Bluetooth: btrtl: Create separate module for Realtek BT driver

As already done for btintel and btbcm export setup as separate function
in a vendor-specific module to hold all the Realtek specific commands.

Signed-off-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

5 files changed, 462 insertions, 373 deletions

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index ed5c2738bea2..2e777071e1dc 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -9,6 +9,10 @@ config BT_BCM
 	tristate
 	select FW_LOADER
 
+config BT_RTL
+	tristate
+	select FW_LOADER
+
 config BT_HCIBTUSB
 	tristate "HCI USB driver"
 	depends on USB
@@ -32,6 +36,17 @@ config BT_HCIBTUSB_BCM
 
 	  Say Y here to compile support for Broadcom protocol.
 
+config BT_HCIBTUSB_RTL
+	bool "Realtek protocol support"
+	depends on BT_HCIBTUSB
+	select BT_RTL
+	default y
+	help
+	  The Realtek protocol support enables firmware and configuration
+	  download support for Realtek Bluetooth controllers.
+
+	  Say Y here to compile support for Realtek protocol.
+
 config BT_HCIBTSDIO
 	tristate "HCI SDIO driver"
 	depends on MMC
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index dd0d9c40b999..f40e194e7080 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_BT_MRVL)		+= btmrvl.o
 obj-$(CONFIG_BT_MRVL_SDIO)	+= btmrvl_sdio.o
 obj-$(CONFIG_BT_WILINK)		+= btwilink.o
 obj-$(CONFIG_BT_BCM)		+= btbcm.o
+obj-$(CONFIG_BT_RTL)		+= btrtl.o
 
