// 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             0x100
#define BTUSB_INTEL_BOOT        0x200
#define BTUSB_BCM_PATCHRAM      0x400
#define BTUSB_MARVELL           0x800
#define BTUSB_SWAVE             0x1000
#define BTUSB_INTEL_NEW         0x2000
#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

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 BCM20702A0 */
        { USB_DEVICE(0x413c, 0x8197) },

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

        /* 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_NEW |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },
        { USB_DEVICE(0x8087, 0x0026), .driver_info = BTUSB_INTEL_NEW |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x8087, 0x0029), .driver_info = BTUSB_INTEL_NEW |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x8087, 0x0032), .driver_info = BTUSB_INTEL_NEW |
                                                     BTUSB_WIDEBAND_SPEECH},
        { USB_DEVICE(0x8087, 0x07da), .driver_info = BTUSB_CSR },
        { USB_DEVICE(0x8087, 0x07dc), .driver_info = BTUSB_INTEL },
        { USB_DEVICE(0x8087, 0x0a2a), .driver_info = BTUSB_INTEL },
        { USB_DEVICE(0x8087, 0x0a2b), .driver_info = BTUSB_INTEL_NEW |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x8087, 0x0aa7), .driver_info = BTUSB_INTEL |
                                                     BTUSB_WIDEBAND_SPEECH },
        { USB_DEVICE(0x8087, 0x0aaa), .driver_info = BTUSB_INTEL_NEW |
                                                     BTUSB_WIDEBAND_SPEECH |
                                                     BTUSB_VALID_LE_STATES },

        /* 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 },

        /* 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 },

        /* 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 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 },
        { USB_DEVICE(0x13d3, 0x3548), .driver_info = BTUSB_REALTEK },

        /* 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_DISABLE    14
#define BTUSB_USE_ALT1_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_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);
        int err;

        if (++data->cmd_timeout_cnt < 5)
                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 */
                        hci_recv_frame(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;

        /* Disable device remote wakeup when host is suspended
         * For Realtek chips, global suspend without
         * SET_FEATURE (DEVICE_REMOTE_WAKEUP) can save more power in device.
         */
        if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
                device_wakeup_disable(&data->udev->dev);

        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_DISABLE, &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) {
                        /* Check if Alt 6 is supported for Transparent audio */
                        if (btusb_find_altsetting(data, 6)) {
                                data->usb_alt6_packet_flow = true;
                                new_alts = 6;
                        } else if (test_bit(BTUSB_USE_ALT1_FOR_WBS, &data->flags)) {
                                new_alts = 1;
                        } else {
                                bt_dev_err(hdev, "Device does not support ALT setting 6");
                        }
                }

                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 hci_rp_read_local_version *rp;
        struct sk_buff *skb;
        bool is_fake = false;

        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;

        if (is_fake) {
                bt_dev_warn(hdev, "CSR: Unbranded CSR clone detected; adding workarounds...");

                /* 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);
        }

        kfree_skb(skb);

        return 0;
}

static const struct firmware *btusb_setup_intel_get_fw(struct hci_dev *hdev,
                                                       struct intel_version *ver)
{
        const struct firmware *fw;
        char fwname[64];
        int ret;

        snprintf(fwname, sizeof(fwname),
                 "intel/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.bseq",
                 ver->hw_platform, ver->hw_variant, ver->hw_revision,
                 ver->fw_variant,  ver->fw_revision, ver->fw_build_num,
                 ver->fw_build_ww, ver->fw_build_yy);

        ret = request_firmware(&fw, fwname, &hdev->dev);
        if (ret < 0) {
                if (ret == -EINVAL) {
                        bt_dev_err(hdev, "Intel firmware file request failed (%d)",
                                   ret);
                        return NULL;
                }

                bt_dev_err(hdev, "failed to open Intel firmware file: %s (%d)",
                           fwname, ret);

                /* If the correct firmware patch file is not found, use the
                 * default firmware patch file instead
                 */
                snprintf(fwname, sizeof(fwname), "intel/ibt-hw-%x.%x.bseq",
                         ver->hw_platform, ver->hw_variant);
                if (request_firmware(&fw, fwname, &hdev->dev) < 0) {
                        bt_dev_err(hdev, "failed to open default fw file: %s",
                                   fwname);
                        return NULL;
                }
        }

        bt_dev_info(hdev, "Intel Bluetooth firmware file: %s", fwname);

        return fw;
}

static int btusb_setup_intel_patching(struct hci_dev *hdev,
                                      const struct firmware *fw,
                                      const u8 **fw_ptr, int *disable_patch)
{
        struct sk_buff *skb;
        struct hci_command_hdr *cmd;
        const u8 *cmd_param;
        struct hci_event_hdr *evt = NULL;
        const u8 *evt_param = NULL;
        int remain = fw->size - (*fw_ptr - fw->data);

        /* The first byte indicates the types of the patch command or event.
         * 0x01 means HCI command and 0x02 is HCI event. If the first bytes
         * in the current firmware buffer doesn't start with 0x01 or
         * the size of remain buffer is smaller than HCI command header,
         * the firmware file is corrupted and it should stop the patching
         * process.
         */
        if (remain > HCI_COMMAND_HDR_SIZE && *fw_ptr[0] != 0x01) {
                bt_dev_err(hdev, "Intel fw corrupted: invalid cmd read");
                return -EINVAL;
        }
        (*fw_ptr)++;
        remain--;

        cmd = (struct hci_command_hdr *)(*fw_ptr);
        *fw_ptr += sizeof(*cmd);
        remain -= sizeof(*cmd);

        /* Ensure that the remain firmware data is long enough than the length
         * of command parameter. If not, the firmware file is corrupted.
         */
        if (remain < cmd->plen) {
                bt_dev_err(hdev, "Intel fw corrupted: invalid cmd len");
                return -EFAULT;
        }

        /* If there is a command that loads a patch in the firmware
         * file, then enable the patch upon success, otherwise just
         * disable the manufacturer mode, for example patch activation
         * is not required when the default firmware patch file is used
         * because there are no patch data to load.
         */
        if (*disable_patch && le16_to_cpu(cmd->opcode) == 0xfc8e)
                *disable_patch = 0;

        cmd_param = *fw_ptr;
        *fw_ptr += cmd->plen;
        remain -= cmd->plen;

