USB descriptors

[DJm00n]

Some dumps of SP Blank RT Family device mode (VID:1fc9 PID:0135) used for firmware update (second stage after you press the option, assistant, A, and Y buttons):

DEVICE DESCRIPTOR
    bLength: 18
    bDescriptorType: 0x01 (DEVICE)
    bcdUSB: 0x0200
    bDeviceClass: Device (0x00)
    bDeviceSubClass: 0
    bDeviceProtocol: 0 (Use class code info from Interface Descriptors)
    bMaxPacketSize0: 64
    idVendor: NXP Semiconductors (0x1fc9)
    idProduct: Unknown (0x0135)
    bcdDevice: 0x0101
    iManufacturer: 1
    iProduct: 2
    iSerialNumber: 0
    bNumConfigurations: 1
CONFIGURATION DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x02 (CONFIGURATION)
    wTotalLength: 34
    bNumInterfaces: 1
    bConfigurationValue: 1
    iConfiguration: 0
    Configuration bmAttributes: 0xc0  SELF-POWERED  NO REMOTE-WAKEUP
    bMaxPower: 50  (100mA)
INTERFACE DESCRIPTOR (0.0): class HID
    bLength: 9
    bDescriptorType: 0x04 (INTERFACE)
    bInterfaceNumber: 0
    bAlternateSetting: 0
    bNumEndpoints: 1
    bInterfaceClass: HID (0x03)
    bInterfaceSubClass: No Subclass (0x00)
    bInterfaceProtocol: 0x00
    iInterface: 0
HID DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x21 (HID)
    bcdHID: 0x0100
    bCountryCode: Not Supported (0x00)
    bNumDescriptors: 1
    bDescriptorType: HID Report (0x22)
    wDescriptorLength: 76
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x81  IN  Endpoint:1
    bmAttributes: 0x03
    wMaxPacketSize: 64
    bInterval: 4
STRING DESCRIPTOR
    bLength: 40
    bDescriptorType: 0x03 (STRING)
    bString: SP Blank RT Family 

HID Report descriptor:

0x06, 0x00, 0xFF,  // Usage Page (Vendor Defined 0xFF00)
0x09, 0x01,        // Usage (0x01)
0xA1, 0x01,        // Collection (Application)
0x85, 0x01,        //   Report ID (1)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x08,        //   Report Size (8)
0x95, 0x10,        //   Report Count (16)
0x91, 0x02,        //   Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0x85, 0x02,        //   Report ID (2)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x80,        //   Report Size (-128)
0x95, 0x40,        //   Report Count (64)
0x91, 0x02,        //   Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0x85, 0x03,        //   Report ID (3)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x08,        //   Report Size (8)
0x95, 0x04,        //   Report Count (4)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x85, 0x04,        //   Report ID (4)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x08,        //   Report Size (8)
0x95, 0x40,        //   Report Count (64)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              // End Collection

// 76 bytes

[DJm00n]

Bootloader device mode (VID:18d1 PID:946b) - after press of option (three dots) button on the controller while you connect the controller to a computer:

