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 25 enum 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 */ 48 struct 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 */ 68 static 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 78 static bool is_whitespace(char c) 79 { 80 return (c == ' ' || c == '\r' || c == '\n' || c == '\t'); 81 } 82 83 static 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); 100 proceed: 101 nvp->column++; 102 nvp->pos++; 103 return IDLE; 104 } 105 106 static 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 } 134 135 static enum nvram_parser_state 136 brcmf_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 } 162 163 static enum nvram_parser_state 164 brcmf_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 } 182 183 static enum nvram_parser_state brcmf_nvram_handle_end(struct nvram_parser *nvp) 184 { 185 /* final state */ 186 return END; 187 } 188 189 static 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 }; 197 198 static 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 /* Alloc for extra 0 byte + roundup by 4 + length field */ 211 size += 1 + 3 + sizeof(u32); 212 nvp->nvram = kzalloc(size, GFP_KERNEL); 213 if (!nvp->nvram) 214 return -ENOMEM; 215 216 nvp->line = 1; 217 nvp->column = 1; 218 return 0; 219 } 220 221 /* brcmf_fw_strip_multi_v1 :Some nvram files contain settings for multiple 222 * devices. Strip it down for one device, use domain_nr/bus_nr to determine 223 * which data is to be returned. v1 is the version where nvram is stored 224 * compressed and "devpath" maps to index for valid entries. 225 */ 226 static void brcmf_fw_strip_multi_v1(struct nvram_parser *nvp, u16 domain_nr, 227 u16 bus_nr) 228 { 229 /* Device path with a leading '=' key-value separator */ 230 char pci_path[] = "=pci/?/?"; 231 size_t pci_len; 232 char pcie_path[] = "=pcie/?/?"; 233 size_t pcie_len; 234 235 u32 i, j; 236 bool found; 237 u8 *nvram; 238 u8 id; 239 240 nvram = kzalloc(nvp->nvram_len + 1 + 3 + sizeof(u32), GFP_KERNEL); 241 if (!nvram) 242 goto fail; 243 244 /* min length: devpath0=pcie/1/4/ + 0:x=y */ 245 if (nvp->nvram_len < BRCMF_FW_NVRAM_DEVPATH_LEN + 6) 246 goto fail; 247 248 /* First search for the devpathX and see if it is the configuration 249 * for domain_nr/bus_nr. Search complete nvp 250 */ 251 snprintf(pci_path, sizeof(pci_path), "=pci/%d/%d", domain_nr, 252 bus_nr); 253 pci_len = strlen(pci_path); 254 snprintf(pcie_path, sizeof(pcie_path), "=pcie/%d/%d", domain_nr, 255 bus_nr); 256 pcie_len = strlen(pcie_path); 257 found = false; 258 i = 0; 259 while (i < nvp->nvram_len - BRCMF_FW_NVRAM_DEVPATH_LEN) { 260 /* Format: devpathX=pcie/Y/Z/ 261 * Y = domain_nr, Z = bus_nr, X = virtual ID 262 */ 263 if (strncmp(&nvp->nvram[i], "devpath", 7) == 0 && 264 (!strncmp(&nvp->nvram[i + 8], pci_path, pci_len) || 265 !strncmp(&nvp->nvram[i + 8], pcie_path, pcie_len))) { 266 id = nvp->nvram[i + 7] - '0'; 267 found = true; 268 break; 269 } 270 while (nvp->nvram[i] != 0) 271 i++; 272 i++; 273 } 274 if (!found) 275 goto fail; 276 277 /* Now copy all valid entries, release old nvram and assign new one */ 278 i = 0; 279 j = 0; 280 while (i < nvp->nvram_len) { 281 if ((nvp->nvram[i] - '0' == id) && (nvp->nvram[i + 1] == ':')) { 282 i += 2; 283 if (strncmp(&nvp->nvram[i], "boardrev", 8) == 0) 284 nvp->boardrev_found = true; 285 while (nvp->nvram[i] != 0) { 286 nvram[j] = nvp->nvram[i]; 287 i++; 288 j++; 289 } 290 nvram[j] = 0; 291 j++; 292 } 293 while (nvp->nvram[i] != 0) 294 i++; 295 i++; 296 } 297 kfree(nvp->nvram); 298 nvp->nvram = nvram; 299 nvp->nvram_len = j; 300 return; 301 302 fail: 303 kfree(nvram); 304 nvp->nvram_len = 0; 305 } 306 307 /* brcmf_fw_strip_multi_v2 :Some nvram files contain settings for multiple 308 * devices. Strip it down for one device, use domain_nr/bus_nr to determine 309 * which data is to be returned. v2 is the version where nvram is stored 310 * uncompressed, all relevant valid entries are identified by 311 * pcie/domain_nr/bus_nr: 312 */ 313 static void brcmf_fw_strip_multi_v2(struct nvram_parser *nvp, u16 domain_nr, 314 u16 bus_nr) 315 { 316 char prefix[BRCMF_FW_NVRAM_PCIEDEV_LEN]; 317 size_t len; 318 u32 i, j; 319 u8 *nvram; 320 321 nvram = kzalloc(nvp->nvram_len + 1 + 3 + sizeof(u32), GFP_KERNEL); 322 if (!nvram) 323 goto fail; 324 325 /* Copy all valid entries, release old nvram and assign new one. 326 * Valid entries are of type pcie/X/Y/ where X = domain_nr and 327 * Y = bus_nr. 328 */ 329 snprintf(prefix, sizeof(prefix), "pcie/%d/%d/", domain_nr, bus_nr); 330 len = strlen(prefix); 331 i = 0; 332 j = 0; 333 while (i < nvp->nvram_len - len) { 334 if (strncmp(&nvp->nvram[i], prefix, len) == 0) { 335 i += len; 336 if (strncmp(&nvp->nvram[i], "boardrev", 8) == 0) 337 nvp->boardrev_found = true; 338 while (nvp->nvram[i] != 0) { 339 nvram[j] = nvp->nvram[i]; 340 i++; 341 j++; 342 } 343 nvram[j] = 0; 344 j++; 345 } 346 while (nvp->nvram[i] != 0) 347 i++; 348 i++; 349 } 350 kfree(nvp->nvram); 351 nvp->nvram = nvram; 352 nvp->nvram_len = j; 353 return; 354 fail: 355 kfree(nvram); 356 nvp->nvram_len = 0; 357 } 358 359 static void brcmf_fw_add_defaults(struct nvram_parser *nvp) 360 { 361 if (nvp->boardrev_found) 362 return; 363 364 memcpy(&nvp->nvram[nvp->nvram_len], &BRCMF_FW_DEFAULT_BOARDREV, 365 strlen(BRCMF_FW_DEFAULT_BOARDREV)); 366 nvp->nvram_len += strlen(BRCMF_FW_DEFAULT_BOARDREV); 367 nvp->nvram[nvp->nvram_len] = '\0'; 368 nvp->nvram_len++; 369 } 370 371 /* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a fil 372 * and ending in a NUL. Removes carriage returns, empty lines, comment lines, 373 * and converts newlines to NULs. Shortens buffer as needed and pads with NULs. 374 * End of buffer is completed with token identifying length of buffer. 375 */ 376 static void *brcmf_fw_nvram_strip(const u8 *data, size_t data_len, 377 u32 *new_length, u16 domain_nr, u16 bus_nr) 378 { 379 struct nvram_parser nvp; 380 u32 pad; 381 u32 token; 382 __le32 token_le; 383 384 if (brcmf_init_nvram_parser(&nvp, data, data_len) < 0) 385 return NULL; 386 387 while (nvp.pos < data_len) { 388 nvp.state = nv_parser_states[nvp.state](&nvp); 389 if (nvp.state == END) 390 break; 391 } 392 if (nvp.multi_dev_v1) { 393 nvp.boardrev_found = false; 394 brcmf_fw_strip_multi_v1(&nvp, domain_nr, bus_nr); 395 } else if (nvp.multi_dev_v2) { 396 nvp.boardrev_found = false; 397 