        /* This reads the expected events when the above command is sent to the
         * device. Some vendor commands expects more than one events, for
         * example command status event followed by vendor specific event.
         * For this case, it only keeps the last expected event. so the command
         * can be sent with __hci_cmd_sync_ev() which returns the sk_buff of
         * last expected event.
         */
        while (remain > HCI_EVENT_HDR_SIZE && *fw_ptr[0] == 0x02) {
                (*fw_ptr)++;
                remain--;

                evt = (struct hci_event_hdr *)(*fw_ptr);
                *fw_ptr += sizeof(*evt);
                remain -= sizeof(*evt);

                if (remain < evt->plen) {
                        bt_dev_err(hdev, "Intel fw corrupted: invalid evt len");
                        return -EFAULT;
                }

                evt_param = *fw_ptr;
                *fw_ptr += evt->plen;
                remain -= evt->plen;
        }

        /* Every HCI commands in the firmware file has its correspond event.
         * If event is not found or remain is smaller than zero, the firmware
         * file is corrupted.
         */
        if (!evt || !evt_param || remain < 0) {
                bt_dev_err(hdev, "Intel fw corrupted: invalid evt read");
                return -EFAULT;
        }

        skb = __hci_cmd_sync_ev(hdev, le16_to_cpu(cmd->opcode), cmd->plen,
                                cmd_param, evt->evt, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                bt_dev_err(hdev, "sending Intel patch command (0x%4.4x) failed (%ld)",
                           cmd->opcode, PTR_ERR(skb));
                return PTR_ERR(skb);
        }

        /* It ensures that the returned event matches the event data read from
         * the firmware file. At fist, it checks the length and then
         * the contents of the event.
         */
        if (skb->len != evt->plen) {
                bt_dev_err(hdev, "mismatch event length (opcode 0x%4.4x)",
                           le16_to_cpu(cmd->opcode));
                kfree_skb(skb);
                return -EFAULT;
        }

        if (memcmp(skb->data, evt_param, evt->plen)) {
                bt_dev_err(hdev, "mismatch event parameter (opcode 0x%4.4x)",
                           le16_to_cpu(cmd->opcode));
                kfree_skb(skb);
                return -EFAULT;
        }
        kfree_skb(skb);

        return 0;
}

static int btusb_setup_intel(struct hci_dev *hdev)
{
        struct sk_buff *skb;
        const struct firmware *fw;
        const u8 *fw_ptr;
        int disable_patch, err;
        struct intel_version ver;

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

        /* The controller has a bug with the first HCI command sent to it

         * returning number of completed commands as zero. This would stall the
         * command processing in the Bluetooth core.
         *
         * As a workaround, send HCI Reset command first which will reset the
         * number of completed commands and allow normal command processing
         * from now on.
         */
        skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                bt_dev_err(hdev, "sending initial HCI reset command failed (%ld)",
                           PTR_ERR(skb));
                return PTR_ERR(skb);
        }
        kfree_skb(skb);

        /* Read Intel specific controller version first to allow selection of
         * which firmware file to load.
         *
         * The returned information are hardware variant and revision plus
         * firmware variant, revision and build number.
         */
        err = btintel_read_version(hdev, &ver);
        if (err)
                return err;

        bt_dev_info(hdev, "read Intel version: %02x%02x%02x%02x%02x%02x%02x%02x%02x",
                    ver.hw_platform, ver.hw_variant, ver.hw_revision,
                    ver.fw_variant,  ver.fw_revision, ver.fw_build_num,
                    ver.fw_build_ww, ver.fw_build_yy, ver.fw_patch_num);

        /* fw_patch_num indicates the version of patch the device currently
         * have. If there is no patch data in the device, it is always 0x00.
         * So, if it is other than 0x00, no need to patch the device again.
         */
        if (ver.fw_patch_num) {
                bt_dev_info(hdev, "Intel device is already patched. "
                            "patch num: %02x", ver.fw_patch_num);
                goto complete;
        }

        /* Opens the firmware patch file based on the firmware version read
         * from the controller. If it fails to open the matching firmware
         * patch file, it tries to open the default firmware patch file.
         * If no patch file is found, allow the device to operate without
         * a patch.
         */
        fw = btusb_setup_intel_get_fw(hdev, &ver);
        if (!fw)
                goto complete;
        fw_ptr = fw->data;

        /* Enable the manufacturer mode of the controller.
         * Only while this mode is enabled, the driver can download the
         * firmware patch data and configuration parameters.
         */
        err = btintel_enter_mfg(hdev);
        if (err) {
                release_firmware(fw);
                return err;
        }

        disable_patch = 1;

        /* The firmware data file consists of list of Intel specific HCI
         * commands and its expected events. The first byte indicates the
         * type of the message, either HCI command or HCI event.
         *
         * It reads the command and its expected event from the firmware file,
         * and send to the controller. Once __hci_cmd_sync_ev() returns,
         * the returned event is compared with the event read from the firmware
         * file and it will continue until all the messages are downloaded to
         * the controller.
         *
         * Once the firmware patching is completed successfully,
         * the manufacturer mode is disabled with reset and activating the
         * downloaded patch.
         *
         * If the firmware patching fails, the manufacturer mode is
         * disabled with reset and deactivating the patch.
         *
         * If the default patch file is used, no reset is done when disabling
         * the manufacturer.
         */
        while (fw->size > fw_ptr - fw->data) {
                int ret;

                ret = btusb_setup_intel_patching(hdev, fw, &fw_ptr,
                                                 &disable_patch);
                if (ret < 0)
                        goto exit_mfg_deactivate;
        }

        release_firmware(fw);

        if (disable_patch)
                goto exit_mfg_disable;

        /* Patching completed successfully and disable the manufacturer mode
         * with reset and activate the downloaded firmware patches.
         */
        err = btintel_exit_mfg(hdev, true, true);
        if (err)
                return err;

        /* Need build number for downloaded fw patches in
         * every power-on boot
         */
       err = btintel_read_version(hdev, &ver);
       if (err)
               return err;
       bt_dev_info(hdev, "Intel BT fw patch 0x%02x completed & activated",
                   ver.fw_patch_num);

        goto complete;

exit_mfg_disable:
        /* Disable the manufacturer mode without reset */
        err = btintel_exit_mfg(hdev, false, false);
        if (err)
                return err;

        bt_dev_info(hdev, "Intel firmware patch completed");

        goto complete;

exit_mfg_deactivate:
        release_firmware(fw);