DEVICE DESCRIPTOR
    bLength: 18
    bDescriptorType: 0x01 (DEVICE)
    bcdUSB: 0x0200
    bDeviceClass: Miscellaneous (0xef)
    bDeviceSubClass: 2
    bDeviceProtocol: 1 (Interface Association Descriptor)
    bMaxPacketSize0: 64
    idVendor: Google Inc. (0x18d1)
    idProduct: Unknown (0x946b)
    bcdDevice: 0x0001
    iManufacturer: 1
    iProduct: 2
    iSerialNumber: 3
    bNumConfigurations: 1
CONFIGURATION DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x02 (CONFIGURATION)
    wTotalLength: 80
    bNumInterfaces: 2
    bConfigurationValue: 1
    iConfiguration: 0
    Configuration bmAttributes: 0x80  NOT SELF-POWERED  NO REMOTE-WAKEUP
    bMaxPower: 250  (500mA)
INTERFACE ASSOCIATION DESCRIPTOR
    bLength: 8
    bDescriptorType: 0x0b (INTERFACE ASSOCIATION)
    bFirstInterface: 0
    bInterfaceCount: 1
    bFunctionClass: Vendor Specific (0xff)
    bFunctionSubClass: 0x00
    bFunctionProtocol: 0x00
    iFunction: 0
INTERFACE DESCRIPTOR (0.0): class Vendor Specific
    bLength: 9
    bDescriptorType: 0x04 (INTERFACE)
    bInterfaceNumber: 0
    bAlternateSetting: 0
    bNumEndpoints: 2
    bInterfaceClass: Vendor Specific (0xff)
    bInterfaceSubClass: 0x00
    bInterfaceProtocol: 0x00
    iInterface: 0
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x87  IN  Endpoint:7
    bmAttributes: 0x02
    wMaxPacketSize: 512
    bInterval: 0
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x07  OUT  Endpoint:7
    bmAttributes: 0x02
    wMaxPacketSize: 512
    bInterval: 0
INTERFACE ASSOCIATION DESCRIPTOR
    bLength: 8
    bDescriptorType: 0x0b (INTERFACE ASSOCIATION)
    bFirstInterface: 1
    bInterfaceCount: 1
    bFunctionClass: HID (0x03)
    bFunctionSubClass: 0x00
    bFunctionProtocol: 0x00
    iFunction: 0
INTERFACE DESCRIPTOR (1.0): class HID
    bLength: 9
    bDescriptorType: 0x04 (INTERFACE)
    bInterfaceNumber: 1
    bAlternateSetting: 0
    bNumEndpoints: 2
    bInterfaceClass: HID (0x03)
    bInterfaceSubClass: No Subclass (0x00)
    bInterfaceProtocol: 0x00
    iInterface: 0
HID DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x21 (HID)
    bcdHID: 0x0111
    bCountryCode: Not Supported (0x00)
    bNumDescriptors: 1
    bDescriptorType: HID Report (0x22)
    wDescriptorLength: 156
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x83  IN  Endpoint:3
    bmAttributes: 0x03
    wMaxPacketSize: 64
    bInterval: 6
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x03  OUT  Endpoint:3
    bmAttributes: 0x03
    wMaxPacketSize: 64
    bInterval: 6
STRING DESCRIPTOR
Descriptor Index: 0x02
    bLength: 22
    bDescriptorType: 0x03 (STRING)
    bString: Bootloader

HID Report Descriptor (looks wrong and cannot be parsed):

810600220100dc000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d01600208c910020000000000100000020450020983d8160a95e8060395b80606016002000000000395b806060160020010000007751806020160020010000005951806020160020000000000000000000000000000000003951806020160020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

[DJm00n]

Usual USB connection device mode (VID:18d1 PID:9400). Product string was changed to Stadia Controller rev. A after firmware update:

DEVICE DESCRIPTOR
    bLength: 18
    bDescriptorType: 0x01 (DEVICE)
    bcdUSB: 0x0201
    bDeviceClass: Miscellaneous (0xef)
    bDeviceSubClass: 2
    bDeviceProtocol: 1 (Interface Association Descriptor)
    bMaxPacketSize0: 64
    idVendor: Google Inc. (0x18d1)
    idProduct: Unknown (0x9400)
    bcdDevice: 0x0100
    iManufacturer: 1
    iProduct: 2
    iSerialNumber: 3
    bNumConfigurations: 1
CONFIGURATION DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x02 (CONFIGURATION)
    wTotalLength: 80
    bNumInterfaces: 2
    bConfigurationValue: 1
    iConfiguration: 0
    Configuration bmAttributes: 0x80  NOT SELF-POWERED  NO REMOTE-WAKEUP
    bMaxPower: 250  (500mA)
INTERFACE ASSOCIATION DESCRIPTOR
    bLength: 8
    bDescriptorType: 0x0b (INTERFACE ASSOCIATION)
    bFirstInterface: 0
    bInterfaceCount: 1
    bFunctionClass: Vendor Specific (0xff)
    bFunctionSubClass: 0x00
    bFunctionProtocol: 0x00
    iFunction: 0
INTERFACE DESCRIPTOR (0.0): class Vendor Specific
    bLength: 9
    bDescriptorType: 0x04 (INTERFACE)
    bInterfaceNumber: 0
    bAlternateSetting: 0
    bNumEndpoints: 2
    bInterfaceClass: Vendor Specific (0xff)
    bInterfaceSubClass: 0x00
    bInterfaceProtocol: 0x00
    iInterface: 0
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x87  IN  Endpoint:7
    bmAttributes: 0x02
    wMaxPacketSize: 512
    bInterval: 0
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x07  OUT  Endpoint:7
    bmAttributes: 0x02
    wMaxPacketSize: 512
    bInterval: 0
INTERFACE ASSOCIATION DESCRIPTOR
    bLength: 8
    bDescriptorType: 0x0b (INTERFACE ASSOCIATION)
    bFirstInterface: 1
    bInterfaceCount: 1
    bFunctionClass: HID (0x03)
    bFunctionSubClass: 0x00
    bFunctionProtocol: 0x00
    iFunction: 0
INTERFACE DESCRIPTOR (1.0): class HID
    bLength: 9
    bDescriptorType: 0x04 (INTERFACE)
    bInterfaceNumber: 1
    bAlternateSetting: 0
    bNumEndpoints: 2
    bInterfaceClass: HID (0x03)
    bInterfaceSubClass: No Subclass (0x00)
    bInterfaceProtocol: 0x00
    iInterface: 0
HID DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x21 (HID)
    bcdHID: 0x0111
    bCountryCode: Not Supported (0x00)
    bNumDescriptors: 1
    bDescriptorType: HID Report (0x22)
    wDescriptorLength: 156
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x83  IN  Endpoint:3
    bmAttributes: 0x03
    wMaxPacketSize: 64
    bInterval: 6
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x03  OUT  Endpoint:3
    bmAttributes: 0x03
    wMaxPacketSize: 64
    bInterval: 6
STRING DESCRIPTOR
Descriptor Index: 0x02
    bLength: 50
    bDescriptorType: 0x03 (STRING)
    bString: Stadia Controller rev. A
STRING DESCRIPTOR
Descriptor Index: 0x03
    bLength: 30
    bDescriptorType: 0x03 (STRING)
    bString: 9B300YCAC6WMGT

