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SDL_sysjoystick.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
/* This is the system specific header for the SDL joystick API */
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <limits.h> /* For the definition of PATH_MAX */
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#ifdef __arm__
#include <linux/limits.h> /* Arm cross-compiler needs this */
#endif
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#include <linux/joystick.h>
#ifdef USE_INPUT_EVENTS
#include <linux/input.h>
#endif
#include "SDL_joystick.h"
#include "SDL_sysjoystick.h"
#include "SDL_joystick_c.h"
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/* Special joystick configurations */
static struct {
const char *name;
int naxes;
int nhats;
int nballs;
} special_joysticks[] = {
{ "MadCatz Panther XL", 3, 2, 1 }, /* We don't handle rudder (axis 8) */
{ "SideWinder Precision Pro", 4, 1, 0 },
{ "SideWinder 3D Pro", 4, 1, 0 },
{ "Microsoft SideWinder 3D Pro", 4, 1, 0 },
{ "Microsoft SideWinder Dual Strike USB version 1.0", 2, 1, 0 },
{ "WingMan Interceptor", 3, 3, 0 },
{ "WingMan Extreme Digital 3D", 4, 1, 0 },
{ "Microsoft SideWinder Precision 2 Joystick", 4, 1, 0 },
{ "Logitech Inc. WingMan Extreme Digital 3D", 4, 1, 0 },
{ "Saitek Saitek X45", 6, 1, 0 }
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};
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#ifndef NO_LOGICAL_JOYSTICKS
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static struct joystick_logical_values {
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int njoy;
int nthing;
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} joystick_logical_values[] = {
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/* +0 */
/* MP-8800 axes map - map to {logical joystick #, logical axis #} */
{0,0},{0,1},{0,2},{1,0},{1,1},{0,3},{1,2},{1,3},{2,0},{2,1},{2,2},{2,3},
{3,0},{3,1},{3,2},{3,3},{0,4},{1,4},{2,4},
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/* +19 */
/* MP-8800 hat map - map to {logical joystick #, logical hat #} */
{0,0},{1,0},{2,0},{3,0},
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/* +23 */
/* MP-8800 button map - map to {logical joystick #, logical button #} */
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{0,0},{0,1},{0,2},{0,3},{0,4},{0,5},{0,6},{0,7},{0,8},{0,9},{0,10},{0,11},
{1,0},{1,1},{1,2},{1,3},{1,4},{1,5},{1,6},{1,7},{1,8},{1,9},{1,10},{1,11},
{2,0},{2,1},{2,2},{2,3},{2,4},{2,5},{2,6},{2,7},{2,8},{2,9},{2,10},{2,11},
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{3,0},{3,1},{3,2},{3,3},{3,4},{3,5},{3,6},{3,7},{3,8},{3,9},{3,10},{3,11}
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};
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static struct joystick_logical_layout {
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int naxes;
int nhats;
int nballs;
int nbuttons;
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} joystick_logical_layout[] = {
/* MP-8800 logical layout */
{5, 1, 0, 12},
{5, 1, 0, 12},
{5, 1, 0, 12},
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{4, 1, 0, 12}
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};
/*
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Some USB HIDs show up as a single joystick even though they actually
control 2 or more joysticks. This array sets up a means of mapping
a single physical joystick to multiple logical joysticks. (djm)
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njoys
the number of logical joysticks
layouts
an array of layout structures, one to describe each logical joystick
axes, hats, balls, buttons
arrays that map a physical thingy to a logical thingy
*/
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static struct joystick_logicalmap {
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const char *name;
int njoys;
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struct joystick_logical_layout *layouts;
struct joystick_logical_values *axes;
struct joystick_logical_values *hats;
struct joystick_logical_values *balls;
struct joystick_logical_values *buttons;
} joystick_logicalmap[] = {
{"WiseGroup.,Ltd MP-8800 Quad USB Joypad", 4, joystick_logical_layout,
joystick_logical_values, joystick_logical_values+19, NULL,
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joystick_logical_values+23}
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};
/* find the head of a linked list, given a point in it
*/
#define SDL_joylist_head(i, start)\
for(i = start; SDL_joylist[i].fname == NULL;) i = SDL_joylist[i].prev;
#define SDL_logical_joydecl(d) d
#else
#define SDL_logical_joydecl(d)
#endif /* USE_LOGICAL_JOYSTICKS */
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/* The maximum number of joysticks we'll detect */
#define MAX_JOYSTICKS 32
/* A list of available joysticks */
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static struct
{
char* fname;
#ifndef NO_LOGICAL_JOYSTICKS
SDL_Joystick* joy;
struct joystick_logicalmap* map;
int prev;
int next;
int logicalno;
#endif /* USE_LOGICAL_JOYSTICKS */
} SDL_joylist[MAX_JOYSTICKS];
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/* The private structure used to keep track of a joystick */
struct joystick_hwdata {
int fd;
/* The current linux joystick driver maps hats to two axes */
