1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ACPI Platform Firmware Runtime Update Device driver 4 * 5 * Copyright (C) 2021 Intel Corporation 6 * Author: Chen Yu <yu.c.chen@intel.com> 7 * 8 * pfr_update driver is used for Platform Firmware Runtime 9 * Update, which includes the code injection and driver update. 10 */ 11 #include <linux/acpi.h> 12 #include <linux/device.h> 13 #include <linux/efi.h> 14 #include <linux/err.h> 15 #include <linux/errno.h> 16 #include <linux/file.h> 17 #include <linux/fs.h> 18 #include <linux/idr.h> 19 #include <linux/miscdevice.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 #include <linux/string.h> 23 #include <linux/uaccess.h> 24 #include <linux/uio.h> 25 #include <linux/uuid.h> 26 27 #include <uapi/linux/pfrut.h> 28 29 #define PFRU_FUNC_STANDARD_QUERY 0 30 #define PFRU_FUNC_QUERY_UPDATE_CAP 1 31 #define PFRU_FUNC_QUERY_BUF 2 32 #define PFRU_FUNC_START 3 33 34 #define PFRU_CODE_INJECT_TYPE 1 35 #define PFRU_DRIVER_UPDATE_TYPE 2 36 37 #define PFRU_REVID_1 1 38 #define PFRU_REVID_2 2 39 #define PFRU_DEFAULT_REV_ID PFRU_REVID_1 40 41 enum cap_index { 42 CAP_STATUS_IDX = 0, 43 CAP_UPDATE_IDX = 1, 44 CAP_CODE_TYPE_IDX = 2, 45 CAP_FW_VER_IDX = 3, 46 CAP_CODE_RT_VER_IDX = 4, 47 CAP_DRV_TYPE_IDX = 5, 48 CAP_DRV_RT_VER_IDX = 6, 49 CAP_DRV_SVN_IDX = 7, 50 CAP_PLAT_ID_IDX = 8, 51 CAP_OEM_ID_IDX = 9, 52 CAP_OEM_INFO_IDX = 10, 53 CAP_NR_IDX 54 }; 55 56 enum buf_index { 57 BUF_STATUS_IDX = 0, 58 BUF_EXT_STATUS_IDX = 1, 59 BUF_ADDR_LOW_IDX = 2, 60 BUF_ADDR_HI_IDX = 3, 61 BUF_SIZE_IDX = 4, 62 BUF_NR_IDX 63 }; 64 65 enum update_index { 66 UPDATE_STATUS_IDX = 0, 67 UPDATE_EXT_STATUS_IDX = 1, 68 UPDATE_AUTH_TIME_LOW_IDX = 2, 69 UPDATE_AUTH_TIME_HI_IDX = 3, 70 UPDATE_EXEC_TIME_LOW_IDX = 4, 71 UPDATE_EXEC_TIME_HI_IDX = 5, 72 UPDATE_NR_IDX 73 }; 74 75 enum pfru_start_action { 76 START_STAGE = 0, 77 START_ACTIVATE = 1, 78 START_STAGE_ACTIVATE = 2, 79 }; 80 81 struct pfru_device { 82 u32 rev_id, index; 83 struct device *parent_dev; 84 struct miscdevice miscdev; 85 }; 86 87 static DEFINE_IDA(pfru_ida); 88 89 /* 90 * Manual reference: 91 * https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf 92 * 93 * pfru_guid is the parameter for _DSM method 94 */ 95 static const guid_t pfru_guid = 96 GUID_INIT(0xECF9533B, 0x4A3C, 0x4E89, 0x93, 0x9E, 0xC7, 0x71, 97 0x12, 0x60, 0x1C, 0x6D); 98 99 /* pfru_code_inj_guid is the UUID to identify code injection EFI capsule file */ 100 static const guid_t pfru_code_inj_guid = 101 GUID_INIT(0xB2F84B79, 0x7B6E, 0x4E45, 0x88, 0x5F, 0x3F, 0xB9, 102 0xBB, 0x18, 0x54, 0x02); 103 104 /* pfru_drv_update_guid is the UUID to identify driver update EFI capsule file */ 105 static const guid_t pfru_drv_update_guid = 106 GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE, 107 0x80, 0x97, 0xA0, 0xDF); 108 109 static inline int pfru_valid_revid(u32 id) 110 { 111 return id == PFRU_REVID_1 || id == PFRU_REVID_2; 112 } 113 114 static inline struct pfru_device *to_pfru_dev(struct file *file) 115 { 116 return container_of(file->private_data, struct pfru_device, miscdev); 117 } 118 119 static int query_capability(struct pfru_update_cap_info *cap_hdr, 120 struct pfru_device *pfru_dev) 121 { 122 acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev); 123 union acpi_object *out_obj, *elem; 124 int ret = -EINVAL; 125 126 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid, 127 pfru_dev->rev_id, 128 PFRU_FUNC_QUERY_UPDATE_CAP, 129 NULL, ACPI_TYPE_PACKAGE); 130 if (!out_obj) { 131 dev_dbg(pfru_dev->parent_dev, 132 "Query cap failed with no object\n"); 133 return ret; 134 } 135 136 if (out_obj->package.count < CAP_NR_IDX || 137 out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER || 138 out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER || 139 out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER || 140 out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER || 141 out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER || 142 out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER || 143 out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER || 144 out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER || 145 out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER || 146 out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER || 147 out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER) { 148 dev_dbg(pfru_dev->parent_dev, 149 "Query cap failed with invalid package count/type\n"); 150 goto free_acpi_buffer; 151 } 152 153 elem = out_obj->package.elements; 154 155 cap_hdr->status = elem[CAP_STATUS_IDX].integer.value; 156 if (cap_hdr->status != DSM_SUCCEED) { 157 ret = -EBUSY; 158 dev_dbg(pfru_dev->parent_dev, "Query cap Error Status:%d\n", 159 cap_hdr->status); 160 goto free_acpi_buffer; 161 } 162 163 if (elem[CAP_CODE_TYPE_IDX].buffer.length > sizeof(cap_hdr->code_type) || 164 elem[CAP_DRV_TYPE_IDX].buffer.length > sizeof(cap_hdr->drv_type) || 165 elem[CAP_PLAT_ID_IDX].buffer.length > sizeof(cap_hdr->platform_id) || 166 elem[CAP_OEM_ID_IDX].buffer.length > sizeof(cap_hdr->oem_id)) 167 goto free_acpi_buffer; 168 169 cap_hdr->update_cap = elem[CAP_UPDATE_IDX].integer.value; 170 memcpy(&cap_hdr->code_type, 171 elem[CAP_CODE_TYPE_IDX].buffer.pointer, 172 elem[CAP_CODE_TYPE_IDX].buffer.length); 173 cap_hdr->fw_version = elem[CAP_FW_VER_IDX].integer.value; 174 cap_hdr->code_rt_version = elem[CAP_CODE_RT_VER_IDX].integer.value; 175 memcpy(&cap_hdr->drv_type, 176 elem[CAP_DRV_TYPE_IDX].buffer.pointer, 177 elem[CAP_DRV_TYPE_IDX].buffer.length); 178 cap_hdr->drv_rt_version = elem[CAP_DRV_RT_VER_IDX].integer.value; 179 cap_hdr->drv_svn = elem[CAP_DRV_SVN_IDX].integer.value; 180 memcpy(&cap_hdr->platform_id, 181 elem[CAP_PLAT_ID_IDX].buffer.pointer, 182 elem[CAP_PLAT_ID_IDX].buffer.length); 183 memcpy(&cap_hdr->oem_id, 184 elem[CAP_OEM_ID_IDX].buffer.pointer, 185 elem[CAP_OEM_ID_IDX].buffer.length); 186 cap_hdr->oem_info_len = elem[CAP_OEM_INFO_IDX].buffer.length; 187 188 ret = 0; 189 190 free_acpi_buffer: 191 ACPI_FREE(out_obj); 192 193 return ret; 194 } 195 196 static int query_buffer(struct pfru_com_buf_info *info, 197 struct pfru_device *pfru_dev) 198 { 199 acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev); 200 union acpi_object *out_obj; 201 int ret = -EINVAL; 202 203 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid, 204 pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF, 205 NULL, ACPI_TYPE_PACKAGE); 206 if (!out_obj) { 207 dev_dbg(pfru_dev->parent_dev, 208 "Query buf failed with no object\n"); 209 return ret; 210 } 211 212 if (out_obj->package.count < BUF_NR_IDX || 213 out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER || 214 out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER || 215 out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER || 216 out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER || 217 out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER) { 218 dev_dbg(pfru_dev->parent_dev, 219 "Query buf failed with invalid package count/type\n"); 220 goto free_acpi_buffer; 221 } 222 223 info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value; 224 info->ext_status = 225 out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value; 226 if (info->status != DSM_SUCCEED) { 227 ret = -EBUSY; 228 dev_dbg(pfru_dev->parent_dev, 229 "Query buf failed with Error Status:%d\n", info->status); 230 