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Multi-touch fields re-use the page that is used by the other features which means that you can interleave multi-touch, motion, and key events. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Acked-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com>
521 lines
22 KiB
C
521 lines
22 KiB
C
/*
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* kbdif.h -- Xen virtual keyboard/mouse
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
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* Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
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*/
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#ifndef __XEN_PUBLIC_IO_KBDIF_H__
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#define __XEN_PUBLIC_IO_KBDIF_H__
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/*
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*****************************************************************************
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* Feature and Parameter Negotiation
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*****************************************************************************
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*
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* The two halves of a para-virtual driver utilize nodes within
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* XenStore to communicate capabilities and to negotiate operating parameters.
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* This section enumerates these nodes which reside in the respective front and
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* backend portions of XenStore, following XenBus convention.
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*
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* All data in XenStore is stored as strings. Nodes specifying numeric
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* values are encoded in decimal. Integer value ranges listed below are
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* expressed as fixed sized integer types capable of storing the conversion
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* of a properly formated node string, without loss of information.
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*
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*****************************************************************************
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* Backend XenBus Nodes
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*****************************************************************************
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*
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*---------------------------- Features supported ----------------------------
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*
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* Capable backend advertises supported features by publishing
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* corresponding entries in XenStore and puts 1 as the value of the entry.
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* If a feature is not supported then 0 must be set or feature entry omitted.
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*
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* feature-abs-pointer
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* Values: <uint>
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*
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* Backends, which support reporting of absolute coordinates for pointer
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* device should set this to 1.
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*
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* feature-multi-touch
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* Values: <uint>
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*
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* Backends, which support reporting of multi-touch events
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* should set this to 1.
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*
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*------------------------- Pointer Device Parameters ------------------------
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*
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* width
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* Values: <uint>
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*
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* Maximum X coordinate (width) to be used by the frontend
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* while reporting input events, pixels, [0; UINT32_MAX].
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*
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* height
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* Values: <uint>
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*
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* Maximum Y coordinate (height) to be used by the frontend
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* while reporting input events, pixels, [0; UINT32_MAX].
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*
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*****************************************************************************
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* Frontend XenBus Nodes
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*****************************************************************************
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*
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*------------------------------ Feature request -----------------------------
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*
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* Capable frontend requests features from backend via setting corresponding
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* entries to 1 in XenStore. Requests for features not advertised as supported
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* by the backend have no effect.
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*
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* request-abs-pointer
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* Values: <uint>
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*
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* Request backend to report absolute pointer coordinates
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* (XENKBD_TYPE_POS) instead of relative ones (XENKBD_TYPE_MOTION).
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*
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* request-multi-touch
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* Values: <uint>
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*
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* Request backend to report multi-touch events.
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*
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*----------------------- Request Transport Parameters -----------------------
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*
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* event-channel
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* Values: <uint>
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*
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* The identifier of the Xen event channel used to signal activity
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* in the ring buffer.
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*
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* page-gref
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* Values: <uint>
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*
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* The Xen grant reference granting permission for the backend to map
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* a sole page in a single page sized event ring buffer.
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*
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* page-ref
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* Values: <uint>
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*
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* OBSOLETE, not recommended for use.
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* PFN of the shared page.
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*
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*----------------------- Multi-touch Device Parameters -----------------------
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*
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* multi-touch-num-contacts
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* Values: <uint>
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*
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* Number of simultaneous touches reported.
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*
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* multi-touch-width
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* Values: <uint>
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*
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* Width of the touch area to be used by the frontend
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* while reporting input events, pixels, [0; UINT32_MAX].
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*
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* multi-touch-height
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* Values: <uint>
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*
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* Height of the touch area to be used by the frontend
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* while reporting input events, pixels, [0; UINT32_MAX].
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*/
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/*
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* EVENT CODES.
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*/
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#define XENKBD_TYPE_MOTION 1
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#define XENKBD_TYPE_RESERVED 2
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#define XENKBD_TYPE_KEY 3
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#define XENKBD_TYPE_POS 4
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#define XENKBD_TYPE_MTOUCH 5
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/* Multi-touch event sub-codes */
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#define XENKBD_MT_EV_DOWN 0
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#define XENKBD_MT_EV_UP 1
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#define XENKBD_MT_EV_MOTION 2
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#define XENKBD_MT_EV_SYN 3
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#define XENKBD_MT_EV_SHAPE 4
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#define XENKBD_MT_EV_ORIENT 5
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/*
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* CONSTANTS, XENSTORE FIELD AND PATH NAME STRINGS, HELPERS.
