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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 | /* 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__ */ |