[RFC PATCH 15/27] iio: adc: ad7779: Stop using iio_device_claim_direct_scoped()

[Jonathan Cameron <jic23@xxxxxxxxxx>]

From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

This complex cleanup.h use case of conditional guards has proved
to be more trouble that it is worth in terms of false positive compiler
warnings and hard to read code.

Move directly to the new claim/release_direct() that allow sparse
to check for unbalanced context.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
 drivers/iio/adc/ad7779.c | 103 ++++++++++++++++++++++++---------------
 1 file changed, 63 insertions(+), 40 deletions(-)

diff --git a/drivers/iio/adc/ad7779.c b/drivers/iio/adc/ad7779.c
index 2537dab69a35..3b132665d24c 100644
--- a/drivers/iio/adc/ad7779.c
+++ b/drivers/iio/adc/ad7779.c
@@ -467,65 +467,88 @@ static int ad7779_set_calibbias(struct ad7779_state *st, int channel, int val)
 				calibbias[2]);
 }
 
+static int __ad7779_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan, int *val,
+			     int *val2, long mask)
+{
+	struct ad7779_state *st = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBSCALE:
+		ret = ad7779_get_calibscale(st, chan->channel);
+		if (ret < 0)
+			return ret;
+		*val = ret;
+		*val2 = GAIN_REL;
+		return IIO_VAL_FRACTIONAL;
+	case IIO_CHAN_INFO_CALIBBIAS:
+		ret = ad7779_get_calibbias(st, chan->channel);
+		if (ret < 0)
+			return ret;
+		*val = ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = st->sampling_freq;
+		if (*val < 0)
+			return -EINVAL;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int ad7779_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan, int *val,
 			   int *val2, long mask)
 {
-	struct ad7779_state *st = iio_priv(indio_dev);
 	int ret;
 
-	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
-		switch (mask) {
-		case IIO_CHAN_INFO_CALIBSCALE:
-			ret = ad7779_get_calibscale(st, chan->channel);
-			if (ret < 0)
-				return ret;
-			*val = ret;
-			*val2 = GAIN_REL;
-			return IIO_VAL_FRACTIONAL;
-		case IIO_CHAN_INFO_CALIBBIAS:
-			ret = ad7779_get_calibbias(st, chan->channel);
-			if (ret < 0)
-				return ret;
-			*val = ret;
-			return IIO_VAL_INT;
-		case IIO_CHAN_INFO_SAMP_FREQ:
-			*val = st->sampling_freq;
-			if (*val < 0)
-				return -EINVAL;
-			return IIO_VAL_INT;
-		default:
-			return -EINVAL;
-		}
+	if (!iio_device_claim_direct(indio_dev))
+		return -EBUSY;
+
+	ret = __ad7779_read_raw(indio_dev, chan, val, val2, mask);
+	iio_device_release_direct(indio_dev);
+	return ret;
+}
+
+static int __ad7779_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val, int val2,
+			      long mask)
+{
+	struct ad7779_state *st = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBSCALE:
+		return ad7779_set_calibscale(st, chan->channel, val2);
+	case IIO_CHAN_INFO_CALIBBIAS:
+		return ad7779_set_calibbias(st, chan->channel, val);
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return ad7779_set_sampling_frequency(st, val);
+	default:
+		return -EINVAL;
 	}
-	unreachable();
 }
 
 static int ad7779_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan, int val, int val2,
 			    long mask)
 {
-	struct ad7779_state *st = iio_priv(indio_dev);
+	int ret;
 
-	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
-		switch (mask) {
-		case IIO_CHAN_INFO_CALIBSCALE:
-			return ad7779_set_calibscale(st, chan->channel, val2);
-		case IIO_CHAN_INFO_CALIBBIAS:
-			return ad7779_set_calibbias(st, chan->channel, val);
-		case IIO_CHAN_INFO_SAMP_FREQ:
-			return ad7779_set_sampling_frequency(st, val);
-		default:
-			return -EINVAL;
-		}
-	}
-	unreachable();
+	if (!iio_device_claim_direct(indio_dev))
+		return -EBUSY;
+
+	ret = __ad7779_write_raw(indio_dev, chan, val, val2, mask);
+	iio_device_release_direct(indio_dev);
+	return ret;
 }
 
 static int ad7779_buffer_preenable(struct iio_dev *indio_dev)
 {
-	int ret;
 	struct ad7779_state *st = iio_priv(indio_dev);
+	int ret;
 
 	ret = ad7779_spi_write_mask(st,
 				    AD7779_REG_GENERAL_USER_CONFIG_3,
-- 
2.47.1