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
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_cmnd.h>
  31 #include <scsi/scsi_dbg.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_driver.h>
  34 #include <scsi/scsi_host.h>
  35
  36 struct ses_device {
  37         unsigned char *page1;
  38         unsigned char *page1_types;
  39         unsigned char *page2;
  40         unsigned char *page10;
  41         short page1_len;
  42         short page1_num_types;
  43         short page2_len;
  44         short page10_len;
  45 };
  46
  47 struct ses_component {
  48         u64 addr;
  49         unsigned char *desc;
  50 };
  51
  52 static int ses_probe(struct device *dev)
  53 {
  54         struct scsi_device *sdev = to_scsi_device(dev);
  55         int err = -ENODEV;
  56
  57         if (sdev->type != TYPE_ENCLOSURE)
  58                 goto out;
  59
  60         err = 0;
  61         sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
  62
  63  out:
  64         return err;
  65 }
  66
  67 #define SES_TIMEOUT (30 * HZ)
  68 #define SES_RETRIES 3
  69
  70 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
  71                          void *buf, int bufflen)
  72 {
  73         unsigned char cmd[] = {
  74                 RECEIVE_DIAGNOSTIC,
  75                 1,              /* Set PCV bit */
  76                 page_code,
  77                 bufflen >> 8,
  78                 bufflen & 0xff,
  79                 0
  80         };
  81
  82         return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
  83                                 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
  84 }
  85
  86 static int ses_send_diag(struct scsi_device *sdev, int page_code,
  87                          void *buf, int bufflen)
  88 {
  89         u32 result;
  90
  91         unsigned char cmd[] = {
  92                 SEND_DIAGNOSTIC,
  93                 0x10,           /* Set PF bit */
  94                 0,
  95                 bufflen >> 8,
  96                 bufflen & 0xff,
  97                 0
  98         };
  99
 100         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
 101                                   NULL, SES_TIMEOUT, SES_RETRIES, NULL);
 102         if (result)
 103                 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
 104                             result);
 105         return result;
 106 }
 107
 108 static int ses_set_page2_descriptor(struct enclosure_device *edev,
 109                                       struct enclosure_component *ecomp,
 110                                       unsigned char *desc)
 111 {
 112         int i, j, count = 0, descriptor = ecomp->number;
 113         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 114         struct ses_device *ses_dev = edev->scratch;
 115         unsigned char *type_ptr = ses_dev->page1_types;
 116         unsigned char *desc_ptr = ses_dev->page2 + 8;
 117
 118         /* Clear everything */
 119         memset(desc_ptr, 0, ses_dev->page2_len - 8);
 120         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 121                 for (j = 0; j < type_ptr[1]; j++) {
 122                         desc_ptr += 4;
 123                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 124                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 125                                 continue;
 126                         if (count++ == descriptor) {
 127                                 memcpy(desc_ptr, desc, 4);
 128                                 /* set select */
 129                                 desc_ptr[0] |= 0x80;
 130                                 /* clear reserved, just in case */
 131                                 desc_ptr[0] &= 0xf0;
 132                         }
 133                 }
 134         }
 135
 136         return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 137 }
 138
 139 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
 140                                       struct enclosure_component *ecomp)
 141 {
 142         int i, j, count = 0, descriptor = ecomp->number;
 143         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 144         struct ses_device *ses_dev = edev->scratch;
 145         unsigned char *type_ptr = ses_dev->page1_types;
 146         unsigned char *desc_ptr = ses_dev->page2 + 8;
 147
 148         ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 149
 150         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 151                 for (j = 0; j < type_ptr[1]; j++) {
 152                         desc_ptr += 4;
 153                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 154                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 155                                 continue;
 156                         if (count++ == descriptor)
 157                                 return desc_ptr;
 158                 }
 159         }
 160         return NULL;
 161 }
 162
 163 /* For device slot and array device slot elements, byte 3 bit 6
 164  * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
 165  * code stands these bits are shifted 4 positions right so in
 166  * sysfs they will appear as bits 2 and 1 respectively. Strange. */
 167 static void ses_get_fault(struct enclosure_device *edev,
