include/uapi/linux/iio/buffer.h

   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_ */