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Re: [RFC/RFT] rtk_btusb: Bluetooth driver for Realtek RTL8723AE combo device

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On Thursday 20 December 2012 20:52:51 Larry Finger wrote:
> This new driver works with the RTL8723AE wireless/BT combo device. The
> corresponding firmware has been submitted to linux-firmware.
> 
> Signed-off-by: Champion Chen <champion_chen@xxxxxxxxxxxxxx>
> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> ---
>  drivers/bluetooth/Kconfig     |   10 +
>  drivers/bluetooth/Makefile    |    1 +
>  drivers/bluetooth/rtk_btusb.c | 1649 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1660 insertions(+)
>  create mode 100644 drivers/bluetooth/rtk_btusb.c
> 
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index e9f203e..efd3766 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -241,4 +241,14 @@ 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..31c128a
> --- /dev/null
> +++ b/drivers/bluetooth/rtk_btusb.c
> @@ -0,0 +1,1650 @@
> +/*
> + *
> + *  Realtek Bluetooth USB driver
> + *
> + *  Copyright (C) 2012-2015  Edward Bian <edward_bian@xxxxxxxxxxxxxx>
> + *
> + *
> + *  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/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +#include <linux/sched.h>
> +#include <linux/errno.h>
> +#include <linux/skbuff.h>
> +#include <linux/usb.h>
> +#include <linux/completion.h>
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +
> +#define VERSION "0.8"
> +
> +static struct usb_driv> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index e9f203e..efd3766 100644

> +static struct usb_driver btusb_driver;
> +#if 1
> +#define RTKBT_DBG(fmt, arg...) pr_info("rtk_btusb: " fmt "\n" , ## arg)

No new debug macros please.










> +
> +static int btusb_open(struct hci_dev *hdev)
> +{
> +	struct btusb_data *data = GET_DRV_DATA(hdev);
> +	int err;
> +
> +	err = usb_autopm_get_interface(data->intf);
> +	if (err < 0)
> +		return err;
> +
> +	data->intf->needs_remote_wakeup = 1;
> +	RTKBT_DBG("%s start pm_usage_cnt(0x%x)", __func__,
> +		  atomic_read(&(data->intf->pm_usage_cnt)));
> +
> +	/*******************************/
> +	if (0 == atomic_read(&hdev->promisc)) {
> +		RTKBT_DBG("btusb_open hdev->promisc == 0");
> +		err = -1;

This makes no sense

> +	}
> +	err = download_patch(data->intf);
> +	if (err < 0)
> +		goto failed;

On every open?

> +	/*******************************/
> +
> +	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);
> +	RTKBT_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);
> +	RTKBT_DBG("%s failed  pm_usage_cnt(0x%x)", __func__,
> +		  atomic_read(&(data->intf->pm_usage_cnt)));
> +	return err;
> +}
> +
> +static void btusb_stop_traffic(struct btusb_data *data)
> +{
> +	mdelay(URB_CANCELING_DELAY_MS);    /*  Added by Realtek */
> +	usb_kill_anchored_urbs(&data->intr_anchor);
> +	usb_kill_anchored_urbs(&data->bulk_anchor);
> +	usb_kill_anchored_urbs(&data->isoc_anchor);
> +}
> +
> +static int btusb_close(struct hci_dev *hdev)
> +{
> +	struct btusb_data *data = GET_DRV_DATA(hdev);
> +	int i, err;
> +
> +	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
> +		return 0;
> +
> +	RTKBT_DBG("btusb_close");
> +	/*******************************/
> +	for (i = 0; i < NUM_REASSEMBLY; i++) {
> +		if (hdev->reassembly[i])	{
> +			kfree_skb(hdev->reassembly[i]);
> +			hdev->reassembly[i] = NULL;
> +			RTKBT_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 */

This makes no sense. Those URBs never went over the wire.

> +	usb_scuttle_anchored_urbs(&data->deferred);
> +	return 0;
> +}
> +
> +static int btusb_flush(struct hci_dev *hdev)
> +{
> +	struct btusb_data *data = GET_DRV_DATA(hdev);
> +
> +	RTKBT_DBG("%s add delay ", __func__);
> +	mdelay(URB_CANCELING_DELAY_MS);     /*  Added by Realtek */
> +	usb_kill_anchored_urbs(&data->tx_anchor);
> +
> +	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 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);
> +
> +	/* 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);
> +	RTKBT_DBG("btusb_probe 1 ========== can_wakeup =%x	 flag2 =%x",
> +		  flag1, flag2);
> +	device_wakeup_disable(&udev->dev);

Why?

> +	flag1 = device_can_wakeup(&udev->dev);
> +	flag2 = device_may_wakeup(&udev->dev);
> +	RTKBT_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 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;
> +
> +	RTKBT_DBG("btusb_disconnect");
> +	/*******************************/
> +	patch_remove(intf);

This is a race. The device is not dead at this time.

> +	/*******************************/
> +
> +	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 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;
> +
> +	/*******************************/
> +	RTKBT_DBG("btusb_suspend message.event = 0x%x, data->suspend_count =%d",
> +		  message.event, data->suspend_count);
> +	if (!test_bit(HCI_RUNNING, &data->hdev->flags)) {
> +		RTKBT_DBG("btusb_suspend-----bt is off");
> +		set_btoff(data->intf);

Why repeat this if the device is already suspended?

