Unit Mouse
From Ultibo.org
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Description
Ultibo Mouse Interface unit
This unit provides both the Mouse device interface and the generic USB HID mouse driver.
Constants
Mouse specific constants
MOUSE_* MOUSE_NAME_PREFIX = 'Mouse';
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Name prefix for Mouse Devices |
Mouse device type
MOUSE_TYPE_* MOUSE_TYPE_NONE = 0;
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MOUSE_TYPE_USB = 1;
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MOUSE_TYPE_PS2 = 2;
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MOUSE_TYPE_SERIAL = 3;
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MOUSE_TYPE_MAX = 3;
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Mouse device state
MOUSE_STATE_* MOUSE_STATE_DETACHED = 0;
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MOUSE_STATE_DETACHING = 1;
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MOUSE_STATE_ATTACHING = 2;
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MOUSE_STATE_ATTACHED = 3;
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MOUSE_STATE_MAX = 3;
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Mouse device flag
MOUSE_FLAG_* MOUSE_FLAG_NONE = $00000000;
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MOUSE_FLAG_NON_BLOCK = $00000001;
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If set device reads are non blocking (Also supported in Flags parameter of MouseReadEx) |
MOUSE_FLAG_DIRECT_READ = $00000002;
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If set device writes mouse data to its local buffer and which must be read using MouseDeviceRead |
MOUSE_FLAG_SWAP_BUTTONS = $00000004;
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If set left and right mouse buttons will be swapped in mouse data |
MOUSE_FLAG_PEEK_BUFFER = $00000008;
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Peek at the buffer to see if any data is available, don't remove it. (Used only in Flags parameter of MouseReadEx) |
| Flags supported by MOUSE_CONTROL_GET/SET/CLEAR_FLAG | |
MOUSE_FLAG_MASK = MOUSE_FLAG_NON_BLOCK or MOUSE_FLAG_DIRECT_READ or MOUSE_FLAG_SWAP_BUTTONS;
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Mouse device control code
MOUSE_CONTROL_* MOUSE_CONTROL_GET_FLAG = 1;
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Get Flag |
MOUSE_CONTROL_SET_FLAG = 2;
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Set Flag |
MOUSE_CONTROL_CLEAR_FLAG = 3;
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Clear Flag |
MOUSE_CONTROL_FLUSH_BUFFER = 4;
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Flush Buffer |
MOUSE_CONTROL_GET_SAMPLE_RATE = 5;
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Get Sample Rate |
MOUSE_CONTROL_SET_SAMPLE_RATE = 6;
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Set Sample Rate |
MOUSE_CONTROL_GET_MAX_X = 7;
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Get Maximum X value (Only applies to Absolute X values) |
MOUSE_CONTROL_GET_MAX_Y = 8;
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Get Maximum Y value (Only applies to Absolute Y values) |
MOUSE_CONTROL_GET_MAX_WHEEL = 9;
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Get Maximum Wheel value (Only applies to Absolute Wheel values) |
MOUSE_CONTROL_GET_MAX_BUTTONS = 10;
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Get Maximum Buttons mask (eg MOUSE_LEFT_BUTTON or MOUSE_RIGHT_BUTTON etc) |
MOUSE_CONTROL_GET_ROTATION = 11;
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Get Rotation value (0, 90, 180, 270) (Only where supported by the driver) |
MOUSE_CONTROL_SET_ROTATION = 12;
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Set Rotation value (0, 90, 180, 270) (Only where supported by the driver) |
Mouse buffer size
MOUSE_BUFFER_* MOUSE_BUFFER_SIZE = 512;
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Mouse sampling rate
MOUSE_SAMPLE_* MOUSE_SAMPLE_RATE = 100;
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100 samples/sec |
Mouse data definition
MOUSE_LEFT_*, MOUSE_RIGHT_* | Values for TMouseData.Buttons | |
MOUSE_LEFT_BUTTON = $0001;
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The Left mouse button is pressed |
MOUSE_RIGHT_BUTTON = $0002;
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The Right mouse button is pressed |
MOUSE_MIDDLE_BUTTON = $0004;
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The Middle mouse button is pressed |
MOUSE_SIDE_BUTTON = $0008;
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The Side mouse button is pressed |
MOUSE_EXTRA_BUTTON = $0010;
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The Extra mouse button is pressed |