 btmrvl-y			:= btmrvl_main.o
 btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o
diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
new file mode 100644
index 000000000000..84288938f7f2
--- /dev/null
+++ b/drivers/bluetooth/btrtl.c
@@ -0,0 +1,390 @@
+/*
+ *  Bluetooth support for Realtek devices
+ *
+ *  Copyright (C) 2015 Endless Mobile, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <asm/unaligned.h>
+#include <linux/usb.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "btrtl.h"
+
+#define VERSION "0.1"
+
+#define RTL_EPATCH_SIGNATURE	"Realtech"
+#define RTL_ROM_LMP_3499	0x3499
+#define RTL_ROM_LMP_8723A	0x1200
+#define RTL_ROM_LMP_8723B	0x8723
+#define RTL_ROM_LMP_8821A	0x8821
+#define RTL_ROM_LMP_8761A	0x8761
+
+static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version)
+{
+	struct rtl_rom_version_evt *rom_version;
+	struct sk_buff *skb;
+
+	/* Read RTL ROM version command */
+	skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		BT_ERR("%s: Read ROM version failed (%ld)",
+		       hdev->name, PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	if (skb->len != sizeof(*rom_version)) {
+		BT_ERR("%s: RTL version event length mismatch", hdev->name);
+		kfree_skb(skb);
+		return -EIO;
+	}
+
+	rom_version = (struct rtl_rom_version_evt *)skb->data;
+	BT_INFO("%s: rom_version status=%x version=%x",
+		hdev->name, rom_version->status, rom_version->version);
+
+	*version = rom_version->version;
+
+	kfree_skb(skb);
+	return 0;
+}
+
+static int rtl8723b_parse_firmware(struct hci_dev *hdev, u16 lmp_subver,
+				   const struct firmware *fw,
+				   unsigned char **_buf)
+{
+	const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 };
+	struct rtl_epatch_header *epatch_info;
+	unsigned char *buf;
+	int i, ret, len;
+	size_t min_size;
+	u8 opcode, length, data, rom_version = 0;
+	int project_id = -1;
+	const unsigned char *fwptr, *chip_id_base;
+	const unsigned char *patch_length_base, *patch_offset_base;
+	u32 patch_offset = 0;
+	u16 patch_length, num_patches;
+	const u16 project_id_to_lmp_subver[] = {
+		RTL_ROM_LMP_8723A,
+		RTL_ROM_LMP_8723B,
+		RTL_ROM_LMP_8821A,
+		RTL_ROM_LMP_8761A
+	};
+
+	ret = rtl_read_rom_version(hdev, &rom_version);
+	if (ret)
+		return ret;
+
+	min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;
+	if (fw->size < min_size)
+		return -EINVAL;
+
+	fwptr = fw->data + fw->size - sizeof(extension_sig);
+	if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) {
+		BT_ERR("%s: extension section signature mismatch", hdev->name);
+		return -EINVAL;
+	}
+
+	/* Loop from the end of the firmware parsing instructions, until
+	 * we find an instruction that identifies the "project ID" for the
+	 * hardware supported by this firwmare file.
+	 * Once we have that, we double-check that that project_id is suitable
+	 * for the hardware we are working with.
+	 */
+	while (fwptr >= fw->data + (sizeof(struct rtl_epatch_header) + 3)) {
+		opcode = *--fwptr;
+		length = *--fwptr;
+		data = *--fwptr;
+
+		BT_DBG("check op=%x len=%x data=%x", opcode, length, data);
+
+		if (opcode == 0xff) /* EOF */
+			break;
+
+		if (length == 0) {
+			BT_ERR("%s: found instruction with length 0",
+			       hdev->name);
+			return -EINVAL;
+		}
+
+		if (opcode == 0 && length == 1) {
+			project_id = data;
+			break;
+		}
+
+		fwptr -= length;
+	}
+
+	if (project_id < 0) {
+		BT_ERR("%s: failed to find version instruction", hdev->name);
+		return -EINVAL;
+	}
+
+	if (project_id >= ARRAY_SIZE(project_id_to_lmp_subver)) {
+		BT_ERR("%s: unknown project id %d", hdev->name, project_id);
+		return -EINVAL;
+	}
+
+	if (lmp_subver != project_id_to_lmp_subver[project_id]) {
+		BT_ERR("%s: firmware is for %x but this is a %x", hdev->name,
