linux-kernel - [PATCH v3 03/10] iio: adc: ad4170: Add support for calibration gain

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Message-ID: <3d255162174ab160c3fd06af3c27360947c2a566.1747083143.git.marcelo.schmitt@analog.com>
Date: Tue, 13 May 2025 09:34:20 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <jic23@...nel.org>, <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <dlechner@...libre.com>, <nuno.sa@...log.com>, <andy@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linus.walleij@...aro.org>, <brgl@...ev.pl>,
        <marcelo.schmitt1@...il.com>
Subject: [PATCH v3 03/10] iio: adc: ad4170: Add support for calibration gain

Add support for ADC calibration gain configuration.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
Change log v2 -> v3
- New patch spun out of the base driver patch.

 drivers/iio/adc/ad4170.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad4170.c b/drivers/iio/adc/ad4170.c
index bf19b31095ee..1df214f7fdec 100644
--- a/drivers/iio/adc/ad4170.c
+++ b/drivers/iio/adc/ad4170.c
@@ -642,7 +642,8 @@ static const struct iio_chan_spec ad4170_channel_template = {
 	.differential = 1,
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 			      BIT(IIO_CHAN_INFO_SCALE) |
-			      BIT(IIO_CHAN_INFO_OFFSET),
+			      BIT(IIO_CHAN_INFO_OFFSET) |
+			      BIT(IIO_CHAN_INFO_CALIBSCALE),
 	.info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE),
 	.scan_type = {
 		.realbits = 24,
@@ -953,6 +954,9 @@ static int ad4170_read_raw(struct iio_dev *indio_dev,
 		pga = FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe);
 		*val = chan_info->offset_tbl[pga];
 		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_CALIBSCALE:
+		*val = setup->gain;
+		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
 	}
@@ -1079,6 +1083,25 @@ static int ad4170_set_pga(struct ad4170_state *st,
 	return 0;
 }
 
+static int ad4170_set_calib_gain(struct ad4170_state *st,
+				 struct iio_chan_spec const *chan, int val)
+{
+	struct ad4170_chan_info *chan_info = &st->chan_infos[chan->address];
+	struct ad4170_setup *setup = &chan_info->setup;
+	u32 old_gain;
+	int ret;
+
+	guard(mutex)(&st->lock);
+	old_gain = setup->gain;
+	setup->gain = val;
+
+	ret = ad4170_write_channel_setup(st, chan->address, false);
+	if (ret)
+		setup->gain = old_gain;
+
+	return ret;
+}
+
 static int __ad4170_write_raw(struct iio_dev *indio_dev,
 			      struct iio_chan_spec const *chan, int val,
 			      int val2, long info)
@@ -1088,6 +1111,8 @@ static int __ad4170_write_raw(struct iio_dev *indio_dev,
 	switch (info) {
 	case IIO_CHAN_INFO_SCALE:
 		return ad4170_set_pga(st, chan, val, val2);
+	case IIO_CHAN_INFO_CALIBSCALE:
+		return ad4170_set_calib_gain(st, chan, val);
 	default:
 		return -EINVAL;
 	}
@@ -1114,6 +1139,8 @@ static int ad4170_write_raw_get_fmt(struct iio_dev *indio_dev,
 	switch (info) {
 	case IIO_CHAN_INFO_SCALE:
 		return IIO_VAL_INT_PLUS_NANO;
+	case IIO_CHAN_INFO_CALIBSCALE:
+		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
 	}
-- 
2.47.2