summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
blob: 14b948917a1a9ef1b957142a3bc6bd4ec1fa3d5d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
/*
 * Copyright (c) 2013 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/efi.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/bcm47xx_nvram.h>

#include "debug.h"
#include "firmware.h"
#include "core.h"
#include "common.h"
#include "chip.h"

#define BRCMF_FW_MAX_NVRAM_SIZE			64000
#define BRCMF_FW_NVRAM_DEVPATH_LEN		19	/* devpath0=pcie/1/4/ */
#define BRCMF_FW_NVRAM_PCIEDEV_LEN		10	/* pcie/1/4/ + \0 */
#define BRCMF_FW_DEFAULT_BOARDREV		"boardrev=0xff"

enum nvram_parser_state {
	IDLE,
	KEY,
	VALUE,
	COMMENT,
	END
};

/**
 * struct nvram_parser - internal info for parser.
 *
 * @state: current parser state.
 * @data: input buffer being parsed.
 * @nvram: output buffer with parse result.
 * @nvram_len: lenght of parse result.
 * @line: current line.
 * @column: current column in line.
 * @pos: byte offset in input buffer.
 * @entry: start position of key,value entry.
 * @multi_dev_v1: detect pcie multi device v1 (compressed).
 * @multi_dev_v2: detect pcie multi device v2.
 * @boardrev_found: nvram contains boardrev information.
 */
struct nvram_parser {
	enum nvram_parser_state state;
	const u8 *data;
	u8 *nvram;
	u32 nvram_len;
	u32 line;
	u32 column;
	u32 pos;
	u32 entry;
	bool multi_dev_v1;
	bool multi_dev_v2;
	bool boardrev_found;
};

/**
 * is_nvram_char() - check if char is a valid one for NVRAM entry
 *
 * It accepts all printable ASCII chars except for '#' which opens a comment.
 * Please note that ' ' (space) while accepted is not a valid key name char.
 */
static bool is_nvram_char(char c)
{
	/* comment marker excluded */
	if (c == '#')
		return false;

	/* key and value may have any other readable character */
	return (c >= 0x20 && c < 0x7f);
}

static bool is_whitespace(char c)
{
	return (c == ' ' || c == '\r' || c == '\n' || c == '\t');
}

static enum nvram_parser_state brcmf_nvram_handle_idle(struct nvram_parser *nvp)
{
	char c;

	c = nvp->data[nvp->pos];
	if (c == '\n')
		return COMMENT;
	if (is_whitespace(c) || c == '\0')
		goto proceed;
	if (c == '#')
		return COMMENT;
	if (is_nvram_char(c)) {
		nvp->entry = nvp->pos;
		return KEY;
	}
	brcmf_dbg(INFO, "warning: ln=%d:col=%d: ignoring invalid character\n",
		  nvp->line, nvp->column);
proceed:
	nvp->column++;
	nvp->pos++;
	return IDLE;
}

static enum nvram_parser_state brcmf_nvram_handle_key(struct nvram_parser *nvp)
{
	enum nvram_parser_state st = nvp->state;
	char c;

	c = nvp->data[nvp->pos];
	if (c == '=') {
		/* ignore RAW1 by treating as comment */
		if (strncmp(&nvp->data[nvp->entry], "RAW1", 4) == 0)
			st = COMMENT;
		else
			st = VALUE;
		if (strncmp(&nvp->data[nvp->entry], "devpath", 7) == 0)
			nvp->multi_dev_v1 = true;
		if (strncmp(&nvp->data[nvp->entry], "pcie/", 5) == 0)
			nvp->multi_dev_v2 = true;
		if (strncmp(&nvp->data[nvp->entry], "boardrev", 8) == 0)
			nvp->boardrev_found = true;
	} else if (!is_nvram_char(c) || c == ' ') {
		brcmf_dbg(INFO, "warning: ln=%d:col=%d: '=' expected, skip invalid key entry\n",
			  nvp->line, nvp->column);
		return COMMENT;
	}

