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/slab.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/enclosure.h>
  28 #include <asm/unaligned.h>
  29
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_cmnd.h>
  32 #include <scsi/scsi_dbg.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_driver.h>
  35 #include <scsi/scsi_host.h>
  36
  37 #include <scsi/scsi_transport_sas.h>
  38
  39 struct ses_device {
  40         unsigned char *page1;
  41         unsigned char *page1_types;
  42         unsigned char *page2;
  43         unsigned char *page10;
  44         short page1_len;
  45         short page1_num_types;
  46         short page2_len;
  47         short page10_len;
  48 };
  49
  50 struct ses_component {
  51         u64 addr;
  52 };
  53
  54 static int ses_probe(struct device *dev)
  55 {
  56         struct scsi_device *sdev = to_scsi_device(dev);
  57         int err = -ENODEV;
  58
  59         if (sdev->type != TYPE_ENCLOSURE)
  60                 goto out;
  61
  62         err = 0;
  63         sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
  64
  65  out:
  66         return err;
  67 }
  68
  69 #define SES_TIMEOUT (30 * HZ)
  70 #define SES_RETRIES 3
  71
  72 static void init_device_slot_control(unsigned char *dest_desc,
  73                                      struct enclosure_component *ecomp,
  74                                      unsigned char *status)
  75 {
  76         memcpy(dest_desc, status, 4);
  77         dest_desc[0] = 0;
  78         /* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
  79         if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
  80                 dest_desc[1] = 0;
  81         dest_desc[2] &= 0xde;
  82         dest_desc[3] &= 0x3c;
  83 }
  84
  85
  86 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
  87                          void *buf, int bufflen)
  88 {
  89         int ret;
  90         unsigned char cmd[] = {
  91                 RECEIVE_DIAGNOSTIC,
  92                 1,              /* Set PCV bit */
  93                 page_code,
  94                 bufflen >> 8,
  95                 bufflen & 0xff,
  96                 0
  97         };
  98         unsigned char recv_page_code;
  99
 100         ret =  scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
 101                                 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
 102         if (unlikely(!ret))
 103                 return ret;
 104
 105         recv_page_code = ((unsigned char *)buf)[0];
 106
 107         if (likely(recv_page_code == page_code))
 108                 return ret;
 109
 110         /* successful diagnostic but wrong page code.  This happens to some
 111          * USB devices, just print a message and pretend there was an error */
 112
 113         sdev_printk(KERN_ERR, sdev,
 114                     "Wrong diagnostic page; asked for %d got %u\n",
 115                     page_code, recv_page_code);
 116
 117         return -EINVAL;
 118 }
 119
 120 static int ses_send_diag(struct scsi_device *sdev, int page_code,
 121                          void *buf, int bufflen)
 122 {
 123         u32 result;
 124
 125         unsigned char cmd[] = {
 126                 SEND_DIAGNOSTIC,
 127                 0x10,           /* Set PF bit */
 128                 0,
 129                 bufflen >> 8,
 130                 bufflen & 0xff,
 131                 0
 132         };
 133
 134         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
 135                                   NULL, SES_TIMEOUT, SES_RETRIES, NULL);
 136         if (result)
 137                 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
 138                             result);
 139         return result;
 140 }
 141
 142 static int ses_set_page2_descriptor(struct enclosure_device *edev,
 143                                       struct enclosure_component *ecomp,
 144                                       unsigned char *desc)
 145 {
 146         int i, j, count = 0, descriptor = ecomp->number;
 147         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 148         struct ses_device *ses_dev = edev->scratch;
 149         unsigned char *type_ptr = ses_dev->page1_types;
 150         unsigned char *desc_ptr = ses_dev->page2 + 8;
 151
 152         /* Clear everything */
 153         memset(desc_ptr, 0, ses_dev->page2_len - 8);
 154         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 155                 for (j = 0; j < type_ptr[1]; j++) {
 156                         desc_ptr += 4;
 157                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 158                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 159                                 continue;
 160                         if (count++ == descriptor) {
 161                                 memcpy(desc_ptr, desc, 4);
 162                                 /* set select */
 163                                 desc_ptr[0] |= 0x80;
 164                                 /* clear reserved, just in case */