        /* Patching failed. Disable the manufacturer mode with reset and
         * deactivate the downloaded firmware patches.
         */
        err = btintel_exit_mfg(hdev, true, false);
        if (err)
                return err;

        bt_dev_info(hdev, "Intel firmware patch completed and deactivated");

complete:
        /* Set the event mask for Intel specific vendor events. This enables
         * a few extra events that are useful during general operation.
         */
        btintel_set_event_mask_mfg(hdev, false);

        btintel_check_bdaddr(hdev);
        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)
{
        /* 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 (test_bit(BTUSB_BOOTLOADER, &data->flags))
                return btusb_recv_intr(data, buffer, count);

        return btusb_recv_bulk(data, buffer, count);
}

static void btusb_intel_bootup(struct btusb_data *data, const void *ptr,
                               unsigned int len)
{
        const struct intel_bootup *evt = ptr;

        if (len != sizeof(*evt))
                return;

        if (test_and_clear_bit(BTUSB_BOOTING, &data->flags))
                wake_up_bit(&data->flags, BTUSB_BOOTING);
}

static void btusb_intel_secure_send_result(struct btusb_data *data,
                                           const void *ptr, unsigned int len)
{
        const struct intel_secure_send_result *evt = ptr;

        if (len != sizeof(*evt))
                return;

        if (evt->result)
                set_bit(BTUSB_FIRMWARE_FAILED, &data->flags);

        if (test_and_clear_bit(BTUSB_DOWNLOADING, &data->flags) &&
            test_bit(BTUSB_FIRMWARE_LOADED, &data->flags))
                wake_up_bit(&data->flags, BTUSB_DOWNLOADING);
}

static int btusb_recv_event_intel(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct btusb_data *data = hci_get_drvdata(hdev);

        if (test_bit(BTUSB_BOOTLOADER, &data->flags)) {
                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.
                                 */
                                btusb_intel_bootup(data, 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.
                                 */
                                btusb_intel_secure_send_result(data, ptr, len);
                                break;
                        }
                }
        }

        return hci_recv_frame(hdev, skb);
}

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

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

        switch (hci_skb_pkt_type(skb)) {
        case HCI_COMMAND_PKT:
                if (test_bit(BTUSB_BOOTLOADER, &data->flags)) {
                        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;
}

static bool btusb_setup_intel_new_get_fw_name(struct intel_version *ver,
                                             struct intel_boot_params *params,
                                             char *fw_name, size_t len,
                                             const char *suffix)
{
        switch (ver->hw_variant) {
        case 0x0b:      /* SfP */
        case 0x0c:      /* WsP */
                snprintf(fw_name, len, "intel/ibt-%u-%u.%s",
                        le16_to_cpu(ver->hw_variant),
                        le16_to_cpu(params->dev_revid),
                        suffix);
                break;
        case 0x11:      /* JfP */
        case 0x12:      /* ThP */
        case 0x13:      /* HrP */
        case 0x14:      /* CcP */
                snprintf(fw_name, len, "intel/ibt-%u-%u-%u.%s",
                        le16_to_cpu(ver->hw_variant),
                        le16_to_cpu(ver->hw_revision),
                        le16_to_cpu(ver->fw_revision),
                        suffix);
                break;
        default:
                return false;
        }
        return true;
}

static int btusb_intel_download_firmware(struct hci_dev *hdev,
                                         struct intel_version *ver,
                                         struct intel_boot_params *params)
{
        const struct firmware *fw;
        u32 boot_param;
        char fwname[64];
        int err;
        struct btusb_data *data = hci_get_drvdata(hdev);

        if (!ver || !params)
                return -EINVAL;

        /* The hardware platform number has a fixed value of 0x37 and
         * for now only accept this single value.
         */
        if (ver->hw_platform != 0x37) {
                bt_dev_err(hdev, "Unsupported Intel hardware platform (%u)",
                           ver->hw_platform);
                return -EINVAL;
        }

        /* Check for supported iBT hardware variants of this firmware
         * loading method.
         *
         * This check has been put in place to ensure correct forward
         * compatibility options when newer hardware variants come along.
         */
        switch (ver->hw_variant) {
        case 0x0b:      /* SfP */
        case 0x0c:      /* WsP */
        case 0x11:      /* JfP */
        case 0x12:      /* ThP */
        case 0x13:      /* HrP */
        case 0x14:      /* CcP */
                break;
        default:
                bt_dev_err(hdev, "Unsupported Intel hardware variant (%u)",
                           ver->hw_variant);
                return -EINVAL;
        }

        btintel_version_info(hdev, ver);

        /* The firmware variant determines if the device is in bootloader
         * mode or is running operational firmware. The value 0x06 identifies
         * the bootloader and the value 0x23 identifies the operational
         * firmware.
         *
         * When the operational firmware is already present, then only
         * the check for valid Bluetooth device address is needed. This
         * determines if the device will be added as configured or
         * unconfigured controller.
         *
         * It is not possible to use the Secure Boot Parameters in this
         * case since that command is only available in bootloader mode.
         */
        if (ver->fw_variant == 0x23) {
                clear_bit(BTUSB_BOOTLOADER, &data->flags);
                btintel_check_bdaddr(hdev);
                return 0;
        }

        /* If the device is not in bootloader mode, then the only possible
         * choice is to return an error and abort the device initialization.
         */
        if (ver->fw_variant != 0x06) {
                bt_dev_err(hdev, "Unsupported Intel firmware variant (%u)",
                           ver->fw_variant);
                return -ENODEV;
        }

        /* Read the secure boot parameters to identify the operating
         * details of the bootloader.
         */
        err = btintel_read_boot_params(hdev, params);
        if (err)
                return err;

        /* It is required that every single firmware fragment is acknowledged
         * with a command complete event. If the boot parameters indicate
         * that this bootloader does not send them, then abort the setup.
         */
        if (params->limited_cce != 0x00) {
                bt_dev_err(hdev, "Unsupported Intel firmware loading method (%u)",
                           params->limited_cce);
                return -EINVAL;
        }

