147 lines
5.3 KiB
C
147 lines
5.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* Surface DTX (clipboard detachment system driver) user-space interface.
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*
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* Definitions, structs, and IOCTLs for the /dev/surface/dtx misc device. This
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* device allows user-space to control the clipboard detachment process on
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* Surface Book series devices.
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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_DTX_H
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#define _UAPI_LINUX_SURFACE_AGGREGATOR_DTX_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/* Status/error categories */
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#define SDTX_CATEGORY_STATUS 0x0000
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#define SDTX_CATEGORY_RUNTIME_ERROR 0x1000
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#define SDTX_CATEGORY_HARDWARE_ERROR 0x2000
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#define SDTX_CATEGORY_UNKNOWN 0xf000
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#define SDTX_CATEGORY_MASK 0xf000
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#define SDTX_CATEGORY(value) ((value) & SDTX_CATEGORY_MASK)
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#define SDTX_STATUS(code) ((code) | SDTX_CATEGORY_STATUS)
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#define SDTX_ERR_RT(code) ((code) | SDTX_CATEGORY_RUNTIME_ERROR)
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#define SDTX_ERR_HW(code) ((code) | SDTX_CATEGORY_HARDWARE_ERROR)
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#define SDTX_UNKNOWN(code) ((code) | SDTX_CATEGORY_UNKNOWN)
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#define SDTX_SUCCESS(value) (SDTX_CATEGORY(value) == SDTX_CATEGORY_STATUS)
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/* Latch status values */
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#define SDTX_LATCH_CLOSED SDTX_STATUS(0x00)
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#define SDTX_LATCH_OPENED SDTX_STATUS(0x01)
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/* Base state values */
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#define SDTX_BASE_DETACHED SDTX_STATUS(0x00)
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#define SDTX_BASE_ATTACHED SDTX_STATUS(0x01)
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/* Runtime errors (non-critical) */
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#define SDTX_DETACH_NOT_FEASIBLE SDTX_ERR_RT(0x01)
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#define SDTX_DETACH_TIMEDOUT SDTX_ERR_RT(0x02)
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/* Hardware errors (critical) */
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#define SDTX_ERR_FAILED_TO_OPEN SDTX_ERR_HW(0x01)
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#define SDTX_ERR_FAILED_TO_REMAIN_OPEN SDTX_ERR_HW(0x02)
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#define SDTX_ERR_FAILED_TO_CLOSE SDTX_ERR_HW(0x03)
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/* Base types */
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#define SDTX_DEVICE_TYPE_HID 0x0100
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#define SDTX_DEVICE_TYPE_SSH 0x0200
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#define SDTX_DEVICE_TYPE_MASK 0x0f00
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#define SDTX_DEVICE_TYPE(value) ((value) & SDTX_DEVICE_TYPE_MASK)
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#define SDTX_BASE_TYPE_HID(id) ((id) | SDTX_DEVICE_TYPE_HID)
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#define SDTX_BASE_TYPE_SSH(id) ((id) | SDTX_DEVICE_TYPE_SSH)
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/**
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* enum sdtx_device_mode - Mode describing how (and if) the clipboard is
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* attached to the base of the device.
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* @SDTX_DEVICE_MODE_TABLET: The clipboard is detached from the base and the
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* device operates as tablet.
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* @SDTX_DEVICE_MODE_LAPTOP: The clipboard is attached normally to the base
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* and the device operates as laptop.
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* @SDTX_DEVICE_MODE_STUDIO: The clipboard is attached to the base in reverse.
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* The device operates as tablet with keyboard and
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* touchpad deactivated, however, the base battery
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* and, if present in the specific device model, dGPU
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* are available to the system.
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*/
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enum sdtx_device_mode {
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SDTX_DEVICE_MODE_TABLET = 0x00,
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SDTX_DEVICE_MODE_LAPTOP = 0x01,
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SDTX_DEVICE_MODE_STUDIO = 0x02,
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};
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/**
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* struct sdtx_event - Event provided by reading from the DTX device file.
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* @length: Length of the event payload, in bytes.
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* @code: Event code, detailing what type of event this is.
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* @data: Payload of the event, containing @length bytes.
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*
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* See &enum sdtx_event_code for currently valid event codes.
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*/
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struct sdtx_event {
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__u16 length;
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__u16 code;
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__u8 data[];
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} __attribute__((__packed__));
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/**
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* enum sdtx_event_code - Code describing the type of an event.
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* @SDTX_EVENT_REQUEST: Detachment request event type.
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* @SDTX_EVENT_CANCEL: Cancel detachment process event type.
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* @SDTX_EVENT_BASE_CONNECTION: Base/clipboard connection change event type.
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* @SDTX_EVENT_LATCH_STATUS: Latch status change event type.
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* @SDTX_EVENT_DEVICE_MODE: Device mode change event type.
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*
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* Used in &struct sdtx_event to describe the type of the event. Further event
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* codes are reserved for future use. Any event parser should be able to
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* gracefully handle unknown events, i.e. by simply skipping them.
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*
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* Consult the DTX user-space interface documentation for details regarding
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* the individual event types.
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*/
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enum sdtx_event_code {
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SDTX_EVENT_REQUEST = 1,
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SDTX_EVENT_CANCEL = 2,
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SDTX_EVENT_BASE_CONNECTION = 3,
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SDTX_EVENT_LATCH_STATUS = 4,
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SDTX_EVENT_DEVICE_MODE = 5,
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};
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/**
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* struct sdtx_base_info - Describes if and what type of base is connected.
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* @state: The state of the connection. Valid values are %SDTX_BASE_DETACHED,
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* %SDTX_BASE_ATTACHED, and %SDTX_DETACH_NOT_FEASIBLE (in case a base
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* is attached but low clipboard battery prevents detachment). Other
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* values are currently reserved.
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* @base_id: The type of base connected. Zero if no base is connected.
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*/
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struct sdtx_base_info {
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__u16 state;
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__u16 base_id;
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} __attribute__((__packed__));
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/* IOCTLs */
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#define SDTX_IOCTL_EVENTS_ENABLE _IO(0xa5, 0x21)
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#define SDTX_IOCTL_EVENTS_DISABLE _IO(0xa5, 0x22)
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#define SDTX_IOCTL_LATCH_LOCK _IO(0xa5, 0x23)
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#define SDTX_IOCTL_LATCH_UNLOCK _IO(0xa5, 0x24)
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#define SDTX_IOCTL_LATCH_REQUEST _IO(0xa5, 0x25)
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#define SDTX_IOCTL_LATCH_CONFIRM _IO(0xa5, 0x26)
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#define SDTX_IOCTL_LATCH_HEARTBEAT _IO(0xa5, 0x27)
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#define SDTX_IOCTL_LATCH_CANCEL _IO(0xa5, 0x28)
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#define SDTX_IOCTL_GET_BASE_INFO _IOR(0xa5, 0x29, struct sdtx_base_info)
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#define SDTX_IOCTL_GET_DEVICE_MODE _IOR(0xa5, 0x2a, __u16)
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#define SDTX_IOCTL_GET_LATCH_STATUS _IOR(0xa5, 0x2b, __u16)
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#endif /* _UAPI_LINUX_SURFACE_AGGREGATOR_DTX_H */
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