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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.
*
****************************************************************************/
#ifndef COMMON_H
#define COMMON_H
#define MTDEV_NO_LEGACY_API
#include <mtdev-mapping.h>
#include <mtdev-plumbing.h>
#include <malloc.h>
#include <string.h>
#include <errno.h>
#define DIM_FINGER 32
#define DIM2_FINGER (DIM_FINGER * DIM_FINGER)
/* event buffer size (must be a power of two) */
#define DIM_EVENTS 512
/* all bit masks have this type */
typedef unsigned int bitmask_t;
#define BITMASK(x) (1U << (x))
#define BITONES(x) (BITMASK(x) - 1U)
#define GETBIT(m, x) (((m) >> (x)) & 1U)
#define SETBIT(m, x) (m |= BITMASK(x))
#define CLEARBIT(m, x) (m &= ~BITMASK(x))
#define MODBIT(m, x, b) ((b) ? SETBIT(m, x) : CLEARBIT(m, x))
static inline int maxval(int x, int y) { return x > y ? x : y; }
static inline int minval(int x, int y) { return x < y ? x : y; }
static inline int clamp15(int x)
{
return x < -32767 ? -32767 : x > 32767 ? 32767 : x;
}
/* absolute scale is assumed to fit in 15 bits */
static inline int dist2(int dx, int dy)
{
dx = clamp15(dx);
dy = clamp15(dy);
return dx * dx + dy * dy;
}
/* Count number of bits (Sean Eron Andersson's Bit Hacks) */
static inline int bitcount(unsigned v)
{
v -= ((v>>1) & 0x55555555);
v = (v&0x33333333) + ((v>>2) & 0x33333333);
return (((v + (v>>4)) & 0xF0F0F0F) * 0x1010101) >> 24;
}
/* Return index of first bit [0-31], -1 on zero */
#define firstbit(v) (__builtin_ffs(v) - 1)
/* boost-style foreach bit */
#define foreach_bit(i, m) \
for (i = firstbit(m); i >= 0; i = firstbit((m) & (~0U << (i + 1))))
/* robust system ioctl calls */
#define SYSCALL(call) while (((call) == -1) && (errno == EINTR))
/**
* struct mtdev - represents an input MT device
* @has_mtdata: true if the device has MT capabilities
* @has_slot: true if the device sends MT slots
* @slot: slot event properties
* @abs: ABS_MT event properties
* @state: internal mtdev parsing state
*
* The mtdev structure represents a kernel MT device type B, emitting
* MT slot events. The events put into mtdev may be from any MT
* device, specifically type A without contact tracking, type A with
* contact tracking, or type B with contact tracking. See the kernel
* documentation for further details.
*
*/
struct mtdev {
int has_mtdata;
int has_slot;
int has_abs[11];
struct input_absinfo slot;
struct input_absinfo abs[11];
struct mtdev_state *state;
};
#define MT_ABS_SIZE 12
static const unsigned int mtdev_map_abs2mt[ABS_CNT] = {
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008,
0x0009, 0x000a, 0x000b, 0x000c, 0x0000, 0x0000, 0x0000, 0x0000,
};
static const unsigned int mtdev_map_mt2abs[MT_ABS_SIZE] = {
0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
0x0038, 0x0039, 0x003a, 0x003b,
};
static inline int mtdev_is_absmt(unsigned int code)
{
return mtdev_map_abs2mt[code];
}
static inline unsigned int mtdev_abs2mt(unsigned int code)
{
return mtdev_map_abs2mt[code] - 1;
}
static inline unsigned int mtdev_mt2abs(unsigned int mtcode)
{
return mtdev_map_mt2abs[mtcode];
}
#endif
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