48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
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/*
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* Definitions for virtio I2C Adpter
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*
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* Copyright (c) 2021 Intel Corporation. All rights reserved.
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*/
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#ifndef _LINUX_VIRTIO_I2C_H
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#define _LINUX_VIRTIO_I2C_H
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#include "standard-headers/linux/const.h"
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#include "standard-headers/linux/types.h"
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/* Virtio I2C Feature bits */
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#define VIRTIO_I2C_F_ZERO_LENGTH_REQUEST 0
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/* The bit 0 of the @virtio_i2c_out_hdr.@flags, used to group the requests */
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#define VIRTIO_I2C_FLAGS_FAIL_NEXT _BITUL(0)
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/* The bit 1 of the @virtio_i2c_out_hdr.@flags, used to mark a buffer as read */
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#define VIRTIO_I2C_FLAGS_M_RD _BITUL(1)
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/**
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* struct virtio_i2c_out_hdr - the virtio I2C message OUT header
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* @addr: the controlled device address
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* @padding: used to pad to full dword
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* @flags: used for feature extensibility
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*/
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struct virtio_i2c_out_hdr {
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uint16_t addr;
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uint16_t padding;
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uint32_t flags;
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};
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/**
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* struct virtio_i2c_in_hdr - the virtio I2C message IN header
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* @status: the processing result from the backend
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*/
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struct virtio_i2c_in_hdr {
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uint8_t status;
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};
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/* The final status written by the device */
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#define VIRTIO_I2C_MSG_OK 0
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#define VIRTIO_I2C_MSG_ERR 1
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#endif /* _LINUX_VIRTIO_I2C_H */
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