1// SPDX-License-Identifier: ISC 2/* 3 * Copyright (c) 2013 Broadcom Corporation 4 */ 5 6#include <linux/efi.h> 7#include <linux/kernel.h> 8#include <linux/slab.h> 9#include <linux/device.h> 10#include <linux/firmware.h> 11#include <linux/module.h> 12#include <linux/bcm47xx_nvram.h> 13 14#include "debug.h" 15#include "firmware.h" 16#include "core.h" 17#include "common.h" 18#include "chip.h" 19 20#define BRCMF_FW_MAX_NVRAM_SIZE 64000 21#define BRCMF_FW_NVRAM_DEVPATH_LEN 19 /* devpath0=pcie/1/4/ */ 22#define BRCMF_FW_NVRAM_PCIEDEV_LEN 10 /* pcie/1/4/ + \0 */ 23#define BRCMF_FW_DEFAULT_BOARDREV "boardrev=0xff" 24 25enum nvram_parser_state { 26 IDLE, 27 KEY, 28 VALUE, 29 COMMENT, 30 END 31}; 32 33/** 34 * struct nvram_parser - internal info for parser. 35 * 36 * @state: current parser state. 37 * @data: input buffer being parsed. 38 * @nvram: output buffer with parse result. 39 * @nvram_len: length of parse result. 40 * @line: current line. 41 * @column: current column in line. 42 * @pos: byte offset in input buffer. 43 * @entry: start position of key,value entry. 44 * @multi_dev_v1: detect pcie multi device v1 (compressed). 45 * @multi_dev_v2: detect pcie multi device v2. 46 * @boardrev_found: nvram contains boardrev information. 47 */ 48struct nvram_parser { 49 enum nvram_parser_state state; 50 const u8 *data; 51 u8 *nvram; 52 u32 nvram_len; 53 u32 line; 54 u32 column; 55 u32 pos; 56 u32 entry; 57 bool multi_dev_v1; 58 bool multi_dev_v2; 59 bool boardrev_found; 60}; 61 62/* 63 * is_nvram_char() - check if char is a valid one for NVRAM entry 64 * 65 * It accepts all printable ASCII chars except for '#' which opens a comment. 66 * Please note that ' ' (space) while accepted is not a valid key name char. 67 */ 68static bool is_nvram_char(char c) 69{ 70 /* comment marker excluded */ 71 if (c == '#') 72 return false; 73 74 /* key and value may have any other readable character */ 75 return (c >= 0x20 && c < 0x7f); 76} 77 78static bool is_whitespace(char c) 79{ 80 return (c == ' ' || c == '\r' || c == '\n' || c == '\t'); 81} 82 83static enum nvram_parser_state brcmf_nvram_handle_idle(struct nvram_parser *nvp) 84{ 85 char c; 86 87 c = nvp->data[nvp->pos]; 88 if (c == '\n') 89 return COMMENT; 90 if (is_whitespace(c) || c == '\0') 91 goto proceed; 92 if (c == '#') 93 return COMMENT; 94 if (is_nvram_char(c)) { 95 nvp->entry = nvp->pos; 96 return KEY; 97 } 98 brcmf_dbg(INFO, "warning: ln=%d:col=%d: ignoring invalid character\n", 99 nvp->line, nvp->column); 100proceed: 101 nvp->column++; 102 nvp->pos++; 103 return IDLE; 104} 105 106static enum nvram_parser_state brcmf_nvram_handle_key(struct nvram_parser *nvp) 107{ 108 enum nvram_parser_state st = nvp->state; 109 char c; 110 111 c = nvp->data[nvp->pos]; 112 if (c == '=') { 113 /* ignore RAW1 by treating as comment */ 114 if (strncmp(&nvp->data[nvp->entry], "RAW1", 4) == 0) 115 st = COMMENT; 116 else 117 st = VALUE; 118 if (strncmp(&nvp->data[nvp->entry], "devpath", 7) == 0) 119 nvp->multi_dev_v1 = true; 120 if (strncmp(&nvp->data[nvp->entry], "pcie/", 5) == 0) 121 nvp->multi_dev_v2 = true; 122 if (strncmp(&nvp->data[nvp->entry], "boardrev", 8) == 0) 123 nvp->boardrev_found = true; 124 } else if (!is_nvram_char(c) || c == ' ') { 125 brcmf_dbg(INFO, "warning: ln=%d:col=%d: '=' expected, skip invalid key entry\n", 126 nvp->line, nvp->column); 127 return COMMENT; 128 } 129 130 