecode(ch,elem);
 760                ch_cmd[2] = (elem >> 8) & 0xff;
 761                ch_cmd[3] = elem        & 0xff;
 762                ch_cmd[5] = 1;
 763                ch_cmd[9] = 255;
 764
 765                result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
 766                if (!result) {
 767                        cge.cge_status = buffer[18];
 768                        cge.cge_flags = 0;
 769                        if (buffer[18] & CESTATUS_EXCEPT) {
 770                                cge.cge_errno = EIO;
 771                        }
 772                        if (buffer[25] & 0x80) {
 773                                cge.cge_flags |= CGE_SRC;
 774                                if (buffer[25] & 0x40)
 775                                        cge.cge_flags |= CGE_INVERT;
 776                                elem = (buffer[26]<<8) | buffer[27];
 777                                for (i = 0; i < 4; i++) {
 778                                        if (elem >= ch->firsts[i] &&
 779                                            elem <  ch->firsts[i] + ch->counts[i]) {
 780                                                cge.cge_srctype = i;
 781                                                cge.cge_srcunit = elem-ch->firsts[i];
 782                                        }
 783                                }
 784                        }
 785                        if ((buffer[22] & 0x30) == 0x30) {
 786                                cge.cge_flags |= CGE_IDLUN;
 787                                cge.cge_id  = buffer[23];
 788                                cge.cge_lun = buffer[22] & 7;
 789                        }
 790                        if (buffer[9] & 0x80) {
 791                                cge.cge_flags |= CGE_PVOLTAG;
 792                                memcpy(cge.cge_pvoltag,buffer+28,36);
 793                        }
 794                        if (buffer[9] & 0x40) {
 795                                cge.cge_flags |= CGE_AVOLTAG;
 796                                memcpy(cge.cge_avoltag,buffer+64,36);
 797                        }
 798                } else if (ch->voltags) {
 799                        ch->voltags = 0;
 800                        VPRINTK(KERN_INFO, "device has no volume tag support\n");
 801                        goto voltag_retry;
 802                }
 803                kfree(buffer);
 804                mutex_unlock(&ch->lock);
 805
 806                if (copy_to_user(argp, &cge, sizeof (cge)))
 807                        return -EFAULT;
 808                return result;
 809        }
 810
 811        case CHIOINITELEM:
 812        {
 813                mutex_lock(&ch->lock);
 814                retval = ch_init_elem(ch);
 815                mutex_unlock(&ch->lock);
 816                return retval;
 817        }
 818
 819        case CHIOSVOLTAG:
 820        {
 821                struct changer_set_voltag csv;
 822                int elem;
 823
 824                if (copy_from_user(&csv, argp, sizeof(csv)))
 825                        return -EFAULT;
 826
 827                if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
 828                        DPRINTK("CHIOSVOLTAG: invalid parameter\n");
 829                        return -EBADSLT;
 830                }
 831                elem = ch->firsts[csv.csv_type] + csv.csv_unit;
 832                mutex_lock(&ch->lock);
 833                retval = ch_set_voltag(ch, elem,
 834                                       csv.csv_flags & CSV_AVOLTAG,
 835                                       csv.csv_flags & CSV_CLEARTAG,
 836                                       csv.csv_voltag);
 837                mutex_unlock(&ch->lock);
 838                return retval;
 839        }
 840
 841        default:
 842                return scsi_ioctl(ch->device, cmd, argp);
 843
 844        }
 845}
 846
 847#ifdef CONFIG_COMPAT
 848
 849struct changer_element_status32 {
 850        int             ces_type;
 851        compat_uptr_t   ces_data;
 852};
 853#define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
 854
 855static long ch_ioctl_compat(struct file * file,
 856                            unsigned int cmd, unsigned long arg)
 857{
 858        scsi_changer *ch = file->private_data;
 859
 860        switch (cmd) {
 861        case CHIOGPARAMS:
 862        case CHIOGVPARAMS:
 863        case CHIOPOSITION:
 864        case CHIOMOVE:
 865        case CHIOEXCHANGE:
 866        case CHIOGELEM:
 867        case CHIOINITELEM:
 868        case CHIOSVOLTAG:
 869                /* compatible */
 870                return ch_ioctl(file, cmd, arg);
 871        case CHIOGSTATUS32:
 872        {
 873                struct changer_element_status32 ces32;
 874                unsigned char __user *data;
 875
