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Fri, 16 Oct 2026 05:34:00 -0700 (PDT) From: wyibo6109@gmail.com To: Dmitry Torokhov , linux-input@vger.kernel.org Cc: Krzysztof Kozlowski , Rob Herring , Conor Dooley , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yibo Wang Subject: [PATCH v5 0/2] Input: add support for OnePlus/OPPO Pad pogo-pin keyboards Date: Fri, 16 Oct 2026 07:33:32 -0500 Message-ID: <20261016123334.1019257-1-wyibo6109@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261015110859.203989-1-wyibo6109@gmail.com> References: <20261015110859.203989-1-wyibo6109@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Yibo Wang This series adds support for the magnetic pogo-pin smart keyboards of the OnePlus Pad 3 Pro / Pad 4 and the OPPO Pad 5 Pro. The keyboard is built around a Tinno MCU attached to a tablet UART. Both sides share a single data wire, so the host gates its transmission onto the bus with a PMIC GPIO for the duration of a frame, and every host frame is echoed back on RX. The MCU speaks a framed "one wire bus" protocol over the half-duplex 921600 8N1 UART: 8x 0x55 preamble, 0xF1, src/dst addresses, command, length, payload, CRC16-IBM (poly 0x8005, init 0xC596), 0xFE and 4x 0xAA. The protocol was reverse engineered from the vendor kernel driver; this is a clean-room serdev reimplementation that replaces the downstream platform driver, which depends on a private msm_geni_serial callback and a user-space held tty fd. The core protocol (framing, keys, touchpad, sync/heartbeat) has been carried unchanged across four SoC generations of these keyboards, from the sm8550 era to the sm8850 ones covered here; only the 0x3A general sub-commands grew over time. Patch 1 adds the DT binding, patch 2 the driver. Changes in v5, addressing Rob Herring's comments on the binding: - dropped the block scalar from the top-level description; - rewrapped the descriptions to stay within 75 columns; - restored the serial parent node in the example. Changes in v4, after Krzysztof Kozlowski's comment that the binding describes the keyboard rather than the MCU (wording only, no functional change): - the binding description and the commit messages now describe the keyboard (built around the Tinno MCU) instead of the MCU itself, and spell out that a keyboard is a fixed physical device, so the touchpad geometry and the product names are per-compatible constants in the driver. Changes in v3: - the compatible names the tablet project the pogo port belongs to (oneplus,caihong- / erhai- / iceland-pogo-keyboard, the codenames used by the vendor trees), and the driver carries a per-project description in the OF match data: feature flags gate each 0x3A general sub-command (caihong, sm8650 era, has no wake notification and no backlight; erhai, sm8750 era, adds the wake notification; iceland, sm8850 era, adds the keyboard backlight), while the touchpad geometry and the per-brand product names are per-project constants - the wake notification is skipped and the backlight LED only registered where supported; - the touchpad geometry and product names are no longer DT properties: they are fixed per project and live in the driver; the common touchscreen properties (touchscreen-size-x/y, touchscreen-x-mm/y-mm) remain as an optional override, parsed with touchscreen_parse_properties(), for the unlikely case of a variant. Changes in v2: - dropped the redundant "binding" from the dt-bindings subject; - replaced the custom oneplus,touchpad-xy-max/-resolution properties with the common touchscreen properties; - dropped the serial wrapper node from the binding example; - the MAINTAINERS entry added with the binding references only the binding file; the driver F: line is added together with the driver patch. Tested on the OnePlus Pad 4 (iceland) running Linux 7.2.0-sm8850 (v7.2-based iceland tree). Yibo Wang (2): dt-bindings: input: add OnePlus pogo-pin keyboard Input: add OnePlus/OPPO Pad pogo-pin keyboard serdev driver .../bindings/input/oneplus,pogo-keyboard.yaml | 76 + MAINTAINERS | 7 + drivers/input/keyboard/Kconfig | 13 + drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/oneplus-pogo-kbd.c | 1263 +++++++++++++++++ 5 files changed, 1360 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/oneplus,pogo-keyboard.yaml create mode 100644 drivers/input/keyboard/oneplus-pogo-kbd.c -- 2.53.0