 165                                 desc_ptr[0] &= 0xf0;
 166                         }
 167                 }
 168         }
 169
 170         return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 171 }
 172
 173 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
 174                                       struct enclosure_component *ecomp)
 175 {
 176         int i, j, count = 0, descriptor = ecomp->number;
 177         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 178         struct ses_device *ses_dev = edev->scratch;
 179         unsigned char *type_ptr = ses_dev->page1_types;
 180         unsigned char *desc_ptr = ses_dev->page2 + 8;
 181
 182         ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 183
 184         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 185                 for (j = 0; j < type_ptr[1]; j++) {
 186                         desc_ptr += 4;
 187                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 188                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 189                                 continue;
 190                         if (count++ == descriptor)
 191                                 return desc_ptr;
 192                 }
 193         }
 194         return NULL;
 195 }
 196
 197 /* For device slot and array device slot elements, byte 3 bit 6
 198  * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
 199  * code stands these bits are shifted 4 positions right so in
 200  * sysfs they will appear as bits 2 and 1 respectively. Strange. */
 201 static void ses_get_fault(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->fault = (desc[3] & 0x60) >> 4;
 209 }
 210
 211 static int ses_set_fault(struct enclosure_device *edev,
 212                           struct enclosure_component *ecomp,
 213                          enum enclosure_component_setting val)
 214 {
 215         unsigned char desc[4];
 216         unsigned char *desc_ptr;
 217
 218         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 219
 220         if (!desc_ptr)
 221                 return -EIO;
 222
 223         init_device_slot_control(desc, ecomp, desc_ptr);
 224
 225         switch (val) {
 226         case ENCLOSURE_SETTING_DISABLED:
 227                 desc[3] &= 0xdf;
 228                 break;
 229         case ENCLOSURE_SETTING_ENABLED:
 230                 desc[3] |= 0x20;
 231                 break;
 232         default:
 233                 /* SES doesn't do the SGPIO blink settings */
 234                 return -EINVAL;
 235         }
 236
 237         return ses_set_page2_descriptor(edev, ecomp, desc);
 238 }
 239
 240 static void ses_get_status(struct enclosure_device *edev,
 241                            struct enclosure_component *ecomp)
 242 {
 243         unsigned char *desc;
 244
 245         desc = ses_get_page2_descriptor(edev, ecomp);
 246         if (desc)
 247                 ecomp->status = (desc[0] & 0x0f);
 248 }
 249
 250 static void ses_get_locate(struct enclosure_device *edev,
 251                            struct enclosure_component *ecomp)
 252 {
 253         unsigned char *desc;
 254
 255         desc = ses_get_page2_descriptor(edev, ecomp);
 256         if (desc)
 257                 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
 258 }
 259
 260 static int ses_set_locate(struct enclosure_device *edev,
 261                           struct enclosure_component *ecomp,
 262                           enum enclosure_component_setting val)
 263 {
 264         unsigned char desc[4];
 265         unsigned char *desc_ptr;
 266
 267         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 268
 269         if (!desc_ptr)
 270                 return -EIO;
 271
 272         init_device_slot_control(desc, ecomp, desc_ptr);
 273
 274         switch (val) {
 275         case ENCLOSURE_SETTING_DISABLED:
 276                 desc[2] &= 0xfd;
 277                 break;
 278         case ENCLOSURE_SETTING_ENABLED:
 279                 desc[2] |= 0x02;
 280                 break;
 281         default:
 282                 /* SES doesn't do the SGPIO blink settings */
 283                 return -EINVAL;
 284         }
 285         return ses_set_page2_descriptor(edev, ecomp, desc);
 286 }
 287
 288 static int ses_set_active(struct enclosure_device *edev,
 289                           struct enclosure_component *ecomp,
 290                           enum enclosure_component_setting val)
 291 {
 292         unsigned char desc[4];
 293         unsigned char *desc_ptr;
 294
 295         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 296
 297         if (!desc_ptr)
 298                 return -EIO;
 299
 300         init_device_slot_control(desc, ecomp, desc_ptr);
 301
 302         switch (val) {
 303         case ENCLOSURE_SETTING_DISABLED:
 304                 desc[2] &= 0x7f;
 305                 ecomp->active = 0;
 306                 break;
 307         case ENCLOSURE_SETTING_ENABLED:
 308                 desc[2] |= 0x80;