MOUSE_TOUCH_BUTTON = $0020;
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The Touch screen is being touched |
MOUSE_ABSOLUTE_X = $0040;
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The OffsetX value is absolute not relative |
MOUSE_ABSOLUTE_Y = $0080;
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The OffsetY value is absolute not relative |
MOUSE_ABSOLUTE_WHEEL = $0100;
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The OffsetWheel value is absolute not relative |
Mouse rotation
MOUSE_ROTATION_* MOUSE_ROTATION_0 = FRAMEBUFFER_ROTATION_0;
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No rotation |
MOUSE_ROTATION_90 = FRAMEBUFFER_ROTATION_90;
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90 degree rotation |
MOUSE_ROTATION_180 = FRAMEBUFFER_ROTATION_180;
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180 degree rotation |
MOUSE_ROTATION_270 = FRAMEBUFFER_ROTATION_270;
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270 degree rotation |
Mouse logging
MOUSE_LOG_* MOUSE_LOG_LEVEL_DEBUG = LOG_LEVEL_DEBUG;
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Mouse debugging messages |
MOUSE_LOG_LEVEL_INFO = LOG_LEVEL_INFO;
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Mouse informational messages, such as a device being attached or detached |
MOUSE_LOG_LEVEL_WARN = LOG_LEVEL_WARN;
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Mouse warning messages |
MOUSE_LOG_LEVEL_ERROR = LOG_LEVEL_ERROR;
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Mouse error messages |
MOUSE_LOG_LEVEL_NONE = LOG_LEVEL_NONE;
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No Mouse messages |
USB mouse specific constants
USBMOUSE_* USBMOUSE_DRIVER_NAME = 'USB Mouse Driver (HID boot protocol)';
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Name of USB mouse driver |
USBMOUSE_MOUSE_DESCRIPTION = 'USB HID Mouse';
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Description of USB mouse device |
| HID Interface Subclass types (See USB HID v1.11 specification) | |
USB_HID_SUBCLASS_NONE = 0;
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Section 4.2 |
USB_HID_SUBCLASS_BOOT = 1;
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Section 4.2 |
| HID Interface Protocol types (See USB HID v1.11 specification) | |
USB_HID_BOOT_PROTOCOL_NONE = 0;
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Section 4.3 |
USB_HID_BOOT_PROTOCOL_KEYBOARD = 1;
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Section 4.3 |
USB_HID_BOOT_PROTOCOL_MOUSE = 2;
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Section 4.3 |
| HID Class Descriptor Types (See USB HID v1.11 specification) | |
USB_HID_DESCRIPTOR_TYPE_HID = $21;
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Section 7.1 |
USB_HID_DESCRIPTOR_TYPE_REPORT = $22;
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Section 7.1 |
USB_HID_DESCRIPTOR_TYPE_PHYSICAL_DESCRIPTOR = $23;
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Section 7.1 |
| HID Request types | |
USB_HID_REQUEST_GET_REPORT = $01;
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USB_HID_REQUEST_GET_IDLE = $02;
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USB_HID_REQUEST_GET_PROTOCOL = $03;
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Section 7.2 |
USB_HID_REQUEST_SET_REPORT = $09;
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USB_HID_REQUEST_SET_IDLE = $0A;
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USB_HID_REQUEST_SET_PROTOCOL = $0B;
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Section 7.2 |
| HID Protocol types | |
USB_HID_PROTOCOL_BOOT = 0;
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Section 7.2.5 |
USB_HID_PROTOCOL_REPORT = 1;
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Section 7.2.5 |
| HID Report types | |
USB_HID_REPORT_INPUT = 1;
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Section 7.2.1 |
USB_HID_REPORT_OUTPUT = 2;
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Section 7.2.1 |
USB_HID_REPORT_FEATURE = 3;
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Section 7.2.1 |
| HID Report IDs | |
USB_HID_REPORTID_NONE = 0;
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Section 7.2.1 |
| HID Boot Protocol Button bits | |
USB_HID_BOOT_LEFT_BUTTON = (1 shl 0);
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USB_HID_BOOT_RIGHT_BUTTON = (1 shl 1);
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USB_HID_BOOT_MIDDLE_BUTTON = (1 shl 2);
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USB_HID_BOOT_SIDE_BUTTON = (1 shl 3);
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USB_HID_BOOT_EXTRA_BUTTON = (1 shl 4);