 168                           struct enclosure_component *ecomp)
 169 {
 170         unsigned char *desc;
 171
 172         desc = ses_get_page2_descriptor(edev, ecomp);
 173         if (desc)
 174                 ecomp->fault = (desc[3] & 0x60) >> 4;
 175 }
 176
 177 static int ses_set_fault(struct enclosure_device *edev,
 178                           struct enclosure_component *ecomp,
 179                          enum enclosure_component_setting val)
 180 {
 181         unsigned char desc[4] = {0 };
 182
 183         switch (val) {
 184         case ENCLOSURE_SETTING_DISABLED:
 185                 /* zero is disabled */
 186                 break;
 187         case ENCLOSURE_SETTING_ENABLED:
 188                 desc[3] = 0x20;
 189                 break;
 190         default:
 191                 /* SES doesn't do the SGPIO blink settings */
 192                 return -EINVAL;
 193         }
 194
 195         return ses_set_page2_descriptor(edev, ecomp, desc);
 196 }
 197
 198 static void ses_get_status(struct enclosure_device *edev,
 199                            struct enclosure_component *ecomp)
 200 {
 201         unsigned char *desc;
 202
 203         desc = ses_get_page2_descriptor(edev, ecomp);
 204         if (desc)
 205                 ecomp->status = (desc[0] & 0x0f);
 206 }
 207
 208 static void ses_get_locate(struct enclosure_device *edev,
 209                            struct enclosure_component *ecomp)
 210 {
 211         unsigned char *desc;
 212
 213         desc = ses_get_page2_descriptor(edev, ecomp);
 214         if (desc)
 215                 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
 216 }
 217
 218 static int ses_set_locate(struct enclosure_device *edev,
 219                           struct enclosure_component *ecomp,
 220                           enum enclosure_component_setting val)
 221 {
 222         unsigned char desc[4] = {0 };
 223
 224         switch (val) {
 225         case ENCLOSURE_SETTING_DISABLED:
 226                 /* zero is disabled */
 227                 break;
 228         case ENCLOSURE_SETTING_ENABLED:
 229                 desc[2] = 0x02;
 230                 break;
 231         default:
 232                 /* SES doesn't do the SGPIO blink settings */
 233                 return -EINVAL;
 234         }
 235         return ses_set_page2_descriptor(edev, ecomp, desc);
 236 }
 237
 238 static int ses_set_active(struct enclosure_device *edev,
 239                           struct enclosure_component *ecomp,
 240                           enum enclosure_component_setting val)
 241 {
 242         unsigned char desc[4] = {0 };
 243
 244         switch (val) {
 245         case ENCLOSURE_SETTING_DISABLED:
 246                 /* zero is disabled */
 247                 ecomp->active = 0;
 248                 break;
 249         case ENCLOSURE_SETTING_ENABLED:
 250                 desc[2] = 0x80;
 251                 ecomp->active = 1;
 252                 break;
 253         default:
 254                 /* SES doesn't do the SGPIO blink settings */
 255                 return -EINVAL;
 256         }
 257         return ses_set_page2_descriptor(edev, ecomp, desc);
 258 }
 259
 260 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
 261         .get_fault              = ses_get_fault,
 262         .set_fault              = ses_set_fault,
 263         .get_status             = ses_get_status,
 264         .get_locate             = ses_get_locate,
 265         .set_locate             = ses_set_locate,
 266         .set_active             = ses_set_active,
 267 };
 268
 269 struct ses_host_edev {
 270         struct Scsi_Host *shost;
 271         struct enclosure_device *edev;
 272 };
 273
 274 #if 0
 275 int ses_match_host(struct enclosure_device *edev, void *data)
 276 {
 277         struct ses_host_edev *sed = data;
 278         struct scsi_device *sdev;
 279
 280         if (!scsi_is_sdev_device(edev->edev.parent))
 281                 return 0;
 282
 283         sdev = to_scsi_device(edev->edev.parent);
 284
 285         if (sdev->host != sed->shost)
 286                 return 0;
 287
 288         sed->edev = edev;
 289         return 1;
 290 }
 291 #endif  /*  0  */
 292
 293 static void ses_process_descriptor(struct enclosure_component *ecomp,
 294                                    unsigned char *desc)
 295 {
 296         int eip = desc[0] & 0x10;
 297         int invalid = desc[0] & 0x80;
 298         enum scsi_protocol proto = desc[0] & 0x0f;
 299         u64 addr = 0;
 300         struct ses_component *scomp = ecomp->scratch;
 301         unsigned char *d;
 302
 303         scomp->desc = desc;
 304
 305         if (invalid)
 306                 return;
 307
 308         switch (proto) {
 309         case SCSI_PROTOCOL_SAS:
 310                 if (eip)
 311                         d = desc + 8;
 312                 else
 313                         d = desc + 4;
 314                 /* only take the phy0 addr */
 315                 addr = (u64)d[12] << 56 |
 316                         (u64)d[13] << 48 |
 317                         (u64)d[14] << 40 |
 318                         (u64)d[15] << 32 |
 319                         (u64)d[16] << 24 |
 320                         (u64)d[17] << 16 |
 321                         (u64)d[18] << 8 |
