Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 1568 insertions, 0 deletions

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
new file mode 100644
index 000000000..03fa9409e
--- /dev/null
+++ b/drivers/bluetooth/btrtl.c
@@ -0,0 +1,1568 @@
+// 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 <linux/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_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_ROM_LMP_8922A	0x8922
+#define RTL_CONFIG_MAGIC	0x8723ab55
+
+#define RTL_VSC_OP_COREDUMP	0xfcff
+
+#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, \
+	.lmp_subver = (lmps), \
+	.hci_rev = (hcir), \
+	.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, 0xAD, 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,
+	CHIP_ID_8821A,
+	CHIP_ID_8761A,
+	CHIP_ID_8822B = 8,
+	CHIP_ID_8723D,
+	CHIP_ID_8821C,
+	CHIP_ID_8822C = 13,
+	CHIP_ID_8761B,
+	CHIP_ID_8852A = 18,
+	CHIP_ID_8852B = 20,
+	CHIP_ID_8852C = 25,
+	CHIP_ID_8851B = 36,
+	CHIP_ID_8922A = 44,
+	CHIP_ID_8852BT = 47,
+	CHIP_ID_8761C = 51,
+};
+
+struct id_table {
+	__u16 match_flags;
+	__u16 lmp_subver;
+	__u16 hci_rev;
+	__u8 hci_ver;
+	__u8 hci_bus;
+	__u8 chip_type;
+	bool config_needed;
+	bool has_rom_version;
+	bool has_msft_ext;
+	char *fw_name;
+	char *cfg_name;
+	char *hw_info;
+};
+
+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;
+	bool drop_fw;
+	int project_id;
+	u8 key_id;
+	struct list_head patch_subsecs;
+};
+
+static const struct id_table ic_id_table[] = {
+	/* 8723A */
+	{ IC_INFO(RTL_ROM_LMP_8723A, 0xb, 0x6, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = false,
+	  .fw_name = "rtl_bt/rtl8723a_fw",
+	  .cfg_name = NULL,
+	  .hw_info = "rtl8723au" },
+
+	/* 8723BS */
+	{ IC_INFO(RTL_ROM_LMP_8723B, 0xb, 0x6, HCI_UART),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723bs_fw",
+	  .cfg_name = "rtl_bt/rtl8723bs_config",
+	  .hw_info  = "rtl8723bs" },
+
+	/* 8723B */
+	{ IC_INFO(RTL_ROM_LMP_8723B, 0xb, 0x6, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723b_fw",
+	  .cfg_name = "rtl_bt/rtl8723b_config",
+	  .hw_info  = "rtl8723bu" },
+
+	/* 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",
+	  .cfg_name = "rtl_bt/rtl8723cs_cg_config",
+	  .hw_info  = "rtl8723cs-cg" },
+
+	/* 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",
+	  .cfg_name = "rtl_bt/rtl8723cs_vf_config",
+	  .hw_info  = "rtl8723cs-vf" },
+
+	/* 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",
+	  .cfg_name = "rtl_bt/rtl8723cs_xx_config",
+	  .hw_info  = "rtl8723cs" },
+
+	/* 8723D */
+	{ IC_INFO(RTL_ROM_LMP_8723B, 0xd, 0x8, HCI_USB),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723d_fw",
+	  .cfg_name = "rtl_bt/rtl8723d_config",
+	  .hw_info  = "rtl8723du" },
+
+	/* 8723DS */
+	{ IC_INFO(RTL_ROM_LMP_8723B, 0xd, 0x8, HCI_UART),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8723ds_fw",
+	  .cfg_name = "rtl_bt/rtl8723ds_config",
+	  .hw_info  = "rtl8723ds" },
+
+	/* 8821A */
+	{ IC_INFO(RTL_ROM_LMP_8821A, 0xa, 0x6, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8821a_fw",
+	  .cfg_name = "rtl_bt/rtl8821a_config",
+	  .hw_info  = "rtl8821au" },
+
+	/* 8821C */
+	{ IC_INFO(RTL_ROM_LMP_8821A, 0xc, 0x8, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8821c_fw",
+	  .cfg_name = "rtl_bt/rtl8821c_config",
+	  .hw_info  = "rtl8821cu" },
+
+	/* 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",
+	  .cfg_name = "rtl_bt/rtl8821cs_config",
+	  .hw_info  = "rtl8821cs" },
+
+	/* 8761A */
+	{ IC_INFO(RTL_ROM_LMP_8761A, 0xa, 0x6, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8761a_fw",
+	  .cfg_name = "rtl_bt/rtl8761a_config",
+	  .hw_info  = "rtl8761au" },
+
+	/* 8761B */
+	{ IC_INFO(RTL_ROM_LMP_8761A, 0xb, 0xa, HCI_UART),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8761b_fw",
+	  .cfg_name = "rtl_bt/rtl8761b_config",
+	  .hw_info  = "rtl8761btv" },
+
+	/* 8761BU */
+	{ IC_INFO(RTL_ROM_LMP_8761A, 0xb, 0xa, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8761bu_fw",
