148 lines
5.0 KiB
C
148 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* Surface System Aggregator Module (SSAM) user-space EC interface.
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*
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* Definitions, structs, and IOCTLs for the /dev/surface/aggregator misc
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* device. This device provides direct user-space access to the SSAM EC.
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* Intended for debugging and development.
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*
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* Copyright (C) 2020-2021 Maximilian Luz <luzmaximilian@gmail.com>
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*/
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#ifndef _UAPI_LINUX_SURFACE_AGGREGATOR_CDEV_H
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#define _UAPI_LINUX_SURFACE_AGGREGATOR_CDEV_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/**
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* enum ssam_cdev_request_flags - Request flags for SSAM cdev request IOCTL.
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*
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* @SSAM_CDEV_REQUEST_HAS_RESPONSE:
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* Specifies that the request expects a response. If not set, the request
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* will be directly completed after its underlying packet has been
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* transmitted. If set, the request transport system waits for a response
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* of the request.
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*
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* @SSAM_CDEV_REQUEST_UNSEQUENCED:
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* Specifies that the request should be transmitted via an unsequenced
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* packet. If set, the request must not have a response, meaning that this
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* flag and the %SSAM_CDEV_REQUEST_HAS_RESPONSE flag are mutually
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* exclusive.
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*/
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enum ssam_cdev_request_flags {
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SSAM_CDEV_REQUEST_HAS_RESPONSE = 0x01,
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SSAM_CDEV_REQUEST_UNSEQUENCED = 0x02,
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};
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/**
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* struct ssam_cdev_request - Controller request IOCTL argument.
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* @target_category: Target category of the SAM request.
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* @target_id: Target ID of the SAM request.
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* @command_id: Command ID of the SAM request.
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* @instance_id: Instance ID of the SAM request.
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* @flags: Request flags (see &enum ssam_cdev_request_flags).
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* @status: Request status (output).
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* @payload: Request payload (input data).
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* @payload.data: Pointer to request payload data.
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* @payload.length: Length of request payload data (in bytes).
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* @response: Request response (output data).
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* @response.data: Pointer to response buffer.
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* @response.length: On input: Capacity of response buffer (in bytes).
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* On output: Length of request response (number of bytes
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* in the buffer that are actually used).
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*/
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struct ssam_cdev_request {
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__u8 target_category;
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__u8 target_id;
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__u8 command_id;
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__u8 instance_id;
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__u16 flags;
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__s16 status;
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struct {
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__u64 data;
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__u16 length;
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__u8 __pad[6];
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} payload;
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struct {
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__u64 data;
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__u16 length;
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__u8 __pad[6];
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} response;
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} __attribute__((__packed__));
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/**
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* struct ssam_cdev_notifier_desc - Notifier descriptor.
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* @priority: Priority value determining the order in which notifier
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* callbacks will be called. A higher value means higher
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* priority, i.e. the associated callback will be executed
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* earlier than other (lower priority) callbacks.
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* @target_category: The event target category for which this notifier should
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* receive events.
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*
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* Specifies the notifier that should be registered or unregistered,
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* specifically with which priority and for which target category of events.
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*/
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struct ssam_cdev_notifier_desc {
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__s32 priority;
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__u8 target_category;
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} __attribute__((__packed__));
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/**
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* struct ssam_cdev_event_desc - Event descriptor.
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* @reg: Registry via which the event will be enabled/disabled.
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* @reg.target_category: Target category for the event registry requests.
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* @reg.target_id: Target ID for the event registry requests.
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* @reg.cid_enable: Command ID for the event-enable request.
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* @reg.cid_disable: Command ID for the event-disable request.
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* @id: ID specifying the event.
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* @id.target_category: Target category of the event source.
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* @id.instance: Instance ID of the event source.
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* @flags: Flags used for enabling the event.
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*
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* Specifies which event should be enabled/disabled and how to do that.
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*/
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struct ssam_cdev_event_desc {
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struct {
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__u8 target_category;
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__u8 target_id;
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__u8 cid_enable;
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__u8 cid_disable;
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} reg;
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struct {
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__u8 target_category;
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__u8 instance;
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} id;
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__u8 flags;
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} __attribute__((__packed__));
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/**
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* struct ssam_cdev_event - SSAM event sent by the EC.
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* @target_category: Target category of the event source. See &enum ssam_ssh_tc.
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* @target_id: Target ID of the event source.
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* @command_id: Command ID of the event.
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* @instance_id: Instance ID of the event source.
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* @length: Length of the event payload in bytes.
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* @data: Event payload data.
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*/
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struct ssam_cdev_event {
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__u8 target_category;
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__u8 target_id;
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__u8 command_id;
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__u8 instance_id;
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__u16 length;
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__u8 data[];
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} __attribute__((__packed__));
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#define SSAM_CDEV_REQUEST _IOWR(0xA5, 1, struct ssam_cdev_request)
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#define SSAM_CDEV_NOTIF_REGISTER _IOW(0xA5, 2, struct ssam_cdev_notifier_desc)
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#define SSAM_CDEV_NOTIF_UNREGISTER _IOW(0xA5, 3, struct ssam_cdev_notifier_desc)
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#define SSAM_CDEV_EVENT_ENABLE _IOW(0xA5, 4, struct ssam_cdev_event_desc)
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#define SSAM_CDEV_EVENT_DISABLE _IOW(0xA5, 5, struct ssam_cdev_event_desc)
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#endif /* _UAPI_LINUX_SURFACE_AGGREGATOR_CDEV_H */
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