1 /* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
2 /*
3  * Definitions for virtio I2C Adpter
4  *
5  * Copyright (c) 2021 Intel Corporation. All rights reserved.
6  */
7 
8 #ifndef _LINUX_VIRTIO_I2C_H
9 #define _LINUX_VIRTIO_I2C_H
10 
11 #include "standard-headers/linux/const.h"
12 #include "standard-headers/linux/types.h"
13 
14 /* Virtio I2C Feature bits */
15 #define VIRTIO_I2C_F_ZERO_LENGTH_REQUEST	0
16 
17 /* The bit 0 of the @virtio_i2c_out_hdr.@flags, used to group the requests */
18 #define VIRTIO_I2C_FLAGS_FAIL_NEXT	_BITUL(0)
19 
20 /* The bit 1 of the @virtio_i2c_out_hdr.@flags, used to mark a buffer as read */
21 #define VIRTIO_I2C_FLAGS_M_RD		_BITUL(1)
22 
23 /**
24  * struct virtio_i2c_out_hdr - the virtio I2C message OUT header
25  * @addr: the controlled device address
26  * @padding: used to pad to full dword
27  * @flags: used for feature extensibility
28  */
29 struct virtio_i2c_out_hdr {
30 	uint16_t addr;
31 	uint16_t padding;
32 	uint32_t flags;
33 };
34 
35 /**
36  * struct virtio_i2c_in_hdr - the virtio I2C message IN header
37  * @status: the processing result from the backend
38  */
39 struct virtio_i2c_in_hdr {
40 	uint8_t status;
41 };
42 
43 /* The final status written by the device */
44 #define VIRTIO_I2C_MSG_OK	0
45 #define VIRTIO_I2C_MSG_ERR	1
46 
47 #endif /* _LINUX_VIRTIO_I2C_H */
48