From nobody Thu Oct 2 14:24:23 2025 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 393D52F83D3; Tue, 16 Sep 2025 10:24:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758018263; cv=none; b=Gmb1d68rsSFZVu3jylXnz9MJRCzXOxKtphR7AidbS3puQ8VFrmMSCaNOM2BFf/Xel6w+WAFfwoLEK4wHYd5d5PXteG8jRGmH7r9NZJ4tm1607oqQY475+0H8YuXSXrAa9og2h/hKoZQQEv6+HP3ZdaIRmYo8C+S8OTKodUidxeU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758018263; c=relaxed/simple; bh=JY0fFNmZkGmq+Wab0Bv84GX2dVej9Vw1GK950MMgu+k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=R7YchVai0Z7RuMCKqbMK5BCDwTj5deXDn1kj2EMF57UKOdRV3l5HAbXnPg146dyQZmZLeydZA4h3TYVaAFuEAYbYoX09yJ4VQkdfQZawvrBUBXa5cqYLGU8Nfq2eY9c3xdhS24oZiwp8TNBq1wB+3qTCwKKf7FLVHDPB2HyWXb0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=OqeqPqTB; arc=none smtp.client-ip=185.246.85.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="OqeqPqTB" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 950B24E40BE1; Tue, 16 Sep 2025 10:24:18 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 6ABC46061E; Tue, 16 Sep 2025 10:24:18 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 5CD85102F16E3; Tue, 16 Sep 2025 12:24:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1758018257; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=+w4qyJOBPfboDMhAjnHDcdTXTS+iPutFVtkMdVT7DPE=; b=OqeqPqTBJQmL7dz4Ya3Y4NvUZ2Qx3yawiot0xxwi5v33XjNj7OkUDfZvwDrB71ANLTHzz4 MsI1HCeK51gK6tDryCfoNlxi0ia/2oBZBEFa2Koc0evvx1bBWZtQ5Xr22ucW27hEcYgxB0 HHb1jJ9/4lKi6iPPKrB+TCajpzuxkyw/vbYmHJ4WZZtyH9RHwsfZ2RzAicjIYIvKAMrYxc KOGYOOVGclAXVpjEgcMOZmWHhSTNLlOaMtrJNt7i1ZMWaRZDDg4H2FGdEQNzJ7tXDIRPPl 2JtPXYPX5PsLNZkzJoAmT1QEe7ZltKAmsLStQuJm6TWGACvWOHEHQ87UwkUR1A== From: Romain Gantois Date: Tue, 16 Sep 2025 12:24:07 +0200 Subject: [PATCH 2/4] iio: add processed write API Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250916-ltm8054-driver-v1-2-fd4e781d33b9@bootlin.com> References: <20250916-ltm8054-driver-v1-0-fd4e781d33b9@bootlin.com> In-Reply-To: <20250916-ltm8054-driver-v1-0-fd4e781d33b9@bootlin.com> To: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko Cc: Thomas Petazzoni , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Romain Gantois X-Mailer: b4 0.14.2 X-Last-TLS-Session-Version: TLSv1.3 Add a function to allow IIO consumers to write a processed value to a channel. Signed-off-by: Romain Gantois --- drivers/iio/inkern.c | 99 ++++++++++++++++++++++++++++++++++++++++= ++++ include/linux/iio/consumer.h | 17 ++++++++ 2 files changed, 116 insertions(+) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index c174ebb7d5e6d183674b7ffb15c4ce0f65fa3aed..6486fdb7c66a4c84312541f0f42= cc24469972a9c 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -598,6 +598,85 @@ int iio_read_channel_average_raw(struct iio_channel *c= han, int *val) } EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); =20 +static int iio_convert_processed_to_raw_unlocked(struct iio_channel *chan, + int processed, int *raw, + unsigned int scale) +{ + int scale_type, scale_val, scale_val2; + int offset_type, offset_val, offset_val2; + s64 tmp_num, tmp_den; + + scale_type =3D iio_channel_read(chan, &scale_val, &scale_val2, + IIO_CHAN_INFO_SCALE); + if (scale_type >=3D 0) { + switch (scale_type) { + case IIO_VAL_INT: + tmp_num =3D processed; + tmp_den =3D