nvp->column++; 131 nvp->pos++; 132 return st; 133} 134 135static enum nvram_parser_state 136brcmf_nvram_handle_value(struct nvram_parser *nvp) 137{ 138 char c; 139 char *skv; 140 char *ekv; 141 u32 cplen; 142 143 c = nvp->data[nvp->pos]; 144 if (!is_nvram_char(c)) { 145 /* key,value pair complete */ 146 ekv = (u8 *)&nvp->data[nvp->pos]; 147 skv = (u8 *)&nvp->data[nvp->entry]; 148 cplen = ekv - skv; 149 if (nvp->nvram_len + cplen + 1 >= BRCMF_FW_MAX_NVRAM_SIZE) 150 return END; 151 /* copy to output buffer */ 152 memcpy(&nvp->nvram[nvp->nvram_len], skv, cplen); 153 nvp->nvram_len += cplen; 154 nvp->nvram[nvp->nvram_len] = '\0'; 155 nvp->nvram_len++; 156 return IDLE; 157 } 158 nvp->pos++; 159 nvp->column++; 160 return VALUE; 161} 162 163static enum nvram_parser_state 164brcmf_nvram_handle_comment(struct nvram_parser *nvp) 165{ 166 char *eoc, *sol; 167 168 sol = (char *)&nvp->data[nvp->pos]; 169 eoc = strchr(sol, '\n'); 170 if (!eoc) { 171 eoc = strchr(sol, '\0'); 172 if (!eoc) 173 return END; 174 } 175 176 /* eat all moving to next line */ 177 nvp->line++; 178 nvp->column = 1; 179 nvp->pos += (eoc - sol) + 1; 180 return IDLE; 181} 182 183static enum nvram_parser_state brcmf_nvram_handle_end(struct nvram_parser *nvp) 184{ 185 /* final state */ 186 return END; 187} 188 189static enum nvram_parser_state 190(*nv_parser_states[])(struct nvram_parser *nvp) = { 191 brcmf_nvram_handle_idle, 192 brcmf_nvram_handle_key, 193 brcmf_nvram_handle_value, 194 brcmf_nvram_handle_comment, 195 brcmf_nvram_handle_end 196}; 197 198static int brcmf_init_nvram_parser(struct nvram_parser *nvp, 199 const u8 *data, size_t data_len) 200{ 201 size_t size; 202 203 memset(nvp, 0, sizeof(*nvp)); 204 nvp->data = data; 205 /* Limit size to MAX_NVRAM_SIZE, some files contain lot of comment */ 206 if (data_len > BRCMF_FW_MAX_NVRAM_SIZE) 207 size = BRCMF_FW_MAX_NVRAM_SIZE; 208 else 209 size = data_len; 210 /* Add space for properties we may add */ 211 size += strlen(BRCMF_FW_DEFAULT_BOARDREV) + 1; 212 /* Alloc for extra 0 byte + roundup by 4 + length field */ 213 size += 1 + 3 + sizeof(u32); 214 nvp->nvram = kzalloc(size, GFP_KERNEL); 215 if (!nvp->nvram) 216 return -ENOMEM; 217 218 nvp->line = 1; 219 nvp->column = 1; 220 return 0; 221} 222 223/* brcmf_fw_strip_multi_v1 :Some nvram files contain settings for multiple 224 * devices. Strip it down for one device, use domain_nr/bus_nr to determine 225 * which data is to be returned. v1 is the version where nvram is stored 226 * compressed and "devpath" maps to index for valid entries. 227 */ 228static void brcmf_fw_strip_multi_v1(struct nvram_parser *nvp, u16 domain_nr, 229 u16 bus_nr) 230{ 231 /* Device path with a leading '=' key-value separator */ 232 char pci_path[] = "=pci/?/?"; 233 size_t pci_len; 234 char pcie_path[] = "=pcie/?/?"; 235 size_t pcie_len; 236 237 u32 i, j; 238 bool found; 239 u8 *nvram; 240 u8 id; 241 242 nvram = kzalloc(nvp->nvram_len + 1 + 3 + sizeof(u32), GFP_KERNEL); 243 if (!nvram) 244 goto fail; 245 246 /* min length: devpath0=pcie/1/4/ + 0:x=y */ 247 if (nvp->nvram_len < BRCMF_FW_NVRAM_DEVPATH_LEN + 6) 248 goto fail; 249 250 /* First search for the devpathX and see if it is the configuration 251 * for domain_nr/bus_nr. Search complete nvp 252 */ 253 snprintf(pci_path, sizeof(pci_path), "=pci/%d/%d", domain_nr, 254 bus_nr); 255 pci_len = strlen(pci_path); 256 