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