 322                         (u64)d[19];
 323                 break;
 324         default:
 325                 /* FIXME: Need to add more protocols than just SAS */
 326                 break;
 327         }
 328         scomp->addr = addr;
 329 }
 330
 331 struct efd {
 332         u64 addr;
 333         struct device *dev;
 334 };
 335
 336 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
 337                                       void *data)
 338 {
 339         struct efd *efd = data;
 340         int i;
 341         struct ses_component *scomp;
 342
 343         if (!edev->component[0].scratch)
 344                 return 0;
 345
 346         for (i = 0; i < edev->components; i++) {
 347                 scomp = edev->component[i].scratch;
 348                 if (scomp->addr != efd->addr)
 349                         continue;
 350
 351                 enclosure_add_device(edev, i, efd->dev);
 352                 return 1;
 353         }
 354         return 0;
 355 }
 356
 357 #define INIT_ALLOC_SIZE 32
 358
 359 static void ses_enclosure_data_process(struct enclosure_device *edev,
 360                                        struct scsi_device *sdev,
 361                                        int create)
 362 {
 363         u32 result;
 364         unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
 365         int i, j, page7_len, len, components;
 366         struct ses_device *ses_dev = edev->scratch;
 367         int types = ses_dev->page1_num_types;
 368         unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 369
 370         if (!hdr_buf)
 371                 goto simple_populate;
 372
 373         /* re-read page 10 */
 374         if (ses_dev->page10)
 375                 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
 376         /* Page 7 for the descriptors is optional */
 377         result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
 378         if (result)
 379                 goto simple_populate;
 380
 381         page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 382         /* add 1 for trailing '\0' we'll use */
 383         buf = kzalloc(len + 1, GFP_KERNEL);
 384         if (!buf)
 385                 goto simple_populate;
 386         result = ses_recv_diag(sdev, 7, buf, len);
 387         if (result) {
 388  simple_populate:
 389                 kfree(buf);
 390                 buf = NULL;
 391                 desc_ptr = NULL;
 392                 len = 0;
 393                 page7_len = 0;
 394         } else {
 395                 desc_ptr = buf + 8;
 396                 len = (desc_ptr[2] << 8) + desc_ptr[3];
 397                 /* skip past overall descriptor */
 398                 desc_ptr += len + 4;
 399         }
 400         if (ses_dev->page10)
 401                 addl_desc_ptr = ses_dev->page10 + 8;
 402         type_ptr = ses_dev->page1_types;
 403         components = 0;
 404         for (i = 0; i < types; i++, type_ptr += 4) {
 405                 for (j = 0; j < type_ptr[1]; j++) {
 406                         char *name = NULL;
 407                         struct enclosure_component *ecomp;
 408
 409                         if (desc_ptr) {
 410                                 if (desc_ptr >= buf + page7_len) {
 411                                         desc_ptr = NULL;
 412                                 } else {
 413                                         len = (desc_ptr[2] << 8) + desc_ptr[3];
 414                                         desc_ptr += 4;
 415                                         /* Add trailing zero - pushes into
 416                                          * reserved space */
 417                                         desc_ptr[len] = '\0';
 418                                         name = desc_ptr;
 419                                 }
 420                         }
 421                         if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 422                             type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
 423
 424                                 if (create)
 425                                         ecomp = enclosure_component_register(edev,
 426                                                                              components++,
 427                                                                              type_ptr[0],
 428                                                                              name);
 429                                 else
 430                                         ecomp = &edev->component[components++];
 431
 432                                 if (!IS_ERR(ecomp) && addl_desc_ptr)
 433                                         ses_process_descriptor(ecomp,
 434                                                                addl_desc_ptr);
 435                         }
 436                         if (desc_ptr)
 437                                 desc_ptr += len;
 438
 439                         if (addl_desc_ptr)
 440                                 addl_desc_ptr += addl_desc_ptr[1] + 2;
 441
 442                 }
 443         }
 444         kfree(buf);
 445         kfree(hdr_buf);
 446 }
 447
 448 static void ses_match_to_enclosure(struct enclosure_device *edev,
 449                                    struct scsi_device *sdev)
