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1/* SPDX-License-Identifier: MIT */
2/*
3 * kbdif.h -- Xen virtual keyboard/mouse
4 *
5 * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
6 * Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
7 */
8
9#ifndef __XEN_PUBLIC_IO_KBDIF_H__
10#define __XEN_PUBLIC_IO_KBDIF_H__
11
12/*
13 *****************************************************************************
14 * Feature and Parameter Negotiation
15 *****************************************************************************
16 *
17 * The two halves of a para-virtual driver utilize nodes within
18 * XenStore to communicate capabilities and to negotiate operating parameters.
19 * This section enumerates these nodes which reside in the respective front and
20 * backend portions of XenStore, following XenBus convention.
21 *
22 * All data in XenStore is stored as strings. Nodes specifying numeric
23 * values are encoded in decimal. Integer value ranges listed below are
24 * expressed as fixed sized integer types capable of storing the conversion
25 * of a properly formated node string, without loss of information.
26 *
27 *****************************************************************************
28 * Backend XenBus Nodes
29 *****************************************************************************
30 *
31 *---------------------------- Features supported ----------------------------
32 *
33 * Capable backend advertises supported features by publishing
34 * corresponding entries in XenStore and puts 1 as the value of the entry.
35 * If a feature is not supported then 0 must be set or feature entry omitted.
36 *
37 * feature-disable-keyboard
38 * Values: <uint>
39 *
40 * If there is no need to expose a virtual keyboard device by the
41 * frontend then this must be set to 1.
42 *
43 * feature-disable-pointer
44 * Values: <uint>
45 *
46 * If there is no need to expose a virtual pointer device by the
47 * frontend then this must be set to 1.
48 *
49 * feature-abs-pointer
50 * Values: <uint>
51 *
52 * Backends, which support reporting of absolute coordinates for pointer
53 * device should set this to 1.
54 *
55 * feature-multi-touch
56 * Values: <uint>
57 *
58 * Backends, which support reporting of multi-touch events
59 * should set this to 1.
60 *
61 * feature-raw-pointer
62 * Values: <uint>
63 *
64 * Backends, which support reporting raw (unscaled) absolute coordinates
65 * for pointer devices should set this to 1. Raw (unscaled) values have
66 * a range of [0, 0x7fff].
67 *
68 *----------------------- Device Instance Parameters ------------------------
69 *
70 * unique-id
71 * Values: <string>
72 *
73 * After device instance initialization it is assigned a unique ID,
74 * so every instance of the frontend can be identified by the backend
75 * by this ID. This can be UUID or such.
76 *
77 *------------------------- Pointer Device Parameters ------------------------
78 *
79 * width
80 * Values: <uint>
81 *
82 * Maximum X coordinate (width) to be used by the frontend
83 * while reporting input events, pixels, [0; UINT32_MAX].
84 *
85 * height
86 * Values: <uint>
87 *
88 * Maximum Y coordinate (height) to be used by the frontend
89 * while reporting input events, pixels, [0; UINT32_MAX].
90 *
91 *----------------------- Multi-touch Device Parameters ----------------------
92 *
93 * multi-touch-num-contacts
94 * Values: <uint>
95 *
96 * Number of simultaneous touches reported.
97 *
98 * multi-touch-width
99 * Values: <uint>
100 *
101 * Width of the touch area to be used by the frontend
102 * while reporting input events, pixels, [0; UINT32_MAX].
103 *
104 * multi-touch-height
105 * Values: <uint>
106 *
107 * Height of the touch area to be used by the frontend
108 * while reporting input events, pixels, [0; UINT32_MAX].
109 *
110 *****************************************************************************
111 * Frontend XenBus Nodes
112 *****************************************************************************
113 *
114 *------------------------------ Feature request -----------------------------
115 *
116 * Capable frontend requests features from backend via setting corresponding
117 * entries to 1 in XenStore. Requests for features not advertised as supported
118 * by the backend have no effect.
119 *
120 * request-abs-pointer
121 * Values: <uint>
122 *
123 * Request backend to report absolute pointer coordinates
124 * (XENKBD_TYPE_POS) instead of relative ones (XENKBD_TYPE_MOTION).
125 *
126 * request-multi-touch
127 * Values: <uint>
128 *
129 * Request backend to report multi-touch events.
130 *
131 * request-raw-pointer
132 * Values: <uint>
133 *
134 * Request backend to report raw unscaled absolute pointer coordinates.
135 * This option is only valid if request-abs-pointer is also set.
136 * Raw unscaled coordinates have the range [0, 0x7fff]
137 *
138 *----------------------- Request Transport Parameters -----------------------
139 *
140 * event-channel
141 * Values: <uint>
142 *
143 * The identifier of the Xen event channel used to signal activity
144 * in the ring buffer.
145 *
146 * page-gref
147 * Values: <uint>
148 *
149 * The Xen grant reference granting permission for the backend to map
150 * a sole page in a single page sized event ring buffer.
151 *
152 * page-ref
153 * Values: <uint>
154 *
155 * OBSOLETE, not recommended for use.
156 * PFN of the shared page.
157 */
158
159/*
160 * EVENT CODES.
