From patchwork Sun Sep 29 11:25:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasileios Amoiridis X-Patchwork-Id: 13815072 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (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 EF4B2175D32; Sun, 29 Sep 2024 11:25:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727609124; cv=none; b=akePM1ha7vAhb6xQn7SDJBjzgWipLrihKQYWHSxy5F/yLVR8cMunyp/OkodT15LSjSfqidmNQs1eWMEeAskkJZGgurM1m4glHBPxhO6N9YVhRnxGivwKzpaUoY/S/v8xs6CD9v3+t66Q/YpECyBo94Tnzqx9IU5p5oIc+TLs2Kw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727609124; c=relaxed/simple; bh=X7fORzgExfQA0C69v6mdx3BvSNCqFSI75V/IXIa61q4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=tuo7qsr1Hf5y8DqxOQKASOvMCbfWcu4wulNsggaXVmkO9a41oizbeS1KnEYnXS1f0Vc0VSDsetHC499LhB2UrxR082zPXTTcqwJHLRJP61IJQQk+8o6tv1vzvcuN+iS85dFZmv724x3MoL9KSHnHsOi6BVTT+ei4yz2ThB7QP8Q= 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=jb9i1rlB; arc=none smtp.client-ip=209.85.128.44 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="jb9i1rlB" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-42cbe624c59so27891085e9.3; Sun, 29 Sep 2024 04:25:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1727609121; x=1728213921; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=dyzHFaozNPNRfwrQWOh+rrvCgTOHdjJlFF8sSYQJj8g=; b=jb9i1rlBHNZxMKTqwA6RZ1aN642VunS7W40ZCe1v+8qw7ekEThrDJXEIUyVR/VbVks yhlnyrACPJtdnwP2YdFvd0rlBbgReJK/bScvIGjXqjFw1uFeWJU3TbO9IboenXcdQUCn nuELQ/HVIgcM3jf/xqAc7IBNP69pLU4kRWYNA3bFrUzdQzW4DbfNWMZjSDbx1amsq7Xs JVzNd3dud9ib0hYLUM/lu8yvEvcKwPDSNVmy3vVALRQJg4FHmXjaMXVFO6Tmg4rgSKKI XfnKs7zDJmPaVNLW95qgIEHVMMnO/j7rmuptN/FYifIoUavr8dIuDmIA6o8xLAOOvWko Pn7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727609121; x=1728213921; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=dyzHFaozNPNRfwrQWOh+rrvCgTOHdjJlFF8sSYQJj8g=; b=aS1t4TthvNdt7i1n0CTNSqagBHz5/JUxvECN6Vo03qBrbemClx/8eaXwgrMvZ4GPug pTedmNGvrzeG/uZ78b69pDpvKSvSUq0xtpo5TiqmYm/S/AFCuTRWUh8taMcT4AenoHhf n1fFCp+pMV8Suw6RTbcKPgTqSGDUqa5mPzD8wcXUjeUEV7GhT/xPGhVOMLhHkkYuXUKm jmE5Ew4PcIKaOEd5CiqeyjeAsYSymgMLG/v1U7J4EolPZoBMj3gmpIDrdDWwUAjXuyba Twh3Ipr81IydtAja3S0rGWm/oi0Q1vnRflzik3UCXBlaVk+D4GWuP9r7yr3MQ3V19bHA atrw== X-Forwarded-Encrypted: i=1; AJvYcCUhRVJO1IjEcHQlA8aCqO1QCYIO+NpSvzkUoZaCI9D/1+zMtV+wFT+ZL8izmUJSJy0a2xWHCv9VDXS/ZtRu@vger.kernel.org, AJvYcCUmtb69ma1FLAh+XKtQnXtwVaPeJiy+nZRHk7esg91HQN18AzDjGOT2LKjW4UG+iCNqMrVoj1hL29M=@vger.kernel.org X-Gm-Message-State: AOJu0YzBRn/wc8QIaUQT/NbgjtPve6qnf3m3XFQ9IIitqCyTD5ulehNQ eeb6WmH6B0nvMyw7o4E70LvbwW4TQ0TRQA4ByJdnjiXf0LGFqv/iDZKN1+Pn X-Google-Smtp-Source: AGHT+IEDQCu4uBTkegCrLYqMLI0mYo1OyKgpWYgmrRPbWa/wTPJLtH6LGCaMFbitQU3amAhRaaxskg== X-Received: by 2002:a05:600c:3b93:b0:426:689b:65b7 with SMTP id 5b1f17b1804b1-42f58485cc1mr63667835e9.25.1727609120938; Sun, 29 Sep 2024 04:25:20 -0700 (PDT) Received: from localhost.localdomain ([2a04:ee41:82:7577:df60:d786:cd5:d3c1]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42f57de1192sm74717325e9.14.2024.09.29.04.25.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 29 Sep 2024 04:25:19 -0700 (PDT) From: Vasileios Amoiridis To: jic23@kernel.org Cc: dan.carpenter@linaro.