 450 {
 451         unsigned char *buf;
 452         unsigned char *desc;
 453         unsigned int vpd_len;
 454         struct efd efd = {
 455                 .addr = 0,
 456         };
 457
 458         buf = kmalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 459         if (!buf || scsi_get_vpd_page(sdev, 0x83, buf, INIT_ALLOC_SIZE))
 460                 goto free;
 461
 462         ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
 463
 464         vpd_len = ((buf[2] << 8) | buf[3]) + 4;
 465         kfree(buf);
 466         buf = kmalloc(vpd_len, GFP_KERNEL);
 467         if (!buf ||scsi_get_vpd_page(sdev, 0x83, buf, vpd_len))
 468                 goto free;
 469
 470         desc = buf + 4;
 471         while (desc < buf + vpd_len) {
 472                 enum scsi_protocol proto = desc[0] >> 4;
 473                 u8 code_set = desc[0] & 0x0f;
 474                 u8 piv = desc[1] & 0x80;
 475                 u8 assoc = (desc[1] & 0x30) >> 4;
 476                 u8 type = desc[1] & 0x0f;
 477                 u8 len = desc[3];
 478
 479                 if (piv && code_set == 1 && assoc == 1
 480                     && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
 481                         efd.addr = (u64)desc[4] << 56 |
 482                                 (u64)desc[5] << 48 |
 483                                 (u64)desc[6] << 40 |
 484                                 (u64)desc[7] << 32 |
 485                                 (u64)desc[8] << 24 |
 486                                 (u64)desc[9] << 16 |
 487                                 (u64)desc[10] << 8 |
 488                                 (u64)desc[11];
 489
 490                 desc += len + 4;
 491         }
 492         if (!efd.addr)
 493                 goto free;
 494
 495         efd.dev = &sdev->sdev_gendev;
 496
 497         enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
 498  free:
 499         kfree(buf);
 500 }
 501
 502 static int ses_intf_add(struct device *cdev,
 503                         struct class_interface *intf)
 504 {
 505         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 506         struct scsi_device *tmp_sdev;
 507         unsigned char *buf = NULL, *hdr_buf, *type_ptr;
 508         struct ses_device *ses_dev;
 509         u32 result;
 510         int i, types, len, components = 0;
 511         int err = -ENOMEM;
 512         int num_enclosures;
 513         struct enclosure_device *edev;
 514         struct ses_component *scomp = NULL;
 515
 516         if (!scsi_device_enclosure(sdev)) {
 517                 /* not an enclosure, but might be in one */
 518                 struct enclosure_device *prev = NULL;
 519
 520                 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 521                         ses_match_to_enclosure(edev, sdev);
 522                         prev = edev;
 523                 }
 524                 return -ENODEV;
 525         }
 526
 527         /* TYPE_ENCLOSURE prints a message in probe */
 528         if (sdev->type != TYPE_ENCLOSURE)
 529                 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
 530
 531         ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
 532         hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 533         if (!hdr_buf || !ses_dev)
 534                 goto err_init_free;
 535
 536         result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
 537         if (result)
 538                 goto recv_failed;
 539
 540         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 541         buf = kzalloc(len, GFP_KERNEL);
 542         if (!buf)
 543                 goto err_free;
 544
 545         result = ses_recv_diag(sdev, 1, buf, len);
 546         if (result)
 547                 goto recv_failed;
 548
 549         types = 0;
 550
 551         /* we always have one main enclosure and the rest are referred
 552          * to as secondary subenclosures */
 553         num_enclosures = buf[1] + 1;
 554
 555         /* begin at the enclosure descriptor */
 556         type_ptr = buf + 8;
 557         /* skip all the enclosure descriptors */
 558         for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
 559                 types += type_ptr[2];
 560                 type_ptr += type_ptr[3] + 4;
 561         }
 562
 563         ses_dev->page1_types = type_ptr;
 564         ses_dev->page1_num_types = types;
 565
 566         for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
 567                 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 568                     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 569                         components += type_ptr[1];
 570         }
 571         ses_dev->page1 = buf;
 572         ses_dev->page1_len = len;
 573         buf = NULL;
 574
 575         result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
 576         if (result)
 577                 goto recv_failed;
 578
 579         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 580         buf = kzalloc(len, GFP_KERNEL);
 581         if (!buf)
 582                 goto err_free;
 583
 584         /* make sure getting page 2 actually works */
 585         result = ses_recv_diag(sdev, 2, buf, len);
 586         if (result)
 587                 goto recv_failed;
