From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f175.google.com (mail-pf1-f175.google.com [209.85.210.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 833C83D47D4 for ; Wed, 29 Apr 2026 13:22:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777468966; cv=none; b=ASpIbipelDDix1Ub0ysn5QoG1dtdpaXoN2OqvpXgMblS9w+n9n+bRcwd7CGLzfU2OkZ4UAmuISPD4RmF34/bUU82wDrjKxLSOu7q7YbZnEhEpSegwM0SPzlAJutMgo2KcFzK7Yx2GZl7X/uqKACDOwGuQf1EtH73Kd17mA7HA9c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777468966; c=relaxed/simple; bh=QntNCRxsqRUOS0ylI7Pz/qxqd7q8WopawYe4imAZ9cM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=s2MWz+1QnyytVq2d9mYHhICmCEoaVoGYIjmp79E0lygJJ3eAT7GhuNXAtUdd9TuWvdqpl7zcF+h5nyy0g4VXNxJtDNtul1lqAAv6O4MaJpSvroaOupO8XjIzowqpOTUM7ItFeqoyGUV1PY6zD3k2sL0FVrouO6VLxN1/6Squfwg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=a+og0c+k; arc=none smtp.client-ip=209.85.210.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="a+og0c+k" Received: by mail-pf1-f175.google.com with SMTP id d2e1a72fcca58-82418b0178cso7594025b3a.1 for ; Wed, 29 Apr 2026 06:22:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1777468965; x=1778073765; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=GHDw5P/WKuWdQLGr63cox/hFUSLBxTNMcAldluDTWOk=; b=a+og0c+kQ+B8MfH1G9mvqqOKRs14SiqfH9j7JV23DE0DZYMvYXQXwCn32fHimOap6J YHLRsvH7Be3Vzo0FzKAXPyJmjwbuu1wW2etthAkVW9BKciXEIBZ7xT3Wx4CRNFGkNFjg fpc6wlPwL7UX3evvJVJDqXGM6xfv0DrZOGo1P+l+0fSP516/XrM+I89uL+xCZryepvfa 9EyZ3FS/HMls2vEjFtX+oqfZnfDw1HDG64RnqGRWxOEriI6+73JiBv9lxe/ClIZMxLaa GBnHKD0DrQp13HttYuRSNBn5WDg4QkXhN4rDVL9m+Bu1zM5CC6iifnbiwRNK3tgK/L7R 8QNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777468965; x=1778073765; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=GHDw5P/WKuWdQLGr63cox/hFUSLBxTNMcAldluDTWOk=; b=Pcv8jT/TwT39RYBE8UpcaGmSXIyg8Q/H/acvvL9GqyY43uD0WLA7yYzGVs44HdY4wQ QbEPnh5pMFyDUgID6u/3t6N1xG80HD6+YTVNs2F4bBfwg/wXaFFvkcFDMnHFIijhhrSN 5Lb2GpNBOsvgW8GCTMatF6OMezrTCdREbjUWKXUGJxWTiLRkT4248bouiRq5pcI/vraH OQOhYxKSWikM7W5oM1ybxroyW4h1uM0Yr0B+nCb0B39aMWV4tv/J//vt2iqIpk0Df7T2 U23epmu7VvK0QT6jnZ17bPGKQ60PYLG7erPPj0h7ySqwIP5uI1s2w1Js8fvNmyyrw2Qu iQtg== X-Forwarded-Encrypted: i=1; AFNElJ/r/9UVLHnrmJDZUfijg/oNdC2+Ms7H8d8gtbpryZ5ZW30ELMhK0f/e8kjnLkQJBIzNKBPqtwW/vSz6IKU=@vger.kernel.org X-Gm-Message-State: AOJu0Ywvp6JU0DrZGHBMSHWgn2kmYG/YQM/kniZB+89AES8wsC5R7Ebd kevtzUrEUyl1GQI4fKVDUn1G+MWcg4anGfnsO9YU6E8m7bqG6u9Ikku2 X-Gm-Gg: AeBDievDHEIbPqwwzWS5X9S4SNWfuGTcc1I5s7Hx+XlN3SU0paQfTMA9NK1BsbuaCHe mgn78vnvPYjbDNuaYN8Xi+A8kR6ap4ywQ0pdG7H3H7E+Tjg8p1ZdS4PRnmiBzNBfCyaKodo9sYM 5QmMULL43u8kQJLZeM3K2svdP75OjPzhKBs9HOviG5qxss+N/hcIWfi01Ed0jTuZ2KiXBdZ5mi0 cr/Hb01oU//vNO5mXdjfSC2Ya0WWZcxW1dxTO5mulXa7mAmZbQBe4O1Hq/uShZmch70Yr9y01wj Sf0DWbAaWNzTpNMp9nFD9jQ0/6GT6wgX2Ao+n5Gt+G+5R8AavI51aNbHXOGnI4SYklYy6JUbprq xgFR3U/HxK5I3fMDLtKayyGq7E/ZkP8DrJG1nsulyysGTZUYledB7WHg2hwYd36HGWFzGgB+KFZ 1eSOLAZtMC5CPMYwWkwe10FVlrSva3mB4Bgbld+XufRs0nxVHLrX2FNux/GTm/ukBh1MvXFFB84 pjUyMPiu8FA8wM= X-Received: by 2002:a05:6a00:950d:b0:82c:212a:a9b5 with SMTP id d2e1a72fcca58-834ea663abdmr3633488b3a.36.1777468964920; Wed, 29 Apr 2026 06:22:44 -0700 (PDT) Received: from localhost.localdomain ([2001:448a:2002:4381:3859:fd0d:505e:362c]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-834ed5cd407sm2091372b3a.13.2026.04.29.06.22.39 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 29 Apr 2026 06:22:44 -0700 (PDT) From: Muchamad Coirul Anwar To: jic23@kernel.org, linux-iio@vger.kernel.org, rust-for-linux@vger.kernel.org, devicetree@vger.kernel.org Cc: branstj@gmail.com, lars@metafoo.de, ojeda@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, igor.korotin.linux@gmail.com, linux-kernel@vger.kernel.org, Muchamad Coirul Anwar Subject: [RFC PATCH v2 0/4] iio: position: add Rust driver for ams AS5600 Date: Wed, 29 Apr 2026 20:22:26 +0700 Message-ID: <20260429132234.30514-1-muchamadcoirulanwar@gmail.com> X-Mailer: git-send-email 2.50.