struct hwdata_hat {
int axis[2];
} *hats;
/* The current linux joystick driver maps balls to two axes */
struct hwdata_ball {
int axis[2];
} *balls;
/* Support for the Linux 2.4 unified input interface */
#ifdef USE_INPUT_EVENTS
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SDL_bool is_hid;
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Uint8 key_map[KEY_MAX-BTN_MISC];
Uint8 abs_map[ABS_MAX];
struct axis_correct {
int used;
int coef[3];
} abs_correct[ABS_MAX];
#endif
};
static char *mystrdup(const char *string)
{
char *newstring;
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newstring = (char *)SDL_malloc(SDL_strlen(string)+1);
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if ( newstring ) {
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SDL_strcpy(newstring, string);
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}
return(newstring);
}
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#ifndef NO_LOGICAL_JOYSTICKS
static int CountLogicalJoysticks(int max)
{
register int i, j, k, ret, prev;
const char* name;
ret = 0;
for(i = 0; i < max; i++) {
name = SDL_SYS_JoystickName(i);
if (name) {
for(j = 0; j < SDL_TABLESIZE(joystick_logicalmap); j++) {
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if (!SDL_strcmp(name, joystick_logicalmap[j].name)) {
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prev = i;
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SDL_joylist[prev].map = joystick_logicalmap+j;
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for(k = 1; k < joystick_logicalmap[j].njoys; k++) {
SDL_joylist[prev].next = max + ret;
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if (prev != i)
SDL_joylist[max+ret].prev = prev;
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prev = max + ret;
SDL_joylist[prev].logicalno = k;
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SDL_joylist[prev].map = joystick_logicalmap+j;
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ret++;
}
break;
}
}
}
}
return ret;
}
static void LogicalSuffix(int logicalno, char* namebuf, int len)
{
register int slen;
const static char suffixs[] =
"01020304050607080910111213141516171819"
"20212223242526272829303132";
const char* suffix;
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slen = SDL_strlen(namebuf);
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suffix = NULL;
if (logicalno*2<sizeof(suffixs))
suffix = suffixs + (logicalno*2);
if (slen + 4 < len && suffix) {
namebuf[slen++] = ' ';
namebuf[slen++] = '#';
namebuf[slen++] = suffix[0];
namebuf[slen++] = suffix[1];
namebuf[slen++] = 0;
}
}
#endif /* USE_LOGICAL_JOYSTICKS */
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#ifdef USE_INPUT_EVENTS
#define test_bit(nr, addr) \
(((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0)
static int EV_IsJoystick(int fd)
{
unsigned long evbit[40];
unsigned long keybit[40];
unsigned long absbit[40];
if ( (ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||
(ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0) ) {
return(0);
}
if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) &&
test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit) &&
(test_bit(BTN_TRIGGER, keybit) || test_bit(BTN_A, keybit) || test_bit(BTN_1, keybit)))) return 0;
return(1);
}
#endif /* USE_INPUT_EVENTS */
/* Function to scan the system for joysticks */
int SDL_SYS_JoystickInit(void)
{
/* The base path of the joystick devices */
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const char *joydev_pattern[] = {
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#ifdef USE_INPUT_EVENTS
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"/dev/input/event%d",
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#endif
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"/dev/input/js%d",
"/dev/js%d"
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};
int numjoysticks;
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int i, j;
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int fd;
char path[PATH_MAX];
dev_t dev_nums[MAX_JOYSTICKS]; /* major/minor device numbers */
struct stat sb;
int n, duplicate;
numjoysticks = 0;
/* First see if the user specified a joystick to use */
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if ( SDL_getenv("SDL_JOYSTICK_DEVICE") != NULL ) {
SDL_strncpy(path, SDL_getenv("SDL_JOYSTICK_DEVICE"), sizeof(path));
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path[sizeof(path)-1] = '\0';
if ( stat(path, &sb) == 0 ) {
fd = open(path, O_RDONLY, 0);
if ( fd >= 0 ) {
/* Assume the user knows what they're doing. */
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SDL_joylist[numjoysticks].fname =mystrdup(path);
if ( SDL_joylist[numjoysticks].fname ) {
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dev_nums[numjoysticks] = sb.st_rdev;
++numjoysticks;
}
close(fd);
}
}
}
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for ( i=0; i<SDL_TABLESIZE(joydev_pattern); ++i ) {
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for ( j=0; j < MAX_JOYSTICKS; ++j ) {
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SDL_snprintf(path, SDL_arraysize(path), joydev_pattern[i], j);
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/* rcg06302000 replaced access(F_OK) call with stat().
