drivers/scsi/ses.c

   1 /*
   2  * SCSI Enclosure Services
   3  *
   4  * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
   5  *
   6 **-----------------------------------------------------------------------------
   7 **
   8 **  This program is free software; you can redistribute it and/or
   9 **  modify it under the terms of the GNU General Public License
  10 **  version 2 as published by the Free Software Foundation.
  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., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 **
  21 **-----------------------------------------------------------------------------
  22 */
  23
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/enclosure.h>
  27
  28 #include <scsi/scsi.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <scsi/scsi_dbg.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_driver.h>
  33 #include <scsi/scsi_host.h>
  34
  35 struct ses_device {
  36         unsigned char *page1;
  37         unsigned char *page2;
  38         unsigned char *page10;
  39         short page1_len;
  40         short page2_len;
  41         short page10_len;
  42 };
  43
  44 struct ses_component {
  45         u64 addr;
  46         unsigned char *desc;
  47 };
  48
  49 static int ses_probe(struct device *dev)
  50 {
  51         struct scsi_device *sdev = to_scsi_device(dev);
  52         int err = -ENODEV;
  53
  54         if (sdev->type != TYPE_ENCLOSURE)
  55                 goto out;
  56
  57         err = 0;
  58         sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
  59
  60  out:
  61         return err;
  62 }
  63
  64 #define SES_TIMEOUT 30
  65 #define SES_RETRIES 3
  66
  67 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
  68                          void *buf, int bufflen)
  69 {
  70         unsigned char cmd[] = {
  71                 RECEIVE_DIAGNOSTIC,
  72                 1,              /* Set PCV bit */
  73                 page_code,
  74                 bufflen >> 8,
  75                 bufflen & 0xff,
  76                 0
  77         };
  78
  79         return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
  80                                 NULL, SES_TIMEOUT, SES_RETRIES);
  81 }
  82
  83 static int ses_send_diag(struct scsi_device *sdev, int page_code,
  84                          void *buf, int bufflen)
  85 {
  86         u32 result;
  87
  88         unsigned char cmd[] = {
  89                 SEND_DIAGNOSTIC,
  90                 0x10,           /* Set PF bit */
  91                 0,
  92                 bufflen >> 8,
  93                 bufflen & 0xff,
  94                 0
  95         };
  96
  97         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
  98                                   NULL, SES_TIMEOUT, SES_RETRIES);
  99         if (result)
 100                 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
 101                             result);
 102         return result;
 103 }
 104
 105 static int ses_set_page2_descriptor(struct enclosure_device *edev,
 106                                       struct enclosure_component *ecomp,
 107                                       unsigned char *desc)
 108 {
 109         int i, j, count = 0, descriptor = ecomp->number;
 110         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 111         struct ses_device *ses_dev = edev->scratch;
 112         unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
 113         unsigned char *desc_ptr = ses_dev->page2 + 8;
 114
 115         /* Clear everything */
 116         memset(desc_ptr, 0, ses_dev->page2_len - 8);
 117         for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
 118                 for (j = 0; j < type_ptr[1]; j++) {
 119                         desc_ptr += 4;
 120                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 121                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 122                                 continue;
 123                         if (count++ == descriptor) {
 124                                 memcpy(desc_ptr, desc, 4);
 125                                 /* set select */
 126                                 desc_ptr[0] |= 0x80;
 127                                 /* clear reserved, just in case */
 128                                 desc_ptr[0] &= 0xf0;
 129                         }
 130                 }
 131         }
 132
 133         return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 134 }
 135
 136 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
 137                                       struct enclosure_component *ecomp)
 138 {
 139         int i, j, count = 0, descriptor = ecomp->number;
 140         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 141         struct ses_device *ses_dev = edev->scratch;
 142         unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
 143         unsigned char *desc_ptr = ses_dev->page2 + 8;
 144
 145         ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 146