161 */
162
163#define XENKBD_TYPE_MOTION 1
164#define XENKBD_TYPE_RESERVED 2
165#define XENKBD_TYPE_KEY 3
166#define XENKBD_TYPE_POS 4
167#define XENKBD_TYPE_MTOUCH 5
168
169/* Multi-touch event sub-codes */
170
171#define XENKBD_MT_EV_DOWN 0
172#define XENKBD_MT_EV_UP 1
173#define XENKBD_MT_EV_MOTION 2
174#define XENKBD_MT_EV_SYN 3
175#define XENKBD_MT_EV_SHAPE 4
176#define XENKBD_MT_EV_ORIENT 5
177
178/*
179 * CONSTANTS, XENSTORE FIELD AND PATH NAME STRINGS, HELPERS.
180 */
181
182#define XENKBD_DRIVER_NAME "vkbd"
183
184#define XENKBD_FIELD_FEAT_DSBL_KEYBRD "feature-disable-keyboard"
185#define XENKBD_FIELD_FEAT_DSBL_POINTER "feature-disable-pointer"
186#define XENKBD_FIELD_FEAT_ABS_POINTER "feature-abs-pointer"
187#define XENKBD_FIELD_FEAT_RAW_POINTER "feature-raw-pointer"
188#define XENKBD_FIELD_FEAT_MTOUCH "feature-multi-touch"
189#define XENKBD_FIELD_REQ_ABS_POINTER "request-abs-pointer"
190#define XENKBD_FIELD_REQ_RAW_POINTER "request-raw-pointer"
191#define XENKBD_FIELD_REQ_MTOUCH "request-multi-touch"
192#define XENKBD_FIELD_RING_GREF "page-gref"
193#define XENKBD_FIELD_EVT_CHANNEL "event-channel"
194#define XENKBD_FIELD_WIDTH "width"
195#define XENKBD_FIELD_HEIGHT "height"
196#define XENKBD_FIELD_MT_WIDTH "multi-touch-width"
197#define XENKBD_FIELD_MT_HEIGHT "multi-touch-height"
198#define XENKBD_FIELD_MT_NUM_CONTACTS "multi-touch-num-contacts"
199#define XENKBD_FIELD_UNIQUE_ID "unique-id"
200
201/* OBSOLETE, not recommended for use */
202#define XENKBD_FIELD_RING_REF "page-ref"
203
204/*
205 *****************************************************************************
206 * Description of the protocol between frontend and backend driver.
207 *****************************************************************************
208 *
209 * The two halves of a Para-virtual driver communicate with
210 * each other using a shared page and an event channel.
211 * Shared page contains a ring with event structures.
212 *
213 * All reserved fields in the structures below must be 0.
214 *
215 *****************************************************************************
216 * Backend to frontend events
217 *****************************************************************************
218 *
219 * Frontends should ignore unknown in events.
220 * All event packets have the same length (40 octets)
221 * All event packets have common header:
222 *
223 * 0 octet
224 * +-----------------+
225 * | type |
226 * +-----------------+
227 * type - uint8_t, event code, XENKBD_TYPE_???
228 *
229 *
230 * Pointer relative movement event
231 * 0 1 2 3 octet
232 * +----------------+----------------+----------------+----------------+
233 * | _TYPE_MOTION | reserved | 4
234 * +----------------+----------------+----------------+----------------+
235 * | rel_x | 8
236 * +----------------+----------------+----------------+----------------+
237 * | rel_y | 12
238 * +----------------+----------------+----------------+----------------+
239 * | rel_z | 16
240 * +----------------+----------------+----------------+----------------+
241 * | reserved | 20
242 * +----------------+----------------+----------------+----------------+
243 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
244 * +----------------+----------------+----------------+----------------+
245 * | reserved | 40
246 * +----------------+----------------+----------------+----------------+
247 *
248 * rel_x - int32_t, relative X motion
249 * rel_y - int32_t, relative Y motion
250 * rel_z - int32_t, relative Z motion (wheel)
251 */
252
253struct xenkbd_motion {
254 uint8_t type;
255 int32_t rel_x;
256 int32_t rel_y;
257 int32_t rel_z;
258};
259
260/*
261 * Key event (includes pointer buttons)
262 * 0 1 2 3 octet
263 * +----------------+----------------+----------------+----------------+
264 * | _TYPE_KEY | pressed | reserved | 4
265 * +----------------+----------------+----------------+----------------+
266 * | keycode | 8
267 * +----------------+----------------+----------------+----------------+
268 * | reserved | 12
269 * +----------------+----------------+----------------+----------------+
270 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
271 * +----------------+----------------+----------------+----------------+
272 * | reserved | 40
273 * +----------------+----------------+----------------+----------------+
274 *
275 * pressed - uint8_t, 1 if pressed; 0 otherwise
276 * keycode - uint32_t, KEY_* from linux/input.h
277 */
278
279struct xenkbd_key {
280 uint8_t type;
281 uint8_t pressed;
282 uint32_t keycode;
283};
284
285/*
286 * Pointer absolute position event
287 * 0 1 2 3 octet
288 * +----------------+----------------+----------------+----------------+
289 * | _TYPE_POS | reserved | 4
290 * +----------------+----------------+----------------+----------------+
291 * | abs_x | 8
292 * +----------------+----------------+----------------+----------------+
293 * | abs_y | 12
294 * +----------------+----------------+----------------+----------------+
295 * | rel_z | 16
296 * +----------------+----------------+----------------+----------------+
297 * | reserved | 20
298 * +----------------+----------------+----------------+----------------+
299 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
300 * +----------------+----------------+----------------+----------------+
301 * | reserved | 40
302 * +----------------+----------------+----------------+----------------+
303 *
304 * abs_x - int32_t, absolute X position (in FB pixels)
305 * abs_y - int32_t, absolute Y position (in FB pixels)
306 * rel_z - int32_t, relative Z motion (wheel)
307 */
308
309struct xenkbd_position {
310 uint8_t type;
311 int32_t abs_x;
312 int32_t abs_y;
313 int32_t rel_z;
314};
315
316/*
317 * Multi-touch event and its sub-types
318 *
319 * All multi-touch event packets have common header:
320 *
321 * 0 1 2 3 octet
322 * +----------------+----------------+----------------+----------------+
323 * | _TYPE_MTOUCH | event_type | contact_id | reserved | 4
324 * +----------------+----------------+----------------+----------------+
325 * | reserved | 8
326 * +----------------+----------------+----------------+----------------+
327 *
328 * event_type - unt8_t, multi-touch event sub-type, XENKBD_MT_EV_???