        /* If the OTP has no valid Bluetooth device address, then there will
         * also be no valid address for the operational firmware.
         */
        if (!bacmp(&params->otp_bdaddr, BDADDR_ANY)) {
                bt_dev_info(hdev, "No device address configured");
                set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
        }

        /* With this Intel bootloader only the hardware variant and device
         * revision information are used to select the right firmware for SfP
         * and WsP.
         *
         * The firmware filename is ibt-<hw_variant>-<dev_revid>.sfi.
         *
         * Currently the supported hardware variants are:
         *   11 (0x0b) for iBT3.0 (LnP/SfP)
         *   12 (0x0c) for iBT3.5 (WsP)
         *
         * For ThP/JfP and for future SKU's, the FW name varies based on HW
         * variant, HW revision and FW revision, as these are dependent on CNVi
         * and RF Combination.
         *
         *   17 (0x11) for iBT3.5 (JfP)
         *   18 (0x12) for iBT3.5 (ThP)
         *
         * The firmware file name for these will be
         * ibt-<hw_variant>-<hw_revision>-<fw_revision>.sfi.
         *
         */
        err = btusb_setup_intel_new_get_fw_name(ver, params, fwname,
                                                sizeof(fwname), "sfi");
        if (!err) {
                bt_dev_err(hdev, "Unsupported Intel firmware naming");
                return -EINVAL;
        }

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

        bt_dev_info(hdev, "Found device firmware: %s", fwname);

        if (fw->size < 644) {
                bt_dev_err(hdev, "Invalid size of firmware file (%zu)",
                           fw->size);
                err = -EBADF;
                goto done;
        }

        set_bit(BTUSB_DOWNLOADING, &data->flags);

        /* Start firmware downloading and get boot parameter */
        err = btintel_download_firmware(hdev, fw, &boot_param);
        if (err < 0) {
                /* When FW download fails, send Intel Reset to retry
                 * FW download.
                 */
                btintel_reset_to_bootloader(hdev);
                goto done;
        }
        set_bit(BTUSB_FIRMWARE_LOADED, &data->flags);

        bt_dev_info(hdev, "Waiting for firmware download to complete");

        /* Before switching the device into operational mode and with that
         * booting the loaded firmware, wait for the bootloader notification
         * that all fragments have been successfully received.
         *
         * When the event processing receives the notification, then the
         * BTUSB_DOWNLOADING flag will be cleared.
         *
         * The firmware loading should not take longer than 5 seconds
         * and thus just timeout if that happens and fail the setup
         * of this device.
         */
        err = wait_on_bit_timeout(&data->flags, BTUSB_DOWNLOADING,
                                  TASK_INTERRUPTIBLE,
                                  msecs_to_jiffies(5000));
        if (err == -EINTR) {
                bt_dev_err(hdev, "Firmware loading interrupted");
                goto done;
        }

        if (err) {
                bt_dev_err(hdev, "Firmware loading timeout");
                err = -ETIMEDOUT;
                btintel_reset_to_bootloader(hdev);
                goto done;
        }

        if (test_bit(BTUSB_FIRMWARE_FAILED, &data->flags)) {
                bt_dev_err(hdev, "Firmware loading failed");
                err = -ENOEXEC;
                goto done;
        }

done:
        release_firmware(fw);
        return err;
}

static int btusb_setup_intel_new(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct intel_version ver;
        struct intel_boot_params params;
        u32 boot_param;
        char ddcname[64];
        ktime_t calltime, delta, rettime;
        unsigned long long duration;
        int err;
        struct intel_debug_features features;

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

        /* Set the default boot parameter to 0x0 and it is updated to
         * SKU specific boot parameter after reading Intel_Write_Boot_Params
         * command while downloading the firmware.
         */
        boot_param = 0x00000000;

        calltime = ktime_get();

        /* Read the Intel version information to determine if the device
         * is in bootloader mode or if it already has operational firmware
         * loaded.
         */
        err = btintel_read_version(hdev, &ver);
        if (err) {
                bt_dev_err(hdev, "Intel Read version failed (%d)", err);
                btintel_reset_to_bootloader(hdev);
                return err;
        }

        err = btusb_intel_download_firmware(hdev, &ver, &params);
        if (err)
                return err;

        /* controller is already having an operational firmware */
        if (ver.fw_variant == 0x23)
                goto finish;

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

        bt_dev_info(hdev, "Firmware loaded in %llu usecs", duration);

        calltime = ktime_get();

        set_bit(BTUSB_BOOTING, &data->flags);

        err = btintel_send_intel_reset(hdev, boot_param);
        if (err) {
                bt_dev_err(hdev, "Intel Soft Reset failed (%d)", err);
                btintel_reset_to_bootloader(hdev);
                return err;
        }

        /* The bootloader will not indicate when the device is ready. This
         * is done by the operational firmware sending bootup notification.
         *
         * Booting into operational firmware should not take longer than
         * 1 second. However if that happens, then just fail the setup
         * since something went wrong.
         */
        bt_dev_info(hdev, "Waiting for device to boot");

        err = wait_on_bit_timeout(&data->flags, BTUSB_BOOTING,
                                  TASK_INTERRUPTIBLE,
                                  msecs_to_jiffies(1000));

        if (err == -EINTR) {
                bt_dev_err(hdev, "Device boot interrupted");
                return -EINTR;
        }

        if (err) {
                bt_dev_err(hdev, "Device boot timeout");
                btintel_reset_to_bootloader(hdev);
                return -ETIMEDOUT;
        }

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

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

        clear_bit(BTUSB_BOOTLOADER, &data->flags);

        err = btusb_setup_intel_new_get_fw_name(&ver, &params, ddcname,
                                                sizeof(ddcname), "ddc");

        if (!err) {
                bt_dev_err(hdev, "Unsupported Intel firmware naming");
        } else {
                /* Once the device is running in operational mode, it needs to
                 * apply the device configuration (DDC) parameters.
                 *
                 * The device can work without DDC parameters, so even if it
                 * fails to load the file, no need to fail the setup.
                 */
                btintel_load_ddc_config(hdev, ddcname);
        }

        /* Read the Intel supported features and if new exception formats
         * supported, need to load the additional DDC config to enable.
         */
        btintel_read_debug_features(hdev, &features);

