From patchwork Fri Mar 17 14:40:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 13179120 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE06BC6FD1D for ; Fri, 17 Mar 2023 14:40:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229962AbjCQOkk (ORCPT ); Fri, 17 Mar 2023 10:40:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229938AbjCQOki (ORCPT ); Fri, 17 Mar 2023 10:40:38 -0400 Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF2872D162; Fri, 17 Mar 2023 07:40:35 -0700 (PDT) Received: by mail-lf1-x134.google.com with SMTP id g17so6777291lfv.4; Fri, 17 Mar 2023 07:40:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679064034; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=zbpLZLJKhIy7G/YVz7UFfFG9vujZXHDX7wwiT21OKeY=; b=KhRYk4cnvefedpgfwqKzHuDxnbokHKHkF4xb341zj9pdf8AoDckQa6u983OjvhWLFV /WZHxpwjM/wRmsiEuohHPEB8dj7LWHmL91nVL/oFEbrEZP79/xuei6SZngG6+vRIhOSi tkMcW/Q6zerPy8mhS7LmPEeypLIdk7u9J1+p/hxL/+aJd1tE78+d/WEB6aTT+0q6LTmD bEm2i2sfDjtvrUTXBCic6P14m2Keyx5SmFTamp3MlAHM2V6U/SY9KijZ64/bfz5PhQdY fLuFjxm5xAdAq6eoONSYTA3uSndtC/3NPDv67mxFj8vPUWKldYv+0NBldzvE1aKPdzzi oFTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679064034; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=zbpLZLJKhIy7G/YVz7UFfFG9vujZXHDX7wwiT21OKeY=; b=aZHM30QqgC18sdJFvF/GtuIe/jZ3mNiuWnykJkW/GI4aCH/lffpt47FPOFU2DTIZ2W kmdtaCK5Ed5Ldrhq9WYaM5M+8gvx7d6P+bsJ8xpd04zxkJ81GEVweCvN0zEoI+rhIEjb Ctsy9pSoZcgK7RYEVNksE5UaZ7lRl4waUfOyGd8OGCvIfxh417YOQs3xbrLT7V9fySW2 MnhLIqzNDBrfrMnkK6A92db/LN7yTtkBe5y+U3kkA7CLDsHm3OJR1xRLFtoUaRYdzfvn +Q+MA0S0SjiB/WpzHLAn1E6yYZUJMk6l+lj55M6XRWnOCJX/7flpR8MvxemTayKPHIMx lQVw== X-Gm-Message-State: AO0yUKVQNxj38y9ynpX6aBYiJ75mF/uJq4m5zCmPv4VtW1NTg24Ewlvj xtt7jOHUS3cI/sDsWrYq/nA= X-Google-Smtp-Source: AK7set+aVFjyqSWi/HO0rfECTrHzFyzkAvOZSmlJmP+vAX8uKD5PEq9gMZWKzoHbtD1cO4MUKm512A== X-Received: by 2002:ac2:483a:0:b0:4db:3ddf:2fc5 with SMTP id 26-20020ac2483a000000b004db3ddf2fc5mr4443314lft.26.1679064033710; Fri, 17 Mar 2023 07:40:33 -0700 (PDT) Received: from fedora ([213.255.186.46]) by smtp.gmail.com with ESMTPSA id g14-20020a19ee0e000000b004dc4c5149dasm392051lfb.301.2023.03.17.07.40.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Mar 2023 07:40:33 -0700 (PDT) Date: Fri, 17 Mar 2023 16:40:16 +0200 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Noralf =?iso-8859-1?q?Tr=F8nnes?= , Masahiro Yamada , Randy Dunlap , Matti Vaittinen , Shreeya Patel , Krzysztof Kozlowski , Jonathan Cameron , devicetree@vger.kernel.org, Zhigang Shi , Maxime Ripard , Heikki Krogerus , Lars-Peter Clausen , Paul Gazzillo , =?iso-8859-1?q?Ma=EDra?= Canal , Rob Herring , Dmitry Osipenko , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Javier Martinez Canillas , Emma Anholt , Liam Beguin , Greg Kroah-Hartman , Maarten Lankhorst , Andy Shevchenko , Thomas Zimmermann , Daniel Vetter , "Rafael J. Wysocki" , David Airlie , Stephen Boyd Subject: [PATCH v4 0/8] Support ROHM BU27034 ALS sensor Message-ID: MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Support ROHM BU27034 ALS sensor This series adds support for ROHM BU27034 Ambient Light Sensor. The BU27034 has configurable gain and measurement (integration) time settings. Both of these have inversely proportional relation to the sensor's intensity channel scale. Many users only set the scale, which means that many drivers attempt to 'guess' the best gain+time combination to meet the scale. Usually this is the biggest integration time which allows setting the requested scale. Typically, increasing the integration time has better accuracy than increasing the gain, which often amplifies the noise as well as the real signal. However, there may be cases where more responsive sensors are needed. So, in some cases the longest integration times may not be what the user prefers. The driver has no way of knowing this. Hence, the approach taken by this series is to allow user to set both the scale and the integration time with following logic: 1. When scale is set, the existing integration time is tried to be maintained as a first priority. 