snprintf(pcie_path, sizeof(pcie_path), "=pcie/%d/%d", domain_nr, 257 bus_nr); 258 pcie_len = strlen(pcie_path); 259 found = false; 260 i = 0; 261 while (i < nvp->nvram_len - BRCMF_FW_NVRAM_DEVPATH_LEN) { 262 /* Format: devpathX=pcie/Y/Z/ 263 * Y = domain_nr, Z = bus_nr, X = virtual ID 264 */ 265 if (strncmp(&nvp->nvram[i], "devpath", 7) == 0 && 266 (!strncmp(&nvp->nvram[i + 8], pci_path, pci_len) || 267 !strncmp(&nvp->nvram[i + 8], pcie_path, pcie_len))) { 268 id = nvp->nvram[i + 7] - '0'; 269 found = true; 270 break; 271 } 272 while (nvp->nvram[i] != 0) 273 i++; 274 i++; 275 } 276 if (!found) 277 goto fail; 278 279 /* Now copy all valid entries, release old nvram and assign new one */ 280 i = 0; 281 j = 0; 282 while (i < nvp->nvram_len) { 283 if ((nvp->nvram[i] - '0' == id) && (nvp->nvram[i + 1] == ':')) { 284 i += 2; 285 if (strncmp(&nvp->nvram[i], "boardrev", 8) == 0) 286 nvp->boardrev_found = true; 287 while (nvp->nvram[i] != 0) { 288 nvram[j] = nvp->nvram[i]; 289 i++; 290 j++; 291 } 292 nvram[j] = 0; 293 j++; 294 } 295 while (nvp->nvram[i] != 0) 296 i++; 297 i++; 298 } 299 kfree(nvp->nvram); 300 nvp->nvram = nvram; 301 nvp->nvram_len = j; 302 return; 303 304fail: 305 kfree(nvram); 306 nvp->nvram_len = 0; 307} 308 309/* brcmf_fw_strip_multi_v2 :Some nvram files contain settings for multiple 310 * devices. Strip it down for one device, use domain_nr/bus_nr to determine 311 * which data is to be returned. v2 is the version where nvram is stored 312 * uncompressed, all relevant valid entries are identified by 313 * pcie/domain_nr/bus_nr: 314 */ 315static void brcmf_fw_strip_multi_v2(struct nvram_parser *nvp, u16 domain_nr, 316 u16 bus_nr) 317{ 318 char prefix[BRCMF_FW_NVRAM_PCIEDEV_LEN]; 319 size_t len; 320 u32 i, j; 321 u8 *nvram; 322 323 nvram = kzalloc(nvp->nvram_len + 1 + 3 + sizeof(u32), GFP_KERNEL); 324 if (!nvram) 325 goto fail; 326 327 /* Copy all valid entries, release old nvram and assign new one. 328 * Valid entries are of type pcie/X/Y/ where X = domain_nr and 329 * Y = bus_nr. 330 */ 331 snprintf(prefix, sizeof(prefix), "pcie/%d/%d/", domain_nr, bus_nr); 332 len = strlen(prefix); 333 i = 0; 334 j = 0; 335 while (i < nvp->nvram_len - len) { 336 if (strncmp(&nvp->nvram[i], prefix, len) == 0) { 337 i += len; 338 if (strncmp(&nvp->nvram[i], "boardrev", 8) == 0) 339 nvp->boardrev_found = true; 340 while (nvp->nvram[i] != 0) { 341 nvram[j] = nvp->nvram[i]; 342 i++; 343 j++; 344 } 345 nvram[j] = 0; 346 j++; 347 } 348 while (nvp->nvram[i] != 0) 349 i++; 350 i++; 351 } 352 kfree(nvp->nvram); 353 nvp->nvram = nvram; 354 nvp->nvram_len = j; 355 return; 356fail: 357 kfree(nvram); 358 nvp->nvram_len = 0; 359} 360 361static void brcmf_fw_add_defaults(struct nvram_parser *nvp) 362{ 363 if (nvp->boardrev_found) 364 return; 365 366 memcpy(&nvp->nvram[nvp->nvram_len], &BRCMF_FW_DEFAULT_BOARDREV, 367 strlen(BRCMF_FW_DEFAULT_BOARDREV)); 368 nvp->nvram_len += strlen(BRCMF_FW_DEFAULT_BOARDREV); 369 nvp->nvram[nvp->nvram_len] = '\0'; 370 nvp->nvram_len++; 371} 372 373/* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a fil 374 * and ending in a NUL. Removes carriage returns, empty lines, comment lines, 375 * and converts newlines to NULs. Shortens buffer as needed and pads with NULs. 376 * End of buffer is completed with token identifying length of buffer. 