 309                 ecomp->active = 1;
 310                 break;
 311         default:
 312                 /* SES doesn't do the SGPIO blink settings */
 313                 return -EINVAL;
 314         }
 315         return ses_set_page2_descriptor(edev, ecomp, desc);
 316 }
 317
 318 static int ses_show_id(struct enclosure_device *edev, char *buf)
 319 {
 320         struct ses_device *ses_dev = edev->scratch;
 321         unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
 322
 323         return sprintf(buf, "%#llx\n", id);
 324 }
 325
 326 static void ses_get_power_status(struct enclosure_device *edev,
 327                                  struct enclosure_component *ecomp)
 328 {
 329         unsigned char *desc;
 330
 331         desc = ses_get_page2_descriptor(edev, ecomp);
 332         if (desc)
 333                 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
 334 }
 335
 336 static int ses_set_power_status(struct enclosure_device *edev,
 337                                 struct enclosure_component *ecomp,
 338                                 int val)
 339 {
 340         unsigned char desc[4];
 341         unsigned char *desc_ptr;
 342
 343         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 344
 345         if (!desc_ptr)
 346                 return -EIO;
 347
 348         init_device_slot_control(desc, ecomp, desc_ptr);
 349
 350         switch (val) {
 351         /* power = 1 is device_off = 0 and vice versa */
 352         case 0:
 353                 desc[3] |= 0x10;
 354                 break;
 355         case 1:
 356                 desc[3] &= 0xef;
 357                 break;
 358         default:
 359                 return -EINVAL;
 360         }
 361         ecomp->power_status = val;
 362         return ses_set_page2_descriptor(edev, ecomp, desc);
 363 }
 364
 365 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
 366         .get_fault              = ses_get_fault,
 367         .set_fault              = ses_set_fault,
 368         .get_status             = ses_get_status,
 369         .get_locate             = ses_get_locate,
 370         .set_locate             = ses_set_locate,
 371         .get_power_status       = ses_get_power_status,
 372         .set_power_status       = ses_set_power_status,
 373         .set_active             = ses_set_active,
 374         .show_id                = ses_show_id,
 375 };
 376
 377 struct ses_host_edev {
 378         struct Scsi_Host *shost;
 379         struct enclosure_device *edev;
 380 };
 381
 382 #if 0
 383 int ses_match_host(struct enclosure_device *edev, void *data)
 384 {
 385         struct ses_host_edev *sed = data;
 386         struct scsi_device *sdev;
 387
 388         if (!scsi_is_sdev_device(edev->edev.parent))
 389                 return 0;
 390
 391         sdev = to_scsi_device(edev->edev.parent);
 392
 393         if (sdev->host != sed->shost)
 394                 return 0;
 395
 396         sed->edev = edev;
 397         return 1;
 398 }
 399 #endif  /*  0  */
 400
 401 static void ses_process_descriptor(struct enclosure_component *ecomp,
 402                                    unsigned char *desc)
 403 {
 404         int eip = desc[0] & 0x10;
 405         int invalid = desc[0] & 0x80;
 406         enum scsi_protocol proto = desc[0] & 0x0f;
 407         u64 addr = 0;
 408         int slot = -1;
 409         struct ses_component *scomp = ecomp->scratch;
 410         unsigned char *d;
 411
 412         if (invalid)
 413                 return;
 414
 415         switch (proto) {
 416         case SCSI_PROTOCOL_FCP:
 417                 if (eip) {
 418                         d = desc + 4;
 419                         slot = d[3];
 420                 }
 421                 break;
 422         case SCSI_PROTOCOL_SAS:
 423                 if (eip) {
 424                         d = desc + 4;
 425                         slot = d[3];
 426                         d = desc + 8;
 427                 } else
 428                         d = desc + 4;
 429                 /* only take the phy0 addr */
 430                 addr = (u64)d[12] << 56 |
 431                         (u64)d[13] << 48 |
 432                         (u64)d[14] << 40 |
 433                         (u64)d[15] << 32 |
 434                         (u64)d[16] << 24 |
 435                         (u64)d[17] << 16 |
 436                         (u64)d[18] << 8 |
 437                         (u64)d[19];
 438                 break;
 439         default:
 440                 /* FIXME: Need to add more protocols than just SAS */
 441                 break;
 442         }
 443         ecomp->slot = slot;
 444         scomp->addr = addr;
 445 }
 446
 447 struct efd {
 448         u64 addr;
 449         struct device *dev;
 450 };
 451
 452 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
 453                                       void *data)
 454 {
 455         struct efd *efd = data;
 456         int i;
 457         struct ses_component *scomp;
 458
