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kbdif.h
/* SPDX-License-Identifier: MIT */ /* * kbdif.h -- Xen virtual keyboard/mouse * * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com> * Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com> */ #ifndef __XEN_PUBLIC_IO_KBDIF_H__ #define __XEN_PUBLIC_IO_KBDIF_H__ /* ***************************************************************************** * Feature and Parameter Negotiation ***************************************************************************** * * The two halves of a para-virtual driver utilize nodes within * XenStore to communicate capabilities and to negotiate operating parameters. * This section enumerates these nodes which reside in the respective front and * backend portions of XenStore, following XenBus convention. * * All data in XenStore is stored as strings. Nodes specifying numeric * values are encoded in decimal. Integer value ranges listed below are * expressed as fixed sized integer types capable of storing the conversion * of a properly formated node string, without loss of information. * ***************************************************************************** * Backend XenBus Nodes ***************************************************************************** * *---------------------------- Features supported ---------------------------- * * Capable backend advertises supported features by publishing * corresponding entries in XenStore and puts 1 as the value of the entry. * If a feature is not supported then 0 must be set or feature entry omitted. * * feature-disable-keyboard * Values: <uint> * * If there is no need to expose a virtual keyboard device by the * frontend then this must be set to 1. * * feature-disable-pointer * Values: <uint> * * If there is no need to expose a virtual pointer device by the * frontend then this must be set to 1. * * feature-abs-pointer * Values: <uint> * * Backends, which support reporting of absolute coordinates for pointer * device should set this to 1. * * feature-multi-touch * Values: <uint> * * Backends, which support reporting of multi-touch events * should set this to 1. * * feature-raw-pointer * Values: <uint> * * Backends, which support reporting raw (unscaled) absolute coordinates * for pointer devices should set this to 1. Raw (unscaled) values have * a range of [0, 0x7fff]. * *----------------------- Device Instance Parameters ------------------------ * * unique-id * Values: <string> * * After device instance initialization it is assigned a unique ID, * so every instance of the frontend can be identified by the backend * by this ID. This can be UUID or such. * *------------------------- Pointer Device Parameters ------------------------ * * width * Values: <uint> * * Maximum X coordinate (width) to be used by the frontend * while reporting input events, pixels, [0; UINT32_MAX]. * * height * Values: <uint> * * Maximum Y coordinate (height) to be used by the frontend * while reporting input events, pixels, [0; UINT32_MAX]. * *----------------------- Multi-touch Device Parameters ---------------------- * * multi-touch-num-contacts * Values: <uint> * * Number of simultaneous touches reported. * * multi-touch-width * Values: <uint> * * Width of the touch area to be used by the frontend * while reporting input events, pixels, [0; UINT32_MAX]. * * multi-touch-height * Values: <uint> * * Height of the touch area to be used by the frontend * while reporting input events, pixels, [0; UINT32_MAX]. * ***************************************************************************** * Frontend XenBus Nodes ***************************************************************************** * *------------------------------ Feature request ----------------------------- * * Capable frontend requests features from backend via setting corresponding * entries to 1 in XenStore. Requests for features not advertised as supported * by the backend have no effect. * * request-abs-pointer * Values: <uint> * * Request backend to report absolute pointer coordinates * (XENKBD_TYPE_POS) instead of relative ones (XENKBD_TYPE_MOTION). * * request-multi-touch * Values: <uint> * * Request backend to report multi-touch events. * * request-raw-pointer * Values: <uint> * * Request backend to report raw unscaled absolute pointer coordinates. * This option is only valid if request-abs-pointer is also set. * Raw unscaled coordinates have the range [0, 0x7fff] * *----------------------- Request Transport Parameters ----------------------- * * event-channel * Values: <uint> * * The identifier of the Xen event channel used to signal activity * in the ring buffer. * * page-gref * Values: <uint> * * The Xen grant reference granting permission for the backend to map * a sole page in a single page sized event ring buffer. * * page-ref * Values: <uint> * * OBSOLETE, not recommended for use. * PFN of the shared page. */ /* * EVENT CODES. */ #define XENKBD_TYPE_MOTION 1 #define XENKBD_TYPE_RESERVED 2 #define XENKBD_TYPE_KEY 3 #define XENKBD_TYPE_POS 4 #define XENKBD_TYPE_MTOUCH 5 /* Multi-touch event sub-codes */ #define XENKBD_MT_EV_DOWN 0 #define XENKBD_MT_EV_UP 1 #define XENKBD_MT_EV_MOTION 2 #define XENKBD_MT_EV_SYN 3 #define XENKBD_MT_EV_SHAPE 4 #define XENKBD_MT_EV_ORIENT 5 /* * CONSTANTS, XENSTORE FIELD AND PATH NAME STRINGS, HELPERS. */ #define XENKBD_DRIVER_NAME "vkbd" #define XENKBD_FIELD_FEAT_DSBL_KEYBRD "feature-disable-keyboard" #define XENKBD_FIELD_FEAT_DSBL_POINTER "feature-disable-pointer" #define XENKBD_FIELD_FEAT_ABS_POINTER "feature-abs-pointer" #define XENKBD_FIELD_FEAT_RAW_POINTER "feature-raw-pointer" #define XENKBD_FIELD_FEAT_MTOUCH "feature-multi-touch" #define XENKBD_FIELD_REQ_ABS_POINTER "request-abs-pointer" #define XENKBD_FIELD_REQ_RAW_POINTER "request-raw-pointer" #define XENKBD_FIELD_REQ_MTOUCH "request-multi-touch" #define XENKBD_FIELD_RING_GREF "page-gref" #define XENKBD_FIELD_EVT_CHANNEL "event-channel" #define XENKBD_FIELD_WIDTH "width" #define XENKBD_FIELD_HEIGHT "height" #define XENKBD_FIELD_MT_WIDTH "multi-touch-width" #define XENKBD_FIELD_MT_HEIGHT "multi-touch-height" #define XENKBD_FIELD_MT_NUM_CONTACTS "multi-touch-num-contacts" #define XENKBD_FIELD_UNIQUE_ID "unique-id" /* OBSOLETE, not recommended for use */ #define XENKBD_FIELD_RING_REF "page-ref" /* ***************************************************************************** * Description of the protocol between frontend and backend driver. ***************************************************************************** * * The two halves of a Para-virtual driver communicate with * each other using a shared page and an event channel. * Shared page contains a ring with event structures. * * All reserved fields in the structures below must be 0. * ***************************************************************************** * Backend to frontend events ***************************************************************************** * * Frontends should ignore unknown in events. * All event packets have the same length (40 octets) * All event packets have common header: * * 0 octet * +-----------------+ * | type | * +-----------------+ * type - uint8_t, event code, XENKBD_TYPE_??? * * * Pointer relative movement event * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MOTION | reserved | 4 * +----------------+----------------+----------------+----------------+ * | rel_x | 8 * +----------------+----------------+----------------+----------------+ * | rel_y | 12 * +----------------+----------------+----------------+----------------+ * | rel_z | 16 * +----------------+----------------+----------------+----------------+ * | reserved | 20 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * rel_x - int32_t, relative X motion * rel_y - int32_t, relative Y motion * rel_z - int32_t, relative Z motion (wheel) */ struct xenkbd_motion { uint8_t type; int32_t rel_x; int32_t rel_y; int32_t rel_z; }; /* * Key event (includes pointer buttons) * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_KEY | pressed | reserved | 4 * +----------------+----------------+----------------+----------------+ * | keycode | 8 * +----------------+----------------+----------------+----------------+ * | reserved | 12 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * pressed - uint8_t, 1 if pressed; 0 otherwise * keycode - uint32_t, KEY_* from linux/input.h */ struct xenkbd_key { uint8_t type; uint8_t pressed; uint32_t keycode; }; /* * Pointer absolute position event * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_POS | reserved | 4 * +----------------+----------------+----------------+----------------+ * | abs_x | 8 * +----------------+----------------+----------------+----------------+ * | abs_y | 12 * +----------------+----------------+----------------+----------------+ * | rel_z | 16 * +----------------+----------------+----------------+----------------+ * | reserved | 20 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * abs_x - int32_t, absolute X position (in FB pixels) * abs_y - int32_t, absolute Y position (in FB pixels) * rel_z - int32_t, relative Z motion (wheel) */ struct xenkbd_position { uint8_t type; int32_t abs_x; int32_t abs_y; int32_t rel_z; }; /* * Multi-touch event and its sub-types * * All multi-touch event packets have common header: * * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | event_type | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * * event_type - unt8_t, multi-touch event sub-type, XENKBD_MT_EV_??? * contact_id - unt8_t, ID of the contact * * Touch interactions can consist of one or more contacts. * For each contact, a series of events is generated, starting * with a down event, followed by zero or more motion events, * and ending with an up event. Events relating to the same * contact point can be identified by the ID of the sequence: contact ID. * Contact ID may be reused after XENKBD_MT_EV_UP event and * is in the [0; XENKBD_FIELD_NUM_CONTACTS - 1] range. * * For further information please refer to documentation on Wayland [1], * Linux [2] and Windows [3] multi-touch support. * * [1] https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml * [2] https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.rst * [3] https://msdn.microsoft.com/en-us/library/jj151564(v=vs.85).aspx * * * Multi-touch down event - sent when a new touch is made: touch is assigned * a unique contact ID, sent with this and