Patchwork [RFC/RFT,2/2] rtk_btusb: A new driver for the Bluetooth portion of the Realtek RTL8723AE chip

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Submitter Larry Finger
Date April 9, 2013, 12:57 a.m.
Message ID <1365469068-4548-3-git-send-email-Larry.Finger@lwfinger.net>
Download mbox | patch
Permalink /patch/234928/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Larry Finger - April 9, 2013, 12:57 a.m.
This driver is similar to btusb, and uses as much of that code as possible.
Those parts that are unique are provided here.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
---
 drivers/bluetooth/Kconfig     |  10 +
 drivers/bluetooth/Makefile    |   1 +
 drivers/bluetooth/rtk_btusb.c | 974 ++++++++++++++++++++++++++++++++++++++++++
 drivers/bluetooth/rtk_btusb.h | 102 +++++
 4 files changed, 1087 insertions(+)
 create mode 100644 drivers/bluetooth/rtk_btusb.c
 create mode 100644 drivers/bluetooth/rtk_btusb.h
Gustavo F. Padovan - April 18, 2013, 10:22 p.m.
Hi Larry,

* Larry Finger <Larry.Finger@lwfinger.net> [2013-04-08 19:57:48 -0500]:

> This driver is similar to btusb, and uses as much of that code as possible.
> Those parts that are unique are provided here.
> 
> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
> ---
>  drivers/bluetooth/Kconfig     |  10 +
>  drivers/bluetooth/Makefile    |   1 +
>  drivers/bluetooth/rtk_btusb.c | 974 ++++++++++++++++++++++++++++++++++++++++++
>  drivers/bluetooth/rtk_btusb.h | 102 +++++
>  4 files changed, 1087 insertions(+)
>  create mode 100644 drivers/bluetooth/rtk_btusb.c
>  create mode 100644 drivers/bluetooth/rtk_btusb.h
> 
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index fdfd61a..11a9e80 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -242,4 +242,14 @@ config BT_WILINK
>  
>  	  Say Y here to compile support for Texas Instrument's WiLink7 driver
>  	  into the kernel or say M to compile it as module.
> +
> +config BT_RTKUSB
> +	tristate "Realtek BT driver for RTL8723AE"
> +	select FW_LOADER
> +	help
> +	  This enables the Bluetooth driver for the Realtek RTL8723AE Wifi/BT
> +	  combo device.
> +
> +	  Say Y here to compile support for these devices into the kernel
> +	  or say M to build it as a module.
>  endmenu
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index 4afae20..167ccc0 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_BT_ATH3K)		+= ath3k.o
>  obj-$(CONFIG_BT_MRVL)		+= btmrvl.o
>  obj-$(CONFIG_BT_MRVL_SDIO)	+= btmrvl_sdio.o
>  obj-$(CONFIG_BT_WILINK)		+= btwilink.o
> +obj-$(CONFIG_BT_RTKUSB)		+= rtk_btusb.o
>  
>  btmrvl-y			:= btmrvl_main.o
>  btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o
> diff --git a/drivers/bluetooth/rtk_btusb.c b/drivers/bluetooth/rtk_btusb.c
> new file mode 100644
> index 0000000..9a12855
> --- /dev/null
> +++ b/drivers/bluetooth/rtk_btusb.c
> @@ -0,0 +1,974 @@
> +/*
> + *
> + *  Realtek Bluetooth USB driver
> + *
> + *  Copyright (C) 2012-2013  Edward Bian <edward_bian@realsil.com.cn>
> + *
> + *  Parts of this routine are copied and modified from btusb, the
> + *  Generic Bluetooth USB driver. In addition, several of the routines
> + *  in btusb are used directly. The btusb code is
> + *  Copyright (C) 2005-2008  Marcel Holtmann <marcel@holtmann.org>
> + *
> + *  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.
> + *
> + *  You should have received a copy of the GNU General Public License
> + *  along with this program; if not, write to the Free Software
> + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/usb.h>
> +#include <linux/firmware.h>
> +#include <linux/suspend.h>
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <linux/completion.h>
> +#include <linux/version.h>
> +#include <linux/pm_runtime.h>
> +
> +#include "btusb.h"
> +#include "rtk_btusb.h"
> +
> +#define VERSION "0.8"
> +
> +static struct usb_driver btusb_driver;
> +
> +static struct patch_info patch_table[] = {
> +	{0, 0x1200, "rtl_bt/rtl8723a.bin", "rtk8723_bt_config", NULL, 0}
> +};
> +
> +static LIST_HEAD(dev_data_list);
> +
> +/*******************************/
> +
> +static struct usb_device_id btusb_table[] = {
> +	{USB_DEVICE(0x0bda, 0x8723)},
> +	{ }
> +};
> +
> +/*******************************/
> +
> +MODULE_DEVICE_TABLE(usb, btusb_table);
> +
> +static int send_hci_cmd(struct xchange_data *xdata)
> +{
> +	int ret_val;
> +
> +	ret_val = usb_control_msg(
> +		xdata->dev_entry->udev, xdata->pipe_out,
> +		0, USB_TYPE_CLASS, 0, 0,
> +		(void *)(xdata->send_pkt),
> +		xdata->pkt_len, MSG_TO);
> +
> +	return ret_val;
> +}
> +
> +static int rcv_hci_evt(struct xchange_data *xdata)
> +{
> +	int ret_len, ret_val;
> +	int i;
> +
> +	while (1) {
> +		for (i = 0; i < 5; i++) {
> +			/*  Try to send USB interrupt message 5 times. */
> +			ret_val = usb_interrupt_msg(
> +				xdata->dev_entry->udev, xdata->pipe_in,
> +				(void *)(xdata->rcv_pkt), PKT_LEN,
> +				&ret_len, MSG_TO);
> +			if (ret_val >= 0)
> +				break;
> +		}
> +		if (ret_val < 0)
> +			return ret_val;
> +
> +		if (CMD_CMP_EVT == xdata->evt_hdr->evt) {
> +			if (xdata->cmd_hdr->opcode == xdata->cmd_cmp->opcode)
> +				return ret_len;
> +		}
> +	}
> +}
> +
> +static int download_data(struct xchange_data *xdata)
> +{
> +	struct download_cp *cmd_para;
> +	struct download_rp *evt_para;
> +	uint8_t *pcur;
> +	int pkt_len, frag_num, frag_len;
> +	int i, ret_val;
> +
> +	cmd_para = (struct download_cp *)xdata->req_para;
> +	evt_para = (struct download_rp *)xdata->rsp_para;
> +	pcur = xdata->fw_data;
> +	pkt_len = CMD_HDR_LEN + sizeof(struct download_cp);
> +	frag_num = xdata->fw_len / PATCH_SEG_MAX + 1;
> +	frag_len = PATCH_SEG_MAX;
> +
> +	for (i = 0; i < frag_num; i++) {
> +		cmd_para->index = i;
> +		if (i == (frag_num - 1)) {
> +			cmd_para->index |= DATA_END;
> +			frag_len = xdata->fw_len % PATCH_SEG_MAX;
> +			pkt_len -= (PATCH_SEG_MAX - frag_len);
> +		}
> +		xdata->cmd_hdr->opcode = cpu_to_le16(DOWNLOAD_OPCODE);
> +		xdata->cmd_hdr->plen = sizeof(uint8_t) + frag_len;
> +		xdata->pkt_len = pkt_len;
> +		memcpy(cmd_para->data, pcur, frag_len);
> +
> +		ret_val = send_hci_cmd(xdata);
> +		if (ret_val < 0)
> +			return ret_val;
> +
> +		ret_val = rcv_hci_evt(xdata);
