// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 *  Generic Bluetooth USB driver
 *
 *  Copyright (C) 2005-2008  Marcel Holtmann <marcel@holtmann.org>
 */

#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/quirks.h>
#include <linux/firmware.h>
#include <linux/iopoll.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/suspend.h>
#include <linux/gpio/consumer.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "btintel.h"
#include "btbcm.h"
#include "btrtl.h"

#define VERSION "0.8"

static bool disable_scofix;
static bool force_scofix;
static bool enable_autosuspend = IS_ENABLED(CONFIG_BT_HCIBTUSB_AUTOSUSPEND);

static bool reset = true;

static struct usb_driver btusb_driver;

#define BTUSB_IGNORE            0x01
#define BTUSB_DIGIANSWER        0x02
#define BTUSB_CSR               0x04
#define BTUSB_SNIFFER           0x08
#define BTUSB_BCM92035          0x10
#define BTUSB_BROKEN_ISOC       0x20
#define BTUSB_WRONG_SCO_MTU     0x40
#define BTUSB_ATH3012           0x80
#define BTUSB_INTEL_COMBINED    0x100
#define BTUSB_INTEL_BOOT        0x200
#define BTUSB_BCM_PATCHRAM      0x400
#define BTUSB_MARVELL           0x800
#define BTUSB_SWAVE             0x1000
#define BTUSB_AMP               0x4000
#define BTUSB_QCA_ROME          0x8000
#define BTUSB_BCM_APPLE         0x10000
#define BTUSB_REALTEK           0x20000
#define BTUSB_BCM2045           0x40000
#define BTUSB_IFNUM_2           0x80000
#define BTUSB_CW6622            0x100000
#define BTUSB_MEDIATEK          0x200000
#define BTUSB_WIDEBAND_SPEECH   0x400000
#define BTUSB_VALID_LE_STATES   0x800000
#define BTUSB_QCA_WCN6855       0x1000000
#define BTUSB_INTEL_BROKEN_INITIAL_NCMD 0x4000000

static const struct usb_device_id btusb_table[] = {
        /* Generic Bluetooth USB device */
        { USB_DEVICE_INFO(0xe0, 0x01, 0x01) },

        /* Generic Bluetooth AMP device */
        { USB_DEVICE_INFO(0xe0, 0x01, 0x04), .driver_info = BTUSB_AMP },

        /* Generic Bluetooth USB interface */
        { USB_INTERFACE_INFO(0xe0, 0x01, 0x01) },

        /* Apple-specific (Broadcom) devices */
        { USB_VENDOR_AND_INTERFACE_INFO(0x05ac, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_APPLE | BTUSB_IFNUM_2 },

        /* MediaTek MT76x0E */
        { USB_DEVICE(0x0e8d, 0x763f) },

        /* Broadcom SoftSailing reporting vendor specific */
        { USB_DEVICE(0x0a5c, 0x21e1) },

        /* Apple MacBookPro 7,1 */
        { USB_DEVICE(0x05ac, 0x8213) },

        /* Apple iMac11,1 */
        { USB_DEVICE(0x05ac, 0x8215) },

        /* Apple MacBookPro6,2 */
        { USB_DEVICE(0x05ac, 0x8218) },

        /* Apple MacBookAir3,1, MacBookAir3,2 */
        { USB_DEVICE(0x05ac, 0x821b) },

        /* Apple MacBookAir4,1 */
        { USB_DEVICE(0x05ac, 0x821f) },

        /* Apple MacBookPro8,2 */
        { USB_DEVICE(0x05ac, 0x821a) },

        /* Apple MacMini5,1 */
        { USB_DEVICE(0x05ac, 0x8281) },

        /* AVM BlueFRITZ! USB v2.0 */
        { USB_DEVICE(0x057c, 0x3800), .driver_info = BTUSB_SWAVE },

        /* Bluetooth Ultraport Module from IBM */
        { USB_DEVICE(0x04bf, 0x030a) },

        /* ALPS Modules with non-standard id */
        { USB_DEVICE(0x044e, 0x3001) },
        { USB_DEVICE(0x044e, 0x3002) },

        /* Ericsson with non-standard id */
        { USB_DEVICE(0x0bdb, 0x1002) },

        /* Canyon CN-BTU1 with HID interfaces */
        { USB_DEVICE(0x0c10, 0x0000) },

        /* Broadcom BCM20702B0 (Dynex/Insignia) */
        { USB_DEVICE(0x19ff, 0x0239), .driver_info = BTUSB_BCM_PATCHRAM },

        /* Broadcom BCM43142A0 (Foxconn/Lenovo) */
        { USB_VENDOR_AND_INTERFACE_INFO(0x105b, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Broadcom BCM920703 (HTC Vive) */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0bb4, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Foxconn - Hon Hai */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0489, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Lite-On Technology - Broadcom based */
        { USB_VENDOR_AND_INTERFACE_INFO(0x04ca, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Broadcom devices with vendor specific id */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0a5c, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* ASUSTek Computer - Broadcom based */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0b05, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Belkin F8065bf - Broadcom based */
        { USB_VENDOR_AND_INTERFACE_INFO(0x050d, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* IMC Networks - Broadcom based */
        { USB_VENDOR_AND_INTERFACE_INFO(0x13d3, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Dell Computer - Broadcom based  */
        { USB_VENDOR_AND_INTERFACE_INFO(0x413c, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Toshiba Corp - Broadcom based */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0930, 0xff, 0x01, 0x01),
          .driver_info = BTUSB_BCM_PATCHRAM },

        /* Intel Bluetooth USB Bootloader (RAM module) */
        { USB_DEVICE(0x8087, 0x0a5a),
          .driver_info = BTUSB_INTEL_BOOT | BTUSB_BROKEN_ISOC },

        { }     /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, btusb_table);

static const struct usb_device_id blacklist_table[] = {
        /* CSR BlueCore devices */
        { USB_DEVICE(0x0a12, 0x0001), .driver_info = BTUSB_CSR },

        /* Broadcom BCM2033 without firmware */
        { USB_DEVICE(0x0a5c, 0x2033), .driver_info = BTUSB_IGNORE },

        /* Broadcom BCM2045 devices */
        { USB_DEVICE(0x0a5c, 0x2045), .driver_info = BTUSB_BCM2045 },

        /* Atheros 3011 with sflash firmware */
        { USB_DEVICE(0x0489, 0xe027), .driver_info = BTUSB_IGNORE },
        { USB_DEVICE(0x0489, 0xe03d), .driver_info = BTUSB_IGNORE },
        { USB_DEVICE(0x04f2, 0xaff1), .driver_info = BTUSB_IGNORE },
        { USB_DEVICE(0x0930, 0x0215), .driver_info = BTUSB_IGNORE },
        { USB_DEVICE(0x0cf3, 0x3002), .driver_info = BTUSB_IGNORE },
        { USB_DEVICE(0x0cf3, 0xe019), .driver_info = BTUSB_IGNORE },
        { USB_DEVICE(0x13d3, 0x3304), .driver_info = BTUSB_IGNORE },

        /* Atheros AR9285 Malbec with sflash firmware */
        { USB_DEVICE(0x03f0, 0x311d), .driver_info = BTUSB_IGNORE },

        /* Atheros 3012 with sflash firmware */
        { USB_DEVICE(0x0489, 0xe04d), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe04e), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe056), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe057), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe05f), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe076), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe078), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe095), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04c5, 0x1330), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3004), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3005), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3006), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3007), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3008), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x300b), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x300d), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x300f), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3010), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3014), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x04ca, 0x3018), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0930, 0x0219), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0930, 0x021c), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0930, 0x0220), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0930, 0x0227), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0b05, 0x17d0), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x0036), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x3004), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x3008), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x311d), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x311e), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x311f), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x3121), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x817a), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0x817b), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0xe003), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0xe004), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0xe005), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0cf3, 0xe006), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3362), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3375), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3393), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3395), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3402), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3408), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3423), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3432), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3472), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3474), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3487), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x13d3, 0x3490), .driver_info = BTUSB_ATH3012 },

        /* Atheros AR5BBU12 with sflash firmware */
        { USB_DEVICE(0x0489, 0xe02c), .driver_info = BTUSB_IGNORE },

        /* Atheros AR5BBU12 with sflash firmware */
        { USB_DEVICE(0x0489, 0xe036), .driver_info = BTUSB_ATH3012 },
        { USB_DEVICE(0x0489, 0xe03c), .driver_info = BTUSB_ATH3012 },

        /* QCA ROME chipset */
        { USB_DEVICE(0x0cf3, 0x535b), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe007), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe009), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe010), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe300), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe301), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe360), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cf3, 0xe500), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0489, 0xe092), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0489, 0xe09f), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0489, 0xe0a2), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04ca, 0x3011), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04ca, 0x3015), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04ca, 0x3016), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04ca, 0x301a), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04ca, 0x3021), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3491), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3496), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3501), .driver_info = BTUSB_QCA_ROME |
                                                     BTUSB_WIDEBAND_SPEECH },

        /* QCA WCN6855 chipset */
        { USB_DEVICE(0x0cf3, 0xe600), .driver_info = BTUSB_QCA_WCN6855 |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },

        /* Broadcom BCM2035 */
        { USB_DEVICE(0x0a5c, 0x2009), .driver_info = BTUSB_BCM92035 },
        { USB_DEVICE(0x0a5c, 0x200a), .driver_info = BTUSB_WRONG_SCO_MTU },
        { USB_DEVICE(0x0a5c, 0x2035), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* Broadcom BCM2045 */
        { USB_DEVICE(0x0a5c, 0x2039), .driver_info = BTUSB_WRONG_SCO_MTU },
        { USB_DEVICE(0x0a5c, 0x2101), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* IBM/Lenovo ThinkPad with Broadcom chip */
        { USB_DEVICE(0x0a5c, 0x201e), .driver_info = BTUSB_WRONG_SCO_MTU },
        { USB_DEVICE(0x0a5c, 0x2110), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* HP laptop with Broadcom chip */
        { USB_DEVICE(0x03f0, 0x171d), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* Dell laptop with Broadcom chip */
        { USB_DEVICE(0x413c, 0x8126), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* Dell Wireless 370 and 410 devices */
        { USB_DEVICE(0x413c, 0x8152), .driver_info = BTUSB_WRONG_SCO_MTU },
        { USB_DEVICE(0x413c, 0x8156), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* Belkin F8T012 and F8T013 devices */
        { USB_DEVICE(0x050d, 0x0012), .driver_info = BTUSB_WRONG_SCO_MTU },
        { USB_DEVICE(0x050d, 0x0013), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* Asus WL-BTD202 device */
        { USB_DEVICE(0x0b05, 0x1715), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* Kensington Bluetooth USB adapter */
        { USB_DEVICE(0x047d, 0x105e), .driver_info = BTUSB_WRONG_SCO_MTU },