329 * contact_id - unt8_t, ID of the contact
330 *
331 * Touch interactions can consist of one or more contacts.
332 * For each contact, a series of events is generated, starting
333 * with a down event, followed by zero or more motion events,
334 * and ending with an up event. Events relating to the same
335 * contact point can be identified by the ID of the sequence: contact ID.
336 * Contact ID may be reused after XENKBD_MT_EV_UP event and
337 * is in the [0; XENKBD_FIELD_NUM_CONTACTS - 1] range.
338 *
339 * For further information please refer to documentation on Wayland [1],
340 * Linux [2] and Windows [3] multi-touch support.
341 *
342 * [1] https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml
343 * [2] https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.rst
344 * [3] https://msdn.microsoft.com/en-us/library/jj151564(v=vs.85).aspx
345 *
346 *
347 * Multi-touch down event - sent when a new touch is made: touch is assigned
348 * a unique contact ID, sent with this and consequent events related
349 * to this touch.
350 * 0 1 2 3 octet
351 * +----------------+----------------+----------------+----------------+
352 * | _TYPE_MTOUCH | _MT_EV_DOWN | contact_id | reserved | 4
353 * +----------------+----------------+----------------+----------------+
354 * | reserved | 8
355 * +----------------+----------------+----------------+----------------+
356 * | abs_x | 12
357 * +----------------+----------------+----------------+----------------+
358 * | abs_y | 16
359 * +----------------+----------------+----------------+----------------+
360 * | reserved | 20
361 * +----------------+----------------+----------------+----------------+
362 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
363 * +----------------+----------------+----------------+----------------+
364 * | reserved | 40
365 * +----------------+----------------+----------------+----------------+
366 *
367 * abs_x - int32_t, absolute X position, in pixels
368 * abs_y - int32_t, absolute Y position, in pixels
369 *
370 * Multi-touch contact release event
371 * 0 1 2 3 octet
372 * +----------------+----------------+----------------+----------------+
373 * | _TYPE_MTOUCH | _MT_EV_UP | contact_id | reserved | 4
374 * +----------------+----------------+----------------+----------------+
375 * | reserved | 8
376 * +----------------+----------------+----------------+----------------+
377 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
378 * +----------------+----------------+----------------+----------------+
379 * | reserved | 40
380 * +----------------+----------------+----------------+----------------+
381 *
382 * Multi-touch motion event
383 * 0 1 2 3 octet
384 * +----------------+----------------+----------------+----------------+
385 * | _TYPE_MTOUCH | _MT_EV_MOTION | contact_id | reserved | 4
386 * +----------------+----------------+----------------+----------------+
387 * | reserved | 8
388 * +----------------+----------------+----------------+----------------+
389 * | abs_x | 12
390 * +----------------+----------------+----------------+----------------+
391 * | abs_y | 16
392 * +----------------+----------------+----------------+----------------+
393 * | reserved | 20
394 * +----------------+----------------+----------------+----------------+
395 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
396 * +----------------+----------------+----------------+----------------+
397 * | reserved | 40
398 * +----------------+----------------+----------------+----------------+
399 *
400 * abs_x - int32_t, absolute X position, in pixels,
401 * abs_y - int32_t, absolute Y position, in pixels,
402 *
403 * Multi-touch input synchronization event - shows end of a set of events
404 * which logically belong together.
405 * 0 1 2 3 octet
406 * +----------------+----------------+----------------+----------------+
407 * | _TYPE_MTOUCH | _MT_EV_SYN | contact_id | reserved | 4
408 * +----------------+----------------+----------------+----------------+
409 * | reserved | 8
410 * +----------------+----------------+----------------+----------------+
411 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
412 * +----------------+----------------+----------------+----------------+
413 * | reserved | 40
414 * +----------------+----------------+----------------+----------------+
415 *
416 * Multi-touch shape event - touch point's shape has changed its shape.
