[PATCH v2 2/8] iio: adc: ad7124: Add update_scan_mode

alexandru.tachici
2022-03-18T16:18:02Z

The callback .set_channel cannot be used to enable
and disable multiple channels at once as they are
presented in the active_scan_mask.

By adding an update_scan_mode callback, every time the
continuous mode is activated, channels will be enabled/disabled
accordingly.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
---
drivers/iio/adc/ad7124.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 7249db2c4422..428ec3e257d7 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -669,11 +669,32 @@ 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)
+{
+ struct ad7124_state *st = iio_priv(indio_dev);
+ bool bit_set;
+ int ret;
+ int i;
+
+ for (i = 0; i < st->num_channels; i++) {
+ bit_set = test_bit(i, scan_mask);
+ ret = ad7124_spi_write_mask(st, AD7124_CHANNEL(i),
+ AD7124_CHANNEL_EN_MSK,
+ AD7124_CHANNEL_EN(bit_set),
+ 2);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
static const struct iio_info ad7124_info = {
.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,
};

--
2.25.1