+		       project_id_to_lmp_subver[project_id], lmp_subver);
+		return -EINVAL;
+	}
+
+	epatch_info = (struct rtl_epatch_header *)fw->data;
+	if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) {
+		BT_ERR("%s: bad EPATCH signature", hdev->name);
+		return -EINVAL;
+	}
+
+	num_patches = le16_to_cpu(epatch_info->num_patches);
+	BT_DBG("fw_version=%x, num_patches=%d",
+	       le32_to_cpu(epatch_info->fw_version), num_patches);
+
+	/* After the rtl_epatch_header there is a funky patch metadata section.
+	 * Assuming 2 patches, the layout is:
+	 * ChipID1 ChipID2 PatchLength1 PatchLength2 PatchOffset1 PatchOffset2
+	 *
+	 * Find the right patch for this chip.
+	 */
+	min_size += 8 * num_patches;
+	if (fw->size < min_size)
+		return -EINVAL;
+
+	chip_id_base = fw->data + sizeof(struct rtl_epatch_header);
+	patch_length_base = chip_id_base + (sizeof(u16) * num_patches);
+	patch_offset_base = patch_length_base + (sizeof(u16) * num_patches);
+	for (i = 0; i < num_patches; i++) {
+		u16 chip_id = get_unaligned_le16(chip_id_base +
+						 (i * sizeof(u16)));
+		if (chip_id == rom_version + 1) {
+			patch_length = get_unaligned_le16(patch_length_base +
+							  (i * sizeof(u16)));
+			patch_offset = get_unaligned_le32(patch_offset_base +
+							  (i * sizeof(u32)));
+			break;
+		}
+	}
+
+	if (!patch_offset) {
+		BT_ERR("%s: didn't find patch for chip id %d",
+		       hdev->name, rom_version);
+		return -EINVAL;
+	}
+
+	BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i);
+	min_size = patch_offset + patch_length;
+	if (fw->size < min_size)
+		return -EINVAL;
+
+	/* Copy the firmware into a new buffer and write the version at
+	 * the end.
+	 */
+	len = patch_length;
+	buf = kmemdup(fw->data + patch_offset, patch_length, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	memcpy(buf + patch_length - 4, &epatch_info->fw_version, 4);
+
+	*_buf = buf;
+	return len;
+}
+
+static int rtl_download_firmware(struct hci_dev *hdev,
+				 const unsigned char *data, int fw_len)
+{
+	struct rtl_download_cmd *dl_cmd;
+	int frag_num = fw_len / RTL_FRAG_LEN + 1;
+	int frag_len = RTL_FRAG_LEN;
+	int ret = 0;
+	int i;
+
+	dl_cmd = kmalloc(sizeof(struct rtl_download_cmd), GFP_KERNEL);
+	if (!dl_cmd)
+		return -ENOMEM;
+
+	for (i = 0; i < frag_num; i++) {
+		struct sk_buff *skb;
+
+		BT_DBG("download fw (%d/%d)", i, frag_num);
+
+		dl_cmd->index = i;
+		if (i == (frag_num - 1)) {
+			dl_cmd->index |= 0x80; /* data end */
+			frag_len = fw_len % RTL_FRAG_LEN;
+		}
+		memcpy(dl_cmd->data, data, frag_len);
+
+		/* Send download command */
+		skb = __hci_cmd_sync(hdev, 0xfc20, frag_len + 1, dl_cmd,
+				     HCI_INIT_TIMEOUT);
+		if (IS_ERR(skb)) {
+			BT_ERR("%s: download fw command failed (%ld)",
+			       hdev->name, PTR_ERR(skb));
+			ret = -PTR_ERR(skb);
+			goto out;
+		}
+
+		if (skb->len != sizeof(struct rtl_download_response)) {
+			BT_ERR("%s: download fw event length mismatch",
+			       hdev->name);
+			kfree_skb(skb);
+			ret = -EIO;
+			goto out;
+		}
+
+		kfree_skb(skb);
+		data += RTL_FRAG_LEN;
+	}
+
+out:
+	kfree(dl_cmd);
+	return ret;
+}
+
+static int btrtl_setup_rtl8723a(struct hci_dev *hdev)
+{
+	const struct firmware *fw;
+	int ret;
+
+	BT_INFO("%s: rtl: loading rtl_bt/rtl8723a_fw.bin", hdev->name);
+	ret = request_firmware(&fw, "rtl_bt/rtl8723a_fw.bin", &hdev->dev);
+	if (ret < 0) {
+		BT_ERR("%s: Failed to load rtl_bt/rtl8723a_fw.bin", hdev->name);
+		return ret;
+	}
+
+	if (fw->size < 8) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Check that the firmware doesn't have the epatch signature
+	 * (which is only for RTL8723B and newer).
+	 */
+	if (!memcmp(fw->data, RTL_EPATCH_SIGNATURE, 8)) {