> +		if (ret_val < 0)
> +			return ret_val;
> +		if (0 != evt_para->status)
> +			return -1;
> +
> +		pcur += PATCH_SEG_MAX;
> +	}
> +
> +	return xdata->fw_len;
> +}
> +
> +static struct dev_data *dev_data_find(struct usb_interface *intf)
> +{
> +	struct dev_data *dev_entry;
> +
> +	list_for_each_entry(dev_entry, &dev_data_list, list_node) {
> +		if (dev_entry->intf == intf)
> +			return dev_entry;
> +	}
> +
> +	return NULL;
> +}
> +
> +static void init_xdata(struct xchange_data *xdata, struct dev_data *dev_entry)
> +{
> +	memset(xdata, 0, sizeof(struct xchange_data));
> +	xdata->dev_entry = dev_entry;
> +	xdata->pipe_in = usb_rcvintpipe(dev_entry->udev, INTR_EP);
> +	xdata->pipe_out = usb_sndctrlpipe(dev_entry->udev, CTRL_EP);
> +	xdata->cmd_hdr = (struct hci_command_hdr *)(xdata->send_pkt);
> +	xdata->evt_hdr = (struct hci_event_hdr *)(xdata->rcv_pkt);
> +	xdata->cmd_cmp = (struct hci_ev_cmd_complete *)(xdata->rcv_pkt +
> +							EVT_HDR_LEN);
> +	xdata->req_para = xdata->send_pkt + CMD_HDR_LEN;
> +	xdata->rsp_para = xdata->rcv_pkt + EVT_HDR_LEN + CMD_CMP_LEN;
> +}
> +
> +static int check_fw_version(struct xchange_data *xdata)
> +{
> +	struct hci_rp_read_local_version *read_ver_rsp;
> +	struct patch_info *patch_entry;
> +	int ret_val;
> +
> +	xdata->cmd_hdr->opcode = cpu_to_le16(HCI_OP_READ_LOCAL_VERSION);
> +	xdata->cmd_hdr->plen = 0;
> +	xdata->pkt_len = CMD_HDR_LEN;
> +
> +	ret_val = send_hci_cmd(xdata);
> +	if (ret_val < 0)
> +		goto version_end;
> +
> +	ret_val = rcv_hci_evt(xdata);
> +	if (ret_val < 0)
> +		goto version_end;
> +
> +	patch_entry = xdata->dev_entry->patch_entry;
> +	read_ver_rsp = (struct hci_rp_read_local_version *)(xdata->rsp_para);
> +	BT_DBG("check_fw_version : read_ver_rsp->lmp_subver = 0x%x",
> +	       le16_to_cpu(read_ver_rsp->lmp_subver));
> +	if (patch_entry->lmp_sub != le16_to_cpu(read_ver_rsp->lmp_subver))
> +		return 1;
> +
> +	ret_val = 0;
> +version_end:
> +	return ret_val;
> +}
> +
> +static void bt_fw_cb(const struct firmware *firmware, void *context)
> +{
> +	struct dev_data *dev_entry = context;
> +
> +	dev_entry->fw = firmware;
> +	if (!firmware)
> +		pr_err("In callback routine, firmware file not available\n");
> +	complete(&dev_entry->firmware_loading_complete);
> +}
> +
> +static int load_firmware(struct dev_data *dev_entry, uint8_t **buff)
> +{
> +#if LOAD_CONFIG
> +	const struct firmware *fw;
> +#endif
> +	struct usb_device *udev;
> +	struct patch_info *patch_entry;
> +	char *fw_name;
> +	int fw_len = 0, ret_val;
> +
> +	udev = dev_entry->udev;
> +	init_completion(&dev_entry->firmware_loading_complete);
> +	patch_entry = dev_entry->patch_entry;
> +	fw_name = patch_entry->patch_name;
> +	BT_DBG("Reading firmware file %s", fw_name);
> +	ret_val = request_firmware_nowait(THIS_MODULE, 1, fw_name, &udev->dev,
> +					  GFP_KERNEL, dev_entry, bt_fw_cb);
> +	if (ret_val < 0)
> +		goto fw_fail;
> +
> +	wait_for_completion(&dev_entry->firmware_loading_complete);
> +	if (!dev_entry->fw)
> +		goto fw_fail;
> +	*buff = kzalloc(dev_entry->fw->size, GFP_KERNEL);
> +	if (NULL == *buff)
> +		goto alloc_fail;
> +	memcpy(*buff, dev_entry->fw->data, dev_entry->fw->size);
> +	fw_len = dev_entry->fw->size;
> +
> +#if LOAD_CONFIG
> +	release_firmware(dev_entry->fw);
> +	fw_name = patch_entry->config_name;
> +	ret_val = request_firmware(&fw, fw_name, &udev->dev);
> +	if (ret_val < 0) {
> +		fw_len = 0;
> +		kfree(*buff);
> +		*buff = NULL;
> +		goto fw_fail;
> +	}
> +
> +	*buff = krealloc(*buff, fw_len + fw->size, GFP_KERNEL);
> +	if (NULL == *buff) {
> +		fw_len = 0;
> +		release_firmware(fw);
> +		goto fw_fail;
> +	}
> +	memcpy(*buff + fw_len, fw->data, fw->size);
> +	fw_len += fw->size;
> +#endif
> +
> +alloc_fail:
> +	release_firmware(dev_entry->fw);
> +fw_fail:
> +	return fw_len;
> +}
> +
> +static int get_firmware(struct xchange_data *xdata)
> +{
> +	struct dev_data	*dev_entry;
> +	struct patch_info *patch_entry;
> +
> +	dev_entry = xdata->dev_entry;
> +	patch_entry = dev_entry->patch_entry;
> +	if (patch_entry->fw_len > 0) {
> +		xdata->fw_data = kzalloc(patch_entry->fw_len, GFP_KERNEL);
> +		if (NULL == xdata->fw_data)
> +			return -ENOMEM;
> +		memcpy(xdata->fw_data, patch_entry->fw_cache,
> +		       patch_entry->fw_len);
> +		xdata->fw_len = patch_entry->fw_len;
> +	} else {
> +		xdata->fw_len = load_firmware(dev_entry, &xdata->fw_data);
> +		if (xdata->fw_len <= 0)
> +			return -1;
> +	}
> +
> +	return 0;
> +}
> +
> +static int download_patch(struct usb_interface *intf)
> +{
> +	struct dev_data		*dev_entry;
> +	uint8_t			*fw_buf;
> +	int			ret_val;
> +
> +	BT_DBG("download_patch start");
> +	dev_entry = dev_data_find(intf);
> +	if (NULL == dev_entry) {
> +		ret_val = -1;
> +		BT_DBG("NULL == dev_entry");
> +		goto patch_end;
> +	}
> +
> +	init_xdata(&dev_entry->xdata, dev_entry);
> +	ret_val = check_fw_version(&dev_entry->xdata);
> +	if (ret_val != 0)
> +		goto patch_end;
> +
> +	ret_val = get_firmware(&dev_entry->xdata);
> +	if (ret_val < 0) {
> +		BT_DBG("get_firmware failed!");
> +		goto patch_end;
> +	}
> +	fw_buf = dev_entry->xdata.fw_data;
> +
> +	ret_val = download_data(&dev_entry->xdata);
> +	if (ret_val < 0) {
> +		BT_DBG("download_data failed!");
> +		goto patch_fail;
> +	}
> +
> +	ret_val = check_fw_version(&dev_entry->xdata);
> +	if (ret_val <= 0) {
> +		ret_val = -1;
> +		goto patch_fail;
> +	}
> +
> +	ret_val = 0;
> +patch_fail:
> +	kfree(fw_buf);
> +patch_end:
> +	BT_DBG("Rtk patch end %d", ret_val);
> +	return ret_val;
> +}
> +
> +static int btusb_open(struct hci_dev *hdev)
> +{
> +	struct btusb_data *data = hci_get_drvdata(hdev);
> +	int err;
> +
> +	BT_DBG("%s", hdev->name);
> +
> +	err = usb_autopm_get_interface(data->intf);
> +	if (err < 0)
> +		return err;
> +
> +	data->intf->needs_remote_wakeup = 1;
> +	BT_DBG("%s start pm_usage_cnt(0x%x)", __func__,
> +		 atomic_read(&(data->intf->pm_usage_cnt)));
> +
> +	/*******************************/
> +	if (0 == atomic_read(&hdev->promisc)) {
> +		BT_DBG("btusb_open hdev->promisc == 0");
> +		err = -1;
> +	}
> +	err = download_patch(data->intf);
> +	if (err < 0)
> +		goto failed;
> +	/*******************************/

