1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* The industrial I/O core - generic buffer interfaces.
3  *
4  * Copyright (c) 2008 Jonathan Cameron
5  */
6 
7 #ifndef _IIO_BUFFER_GENERIC_H_
8 #define _IIO_BUFFER_GENERIC_H_
9 #include <linux/sysfs.h>
10 #include <linux/iio/iio.h>
11 
12 struct iio_buffer;
13 
14 enum iio_buffer_direction {
15 	IIO_BUFFER_DIRECTION_IN,
16 	IIO_BUFFER_DIRECTION_OUT,
17 };
18 
19 int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data);
20 
21 int iio_pop_from_buffer(struct iio_buffer *buffer, void *data);
22 
23 /**
24  * iio_push_to_buffers_with_timestamp() - push data and timestamp to buffers
25  * @indio_dev:		iio_dev structure for device.
26  * @data:		sample data
27  * @timestamp:		timestamp for the sample data
28  *
29  * Pushes data to the IIO device's buffers. If timestamps are enabled for the
30  * device the function will store the supplied timestamp as the last element in
31  * the sample data buffer before pushing it to the device buffers. The sample
32  * data buffer needs to be large enough to hold the additional timestamp
33  * (usually the buffer should be indio->scan_bytes bytes large).
34  *
35  * Returns 0 on success, a negative error code otherwise.
36  */
iio_push_to_buffers_with_timestamp(struct iio_dev * indio_dev,void * data,int64_t timestamp)37 static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev,
38 	void *data, int64_t timestamp)
39 {
40 	if (indio_dev->scan_timestamp) {
41 		size_t ts_offset = indio_dev->scan_bytes / sizeof(int64_t) - 1;
42 		((int64_t *)data)[ts_offset] = timestamp;
43 	}
44 
45 	return iio_push_to_buffers(indio_dev, data);
46 }
47 
48 int iio_push_to_buffers_with_ts_unaligned(struct iio_dev *indio_dev,
49 					  const void *data, size_t data_sz,
50 					  int64_t timestamp);
51 
52 bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
53 				   const unsigned long *mask);
54 
55 int iio_device_attach_buffer(struct iio_dev *indio_dev,
56 			     struct iio_buffer *buffer);
57 
58 #endif /* _IIO_BUFFER_GENERIC_H_ */
59