+		BT_ERR("%s: unexpected EPATCH signature!", hdev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = rtl_download_firmware(hdev, fw->data, fw->size);
+
+out:
+	release_firmware(fw);
+	return ret;
+}
+
+static int btrtl_setup_rtl8723b(struct hci_dev *hdev, u16 lmp_subver,
+				const char *fw_name)
+{
+	unsigned char *fw_data = NULL;
+	const struct firmware *fw;
+	int ret;
+
+	BT_INFO("%s: rtl: loading %s", hdev->name, fw_name);
+	ret = request_firmware(&fw, fw_name, &hdev->dev);
+	if (ret < 0) {
+		BT_ERR("%s: Failed to load %s", hdev->name, fw_name);
+		return ret;
+	}
+
+	ret = rtl8723b_parse_firmware(hdev, lmp_subver, fw, &fw_data);
+	if (ret < 0)
+		goto out;
+
+	ret = rtl_download_firmware(hdev, fw_data, ret);
+	kfree(fw_data);
+	if (ret < 0)
+		goto out;
+
+out:
+	release_firmware(fw);
+	return ret;
+}
+
+static struct sk_buff *btrtl_read_local_version(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
+			     HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION failed (%ld)",
+		       hdev->name, PTR_ERR(skb));
+		return skb;
+	}
+
+	if (skb->len != sizeof(struct hci_rp_read_local_version)) {
+		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION event length mismatch",
+		       hdev->name);
+		kfree_skb(skb);
+		return ERR_PTR(-EIO);
+	}
+
+	return skb;
+}
+
+int btrtl_setup_realtek(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	struct hci_rp_read_local_version *resp;
+	u16 lmp_subver;
+
+	skb = btrtl_read_local_version(hdev);
+	if (IS_ERR(skb))
+		return -PTR_ERR(skb);
+
+	resp = (struct hci_rp_read_local_version *)skb->data;
+	BT_INFO("%s: rtl: examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x "
+		"lmp_subver=%04x", hdev->name, resp->hci_ver, resp->hci_rev,
+		resp->lmp_ver, resp->lmp_subver);
+
+	lmp_subver = le16_to_cpu(resp->lmp_subver);
+	kfree_skb(skb);
+
+	/* Match a set of subver values that correspond to stock firmware,
+	 * which is not compatible with standard btusb.
+	 * If matched, upload an alternative firmware that does conform to
+	 * standard btusb. Once that firmware is uploaded, the subver changes
+	 * to a different value.
+	 */
+	switch (lmp_subver) {
+	case RTL_ROM_LMP_8723A:
+	case RTL_ROM_LMP_3499:
+		return btrtl_setup_rtl8723a(hdev);
+	case RTL_ROM_LMP_8723B:
+		return btrtl_setup_rtl8723b(hdev, lmp_subver,
+					    "rtl_bt/rtl8723b_fw.bin");
+	case RTL_ROM_LMP_8821A:
+		return btrtl_setup_rtl8723b(hdev, lmp_subver,
+					    "rtl_bt/rtl8821a_fw.bin");
+	case RTL_ROM_LMP_8761A:
+		return btrtl_setup_rtl8723b(hdev, lmp_subver,
+					    "rtl_bt/rtl8761a_fw.bin");
+	default:
+		BT_INFO("rtl: assuming no firmware upload needed.");
+		return 0;
+	}
+}
+EXPORT_SYMBOL_GPL(btrtl_setup_realtek);
+
+MODULE_AUTHOR("Daniel Drake <drake@endlessm.com>");
+MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h
new file mode 100644
index 000000000000..38ffe4890cd1
--- /dev/null
+++ b/drivers/bluetooth/btrtl.h
@@ -0,0 +1,52 @@
+/*
+ *  Bluetooth support for Realtek devices
+ *
+ *  Copyright (C) 2015 Endless Mobile, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ */
+
+#define RTL_FRAG_LEN 252
+
+struct rtl_download_cmd {
+	__u8 index;
+	__u8 data[RTL_FRAG_LEN];
+} __packed;
+
+struct rtl_download_response {
+	__u8 status;
+	__u8 index;
+} __packed;
+
+struct rtl_rom_version_evt {
+	__u8 status;
+	__u8 version;
+} __packed;
+
+struct rtl_epatch_header {
+	__u8 signature[8];
+	__le32 fw_version;
+	__le16 num_patches;
+} __packed;
+
+#if IS_ENABLED(CONFIG_BT_RTL)
+
+int btrtl_setup_realtek(struct hci_dev *hdev);
+
+#else
+
+static inline int btrtl_setup_realtek(struct hci_dev *hdev)
+{
+	return -EOPNOTSUPP;
+}
+
+#endif
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index d21f3b4176d3..df87016d18ab 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -31,6 +31,7 @@
 