* stat() will fail if the file doesn't exist, so it's
* equivalent behaviour.
*/
if ( stat(path, &sb) == 0 ) {
/* Check to make sure it's not already in list.
* This happens when we see a stick via symlink.
*/
duplicate = 0;
for (n=0; (n<numjoysticks) && !duplicate; ++n) {
if ( sb.st_rdev == dev_nums[n] ) {
duplicate = 1;
}
}
if (duplicate) {
continue;
}
fd = open(path, O_RDONLY, 0);
if ( fd < 0 ) {
continue;
}
#ifdef USE_INPUT_EVENTS
#ifdef DEBUG_INPUT_EVENTS
printf("Checking %s\n", path);
#endif
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if ( (i == 0) && ! EV_IsJoystick(fd) ) {
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close(fd);
continue;
}
#endif
close(fd);
/* We're fine, add this joystick */
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SDL_joylist[numjoysticks].fname =mystrdup(path);
if ( SDL_joylist[numjoysticks].fname ) {
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dev_nums[numjoysticks] = sb.st_rdev;
++numjoysticks;
}
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} else
break;
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}
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#ifdef USE_INPUT_EVENTS
/* This is a special case...
If the event devices are valid then the joystick devices
will be duplicates but without extra information about their
hats or balls. Unfortunately, the event devices can't
currently be calibrated, so it's a win-lose situation.
So : /dev/input/eventX = /dev/input/jsY = /dev/jsY
*/
if ( (i == 0) && (numjoysticks > 0) )
break;
#endif
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}
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#ifndef NO_LOGICAL_JOYSTICKS
numjoysticks += CountLogicalJoysticks(numjoysticks);
#endif
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return(numjoysticks);
}
/* Function to get the device-dependent name of a joystick */
const char *SDL_SYS_JoystickName(int index)
{
int fd;
static char namebuf[128];
char *name;
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SDL_logical_joydecl(int oindex = index);
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#ifndef NO_LOGICAL_JOYSTICKS
SDL_joylist_head(index, index);
#endif
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name = NULL;
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fd = open(SDL_joylist[index].fname, O_RDONLY, 0);
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if ( fd >= 0 ) {
if (
#ifdef USE_INPUT_EVENTS
(ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) &&
#endif
(ioctl(fd, JSIOCGNAME(sizeof(namebuf)), namebuf) <= 0) ) {
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name = SDL_joylist[index].fname;
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} else {
name = namebuf;
}
close(fd);
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#ifndef NO_LOGICAL_JOYSTICKS
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if (SDL_joylist[oindex].prev || SDL_joylist[oindex].next)
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LogicalSuffix(SDL_joylist[oindex].logicalno, namebuf, 128);
#endif
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}
return name;
}
static int allocate_hatdata(SDL_Joystick *joystick)
{
int i;
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joystick->hwdata->hats = (struct hwdata_hat *)SDL_malloc(
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joystick->nhats * sizeof(struct hwdata_hat));
if ( joystick->hwdata->hats == NULL ) {
return(-1);
}
for ( i=0; i<joystick->nhats; ++i ) {
joystick->hwdata->hats[i].axis[0] = 1;
joystick->hwdata->hats[i].axis[1] = 1;
}
return(0);
}
static int allocate_balldata(SDL_Joystick *joystick)
{
int i;
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joystick->hwdata->balls = (struct hwdata_ball *)SDL_malloc(
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joystick->nballs * sizeof(struct hwdata_ball));
if ( joystick->hwdata->balls == NULL ) {
return(-1);
}
for ( i=0; i<joystick->nballs; ++i ) {
joystick->hwdata->balls[i].axis[0] = 0;
joystick->hwdata->balls[i].axis[1] = 0;
}
return(0);
}
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static SDL_bool JS_ConfigJoystick(SDL_Joystick *joystick, int fd)