417 * Shape is approximated by an ellipse through the major and minor axis
418 * lengths: major is the longer diameter of the ellipse and minor is the
419 * shorter one. Center of the ellipse is reported via
420 * XENKBD_MT_EV_DOWN/XENKBD_MT_EV_MOTION events.
421 * 0 1 2 3 octet
422 * +----------------+----------------+----------------+----------------+
423 * | _TYPE_MTOUCH | _MT_EV_SHAPE | contact_id | reserved | 4
424 * +----------------+----------------+----------------+----------------+
425 * | reserved | 8
426 * +----------------+----------------+----------------+----------------+
427 * | major | 12
428 * +----------------+----------------+----------------+----------------+
429 * | minor | 16
430 * +----------------+----------------+----------------+----------------+
431 * | reserved | 20
432 * +----------------+----------------+----------------+----------------+
433 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
434 * +----------------+----------------+----------------+----------------+
435 * | reserved | 40
436 * +----------------+----------------+----------------+----------------+
437 *
438 * major - unt32_t, length of the major axis, pixels
439 * minor - unt32_t, length of the minor axis, pixels
440 *
441 * Multi-touch orientation event - touch point's shape has changed
442 * its orientation: calculated as a clockwise angle between the major axis
443 * of the ellipse and positive Y axis in degrees, [-180; +180].
444 * 0 1 2 3 octet
445 * +----------------+----------------+----------------+----------------+
446 * | _TYPE_MTOUCH | _MT_EV_ORIENT | contact_id | reserved | 4
447 * +----------------+----------------+----------------+----------------+
448 * | reserved | 8
449 * +----------------+----------------+----------------+----------------+
450 * | orientation | reserved | 12
451 * +----------------+----------------+----------------+----------------+
452 * | reserved | 16
453 * +----------------+----------------+----------------+----------------+
454 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
455 * +----------------+----------------+----------------+----------------+
456 * | reserved | 40
457 * +----------------+----------------+----------------+----------------+
458 *
459 * orientation - int16_t, clockwise angle of the major axis
460 */
461
462struct xenkbd_mtouch {
463 uint8_t type; /* XENKBD_TYPE_MTOUCH */
464 uint8_t event_type; /* XENKBD_MT_EV_??? */
465 uint8_t contact_id;
466 uint8_t reserved[5]; /* reserved for the future use */
467 union {
468 struct {
469 int32_t abs_x; /* absolute X position, pixels */
470 int32_t abs_y; /* absolute Y position, pixels */
471 } pos;
472 struct {
473 uint32_t major; /* length of the major axis, pixels */
474 uint32_t minor; /* length of the minor axis, pixels */
475 } shape;
476 int16_t orientation; /* clockwise angle of the major axis */
477 } u;
478};
479
480#define XENKBD_IN_EVENT_SIZE 40
481
482union xenkbd_in_event {
483 uint8_t type;
484 struct xenkbd_motion motion;
485 struct xenkbd_key key;
486 struct xenkbd_position pos;
487 struct xenkbd_mtouch mtouch;
488 char pad[XENKBD_IN_EVENT_SIZE];
489};
490
491/*
492 *****************************************************************************
493 * Frontend to backend events
494 *****************************************************************************
495 *
496 * Out events may be sent only when requested by backend, and receipt
497 * of an unknown out event is an error.
498 * No out events currently defined.
499
500 * All event packets have the same length (40 octets)
501 * All event packets have common header:
502 * 0 octet
503 * +-----------------+
504 * | type |
505 * +-----------------+
506 * type - uint8_t, event code
507 */
508
509#define XENKBD_OUT_EVENT_SIZE 40
510
511union xenkbd_out_event {
512 uint8_t type;
513 char pad[XENKBD_OUT_EVENT_SIZE];
514};
515
516/*
517 *****************************************************************************
518 * Shared page
519 *****************************************************************************
520 */
521
522#define XENKBD_IN_RING_SIZE 2048
523#define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
524#define XENKBD_IN_RING_OFFS 1024
525#define XENKBD_IN_RING(page) \
526 ((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS))
527#define XENKBD_IN_RING_REF(page, idx) \
528 (XENKBD_IN_RING((page))[(idx) % XENKBD_IN_RING_LEN])
529
530#define XENKBD_OUT_RING_SIZE 1024
531#define XENKBD_OUT_RING_LEN (XENKBD_OUT_RING_SIZE / XENKBD_OUT_EVENT_SIZE)
532#define XENKBD_OUT_RING_OFFS (XENKBD_IN_RING_OFFS + XENKBD_IN_RING_SIZE)
533#define XENKBD_OUT_RING(page) \
534 ((union xenkbd_out_event *)((char *)(page) + XENKBD_OUT_RING_OFFS))
535#define XENKBD_OUT_RING_REF(page, idx) \
536 (XENKBD_OUT_RING((page))[(idx) % XENKBD_OUT_RING_LEN])
537
538struct xenkbd_page {
539 uint32_t in_cons, in_prod;
540 uint32_t out_cons, out_prod;
541};
542
543#endif /* __XEN_PUBLIC_IO_KBDIF_H__ */
1/*
2 * kbdif.h -- Xen virtual keyboard/mouse
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 *
22 * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
23 * Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
24 */
25
26#ifndef __XEN_PUBLIC_IO_KBDIF_H__
27#define __XEN_PUBLIC_IO_KBDIF_H__
28
29/*
30 *****************************************************************************
31 * Feature and Parameter Negotiation
32 *****************************************************************************
33 *
34 * The two halves of a para-virtual driver utilize nodes within
35 * XenStore to communicate capabilities and to negotiate operating parameters.