        /* RTX Telecom based adapters with buggy SCO support */
        { USB_DEVICE(0x0400, 0x0807), .driver_info = BTUSB_BROKEN_ISOC },
        { USB_DEVICE(0x0400, 0x080a), .driver_info = BTUSB_BROKEN_ISOC },

        /* CONWISE Technology based adapters with buggy SCO support */
        { USB_DEVICE(0x0e5e, 0x6622),
          .driver_info = BTUSB_BROKEN_ISOC | BTUSB_CW6622},

        /* Roper Class 1 Bluetooth Dongle (Silicon Wave based) */
        { USB_DEVICE(0x1310, 0x0001), .driver_info = BTUSB_SWAVE },

        /* Digianswer devices */
        { USB_DEVICE(0x08fd, 0x0001), .driver_info = BTUSB_DIGIANSWER },
        { USB_DEVICE(0x08fd, 0x0002), .driver_info = BTUSB_IGNORE },

        /* CSR BlueCore Bluetooth Sniffer */
        { USB_DEVICE(0x0a12, 0x0002),
          .driver_info = BTUSB_SNIFFER | BTUSB_BROKEN_ISOC },

        /* Frontline ComProbe Bluetooth Sniffer */
        { USB_DEVICE(0x16d3, 0x0002),
          .driver_info = BTUSB_SNIFFER | BTUSB_BROKEN_ISOC },

        /* Marvell Bluetooth devices */
        { USB_DEVICE(0x1286, 0x2044), .driver_info = BTUSB_MARVELL },
        { USB_DEVICE(0x1286, 0x2046), .driver_info = BTUSB_MARVELL },
        { USB_DEVICE(0x1286, 0x204e), .driver_info = BTUSB_MARVELL },

        /* Intel Bluetooth devices */
        { USB_DEVICE(0x8087, 0x0025), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0026), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0029), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0032), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0033), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x07da), .driver_info = BTUSB_CSR },
        { USB_DEVICE(0x8087, 0x07dc), .driver_info = BTUSB_INTEL_COMBINED |
                                                     BTUSB_INTEL_BROKEN_INITIAL_NCMD },
        { USB_DEVICE(0x8087, 0x0a2a), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0a2b), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0aa7), .driver_info = BTUSB_INTEL_COMBINED },
        { USB_DEVICE(0x8087, 0x0aaa), .driver_info = BTUSB_INTEL_COMBINED },

        /* Other Intel Bluetooth devices */
        { USB_VENDOR_AND_INTERFACE_INFO(0x8087, 0xe0, 0x01, 0x01),
          .driver_info = BTUSB_IGNORE },

        /* Realtek 8822CE Bluetooth devices */
        { USB_DEVICE(0x0bda, 0xb00c), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0bda, 0xc822), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },

        /* Realtek 8852AE Bluetooth devices */
        { USB_DEVICE(0x0bda, 0xc852), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0bda, 0x4852), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04c5, 0x165c), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04ca, 0x4006), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },

        /* Realtek Bluetooth devices */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0bda, 0xe0, 0x01, 0x01),
          .driver_info = BTUSB_REALTEK },

        /* MediaTek Bluetooth devices */
        { USB_VENDOR_AND_INTERFACE_INFO(0x0e8d, 0xe0, 0x01, 0x01),
          .driver_info = BTUSB_MEDIATEK |
                         BTUSB_WIDEBAND_SPEECH |
                         BTUSB_VALID_LE_STATES },

        /* Additional MediaTek MT7615E Bluetooth devices */
        { USB_DEVICE(0x13d3, 0x3560), .driver_info = BTUSB_MEDIATEK},

        /* Additional MediaTek MT7668 Bluetooth devices */
        { USB_DEVICE(0x043e, 0x3109), .driver_info = BTUSB_MEDIATEK |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },

        /* Additional MediaTek MT7921 Bluetooth devices */
        { USB_DEVICE(0x04ca, 0x3802), .driver_info = BTUSB_MEDIATEK |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },
        { USB_DEVICE(0x13d3, 0x3563), .driver_info = BTUSB_MEDIATEK |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },
        { USB_DEVICE(0x13d3, 0x3564), .driver_info = BTUSB_MEDIATEK |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },
        { USB_DEVICE(0x0489, 0xe0cd), .driver_info = BTUSB_MEDIATEK |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },

        /* Additional Realtek 8723AE Bluetooth devices */
        { USB_DEVICE(0x0930, 0x021d), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3394), .driver_info = BTUSB_REALTEK },

        /* Additional Realtek 8723BE Bluetooth devices */
        { USB_DEVICE(0x0489, 0xe085), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x0489, 0xe08b), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3410), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3416), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3459), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3494), .driver_info = BTUSB_REALTEK },

        /* Additional Realtek 8723BU Bluetooth devices */
        { USB_DEVICE(0x7392, 0xa611), .driver_info = BTUSB_REALTEK },

        /* Additional Realtek 8723DE Bluetooth devices */
        { USB_DEVICE(0x0bda, 0xb009), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x2ff8, 0xb011), .driver_info = BTUSB_REALTEK },

        /* Additional Realtek 8761B Bluetooth devices */
        { USB_DEVICE(0x2357, 0x0604), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },

        /* Additional Realtek 8761BU Bluetooth devices */
        { USB_DEVICE(0x0b05, 0x190e), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },

        /* Additional Realtek 8821AE Bluetooth devices */
        { USB_DEVICE(0x0b05, 0x17dc), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3414), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3458), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3461), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x13d3, 0x3462), .driver_info = BTUSB_REALTEK },

        /* Additional Realtek 8822BE Bluetooth devices */
        { USB_DEVICE(0x13d3, 0x3526), .driver_info = BTUSB_REALTEK },
        { USB_DEVICE(0x0b05, 0x185c), .driver_info = BTUSB_REALTEK },

        /* Additional Realtek 8822CE Bluetooth devices */
        { USB_DEVICE(0x04ca, 0x4005), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x04c5, 0x161f), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0b05, 0x18ef), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3548), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3549), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3553), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x13d3, 0x3555), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x2ff8, 0x3051), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x1358, 0xc123), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0bda, 0xc123), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x0cb5, 0xc547), .driver_info = BTUSB_REALTEK |
                                                     BTUSB_WIDEBAND_SPEECH },

        /* Silicon Wave based devices */
        { USB_DEVICE(0x0c10, 0x0000), .driver_info = BTUSB_SWAVE },

        { }     /* Terminating entry */
};

/* The Bluetooth USB module build into some devices needs to be reset on resume,
 * this is a problem with the platform (likely shutting off all power) not with
 * the module itself. So we use a DMI list to match known broken platforms.
 */
static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
        {
                /* Dell OptiPlex 3060 (QCA ROME device 0cf3:e007) */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 3060"),
                },
        },
        {
                /* Dell XPS 9360 (QCA ROME device 0cf3:e300) */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
                },
        },
        {
                /* Dell Inspiron 5565 (QCA ROME device 0cf3:e009) */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5565"),
                },
        },
        {}
};

#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 BTUSB_BOOTLOADER        5
#define BTUSB_DOWNLOADING       6
#define BTUSB_FIRMWARE_LOADED   7
#define BTUSB_FIRMWARE_FAILED   8
#define BTUSB_BOOTING           9
#define BTUSB_DIAG_RUNNING      10
#define BTUSB_OOB_WAKE_ENABLED  11
#define BTUSB_HW_RESET_ACTIVE   12
#define BTUSB_TX_WAIT_VND_EVT   13
#define BTUSB_WAKEUP_AUTOSUSPEND        14
#define BTUSB_USE_ALT3_FOR_WBS  15

struct btusb_data {
        struct hci_dev       *hdev;
        struct usb_device    *udev;
        struct usb_interface *intf;
        struct usb_interface *isoc;
        struct usb_interface *diag;
        unsigned isoc_ifnum;

        unsigned long flags;

        struct work_struct work;
        struct work_struct waker;

        struct usb_anchor deferred;
        struct usb_anchor tx_anchor;
        int tx_in_flight;
        spinlock_t txlock;

        struct usb_anchor intr_anchor;
        struct usb_anchor bulk_anchor;
        struct usb_anchor isoc_anchor;
        struct usb_anchor diag_anchor;
        struct usb_anchor ctrl_anchor;
        spinlock_t rxlock;

        struct sk_buff *evt_skb;
        struct sk_buff *acl_skb;
        struct sk_buff *sco_skb;

        struct usb_endpoint_descriptor *intr_ep;
        struct usb_endpoint_descriptor *bulk_tx_ep;
        struct usb_endpoint_descriptor *bulk_rx_ep;
        struct usb_endpoint_descriptor *isoc_tx_ep;
        struct usb_endpoint_descriptor *isoc_rx_ep;
        struct usb_endpoint_descriptor *diag_tx_ep;
        struct usb_endpoint_descriptor *diag_rx_ep;

        struct gpio_desc *reset_gpio;

        __u8 cmdreq_type;
        __u8 cmdreq;

        unsigned int sco_num;
        unsigned int air_mode;
        bool usb_alt6_packet_flow;
        int isoc_altsetting;
        int suspend_count;

        int (*recv_event)(struct hci_dev *hdev, struct sk_buff *skb);
        int (*recv_acl)(struct hci_dev *hdev, struct sk_buff *skb);
        int (*recv_bulk)(struct btusb_data *data, void *buffer, int count);

        int (*setup_on_usb)(struct hci_dev *hdev);

        int oob_wake_irq;   /* irq for out-of-band wake-on-bt */
        unsigned cmd_timeout_cnt;
};

static void btusb_intel_cmd_timeout(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct gpio_desc *reset_gpio = data->reset_gpio;

        if (++data->cmd_timeout_cnt < 5)
                return;

        if (!reset_gpio) {
                bt_dev_err(hdev, "No way to reset. Ignoring and continuing");
                return;
        }

        /*
         * Toggle the hard reset line if the platform provides one. The reset
         * is going to yank the device off the USB and then replug. So doing
         * once is enough. The cleanup is handled correctly on the way out
         * (standard USB disconnect), and the new device is detected cleanly
         * and bound to the driver again like it should be.
         */
        if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
                bt_dev_err(hdev, "last reset failed? Not resetting again");
                return;
        }

        bt_dev_err(hdev, "Initiating HW reset via gpio");
        gpiod_set_value_cansleep(reset_gpio, 1);
        msleep(100);
        gpiod_set_value_cansleep(reset_gpio, 0);
}

static void btusb_rtl_cmd_timeout(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct gpio_desc *reset_gpio = data->reset_gpio;

        if (++data->cmd_timeout_cnt < 5)
                return;

        if (!reset_gpio) {
                bt_dev_err(hdev, "No gpio to reset Realtek device, ignoring");
                return;
        }

