drivers/scsi/scsi_transport_spi.c

   1 /*
   2  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/ctype.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/blkdev.h>
  26 #include <asm/semaphore.h>
  27 #include <scsi/scsi.h>
  28 #include "scsi_priv.h"
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_request.h>
  32 #include <scsi/scsi_eh.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_spi.h>
  35
  36 #define SPI_PRINTK(x, l, f, a...)       dev_printk(l, &(x)->dev, f , ##a)
  37
  38 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  39 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  40                                  * on" attributes */
  41 #define SPI_HOST_ATTRS  1
  42
  43 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
  44
  45 #define DV_LOOPS        3
  46 #define DV_TIMEOUT      (10*HZ)
  47 #define DV_RETRIES      3       /* should only need at most
  48                                  * two cc/ua clears */
  49
  50 /* Private data accessors (keep these out of the header file) */
  51 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
  52 #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem)
  53
  54 struct spi_internal {
  55         struct scsi_transport_template t;
  56         struct spi_function_template *f;
  57         /* The actual attributes */
  58         struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
  59         /* The array of null terminated pointers to attributes
  60          * needed by scsi_sysfs.c */
  61         struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
  62         struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
  63         struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
  64 };
  65
  66 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  67
  68 static const int ppr_to_ps[] = {
  69         /* The PPR values 0-6 are reserved, fill them in when
  70          * the committee defines them */
  71         -1,                     /* 0x00 */
  72         -1,                     /* 0x01 */
  73         -1,                     /* 0x02 */
  74         -1,                     /* 0x03 */
  75         -1,                     /* 0x04 */
  76         -1,                     /* 0x05 */
  77         -1,                     /* 0x06 */
  78          3125,                  /* 0x07 */
  79          6250,                  /* 0x08 */
  80         12500,                  /* 0x09 */
  81         25000,                  /* 0x0a */
  82         30300,                  /* 0x0b */
  83         50000,                  /* 0x0c */
  84 };
  85 /* The PPR values at which you calculate the period in ns by multiplying
  86  * by 4 */
  87 #define SPI_STATIC_PPR  0x0c
  88
  89 static int sprint_frac(char *dest, int value, int denom)
  90 {
  91         int frac = value % denom;
  92         int result = sprintf(dest, "%d", value / denom);
  93
  94         if (frac == 0)
  95                 return result;
  96         dest[result++] = '.';
  97
  98         do {
  99                 denom /= 10;
 100                 sprintf(dest + result, "%d", frac / denom);
 101                 result++;
 102                 frac %= denom;
 103         } while (frac);
 104
 105         dest[result++] = '\0';
 106         return result;
 107 }
 108
 109 /* Modification of scsi_wait_req that will clear UNIT ATTENTION conditions
 110  * resulting from (likely) bus and device resets */
 111 static void spi_wait_req(struct scsi_request *sreq, const void *cmd,
 112                          void *buffer, unsigned bufflen)
 113 {
 114         int i;
 115
 116         for(i = 0; i < DV_RETRIES; i++) {
 117                 sreq->sr_request->flags |= REQ_FAILFAST;
 118
 119                 scsi_wait_req(sreq, cmd, buffer, bufflen,
 120                               DV_TIMEOUT, /* retries */ 1);
 121                 if (sreq->sr_result & DRIVER_SENSE) {
 122                         struct scsi_sense_hdr sshdr;
 123
 124                         if (scsi_request_normalize_sense(sreq, &sshdr)
 125                             && sshdr.sense_key == UNIT_ATTENTION)
 126                                 continue;
 127                 }
 128                 break;
 129         }
 130 }
 131
 132 static struct {
 133         enum spi_signal_type    value;
 134         char                    *name;
 135 } signal_types[] = {
 136         { SPI_SIGNAL_UNKNOWN, "unknown" },
 137         { SPI_SIGNAL_SE, "SE" },
 138         { SPI_SIGNAL_LVD, "LVD" },
 139         { SPI_SIGNAL_HVD, "HVD" },
 140 };
 141
 142 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 143 {
 144         int i;
 145
 146         for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
 147                 if (type == signal_types[i].value)
 148                         return signal_types[i].name;
 149         }
 150         return NULL;
 151 }
 152 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 153 {
 154         int i, len;
 155
 156         for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
 157                 len =  strlen(signal_types[i].name);
 158                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 159                     (name[len] == '\n' || name[len] == '\0'))
 160                         return signal_types[i].value;
 161         }
 162         return SPI_SIGNAL_UNKNOWN;
 163 }
 164
 165 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 166                           struct class_device *cdev)
 167 {
 168         struct Scsi_Host *shost = dev_to_shost(dev);
 169
 170         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 171
 172         return 0;
 173 }
 174
 175 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 176                                "spi_host",
 177                                spi_host_setup,
 178                                NULL,
 179                                NULL);
 180
 181 static int spi_host_match(struct attribute_container *cont,
 182                           struct device *dev)
 183 {
 184         struct Scsi_Host *shost;
 185         struct spi_internal *i;
 186
 187         if (!scsi_is_host_device(dev))
 188                 return 0;
 189
 190         shost = dev_to_shost(dev);
 191         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 192             != &spi_host_class.class)
 193                 return 0;
 194
 195         i = to_spi_internal(shost->transportt);
 196
 197         return &i->t.host_attrs.ac == cont;
 198 }
 199
 200 static int spi_device_configure(struct transport_container *tc,