+	  .cfg_name = "rtl_bt/rtl8761bu_config",
+	  .hw_info  = "rtl8761bu" },
+
+	/* 8761CU */
+	{ IC_INFO(RTL_ROM_LMP_8761A, 0x0e, 0, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .fw_name  = "rtl_bt/rtl8761cu_fw",
+	  .cfg_name = "rtl_bt/rtl8761cu_config",
+	  .hw_info  = "rtl8761cu" },
+
+	/* 8822C with UART interface */
+	{ IC_INFO(RTL_ROM_LMP_8822B, 0xc, 0x8, HCI_UART),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8822cs_fw",
+	  .cfg_name = "rtl_bt/rtl8822cs_config",
+	  .hw_info  = "rtl8822cs" },
+
+	/* 8822C with UART interface */
+	{ IC_INFO(RTL_ROM_LMP_8822B, 0xc, 0xa, HCI_UART),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8822cs_fw",
+	  .cfg_name = "rtl_bt/rtl8822cs_config",
+	  .hw_info  = "rtl8822cs" },
+
+	/* 8822C with USB interface */
+	{ IC_INFO(RTL_ROM_LMP_8822B, 0xc, 0xa, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8822cu_fw",
+	  .cfg_name = "rtl_bt/rtl8822cu_config",
+	  .hw_info  = "rtl8822cu" },
+
+	/* 8822B */
+	{ IC_INFO(RTL_ROM_LMP_8822B, 0xb, 0x7, HCI_USB),
+	  .config_needed = true,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8822b_fw",
+	  .cfg_name = "rtl_bt/rtl8822b_config",
+	  .hw_info  = "rtl8822bu" },
+
+	/* 8852A */
+	{ IC_INFO(RTL_ROM_LMP_8852A, 0xa, 0xb, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8852au_fw",
+	  .cfg_name = "rtl_bt/rtl8852au_config",
+	  .hw_info  = "rtl8852au" },
+
+	/* 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",
+	  .cfg_name = "rtl_bt/rtl8852bs_config",
+	  .hw_info  = "rtl8852bs" },
+
+	/* 8852B */
+	{ IC_INFO(RTL_ROM_LMP_8852A, 0xb, 0xb, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8852bu_fw",
+	  .cfg_name = "rtl_bt/rtl8852bu_config",
+	  .hw_info  = "rtl8852bu" },
+
+	/* 8852C */
+	{ IC_INFO(RTL_ROM_LMP_8852A, 0xc, 0xc, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8852cu_fw",
+	  .cfg_name = "rtl_bt/rtl8852cu_config",
+	  .hw_info  = "rtl8852cu" },
+
+	/* 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",
+	  .cfg_name = "rtl_bt/rtl8851bu_config",
+	  .hw_info  = "rtl8851bu" },
+
+	/* 8922A */
+	{ IC_INFO(RTL_ROM_LMP_8922A, 0xa, 0xc, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8922au_fw",
+	  .cfg_name = "rtl_bt/rtl8922au_config",
+	  .hw_info  = "rtl8922au" },
+
+	/* 8852BT/8852BE-VT */
+	{ IC_INFO(RTL_ROM_LMP_8852A, 0x87, 0xc, HCI_USB),
+	  .config_needed = false,
+	  .has_rom_version = true,
+	  .has_msft_ext = true,
+	  .fw_name  = "rtl_bt/rtl8852btu_fw",
+	  .cfg_name = "rtl_bt/rtl8852btu_config",
+	  .hw_info  = "rtl8852btu" },
+	};
+
+static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
+					     u8 hci_ver, u8 hci_bus,
+					     u8 chip_type)
+{
+	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) &&
+		    (ic_id_table[i].hci_ver != 0))
+			continue;
+		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;
+	}
+	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 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_obj(*subsec);
+		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 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 */
+	};
+
+	key_id = btrtl_dev->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) {
+		kvfree(ptr);
+		return -EPERM;
+	}
+
+	*_buf = ptr;
+	return len;
+}
+
+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 btrealtek_data *coredump_info = hci_get_priv(hdev);
+	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_8703B, 7 },
+		{ 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 */
+		{ RTL_ROM_LMP_8852A, 18 },	/* 8852A */
+		{ RTL_ROM_LMP_8852A, 20 },	/* 8852B */
+		{ RTL_ROM_LMP_8852A, 25 },	/* 8852C */
+		{ RTL_ROM_LMP_8851B, 36 },	/* 8851B */
+		{ RTL_ROM_LMP_8922A, 44 },	/* 8922A */
+		{ RTL_ROM_LMP_8852A, 47 },	/* 8852BT */
+		{ RTL_ROM_LMP_8761A, 51 },	/* 8761C */
+	};
+
+	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;
+
+	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 firmware file.