1a) If the requested scale can't be met by current time, then also other time + gain combinations are searched. If scale can be met by some other integration time, then the new time may be applied. If the time setting is common for all channels, then also other channels must be able to maintain their scale with this new time (by changing their gain). The new times are scanned in the order of preference (typically the longest times first). 1b) If the requested scale can be met using current time, then only the gain for the channel is changed. 2. When the integration time change - scale is tried to be maintained. When integration time change is requested also gain for all impacted channels is adjusted so that the scale is not changed, or is chaned as little as possible. This is different from the RFCv1 where the request was rejected if suitable gain couldn't be found for some channel(s). This logic is simple. When total gain (either caused by time or hw-gain) is doubled, the scale gets halved. Also, the supported times are given a 'multiplier' value which tells how much they increase the total gain. However, when I wrote this logic in bu27034 driver, I made quite a few errors on the way - and driver got pretty big. As I am writing drivers for two other sensors (RGB C/IR + flicker BU27010 and RGB C/IR BU27008) with similar gain-time-scale logic I thought that adding common helpers for these computations might be wise. I hope this way all the bugs will be concentrated in one place and not in every individual driver ;) Hence, this series also intriduces IIO gain-time-scale helpers (abbreviated as gts-helpers) + a couple of KUnit tests for the most hairy parts. Speaking of which - testing the devm interfaces requires a 'dummy device'. There were neat helpers in DRM tests for creating and freeing such a device. This series moves those helpers to more generic location. What is worth noting is that there is something similar ongoing in the CCF territory: https://lore.kernel.org/all/20230302013822.1808711-1-sboyd@kernel.org/ These efforts should be somehow coordinated in order to avoid any ajor conflicts. Finally, these added helpers do provide some value also for drivers which only: a) allow gain change or b) allow changing both the time and gain while trying to maintain the scale. For a) we provide the gain - selector (register value) table format + selector to gain look-ups, gain <-> scale conversions and the available scales helpers. For latter case we also provide the time-tables, and actually all the APIs should be usable by setting the time multiplier to 1. (not testeted thoroughly though). Revision history: v3 => v4: (Stil ostly fixes to review comments from Andy and Jonathan) - more accurate change-log in individual patches - dt-binding and maintainer patches unchanged. - dropped unused helpers and converted ones currently used only internally to static. - extracted "dummy device" creation helpers from DRM tests. - added tests for devm APIs - dropped scale for PROCESSED