staging:iio:adc:ad7993 stop reading from buffer for sysfs raw read.

No known usecase and makes in kernel interface work more complex.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index b2dedb2..4047c5d 100644 (file)
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -316,25 +316,6 @@ out:
        return ret;
 }
 
-static int ad7793_scan_from_ring(struct ad7793_state *st, unsigned ch, int *val)
-{
-       struct iio_buffer *ring = iio_priv_to_dev(st)->buffer;
-       int ret;
-       s64 dat64[2];
-       u32 *dat32 = (u32 *)dat64;
-
-       if (!(test_bit(ch, ring->scan_mask)))
-               return  -EBUSY;
-
-       ret = ring->access->read_last(ring, (u8 *) &dat64);
-       if (ret)
-               return ret;
-
-       *val = *dat32;
-
-       return 0;
-}
-
 static int ad7793_ring_preenable(struct iio_dev *indio_dev)
 {
        struct ad7793_state *st = iio_priv(indio_dev);
@@ -650,8 +631,7 @@ static int ad7793_read_raw(struct iio_dev *indio_dev,
        case 0:
                mutex_lock(&indio_dev->mlock);
                if (iio_buffer_enabled(indio_dev))
-                       ret = ad7793_scan_from_ring(st,
-                                       chan->scan_index, &smpl);
+                       ret = -EBUSY;
                else
                        ret = ad7793_read(st, chan->address,
                                        chan->scan_type.realbits / 8, &smpl);