| 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 _IIO_BUFFER_H_ |
| 6 | #define _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 /* _IIO_BUFFER_H_ */ |