	nvp->column++;
	nvp->pos++;
	return st;
}

static enum nvram_parser_state
brcmf_nvram_handle_value(struct nvram_parser *nvp)
{
	char c;
	char *skv;
	char *ekv;
	u32 cplen;

	c = nvp->data[nvp->pos];
	if (!is_nvram_char(c)) {
		/* key,value pair complete */
		ekv = (u8 *)&nvp->data[nvp->pos];
		skv = (u8 *)&nvp->data[nvp->entry];
		cplen = ekv - skv;
		if (nvp->nvram_len + cplen + 1 >= BRCMF_FW_MAX_NVRAM_SIZE)
			return END;
		/* copy to output buffer */
		memcpy(&nvp->nvram[nvp->nvram_len], skv, cplen);
		nvp->nvram_len += cplen;
		nvp->nvram[nvp->nvram_len] = '\0';
		nvp->nvram_len++;
		return IDLE;
	}
	nvp->pos++;
	nvp->column++;
	return VALUE;
}

static enum nvram_parser_state
brcmf_nvram_handle_comment(struct nvram_parser *nvp)
{
	char *eoc, *sol;

	sol = (char *)&nvp->data[nvp->pos];
	eoc = strchr(sol, '\n');
	if (!eoc) {
		eoc = strchr(sol, '\0');
		if (!eoc)
			return END;
	}

	/* eat all moving to next line */
	nvp->line++;
	nvp->column = 1;
	nvp->pos += (eoc - sol) + 1;
	return IDLE;
}

static enum nvram_parser_state brcmf_nvram_handle_end(struct nvram_parser *nvp)
{
	/* final state */
	return END;
}

static enum nvram_parser_state
(*nv_parser_states[])(struct nvram_parser *nvp) = {
	brcmf_nvram_handle_idle,
	brcmf_nvram_handle_key,
	brcmf_nvram_handle_value,
	brcmf_nvram_handle_comment,
	brcmf_nvram_handle_end
};

static int brcmf_init_nvram_parser(struct nvram_parser *nvp,
				   const u8 *data, size_t data_len)
{
	size_t size;

	memset(nvp, 0, sizeof(*nvp));
	nvp->data = data;
	/* Limit size to MAX_NVRAM_SIZE, some files contain lot of comment */
	if (data_len > BRCMF_FW_MAX_NVRAM_SIZE)
		size = BRCMF_FW_MAX_NVRAM_SIZE;
	else
		size = data_len;
	/* Alloc for extra 0 byte + roundup by 4 + length field */
	size += 1 + 3 + sizeof(u32);
	nvp->nvram = kzalloc(size, GFP_KERNEL);
	if (!nvp->nvram)
		return -ENOMEM;

	nvp->line = 1;
	nvp->column = 1;
	return 0;
}

/* brcmf_fw_strip_multi_v1 :Some nvram files contain settings for multiple
 * devices. Strip it down for one device, use domain_nr/bus_nr to determine
 * which data is to be returned. v1 is the version where nvram is stored
 * compressed and "devpath" maps to index for valid entries.
 */
static void brcmf_fw_strip_multi_v1(struct nvram_parser *nvp, u16 domain_nr,
				    u16 bus_nr)
{
	/* Device path with a leading '=' key-value separator */
	char pci_path[] = "=pci/?/?";
	size_t pci_len;
	char pcie_path[] = "=pcie/?/?";
	size_t pcie_len;

	u32 i, j;
	bool found;
	u8 *nvram;
	u8 id;

	nvram = kzalloc(nvp->nvram_len + 1 + 3 + sizeof(u32), GFP_KERNEL);
	if (!nvram)
		goto fail;

	/* min length: devpath0=pcie/1/4/ + 0:x=y */
	if (nvp->nvram_len < BRCMF_FW_NVRAM_DEVPATH_LEN + 6)
		goto fail;

