iio: adc: ad7606: Add debug mode for ad7616

Support for register access was added for devices which have software
mode.
Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ad7606.c

@@ -60,6 +60,29 @@ static int ad7606_reset(struct ad7606_state *st)
 	return -ENODEV;
 }
 
+static int ad7606_reg_access(struct iio_dev *indio_dev,
+			     unsigned int reg,
+			     unsigned int writeval,
+			     unsigned int *readval)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->lock);
+	if (readval) {
+		ret = st->bops->reg_read(st, reg);
+		if (ret < 0)
+			goto err_unlock;
+		*readval = ret;
+		ret = 0;
+	} else {
+		ret = st->bops->reg_write(st, reg, writeval);
+	}
+err_unlock:
+	mutex_unlock(&st->lock);
+	return ret;
+}
+
 static int ad7606_read_samples(struct ad7606_state *st)
 {
 	unsigned int num = st->chip_info->num_channels;
@@ -501,6 +524,14 @@ static const struct iio_info ad7606_info_os_and_range = {
 	.validate_trigger = &ad7606_validate_trigger,
 };
 
+static const struct iio_info ad7606_info_os_range_and_debug = {
+	.read_raw = &ad7606_read_raw,
+	.write_raw = &ad7606_write_raw,
+	.debugfs_reg_access = &ad7606_reg_access,
+	.attrs = &ad7606_attribute_group_os_and_range,
+	.validate_trigger = &ad7606_validate_trigger,
+};
+
 static const struct iio_info ad7606_info_os = {
 	.read_raw = &ad7606_read_raw,
 	.write_raw = &ad7606_write_raw,
@@ -617,7 +648,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 
 		/* After reset, in software mode, ±10 V is set by default */
 		memset32(st->range, 2, ARRAY_SIZE(st->range));
-		indio_dev->info = &ad7606_info_os_and_range;
+		indio_dev->info = &ad7606_info_os_range_and_debug;
 
 		ret = st->bops->sw_mode_config(indio_dev);
 		if (ret < 0)