We recently added a setup callback to btusb to run device specific
initialization, take a look in bluetooth-next to check how that can help you
avoid duplicate a lot of code.

	Gustavo
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Larry Finger - April 19, 2013, 1:31 a.m.
On 04/18/2013 05:22 PM, Gustavo Padovan wrote:
>
> We recently added a setup callback to btusb to run device specific
> initialization, take a look in bluetooth-next to check how that can help you
> avoid duplicate a lot of code.

Thanks for the tip. I knew something was in the planning stage.

Is there any documentation on using the new facility?

Larry


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Johan Hedberg - April 19, 2013, 7:23 a.m.
Hi Larry,

On Thu, Apr 18, 2013, Larry Finger wrote:
> On 04/18/2013 05:22 PM, Gustavo Padovan wrote:
> >We recently added a setup callback to btusb to run device specific
> >initialization, take a look in bluetooth-next to check how that can help you
> >avoid duplicate a lot of code.
> 
> Thanks for the tip. I knew something was in the planning stage.
> 
> Is there any documentation on using the new facility?

Not really, but you can take a look at the "Bluetooth: Add support for
Intel Bluetooth device [[8087:07dc]" patch that's currently going
through some feedback rounds on linux-bluetooth. It's one of the first
users of this new API.

Basically what you have is the new setup() callback for HCI drivers and
then a new __hci_cmd_sync() function that can be used from within the
setup() callback to synchronously send whatever HCI commands you need to
send before proceeding with the normal HCI init sequence within the HCI
core.

To my understanding Marcel has planned to move the vendor specific btusb
routines into their own files in the long run (I believe he's used a
term "mini driver" for this) but for now the changes are expected to go
to the main btusb.c file.

Johan
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Patch

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index fdfd61a..11a9e80 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -242,4 +242,14 @@  config BT_WILINK
 
 	  Say Y here to compile support for Texas Instrument's WiLink7 driver
 	  into the kernel or say M to compile it as module.
+
+config BT_RTKUSB
+	tristate "Realtek BT driver for RTL8723AE"
+	select FW_LOADER
+	help
+	  This enables the Bluetooth driver for the Realtek RTL8723AE Wifi/BT
+	  combo device.
+
+	  Say Y here to compile support for these devices into the kernel
+	  or say M to build it as a module.
 endmenu
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 4afae20..167ccc0 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -19,6 +19,7 @@  obj-$(CONFIG_BT_ATH3K)		+= ath3k.o
 obj-$(CONFIG_BT_MRVL)		+= btmrvl.o
 obj-$(CONFIG_BT_MRVL_SDIO)	+= btmrvl_sdio.o
 obj-$(CONFIG_BT_WILINK)		+= btwilink.o
+obj-$(CONFIG_BT_RTKUSB)		+= rtk_btusb.o
 
