Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 837 insertions, 0 deletions

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
new file mode 100644
index 000000000..3a9afc905
--- /dev/null
+++ b/drivers/bluetooth/btrtl.c
@@ -0,0 +1,837 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Bluetooth support for Realtek devices
+ *
+ *  Copyright (C) 2015 Endless Mobile, Inc.
+ */
+
+#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_8723D	0x8873
+#define RTL_ROM_LMP_8821A	0x8821
+#define RTL_ROM_LMP_8761A	0x8761
+#define RTL_ROM_LMP_8822B	0x8822
+#define RTL_CONFIG_MAGIC	0x8723ab55
+
+#define IC_MATCH_FL_LMPSUBV	(1 << 0)
+#define IC_MATCH_FL_HCIREV	(1 << 1)
+#define IC_MATCH_FL_HCIVER	(1 << 2)
+#define IC_MATCH_FL_HCIBUS	(1 << 3)
+#define IC_INFO(lmps, hcir) \
+	.match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV, \
+	.lmp_subver = (lmps), \
+	.hci_rev = (hcir)
+
+struct id_table {
+	__u16 match_flags;
+	__u16 lmp_subver;
+	__u16 hci_rev;
+	__u8 hci_ver;
+	__u8 hci_bus;
+	bool config_needed;
+	bool has_rom_version;
+	char *fw_name;
+	char *cfg_name;
+};
+
+struct btrtl_device_info {
+	const struct id_table *ic_info;
+	u8 rom_version;
+	u8 *fw_data;
+	int fw_len;
+	u8 *cfg_data;
+	int cfg_len;
+};
+
+static const struct id_table ic_id_table[] = {
+	{ IC_MATCH_FL_LMPSUBV, RTL_ROM_LMP_8723A, 0x0,
+	  .config_needed = false,
+	  .has_rom_version = false,
+	  .fw_name = "rtl_bt/rtl8723a_fw.bin",
+	  .cfg_name = NULL },
+
+	{ IC_MATCH_FL_LMPSUBV, RTL_ROM_LMP_3499, 0x0,
+	  .config_needed = false,
+	  .has_rom_version = false,
+	  .fw_name = "rtl_bt/rtl8723a_fw.bin",
+	  .cfg_name = NULL },
+
+	/* 8723BS */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV |
+			 IC_MATCH_FL_HCIVER | IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8723B,
+	  .hci_rev = 0xb,
+	  .hci_ver = 6,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723bs_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723bs_config" },
+
+	/* 8723B */
+	{ IC_INFO(RTL_ROM_LMP_8723B, 0xb),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723b_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723b_config" },
+
+	/* 8723D */
+	{ IC_INFO(RTL_ROM_LMP_8723B, 0xd),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723d_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723d_config" },
+
+	/* 8723DS */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV |
+			 IC_MATCH_FL_HCIVER | IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8723B,
+	  .hci_rev = 0xd,
+	  .hci_ver = 8,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723ds_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723ds_config" },
+
+	/* 8723DU */
+	{ IC_INFO(RTL_ROM_LMP_8723D, 0x826C),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723d_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723d_config" },
+
+	/* 8821A */
+	{ IC_INFO(RTL_ROM_LMP_8821A, 0xa),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8821a_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8821a_config" },
+
+	/* 8821C */
+	{ IC_INFO(RTL_ROM_LMP_8821A, 0xc),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8821c_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8821c_config" },
+
+	/* 8761A */
+	{ IC_INFO(RTL_ROM_LMP_8761A, 0xa),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8761a_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8761a_config" },
+
+	/* 8761B */
+	{ IC_INFO(RTL_ROM_LMP_8761A, 0xb),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8761b_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8761b_config" },
+
+	/* 8822C with UART interface */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8822B,
+	  .hci_rev = 0x000c,
+	  .hci_ver = 0x0a,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8822cs_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8822cs_config" },
+
+	/* 8822C with USB interface */
+	{ IC_INFO(RTL_ROM_LMP_8822B, 0xc),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8822cu_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8822cu_config" },
+
+	/* 8822B */
+	{ IC_INFO(RTL_ROM_LMP_8822B, 0xb),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8822b_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8822b_config" },
+	};
+
+static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
+					     u8 hci_ver, u8 hci_bus)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ic_id_table); i++) {