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| HID Boot Protocol Report data | |
USB_HID_BOOT_REPORT_SIZE = 3;
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Appendix B of HID Device Class Definition 1.11 |
USB_HID_BOOT_DATA_SIZE = 8;
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Allocate more than the minimum to allow for extra data |
Type definitions
Mouse data
PMouseData = ^TMouseData;
TMouseData = record
Buttons:Word;
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The bitmap of current button values (eg MOUSE_LEFT_BUTTON or MOUSE_RIGHT_BUTTON) |
OffsetX:SmallInt;
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The X offset of the mouse pointer (May be negative, read as absolute if Buttons includes MOUSE_ABSOLUTE_X) |
OffsetY:SmallInt;
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The Y offset of the mouse pointer (May be negative, read as absolute if Buttons includes MOUSE_ABSOLUTE_Y) |
OffsetWheel:SmallInt;
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The X offset of the mouse pointer (May be negative, read as absolute if Buttons includes MOUSE_ABSOLUTE_WHEEL) |
MaximumX:Word;
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The maximum X value of the mouse (Only applicable if Buttons includes MOUSE_ABSOLUTE_X, otherwise must be 0) |
MaximumY:Word;
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The maximum Y value of the mouse (Only applicable if Buttons includes MOUSE_ABSOLUTE_Y, otherwise must be 0) |
MaximumWheel:Word;
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The maximum Wheel value of the mouse (Only applicable if Buttons includes MOUSE_ABSOLUTE_WHEEL, otherwise must be 0) |
Reserved:Word;
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Reserved field (Round structure to 16 bytes) |
Mouse buffer
PMouseBuffer = ^TMouseBuffer;
TMouseBuffer = record
Wait:TSemaphoreHandle;
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Buffer ready semaphore |
Start:LongWord;
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Index of first buffer ready |
Count:LongWord;
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Number of entries ready in buffer |
Buffer:array[0..(MOUSE_BUFFER_SIZE - 1)] of TMouseData;
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Mouse enumeration callback
TMouseEnumerate = function(Mouse:PMouseDevice; Data:Pointer):LongWord;
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Mouse notification callback
TMouseNotification = function(Device:PDevice; Data:Pointer; Notification:LongWord):LongWord;
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Mouse device read
TMouseDeviceRead = function(Mouse:PMouseDevice; Buffer:Pointer; Size:LongWord; var Count:LongWord):LongWord;
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Mouse device control
TMouseDeviceControl = function(Mouse:PMouseDevice; Request:Integer; Argument1:LongWord; var Argument2:LongWord):LongWord;
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Mouse device types
PMouseDevice = ^TMouseDevice;
TMouseDevice = record
| Device Properties | |
Device:TDevice;
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The Device entry for this Mouse |
| Mouse Properties | |
MouseId:LongWord;
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Unique Id of this Mouse in the Mouse table |
MouseState:LongWord;
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Mouse state (eg MOUSE_STATE_ATTACHED) |
MouseRate:LongWord;
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Mouse sample rate (Samples per second) |
DeviceRead:TMouseDeviceRead;
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A Device specific DeviceRead method implementing a standard Mouse device interface (Or nil if the default method is suitable) |
DeviceControl:TMouseDeviceControl;
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A Device specific DeviceControl method implementing a standard Mouse device interface (Or nil if the default method is suitable) |
| Driver Properties | |
Lock:TMutexHandle;
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Mouse lock |
Buffer:TMouseBuffer;
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Mouse input buffer |
| Statistics Properties | |
ReceiveCount:LongWord;
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ReceiveErrors:LongWord;
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BufferOverruns:LongWord;
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| Internal Properties | |
Prev:PMouseDevice;
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Previous entry in Mouse table |
Next:PMouseDevice;
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Next entry in Mouse table |
USB HID descriptor