 201                                 struct device *dev,
 202                                 struct class_device *cdev)
 203 {
 204         struct scsi_device *sdev = to_scsi_device(dev);
 205         struct scsi_target *starget = sdev->sdev_target;
 206
 207         /* Populate the target capability fields with the values
 208          * gleaned from the device inquiry */
 209
 210         spi_support_sync(starget) = scsi_device_sync(sdev);
 211         spi_support_wide(starget) = scsi_device_wide(sdev);
 212         spi_support_dt(starget) = scsi_device_dt(sdev);
 213         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 214         spi_support_ius(starget) = scsi_device_ius(sdev);
 215         spi_support_qas(starget) = scsi_device_qas(sdev);
 216
 217         return 0;
 218 }
 219
 220 static int spi_setup_transport_attrs(struct transport_container *tc,
 221                                      struct device *dev,
 222                                      struct class_device *cdev)
 223 {
 224         struct scsi_target *starget = to_scsi_target(dev);
 225
 226         spi_period(starget) = -1;       /* illegal value */
 227         spi_min_period(starget) = 0;
 228         spi_offset(starget) = 0;        /* async */
 229         spi_max_offset(starget) = 255;
 230         spi_width(starget) = 0; /* narrow */
 231         spi_max_width(starget) = 1;
 232         spi_iu(starget) = 0;    /* no IU */
 233         spi_dt(starget) = 0;    /* ST */
 234         spi_qas(starget) = 0;
 235         spi_wr_flow(starget) = 0;
 236         spi_rd_strm(starget) = 0;
 237         spi_rti(starget) = 0;
 238         spi_pcomp_en(starget) = 0;
 239         spi_hold_mcs(starget) = 0;
 240         spi_dv_pending(starget) = 0;
 241         spi_initial_dv(starget) = 0;
 242         init_MUTEX(&spi_dv_sem(starget));
 243
 244         return 0;
 245 }
 246
 247 #define spi_transport_show_simple(field, format_string)                 \
 248                                                                         \
 249 static ssize_t                                                          \
 250 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 251 {                                                                       \
 252         struct scsi_target *starget = transport_class_to_starget(cdev); \
 253         struct spi_transport_attrs *tp;                                 \
 254                                                                         \
 255         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 256         return snprintf(buf, 20, format_string, tp->field);             \
 257 }
 258
 259 #define spi_transport_store_simple(field, format_string)                \
 260                                                                         \
 261 static ssize_t                                                          \
 262 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 263                             size_t count)                               \
 264 {                                                                       \
 265         int val;                                                        \
 266         struct scsi_target *starget = transport_class_to_starget(cdev); \
 267         struct spi_transport_attrs *tp;                                 \
 268                                                                         \
 269         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 270         val = simple_strtoul(buf, NULL, 0);                             \
 271         tp->field = val;                                                \
 272         return count;                                                   \
 273 }
 274
 275 #define spi_transport_show_function(field, format_string)               \
 276                                                                         \
 277 static ssize_t                                                          \
 278 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 279 {                                                                       \
 280         struct scsi_target *starget = transport_class_to_starget(cdev); \
 281         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 282         struct spi_transport_attrs *tp;                                 \
 283         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 284         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 285         if (i->f->get_##field)                                          \
 286                 i->f->get_##field(starget);                             \
 287         return snprintf(buf, 20, format_string, tp->field);             \
 288 }
 289
 290 #define spi_transport_store_function(field, format_string)              \
 291 static ssize_t                                                          \
 292 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 293                             size_t count)                               \
 294 {                                                                       \
 295         int val;                                                        \
 296         struct scsi_target *starget = transport_class_to_starget(cdev); \
 297         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 298         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 299                                                                         \
 300         val = simple_strtoul(buf, NULL, 0);                             \
 301         i->f->set_##field(starget, val);                        \
 302         return count;                                                   \
 303 }
 304
 305 #define spi_transport_store_max(field, format_string)                   \
 306 static ssize_t                                                          \
 307 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 308                             size_t count)                               \
 309 {                                                                       \
 310         int val;                                                        \
 311         struct scsi_target *starget = transport_class_to_starget(cdev); \
 312         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 313         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 314         struct spi_transport_attrs *tp                                  \
 315                 = (struct spi_transport_attrs *)&starget->starget_data; \
 316                                                                         \
