1 files changed, 460 insertions, 42 deletions

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 69c3fe649ca7..2915c82d719d 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -17,19 +17,26 @@
 
 #define VERSION "0.1"
 
+#define RTL_CHIP_8723CS_CG	3
+#define RTL_CHIP_8723CS_VF	4
+#define RTL_CHIP_8723CS_XX	5
 #define RTL_EPATCH_SIGNATURE	"Realtech"
+#define RTL_EPATCH_SIGNATURE_V2	"RTBTCore"
+#define RTL_ROM_LMP_8703B	0x8703
 #define RTL_ROM_LMP_8723A	0x1200
 #define RTL_ROM_LMP_8723B	0x8723
 #define RTL_ROM_LMP_8821A	0x8821
 #define RTL_ROM_LMP_8761A	0x8761
 #define RTL_ROM_LMP_8822B	0x8822
 #define RTL_ROM_LMP_8852A	0x8852
+#define RTL_ROM_LMP_8851B	0x8851
 #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_MATCH_FL_CHIP_TYPE	(1 << 4)
 #define IC_INFO(lmps, hcir, hciv, bus) \
 	.match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV | \
 		       IC_MATCH_FL_HCIVER | IC_MATCH_FL_HCIBUS, \
@@ -38,6 +45,14 @@
 	.hci_ver = (hciv), \
 	.hci_bus = (bus)
 
+#define	RTL_CHIP_SUBVER (&(struct rtl_vendor_cmd) {{0x10, 0x38, 0x04, 0x28, 0x80}})
+#define	RTL_CHIP_REV    (&(struct rtl_vendor_cmd) {{0x10, 0x3A, 0x04, 0x28, 0x80}})
+#define	RTL_SEC_PROJ    (&(struct rtl_vendor_cmd) {{0x10, 0xA4, 0x0D, 0x00, 0xb0}})
+
+#define RTL_PATCH_SNIPPETS		0x01
+#define RTL_PATCH_DUMMY_HEADER		0x02
+#define RTL_PATCH_SECURITY_HEADER	0x03
+
 enum btrtl_chip_id {
 	CHIP_ID_8723A,
 	CHIP_ID_8723B,
@@ -51,6 +66,7 @@ enum btrtl_chip_id {
 	CHIP_ID_8852A = 18,
 	CHIP_ID_8852B = 20,
 	CHIP_ID_8852C = 25,
+	CHIP_ID_8851B = 36,
 };
 
 struct id_table {
@@ -59,6 +75,7 @@ struct id_table {
 	__u16 hci_rev;
 	__u8 hci_ver;
 	__u8 hci_bus;
+	__u8 chip_type;
 	bool config_needed;
 	bool has_rom_version;
 	bool has_msft_ext;
@@ -75,6 +92,8 @@ struct btrtl_device_info {
 	int cfg_len;
 	bool drop_fw;
 	int project_id;
+	u8 key_id;
+	struct list_head patch_subsecs;
 };
 
 static const struct id_table ic_id_table[] = {
@@ -99,6 +118,39 @@ static const struct id_table ic_id_table[] = {
 	  .fw_name  = "rtl_bt/rtl8723b_fw.bin",
 	  .cfg_name = "rtl_bt/rtl8723b_config" },
 
+	/* 8723CS-CG */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8703B,
+	  .chip_type = RTL_CHIP_8723CS_CG,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723cs_cg_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723cs_cg_config" },
+
+	/* 8723CS-VF */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8703B,
+	  .chip_type = RTL_CHIP_8723CS_VF,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723cs_vf_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723cs_vf_config" },
+
+	/* 8723CS-XX */
+	{ .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
+			 IC_MATCH_FL_HCIBUS,
+	  .lmp_subver = RTL_ROM_LMP_8703B,
+	  .chip_type = RTL_CHIP_8723CS_XX,
+	  .hci_bus = HCI_UART,
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723cs_xx_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8723cs_xx_config" },
+
 	/* 8723D */
 	{ IC_INFO(RTL_ROM_LMP_8723B, 0xd, 0x8, HCI_USB),
 	  .config_needed = true,
@@ -128,6 +180,14 @@ static const struct id_table ic_id_table[] = {
 	  .fw_name  = "rtl_bt/rtl8821c_fw.bin",
 	  .cfg_name = "rtl_bt/rtl8821c_config" },
 
