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/***************************************************************************
*
* Multitouch X driver
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
*
* 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 "capabilities.h"
#define SETABS(c, x, map, key, fd) \
(c->has_##x = getbit(map, key) && getabs(&c->x, key, fd))
#define ADDCAP(s, c, x) strcat(s, c->has_##x ? " " #x : "")
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 Capabilities *cap)
{
return cap->has_abs[MTDEV_POSITION_X] && cap->has_abs[MTDEV_POSITION_Y];
}
static int has_integrated_button(const struct Capabilities *cap)
{
static const int bcm5974_vmask_ibt = 1;
if (strcmp(cap->devname, "bcm5974"))
return 0;
return cap->devid.version & bcm5974_vmask_ibt;
}
static void default_fuzz(struct Capabilities *cap, unsigned int code, int sn)
{
int bit = mtdev_abs2mt(code);
if (cap->has_abs[bit] && cap->abs[bit].fuzz == 0)
cap->abs[bit].fuzz =
(cap->abs[bit].maximum - cap->abs[bit].minimum) / sn;
}
int read_capabilities(struct Capabilities *cap, int fd)
{
unsigned long evbits[nlongs(EV_MAX)];
unsigned long absbits[nlongs(ABS_MAX)];
unsigned long keybits[nlongs(KEY_MAX)];
int rc, i;
memset(cap, 0, sizeof(struct Capabilities));
SYSCALL(rc = ioctl(fd, EVIOCGID, &cap->devid));
if (rc < 0)
return rc;
SYSCALL(rc = ioctl(fd, EVIOCGNAME(sizeof(cap->devname)), cap->devname));
if (rc < 0)
return rc;
SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_SYN, sizeof(evbits)), evbits));
if (rc < 0)
return rc;
SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits));
if (rc < 0)
return rc;
SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits));
if (rc < 0)
return rc;
cap->has_left = getbit(keybits, BTN_LEFT);
cap->has_middle = getbit(keybits, BTN_MIDDLE);
cap->has_right = getbit(keybits, BTN_RIGHT);
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);
cap->has_ibt = has_integrated_button(cap);
default_fuzz(cap, ABS_MT_POSITION_X, SN_COORD);
default_fuzz(cap, ABS_MT_POSITION_Y, SN_COORD);
default_fuzz(cap, ABS_MT_TOUCH_MAJOR, SN_WIDTH);
default_fuzz(cap, ABS_MT_TOUCH_MINOR, SN_WIDTH);
default_fuzz(cap, ABS_MT_WIDTH_MAJOR, SN_WIDTH);
default_fuzz(cap, ABS_MT_WIDTH_MINOR, SN_WIDTH);
default_fuzz(cap, ABS_MT_ORIENTATION, SN_ORIENT);
return 0;
}
int get_cap_xsize(const struct Capabilities *cap)
{
const struct input_absinfo *x = &cap->abs[MTDEV_POSITION_X];
return x->maximum - x->minimum;
}
int get_cap_ysize(const struct Capabilities *cap)
{
const struct input_absinfo *y = &cap->abs[MTDEV_POSITION_Y];
return y->maximum - y->minimum;
}
int get_cap_wsize(const struct Capabilities *cap)
{
const struct input_absinfo *w = &cap->abs[MTDEV_TOUCH_MAJOR];
return w->maximum - w->minimum;
}
int get_cap_xmid(const struct Capabilities *cap)
{
const struct input_absinfo *x = &cap->abs[MTDEV_POSITION_X];
return (x->maximum + x->minimum) >> 1;
}
int get_cap_ymid(const struct Capabilities *cap)
{
const struct input_absinfo *y = &cap->abs[MTDEV_POSITION_Y];
return (y->maximum + y->minimum) >> 1;
}
void output_capabilities(const struct Capabilities *cap)
{
char line[1024];
int i;
memset(line, 0, sizeof(line));
ADDCAP(line, cap, left);
ADDCAP(line, cap, middle);
ADDCAP(line, cap, right);
ADDCAP(line, cap, mtdata);
ADDCAP(line, cap, ibt);
xf86Msg(X_INFO, "multitouch: devname: %s\n", cap->devname);
xf86Msg(X_INFO, "multitouch: devid: %x %x %x\n",
cap->devid.vendor, cap->devid.product, cap->devid.version);
xf86Msg(X_INFO, "multitouch: caps:%s\n", line);
for (i = 0; i < MT_ABS_SIZE; i++) {
if (cap->has_abs[i])
xf86Msg(X_INFO, "multitouch: %d: min: %d max: %d\n",
i,
cap->abs[i].minimum,
cap->abs[i].maximum);
}
}
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