 btmrvl-y			:= btmrvl_main.o
 btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o
diff --git a/drivers/bluetooth/rtk_btusb.c b/drivers/bluetooth/rtk_btusb.c
new file mode 100644
index 0000000..9a12855
--- /dev/null
+++ b/drivers/bluetooth/rtk_btusb.c
@@ -0,0 +1,974 @@ 
+/*
+ *
+ *  Realtek Bluetooth USB driver
+ *
+ *  Copyright (C) 2012-2013  Edward Bian <edward_bian@realsil.com.cn>
+ *
+ *  Parts of this routine are copied and modified from btusb, the
+ *  Generic Bluetooth USB driver. In addition, several of the routines
+ *  in btusb are used directly. The btusb code is
+ *  Copyright (C) 2005-2008  Marcel Holtmann <marcel@holtmann.org>
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/firmware.h>
+#include <linux/suspend.h>
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <linux/completion.h>
+#include <linux/version.h>
+#include <linux/pm_runtime.h>
+
+#include "btusb.h"
+#include "rtk_btusb.h"
+
+#define VERSION "0.8"
+
+static struct usb_driver btusb_driver;
+
+static struct patch_info patch_table[] = {
+	{0, 0x1200, "rtl_bt/rtl8723a.bin", "rtk8723_bt_config", NULL, 0}
+};
+
+static LIST_HEAD(dev_data_list);
+
+/*******************************/
+
+static struct usb_device_id btusb_table[] = {
+	{USB_DEVICE(0x0bda, 0x8723)},
+	{ }
+};
+
+/*******************************/
+
+MODULE_DEVICE_TABLE(usb, btusb_table);
+
+static int send_hci_cmd(struct xchange_data *xdata)
+{
+	int ret_val;
+
+	ret_val = usb_control_msg(
+		xdata->dev_entry->udev, xdata->pipe_out,
+		0, USB_TYPE_CLASS, 0, 0,
+		(void *)(xdata->send_pkt),
+		xdata->pkt_len, MSG_TO);
+
+	return ret_val;
+}
+
+static int rcv_hci_evt(struct xchange_data *xdata)
+{
+	int ret_len, ret_val;
+	int i;
+
+	while (1) {
+		for (i = 0; i < 5; i++) {
+			/*  Try to send USB interrupt message 5 times. */
+			ret_val = usb_interrupt_msg(
+				xdata->dev_entry->udev, xdata->pipe_in,
+				(void *)(xdata->rcv_pkt), PKT_LEN,
+				&ret_len, MSG_TO);
+			if (ret_val >= 0)
+				break;
+		}
+		if (ret_val < 0)
+			return ret_val;
+
+		if (CMD_CMP_EVT == xdata->evt_hdr->evt) {
+			if (xdata->cmd_hdr->opcode == xdata->cmd_cmp->opcode)
+				return ret_len;
+		}
+	}
+}
+
+static int download_data(struct xchange_data *xdata)
+{
+	struct download_cp *cmd_para;
+	struct download_rp *evt_para;
+	uint8_t *pcur;
+	int pkt_len, frag_num, frag_len;
+	int i, ret_val;
+
+	cmd_para = (struct download_cp *)xdata->req_para;
+	evt_para = (struct download_rp *)xdata->rsp_para;
+	pcur = xdata->fw_data;
+	pkt_len = CMD_HDR_LEN + sizeof(struct download_cp);
+	frag_num = xdata->fw_len / PATCH_SEG_MAX + 1;
+	frag_len = PATCH_SEG_MAX;
+
+	for (i = 0; i < frag_num; i++) {
+		cmd_para->index = i;
+		if (i == (frag_num - 1)) {
+			cmd_para->index |= DATA_END;
+			frag_len = xdata->fw_len % PATCH_SEG_MAX;
+			pkt_len -= (PATCH_SEG_MAX - frag_len);
+		}
+		xdata->cmd_hdr->opcode = cpu_to_le16(DOWNLOAD_OPCODE);
+		xdata->cmd_hdr->plen = sizeof(uint8_t) + frag_len;
+		xdata->pkt_len = pkt_len;
+		memcpy(cmd_para->data, pcur, frag_len);
+
+		ret_val = send_hci_cmd(xdata);
+		if (ret_val < 0)
+			return ret_val;
+
+		ret_val = rcv_hci_evt(xdata);
+		if (ret_val < 0)
+			return ret_val;
+		if (0 != evt_para->status)
+			return -1;
+
+		pcur += PATCH_SEG_MAX;
+	}
+
+	return xdata->fw_len;
+}
+
+static struct dev_data *dev_data_find(struct usb_interface *intf)
+{
+	struct dev_data *dev_entry;
+
+	list_for_each_entry(dev_entry, &dev_data_list, list_node) {
+		if (dev_entry->intf == intf)
+			return dev_entry;
+	}
+
+	return NULL;
+}
+
+static void init_xdata(struct xchange_data *xdata, struct dev_data *dev_entry)
+{
+	memset(xdata, 0, sizeof(struct xchange_data));
+	xdata->dev_entry = dev_entry;
+	xdata->pipe_in = usb_rcvintpipe(dev_entry->udev, INTR_EP);
+	xdata->pipe_out = usb_sndctrlpipe(dev_entry->udev, CTRL_EP);
+	xdata->cmd_hdr = (struct hci_command_hdr *)(xdata->send_pkt);
+	xdata->evt_hdr = (struct hci_event_hdr *)(xdata->rcv_pkt);
+	xdata->cmd_cmp = (struct hci_ev_cmd_complete *)(xdata->rcv_pkt +
+							EVT_HDR_LEN);
+	xdata->req_para = xdata->send_pkt + CMD_HDR_LEN;
+	xdata->rsp_para = xdata->rcv_pkt + EVT_HDR_LEN + CMD_CMP_LEN;
+}
+
+static int check_fw_version(struct xchange_data *xdata)
+{
+	struct hci_rp_read_local_version *read_ver_rsp;
+	struct patch_info *patch_entry;
+	int ret_val;
+
+	xdata->cmd_hdr->opcode = cpu_to_le16(HCI_OP_READ_LOCAL_VERSION);
+	xdata->cmd_hdr->plen = 0;
+	xdata->pkt_len = CMD_HDR_LEN;
+
+	ret_val = send_hci_cmd(xdata);
+	if (ret_val < 0)
+		goto version_end;
+
+	ret_val = rcv_hci_evt(xdata);
+	if (ret_val < 0)
+		goto version_end;
+
+	patch_entry = xdata->dev_entry->patch_entry;
+	read_ver_rsp = (struct hci_rp_read_local_version *)(xdata->rsp_para);
+	BT_DBG("check_fw_version : read_ver_rsp->lmp_subver = 0x%x",
+	       le16_to_cpu(read_ver_rsp->lmp_subver));
+	if (patch_entry->lmp_sub != le16_to_cpu(read_ver_rsp->lmp_subver))
+		return 1;
+
+	ret_val = 0;
+version_end:
+	return ret_val;
+}
+
+static void bt_fw_cb(const struct firmware *firmware, void *context)
+{
+	struct dev_data *dev_entry = context;
+
+	dev_entry->fw = firmware;
+	if (!firmware)
+		pr_err("In callback routine, firmware file not available\n");
+	complete(&dev_entry->firmware_loading_complete);
+}
+
+static int load_firmware(struct dev_data *dev_entry, uint8_t **buff)