+	 * Once we have that, we double-check 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) {
+			btrtl_dev->project_id = project_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;
+	}
+
+	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);
+	coredump_info->rtl_dump.fw_version = le32_to_cpu(epatch_info->fw_version);
+
+	/* 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);
+	if (patch_length < sizeof(epatch_info->fw_version) ||
+	    patch_offset > btrtl_dev->fw_len ||
+	    patch_length > btrtl_dev->fw_len - patch_offset)
+		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;
+	int j = 0;
+	struct sk_buff *skb;
+	struct hci_rp_read_local_version *rp;
+
+	dl_cmd = kmalloc_obj(*dl_cmd);
+	if (!dl_cmd)
+		return -ENOMEM;
+
+	for (i = 0; i < frag_num; i++) {
+		struct sk_buff *skb;
+
+		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 */
+		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 = kvmemdup(fw->data, fw->size, GFP_KERNEL);
+	if (!*buff)
+		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;
+}
+
+static void btrtl_coredump(struct hci_dev *hdev)
+{
+	static const u8 param[] = { 0x00, 0x00 };
+
+	__hci_cmd_send(hdev, RTL_VSC_OP_COREDUMP, sizeof(param), param);
+}
+
+static void btrtl_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btrealtek_data *coredump_info = hci_get_priv(hdev);
+	char buf[80];
+
+	if (coredump_info->rtl_dump.controller)
+		snprintf(buf, sizeof(buf), "Controller Name: %s\n",
+			 coredump_info->rtl_dump.controller);
+	else
+		snprintf(buf, sizeof(buf), "Controller Name: Unknown\n");
+	skb_put_data(skb, buf, strlen(buf));
+
+	snprintf(buf, sizeof(buf), "Firmware Version: 0x%X\n",
+		 coredump_info->rtl_dump.fw_version);
+	skb_put_data(skb, buf, strlen(buf));
+
+	snprintf(buf, sizeof(buf), "Driver: %s\n", coredump_info->rtl_dump.driver_name);
+	skb_put_data(skb, buf, strlen(buf));
+
+	snprintf(buf, sizeof(buf), "Vendor: Realtek\n");
+	skb_put_data(skb, buf, strlen(buf));
+}
+
+static void btrtl_register_devcoredump_support(struct hci_dev *hdev)
+{
+	hci_devcd_register(hdev, btrtl_coredump, btrtl_dmp_hdr, NULL);
+
+}
+
+void btrtl_set_driver_name(struct hci_dev *hdev, const char *driver_name)
+{
+	struct btrealtek_data *coredump_info = hci_get_priv(hdev);
+
+	coredump_info->rtl_dump.driver_name = driver_name;
+}
+EXPORT_SYMBOL_GPL(btrtl_set_driver_name);
+
+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);
+
+struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
+					   const char *postfix)
+{
+	struct btrealtek_data *coredump_info = hci_get_priv(hdev);
+	struct btrtl_device_info *btrtl_dev;
+	struct sk_buff *skb;
+	struct hci_rp_read_local_version *resp;
+	struct hci_command_hdr *cmd;
+	char fw_name[40];
+	char cfg_name[40];
+	u16 hci_rev, lmp_subver;
+	u8 hci_ver, lmp_ver, chip_type = 0;
+	int ret;
+	int rc;
+	u8 key_id;
+	u8 reg_val[2];
+
+	btrtl_dev = kzalloc_obj(*btrtl_dev);
+	if (!btrtl_dev) {
+		ret = -ENOMEM;
+		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);
+		goto err_free;
+	}
+
+	resp = (struct hci_rp_read_local_version *)skb->data;
+
+	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, chip_type);
+
+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) {
+		skb = bt_skb_alloc(sizeof(*cmd), GFP_KERNEL);
+		if (!skb)
+			goto err_free;
+
+		cmd = skb_put(skb, HCI_COMMAND_HDR_SIZE);
+		cmd->opcode = cpu_to_le16(0xfc66);
+		cmd->plen = 0;
+
+		hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
+
+		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);
+
+		goto check_version;
+	}
+
+	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;
+	}
+
+	if (!btrtl_dev->ic_info->fw_name) {
+		ret = -ENOMEM;
+		goto err_free;
+	}
+
+	rc = btrtl_vendor_read_reg16(hdev, RTL_SEC_PROJ, reg_val);
+	if (rc < 0)
+		goto err_free;
+
+	key_id = reg_val[0];
+	btrtl_dev->key_id = key_id;
+	rtl_dev_info(hdev, "%s: key id %u", __func__, key_id);
+
+	btrtl_dev->fw_len = -EIO;
+	if (lmp_subver == RTL_ROM_LMP_8852A && hci_rev == 0x000c) {
+		snprintf(fw_name, sizeof(fw_name), "%s_v2.bin",
+				btrtl_dev->ic_info->fw_name);
+		btrtl_dev->fw_len = rtl_load_file(hdev, fw_name,
+				&btrtl_dev->fw_data);
+	}
+
+	if (btrtl_dev->fw_len < 0) {
+		snprintf(fw_name, sizeof(fw_name), "%s.bin",
+				btrtl_dev->ic_info->fw_name);
+		btrtl_dev->fw_len = rtl_load_file(hdev, 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 && !btrtl_dev->key_id) {
+		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;
+			if (!ret)
+				ret = -EINVAL;
+			goto err_free;
+		}
+	}
+
+	/* The following chips supports the Microsoft vendor extension,
+	 * therefore set the corresponding VsMsftOpCode.