36 * This section enumerates these nodes which reside in the respective front and
37 * backend portions of XenStore, following XenBus convention.
38 *
39 * All data in XenStore is stored as strings. Nodes specifying numeric
40 * values are encoded in decimal. Integer value ranges listed below are
41 * expressed as fixed sized integer types capable of storing the conversion
42 * of a properly formated node string, without loss of information.
43 *
44 *****************************************************************************
45 * Backend XenBus Nodes
46 *****************************************************************************
47 *
48 *---------------------------- Features supported ----------------------------
49 *
50 * Capable backend advertises supported features by publishing
51 * corresponding entries in XenStore and puts 1 as the value of the entry.
52 * If a feature is not supported then 0 must be set or feature entry omitted.
53 *
54 * feature-disable-keyboard
55 * Values: <uint>
56 *
57 * If there is no need to expose a virtual keyboard device by the
58 * frontend then this must be set to 1.
59 *
60 * feature-disable-pointer
61 * Values: <uint>
62 *
63 * If there is no need to expose a virtual pointer device by the
64 * frontend then this must be set to 1.
65 *
66 * feature-abs-pointer
67 * Values: <uint>
68 *
69 * Backends, which support reporting of absolute coordinates for pointer
70 * device should set this to 1.
71 *
72 * feature-multi-touch
73 * Values: <uint>
74 *
75 * Backends, which support reporting of multi-touch events
76 * should set this to 1.
77 *
78 * feature-raw-pointer
79 * Values: <uint>
80 *
81 * Backends, which support reporting raw (unscaled) absolute coordinates
82 * for pointer devices should set this to 1. Raw (unscaled) values have
83 * a range of [0, 0x7fff].
84 *
85 *----------------------- Device Instance Parameters ------------------------
86 *
87 * unique-id
88 * Values: <string>
89 *
90 * After device instance initialization it is assigned a unique ID,
91 * so every instance of the frontend can be identified by the backend
92 * by this ID. This can be UUID or such.
93 *
94 *------------------------- Pointer Device Parameters ------------------------
95 *
96 * width
97 * Values: <uint>
98 *
99 * Maximum X coordinate (width) to be used by the frontend
100 * while reporting input events, pixels, [0; UINT32_MAX].
101 *
102 * height
103 * Values: <uint>
104 *
105 * Maximum Y coordinate (height) to be used by the frontend
106 * while reporting input events, pixels, [0; UINT32_MAX].
107 *
108 *----------------------- Multi-touch Device Parameters ----------------------
109 *
110 * multi-touch-num-contacts
111 * Values: <uint>
112 *
113 * Number of simultaneous touches reported.
114 *
115 * multi-touch-width
116 * Values: <uint>
117 *
118 * Width of the touch area to be used by the frontend
119 * while reporting input events, pixels, [0; UINT32_MAX].
120 *
121 * multi-touch-height
122 * Values: <uint>
123 *
124 * Height of the touch area to be used by the frontend
125 * while reporting input events, pixels, [0; UINT32_MAX].
126 *
127 *****************************************************************************
128 * Frontend XenBus Nodes
129 *****************************************************************************
130 *
131 *------------------------------ Feature request -----------------------------
132 *
133 * Capable frontend requests features from backend via setting corresponding
134 * entries to 1 in XenStore. Requests for features not advertised as supported
135 * by the backend have no effect.
136 *
137 * request-abs-pointer
138 * Values: <uint>
139 *
140 * Request backend to report absolute pointer coordinates
141 * (XENKBD_TYPE_POS) instead of relative ones (XENKBD_TYPE_MOTION).
142 *
143 * request-multi-touch
144 * Values: <uint>
145 *
146 * Request backend to report multi-touch events.
147 *
148 * request-raw-pointer
149 * Values: <uint>
150 *
151 * Request backend to report raw unscaled absolute pointer coordinates.
152 * This option is only valid if request-abs-pointer is also set.
153 * Raw unscaled coordinates have the range [0, 0x7fff]
154 *
155 *----------------------- Request Transport Parameters -----------------------
156 *
157 * event-channel
158 * Values: <uint>
159 *
160 * The identifier of the Xen event channel used to signal activity
161 * in the ring buffer.
162 *
163 * page-gref
164 * Values: <uint>
165 *
166 * The Xen grant reference granting permission for the backend to map
167 * a sole page in a single page sized event ring buffer.
168 *
169 * page-ref
170 * Values: <uint>
171 *
172 * OBSOLETE, not recommended for use.
173 * PFN of the shared page.
174 */
175
176/*
177 * EVENT CODES.
