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#include "../config.h"
#ifdef HAVE_JOYSTICK
#include "joystick.h"
#include "input.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#ifndef JOY_AXIS_DELTA
#define JOY_AXIS_DELTA 500
#endif
#ifndef JS_DEV
#define JS_DEV "/dev/input/js0"
#endif
#ifdef TARGET_LINUX
#include <linux/joystick.h>
static int buttons = 0;
static int* axis;
int mp_input_joystick_init(char* dev) {
int fd,l=0;
int inited = 0;
struct js_event ev;
char n_axis;
printf("Opening joystick device %s\n",dev ? dev : JS_DEV);
fd = open( dev ? dev : JS_DEV , O_RDONLY | O_NONBLOCK );
if(fd < 0) {
printf("Can't open joystick device %s : %s\n",dev ? dev : JS_DEV,strerror(errno));
return -1;
}
if(ioctl(fd, JSIOCGAXES, &n_axis) < 0) {
printf("Joystick : can't get number of axis, %s\n",strerror(errno));
close(fd);
return -1;
}
axis = (int*)malloc(n_axis*sizeof(int));
while(! inited) {
l = 0;
while((unsigned int)l < sizeof(struct js_event)) {
int r = read(fd,&ev+l,sizeof(struct js_event)-l);
if(r < 0) {
if(errno == EINTR)
continue;
else if(errno == EAGAIN) {
inited = 1;
break;
}
printf("Error while reading joystick device : %s\n",strerror(errno));
close(fd);
return -1;
}
l += r;
}
if((unsigned int)l < sizeof(struct js_event)) {
if(l > 0)
printf("Joystick : we loose %d bytes of data\n",l);
return fd;
}
if(ev.type & JS_EVENT_INIT) {
ev.type &= ~JS_EVENT_INIT;
if(ev.type & JS_EVENT_BUTTON)
buttons |= (ev.value << ev.number);
else if(ev.type & JS_EVENT_AXIS)
axis[ev.number] = ev.value;
} else
printf("Joystick : Warning non-init event during init :-o\n");
}
return fd;
}
int mp_input_joystick_read(int fd) {
struct js_event ev;
int l=0;
while((unsigned int)l < sizeof(struct js_event)) {
int r = read(fd,&ev+l,sizeof(struct js_event)-l);
if(r <= 0) {
if(errno == EINTR)
continue;
else if(errno == EAGAIN)
return MP_INPUT_NOTHING;
if( r < 0)
printf("Joystick error while reading joystick device : %s\n",strerror(errno));
else
printf("Joystick error while reading joystick device : EOF\n");
return MP_INPUT_DEAD;
}
l += r;
}
if((unsigned int)l < sizeof(struct js_event)) {
if(l > 0)
printf("Joystick : we loose %d bytes of data\n",l);
return MP_INPUT_NOTHING;
}
if(ev.type & JS_EVENT_INIT) {
printf("Joystick : warning reinit (Can happend more than on time)\n");
ev.type &= ~JS_EVENT_INIT;
if(ev.type & JS_EVENT_BUTTON)
buttons |= (ev.value << ev.number);
else if(ev.type & JS_EVENT_AXIS)
axis[ev.number] = ev.value;
else
printf("Joystick warning unknow event type %d\n",ev.type);
return mp_input_joystick_read(fd);
}
ev.type &= ~JS_EVENT_INIT;
if(ev.type & JS_EVENT_BUTTON) {
int b = buttons | (ev.value << ev.number);
if(b != buttons)
return JOY_BTN0+ev.number;
} else if(ev.type & JS_EVENT_AXIS) {
if(ev.value - axis[ev.number] > JOY_AXIS_DELTA)
return ev.number == 0 ? JOY_UP : JOY_LEFT;
else if(axis[ev.number] - ev.value > JOY_AXIS_DELTA)
return ev.number == 0 ? JOY_DOWN : JOY_RIGHT;
} else {
printf("Joystick warning unknow event type %d\n",ev.type);
return MP_INPUT_ERROR;
}
return MP_INPUT_NOTHING;
}
#else
// dummy function
int mp_input_joystick_init(char* dev) {
return -1;
}
int mp_input_joystick_read(int fd) {
return MP_INPUT_NOTHING;
}
#endif
#endif
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