+		if ((ic_id_table[i].match_flags & IC_MATCH_FL_LMPSUBV) &&
+		    (ic_id_table[i].lmp_subver != lmp_subver))
+			continue;
+		if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIREV) &&
+		    (ic_id_table[i].hci_rev != hci_rev))
+			continue;
+		if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIVER) &&
+		    (ic_id_table[i].hci_ver != hci_ver))
+			continue;
+		if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIBUS) &&
+		    (ic_id_table[i].hci_bus != hci_bus))
+			continue;
+
+		break;
+	}
+	if (i >= ARRAY_SIZE(ic_id_table))
+		return NULL;
+
+	return &ic_id_table[i];
+}
+
+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)) {
+		rtl_dev_err(hdev, "HCI_OP_READ_LOCAL_VERSION failed (%ld)",
+			    PTR_ERR(skb));
+		return skb;
+	}
+
+	if (skb->len != sizeof(struct hci_rp_read_local_version)) {
+		rtl_dev_err(hdev, "HCI_OP_READ_LOCAL_VERSION event length mismatch");
+		kfree_skb(skb);
+		return ERR_PTR(-EIO);
+	}
+
+	return skb;
+}
+
+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)) {
+		rtl_dev_err(hdev, "Read ROM version failed (%ld)",
+			    PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	if (skb->len != sizeof(*rom_version)) {
+		rtl_dev_err(hdev, "version event length mismatch");
+		kfree_skb(skb);
+		return -EIO;
+	}
+
+	rom_version = (struct rtl_rom_version_evt *)skb->data;
+	rtl_dev_info(hdev, "rom_version status=%x version=%x",
+		     rom_version->status, rom_version->version);
+
+	*version = rom_version->version;
+
+	kfree_skb(skb);
+	return 0;
+}
+
+static int rtlbt_parse_firmware(struct hci_dev *hdev,
+				struct btrtl_device_info *btrtl_dev,
+				unsigned char **_buf)
+{
+	static const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 };
+	struct rtl_epatch_header *epatch_info;
+	unsigned char *buf;
+	int i, len;
+	size_t min_size;
+	u8 opcode, length, data;
+	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;
+	static const struct {
+		__u16 lmp_subver;
+		__u8 id;
+	} project_id_to_lmp_subver[] = {
+		{ RTL_ROM_LMP_8723A, 0 },
+		{ RTL_ROM_LMP_8723B, 1 },
+		{ RTL_ROM_LMP_8821A, 2 },
+		{ RTL_ROM_LMP_8761A, 3 },
+		{ RTL_ROM_LMP_8822B, 8 },
+		{ RTL_ROM_LMP_8723B, 9 },	/* 8723D */
+		{ RTL_ROM_LMP_8821A, 10 },	/* 8821C */
+		{ RTL_ROM_LMP_8822B, 13 },	/* 8822C */
+		{ RTL_ROM_LMP_8761A, 14 },	/* 8761B */
+	};
+
+	min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;
+	if (btrtl_dev->fw_len < min_size)
+		return -EINVAL;
+
+	fwptr = btrtl_dev->fw_data + btrtl_dev->fw_len - sizeof(extension_sig);
+	if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) {
+		rtl_dev_err(hdev, "extension section signature mismatch");
+		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 >= btrtl_dev->fw_data + (sizeof(*epatch_info) + 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) {
+			rtl_dev_err(hdev, "found instruction with length 0");
+			return -EINVAL;
+		}
+
+		if (opcode == 0 && length == 1) {
+			project_id = data;
+			break;
+		}
+
+		fwptr -= length;
+	}
+
+	if (project_id < 0) {
+		rtl_dev_err(hdev, "failed to find version instruction");
+		return -EINVAL;
+	}
+
+	/* Find project_id in table */
+	for (i = 0; i < ARRAY_SIZE(project_id_to_lmp_subver); i++) {
+		if (project_id == project_id_to_lmp_subver[i].id)
+			break;
+	}
+
+	if (i >= ARRAY_SIZE(project_id_to_lmp_subver)) {
+		rtl_dev_err(hdev, "unknown project id %d", project_id);
+		return -EINVAL;
+	}
+
+	if (btrtl_dev->ic_info->lmp_subver !=
+				project_id_to_lmp_subver[i].lmp_subver) {
+		rtl_dev_err(hdev, "firmware is for %x but this is a %x",
+			    project_id_to_lmp_subver[i].lmp_subver,
+			    btrtl_dev->ic_info->lmp_subver);
+		return -EINVAL;
+	}
+
+	epatch_info = (struct rtl_epatch_header *)btrtl_dev->fw_data;
+	if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) {
+		rtl_dev_err(hdev, "bad EPATCH signature");
+		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 (btrtl_dev->fw_len < min_size)
+		return -EINVAL;
+
+	chip_id_base = btrtl_dev->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 == btrtl_dev->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) {
+		rtl_dev_err(hdev, "didn't find patch for chip id %d",
+			    btrtl_dev->rom_version);
+		return -EINVAL;
+	}
+
+	BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i);
+	min_size = patch_offset + patch_length;
+	if (btrtl_dev->fw_len < min_size)
+		return -EINVAL;
+
+	/* Copy the firmware into a new buffer and write the version at
+	 * the end.