 876                if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
 877                        return -EFAULT;
 878                if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
 879                        return -EINVAL;
 880
 881                data = compat_ptr(ces32.ces_data);
 882                return ch_gstatus(ch, ces32.ces_type, data);
 883        }
 884        default:
 885                // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
 886                return -ENOIOCTLCMD;
 887
 888        }
 889}
 890#endif
 891
 892/* ------------------------------------------------------------------------ */
 893
 894static int ch_probe(struct device *dev)
 895{
 896        struct scsi_device *sd = to_scsi_device(dev);
 897        struct device *class_dev;
 898        int ret;
 899        scsi_changer *ch;
 900
 901        if (sd->type != TYPE_MEDIUM_CHANGER)
 902                return -ENODEV;
 903
 904        ch = kzalloc(sizeof(*ch), GFP_KERNEL);
 905        if (NULL == ch)
 906                return -ENOMEM;
 907
 908        idr_preload(GFP_KERNEL);
 909        spin_lock(&ch_index_lock);
 910        ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
 911        spin_unlock(&ch_index_lock);
 912        idr_preload_end();
 913
 914        if (ret < 0) {
 915                if (ret == -ENOSPC)
 916                        ret = -ENODEV;
 917                goto free_ch;
 918        }
 919
 920        ch->minor = ret;
 921        sprintf(ch->name,"ch%d",ch->minor);
 922
 923        class_dev = device_create(ch_sysfs_class, dev,
 924                                  MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
 925                                  "s%s", ch->name);
 926        if (IS_ERR(class_dev)) {
 927                printk(KERN_WARNING "ch%d: device_create failed\n",
 928                       ch->minor);
 929                ret = PTR_ERR(class_dev);
 930                goto remove_idr;
 931        }
 932
 933        mutex_init(&ch->lock);
 934        ch->device = sd;
 935        ch_readconfig(ch);
 936        if (init)
 937                ch_init_elem(ch);
 938
 939        dev_set_drvdata(dev, ch);
 940        sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 941
 942        return 0;
 943remove_idr:
 944        idr_remove(&ch_index_idr, ch->minor);
 945free_ch:
 946        kfree(ch);
 947        return ret;
 948}
 949
 950static int ch_remove(struct device *dev)
 951{
 952        scsi_changer *ch = dev_get_drvdata(dev);
 953
 954        spin_lock(&ch_index_lock);
 955        idr_remove(&ch_index_idr, ch->minor);
 956        spin_unlock(&ch_index_lock);
 957
 958        device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
 959        kfree(ch->dt);
 960        kfree(ch);
 961        return 0;
 962}
 963
 964static struct scsi_driver ch_template = {
 965        .owner          = THIS_MODULE,
 966        .gendrv         = {
 967                .name   = "ch",
 968                .probe  = ch_probe,
 969                .remove = ch_remove,
 970        },
 971};
 972
 973static const struct file_operations changer_fops = {
 974        .owner          = THIS_MODULE,
 975        .open           = ch_open,
 976        .release        = ch_release,
 977        .unlocked_ioctl = ch_ioctl,
 978#ifdef CONFIG_COMPAT
 979        .compat_ioctl   = ch_ioctl_compat,
 980#endif
 981        .llseek         = noop_llseek,
 982};
 983
 984static int __init init_ch_module(void)
 985{
 986        int rc;
 987
 988        printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
 989        ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
 990        if (IS_ERR(ch_sysfs_class)) {
 991                rc = PTR_ERR(ch_sysfs_class);
 992                return rc;
 993        }
 994        rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
 995        if (rc < 0) {
 996                printk("Unable to get major %d for SCSI-Changer\n",
 997                       SCSI_CHANGER_MAJOR);
 998                goto fail1;
 999        }
1000        rc = scsi_register_driver(&ch_template.gendrv);
1001        if (rc < 0)
1002                goto fail2;
1003        return 0;
1004
1005 fail2:
1006        unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1007 fail1:
1008        class_destroy(ch_sysfs_class);
1009        return rc;
1010}
1011
1012static void __exit exit_ch_module(void)
1013{
1014        scsi_unregister_driver(&ch_template.gendrv);
1015        unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1016        class_destroy(ch_sysfs_class);
1017        idr_destroy(&ch_index_idr);
1018}
1019
1020module_init(init_ch_module);
1021module_exit(exit_ch_module);
1022
1023/*
1024 * Local variables:
1025 * c-basic-offset: 8
1026 * End:
1027 */
1028
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