+{
+#if LOAD_CONFIG
+	const struct firmware *fw;
+#endif
+	struct usb_device *udev;
+	struct patch_info *patch_entry;
+	char *fw_name;
+	int fw_len = 0, ret_val;
+
+	udev = dev_entry->udev;
+	init_completion(&dev_entry->firmware_loading_complete);
+	patch_entry = dev_entry->patch_entry;
+	fw_name = patch_entry->patch_name;
+	BT_DBG("Reading firmware file %s", fw_name);
+	ret_val = request_firmware_nowait(THIS_MODULE, 1, fw_name, &udev->dev,
+					  GFP_KERNEL, dev_entry, bt_fw_cb);
+	if (ret_val < 0)
+		goto fw_fail;
+
+	wait_for_completion(&dev_entry->firmware_loading_complete);
+	if (!dev_entry->fw)
+		goto fw_fail;
+	*buff = kzalloc(dev_entry->fw->size, GFP_KERNEL);
+	if (NULL == *buff)
+		goto alloc_fail;
+	memcpy(*buff, dev_entry->fw->data, dev_entry->fw->size);
+	fw_len = dev_entry->fw->size;
+
+#if LOAD_CONFIG
+	release_firmware(dev_entry->fw);
+	fw_name = patch_entry->config_name;
+	ret_val = request_firmware(&fw, fw_name, &udev->dev);
+	if (ret_val < 0) {
+		fw_len = 0;
+		kfree(*buff);
+		*buff = NULL;
+		goto fw_fail;
+	}
+
+	*buff = krealloc(*buff, fw_len + fw->size, GFP_KERNEL);
+	if (NULL == *buff) {
+		fw_len = 0;
+		release_firmware(fw);
+		goto fw_fail;
+	}
+	memcpy(*buff + fw_len, fw->data, fw->size);
+	fw_len += fw->size;
+#endif
+
+alloc_fail:
+	release_firmware(dev_entry->fw);
+fw_fail:
+	return fw_len;
+}
+
+static int get_firmware(struct xchange_data *xdata)
+{
+	struct dev_data	*dev_entry;
+	struct patch_info *patch_entry;
+
+	dev_entry = xdata->dev_entry;
+	patch_entry = dev_entry->patch_entry;
+	if (patch_entry->fw_len > 0) {
+		xdata->fw_data = kzalloc(patch_entry->fw_len, GFP_KERNEL);
+		if (NULL == xdata->fw_data)
+			return -ENOMEM;
+		memcpy(xdata->fw_data, patch_entry->fw_cache,
+		       patch_entry->fw_len);
+		xdata->fw_len = patch_entry->fw_len;
+	} else {
+		xdata->fw_len = load_firmware(dev_entry, &xdata->fw_data);
+		if (xdata->fw_len <= 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+static int download_patch(struct usb_interface *intf)
+{
+	struct dev_data		*dev_entry;
+	uint8_t			*fw_buf;
+	int			ret_val;
+
+	BT_DBG("download_patch start");
+	dev_entry = dev_data_find(intf);
+	if (NULL == dev_entry) {
+		ret_val = -1;
+		BT_DBG("NULL == dev_entry");
+		goto patch_end;
+	}
+
+	init_xdata(&dev_entry->xdata, dev_entry);
+	ret_val = check_fw_version(&dev_entry->xdata);
+	if (ret_val != 0)
+		goto patch_end;
+
+	ret_val = get_firmware(&dev_entry->xdata);
+	if (ret_val < 0) {
+		BT_DBG("get_firmware failed!");
+		goto patch_end;
+	}
+	fw_buf = dev_entry->xdata.fw_data;
+
+	ret_val = download_data(&dev_entry->xdata);
+	if (ret_val < 0) {
+		BT_DBG("download_data failed!");
+		goto patch_fail;
+	}
+
+	ret_val = check_fw_version(&dev_entry->xdata);
+	if (ret_val <= 0) {
+		ret_val = -1;
+		goto patch_fail;
+	}
+
+	ret_val = 0;
+patch_fail:
+	kfree(fw_buf);
+patch_end:
+	BT_DBG("Rtk patch end %d", ret_val);
+	return ret_val;
+}
+
+static int btusb_open(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+	int err;
+
+	BT_DBG("%s", hdev->name);
+
+	err = usb_autopm_get_interface(data->intf);
+	if (err < 0)
+		return err;
+
+	data->intf->needs_remote_wakeup = 1;
+	BT_DBG("%s start pm_usage_cnt(0x%x)", __func__,
+		 atomic_read(&(data->intf->pm_usage_cnt)));
+
+	/*******************************/
+	if (0 == atomic_read(&hdev->promisc)) {
+		BT_DBG("btusb_open hdev->promisc == 0");
+		err = -1;
+	}
+	err = download_patch(data->intf);
+	if (err < 0)
+		goto failed;
+	/*******************************/
+
+	if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
+		goto done;
+
+	if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags))
+		goto done;
+
+	err = btusb_submit_intr_urb(hdev, GFP_KERNEL);
+	if (err < 0)
+		goto failed;
+
+	err = btusb_submit_bulk_urb(hdev, GFP_KERNEL);
+	if (err < 0) {
+		mdelay(URB_CANCELING_DELAY_MS);      /*  Added by Realtek */
+		usb_kill_anchored_urbs(&data->intr_anchor);
+		goto failed;
+	}
+
+	set_bit(BTUSB_BULK_RUNNING, &data->flags);
+	btusb_submit_bulk_urb(hdev, GFP_KERNEL);
+
+done:
+	usb_autopm_put_interface(data->intf);
+	BT_DBG("%s end  pm_usage_cnt(0x%x)", __func__,
+		  atomic_read(&(data->intf->pm_usage_cnt)));
+
+	return 0;
+
+failed:
+	clear_bit(BTUSB_INTR_RUNNING, &data->flags);
+	clear_bit(HCI_RUNNING, &hdev->flags);
+	usb_autopm_put_interface(data->intf);
+	BT_DBG("%s failed  pm_usage_cnt(0x%x)", __func__,
+		  atomic_read(&(data->intf->pm_usage_cnt)));
+	return err;
+}
+
+static int btusb_close(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+	int i, err;
+
+	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
+		return 0;
+
+	BT_DBG("btusb_close");
+	/*******************************/
+	for (i = 0; i < NUM_REASSEMBLY; i++) {
+		if (hdev->reassembly[i])	{
+			kfree_skb(hdev->reassembly[i]);
+			hdev->reassembly[i] = NULL;
+			BT_DBG("%s free ressembly i =%d", __func__, i);
+		}
+	}
+	/*******************************/
+	cancel_work_sync(&data->work);
+	cancel_work_sync(&data->waker);
+
+	clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
+	clear_bit(BTUSB_BULK_RUNNING, &data->flags);
+	clear_bit(BTUSB_INTR_RUNNING, &data->flags);
+
+	btusb_stop_traffic(data);
+	err = usb_autopm_get_interface(data->intf);
+	if (err < 0)
+		goto failed;
+