377 */ 378static void *brcmf_fw_nvram_strip(const u8 *data, size_t data_len, 379 u32 *new_length, u16 domain_nr, u16 bus_nr) 380{ 381 struct nvram_parser nvp; 382 u32 pad; 383 u32 token; 384 __le32 token_le; 385 386 if (brcmf_init_nvram_parser(&nvp, data, data_len) < 0) 387 return NULL; 388 389 while (nvp.pos < data_len) { 390 nvp.state = nv_parser_states[nvp.state](&nvp); 391 if (nvp.state == END) 392 break; 393 } 394 if (nvp.multi_dev_v1) { 395 nvp.boardrev_found = false; 396 brcmf_fw_strip_multi_v1(&nvp, domain_nr, bus_nr); 397 } else if (nvp.multi_dev_v2) { 398 nvp.boardrev_found = false; 399 brcmf_fw_strip_multi_v2(&nvp, domain_nr, bus_nr); 400 } 401 402 if (nvp.nvram_len == 0) { 403 kfree(nvp.nvram); 404 return NULL; 405 } 406 407 brcmf_fw_add_defaults(&nvp); 408 409 pad = nvp.nvram_len; 410 *new_length = roundup(nvp.nvram_len + 1, 4); 411 while (pad != *new_length) { 412 nvp.nvram[pad] = 0; 413 pad++; 414 } 415 416 token = *new_length / 4; 417 token = (~token << 16) | (token & 0x0000FFFF); 418 token_le = cpu_to_le32(token); 419 420 memcpy(&nvp.nvram[*new_length], &token_le, sizeof(token_le)); 421 *new_length += sizeof(token_le); 422 423 return nvp.nvram; 424} 425 426void brcmf_fw_nvram_free(void *nvram) 427{ 428 kfree(nvram); 429} 430 431struct brcmf_fw { 432 struct device *dev; 433 struct brcmf_fw_request *req; 434 u32 curpos; 435 void (*done)(struct device *dev, int err, struct brcmf_fw_request *req); 436}; 437 438static void brcmf_fw_request_done(const struct firmware *fw, void *ctx); 439 440#ifdef CONFIG_EFI 441/* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV" 442 * to specify "worldwide" compatible settings, but these 2 ccode-s do not work 443 * properly. "ccode=ALL" causes channels 12 and 13 to not be available, 444 * "ccode=XV" causes all 5GHz channels to not be available. So we replace both 445 * with "ccode=X2" which allows channels 12+13 and 5Ghz channels in 446 * no-Initiate-Radiation mode. This means that we will never send on these 447 * channels without first having received valid wifi traffic on the channel. 448 */ 449static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len) 450{ 451 char *ccode; 452 453 ccode = strnstr((char *)data, "ccode=ALL", data_len); 454 if (!ccode) 455 ccode = strnstr((char *)data, "ccode=XV\r", data_len); 456 if (!ccode) 457 return; 458 459 ccode[6] = 'X'; 460 ccode[7] = '2'; 461 ccode[8] = '\r'; 462} 463 464static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret) 465{ 466 const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 }; 467 struct efivar_entry *nvram_efivar; 468 unsigned long data_len = 0; 469 u8 *data = NULL; 470 int err; 471 472 nvram_efivar = kzalloc(sizeof(*nvram_efivar), GFP_KERNEL); 473 if (!nvram_efivar) 474 return NULL; 475 476 memcpy(&nvram_efivar->var.VariableName, name, sizeof(name)); 477 nvram_efivar->var.VendorGuid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61, 478 0xb5, 0x1f, 0x43, 0x26, 479 0x81, 0x23, 0xd1, 0x13); 480 481 err = efivar_entry_size(nvram_efivar, &data_len); 482 if (err) 483 goto fail; 484 485 data = kmalloc(data_len, GFP_KERNEL); 486 if (!data) 487 goto fail; 488 489 err = efivar_entry_get(nvram_efivar, NULL, &data_len, data); 490 if (err) 491 goto fail; 492 493 brcmf_fw_fix_efi_nvram_ccode(data, data_len); 494 brcmf_info("Using nvram EFI variable\n"); 495 496 kfree(nvram_efivar); 497 *data_len_ret = data_len; 498 return data; 499 500fail: 501 kfree(data); 502 kfree(nvram_efivar); 503 