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   */
21  struct 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_ */
33