staging:iio:adc:ad799x avoid bouncing back and forth from iio_priv space.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/ad799x.h

@@ -124,11 +124,11 @@ struct ad799x_platform_data {
 int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask);
 
 #ifdef CONFIG_AD799X_RING_BUFFER
-int ad799x_single_channel_from_ring(struct ad799x_state *st, int channum);
+int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum);
 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
 void ad799x_ring_cleanup(struct iio_dev *indio_dev);
 #else /* CONFIG_AD799X_RING_BUFFER */
-int ad799x_single_channel_from_ring(struct ad799x_state *st, int channum)
+int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum)
 {
 	return -EINVAL;
 }

drivers/staging/iio/adc/ad799x_core.c

@@ -150,7 +150,7 @@ static int ad799x_read_raw(struct iio_dev *dev_info,
 	case 0:
 		mutex_lock(&dev_info->mlock);
 		if (iio_buffer_enabled(dev_info))
-			ret = ad799x_single_channel_from_ring(st,
+			ret = ad799x_single_channel_from_ring(dev_info,
 							      chan->scan_index);
 		else
 			ret = ad799x_scan_direct(st, chan->address);

drivers/staging/iio/adc/ad799x_ring.c

@@ -23,9 +23,9 @@
 
 #include "ad799x.h"
 
-int ad799x_single_channel_from_ring(struct ad799x_state *st, int channum)
+int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum)
 {
-	struct iio_buffer *ring = iio_priv_to_dev(st)->buffer;
+	struct iio_buffer *ring = indio_dev->buffer;
 	int count = 0, ret;
 	u16 *ring_data;