        /* Set DDC mask for available debug features */
        btintel_set_debug_features(hdev, &features);

        /* Read the Intel version information after loading the FW  */
        err = btintel_read_version(hdev, &ver);
        if (err)
                return err;

        btintel_version_info(hdev, &ver);

finish:
        /* All Intel controllers that support the Microsoft vendor
         * extension are using 0xFC1E for VsMsftOpCode.
         */
        switch (ver.hw_variant) {
        case 0x12:      /* ThP */
                hci_set_msft_opcode(hdev, 0xFC1E);
                break;
        }

        /* Set the event mask for Intel specific vendor events. This enables
         * a few extra events that are useful during general operation. It
         * does not enable any debugging related events.
         *
         * The device will function correctly without these events enabled
         * and thus no need to fail the setup.
         */
        btintel_set_event_mask(hdev, false);

        return 0;
}

static int btusb_shutdown_intel(struct hci_dev *hdev)
{
        struct sk_buff *skb;
        long ret;

        /* In the shutdown sequence where Bluetooth is turned off followed
         * by WiFi being turned off, turning WiFi back on causes issue with
         * the RF calibration.
         *
         * To ensure that any RF activity has been stopped, issue HCI Reset
         * command to clear all ongoing activity including advertising,
         * scanning etc.
         */
        skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                ret = PTR_ERR(skb);
                bt_dev_err(hdev, "HCI reset during shutdown failed");
                return ret;
        }
        kfree_skb(skb);

        /* Some platforms have an issue with BT LED when the interface is
         * down or BT radio is turned off, which takes 5 seconds to BT LED
         * goes off. This command turns off the BT LED immediately.
         */
        skb = __hci_cmd_sync(hdev, 0xfc3f, 0, NULL, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                ret = PTR_ERR(skb);
                bt_dev_err(hdev, "turning off Intel device LED failed");
                return ret;
        }
        kfree_skb(skb);

        return 0;
}

static int btusb_shutdown_intel_new(struct hci_dev *hdev)
{
        struct sk_buff *skb;

        /* Send HCI Reset to the controller to stop any BT activity which
         * were triggered. This will help to save power and maintain the
         * sync b/w Host and controller
         */
        skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                bt_dev_err(hdev, "HCI reset during shutdown failed");
                return PTR_ERR(skb);
        }
        kfree_skb(skb);

        return 0;
}

#define FIRMWARE_MT7663         "mediatek/mt7663pr2h.bin"
#define FIRMWARE_MT7668         "mediatek/mt7668pr2h.bin"

#define HCI_WMT_MAX_EVENT_SIZE          64

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_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[256];
} __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;
};

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++;
                        goto err_out;
                }

                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)
                                goto err_out;
                }

                err = hci_recv_frame(hdev, skb);
                if (err < 0)
                        goto err_free_skb;

                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);
                }
err_out:
                return;
err_free_skb:
                kfree_skb(data->evt_skb);
                data->evt_skb = NULL;
                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(100);

        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);
                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;

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

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

        hdr = (struct btmtk_wmt_hdr *)&wc;
        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);
                return err;
        }

        /* 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);
                return err;
        }

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

        /* 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;
        }

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

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

        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);
                return err;
        }

        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 deivice 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_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 *id)
{
        return btusb_mtk_reg_read(data, 0x80000008, 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;
        u8 param;

        calltime = ktime_get();

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

        switch (dev_id) {
        case 0x7663:
                fwname = FIRMWARE_MT7663;
                break;
        case 0x7668:
                fwname = FIRMWARE_MT7668;
                break;
        default:
                bt_dev_err(hdev, "Unsupported support 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);

        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;
}

MODULE_FIRMWARE(FIRMWARE_MT7663);
MODULE_FIRMWARE(FIRMWARE_MT7668);

#ifdef CONFIG_PM
/* Configure an out-of-band gpio as wake-up pin, if specified in device tree */
static int marvell_config_oob_wake(struct hci_dev *hdev)
{
        struct sk_buff *skb;
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct device *dev = &data->udev->dev;
        u16 pin, gap, opcode;
        int ret;
        u8 cmd[5];

        /* Move on if no wakeup pin specified */
        if (of_property_read_u16(dev->of_node, "marvell,wakeup-pin", &pin) ||
            of_property_read_u16(dev->of_node, "marvell,wakeup-gap-ms", &gap))
                return 0;

        /* Vendor specific command to configure a GPIO as wake-up pin */
        opcode = hci_opcode_pack(0x3F, 0x59);
        cmd[0] = opcode & 0xFF;
        cmd[1] = opcode >> 8;
        cmd[2] = 2; /* length of parameters that follow */
        cmd[3] = pin;
        cmd[4] = gap; /* time in ms, for which wakeup pin should be asserted */

        skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
        if (!skb) {
                bt_dev_err(hdev, "%s: No memory\n", __func__);
                return -ENOMEM;
        }

        skb_put_data(skb, cmd, sizeof(cmd));
        hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;

        ret = btusb_send_frame(hdev, skb);
        if (ret) {
                bt_dev_err(hdev, "%s: configuration failed\n", __func__);
                kfree_skb(skb);
                return ret;
        }

        return 0;
}
#endif

static int btusb_set_bdaddr_marvell(struct hci_dev *hdev,
                                    const bdaddr_t *bdaddr)
{
        struct sk_buff *skb;
        u8 buf[8];
        long ret;

        buf[0] = 0xfe;
        buf[1] = sizeof(bdaddr_t);
        memcpy(buf + 2, bdaddr, sizeof(bdaddr_t));

        skb = __hci_cmd_sync(hdev, 0xfc22, sizeof(buf), buf, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                ret = PTR_ERR(skb);
                bt_dev_err(hdev, "changing Marvell device address failed (%ld)",
                           ret);
                return ret;
        }
        kfree_skb(skb);

        return 0;
}

static int btusb_set_bdaddr_ath3012(struct hci_dev *hdev,
                                    const bdaddr_t *bdaddr)
{
        struct sk_buff *skb;
        u8 buf[10];
        long ret;

        buf[0] = 0x01;
        buf[1] = 0x01;
        buf[2] = 0x00;
        buf[3] = sizeof(bdaddr_t);
        memcpy(buf + 4, bdaddr, sizeof(bdaddr_t));

        skb = __hci_cmd_sync(hdev, 0xfc0b, sizeof(buf), buf, HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                ret = PTR_ERR(skb);
                bt_dev_err(hdev, "Change address command failed (%ld)", ret);
                return ret;
        }
        kfree_skb(skb);

        return 0;
}

#define QCA_DFU_PACKET_LEN      4096

#define QCA_GET_TARGET_VERSION  0x09
#define QCA_CHECK_STATUS        0x05
#define QCA_DFU_DOWNLOAD        0x01