brcmf_fw_strip_multi_v2(&nvp, domain_nr, bus_nr); 398 } 399 400 if (nvp.nvram_len == 0) { 401 kfree(nvp.nvram); 402 return NULL; 403 } 404 405 brcmf_fw_add_defaults(&nvp); 406 407 pad = nvp.nvram_len; 408 *new_length = roundup(nvp.nvram_len + 1, 4); 409 while (pad != *new_length) { 410 nvp.nvram[pad] = 0; 411 pad++; 412 } 413 414 token = *new_length / 4; 415 token = (~token << 16) | (token & 0x0000FFFF); 416 token_le = cpu_to_le32(token); 417 418 memcpy(&nvp.nvram[*new_length], &token_le, sizeof(token_le)); 419 *new_length += sizeof(token_le); 420 421 return nvp.nvram; 422 } 423 424 void brcmf_fw_nvram_free(void *nvram) 425 { 426 kfree(nvram); 427 } 428 429 struct brcmf_fw { 430 struct device *dev; 431 struct brcmf_fw_request *req; 432 u32 curpos; 433 void (*done)(struct device *dev, int err, struct brcmf_fw_request *req); 434 }; 435 436 static void brcmf_fw_request_done(const struct firmware *fw, void *ctx); 437 438 #ifdef CONFIG_EFI 439 /* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV" 440 * to specify "worldwide" compatible settings, but these 2 ccode-s do not work 441 * properly. "ccode=ALL" causes channels 12 and 13 to not be available, 442 * "ccode=XV" causes all 5GHz channels to not be available. So we replace both 443 * with "ccode=X2" which allows channels 12+13 and 5Ghz channels in 444 * no-Initiate-Radiation mode. This means that we will never send on these 445 * channels without first having received valid wifi traffic on the channel. 446 */ 447 static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len) 448 { 449 char *ccode; 450 451 ccode = strnstr((char *)data, "ccode=ALL", data_len); 452 if (!ccode) 453 ccode = strnstr((char *)data, "ccode=XV\r", data_len); 454 if (!ccode) 455 return; 456 457 ccode[6] = 'X'; 458 ccode[7] = '2'; 459 ccode[8] = '\r'; 460 } 461 462 static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret) 463 { 464 const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 }; 465 struct efivar_entry *nvram_efivar; 466 unsigned long data_len = 0; 467 u8 *data = NULL; 468 int err; 469 470 nvram_efivar = kzalloc(sizeof(*nvram_efivar), GFP_KERNEL); 471 if (!nvram_efivar) 472 return NULL; 473 474 memcpy(&nvram_efivar->var.VariableName, name, sizeof(name)); 475 nvram_efivar->var.VendorGuid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61, 476 0xb5, 0x1f, 0x43, 0x26, 477 0x81, 0x23, 0xd1, 0x13); 478 479 err = efivar_entry_size(nvram_efivar, &data_len); 480 if (err) 481 goto fail; 482 483 data = kmalloc(data_len, GFP_KERNEL); 484 if (!data) 485 goto fail; 486 487 err = efivar_entry_get(nvram_efivar, NULL, &data_len, data); 488 if (err) 489 goto fail; 490 491 brcmf_fw_fix_efi_nvram_ccode(data, data_len); 492 brcmf_info("Using nvram EFI variable\n"); 493 494 kfree(nvram_efivar); 495 *data_len_ret = data_len; 496 return data; 497 498 fail: 499 kfree(data); 500 kfree(nvram_efivar); 501 return NULL; 502 } 503 #else 504 static inline u8 *brcmf_fw_nvram_from_efi(size_t *data_len) { return NULL; } 505 #endif 506 507 static void brcmf_fw_free_request(struct brcmf_fw_request *req) 508 { 509 struct brcmf_fw_item *item; 510 int i; 511 512 for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) { 