+	data->intf->needs_remote_wakeup = 0;
+	usb_autopm_put_interface(data->intf);
+
+failed:
+	mdelay(URB_CANCELING_DELAY_MS);     /*  Added by Realtek */
+	usb_scuttle_anchored_urbs(&data->deferred);
+	return 0;
+}
+
+static inline int __set_isoc_interface(struct hci_dev *hdev, int altsetting)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+	struct usb_interface *intf = data->isoc;
+	struct usb_endpoint_descriptor *ep_desc;
+	int i, err;
+
+	if (!data->isoc)
+		return -ENODEV;
+
+	err = usb_set_interface(data->udev, 1, altsetting);
+	if (err < 0) {
+		BT_ERR("%s setting interface failed (%d)", hdev->name, -err);
+		return err;
+	}
+
+	data->isoc_altsetting = altsetting;
+
+	data->isoc_tx_ep = NULL;
+	data->isoc_rx_ep = NULL;
+
+	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
+		ep_desc = &intf->cur_altsetting->endpoint[i].desc;
+
+		if (!data->isoc_tx_ep && usb_endpoint_is_isoc_out(ep_desc)) {
+			data->isoc_tx_ep = ep_desc;
+			continue;
+		}
+
+		if (!data->isoc_rx_ep && usb_endpoint_is_isoc_in(ep_desc)) {
+			data->isoc_rx_ep = ep_desc;
+			continue;
+		}
+	}
+
+	if (!data->isoc_tx_ep || !data->isoc_rx_ep) {
+		BT_ERR("%s invalid SCO descriptors", hdev->name);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void btusb_work(struct work_struct *work)
+{
+	struct btusb_data *data = container_of(work, struct btusb_data, work);
+	struct hci_dev *hdev = data->hdev;
+	int err;
+
+	if (hdev->conn_hash.sco_num > 0) {
+		if (!test_bit(BTUSB_DID_ISO_RESUME, &data->flags)) {
+			err = usb_autopm_get_interface(data->isoc ? data->isoc :
+						       data->intf);
+			if (err < 0) {
+				clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
+				/*  Delay added by Realtek */
+				mdelay(URB_CANCELING_DELAY_MS);
+				usb_kill_anchored_urbs(&data->isoc_anchor);
+				return;
+			}
+
+			set_bit(BTUSB_DID_ISO_RESUME, &data->flags);
+		}
+		if (data->isoc_altsetting != 2) {
+			clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
+			mdelay(URB_CANCELING_DELAY_MS);  /*  Added by Realtek */
+			usb_kill_anchored_urbs(&data->isoc_anchor);
+
+			if (__set_isoc_interface(hdev, 2) < 0)
+				return;
+		}
+
+		if (!test_and_set_bit(BTUSB_ISOC_RUNNING, &data->flags)) {
+			if (btusb_submit_isoc_urb(hdev, GFP_KERNEL) < 0)
+				clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
+			else
+				btusb_submit_isoc_urb(hdev, GFP_KERNEL);
+		}
+	} else {
+		clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
+		mdelay(URB_CANCELING_DELAY_MS);      /*  Added by Realtek */
+		usb_kill_anchored_urbs(&data->isoc_anchor);
+
+		__set_isoc_interface(hdev, 0);
+		if (test_and_clear_bit(BTUSB_DID_ISO_RESUME, &data->flags))
+			usb_autopm_put_interface(data->isoc ? data->isoc :
+						 data->intf);
+	}
+}
+
+static struct patch_info *get_patch_entry(struct usb_device *udev)
+{
+	struct patch_info	*patch_entry;
+	uint16_t	pid;
+
+	patch_entry = patch_table;
+	pid = le16_to_cpu(udev->descriptor.idProduct);
+	while (pid != patch_entry->prod_id) {
+		if (0 == patch_entry->prod_id)
+			break;
+		patch_entry++;
+	}
+
+	return patch_entry;
+}
+
+static int rtkbt_pm_notify(struct notifier_block *notifier, ulong pm_event,
+		    void *unused)
+{
+	struct dev_data	*dev_entry;
+	struct patch_info	*patch_entry;
+	struct usb_device *udev;
+
+	dev_entry = container_of(notifier, struct dev_data, pm_notifier);
+	patch_entry = dev_entry->patch_entry;
+	udev = dev_entry->udev;
+	BT_DBG("rtkbt_pm_notify pm_event =%ld", pm_event);
+	switch (pm_event) {
+	case PM_SUSPEND_PREPARE:
+	case PM_HIBERNATION_PREPARE:
+		patch_entry->fw_len = load_firmware(dev_entry,
+						    &patch_entry->fw_cache);
+		if (patch_entry->fw_len <= 0) {
+			BT_DBG("rtkbt_pm_notify return NOTIFY_BAD");
+			return NOTIFY_BAD;
+		}
+
+		if (!device_may_wakeup(&udev->dev)) {
+			dev_entry->intf->needs_binding = 1;
+			BT_DBG("remote wakeup not support, set intf->needs_binding = 1");
+		}
+		break;
+	case PM_POST_SUSPEND:
+	case PM_POST_HIBERNATION:
+	case PM_POST_RESTORE:
+		if (patch_entry->fw_len > 0) {
+			kfree(patch_entry->fw_cache);
+			patch_entry->fw_cache = NULL;
+			patch_entry->fw_len = 0;
+		}
+#if BTUSB_RPM
+		usb_disable_autosuspend(udev);
+		usb_enable_autosuspend(udev);
+		pm_runtime_set_autosuspend_delay(&(udev->dev), 2000);
+#endif
+		break;
+
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int patch_add(struct usb_interface *intf)
+{
+	struct dev_data	*dev_entry;
+	struct usb_device *udev;
+
+	BT_DBG("patch_add");
+	dev_entry = dev_data_find(intf);
+	if (NULL != dev_entry)
+		return -1;
+
+	udev = interface_to_usbdev(intf);
+#if BTUSB_RPM
+	BT_DBG("auto suspend is enabled");
+	usb_enable_autosuspend(udev);
+	pm_runtime_set_autosuspend_delay(&(udev->dev), 2000);
+#endif
+
+	dev_entry = kzalloc(sizeof(struct dev_data), GFP_KERNEL);
+	dev_entry->intf = intf;
+	dev_entry->udev = udev;
+	dev_entry->pm_notifier.notifier_call = rtkbt_pm_notify;
+	dev_entry->patch_entry = get_patch_entry(udev);
+	list_add(&dev_entry->list_node, &dev_data_list);
+	register_pm_notifier(&dev_entry->pm_notifier);
+
+	return 0;
+}
+
+static int btusb_probe(struct usb_interface *intf,
+				const struct usb_device_id *id)
+{
+	struct usb_endpoint_descriptor *ep_desc;
+	struct btusb_data *data;
+	struct hci_dev *hdev;
+	int i, err, flag1, flag2;
