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/*****************************************************************************
*
* mtdev - Multitouch Protocol Translation Library (MIT license)
*
* Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
* Copyright (C) 2010 Canonical Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
****************************************************************************/
#include "common.h"
#define SETABS(c, x, map, key, fd) \
(c->has_##x = getbit(map, key) && getabs(&c->x, key, fd))
static const int SN_COORD = 250; /* coordinate signal-to-noise ratio */
static const int SN_WIDTH = 100; /* width signal-to-noise ratio */
static const int SN_ORIENT = 10; /* orientation signal-to-noise ratio */
static const int bits_per_long = 8 * sizeof(long);
static inline int nlongs(int nbit)
{
return (nbit + bits_per_long - 1) / bits_per_long;
}
static inline int getbit(const unsigned long *map, int key)
{
return (map[key / bits_per_long] >> (key % bits_per_long)) & 0x01;
}
static int getabs(struct input_absinfo *abs, int key, int fd)
{
int rc;
SYSCALL(rc = ioctl(fd, EVIOCGABS(key), abs));
return rc >= 0;
}
static int has_mt_data(const struct mtdev_caps *cap)
{
return cap->has_abs[MTDEV_POSITION_X] && cap->has_abs[MTDEV_POSITION_Y];
}
static void default_fuzz(struct mtdev_caps *cap, int bit, int sn)
{
if (cap->has_abs[bit] && cap->abs[bit].fuzz == 0)
cap->abs[bit].fuzz =
(cap->abs[bit].maximum - cap->abs[bit].minimum) / sn;
}
static int read_caps(struct mtdev_caps *cap, int fd)
{
unsigned long absbits[nlongs(ABS_MAX)];
int rc, i;
memset(cap, 0, sizeof(struct mtdev_caps));
SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits));
if (rc < 0)
return rc;
SETABS(cap, slot, absbits, ABS_MT_SLOT, fd);
for (i = 0; i < MT_ABS_SIZE; i++)
SETABS(cap, abs[i], absbits, mtdev_mt2abs(i), fd);
cap->has_mtdata = has_mt_data(cap);
if (!cap->has_abs[MTDEV_POSITION_X])
getabs(&cap->abs[MTDEV_POSITION_X], ABS_X, fd);
if (!cap->has_abs[MTDEV_POSITION_Y])
getabs(&cap->abs[MTDEV_POSITION_Y], ABS_Y, fd);
if (!cap->has_abs[MTDEV_PRESSURE])
getabs(&cap->abs[MTDEV_PRESSURE], ABS_PRESSURE, fd);
if (!cap->has_abs[MTDEV_TRACKING_ID]) {
cap->abs[MTDEV_TRACKING_ID].minimum = MT_ID_MIN;
cap->abs[MTDEV_TRACKING_ID].maximum = MT_ID_MAX;
}
default_fuzz(cap, MTDEV_POSITION_X, SN_COORD);
default_fuzz(cap, MTDEV_POSITION_Y, SN_COORD);
default_fuzz(cap, MTDEV_TOUCH_MAJOR, SN_WIDTH);
default_fuzz(cap, MTDEV_TOUCH_MINOR, SN_WIDTH);
default_fuzz(cap, MTDEV_WIDTH_MAJOR, SN_WIDTH);
default_fuzz(cap, MTDEV_WIDTH_MINOR, SN_WIDTH);
default_fuzz(cap, MTDEV_ORIENTATION, SN_ORIENT);
return 0;
}
int mtdev_configure(struct mtdev *dev, int fd)
{
return read_caps(&dev->caps, fd);
}
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