        /* Toggle the hard reset line. The Realtek device is going to
         * yank itself off the USB and then replug. The cleanup is handled
         * correctly on the way out (standard USB disconnect), and the new
         * device is detected cleanly and bound to the driver again like
         * it should be.
         */
        if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
                bt_dev_err(hdev, "last reset failed? Not resetting again");
                return;
        }

        bt_dev_err(hdev, "Reset Realtek device via gpio");
        gpiod_set_value_cansleep(reset_gpio, 1);
        msleep(200);
        gpiod_set_value_cansleep(reset_gpio, 0);
}

static void btusb_qca_cmd_timeout(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct gpio_desc *reset_gpio = data->reset_gpio;
        int err;

        if (++data->cmd_timeout_cnt < 5)
                return;

        if (reset_gpio) {
                bt_dev_err(hdev, "Reset qca device via bt_en gpio");

                /* Toggle the hard reset line. The qca bt device is going to
                 * yank itself off the USB and then replug. The cleanup is handled
                 * correctly on the way out (standard USB disconnect), and the new
                 * device is detected cleanly and bound to the driver again like
                 * it should be.
                 */
                if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
                        bt_dev_err(hdev, "last reset failed? Not resetting again");
                        return;
                }

                gpiod_set_value_cansleep(reset_gpio, 0);
                msleep(200);
                gpiod_set_value_cansleep(reset_gpio, 1);

                return;
        }

        bt_dev_err(hdev, "Multiple cmd timeouts seen. Resetting usb device.");
        /* This is not an unbalanced PM reference since the device will reset */
        err = usb_autopm_get_interface(data->intf);
        if (!err)
                usb_queue_reset_device(data->intf);
        else
                bt_dev_err(hdev, "Failed usb_autopm_get_interface with %d", err);
}

static inline void btusb_free_frags(struct btusb_data *data)
{
        unsigned long flags;

        spin_lock_irqsave(&data->rxlock, flags);

        kfree_skb(data->evt_skb);
        data->evt_skb = NULL;

        kfree_skb(data->acl_skb);
        data->acl_skb = NULL;

        kfree_skb(data->sco_skb);
        data->sco_skb = NULL;

        spin_unlock_irqrestore(&data->rxlock, flags);
}

static int btusb_recv_intr(struct btusb_data *data, void *buffer, int count)
{
        struct sk_buff *skb;
        unsigned long flags;
        int err = 0;

        spin_lock_irqsave(&data->rxlock, flags);
        skb = data->evt_skb;

        while (count) {
                int len;

                if (!skb) {
                        skb = bt_skb_alloc(HCI_MAX_EVENT_SIZE, GFP_ATOMIC);
                        if (!skb) {
                                err = -ENOMEM;
                                break;
                        }

                        hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
                        hci_skb_expect(skb) = HCI_EVENT_HDR_SIZE;
                }

                len = min_t(uint, hci_skb_expect(skb), count);
                skb_put_data(skb, buffer, len);

                count -= len;
                buffer += len;
                hci_skb_expect(skb) -= len;

                if (skb->len == HCI_EVENT_HDR_SIZE) {
                        /* Complete event header */
                        hci_skb_expect(skb) = hci_event_hdr(skb)->plen;

                        if (skb_tailroom(skb) < hci_skb_expect(skb)) {
                                kfree_skb(skb);
                                skb = NULL;

                                err = -EILSEQ;
                                break;
                        }
                }

                if (!hci_skb_expect(skb)) {
                        /* Complete frame */
                        data->recv_event(data->hdev, skb);
                        skb = NULL;
                }
        }

        data->evt_skb = skb;
        spin_unlock_irqrestore(&data->rxlock, flags);

        return err;
}

static int btusb_recv_bulk(struct btusb_data *data, void *buffer, int count)
{
        struct sk_buff *skb;
        unsigned long flags;
        int err = 0;

        spin_lock_irqsave(&data->rxlock, flags);
        skb = data->acl_skb;

        while (count) {
                int len;

                if (!skb) {
                        skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
                        if (!skb) {
                                err = -ENOMEM;
                                break;
                        }

                        hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
                        hci_skb_expect(skb) = HCI_ACL_HDR_SIZE;
                }

                len = min_t(uint, hci_skb_expect(skb), count);
                skb_put_data(skb, buffer, len);

                count -= len;
                buffer += len;
                hci_skb_expect(skb) -= len;

                if (skb->len == HCI_ACL_HDR_SIZE) {
                        __le16 dlen = hci_acl_hdr(skb)->dlen;

                        /* Complete ACL header */
                        hci_skb_expect(skb) = __le16_to_cpu(dlen);

                        if (skb_tailroom(skb) < hci_skb_expect(skb)) {
                                kfree_skb(skb);
                                skb = NULL;

                                err = -EILSEQ;
                                break;
                        }
                }

                if (!hci_skb_expect(skb)) {
                        /* Complete frame */
                        data->recv_acl(data->hdev, skb);
                        skb = NULL;
                }
        }

        data->acl_skb = skb;
        spin_unlock_irqrestore(&data->rxlock, flags);

        return err;
}

static int btusb_recv_isoc(struct btusb_data *data, void *buffer, int count)
{
        struct sk_buff *skb;
        unsigned long flags;
        int err = 0;

        spin_lock_irqsave(&data->rxlock, flags);
        skb = data->sco_skb;

        while (count) {
                int len;

                if (!skb) {
                        skb = bt_skb_alloc(HCI_MAX_SCO_SIZE, GFP_ATOMIC);
                        if (!skb) {
                                err = -ENOMEM;
                                break;
                        }

                        hci_skb_pkt_type(skb) = HCI_SCODATA_PKT;
                        hci_skb_expect(skb) = HCI_SCO_HDR_SIZE;
                }

                len = min_t(uint, hci_skb_expect(skb), count);
                skb_put_data(skb, buffer, len);

                count -= len;
                buffer += len;
                hci_skb_expect(skb) -= len;

                if (skb->len == HCI_SCO_HDR_SIZE) {
                        /* Complete SCO header */
                        hci_skb_expect(skb) = hci_sco_hdr(skb)->dlen;

                        if (skb_tailroom(skb) < hci_skb_expect(skb)) {
                                kfree_skb(skb);
                                skb = NULL;

                                err = -EILSEQ;
                                break;
                        }
                }

                if (!hci_skb_expect(skb)) {
                        /* Complete frame */
                        hci_recv_frame(data->hdev, skb);
                        skb = NULL;
                }
        }

        data->sco_skb = skb;
        spin_unlock_irqrestore(&data->rxlock, flags);

        return err;
}

static void btusb_intr_complete(struct urb *urb)
{
        struct hci_dev *hdev = urb->context;
        struct btusb_data *data = hci_get_drvdata(hdev);
        int err;

        BT_DBG("%s urb %p status %d count %d", hdev->name, urb, urb->status,
               urb->actual_length);

        if (!test_bit(HCI_RUNNING, &hdev->flags))
                return;

        if (urb->status == 0) {
                hdev->stat.byte_rx += urb->actual_length;

                if (btusb_recv_intr(data, urb->transfer_buffer,
                                    urb->actual_length) < 0) {
                        bt_dev_err(hdev, "corrupted event packet");
                        hdev->stat.err_rx++;
                }
        } else if (urb->status == -ENOENT) {
                /* Avoid suspend failed when usb_kill_urb */
                return;
        }

        if (!test_bit(BTUSB_INTR_RUNNING, &data->flags))
                return;

        usb_mark_last_busy(data->udev);
        usb_anchor_urb(urb, &data->intr_anchor);

        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err < 0) {
                /* -EPERM: urb is being killed;
                 * -ENODEV: device got disconnected
                 */
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p failed to resubmit (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }
}

static int btusb_submit_intr_urb(struct hci_dev *hdev, gfp_t mem_flags)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;
        unsigned char *buf;
        unsigned int pipe;
        int err, size;

        BT_DBG("%s", hdev->name);

        if (!data->intr_ep)
                return -ENODEV;

        urb = usb_alloc_urb(0, mem_flags);
        if (!urb)
                return -ENOMEM;

        size = le16_to_cpu(data->intr_ep->wMaxPacketSize);

        buf = kmalloc(size, mem_flags);
        if (!buf) {
                usb_free_urb(urb);
                return -ENOMEM;
        }

        pipe = usb_rcvintpipe(data->udev, data->intr_ep->bEndpointAddress);

        usb_fill_int_urb(urb, data->udev, pipe, buf, size,
                         btusb_intr_complete, hdev, data->intr_ep->bInterval);

        urb->transfer_flags |= URB_FREE_BUFFER;

        usb_anchor_urb(urb, &data->intr_anchor);

        err = usb_submit_urb(urb, mem_flags);
        if (err < 0) {
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }

        usb_free_urb(urb);

        return err;
}

static void btusb_bulk_complete(struct urb *urb)
{
        struct hci_dev *hdev = urb->context;
        struct btusb_data *data = hci_get_drvdata(hdev);
        int err;

        BT_DBG("%s urb %p status %d count %d", hdev->name, urb, urb->status,
               urb->actual_length);

        if (!test_bit(HCI_RUNNING, &hdev->flags))
                return;

        if (urb->status == 0) {
                hdev->stat.byte_rx += urb->actual_length;

                if (data->recv_bulk(data, urb->transfer_buffer,
                                    urb->actual_length) < 0) {
                        bt_dev_err(hdev, "corrupted ACL packet");
                        hdev->stat.err_rx++;
                }
        } else if (urb->status == -ENOENT) {
                /* Avoid suspend failed when usb_kill_urb */
                return;

        }

        if (!test_bit(BTUSB_BULK_RUNNING, &data->flags))
                return;

        usb_anchor_urb(urb, &data->bulk_anchor);
        usb_mark_last_busy(data->udev);

        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err < 0) {
                /* -EPERM: urb is being killed;
                 * -ENODEV: device got disconnected
                 */
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p failed to resubmit (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }
}

static int btusb_submit_bulk_urb(struct hci_dev *hdev, gfp_t mem_flags)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;
        unsigned char *buf;
        unsigned int pipe;
        int err, size = HCI_MAX_FRAME_SIZE;

        BT_DBG("%s", hdev->name);

        if (!data->bulk_rx_ep)
                return -ENODEV;

        urb = usb_alloc_urb(0, mem_flags);
        if (!urb)
                return -ENOMEM;

        buf = kmalloc(size, mem_flags);
        if (!buf) {
                usb_free_urb(urb);
                return -ENOMEM;
        }

        pipe = usb_rcvbulkpipe(data->udev, data->bulk_rx_ep->bEndpointAddress);

        usb_fill_bulk_urb(urb, data->udev, pipe, buf, size,
                          btusb_bulk_complete, hdev);

        urb->transfer_flags |= URB_FREE_BUFFER;

        usb_mark_last_busy(data->udev);
        usb_anchor_urb(urb, &data->bulk_anchor);

        err = usb_submit_urb(urb, mem_flags);
        if (err < 0) {
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }

        usb_free_urb(urb);

        return err;
}

static void btusb_isoc_complete(struct urb *urb)
{
        struct hci_dev *hdev = urb->context;
        struct btusb_data *data = hci_get_drvdata(hdev);
        int i, err;