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This is v2 of the Rust driver for the ams AS5600 12-bit magnetic rotary position sensor. v1 was a probe-only stub; this version adds minimal Rust IIO abstractions and exposes in_angl_raw and in_angl_scale via sysfs. Link: https://lore.kernel.org/linux-iio/20260419151327.26306-1-muchamadcoirulanwar@gmail.com/ Changes since RFC v1: - Moved magnet validation from probe() to read_raw() per Jonathan's feedback. probe() now only verifies I2C communication. - Added minimal Rust IIO abstractions (rust/kernel/iio.rs) wrapping iio_device_alloc, iio_device_register, and the read_raw callback. - Added OF device table for devicetree matching (ams,as5600). - Replaced hex bit masks with kernel::bits::bit_u8() per Miguel's pointer. - Replaced magic numbers with bindings constants (iio_chan_info_enum_*, INDIO_DIRECT_MODE). - Downgraded log messages to dev_dbg!(), removed unbind noise. - Added devicetree binding documentation. - iio_info vtable is now a compile-time const. - Uses iio_device_alloc with PinnedDrop instead of devm_* to avoid lifetime conflicts with Rust's ownership model. The IIO abstraction design was informed by earlier unpublished work from Brandon Saint-John. The IIO abstraction is intentionally minimal: it supports read_raw with IIO_VAL_INT, IIO_VAL_INT_PLUS_NANO, IIO_VAL_INT_PLUS_MICRO, and IIO_VAL_FRACTIONAL. write_raw and buffer support are left for future work. Muchamad Coirul Anwar (4): i2c: rust: add smbus_read_byte_data and smbus_read_word_data rust: add minimal IIO subsystem abstractions dt-bindings: iio: position: add ams,as5600 iio: position: add Rust driver for ams AS5600 Signed-off-by: Muchamad Coirul Anwar --- Tested on BeagleBone Black (AM335x), kernel v7.0.0-rc3, AS5600 on i2c-2 (0x36) at 3.3V, diametric neodymium magnet. $ cat /sys/bus/iio/devices/iio:device0/in_angl_raw 3296 $ cat /sys/bus/iio/devices/iio:device0/in_angl_raw 1675 $ cat /sys/bus/iio/devices/iio:device0/in_angl_raw 468 $ cat /sys/bus/iio/devices/iio:device0/in_angl_scale 0.001533981 Magnet removed: $ cat /sys/bus/iio/devices/iio:device0/in_angl_raw cat: '/sys/bus/iio/devices/iio:device0/in_angl_raw': No data available Muchamad Coirul Anwar (4): i2c: rust: add smbus_read_byte_data and smbus_read_word_data rust: add minimal IIO subsystem abstractions dt-bindings: iio: position: add ams,as5600 iio: position: add Rust driver for ams AS5600 .../bindings/iio/position/ams,as5600.yaml | 40 ++++ drivers/iio/position/Kconfig | 14 ++ drivers/iio/position/Makefile | 1 + drivers/iio/position/as5600.rs | 129 +++++ rust/bindings/bindings_helper.h | 2 + rust/kernel/i2c.rs | 24 + rust/kernel/iio.rs | 224 ++++++++++ rust/kernel/lib.rs | 2 + 8 files changed, 436 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/position/ams,as5600.yaml create mode 100644 drivers/iio/position/as5600.rs create mode 100644 rust/kernel/iio.rs -- 2.50.0