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 */
is_nvram_char(char c)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
is_whitespace(char c)78 static bool is_whitespace(char c)
79 {
80 return (c == ' ' || c == '\r' || c == '\n' || c == '\t');
81 }
82
brcmf_nvram_handle_idle(struct nvram_parser * nvp)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
brcmf_nvram_handle_key(struct nvram_parser * nvp)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
brcmf_nvram_handle_value(struct nvram_parser * nvp)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
brcmf_nvram_handle_comment(struct nvram_parser * nvp)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
brcmf_nvram_handle_end(struct nvram_parser * nvp)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
brcmf_init_nvram_parser(struct nvram_parser * nvp,const u8 * data,size_t data_len)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 */
brcmf_fw_strip_multi_v1(struct nvram_parser * nvp,u16 domain_nr,u16 bus_nr)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 */
brcmf_fw_strip_multi_v2(struct nvram_parser * nvp,u16 domain_nr,u16 bus_nr)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
brcmf_fw_add_defaults(struct nvram_parser * nvp)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 */
brcmf_fw_nvram_strip(const u8 * data,size_t data_len,u32 * new_length,u16 domain_nr,u16 bus_nr)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
brcmf_fw_nvram_free(void * nvram)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 */
brcmf_fw_fix_efi_nvram_ccode(char * data,unsigned long data_len)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
brcmf_fw_nvram_from_efi(size_t * data_len_ret)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
brcmf_fw_nvram_from_efi(size_t * data_len)504 static inline u8 *brcmf_fw_nvram_from_efi(size_t *data_len) { return NULL; }
505 #endif
506
brcmf_fw_free_request(struct brcmf_fw_request * req)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
brcmf_fw_request_nvram_done(const struct firmware * fw,void * ctx)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
brcmf_fw_complete_request(const struct firmware * fw,struct brcmf_fw * fwctx)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
brcmf_fw_request_firmware(const struct firmware ** fw,struct brcmf_fw * fwctx)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
brcmf_fw_request_done(const struct firmware * fw,void * ctx)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
brcmf_fw_request_is_valid(struct brcmf_fw_request * req)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
brcmf_fw_get_firmwares(struct device * dev,struct brcmf_fw_request * req,void (* fw_cb)(struct device * dev,int err,struct brcmf_fw_request * req))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 *
brcmf_fw_alloc_request(u32 chip,u32 chiprev,const struct brcmf_firmware_mapping mapping_table[],u32 table_size,struct brcmf_fw_name * fwnames,u32 n_fwnames)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