        BT_DBG("%s urb %p status %d count %d", hdev->name, urb, urb->status,
               urb->actual_length);

        if (!test_bit(HCI_RUNNING, &hdev->flags))
                return;

        if (urb->status == 0) {
                for (i = 0; i < urb->number_of_packets; i++) {
                        unsigned int offset = urb->iso_frame_desc[i].offset;
                        unsigned int length = urb->iso_frame_desc[i].actual_length;

                        if (urb->iso_frame_desc[i].status)
                                continue;

                        hdev->stat.byte_rx += length;

                        if (btusb_recv_isoc(data, urb->transfer_buffer + offset,
                                            length) < 0) {
                                bt_dev_err(hdev, "corrupted SCO packet");
                                hdev->stat.err_rx++;
                        }
                }
        } else if (urb->status == -ENOENT) {
                /* Avoid suspend failed when usb_kill_urb */
                return;
        }

        if (!test_bit(BTUSB_ISOC_RUNNING, &data->flags))
                return;

        usb_anchor_urb(urb, &data->isoc_anchor);

        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err < 0) {
                /* -EPERM: urb is being killed;
                 * -ENODEV: device got disconnected
                 */
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p failed to resubmit (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }
}

static inline void __fill_isoc_descriptor_msbc(struct urb *urb, int len,
                                               int mtu, struct btusb_data *data)
{
        int i, offset = 0;
        unsigned int interval;

        BT_DBG("len %d mtu %d", len, mtu);

        /* For mSBC ALT 6 setting the host will send the packet at continuous
         * flow. As per core spec 5, vol 4, part B, table 2.1. For ALT setting
         * 6 the HCI PACKET INTERVAL should be 7.5ms for every usb packets.
         * To maintain the rate we send 63bytes of usb packets alternatively for
         * 7ms and 8ms to maintain the rate as 7.5ms.
         */
        if (data->usb_alt6_packet_flow) {
                interval = 7;
                data->usb_alt6_packet_flow = false;
        } else {
                interval = 6;
                data->usb_alt6_packet_flow = true;
        }

        for (i = 0; i < interval; i++) {
                urb->iso_frame_desc[i].offset = offset;
                urb->iso_frame_desc[i].length = offset;
        }

        if (len && i < BTUSB_MAX_ISOC_FRAMES) {
                urb->iso_frame_desc[i].offset = offset;
                urb->iso_frame_desc[i].length = len;
                i++;
        }

        urb->number_of_packets = i;
}

static inline void __fill_isoc_descriptor(struct urb *urb, int len, int mtu)
{
        int i, offset = 0;

        BT_DBG("len %d mtu %d", len, mtu);

        for (i = 0; i < BTUSB_MAX_ISOC_FRAMES && len >= mtu;
                                        i++, offset += mtu, len -= mtu) {
                urb->iso_frame_desc[i].offset = offset;
                urb->iso_frame_desc[i].length = mtu;
        }

        if (len && i < BTUSB_MAX_ISOC_FRAMES) {
                urb->iso_frame_desc[i].offset = offset;
                urb->iso_frame_desc[i].length = len;
                i++;
        }

        urb->number_of_packets = i;
}

static int btusb_submit_isoc_urb(struct hci_dev *hdev, gfp_t mem_flags)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;
        unsigned char *buf;
        unsigned int pipe;
        int err, size;

        BT_DBG("%s", hdev->name);

        if (!data->isoc_rx_ep)
                return -ENODEV;

        urb = usb_alloc_urb(BTUSB_MAX_ISOC_FRAMES, mem_flags);
        if (!urb)
                return -ENOMEM;

        size = le16_to_cpu(data->isoc_rx_ep->wMaxPacketSize) *
                                                BTUSB_MAX_ISOC_FRAMES;

        buf = kmalloc(size, mem_flags);
        if (!buf) {
                usb_free_urb(urb);
                return -ENOMEM;
        }

        pipe = usb_rcvisocpipe(data->udev, data->isoc_rx_ep->bEndpointAddress);

        usb_fill_int_urb(urb, data->udev, pipe, buf, size, btusb_isoc_complete,
                         hdev, data->isoc_rx_ep->bInterval);

        urb->transfer_flags = URB_FREE_BUFFER | URB_ISO_ASAP;

        __fill_isoc_descriptor(urb, size,
                               le16_to_cpu(data->isoc_rx_ep->wMaxPacketSize));

        usb_anchor_urb(urb, &data->isoc_anchor);

        err = usb_submit_urb(urb, mem_flags);
        if (err < 0) {
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }

        usb_free_urb(urb);

        return err;
}

static void btusb_diag_complete(struct urb *urb)
{
        struct hci_dev *hdev = urb->context;
        struct btusb_data *data = hci_get_drvdata(hdev);
        int err;

        BT_DBG("%s urb %p status %d count %d", hdev->name, urb, urb->status,
               urb->actual_length);

        if (urb->status == 0) {
                struct sk_buff *skb;

                skb = bt_skb_alloc(urb->actual_length, GFP_ATOMIC);
                if (skb) {
                        skb_put_data(skb, urb->transfer_buffer,
                                     urb->actual_length);
                        hci_recv_diag(hdev, skb);
                }
        } else if (urb->status == -ENOENT) {
                /* Avoid suspend failed when usb_kill_urb */
                return;
        }

        if (!test_bit(BTUSB_DIAG_RUNNING, &data->flags))
                return;

        usb_anchor_urb(urb, &data->diag_anchor);
        usb_mark_last_busy(data->udev);

        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err < 0) {
                /* -EPERM: urb is being killed;
                 * -ENODEV: device got disconnected
                 */
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p failed to resubmit (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }
}

static int btusb_submit_diag_urb(struct hci_dev *hdev, gfp_t mem_flags)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;
        unsigned char *buf;
        unsigned int pipe;
        int err, size = HCI_MAX_FRAME_SIZE;

        BT_DBG("%s", hdev->name);

        if (!data->diag_rx_ep)
                return -ENODEV;

        urb = usb_alloc_urb(0, mem_flags);
        if (!urb)
                return -ENOMEM;

        buf = kmalloc(size, mem_flags);
        if (!buf) {
                usb_free_urb(urb);
                return -ENOMEM;
        }

        pipe = usb_rcvbulkpipe(data->udev, data->diag_rx_ep->bEndpointAddress);

        usb_fill_bulk_urb(urb, data->udev, pipe, buf, size,
                          btusb_diag_complete, hdev);

        urb->transfer_flags |= URB_FREE_BUFFER;

        usb_mark_last_busy(data->udev);
        usb_anchor_urb(urb, &data->diag_anchor);

        err = usb_submit_urb(urb, mem_flags);
        if (err < 0) {
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }

        usb_free_urb(urb);

        return err;
}

static void btusb_tx_complete(struct urb *urb)
{
        struct sk_buff *skb = urb->context;
        struct hci_dev *hdev = (struct hci_dev *)skb->dev;
        struct btusb_data *data = hci_get_drvdata(hdev);
        unsigned long flags;

        BT_DBG("%s urb %p status %d count %d", hdev->name, urb, urb->status,
               urb->actual_length);

        if (!test_bit(HCI_RUNNING, &hdev->flags))
                goto done;

        if (!urb->status)
                hdev->stat.byte_tx += urb->transfer_buffer_length;
        else
                hdev->stat.err_tx++;

done:
        spin_lock_irqsave(&data->txlock, flags);
        data->tx_in_flight--;
        spin_unlock_irqrestore(&data->txlock, flags);

        kfree(urb->setup_packet);

        kfree_skb(skb);
}

static void btusb_isoc_tx_complete(struct urb *urb)
{
        struct sk_buff *skb = urb->context;
        struct hci_dev *hdev = (struct hci_dev *)skb->dev;

        BT_DBG("%s urb %p status %d count %d", hdev->name, urb, urb->status,
               urb->actual_length);

        if (!test_bit(HCI_RUNNING, &hdev->flags))
                goto done;

        if (!urb->status)
                hdev->stat.byte_tx += urb->transfer_buffer_length;
        else
                hdev->stat.err_tx++;

done:
        kfree(urb->setup_packet);

        kfree_skb(skb);
}

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;

        /* Patching USB firmware files prior to starting any URBs of HCI path
         * It is more safe to use USB bulk channel for downloading USB patch
         */
        if (data->setup_on_usb) {
                err = data->setup_on_usb(hdev);
                if (err < 0)
                        goto setup_fail;
        }

        data->intf->needs_remote_wakeup = 1;

        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) {
                usb_kill_anchored_urbs(&data->intr_anchor);
                goto failed;
        }

        set_bit(BTUSB_BULK_RUNNING, &data->flags);
        btusb_submit_bulk_urb(hdev, GFP_KERNEL);

        if (data->diag) {
                if (!btusb_submit_diag_urb(hdev, GFP_KERNEL))
                        set_bit(BTUSB_DIAG_RUNNING, &data->flags);
        }

done:
        usb_autopm_put_interface(data->intf);
        return 0;

failed:
        clear_bit(BTUSB_INTR_RUNNING, &data->flags);
setup_fail:
        usb_autopm_put_interface(data->intf);
        return err;
}

static void btusb_stop_traffic(struct btusb_data *data)
{
        usb_kill_anchored_urbs(&data->intr_anchor);
        usb_kill_anchored_urbs(&data->bulk_anchor);
        usb_kill_anchored_urbs(&data->isoc_anchor);
        usb_kill_anchored_urbs(&data->diag_anchor);
        usb_kill_anchored_urbs(&data->ctrl_anchor);
}

static int btusb_close(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        int err;

        BT_DBG("%s", hdev->name);

        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);
        clear_bit(BTUSB_DIAG_RUNNING, &data->flags);

        btusb_stop_traffic(data);
        btusb_free_frags(data);

        err = usb_autopm_get_interface(data->intf);
        if (err < 0)
                goto failed;

        data->intf->needs_remote_wakeup = 0;

        /* Enable remote wake up for auto-suspend */
        if (test_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags))
                data->intf->needs_remote_wakeup = 1;

        usb_autopm_put_interface(data->intf);

failed:
        usb_scuttle_anchored_urbs(&data->deferred);
        return 0;
}

static int btusb_flush(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);

        BT_DBG("%s", hdev->name);

        usb_kill_anchored_urbs(&data->tx_anchor);
        btusb_free_frags(data);

        return 0;
}

static struct urb *alloc_ctrl_urb(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct usb_ctrlrequest *dr;
        struct urb *urb;
        unsigned int pipe;