+	struct usb_device *udev;
+	udev = interface_to_usbdev(intf);
+
+	BT_DBG("Realtek Bluetooth USB driver ver %s", VERSION);
+
+	/* interface numbers are hardcoded in the spec */
+	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
+		return -ENODEV;
+
+	/*******************************/
+	flag1 = device_can_wakeup(&udev->dev);
+	flag2 = device_may_wakeup(&udev->dev);
+	BT_DBG("btusb_probe 1 ========== can_wakeup =%x	 flag2 =%x",
+	       flag1, flag2);
+	device_wakeup_disable(&udev->dev);
+	flag1 = device_can_wakeup(&udev->dev);
+	flag2 = device_may_wakeup(&udev->dev);
+	BT_DBG("wakeup_disable ========== can_wakeup =%x	 flag2 =%x",
+	       flag1, flag2);
+	err = patch_add(intf);
+	if (err < 0)
+		return -1;
+	/*******************************/
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+
+	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
+		ep_desc = &intf->cur_altsetting->endpoint[i].desc;
+
+		if (!data->intr_ep && usb_endpoint_is_int_in(ep_desc)) {
+			data->intr_ep = ep_desc;
+			continue;
+		}
+
+		if (!data->bulk_tx_ep && usb_endpoint_is_bulk_out(ep_desc)) {
+			data->bulk_tx_ep = ep_desc;
+			continue;
+		}
+
+		if (!data->bulk_rx_ep && usb_endpoint_is_bulk_in(ep_desc)) {
+			data->bulk_rx_ep = ep_desc;
+			continue;
+		}
+	}
+
+	if (!data->intr_ep || !data->bulk_tx_ep || !data->bulk_rx_ep) {
+		kfree(data);
+		return -ENODEV;
+	}
+
+	data->cmdreq_type = USB_TYPE_CLASS;
+
+	data->udev = interface_to_usbdev(intf);
+	data->intf = intf;
+
+	spin_lock_init(&data->lock);
+
+	INIT_WORK(&data->work, btusb_work);
+	INIT_WORK(&data->waker, btusb_waker);
+	spin_lock_init(&data->txlock);
+
+	init_usb_anchor(&data->tx_anchor);
+	init_usb_anchor(&data->intr_anchor);
+	init_usb_anchor(&data->bulk_anchor);
+	init_usb_anchor(&data->isoc_anchor);
+	init_usb_anchor(&data->deferred);
+
+	hdev = hci_alloc_dev();
+	if (!hdev) {
+		kfree(data);
+		return -ENOMEM;
+	}
+
+	HDEV_BUS = HCI_USB;
+
+	data->hdev = hdev;
+
+	SET_HCIDEV_DEV(hdev, &intf->dev);
+
+	hdev->open     = btusb_open;
+	hdev->close    = btusb_close;
+	hdev->flush    = btusb_flush;
+	hdev->send     = btusb_send_frame;
+	hdev->notify   = btusb_notify;
+
+
+	hci_set_drvdata(hdev, data);
+
+	/* Interface numbers are hardcoded in the specification */
+	data->isoc = usb_ifnum_to_if(data->udev, 1);
+
+	if (data->isoc) {
+		err = usb_driver_claim_interface(&btusb_driver,
+						 data->isoc, data);
+		if (err < 0) {
+			hci_free_dev(hdev);
+			kfree(data);
+			return err;
+		}
+	}
+
+	err = hci_register_dev(hdev);
+	if (err < 0) {
+		hci_free_dev(hdev);
+		kfree(data);
+		return err;
+	}
+
+	usb_set_intfdata(intf, data);
+
+	return 0;
+}
+
+static void patch_remove(struct usb_interface *intf)
+{
+	struct dev_data *dev_entry;
+	struct usb_device *udev;
+
+	udev = interface_to_usbdev(intf);
+#if BTUSB_RPM
+	usb_disable_autosuspend(udev);
+#endif
+
+	dev_entry = dev_data_find(intf);
+	if (NULL == dev_entry)
+		return;
+
+	BT_DBG("patch_remove");
+	list_del(&dev_entry->list_node);
+	unregister_pm_notifier(&dev_entry->pm_notifier);
+	kfree(dev_entry);
+}
+
+static void btusb_disconnect(struct usb_interface *intf)
+{
+	struct btusb_data *data = usb_get_intfdata(intf);
+	struct hci_dev *hdev;
+	struct usb_device *udev;
+	udev = interface_to_usbdev(intf);
+
+	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
+		return;
+
+	if (!data)
+		return;
+
+	BT_DBG("btusb_disconnect");
+	/*******************************/
+	patch_remove(intf);
+	/*******************************/
+
+	hdev = data->hdev;
+
+	usb_set_intfdata(data->intf, NULL);
+
+	if (data->isoc)
+		usb_set_intfdata(data->isoc, NULL);
+
+	hci_unregister_dev(hdev);
+
+	if (intf == data->isoc)
+		usb_driver_release_interface(&btusb_driver, data->intf);
+	else if (data->isoc)
+		usb_driver_release_interface(&btusb_driver, data->isoc);
+
+	hci_free_dev(hdev);
+	kfree(data);
+}
+
+#ifdef CONFIG_PM
+static int set_btoff(struct usb_interface *intf)
+{
+	struct dev_data *dev_entry;
+	int ret_val;
+
+	BT_DBG("set_btoff");
+	dev_entry = dev_data_find(intf);
+	if (NULL == dev_entry)
+		return -1;
+
+	init_xdata(&dev_entry->xdata, dev_entry);
+	dev_entry->xdata.cmd_hdr->opcode = cpu_to_le16(BTOFF_OPCODE);
+	dev_entry->xdata.cmd_hdr->plen = 1;
+	dev_entry->xdata.pkt_len = CMD_HDR_LEN + 1;
+	dev_entry->xdata.send_pkt[CMD_HDR_LEN] = 1;
+
+	ret_val = send_hci_cmd(&dev_entry->xdata);
+	if (ret_val < 0)
+		return ret_val;
+
+	ret_val = rcv_hci_evt(&dev_entry->xdata);
+	if (ret_val < 0)
+		return ret_val;
+
+	BT_DBG("set_btoff done");
+	return 0;
+}
+
+static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct btusb_data *data = usb_get_intfdata(intf);
+
+	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
+		return 0;
+
+	/*******************************/
+	BT_DBG("btusb_suspend message.event = 0x%x, data->suspend_count =%d",
+	       message.event, data->suspend_count);
+	if (!test_bit(HCI_RUNNING, &data->hdev->flags)) {
+		BT_DBG("btusb_suspend-----bt is off");
+		set_btoff(data->intf);
+	}
+	/*******************************/
+
+	if (data->suspend_count++)
+		return 0;
+
+	spin_lock_irq(&data->txlock);
+	if (!((message.event & PM_EVENT_AUTO) && data->tx_in_flight)) {
+		set_bit(BTUSB_SUSPENDING, &data->flags);
+		spin_unlock_irq(&data->txlock);
+	} else {
+		spin_unlock_irq(&data->txlock);