+	 */
+	len = patch_length;
+	buf = kvmalloc(patch_length, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	memcpy(buf, btrtl_dev->fw_data + patch_offset, patch_length - 4);
+	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;
+	struct sk_buff *skb;
+	struct hci_rp_read_local_version *rp;
+
+	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);
+
+		if (i > 0x7f)
+			dl_cmd->index = (i & 0x7f) + 1;
+		else
+			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)) {
+			rtl_dev_err(hdev, "download fw command failed (%ld)",
+				    PTR_ERR(skb));
+			ret = PTR_ERR(skb);
+			goto out;
+		}
+
+		if (skb->len != sizeof(struct rtl_download_response)) {
+			rtl_dev_err(hdev, "download fw event length mismatch");
+			kfree_skb(skb);
+			ret = -EIO;
+			goto out;
+		}
+
+		kfree_skb(skb);
+		data += RTL_FRAG_LEN;
+	}
+
+	skb = btrtl_read_local_version(hdev);
+	if (IS_ERR(skb)) {
+		ret = PTR_ERR(skb);
+		rtl_dev_err(hdev, "read local version failed");
+		goto out;
+	}
+
+	rp = (struct hci_rp_read_local_version *)skb->data;
+	rtl_dev_info(hdev, "fw version 0x%04x%04x",
+		     __le16_to_cpu(rp->hci_rev), __le16_to_cpu(rp->lmp_subver));
+	kfree_skb(skb);
+
+out:
+	kfree(dl_cmd);
+	return ret;
+}
+
+static int rtl_load_file(struct hci_dev *hdev, const char *name, u8 **buff)
+{
+	const struct firmware *fw;
+	int ret;
+
+	rtl_dev_info(hdev, "loading %s", name);
+	ret = request_firmware(&fw, name, &hdev->dev);
+	if (ret < 0)
+		return ret;
+	ret = fw->size;
+	*buff = kvmalloc(fw->size, GFP_KERNEL);
+	if (*buff)
+		memcpy(*buff, fw->data, ret);
+	else
+		ret = -ENOMEM;
+
+	release_firmware(fw);
+
+	return ret;
+}
+
+static int btrtl_setup_rtl8723a(struct hci_dev *hdev,
+				struct btrtl_device_info *btrtl_dev)
+{
+	if (btrtl_dev->fw_len < 8)
+		return -EINVAL;
+
+	/* Check that the firmware doesn't have the epatch signature
+	 * (which is only for RTL8723B and newer).
+	 */
+	if (!memcmp(btrtl_dev->fw_data, RTL_EPATCH_SIGNATURE, 8)) {
+		rtl_dev_err(hdev, "unexpected EPATCH signature!");
+		return -EINVAL;
+	}
+
+	return rtl_download_firmware(hdev, btrtl_dev->fw_data,
+				     btrtl_dev->fw_len);
+}
+
+static int btrtl_setup_rtl8723b(struct hci_dev *hdev,
+				struct btrtl_device_info *btrtl_dev)
+{
+	unsigned char *fw_data = NULL;
+	int ret;
+	u8 *tbuff;
+
+	ret = rtlbt_parse_firmware(hdev, btrtl_dev, &fw_data);
+	if (ret < 0)
+		goto out;
+
+	if (btrtl_dev->cfg_len > 0) {
+		tbuff = kvzalloc(ret + btrtl_dev->cfg_len, GFP_KERNEL);
+		if (!tbuff) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		memcpy(tbuff, fw_data, ret);
+		kvfree(fw_data);
+
+		memcpy(tbuff + ret, btrtl_dev->cfg_data, btrtl_dev->cfg_len);
+		ret += btrtl_dev->cfg_len;
+
+		fw_data = tbuff;
+	}
+
+	rtl_dev_info(hdev, "cfg_sz %d, total sz %d", btrtl_dev->cfg_len, ret);
+
+	ret = rtl_download_firmware(hdev, fw_data, ret);
+
+out:
+	kvfree(fw_data);
+	return ret;
+}
+
+void btrtl_free(struct btrtl_device_info *btrtl_dev)
+{
+	kvfree(btrtl_dev->fw_data);
+	kvfree(btrtl_dev->cfg_data);
+	kfree(btrtl_dev);
+}
+EXPORT_SYMBOL_GPL(btrtl_free);
+
+struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
+					   const char *postfix)
+{
+	struct btrtl_device_info *btrtl_dev;
+	struct sk_buff *skb;