        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb)
                return ERR_PTR(-ENOMEM);

        dr = kmalloc(sizeof(*dr), GFP_KERNEL);
        if (!dr) {
                usb_free_urb(urb);
                return ERR_PTR(-ENOMEM);
        }

        dr->bRequestType = data->cmdreq_type;
        dr->bRequest     = data->cmdreq;
        dr->wIndex       = 0;
        dr->wValue       = 0;
        dr->wLength      = __cpu_to_le16(skb->len);

        pipe = usb_sndctrlpipe(data->udev, 0x00);

        usb_fill_control_urb(urb, data->udev, pipe, (void *)dr,
                             skb->data, skb->len, btusb_tx_complete, skb);

        skb->dev = (void *)hdev;

        return urb;
}

static struct urb *alloc_bulk_urb(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;
        unsigned int pipe;

        if (!data->bulk_tx_ep)
                return ERR_PTR(-ENODEV);

        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb)
                return ERR_PTR(-ENOMEM);

        pipe = usb_sndbulkpipe(data->udev, data->bulk_tx_ep->bEndpointAddress);

        usb_fill_bulk_urb(urb, data->udev, pipe,
                          skb->data, skb->len, btusb_tx_complete, skb);

        skb->dev = (void *)hdev;

        return urb;
}

static struct urb *alloc_isoc_urb(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;
        unsigned int pipe;

        if (!data->isoc_tx_ep)
                return ERR_PTR(-ENODEV);

        urb = usb_alloc_urb(BTUSB_MAX_ISOC_FRAMES, GFP_KERNEL);
        if (!urb)
                return ERR_PTR(-ENOMEM);

        pipe = usb_sndisocpipe(data->udev, data->isoc_tx_ep->bEndpointAddress);

        usb_fill_int_urb(urb, data->udev, pipe,
                         skb->data, skb->len, btusb_isoc_tx_complete,
                         skb, data->isoc_tx_ep->bInterval);

        urb->transfer_flags  = URB_ISO_ASAP;

        if (data->isoc_altsetting == 6)
                __fill_isoc_descriptor_msbc(urb, skb->len,
                                            le16_to_cpu(data->isoc_tx_ep->wMaxPacketSize),
                                            data);
        else
                __fill_isoc_descriptor(urb, skb->len,
                                       le16_to_cpu(data->isoc_tx_ep->wMaxPacketSize));
        skb->dev = (void *)hdev;

        return urb;
}

static int submit_tx_urb(struct hci_dev *hdev, struct urb *urb)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        int err;

        usb_anchor_urb(urb, &data->tx_anchor);

        err = usb_submit_urb(urb, GFP_KERNEL);
        if (err < 0) {
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
                kfree(urb->setup_packet);
                usb_unanchor_urb(urb);
        } else {
                usb_mark_last_busy(data->udev);
        }

        usb_free_urb(urb);
        return err;
}

static int submit_or_queue_tx_urb(struct hci_dev *hdev, struct urb *urb)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        unsigned long flags;
        bool suspending;

        spin_lock_irqsave(&data->txlock, flags);
        suspending = test_bit(BTUSB_SUSPENDING, &data->flags);
        if (!suspending)
                data->tx_in_flight++;
        spin_unlock_irqrestore(&data->txlock, flags);

        if (!suspending)
                return submit_tx_urb(hdev, urb);

        usb_anchor_urb(urb, &data->deferred);
        schedule_work(&data->waker);

        usb_free_urb(urb);
        return 0;
}

static int btusb_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct urb *urb;

        BT_DBG("%s", hdev->name);

        switch (hci_skb_pkt_type(skb)) {
        case HCI_COMMAND_PKT:
                urb = alloc_ctrl_urb(hdev, skb);
                if (IS_ERR(urb))
                        return PTR_ERR(urb);

                hdev->stat.cmd_tx++;
                return submit_or_queue_tx_urb(hdev, urb);

        case HCI_ACLDATA_PKT:
                urb = alloc_bulk_urb(hdev, skb);
                if (IS_ERR(urb))
                        return PTR_ERR(urb);

                hdev->stat.acl_tx++;
                return submit_or_queue_tx_urb(hdev, urb);

        case HCI_SCODATA_PKT:
                if (hci_conn_num(hdev, SCO_LINK) < 1)
                        return -ENODEV;

                urb = alloc_isoc_urb(hdev, skb);
                if (IS_ERR(urb))
                        return PTR_ERR(urb);

                hdev->stat.sco_tx++;
                return submit_tx_urb(hdev, urb);
        }

        return -EILSEQ;
}

static void btusb_notify(struct hci_dev *hdev, unsigned int evt)
{
        struct btusb_data *data = hci_get_drvdata(hdev);

        BT_DBG("%s evt %d", hdev->name, evt);

        if (hci_conn_num(hdev, SCO_LINK) != data->sco_num) {
                data->sco_num = hci_conn_num(hdev, SCO_LINK);
                data->air_mode = evt;
                schedule_work(&data->work);
        }
}

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, data->isoc_ifnum, altsetting);
        if (err < 0) {
                bt_dev_err(hdev, "setting interface failed (%d)", -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_dev_err(hdev, "invalid SCO descriptors");
                return -ENODEV;
        }

        return 0;
}

static int btusb_switch_alt_setting(struct hci_dev *hdev, int new_alts)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        int err;

        if (data->isoc_altsetting != new_alts) {
                unsigned long flags;

                clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
                usb_kill_anchored_urbs(&data->isoc_anchor);

                /* When isochronous alternate setting needs to be
                 * changed, because SCO connection has been added
                 * or removed, a packet fragment may be left in the
                 * reassembling state. This could lead to wrongly
                 * assembled fragments.
                 *
                 * Clear outstanding fragment when selecting a new
                 * alternate setting.
                 */
                spin_lock_irqsave(&data->rxlock, flags);
                kfree_skb(data->sco_skb);
                data->sco_skb = NULL;
                spin_unlock_irqrestore(&data->rxlock, flags);

                err = __set_isoc_interface(hdev, new_alts);
                if (err < 0)
                        return err;
        }

        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);
        }

        return 0;
}

static struct usb_host_interface *btusb_find_altsetting(struct btusb_data *data,
                                                        int alt)
{
        struct usb_interface *intf = data->isoc;
        int i;

        BT_DBG("Looking for Alt no :%d", alt);

        if (!intf)
                return NULL;

        for (i = 0; i < intf->num_altsetting; i++) {
                if (intf->altsetting[i].desc.bAlternateSetting == alt)
                        return &intf->altsetting[i];
        }

        return NULL;
}

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 new_alts = 0;
        int err;

        if (data->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);
                                usb_kill_anchored_urbs(&data->isoc_anchor);
                                return;
                        }

                        set_bit(BTUSB_DID_ISO_RESUME, &data->flags);
                }

                if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_CVSD) {
                        if (hdev->voice_setting & 0x0020) {
                                static const int alts[3] = { 2, 4, 5 };

                                new_alts = alts[data->sco_num - 1];
                        } else {
                                new_alts = data->sco_num;
                        }
                } else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
                        /* Bluetooth USB spec recommends alt 6 (63 bytes), but
                         * many adapters do not support it.  Alt 1 appears to
                         * work for all adapters that do not have alt 6, and
                         * which work with WBS at all.  Some devices prefer
                         * alt 3 (HCI payload >= 60 Bytes let air packet
                         * data satisfy 60 bytes), requiring
                         * MTU >= 3 (packets) * 25 (size) - 3 (headers) = 72
                         * see also Core spec 5, vol 4, B 2.1.1 & Table 2.1.
                         */
                        if (btusb_find_altsetting(data, 6))
                                new_alts = 6;
                        else if (btusb_find_altsetting(data, 3) &&
                                 hdev->sco_mtu >= 72 &&
                                 test_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags))
                                new_alts = 3;
                        else
                                new_alts = 1;
                }

                if (btusb_switch_alt_setting(hdev, new_alts) < 0)
                        bt_dev_err(hdev, "set USB alt:(%d) failed!", new_alts);
        } else {
                clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
                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 void btusb_waker(struct work_struct *work)
{
        struct btusb_data *data = container_of(work, struct btusb_data, waker);
        int err;

        err = usb_autopm_get_interface(data->intf);
        if (err < 0)
                return;

        usb_autopm_put_interface(data->intf);
}

static int btusb_setup_bcm92035(struct hci_dev *hdev)
{
        struct sk_buff *skb;
        u8 val = 0x00;

        BT_DBG("%s", hdev->name);

        skb = __hci_cmd_sync(hdev, 0xfc3b, 1, &val, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb))
                bt_dev_err(hdev, "BCM92035 command failed (%ld)", PTR_ERR(skb));
        else
                kfree_skb(skb);

        return 0;
}

static int btusb_setup_csr(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        u16 bcdDevice = le16_to_cpu(data->udev->descriptor.bcdDevice);
        struct hci_rp_read_local_version *rp;
        struct sk_buff *skb;
        bool is_fake = false;
        int ret;

        BT_DBG("%s", hdev->name);

        skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
                             HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                int err = PTR_ERR(skb);
                bt_dev_err(hdev, "CSR: Local version failed (%d)", err);
                return err;
        }

        if (skb->len != sizeof(struct hci_rp_read_local_version)) {
                bt_dev_err(hdev, "CSR: Local version length mismatch");
                kfree_skb(skb);
                return -EIO;
        }

        rp = (struct hci_rp_read_local_version *)skb->data;

        /* Detect a wide host of Chinese controllers that aren't CSR.
         *
         * Known fake bcdDevices: 0x0100, 0x0134, 0x1915, 0x2520, 0x7558, 0x8891
         *
         * The main thing they have in common is that these are really popular low-cost
         * options that support newer Bluetooth versions but rely on heavy VID/PID
         * squatting of this poor old Bluetooth 1.1 device. Even sold as such.
         *
         * We detect actual CSR devices by checking that the HCI manufacturer code
         * is Cambridge Silicon Radio (10) and ensuring that LMP sub-version and
         * HCI rev values always match. As they both store the firmware number.
         */
        if (le16_to_cpu(rp->manufacturer) != 10 ||
            le16_to_cpu(rp->hci_rev) != le16_to_cpu(rp->lmp_subver))
                is_fake = true;

        /* Known legit CSR firmware build numbers and their supported BT versions:
         * - 1.1 (0x1) -> 0x0073, 0x020d, 0x033c, 0x034e
         * - 1.2 (0x2) ->                 0x04d9, 0x0529
         * - 2.0 (0x3) ->         0x07a6, 0x07ad, 0x0c5c
         * - 2.1 (0x4) ->         0x149c, 0x1735, 0x1899 (0x1899 is a BlueCore4-External)
         * - 4.0 (0x6) ->         0x1d86, 0x2031, 0x22bb
         *
         * e.g. Real CSR dongles with LMP subversion 0x73 are old enough that
         *      support BT 1.1 only; so it's a dead giveaway when some
         *      third-party BT 4.0 dongle reuses it.
         */
        else if (le16_to_cpu(rp->lmp_subver) <= 0x034e &&
                 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_1_1)
                is_fake = true;

        else if (le16_to_cpu(rp->lmp_subver) <= 0x0529 &&
                 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_1_2)
                is_fake = true;

        else if (le16_to_cpu(rp->lmp_subver) <= 0x0c5c &&
                 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_2_0)
                is_fake = true;

        else if (le16_to_cpu(rp->lmp_subver) <= 0x1899 &&
                 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_2_1)
                is_fake = true;

        else if (le16_to_cpu(rp->lmp_subver) <= 0x22bb &&
                 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_4_0)
                is_fake = true;