 317         val = simple_strtoul(buf, NULL, 0);                             \
 318         if (val > tp->max_##field)                                      \
 319                 val = tp->max_##field;                                  \
 320         i->f->set_##field(starget, val);                                \
 321         return count;                                                   \
 322 }
 323
 324 #define spi_transport_rd_attr(field, format_string)                     \
 325         spi_transport_show_function(field, format_string)               \
 326         spi_transport_store_function(field, format_string)              \
 327 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 328                          show_spi_transport_##field,                    \
 329                          store_spi_transport_##field);
 330
 331 #define spi_transport_simple_attr(field, format_string)                 \
 332         spi_transport_show_simple(field, format_string)                 \
 333         spi_transport_store_simple(field, format_string)                \
 334 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 335                          show_spi_transport_##field,                    \
 336                          store_spi_transport_##field);
 337
 338 #define spi_transport_max_attr(field, format_string)                    \
 339         spi_transport_show_function(field, format_string)               \
 340         spi_transport_store_max(field, format_string)                   \
 341         spi_transport_simple_attr(max_##field, format_string)           \
 342 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 343                          show_spi_transport_##field,                    \
 344                          store_spi_transport_##field);
 345
 346 /* The Parallel SCSI Tranport Attributes: */
 347 spi_transport_max_attr(offset, "%d\n");
 348 spi_transport_max_attr(width, "%d\n");
 349 spi_transport_rd_attr(iu, "%d\n");
 350 spi_transport_rd_attr(dt, "%d\n");
 351 spi_transport_rd_attr(qas, "%d\n");
 352 spi_transport_rd_attr(wr_flow, "%d\n");
 353 spi_transport_rd_attr(rd_strm, "%d\n");
 354 spi_transport_rd_attr(rti, "%d\n");
 355 spi_transport_rd_attr(pcomp_en, "%d\n");
 356 spi_transport_rd_attr(hold_mcs, "%d\n");
 357
 358 /* we only care about the first child device so we return 1 */
 359 static int child_iter(struct device *dev, void *data)
 360 {
 361         struct scsi_device *sdev = to_scsi_device(dev);
 362
 363         spi_dv_device(sdev);
 364         return 1;
 365 }
 366
 367 static ssize_t
 368 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
 369 {
 370         struct scsi_target *starget = transport_class_to_starget(cdev);
 371
 372         device_for_each_child(&starget->dev, NULL, child_iter);
 373         return count;
 374 }
 375 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 376
 377 /* Translate the period into ns according to the current spec
 378  * for SDTR/PPR messages */
 379 static ssize_t
 380 show_spi_transport_period_helper(struct class_device *cdev, char *buf,
 381                                  int period)
 382 {
 383         int len, picosec;
 384
 385         if (period < 0 || period > 0xff) {
 386                 picosec = -1;
 387         } else if (period <= SPI_STATIC_PPR) {
 388                 picosec = ppr_to_ps[period];
 389         } else {
 390                 picosec = period * 4000;
 391         }
 392
 393         if (picosec == -1) {
 394                 len = sprintf(buf, "reserved");
 395         } else {
 396                 len = sprint_frac(buf, picosec, 1000);
 397         }
 398
 399         buf[len++] = '\n';
 400         buf[len] = '\0';
 401         return len;
 402 }
 403
 404 static ssize_t
 405 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
 406                                   size_t count, int *periodp)
 407 {
 408         int j, picosec, period = -1;
 409         char *endp;
 410
 411         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 412         if (*endp == '.') {
 413                 int mult = 100;
 414                 do {
 415                         endp++;
 416                         if (!isdigit(*endp))
 417                                 break;
 418                         picosec += (*endp - '0') * mult;
 419                         mult /= 10;
 420                 } while (mult > 0);
 421         }
 422
 423         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 424                 if (ppr_to_ps[j] < picosec)
 425                         continue;
 426                 period = j;
 427                 break;
 428         }
 429
 430         if (period == -1)
 431                 period = picosec / 4000;
 432
 433         if (period > 0xff)
 434                 period = 0xff;
 435
 436         *periodp = period;
 437
 438         return count;
 439 }
 440
 441 static ssize_t
 442 show_spi_transport_period(struct class_device *cdev, char *buf)
 443 {
 444         struct scsi_target *starget = transport_class_to_starget(cdev);
 445         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 446         struct spi_internal *i = to_spi_internal(shost->transportt);
 447         struct spi_transport_attrs *tp =
 448                 (struct spi_transport_attrs *)&starget->starget_data;
 449
 450         if (i->f->get_period)
 451                 i->f->get_period(starget);
 452
 453         return show_spi_transport_period_helper(cdev, buf, tp->period);
 454 }
 455
 456 static ssize_t
 457 store_spi_transport_period(struct class_device *cdev, const char *buf,
 458                             size_t count)
 459 {
 460         struct scsi_target *starget = transport_class_to_starget(cdev);
 461         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 462         struct spi_internal *i = to_spi_internal(shost->transportt);
 463         struct spi_transport_attrs *tp =
 464                 (struct spi_transport_attrs *)&starget->starget_data;
 465         int period, retval;
 466
 467         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 468
 469         if (period < tp->min_period)
 470                 period = tp->min_period;
 471
 472         i->f->set_period(starget, period);
 473
 474         return retval;
 475 }
 476
 477 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
 478                          show_spi_transport_period,
 479                          store_spi_transport_period);
 480
 481 static ssize_t
 482 show_spi_transport_min_period(struct class_device *cdev, char *buf)
