[PATCH 2/2] iio: dac: ad5593r: add check for i2c functionality

[Nuno Sá <nuno.sa@xxxxxxxxxx>]

Make sure that the needed i2c functionality is supported during probe.

Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
---
 drivers/iio/dac/ad5593r.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/dac/ad5593r.c b/drivers/iio/dac/ad5593r.c
index 43ee4efb250c..f09433e298db 100644
--- a/drivers/iio/dac/ad5593r.c
+++ b/drivers/iio/dac/ad5593r.c
@@ -98,6 +98,10 @@ static const struct ad5592r_rw_ops ad5593r_rw_ops = {
 static int ad5593r_i2c_probe(struct i2c_client *i2c,
 		const struct i2c_device_id *id)
 {
+	if (!i2c_check_functionality(i2c->adapter,
+				     I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
+		return -EOPNOTSUPP;
+
 	return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
 }
 
-- 
2.37.3