+	/* 8821CS */
+	{ IC_INFO(RTL_ROM_LMP_8821A, 0xc, 0x8, HCI_UART),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8821cs_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8821cs_config" },
+
 	/* 8761A */
 	{ IC_INFO(RTL_ROM_LMP_8761A, 0xa, 0x6, HCI_USB),
 	  .config_needed = false,
@@ -190,6 +250,14 @@ static const struct id_table ic_id_table[] = {
 	  .fw_name  = "rtl_bt/rtl8852au_fw.bin",
 	  .cfg_name = "rtl_bt/rtl8852au_config" },
 
+	/* 8852B with UART interface */
+	{ IC_INFO(RTL_ROM_LMP_8852A, 0xb, 0xb, HCI_UART),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8852bs_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8852bs_config" },
+
 	/* 8852B */
 	{ IC_INFO(RTL_ROM_LMP_8852A, 0xb, 0xb, HCI_USB),
 	  .config_needed = false,
@@ -205,10 +273,19 @@ static const struct id_table ic_id_table[] = {
 	  .has_msft_ext = true,
 	  .fw_name  = "rtl_bt/rtl8852cu_fw.bin",
 	  .cfg_name = "rtl_bt/rtl8852cu_config" },
+
+	/* 8851B */
+	{ IC_INFO(RTL_ROM_LMP_8851B, 0xb, 0xc, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = false,
+	  .fw_name  = "rtl_bt/rtl8851bu_fw.bin",
+	  .cfg_name = "rtl_bt/rtl8851bu_config" },
 	};
 
 static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
-					     u8 hci_ver, u8 hci_bus)
+					     u8 hci_ver, u8 hci_bus,
+					     u8 chip_type)
 {
 	int i;
 
@@ -225,6 +302,9 @@ static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
 		if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIBUS) &&
 		    (ic_id_table[i].hci_bus != hci_bus))
 			continue;
+		if ((ic_id_table[i].match_flags & IC_MATCH_FL_CHIP_TYPE) &&
+		    (ic_id_table[i].chip_type != chip_type))
+			continue;
 
 		break;
 	}
@@ -284,6 +364,227 @@ static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version)
 	return 0;
 }
 
