devhidraw2

devhidraw2 is a device file in Linux that exposes a raw HID interface provided by the hidraw subsystem. It is typically represented on the system as /dev/hidraw2, one of several hidraw nodes created when HID devices are enumerated by the kernel. The exact numbering depends on the order in which devices are detected and the udev rules on the system.

The hidraw interface offers access to raw HID reports from USB and Bluetooth HID devices, bypassing the higher-level input event subsystem. When a device supports the hidraw interface, applications can read the raw input reports and, if supported by the device, write output reports. The data format of these reports is defined by the device’s HID report descriptor, so the bytes read from /dev/hidraw2 will need to be interpreted according to that descriptor.

Typical use cases include debugging, device development, and custom integrations where low-level HID data is required. Tools such as usbhid-dump or wireshark with HID capture support can interpret and present the data captured from /dev/hidraw2 in a readable form. Developers may open the device file directly from userspace to implement custom parsing or to send specific HID reports to a device.

Notes: the presence of /dev/hidraw2 indicates at least three hidraw devices exist on the system; however, the exact mapping between hidrawN and a physical device can vary. Access to /dev/hidraw2 generally requires appropriate permissions. The hidraw interface is complementary to the standard /dev/input event devices and is specifically designed for raw HID data handling.