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 nvp->nvram_len = 0;
324 return;
325 }
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 }
356
brcmf_fw_add_defaults(struct nvram_parser * nvp)357 static void brcmf_fw_add_defaults(struct nvram_parser *nvp)
358 {
359 if (nvp->boardrev_found)
360 return;
361
362 memcpy(&nvp->nvram[nvp->nvram_len], &BRCMF_FW_DEFAULT_BOARDREV,
363 strlen(BRCMF_FW_DEFAULT_BOARDREV));
364 nvp->nvram_len += strlen(BRCMF_FW_DEFAULT_BOARDREV);
365 nvp->nvram[nvp->nvram_len] = '\0';
366 nvp->nvram_len++;
367 }
368
369 /* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a fil
370 * and ending in a NUL. Removes carriage returns, empty lines, comment lines,
371 * and converts newlines to NULs. Shortens buffer as needed and pads with NULs.
372 * End of buffer is completed with token identifying length of buffer.
373 */
brcmf_fw_nvram_strip(const u8 * data,size_t data_len,u32 * new_length,u16 domain_nr,u16 bus_nr)374 static void *brcmf_fw_nvram_strip(const u8 *data, size_t data_len,
375 u32 *new_length, u16 domain_nr, u16 bus_nr)
376 {
377 struct nvram_parser nvp;
378 u32 pad;
379 u32 token;
380 __le32 token_le;
381
382 if (brcmf_init_nvram_parser(&nvp, data, data_len) < 0)
383 return NULL;
384
385 while (nvp.pos < data_len) {
386 nvp.state = nv_parser_states[nvp.state](&nvp);
387 if (nvp.state == END)
388 break;
389 }
390 if (nvp.multi_dev_v1) {
391 nvp.boardrev_found = false;
392 brcmf_fw_strip_multi_v1(&nvp, domain_nr, bus_nr);
393 } else if (nvp.multi_dev_v2) {
394 nvp.boardrev_found = false;
395 brcmf_fw_strip_multi_v2(&nvp, domain_nr, bus_nr);
396 }
397
398 if (nvp.nvram_len == 0) {
399 kfree(nvp.nvram);
400 return NULL;
401 }
402
403 brcmf_fw_add_defaults(&nvp);
404
405 pad = nvp.nvram_len;
406 *new_length = roundup(nvp.nvram_len + 1, 4);
407 while (pad != *new_length) {
408 nvp.nvram[pad] = 0;
409 pad++;
410 }
411
412 token = *new_length / 4;
413 token = (~token << 16) | (token & 0x0000FFFF);
414 token_le = cpu_to_le32(token);
415
416 memcpy(&nvp.nvram[*new_length], &token_le, sizeof(token_le));
417 *new_length += sizeof(token_le);
418
419 return nvp.nvram;
420 }
421
brcmf_fw_nvram_free(void * nvram)422 void brcmf_fw_nvram_free(void *nvram)
423 {
424 kfree(nvram);
425 }
426
427 struct brcmf_fw {
428 struct device *dev;
429 struct brcmf_fw_request *req;
430 u32 curpos;
431 void (*done)(struct device *dev, int err, struct brcmf_fw_request *req);
432 };
433
434 static void brcmf_fw_request_done(const struct firmware *fw, void *ctx);
435
436 #ifdef CONFIG_EFI
437 /* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV"
438 * to specify "worldwide" compatible settings, but these 2 ccode-s do not work
439 * properly. "ccode=ALL" causes channels 12 and 13 to not be available,
440 * "ccode=XV" causes all 5GHz channels to not be available. So we replace both
441 * with "ccode=X2" which allows channels 12+13 and 5Ghz channels in
442 * no-Initiate-Radiation mode. This means that we will never send on these
443 * channels without first having received valid wifi traffic on the channel.