New HID Report Descriptor after firmware update (added Volume Increment/Volume Decrement and Play/Pause buttons):

0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
0x09, 0x05,        // Usage (Game Pad)
0xA1, 0x01,        // Collection (Application)
0x85, 0x03,        //   Report ID (3)
0x05, 0x01,        //   Usage Page (Generic Desktop Ctrls)
0x75, 0x04,        //   Report Size (4)
0x95, 0x01,        //   Report Count (1)
0x25, 0x07,        //   Logical Maximum (7)
0x46, 0x3B, 0x01,  //   Physical Maximum (315)
0x65, 0x14,        //   Unit (System: English Rotation, Length: Centimeter)
0x09, 0x39,        //   Usage (Hat switch)
0x81, 0x42,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,Null State)
0x45, 0x00,        //   Physical Maximum (0)
0x65, 0x00,        //   Unit (None)
0x75, 0x01,        //   Report Size (1)
0x95, 0x04,        //   Report Count (4)
0x81, 0x01,        //   Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x09,        //   Usage Page (Button)
0x15, 0x00,        //   Logical Minimum (0)
0x25, 0x01,        //   Logical Maximum (1)
0x75, 0x01,        //   Report Size (1)
0x95, 0x0F,        //   Report Count (15)
0x09, 0x12,        //   Usage (0x12)
0x09, 0x11,        //   Usage (0x11)
0x09, 0x14,        //   Usage (0x14)
0x09, 0x13,        //   Usage (0x13)
0x09, 0x0D,        //   Usage (0x0D)
0x09, 0x0C,        //   Usage (0x0C)
0x09, 0x0B,        //   Usage (0x0B)
0x09, 0x0F,        //   Usage (0x0F)
0x09, 0x0E,        //   Usage (0x0E)
0x09, 0x08,        //   Usage (0x08)
0x09, 0x07,        //   Usage (0x07)
0x09, 0x05,        //   Usage (0x05)
0x09, 0x04,        //   Usage (0x04)
0x09, 0x02,        //   Usage (0x02)
0x09, 0x01,        //   Usage (0x01)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x75, 0x01,        //   Report Size (1)
0x95, 0x01,        //   Report Count (1)
0x81, 0x01,        //   Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //   Usage Page (Generic Desktop Ctrls)
0x15, 0x01,        //   Logical Minimum (1)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x09, 0x01,        //   Usage (Pointer)
0xA1, 0x00,        //   Collection (Physical)
0x09, 0x30,        //     Usage (X)
0x09, 0x31,        //     Usage (Y)
0x75, 0x08,        //     Report Size (8)
0x95, 0x02,        //     Report Count (2)
0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x09, 0x01,        //   Usage (Pointer)
0xA1, 0x00,        //   Collection (Physical)
0x09, 0x32,        //     Usage (Z)
0x09, 0x35,        //     Usage (Rz)
0x75, 0x08,        //     Report Size (8)
0x95, 0x02,        //     Report Count (2)
0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x02,        //   Usage Page (Sim Ctrls)
0x75, 0x08,        //   Report Size (8)
0x95, 0x02,        //   Report Count (2)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x09, 0xC5,        //   Usage (Brake)
0x09, 0xC4,        //   Usage (Accelerator)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x0C,        //   Usage Page (Consumer)
0x15, 0x00,        //   Logical Minimum (0)
0x25, 0x01,        //   Logical Maximum (1)
0x09, 0xE9,        //   Usage (Volume Increment)
0x09, 0xEA,        //   Usage (Volume Decrement)
0x75, 0x01,        //   Report Size (1)
0x95, 0x02,        //   Report Count (2)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0xCD,        //   Usage (Play/Pause)
0x95, 0x01,        //   Report Count (1)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x05,        //   Report Count (5)
0x81, 0x01,        //   Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x85, 0x05,        //   Report ID (5)
0x06, 0x0F, 0x00,  //   Usage Page (PID Page)
0x09, 0x97,        //   Usage (0x97)
0x75, 0x10,        //   Report Size (16)
0x95, 0x02,        //   Report Count (2)
0x27, 0xFF, 0xFF, 0x00, 0x00,  //   Logical Maximum (65534)
0x91, 0x02,        //   Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0xC0,              // End Collection