+static int btrtl_vendor_read_reg16(struct hci_dev *hdev,
+				   struct rtl_vendor_cmd *cmd, u8 *rp)
+{
+	struct sk_buff *skb;
+	int err = 0;
+
+	skb = __hci_cmd_sync(hdev, 0xfc61, sizeof(*cmd), cmd,
+			     HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		rtl_dev_err(hdev, "RTL: Read reg16 failed (%d)", err);
+		return err;
+	}
+
+	if (skb->len != 3 || skb->data[0]) {
+		bt_dev_err(hdev, "RTL: Read reg16 length mismatch");
+		kfree_skb(skb);
+		return -EIO;
+	}
+
+	if (rp)
+		memcpy(rp, skb->data + 1, 2);
+
+	kfree_skb(skb);
+
+	return 0;
+}
+
+static void *rtl_iov_pull_data(struct rtl_iovec *iov, u32 len)
+{
+	void *data = iov->data;
+
+	if (iov->len < len)
+		return NULL;
+
+	iov->data += len;
+	iov->len  -= len;
+
+	return data;
+}
+
+static void btrtl_insert_ordered_subsec(struct rtl_subsection *node,
+					struct btrtl_device_info *btrtl_dev)
+{
+	struct list_head *pos;
+	struct list_head *next;
+	struct rtl_subsection *subsec;
+
+	list_for_each_safe(pos, next, &btrtl_dev->patch_subsecs) {
+		subsec = list_entry(pos, struct rtl_subsection, list);
+		if (subsec->prio >= node->prio)
+			break;
+	}
+	__list_add(&node->list, pos->prev, pos);
+}
+
+static int btrtl_parse_section(struct hci_dev *hdev,
+			       struct btrtl_device_info *btrtl_dev, u32 opcode,
+			       u8 *data, u32 len)
+{
+	struct rtl_section_hdr *hdr;
+	struct rtl_subsection *subsec;
+	struct rtl_common_subsec *common_subsec;
+	struct rtl_sec_hdr *sec_hdr;
+	int i;
+	u8 *ptr;
+	u16 num_subsecs;
+	u32 subsec_len;
+	int rc = 0;
+	struct rtl_iovec iov = {
+		.data = data,
+		.len  = len,
+	};
+
+	hdr = rtl_iov_pull_data(&iov, sizeof(*hdr));
+	if (!hdr)
+		return -EINVAL;
+	num_subsecs = le16_to_cpu(hdr->num);
+
+	for (i = 0; i < num_subsecs; i++) {
+		common_subsec = rtl_iov_pull_data(&iov, sizeof(*common_subsec));
+		if (!common_subsec)
+			break;
+		subsec_len = le32_to_cpu(common_subsec->len);
+
+		rtl_dev_dbg(hdev, "subsec, eco 0x%02x, len %08x",
+			    common_subsec->eco, subsec_len);
+
+		ptr = rtl_iov_pull_data(&iov, subsec_len);
+		if (!ptr)
+			break;
+
+		if (common_subsec->eco != btrtl_dev->rom_version + 1)
+			continue;
+
+		switch (opcode) {
+		case RTL_PATCH_SECURITY_HEADER:
+			sec_hdr = (void *)common_subsec;
+			if (sec_hdr->key_id != btrtl_dev->key_id)
+				continue;
+			break;
+		}
+
+		subsec = kzalloc(sizeof(*subsec), GFP_KERNEL);
+		if (!subsec)
+			return -ENOMEM;
+		subsec->opcode = opcode;
+		subsec->prio = common_subsec->prio;
+		subsec->len  = subsec_len;
+		subsec->data = ptr;
+		btrtl_insert_ordered_subsec(subsec, btrtl_dev);
+		rc  += subsec_len;
+	}
+
+	return rc;
+}
+
+static int rtlbt_parse_firmware_v2(struct hci_dev *hdev,
+				   struct btrtl_device_info *btrtl_dev,
+				   unsigned char **_buf)
+{
+	struct rtl_epatch_header_v2 *hdr;
+	int rc;
+	u8 reg_val[2];
+	u8 key_id;
+	u32 num_sections;
+	struct rtl_section *section;
+	struct rtl_subsection *entry, *tmp;
+	u32 section_len;
+	u32 opcode;
+	int len = 0;
+	int i;
+	u8 *ptr;
+	struct rtl_iovec iov = {
+		.data = btrtl_dev->fw_data,
+		.len  = btrtl_dev->fw_len - 7, /* Cut the tail */
+	};
+
+	rc = btrtl_vendor_read_reg16(hdev, RTL_SEC_PROJ, reg_val);
+	if (rc < 0)
+		return -EIO;
+	key_id = reg_val[0];
+
+	rtl_dev_dbg(hdev, "%s: key id %u", __func__, key_id);
+
+	btrtl_dev->key_id = key_id;
+
+	hdr = rtl_iov_pull_data(&iov, sizeof(*hdr));
+	if (!hdr)
+		return -EINVAL;
+	num_sections = le32_to_cpu(hdr->num_sections);
+
+	rtl_dev_dbg(hdev, "FW version %08x-%08x", *((u32 *)hdr->fw_version),
+		    *((u32 *)(hdr->fw_version + 4)));
+
+	for (i = 0; i < num_sections; i++) {
+		section = rtl_iov_pull_data(&iov, sizeof(*section));
+		if (!section)
+			break;
+		section_len = le32_to_cpu(section->len);
+		opcode      = le32_to_cpu(section->opcode);
+
+		rtl_dev_dbg(hdev, "opcode 0x%04x", section->opcode);
+
+		ptr = rtl_iov_pull_data(&iov, section_len);
+		if (!ptr)
+			break;
+
+		switch (opcode) {
+		case RTL_PATCH_SNIPPETS:
+			rc = btrtl_parse_section(hdev, btrtl_dev, opcode,
+						 ptr, section_len);
+			break;
+		case RTL_PATCH_SECURITY_HEADER:
+			/* If key_id from chip is zero, ignore all security
+			 * headers.
+			 */
+			if (!key_id)
+				break;
+			rc = btrtl_parse_section(hdev, btrtl_dev, opcode,
+						 ptr, section_len);
+			break;
+		case RTL_PATCH_DUMMY_HEADER:
+			rc = btrtl_parse_section(hdev, btrtl_dev, opcode,
+						 ptr, section_len);
+			break;
+		default:
+			rc = 0;
+			break;
+		}
+		if (rc < 0) {
+			rtl_dev_err(hdev, "RTL: Parse section (%u) err %d",
+				    opcode, rc);
+			return rc;
+		}
+		len += rc;
+	}
+
+	if (!len)
+		return -ENODATA;
+
+	/* Allocate mem and copy all found subsecs. */
+	ptr = kvmalloc(len, GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	len = 0;
+	list_for_each_entry_safe(entry, tmp, &btrtl_dev->patch_subsecs, list) {
+		rtl_dev_dbg(hdev, "RTL: opcode %08x, addr %p, len 0x%x",
+			    entry->opcode, entry->data, entry->len);
+		memcpy(ptr + len, entry->data, entry->len);
+		len += entry->len;
+	}
+
+	if (!len)
+		return -EPERM;
+
+	*_buf = ptr;
+	return len;
+}
+
 static int rtlbt_parse_firmware(struct hci_dev *hdev,
 				struct btrtl_device_info *btrtl_dev,
 				unsigned char **_buf)
@@ -307,6 +608,7 @@ static int rtlbt_parse_firmware(struct hci_dev *hdev,
 		{ RTL_ROM_LMP_8723B, 1 },
 		{ RTL_ROM_LMP_8821A, 2 },
 		{ RTL_ROM_LMP_8761A, 3 },
+		{ RTL_ROM_LMP_8703B, 7 },
 		{ RTL_ROM_LMP_8822B, 8 },
 		{ RTL_ROM_LMP_8723B, 9 },	/* 8723D */
 		{ RTL_ROM_LMP_8821A, 10 },	/* 8821C */
@@ -315,9 +617,21 @@ static int rtlbt_parse_firmware(struct hci_dev *hdev,
 		{ RTL_ROM_LMP_8852A, 18 },	/* 8852A */
 		{ RTL_ROM_LMP_8852A, 20 },	/* 8852B */
 		{ RTL_ROM_LMP_8852A, 25 },	/* 8852C */
+		{ RTL_ROM_LMP_8851B, 36 },	/* 8851B */
 	};
 
