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/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */

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* Intel Management Engine Interface (Intel MEI) Linux driver

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* Intel MEI Interface Header

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#ifndef _LINUX_MEI_H

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#define _LINUX_MEI_H

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#include <linux/uuid.h>

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* This IOCTL is used to associate the current file descriptor with a

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* FW Client (given by UUID). This opens a communication channel

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* between a host client and a FW client. From this point every read and write

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* will communicate with the associated FW client.

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* Only in close() (file_operation release()) the communication between

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* the clients is disconnected

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* The IOCTL argument is a struct with a union that contains

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* the input parameter and the output parameter for this IOCTL.

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* The input parameter is UUID of the FW Client.

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* The output parameter is the properties of the FW client

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* (FW protocol version and max message size).

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#define IOCTL_MEI_CONNECT_CLIENT \

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_IOWR('H' , 0x01, struct mei_connect_client_data)

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* Intel MEI client information struct

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struct mei_client {

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__u32 max_msg_length;

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__u8 protocol_version;

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__u8 reserved[3];

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};

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* IOCTL Connect Client Data structure

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struct mei_connect_client_data {

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union {

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uuid_le in_client_uuid;

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struct mei_client out_client_properties;

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};

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};

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/**

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* DOC: set and unset event notification for a connected client

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* The IOCTL argument is 1 for enabling event notification and 0 for

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* disabling the service

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* Return: -EOPNOTSUPP if the devices doesn't support the feature

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#define IOCTL_MEI_NOTIFY_SET _IOW('H', 0x02, __u32)

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/**

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* DOC: retrieve notification

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* The IOCTL output argument is 1 if an event was is pending and 0 otherwise

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* the ioctl has to be called in order to acknowledge pending event

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* Return: -EOPNOTSUPP if the devices doesn't support the feature

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#define IOCTL_MEI_NOTIFY_GET _IOR('H', 0x03, __u32)

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/**

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* struct mei_connect_client_vtag - mei client information struct with vtag

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* @in_client_uuid: UUID of client to connect

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* @vtag: virtual tag

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* @reserved: reserved for future use

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struct mei_connect_client_vtag {

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uuid_le in_client_uuid;

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__u8 vtag;

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__u8 reserved[3];

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};

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/**

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* struct mei_connect_client_data_vtag - IOCTL connect data union

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* @connect: input connect data

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* @out_client_properties: output client data

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struct mei_connect_client_data_vtag {

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union {

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struct mei_connect_client_vtag connect;

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struct mei_client out_client_properties;

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};

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};

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/**

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* DOC:

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* This IOCTL is used to associate the current file descriptor with a

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* FW Client (given by UUID), and virtual tag (vtag).

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* The IOCTL opens a communication channel between a host client and

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* a FW client on a tagged channel. From this point on, every read

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* and write will communicate with the associated FW client with

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* on the tagged channel.

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* Upone close() the communication is terminated.

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* The IOCTL argument is a struct with a union that contains

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* the input parameter and the output parameter for this IOCTL.

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* The input parameter is UUID of the FW Client, a vtag [0,255]

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* The output parameter is the properties of the FW client

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* (FW protocool version and max message size).

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* Clients that do not support tagged connection

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* will respond with -EOPNOTSUPP.

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#define IOCTL_MEI_CONNECT_CLIENT_VTAG \

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_IOWR('H', 0x04, struct mei_connect_client_data_vtag)

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#endif /* _LINUX_MEI_H */

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