return NULL; 504} 505#else 506static inline u8 *brcmf_fw_nvram_from_efi(size_t *data_len) { return NULL; } 507#endif 508 509static void brcmf_fw_free_request(struct brcmf_fw_request *req) 510{ 511 struct brcmf_fw_item *item; 512 int i; 513 514 for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) { 515 if (item->type == BRCMF_FW_TYPE_BINARY) 516 release_firmware(item->binary); 517 else if (item->type == BRCMF_FW_TYPE_NVRAM) 518 brcmf_fw_nvram_free(item->nv_data.data); 519 } 520 kfree(req); 521} 522 523static int brcmf_fw_request_nvram_done(const struct firmware *fw, void *ctx) 524{ 525 struct brcmf_fw *fwctx = ctx; 526 struct brcmf_fw_item *cur; 527 bool free_bcm47xx_nvram = false; 528 bool kfree_nvram = false; 529 u32 nvram_length = 0; 530 void *nvram = NULL; 531 u8 *data = NULL; 532 size_t data_len; 533 534 brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev)); 535 536 cur = &fwctx->req->items[fwctx->curpos]; 537 538 if (fw && fw->data) { 539 data = (u8 *)fw->data; 540 data_len = fw->size; 541 } else { 542 if ((data = bcm47xx_nvram_get_contents(&data_len))) 543 free_bcm47xx_nvram = true; 544 else if ((data = brcmf_fw_nvram_from_efi(&data_len))) 545 kfree_nvram = true; 546 else if (!(cur->flags & BRCMF_FW_REQF_OPTIONAL)) 547 goto fail; 548 } 549 550 if (data) 551 nvram = brcmf_fw_nvram_strip(data, data_len, &nvram_length, 552 fwctx->req->domain_nr, 553 fwctx->req->bus_nr); 554 555 if (free_bcm47xx_nvram) 556 bcm47xx_nvram_release_contents(data); 557 if (kfree_nvram) 558 kfree(data); 559 560 release_firmware(fw); 561 if (!nvram && !(cur->flags & BRCMF_FW_REQF_OPTIONAL)) 562 goto fail; 563 564 brcmf_dbg(TRACE, "nvram %p len %d\n", nvram, nvram_length); 565 cur->nv_data.data = nvram; 566 cur->nv_data.len = nvram_length; 567 return 0; 568 569fail: 570 return -ENOENT; 571} 572 573static int brcmf_fw_complete_request(const struct firmware *fw, 574 struct brcmf_fw *fwctx) 575{ 576 struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; 577 int ret = 0; 578 579 brcmf_dbg(TRACE, "firmware %s %sfound\n", cur->path, fw ? "" : "not "); 580 581 switch (cur->type) { 582 case BRCMF_FW_TYPE_NVRAM: 583 ret = brcmf_fw_request_nvram_done(fw, fwctx); 584 break; 585 case BRCMF_FW_TYPE_BINARY: 586 if (fw) 587 cur->binary = fw; 588 else 589 ret = -ENOENT; 590 break; 591 default: 592 /* something fishy here so bail out early */ 593 brcmf_err("unknown fw type: %d\n", cur->type); 594 release_firmware(fw); 595 ret = -EINVAL; 596 } 597 598 return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret; 599} 600 601static int brcmf_fw_request_firmware(const struct firmware **fw, 602 struct brcmf_fw *fwctx) 603{ 604 struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; 605 int ret; 606 607 /* nvram files are board-specific, first try a board-specific path */ 608 if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) { 609 char alt_path[BRCMF_FW_NAME_LEN]; 610 611 strlcpy(alt_path, cur->path, BRCMF_FW_NAME_LEN); 612 /* strip .txt at the end */ 613 alt_path[strlen(alt_path) - 4] = 0; 614 strlcat(alt_path, ".", BRCMF_FW_NAME_LEN); 615 strlcat(alt_path, fwctx->req->board_type, BRCMF_FW_NAME_LEN); 616 strlcat(alt_path, ".txt", BRCMF_FW_NAME_LEN); 617 618 ret = request_firmware(fw, alt_path, fwctx->dev); 619 if (ret == 0) 620 return ret; 621 } 622 623 return request_firmware(fw, cur->path, fwctx->dev); 624} 625 626static void