-	min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;
+	if (btrtl_dev->fw_len <= 8)
+		return -EINVAL;
+
+	if (!memcmp(btrtl_dev->fw_data, RTL_EPATCH_SIGNATURE, 8))
+		min_size = sizeof(struct rtl_epatch_header) +
+				sizeof(extension_sig) + 3;
+	else if (!memcmp(btrtl_dev->fw_data, RTL_EPATCH_SIGNATURE_V2, 8))
+		min_size = sizeof(struct rtl_epatch_header_v2) +
+				sizeof(extension_sig) + 3;
+	else
+		return -EINVAL;
+
 	if (btrtl_dev->fw_len < min_size)
 		return -EINVAL;
 
@@ -382,12 +696,14 @@ static int rtlbt_parse_firmware(struct hci_dev *hdev,
 		return -EINVAL;
 	}
 
-	epatch_info = (struct rtl_epatch_header *)btrtl_dev->fw_data;
-	if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) {
+	if (memcmp(btrtl_dev->fw_data, RTL_EPATCH_SIGNATURE, 8) != 0) {
+		if (!memcmp(btrtl_dev->fw_data, RTL_EPATCH_SIGNATURE_V2, 8))
+			return rtlbt_parse_firmware_v2(hdev, btrtl_dev, _buf);
 		rtl_dev_err(hdev, "bad EPATCH signature");
 		return -EINVAL;
 	}
 
+	epatch_info = (struct rtl_epatch_header *)btrtl_dev->fw_data;
 	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);
@@ -451,6 +767,7 @@ static int rtl_download_firmware(struct hci_dev *hdev,
 	int frag_len = RTL_FRAG_LEN;
 	int ret = 0;
 	int i;
+	int j = 0;
 	struct sk_buff *skb;
 	struct hci_rp_read_local_version *rp;
 