 483 {
 484         struct scsi_target *starget = transport_class_to_starget(cdev);
 485         struct spi_transport_attrs *tp =
 486                 (struct spi_transport_attrs *)&starget->starget_data;
 487
 488         return show_spi_transport_period_helper(cdev, buf, tp->min_period);
 489 }
 490
 491 static ssize_t
 492 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
 493                             size_t count)
 494 {
 495         struct scsi_target *starget = transport_class_to_starget(cdev);
 496         struct spi_transport_attrs *tp =
 497                 (struct spi_transport_attrs *)&starget->starget_data;
 498
 499         return store_spi_transport_period_helper(cdev, buf, count,
 500                                                  &tp->min_period);
 501 }
 502
 503
 504 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
 505                          show_spi_transport_min_period,
 506                          store_spi_transport_min_period);
 507
 508
 509 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
 510 {
 511         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 512         struct spi_internal *i = to_spi_internal(shost->transportt);
 513
 514         if (i->f->get_signalling)
 515                 i->f->get_signalling(shost);
 516
 517         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 518 }
 519 static ssize_t store_spi_host_signalling(struct class_device *cdev,
 520                                          const char *buf, size_t count)
 521 {
 522         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 523         struct spi_internal *i = to_spi_internal(shost->transportt);
 524         enum spi_signal_type type = spi_signal_to_value(buf);
 525
 526         if (type != SPI_SIGNAL_UNKNOWN)
 527                 i->f->set_signalling(shost, type);
 528
 529         return count;
 530 }
 531 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
 532                          show_spi_host_signalling,
 533                          store_spi_host_signalling);
 534
 535 #define DV_SET(x, y)                    \
 536         if(i->f->set_##x)               \
 537                 i->f->set_##x(sdev->sdev_target, y)
 538
 539 enum spi_compare_returns {
 540         SPI_COMPARE_SUCCESS,
 541         SPI_COMPARE_FAILURE,
 542         SPI_COMPARE_SKIP_TEST,
 543 };
 544
 545
 546 /* This is for read/write Domain Validation:  If the device supports
 547  * an echo buffer, we do read/write tests to it */
 548 static enum spi_compare_returns
 549 spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer,
 550                           u8 *ptr, const int retries)
 551 {
 552         struct scsi_device *sdev = sreq->sr_device;
 553         int len = ptr - buffer;
 554         int j, k, r;
 555         unsigned int pattern = 0x0000ffff;
 556
 557         const char spi_write_buffer[] = {
 558                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 559         };
 560         const char spi_read_buffer[] = {
 561                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 562         };
 563
 564         /* set up the pattern buffer.  Doesn't matter if we spill
 565          * slightly beyond since that's where the read buffer is */
 566         for (j = 0; j < len; ) {
 567
 568                 /* fill the buffer with counting (test a) */
 569                 for ( ; j < min(len, 32); j++)
 570                         buffer[j] = j;
 571                 k = j;
 572                 /* fill the buffer with alternating words of 0x0 and
 573                  * 0xffff (test b) */
 574                 for ( ; j < min(len, k + 32); j += 2) {
 575                         u16 *word = (u16 *)&buffer[j];
 576
 577                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 578                 }
 579                 k = j;
 580                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 581                  * (test c) */
 582                 for ( ; j < min(len, k + 32); j += 2) {
 583                         u16 *word = (u16 *)&buffer[j];
 584
 585                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 586                 }
 587                 k = j;
 588                 /* fill with shifting bits (test d) */
 589                 for ( ; j < min(len, k + 32); j += 4) {
 590                         u32 *word = (unsigned int *)&buffer[j];
 591                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 592
 593                         *word = pattern;
 594                         pattern = (pattern << 1) | roll;
 595                 }
 596                 /* don't bother with random data (test e) */
 597         }
 598
 599         for (r = 0; r < retries; r++) {
 600                 sreq->sr_cmd_len = 0;   /* wait_req to fill in */
 601                 sreq->sr_data_direction = DMA_TO_DEVICE;
 602                 spi_wait_req(sreq, spi_write_buffer, buffer, len);
 603                 if(sreq->sr_result || !scsi_device_online(sdev)) {
 604                         struct scsi_sense_hdr sshdr;
 605
 606                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 607                         if (scsi_request_normalize_sense(sreq, &sshdr)
 608                             && sshdr.sense_key == ILLEGAL_REQUEST
 609                             /* INVALID FIELD IN CDB */
 610                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 611                                 /* This would mean that the drive lied
 612                                  * to us about supporting an echo
 613                                  * buffer (unfortunately some Western
 614                                  * Digital drives do precisely this)
 615                                  */
 616                                 return SPI_COMPARE_SKIP_TEST;
 617
 618
 619                         SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Write Buffer failure %x\n", sreq->sr_result);
 620                         return SPI_COMPARE_FAILURE;
 621                 }
 622
 623                 memset(ptr, 0, len);
 624                 sreq->sr_cmd_len = 0;   /* wait_req to fill in */
 625                 sreq->sr_data_direction = DMA_FROM_DEVICE;
 626                 spi_wait_req(sreq, spi_read_buffer, ptr, len);
 627                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 628
 629                 if (memcmp(buffer, ptr, len) != 0)
 630                         return SPI_COMPARE_FAILURE;
 631         }
 632         return SPI_COMPARE_SUCCESS;