 459         if (!edev->component[0].scratch)
 460                 return 0;
 461
 462         for (i = 0; i < edev->components; i++) {
 463                 scomp = edev->component[i].scratch;
 464                 if (scomp->addr != efd->addr)
 465                         continue;
 466
 467                 if (enclosure_add_device(edev, i, efd->dev) == 0)
 468                         kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
 469                 return 1;
 470         }
 471         return 0;
 472 }
 473
 474 #define INIT_ALLOC_SIZE 32
 475
 476 static void ses_enclosure_data_process(struct enclosure_device *edev,
 477                                        struct scsi_device *sdev,
 478                                        int create)
 479 {
 480         u32 result;
 481         unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
 482         int i, j, page7_len, len, components;
 483         struct ses_device *ses_dev = edev->scratch;
 484         int types = ses_dev->page1_num_types;
 485         unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 486
 487         if (!hdr_buf)
 488                 goto simple_populate;
 489
 490         /* re-read page 10 */
 491         if (ses_dev->page10)
 492                 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
 493         /* Page 7 for the descriptors is optional */
 494         result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
 495         if (result)
 496                 goto simple_populate;
 497
 498         page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 499         /* add 1 for trailing '\0' we'll use */
 500         buf = kzalloc(len + 1, GFP_KERNEL);
 501         if (!buf)
 502                 goto simple_populate;
 503         result = ses_recv_diag(sdev, 7, buf, len);
 504         if (result) {
 505  simple_populate:
 506                 kfree(buf);
 507                 buf = NULL;
 508                 desc_ptr = NULL;
 509                 len = 0;
 510                 page7_len = 0;
 511         } else {
 512                 desc_ptr = buf + 8;
 513                 len = (desc_ptr[2] << 8) + desc_ptr[3];
 514                 /* skip past overall descriptor */
 515                 desc_ptr += len + 4;
 516         }
 517         if (ses_dev->page10)
 518                 addl_desc_ptr = ses_dev->page10 + 8;
 519         type_ptr = ses_dev->page1_types;
 520         components = 0;
 521         for (i = 0; i < types; i++, type_ptr += 4) {
 522                 for (j = 0; j < type_ptr[1]; j++) {
 523                         char *name = NULL;
 524                         struct enclosure_component *ecomp;
 525
 526                         if (desc_ptr) {
 527                                 if (desc_ptr >= buf + page7_len) {
 528                                         desc_ptr = NULL;
 529                                 } else {
 530                                         len = (desc_ptr[2] << 8) + desc_ptr[3];
 531                                         desc_ptr += 4;
 532                                         /* Add trailing zero - pushes into
 533                                          * reserved space */
 534                                         desc_ptr[len] = '\0';
 535                                         name = desc_ptr;
 536                                 }
 537                         }
 538                         if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 539                             type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
 540
 541                                 if (create)
 542                                         ecomp = enclosure_component_alloc(
 543                                                 edev,
 544                                                 components++,
 545                                                 type_ptr[0],
 546                                                 name);
 547                                 else
 548                                         ecomp = &edev->component[components++];
 549
 550                                 if (!IS_ERR(ecomp)) {
 551                                         ses_get_power_status(edev, ecomp);
 552                                         if (addl_desc_ptr)
 553                                                 ses_process_descriptor(
 554                                                         ecomp,
 555                                                         addl_desc_ptr);
 556                                         if (create)
 557                                                 enclosure_component_register(
 558                                                         ecomp);
 559                                 }
 560                         }
 561                         if (desc_ptr)
 562                                 desc_ptr += len;
 563
 564                         if (addl_desc_ptr &&
 565                             /* only find additional descriptions for specific devices */
