linux-kernel - [PATCH v3 1/1] iio/scmi: Add reading "raw" attribute.

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Date:   Tue, 28 Sep 2021 19:19:57 +0300
From:   Andriy Tryshnivskyy <andriy.tryshnivskyy@...nsynergy.com>
To:     jbhayana@...gle.com, jic23@...nel.org
Cc:     lars@...afoo.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vasyl.Vavrychuk@...nsynergy.com,
        andriy.tryshnivskyy@...nsynergy.com
Subject: [PATCH v3 1/1] iio/scmi: Add reading "raw" attribute.

Add IIO_CHAN_INFO_RAW to the mask and implement corresponding
reading "raw" attribute in scmi_iio_read_raw.

Signed-off-by: Andriy Tryshnivskyy <andriy.tryshnivskyy@...nsynergy.com>
---
 drivers/iio/common/scmi_sensors/scmi_iio.c | 45 +++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/common/scmi_sensors/scmi_iio.c b/drivers/iio/common/scmi_sensors/scmi_iio.c
index 7cf2bf282cef..7ea52186ad50 100644
--- a/drivers/iio/common/scmi_sensors/scmi_iio.c
+++ b/drivers/iio/common/scmi_sensors/scmi_iio.c
@@ -286,6 +286,9 @@ static int scmi_iio_read_raw(struct iio_dev *iio_dev,
 	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
 	s8 scale;
 	int ret;
+	int err;
+	u32 sensor_config;
+	struct scmi_sensor_reading readings[SCMI_IIO_NUM_OF_AXIS];
 
 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
@@ -300,6 +303,45 @@ static int scmi_iio_read_raw(struct iio_dev *iio_dev,
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		ret = scmi_iio_get_odr_val(iio_dev, val, val2);
 		return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_RAW:
+		sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+					   SCMI_SENS_CFG_SENSOR_ENABLE);
+		err = sensor->sensor_ops->config_set(
+			sensor->ph, sensor->sensor_info->id, sensor_config);
+		if (err) {
+			dev_err(&iio_dev->dev,
+				"Error in enabling sensor %s err %d",
+				sensor->sensor_info->name, err);
+			return err;
+		}
+
+		err = sensor->sensor_ops->reading_get_timestamped(
+			sensor->ph, sensor->sensor_info->id,
+			sensor->sensor_info->num_axis, readings);
+		if (err) {
+			dev_err(&iio_dev->dev,
+				"Error in reading raw attribute for sensor %s err %d",
+				sensor->sensor_info->name, err);
+			return err;
+		}
+
+		sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+					   SCMI_SENS_CFG_SENSOR_DISABLE);
+		err = sensor->sensor_ops->config_set(
+			sensor->ph, sensor->sensor_info->id, sensor_config);
+		if (err) {
+			dev_err(&iio_dev->dev,
+				"Error in enabling sensor %s err %d",
+				sensor->sensor_info->name, err);
+			return err;
+		}
+		/* Check if raw value fits 32 bits */
+		if (readings[ch->scan_index].value < INT_MIN ||
+		    readings[ch->scan_index].value > INT_MAX)
+			return -ERANGE;
+		/* Use 32-bit value, since practically there is no need in 64 bits */
+		*val = (int)readings[ch->scan_index].value;
+		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
 	}
@@ -381,7 +423,8 @@ static void scmi_iio_set_data_channel(struct iio_chan_spec *iio_chan,
 	iio_chan->type = type;
 	iio_chan->modified = 1;
 	iio_chan->channel2 = mod;
-	iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_SCALE);
+	iio_chan->info_mask_separate =
+		BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_RAW);
 	iio_chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ);
 	iio_chan->info_mask_shared_by_type_available =
 		BIT(IIO_CHAN_INFO_SAMP_FREQ);
-- 
2.17.1