	/* First search for the devpathX and see if it is the configuration
	 * for domain_nr/bus_nr. Search complete nvp
	 */
	snprintf(pci_path, sizeof(pci_path), "=pci/%d/%d", domain_nr,
		 bus_nr);
	pci_len = strlen(pci_path);
	snprintf(pcie_path, sizeof(pcie_path), "=pcie/%d/%d", domain_nr,
		 bus_nr);
	pcie_len = strlen(pcie_path);
	found = false;
	i = 0;
	while (i < nvp->nvram_len - BRCMF_FW_NVRAM_DEVPATH_LEN) {
		/* Format: devpathX=pcie/Y/Z/
		 * Y = domain_nr, Z = bus_nr, X = virtual ID
		 */
		if (strncmp(&nvp->nvram[i], "devpath", 7) == 0 &&
		    (!strncmp(&nvp->nvram[i + 8], pci_path, pci_len) ||
		     !strncmp(&nvp->nvram[i + 8], pcie_path, pcie_len))) {
			id = nvp->nvram[i + 7] - '0';
			found = true;
			break;
		}
		while (nvp->nvram[i] != 0)
			i++;
		i++;
	}
	if (!found)
		goto fail;

	/* Now copy all valid entries, release old nvram and assign new one */
	i = 0;
	j = 0;
	while (i < nvp->nvram_len) {
		if ((nvp->nvram[i] - '0' == id) && (nvp->nvram[i + 1] == ':')) {
			i += 2;
			if (strncmp(&nvp->nvram[i], "boardrev", 8) == 0)
				nvp->boardrev_found = true;
			while (nvp->nvram[i] != 0) {
				nvram[j] = nvp->nvram[i];
				i++;
				j++;
			}
			nvram[j] = 0;
			j++;
		}
		while (nvp->nvram[i] != 0)
			i++;
		i++;
	}
	kfree(nvp->nvram);
	nvp->nvram = nvram;
	nvp->nvram_len = j;
	return;

fail:
	kfree(nvram);
	nvp->nvram_len = 0;
}

/* brcmf_fw_strip_multi_v2 :Some nvram files contain settings for multiple
 * devices. Strip it down for one device, use domain_nr/bus_nr to determine
 * which data is to be returned. v2 is the version where nvram is stored
 * uncompressed, all relevant valid entries are identified by
 * pcie/domain_nr/bus_nr:
 */
static void brcmf_fw_strip_multi_v2(struct nvram_parser *nvp, u16 domain_nr,
				    u16 bus_nr)
{
	char prefix[BRCMF_FW_NVRAM_PCIEDEV_LEN];
	size_t len;
	u32 i, j;
	u8 *nvram;

	nvram = kzalloc(nvp->nvram_len + 1 + 3 + sizeof(u32), GFP_KERNEL);
	if (!nvram)
		goto fail;

	/* Copy all valid entries, release old nvram and assign new one.
	 * Valid entries are of type pcie/X/Y/ where X = domain_nr and
	 * Y = bus_nr.
	 */
	snprintf(prefix, sizeof(prefix), "pcie/%d/%d/", domain_nr, bus_nr);
	len = strlen(prefix);
	i = 0;
	j = 0;
	while (i < nvp->nvram_len - len) {
		if (strncmp(&nvp->nvram[i], prefix, len) == 0) {
			i += len;
			if (strncmp(&nvp->nvram[i], "boardrev", 8) == 0)
				nvp->boardrev_found = true;
			while (nvp->nvram[i] != 0) {
				nvram[j] = nvp->nvram[i];
				i++;
				j++;
			}
			nvram[j] = 0;
			j++;
		}
		while (nvp->nvram[i] != 0)
			i++;
		i++;
	}
	kfree(nvp->nvram);
	nvp->nvram = nvram;
	nvp->nvram_len = j;
	return;
fail:
	kfree(nvram);
	nvp->nvram_len = 0;
}

static void brcmf_fw_add_defaults(struct nvram_parser *nvp)
{
	if (nvp->boardrev_found)
		return;

	memcpy(&nvp->nvram[nvp->nvram_len], &BRCMF_FW_DEFAULT_BOARDREV,
	       strlen(BRCMF_FW_DEFAULT_BOARDREV));
	nvp->nvram_len += strlen(BRCMF_FW_DEFAULT_BOARDREV);
	nvp->nvram[nvp->nvram_len] = '\0';
	nvp->nvram_len++;
}

/* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a fil
 * and ending in a NUL. Removes carriage returns, empty lines, comment lines,
 * and converts newlines to NULs. Shortens buffer as needed and pads with NULs.
 * End of buffer is completed with token identifying length of buffer.
 */
static void *brcmf_fw_nvram_strip(const u8 *data, size_t data_len,
				  u32 *new_length, u16 domain_nr, u16 bus_nr)
{
	struct nvram_parser nvp;
	u32 pad;
	u32 token;
	__le32 token_le;

	if (brcmf_init_nvram_parser(&nvp, data, data_len) < 0)
		return NULL;

	while (nvp.pos < data_len) {
		nvp.state = nv_parser_states[nvp.state](&nvp);
		if (nvp.state == END)
			break;
	}
	if (nvp.multi_dev_v1) {
		nvp.boardrev_found = false;
		brcmf_fw_strip_multi_v1(&nvp, domain_nr, bus_nr);
	} else if (nvp.multi_dev_v2) {
		nvp.boardrev_found = false;
		brcmf_fw_strip_multi_v2(&nvp, domain_nr, bus_nr);
	}

	if (nvp.nvram_len == 0) {
		kfree(nvp.nvram);
		return NULL;
	}

	brcmf_fw_add_defaults(&nvp);

	pad = nvp.nvram_len;
	*new_length = roundup(nvp.nvram_len + 1, 4);
	while (pad != *new_length) {
		nvp.nvram[pad] = 0;
		pad++;
	}

	token = *new_length / 4;
	token = (~token << 16) | (token & 0x0000FFFF);
	token_le = cpu_to_le32(token);

	memcpy(&nvp.nvram[*new_length], &token_le, sizeof(token_le));
	*new_length += sizeof(token_le);

	return nvp.nvram;
}

void brcmf_fw_nvram_free(void *nvram)
{
	kfree(nvram);
}

struct brcmf_fw {
	struct device *dev;
	struct brcmf_fw_request *req;
	u32 curpos;
	void (*done)(struct device *dev, int err, struct brcmf_fw_request *req);
};

static void brcmf_fw_request_done(const struct firmware *fw, void *ctx);

#ifdef CONFIG_EFI
/* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV"
 * to specify "worldwide" compatible settings, but these 2 ccode-s do not work
 * properly. "ccode=ALL" causes channels 12 and 13 to not be available,
 * "ccode=XV" causes all 5GHz channels to not be available. So we replace both
 * with "ccode=X2" which allows channels 12+13 and 5Ghz channels in
 * no-Initiate-Radiation mode. This means that we will never send on these
 * channels without first having received valid wifi traffic on the channel.
 */
static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len)
{
	char *ccode;

	ccode = strnstr((char *)data, "ccode=ALL", data_len);
	if (!ccode)
		ccode = strnstr((char *)data, "ccode=XV\r", data_len);
	if (!ccode)
		return;

	ccode[6] = 'X';
	ccode[7] = '2';
	ccode[8] = '\r';
}

static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret)
{
	const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 };
	struct efivar_entry *nvram_efivar;
	unsigned long data_len = 0;
	u8 *data = NULL;
	int err;

	nvram_efivar = kzalloc(sizeof(*nvram_efivar), GFP_KERNEL);
	if (!nvram_efivar)
		return NULL;

	memcpy(&nvram_efivar->var.VariableName, name, sizeof(name));
	nvram_efivar->var.VendorGuid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61,
						0xb5, 0x1f, 0x43, 0x26,
						0x81, 0x23, 0xd1, 0x13);

	err = efivar_entry_size(nvram_efivar, &data_len);
	if (err)
		goto fail;