@@ -461,17 +778,16 @@ static int rtl_download_firmware(struct hci_dev *hdev,
 	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;
+		dl_cmd->index = j++;
+		if (dl_cmd->index == 0x7f)
+			j = 1;
 
 		if (i == (frag_num - 1)) {
 			dl_cmd->index |= 0x80; /* data end */
 			frag_len = fw_len % RTL_FRAG_LEN;
 		}
+		rtl_dev_dbg(hdev, "download fw (%d/%d). index = %d", i,
+				frag_num, dl_cmd->index);
 		memcpy(dl_cmd->data, data, frag_len);
 
 		/* Send download command */
@@ -587,10 +903,60 @@ out:
 	return ret;
 }
 
+static bool rtl_has_chip_type(u16 lmp_subver)
+{
+	switch (lmp_subver) {
+	case RTL_ROM_LMP_8703B:
+		return true;
+	default:
+		break;
+	}
+
+	return  false;
+}
+
+static int rtl_read_chip_type(struct hci_dev *hdev, u8 *type)
+{
+	struct rtl_chip_type_evt *chip_type;
+	struct sk_buff *skb;
+	const unsigned char cmd_buf[] = {0x00, 0x94, 0xa0, 0x00, 0xb0};
+
+	/* Read RTL chip type command */
+	skb = __hci_cmd_sync(hdev, 0xfc61, 5, cmd_buf, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		rtl_dev_err(hdev, "Read chip type failed (%ld)",
+			    PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	chip_type = skb_pull_data(skb, sizeof(*chip_type));
+	if (!chip_type) {
+		rtl_dev_err(hdev, "RTL chip type event length mismatch");
+		kfree_skb(skb);
+		return -EIO;
+	}
+
+	rtl_dev_info(hdev, "chip_type status=%x type=%x",
+		     chip_type->status, chip_type->type);
+
+	*type = chip_type->type & 0x0f;
+
+	kfree_skb(skb);
+	return 0;
+}
+
 void btrtl_free(struct btrtl_device_info *btrtl_dev)
 {
+	struct rtl_subsection *entry, *tmp;
+
 	kvfree(btrtl_dev->fw_data);
 	kvfree(btrtl_dev->cfg_data);
+
+	list_for_each_entry_safe(entry, tmp, &btrtl_dev->patch_subsecs, list) {
+		list_del(&entry->list);
+		kfree(entry);
+	}
+
 	kfree(btrtl_dev);
 }
 EXPORT_SYMBOL_GPL(btrtl_free);
@@ -603,10 +969,11 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 	struct hci_rp_read_local_version *resp;
 	char cfg_name[40];
 	u16 hci_rev, lmp_subver;
-	u8 hci_ver;
+	u8 hci_ver, lmp_ver, chip_type = 0;
 	int ret;
 	u16 opcode;
 	u8 cmd[2];
+	u8 reg_val[2];
 
 	btrtl_dev = kzalloc(sizeof(*btrtl_dev), GFP_KERNEL);
 	if (!btrtl_dev) {
@@ -614,6 +981,31 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 		goto err_alloc;
 	}
 
+	INIT_LIST_HEAD(&btrtl_dev->patch_subsecs);
+
+check_version:
+	ret = btrtl_vendor_read_reg16(hdev, RTL_CHIP_SUBVER, reg_val);
+	if (ret < 0)
+		goto err_free;
+	lmp_subver = get_unaligned_le16(reg_val);
+
+	if (lmp_subver == RTL_ROM_LMP_8822B) {
+		ret = btrtl_vendor_read_reg16(hdev, RTL_CHIP_REV, reg_val);
+		if (ret < 0)
+			goto err_free;
+		hci_rev = get_unaligned_le16(reg_val);
+
+		/* 8822E */
+		if (hci_rev == 0x000e) {
+			hci_ver = 0x0c;
+			lmp_ver = 0x0c;
+			btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev,
+							    hci_ver, hdev->bus,
+							    chip_type);
+			goto next;
+		}
+	}
+
 	skb = btrtl_read_local_version(hdev);
 	if (IS_ERR(skb)) {
 		ret = PTR_ERR(skb);
@@ -621,19 +1013,32 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 	}
 