        /* Other clones which beat all the above checks */
        else if (bcdDevice == 0x0134 &&
                 le16_to_cpu(rp->lmp_subver) == 0x0c5c &&
                 le16_to_cpu(rp->hci_ver) == BLUETOOTH_VER_2_0)
                is_fake = true;

        if (is_fake) {
                bt_dev_warn(hdev, "CSR: Unbranded CSR clone detected; adding workarounds and force-suspending once...");

                /* Generally these clones have big discrepancies between
                 * advertised features and what's actually supported.
                 * Probably will need to be expanded in the future;
                 * without these the controller will lock up.
                 */
                set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks);
                set_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks);

                /* Clear the reset quirk since this is not an actual
                 * early Bluetooth 1.1 device from CSR.
                 */
                clear_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
                clear_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);

                /*
                 * Special workaround for these BT 4.0 chip clones, and potentially more:
                 *
                 * - 0x0134: a Barrot 8041a02                 (HCI rev: 0x1012 sub: 0x0810)
                 * - 0x7558: IC markings FR3191AHAL 749H15143 (HCI rev/sub-version: 0x0709)
                 *
                 * These controllers are really messed-up.
                 *
                 * 1. Their bulk RX endpoint will never report any data unless
                 * the device was suspended at least once (yes, really).
                 * 2. They will not wakeup when autosuspended and receiving data
                 * on their bulk RX endpoint from e.g. a keyboard or mouse
                 * (IOW remote-wakeup support is broken for the bulk endpoint).
                 *
                 * To fix 1. enable runtime-suspend, force-suspend the
                 * HCI and then wake-it up by disabling runtime-suspend.
                 *
                 * To fix 2. clear the HCI's can_wake flag, this way the HCI
                 * will still be autosuspended when it is not open.
                 *
                 * --
                 *
                 * Because these are widespread problems we prefer generic solutions; so
                 * apply this initialization quirk to every controller that gets here,
                 * it should be harmless. The alternative is to not work at all.
                 */
                pm_runtime_allow(&data->udev->dev);

                ret = pm_runtime_suspend(&data->udev->dev);
                if (ret >= 0)
                        msleep(200);
                else
                        bt_dev_err(hdev, "CSR: Failed to suspend the device for our Barrot 8041a02 receive-issue workaround");

                pm_runtime_forbid(&data->udev->dev);

                device_set_wakeup_capable(&data->udev->dev, false);

                /* Re-enable autosuspend if this was requested */
                if (enable_autosuspend)
                        usb_enable_autosuspend(data->udev);
        }

        kfree_skb(skb);

        return 0;
}

static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
{
        struct sk_buff *skb;
        struct hci_event_hdr *hdr;
        struct hci_ev_cmd_complete *evt;

        skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        hdr = skb_put(skb, sizeof(*hdr));

        hdr->evt = HCI_EV_CMD_COMPLETE;
        hdr->plen = sizeof(*evt) + 1;

        evt = skb_put(skb, sizeof(*evt));
        evt->ncmd = 0x01;
        evt->opcode = cpu_to_le16(opcode);

        skb_put_u8(skb, 0x00);

        hci_skb_pkt_type(skb) = HCI_EVENT_PKT;

        return hci_recv_frame(hdev, skb);
}

static int btusb_recv_bulk_intel(struct btusb_data *data, void *buffer,
                                 int count)
{
        struct hci_dev *hdev = data->hdev;

        /* When the device is in bootloader mode, then it can send
         * events via the bulk endpoint. These events are treated the
         * same way as the ones received from the interrupt endpoint.
         */
        if (btintel_test_flag(hdev, INTEL_BOOTLOADER))
                return btusb_recv_intr(data, buffer, count);

        return btusb_recv_bulk(data, buffer, count);
}

static int btusb_recv_event_intel(struct hci_dev *hdev, struct sk_buff *skb)
{
        if (btintel_test_flag(hdev, INTEL_BOOTLOADER)) {
                struct hci_event_hdr *hdr = (void *)skb->data;

                if (skb->len > HCI_EVENT_HDR_SIZE && hdr->evt == 0xff &&
                    hdr->plen > 0) {
                        const void *ptr = skb->data + HCI_EVENT_HDR_SIZE + 1;
                        unsigned int len = skb->len - HCI_EVENT_HDR_SIZE - 1;

                        switch (skb->data[2]) {
                        case 0x02:
                                /* When switching to the operational firmware
                                 * the device sends a vendor specific event
                                 * indicating that the bootup completed.
                                 */
                                btintel_bootup(hdev, ptr, len);
                                break;
                        case 0x06:
                                /* When the firmware loading completes the
                                 * device sends out a vendor specific event
                                 * indicating the result of the firmware
                                 * loading.
                                 */
                                btintel_secure_send_result(hdev, ptr, len);
                                break;
                        }
                }
        }

        return hci_recv_frame(hdev, skb);
}

static int btusb_send_frame_intel(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct urb *urb;

        BT_DBG("%s", hdev->name);

        switch (hci_skb_pkt_type(skb)) {
        case HCI_COMMAND_PKT:
                if (btintel_test_flag(hdev, INTEL_BOOTLOADER)) {
                        struct hci_command_hdr *cmd = (void *)skb->data;
                        __u16 opcode = le16_to_cpu(cmd->opcode);

                        /* When in bootloader mode and the command 0xfc09
                         * is received, it needs to be send down the
                         * bulk endpoint. So allocate a bulk URB instead.
                         */
                        if (opcode == 0xfc09)
                                urb = alloc_bulk_urb(hdev, skb);
                        else
                                urb = alloc_ctrl_urb(hdev, skb);

                        /* When the 0xfc01 command is issued to boot into
                         * the operational firmware, it will actually not
                         * send a command complete event. To keep the flow
                         * control working inject that event here.
                         */
                        if (opcode == 0xfc01)
                                inject_cmd_complete(hdev, opcode);
                } else {
                        urb = alloc_ctrl_urb(hdev, skb);
                }
                if (IS_ERR(urb))
                        return PTR_ERR(urb);

                hdev->stat.cmd_tx++;
                return submit_or_queue_tx_urb(hdev, urb);

        case HCI_ACLDATA_PKT:
                urb = alloc_bulk_urb(hdev, skb);
                if (IS_ERR(urb))
                        return PTR_ERR(urb);

                hdev->stat.acl_tx++;
                return submit_or_queue_tx_urb(hdev, urb);

        case HCI_SCODATA_PKT:
                if (hci_conn_num(hdev, SCO_LINK) < 1)
                        return -ENODEV;

                urb = alloc_isoc_urb(hdev, skb);
                if (IS_ERR(urb))
                        return PTR_ERR(urb);

                hdev->stat.sco_tx++;
                return submit_tx_urb(hdev, urb);
        }

        return -EILSEQ;
}

/* UHW CR mapping */
#define MTK_BT_MISC             0x70002510
#define MTK_BT_SUBSYS_RST       0x70002610
#define MTK_UDMA_INT_STA_BT     0x74000024
#define MTK_UDMA_INT_STA_BT1    0x74000308
#define MTK_BT_WDT_STATUS       0x740003A0
#define MTK_EP_RST_OPT          0x74011890
#define MTK_EP_RST_IN_OUT_OPT   0x00010001
#define MTK_BT_RST_DONE         0x00000100
#define MTK_BT_RESET_WAIT_MS    100
#define MTK_BT_RESET_NUM_TRIES  10
#define FIRMWARE_MT7663         "mediatek/mt7663pr2h.bin"
#define FIRMWARE_MT7668         "mediatek/mt7668pr2h.bin"

#define HCI_WMT_MAX_EVENT_SIZE          64
/* It is for mt79xx download rom patch*/
#define MTK_FW_ROM_PATCH_HEADER_SIZE    32
#define MTK_FW_ROM_PATCH_GD_SIZE        64
#define MTK_FW_ROM_PATCH_SEC_MAP_SIZE   64
#define MTK_SEC_MAP_COMMON_SIZE 12
#define MTK_SEC_MAP_NEED_SEND_SIZE      52

enum {
        BTMTK_WMT_PATCH_DWNLD = 0x1,
        BTMTK_WMT_FUNC_CTRL = 0x6,
        BTMTK_WMT_RST = 0x7,
        BTMTK_WMT_SEMAPHORE = 0x17,
};

enum {
        BTMTK_WMT_INVALID,
        BTMTK_WMT_PATCH_UNDONE,
        BTMTK_WMT_PATCH_PROGRESS,
        BTMTK_WMT_PATCH_DONE,
        BTMTK_WMT_ON_UNDONE,
        BTMTK_WMT_ON_DONE,
        BTMTK_WMT_ON_PROGRESS,
};

struct btmtk_wmt_hdr {
        u8      dir;
        u8      op;
        __le16  dlen;
        u8      flag;
} __packed;

struct btmtk_hci_wmt_cmd {
        struct btmtk_wmt_hdr hdr;
        u8 data[];
} __packed;

struct btmtk_hci_wmt_evt {
        struct hci_event_hdr hhdr;
        struct btmtk_wmt_hdr whdr;
} __packed;

struct btmtk_hci_wmt_evt_funcc {
        struct btmtk_hci_wmt_evt hwhdr;
        __be16 status;
} __packed;

struct btmtk_tci_sleep {
        u8 mode;
        __le16 duration;
        __le16 host_duration;
        u8 host_wakeup_pin;
        u8 time_compensation;
} __packed;

struct btmtk_hci_wmt_params {
        u8 op;
        u8 flag;
        u16 dlen;
        const void *data;
        u32 *status;
};

struct btmtk_patch_header {
        u8 datetime[16];
        u8 platform[4];
        __le16 hwver;
        __le16 swver;
        __le32 magicnum;
} __packed;

struct btmtk_global_desc {
        __le32 patch_ver;
        __le32 sub_sys;
        __le32 feature_opt;
        __le32 section_num;
} __packed;

struct btmtk_section_map {
        __le32 sectype;
        __le32 secoffset;
        __le32 secsize;
        union {
                __le32 u4SecSpec[13];
                struct {
                        __le32 dlAddr;
                        __le32 dlsize;
                        __le32 seckeyidx;
                        __le32 alignlen;
                        __le32 sectype;
                        __le32 dlmodecrctype;
                        __le32 crc;
                        __le32 reserved[6];
                } bin_info_spec;
        };
} __packed;

static int btusb_set_bdaddr_mtk(struct hci_dev *hdev, const bdaddr_t *bdaddr)
{
        struct sk_buff *skb;
        long ret;

        skb = __hci_cmd_sync(hdev, 0xfc1a, sizeof(bdaddr), bdaddr, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                ret = PTR_ERR(skb);
                bt_dev_err(hdev, "changing Mediatek device address failed (%ld)",
                           ret);
                return ret;
        }
        kfree_skb(skb);

        return 0;
}

static void btusb_mtk_wmt_recv(struct urb *urb)
{
        struct hci_dev *hdev = urb->context;
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct hci_event_hdr *hdr;
        struct sk_buff *skb;
        int err;

        if (urb->status == 0 && urb->actual_length > 0) {
                hdev->stat.byte_rx += urb->actual_length;