 147         for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
 148                 for (j = 0; j < type_ptr[1]; j++) {
 149                         desc_ptr += 4;
 150                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 151                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 152                                 continue;
 153                         if (count++ == descriptor)
 154                                 return desc_ptr;
 155                 }
 156         }
 157         return NULL;
 158 }
 159
 160 static void ses_get_fault(struct enclosure_device *edev,
 161                           struct enclosure_component *ecomp)
 162 {
 163         unsigned char *desc;
 164
 165         desc = ses_get_page2_descriptor(edev, ecomp);
 166         if (desc)
 167                 ecomp->fault = (desc[3] & 0x60) >> 4;
 168 }
 169
 170 static int ses_set_fault(struct enclosure_device *edev,
 171                           struct enclosure_component *ecomp,
 172                          enum enclosure_component_setting val)
 173 {
 174         unsigned char desc[4] = {0 };
 175
 176         switch (val) {
 177         case ENCLOSURE_SETTING_DISABLED:
 178                 /* zero is disabled */
 179                 break;
 180         case ENCLOSURE_SETTING_ENABLED:
 181                 desc[2] = 0x02;
 182                 break;
 183         default:
 184                 /* SES doesn't do the SGPIO blink settings */
 185                 return -EINVAL;
 186         }
 187
 188         return ses_set_page2_descriptor(edev, ecomp, desc);
 189 }
 190
 191 static void ses_get_status(struct enclosure_device *edev,
 192                            struct enclosure_component *ecomp)
 193 {
 194         unsigned char *desc;
 195
 196         desc = ses_get_page2_descriptor(edev, ecomp);
 197         if (desc)
 198                 ecomp->status = (desc[0] & 0x0f);
 199 }
 200
 201 static void ses_get_locate(struct enclosure_device *edev,
 202                            struct enclosure_component *ecomp)
 203 {
 204         unsigned char *desc;
 205
 206         desc = ses_get_page2_descriptor(edev, ecomp);
 207         if (desc)
 208                 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
 209 }
 210
 211 static int ses_set_locate(struct enclosure_device *edev,
 212                           struct enclosure_component *ecomp,
 213                           enum enclosure_component_setting val)
 214 {
 215         unsigned char desc[4] = {0 };
 216
 217         switch (val) {
 218         case ENCLOSURE_SETTING_DISABLED:
 219                 /* zero is disabled */
 220                 break;
 221         case ENCLOSURE_SETTING_ENABLED:
 222                 desc[2] = 0x02;
 223                 break;
 224         default:
 225                 /* SES doesn't do the SGPIO blink settings */
 226                 return -EINVAL;
 227         }
 228         return ses_set_page2_descriptor(edev, ecomp, desc);
 229 }
 230
 231 static int ses_set_active(struct enclosure_device *edev,
 232                           struct enclosure_component *ecomp,
 233                           enum enclosure_component_setting val)
 234 {
 235         unsigned char desc[4] = {0 };
 236
 237         switch (val) {
 238         case ENCLOSURE_SETTING_DISABLED:
 239                 /* zero is disabled */
 240                 ecomp->active = 0;
 241                 break;
 242         case ENCLOSURE_SETTING_ENABLED:
 243                 desc[2] = 0x80;
 244                 ecomp->active = 1;
 245                 break;
 246         default:
 247                 /* SES doesn't do the SGPIO blink settings */
 248                 return -EINVAL;
 249         }
 250         return ses_set_page2_descriptor(edev, ecomp, desc);
 251 }
 252
 253 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
 254         .get_fault              = ses_get_fault,
 255         .set_fault              = ses_set_fault,
 256         .get_status             = ses_get_status,
 257         .get_locate             = ses_get_locate,
 258         .set_locate             = ses_set_locate,
 259         .set_active             = ses_set_active,
 260 };
 261
 262 struct ses_host_edev {
 263         struct Scsi_Host *shost;
 264         struct enclosure_device *edev;
 265 };
 266
 267 int ses_match_host(struct enclosure_device *edev, void *data)
 268 {
 269         struct ses_host_edev *sed = data;
 270         struct scsi_device *sdev;
 271
 272         if (!scsi_is_sdev_device(edev->edev.parent))
 273                 return 0;
 274
 275         sdev = to_scsi_device(edev->edev.parent);
 276
 277         if (sdev->host != sed->shost)
 278                 return 0;
 279
 280         sed->edev = edev;
 281         return 1;
 282 }
 283
 284 static void ses_process_descriptor(struct enclosure_component *ecomp,
 285                                    unsigned char *desc)
 286 {
 287         int eip = desc[0] & 0x10;
 288         int invalid = desc[0] & 0x80;
