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  • These ControlButtons represent on/off buttons whose purpose is to change the host’s configuration.
  • The InputReport field to be populated by InputDevice.GetInputReport.
  • An InputDevice driver represents a single physical input device. The InputDevice maintains an internal FIFO of MAX_DEVICE_REPORT_COUNT reports for each client that connects. Reports are removed from the FIFO once they are read by the client. If the FIFO is full, it will drop the oldest report to make room for an incoming report.
  • Each InputReportsReader has its own FIFO of InputReports that it maintains. When ReadInputReports is called it drains the InputReports FIFO. If too many InputReports are created before the FIFO is drained, then the oldest InputReport will be silently discarded.
  • An LedType represents an LED on a device that can be turned on or off. When applicable, the definition of each LED is derived from one of the following sources albeit with a Fuchsia-specific numeric value:
  • SensorReportingState determines when a sensor will send reports.
  • Each sensor value has a corresponding SensorType, which explains what the value is measuring in the world.
  • Input mode indicating which top-level collection should be used for input reporting. These values must correspond to the input modes defined in 16.7 of the HID Usage Tables for Universal Serial Bus (USB) Spec (https://usb.org/sites/default/files/hut1_22.pdf).
  • The device type from which the touch originated.
  • This provides an easy, standardized way to specify units. New units can be added as needed. Each UnitType should be named after a specific unit that should be fully distinguished by the name (E.g: Use METERS instead of DISTANCE). More complicated units that need to be differentiated should begin with SI_ (for Internation System of Units) or ENGLISH_ (for English System of Units).
  • Below are ProductIds which represents which product this Input device represents. If the Input device is a HID device, the ProductId maps directly to the HID ProductId. If the Input device is not a HID device, then the ProductId will be greater than 0xFFFF, which is the max HID ProductId.
  • The VendorId represents the vendor that created this Input device. If the Input device is a HID device, the VendorId maps directly to the HID VendorId. If the Input device is not a HID device, then the VendorId will be greater than 0xFFFF, which is the max HID VendorId.

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