linux-kernel - [PATCH 2/6] iio: adc: ad7124: use read_avail() for scale

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Message-Id: <20250905-iio-adc-ad7124-add-filter-support-v1-2-aee3834be6a9@baylibre.com>
Date: Fri, 05 Sep 2025 13:11:57 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH 2/6] iio: adc: ad7124: use read_avail() for scale_available

Replace custom attribute with the standard IIO read_avail() callback
to provide in_voltage_scale_available attribute.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad7124.c | 42 +++++++++++++++++++++++++++++-------------
 1 file changed, 29 insertions(+), 13 deletions(-)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 117777fc8ad05b773da09c113cf84927c75d6b7b..6c17cc59f33c6ddc241e94d1b0f43bceced1e719 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -623,6 +623,33 @@ static const struct ad_sigma_delta_info ad7124_sigma_delta_info = {
 	.num_resetclks = 64,
 };
 
+static const int ad7124_voltage_scales[][2] = {
+	{ 0, 1164 },
+	{ 0, 2328 },
+	{ 0, 4656 },
+	{ 0, 9313 },
+	{ 0, 18626 },
+	{ 0, 37252 },
+	{ 0, 74505 },
+	{ 0, 149011 },
+	{ 0, 298023 },
+};
+
+static int ad7124_read_avail(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     const int **vals, int *type, int *length, long info)
+{
+	switch (info) {
+	case IIO_CHAN_INFO_SCALE:
+		*vals = (const int *)ad7124_voltage_scales;
+		*type = IIO_VAL_INT_PLUS_NANO;
+		*length = ARRAY_SIZE(ad7124_voltage_scales) * 2;
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int ad7124_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val, int *val2, long info)
@@ -777,18 +804,6 @@ static int ad7124_reg_access(struct iio_dev *indio_dev,
 	return ret;
 }
 
-static IIO_CONST_ATTR(in_voltage_scale_available,
-	"0.000001164 0.000002328 0.000004656 0.000009313 0.000018626 0.000037252 0.000074505 0.000149011 0.000298023");
-
-static struct attribute *ad7124_attributes[] = {
-	&iio_const_attr_in_voltage_scale_available.dev_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group ad7124_attrs_group = {
-	.attrs = ad7124_attributes,
-};
-
 static int ad7124_update_scan_mode(struct iio_dev *indio_dev,
 				   const unsigned long *scan_mask)
 {
@@ -818,12 +833,12 @@ static int ad7124_update_scan_mode(struct iio_dev *indio_dev,
 }
 
 static const struct iio_info ad7124_info = {
+	.read_avail = ad7124_read_avail,
 	.read_raw = ad7124_read_raw,
 	.write_raw = ad7124_write_raw,
 	.debugfs_reg_access = &ad7124_reg_access,
 	.validate_trigger = ad_sd_validate_trigger,
 	.update_scan_mode = ad7124_update_scan_mode,
-	.attrs = &ad7124_attrs_group,
 };
 
 /* Only called during probe, so dev_err_probe() can be used */
@@ -1013,6 +1028,7 @@ static const struct iio_chan_spec ad7124_channel_template = {
 		BIT(IIO_CHAN_INFO_OFFSET) |
 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE),
 	.scan_type = {
 		.sign = 'u',
 		.realbits = 24,

-- 
2.43.0