 #include "btintel.h"
 #include "btbcm.h"
+#include "btrtl.h"
 
 #define VERSION "0.8"
 
@@ -1369,378 +1370,6 @@ static int btusb_setup_csr(struct hci_dev *hdev)
 	return ret;
 }
 
-#define RTL_FRAG_LEN 252
-
-struct rtl_download_cmd {
-	__u8 index;
-	__u8 data[RTL_FRAG_LEN];
-} __packed;
-
-struct rtl_download_response {
-	__u8 status;
-	__u8 index;
-} __packed;
-
-struct rtl_rom_version_evt {
-	__u8 status;
-	__u8 version;
-} __packed;
-
-struct rtl_epatch_header {
-	__u8 signature[8];
-	__le32 fw_version;
-	__le16 num_patches;
-} __packed;
-
-#define RTL_EPATCH_SIGNATURE	"Realtech"
-#define RTL_ROM_LMP_3499	0x3499
-#define RTL_ROM_LMP_8723A	0x1200
-#define RTL_ROM_LMP_8723B	0x8723
-#define RTL_ROM_LMP_8821A	0x8821
-#define RTL_ROM_LMP_8761A	0x8761
-
-static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version)
-{
-	struct rtl_rom_version_evt *rom_version;
-	struct sk_buff *skb;
-	int ret;
-
-	/* Read RTL ROM version command */
-	skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
-	if (IS_ERR(skb)) {
-		BT_ERR("%s: Read ROM version failed (%ld)",
-		       hdev->name, PTR_ERR(skb));
-		return PTR_ERR(skb);
-	}
-
-	if (skb->len != sizeof(*rom_version)) {
-		BT_ERR("%s: RTL version event length mismatch", hdev->name);
-		kfree_skb(skb);
-		return -EIO;
-	}
-
-	rom_version = (struct rtl_rom_version_evt *)skb->data;
-	BT_INFO("%s: rom_version status=%x version=%x",
-		hdev->name, rom_version->status, rom_version->version);
-
-	ret = rom_version->status;
-	if (ret == 0)
-		*version = rom_version->version;
-
-	kfree_skb(skb);
-	return ret;
-}
-
-static int rtl8723b_parse_firmware(struct hci_dev *hdev, u16 lmp_subver,
-				   const struct firmware *fw,
-				   unsigned char **_buf)
-{
-	const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 };
-	struct rtl_epatch_header *epatch_info;
-	unsigned char *buf;
-	int i, ret, len;
-	size_t min_size;
-	u8 opcode, length, data, rom_version = 0;
-	int project_id = -1;
-	const unsigned char *fwptr, *chip_id_base;
-	const unsigned char *patch_length_base, *patch_offset_base;
-	u32 patch_offset = 0;
-	u16 patch_length, num_patches;
-	const u16 project_id_to_lmp_subver[] = {
-		RTL_ROM_LMP_8723A,
-		RTL_ROM_LMP_8723B,
-		RTL_ROM_LMP_8821A,
-		RTL_ROM_LMP_8761A
-	};
-
-	ret = rtl_read_rom_version(hdev, &rom_version);
-	if (ret)
-		return -bt_to_errno(ret);
-
-	min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;
-	if (fw->size < min_size)
-		return -EINVAL;
-
-	fwptr = fw->data + fw->size - sizeof(extension_sig);
-	if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) {
-		BT_ERR("%s: extension section signature mismatch", hdev->name);
-		return -EINVAL;
-	}
-
-	/* Loop from the end of the firmware parsing instructions, until
-	 * we find an instruction that identifies the "project ID" for the
-	 * hardware supported by this firwmare file.
-	 * Once we have that, we double-check that that project_id is suitable
-	 * for the hardware we are working with.
-	 */
-	while (fwptr >= fw->data + (sizeof(struct rtl_epatch_header) + 3)) {
-		opcode = *--fwptr;
-		length = *--fwptr;
-		data = *--fwptr;
-
-		BT_DBG("check op=%x len=%x data=%x", opcode, length, data);
-
-		if (opcode == 0xff) /* EOF */
-			break;
-
-		if (length == 0) {
-			BT_ERR("%s: found instruction with length 0",
-			       hdev->name);
-			return -EINVAL;
-		}
-
-		if (opcode == 0 && length == 1) {
-			project_id = data;
-			break;
-		}
-
-		fwptr -= length;
-	}
-
-	if (project_id < 0) {
-		BT_ERR("%s: failed to find version instruction", hdev->name);