178 */
179
180#define XENKBD_TYPE_MOTION 1
181#define XENKBD_TYPE_RESERVED 2
182#define XENKBD_TYPE_KEY 3
183#define XENKBD_TYPE_POS 4
184#define XENKBD_TYPE_MTOUCH 5
185
186/* Multi-touch event sub-codes */
187
188#define XENKBD_MT_EV_DOWN 0
189#define XENKBD_MT_EV_UP 1
190#define XENKBD_MT_EV_MOTION 2
191#define XENKBD_MT_EV_SYN 3
192#define XENKBD_MT_EV_SHAPE 4
193#define XENKBD_MT_EV_ORIENT 5
194
195/*
196 * CONSTANTS, XENSTORE FIELD AND PATH NAME STRINGS, HELPERS.
197 */
198
199#define XENKBD_DRIVER_NAME "vkbd"
200
201#define XENKBD_FIELD_FEAT_DSBL_KEYBRD "feature-disable-keyboard"
202#define XENKBD_FIELD_FEAT_DSBL_POINTER "feature-disable-pointer"
203#define XENKBD_FIELD_FEAT_ABS_POINTER "feature-abs-pointer"
204#define XENKBD_FIELD_FEAT_RAW_POINTER "feature-raw-pointer"
205#define XENKBD_FIELD_FEAT_MTOUCH "feature-multi-touch"
206#define XENKBD_FIELD_REQ_ABS_POINTER "request-abs-pointer"
207#define XENKBD_FIELD_REQ_RAW_POINTER "request-raw-pointer"
208#define XENKBD_FIELD_REQ_MTOUCH "request-multi-touch"
209#define XENKBD_FIELD_RING_GREF "page-gref"
210#define XENKBD_FIELD_EVT_CHANNEL "event-channel"
211#define XENKBD_FIELD_WIDTH "width"
212#define XENKBD_FIELD_HEIGHT "height"
213#define XENKBD_FIELD_MT_WIDTH "multi-touch-width"
214#define XENKBD_FIELD_MT_HEIGHT "multi-touch-height"
215#define XENKBD_FIELD_MT_NUM_CONTACTS "multi-touch-num-contacts"
216#define XENKBD_FIELD_UNIQUE_ID "unique-id"
217
218/* OBSOLETE, not recommended for use */
219#define XENKBD_FIELD_RING_REF "page-ref"
220
221/*
222 *****************************************************************************
223 * Description of the protocol between frontend and backend driver.
224 *****************************************************************************
225 *
226 * The two halves of a Para-virtual driver communicate with
227 * each other using a shared page and an event channel.
228 * Shared page contains a ring with event structures.
229 *
230 * All reserved fields in the structures below must be 0.
231 *
232 *****************************************************************************
233 * Backend to frontend events
234 *****************************************************************************
235 *
236 * Frontends should ignore unknown in events.
237 * All event packets have the same length (40 octets)
238 * All event packets have common header:
239 *
240 * 0 octet
241 * +-----------------+
242 * | type |
243 * +-----------------+
244 * type - uint8_t, event code, XENKBD_TYPE_???
245 *
246 *
247 * Pointer relative movement event
248 * 0 1 2 3 octet
249 * +----------------+----------------+----------------+----------------+
250 * | _TYPE_MOTION | reserved | 4
251 * +----------------+----------------+----------------+----------------+
252 * | rel_x | 8
253 * +----------------+----------------+----------------+----------------+
254 * | rel_y | 12
255 * +----------------+----------------+----------------+----------------+
256 * | rel_z | 16
257 * +----------------+----------------+----------------+----------------+
258 * | reserved | 20
259 * +----------------+----------------+----------------+----------------+
260 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
261 * +----------------+----------------+----------------+----------------+
262 * | reserved | 40
263 * +----------------+----------------+----------------+----------------+
264 *
265 * rel_x - int32_t, relative X motion
266 * rel_y - int32_t, relative Y motion
267 * rel_z - int32_t, relative Z motion (wheel)
268 */
269
270struct xenkbd_motion {
271 uint8_t type;
272 int32_t rel_x;
273 int32_t rel_y;
274 int32_t rel_z;
275};
276
277/*
278 * Key event (includes pointer buttons)
279 * 0 1 2 3 octet
280 * +----------------+----------------+----------------+----------------+
281 * | _TYPE_KEY | pressed | reserved | 4
282 * +----------------+----------------+----------------+----------------+
283 * | keycode | 8
284 * +----------------+----------------+----------------+----------------+
285 * | reserved | 12
286 * +----------------+----------------+----------------+----------------+
287 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
288 * +----------------+----------------+----------------+----------------+
289 * | reserved | 40
290 * +----------------+----------------+----------------+----------------+
291 *
292 * pressed - uint8_t, 1 if pressed; 0 otherwise
293 * keycode - uint32_t, KEY_* from linux/input.h
294 */
295
296struct xenkbd_key {
297 uint8_t type;
298 uint8_t pressed;
299 uint32_t keycode;
300};
301
302/*
303 * Pointer absolute position event
304 * 0 1 2 3 octet
305 * +----------------+----------------+----------------+----------------+
306 * | _TYPE_POS | reserved | 4
307 * +----------------+----------------+----------------+----------------+
308 * | abs_x | 8
309 * +----------------+----------------+----------------+----------------+
310 * | abs_y | 12
311 * +----------------+----------------+----------------+----------------+
312 * | rel_z | 16
313 * +----------------+----------------+----------------+----------------+
314 * | reserved | 20
315 * +----------------+----------------+----------------+----------------+
316 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
317 * +----------------+----------------+----------------+----------------+
318 * | reserved | 40
319 * +----------------+----------------+----------------+----------------+
320 *
321 * abs_x - int32_t, absolute X position (in FB pixels)
322 * abs_y - int32_t, absolute Y position (in FB pixels)
323 * rel_z - int32_t, relative Z motion (wheel)
324 */
325
326struct xenkbd_position {
327 uint8_t type;
328 int32_t abs_x;
329 int32_t abs_y;
330 int32_t rel_z;
331};
332
333/*
334 * Multi-touch event and its sub-types
335 *
336 * All multi-touch event packets have common header:
337 *
338 * 0 1 2 3 octet
339 * +----------------+----------------+----------------+----------------+
340 * | _TYPE_MTOUCH | event_type | contact_id | reserved | 4
341 * +----------------+----------------+----------------+----------------+
342 * | reserved | 8
343 * +----------------+----------------+----------------+----------------+
344 *
345 * event_type - unt8_t, multi-touch event sub-type, XENKBD_MT_EV_???
