iio: adc: ad7173: Grab direct mode for calibration

While a calibration is running, better don't make the device do anything
else.

To enforce that, grab direct mode during calibration.

Fixes: 031bdc8aee01 ("iio: adc: ad7173: add calibration support")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/8319fa2dc881c9899d60db4eba7fe8e984716617.1740655250.git.u.kleine-koenig@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index ca2b41b16cc9d61bd01a3540a475dec408ee5a06..9ac8ea3cb4997847ecc7b8c1361f499b0facbb2f 100644 (file)
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -345,6 +345,9 @@ static ssize_t ad7173_write_syscalib(struct iio_dev *indio_dev,
        if (ret)
                return ret;
 
+       if (!iio_device_claim_direct(indio_dev))
+               return -EBUSY;
+
        mode = st->channels[chan->channel].syscalib_mode;
        if (sys_calib) {
                if (mode == AD7173_SYSCALIB_ZERO_SCALE)
@@ -355,6 +358,8 @@ static ssize_t ad7173_write_syscalib(struct iio_dev *indio_dev,
                                              chan->address);
        }
 
+       iio_device_release_direct(indio_dev);
+
        return ret ? : len;
 }