 633 }
 634
 635 /* This is for the simplest form of Domain Validation: a read test
 636  * on the inquiry data from the device */
 637 static enum spi_compare_returns
 638 spi_dv_device_compare_inquiry(struct scsi_request *sreq, u8 *buffer,
 639                               u8 *ptr, const int retries)
 640 {
 641         int r;
 642         const int len = sreq->sr_device->inquiry_len;
 643         struct scsi_device *sdev = sreq->sr_device;
 644         const char spi_inquiry[] = {
 645                 INQUIRY, 0, 0, 0, len, 0
 646         };
 647
 648         for (r = 0; r < retries; r++) {
 649                 sreq->sr_cmd_len = 0;   /* wait_req to fill in */
 650                 sreq->sr_data_direction = DMA_FROM_DEVICE;
 651
 652                 memset(ptr, 0, len);
 653
 654                 spi_wait_req(sreq, spi_inquiry, ptr, len);
 655
 656                 if(sreq->sr_result || !scsi_device_online(sdev)) {
 657                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 658                         return SPI_COMPARE_FAILURE;
 659                 }
 660
 661                 /* If we don't have the inquiry data already, the
 662                  * first read gets it */
 663                 if (ptr == buffer) {
 664                         ptr += len;
 665                         --r;
 666                         continue;
 667                 }
 668
 669                 if (memcmp(buffer, ptr, len) != 0)
 670                         /* failure */
 671                         return SPI_COMPARE_FAILURE;
 672         }
 673         return SPI_COMPARE_SUCCESS;
 674 }
 675
 676 static enum spi_compare_returns
 677 spi_dv_retrain(struct scsi_request *sreq, u8 *buffer, u8 *ptr,
 678                enum spi_compare_returns
 679                (*compare_fn)(struct scsi_request *, u8 *, u8 *, int))
 680 {
 681         struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt);
 682         struct scsi_device *sdev = sreq->sr_device;
 683         struct scsi_target *starget = sdev->sdev_target;
 684         int period = 0, prevperiod = 0;
 685         enum spi_compare_returns retval;
 686
 687
 688         for (;;) {
 689                 int newperiod;
 690                 retval = compare_fn(sreq, buffer, ptr, DV_LOOPS);
 691
 692                 if (retval == SPI_COMPARE_SUCCESS
 693                     || retval == SPI_COMPARE_SKIP_TEST)
 694                         break;
 695
 696                 /* OK, retrain, fallback */
 697                 if (i->f->get_iu)
 698                         i->f->get_iu(starget);
 699                 if (i->f->get_qas)
 700                         i->f->get_qas(starget);
 701                 if (i->f->get_period)
 702                         i->f->get_period(sdev->sdev_target);
 703
 704                 /* Here's the fallback sequence; first try turning off
 705                  * IU, then QAS (if we can control them), then finally
 706                  * fall down the periods */
 707                 if (i->f->set_iu && spi_iu(starget)) {
 708                         SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Information Units\n");
 709                         DV_SET(iu, 0);
 710                 } else if (i->f->set_qas && spi_qas(starget)) {
 711                         SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Quick Arbitration and Selection\n");
 712                         DV_SET(qas, 0);
 713                 } else {
 714                         newperiod = spi_period(starget);
 715                         period = newperiod > period ? newperiod : period;
 716                         if (period < 0x0d)
 717                                 period++;
 718                         else
 719                                 period += period >> 1;
 720
 721                         if (unlikely(period > 0xff || period == prevperiod)) {
 722                                 /* Total failure; set to async and return */
 723                                 SPI_PRINTK(starget, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n");
 724                                 DV_SET(offset, 0);
 725                                 return SPI_COMPARE_FAILURE;
 726                         }
 727                         SPI_PRINTK(starget, KERN_ERR, "Domain Validation detected failure, dropping back\n");
 728                         DV_SET(period, period);
 729                         prevperiod = period;
 730                 }
 731         }
 732         return retval;
 733 }
 734
 735 static int
 736 spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer)
 737 {
 738         int l;
 739
 740         /* first off do a test unit ready.  This can error out
 741          * because of reservations or some other reason.  If it
 742          * fails, the device won't let us write to the echo buffer
 743          * so just return failure */
 744
 745         const char spi_test_unit_ready[] = {
 746                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 747         };
 748
 749         const char spi_read_buffer_descriptor[] = {
 750                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 751         };
 752
 753
 754         sreq->sr_cmd_len = 0;
 755         sreq->sr_data_direction = DMA_NONE;
 756
 757         /* We send a set of three TURs to clear any outstanding
 758          * unit attention conditions if they exist (Otherwise the
 759          * buffer tests won't be happy).  If the TUR still fails
 760          * (reservation conflict, device not ready, etc) just
 761          * skip the write tests */
 762         for (l = 0; ; l++) {
 763                 spi_wait_req(sreq, spi_test_unit_ready, NULL, 0);
 764
 765                 if(sreq->sr_result) {
 766                         if(l >= 3)
 767                                 return 0;
 768                 } else {
 769                         /* TUR succeeded */
 770                         break;
 771                 }
 772         }
 773
 774         sreq->sr_cmd_len = 0;
 775         sreq->sr_data_direction = DMA_FROM_DEVICE;
 776
 777         spi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4);
 778
 779         if (sreq->sr_result)
 780                 /* Device has no echo buffer */
 781                 return 0;
 782
 783         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 784 }
 785
 786 static void
 787 spi_dv_device_internal(struct scsi_request *sreq, u8 *buffer)
 788 {
 789         struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt);