 289         enum scsi_protocol proto = desc[0] & 0x0f;
 290         u64 addr = 0;
 291         struct ses_component *scomp = ecomp->scratch;
 292         unsigned char *d;
 293
 294         scomp->desc = desc;
 295
 296         if (invalid)
 297                 return;
 298
 299         switch (proto) {
 300         case SCSI_PROTOCOL_SAS:
 301                 if (eip)
 302                         d = desc + 8;
 303                 else
 304                         d = desc + 4;
 305                 /* only take the phy0 addr */
 306                 addr = (u64)d[12] << 56 |
 307                         (u64)d[13] << 48 |
 308                         (u64)d[14] << 40 |
 309                         (u64)d[15] << 32 |
 310                         (u64)d[16] << 24 |
 311                         (u64)d[17] << 16 |
 312                         (u64)d[18] << 8 |
 313                         (u64)d[19];
 314                 break;
 315         default:
 316                 /* FIXME: Need to add more protocols than just SAS */
 317                 break;
 318         }
 319         scomp->addr = addr;
 320 }
 321
 322 struct efd {
 323         u64 addr;
 324         struct device *dev;
 325 };
 326
 327 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
 328                                       void *data)
 329 {
 330         struct efd *efd = data;
 331         int i;
 332         struct ses_component *scomp;
 333
 334         if (!edev->component[0].scratch)
 335                 return 0;
 336
 337         for (i = 0; i < edev->components; i++) {
 338                 scomp = edev->component[i].scratch;
 339                 if (scomp->addr != efd->addr)
 340                         continue;
 341
 342                 enclosure_add_device(edev, i, efd->dev);
 343                 return 1;
 344         }
 345         return 0;
 346 }
 347
 348 #define VPD_INQUIRY_SIZE 512
 349
 350 static void ses_match_to_enclosure(struct enclosure_device *edev,
 351                                    struct scsi_device *sdev)
 352 {
 353         unsigned char *buf = kmalloc(VPD_INQUIRY_SIZE, GFP_KERNEL);
 354         unsigned char *desc;
 355         int len;
 356         struct efd efd = {
 357                 .addr = 0,
 358         };
 359         unsigned char cmd[] = {
 360                 INQUIRY,
 361                 1,
 362                 0x83,
 363                 VPD_INQUIRY_SIZE >> 8,
 364                 VPD_INQUIRY_SIZE & 0xff,
 365                 0
 366         };
 367
 368         if (!buf)
 369                 return;
 370
 371         if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
 372                              VPD_INQUIRY_SIZE, NULL, SES_TIMEOUT, SES_RETRIES))
 373                 goto free;
 374
 375         len = (buf[2] << 8) + buf[3];
 376         desc = buf + 4;
 377         while (desc < buf + len) {
 378                 enum scsi_protocol proto = desc[0] >> 4;
 379                 u8 code_set = desc[0] & 0x0f;
 380                 u8 piv = desc[1] & 0x80;
 381                 u8 assoc = (desc[1] & 0x30) >> 4;
 382                 u8 type = desc[1] & 0x0f;
 383                 u8 len = desc[3];
 384
 385                 if (piv && code_set == 1 && assoc == 1 && code_set == 1
 386                     && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
 387                         efd.addr = (u64)desc[4] << 56 |
 388                                 (u64)desc[5] << 48 |
 389                                 (u64)desc[6] << 40 |
 390                                 (u64)desc[7] << 32 |
 391                                 (u64)desc[8] << 24 |
 392                                 (u64)desc[9] << 16 |
 393                                 (u64)desc[10] << 8 |
 394                                 (u64)desc[11];
 395
 396                 desc += len + 4;
 397         }
 398         if (!efd.addr)
 399                 goto free;
 400
 401         efd.dev = &sdev->sdev_gendev;
 402
 403         enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
 404  free:
 405         kfree(buf);
 406 }
 407
 408 #define INIT_ALLOC_SIZE 32
 409
 410 static int ses_intf_add(struct device *cdev,
 411                         struct class_interface *intf)
 412 {
 413         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 414         struct scsi_device *tmp_sdev;
 415         unsigned char *buf = NULL, *hdr_buf, *type_ptr, *desc_ptr = NULL,
 416                 *addl_desc_ptr = NULL;
 417         struct ses_device *ses_dev;
 418         u32 result;
 419         int i, j, types, len, page7_len = 0, components = 0;
 420         int err = -ENOMEM;
 421         struct enclosure_device *edev;
 422         struct ses_component *scomp = NULL;
 423
 424         if (!scsi_device_enclosure(sdev)) {
 425                 /* not an enclosure, but might be in one */
 426                 edev = enclosure_find(&sdev->host->shost_gendev);
 427                 if (edev) {
 428                         ses_match_to_enclosure(edev, sdev);
 429                         put_device(&edev->edev);
