[PATCH v1 11/15] iio: adc: ad7768-1: Add reg_write_masked function

From: Jonathan Santos
Date: Tue Jan 07 2025 - 10:27:58 EST


From: Sergiu Cuciurean <sergiu.cuciurean@xxxxxxxxxx>

This commit adds the ad7768_spi_reg_write_masked() which is a helper
function for writing specific bits inside a register, without interfering
with the other bit values.

Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@xxxxxxxxxx>
---
drivers/iio/adc/ad7768-1.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index 574d735f2c3a..675af9ea856d 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -242,6 +242,21 @@ static int ad7768_spi_reg_write(struct ad7768_state *st,
return spi_write(st->spi, st->data.d8, 2);
}

+static int ad7768_spi_reg_write_masked(struct ad7768_state *st,
+ unsigned int addr,
+ unsigned int mask,
+ unsigned int val)
+{
+ unsigned int reg_val;
+ int ret;
+
+ ret = ad7768_spi_reg_read(st, addr, &reg_val, 1);
+ if (ret < 0)
+ return ret;
+
+ return ad7768_spi_reg_write(st, addr, (reg_val & ~mask) | val);
+}
+
static int ad7768_set_mode(struct ad7768_state *st,
enum ad7768_conv_mode mode)
{
--
2.34.1