buffer.h (1817B)
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 12struct iio_buffer; 13 14enum iio_buffer_direction { 15 IIO_BUFFER_DIRECTION_IN, 16 IIO_BUFFER_DIRECTION_OUT, 17}; 18 19int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data); 20 21int 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 */ 37static 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 48int 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 52bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, 53 const unsigned long *mask); 54 55int iio_device_attach_buffer(struct iio_dev *indio_dev, 56 struct iio_buffer *buffer); 57 58#endif /* _IIO_BUFFER_GENERIC_H_ */