 790         struct scsi_device *sdev = sreq->sr_device;
 791         struct scsi_target *starget = sdev->sdev_target;
 792         int len = sdev->inquiry_len;
 793         /* first set us up for narrow async */
 794         DV_SET(offset, 0);
 795         DV_SET(width, 0);
 796
 797         if (spi_dv_device_compare_inquiry(sreq, buffer, buffer, DV_LOOPS)
 798             != SPI_COMPARE_SUCCESS) {
 799                 SPI_PRINTK(starget, KERN_ERR, "Domain Validation Initial Inquiry Failed\n");
 800                 /* FIXME: should probably offline the device here? */
 801                 return;
 802         }
 803
 804         /* test width */
 805         if (i->f->set_width && spi_max_width(starget) &&
 806             scsi_device_wide(sdev)) {
 807                 i->f->set_width(starget, 1);
 808
 809                 if (spi_dv_device_compare_inquiry(sreq, buffer,
 810                                                    buffer + len,
 811                                                    DV_LOOPS)
 812                     != SPI_COMPARE_SUCCESS) {
 813                         SPI_PRINTK(starget, KERN_ERR, "Wide Transfers Fail\n");
 814                         i->f->set_width(starget, 0);
 815                 }
 816         }
 817
 818         if (!i->f->set_period)
 819                 return;
 820
 821         /* device can't handle synchronous */
 822         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
 823                 return;
 824
 825         /* see if the device has an echo buffer.  If it does we can
 826          * do the SPI pattern write tests */
 827
 828         len = 0;
 829         if (scsi_device_dt(sdev))
 830                 len = spi_dv_device_get_echo_buffer(sreq, buffer);
 831
 832  retry:
 833
 834         /* now set up to the maximum */
 835         DV_SET(offset, spi_max_offset(starget));
 836         DV_SET(period, spi_min_period(starget));
 837         /* try QAS requests; this should be harmless to set if the
 838          * target supports it */
 839         if (scsi_device_qas(sdev))
 840                 DV_SET(qas, 1);
 841         /* Also try IU transfers */
 842         if (scsi_device_ius(sdev))
 843                 DV_SET(iu, 1);
 844         if (spi_min_period(starget) < 9) {
 845                 /* This u320 (or u640). Ignore the coupled parameters
 846                  * like DT and IU, but set the optional ones */
 847                 DV_SET(rd_strm, 1);
 848                 DV_SET(wr_flow, 1);
 849                 DV_SET(rti, 1);
 850                 if (spi_min_period(starget) == 8)
 851                         DV_SET(pcomp_en, 1);
 852         }
 853
 854         if (len == 0) {
 855                 SPI_PRINTK(starget, KERN_INFO, "Domain Validation skipping write tests\n");
 856                 spi_dv_retrain(sreq, buffer, buffer + len,
 857                                spi_dv_device_compare_inquiry);
 858                 return;
 859         }
 860
 861         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 862                 SPI_PRINTK(starget, KERN_WARNING, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 863                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 864         }
 865
 866         if (spi_dv_retrain(sreq, buffer, buffer + len,
 867                            spi_dv_device_echo_buffer)
 868             == SPI_COMPARE_SKIP_TEST) {
 869                 /* OK, the stupid drive can't do a write echo buffer
 870                  * test after all, fall back to the read tests */
 871                 len = 0;
 872                 goto retry;
 873         }
 874 }
 875
 876
 877 /**     spi_dv_device - Do Domain Validation on the device
 878  *      @sdev:          scsi device to validate
 879  *
 880  *      Performs the domain validation on the given device in the
 881  *      current execution thread.  Since DV operations may sleep,
 882  *      the current thread must have user context.  Also no SCSI
 883  *      related locks that would deadlock I/O issued by the DV may
 884  *      be held.
 885  */
 886 void
 887 spi_dv_device(struct scsi_device *sdev)
 888 {
 889         struct scsi_request *sreq = scsi_allocate_request(sdev, GFP_KERNEL);
 890         struct scsi_target *starget = sdev->sdev_target;
 891         u8 *buffer;
 892         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 893
 894         if (unlikely(!sreq))
 895                 return;
 896
 897         if (unlikely(scsi_device_get(sdev)))
 898                 goto out_free_req;
 899
 900         buffer = kmalloc(len, GFP_KERNEL);
 901
 902         if (unlikely(!buffer))
 903                 goto out_put;
 904
 905         memset(buffer, 0, len);
 906
 907         /* We need to verify that the actual device will quiesce; the
 908          * later target quiesce is just a nice to have */
 909         if (unlikely(scsi_device_quiesce(sdev)))
 910                 goto out_free;
 911
 912         scsi_target_quiesce(starget);
 913
 914         spi_dv_pending(starget) = 1;
 915         down(&spi_dv_sem(starget));
 916
 917         SPI_PRINTK(starget, KERN_INFO, "Beginning Domain Validation\n");
 918
 919         spi_dv_device_internal(sreq, buffer);
 920
 921         SPI_PRINTK(starget, KERN_INFO, "Ending Domain Validation\n");
 922
 923         up(&spi_dv_sem(starget));
 924         spi_dv_pending(starget) = 0;
 925
 926         scsi_target_resume(starget);
 927
 928         spi_initial_dv(starget) = 1;
 929
 930  out_free:
 931         kfree(buffer);
 932  out_put:
 933         scsi_device_put(sdev);
 934  out_free_req:
 935         scsi_release_request(sreq);
 936 }
 937 EXPORT_SYMBOL(spi_dv_device);
 938
 939 struct work_queue_wrapper {
 940         struct work_struct      work;
 941         struct scsi_device      *sdev;
 942 };
 943
 944 static void
 945 spi_dv_device_work_wrapper(void *data)
 946 {
 947         struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
 948         struct scsi_device *sdev = wqw->sdev;
 949
 950         kfree(wqw);
 951         spi_dv_device(sdev);
 952         spi_dv_pending(sdev->sdev_target) = 0;
 953         scsi_device_put(sdev);
 954 }
 955
 956
 957 /**
 958  *      spi_schedule_dv_device - schedule domain validation to occur on the device
 959  *      @sdev:  The device to validate
 960  *
 961  *      Identical to spi_dv_device() above, except that the DV will be
 962  *      scheduled to occur in a workqueue later.  All memory allocations
 963  *      are atomic, so may be called from any context including those holding
 964  *      SCSI locks.