346 * contact_id - unt8_t, ID of the contact
347 *
348 * Touch interactions can consist of one or more contacts.
349 * For each contact, a series of events is generated, starting
350 * with a down event, followed by zero or more motion events,
351 * and ending with an up event. Events relating to the same
352 * contact point can be identified by the ID of the sequence: contact ID.
353 * Contact ID may be reused after XENKBD_MT_EV_UP event and
354 * is in the [0; XENKBD_FIELD_NUM_CONTACTS - 1] range.
355 *
356 * For further information please refer to documentation on Wayland [1],
357 * Linux [2] and Windows [3] multi-touch support.
358 *
359 * [1] https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml
360 * [2] https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.rst
361 * [3] https://msdn.microsoft.com/en-us/library/jj151564(v=vs.85).aspx
362 *
363 *
364 * Multi-touch down event - sent when a new touch is made: touch is assigned
365 * a unique contact ID, sent with this and consequent events related
366 * to this touch.
367 * 0 1 2 3 octet
368 * +----------------+----------------+----------------+----------------+
369 * | _TYPE_MTOUCH | _MT_EV_DOWN | contact_id | reserved | 4
370 * +----------------+----------------+----------------+----------------+
371 * | reserved | 8
372 * +----------------+----------------+----------------+----------------+
373 * | abs_x | 12
374 * +----------------+----------------+----------------+----------------+
375 * | abs_y | 16
376 * +----------------+----------------+----------------+----------------+
377 * | reserved | 20
378 * +----------------+----------------+----------------+----------------+
379 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
380 * +----------------+----------------+----------------+----------------+
381 * | reserved | 40
382 * +----------------+----------------+----------------+----------------+
383 *
384 * abs_x - int32_t, absolute X position, in pixels
385 * abs_y - int32_t, absolute Y position, in pixels
386 *
387 * Multi-touch contact release event
388 * 0 1 2 3 octet
389 * +----------------+----------------+----------------+----------------+
390 * | _TYPE_MTOUCH | _MT_EV_UP | contact_id | reserved | 4
391 * +----------------+----------------+----------------+----------------+
392 * | reserved | 8
393 * +----------------+----------------+----------------+----------------+
394 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
395 * +----------------+----------------+----------------+----------------+
396 * | reserved | 40
397 * +----------------+----------------+----------------+----------------+
398 *
399 * Multi-touch motion event
400 * 0 1 2 3 octet
401 * +----------------+----------------+----------------+----------------+
402 * | _TYPE_MTOUCH | _MT_EV_MOTION | contact_id | reserved | 4
403 * +----------------+----------------+----------------+----------------+
404 * | reserved | 8
405 * +----------------+----------------+----------------+----------------+
406 * | abs_x | 12
407 * +----------------+----------------+----------------+----------------+
408 * | abs_y | 16
409 * +----------------+----------------+----------------+----------------+
410 * | reserved | 20
411 * +----------------+----------------+----------------+----------------+
412 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
413 * +----------------+----------------+----------------+----------------+
414 * | reserved | 40
415 * +----------------+----------------+----------------+----------------+
416 *
417 * abs_x - int32_t, absolute X position, in pixels,
418 * abs_y - int32_t, absolute Y position, in pixels,
419 *
420 * Multi-touch input synchronization event - shows end of a set of events
421 * which logically belong together.
422 * 0 1 2 3 octet
423 * +----------------+----------------+----------------+----------------+
424 * | _TYPE_MTOUCH | _MT_EV_SYN | contact_id | reserved | 4
425 * +----------------+----------------+----------------+----------------+
426 * | reserved | 8
427 * +----------------+----------------+----------------+----------------+
428 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
429 * +----------------+----------------+----------------+----------------+
430 * | reserved | 40
431 * +----------------+----------------+----------------+----------------+
432 *
433 * Multi-touch shape event - touch point's shape has changed its shape.
