feat(fater): read-only driver for the MCR-9000B (Holtek 04d9:a09f) - #157
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Requested in OpenMouse-Project/openmouse#394. The mouse is a Holtek "E-Signal" OEM design whose vendor interface declares the 8-byte feature report plus 32-byte output report that hv-ms735-config drives on the HAVIT MS735 (04d9:a100) and that the HP G360 tool uses: command byte, GET bit 7, 0xFF-minus-sum checksum. No capture of this mouse exists, so the driver only reads the polling divider and active profile, falls back to identity when the mouse does not echo, and leaves DPI (a 128-byte config page WebHID cannot read on Windows) for a capture. Writes are the same frame without the GET bit and follow once the read round-trips on hardware. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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For OpenMouse-Project/openmouse#394. App wiring: OpenMouse-Project/openmouse#498 (draft). Catalog: OpenMouse-Project/openmouse-landing-page#26.
What the mouse is
A Holtek "E-Signal" OEM design. Its vendor interface (usage page 0xFF00, usage 0xFF00) declares one 8-byte unnumbered feature report and one 32-byte output report, no input report. That is the shape of the Holtek OEM frame that hv-ms735-config drives on the HAVIT MS735 (04d9:a100; the issue's claim that it shares the PID is wrong) and that the HP G360 vendor tool uses: command byte, bit 7 = GET, byte 7 = 0xFF minus the sum of bytes 0..6, reply echoes the command with the value at offset 2.
What this adds
src/fater/index.ts: constants,faterEncodeCommand/faterEncodeGet,faterDecodeReply/faterDecodeValue, divider to Hz conversion, with tests against the byte frames hv-ms735-config puts on the wire.src/drivers/fater/hid.ts: read-onlyFaterHidClient. Reads the polling divider (0x83) and active profile (0x84); falls back to identity withvaluesVerified: falsewhen the mouse does not echo.settingsReady: false,getDpiOptions()returns[].SUPPORTED_HID_FILTERSentry per PID,"Fater"in the brand union,./fatersubpath export,docs/fater-mcr-9000b.mdwith the sources and open questions.What is deliberately missing
(byte + 1) * 100encoding anyway. Needs a USBPcap capture of the vendor app (461 MB zip, not inspected).Verification
npm run buildclean,npm test: 1977 pass, 0 fail (registry probe matrix included). Not tested on hardware; the reporter offered to test.