> +	}
> +	/*******************************/
> +
> +	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 */

These URBs never went over the wire. Why a delay?

> +	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;
> +
> +
> +	/*******************************/
> +	RTKBT_DBG("btusb_resume data->suspend_count =%d", data->suspend_count);
> +
> +	if (!test_bit(HCI_RUNNING, &hdev->flags)) {
> +		RTKBT_DBG("btusb_resume-----bt is off, download patch");
> +		download_patch(intf);
> +	} else {
> +		RTKBT_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 */

Again, why?

> +	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,
> +};
> +
> +static int __init btusb_init(void)
> +{
> +	RTKBT_DBG("Realtek Bluetooth USB driver ver %s", VERSION);
> +
> +	return usb_register(&btusb_driver);
> +}
> +
> +static void __exit btusb_exit(void)
> +{
> +	usb_deregister(&btusb_driver);
> +}
> +
> +module_init(btusb_init);
> +module_exit(btusb_exit);
> +
> +MODULE_AUTHOR("Edward Bian <edward_bian@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Realtek Bluetooth USB driver ver " VERSION);
> +MODULE_VERSION(VERSION);
> +MODULE_LICENSE("GPL");
> +MODULE_FIRMWARE("rtl_bt/rtl8723a.bin");
> +
> +/*******************************
> +**    Reasil patch code
> +********************************/
> +
> +
> +#include <linux/firmware.h>
> +#include <linux/suspend.h>
> +#include <net/bluetooth/hci.h>
> +
> +
> +#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 TRUE			1
> +#define FALSE			0
> +#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];

Violations of the DMA coherency rules, fails on non-x86

> +	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];

DMA coherency

> +} __packed;
> +
> +struct download_rp {
> +	uint8_t status;
> +	uint8_t index;
> +} __packed;
> +
> +
> +static struct dev_data *dev_data_find(struct usb_interface *intf);
> +static struct patch_info *get_patch_entry(struct usb_device *udev);
> +static int rtkbt_pm_notify(struct notifier_block *notifier, ulong pm_event,
> +			   void *unused);
> +static int load_firmware(struct dev_data *dev_entry, uint8_t **buff);
> +static void init_xdata(struct xchange_data *xdata, struct dev_data *dev_entry);
> +static int check_fw_version(struct xchange_data *xdata);
> +static int get_firmware(struct xchange_data *xdata);
> +static int download_data(struct xchange_data *xdata);
> +static int send_hci_cmd(struct xchange_data *xdata);
> +static int rcv_hci_evt(struct xchange_data *xdata);
> +
> +
> +static struct patch_info patch_table[] = {
> +	{0, 0x1200, "rtl_bt/rtl8723a.bin", "rtk8723_bt_config", NULL, 0}
> +};
> +
> +static LIST_HEAD(dev_data_list);
> +
> +
> +static int patch_add(struct usb_interface *intf)
> +{
> +	struct dev_data	*dev_entry;
> +	struct usb_device *udev;
> +
> +	RTKBT_DBG("patch_add");
> +	dev_entry = dev_data_find(intf);
> +	if (NULL != dev_entry)
> +		return -1;
> +
> +	udev = interface_to_usbdev(intf);
> +#if BTUSB_RPM
> +	RTKBT_DBG("auto suspend is enabled");
> +	usb_enable_autosuspend(udev);
> +	pm_runtime_set_autosuspend_delay(&(udev->dev), 2000);

There is no good reason to overwrite the system values.

> +#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 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;
> +
> +	RTKBT_DBG("patch_remove");
> +	list_del(&dev_entry->list_node);
> +	unregister_pm_notifier(&dev_entry->pm_notifier);
> +	kfree(dev_entry);
> +}
> +
> +static int download_patch(struct usb_interface *intf)
> +{
> +	struct dev_data		*dev_entry;
> +	uint8_t			*fw_buf;
> +	int			ret_val;
> +
> +	RTKBT_DBG("download_patch start");
> +	dev_entry = dev_data_find(intf);
> +	if (NULL == dev_entry) {
> +		ret_val = -1;
> +		RTKBT_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) {
> +		RTKBT_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) {
> +		RTKBT_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:
> +	RTKBT_DBG("Rtk patch end %d", ret_val);
> +	return ret_val;
> +}
> +
> +static int set_btoff(struct usb_interface *intf)
> +{
> +	struct dev_data *dev_entry;
> +	int ret_val;
> +
> +	RTKBT_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;
> +
> +	RTKBT_DBG("set_btoff done");
> +	return 0;
> +}
> +
> +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 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;
> +	RTKBT_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) {
> +			RTKBT_DBG("rtkbt_pm_notify return NOTIFY_BAD");
> +			return NOTIFY_BAD;
> +		}
> +
> +		if (!device_may_wakeup(&udev->dev)) {
> +			dev_entry->intf->needs_binding = 1;
> +			RTKBT_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 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;
> +	RTKBT_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 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);
> +	RTKBT_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 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_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 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;   /*  Added by Realtek */
> +
> +	while (1) {
> +
> +		/*  **************************** Modifed by Realtek (begin) */
> +		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;
> +		}
> +		/*  **************************** Modifed by Realtek (end) */
> +
> +		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;
> +		}
> +	}
> +}
> 
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