+		data->suspend_count--;
+		return -EBUSY;
+	}
+
+	cancel_work_sync(&data->work);
+
+	btusb_stop_traffic(data);
+	mdelay(URB_CANCELING_DELAY_MS);      /*  Added by Realtek */
+	usb_kill_anchored_urbs(&data->tx_anchor);
+
+	return 0;
+}
+
+static void play_deferred(struct btusb_data *data)
+{
+	struct urb *urb;
+	int err;
+
+	while ((urb = usb_get_from_anchor(&data->deferred))) {
+
+		/************************************/
+		usb_anchor_urb(urb, &data->tx_anchor);
+		err = usb_submit_urb(urb, GFP_ATOMIC);
+		if (err < 0) {
+			BT_ERR("play_deferred urb %p submission failed",  urb);
+			kfree(urb->setup_packet);
+			usb_unanchor_urb(urb);
+		} else {
+			usb_mark_last_busy(data->udev);
+		}
+		usb_free_urb(urb);
+		/************************************/
+		data->tx_in_flight++;
+	}
+	mdelay(URB_CANCELING_DELAY_MS);     /*  Added by Realtek */
+	usb_scuttle_anchored_urbs(&data->deferred);
+}
+
+static int btusb_resume(struct usb_interface *intf)
+{
+	struct btusb_data *data = usb_get_intfdata(intf);
+	struct hci_dev *hdev = data->hdev;
+	int err = 0;
+
+	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
+		return 0;
+
+
+	/*******************************/
+	BT_DBG("btusb_resume data->suspend_count =%d", data->suspend_count);
+
+	if (!test_bit(HCI_RUNNING, &hdev->flags)) {
+		BT_DBG("btusb_resume-----bt is off, download patch");
+		download_patch(intf);
+	} else {
+		BT_DBG("btusb_resume,----bt is on");
+	}
+	/*******************************/
+	if (--data->suspend_count)
+		return 0;
+
+	if (test_bit(BTUSB_INTR_RUNNING, &data->flags)) {
+		err = btusb_submit_intr_urb(hdev, GFP_NOIO);
+		if (err < 0) {
+			clear_bit(BTUSB_INTR_RUNNING, &data->flags);
+			goto failed;
+		}
+	}
+
+	if (test_bit(BTUSB_BULK_RUNNING, &data->flags)) {
+		err = btusb_submit_bulk_urb(hdev, GFP_NOIO);
+		if (err < 0) {
+			clear_bit(BTUSB_BULK_RUNNING, &data->flags);
+			goto failed;
+		}
+
+		btusb_submit_bulk_urb(hdev, GFP_NOIO);
+	}
+
+	if (test_bit(BTUSB_ISOC_RUNNING, &data->flags)) {
+		if (btusb_submit_isoc_urb(hdev, GFP_NOIO) < 0)
+			clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
+		else
+			btusb_submit_isoc_urb(hdev, GFP_NOIO);
+	}
+
+	spin_lock_irq(&data->txlock);
+	play_deferred(data);
+	clear_bit(BTUSB_SUSPENDING, &data->flags);
+	spin_unlock_irq(&data->txlock);
+	schedule_work(&data->work);
+
+	return 0;
+
+failed:
+	mdelay(URB_CANCELING_DELAY_MS);      /*  Added by Realtek */
+	usb_scuttle_anchored_urbs(&data->deferred);
+/* done: */
+	spin_lock_irq(&data->txlock);
+	clear_bit(BTUSB_SUSPENDING, &data->flags);
+	spin_unlock_irq(&data->txlock);
+
+	return err;
+}
+#endif
+
+static struct usb_driver btusb_driver = {
+	.name		= "rtk_btusb",
+	.probe		= btusb_probe,
+	.disconnect	= btusb_disconnect,
+#ifdef CONFIG_PM
+	.suspend	= btusb_suspend,
+	.resume		= btusb_resume,
+#endif
+	.id_table	= btusb_table,
+	.supports_autosuspend = 1,
+};
+
+
+module_usb_driver(btusb_driver);
+
+MODULE_AUTHOR("Edward Bian <edward_bian@realsil.com.cn>");
+MODULE_DESCRIPTION("Realtek Bluetooth USB driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("rtl_bt/rtl8723a.bin");
diff --git a/drivers/bluetooth/rtk_btusb.h b/drivers/bluetooth/rtk_btusb.h
new file mode 100644
index 0000000..0c55dd6
--- /dev/null
+++ b/drivers/bluetooth/rtk_btusb.h
@@ -0,0 +1,102 @@ 
+/*
+ *
+ *  Realtek Bluetooth USB driver
+ *
+ *  Copyright (C) 2012-2013  Edward Bian <edward_bian@realsil.com.cn>
+ *
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef RTK_BTUSB_H
+#define RTK_BTUSB_H
+
+#define HDEV_BUS			(hdev->bus)
+#define USB_RPM				1
+
+#define BTUSB_RPM			0	/*1 SS enable; 0 SS disable */
+#define LOAD_CONFIG			0
+#define URB_CANCELING_DELAY_MS		10   /*  Added by Realtek */
+
+#define BTUSB_MAX_ISOC_FRAMES		10
+#define BTUSB_INTR_RUNNING		0
+#define BTUSB_BULK_RUNNING		1
+#define BTUSB_ISOC_RUNNING		2
+#define BTUSB_SUSPENDING		3
+#define BTUSB_DID_ISO_RESUME		4
+
+#define CMD_CMP_EVT			0x0e
+#define PKT_LEN				300
+#define MSG_TO				1000
+#define PATCH_SEG_MAX			252
+#define DATA_END			0x80
+#define DOWNLOAD_OPCODE			0xfc20
+#define BTOFF_OPCODE			0xfc28
+#define CMD_HDR_LEN			sizeof(struct hci_command_hdr)
+#define EVT_HDR_LEN			sizeof(struct hci_event_hdr)
+#define CMD_CMP_LEN			sizeof(struct hci_ev_cmd_complete)
+
+enum rtk_endpoit {
+	CTRL_EP = 0,
+	INTR_EP = 1,
+	BULK_EP = 2,
+	ISOC_EP = 3
+};
+
+struct patch_info {
+	uint16_t	prod_id;
+	uint16_t	lmp_sub;
+	char		*patch_name;
+	char		*config_name;
+	uint8_t		*fw_cache;
+	int		fw_len;
+};
+
+struct xchange_data {
+	struct dev_data	*dev_entry;
+	int pipe_in, pipe_out;
+	uint8_t send_pkt[PKT_LEN];
+	uint8_t rcv_pkt[PKT_LEN];
+	struct hci_command_hdr *cmd_hdr;
+	struct hci_event_hdr *evt_hdr;
+	struct hci_ev_cmd_complete *cmd_cmp;
+	uint8_t *req_para, *rsp_para;
+	uint8_t *fw_data;
+	int pkt_len, fw_len;
+};
+
+struct dev_data {
+	struct list_head	list_node;
+	struct usb_interface	*intf;
+	struct usb_device	*udev;
+	struct notifier_block	pm_notifier;
+	struct patch_info	*patch_entry;
+	struct xchange_data	xdata;
+	struct completion firmware_loading_complete;
+	const struct firmware *fw;
+};
+
+struct download_cp {
+	uint8_t index;
+	uint8_t data[PATCH_SEG_MAX];
+} __packed;
+
+struct download_rp {
+	uint8_t status;
+	uint8_t index;
+} __packed;
+
+#endif