+	 */
+	if (btrtl_dev->ic_info->has_msft_ext)
+		hci_set_msft_opcode(hdev, 0xFCF0);
+
+	if (btrtl_dev->ic_info)
+		coredump_info->rtl_dump.controller = btrtl_dev->ic_info->hw_info;
+
+	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)
+{
+	int err = 0;
+
+	/* 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");
+		err = 0;
+		goto done;
+	}
+
+	switch (btrtl_dev->ic_info->lmp_subver) {
+	case RTL_ROM_LMP_8723A:
+		err = btrtl_setup_rtl8723a(hdev, btrtl_dev);
+		break;
+	case RTL_ROM_LMP_8723B:
+	case RTL_ROM_LMP_8821A:
+	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:
+	case RTL_ROM_LMP_8922A:
+		err = btrtl_setup_rtl8723b(hdev, btrtl_dev);
+		break;
+	default:
+		rtl_dev_info(hdev, "assuming no firmware upload needed");
+		break;
+	}
+
+done:
+	btrtl_register_devcoredump_support(hdev);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(btrtl_download_firmware);
+
+void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
+{
+	/* Enable controller to do both LE scan and BR/EDR inquiry
+	 * simultaneously.
+	 */
+	hci_set_quirk(hdev, HCI_QUIRK_SIMULTANEOUS_DISCOVERY);
+
+	/* Enable central-peripheral role (able to create new connections with
+	 * an existing connection in slave role).
+	 */
+	/* Enable WBS supported for the specific Realtek devices. */
+	switch (btrtl_dev->project_id) {
+	case CHIP_ID_8822C:
+	case CHIP_ID_8852A:
+	case CHIP_ID_8852B:
+	case CHIP_ID_8852C:
+	case CHIP_ID_8851B:
+	case CHIP_ID_8922A:
+	case CHIP_ID_8852BT:
+	case CHIP_ID_8761C:
+		hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);
+
+		/* RTL8852C needs to transmit mSBC data continuously without
+		 * the zero length of USB packets for the ALT 6 supported chips
+		 */
+		if (btrtl_dev->project_id == CHIP_ID_8852C)
+			btrealtek_set_flag(hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP);
+
+		if (btrtl_dev->project_id == CHIP_ID_8852A ||
+		    btrtl_dev->project_id == CHIP_ID_8852B ||
+		    btrtl_dev->project_id == CHIP_ID_8852C)
+			hci_set_quirk(hdev,
+				      HCI_QUIRK_USE_MSFT_EXT_ADDRESS_FILTER);
+
+		hci_set_aosp_capable(hdev);
+		break;
+	default:
+		rtl_dev_dbg(hdev, "Central-peripheral role not enabled.");
+		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
+		 */
+		hci_set_quirk(hdev, HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2);
+		break;
+	default:
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(btrtl_set_quirks);
+
+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_set_quirks(hdev, btrtl_dev);
+
+	if (btrtl_dev->ic_info) {
+		hci_set_hw_info(hdev,
+			"RTL lmp_subver=%u hci_rev=%u hci_ver=%u hci_bus=%u",
+			btrtl_dev->ic_info->lmp_subver,
+			btrtl_dev->ic_info->hci_rev,
+			btrtl_dev->ic_info->hci_ver,
+			btrtl_dev->ic_info->hci_bus);
+	}
+
+	btrtl_free(btrtl_dev);
+	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_CMD_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/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/rtl8723d_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8723d_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/rtl8761b_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761b_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761bu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761bu_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761cu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8761cu_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821a_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821a_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821c_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821c_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821cs_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8821cs_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822b_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822b_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822cs_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822cs_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822cu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8822cu_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8851bu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8851bu_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/rtl8852btu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8852btu_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8852cu_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8852cu_fw_v2.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8852cu_config.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8922au_fw.bin");
+MODULE_FIRMWARE("rtl_bt/rtl8922au_config.bin");