#define QCA_SYSCFG_UPDATED      0x40
#define QCA_PATCH_UPDATED       0x80
#define QCA_DFU_TIMEOUT         3000

struct qca_version {
        __le32  rom_version;
        __le32  patch_version;
        __le32  ram_version;
        __le32  ref_clock;
        __u8    reserved[4];
} __packed;

struct qca_rampatch_version {
        __le16  rom_version;
        __le16  patch_version;
} __packed;

struct qca_device_info {
        u32     rom_version;
        u8      rampatch_hdr;   /* length of header in rampatch */
        u8      nvm_hdr;        /* length of header in NVM */
        u8      ver_offset;     /* offset of version structure in rampatch */
};

static const struct qca_device_info qca_devices_table[] = {
        { 0x00000100, 20, 4, 10 }, /* Rome 1.0 */
        { 0x00000101, 20, 4, 10 }, /* Rome 1.1 */
        { 0x00000200, 28, 4, 18 }, /* Rome 2.0 */
        { 0x00000201, 28, 4, 18 }, /* Rome 2.1 */
        { 0x00000300, 28, 4, 18 }, /* Rome 3.0 */
        { 0x00000302, 28, 4, 18 }, /* Rome 3.2 */
};

static int btusb_qca_send_vendor_req(struct usb_device *udev, u8 request,
                                     void *data, u16 size)
{
        int pipe, err;
        u8 *buf;

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

        /* Found some of USB hosts have IOT issues with ours so that we should
         * not wait until HCI layer is ready.
         */
        pipe = usb_rcvctrlpipe(udev, 0);
        err = usb_control_msg(udev, pipe, request, USB_TYPE_VENDOR | USB_DIR_IN,
                              0, 0, buf, size, USB_CTRL_SET_TIMEOUT);
        if (err < 0) {
                dev_err(&udev->dev, "Failed to access otp area (%d)", err);
                goto done;
        }

        memcpy(data, buf, size);

done:
        kfree(buf);

        return err;
}

static int btusb_setup_qca_download_fw(struct hci_dev *hdev,
                                       const struct firmware *firmware,
                                       size_t hdr_size)
{
        struct btusb_data *btdata = hci_get_drvdata(hdev);
        struct usb_device *udev = btdata->udev;
        size_t count, size, sent = 0;
        int pipe, len, err;
        u8 *buf;

        buf = kmalloc(QCA_DFU_PACKET_LEN, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        count = firmware->size;

        size = min_t(size_t, count, hdr_size);
        memcpy(buf, firmware->data, size);

        /* USB patches should go down to controller through USB path
         * because binary format fits to go down through USB channel.
         * USB control path is for patching headers and USB bulk is for
         * patch body.
         */
        pipe = usb_sndctrlpipe(udev, 0);
        err = usb_control_msg(udev, pipe, QCA_DFU_DOWNLOAD, USB_TYPE_VENDOR,
                              0, 0, buf, size, USB_CTRL_SET_TIMEOUT);
        if (err < 0) {
                bt_dev_err(hdev, "Failed to send headers (%d)", err);
                goto done;
        }

        sent += size;
        count -= size;

        while (count) {
                size = min_t(size_t, count, QCA_DFU_PACKET_LEN);

                memcpy(buf, firmware->data + sent, size);

                pipe = usb_sndbulkpipe(udev, 0x02);
                err = usb_bulk_msg(udev, pipe, buf, size, &len,
                                   QCA_DFU_TIMEOUT);
                if (err < 0) {
                        bt_dev_err(hdev, "Failed to send body at %zd of %zd (%d)",
                                   sent, firmware->size, err);
                        break;
                }

                if (size != len) {
                        bt_dev_err(hdev, "Failed to get bulk buffer");
                        err = -EILSEQ;
                        break;
                }

                sent  += size;
                count -= size;
        }

done:
        kfree(buf);
        return err;
}

static int btusb_setup_qca_load_rampatch(struct hci_dev *hdev,
                                         struct qca_version *ver,
                                         const struct qca_device_info *info)
{
        struct qca_rampatch_version *rver;
        const struct firmware *fw;
        u32 ver_rom, ver_patch;
        u16 rver_rom, rver_patch;
        char fwname[64];
        int err;

        ver_rom = le32_to_cpu(ver->rom_version);
        ver_patch = le32_to_cpu(ver->patch_version);

        snprintf(fwname, sizeof(fwname), "qca/rampatch_usb_%08x.bin", ver_rom);

        err = request_firmware(&fw, fwname, &hdev->dev);
        if (err) {
                bt_dev_err(hdev, "failed to request rampatch file: %s (%d)",
                           fwname, err);
                return err;
        }

        bt_dev_info(hdev, "using rampatch file: %s", fwname);

        rver = (struct qca_rampatch_version *)(fw->data + info->ver_offset);
        rver_rom = le16_to_cpu(rver->rom_version);
        rver_patch = le16_to_cpu(rver->patch_version);

        bt_dev_info(hdev, "QCA: patch rome 0x%x build 0x%x, "
                    "firmware rome 0x%x build 0x%x",
                    rver_rom, rver_patch, ver_rom, ver_patch);

        if (rver_rom != ver_rom || rver_patch <= ver_patch) {
                bt_dev_err(hdev, "rampatch file version did not match with firmware");
                err = -EINVAL;
                goto done;
        }

        err = btusb_setup_qca_download_fw(hdev, fw, info->rampatch_hdr);

done:
        release_firmware(fw);

        return err;
}

static int btusb_setup_qca_load_nvm(struct hci_dev *hdev,
                                    struct qca_version *ver,
                                    const struct qca_device_info *info)
{
        const struct firmware *fw;
        char fwname[64];
        int err;

        snprintf(fwname, sizeof(fwname), "qca/nvm_usb_%08x.bin",
                 le32_to_cpu(ver->rom_version));