 	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);
+	hci_ver    = resp->hci_ver;
+	hci_rev    = le16_to_cpu(resp->hci_rev);
+	lmp_ver    = resp->lmp_ver;
 	lmp_subver = le16_to_cpu(resp->lmp_subver);
 
+	kfree_skb(skb);
+
+	if (rtl_has_chip_type(lmp_subver)) {
+		ret = rtl_read_chip_type(hdev, &chip_type);
+		if (ret)
+			goto err_free;
+	}
+
 	btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev, hci_ver,
-					    hdev->bus);
+					    hdev->bus, chip_type);
 
-	if (!btrtl_dev->ic_info)
+next:
+	rtl_dev_info(hdev, "examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x lmp_subver=%04x",
+		     hci_ver, hci_rev,
+		     lmp_ver, lmp_subver);
+
+	if (!btrtl_dev->ic_info && !btrtl_dev->drop_fw)
 		btrtl_dev->drop_fw = true;
+	else
+		btrtl_dev->drop_fw = false;
 
 	if (btrtl_dev->drop_fw) {
 		opcode = hci_opcode_pack(0x3f, 0x66);
@@ -642,41 +1047,25 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 
 		skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
 		if (!skb)
-			goto out_free;
+			goto err_free;
 
 		skb_put_data(skb, cmd, sizeof(cmd));
 		hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
 
-		hdev->send(hdev, skb);
+		ret = hdev->send(hdev, skb);
+		if (ret < 0) {
+			bt_dev_err(hdev, "sending frame failed (%d)", ret);
+			kfree_skb(skb);
+			goto err_free;
+		}
 
 		/* Ensure the above vendor command is sent to controller and
 		 * process has done.
 		 */
 		msleep(200);
 
-		/* Read the local version again. Expect to have the vanilla
-		 * version as cold boot.
-		 */
-		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);
-
-		btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev, hci_ver,
-						    hdev->bus);
+		goto check_version;
 	}
-out_free:
-	kfree_skb(skb);
 
 	if (!btrtl_dev->ic_info) {
 		rtl_dev_info(hdev, "unknown IC info, lmp subver %04x, hci rev %04x, hci ver %04x",
@@ -755,6 +1144,8 @@ int btrtl_download_firmware(struct hci_dev *hdev,
 	case RTL_ROM_LMP_8761A:
 	case RTL_ROM_LMP_8822B:
 	case RTL_ROM_LMP_8852A:
+	case RTL_ROM_LMP_8703B:
+	case RTL_ROM_LMP_8851B:
 		return btrtl_setup_rtl8723b(hdev, btrtl_dev);
 	default:
 		rtl_dev_info(hdev, "assuming no firmware upload needed");
@@ -779,6 +1170,7 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
 	case CHIP_ID_8852A:
 	case CHIP_ID_8852B:
 	case CHIP_ID_8852C:
+	case CHIP_ID_8851B:
 		set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
 		set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
 
@@ -795,6 +1187,22 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
 		rtl_dev_dbg(hdev, "WBS supported not enabled.");
 		break;
 	}
+
+	if (!btrtl_dev->ic_info)
+		return;
+
+	switch (btrtl_dev->ic_info->lmp_subver) {
+	case RTL_ROM_LMP_8703B:
+		/* 8723CS reports two pages for local ext features,
+		 * but it doesn't support any features from page 2 -
+		 * it either responds with garbage or with error status
+		 */
+		set_bit(HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2,
+			&hdev->quirks);
+		break;
+	default:
+		break;
+	}
 }
 EXPORT_SYMBOL_GPL(btrtl_set_quirks);
 
@@ -953,6 +1361,12 @@ 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/rtl8723cs_cg_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_cg_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_vf_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_vf_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_xx_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723cs_xx_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723ds_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8723ds_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8761a_fw.bin");
@@ -963,7 +1377,11 @@ MODULE_FIRMWARE("rtl_bt/rtl8822b_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8822b_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8852au_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8852au_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8852bs_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8852bs_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8852bu_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8852bu_config.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8852cu_fw.bin");
 MODULE_FIRMWARE("rtl_bt/rtl8852cu_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8851bu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8851bu_config.bin");