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/* Title: USB Joystick library
Version 0.2
Written by Puck2099 (puck2099@gmail.com), (c) 2006.
<http://www.gp32wip.com>
If you use this library or a part of it, please, let it know.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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
Lesser General Public License for more details.
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdio.h> /* For the definition of NULL */
#include <sys/types.h> // For Device open
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h> // For Device read
#include <string.h>
#include <limits.h> /* For the definition of PATH_MAX */
#include <linux/joystick.h>
#include "usbjoy.h"
/*
Function: joy_open
Opens a USB joystick and fills its information.
Parameters:
joynumber - Joystick's identifier (0 reserved for GP2X's builtin Joystick).
Returns:
Filled usbjoy structure.
*/
struct usbjoy * joy_open (int joynumber) {
int fd, i;
char path [128];
struct usbjoy * joy = NULL;
system ("insmod joydev"); // Loads joydev module
if (joynumber == 0) {
}
else if (joynumber > 0) {
sprintf (path, "/dev/input/js%d", joynumber-1);
fd = open(path, O_RDONLY, 0);
if (fd > 0) {
joy = (struct usbjoy *) malloc(sizeof(struct usbjoy));
// Joystick's file descriptor
joy->fd = fd;
// Set the joystick to non-blocking read mode
fcntl(joy->fd, F_SETFL, O_NONBLOCK);
// Joystick's name
ioctl(joy->fd, JSIOCGNAME(128*sizeof(char)), joy->name);
// Joystick's device
sprintf (joy->device, path);
// Joystick's buttons
ioctl(joy->fd, JSIOCGBUTTONS, &joy->numbuttons);
// Joystick's axes
ioctl(joy->fd, JSIOCGAXES, &joy->numaxes);
// Clean buttons and axes
for (i=0; i<32; i++) joy->statebuttons[i] = 0;
for (i=0; i<4; i++) joy->stateaxes[i] = 0;
}
else {
printf ("ERROR: No Joystick found\n");
}
}
return joy;
}
/*
Function: joy_name
Returns Joystick's name.
Parameters:
joy - Selected joystick.
Returns:
Joystick's name or NULL if <usbjoy> struct is empty.
*/
char * joy_name (struct usbjoy * joy) {
if (joy != NULL) return joy->name;
else return NULL;
}
/*
Function: joy_device
Returns Joystick's device.
Parameters:
joy - Selected joystick.
Returns:
Joystick's device or NULL if <usbjoy> struct is empty.
*/
char * joy_device (struct usbjoy * joy) {
if (joy != NULL) return joy->device;
else return NULL;
}
/*
Function: joy_buttons
Returns Joystick's buttons number.
Parameters:
joy - Selected joystick.
Returns:
Joystick's buttons or 0 if <usbjoy> struct is empty.
*/
int joy_buttons (struct usbjoy * joy) {
if (joy != NULL) return joy->numbuttons;
else return 0;
}
/*
Function: joy_axes
Returns Joystick's axes number.
Parameters:
joy - Selected joystick.
Returns:
Joystick's axes or 0 if <usbjoy> struct is empty.
*/
int joy_axes (struct usbjoy * joy) {
if (joy != NULL) return joy->numaxes;
else return 0;
}
/*
Function: joy_update
Updates Joystick's internal information (<statebuttons> and <stateaxes> fields).
Parameters:
joy - Selected joystick.
Returns:
0 - No events registered (no need to update).
1 - Events registered (a button or axe has been pushed).
-1 - Error: <usbjoy> struct is empty.
*/
int joy_update (struct usbjoy * joy) {
struct js_event events[0xff];
int i, len;
int event = 0;
if (joy != NULL) {
if ((len=read(joy->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 == 0) {
joy->stateaxes[JOYLEFT] = joy->stateaxes[JOYRIGHT] = 0;
if (events[i].value < 0) joy->stateaxes[JOYLEFT] = 1;
else if (events[i].value > 0) joy->stateaxes[JOYRIGHT] = 1;
}
else if (events[i].number == 1) {
joy->stateaxes[JOYUP] = joy->stateaxes[JOYDOWN] = 0;
if (events[i].value < 0) joy->stateaxes[JOYUP] = 1;
else if (events[i].value > 0) joy->stateaxes[JOYDOWN] = 1;
}
event = 1;
break;
case JS_EVENT_BUTTON:
joy->statebuttons[events[i].number] = events[i].value;
event = 1;
break;
default:
break;
}
}
}
}
else {
event = -1;
}
return event;
}
/*
Function: joy_getbutton
Returns Joystick's button information.
Parameters:
button - Button which value you want to know (from 0 to 31).
joy - Selected joystick.
Returns:
0 - Button NOT pushed.
1 - Button pushed.
-1 - Error: <usbjoy> struct is empty.
*/
int joy_getbutton (int button, struct usbjoy * joy) {
if (joy != NULL) {
if (button < joy_buttons(joy)) return joy->statebuttons[button];
else return 0;
}
else return -1;
}
/*
Function: joy_getaxe
Returns Joystick's axes information.
Parameters:
axe - Axe which value you want to know (see <Axes values>).
joy - Selected joystick.
Returns:
0 - Direction NOT pushed.
1 - Direction pushed.
-1 - Error: <usbjoy> struct is empty.
*/
int joy_getaxe (int axe, struct usbjoy * joy) {
if (joy != NULL) {
if (axe < 4) return joy->stateaxes[axe];
else return 0;
}
else return -1;
}
/*
Function: joy_close
Closes selected joystick's file descriptor and detroys it's fields.
Parameters:
joy - Selected joystick.
Returns:
0 - Joystick successfully closed.
-1 - Error: <usbjoy> struct is empty.
*/
int joy_close (struct usbjoy * joy) {
if (joy != NULL) {
close (joy->fd);
free (joy);
return 0;
}
else return -1;
}
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