	data = kmalloc(data_len, GFP_KERNEL);
	if (!data)
		goto fail;

	err = efivar_entry_get(nvram_efivar, NULL, &data_len, data);
	if (err)
		goto fail;

	brcmf_fw_fix_efi_nvram_ccode(data, data_len);
	brcmf_info("Using nvram EFI variable\n");

	kfree(nvram_efivar);
	*data_len_ret = data_len;
	return data;

fail:
	kfree(data);
	kfree(nvram_efivar);
	return NULL;
}
#else
static inline u8 *brcmf_fw_nvram_from_efi(size_t *data_len) { return NULL; }
#endif

static void brcmf_fw_free_request(struct brcmf_fw_request *req)
{
	struct brcmf_fw_item *item;
	int i;

	for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) {
		if (item->type == BRCMF_FW_TYPE_BINARY)
			release_firmware(item->binary);
		else if (item->type == BRCMF_FW_TYPE_NVRAM)
			brcmf_fw_nvram_free(item->nv_data.data);
	}
	kfree(req);
}

static int brcmf_fw_request_nvram_done(const struct firmware *fw, void *ctx)
{
	struct brcmf_fw *fwctx = ctx;
	struct brcmf_fw_item *cur;
	bool free_bcm47xx_nvram = false;
	bool kfree_nvram = false;
	u32 nvram_length = 0;
	void *nvram = NULL;
	u8 *data = NULL;
	size_t data_len;

	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev));

	cur = &fwctx->req->items[fwctx->curpos];

	if (fw && fw->data) {
		data = (u8 *)fw->data;
		data_len = fw->size;
	} else {
		if ((data = bcm47xx_nvram_get_contents(&data_len)))
			free_bcm47xx_nvram = true;
		else if ((data = brcmf_fw_nvram_from_efi(&data_len)))
			kfree_nvram = true;
		else if (!(cur->flags & BRCMF_FW_REQF_OPTIONAL))
			goto fail;
	}

	if (data)
		nvram = brcmf_fw_nvram_strip(data, data_len, &nvram_length,
					     fwctx->req->domain_nr,
					     fwctx->req->bus_nr);

	if (free_bcm47xx_nvram)
		bcm47xx_nvram_release_contents(data);
	if (kfree_nvram)
		kfree(data);

	release_firmware(fw);
	if (!nvram && !(cur->flags & BRCMF_FW_REQF_OPTIONAL))
		goto fail;

	brcmf_dbg(TRACE, "nvram %p len %d\n", nvram, nvram_length);
	cur->nv_data.data = nvram;
	cur->nv_data.len = nvram_length;
	return 0;

fail:
	return -ENOENT;
}

static int brcmf_fw_complete_request(const struct firmware *fw,
				     struct brcmf_fw *fwctx)
{
	struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos];
	int ret = 0;

	brcmf_dbg(TRACE, "firmware %s %sfound\n", cur->path, fw ? "" : "not ");

	switch (cur->type) {
	case BRCMF_FW_TYPE_NVRAM:
		ret = brcmf_fw_request_nvram_done(fw, fwctx);
		break;
	case BRCMF_FW_TYPE_BINARY:
		if (fw)
			cur->binary = fw;
		else
			ret = -ENOENT;
		break;
	default:
		/* something fishy here so bail out early */
		brcmf_err("unknown fw type: %d\n", cur->type);
		release_firmware(fw);
		ret = -EINVAL;
	}

	return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret;
}

static int brcmf_fw_request_firmware(const struct firmware **fw,
				     struct brcmf_fw *fwctx)
{
	struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos];
	int ret;

