1 files changed, 759 insertions, 0 deletions

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
new file mode 100644
index 000000000..060889bf6
--- /dev/null
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
@@ -0,0 +1,759 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Copyright (c) 2013 Broadcom Corporation
+ */
+
+#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: length 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;
+	/* Add space for properties we may add */
+	size += strlen(BRCMF_FW_DEFAULT_BOARDREV) + 1;
+	/* 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';
+
+	if (chiprev >= BITS_PER_TYPE(u32)) {
+		brcmf_err("Invalid chip revision %u\n", chiprev);
+		return NULL;
+	}
+
+	for (i = 0; i < table_size; i++) {
+		if (mapping_table[i].chipid == chip &&
+		    mapping_table[i].revmask & BIT(chiprev))
+			break;
+	}
+
+	brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname));
+
+	if (i == table_size) {
+		brcmf_err("Unknown chip %s\n", chipname);
+		return NULL;
+	}
+
+	fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL);
+	if (!fwreq)
+		return NULL;
+
+	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;
+		fwnames[j].path[0] = '\0';
+		/* 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;
+}