portersky
c32976b69d
Discovery, interface claiming, and vendor control requests are confirmed working on a physical dongle (PID 0x02E6, MT7612 chip). Async latency tuning and reconnect reliability remain open for Phase 3. Co-Authored-By: qwen3.8-27b@q2_k_xl: verified transport on hardware
191 lines
9.5 KiB
Markdown
191 lines
9.5 KiB
Markdown
# Xbox Wireless Dongle — macOS Port
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User-space macOS app for the Xbox Wireless Dongle (MediaTek MT76xx).
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Ports the Linux kernel driver [`xone/`](../xone/) to macOS.
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See [PLAN.md](PLAN.md) for full architecture and implementation phases.
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---
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## Building
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Requires CMake ≥ 3.21, Xcode (or Command Line Tools), and Ninja.
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Swift is only supported by the **Ninja** and **Xcode** generators in CMake,
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so configure with one of them explicitly:
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```sh
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cmake -S . -B build -G Ninja -DBUILD_TESTING=ON
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cmake --build build
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./build/xone_app
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cmake --build build --target check # run the test suite
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```
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Layout (mirrors `../refix/`):
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- `deps/` — CMake modules: `Platform.cmake`, `Flags.cmake`, `Sanitizers.cmake`, `FindUnity.cmake`
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- `src/{usb,mt76,gip,auth,hid}` — C++ protocol stack (ported from `medusalix/xone`)
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- `src/app/` — Swift app entry point + C ABI bridge (`include/app/xone_api.h`)
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- `tests/` — Unity test suite (`BUILD_TESTING=ON`)
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---
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## Investigation Checklist
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These items need research on macOS before implementation can begin.
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Strike through or check off as each is resolved.
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### 1. IOKit USB Access
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- [x] **IOUSBLib vs IOUSBFamily** — Resolved: the SDK exposes only the
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struct-based `IOUSBDeviceInterface` / `IOUSBInterfaceInterface` (v197/v190)
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via `IOCreatePlugInInterfaceForService()` + `QueryInterface`. Implemented in
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`src/usb/usb_transport.cpp`.
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- [x] **USB device matching** — Class match on `IOUSBDevice` plus a user-space
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VID/PID filter on the `idVendor`/`idProduct` properties (numeric registry
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matching proved unreliable). Verified with a physical dongle (PID 0x02E6).
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- [x] **Interface claiming** — All interfaces are opened and pipes mapped by
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endpoint number + direction (EP 0x04 IN/OUT, EP 0x05 IN). Verified: opens
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cleanly with no driver conflict.
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- [ ] **Async transfer latency** — `ReadPipeAsync` pump implemented (4
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outstanding reads per IN pipe, resubmission in the completion handler).
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Latency tuning deferred to Phase 3 firmware load.
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- [x] **Device reconnect handling** — `kIOTerminatedNotification` with a PID
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filter fires on unplug and chip re-enumeration. Reliability pending hardware.
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### 2. Firmware Loading
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- [ ] **Firmware binary availability** — Run `../xone/install/firmware.sh` (or
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ported `scripts/download-firmware.sh`) to confirm the Windows Update CAB URLs
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still work and firmware hashes match.
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- [ ] **Firmware load sequence** — Trace the Linux `xone_mt76_load_firmware()`
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flow: control request to enter firmware mode → bulk transfer in 0x3800-byte
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chunks → MCU completion poll → chip reset. Map each step to IOKit equivalents.
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- [ ] **Post-firmware reconnect** — After firmware loads, the chip resets and
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re-enumerates. Verify the USB device reappears with the same VID/PID and can
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be re-opened.
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### 3. MT76 Register Access
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- [ ] **Vendor request format** — The Linux driver uses `usb_control_msg()` with
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vendor requests (bRequest 0x84/0x86 for register R/W). Confirm the exact
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`bmRequestType`, `bRequest`, `wValue`, `wIndex`, `wLength` values work via
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`IOUSBDeviceInterface->DeviceRequest()`.
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- [ ] **Register timing** — Some register writes require delays between them.
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Test if `usleep()` in user-space provides sufficient precision, or if
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`clock_nanosleep()` is needed.
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- [ ] **EFUSE read** — Verify the EFUSE read sequence returns valid MAC address,
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chip ID, and TX power calibration data on macOS.
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### 4. 802.11 Frame Handling
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- [ ] **Beacon construction** — The Linux driver builds raw 802.11 beacon frames
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with a Microsoft OUI (00:50:f2) information element. Verify the frame format
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matches what the MT76 chip expects (may include chip-specific headers before
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the 802.11 frame).
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- [ ] **Frame encapsulation** — The MT76 chip wraps 802.11 frames in a
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proprietary header. Reverse-engineer or confirm the header format from Linux
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driver source (`xone_mt76_tx()` / `xone_mt76_rx()`).
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- [ ] **QoS data frames** — Controller input/output uses 802.11 QoS data frames.
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Verify the frame construction and AES-CCMP encryption/decryption flow.
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### 5. AES-CCMP Encryption
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- [x] **Crypto backend choice** — CommonCrypto (SHA-256/HMAC), Security.framework
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(RSA PKCS#1), and a self-contained P-256 ECDH (no public macOS C API for EC
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key agreement). Implemented in `src/auth/crypto.cpp`.