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{
SDL_bool handled;
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unsigned char n;
int old_axes, tmp_naxes, tmp_nhats, tmp_nballs;
const char *name;
char *env, env_name[128];
int i;
handled = SDL_FALSE;
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/* Default joystick device settings */
if ( ioctl(fd, JSIOCGAXES, &n) < 0 ) {
joystick->naxes = 2;
} else {
joystick->naxes = n;
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}
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if ( ioctl(fd, JSIOCGBUTTONS, &n) < 0 ) {
joystick->nbuttons = 2;
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} else {
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joystick->nbuttons = n;
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}
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name = SDL_SYS_JoystickName(joystick->index);
old_axes = joystick->naxes;
/* Generic analog joystick support */
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if ( SDL_strstr(name, "Analog") == name && SDL_strstr(name, "-hat") ) {
if ( SDL_sscanf(name,"Analog %d-axis %*d-button %d-hat",
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&tmp_naxes, &tmp_nhats) == 2 ) {
joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
handled = SDL_TRUE;
}
}
/* Special joystick support */
for ( i=0; i < SDL_TABLESIZE(special_joysticks); ++i ) {
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if ( SDL_strcmp(name, special_joysticks[i].name) == 0 ) {
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joystick->naxes = special_joysticks[i].naxes;
joystick->nhats = special_joysticks[i].nhats;
joystick->nballs = special_joysticks[i].nballs;
handled = SDL_TRUE;
break;
}
}
/* User environment joystick support */
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if ( (env = SDL_getenv("SDL_LINUX_JOYSTICK")) ) {
SDL_strcpy(env_name, "");
if ( *env == '\'' && SDL_sscanf(env, "'%[^']s'", env_name) == 1 )
env += SDL_strlen(env_name)+2;
else if ( SDL_sscanf(env, "%s", env_name) == 1 )
env += SDL_strlen(env_name);
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if ( SDL_strcmp(name, env_name) == 0 ) {
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if ( SDL_sscanf(env, "%d %d %d", &tmp_naxes, &tmp_nhats,
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&tmp_nballs) == 3 ) {
joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
joystick->nballs = tmp_nballs;
handled = SDL_TRUE;
}
}
}
/* Remap hats and balls */
if (handled) {
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if ( joystick->nhats > 0 ) {
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if ( allocate_hatdata(joystick) < 0 ) {
joystick->nhats = 0;
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}
}
if ( joystick->nballs > 0 ) {
if ( allocate_balldata(joystick) < 0 ) {
joystick->nballs = 0;
}
}
}
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return(handled);
}
#ifdef USE_INPUT_EVENTS
static SDL_bool EV_ConfigJoystick(SDL_Joystick *joystick, int fd)
{
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int i, t;
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unsigned long keybit[40];
unsigned long absbit[40];
unsigned long relbit[40];
/* See if this device uses the new unified event API */
if ( (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) >= 0) &&
(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) >= 0) &&
(ioctl(fd, EVIOCGBIT(EV_REL, sizeof(relbit)), relbit) >= 0) ) {
joystick->hwdata->is_hid = SDL_TRUE;
/* Get the number of buttons, axes, and other thingamajigs */
for ( i=BTN_JOYSTICK; i < KEY_MAX; ++i ) {
if ( test_bit(i, keybit) ) {
#ifdef DEBUG_INPUT_EVENTS
printf("Joystick has button: 0x%x\n", i);
#endif
joystick->hwdata->key_map[i-BTN_MISC] =
joystick->nbuttons;
++joystick->nbuttons;
}
}
for ( i=BTN_MISC; i < BTN_JOYSTICK; ++i ) {
if ( test_bit(i, keybit) ) {
#ifdef DEBUG_INPUT_EVENTS
printf("Joystick has button: 0x%x\n", i);
#endif
joystick->hwdata->key_map[i-BTN_MISC] =
joystick->nbuttons;
++joystick->nbuttons;
}
}
for ( i=0; i<ABS_MAX; ++i ) {
/* Skip hats */
if ( i == ABS_HAT0X ) {
i = ABS_HAT3Y;
continue;
}
if ( test_bit(i, absbit) ) {
int values[5];