// 182 bytes

Same report descriptor is used for Bluetooth HID over GATT connection.

[DJm00n]

USB COMPOSITE DEVICE device mode (VID:15a2 PID:0073) - after first stage of firmware update:

DEVICE DESCRIPTOR
    bLength: 18
    bDescriptorType: 0x01 (DEVICE)
    bcdUSB: 0x0200
    bDeviceClass: Device (0x00)
    bDeviceSubClass: 0
    bDeviceProtocol: 0 (Use class code info from Interface Descriptors)
    bMaxPacketSize0: 64
    idVendor: Freescale Semiconductor, Inc. (0x15a2)
    idProduct: Unknown (0x0073)
    bcdDevice: 0x0002
    iManufacturer: 1
    iProduct: 2
    iSerialNumber: 0
    bNumConfigurations: 1
CONFIGURATION DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x02 (CONFIGURATION)
    wTotalLength: 41
    bNumInterfaces: 1
    bConfigurationValue: 1
    iConfiguration: 0
    Configuration bmAttributes: 0xc0  SELF-POWERED  NO REMOTE-WAKEUP
    bMaxPower: 50  (100mA)
CONFIGURATION DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x02 (CONFIGURATION)
    wTotalLength: 41
    bNumInterfaces: 1
    bConfigurationValue: 1
    iConfiguration: 0
    Configuration bmAttributes: 0xc0  SELF-POWERED  NO REMOTE-WAKEUP
    bMaxPower: 50  (100mA)
INTERFACE DESCRIPTOR (0.0): class HID
    bLength: 9
    bDescriptorType: 0x04 (INTERFACE)
    bInterfaceNumber: 0
    bAlternateSetting: 0
    bNumEndpoints: 2
    bInterfaceClass: HID (0x03)
    bInterfaceSubClass: No Subclass (0x00)
    bInterfaceProtocol: 0x00
    iInterface: 3
HID DESCRIPTOR
    bLength: 9
    bDescriptorType: 0x21 (HID)
    bcdHID: 0x0100
    bCountryCode: Not Supported (0x00)
    bNumDescriptors: 1
    bDescriptorType: HID Report (0x22)
    wDescriptorLength: 76
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x81  IN  Endpoint:1
    bmAttributes: 0x03
    wMaxPacketSize: 1016
    bInterval: 3
ENDPOINT DESCRIPTOR
    bLength: 7
    bDescriptorType: 0x05 (ENDPOINT)
    bEndpointAddress: 0x02  OUT  Endpoint:2
    bmAttributes: 0x03
    wMaxPacketSize: 1016
    bInterval: 3
STRING DESCRIPTOR
    Descriptor Index: 0x02
    bLength: 42
    bDescriptorType: 0x03 (STRING)
    bString: USB COMPOSITE DEVICE

HID Report Descriptor:

0x06, 0x00, 0xFF,  // Usage Page (Vendor Defined 0xFF00)
0x09, 0x01,        // Usage (0x01)
0xA1, 0x01,        // Collection (Application)
0x85, 0x01,        //   Report ID (1)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x28,        //   Report Size (40)
0x95, 0xCB,        //   Report Count (-53)
0x91, 0x02,        //   Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0x85, 0x02,        //   Report ID (2)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x28,        //   Report Size (40)
0x95, 0xCB,        //   Report Count (-53)
0x91, 0x02,        //   Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0x85, 0x03,        //   Report ID (3)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x28,        //   Report Size (40)
0x95, 0xCB,        //   Report Count (-53)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x85, 0x04,        //   Report ID (4)
0x19, 0x01,        //   Usage Minimum (0x01)
0x29, 0x01,        //   Usage Maximum (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x28,        //   Report Size (40)
0x95, 0xCB,        //   Report Count (-53)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              // End Collection

// 76 bytes