adb_mouse.c

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/*
 * Copyright (c) 2010 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <ipc/mouse.h>
#include <stdio.h>
#include <stdlib.h>
#include <async.h>
#include <errno.h>
#include <devmap.h>

#include "adb_mouse.h"
#include "adb_dev.h"

static void client_connection(ipc_callid_t iid, ipc_call_t *icall);
static void mouse_ev_btn(int button, int press);
static void mouse_ev_move(int dx, int dy);

static int client_phone = -1;
static bool b1_pressed, b2_pressed;

int main(int argc, char **argv)
{
        printf(NAME ": Chardev mouse driver\n");

        /* Initialize device. */
        if (adb_dev_init() != 0)
                return -1;

        b1_pressed = false;
        b2_pressed = false; 

        /* Register driver */
        int rc = devmap_driver_register(NAME, client_connection);
        if (rc < 0) {
                printf(NAME ": Unable to register driver (%d)\n", rc);
                return -1;
        }

        char dev_path[DEVMAP_NAME_MAXLEN + 1];
        snprintf(dev_path, DEVMAP_NAME_MAXLEN, "%s/mouse", NAMESPACE);

        devmap_handle_t devmap_handle;
        if (devmap_device_register(dev_path, &devmap_handle) != EOK) {
                printf(NAME ": Unable to register device %s\n", dev_path);
                return -1;
        }

        printf(NAME ": Accepting connections\n");
        task_retval(0);
        async_manager();

        /* Not reached. */
        return 0;
}

static void client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;
        int retval;

        async_answer_0(iid, EOK);

        while (1) {
                callid = async_get_call(&call);
                switch (IPC_GET_IMETHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        if (client_phone != -1) {
                                async_hangup(client_phone);
                                client_phone = -1;
                        }

                        async_answer_0(callid, EOK);
                        return;
                case IPC_M_CONNECT_TO_ME:
                        if (client_phone != -1) {
                                retval = ELIMIT;
                                break;
                        }
                        client_phone = IPC_GET_ARG5(call);
                        retval = 0;
                        break;
                default:
                        retval = EINVAL;
                }
                async_answer_0(callid, retval);
        }
}

void mouse_handle_data(uint16_t data)
{
        bool b1, b2;
        uint16_t udx, udy;
        int dx, dy;

        /* Extract fields. */
        b1 = ((data >> 15) & 1) == 0;
        udy = (data >> 8) & 0x7f;
        b2 = ((data >> 7) & 1) == 0;
        udx = data & 0x7f;

        /* Decode 7-bit two's complement signed values. */
        dx = (udx & 0x40) ? (udx - 0x80) : udx;
        dy = (udy & 0x40) ? (udy - 0x80) : udy;

        if (b1 != b1_pressed) {
                mouse_ev_btn(1, b1);
                b1_pressed = b1;
        }

        if (b2 != b2_pressed) {
                mouse_ev_btn(2, b2);
                b1_pressed = b1;
        }

        if (dx != 0 || dy != 0)
                mouse_ev_move(dx, dy);
}

static void mouse_ev_btn(int button, int press)
{
        if (client_phone != -1) {
                async_msg_2(client_phone, MEVENT_BUTTON, button, press);
        }
}

static void mouse_ev_move(int dx, int dy)
{
        if (client_phone != -1)
                async_msg_2(client_phone, MEVENT_MOVE, dx, dy);
}

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