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if ( ioctl(fd, EVIOCGABS(i), values) < 0 )
continue;
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#ifdef DEBUG_INPUT_EVENTS
printf("Joystick has absolute axis: %x\n", i);
printf("Values = { %d, %d, %d, %d, %d }\n",
values[0], values[1],
values[2], values[3], values[4]);
#endif /* DEBUG_INPUT_EVENTS */
joystick->hwdata->abs_map[i] = joystick->naxes;
if ( values[1] == values[2] ) {
joystick->hwdata->abs_correct[i].used = 0;
} else {
joystick->hwdata->abs_correct[i].used = 1;
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joystick->hwdata->abs_correct[i].coef[0] =
(values[2] + values[1]) / 2 - values[4];
joystick->hwdata->abs_correct[i].coef[1] =
(values[2] + values[1]) / 2 + values[4];
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t = ((values[2] - values[1]) / 2 - 2 * values[4]);
if ( t != 0 ) {
joystick->hwdata->abs_correct[i].coef[2] = (1 << 29) / t;
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} else {
joystick->hwdata->abs_correct[i].coef[2] = 0;
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}
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}
++joystick->naxes;
}
}
for ( i=ABS_HAT0X; i <= ABS_HAT3Y; i += 2 ) {
if ( test_bit(i, absbit) || test_bit(i+1, absbit) ) {
#ifdef DEBUG_INPUT_EVENTS
printf("Joystick has hat %d\n",(i-ABS_HAT0X)/2);
#endif
++joystick->nhats;
}
}
if ( test_bit(REL_X, relbit) || test_bit(REL_Y, relbit) ) {
++joystick->nballs;
}
/* Allocate data to keep track of these thingamajigs */
if ( joystick->nhats > 0 ) {
if ( allocate_hatdata(joystick) < 0 ) {
joystick->nhats = 0;
}
}
if ( joystick->nballs > 0 ) {
if ( allocate_balldata(joystick) < 0 ) {
joystick->nballs = 0;
}
}
}
return(joystick->hwdata->is_hid);
}
#endif /* USE_INPUT_EVENTS */
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#ifndef NO_LOGICAL_JOYSTICKS
static void ConfigLogicalJoystick(SDL_Joystick *joystick)
{
struct joystick_logical_layout* layout;
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layout = SDL_joylist[joystick->index].map->layouts +
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SDL_joylist[joystick->index].logicalno;
joystick->nbuttons = layout->nbuttons;
joystick->nhats = layout->nhats;
joystick->naxes = layout->naxes;
joystick->nballs = layout->nballs;
}
#endif
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/* Function to open a joystick for use.
The joystick to open is specified by the index field of the joystick.
This should fill the nbuttons and naxes fields of the joystick structure.
It returns 0, or -1 if there is an error.
*/
int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
{
int fd;
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SDL_logical_joydecl(int realindex);
SDL_logical_joydecl(SDL_Joystick *realjoy = NULL);
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/* Open the joystick and set the joystick file descriptor */
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#ifndef NO_LOGICAL_JOYSTICKS
if (SDL_joylist[joystick->index].fname == NULL) {
SDL_joylist_head(realindex, joystick->index);
realjoy = SDL_JoystickOpen(realindex);
if (realjoy == NULL)
return(-1);
fd = realjoy->hwdata->fd;
} else {
fd = open(SDL_joylist[joystick->index].fname, O_RDONLY, 0);
}
SDL_joylist[joystick->index].joy = joystick;
#else
fd = open(SDL_joylist[joystick->index].fname, O_RDONLY, 0);
#endif
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if ( fd < 0 ) {
SDL_SetError("Unable to open %s\n",
SDL_joylist[joystick->index]);
return(-1);
}
joystick->hwdata = (struct joystick_hwdata *)
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SDL_malloc(sizeof(*joystick->hwdata));
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if ( joystick->hwdata == NULL ) {
SDL_OutOfMemory();
close(fd);
return(-1);
}
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SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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joystick->hwdata->fd = fd;
/* Set the joystick to non-blocking read mode */
fcntl(fd, F_SETFL, O_NONBLOCK);
/* Get the number of buttons and axes on the joystick */
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#ifndef NO_LOGICAL_JOYSTICKS