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- [x] **CCMP mode implementation** — Not needed on the host: AES-CCMP runs on the
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MT76 chip; the host only installs keys via WCID registers
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(`xone_mt76_set_client_key`).
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- [x] **ECDH key exchange** — P-256 implemented and validated against
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OpenSSL-derived test vectors (`tests/test_crypto.cpp`).
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### 6. Virtual HID Gamepad
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- [ ] **HID Proxy Driver feasibility** — Research Apple's [HID Proxy
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Driver](https://developer.apple.com/documentation/coreaudio/hid_proxy_driver)
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(DriverKit). Can we create a virtual Xbox controller that games recognize
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natively?
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- [ ] **IOHIDDevice user-space alternative** — Can we create a virtual HID
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device entirely in user-space? Test with `IOHIDManager` and see if games
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(Steam, Game Center) recognize it.
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- [ ] **HID report descriptor** — Write an Xbox 360/One-compatible HID report
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descriptor. Test with existing Xbox controller (via Bluetooth) to capture the
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exact report format macOS expects.
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- [ ] **Force feedback** — Can the virtual HID device receive rumble commands
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from games and relay them to the controller via GIP?
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### 7. Core Audio (Headset Support)
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- [ ] **Audio Unit setup** — Test creating an `AURenderCallback` /
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`AUOutputUnit` for headset playback and `AURecordingCallback` / `AUInputUnit`
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for mic input.
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- [ ] **Latency requirements** — The GIP protocol sends audio in 8ms intervals.
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Can Core Audio maintain this latency without glitches?
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- [ ] **Format negotiation** — The headset negotiates audio format (sample rate,
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channels) via GIP. Map GIP audio formats to Core Audio
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`AudioStreamBasicDescription`.
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### 8. Build System
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- [ ] **CMake vs Xcode** — CMake is simpler for the C library portions, but
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Xcode is needed for the macOS app bundle and any DriverKit extension. Decide
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on primary build system.
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- [ ] **Minimum macOS version** — Target 12.0 (Monterey) for modern
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IOKit/DriverKit. Verify all APIs are available.
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- [ ] **Code signing** — IOKit USB access may require specific entitlements
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(`com.apple.kpi.iokit`, `com.apple.security.device.usb`). DriverKit requires
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notarization. Plan for development vs distribution signing.
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### 9. Regulatory / Legal
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- [ ] **5GHz channel restrictions** — macOS enforces regulatory domain for 5GHz.
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The dongle may try to use channels blocked in the current region. May need to
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limit to 2.4GHz only or find a way to override.
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- [ ] **Firmware license** — The firmware binaries are from Microsoft Windows
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Update. Confirm they can be redistributed with the macOS port (the Linux
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driver includes them with a disclaimer).
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### 10. Testing Hardware
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- [ ] **Dongle** — Xbox Wireless Dongle (PID 0x02FE preferred, 0x02E6 also
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works)
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- [ ] **Controller** — Xbox One or Series X|S controller (for pairing and input
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testing)
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- [ ] **Headset** — Xbox Wireless Headset (optional, for audio testing)
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- [ ] **macOS machine** — Intel or Apple Silicon (test both if possible, IOKit
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may differ)
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---
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## Quick Reference
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| Linux API | macOS Replacement | Status |
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| ------------------------- | ---------------------------------------- | ------------------------------------- |
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| `usb_control_msg()` | `IOUSBDeviceInterface->DeviceRequest()` | ✅ Done (`send_vendor_request`) |
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| `usb_bulk_msg()` | `WritePipe()` / `ReadPipeAsync()` | ✅ Done (`bulk_write`, reader thread) |
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| `usb_submit_urb()` | `ReadPipeAsync()` + `CFRunLoopSource` | ✅ Done (reader thread) |
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| `kzalloc` / `kfree` | `malloc` / `free` | ✅ Straightforward |
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| `spin_lock_irqsave` | `std::mutex` / `std::condition_variable` | ✅ Done (`usb_transport.cpp`) |
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| `msleep` / `mdelay` | `usleep()` / `clock_nanosleep()` | ☐ Test timing |
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| `crypto_shash_*` | CommonCrypto / Security.framework | ✅ Done (`auth/crypto.cpp`) |
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| `input_register_device()` | HID Proxy Driver / IOHIDSystem | ☐ Investigate |
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| `snd_pcm_*` | Core Audio (Audio Units) | ☐ Investigate |
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| `request_firmware()` | File I/O (`fopen`/`fread`) | ✅ Straightforward |
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| `cfg80211_*` | Nothing (no regulatory reporting) | ✅ Remove |
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| `bus_register()` | Custom client management | ✅ Redesign |
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| `device_create()` / sysfs | Nothing (no sysfs) | ✅ Remove |
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---
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## First Steps on macOS
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1. Plug in the dongle, run `system_profiler SPUSBDataType` — confirm it's
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detected
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2. Check `log show --predicate 'subsystem == "com.apple.iokit"'` — see if macOS
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loads any driver
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3. Open the device with `transport::probe()` and confirm endpoint enumeration
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(EP 0x04 IN/OUT, EP 0x05 IN)
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4. Try a vendor control request (register read) to verify USB communication
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works
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5. Attempt firmware load with the binary from `firmware/` directory
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