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Date: Fri, 14 Jan 2011 13:02:35 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: [Qemu-devel] paravirtual tablet v2
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To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, spice-devel <spice-devel@lists.freedesktop.org>

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   Hi,

Updated according to the feedback.  Multitouch not added (yet).

cheers,
   Gerd

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 filename="pvtablet.h"

#ifndef __QEMU_PVTABLET__
#define __QEMU_PVTABLET__ 1

/*
 * qemu patavirtual tablet interface
 */

#include <inttypes.h>

/*
 * our virtio-serial channel name(s)
 */
#define QEMU_PVTABLET_FORMAT "org.qemu.pvtablet.%d"

enum qemu_pvtablet_type {
    QEMU_PVTABLET_MSG_INIT,
    QEMU_PVTABLET_MSG_ACK,
    QEMU_PVTABLET_MSG_MOVE,
    QEMU_PVTABLET_MSG_BTN_DOWN,
    QEMU_PVTABLET_MSG_BTN_UP,
};

typedef enum qemu_pvtablet_features {
    /* None yet */
};

typedef enum qemu_pvtablet_buttons {
    QEMU_PVTABLET_BTN_LEFT,
    QEMU_PVTABLET_BTN_RIGHT,
    QEMU_PVTABLET_BTN_MIDDLE,
    QEMU_PVTABLET_BTN_SCROLL_UP,
    QEMU_PVTABLET_BTN_SCROLL_DOWN,
    /*
     * we can handle up to 32 buttons although
     * not every has a individual name ;)
     */
};

/*
 * QEMU_PVTABLET_MSG_INIT, host -> guest
 * first message, sent before any other event
 */
typedef struct qemu_pvtablet_init {
    uint32_t res_x;        /* x axis resolution */
    uint32_t res_y;        /* y axis resolution */
    uint32_t features;     /* qemu_pvtablet_features */
    uint32_t buttons_mask; /* mouse buttons available */
} qemu_pvtablet_init;

/*
 * QEMU_PVTABLET_MSG_ACK, guest -> host
 * sent after pvtablet_init.  host will not send
 * additional messages until this is received
 */
typedef struct qemu_pvtablet_ack {
    uint32_t features; /* qemu_pvtable_features */
};

/*
 * QEMU_PVTABLET_MSG_BTN_{DOWN,UP}, host -> guest
 * send button press+release events
 */
typedef struct qemu_pvtablet_button {
    uint32_t button;
    uint32_t mask;
} qemu_pvtablet_button;

/*
 * QEMU_PVTABLET_MSG_MOVE, host -> guest
 * send pointer move events
 */
typedef struct qemu_pvtablet_position {
    uint32_t pos_x;
    uint32_t pos_y;
} qemu_pvtablet_position;


typedef struct qemu_pvtablet_header {
    uint32_t size;            /* whole message size */
    uint32_t type;            /* qemu_pvtablet_type */
    /*
     * Timestamp is specified in nanoseconds.  Timebase is undefined.
     * This is supposed to be used to figure how much time passed
     * between two events, to decide whenever two mouse clicks should
     * be interpreted as double click or not and simliar stuff.
     */
    uint64_t timestamp;
} qemu_pvtablet_header;

typedef union qemu_pvtablet_payload {
    qemu_pvtablet_init     init;
    qemu_pvtablet_ack      ack;
    qemu_pvtablet_position position;
    qemu_pvtablet_button   button;
};

typedef struct qemu_pvtablet_message {
    qemu_pvtablet_header  hdr;
    qemu_pvtablet_payload data;
} qemu_pvtablet_message;

#endif /* __QEMU_PVTABLET__ */

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