consequent events related * to this touch. * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | _MT_EV_DOWN | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * | abs_x | 12 * +----------------+----------------+----------------+----------------+ * | abs_y | 16 * +----------------+----------------+----------------+----------------+ * | reserved | 20 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * abs_x - int32_t, absolute X position, in pixels * abs_y - int32_t, absolute Y position, in pixels * * Multi-touch contact release event * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | _MT_EV_UP | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * Multi-touch motion event * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | _MT_EV_MOTION | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * | abs_x | 12 * +----------------+----------------+----------------+----------------+ * | abs_y | 16 * +----------------+----------------+----------------+----------------+ * | reserved | 20 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * abs_x - int32_t, absolute X position, in pixels, * abs_y - int32_t, absolute Y position, in pixels, * * Multi-touch input synchronization event - shows end of a set of events * which logically belong together. * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | _MT_EV_SYN | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * Multi-touch shape event - touch point's shape has changed its shape. * Shape is approximated by an ellipse through the major and minor axis * lengths: major is the longer diameter of the ellipse and minor is the * shorter one. Center of the ellipse is reported via * XENKBD_MT_EV_DOWN/XENKBD_MT_EV_MOTION events. * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | _MT_EV_SHAPE | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * | major | 12 * +----------------+----------------+----------------+----------------+ * | minor | 16 * +----------------+----------------+----------------+----------------+ * | reserved | 20 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * major - unt32_t, length of the major axis, pixels * minor - unt32_t, length of the minor axis, pixels * * Multi-touch orientation event - touch point's shape has changed * its orientation: calculated as a clockwise angle between the major axis * of the ellipse and positive Y axis in degrees, [-180; +180]. * 0 1 2 3 octet * +----------------+----------------+----------------+----------------+ * | _TYPE_MTOUCH | _MT_EV_ORIENT | contact_id | reserved | 4 * +----------------+----------------+----------------+----------------+ * | reserved | 8 * +----------------+----------------+----------------+----------------+ * | orientation | reserved | 12 * +----------------+----------------+----------------+----------------+ * | reserved | 16 * +----------------+----------------+----------------+----------------+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/| * +----------------+----------------+----------------+----------------+ * | reserved | 40 * +----------------+----------------+----------------+----------------+ * * orientation - int16_t, clockwise angle of the major axis */ struct xenkbd_mtouch { uint8_t type; /* XENKBD_TYPE_MTOUCH */ uint8_t event_type; /* XENKBD_MT_EV_??? */ uint8_t contact_id; uint8_t reserved[5]; /* reserved for the future use */ union { struct { int32_t abs_x; /* absolute X position, pixels */ int32_t abs_y; /* absolute Y position, pixels */ } pos; struct { uint32_t major; /* length of the major axis, pixels */ uint32_t minor; /* length of the minor axis, pixels */ } shape; int16_t orientation; /* clockwise angle of the major axis */ } u; }; #define XENKBD_IN_EVENT_SIZE 40 union xenkbd_in_event { uint8_t type; struct xenkbd_motion motion; struct xenkbd_key key; struct xenkbd_position pos; struct xenkbd_mtouch mtouch; char pad[XENKBD_IN_EVENT_SIZE]; }; /* ***************************************************************************** * Frontend to backend events ***************************************************************************** * * Out events may be sent only when requested by backend, and receipt * of an unknown out event is an error. * No out events currently defined. * All event packets have the same length (40 octets) * All event packets have common header: * 0 octet * +-----------------+ * | type | * +-----------------+ * type - uint8_t, event code */ #define XENKBD_OUT_EVENT_SIZE 40 union xenkbd_out_event { uint8_t type; char pad[XENKBD_OUT_EVENT_SIZE]; }; /* ***************************************************************************** * Shared page ***************************************************************************** */ #define XENKBD_IN_RING_SIZE 2048 #define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE) #define XENKBD_IN_RING_OFFS 1024 #define XENKBD_IN_RING(page) \ ((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS)) #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) #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]) struct xenkbd_page { uint32_t in_cons, in_prod; uint32_t out_cons, out_prod; }; #endif /* __XEN_PUBLIC_IO_KBDIF_H__ */
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