 566                             (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 567                              type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
 568                              type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
 569                              /* these elements are optional */
 570                              type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
 571                              type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
 572                              type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
 573                                 addl_desc_ptr += addl_desc_ptr[1] + 2;
 574
 575                 }
 576         }
 577         kfree(buf);
 578         kfree(hdr_buf);
 579 }
 580
 581 static void ses_match_to_enclosure(struct enclosure_device *edev,
 582                                    struct scsi_device *sdev)
 583 {
 584         struct efd efd = {
 585                 .addr = 0,
 586         };
 587
 588         ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
 589
 590         if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
 591                 efd.addr = sas_get_address(sdev);
 592
 593         if (efd.addr) {
 594                 efd.dev = &sdev->sdev_gendev;
 595
 596                 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
 597         }
 598 }
 599
 600 static int ses_intf_add(struct device *cdev,
 601                         struct class_interface *intf)
 602 {
 603         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 604         struct scsi_device *tmp_sdev;
 605         unsigned char *buf = NULL, *hdr_buf, *type_ptr;
 606         struct ses_device *ses_dev;
 607         u32 result;
 608         int i, types, len, components = 0;
 609         int err = -ENOMEM;
 610         int num_enclosures;
 611         struct enclosure_device *edev;
 612         struct ses_component *scomp = NULL;
 613
 614         if (!scsi_device_enclosure(sdev)) {
 615                 /* not an enclosure, but might be in one */
 616                 struct enclosure_device *prev = NULL;
 617
 618                 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 619                         ses_match_to_enclosure(edev, sdev);
 620                         prev = edev;
 621                 }
 622                 return -ENODEV;
 623         }
 624
 625         /* TYPE_ENCLOSURE prints a message in probe */
 626         if (sdev->type != TYPE_ENCLOSURE)
 627                 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
 628
 629         ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
 630         hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 631         if (!hdr_buf || !ses_dev)
 632                 goto err_init_free;
 633
 634         result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
 635         if (result)
 636                 goto recv_failed;
 637
 638         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 639         buf = kzalloc(len, GFP_KERNEL);
 640         if (!buf)
 641                 goto err_free;
 642
 643         result = ses_recv_diag(sdev, 1, buf, len);
 644         if (result)
 645                 goto recv_failed;
 646
 647         types = 0;
 648
 649         /* we always have one main enclosure and the rest are referred
 650          * to as secondary subenclosures */
 651         num_enclosures = buf[1] + 1;
 652
 653         /* begin at the enclosure descriptor */
 654         type_ptr = buf + 8;
 655         /* skip all the enclosure descriptors */
 656         for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
 657                 types += type_ptr[2];
 658                 type_ptr += type_ptr[3] + 4;
 659         }
 660
 661         ses_dev->page1_types = type_ptr;
 662         ses_dev->page1_num_types = types;
 663
 664         for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
 665                 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 666                     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 667                         components += type_ptr[1];
 668         }
 669         ses_dev->page1 = buf;
 670         ses_dev->page1_len = len;
 671         buf = NULL;
 672
 673         result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
 674         if (result)
 675                 goto recv_failed;
 676
 677         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 678         buf = kzalloc(len, GFP_KERNEL);
 679         if (!buf)
 680                 goto err_free;
 681
 682         /* make sure getting page 2 actually works */
 683         result = ses_recv_diag(sdev, 2, buf, len);
 684         if (result)
 685                 goto recv_failed;
 686         ses_dev->page2 = buf;
 687         ses_dev->page2_len = len;
 688         buf = NULL;
 689
 690         /* The additional information page --- allows us
 691          * to match up the devices */
 692         result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