dev_dbg(pfru_dev->parent_dev, 231 "Query buf failed with Error Extended Status:%d\n", info->ext_status); 232 233 goto free_acpi_buffer; 234 } 235 236 info->addr_lo = 237 out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value; 238 info->addr_hi = 239 out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value; 240 info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value; 241 242 ret = 0; 243 244 free_acpi_buffer: 245 ACPI_FREE(out_obj); 246 247 return ret; 248 } 249 250 static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr, 251 struct pfru_device *pfru_dev) 252 { 253 const efi_guid_t *image_type_id = &img_hdr->image_type_id; 254 255 /* check whether this is a code injection or driver update */ 256 if (guid_equal(image_type_id, &pfru_code_inj_guid)) 257 return PFRU_CODE_INJECT_TYPE; 258 259 if (guid_equal(image_type_id, &pfru_drv_update_guid)) 260 return PFRU_DRIVER_UPDATE_TYPE; 261 262 return -EINVAL; 263 } 264 265 static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr, 266 int size) 267 { 268 /* 269 * The (u64 hw_ins) was introduced in UEFI spec version 2, 270 * and (u64 capsule_support) was introduced in version 3. 271 * The size needs to be adjusted accordingly. That is to 272 * say, version 1 should subtract the size of hw_ins+capsule_support, 273 * and version 2 should sbstract the size of capsule_support. 274 */ 275 size += sizeof(struct efi_manage_capsule_image_header); 276 switch (img_hdr->ver) { 277 case 1: 278 return size - 2 * sizeof(u64); 279 280 case 2: 281 return size - sizeof(u64); 282 283 default: 284 /* only support version 1 and 2 */ 285 return -EINVAL; 286 } 287 } 288 289 static bool applicable_image(const void *data, struct pfru_update_cap_info *cap, 290 struct pfru_device *pfru_dev) 291 { 292 struct pfru_payload_hdr *payload_hdr; 293 const efi_capsule_header_t *cap_hdr = data; 294 const struct efi_manage_capsule_header *m_hdr; 295 const struct efi_manage_capsule_image_header *m_img_hdr; 296 const struct efi_image_auth *auth; 297 int type, size; 298 299 /* 300 * If the code in the capsule is older than the current 301 * firmware code, the update will be rejected by the firmware, 302 * so check the version of it upfront without engaging the 303 * Management Mode update mechanism which may be costly. 304 */ 305 size = cap_hdr->headersize; 306 m_hdr = data + size; 307 /* 308 * Current data structure size plus variable array indicated 309 * by number of (emb_drv_cnt + payload_cnt) 310 */ 311 size += offsetof(struct efi_manage_capsule_header, offset_list) + 312 (m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64); 313 m_img_hdr = data + size; 314 315 type = get_image_type(m_img_hdr, pfru_dev); 316 if (type < 0) { 317 dev_dbg(pfru_dev->parent_dev, "Invalid image type\n"); 318 return false; 319 } 320 321 size = adjust_efi_size(m_img_hdr, size); 322 if (size < 0) { 323 dev_dbg(pfru_dev->parent_dev, "Invalid image size\n"); 324 return false; 325 } 326 327 auth = data + size; 328 size += sizeof(u64) + auth->auth_info.hdr.len; 329 payload_hdr = (struct pfru_payload_hdr *)(data + size); 330 331 /* finally compare the version */ 332 if (type == PFRU_CODE_INJECT_TYPE) 333 return payload_hdr->rt_ver >= cap->code_rt_version; 334 335 return payload_hdr->svn_ver >= cap->drv_svn; 336 } 337 338 static void print_update_debug_info(struct pfru_updated_result *result, 339 struct pfru_device *pfru_dev) 340 { 341 dev_dbg(pfru_dev->parent_dev, "Update result:\n"); 342 dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n", 343 result->low_auth_time); 344 dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n", 345 result->high_auth_time); 346 dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n", 