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 */
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
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