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-rw-r--r--include/xen/interface/io/kbdif.h458
1 files changed, 431 insertions, 27 deletions
diff --git a/include/xen/interface/io/kbdif.h b/include/xen/interface/io/kbdif.h
index 8066c7849fbe..2a9510ade701 100644
--- a/include/xen/interface/io/kbdif.h
+++ b/include/xen/interface/io/kbdif.h
@@ -26,43 +26,432 @@
#ifndef __XEN_PUBLIC_IO_KBDIF_H__
#define __XEN_PUBLIC_IO_KBDIF_H__
-/* In events (backend -> frontend) */
+/*
+ *****************************************************************************
+ * 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-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.
+ *
+ *------------------------- 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].
+ *
+ *****************************************************************************
+ * 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 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.
+ *
+ *----------------------- 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].
+ */
/*
- * Frontends should ignore unknown in events.
+ * EVENT CODES.
*/
-/* Pointer movement event */
-#define XENKBD_TYPE_MOTION 1
-/* Event type 2 currently not used */
-/* Key event (includes pointer buttons) */
-#define XENKBD_TYPE_KEY 3
+#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_ABS_POINTER "feature-abs-pointer"
+#define XENKBD_FIELD_FEAT_MTOUCH "feature-multi-touch"
+#define XENKBD_FIELD_REQ_ABS_POINTER "request-abs-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"
+
+/* OBSOLETE, not recommended for use */
+#define XENKBD_FIELD_RING_REF "page-ref"
+
/*
- * Pointer position event
- * Capable backend sets feature-abs-pointer in xenstore.
- * Frontend requests ot instead of XENKBD_TYPE_MOTION by setting
- * request-abs-update in xenstore.
+ *****************************************************************************
+ * 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)
*/
-#define XENKBD_TYPE_POS 4
struct xenkbd_motion {
- uint8_t type; /* XENKBD_TYPE_MOTION */
- int32_t rel_x; /* relative X motion */
- int32_t rel_y; /* relative Y motion */
- int32_t rel_z; /* relative Z motion (wheel) */
+ 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; /* XENKBD_TYPE_KEY */
- uint8_t pressed; /* 1 if pressed; 0 otherwise */
- uint32_t keycode; /* KEY_* from linux/input.h */
+ 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; /* XENKBD_TYPE_POS */
- int32_t abs_x; /* absolute X position (in FB pixels) */
- int32_t abs_y; /* absolute Y position (in FB pixels) */
- int32_t rel_z; /* relative Z motion (wheel) */
+ 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.txt
+ * [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
@@ -72,15 +461,26 @@ union xenkbd_in_event {
struct xenkbd_motion motion;
struct xenkbd_key key;
struct xenkbd_position pos;
+ struct xenkbd_mtouch mtouch;
char pad[XENKBD_IN_EVENT_SIZE];
};
-/* Out events (frontend -> backend) */
-
/*
+ *****************************************************************************
+ * 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
@@ -90,7 +490,11 @@ union xenkbd_out_event {
char pad[XENKBD_OUT_EVENT_SIZE];
};
-/* shared page */
+/*
+ *****************************************************************************
+ * Shared page
+ *****************************************************************************
+ */
#define XENKBD_IN_RING_SIZE 2048
#define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
@@ -113,4 +517,4 @@ struct xenkbd_page {
uint32_t out_cons, out_prod;
};
-#endif
+#endif /* __XEN_PUBLIC_IO_KBDIF_H__ */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.