staging:iio: Switch the channel masks to bitmaps so as to allow for more channels.

This is as light as possible on changes to current drivers.
Some drivers make assumptions that their masks fit in a single
long.  Given they were previously working this is clearly valid if
not tidy.

The max1363 is an example where there should be no such assumptions.

V2: Add the new ad5933

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>

1 files changed, 5 insertions, 59 deletions

diff --git a/drivers/staging/iio/ring_generic.h b/drivers/staging/iio/ring_generic.h
index 25aacf3..7a47f62 100644
--- a/drivers/staging/iio/ring_generic.h
+++ b/drivers/staging/iio/ring_generic.h
@@ -104,7 +104,7 @@ struct iio_ring_buffer {
 	int					bpe;
 	struct attribute_group			*scan_el_attrs;
 	int					scan_count;
-	unsigned long				scan_mask;
+	long					*scan_mask;
 	bool					scan_timestamp;
 	const struct iio_ring_access_funcs	*access;
 	const struct iio_ring_setup_ops		*setup_ops;
@@ -124,6 +124,8 @@ struct iio_ring_buffer {
 void iio_ring_buffer_init(struct iio_ring_buffer *ring,
 			  struct iio_dev *dev_info);
 
+void iio_ring_buffer_deinit(struct iio_ring_buffer *ring);
+
 /**
  * __iio_update_ring_buffer() - update common elements of ring buffers
  * @ring:		ring buffer that is the event source
@@ -137,70 +139,14 @@ static inline void __iio_update_ring_buffer(struct iio_ring_buffer *ring,
 	ring->length = length;
 }
 
-/*
- * These are mainly provided to allow for a change of implementation if a device
- * has a large number of scan elements
- */
-#define IIO_MAX_SCAN_LENGTH 31
-
-/* note 0 used as error indicator as it doesn't make sense. */
-static inline u32 iio_scan_mask_match(u32 *av_masks, u32 mask)
-{
-	while (*av_masks) {
-		if (!(~*av_masks & mask))
-			return *av_masks;
-		av_masks++;
-	}
-	return 0;
-}
-
-static inline int iio_scan_mask_query(struct iio_ring_buffer *ring, int bit)
-{
-	struct iio_dev *dev_info = ring->indio_dev;
-	u32 mask;
-
-	if (bit > IIO_MAX_SCAN_LENGTH)
-		return -EINVAL;
-
-	if (!ring->scan_mask)
-		return 0;
-
-	if (dev_info->available_scan_masks)
-		mask = iio_scan_mask_match(dev_info->available_scan_masks,
-					ring->scan_mask);
-	else
-		mask = ring->scan_mask;
-
-	if (!mask)
-		return -EINVAL;
-
-	return !!(mask & (1 << bit));
-};
+int iio_scan_mask_query(struct iio_ring_buffer *ring, int bit);
 
 /**
  * iio_scan_mask_set() - set particular bit in the scan mask
  * @ring: the ring buffer whose scan mask we are interested in
  * @bit: the bit to be set.
  **/
-static inline int iio_scan_mask_set(struct iio_ring_buffer *ring, int bit)
-{
-	struct iio_dev *dev_info = ring->indio_dev;
-	u32 mask;
-	u32 trialmask = ring->scan_mask | (1 << bit);
-
-	if (bit > IIO_MAX_SCAN_LENGTH)
-		return -EINVAL;
-	if (dev_info->available_scan_masks) {
-		mask = iio_scan_mask_match(dev_info->available_scan_masks,
-					trialmask);
-		if (!mask)
-			return -EINVAL;
-	}
-	ring->scan_mask = trialmask;
-	ring->scan_count++;
-
-	return 0;
-};
+int iio_scan_mask_set(struct iio_ring_buffer *ring, int bit);
 
 #define to_iio_ring_buffer(d)				\
 	container_of(d, struct iio_ring_buffer, dev)