PUSBHIDDescriptor = ^TUSBHIDDescriptor;
TUSBHIDDescriptor = packed record
bLength:Byte;
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bDescriptorType:Byte;
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bcdHID:Word;
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bCountryCode:Byte;
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bNumDescriptors:Byte;
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bHIDDescriptorType:Byte;
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wHIDDescriptorLength:Word;
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| Note: Up to two optional bHIDDescriptorType/wHIDDescriptorLength pairs after the Report descriptor details | |
USB mouse device types
PUSBMouseDevice = ^TUSBMouseDevice;
TUSBMouseDevice = record
| Mouse Properties | |
Mouse:TMouseDevice;
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| USB Properties | |
HIDInterface:PUSBInterface;
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USB HID Mouse Interface |
ReportRequest:PUSBRequest;
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USB request for mouse report data |
ReportEndpoint:PUSBEndpointDescriptor;
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USB Mouse Interrupt IN Endpoint |
HIDDescriptor:PUSBHIDDescriptor;
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USB HID Descriptor for mouse |
ReportDescriptor:Pointer;
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USB HID Report Descriptor for mouse |
PendingCount:LongWord;
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Number of USB requests pending for this mouse |
WaiterThread:TThreadId;
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Thread waiting for pending requests to complete (for mouse detachment) |
Public variables
Mouse logging
MOUSE_DEFAULT_LOG_LEVEL:LongWord = MOUSE_LOG_LEVEL_DEBUG;
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Minimum level for Mouse messages. Only messages with level greater than or equal to this will be printed. |
MOUSE_LOG_ENABLED:Boolean;
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Function declarations
Initialization functions
procedure MouseInit;
Description: Initialize the mouse unit, device table and USB mouse driver
| Note | Called only during system startup |
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Mouse functions
function MousePeek:LongWord;
Description: Peek at the global mouse buffer to see if any data packets are ready
| Return | ERROR_SUCCESS if packets are ready, ERROR_NO_MORE_ITEMS if not or another error code on failure |
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function MouseRead(Buffer:Pointer; Size:LongWord; var Count:LongWord):LongWord; inline;
Description: Read mouse data packets from the global mouse buffer
| Buffer | Pointer to a buffer to copy the mouse data packets to |
|---|---|
| Size | The size of the buffer in bytes (Must be at least TMouseData or greater) |
| Count | The number of mouse data packets copied to the bufferm |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseReadEx(Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: Read mouse data packets from the global mouse buffer
| Buffer | Pointer to a buffer to copy the mouse data packets to |
|---|---|
| Size | The size of the buffer in bytes (Must be at least TMouseData or greater) |
| Flags | The flags for the behaviour of the read (eg MOUSE_FLAG_NON_BLOCK) |
| Count | The number of mouse data packets copied to the buffer |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseWrite(Buffer:Pointer; Size,Count:LongWord):LongWord;
Description: Write mouse data packets to the global mouse buffer
| Buffer | Pointer to a buffer to copy the mouse data packets from |
|---|---|
| Size | The size of the buffer in bytes (Must be at least TMouseData or greater) |
| Count | The number of mouse data packets to copy from the buffer |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseFlush:LongWord;
Description: Flush the contents of the global mouse buffer
| Return | ERROR_SUCCESS if completed or another error code on failure |
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function MouseDeviceRead(Mouse:PMouseDevice; Buffer:Pointer; Size:LongWord; var Count:LongWord):LongWord;
Description: Read mouse data packets from the buffer of the specified mouse
| Mouse | The mouse device to read from |
|---|---|
| Buffer | Pointer to a buffer to copy the mouse data packets to |
| Size | The size of the buffer in bytes (Must be at least TMouseData or greater) |
| Count | The number of mouse data packets copied to the buffer |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceControl(Mouse:PMouseDevice; Request:Integer; Argument1:LongWord; var Argument2:LongWord):LongWord;
