buffer.h (984B) - Raw
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_ */