444 */
brcmf_fw_fix_efi_nvram_ccode(char * data,unsigned long data_len)445 static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len)
446 {
447 char *ccode;
448
449 ccode = strnstr((char *)data, "ccode=ALL", data_len);
450 if (!ccode)
451 ccode = strnstr((char *)data, "ccode=XV\r", data_len);
452 if (!ccode)
453 return;
454
455 ccode[6] = 'X';
456 ccode[7] = '2';
457 ccode[8] = '\r';
458 }
459
brcmf_fw_nvram_from_efi(size_t * data_len_ret)460 static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret)
461 {
462 const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 };
463 struct efivar_entry *nvram_efivar;
464 unsigned long data_len = 0;
465 u8 *data = NULL;
466 int err;
467
468 nvram_efivar = kzalloc(sizeof(*nvram_efivar), GFP_KERNEL);
469 if (!nvram_efivar)
470 return NULL;
471
472 memcpy(&nvram_efivar->var.VariableName, name, sizeof(name));
473 nvram_efivar->var.VendorGuid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61,
474 0xb5, 0x1f, 0x43, 0x26,
475 0x81, 0x23, 0xd1, 0x13);
476
477 err = efivar_entry_size(nvram_efivar, &data_len);
478 if (err)
479 goto fail;
480
481 data = kmalloc(data_len, GFP_KERNEL);
482 if (!data)
483 goto fail;
484
485 err = efivar_entry_get(nvram_efivar, NULL, &data_len, data);
486 if (err)
487 goto fail;
488
489 brcmf_fw_fix_efi_nvram_ccode(data, data_len);
490 brcmf_info("Using nvram EFI variable\n");
491
492 kfree(nvram_efivar);
493 *data_len_ret = data_len;
494 return data;
495
496 fail:
497 kfree(data);
498 kfree(nvram_efivar);
499 return NULL;
500 }
501 #else
brcmf_fw_nvram_from_efi(size_t * data_len)502 static inline u8 *brcmf_fw_nvram_from_efi(size_t *data_len) { return NULL; }
503 #endif
504
brcmf_fw_free_request(struct brcmf_fw_request * req)505 static void brcmf_fw_free_request(struct brcmf_fw_request *req)
506 {
507 struct brcmf_fw_item *item;
508 int i;
509
510 for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) {
511 if (item->type == BRCMF_FW_TYPE_BINARY)
512 release_firmware(item->binary);
513 else if (item->type == BRCMF_FW_TYPE_NVRAM)
514 brcmf_fw_nvram_free(item->nv_data.data);
515 }
516 kfree(req);
517 }
518
brcmf_fw_request_nvram_done(const struct firmware * fw,void * ctx)519 static int brcmf_fw_request_nvram_done(const struct firmware *fw, void *ctx)
520 {
521 struct brcmf_fw *fwctx = ctx;
522 struct brcmf_fw_item *cur;
523 bool free_bcm47xx_nvram = false;
524 bool kfree_nvram = false;
525 u32 nvram_length = 0;
526 void *nvram = NULL;
527 u8 *data = NULL;
528 size_t data_len;
529
530 brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev));
531
532 cur = &fwctx->req->items[fwctx->curpos];
533
534 if (fw && fw->data) {
535 data = (u8 *)fw->data;
536 data_len = fw->size;
537 } else {
538 if ((data = bcm47xx_nvram_get_contents(&data_len)))
539 free_bcm47xx_nvram = true;
540 else if ((data = brcmf_fw_nvram_from_efi(&data_len)))
541 kfree_nvram = true;
542 else if (!(cur->flags & BRCMF_FW_REQF_OPTIONAL))
543 goto fail;
544 }
545
546 if (data)
547 nvram = brcmf_fw_nvram_strip(data, data_len, &nvram_length,
548 fwctx->req->domain_nr,
549 fwctx->req->bus_nr);
550
551 if (free_bcm47xx_nvram)
552 bcm47xx_nvram_release_contents(data);
553 if (kfree_nvram)
554 kfree(data);
555
556 release_firmware(fw);
557 if (!nvram && !(cur->flags & BRCMF_FW_REQF_OPTIONAL))
558 goto fail;
559
560 brcmf_dbg(TRACE, "nvram %p len %d\n", nvram, nvram_length);
561 cur->nv_data.data = nvram;
562 cur->nv_data.len = nvram_length;
563 return 0;
564
565 fail:
566 return -ENOENT;
567 }
568
brcmf_fw_complete_request(const struct firmware * fw,struct brcmf_fw * fwctx)569 static int brcmf_fw_complete_request(const struct firmware *fw,
570 struct brcmf_fw *fwctx)
571 {
572 struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos];
573 int ret = 0;
574
575 brcmf_dbg(TRACE, "firmware %s %sfound\n", cur->path, fw ? "" : "not ");
576
577 switch (cur->type) {
578 case BRCMF_FW_TYPE_NVRAM:
579 ret = brcmf_fw_request_nvram_done(fw, fwctx);
580 break;
581 case BRCMF_FW_TYPE_BINARY:
582 if (fw)
583 cur->binary = fw;
584 else
585 ret = -ENOENT;
586 break;
587 default:
588 /* something fishy here so bail out early */
589 brcmf_err("unknown fw type: %d\n", cur->type);
590 release_firmware(fw);
591 ret = -EINVAL;
592 }
593
594 return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret;
595 }
596
