include/uapi/linux/mei.h

   1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
   2 /*
   3  * Copyright(c) 2003-2015 Intel Corporation. All rights reserved.
   4  * Intel Management Engine Interface (Intel MEI) Linux driver
   5  * Intel MEI Interface Header
   6  */
   7 #ifndef _LINUX_MEI_H
   8 #define _LINUX_MEI_H
   9
  10 #include <linux/mei_uuid.h>
  11
  12 /*
  13  * This IOCTL is used to associate the current file descriptor with a
  14  * FW Client (given by UUID). This opens a communication channel
  15  * between a host client and a FW client. From this point every read and write
  16  * will communicate with the associated FW client.
  17  * Only in close() (file_operation release()) is the communication between
  18  * the clients disconnected.
  19  *
  20  * The IOCTL argument is a struct with a union that contains
  21  * the input parameter and the output parameter for this IOCTL.
  22  *
  23  * The input parameter is UUID of the FW Client.
  24  * The output parameter is the properties of the FW client
  25  * (FW protocol version and max message size).
  26  *
  27  */
  28 #define IOCTL_MEI_CONNECT_CLIENT \
  29         _IOWR('H' , 0x01, struct mei_connect_client_data)
  30
  31 /*
  32  * Intel MEI client information struct
  33  */
  34 struct mei_client {
  35         __u32 max_msg_length;
  36         __u8 protocol_version;
  37         __u8 reserved[3];
  38 };
  39
  40 /*
  41  * IOCTL Connect Client Data structure
  42  */
  43 struct mei_connect_client_data {
  44         union {
  45                 uuid_le in_client_uuid;
  46                 struct mei_client out_client_properties;
  47         };
  48 };
  49
  50 /**
  51  * DOC: set and unset event notification for a connected client
  52  *
  53  * The IOCTL argument is 1 for enabling event notification and 0 for
  54  * disabling the service.
  55  * Return:  -EOPNOTSUPP if the devices doesn't support the feature
  56  */
  57 #define IOCTL_MEI_NOTIFY_SET _IOW('H', 0x02, __u32)
  58
  59 /**
  60  * DOC: retrieve notification
  61  *
  62  * The IOCTL output argument is 1 if an event was pending and 0 otherwise.
  63  * The ioctl has to be called in order to acknowledge pending event.
  64  *
  65  * Return:  -EOPNOTSUPP if the devices doesn't support the feature
  66  */
  67 #define IOCTL_MEI_NOTIFY_GET _IOR('H', 0x03, __u32)
  68
  69 /**
  70  * struct mei_connect_client_vtag - mei client information struct with vtag
  71  *
  72  * @in_client_uuid: UUID of client to connect
  73  * @vtag: virtual tag
  74  * @reserved: reserved for future use
  75  */
  76 struct mei_connect_client_vtag {
  77         uuid_le in_client_uuid;
  78         __u8 vtag;
  79         __u8 reserved[3];
  80 };
  81
  82 /**
  83  * struct mei_connect_client_data_vtag - IOCTL connect data union
  84  *
  85  * @connect: input connect data
  86  * @out_client_properties: output client data
  87  */
  88 struct mei_connect_client_data_vtag {
  89         union {
  90                 struct mei_connect_client_vtag connect;
  91                 struct mei_client out_client_properties;
  92         };
  93 };
  94
  95 /**
  96  * DOC:
  97  * This IOCTL is used to associate the current file descriptor with a
  98  * FW Client (given by UUID), and virtual tag (vtag).
  99  * The IOCTL opens a communication channel between a host client and
 100  * a FW client on a tagged channel. From this point on, every read
 101  * and write will communicate with the associated FW client
 102  * on the tagged channel.
 103  * Upon close() the communication is terminated.
 104  *
 105  * The IOCTL argument is a struct with a union that contains
 106  * the input parameter and the output parameter for this IOCTL.
 107  *
 108  * The input parameter is UUID of the FW Client, a vtag [0,255].
 109  * The output parameter is the properties of the FW client
 110  * (FW protocol version and max message size).
 111  *
 112  * Clients that do not support tagged connection
 113  * will respond with -EOPNOTSUPP.
 114  */
 115 #define IOCTL_MEI_CONNECT_CLIENT_VTAG \
 116         _IOWR('H', 0x04, struct mei_connect_client_data_vtag)
 117
 118 #endif /* _LINUX_MEI_H  */