-		return -EINVAL;
-	}
-
-	if (project_id >= ARRAY_SIZE(project_id_to_lmp_subver)) {
-		BT_ERR("%s: unknown project id %d", hdev->name, project_id);
-		return -EINVAL;
-	}
-
-	if (lmp_subver != project_id_to_lmp_subver[project_id]) {
-		BT_ERR("%s: firmware is for %x but this is a %x", hdev->name,
-		       project_id_to_lmp_subver[project_id], lmp_subver);
-		return -EINVAL;
-	}
-
-	epatch_info = (struct rtl_epatch_header *)fw->data;
-	if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) {
-		BT_ERR("%s: bad EPATCH signature", hdev->name);
-		return -EINVAL;
-	}
-
-	num_patches = le16_to_cpu(epatch_info->num_patches);
-	BT_DBG("fw_version=%x, num_patches=%d",
-	       le32_to_cpu(epatch_info->fw_version), num_patches);
-
-	/* After the rtl_epatch_header there is a funky patch metadata section.
-	 * Assuming 2 patches, the layout is:
-	 * ChipID1 ChipID2 PatchLength1 PatchLength2 PatchOffset1 PatchOffset2
-	 *
-	 * Find the right patch for this chip.
-	 */
-	min_size += 8 * num_patches;
-	if (fw->size < min_size)
-		return -EINVAL;
-
-	chip_id_base = fw->data + sizeof(struct rtl_epatch_header);
-	patch_length_base = chip_id_base + (sizeof(u16) * num_patches);
-	patch_offset_base = patch_length_base + (sizeof(u16) * num_patches);
-	for (i = 0; i < num_patches; i++) {
-		u16 chip_id = get_unaligned_le16(chip_id_base +
-						 (i * sizeof(u16)));
-		if (chip_id == rom_version + 1) {
-			patch_length = get_unaligned_le16(patch_length_base +
-							  (i * sizeof(u16)));
-			patch_offset = get_unaligned_le32(patch_offset_base +
-							  (i * sizeof(u32)));
-			break;
-		}
-	}
-
-	if (!patch_offset) {
-		BT_ERR("%s: didn't find patch for chip id %d",
-		       hdev->name, rom_version);
-		return -EINVAL;
-	}
-
-	BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i);
-	min_size = patch_offset + patch_length;
-	if (fw->size < min_size)
-		return -EINVAL;
-
-	/* Copy the firmware into a new buffer and write the version at
-	 * the end.
-	 */
-	len = patch_length;
-	buf = kmemdup(fw->data + patch_offset, patch_length, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
-	memcpy(buf + patch_length - 4, &epatch_info->fw_version, 4);
-
-	*_buf = buf;
-	return len;
-}
-
-static int rtl_download_firmware(struct hci_dev *hdev,
-				 const unsigned char *data, int fw_len)
-{
-	struct rtl_download_cmd *dl_cmd;
-	int frag_num = fw_len / RTL_FRAG_LEN + 1;
-	int frag_len = RTL_FRAG_LEN;
-	int ret = 0;
-	int i;
-
-	dl_cmd = kmalloc(sizeof(struct rtl_download_cmd), GFP_KERNEL);
-	if (!dl_cmd)
-		return -ENOMEM;
-
-	for (i = 0; i < frag_num; i++) {
-		struct rtl_download_response *dl_resp;
-		struct sk_buff *skb;
-
-		BT_DBG("download fw (%d/%d)", i, frag_num);
-
-		dl_cmd->index = i;
-		if (i == (frag_num - 1)) {
-			dl_cmd->index |= 0x80; /* data end */
-			frag_len = fw_len % RTL_FRAG_LEN;
-		}
-		memcpy(dl_cmd->data, data, frag_len);
-
-		/* Send download command */
-		skb = __hci_cmd_sync(hdev, 0xfc20, frag_len + 1, dl_cmd,
-				     HCI_INIT_TIMEOUT);
-		if (IS_ERR(skb)) {
-			BT_ERR("%s: download fw command failed (%ld)",
-			       hdev->name, PTR_ERR(skb));
-			ret = -PTR_ERR(skb);
-			goto out;
-		}
-
-		if (skb->len != sizeof(*dl_resp)) {
-			BT_ERR("%s: download fw event length mismatch",
-			       hdev->name);
-			kfree_skb(skb);
-			ret = -EIO;
-			goto out;
-		}
-
-		dl_resp = (struct rtl_download_response *)skb->data;
-		if (dl_resp->status != 0) {
-			kfree_skb(skb);
-			ret = bt_to_errno(dl_resp->status);
-			goto out;
-		}
-
-		kfree_skb(skb);
-		data += RTL_FRAG_LEN;
-	}
-
