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Add an I2C bus driver for virtio para-virtualization. The controller can be emulated by the backend driver in any device model software by following the virtio protocol. The device specification can be found on https://lists.oasis-open.org/archives/virtio-comment/202101/msg00008.html. By following the specification, people may implement different backend drivers to emulate different controllers according to their needs. Co-developed-by: Conghui Chen <conghui.chen@intel.com> Signed-off-by: Conghui Chen <conghui.chen@intel.com> Signed-off-by: Jie Deng <jie.deng@intel.com> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
42 lines
1004 B
C
42 lines
1004 B
C
/* 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 _UAPI_LINUX_VIRTIO_I2C_H
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#define _UAPI_LINUX_VIRTIO_I2C_H
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#include <linux/const.h>
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#include <linux/types.h>
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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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/**
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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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__le16 addr;
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__le16 padding;
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__le32 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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__u8 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 /* _UAPI_LINUX_VIRTIO_I2C_H */
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