iio: staging: sca3000: hide stufftoread logic

Change sca3000_ring implementation so that it exports a data_available
function to iio.
Signed-off-by: NJosselin Costanzi <josselin.costanzi@mobile-devices.fr>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/industrialio-buffer.c

@@ -39,10 +39,7 @@ static bool iio_buffer_is_active(struct iio_buffer *buf)
 
 static bool iio_buffer_data_available(struct iio_buffer *buf)
 {
-	if (buf->access->data_available)
-		return buf->access->data_available(buf);
-
-	return buf->stufftoread;
+	return buf->access->data_available(buf);
 }
 
 /**

drivers/staging/iio/accel/sca3000_ring.c

@@ -141,6 +141,11 @@ static int sca3000_ring_get_bytes_per_datum(struct iio_buffer *r)
 	return 6;
 }
 
+static bool sca3000_ring_buf_data_available(struct iio_buffer *r)
+{
+	return r->stufftoread;
+}
+
 static IIO_BUFFER_ENABLE_ATTR;
 static IIO_BUFFER_LENGTH_ATTR;
 
@@ -274,6 +279,7 @@ static const struct iio_buffer_access_funcs sca3000_ring_access_funcs = {
 	.read_first_n = &sca3000_read_first_n_hw_rb,
 	.get_length = &sca3000_ring_get_length,
 	.get_bytes_per_datum = &sca3000_ring_get_bytes_per_datum,
+	.data_available = sca3000_ring_buf_data_available,
 	.release = sca3000_ring_release,
 };