 965  */
 966 void
 967 spi_schedule_dv_device(struct scsi_device *sdev)
 968 {
 969         struct work_queue_wrapper *wqw =
 970                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
 971
 972         if (unlikely(!wqw))
 973                 return;
 974
 975         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
 976                 kfree(wqw);
 977                 return;
 978         }
 979         /* Set pending early (dv_device doesn't check it, only sets it) */
 980         spi_dv_pending(sdev->sdev_target) = 1;
 981         if (unlikely(scsi_device_get(sdev))) {
 982                 kfree(wqw);
 983                 spi_dv_pending(sdev->sdev_target) = 0;
 984                 return;
 985         }
 986
 987         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper, wqw);
 988         wqw->sdev = sdev;
 989
 990         schedule_work(&wqw->work);
 991 }
 992 EXPORT_SYMBOL(spi_schedule_dv_device);
 993
 994 /**
 995  * spi_display_xfer_agreement - Print the current target transfer agreement
 996  * @starget: The target for which to display the agreement
 997  *
 998  * Each SPI port is required to maintain a transfer agreement for each
 999  * other port on the bus.  This function prints a one-line summary of
1000  * the current agreement; more detailed information is available in sysfs.
1001  */
1002 void spi_display_xfer_agreement(struct scsi_target *starget)
1003 {
1004         struct spi_transport_attrs *tp;
1005         tp = (struct spi_transport_attrs *)&starget->starget_data;
1006
1007         if (tp->offset > 0 && tp->period > 0) {
1008                 unsigned int picosec, kb100;
1009                 char *scsi = "FAST-?";
1010                 char tmp[8];
1011
1012                 if (tp->period <= SPI_STATIC_PPR) {
1013                         picosec = ppr_to_ps[tp->period];
1014                         switch (tp->period) {
1015                                 case  7: scsi = "FAST-320"; break;
1016                                 case  8: scsi = "FAST-160"; break;
1017                                 case  9: scsi = "FAST-80"; break;
1018                                 case 10:
1019                                 case 11: scsi = "FAST-40"; break;
1020                                 case 12: scsi = "FAST-20"; break;
1021                         }
1022                 } else {
1023                         picosec = tp->period * 4000;
1024                         if (tp->period < 25)
1025                                 scsi = "FAST-20";
1026                         else if (tp->period < 50)
1027                                 scsi = "FAST-10";
1028                         else
1029                                 scsi = "FAST-5";
1030                 }
1031
1032                 kb100 = (10000000 + picosec / 2) / picosec;
1033                 if (tp->width)
1034                         kb100 *= 2;
1035                 sprint_frac(tmp, picosec, 1000);
1036
1037                 dev_info(&starget->dev,
1038                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1039                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1040                          tp->dt ? "DT" : "ST",
1041                          tp->iu ? " IU" : "",
1042                          tp->qas  ? " QAS" : "",
1043                          tp->rd_strm ? " RDSTRM" : "",
1044                          tp->rti ? " RTI" : "",
1045                          tp->wr_flow ? " WRFLOW" : "",
1046                          tp->pcomp_en ? " PCOMP" : "",
1047                          tp->hold_mcs ? " HMCS" : "",
1048                          tmp, tp->offset);
1049         } else {
1050                 dev_info(&starget->dev, "%sasynchronous.\n",
1051                                 tp->width ? "wide " : "");
1052         }
1053 }
1054 EXPORT_SYMBOL(spi_display_xfer_agreement);
1055
1056 #define SETUP_ATTRIBUTE(field)                                          \
1057         i->private_attrs[count] = class_device_attr_##field;            \
1058         if (!i->f->set_##field) {                                       \
1059                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1060                 i->private_attrs[count].store = NULL;                   \
1061         }                                                               \
1062         i->attrs[count] = &i->private_attrs[count];                     \
1063         if (i->f->show_##field)                                         \
1064                 count++
1065
1066 #define SETUP_RELATED_ATTRIBUTE(field, rel_field)                       \
1067         i->private_attrs[count] = class_device_attr_##field;            \
1068         if (!i->f->set_##rel_field) {                                   \
1069                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1070                 i->private_attrs[count].store = NULL;                   \
1071         }                                                               \
1072         i->attrs[count] = &i->private_attrs[count];                     \
1073         if (i->f->show_##rel_field)                                     \
1074                 count++
1075
1076 #define SETUP_HOST_ATTRIBUTE(field)                                     \
1077         i->private_host_attrs[count] = class_device_attr_##field;       \
1078         if (!i->f->set_##field) {                                       \
1079                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1080                 i->private_host_attrs[count].store = NULL;              \