 693         if (!result) {
 694
 695                 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 696                 buf = kzalloc(len, GFP_KERNEL);
 697                 if (!buf)
 698                         goto err_free;
 699
 700                 result = ses_recv_diag(sdev, 10, buf, len);
 701                 if (result)
 702                         goto recv_failed;
 703                 ses_dev->page10 = buf;
 704                 ses_dev->page10_len = len;
 705                 buf = NULL;
 706         }
 707         scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
 708         if (!scomp)
 709                 goto err_free;
 710
 711         edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
 712                                   components, &ses_enclosure_callbacks);
 713         if (IS_ERR(edev)) {
 714                 err = PTR_ERR(edev);
 715                 goto err_free;
 716         }
 717
 718         kfree(hdr_buf);
 719
 720         edev->scratch = ses_dev;
 721         for (i = 0; i < components; i++)
 722                 edev->component[i].scratch = scomp + i;
 723
 724         ses_enclosure_data_process(edev, sdev, 1);
 725
 726         /* see if there are any devices matching before
 727          * we found the enclosure */
 728         shost_for_each_device(tmp_sdev, sdev->host) {
 729                 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
 730                         continue;
 731                 ses_match_to_enclosure(edev, tmp_sdev);
 732         }
 733
 734         return 0;
 735
 736  recv_failed:
 737         sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
 738                     result);
 739         err = -ENODEV;
 740  err_free:
 741         kfree(buf);
 742         kfree(scomp);
 743         kfree(ses_dev->page10);
 744         kfree(ses_dev->page2);
 745         kfree(ses_dev->page1);
 746  err_init_free:
 747         kfree(ses_dev);
 748         kfree(hdr_buf);
 749         sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
 750         return err;
 751 }
 752
 753 static int ses_remove(struct device *dev)
 754 {
 755         return 0;
 756 }
 757
 758 static void ses_intf_remove_component(struct scsi_device *sdev)
 759 {
 760         struct enclosure_device *edev, *prev = NULL;
 761
 762         while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 763                 prev = edev;
 764                 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
 765                         break;
 766         }
 767         if (edev)
 768                 put_device(&edev->edev);
 769 }
 770
 771 static void ses_intf_remove_enclosure(struct scsi_device *sdev)
 772 {
 773         struct enclosure_device *edev;
 774         struct ses_device *ses_dev;
 775
 776         /*  exact match to this enclosure */
 777         edev = enclosure_find(&sdev->sdev_gendev, NULL);
 778         if (!edev)
 779                 return;
 780
 781         enclosure_unregister(edev);
 782
 783         ses_dev = edev->scratch;
 784         edev->scratch = NULL;
 785
 786         kfree(ses_dev->page10);
 787         kfree(ses_dev->page1);
 788         kfree(ses_dev->page2);
 789         kfree(ses_dev);
 790
 791         kfree(edev->component[0].scratch);
 792
 793         put_device(&edev->edev);
 794 }
 795
 796 static void ses_intf_remove(struct device *cdev,
 797                             struct class_interface *intf)
 798 {
 799         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 800
 801         if (!scsi_device_enclosure(sdev))
 802                 ses_intf_remove_component(sdev);
 803         else
 804                 ses_intf_remove_enclosure(sdev);
 805 }
 806
 807 static struct class_interface ses_interface = {
 808         .add_dev        = ses_intf_add,
 809         .remove_dev     = ses_intf_remove,
 810 };
 811
 812 static struct scsi_driver ses_template = {
 813         .gendrv = {
 814                 .name           = "ses",
 815                 .owner          = THIS_MODULE,
 816                 .probe          = ses_probe,
 817                 .remove         = ses_remove,
 818         },
 819 };
 820
 821 static int __init ses_init(void)
 822 {
 823         int err;
 824
 825         err = scsi_register_interface(&ses_interface);
 826         if (err)
 827                 return err;
 828
 829         err = scsi_register_driver(&ses_template.gendrv);
 830         if (err)
 831                 goto out_unreg;
 832
 833         return 0;
 834
 835  out_unreg:
 836         scsi_unregister_interface(&ses_interface);
 837         return err;
 838 }
 839
 840 static void __exit ses_exit(void)
 841 {
 842         scsi_unregister_driver(&ses_template.gendrv);
 843         scsi_unregister_interface(&ses_interface);
 844 }
 845
 846 module_init(ses_init);
 847 module_exit(ses_exit);
 848
 849 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
 850
 851 MODULE_AUTHOR("James Bottomley");
 852 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
 853 MODULE_LICENSE("GPL v2");