 430                 }
 431                 return -ENODEV;
 432         }
 433
 434         /* TYPE_ENCLOSURE prints a message in probe */
 435         if (sdev->type != TYPE_ENCLOSURE)
 436                 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
 437
 438         ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
 439         hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 440         if (!hdr_buf || !ses_dev)
 441                 goto err_init_free;
 442
 443         result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
 444         if (result)
 445                 goto recv_failed;
 446
 447         if (hdr_buf[1] != 0) {
 448                 /* FIXME: need subenclosure support; I've just never
 449                  * seen a device with subenclosures and it makes the
 450                  * traversal routines more complex */
 451                 sdev_printk(KERN_ERR, sdev,
 452                         "FIXME driver has no support for subenclosures (%d)\n",
 453                         hdr_buf[1]);
 454                 goto err_free;
 455         }
 456
 457         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 458         buf = kzalloc(len, GFP_KERNEL);
 459         if (!buf)
 460                 goto err_free;
 461
 462         result = ses_recv_diag(sdev, 1, buf, len);
 463         if (result)
 464                 goto recv_failed;
 465
 466         types = buf[10];
 467
 468         type_ptr = buf + 12 + buf[11];
 469
 470         for (i = 0; i < types; i++, type_ptr += 4) {
 471                 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 472                     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 473                         components += type_ptr[1];
 474         }
 475         ses_dev->page1 = buf;
 476         ses_dev->page1_len = len;
 477         buf = NULL;
 478
 479         result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
 480         if (result)
 481                 goto recv_failed;
 482
 483         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 484         buf = kzalloc(len, GFP_KERNEL);
 485         if (!buf)
 486                 goto err_free;
 487
 488         /* make sure getting page 2 actually works */
 489         result = ses_recv_diag(sdev, 2, buf, len);
 490         if (result)
 491                 goto recv_failed;
 492         ses_dev->page2 = buf;
 493         ses_dev->page2_len = len;
 494         buf = NULL;
 495
 496         /* The additional information page --- allows us
 497          * to match up the devices */
 498         result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
 499         if (!result) {
 500
 501                 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 502                 buf = kzalloc(len, GFP_KERNEL);
 503                 if (!buf)
 504                         goto err_free;
 505
 506                 result = ses_recv_diag(sdev, 10, buf, len);
 507                 if (result)
 508                         goto recv_failed;
 509                 ses_dev->page10 = buf;
 510                 ses_dev->page10_len = len;
 511                 buf = NULL;
 512         }
 513
 514         scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
 515         if (!scomp)
 516                 goto err_free;
 517
 518         edev = enclosure_register(cdev->parent, sdev->sdev_gendev.bus_id,
 519                                   components, &ses_enclosure_callbacks);
 520         if (IS_ERR(edev)) {
 521                 err = PTR_ERR(edev);
 522                 goto err_free;
 523         }
 524
 525         edev->scratch = ses_dev;
 526         for (i = 0; i < components; i++)
 527                 edev->component[i].scratch = scomp + i;
 528
 529         /* Page 7 for the descriptors is optional */
 530         result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
 531         if (result)
 532                 goto simple_populate;
 533
 534         page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 535         /* add 1 for trailing '\0' we'll use */
 536         buf = kzalloc(len + 1, GFP_KERNEL);
 537         if (!buf)
 538                 goto simple_populate;
 539         result = ses_recv_diag(sdev, 7, buf, len);
 540         if (result) {
 541  simple_populate:
 542                 kfree(buf);
 543                 buf = NULL;
 544                 desc_ptr = NULL;
 545                 addl_desc_ptr = NULL;
 546         } else {
 547                 desc_ptr = buf + 8;
 548                 len = (desc_ptr[2] << 8) + desc_ptr[3];
 549                 /* skip past overall descriptor */
 550                 desc_ptr += len + 4;
 551                 if (ses_dev->page10)
 552                         addl_desc_ptr = ses_dev->page10 + 8;
 553         }
 554         type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
 555         components = 0;
 556         for (i = 0; i < types; i++, type_ptr += 4) {
 557                 for (j = 0; j < type_ptr[1]; j++) {
 558                         char *name = NULL;