scale_val; + break; + case IIO_VAL_INT_PLUS_MICRO: + tmp_num =3D (s64)processed * 1000000LL; + + if (scale_val2 < 0) { + tmp_den =3D (s64)scale_val * 1000000LL - (s64)scale_val2; + tmp_den *=3D -1; + } else { + tmp_den =3D (s64)scale_val * 1000000LL + (s64)scale_val2; + } + + break; + case IIO_VAL_INT_PLUS_NANO: + tmp_num =3D (s64)processed * 1000000000LL; + + if (scale_val2 < 0) { + tmp_den =3D (s64)scale_val * 1000000000LL - (s64)scale_val2; + tmp_den *=3D -1; + } else { + tmp_den =3D (s64)scale_val * 1000000000LL + (s64)scale_val2; + } + + break; + case IIO_VAL_FRACTIONAL: + tmp_num =3D (s64)processed * (s64)scale_val2; + tmp_den =3D scale_val; + break; + case IIO_VAL_FRACTIONAL_LOG2: + tmp_num =3D (s64)processed << scale_val2; + tmp_den =3D scale_val; + break; + default: + return -EINVAL; + } + + tmp_den *=3D scale; + + *raw =3D div64_s64(tmp_num, tmp_den); + } + + offset_type =3D iio_channel_read(chan, &offset_val, &offset_val2, + IIO_CHAN_INFO_OFFSET); + if (offset_type >=3D 0) { + switch (offset_type) { + case IIO_VAL_INT: + case IIO_VAL_INT_PLUS_MICRO: + case IIO_VAL_INT_PLUS_NANO: + break; + case IIO_VAL_FRACTIONAL: + offset_val /=3D offset_val2; + break; + case IIO_VAL_FRACTIONAL_LOG2: + offset_val >>=3D offset_val2; + break; + default: + return -EINVAL; + } + + *raw -=3D offset_val; + } + + return 0; +} + static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, int raw, int *processed, unsigned int scale) @@ -1028,3 +1107,23 @@ ssize_t iio_read_channel_label(struct iio_channel *c= han, char *buf) return do_iio_read_channel_label(chan->indio_dev, chan->channel, buf); } EXPORT_SYMBOL_GPL(iio_read_channel_label); + +int iio_write_channel_processed_scale(struct iio_channel *chan, int val, + unsigned int scale) +{ + struct iio_dev_opaque *iio_dev_opaque =3D to_iio_dev_opaque(chan->indio_d= ev); + int ret, processed; + + guard(mutex)(&iio_dev_opaque->info_exist_lock); + + if (!chan->indio_dev->info) + return -ENODEV; + + ret =3D iio_convert_processed_to_raw_unlocked(chan, val, &processed, scal= e); + if (ret) + return ret; + + return iio_channel_write(chan, processed, 0, IIO_CHAN_INFO_RAW); +} +EXPORT_SYMBOL_GPL(iio_write_channel_processed_scale); + diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 6a44796164792b2dd930f8168b14de327a80a6f7..79c4804a73b0652d4c16ee5ad07= c4543bccd6c92 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -451,4 +451,21 @@ ssize_t iio_write_channel_ext_info(struct iio_channel = *chan, const char *attr, */ ssize_t iio_read_channel_label(struct iio_channel *chan, char *buf); =20 +/** + * iio_write_channel_processed_scale() - scale and write processed value t= o a given channel + * @chan: The channel being queried. + * @val: Value to write. + * @scale: Scale factor to apply during the conversion + * + * Returns an error code or 0. + * + * This function writes a processed value to a channel. A processed value = means + * that this value will have the correct unit and not some device internal + * representation. If the device does not support writing a processed valu= e, the + * function will query the channel's scale and offset and write an appropr= iately + * transformed raw value. + */ +int iio_write_channel_processed_scale(struct iio_channel *chan, int val, + unsigned int scale); + #endif --=20 2.51.0