	/* nvram files are board-specific, first try a board-specific path */
	if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) {
		char alt_path[BRCMF_FW_NAME_LEN];

		strlcpy(alt_path, cur->path, BRCMF_FW_NAME_LEN);
		/* strip .txt at the end */
		alt_path[strlen(alt_path) - 4] = 0;
		strlcat(alt_path, ".", BRCMF_FW_NAME_LEN);
		strlcat(alt_path, fwctx->req->board_type, BRCMF_FW_NAME_LEN);
		strlcat(alt_path, ".txt", BRCMF_FW_NAME_LEN);

		ret = request_firmware(fw, alt_path, fwctx->dev);
		if (ret == 0)
			return ret;
	}

	return request_firmware(fw, cur->path, fwctx->dev);
}

static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
{
	struct brcmf_fw *fwctx = ctx;
	int ret;

	ret = brcmf_fw_complete_request(fw, fwctx);

	while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) {
		brcmf_fw_request_firmware(&fw, fwctx);
		ret = brcmf_fw_complete_request(fw, ctx);
	}

	if (ret) {
		brcmf_fw_free_request(fwctx->req);
		fwctx->req = NULL;
	}
	fwctx->done(fwctx->dev, ret, fwctx->req);
	kfree(fwctx);
}

static bool brcmf_fw_request_is_valid(struct brcmf_fw_request *req)
{
	struct brcmf_fw_item *item;
	int i;

	if (!req->n_items)
		return false;

	for (i = 0, item = &req->items[0]; i < req->n_items; i++, item++) {
		if (!item->path)
			return false;
	}
	return true;
}

int 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))
{
	struct brcmf_fw_item *first = &req->items[0];
	struct brcmf_fw *fwctx;
	int ret;

	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev));
	if (!fw_cb)
		return -EINVAL;

	if (!brcmf_fw_request_is_valid(req))
		return -EINVAL;

	fwctx = kzalloc(sizeof(*fwctx), GFP_KERNEL);
	if (!fwctx)
		return -ENOMEM;

	fwctx->dev = dev;
	fwctx->req = req;
	fwctx->done = fw_cb;

	ret = request_firmware_nowait(THIS_MODULE, true, first->path,
				      fwctx->dev, GFP_KERNEL, fwctx,
				      brcmf_fw_request_done);
	if (ret < 0)
		brcmf_fw_request_done(NULL, fwctx);

	return 0;
}

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)
{
	struct brcmf_fw_request *fwreq;
	char chipname[12];
	const char *mp_path;
	size_t mp_path_len;
	u32 i, j;
	char end = '\0';
	size_t reqsz;

	for (i = 0; i < table_size; i++) {
		if (mapping_table[i].chipid == chip &&
		    mapping_table[i].revmask & BIT(chiprev))
			break;
	}

	if (i == table_size) {
		brcmf_err("Unknown chipid %d [%d]\n", chip, chiprev);
		return NULL;
	}

	reqsz = sizeof(*fwreq) + n_fwnames * sizeof(struct brcmf_fw_item);
	fwreq = kzalloc(reqsz, GFP_KERNEL);
	if (!fwreq)
		return NULL;

	brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname));

	brcmf_info("using %s for chip %s\n",
		   mapping_table[i].fw_base, chipname);

	mp_path = brcmf_mp_global.firmware_path;
	mp_path_len = strnlen(mp_path, BRCMF_FW_ALTPATH_LEN);
	if (mp_path_len)
		end = mp_path[mp_path_len - 1];

	fwreq->n_items = n_fwnames;

	for (j = 0; j < n_fwnames; j++) {
		fwreq->items[j].path = fwnames[j].path;
		/* check if firmware path is provided by module parameter */
		if (brcmf_mp_global.firmware_path[0] != '\0') {
			strlcpy(fwnames[j].path, mp_path,
				BRCMF_FW_NAME_LEN);

			if (end != '/') {
				strlcat(fwnames[j].path, "/",
					BRCMF_FW_NAME_LEN);
			}
		}
		strlcat(fwnames[j].path, mapping_table[i].fw_base,
			BRCMF_FW_NAME_LEN);
		strlcat(fwnames[j].path, fwnames[j].extension,
			BRCMF_FW_NAME_LEN);
		fwreq->items[j].path = fwnames[j].path;
	}

	return fwreq;
}