+	struct hci_rp_read_local_version *resp;
+	char cfg_name[40];
+	u16 hci_rev, lmp_subver;
+	u8 hci_ver;
+	int ret;
+
+	btrtl_dev = kzalloc(sizeof(*btrtl_dev), GFP_KERNEL);
+	if (!btrtl_dev) {
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	skb = btrtl_read_local_version(hdev);
+	if (IS_ERR(skb)) {
+		ret = PTR_ERR(skb);
+		goto err_free;
+	}
+
+	resp = (struct hci_rp_read_local_version *)skb->data;
+	rtl_dev_info(hdev, "examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x lmp_subver=%04x",
+		     resp->hci_ver, resp->hci_rev,
+		     resp->lmp_ver, resp->lmp_subver);
+
+	hci_ver = resp->hci_ver;
+	hci_rev = le16_to_cpu(resp->hci_rev);
+	lmp_subver = le16_to_cpu(resp->lmp_subver);
+	kfree_skb(skb);
+
+	btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev, hci_ver,
+					    hdev->bus);
+
+	if (!btrtl_dev->ic_info) {
+		rtl_dev_info(hdev, "unknown IC info, lmp subver %04x, hci rev %04x, hci ver %04x",
+			    lmp_subver, hci_rev, hci_ver);
+		return btrtl_dev;
+	}
+
+	if (btrtl_dev->ic_info->has_rom_version) {
+		ret = rtl_read_rom_version(hdev, &btrtl_dev->rom_version);
+		if (ret)
+			goto err_free;
+	}
+
+	btrtl_dev->fw_len = rtl_load_file(hdev, btrtl_dev->ic_info->fw_name,
+					  &btrtl_dev->fw_data);
+	if (btrtl_dev->fw_len < 0) {
+		rtl_dev_err(hdev, "firmware file %s not found",
+			    btrtl_dev->ic_info->fw_name);
+		ret = btrtl_dev->fw_len;
+		goto err_free;
+	}
+
+	if (btrtl_dev->ic_info->cfg_name) {
+		if (postfix) {
+			snprintf(cfg_name, sizeof(cfg_name), "%s-%s.bin",
+				 btrtl_dev->ic_info->cfg_name, postfix);
+		} else {
+			snprintf(cfg_name, sizeof(cfg_name), "%s.bin",
+				 btrtl_dev->ic_info->cfg_name);
+		}
+		btrtl_dev->cfg_len = rtl_load_file(hdev, cfg_name,
+						   &btrtl_dev->cfg_data);
+		if (btrtl_dev->ic_info->config_needed &&
+		    btrtl_dev->cfg_len <= 0) {
+			rtl_dev_err(hdev, "mandatory config file %s not found",
+				    btrtl_dev->ic_info->cfg_name);
+			ret = btrtl_dev->cfg_len;
+			goto err_free;
+		}
+	}
+
+	return btrtl_dev;
+
+err_free:
+	btrtl_free(btrtl_dev);
+err_alloc:
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(btrtl_initialize);
+
+int btrtl_download_firmware(struct hci_dev *hdev,
+			    struct btrtl_device_info *btrtl_dev)
+{
+	/* 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.
+	 */
+	if (!btrtl_dev->ic_info) {
+		rtl_dev_info(hdev, "assuming no firmware upload needed");
+		return 0;
+	}
+
+	switch (btrtl_dev->ic_info->lmp_subver) {
+	case RTL_ROM_LMP_8723A:
+	case RTL_ROM_LMP_3499:
+		return btrtl_setup_rtl8723a(hdev, btrtl_dev);
+	case RTL_ROM_LMP_8723B:
+	case RTL_ROM_LMP_8821A:
+	case RTL_ROM_LMP_8761A:
+	case RTL_ROM_LMP_8822B:
+		return btrtl_setup_rtl8723b(hdev, btrtl_dev);
+	default:
+		rtl_dev_info(hdev, "assuming no firmware upload needed");
+		return 0;
+	}
+}
+EXPORT_SYMBOL_GPL(btrtl_download_firmware);
+
+int btrtl_setup_realtek(struct hci_dev *hdev)
+{
+	struct btrtl_device_info *btrtl_dev;
+	int ret;
+
+	btrtl_dev = btrtl_initialize(hdev, NULL);
+	if (IS_ERR(btrtl_dev))
+		return PTR_ERR(btrtl_dev);
+
+	ret = btrtl_download_firmware(hdev, btrtl_dev);
+
+	btrtl_free(btrtl_dev);
+
+	/* Enable controller to do both LE scan and BR/EDR inquiry
+	 * simultaneously.