Description: Perform a control request on the specified mouse device
| Mouse | The mouse device to control |
|---|---|
| Request | The request code for the operation (eg MOUSE_CONTROL_GET_FLAG) |
| Argument1 | The first argument for the operation (Dependent on request code) |
| Argument2 | The second argument for the operation (Dependent on request code) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceSetState(Mouse:PMouseDevice; State:LongWord):LongWord;
Description: Set the state of the specified mouse and send a notification
| Mouse | The mouse to set the state for |
|---|---|
| State | The new state to set and notify |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceCreate:PMouseDevice;
Description: Create a new Mouse device entry
| Return | Pointer to new Mouse device entry or nil if mouse could not be created |
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function MouseDeviceCreateEx(Size:LongWord):PMouseDevice;
Description: Create a new Mouse device entry
| Size | Size in bytes to allocate for new mouse (Including the mouse device entry) |
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| Return | Pointer to new Mouse device entry or nil if mouse could not be created |
function MouseDeviceDestroy(Mouse:PMouseDevice):LongWord;
Description: Destroy an existing Mouse device entry
| Mouse | The mouse device to destroy |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceRegister(Mouse:PMouseDevice):LongWord;
Description: Register a new Mouse device in the Mouse table
| Mouse | The mouse device to register |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceDeregister(Mouse:PMouseDevice):LongWord;
Description: Deregister a Mouse device from the Mouse table
| Mouse | The mouse device to deregister |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceFind(MouseId:LongWord):PMouseDevice;
Description: Find a mouse device by ID in the mouse table
| MouseId | The ID number of the mouse to find |
|---|---|
| Return | Pointer to mouse device entry or nil if not found |
function MouseDeviceFindByName(const Name:String):PMouseDevice; inline;
Description: Find a mouse device by name in the mouse table
| Name | The name of the mouse to find (eg Mouse0) |
|---|---|
| Return | Pointer to mouse device entry or nil if not found |
function MouseDeviceFindByDescription(const Description:String):PMouseDevice; inline;
Description: Find a mouse device by description in the mouse table
| Description | The description of the mouse to find (eg USB HID Mouse) |
|---|---|
| Return | Pointer to mouse device entry or nil if not found |
function MouseDeviceEnumerate(Callback:TMouseEnumerate; Data:Pointer):LongWord;
Description: Enumerate all mouse devices in the mouse table
| Callback | The callback function to call for each mouse in the table |
|---|---|
| Data | A private data pointer to pass to callback for each mouse in the table |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function MouseDeviceNotification(Mouse:PMouseDevice; Callback:TMouseNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: Register a notification for mouse device changes
| Mouse | The mouse device to notify changes for (Optional, pass nil for all mice) |
|---|---|
| Callback | The function to call when a notification event occurs |
| Data | A private data pointer to pass to callback when a notification event occurs |
| Notification | The events to register for notification of (eg DEVICE_NOTIFICATION_REGISTER) |
| Flags | The flags to control the notification (eg NOTIFIER_FLAG_WORKER) |
RTL console functions
function SysConsoleHideMouse(AUserData:Pointer):Boolean;
Description: Handler for Platform ConsoleHideMouse function
| Note | None documented |
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function SysConsoleShowMouse(X,Y:LongWord; AUserData:Pointer):Boolean;
Description: Handler for Platform ConsoleShowMouse function
| Note | None documented |
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function SysConsoleReadMouse(var X,Y,Buttons:LongWord; AUserData:Pointer):Boolean;
Description: Handler for Platform ConsoleReadMouse function
| Note | None documented |
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USB mouse functions
function USBMouseDeviceRead(Mouse:PMouseDevice; Buffer:Pointer; Size:LongWord; var Count:LongWord):LongWord;
Description: Implementation of MouseDeviceRead API for USB Mouse
| Note | Not intended to be called directly by applications, use MouseDeviceRead instead. |
|---|
function USBMouseDeviceControl(Mouse:PMouseDevice; Request:Integer; Argument1:LongWord; var Argument2:LongWord):LongWord;