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*/
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#define XENKBD_DRIVER_NAME "vkbd"
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#define XENKBD_FIELD_FEAT_ABS_POINTER "feature-abs-pointer"
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#define XENKBD_FIELD_FEAT_MTOUCH "feature-multi-touch"
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#define XENKBD_FIELD_REQ_ABS_POINTER "request-abs-pointer"
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#define XENKBD_FIELD_REQ_MTOUCH "request-multi-touch"
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#define XENKBD_FIELD_RING_GREF "page-gref"
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#define XENKBD_FIELD_EVT_CHANNEL "event-channel"
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#define XENKBD_FIELD_WIDTH "width"
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#define XENKBD_FIELD_HEIGHT "height"
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#define XENKBD_FIELD_MT_WIDTH "multi-touch-width"
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#define XENKBD_FIELD_MT_HEIGHT "multi-touch-height"
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#define XENKBD_FIELD_MT_NUM_CONTACTS "multi-touch-num-contacts"
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/* OBSOLETE, not recommended for use */
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#define XENKBD_FIELD_RING_REF "page-ref"
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/*
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*****************************************************************************
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* Description of the protocol between frontend and backend driver.
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*****************************************************************************
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*
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* The two halves of a Para-virtual driver communicate with
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* each other using a shared page and an event channel.
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* Shared page contains a ring with event structures.
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*
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* All reserved fields in the structures below must be 0.
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*
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*****************************************************************************
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* Backend to frontend events
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*****************************************************************************
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*
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* Frontends should ignore unknown in events.
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* All event packets have the same length (40 octets)
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* All event packets have common header:
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*
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* 0 octet
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* +-----------------+
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* | type |
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* +-----------------+
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* type - uint8_t, event code, XENKBD_TYPE_???
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*
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*
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* Pointer relative movement event
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MOTION | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | rel_x | 8
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* +----------------+----------------+----------------+----------------+
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* | rel_y | 12
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* +----------------+----------------+----------------+----------------+
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* | rel_z | 16
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* +----------------+----------------+----------------+----------------+
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* | reserved | 20
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* rel_x - int32_t, relative X motion
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* rel_y - int32_t, relative Y motion
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* rel_z - int32_t, relative Z motion (wheel)
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*/
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struct xenkbd_motion {
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uint8_t type;
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int32_t rel_x;
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int32_t rel_y;
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int32_t rel_z;
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};
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/*
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* Key event (includes pointer buttons)
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_KEY | pressed | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | keycode | 8
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* +----------------+----------------+----------------+----------------+
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* | reserved | 12
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* pressed - uint8_t, 1 if pressed; 0 otherwise
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* keycode - uint32_t, KEY_* from linux/input.h
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*/
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struct xenkbd_key {
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uint8_t type;
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uint8_t pressed;
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uint32_t keycode;
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};
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/*
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* Pointer absolute position event
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_POS | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | abs_x | 8
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* +----------------+----------------+----------------+----------------+
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* | abs_y | 12
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* +----------------+----------------+----------------+----------------+
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* | rel_z | 16
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* +----------------+----------------+----------------+----------------+
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* | reserved | 20
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* abs_x - int32_t, absolute X position (in FB pixels)
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* abs_y - int32_t, absolute Y position (in FB pixels)
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* rel_z - int32_t, relative Z motion (wheel)
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*/
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struct xenkbd_position {
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uint8_t type;
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int32_t abs_x;
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int32_t abs_y;
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int32_t rel_z;
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};
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/*
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* Multi-touch event and its sub-types
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*
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* All multi-touch event packets have common header:
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*
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | event_type | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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*
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* event_type - unt8_t, multi-touch event sub-type, XENKBD_MT_EV_???
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* contact_id - unt8_t, ID of the contact
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*
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* Touch interactions can consist of one or more contacts.
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* For each contact, a series of events is generated, starting
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* with a down event, followed by zero or more motion events,
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* and ending with an up event. Events relating to the same
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* contact point can be identified by the ID of the sequence: contact ID.
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* Contact ID may be reused after XENKBD_MT_EV_UP event and
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* is in the [0; XENKBD_FIELD_NUM_CONTACTS - 1] range.
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*
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* For further information please refer to documentation on Wayland [1],
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* Linux [2] and Windows [3] multi-touch support.
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*
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* [1] https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml
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* [2] https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
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* [3] https://msdn.microsoft.com/en-us/library/jj151564(v=vs.85).aspx
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*
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*
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* Multi-touch down event - sent when a new touch is made: touch is assigned
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* a unique contact ID, sent with this and consequent events related
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* to this touch.