434 * Shape is approximated by an ellipse through the major and minor axis
435 * lengths: major is the longer diameter of the ellipse and minor is the
436 * shorter one. Center of the ellipse is reported via
437 * XENKBD_MT_EV_DOWN/XENKBD_MT_EV_MOTION events.
438 * 0 1 2 3 octet
439 * +----------------+----------------+----------------+----------------+
440 * | _TYPE_MTOUCH | _MT_EV_SHAPE | contact_id | reserved | 4
441 * +----------------+----------------+----------------+----------------+
442 * | reserved | 8
443 * +----------------+----------------+----------------+----------------+
444 * | major | 12
445 * +----------------+----------------+----------------+----------------+
446 * | minor | 16
447 * +----------------+----------------+----------------+----------------+
448 * | reserved | 20
449 * +----------------+----------------+----------------+----------------+
450 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
451 * +----------------+----------------+----------------+----------------+
452 * | reserved | 40
453 * +----------------+----------------+----------------+----------------+
454 *
455 * major - unt32_t, length of the major axis, pixels
456 * minor - unt32_t, length of the minor axis, pixels
457 *
458 * Multi-touch orientation event - touch point's shape has changed
459 * its orientation: calculated as a clockwise angle between the major axis
460 * of the ellipse and positive Y axis in degrees, [-180; +180].
461 * 0 1 2 3 octet
462 * +----------------+----------------+----------------+----------------+
463 * | _TYPE_MTOUCH | _MT_EV_ORIENT | contact_id | reserved | 4
464 * +----------------+----------------+----------------+----------------+
465 * | reserved | 8
466 * +----------------+----------------+----------------+----------------+
467 * | orientation | reserved | 12
468 * +----------------+----------------+----------------+----------------+
469 * | reserved | 16
470 * +----------------+----------------+----------------+----------------+
471 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
472 * +----------------+----------------+----------------+----------------+
473 * | reserved | 40
474 * +----------------+----------------+----------------+----------------+
475 *
476 * orientation - int16_t, clockwise angle of the major axis
477 */
478
479struct xenkbd_mtouch {
480 uint8_t type; /* XENKBD_TYPE_MTOUCH */
481 uint8_t event_type; /* XENKBD_MT_EV_??? */
482 uint8_t contact_id;
483 uint8_t reserved[5]; /* reserved for the future use */
484 union {
485 struct {
486 int32_t abs_x; /* absolute X position, pixels */
487 int32_t abs_y; /* absolute Y position, pixels */
488 } pos;
489 struct {
490 uint32_t major; /* length of the major axis, pixels */
491 uint32_t minor; /* length of the minor axis, pixels */
492 } shape;
493 int16_t orientation; /* clockwise angle of the major axis */
494 } u;
495};
496
497#define XENKBD_IN_EVENT_SIZE 40
498
499union xenkbd_in_event {
500 uint8_t type;
501 struct xenkbd_motion motion;
502 struct xenkbd_key key;
503 struct xenkbd_position pos;
504 struct xenkbd_mtouch mtouch;
505 char pad[XENKBD_IN_EVENT_SIZE];
506};
507
508/*
509 *****************************************************************************
510 * Frontend to backend events
511 *****************************************************************************
512 *
513 * Out events may be sent only when requested by backend, and receipt
514 * of an unknown out event is an error.
515 * No out events currently defined.
516
517 * All event packets have the same length (40 octets)
518 * All event packets have common header:
519 * 0 octet
520 * +-----------------+
521 * | type |
522 * +-----------------+
523 * type - uint8_t, event code
524 */
525
526#define XENKBD_OUT_EVENT_SIZE 40
527
528union xenkbd_out_event {
529 uint8_t type;
530 char pad[XENKBD_OUT_EVENT_SIZE];
531};
532
533/*
534 *****************************************************************************
535 * Shared page
536 *****************************************************************************
537 */
538
539#define XENKBD_IN_RING_SIZE 2048
540#define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
541#define XENKBD_IN_RING_OFFS 1024
542#define XENKBD_IN_RING(page) \
543 ((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS))
544#define XENKBD_IN_RING_REF(page, idx) \
545 (XENKBD_IN_RING((page))[(idx) % XENKBD_IN_RING_LEN])
546
547#define XENKBD_OUT_RING_SIZE 1024
548#define XENKBD_OUT_RING_LEN (XENKBD_OUT_RING_SIZE / XENKBD_OUT_EVENT_SIZE)
549#define XENKBD_OUT_RING_OFFS (XENKBD_IN_RING_OFFS + XENKBD_IN_RING_SIZE)
550#define XENKBD_OUT_RING(page) \
551 ((union xenkbd_out_event *)((char *)(page) + XENKBD_OUT_RING_OFFS))
552#define XENKBD_OUT_RING_REF(page, idx) \
553 (XENKBD_OUT_RING((page))[(idx) % XENKBD_OUT_RING_LEN])
554
555struct xenkbd_page {
556 uint32_t in_cons, in_prod;
557 uint32_t out_cons, out_prod;
558};
559
560#endif /* __XEN_PUBLIC_IO_KBDIF_H__ */