channel in BU27034 and converted mLux values to luxes - dropped channel 2 GAIN setting which can't be done due to HW limitations. v2 => v3: (Mostly fixes to review comments from Andy and Jonathan) - dt-binding and maintainer patches unchanged. - iio-gts-helper tests: Use namespaces - iio-gts-helpers + bu27034 plenty of changes. See more comprehensive changelog in individual patches. RFCv1 => v2: dt-bindings: - Fix binding file name and id by using comma instead of a hyphen to separate the vendor and part names. gts-helpers: - fix include guardian - Improve kernel doc for iio_init_iio_gts. - Add iio_gts_scale_to_total_gain - Add iio_gts_total_gain_to_scale - Fix review comments from Jonathan - add documentation to few functions - replace 0xffffffffffffffffLLU by U64_MAX - some styling fixes - drop unnecessary NULL checks - order function arguments by in / out purpose - drop GAIN_SCALE_ITIME_MS() - Add helpers for available scales and times - Rename to iio-gts-helpers gts-tests: - add tests for available scales/times helpers - adapt to renamed iio-gts-helpers.h header bu27034-driver: - (really) protect read-only registers - fix get and set gain - buffered mode - Protect the whole sequences including meas_en/meas_dis to avoid messing up the enable / disable order - typofixes / doc improvements - change dropped GAIN_SCALE_ITIME_MS() to GAIN_SCALE_ITIME_US() - use more accurate scale for lux channel (milli lux) - provide available scales / integration times (using helpers). - adapt to renamed iio-gts-helpers.h file - bu27034 - longer lines in Kconfig - Drop bu27034_meas_en and bu27034_meas_dis wrappers. - Change device-name from bu27034-als to bu27034 MAINTAINERS: - Add iio-list --- Matti Vaittinen (8): drm/tests: helpers: rename generic helpers kunit: drm/tests: move generic helpers dt-bindings: iio: light: Support ROHM BU27034 iio: light: Add gain-time-scale helpers iio: test: test gain-time-scale helpers MAINTAINERS: Add IIO gain-time-scale helpers iio: light: ROHM BU27034 Ambient Light Sensor MAINTAINERS: Add ROHM BU27034 .../bindings/iio/light/rohm,bu27034.yaml | 46 + MAINTAINERS | 14 + drivers/base/test/Kconfig | 5 + drivers/base/test/Makefile | 2 + drivers/base/test/test_kunit_device.c | 83 + drivers/gpu/drm/Kconfig | 2 + .../gpu/drm/tests/drm_client_modeset_test.c | 5 +- drivers/gpu/drm/tests/drm_kunit_helpers.c | 69 - drivers/gpu/drm/tests/drm_managed_test.c | 5 +- drivers/gpu/drm/tests/drm_modes_test.c | 5 +- drivers/gpu/drm/tests/drm_probe_helper_test.c | 5 +- drivers/gpu/drm/vc4/Kconfig | 1 + drivers/gpu/drm/vc4/tests/vc4_mock.c | 3 +- .../gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 9 +- drivers/iio/Kconfig | 3 + drivers/iio/Makefile | 1 + drivers/iio/industrialio-gts-helper.c | 990 +++++++++++ drivers/iio/light/Kconfig | 14 + drivers/iio/light/Makefile | 1 + drivers/iio/light/rohm-bu27034.c | 1491 +++++++++++++++++ drivers/iio/test/Kconfig | 16 + drivers/iio/test/Makefile | 1 + drivers/iio/test/iio-test-gts.c | 461 +++++ include/drm/drm_kunit_helpers.h | 7 +- include/linux/iio/iio-gts-helper.h | 113 ++ 25 files changed, 3265 insertions(+), 87 deletions(-) create mode 100644 Documentation/devicetree/bindings/iio/light/rohm,bu27034.yaml create mode 100644 drivers/base/test/test_kunit_device.c create mode 100644 drivers/iio/industrialio-gts-helper.c create mode 100644 drivers/iio/light/rohm-bu27034.c create mode 100644 drivers/iio/test/iio-test-gts.c create mode 100644 include/linux/iio/iio-gts-helper.h base-commit: eeac8ede17557680855031c6f305ece2378af326