[PATCH v2] iio: imu: inv_mpu6050: add debugfs register r/w interface

[Rohit Sarkar]

The debugfs interface provides direct access to read and write device
registers if debugfs is enabled.

Signed-off-by: Rohit Sarkar <rohitsarkar5398@xxxxxxxxx>
---
Changelog v1->v2
* grab a lock to protect driver state
* add a comma at the end of structure member initialisation

 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 7cb9ff3d3e94..381a3fb09858 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -1248,12 +1248,31 @@ static const struct attribute_group inv_attribute_group = {
 	.attrs = inv_attributes
 };
 
+static int inv_mpu6050_reg_access(struct iio_dev *indio_dev,
+				  unsigned int reg,
+				  unsigned int writeval,
+				  unsigned int *readval)
+{
+	struct inv_mpu6050_state *st = iio_priv(indio_dev);
+	int ret = 0;
+
+	mutex_lock(&st->lock);
+	if (readval)
+		ret = regmap_read(st->map, reg, readval);
+	else
+		ret = regmap_write(st->map, reg, writeval);
+	mutex_unlock(&st->lock);
+
+	return ret;
+}
+
 static const struct iio_info mpu_info = {
 	.read_raw = &inv_mpu6050_read_raw,
 	.write_raw = &inv_mpu6050_write_raw,
 	.write_raw_get_fmt = &inv_write_raw_get_fmt,
 	.attrs = &inv_attribute_group,
 	.validate_trigger = inv_mpu6050_validate_trigger,
+	.debugfs_reg_access = &inv_mpu6050_reg_access,
 };
 
 /**
-- 
2.23.0.385.gbc12974a89