include/uapi/linux/mei.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/mei.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/mei.h
Extension
.h
Size
3474 bytes
Lines
119
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct mei_client {
	__u32 max_msg_length;
	__u8 protocol_version;
	__u8 reserved[3];
};

/*
 * IOCTL Connect Client Data structure
 */
struct mei_connect_client_data {
	union {
		uuid_le in_client_uuid;
		struct mei_client out_client_properties;
	};
};

/**
 * DOC: set and unset event notification for a connected client
 *
 * The IOCTL argument is 1 for enabling event notification and 0 for
 * disabling the service.
 * Return:  -EOPNOTSUPP if the devices doesn't support the feature
 */
#define IOCTL_MEI_NOTIFY_SET _IOW('H', 0x02, __u32)

/**
 * DOC: retrieve notification
 *
 * The IOCTL output argument is 1 if an event was pending and 0 otherwise.
 * The ioctl has to be called in order to acknowledge pending event.
 *
 * Return:  -EOPNOTSUPP if the devices doesn't support the feature
 */
#define IOCTL_MEI_NOTIFY_GET _IOR('H', 0x03, __u32)

/**
 * struct mei_connect_client_vtag - mei client information struct with vtag
 *
 * @in_client_uuid: UUID of client to connect
 * @vtag: virtual tag
 * @reserved: reserved for future use
 */
struct mei_connect_client_vtag {
	uuid_le in_client_uuid;
	__u8 vtag;
	__u8 reserved[3];
};

/**
 * struct mei_connect_client_data_vtag - IOCTL connect data union
 *
 * @connect: input connect data
 * @out_client_properties: output client data
 */
struct mei_connect_client_data_vtag {
	union {
		struct mei_connect_client_vtag connect;
		struct mei_client out_client_properties;
	};
};

/**
 * DOC:
 * This IOCTL is used to associate the current file descriptor with a
 * FW Client (given by UUID), and virtual tag (vtag).
 * The IOCTL opens a communication channel between a host client and
 * a FW client on a tagged channel. From this point on, every read
 * and write will communicate with the associated FW client
 * on the tagged channel.
 * Upon close() the communication is terminated.
 *
 * The IOCTL argument is a struct with a union that contains
 * the input parameter and the output parameter for this IOCTL.
 *
 * The input parameter is UUID of the FW Client, a vtag [0,255].
 * The output parameter is the properties of the FW client
 * (FW protocol version and max message size).
 *
 * Clients that do not support tagged connection
 * will respond with -EOPNOTSUPP.
 */
#define IOCTL_MEI_CONNECT_CLIENT_VTAG \
	_IOWR('H', 0x04, struct mei_connect_client_data_vtag)

#endif /* _LINUX_MEI_H  */

Annotation

Implementation Notes