1081         }                                                               \
1082         i->host_attrs[count] = &i->private_host_attrs[count];           \
1083         count++
1084
1085 static int spi_device_match(struct attribute_container *cont,
1086                             struct device *dev)
1087 {
1088         struct scsi_device *sdev;
1089         struct Scsi_Host *shost;
1090         struct spi_internal *i;
1091
1092         if (!scsi_is_sdev_device(dev))
1093                 return 0;
1094
1095         sdev = to_scsi_device(dev);
1096         shost = sdev->host;
1097         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1098             != &spi_host_class.class)
1099                 return 0;
1100         /* Note: this class has no device attributes, so it has
1101          * no per-HBA allocation and thus we don't need to distinguish
1102          * the attribute containers for the device */
1103         i = to_spi_internal(shost->transportt);
1104         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1105                 return 0;
1106         return 1;
1107 }
1108
1109 static int spi_target_match(struct attribute_container *cont,
1110                             struct device *dev)
1111 {
1112         struct Scsi_Host *shost;
1113         struct scsi_target *starget;
1114         struct spi_internal *i;
1115
1116         if (!scsi_is_target_device(dev))
1117                 return 0;
1118
1119         shost = dev_to_shost(dev->parent);
1120         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1121             != &spi_host_class.class)
1122                 return 0;
1123
1124         i = to_spi_internal(shost->transportt);
1125         starget = to_scsi_target(dev);
1126
1127         if (i->f->deny_binding && i->f->deny_binding(starget))
1128                 return 0;
1129
1130         return &i->t.target_attrs.ac == cont;
1131 }
1132
1133 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1134                                "spi_transport",
1135                                spi_setup_transport_attrs,
1136                                NULL,
1137                                NULL);
1138
1139 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1140                                     spi_device_match,
1141                                     spi_device_configure);
1142
1143 struct scsi_transport_template *
1144 spi_attach_transport(struct spi_function_template *ft)
1145 {
1146         struct spi_internal *i = kmalloc(sizeof(struct spi_internal),
1147                                          GFP_KERNEL);
1148         int count = 0;
1149         if (unlikely(!i))
1150                 return NULL;
1151
1152         memset(i, 0, sizeof(struct spi_internal));
1153
1154
1155         i->t.target_attrs.ac.class = &spi_transport_class.class;
1156         i->t.target_attrs.ac.attrs = &i->attrs[0];
1157         i->t.target_attrs.ac.match = spi_target_match;
1158         transport_container_register(&i->t.target_attrs);
1159         i->t.target_size = sizeof(struct spi_transport_attrs);
1160         i->t.host_attrs.ac.class = &spi_host_class.class;
1161         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1162         i->t.host_attrs.ac.match = spi_host_match;
1163         transport_container_register(&i->t.host_attrs);
1164         i->t.host_size = sizeof(struct spi_host_attrs);
1165         i->f = ft;
1166
1167         SETUP_ATTRIBUTE(period);
1168         SETUP_RELATED_ATTRIBUTE(min_period, period);
1169         SETUP_ATTRIBUTE(offset);
1170         SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1171         SETUP_ATTRIBUTE(width);
1172         SETUP_RELATED_ATTRIBUTE(max_width, width);
1173         SETUP_ATTRIBUTE(iu);
1174         SETUP_ATTRIBUTE(dt);
1175         SETUP_ATTRIBUTE(qas);
1176         SETUP_ATTRIBUTE(wr_flow);
1177         SETUP_ATTRIBUTE(rd_strm);
1178         SETUP_ATTRIBUTE(rti);
1179         SETUP_ATTRIBUTE(pcomp_en);
1180         SETUP_ATTRIBUTE(hold_mcs);
1181
1182         /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1183          * this bug will trigger */
1184         BUG_ON(count > SPI_NUM_ATTRS);
1185
1186         i->attrs[count++] = &class_device_attr_revalidate;
1187
1188         i->attrs[count] = NULL;
1189
1190         count = 0;
1191         SETUP_HOST_ATTRIBUTE(signalling);
1192
1193         BUG_ON(count > SPI_HOST_ATTRS);
1194
1195         i->host_attrs[count] = NULL;
1196
1197         return &i->t;
1198 }
1199 EXPORT_SYMBOL(spi_attach_transport);
1200
1201 void spi_release_transport(struct scsi_transport_template *t)
1202 {
1203         struct spi_internal *i = to_spi_internal(t);
1204
1205         transport_container_unregister(&i->t.target_attrs);
1206         transport_container_unregister(&i->t.host_attrs);
1207
1208         kfree(i);
1209 }
1210 EXPORT_SYMBOL(spi_release_transport);
1211
1212 static __init int spi_transport_init(void)
1213 {
1214         int error = transport_class_register(&spi_transport_class);
1215         if (error)
1216                 return error;
1217         error = anon_transport_class_register(&spi_device_class);
1218         return transport_class_register(&spi_host_class);
1219 }
1220
1221 static void __exit spi_transport_exit(void)
1222 {
1223         transport_class_unregister(&spi_transport_class);
1224         anon_transport_class_unregister(&spi_device_class);
1225         transport_class_unregister(&spi_host_class);
1226 }
1227
1228 MODULE_AUTHOR("Martin Hicks");
1229 MODULE_DESCRIPTION("SPI Transport Attributes");
1230 MODULE_LICENSE("GPL");
1231
1232 module_init(spi_transport_init);
1233 module_exit(spi_transport_exit);