if (realjoy)
ConfigLogicalJoystick(joystick);
else
#endif
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#ifdef USE_INPUT_EVENTS
if ( ! EV_ConfigJoystick(joystick, fd) )
#endif
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JS_ConfigJoystick(joystick, fd);
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return(0);
}
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#ifndef NO_LOGICAL_JOYSTICKS
static SDL_Joystick* FindLogicalJoystick(
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SDL_Joystick *joystick, struct joystick_logical_values* v)
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{
SDL_Joystick *logicaljoy;
register int i;
i = joystick->index;
logicaljoy = NULL;
/* get the fake joystick that will receive the event
*/
for(;;) {
if (SDL_joylist[i].logicalno == v->njoy) {
logicaljoy = SDL_joylist[i].joy;
break;
}
if (SDL_joylist[i].next == 0)
break;
i = SDL_joylist[i].next;
}
return logicaljoy;
}
static int LogicalJoystickButton(
SDL_Joystick *joystick, Uint8 button, Uint8 state){
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struct joystick_logical_values* buttons;
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SDL_Joystick *logicaljoy = NULL;
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[joystick->index].map == NULL)
return 0;
/* get the logical joystick that will receive the event
*/
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buttons = SDL_joylist[joystick->index].map->buttons+button;
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logicaljoy = FindLogicalJoystick(joystick, buttons);
if (logicaljoy == NULL)
return 1;
SDL_PrivateJoystickButton(logicaljoy, buttons->nthing, state);
return 1;
}
static int LogicalJoystickAxis(
SDL_Joystick *joystick, Uint8 axis, Sint16 value)
{
778
struct joystick_logical_values* axes;
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SDL_Joystick *logicaljoy = NULL;
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[joystick->index].map == NULL)
return 0;
/* get the logical joystick that will receive the event
*/
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axes = SDL_joylist[joystick->index].map->axes+axis;
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logicaljoy = FindLogicalJoystick(joystick, axes);
if (logicaljoy == NULL)
return 1;
SDL_PrivateJoystickAxis(logicaljoy, axes->nthing, value);
return 1;
}
#endif /* USE_LOGICAL_JOYSTICKS */
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static __inline__
void HandleHat(SDL_Joystick *stick, Uint8 hat, int axis, int value)
{
struct hwdata_hat *the_hat;
const Uint8 position_map[3][3] = {
{ SDL_HAT_LEFTUP, SDL_HAT_UP, SDL_HAT_RIGHTUP },
{ SDL_HAT_LEFT, SDL_HAT_CENTERED, SDL_HAT_RIGHT },
{ SDL_HAT_LEFTDOWN, SDL_HAT_DOWN, SDL_HAT_RIGHTDOWN }
};
809
SDL_logical_joydecl(SDL_Joystick *logicaljoy = NULL);
810
SDL_logical_joydecl(struct joystick_logical_values* hats = NULL);
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the_hat = &stick->hwdata->hats[hat];
if ( value < 0 ) {
value = 0;
} else
if ( value == 0 ) {
value = 1;
} else
if ( value > 0 ) {
value = 2;
}
if ( value != the_hat->axis[axis] ) {
the_hat->axis[axis] = value;
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830
831
#ifndef NO_LOGICAL_JOYSTICKS
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[stick->index].map != NULL) {
/* get the fake joystick that will receive the event
*/
832
hats = SDL_joylist[stick->index].map->hats+hat;
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logicaljoy = FindLogicalJoystick(stick, hats);
}
if (logicaljoy) {
stick = logicaljoy;
hat = hats->nthing;
}
#endif /* USE_LOGICAL_JOYSTICKS */
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SDL_PrivateJoystickHat(stick, hat,
position_map[the_hat->axis[1]][the_hat->axis[0]]);
}
}
static __inline__
void HandleBall(SDL_Joystick *stick, Uint8 ball, int axis, int value)
{
stick->hwdata->balls[ball].axis[axis] += value;
}
/* Function to update the state of a joystick - called as a device poll.
* This function shouldn't update the joystick structure directly,
* but instead should call SDL_PrivateJoystick*() to deliver events
* and update joystick device state.