-out:
-	kfree(dl_cmd);
-	return ret;
-}
-
-static int btusb_setup_rtl8723a(struct hci_dev *hdev)
-{
-	struct btusb_data *data = dev_get_drvdata(&hdev->dev);
-	struct usb_device *udev = interface_to_usbdev(data->intf);
-	const struct firmware *fw;
-	int ret;
-
-	BT_INFO("%s: rtl: loading rtl_bt/rtl8723a_fw.bin", hdev->name);
-	ret = request_firmware(&fw, "rtl_bt/rtl8723a_fw.bin", &udev->dev);
-	if (ret < 0) {
-		BT_ERR("%s: Failed to load rtl_bt/rtl8723a_fw.bin", hdev->name);
-		return ret;
-	}
-
-	if (fw->size < 8) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	/* Check that the firmware doesn't have the epatch signature
-	 * (which is only for RTL8723B and newer).
-	 */
-	if (!memcmp(fw->data, RTL_EPATCH_SIGNATURE, 8)) {
-		BT_ERR("%s: unexpected EPATCH signature!", hdev->name);
-		ret = -EINVAL;
-		goto out;
-	}
-
-	ret = rtl_download_firmware(hdev, fw->data, fw->size);
-
-out:
-	release_firmware(fw);
-	return ret;
-}
-
-static int btusb_setup_rtl8723b(struct hci_dev *hdev, u16 lmp_subver,
-				const char *fw_name)
-{
-	struct btusb_data *data = dev_get_drvdata(&hdev->dev);
-	struct usb_device *udev = interface_to_usbdev(data->intf);
-	unsigned char *fw_data = NULL;
-	const struct firmware *fw;
-	int ret;
-
-	BT_INFO("%s: rtl: loading %s", hdev->name, fw_name);
-	ret = request_firmware(&fw, fw_name, &udev->dev);
-	if (ret < 0) {
-		BT_ERR("%s: Failed to load %s", hdev->name, fw_name);
-		return ret;
-	}
-
-	ret = rtl8723b_parse_firmware(hdev, lmp_subver, fw, &fw_data);
-	if (ret < 0)
-		goto out;
-
-	ret = rtl_download_firmware(hdev, fw_data, ret);
-	kfree(fw_data);
-	if (ret < 0)
-		goto out;
-
-out:
-	release_firmware(fw);
-	return ret;
-}
-
-static int btusb_setup_realtek(struct hci_dev *hdev)
-{
-	struct sk_buff *skb;
-	struct hci_rp_read_local_version *resp;
-	u16 lmp_subver;
-
-	skb = btusb_read_local_version(hdev);
-	if (IS_ERR(skb))
-		return -PTR_ERR(skb);
-
-	resp = (struct hci_rp_read_local_version *)skb->data;
-	BT_INFO("%s: rtl: examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x "
-		"lmp_subver=%04x", hdev->name, resp->hci_ver, resp->hci_rev,
-		resp->lmp_ver, resp->lmp_subver);
-
-	lmp_subver = le16_to_cpu(resp->lmp_subver);
-	kfree_skb(skb);
-
-	/* Match a set of subver values that correspond to stock firmware,
-	 * which is not compatible with standard btusb.
-	 * If matched, upload an alternative firmware that does conform to
-	 * standard btusb. Once that firmware is uploaded, the subver changes
-	 * to a different value.
-	 */
-	switch (lmp_subver) {
-	case RTL_ROM_LMP_8723A:
-	case RTL_ROM_LMP_3499:
-		return btusb_setup_rtl8723a(hdev);
-	case RTL_ROM_LMP_8723B:
-		return btusb_setup_rtl8723b(hdev, lmp_subver,
-					    "rtl_bt/rtl8723b_fw.bin");
-	case RTL_ROM_LMP_8821A:
-		return btusb_setup_rtl8723b(hdev, lmp_subver,
-					    "rtl_bt/rtl8821a_fw.bin");
-	case RTL_ROM_LMP_8761A:
-		return btusb_setup_rtl8723b(hdev, lmp_subver,
-					    "rtl_bt/rtl8761a_fw.bin");
-	default:
-		BT_INFO("rtl: assuming no firmware upload needed.");
-		return 0;
-	}
-}
-
 static const struct firmware *btusb_setup_intel_get_fw(struct hci_dev *hdev,
 						       struct intel_version *ver)
 {
@@ -3172,8 +2801,10 @@ static int btusb_probe(struct usb_interface *intf,
 		hdev->set_bdaddr = btusb_set_bdaddr_ath3012;
 	}
 
+#ifdef CONFIG_BT_HCIBTUSB_RTL
 	if (id->driver_info & BTUSB_REALTEK)
-		hdev->setup = btusb_setup_realtek;
+		hdev->setup = btrtl_setup_realtek;
+#endif
 
 	if (id->driver_info & BTUSB_AMP) {
 		/* AMP controllers do not support SCO packets */