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[108.228.232.20]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-134cbdcf140sm25383312c88.5.2026.05.19.18.32.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 18:32:00 -0700 (PDT) From: "Derek J. Clark" To: Jiri Kosina , Benjamin Tissoires Cc: "Pierre-Loup A . Griffais" , Denis Benato , Zhouwang Huang , "Derek J . Clark" , linux-input@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 0/4] Add MSI Claw HID Configuration Driver Date: Wed, 20 May 2026 01:31:54 +0000 Message-ID: <20260520013158.3633277-1-derekjohn.clark@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds an HID Configuration driver for the MSI Claw line of Handheld Gaming PC's. The MSI Claw HID interface provides multiple features, such as the ability to switch between xinput, dinput, and a desktop mode, RGB control, rumble intensity, and mapping of the rear "M" keys. There are additional gamepad modes that are not included in this driver as they appear to be used in assembly line testing or are incomplete in the firmware. During my testing I found them to be unstable. The initial version of this driver was written by Denis Benato, which contained the initial reverse-engineering and implementation for the gamepad mode switching. This work was later expanded by Zhouwang Huang to include more gamepad modes and additional features. Finally, I refactored the entire driver, fixed multiple bugs, and refined the overall format to conform to kernel driver best practices and style guide. Claude was used initially by Zhouwang Huang to quickly parse HID captures during the reverse-engineering of some of the features. Since Claude had already been used, as a test of its capabilities I had it implement the rumble intensity attribute after I had already rewritten most of the driver, which I then manually edited to fix some mistakes. I also used Claude to review the driver and these patches for any mistakes and bugs. Assisted-by: Claude:claude-sonnet-4-6 Co-developed-by: Denis Benato Signed-off-by: Denis Benato Co-developed-by: Zhouwang Huang Signed-off-by: Zhouwang Huang Signed-off-by: Derek J. Clark --- v7: - Use smp_[store_release|load_acquire] pattern for checking gamepad_registered and rgb_registered to avoid possible races during teardown. - Reorder reinit_completion in claw_hw_output_report to avoid race with possible incoming ACKs. - Reorder cancel_delayed_work_sync to ensure setup can't be re-armed after cancel. - Reset command state machine if hw_output_report has an error. - Add comments to (hopefully) silence sashinko-bot warnings about the use of endpoint matching and the impossible scenario of switching to the alternate endpoint from userspace while the driver is bound. - Don't use spinlock_irqsave when already in irq context. - Add profile_lock for read/write profile_pending. - Use struct for mkey reports and rumble reports, following the pattern established by rgb reports previously. - Add gating to cfg_setup_fn, allowing either gamepad settings or rgb settings to populate if the other fails for any reason. - Match on write address for rumble and mkey reports to prevent late ACK from causing synchronization errors. v6: https://lore.kernel.org/linux-input/20260518222935.1802071-1-derekjohn.clark@gmail.com/ - Add send/ack pattern to ensure synchronous acks. - Use spinlock_irqsave instead of mutex for read/write MODE event data. - add select NEW_LEDS to kconfig. - Make all timeouts 25ms to ensure at least 2 jiffies in a 100Hz config. - Gate all attribute show/store functions with gamepad_registered or rgb_registered, enabling use of devm_device_add_group and ending the need to hold a mutex during remove. - Don't set gamepad_mode on resume, MCU preserves state. - Ensure all count variables are checked for > 0 characters before setting buf - 1 to \n. - Re-arm cfg_setup in resume if it was canceled in an early suspend. - Remove duplicated argv_free macro. - Add spinlock_irqsave vice mutex for read/write access on attribute variables. v5: https://lore.kernel.org/linux-input/20260517013925.3120314-1-derekjohn.clark@gmail.com/ - Swap disabled & combination mkeys_function enum values. - Fix bug introduced in v5 where claw_buttons_store would return -EINVAL on all valid key entries. - Ensure mode_mutex is properly init. - Ensure claw_remove is calling hid_hw_close and not hid_hw_stop for all paths. - Ensure adding "DISABLED" key to valid entries is done in the correct patch. - Re-enable sending an empty string to clear button mappings in addition to setting DISABLED. - Move adding the RGB device into cfg_setup to prevent led core attributes from being written to prior to setup completing. - Ensure frame_lock is properly init. - Change variable names in RGB functions from frame and zone to f and z respectively to fit all scoped_guard actions in 100 columns. v4: https://lore.kernel.org/linux-input/20260516042841.500299-1-derekjohn.clark@gmail.com/ - Add msi_suspend/claw_suspend. - Reorder claw_remove to cancel all work before removing sysfs. - Add mutex lock for removing sysfs attributes. - Add mutex lock for MODE command data read/write. - Change dev_warn to dev_dbg in claw_profile_event. - use __free with DEFINE_FREE macro for argv instead of manually running argv_free, cleaining up scoped_guard goto. - Fix frame_calc validity check to use >=. - Use spinlock instead of mutex in raw_event and related attribute _store function. - Ensure delayed work is canceled in suspend & canceled before sysfs attribute removal. v3: https://lore.kernel.org/linux-input/20260515033622.2095277-1-derekjohn.clark@gmail.com/ - Add mutex for read/write if rgb frame data. - Ensure claw_hw_output_report is properly guarded. - Remove setting rgb_frame_count when reading rgb profiles as it always returns garbage data. - Ensure rgb_speed is getting drvdata from a valid lookup (not hdev). - Use scoped_guard where necessary. - Reoder claw_probe to ensure all mutex, completion, and variable assignments are in place prior to setting drvdata. - Ensure gamepad_mode is set to a valid enum value in claw_probe. v2: https://lore.kernel.org/linux-input/20260513231445.3213501-1-derekjohn.clark@gmail.com/ - Use mutexes to guard SYNC_TO_ROM calls and pending_profile calls. - Rename driver to hid-msi and add generic entrypoints for probe/resume/remove that call claw specific functions in order to future proof the driver for other MSI HID interfaces. - Fix various bugs and formatting issues. v1: https://lore.kernel.org/linux-input/20260510043510.442807-1-derekjohn.clark@gmail.com/ Derek J. Clark (4): HID: hid-msi: Add MSI Claw configuration driver HID: hid-msi: Add M-key mapping attributes HID: hid-msi: Add RGB control interface HID: hid-msi: Add Rumble Intensity Attributes MAINTAINERS | 6 + drivers/hid/Kconfig | 13 + drivers/hid/Makefile | 1 + drivers/hid/hid-ids.h | 5 + drivers/hid/hid-msi.c | 1911 +++++++++++++++++++++++++++++++++++++++++ 5 files changed, 1936 insertions(+) create mode 100644 drivers/hid/hid-msi.c -- 2.53.0