root/branches/dev/libcwiid/interface.c

/* Copyright (C) 2007 L. Donnie Smith <cwiid@abstrakraft.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  ChangeLog:
 *  2007-05-14 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * added timestamp to cwiid_get_mesg
 *  * added cwiid_get_acc_cal
 *
 *  2007-04-24 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * created for API overhaul
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include "cwiid_internal.h"

int cwiid_get_id(struct wiimote *wiimote)
{
        return wiimote->id;
}

int cwiid_set_data(struct wiimote *wiimote, const void *data)
{
        wiimote->data = data;
        return 0;
}

const void *cwiid_get_data(struct wiimote *wiimote)
{
        return wiimote->data;
}

int cwiid_enable(struct wiimote *wiimote, int flags)
{
        if ((flags & CWIID_FLAG_NONBLOCK) &&
          !(wiimote->flags & CWIID_FLAG_NONBLOCK)) {
                if (fcntl(wiimote->mesg_pipe[0], F_SETFL, O_NONBLOCK)) {
                        cwiid_err(wiimote, "File control error (mesg pipe)");
                        return -1;
                }
        }
        wiimote->flags |= flags;
        return 0;
}

int cwiid_disable(struct wiimote *wiimote, int flags)
{
        if ((flags & CWIID_FLAG_NONBLOCK) &&
          (wiimote->flags & CWIID_FLAG_NONBLOCK)) {
                if (fcntl(wiimote->mesg_pipe[0], F_SETFL, 0)) {
                        cwiid_err(wiimote, "File control error (mesg pipe)");
                        return -1;
                }
        }
        wiimote->flags &= ~flags;
        return 0;
}

int cwiid_set_mesg_callback(struct wiimote *wiimote,
                            cwiid_mesg_callback_t *callback)
{
        if (wiimote->mesg_callback) {
                if (cancel_mesg_callback(wiimote)) {
                        /* prints it's own errors */
                        return -1;
                }
        }

        wiimote->mesg_callback = callback;

        if (wiimote->mesg_callback) {
                if (pthread_create(&wiimote->mesg_callback_thread, NULL,
                                  (void *(*)(void *))&mesg_callback_thread, wiimote)) {
                        cwiid_err(wiimote, "Thread creation error (callback thread)");
                        return -1;
                }
        }

        return 0;
}

int cwiid_get_mesg(struct wiimote *wiimote, int *mesg_count,
                   union cwiid_mesg *mesg[], struct timespec *timestamp)
{
        struct mesg_array ma;

        if (read_mesg_array(wiimote->mesg_pipe[0], &ma)) {
                if (errno == EAGAIN) {
                        return -1;
                }
                else {
                        cwiid_err(wiimote, "Pipe read error (mesg_pipe)");
                        return -1;
                }
        }

        *mesg_count = ma.count;
        *timestamp = ma.timestamp;

        if ((*mesg = malloc(ma.count * sizeof ma.array[0])) == NULL) {
                cwiid_err(wiimote, "Memory allocation error (mesg array)");
                return -1;
        }

        memcpy(*mesg, &ma.array, ma.count * sizeof (*mesg)[0]);

        return 0;
}

int cwiid_get_state(struct wiimote *wiimote, struct cwiid_state *state)
{
        if (pthread_mutex_lock(&wiimote->state_mutex)) {
                cwiid_err(wiimote, "Mutex lock error (state mutex)");
                return -1;
        }

        memcpy(state, &wiimote->state, sizeof *state);

        if (pthread_mutex_unlock(&wiimote->state_mutex)) {
                cwiid_err(wiimote, "Mutex unlock error (state mutex) - "
                                   "deadlock warning");
                return -1;
        }

        return 0;
}

int cwiid_get_acc_cal(struct wiimote *wiimote, enum cwiid_ext_type ext_type,
                      struct acc_cal *acc_cal)
{
        uint8_t flags;
        uint32_t offset;
        unsigned char buf[7];
        char *err_str;

        switch (ext_type) {
        case CWIID_EXT_NONE:
                flags = CWIID_RW_EEPROM;
                offset = 0x16;
                err_str = "";
                break;
        case CWIID_EXT_NUNCHUK:
                flags = CWIID_RW_REG | CWIID_RW_DECODE;
                offset = 0xA40020;
                err_str = "nunchuk ";
                break;
        default:
                cwiid_err(wiimote, "Unsupported calibration request");
                return -1;
        }
        if (cwiid_read(wiimote, flags, offset, 7, buf)) {
                cwiid_err(wiimote, "Read error (%scal)", err_str);
                return -1;
        }

        acc_cal->zero[CWIID_X] = buf[0];
        acc_cal->zero[CWIID_Y] = buf[1];
        acc_cal->zero[CWIID_Z] = buf[2];
        acc_cal->one[CWIID_X]  = buf[4];
        acc_cal->one[CWIID_Y]  = buf[5];
        acc_cal->one[CWIID_Z]  = buf[6];

        return 0;
}