brcmf_fw_request_firmware(const struct firmware ** fw,struct brcmf_fw * fwctx)597 static int brcmf_fw_request_firmware(const struct firmware **fw,
598 struct brcmf_fw *fwctx)
599 {
600 struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos];
601 int ret;
602
603 /* nvram files are board-specific, first try a board-specific path */
604 if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) {
605 char alt_path[BRCMF_FW_NAME_LEN];
606
607 strlcpy(alt_path, cur->path, BRCMF_FW_NAME_LEN);
608 /* strip .txt at the end */
609 alt_path[strlen(alt_path) - 4] = 0;
610 strlcat(alt_path, ".", BRCMF_FW_NAME_LEN);
611 strlcat(alt_path, fwctx->req->board_type, BRCMF_FW_NAME_LEN);
612 strlcat(alt_path, ".txt", BRCMF_FW_NAME_LEN);
613
614 ret = request_firmware(fw, alt_path, fwctx->dev);
615 if (ret == 0)
616 return ret;
617 }
618
619 return request_firmware(fw, cur->path, fwctx->dev);
620 }
621
brcmf_fw_request_done(const struct firmware * fw,void * ctx)622 static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
623 {
624 struct brcmf_fw *fwctx = ctx;
625 int ret;
626
627 ret = brcmf_fw_complete_request(fw, fwctx);
628
629 while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) {
630 brcmf_fw_request_firmware(&fw, fwctx);
631 ret = brcmf_fw_complete_request(fw, ctx);
632 }
633
634 if (ret) {
635 brcmf_fw_free_request(fwctx->req);
636 fwctx->req = NULL;
637 }
638 fwctx->done(fwctx->dev, ret, fwctx->req);
639 kfree(fwctx);
640 }
641
brcmf_fw_request_is_valid(struct brcmf_fw_request * req)642 static bool brcmf_fw_request_is_valid(struct brcmf_fw_request *req)
643 {
644 struct brcmf_fw_item *item;
645 int i;
646
647 if (!req->n_items)
648 return false;
649
650 for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) {
651 if (!item->path)
652 return false;
653 }
654 return true;
655 }
656
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))657 int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req,
658 void (*fw_cb)(struct device *dev, int err,
659 struct brcmf_fw_request *req))
660 {
661 struct brcmf_fw_item *first = &req->items[0];
662 struct brcmf_fw *fwctx;
663 int ret;
664
665 brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev));
666 if (!fw_cb)
667 return -EINVAL;
668
669 if (!brcmf_fw_request_is_valid(req))
670 return -EINVAL;
671
672 fwctx = kzalloc(sizeof(*fwctx), GFP_KERNEL);
673 if (!fwctx)
674 return -ENOMEM;
675
676 fwctx->dev = dev;
677 fwctx->req = req;
678 fwctx->done = fw_cb;
679
680 ret = request_firmware_nowait(THIS_MODULE, true, first->path,
681 fwctx->dev, GFP_KERNEL, fwctx,
682 brcmf_fw_request_done);
683 if (ret < 0)
684 brcmf_fw_request_done(NULL, fwctx);
685
686 return 0;
687 }
688
689 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)690 brcmf_fw_alloc_request(u32 chip, u32 chiprev,
691 const struct brcmf_firmware_mapping mapping_table[],
692 u32 table_size, struct brcmf_fw_name *fwnames,
693 u32 n_fwnames)
694 {
695 struct brcmf_fw_request *fwreq;
696 char chipname[12];
697 const char *mp_path;
698 size_t mp_path_len;
699 u32 i, j;
700 char end = '\0';
701
702 for (i = 0; i < table_size; i++) {
703 if (mapping_table[i].chipid == chip &&
704 mapping_table[i].revmask & BIT(chiprev))
705 break;
706 }
707
708 brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname));
709
710 if (i == table_size) {
711 brcmf_err("Unknown chip %s\n", chipname);
712 return NULL;
713 }
714
715 fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL);
716 if (!fwreq)
717 return NULL;
718
719 brcmf_info("using %s for chip %s\n",
720 mapping_table[i].fw_base, chipname);
721
722 mp_path = brcmf_mp_global.firmware_path;
723 mp_path_len = strnlen(mp_path, BRCMF_FW_ALTPATH_LEN);
724 if (mp_path_len)
725 end = mp_path[mp_path_len - 1];
726
727 fwreq->n_items = n_fwnames;
728
729 for (j = 0; j < n_fwnames; j++) {
730 fwreq->items[j].path = fwnames[j].path;
731 fwnames[j].path[0] = '\0';
732 /* check if firmware path is provided by module parameter */
733 if (brcmf_mp_global.firmware_path[0] != '\0') {
734 strlcpy(fwnames[j].path, mp_path,
735 BRCMF_FW_NAME_LEN);
736
737 if (end != '/') {
738 strlcat(fwnames[j].path, "/",
739 BRCMF_FW_NAME_LEN);
740 }
741 }
742 strlcat(fwnames[j].path, mapping_table[i].fw_base,
743 BRCMF_FW_NAME_LEN);
744 strlcat(fwnames[j].path, fwnames[j].extension,
745 BRCMF_FW_NAME_LEN);
746 fwreq->items[j].path = fwnames[j].path;
747 }
748
749 return fwreq;
750 }
751