                /* WMT event shouldn't be fragmented and the size should be
                 * less than HCI_WMT_MAX_EVENT_SIZE.
                 */
                skb = bt_skb_alloc(HCI_WMT_MAX_EVENT_SIZE, GFP_ATOMIC);
                if (!skb) {
                        hdev->stat.err_rx++;
                        return;
                }

                hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
                skb_put_data(skb, urb->transfer_buffer, urb->actual_length);

                hdr = (void *)skb->data;
                /* Fix up the vendor event id with 0xff for vendor specific
                 * instead of 0xe4 so that event send via monitoring socket can
                 * be parsed properly.
                 */
                hdr->evt = 0xff;

                /* When someone waits for the WMT event, the skb is being cloned
                 * and being processed the events from there then.
                 */
                if (test_bit(BTUSB_TX_WAIT_VND_EVT, &data->flags)) {
                        data->evt_skb = skb_clone(skb, GFP_ATOMIC);
                        if (!data->evt_skb) {
                                kfree_skb(skb);
                                return;
                        }
                }

                err = hci_recv_frame(hdev, skb);
                if (err < 0) {
                        kfree_skb(data->evt_skb);
                        data->evt_skb = NULL;
                        return;
                }

                if (test_and_clear_bit(BTUSB_TX_WAIT_VND_EVT,
                                       &data->flags)) {
                        /* Barrier to sync with other CPUs */
                        smp_mb__after_atomic();
                        wake_up_bit(&data->flags,
                                    BTUSB_TX_WAIT_VND_EVT);
                }
                return;
        } else if (urb->status == -ENOENT) {
                /* Avoid suspend failed when usb_kill_urb */
                return;
        }

        usb_mark_last_busy(data->udev);

        /* The URB complete handler is still called with urb->actual_length = 0
         * when the event is not available, so we should keep re-submitting
         * URB until WMT event returns, Also, It's necessary to wait some time
         * between the two consecutive control URBs to relax the target device
         * to generate the event. Otherwise, the WMT event cannot return from
         * the device successfully.
         */
        udelay(500);

        usb_anchor_urb(urb, &data->ctrl_anchor);
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err < 0) {
                /* -EPERM: urb is being killed;
                 * -ENODEV: device got disconnected
                 */
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p failed to resubmit (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }
}

static int btusb_mtk_submit_wmt_recv_urb(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct usb_ctrlrequest *dr;
        unsigned char *buf;
        int err, size = 64;
        unsigned int pipe;
        struct urb *urb;

        urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!urb)
                return -ENOMEM;

        dr = kmalloc(sizeof(*dr), GFP_KERNEL);
        if (!dr) {
                usb_free_urb(urb);
                return -ENOMEM;
        }

        dr->bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;
        dr->bRequest     = 1;
        dr->wIndex       = cpu_to_le16(0);
        dr->wValue       = cpu_to_le16(48);
        dr->wLength      = cpu_to_le16(size);

        buf = kmalloc(size, GFP_KERNEL);
        if (!buf) {
                kfree(dr);
                usb_free_urb(urb);
                return -ENOMEM;
        }

        pipe = usb_rcvctrlpipe(data->udev, 0);

        usb_fill_control_urb(urb, data->udev, pipe, (void *)dr,
                             buf, size, btusb_mtk_wmt_recv, hdev);

        urb->transfer_flags |= URB_FREE_BUFFER;

        usb_anchor_urb(urb, &data->ctrl_anchor);
        err = usb_submit_urb(urb, GFP_KERNEL);
        if (err < 0) {
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
                usb_unanchor_urb(urb);
        }

        usb_free_urb(urb);

        return err;
}

static int btusb_mtk_hci_wmt_sync(struct hci_dev *hdev,
                                  struct btmtk_hci_wmt_params *wmt_params)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
        u32 hlen, status = BTMTK_WMT_INVALID;
        struct btmtk_hci_wmt_evt *wmt_evt;
        struct btmtk_hci_wmt_cmd *wc;
        struct btmtk_wmt_hdr *hdr;
        int err;

        /* Send the WMT command and wait until the WMT event returns */
        hlen = sizeof(*hdr) + wmt_params->dlen;
        if (hlen > 255)
                return -EINVAL;

        wc = kzalloc(hlen, GFP_KERNEL);
        if (!wc)
                return -ENOMEM;

        hdr = &wc->hdr;
        hdr->dir = 1;
        hdr->op = wmt_params->op;
        hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
        hdr->flag = wmt_params->flag;
        memcpy(wc->data, wmt_params->data, wmt_params->dlen);

        set_bit(BTUSB_TX_WAIT_VND_EVT, &data->flags);

        err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc);

        if (err < 0) {
                clear_bit(BTUSB_TX_WAIT_VND_EVT, &data->flags);
                goto err_free_wc;
        }

        /* Submit control IN URB on demand to process the WMT event */
        err = btusb_mtk_submit_wmt_recv_urb(hdev);
        if (err < 0)
                goto err_free_wc;

        /* The vendor specific WMT commands are all answered by a vendor
         * specific event and will have the Command Status or Command
         * Complete as with usual HCI command flow control.
         *
         * After sending the command, wait for BTUSB_TX_WAIT_VND_EVT
         * state to be cleared. The driver specific event receive routine
         * will clear that state and with that indicate completion of the
         * WMT command.
         */
        err = wait_on_bit_timeout(&data->flags, BTUSB_TX_WAIT_VND_EVT,
                                  TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
        if (err == -EINTR) {
                bt_dev_err(hdev, "Execution of wmt command interrupted");
                clear_bit(BTUSB_TX_WAIT_VND_EVT, &data->flags);
                goto err_free_wc;
        }

        if (err) {
                bt_dev_err(hdev, "Execution of wmt command timed out");
                clear_bit(BTUSB_TX_WAIT_VND_EVT, &data->flags);
                err = -ETIMEDOUT;
                goto err_free_wc;
        }

        /* Parse and handle the return WMT event */
        wmt_evt = (struct btmtk_hci_wmt_evt *)data->evt_skb->data;
        if (wmt_evt->whdr.op != hdr->op) {
                bt_dev_err(hdev, "Wrong op received %d expected %d",
                           wmt_evt->whdr.op, hdr->op);
                err = -EIO;
                goto err_free_skb;
        }

        switch (wmt_evt->whdr.op) {
        case BTMTK_WMT_SEMAPHORE:
                if (wmt_evt->whdr.flag == 2)
                        status = BTMTK_WMT_PATCH_UNDONE;
                else
                        status = BTMTK_WMT_PATCH_DONE;
                break;
        case BTMTK_WMT_FUNC_CTRL:
                wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
                if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
                        status = BTMTK_WMT_ON_DONE;
                else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
                        status = BTMTK_WMT_ON_PROGRESS;
                else
                        status = BTMTK_WMT_ON_UNDONE;
                break;
        case BTMTK_WMT_PATCH_DWNLD:
                if (wmt_evt->whdr.flag == 2)
                        status = BTMTK_WMT_PATCH_DONE;
                else if (wmt_evt->whdr.flag == 1)
                        status = BTMTK_WMT_PATCH_PROGRESS;
                else
                        status = BTMTK_WMT_PATCH_UNDONE;
                break;
        }

        if (wmt_params->status)
                *wmt_params->status = status;

err_free_skb:
        kfree_skb(data->evt_skb);
        data->evt_skb = NULL;
err_free_wc:
        kfree(wc);
        return err;
}

static int btusb_mtk_setup_firmware_79xx(struct hci_dev *hdev, const char *fwname)
{
        struct btmtk_hci_wmt_params wmt_params;
        struct btmtk_global_desc *globaldesc = NULL;
        struct btmtk_section_map *sectionmap;
        const struct firmware *fw;
        const u8 *fw_ptr;
        const u8 *fw_bin_ptr;
        int err, dlen, i, status;
        u8 flag, first_block, retry;
        u32 section_num, dl_size, section_offset;
        u8 cmd[64];

        err = request_firmware(&fw, fwname, &hdev->dev);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
                return err;
        }

        fw_ptr = fw->data;
        fw_bin_ptr = fw_ptr;
        globaldesc = (struct btmtk_global_desc *)(fw_ptr + MTK_FW_ROM_PATCH_HEADER_SIZE);
        section_num = le32_to_cpu(globaldesc->section_num);

        for (i = 0; i < section_num; i++) {
                first_block = 1;
                fw_ptr = fw_bin_ptr;
                sectionmap = (struct btmtk_section_map *)(fw_ptr + MTK_FW_ROM_PATCH_HEADER_SIZE +
                              MTK_FW_ROM_PATCH_GD_SIZE + MTK_FW_ROM_PATCH_SEC_MAP_SIZE * i);

                section_offset = le32_to_cpu(sectionmap->secoffset);
                dl_size = le32_to_cpu(sectionmap->bin_info_spec.dlsize);

                if (dl_size > 0) {
                        retry = 20;
                        while (retry > 0) {
                                cmd[0] = 0; /* 0 means legacy dl mode. */
                                memcpy(cmd + 1,
                                       fw_ptr + MTK_FW_ROM_PATCH_HEADER_SIZE +
                                       MTK_FW_ROM_PATCH_GD_SIZE + MTK_FW_ROM_PATCH_SEC_MAP_SIZE * i +
                                       MTK_SEC_MAP_COMMON_SIZE,
                                       MTK_SEC_MAP_NEED_SEND_SIZE + 1);

                                wmt_params.op = BTMTK_WMT_PATCH_DWNLD;
                                wmt_params.status = &status;
                                wmt_params.flag = 0;
                                wmt_params.dlen = MTK_SEC_MAP_NEED_SEND_SIZE + 1;
                                wmt_params.data = &cmd;

                                err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
                                if (err < 0) {
                                        bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
                                                   err);
                                        goto err_release_fw;
                                }

                                if (status == BTMTK_WMT_PATCH_UNDONE) {
                                        break;
                                } else if (status == BTMTK_WMT_PATCH_PROGRESS) {
                                        msleep(100);
                                        retry--;
                                } else if (status == BTMTK_WMT_PATCH_DONE) {
                                        goto next_section;
                                } else {
                                        bt_dev_err(hdev, "Failed wmt patch dwnld status (%d)",
                                                   status);
                                        goto err_release_fw;
                                }
                        }