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Vasileios Amoiridis Subject: [PATCH v2 2/2] iio: pressure: bmp280: Use char instead of s32 for data buffer Date: Sun, 29 Sep 2024 13:25:11 +0200 Message-Id: <20240929112511.100292-3-vassilisamir@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240929112511.100292-1-vassilisamir@gmail.com> References: <20240929112511.100292-1-vassilisamir@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 As it was reported and discussed here [1], storing the sensor data in an endian aware s32 buffer is not optimal. Advertising the timestamp as an addition of 2 s32 variables which is also implied is again not the best practice. For that reason, change the s32 sensor_data buffer to a char buffer with an extra value for the timestamp (as it is common practice). [1]: https://lore.kernel.org/linux-iio/73d13cc0-afb9-4306-b498-5d821728c3ba@stanley.mountain/ Signed-off-by: Vasileios Amoiridis --- drivers/iio/pressure/bmp280-core.c | 78 ++++++++++++++++++------------ drivers/iio/pressure/bmp280.h | 5 +- 2 files changed, 51 insertions(+), 32 deletions(-) diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c index 472a6696303b..2c62490a40c6 100644 --- a/drivers/iio/pressure/bmp280-core.c +++ b/drivers/iio/pressure/bmp280-core.c @@ -1023,9 +1023,9 @@ static irqreturn_t bmp280_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct bmp280_data *data = iio_priv(indio_dev); - u32 adc_temp, adc_press; - s32 t_fine; - int ret; + u32 adc_temp, adc_press, comp_press; + s32 t_fine, comp_temp; + int ret, offset; guard(mutex)(&data->lock); @@ -1044,7 +1044,7 @@ static irqreturn_t bmp280_trigger_handler(int irq, void *p) goto out; } - data->sensor_data[1] = bmp280_compensate_temp(data, adc_temp); + comp_temp = bmp280_compensate_temp(data, adc_temp); /* Pressure calculations */ adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0])); @@ -1054,10 +1054,13 @@ static irqreturn_t bmp280_trigger_handler(int irq, void *p) } t_fine = bmp280_calc_t_fine(data, adc_temp); + comp_press = bmp280_compensate_press(data, adc_press, t_fine); - data->sensor_data[0] = bmp280_compensate_press(data, adc_press, t_fine); + memcpy(&data->buffer.buf[offset], &comp_press, sizeof(s32)); + offset += sizeof(s32); + memcpy(&data->buffer.buf[offset], &comp_temp, sizeof(s32)); - iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data, + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, iio_get_time_ns(indio_dev)); out: @@ -1138,9 +1141,9 @@ static irqreturn_t bme280_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct bmp280_data *data = iio_priv(indio_dev); - u32 adc_temp, adc_press, adc_humidity; - s32 t_fine; - int ret; + u32 adc_temp, adc_press, adc_humidity, comp_press, comp_humidity; + s32 t_fine, comp_temp; + int ret, offset; guard(mutex)(&data->lock); @@ -1159,7 +1162,7 @@ static irqreturn_t bme280_trigger_handler(int irq, void *p) goto out; } - data->sensor_data[1] = bmp280_compensate_temp(data, adc_temp); + comp_temp = bmp280_compensate_temp(data, adc_temp); /* Pressure calculations */ adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0])); @@ -1169,8 +1172,7 @@ static irqreturn_t bme280_trigger_handler(int irq, void *p) } t_fine = bmp280_calc_t_fine(data, adc_temp); - - data->sensor_data[0] = bmp280_compensate_press(data, adc_press, t_fine); + comp_press = bmp280_compensate_press(data, adc_press, t_fine); /* Humidity calculations */ adc_humidity = get_unaligned_be16(&data->buf[6]); @@ -1179,9 +1181,16 @@ static irqreturn_t bme280_trigger_handler(int irq, void *p) dev_err(data->dev, "reading humidity skipped\n"); goto out; } - data->sensor_data[2] = bme280_compensate_humidity(data, adc_humidity, t_fine); - iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data, + comp_humidity = bme280_compensate_humidity(data, adc_humidity, t_fine); + + memcpy(&data->buffer.buf[offset], &comp_press, sizeof(s32)); + offset += sizeof(s32); + memcpy(&data->buffer.buf[offset], &comp_temp, sizeof(s32)); + offset += sizeof(s32); + memcpy(&data->buffer.buf[offset], &comp_humidity, sizeof(s32)); + + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, iio_get_time_ns(indio_dev)); out: @@ -1618,9 +1627,9 @@ static irqreturn_t bmp380_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct bmp280_data *data = iio_priv(indio_dev); - u32 adc_temp, adc_press; - s32 t_fine; - int ret; + u32 adc_temp, adc_press, comp_press; + s32 t_fine, comp_temp; + int ret, offset; guard(mutex)(&data->lock); @@ -1639,7 +1648,7 @@ static irqreturn_t bmp380_trigger_handler(int irq, void *p) goto out; } - data->sensor_data[1] = bmp380_compensate_temp(data, adc_temp); + comp_temp = bmp380_compensate_temp(data, adc_temp); /* Pressure calculations */ adc_press = get_unaligned_le24(&data->buf[0]); @@ -1649,10 +1658,13 @@ static irqreturn_t bmp380_trigger_handler(int irq, void *p) } t_fine = bmp380_calc_t_fine(data, adc_temp); + comp_press = bmp380_compensate_press(data, adc_press, t_fine); - data->sensor_data[0] = bmp380_compensate_press(data, adc_press, t_fine); + memcpy(&data->buffer.buf[offset], &comp_press, sizeof(s32)); + offset += sizeof(s32); + memcpy(&data->buffer.buf[offset], &comp_temp, sizeof(s32)); - iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data, + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, iio_get_time_ns(indio_dev)); out: @@ -2199,7 +2211,7 @@ static irqreturn_t bmp580_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct bmp280_data *data = iio_priv(indio_dev); - int ret; + int ret, offset; guard(mutex)(&data->lock); @@ -2211,13 +2223,16 @@ static irqreturn_t bmp580_trigger_handler(int irq, void *p) goto out; } + /* Pressure calculations */ + memcpy(&data->buffer.buf[offset], &data->buf[3], 3); + + offset += sizeof(s32); + /* Temperature calculations */ - memcpy(&data->sensor_data[1], &data->buf[0], 3); + memcpy(&data->buffer.buf[offset], &data->buf[0], 3); - /* Pressure calculations */ - memcpy(&data->sensor_data[0], &data->buf[3], 3); - iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data, + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, iio_get_time_ns(indio_dev)); out: @@ -2523,23 +2538,24 @@ static irqreturn_t bmp180_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct bmp280_data *data = iio_priv(indio_dev); - int ret, chan_value; + int ret, comp_temp, comp_press, offset; guard(mutex)(&data->lock); - ret = bmp180_read_temp(data, &chan_value); + ret = bmp180_read_temp(data, &comp_temp); if (ret) goto out; - data->sensor_data[1] = chan_value; - ret = bmp180_read_press(data, &chan_value); + ret = bmp180_read_press(data, &comp_press); if (ret) goto out; - data->sensor_data[0] = chan_value; + memcpy(&data->buffer.buf[offset], &comp_press, sizeof(s32)); + offset += sizeof(s32); + memcpy(&data->buffer.buf[offset], &comp_temp, sizeof(s32)); - iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data, + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, iio_get_time_ns(indio_dev)); out: diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h index a9f220c1f77a..b0c26f55c6af 100644 --- a/drivers/iio/pressure/bmp280.h +++ b/drivers/iio/pressure/bmp280.h @@ -419,7 +419,10 @@ struct bmp280_data { * Data to push to userspace triggered buffer. Up to 3 channels and * s64 timestamp, aligned. */ - s32 sensor_data[6] __aligned(8); + struct { + u8 buf[12]; + aligned_s64 ts; + } buffer; /* * DMA (thus cache coherency maintenance) may require the