Description: Implementation of MouseDeviceControl API for USB Mouse
| Note | Not intended to be called directly by applications, use MouseDeviceControl instead. |
|---|
function USBMouseDriverBind(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Bind the Mouse driver to a USB device if it is suitable
| Device | The USB device to attempt to bind to |
|---|---|
| Interrface | The USB interface to attempt to bind to (or nil for whole device) |
| Return | USB_STATUS_SUCCESS if completed, USB_STATUS_DEVICE_UNSUPPORTED if unsupported or another error code on failure. |
function USBMouseDriverUnbind(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Unbind the Mouse driver from a USB device
| Device | The USB device to unbind from |
|---|---|
| Interrface | The USB interface to unbind from (or nil for whole device) |
| Return | USB_STATUS_SUCCESS if completed or another error code on failure |
procedure USBMouseReportWorker(Request:PUSBRequest);
Description: Called (by a Worker thread) to process a completed USB request from a USB mouse IN interrupt endpoint
| Request | The USB request which has completed |
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procedure USBMouseReportComplete(Request:PUSBRequest);
Description: Called when a USB request from a USB mouse IN interrupt endpoint completes
| Request | The USB request which has completed |
|---|---|
| Note | Request is passed to worker thread for processing to prevent blocking the USB completion |
Mouse helper functions
function MouseGetCount:LongWord; inline;
Description: Get the current mouse count
| Note | None documented |
|---|
function MouseDeviceCheck(Mouse:PMouseDevice):PMouseDevice;
Description: Check if the supplied Mouse is in the mouse table
| Note | None documented |
|---|
function MouseDeviceTypeToString(MouseType:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
function MouseDeviceStateToString(MouseState:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
function MouseDeviceStateToNotification(State:LongWord):LongWord;
Description: Convert a Mouse state value into the notification code for device notifications
| Note | None documented |
|---|
function MouseInsertData(Mouse:PMouseDevice; Data:PMouseData; Signal:Boolean):LongWord;
Description: Insert a TMouseData entry into the mouse buffer (Direct or Global)
| Mouse | The mouse device to insert data for |
|---|---|
| Data | The TMouseData entry to insert |
| Signal | If True then signal that new data is available in the buffer |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Caller must hold the mouse lock |
procedure MouseLog(Level:LongWord; Mouse:PMouseDevice; const AText:String);
Description: To be documented
| Note | None documented |
|---|
procedure MouseLogInfo(Mouse:PMouseDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure MouseLogWarn(Mouse:PMouseDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
|---|
procedure MouseLogError(Mouse:PMouseDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
|---|
procedure MouseLogDebug(Mouse:PMouseDevice;const AText:String); inline;
Description: To be documented
| Note | None documented |
|---|
USB mouse helper functions
function USBMouseCheckDevice(Device:PUSBDevice):Boolean;
Description: Check if the supplied USB device is suitable for detection as a HID Mouse Device
| Device | The USB device to check |
|---|---|
| Return | True if the device is suitable or False if it is not |
function USBMouseDeviceSetProtocol(Mouse:PUSBMouseDevice; Protocol:Byte):LongWord;
Description: Set the report protocol for a USB mouse device
| Mouse | The USB mouse device to set the report protocol for |
|---|---|
| Protocol | The report protocol to set (eg USB_HID_PROTOCOL_BOOT) |
| Return | USB_STATUS_SUCCESS if completed or another USB error code on failure |
function USBMouseDeviceGetHIDDescriptor(Mouse:PUSBMouseDevice; Descriptor:PUSBHIDDescriptor):LongWord;
Description: Get the HID Descriptor for a USB mouse device
| Mouse | The USB mouse device to get the descriptor for |
|---|---|
| Descriptor | Pointer to a USB HID Descriptor structure for the returned data |
| Return | USB_STATUS_SUCCESS if completed or another USB error code on failure |
function USBMouseDeviceGetReportDescriptor(Mouse:PUSBMouseDevice; Descriptor:Pointer; Size:LongWord):LongWord;
Description: Get the Report Descriptor for a USB mouse device
| Mouse | The USB mouse device to get the descriptor for |
|---|---|
| Descriptor | Pointer to a buffer to return the USB Report Descriptor |
| Size | The size in bytes of the buffer pointed to by Descriptor |
| Return | USB_STATUS_SUCCESS if completed or another USB error code on failure |
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