*/
static __inline__ void JS_HandleEvents(SDL_Joystick *joystick)
{
struct js_event events[32];
int i, len;
Uint8 other_axis;
864
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866
867
868
869
870
#ifndef NO_LOGICAL_JOYSTICKS
if (SDL_joylist[joystick->index].fname == NULL) {
SDL_joylist_head(i, joystick->index);
return JS_HandleEvents(SDL_joylist[i].joy);
}
#endif
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875
876
while ((len=read(joystick->hwdata->fd, events, (sizeof events))) > 0) {
len /= sizeof(events[0]);
for ( i=0; i<len; ++i ) {
switch (events[i].type & ~JS_EVENT_INIT) {
case JS_EVENT_AXIS:
if ( events[i].number < joystick->naxes ) {
877
878
879
880
#ifndef NO_LOGICAL_JOYSTICKS
if (!LogicalJoystickAxis(joystick,
events[i].number, events[i].value))
#endif
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883
884
885
SDL_PrivateJoystickAxis(joystick,
events[i].number, events[i].value);
break;
}
events[i].number -= joystick->naxes;
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887
888
889
890
891
other_axis = (events[i].number / 2);
if ( other_axis < joystick->nhats ) {
HandleHat(joystick, other_axis,
events[i].number%2,
events[i].value);
break;
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902
}
events[i].number -= joystick->nhats*2;
other_axis = (events[i].number / 2);
if ( other_axis < joystick->nballs ) {
HandleBall(joystick, other_axis,
events[i].number%2,
events[i].value);
break;
}
break;
case JS_EVENT_BUTTON:
903
904
905
906
#ifndef NO_LOGICAL_JOYSTICKS
if (!LogicalJoystickButton(joystick,
events[i].number, events[i].value))
#endif
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933
934
SDL_PrivateJoystickButton(joystick,
events[i].number, events[i].value);
break;
default:
/* ?? */
break;
}
}
}
}
#ifdef USE_INPUT_EVENTS
static __inline__ int EV_AxisCorrect(SDL_Joystick *joystick, int which, int value)
{
struct axis_correct *correct;
correct = &joystick->hwdata->abs_correct[which];
if ( correct->used ) {
if ( value > correct->coef[0] ) {
if ( value < correct->coef[1] ) {
return 0;
}
value -= correct->coef[1];
} else {
value -= correct->coef[0];
}
value *= correct->coef[2];
value >>= 14;
}
935
936
/* Clamp and return */
937
if ( value < -32768 ) return -32768;
938
939
if ( value > 32767 ) return 32767;
940
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942
943
944
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946
947
948
return value;
}
static __inline__ void EV_HandleEvents(SDL_Joystick *joystick)
{
struct input_event events[32];
int i, len;
int code;
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950
951
952
953
954
955
#ifndef NO_LOGICAL_JOYSTICKS
if (SDL_joylist[joystick->index].fname == NULL) {
SDL_joylist_head(i, joystick->index);
return EV_HandleEvents(SDL_joylist[i].joy);
}
#endif
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963
while ((len=read(joystick->hwdata->fd, events, (sizeof events))) > 0) {
len /= sizeof(events[0]);
for ( i=0; i<len; ++i ) {
code = events[i].code;
switch (events[i].type) {
case EV_KEY:
if ( code >= BTN_MISC ) {
code -= BTN_MISC;
964
965
966
967
968
#ifndef NO_LOGICAL_JOYSTICKS
if (!LogicalJoystickButton(joystick,
joystick->hwdata->key_map[code],
events[i].value))
#endif
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989
SDL_PrivateJoystickButton(joystick,
joystick->hwdata->key_map[code],
events[i].value);
}
break;
case EV_ABS:
switch (code) {
case ABS_HAT0X:
case ABS_HAT0Y:
case ABS_HAT1X:
case ABS_HAT1Y:
case ABS_HAT2X:
case ABS_HAT2Y:
case ABS_HAT3X:
case ABS_HAT3Y:
code -= ABS_HAT0X;
HandleHat(joystick, code/2, code%2,
events[i].value);
break;
default:
events[i].value = EV_AxisCorrect(joystick, code, events[i].value);
990
991
992
993
994
#ifndef NO_LOGICAL_JOYSTICKS
if (!LogicalJoystickAxis(joystick,
joystick->hwdata->abs_map[code],
events[i].value))
#endif
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997
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999
1000
SDL_PrivateJoystickAxis(joystick,
joystick->hwdata->abs_map[code],
events[i].value);
break;
}
break;