 588         ses_dev->page2 = buf;
 589         ses_dev->page2_len = len;
 590         buf = NULL;
 591
 592         /* The additional information page --- allows us
 593          * to match up the devices */
 594         result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
 595         if (!result) {
 596
 597                 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 598                 buf = kzalloc(len, GFP_KERNEL);
 599                 if (!buf)
 600                         goto err_free;
 601
 602                 result = ses_recv_diag(sdev, 10, buf, len);
 603                 if (result)
 604                         goto recv_failed;
 605                 ses_dev->page10 = buf;
 606                 ses_dev->page10_len = len;
 607                 buf = NULL;
 608         }
 609         scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
 610         if (!scomp)
 611                 goto err_free;
 612
 613         edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
 614                                   components, &ses_enclosure_callbacks);
 615         if (IS_ERR(edev)) {
 616                 err = PTR_ERR(edev);
 617                 goto err_free;
 618         }
 619
 620         kfree(hdr_buf);
 621
 622         edev->scratch = ses_dev;
 623         for (i = 0; i < components; i++)
 624                 edev->component[i].scratch = scomp + i;
 625
 626         ses_enclosure_data_process(edev, sdev, 1);
 627
 628         /* see if there are any devices matching before
 629          * we found the enclosure */
 630         shost_for_each_device(tmp_sdev, sdev->host) {
 631                 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
 632                         continue;
 633                 ses_match_to_enclosure(edev, tmp_sdev);
 634         }
 635
 636         return 0;
 637
 638  recv_failed:
 639         sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
 640                     result);
 641         err = -ENODEV;
 642  err_free:
 643         kfree(buf);
 644         kfree(scomp);
 645         kfree(ses_dev->page10);
 646         kfree(ses_dev->page2);
 647         kfree(ses_dev->page1);
 648  err_init_free:
 649         kfree(ses_dev);
 650         kfree(hdr_buf);
 651         sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
 652         return err;
 653 }
 654
 655 static int ses_remove(struct device *dev)
 656 {
 657         return 0;
 658 }
 659
 660 static void ses_intf_remove_component(struct scsi_device *sdev)
 661 {
 662         struct enclosure_device *edev, *prev = NULL;
 663
 664         while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 665                 prev = edev;
 666                 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
 667                         break;
 668         }
 669         if (edev)
 670                 put_device(&edev->edev);
 671 }
 672
 673 static void ses_intf_remove_enclosure(struct scsi_device *sdev)
 674 {
 675         struct enclosure_device *edev;
 676         struct ses_device *ses_dev;
 677
 678         /*  exact match to this enclosure */
 679         edev = enclosure_find(&sdev->sdev_gendev, NULL);
 680         if (!edev)
 681                 return;
 682
 683         ses_dev = edev->scratch;
 684         edev->scratch = NULL;
 685
 686         kfree(ses_dev->page10);
 687         kfree(ses_dev->page1);
 688         kfree(ses_dev->page2);
 689         kfree(ses_dev);
 690
 691         kfree(edev->component[0].scratch);
 692
 693         put_device(&edev->edev);
 694         enclosure_unregister(edev);
 695 }
 696
 697 static void ses_intf_remove(struct device *cdev,
 698                             struct class_interface *intf)
 699 {
 700         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 701
 702         if (!scsi_device_enclosure(sdev))
 703                 ses_intf_remove_component(sdev);
 704         else
 705                 ses_intf_remove_enclosure(sdev);
 706 }
 707
 708 static struct class_interface ses_interface = {
 709         .add_dev        = ses_intf_add,
 710         .remove_dev     = ses_intf_remove,
 711 };
 712
 713 static struct scsi_driver ses_template = {
 714         .owner                  = THIS_MODULE,
 715         .gendrv = {
 716                 .name           = "ses",
 717                 .probe          = ses_probe,
 718                 .remove         = ses_remove,
 719         },
 720 };
 721
 722 static int __init ses_init(void)
 723 {
 724         int err;
 725
 726         err = scsi_register_interface(&ses_interface);
 727         if (err)
 728                 return err;
 729
 730         err = scsi_register_driver(&ses_template.gendrv);
 731         if (err)
 732                 goto out_unreg;
 733
 734         return 0;
 735
 736  out_unreg:
 737         scsi_unregister_interface(&ses_interface);
 738         return err;
 739 }
 740
 741 static void __exit ses_exit(void)
 742 {
 743         scsi_unregister_driver(&ses_template.gendrv);
 744         scsi_unregister_interface(&ses_interface);
 745 }
 746
 747 module_init(ses_init);
 748 module_exit(ses_exit);
 749
 750 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
 751
 752 MODULE_AUTHOR("James Bottomley");
 753 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
 754 MODULE_LICENSE("GPL v2");