linux-kernel - [PATCH v3 4/6] iio: pressure: Add SCALE and RAW values for channels

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Message-Id: <20240319002925.2121016-5-vassilisamir@gmail.com>
Date: Tue, 19 Mar 2024 01:29:23 +0100
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: jic23@...nel.org
Cc: lars@...afoo.de,
	andriy.shevchenko@...ux.intel.com,
	ang.iglesiasg@...il.com,
	mazziesaccount@...il.com,
	ak@...klinger.de,
	petre.rodan@...dimension.ro,
	phil@...pberrypi.com,
	579lpy@...il.com,
	linus.walleij@...aro.org,
	semen.protsenko@...aro.org,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Vasileios Amoiridis <vassilisamir@...il.com>
Subject: [PATCH v3 4/6] iio: pressure: Add SCALE and RAW values for channels

Add extra IIO_CHAN_INFO_SCALE and IIO_CHAN_INFO_RAW in order to be
able to calculate the processed value with standard userspace IIO
tools. Can be used for triggered buffers as well.

Even though it is not a good design choice to have SCALE, RAW and
PROCESSED together, the PROCESSED channel is kept for ABI compatibility.

Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
---
 drivers/iio/pressure/bmp280-core.c | 63 ++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 6d6173c4b744..312bc2617583 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -137,17 +137,26 @@ enum {
 static const struct iio_chan_spec bmp280_channels[] = {
 	{
 		.type = IIO_PRESSURE,
+		/* PROCESSED maintained for ABI backwards compatibility */
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 	},
 	{
 		.type = IIO_TEMP,
+		/* PROCESSED maintained for ABI backwards compatibility */
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 	},
 	{
 		.type = IIO_HUMIDITYRELATIVE,
+		/* PROCESSED maintained for ABI backwards compatibility */
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 	},
 };
@@ -155,21 +164,30 @@ static const struct iio_chan_spec bmp280_channels[] = {
 static const struct iio_chan_spec bmp380_channels[] = {
 	{
 		.type = IIO_PRESSURE,
+		/* PROCESSED maintained for ABI backwards compatibility */
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 					   BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
 	},
 	{
 		.type = IIO_TEMP,
+		/* PROCESSED maintained for ABI backwards compatibility */
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 					   BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
 	},
 	{
 		.type = IIO_HUMIDITYRELATIVE,
+		/* PROCESSED maintained for ABI backwards compatibility */
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 					   BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
@@ -487,6 +505,51 @@ static int bmp280_read_raw_guarded(struct iio_dev *indio_dev,
 			return -EINVAL;
 		}
 		return 0;
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_HUMIDITYRELATIVE:
+			ret = data->chip_info->read_humid(data, &chan_value);
+			if (ret)
+				return ret;
+
+			*val = chan_value;
+			return IIO_VAL_INT;
+		case IIO_PRESSURE:
+			ret = data->chip_info->read_press(data, &chan_value);
+			if (ret)
+				return ret;
+
+			*val = chan_value;
+			return IIO_VAL_INT;
+		case IIO_TEMP:
+			ret = data->chip_info->read_press(data, &chan_value);
+			if (ret)
+				return ret;
+
+			*val = chan_value;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+		return 0;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_HUMIDITYRELATIVE:
+			*val = data->chip_info->humid_coeffs[0];
+			*val2 = data->chip_info->humid_coeffs[1];
+			return data->chip_info->humid_coeffs_type;
+		case IIO_PRESSURE:
+			*val = data->chip_info->press_coeffs[0];
+			*val2 = data->chip_info->press_coeffs[1];
+			return data->chip_info->press_coeffs_type;
+		case IIO_TEMP:
+			*val = data->chip_info->temp_coeffs[0];
+			*val2 = data->chip_info->temp_coeffs[1];
+			return data->chip_info->temp_coeffs_type;
+		default:
+			return -EINVAL;
+		}
+		return 0;
 	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 		switch (chan->type) {
 		case IIO_HUMIDITYRELATIVE:
-- 
2.25.1