513 if (item->type == BRCMF_FW_TYPE_BINARY) 514 release_firmware(item->binary); 515 else if (item->type == BRCMF_FW_TYPE_NVRAM) 516 brcmf_fw_nvram_free(item->nv_data.data); 517 } 518 kfree(req); 519 } 520 521 static int brcmf_fw_request_nvram_done(const struct firmware *fw, void *ctx) 522 { 523 struct brcmf_fw *fwctx = ctx; 524 struct brcmf_fw_item *cur; 525 bool free_bcm47xx_nvram = false; 526 bool kfree_nvram = false; 527 u32 nvram_length = 0; 528 void *nvram = NULL; 529 u8 *data = NULL; 530 size_t data_len; 531 532 brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev)); 533 534 cur = &fwctx->req->items[fwctx->curpos]; 535 536 if (fw && fw->data) { 537 data = (u8 *)fw->data; 538 data_len = fw->size; 539 } else { 540 if ((data = bcm47xx_nvram_get_contents(&data_len))) 541 free_bcm47xx_nvram = true; 542 else if ((data = brcmf_fw_nvram_from_efi(&data_len))) 543 kfree_nvram = true; 544 else if (!(cur->flags & BRCMF_FW_REQF_OPTIONAL)) 545 goto fail; 546 } 547 548 if (data) 549 nvram = brcmf_fw_nvram_strip(data, data_len, &nvram_length, 550 fwctx->req->domain_nr, 551 fwctx->req->bus_nr); 552 553 if (free_bcm47xx_nvram) 554 bcm47xx_nvram_release_contents(data); 555 if (kfree_nvram) 556 kfree(data); 557 558 release_firmware(fw); 559 if (!nvram && !(cur->flags & BRCMF_FW_REQF_OPTIONAL)) 560 goto fail; 561 562 brcmf_dbg(TRACE, "nvram %p len %d\n", nvram, nvram_length); 563 cur->nv_data.data = nvram; 564 cur->nv_data.len = nvram_length; 565 return 0; 566 567 fail: 568 return -ENOENT; 569 } 570 571 static int brcmf_fw_complete_request(const struct firmware *fw, 572 struct brcmf_fw *fwctx) 573 { 574 struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; 575 int ret = 0; 576 577 brcmf_dbg(TRACE, "firmware %s %sfound\n", cur->path, fw ? "" : "not "); 578 579 switch (cur->type) { 580 case BRCMF_FW_TYPE_NVRAM: 581 ret = brcmf_fw_request_nvram_done(fw, fwctx); 582 break; 583 case BRCMF_FW_TYPE_BINARY: 584 if (fw) 585 cur->binary = fw; 586 else 587 ret = -ENOENT; 588 break; 589 default: 590 /* something fishy here so bail out early */ 591 brcmf_err("unknown fw type: %d\n", cur->type); 592 release_firmware(fw); 593 ret = -EINVAL; 594 } 595 596 return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret; 597 } 598 599 static int brcmf_fw_request_firmware(const struct firmware **fw, 600 struct brcmf_fw *fwctx) 601 { 602 struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; 603 int ret; 604 605 /* nvram files are board-specific, first try a board-specific path */ 606 if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) { 607 char alt_path[BRCMF_FW_NAME_LEN]; 608 609 strlcpy(alt_path, cur->path, BRCMF_FW_NAME_LEN); 610 /* strip .txt at the end */ 611 alt_path[strlen(alt_path) - 4] = 0; 612 strlcat(alt_path, ".", BRCMF_FW_NAME_LEN); 613 strlcat(alt_path, fwctx->req->board_type, BRCMF_FW_NAME_LEN); 614 strlcat(alt_path, ".txt", BRCMF_FW_NAME_LEN); 615 616 ret = request_firmware(fw, alt_path, fwctx->dev); 617 if (ret == 0) 618 return ret; 619 } 620 621 return request_firmware(fw, cur->path, fwctx->dev); 622 } 623 624 static void brcmf_fw_request_done(const struct firmware *fw, void *ctx) 625 { 626 struct brcmf_fw *fwctx = ctx; 627 int ret; 628 629 ret = brcmf_fw_complete_request(fw, fwctx); 630 631 while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) { 632 brcmf_fw_request_firmware(&fw, fwctx); 633 ret = brcmf_fw_complete_request(fw, ctx); 634 } 635 636 if (ret) { 637 brcmf_fw_free_request(fwctx->req); 638 fwctx->req = NULL; 639 } 640 fwctx->done(fwctx->dev, ret, fwctx->req); 641 kfree(fwctx); 642 } 643 644 static bool brcmf_fw_request_is_valid(struct brcmf_fw_request *req) 645 { 646 struct brcmf_fw_item *item; 647 int i; 648 649 if (!req->n_items) 650 return false; 651 652 for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) { 653 if (!item->path) 654 return false; 655 } 656 return true; 657 } 658 659 int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, 660 void (*fw_cb)(struct device *dev, int err, 661 struct brcmf_fw_request *req)) 662 { 663 struct brcmf_fw_item *first = &req->items[0]; 664 struct brcmf_fw *fwctx; 665 int ret; 666 667 brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev)); 668 if (!fw_cb) 669 return -EINVAL; 670 671 if (!brcmf_fw_request_is_valid(req)) 672 return -EINVAL; 673 674 fwctx = kzalloc(sizeof(*fwctx), GFP_KERNEL); 675 if (!fwctx) 676 return -ENOMEM; 677 678 fwctx->dev = dev; 679 fwctx->req = req; 680 fwctx->done = fw_cb; 681 682 ret = request_firmware_nowait(THIS_MODULE, true, first->path, 683 fwctx->dev, GFP_KERNEL, fwctx, 684 brcmf_fw_request_done); 685 if (ret < 0) 686 brcmf_fw_request_done(NULL, fwctx); 687 688 return 0; 689 } 690 691 struct brcmf_fw_request * 692 brcmf_fw_alloc_request(u32 chip, u32 chiprev, 693 const struct brcmf_firmware_mapping mapping_table[], 694 u32 table_size, struct brcmf_fw_name *fwnames, 695 u32 n_fwnames) 696 { 697 struct brcmf_fw_request *fwreq; 698 char chipname[12]; 699 const char *mp_path; 700 size_t mp_path_len; 701 u32 i, j; 702 char end = '\0'; 703 704 for (i = 0; i < table_size; i++) { 705 if (mapping_table[i].chipid == chip && 706 mapping_table[i].revmask & BIT(chiprev)) 707 break; 708 } 709 710 brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname)); 711 712 if (i == table_size) { 713 brcmf_err("Unknown chip %s\n", chipname); 714 return NULL; 715 } 716 717 fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL); 718 if (!fwreq) 719 return NULL; 720 721 brcmf_info("using %s for chip %s\n", 722 mapping_table[i].fw_base, chipname); 723 724 mp_path = brcmf_mp_global.firmware_path; 725 mp_path_len = strnlen(mp_path, BRCMF_FW_ALTPATH_LEN); 726 if (mp_path_len) 727 end = mp_path[mp_path_len - 1]; 728 729 fwreq->n_items = n_fwnames; 730 731 for (j = 0; j < n_fwnames; j++) { 732 fwreq->items[j].path = fwnames[j].path; 733 fwnames[j].path[0] = '\0'; 734 /* check if firmware path is provided by module parameter */ 735 if (brcmf_mp_global.firmware_path[0] != '\0') { 736 strlcpy(fwnames[j].path, mp_path, 737 BRCMF_FW_NAME_LEN); 738 739 if (end != '/') { 740 strlcat(fwnames[j].path, "/", 741 BRCMF_FW_NAME_LEN); 742 } 743 } 744 strlcat(fwnames[j].path, mapping_table[i].fw_base, 745 BRCMF_FW_NAME_LEN); 746 strlcat(fwnames[j].path, fwnames[j].extension, 747 BRCMF_FW_NAME_LEN); 748 fwreq->items[j].path = fwnames[j].path; 749 } 750 751 return fwreq; 752 } 753