brcmf_fw_request_done(const struct firmware *fw, void *ctx) 627{ 628 struct brcmf_fw *fwctx = ctx; 629 int ret; 630 631 ret = brcmf_fw_complete_request(fw, fwctx); 632 633 while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) { 634 brcmf_fw_request_firmware(&fw, fwctx); 635 ret = brcmf_fw_complete_request(fw, ctx); 636 } 637 638 if (ret) { 639 brcmf_fw_free_request(fwctx->req); 640 fwctx->req = NULL; 641 } 642 fwctx->done(fwctx->dev, ret, fwctx->req); 643 kfree(fwctx); 644} 645 646static bool brcmf_fw_request_is_valid(struct brcmf_fw_request *req) 647{ 648 struct brcmf_fw_item *item; 649 int i; 650 651 if (!req->n_items) 652 return false; 653 654 for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) { 655 if (!item->path) 656 return false; 657 } 658 return true; 659} 660 661int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, 662 void (*fw_cb)(struct device *dev, int err, 663 struct brcmf_fw_request *req)) 664{ 665 struct brcmf_fw_item *first = &req->items[0]; 666 struct brcmf_fw *fwctx; 667 int ret; 668 669 brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev)); 670 if (!fw_cb) 671 return -EINVAL; 672 673 if (!brcmf_fw_request_is_valid(req)) 674 return -EINVAL; 675 676 fwctx = kzalloc(sizeof(*fwctx), GFP_KERNEL); 677 if (!fwctx) 678 return -ENOMEM; 679 680 fwctx->dev = dev; 681 fwctx->req = req; 682 fwctx->done = fw_cb; 683 684 ret = request_firmware_nowait(THIS_MODULE, true, first->path, 685 fwctx->dev, GFP_KERNEL, fwctx, 686 brcmf_fw_request_done); 687 if (ret < 0) 688 brcmf_fw_request_done(NULL, fwctx); 689 690 return 0; 691} 692 693struct brcmf_fw_request * 694brcmf_fw_alloc_request(u32 chip, u32 chiprev, 695 const struct brcmf_firmware_mapping mapping_table[], 696 u32 table_size, struct brcmf_fw_name *fwnames, 697 u32 n_fwnames) 698{ 699 struct brcmf_fw_request *fwreq; 700 char chipname[12]; 701 const char *mp_path; 702 size_t mp_path_len; 703 u32 i, j; 704 char end = '\0'; 705 706 if (chiprev >= BITS_PER_TYPE(u32)) { 707 brcmf_err("Invalid chip revision %u\n", chiprev); 708 return NULL; 709 } 710 711 for (i = 0; i < table_size; i++) { 712 if (mapping_table[i].chipid == chip && 713 mapping_table[i].revmask & BIT(chiprev)) 714 break; 715 } 716 717 brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname)); 718 719 if (i == table_size) { 720 brcmf_err("Unknown chip %s\n", chipname); 721 return NULL; 722 } 723 724 fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL); 725 if (!fwreq) 726 return NULL; 727 728 brcmf_info("using %s for chip %s\n", 729 mapping_table[i].fw_base, chipname); 730 731 mp_path = brcmf_mp_global.firmware_path; 732 mp_path_len = strnlen(mp_path, BRCMF_FW_ALTPATH_LEN); 733 if (mp_path_len) 734 end = mp_path[mp_path_len - 1]; 735 736 fwreq->n_items = n_fwnames; 737 738 for (j = 0; j < n_fwnames; j++) { 739 fwreq->items[j].path = fwnames[j].path; 740 fwnames[j].path[0] = '\0'; 741 /* check if firmware path is provided by module parameter */ 742 if (brcmf_mp_global.firmware_path[0] != '\0') { 743 strlcpy(fwnames[j].path, mp_path, 744 BRCMF_FW_NAME_LEN); 745 746 if (end != '/') { 747 strlcat(fwnames[j].path, "/", 748 BRCMF_FW_NAME_LEN); 749 } 750 } 751 strlcat(fwnames[j].path, mapping_table[i].fw_base, 752 BRCMF_FW_NAME_LEN); 753 strlcat(fwnames[j].path, fwnames[j].extension, 754 BRCMF_FW_NAME_LEN); 755 fwreq->items[j].path = fwnames[j].path; 756 } 757 758 return fwreq; 759} 760