linux-kernel - [PATCH 3/3] iio: gyro: adxrs290: Add debugfs register access support

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Message-Id: <20200825124711.11455-4-nish.malpani25@gmail.com>
Date:   Tue, 25 Aug 2020 18:17:11 +0530
From:   Nishant Malpani <nish.malpani25@...il.com>
To:     jic23@...nel.org, robh+dt@...nel.org
Cc:     dragos.bogdan@...log.com, darius.berghe@...log.com,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org,
        Nishant Malpani <nish.malpani25@...il.com>
Subject: [PATCH 3/3] iio: gyro: adxrs290: Add debugfs register access support

Extend support to read/write byte data from/to the device using
debugfs iio interface.

Signed-off-by: Nishant Malpani <nish.malpani25@...il.com>
---
 drivers/iio/gyro/adxrs290.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iio/gyro/adxrs290.c b/drivers/iio/gyro/adxrs290.c
index 25046590761e..b0050cdd2b90 100644
--- a/drivers/iio/gyro/adxrs290.c
+++ b/drivers/iio/gyro/adxrs290.c
@@ -435,6 +435,24 @@ static int adxrs290_read_avail(struct iio_dev *indio_dev,
 	}
 }
 
+static int adxrs290_reg_access(struct iio_dev *indio_dev, unsigned int reg,
+			       unsigned int writeval, unsigned int *readval)
+{
+	struct adxrs290_state *st = iio_priv(indio_dev);
+	int ret;
+
+	if (!readval)
+		return adxrs290_spi_write_reg(st->spi, reg, writeval);
+
+	ret = spi_w8r8(st->spi, ADXRS290_READ_REG(reg));
+	if (ret < 0)
+		return ret;
+
+	*readval = ret;
+
+	return 0;
+}
+
 static int adxrs290_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state)
 {
 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
@@ -547,6 +565,7 @@ static const struct iio_info adxrs290_info = {
 	.read_raw = &adxrs290_read_raw,
 	.write_raw = &adxrs290_write_raw,
 	.read_avail = &adxrs290_read_avail,
+	.debugfs_reg_access = &adxrs290_reg_access,
 };
 
 static int adxrs290_probe_trigger(struct iio_dev *indio_dev)
-- 
2.20.1