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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/* industrial I/O buffer definitions needed both in and out of kernel
3 */
4
5#ifndef _UAPI_IIO_BUFFER_H_
6#define _UAPI_IIO_BUFFER_H_
7
8#include <linux/types.h>
9
10/* Flags for iio_dmabuf.flags */
11#define IIO_BUFFER_DMABUF_CYCLIC (1 << 0)
12#define IIO_BUFFER_DMABUF_SUPPORTED_FLAGS 0x00000001
13
14/**
15 * struct iio_dmabuf - Descriptor for a single IIO DMABUF object
16 * @fd: file descriptor of the DMABUF object
17 * @flags: one or more IIO_BUFFER_DMABUF_* flags
18 * @bytes_used: number of bytes used in this DMABUF for the data transfer.
19 * Should generally be set to the DMABUF's size.
20 */
21struct iio_dmabuf {
22 __u32 fd;
23 __u32 flags;
24 __u64 bytes_used;
25};
26
27#define IIO_BUFFER_GET_FD_IOCTL _IOWR('i', 0x91, int)
28#define IIO_BUFFER_DMABUF_ATTACH_IOCTL _IOW('i', 0x92, int)
29#define IIO_BUFFER_DMABUF_DETACH_IOCTL _IOW('i', 0x93, int)
30#define IIO_BUFFER_DMABUF_ENQUEUE_IOCTL _IOW('i', 0x94, struct iio_dmabuf)
31
32#endif /* _UAPI_IIO_BUFFER_H_ */