                        fw_ptr += section_offset;
                        wmt_params.op = BTMTK_WMT_PATCH_DWNLD;
                        wmt_params.status = NULL;

                        while (dl_size > 0) {
                                dlen = min_t(int, 250, dl_size);
                                if (first_block == 1) {
                                        flag = 1;
                                        first_block = 0;
                                } else if (dl_size - dlen <= 0) {
                                        flag = 3;
                                } else {
                                        flag = 2;
                                }

                                wmt_params.flag = flag;
                                wmt_params.dlen = dlen;
                                wmt_params.data = fw_ptr;

                                err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
                                if (err < 0) {
                                        bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
                                                   err);
                                        goto err_release_fw;
                                }

                                dl_size -= dlen;
                                fw_ptr += dlen;
                        }
                }
next_section:
                continue;
        }
        /* Wait a few moments for firmware activation done */
        usleep_range(100000, 120000);

err_release_fw:
        release_firmware(fw);

        return err;
}

static int btusb_mtk_setup_firmware(struct hci_dev *hdev, const char *fwname)
{
        struct btmtk_hci_wmt_params wmt_params;
        const struct firmware *fw;
        const u8 *fw_ptr;
        size_t fw_size;
        int err, dlen;
        u8 flag, param;

        err = request_firmware(&fw, fwname, &hdev->dev);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
                return err;
        }

        /* Power on data RAM the firmware relies on. */
        param = 1;
        wmt_params.op = BTMTK_WMT_FUNC_CTRL;
        wmt_params.flag = 3;
        wmt_params.dlen = sizeof(param);
        wmt_params.data = &param;
        wmt_params.status = NULL;

        err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to power on data RAM (%d)", err);
                goto err_release_fw;
        }

        fw_ptr = fw->data;
        fw_size = fw->size;

        /* The size of patch header is 30 bytes, should be skip */
        if (fw_size < 30) {
                err = -EINVAL;
                goto err_release_fw;
        }

        fw_size -= 30;
        fw_ptr += 30;
        flag = 1;

        wmt_params.op = BTMTK_WMT_PATCH_DWNLD;
        wmt_params.status = NULL;

        while (fw_size > 0) {
                dlen = min_t(int, 250, fw_size);

                /* Tell device the position in sequence */
                if (fw_size - dlen <= 0)
                        flag = 3;
                else if (fw_size < fw->size - 30)
                        flag = 2;

                wmt_params.flag = flag;
                wmt_params.dlen = dlen;
                wmt_params.data = fw_ptr;

                err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
                if (err < 0) {
                        bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
                                   err);
                        goto err_release_fw;
                }

                fw_size -= dlen;
                fw_ptr += dlen;
        }

        wmt_params.op = BTMTK_WMT_RST;
        wmt_params.flag = 4;
        wmt_params.dlen = 0;
        wmt_params.data = NULL;
        wmt_params.status = NULL;

        /* Activate funciton the firmware providing to */
        err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
                goto err_release_fw;
        }

        /* Wait a few moments for firmware activation done */
        usleep_range(10000, 12000);

err_release_fw:
        release_firmware(fw);

        return err;
}

static int btusb_mtk_func_query(struct hci_dev *hdev)
{
        struct btmtk_hci_wmt_params wmt_params;
        int status, err;
        u8 param = 0;

        /* Query whether the function is enabled */
        wmt_params.op = BTMTK_WMT_FUNC_CTRL;
        wmt_params.flag = 4;
        wmt_params.dlen = sizeof(param);
        wmt_params.data = &param;
        wmt_params.status = &status;

        err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to query function status (%d)", err);
                return err;
        }

        return status;
}

static int btusb_mtk_uhw_reg_write(struct btusb_data *data, u32 reg, u32 val)
{
        struct hci_dev *hdev = data->hdev;
        int pipe, err;
        void *buf;

        buf = kzalloc(4, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        put_unaligned_le32(val, buf);

        pipe = usb_sndctrlpipe(data->udev, 0);
        err = usb_control_msg(data->udev, pipe, 0x02,
                              0x5E,
                              reg >> 16, reg & 0xffff,
                              buf, 4, USB_CTRL_SET_TIMEOUT);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to write uhw reg(%d)", err);
                goto err_free_buf;
        }

err_free_buf:
        kfree(buf);

        return err;
}

static int btusb_mtk_uhw_reg_read(struct btusb_data *data, u32 reg, u32 *val)
{
        struct hci_dev *hdev = data->hdev;
        int pipe, err;
        void *buf;

        buf = kzalloc(4, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        pipe = usb_rcvctrlpipe(data->udev, 0);
        err = usb_control_msg(data->udev, pipe, 0x01,
                              0xDE,
                              reg >> 16, reg & 0xffff,
                              buf, 4, USB_CTRL_SET_TIMEOUT);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to read uhw reg(%d)", err);
                goto err_free_buf;
        }

        *val = get_unaligned_le32(buf);
        bt_dev_dbg(hdev, "reg=%x, value=0x%08x", reg, *val);

err_free_buf:
        kfree(buf);

        return err;
}

static int btusb_mtk_reg_read(struct btusb_data *data, u32 reg, u32 *val)
{
        int pipe, err, size = sizeof(u32);
        void *buf;

        buf = kzalloc(size, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        pipe = usb_rcvctrlpipe(data->udev, 0);
        err = usb_control_msg(data->udev, pipe, 0x63,
                              USB_TYPE_VENDOR | USB_DIR_IN,
                              reg >> 16, reg & 0xffff,
                              buf, size, USB_CTRL_SET_TIMEOUT);
        if (err < 0)
                goto err_free_buf;

        *val = get_unaligned_le32(buf);

err_free_buf:
        kfree(buf);

        return err;
}

static int btusb_mtk_id_get(struct btusb_data *data, u32 reg, u32 *id)
{
        return btusb_mtk_reg_read(data, reg, id);
}

static int btusb_mtk_setup(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct btmtk_hci_wmt_params wmt_params;
        ktime_t calltime, delta, rettime;
        struct btmtk_tci_sleep tci_sleep;
        unsigned long long duration;
        struct sk_buff *skb;
        const char *fwname;
        int err, status;
        u32 dev_id;
        char fw_bin_name[64];
        u32 fw_version = 0;
        u8 param;

        calltime = ktime_get();

        err = btusb_mtk_id_get(data, 0x80000008, &dev_id);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to get device id (%d)", err);
                return err;
        }

        if (!dev_id) {
                err = btusb_mtk_id_get(data, 0x70010200, &dev_id);
                if (err < 0) {
                        bt_dev_err(hdev, "Failed to get device id (%d)", err);
                        return err;
                }
                err = btusb_mtk_id_get(data, 0x80021004, &fw_version);
                if (err < 0) {
                        bt_dev_err(hdev, "Failed to get fw version (%d)", err);
                        return err;
                }
        }

        switch (dev_id) {
        case 0x7663:
                fwname = FIRMWARE_MT7663;
                break;
        case 0x7668:
                fwname = FIRMWARE_MT7668;
                break;
        case 0x7922:
        case 0x7961:
                snprintf(fw_bin_name, sizeof(fw_bin_name),
                        "mediatek/BT_RAM_CODE_MT%04x_1_%x_hdr.bin",
                         dev_id & 0xffff, (fw_version & 0xff) + 1);
                err = btusb_mtk_setup_firmware_79xx(hdev, fw_bin_name);

                /* It's Device EndPoint Reset Option Register */
                btusb_mtk_uhw_reg_write(data, MTK_EP_RST_OPT, MTK_EP_RST_IN_OUT_OPT);

                /* Enable Bluetooth protocol */
                param = 1;
                wmt_params.op = BTMTK_WMT_FUNC_CTRL;
                wmt_params.flag = 0;
                wmt_params.dlen = sizeof(param);
                wmt_params.data = &param;
                wmt_params.status = NULL;

                err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
                if (err < 0) {
                        bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
                        return err;
                }

                hci_set_msft_opcode(hdev, 0xFD30);
                goto done;
        default:
                bt_dev_err(hdev, "Unsupported hardware variant (%08x)",
                           dev_id);
                return -ENODEV;
        }

        /* Query whether the firmware is already download */
        wmt_params.op = BTMTK_WMT_SEMAPHORE;
        wmt_params.flag = 1;
        wmt_params.dlen = 0;
        wmt_params.data = NULL;
        wmt_params.status = &status;

        err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
                return err;
        }

        if (status == BTMTK_WMT_PATCH_DONE) {
                bt_dev_info(hdev, "firmware already downloaded");
                goto ignore_setup_fw;
        }

        /* Setup a firmware which the device definitely requires */
        err = btusb_mtk_setup_firmware(hdev, fwname);
        if (err < 0)
                return err;

ignore_setup_fw:
        err = readx_poll_timeout(btusb_mtk_func_query, hdev, status,
                                 status < 0 || status != BTMTK_WMT_ON_PROGRESS,
                                 2000, 5000000);
        /* -ETIMEDOUT happens */
        if (err < 0)
                return err;

        /* The other errors happen in btusb_mtk_func_query */
        if (status < 0)
                return status;

        if (status == BTMTK_WMT_ON_DONE) {
                bt_dev_info(hdev, "function already on");
                goto ignore_func_on;
        }

        /* Enable Bluetooth protocol */
        param = 1;
        wmt_params.op = BTMTK_WMT_FUNC_CTRL;
        wmt_params.flag = 0;
        wmt_params.dlen = sizeof(param);
        wmt_params.data = &param;
        wmt_params.status = NULL;

        err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
                return err;
        }

ignore_func_on:
        /* Apply the low power environment setup */
        tci_sleep.mode = 0x5;
        tci_sleep.duration = cpu_to_le16(0x640);
        tci_sleep.host_duration = cpu_to_le16(0x640);
        tci_sleep.host_wakeup_pin = 0;
        tci_sleep.time_compensation = 0;

        skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
                             HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                err = PTR_ERR(skb);
                bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
                return err;
        }
        kfree_skb(skb);

done:
        rettime = ktime_get();
        delta = ktime_sub(rettime, calltime);
        duration = (unsigned long long)ktime_to_ns(delta) >> 10;

        bt_dev_info(hdev, "Device setup in %llu usecs", duration);

        return 0;
}

static int btusb_mtk_shutdown(struct hci_dev *hdev)
{
        struct btmtk_hci_wmt_params wmt_params;
        u8 param = 0;
        int err;

        /* Disable the device */
        wmt_params.op = BTMTK_WMT_FUNC_CTRL;
        wmt_params.flag = 0;
        wmt_params.dlen = sizeof(param);
        wmt_params.data = &param;
        wmt_params.status = NULL;

        err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
                return err;
        }

        return 0;
}

static void btusb_mtk_cmd_timeout(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        u32 val;
        int err, retry = 0;

        /* It's MediaTek specific bluetooth reset mechanism via USB */
        if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
                bt_dev_err(hdev, "last reset failed? Not resetting again");
                return;
        }