        err = request_firmware(&fw, fwname, &hdev->dev);
        if (err) {
                bt_dev_err(hdev, "failed to request NVM file: %s (%d)",
                           fwname, err);
                return err;
        }

        bt_dev_info(hdev, "using NVM file: %s", fwname);

        err = btusb_setup_qca_download_fw(hdev, fw, info->nvm_hdr);

        release_firmware(fw);

        return err;
}

/* identify the ROM version and check whether patches are needed */
static bool btusb_qca_need_patch(struct usb_device *udev)
{
        struct qca_version ver;

        if (btusb_qca_send_vendor_req(udev, QCA_GET_TARGET_VERSION, &ver,
                                      sizeof(ver)) < 0)
                return false;
        /* only low ROM versions need patches */
        return !(le32_to_cpu(ver.rom_version) & ~0xffffU);
}

static int btusb_setup_qca(struct hci_dev *hdev)
{
        struct btusb_data *btdata = hci_get_drvdata(hdev);
        struct usb_device *udev = btdata->udev;
        const struct qca_device_info *info = NULL;
        struct qca_version ver;
        u32 ver_rom;
        u8 status;
        int i, err;

        err = btusb_qca_send_vendor_req(udev, QCA_GET_TARGET_VERSION, &ver,
                                        sizeof(ver));
        if (err < 0)
                return err;

        ver_rom = le32_to_cpu(ver.rom_version);
        /* Don't care about high ROM versions */
        if (ver_rom & ~0xffffU)
                return 0;

        for (i = 0; i < ARRAY_SIZE(qca_devices_table); i++) {
                if (ver_rom == qca_devices_table[i].rom_version)
                        info = &qca_devices_table[i];
        }
        if (!info) {
                bt_dev_err(hdev, "don't support firmware rome 0x%x", ver_rom);
                return -ENODEV;
        }

        err = btusb_qca_send_vendor_req(udev, QCA_CHECK_STATUS, &status,
                                        sizeof(status));
        if (err < 0)
                return err;

        if (!(status & QCA_PATCH_UPDATED)) {
                err = btusb_setup_qca_load_rampatch(hdev, &ver, info);
                if (err < 0)
                        return err;
        }

        if (!(status & QCA_SYSCFG_UPDATED)) {
                err = btusb_setup_qca_load_nvm(hdev, &ver, info);
                if (err < 0)
                        return err;
        }

        return 0;
}

static inline int __set_diag_interface(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct usb_interface *intf = data->diag;
        int i;

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

        data->diag_tx_ep = NULL;
        data->diag_rx_ep = NULL;

        for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
                struct usb_endpoint_descriptor *ep_desc;

                ep_desc = &intf->cur_altsetting->endpoint[i].desc;

                if (!data->diag_tx_ep && usb_endpoint_is_bulk_out(ep_desc)) {
                        data->diag_tx_ep = ep_desc;
                        continue;
                }

                if (!data->diag_rx_ep && usb_endpoint_is_bulk_in(ep_desc)) {
                        data->diag_rx_ep = ep_desc;
                        continue;
                }
        }

        if (!data->diag_tx_ep || !data->diag_rx_ep) {
                bt_dev_err(hdev, "invalid diagnostic descriptors");
                return -ENODEV;
        }

        return 0;
}

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

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

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

        skb = bt_skb_alloc(2, GFP_KERNEL);
        if (!skb) {
                usb_free_urb(urb);
                return ERR_PTR(-ENOMEM);
        }

        skb_put_u8(skb, 0xf0);
        skb_put_u8(skb, enable);

        pipe = usb_sndbulkpipe(data->udev, data->diag_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 int btusb_bcm_set_diag(struct hci_dev *hdev, bool enable)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct urb *urb;

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

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

        urb = alloc_diag_urb(hdev, enable);
        if (IS_ERR(urb))
                return PTR_ERR(urb);

        return submit_or_queue_tx_urb(hdev, urb);
}

#ifdef CONFIG_PM
static irqreturn_t btusb_oob_wake_handler(int irq, void *priv)
{
        struct btusb_data *data = priv;

        pm_wakeup_event(&data->udev->dev, 0);
        pm_system_wakeup();

        /* Disable only if not already disabled (keep it balanced) */
        if (test_and_clear_bit(BTUSB_OOB_WAKE_ENABLED, &data->flags)) {
                disable_irq_nosync(irq);
                disable_irq_wake(irq);
        }
        return IRQ_HANDLED;
}

static const struct of_device_id btusb_match_table[] = {
        { .compatible = "usb1286,204e" },
        { .compatible = "usbcf3,e300" }, /* QCA6174A */
        { .compatible = "usb4ca,301a" }, /* QCA6174A (Lite-On) */
        { }
};
MODULE_DEVICE_TABLE(of, btusb_match_table);

/* Use an oob wakeup pin? */
static int btusb_config_oob_wake(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);
        struct device *dev = &data->udev->dev;
        int irq, ret;

        clear_bit(BTUSB_OOB_WAKE_ENABLED, &data->flags);

        if (!of_match_device(btusb_match_table, dev))
                return 0;

        /* Move on if no IRQ specified */
        irq = of_irq_get_byname(dev->of_node, "wakeup");
        if (irq <= 0) {
                bt_dev_dbg(hdev, "%s: no OOB Wakeup IRQ in DT", __func__);
                return 0;
        }

        irq_set_status_flags(irq, IRQ_NOAUTOEN);
        ret = devm_request_irq(&hdev->dev, irq, btusb_oob_wake_handler,
                               0, "OOB Wake-on-BT", data);
        if (ret) {
                bt_dev_err(hdev, "%s: IRQ request failed", __func__);
                return ret;
        }

        ret = device_init_wakeup(dev, true);
        if (ret) {
                bt_dev_err(hdev, "%s: failed to init_wakeup", __func__);
                return ret;
        }

        data->oob_wake_irq = irq;
        bt_dev_info(hdev, "OOB Wake-on-BT configured at IRQ %u", irq);
        return 0;
}
#endif

static void btusb_check_needs_reset_resume(struct usb_interface *intf)
{
        if (dmi_check_system(btusb_needs_reset_resume_table))
                interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
}

static bool btusb_prevent_wake(struct hci_dev *hdev)
{
        struct btusb_data *data = hci_get_drvdata(hdev);

        if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
                return true;

        return !device_may_wakeup(&data->udev->dev);
}

static int btusb_probe(struct usb_interface *intf,
                       const struct usb_device_id *id)
{
        struct usb_endpoint_descriptor *ep_desc;
        struct gpio_desc *reset_gpio;
        struct btusb_data *data;
        struct hci_dev *hdev;
        unsigned ifnum_base;
        int i, err;