 559                         struct enclosure_component *ecomp;
 560
 561                         if (desc_ptr) {
 562                                 if (desc_ptr >= buf + page7_len) {
 563                                         desc_ptr = NULL;
 564                                 } else {
 565                                         len = (desc_ptr[2] << 8) + desc_ptr[3];
 566                                         desc_ptr += 4;
 567                                         /* Add trailing zero - pushes into
 568                                          * reserved space */
 569                                         desc_ptr[len] = '\0';
 570                                         name = desc_ptr;
 571                                 }
 572                         }
 573                         if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 574                             type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
 575
 576                                 ecomp = enclosure_component_register(edev,
 577                                                              components++,
 578                                                              type_ptr[0],
 579                                                              name);
 580
 581                                 if (!IS_ERR(ecomp) && addl_desc_ptr)
 582                                         ses_process_descriptor(ecomp,
 583                                                                addl_desc_ptr);
 584                         }
 585                         if (desc_ptr)
 586                                 desc_ptr += len;
 587
 588                         if (addl_desc_ptr)
 589                                 addl_desc_ptr += addl_desc_ptr[1] + 2;
 590
 591                 }
 592         }
 593         kfree(buf);
 594         kfree(hdr_buf);
 595
 596         /* see if there are any devices matching before
 597          * we found the enclosure */
 598         shost_for_each_device(tmp_sdev, sdev->host) {
 599                 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
 600                         continue;
 601                 ses_match_to_enclosure(edev, tmp_sdev);
 602         }
 603
 604         return 0;
 605
 606  recv_failed:
 607         sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
 608                     result);
 609         err = -ENODEV;
 610  err_free:
 611         kfree(buf);
 612         kfree(scomp);
 613         kfree(ses_dev->page10);
 614         kfree(ses_dev->page2);
 615         kfree(ses_dev->page1);
 616  err_init_free:
 617         kfree(ses_dev);
 618         kfree(hdr_buf);
 619         sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
 620         return err;
 621 }
 622
 623 static int ses_remove(struct device *dev)
 624 {
 625         return 0;
 626 }
 627
 628 static void ses_intf_remove(struct device *cdev,
 629                             struct class_interface *intf)
 630 {
 631         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 632         struct enclosure_device *edev;
 633         struct ses_device *ses_dev;
 634
 635         if (!scsi_device_enclosure(sdev))
 636                 return;
 637
 638         edev = enclosure_find(cdev->parent);
 639         if (!edev)
 640                 return;
 641
 642         ses_dev = edev->scratch;
 643         edev->scratch = NULL;
 644
 645         kfree(ses_dev->page10);
 646         kfree(ses_dev->page1);
 647         kfree(ses_dev->page2);
 648         kfree(ses_dev);
 649
 650         kfree(edev->component[0].scratch);
 651
 652         put_device(&edev->edev);
 653         enclosure_unregister(edev);
 654 }
 655
 656 static struct class_interface ses_interface = {
 657         .add_dev        = ses_intf_add,
 658         .remove_dev     = ses_intf_remove,
 659 };
 660
 661 static struct scsi_driver ses_template = {
 662         .owner                  = THIS_MODULE,
 663         .gendrv = {
 664                 .name           = "ses",
 665                 .probe          = ses_probe,
 666                 .remove         = ses_remove,
 667         },
 668 };
 669
 670 static int __init ses_init(void)
 671 {
 672         int err;
 673
 674         err = scsi_register_interface(&ses_interface);
 675         if (err)
 676                 return err;
 677
 678         err = scsi_register_driver(&ses_template.gendrv);
 679         if (err)
 680                 goto out_unreg;
 681
 682         return 0;
 683
 684  out_unreg:
 685         scsi_unregister_interface(&ses_interface);
 686         return err;
 687 }
 688
 689 static void __exit ses_exit(void)
 690 {
 691         scsi_unregister_driver(&ses_template.gendrv);
 692         scsi_unregister_interface(&ses_interface);
 693 }
 694
 695 module_init(ses_init);
 696 module_exit(ses_exit);
 697
 698 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
 699
 700 MODULE_AUTHOR("James Bottomley");
 701 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
 702 MODULE_LICENSE("GPL v2");