staging:iio:ad2s90: Check channel type at read_raw

This patch adds a channel type check at the beginning of the
ad2s90_read_raw function. Since ad2s90 has only one channel, it just
checks if the given channel is the expected one and if not, return
-EINVAL.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
index 9c168b7410d08e1768d53d9425a1771917ecda39..3e257ac46f7af380289c14f40878dc248f5cc1a4 100644 (file)
--- a/drivers/staging/iio/resolver/ad2s90.c
+++ b/drivers/staging/iio/resolver/ad2s90.c
@@ -34,6 +34,9 @@ static int ad2s90_read_raw(struct iio_dev *indio_dev,
        int ret;
        struct ad2s90_state *st = iio_priv(indio_dev);
 
+       if (chan->type != IIO_ANGL)
+               return -EINVAL;
+
        switch (m) {
        case IIO_CHAN_INFO_SCALE:
                /* 2 * Pi / 2^12 */