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Diffstat (limited to 'include/xen/interface/io/kbdif.h')
| -rw-r--r-- | include/xen/interface/io/kbdif.h | 560 |
1 files changed, 560 insertions, 0 deletions
diff --git a/include/xen/interface/io/kbdif.h b/include/xen/interface/io/kbdif.h new file mode 100644 index 000000000..5c7630d73 --- /dev/null +++ b/include/xen/interface/io/kbdif.h @@ -0,0 +1,560 @@ +/* + * kbdif.h -- Xen virtual keyboard/mouse + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * 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__ */ |