[PATCH v4] iio: ti-ads7138: Disable STATS_EN bit while reading conversion results

[Paul Geurts <paul.geurts@prodrive-technologies.com>]

There is a data race in reading the STATS registers, resulting in wrong
data being read. When the data in the RECENT register switches between
0x24F0 and 0x2500, occasionally value 0x2400 or 0x25F0 is read. This
happens when the value is updated inbetween reading MSB and LSB.

The datasheet says: "Until a new conversion result is available,
previous values can be read from the statistics registers. Before
reading the statistics registers, set STATS_EN to 0 to prevent any
updates to this register block." As the STATS_EN is currently not
cleared, the values of the stats registers might change mid read,
giving faulty values.

Disable the STATS_EN bit before reading one of the stistics registers to
make sure the device does not update the register mid read. This is
applicable to registers MAX_CHn_xSB, MIN_CHn_xSB and RECENT_CHn_xSB.

This means reading one of the statistics registers resets the MAX and
MIN registers. This is unfortunate, but necessary to get correct data
from the device.

Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com>
Fixes: 93a39542d3c3 ("iio: adc: Add driver for ADS7128 / ADS7138")
---

V1 -> V2: Checked return values and prefixed iio: in commit msg
V2 -> V3:
	- Clarified commit msg
	- Disable STATS_EN for MIN and MAX too
V3 -> V4:
	- Clarified commit msg more
	- Reduced code duplication by creating a statistics read wrapper
	  around read_block

v1: https://lore.kernel.org/all/20260619075646.4100193-1-paul.geurts@prodrive-technologies.com/
v2: https://lore.kernel.org/all/20260619090004.355053-1-paul.geurts@prodrive-technologies.com/
v3: https://lore.kernel.org/all/20260624080131.3669357-1-paul.geurts@prodrive-technologies.com/
---
 drivers/iio/adc/ti-ads7138.c | 40 ++++++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/adc/ti-ads7138.c b/drivers/iio/adc/ti-ads7138.c
index af87f5f19a0f..14096bf3373a 100644
--- a/drivers/iio/adc/ti-ads7138.c
+++ b/drivers/iio/adc/ti-ads7138.c
@@ -227,6 +227,25 @@ static int ads7138_osr_to_bits(int osr)
 	return -EINVAL;
 }
 
+static int ads7138_read_statistics(const struct i2c_client *client, u8 reg,
+				   u8 *out_values, u8 length)
+{
+	int ret;
+
+	/* Disable statistics update so the value is not updated mid read */
+	ret = ads7138_i2c_clear_bit(client, ADS7138_REG_GENERAL_CFG,
+				    ADS7138_GENERAL_CFG_STATS_EN);
+	if (ret)
+		return ret;
+	ret = ads7138_i2c_read_block(client, reg, out_values, length);
+	if (ret)
+		return ret;
+	/* Enable statistics update after read */
+	ret = ads7138_i2c_set_bit(client, ADS7138_REG_GENERAL_CFG,
+				  ADS7138_GENERAL_CFG_STATS_EN);
+	return ret;
+}
+
 static int ads7138_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan, int *val,
 			    int *val2, long mask)
@@ -236,28 +255,31 @@ static int ads7138_read_raw(struct iio_dev *indio_dev,
 	u8 values[2];
 
 	switch (mask) {
+	/* Reading the statistics registers reinitializes them. This is unfortunate
+	 * but necessary to prevent data races
+	 */
 	case IIO_CHAN_INFO_RAW:
-		ret = ads7138_i2c_read_block(data->client,
-					     ADS7138_REG_RECENT_LSB_CH(chan->channel),
-					     values, ARRAY_SIZE(values));
+		ret = ads7138_read_statistics(data->client,
+					      ADS7138_REG_RECENT_LSB_CH(chan->channel),
+					      values, ARRAY_SIZE(values));
 		if (ret)
 			return ret;
 
 		*val = get_unaligned_le16(values);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_PEAK:
-		ret = ads7138_i2c_read_block(data->client,
-					     ADS7138_REG_MAX_LSB_CH(chan->channel),
-					     values, ARRAY_SIZE(values));
+		ret = ads7138_read_statistics(data->client,
+					      ADS7138_REG_MAX_LSB_CH(chan->channel),
+					      values, ARRAY_SIZE(values));
 		if (ret)
 			return ret;
 
 		*val = get_unaligned_le16(values);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_TROUGH:
-		ret = ads7138_i2c_read_block(data->client,
-					     ADS7138_REG_MIN_LSB_CH(chan->channel),
-					     values, ARRAY_SIZE(values));
+		ret = ads7138_read_statistics(data->client,
+					      ADS7138_REG_MIN_LSB_CH(chan->channel),
+					      values, ARRAY_SIZE(values));
 		if (ret)
 			return ret;
 
-- 
2.39.2