linux-kernel - [PATCH v3 8/9] iio: accel: bma400: Add debugfs register access support

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Message-Id: <20220411203133.19929-9-jagathjog1996@gmail.com>
Date:   Tue, 12 Apr 2022 02:01:32 +0530
From:   Jagath Jog J <jagathjog1996@...il.com>
To:     dan@...obertson.com, jic23@...nel.org, andy.shevchenko@...il.com
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 8/9] iio: accel: bma400: Add debugfs register access support

Add support to read/write byte from/to bma400 device from the userspace
using debugfs interface.

Signed-off-by: Jagath Jog J <jagathjog1996@...il.com>
---
 drivers/iio/accel/bma400_core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c
index 69d2caa4ed18..b6c79cfabaa4 100644
--- a/drivers/iio/accel/bma400_core.c
+++ b/drivers/iio/accel/bma400_core.c
@@ -1028,6 +1028,23 @@ static int bma400_write_event_config(struct iio_dev *indio_dev,
 	}
 }
 
+static int bma400_debugfs_reg_access(struct iio_dev *indio_dev,
+				     unsigned int reg,
+				     unsigned int writeval,
+				     unsigned int *readval)
+{
+	struct bma400_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+	if (readval)
+		ret = regmap_read(data->regmap, reg, readval);
+	else
+		ret = regmap_write(data->regmap, reg, writeval);
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+
 static int bma400_data_rdy_trigger_set_state(struct iio_trigger *trig,
 					     bool state)
 {
@@ -1058,6 +1075,7 @@ static const struct iio_info bma400_info = {
 	.write_raw_get_fmt = bma400_write_raw_get_fmt,
 	.read_event_config = bma400_read_event_config,
 	.write_event_config = bma400_write_event_config,
+	.debugfs_reg_access = bma400_debugfs_reg_access,
 };
 
 static const struct iio_trigger_ops bma400_trigger_ops = {
-- 
2.17.1