347 result->low_exec_time); 348 dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n", 349 result->high_exec_time); 350 } 351 352 static int start_update(int action, struct pfru_device *pfru_dev) 353 { 354 union acpi_object *out_obj, in_obj, in_buf; 355 struct pfru_updated_result update_result; 356 acpi_handle handle; 357 int ret = -EINVAL; 358 359 memset(&in_obj, 0, sizeof(in_obj)); 360 memset(&in_buf, 0, sizeof(in_buf)); 361 in_obj.type = ACPI_TYPE_PACKAGE; 362 in_obj.package.count = 1; 363 in_obj.package.elements = &in_buf; 364 in_buf.type = ACPI_TYPE_INTEGER; 365 in_buf.integer.value = action; 366 367 handle = ACPI_HANDLE(pfru_dev->parent_dev); 368 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid, 369 pfru_dev->rev_id, PFRU_FUNC_START, 370 &in_obj, ACPI_TYPE_PACKAGE); 371 if (!out_obj) { 372 dev_dbg(pfru_dev->parent_dev, 373 "Update failed to start with no object\n"); 374 return ret; 375 } 376 377 if (out_obj->package.count < UPDATE_NR_IDX || 378 out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER || 379 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER || 380 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER || 381 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER || 382 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER || 383 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER) { 384 dev_dbg(pfru_dev->parent_dev, 385 "Update failed with invalid package count/type\n"); 386 goto free_acpi_buffer; 387 } 388 389 update_result.status = 390 out_obj->package.elements[UPDATE_STATUS_IDX].integer.value; 391 update_result.ext_status = 392 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value; 393 394 if (update_result.status != DSM_SUCCEED) { 395 ret = -EBUSY; 396 dev_dbg(pfru_dev->parent_dev, 397 "Update failed with Error Status:%d\n", update_result.status); 398 dev_dbg(pfru_dev->parent_dev, 399 "Update failed with Error Extended Status:%d\n", 400 update_result.ext_status); 401 402 goto free_acpi_buffer; 403 } 404 405 update_result.low_auth_time = 406 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value; 407 update_result.high_auth_time = 408 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value; 409 update_result.low_exec_time = 410 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value; 411 update_result.high_exec_time = 412 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value; 413 414 print_update_debug_info(&update_result, pfru_dev); 415 ret = 0; 416 417 free_acpi_buffer: 418 ACPI_FREE(out_obj); 419 420 return ret; 421 } 422 423 static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 424 { 425 struct pfru_update_cap_info cap_hdr; 426 struct pfru_device *pfru_dev = to_pfru_dev(file); 427 void __user *p = (void __user *)arg; 428 u32 rev; 429 int ret; 430 431 switch (cmd) { 432 case PFRU_IOC_QUERY_CAP: 433 ret = query_capability(&cap_hdr, pfru_dev); 434 if (ret) 435 return ret; 436 437 if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr))) 438 return -EFAULT; 439 440 return 0; 441 442 case PFRU_IOC_SET_REV: 443 if (copy_from_user(&rev, p, sizeof(rev))) 444 return -EFAULT; 445 446 if (!pfru_valid_revid(rev)) 447 return -EINVAL; 448 449 pfru_dev->rev_id = rev; 450 451 return 0; 452 453 case PFRU_IOC_STAGE: 454 return start_update(START_STAGE, pfru_dev); 455 456 case PFRU_IOC_ACTIVATE: 457 return start_update(START_ACTIVATE, pfru_dev); 458 459 case PFRU_IOC_STAGE_ACTIVATE: 460 return start_update(START_STAGE_ACTIVATE, pfru_dev); 461 462 default: 463 return -ENOTTY; 464 } 465 } 466 467 static ssize_t pfru_write(struct file *file, const char __user *buf, 468 size_t len, loff_t *ppos) 469 { 470 struct pfru_device *pfru_dev = to_pfru_dev(file); 471 struct pfru_update_cap_info cap; 472 struct pfru_com_buf_info buf_info; 473 phys_addr_t phy_addr; 474 struct iov_iter iter; 475 struct iovec iov; 476 char *buf_ptr; 477 int ret; 478 479 ret = query_buffer(&buf_info, pfru_dev); 480 if (ret) 481 return ret; 482 483 if (len > buf_info.buf_size) { 484 dev_dbg(pfru_dev->parent_dev, "Capsule image size too large\n"); 485 return -EINVAL; 486 } 487 488 iov.iov_base = (void __user *)buf; 489 iov.iov_len = len; 490 iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len); 491 492 /* map the communication buffer */ 493 phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo); 494 buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB); 495 if (!buf_ptr) { 496 dev_dbg(pfru_dev->parent_dev, "Failed to remap the buffer\n"); 497 return -ENOMEM; 498 } 499 500 if (!copy_from_iter_full(buf_ptr, len, &iter)) { 501 dev_dbg(pfru_dev->parent_dev, 502 "Failed to copy the data from the user space buffer\n"); 503 ret = -EINVAL; 504 goto unmap; 505 } 506 507 /* check if the capsule header has a valid version number */ 508 ret = query_capability(&cap, pfru_dev); 509 if (ret) 510 goto unmap; 511 512 if (!applicable_image(buf_ptr, &cap, pfru_dev)) 513 ret = -EINVAL; 514 515 unmap: 516 memunmap(buf_ptr); 517 518 return ret ?: len; 519 } 520 521 static const struct file_operations acpi_pfru_fops = { 522 .owner = THIS_MODULE, 523 .write = pfru_write, 524 .unlocked_ioctl = pfru_ioctl, 525 .llseek = noop_llseek, 526 }; 527 528 static void acpi_pfru_remove(struct platform_device *pdev) 529 { 530 struct pfru_device *pfru_dev = platform_get_drvdata(pdev); 531 532 misc_deregister(&pfru_dev->miscdev); 533 } 534 535 static void pfru_put_idx(void *data) 536 { 537 struct pfru_device *pfru_dev = data; 538 539 ida_free(&pfru_ida, pfru_dev->index); 540 } 541 542 static int acpi_pfru_probe(struct platform_device *pdev) 543 { 544 struct pfru_device *pfru_dev; 545 acpi_handle handle; 546 int ret; 547 548 handle = ACPI_HANDLE(&pdev->dev); 549 if (!handle) 550 return -ENODEV; 551 552 if (!acpi_has_method(handle, "_DSM")) { 553 dev_dbg(&pdev->dev, "Missing _DSM\n"); 554 return -ENODEV; 555 } 556 557 pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL); 558 if (!pfru_dev) 559 return -ENOMEM; 560 561 ret = ida_alloc(&pfru_ida, GFP_KERNEL); 562 if (ret < 0) 563 return ret; 564 565 pfru_dev->index = ret; 566 ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev); 567 if (ret) 568 return ret; 569 570 pfru_dev->rev_id = PFRU_DEFAULT_REV_ID; 571 pfru_dev->parent_dev = &pdev->dev; 572 573 pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR; 574 pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, 575 "pfru%d", pfru_dev->index); 576 if (!pfru_dev->miscdev.name) 577 return -ENOMEM; 578 579 pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL, 580 "acpi_pfr_update%d", pfru_dev->index); 581 if (!pfru_dev->miscdev.nodename) 582 return -ENOMEM; 583 584 pfru_dev->miscdev.fops = &acpi_pfru_fops; 585 pfru_dev->miscdev.parent = &pdev->dev; 586 587 ret = misc_register(&pfru_dev->miscdev); 588 if (ret) 589 return ret; 590 591 platform_set_drvdata(pdev, pfru_dev); 592 593 return 0; 594 } 595 596 static const struct acpi_device_id acpi_pfru_ids[] = { 597 {"INTC1080"}, 598 {} 599 }; 600 MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids); 601 602 static struct platform_driver acpi_pfru_driver = { 603 .driver = { 604 .name = "pfr_update", 605 .acpi_match_table = acpi_pfru_ids, 606 }, 607 .probe = acpi_pfru_probe, 608 .remove = acpi_pfru_remove, 609 }; 610 module_platform_driver(acpi_pfru_driver); 611 612 MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver"); 613 MODULE_LICENSE("GPL v2"); 614