+	 */
+	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(btrtl_setup_realtek);
+
+int btrtl_shutdown_realtek(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	int ret;
+
+	/* According to the vendor driver, BT must be reset on close to avoid
+	 * firmware crash.
+	 */
+	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		ret = PTR_ERR(skb);
+		bt_dev_err(hdev, "HCI reset during shutdown failed");
+		return ret;
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(btrtl_shutdown_realtek);
+
+static unsigned int btrtl_convert_baudrate(u32 device_baudrate)
+{
+	switch (device_baudrate) {
+	case 0x0252a00a:
+		return 230400;
+
+	case 0x05f75004:
+		return 921600;
+
+	case 0x00005004:
+		return 1000000;
+
+	case 0x04928002:
+	case 0x01128002:
+		return 1500000;
+
+	case 0x00005002:
+		return 2000000;
+
+	case 0x0000b001:
+		return 2500000;
+
+	case 0x04928001:
+		return 3000000;
+
+	case 0x052a6001:
+		return 3500000;
+
+	case 0x00005001:
+		return 4000000;
+
+	case 0x0252c014:
+	default:
+		return 115200;
+	}
+}
+
+int btrtl_get_uart_settings(struct hci_dev *hdev,
+			    struct btrtl_device_info *btrtl_dev,
+			    unsigned int *controller_baudrate,
+			    u32 *device_baudrate, bool *flow_control)
+{
+	struct rtl_vendor_config *config;
+	struct rtl_vendor_config_entry *entry;
+	int i, total_data_len;
+	bool found = false;
+
+	total_data_len = btrtl_dev->cfg_len - sizeof(*config);
+	if (total_data_len <= 0) {
+		rtl_dev_warn(hdev, "no config loaded");
+		return -EINVAL;
+	}
+
+	config = (struct rtl_vendor_config *)btrtl_dev->cfg_data;
+	if (le32_to_cpu(config->signature) != RTL_CONFIG_MAGIC) {
+		rtl_dev_err(hdev, "invalid config magic");
+		return -EINVAL;
+	}
+
+	if (total_data_len < le16_to_cpu(config->total_len)) {
+		rtl_dev_err(hdev, "config is too short");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < total_data_len; ) {
+		entry = ((void *)config->entry) + i;
+
+		switch (le16_to_cpu(entry->offset)) {
+		case 0xc:
+			if (entry->len < sizeof(*device_baudrate)) {
+				rtl_dev_err(hdev, "invalid UART config entry");
+				return -EINVAL;
+			}
+
+			*device_baudrate = get_unaligned_le32(entry->data);
+			*controller_baudrate = btrtl_convert_baudrate(
+							*device_baudrate);
+
+			if (entry->len >= 13)
+				*flow_control = !!(entry->data[12] & BIT(2));
+			else
+				*flow_control = false;
+
+			found = true;
+			break;
+
+		default:
+			rtl_dev_dbg(hdev, "skipping config entry 0x%x (len %u)",
+				   le16_to_cpu(entry->offset), entry->len);
+			break;
+		}
+
+		i += sizeof(*entry) + entry->len;
+	}
+
+	if (!found) {
+		rtl_dev_err(hdev, "no UART config entry found");
+		return -ENOENT;
+	}
+
+	rtl_dev_dbg(hdev, "device baudrate = 0x%08x", *device_baudrate);
+	rtl_dev_dbg(hdev, "controller baudrate = %u", *controller_baudrate);
+	rtl_dev_dbg(hdev, "flow control %d", *flow_control);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(btrtl_get_uart_settings);
+
+MODULE_AUTHOR("Daniel Drake <drake@endlessm.com>");
+MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("rtl_bt/rtl8723a_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723b_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723b_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723bs_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723bs_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723ds_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723ds_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761a_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761a_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821a_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821a_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822b_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822b_config.bin");