        BT_DBG("intf %p id %p", intf, id);

        /* interface numbers are hardcoded in the spec */
        if (intf->cur_altsetting->desc.bInterfaceNumber != 0) {
                if (!(id->driver_info & BTUSB_IFNUM_2))
                        return -ENODEV;
                if (intf->cur_altsetting->desc.bInterfaceNumber != 2)
                        return -ENODEV;
        }

        ifnum_base = intf->cur_altsetting->desc.bInterfaceNumber;

        if (!id->driver_info) {
                const struct usb_device_id *match;

                match = usb_match_id(intf, blacklist_table);
                if (match)
                        id = match;
        }

        if (id->driver_info == BTUSB_IGNORE)
                return -ENODEV;

        if (id->driver_info & BTUSB_ATH3012) {
                struct usb_device *udev = interface_to_usbdev(intf);

                /* Old firmware would otherwise let ath3k driver load
                 * patch and sysconfig files
                 */
                if (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x0001 &&
                    !btusb_qca_need_patch(udev))
                        return -ENODEV;
        }

        data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
                ep_desc = &intf->cur_altsetting->endpoint[i].desc;

                if (!data->intr_ep && usb_endpoint_is_int_in(ep_desc)) {
                        data->intr_ep = ep_desc;
                        continue;
                }

                if (!data->bulk_tx_ep && usb_endpoint_is_bulk_out(ep_desc)) {
                        data->bulk_tx_ep = ep_desc;
                        continue;
                }

                if (!data->bulk_rx_ep && usb_endpoint_is_bulk_in(ep_desc)) {
                        data->bulk_rx_ep = ep_desc;
                        continue;
                }
        }

        if (!data->intr_ep || !data->bulk_tx_ep || !data->bulk_rx_ep)
                return -ENODEV;

        if (id->driver_info & BTUSB_AMP) {
                data->cmdreq_type = USB_TYPE_CLASS | 0x01;
                data->cmdreq = 0x2b;
        } else {
                data->cmdreq_type = USB_TYPE_CLASS;
                data->cmdreq = 0x00;
        }

        data->udev = interface_to_usbdev(intf);
        data->intf = intf;

        INIT_WORK(&data->work, btusb_work);
        INIT_WORK(&data->waker, btusb_waker);
        init_usb_anchor(&data->deferred);
        init_usb_anchor(&data->tx_anchor);
        spin_lock_init(&data->txlock);

        init_usb_anchor(&data->intr_anchor);
        init_usb_anchor(&data->bulk_anchor);
        init_usb_anchor(&data->isoc_anchor);
        init_usb_anchor(&data->diag_anchor);
        init_usb_anchor(&data->ctrl_anchor);
        spin_lock_init(&data->rxlock);

        if (id->driver_info & BTUSB_INTEL_NEW) {
                data->recv_event = btusb_recv_event_intel;
                data->recv_bulk = btusb_recv_bulk_intel;
                set_bit(BTUSB_BOOTLOADER, &data->flags);
        } else {
                data->recv_event = hci_recv_frame;
                data->recv_bulk = btusb_recv_bulk;
        }

        hdev = hci_alloc_dev();
        if (!hdev)
                return -ENOMEM;

        hdev->bus = HCI_USB;
        hci_set_drvdata(hdev, data);

        if (id->driver_info & BTUSB_AMP)
                hdev->dev_type = HCI_AMP;
        else
                hdev->dev_type = HCI_PRIMARY;

        data->hdev = hdev;

        SET_HCIDEV_DEV(hdev, &intf->dev);

        reset_gpio = gpiod_get_optional(&data->udev->dev, "reset",
                                        GPIOD_OUT_LOW);
        if (IS_ERR(reset_gpio)) {
                err = PTR_ERR(reset_gpio);
                goto out_free_dev;
        } else if (reset_gpio) {
                data->reset_gpio = reset_gpio;
        }

        hdev->open   = btusb_open;
        hdev->close  = btusb_close;
        hdev->flush  = btusb_flush;
        hdev->send   = btusb_send_frame;
        hdev->notify = btusb_notify;
        hdev->prevent_wake = btusb_prevent_wake;

#ifdef CONFIG_PM
        err = btusb_config_oob_wake(hdev);
        if (err)
                goto out_free_dev;

        /* Marvell devices may need a specific chip configuration */
        if (id->driver_info & BTUSB_MARVELL && data->oob_wake_irq) {
                err = marvell_config_oob_wake(hdev);
                if (err)
                        goto out_free_dev;
        }
#endif
        if (id->driver_info & BTUSB_CW6622)
                set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks);

        if (id->driver_info & BTUSB_BCM2045)
                set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks);

        if (id->driver_info & BTUSB_BCM92035)
                hdev->setup = btusb_setup_bcm92035;

        if (IS_ENABLED(CONFIG_BT_HCIBTUSB_BCM) &&
            (id->driver_info & BTUSB_BCM_PATCHRAM)) {
                hdev->manufacturer = 15;
                hdev->setup = btbcm_setup_patchram;
                hdev->set_diag = btusb_bcm_set_diag;
                hdev->set_bdaddr = btbcm_set_bdaddr;

                /* Broadcom LM_DIAG Interface numbers are hardcoded */
                data->diag = usb_ifnum_to_if(data->udev, ifnum_base + 2);
        }

        if (IS_ENABLED(CONFIG_BT_HCIBTUSB_BCM) &&
            (id->driver_info & BTUSB_BCM_APPLE)) {
                hdev->manufacturer = 15;
                hdev->setup = btbcm_setup_apple;
                hdev->set_diag = btusb_bcm_set_diag;

                /* Broadcom LM_DIAG Interface numbers are hardcoded */
                data->diag = usb_ifnum_to_if(data->udev, ifnum_base + 2);