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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>
int axis[10];
int btns = 0;
int mp_input_joystick_init(char* dev) {
int fd,l=0;
int inited = 0;
struct js_event ev;
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;
}
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);
break;
}
ev.type &= ~JS_EVENT_INIT;
if(ev.type == JS_EVENT_BUTTON)
btns |= (ev.value << ev.number);
if(ev.type == JS_EVENT_AXIS)
axis[ev.number] = ev.value;
}
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 init event, we have lost sync with driver\n");
ev.type &= ~JS_EVENT_INIT;
if(ev.type == JS_EVENT_BUTTON) {
int s = (btns >> ev.number) & 1;
if(s == ev.value) // State is the same : ignore
return MP_INPUT_NOTHING;
}
if(ev.type == JS_EVENT_AXIS) {
if( ( axis[ev.number] == 1 && ev.value > JOY_AXIS_DELTA) ||
(axis[ev.number] == -1 && ev.value < -JOY_AXIS_DELTA) ||
(axis[ev.number] == 0 && ev.value >= -JOY_AXIS_DELTA && ev.value <= JOY_AXIS_DELTA)
) // State is the same : ignore
return MP_INPUT_NOTHING;
}
}
if(ev.type & JS_EVENT_BUTTON) {
btns &= ~(1 << ev.number);
btns |= (ev.value << ev.number);
if(ev.value == 1)
return ((JOY_BTN0+ev.number) | MP_KEY_DOWN);
else
return (JOY_BTN0+ev.number);
} else if(ev.type & JS_EVENT_AXIS) {
if(ev.value < -JOY_AXIS_DELTA && axis[ev.number] != -1) {
axis[ev.number] = -1;
return (JOY_AXIS0_MINUS+(2*ev.number)) | MP_KEY_DOWN;
} else if(ev.value > JOY_AXIS_DELTA && axis[ev.number] != 1) {
axis[ev.number] = 1;
return (JOY_AXIS0_PLUS+(2*ev.number)) | MP_KEY_DOWN;
} else if(ev.value <= JOY_AXIS_DELTA && ev.value >= -JOY_AXIS_DELTA && axis[ev.number] != 0) {
int r = axis[ev.number] == 1 ? JOY_AXIS0_PLUS+(2*ev.number) : JOY_AXIS0_MINUS+(2*ev.number);
axis[ev.number] = 0;
return r;
} else
return MP_INPUT_NOTHING;
} 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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