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | _MT_EV_DOWN | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* | abs_x | 12
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* +----------------+----------------+----------------+----------------+
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* | abs_y | 16
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* +----------------+----------------+----------------+----------------+
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* | reserved | 20
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* abs_x - int32_t, absolute X position, in pixels
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* abs_y - int32_t, absolute Y position, in pixels
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*
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* Multi-touch contact release event
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | _MT_EV_UP | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* Multi-touch motion event
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | _MT_EV_MOTION | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* | abs_x | 12
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* +----------------+----------------+----------------+----------------+
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* | abs_y | 16
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* +----------------+----------------+----------------+----------------+
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* | reserved | 20
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* abs_x - int32_t, absolute X position, in pixels,
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* abs_y - int32_t, absolute Y position, in pixels,
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*
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* Multi-touch input synchronization event - shows end of a set of events
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* which logically belong together.
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | _MT_EV_SYN | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* Multi-touch shape event - touch point's shape has changed its shape.
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* Shape is approximated by an ellipse through the major and minor axis
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* lengths: major is the longer diameter of the ellipse and minor is the
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* shorter one. Center of the ellipse is reported via
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* XENKBD_MT_EV_DOWN/XENKBD_MT_EV_MOTION events.
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | _MT_EV_SHAPE | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* | major | 12
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* +----------------+----------------+----------------+----------------+
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* | minor | 16
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* +----------------+----------------+----------------+----------------+
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* | reserved | 20
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* major - unt32_t, length of the major axis, pixels
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* minor - unt32_t, length of the minor axis, pixels
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*
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* Multi-touch orientation event - touch point's shape has changed
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* its orientation: calculated as a clockwise angle between the major axis
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* of the ellipse and positive Y axis in degrees, [-180; +180].
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | _TYPE_MTOUCH | _MT_EV_ORIENT | contact_id | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* | orientation | reserved | 12
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* +----------------+----------------+----------------+----------------+
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* | reserved | 16
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 40
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* +----------------+----------------+----------------+----------------+
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*
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* orientation - int16_t, clockwise angle of the major axis
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*/
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struct xenkbd_mtouch {
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uint8_t type; /* XENKBD_TYPE_MTOUCH */
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uint8_t event_type; /* XENKBD_MT_EV_??? */
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uint8_t contact_id;
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uint8_t reserved[5]; /* reserved for the future use */
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union {
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struct {
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int32_t abs_x; /* absolute X position, pixels */
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int32_t abs_y; /* absolute Y position, pixels */
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} pos;
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struct {
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uint32_t major; /* length of the major axis, pixels */
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uint32_t minor; /* length of the minor axis, pixels */
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} shape;
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int16_t orientation; /* clockwise angle of the major axis */
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} u;
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};
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#define XENKBD_IN_EVENT_SIZE 40
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union xenkbd_in_event {
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uint8_t type;
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struct xenkbd_motion motion;
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struct xenkbd_key key;
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struct xenkbd_position pos;
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struct xenkbd_mtouch mtouch;
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char pad[XENKBD_IN_EVENT_SIZE];
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};
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/*
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*****************************************************************************
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* Frontend to backend events
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*****************************************************************************
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*
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* Out events may be sent only when requested by backend, and receipt
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* of an unknown out event is an error.
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* No out events currently defined.
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* All event packets have the same length (40 octets)
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* All event packets have common header:
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* 0 octet
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* +-----------------+
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* | type |
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* +-----------------+
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* type - uint8_t, event code
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*/
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#define XENKBD_OUT_EVENT_SIZE 40
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union xenkbd_out_event {
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uint8_t type;
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char pad[XENKBD_OUT_EVENT_SIZE];
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};
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|
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/*
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|
*****************************************************************************
|
|
* Shared page
|
|
*****************************************************************************
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|
*/
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|
|
|
#define XENKBD_IN_RING_SIZE 2048
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|
#define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
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#define XENKBD_IN_RING_OFFS 1024
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|
#define XENKBD_IN_RING(page) \
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((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS))
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#define XENKBD_IN_RING_REF(page, idx) \
|
|
(XENKBD_IN_RING((page))[(idx) % XENKBD_IN_RING_LEN])
|
|
|
|
#define XENKBD_OUT_RING_SIZE 1024
|
|
#define XENKBD_OUT_RING_LEN (XENKBD_OUT_RING_SIZE / XENKBD_OUT_EVENT_SIZE)
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|
#define XENKBD_OUT_RING_OFFS (XENKBD_IN_RING_OFFS + XENKBD_IN_RING_SIZE)
|
|
#define XENKBD_OUT_RING(page) \
|
|
((union xenkbd_out_event *)((char *)(page) + XENKBD_OUT_RING_OFFS))
|
|
#define XENKBD_OUT_RING_REF(page, idx) \
|
|
(XENKBD_OUT_RING((page))[(idx) % XENKBD_OUT_RING_LEN])
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|
|
|
struct xenkbd_page {
|
|
uint32_t in_cons, in_prod;
|
|
uint32_t out_cons, out_prod;
|
|
};
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|
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#endif /* __XEN_PUBLIC_IO_KBDIF_H__ */
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