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/***************************************************************************
*
* Multitouch protocol X driver
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
* Copyright (C) 2009,2010 Nokia Corporation
*
* Adaptation to libmtdev and Linux multi-touch-protocol B (slotted)
* Copyright (C) 2010 Intel Corporation
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
**************************************************************************/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <xf86.h>
#include "mtouch.h"
int mtouch_configure(struct mtev_mtouch *mt, int fd)
{
int rc = caps_read(&mt->caps, fd);
if (rc < 0)
return rc;
caps_output(&mt->caps);
return 0;
}
int mtouch_open(struct mtev_mtouch *mt, int fd)
{
memset(&mt->ev, 0, sizeof(mt->ev));
memset(&mt->dev, 0, sizeof(mt->dev));
mt->num_events = 0;
hw_init(&mt->hw_state);
return mtdev_open(&mt->dev, fd);
}
int mtouch_close(struct mtev_mtouch *mt, int fd)
{
mtdev_close(&mt->dev);
memset(&mt->dev, 0, sizeof(mt->dev));
memset(&mt->ev, 0, sizeof(mt->ev));
mt->num_events = 0;
hw_init(&mt->hw_state);
return 0;
}
const struct input_event* mtouch_read_event(struct mtev_mtouch *mt, int fd)
{
struct input_event *ev;
/* Read in bursts from input subsystem, then feed to caller one
* at a time, only reading the next burst when the queue is empty */
if (mt->num_events_read >= mt->num_events) {
int n;
SYSCALL(n = mtdev_get(&mt->dev, fd, mt->ev, MAX_EVENTS));
if (n <= 0)
return NULL;
mt->num_events = n;
mt->num_events_read = 0;
}
if (mt->num_events > mt->num_events_read) {
ev = &mt->ev[mt->num_events_read];
mt->num_events_read++;
return ev;
}
// This should not happen
xf86Msg(X_ERROR, "mtev: got read_event without event!\n");
return NULL;
}
bool mtouch_read_synchronized_event(struct mtev_mtouch *mt, int fd)
{
const struct input_event* ev;
while ((ev = mtouch_read_event(mt, fd))) {
if (hw_read(&mt->hw_state, ev))
return 1;
}
return 0;
}
const struct mtev_touch_point* mtouch_get_contact(const struct mtev_mtouch *mt, int n)
{
int i = 0;
do {
if (mt->hw_state.slot[i].tracking_id != INVALID_TRACKING_ID && (n--) == 0)
return &mt->hw_state.slot[i];
} while (++i < HW_MAX_SLOTS);
return NULL;
}
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