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dtx.h
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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ /* * Surface DTX (clipboard detachment system driver) user-space interface. * * Definitions, structs, and IOCTLs for the /dev/surface/dtx misc device. This * device allows user-space to control the clipboard detachment process on * Surface Book series devices. * * Copyright (C) 2020-2021 Maximilian Luz <luzmaximilian@gmail.com> */ #ifndef _LINUX_SURFACE_AGGREGATOR_DTX_H #define _LINUX_SURFACE_AGGREGATOR_DTX_H #include <linux/ioctl.h> #include <linux/types.h> /* Status/error categories */ #define SDTX_CATEGORY_STATUS 0x0000 #define SDTX_CATEGORY_RUNTIME_ERROR 0x1000 #define SDTX_CATEGORY_HARDWARE_ERROR 0x2000 #define SDTX_CATEGORY_UNKNOWN 0xf000 #define SDTX_CATEGORY_MASK 0xf000 #define SDTX_CATEGORY(value) ((value) & SDTX_CATEGORY_MASK) #define SDTX_STATUS(code) ((code) | SDTX_CATEGORY_STATUS) #define SDTX_ERR_RT(code) ((code) | SDTX_CATEGORY_RUNTIME_ERROR) #define SDTX_ERR_HW(code) ((code) | SDTX_CATEGORY_HARDWARE_ERROR) #define SDTX_UNKNOWN(code) ((code) | SDTX_CATEGORY_UNKNOWN) #define SDTX_SUCCESS(value) (SDTX_CATEGORY(value) == SDTX_CATEGORY_STATUS) /* Latch status values */ #define SDTX_LATCH_CLOSED SDTX_STATUS(0x00) #define SDTX_LATCH_OPENED SDTX_STATUS(0x01) /* Base state values */ #define SDTX_BASE_DETACHED SDTX_STATUS(0x00) #define SDTX_BASE_ATTACHED SDTX_STATUS(0x01) /* Runtime errors (non-critical) */ #define SDTX_DETACH_NOT_FEASIBLE SDTX_ERR_RT(0x01) #define SDTX_DETACH_TIMEDOUT SDTX_ERR_RT(0x02) /* Hardware errors (critical) */ #define SDTX_ERR_FAILED_TO_OPEN SDTX_ERR_HW(0x01) #define SDTX_ERR_FAILED_TO_REMAIN_OPEN SDTX_ERR_HW(0x02) #define SDTX_ERR_FAILED_TO_CLOSE SDTX_ERR_HW(0x03) /* Base types */ #define SDTX_DEVICE_TYPE_HID 0x0100 #define SDTX_DEVICE_TYPE_SSH 0x0200 #define SDTX_DEVICE_TYPE_MASK 0x0f00 #define SDTX_DEVICE_TYPE(value) ((value) & SDTX_DEVICE_TYPE_MASK) #define SDTX_BASE_TYPE_HID(id) ((id) | SDTX_DEVICE_TYPE_HID) #define SDTX_BASE_TYPE_SSH(id) ((id) | SDTX_DEVICE_TYPE_SSH) /** * enum sdtx_device_mode - Mode describing how (and if) the clipboard is * attached to the base of the device. * @SDTX_DEVICE_MODE_TABLET: The clipboard is detached from the base and the * device operates as tablet. * @SDTX_DEVICE_MODE_LAPTOP: The clipboard is attached normally to the base * and the device operates as laptop. * @SDTX_DEVICE_MODE_STUDIO: The clipboard is attached to the base in reverse. * The device operates as tablet with keyboard and * touchpad deactivated, however, the base battery * and, if present in the specific device model, dGPU * are available to the system. */ enum sdtx_device_mode { SDTX_DEVICE_MODE_TABLET = 0x00, SDTX_DEVICE_MODE_LAPTOP = 0x01, SDTX_DEVICE_MODE_STUDIO = 0x02, }; /** * struct sdtx_event - Event provided by reading from the DTX device file. * @length: Length of the event payload, in bytes. * @code: Event code, detailing what type of event this is. * @data: Payload of the event, containing @length bytes. * * See &enum sdtx_event_code for currently valid event codes. */ struct sdtx_event { __u16 length; __u16 code; __u8 data[]; } __attribute__((__packed__)); /** * enum sdtx_event_code - Code describing the type of an event. * @SDTX_EVENT_REQUEST: Detachment request event type. * @SDTX_EVENT_CANCEL: Cancel detachment process event type. * @SDTX_EVENT_BASE_CONNECTION: Base/clipboard connection change event type. * @SDTX_EVENT_LATCH_STATUS: Latch status change event type. * @SDTX_EVENT_DEVICE_MODE: Device mode change event type. * * Used in &struct sdtx_event to describe the type of the event. Further event * codes are reserved for future use. Any event parser should be able to * gracefully handle unknown events, i.e. by simply skipping them. * * Consult the DTX user-space interface documentation for details regarding * the individual event types. */ enum sdtx_event_code { SDTX_EVENT_REQUEST = 1, SDTX_EVENT_CANCEL = 2, SDTX_EVENT_BASE_CONNECTION = 3, SDTX_EVENT_LATCH_STATUS = 4, SDTX_EVENT_DEVICE_MODE = 5, }; /** * struct sdtx_base_info - Describes if and what type of base is connected. * @state: The state of the connection. Valid values are %SDTX_BASE_DETACHED, * %SDTX_BASE_ATTACHED, and %SDTX_DETACH_NOT_FEASIBLE (in case a base * is attached but low clipboard battery prevents detachment). Other * values are currently reserved. * @base_id: The type of base connected. Zero if no base is connected. */ struct sdtx_base_info { __u16 state; __u16 base_id; } __attribute__((__packed__)); /* IOCTLs */ #define SDTX_IOCTL_EVENTS_ENABLE _IO(0xa5, 0x21) #define SDTX_IOCTL_EVENTS_DISABLE _IO(0xa5, 0x22) #define SDTX_IOCTL_LATCH_LOCK _IO(0xa5, 0x23) #define SDTX_IOCTL_LATCH_UNLOCK _IO(0xa5, 0x24) #define SDTX_IOCTL_LATCH_REQUEST _IO(0xa5, 0x25) #define SDTX_IOCTL_LATCH_CONFIRM _IO(0xa5, 0x26) #define SDTX_IOCTL_LATCH_HEARTBEAT _IO(0xa5, 0x27) #define SDTX_IOCTL_LATCH_CANCEL _IO(0xa5, 0x28) #define SDTX_IOCTL_GET_BASE_INFO _IOR(0xa5, 0x29, struct sdtx_base_info) #define SDTX_IOCTL_GET_DEVICE_MODE _IOR(0xa5, 0x2a, __u16) #define SDTX_IOCTL_GET_LATCH_STATUS _IOR(0xa5, 0x2b, __u16) #endif /* _LINUX_SURFACE_AGGREGATOR_DTX_H */