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_gendev)) 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"); 854