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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@2 be3aeb3a-fb24-0410-a615-afba39da0efa
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424
gp2x/usbjoy.c
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424
gp2x/usbjoy.c
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/* Title: USB Joystick library
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Version 0.2
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Written by Puck2099 (puck2099@gmail.com), (c) 2006.
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<http://www.gp32wip.com>
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If you use this library or a part of it, please, let it know.
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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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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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
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <stdio.h> /* For the definition of NULL */
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#include <sys/types.h> // For Device open
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h> // For Device read
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#include <string.h>
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#include <limits.h> /* For the definition of PATH_MAX */
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#include <linux/joystick.h>
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#include "usbjoy.h"
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/*
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Function: joy_open
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Opens a USB joystick and fills its information.
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Parameters:
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joynumber - Joystick's identifier (0 reserved for GP2X's builtin Joystick).
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Returns:
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Filled usbjoy structure.
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*/
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struct usbjoy *joy_open(int joynumber)
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{
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int fd;
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char path [128];
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struct usbjoy * joy = NULL;
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struct js_event event;
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static char insmod_done = 0;
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// notaz: on my system I get unresolved input_* symbols, so have to 'insmod input' too
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// also we should insmod only once, not on every joy_open() call.
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if (!insmod_done) {
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system ("insmod input");
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system ("insmod joydev"); // Loads joydev module
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insmod_done = 1;
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}
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if (joynumber == 0) {
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}
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else if (joynumber > 0) {
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sprintf (path, "/dev/input/js%d", joynumber-1);
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fd = open(path, O_RDONLY, 0);
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if (fd > 0) {
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joy = (struct usbjoy *) malloc(sizeof(*joy));
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if (joy == NULL) { close(fd); return NULL; }
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memset(joy, 0, sizeof(*joy));
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// Set the joystick to non-blocking read mode
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fcntl(fd, F_SETFL, O_NONBLOCK);
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// notaz: maybe we should flush init events now.
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// My pad returns axis as active when I plug it in, which is kind of annoying.
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while (read(fd, &event, sizeof(event)) > 0);
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// Joystick's file descriptor
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joy->fd = fd;
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// Joystick's name
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ioctl(joy->fd, JSIOCGNAME(128*sizeof(char)), joy->name);
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// Joystick's device
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strcpy(joy->device, path);
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// Joystick's buttons
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ioctl(joy->fd, JSIOCGBUTTONS, &joy->numbuttons);
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// Joystick's axes
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ioctl(joy->fd, JSIOCGAXES, &joy->numaxes);
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// Joystick's type (derived from name)
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if (strncasecmp(joy->name, "logitech", strlen("logitech")) == 0)
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joy->type = JOY_TYPE_LOGITECH;
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else joy->type = JOY_TYPE_GENERIC;
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} else {
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// printf ("ERROR: No Joystick found\n");
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}
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}
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return joy;
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}
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/*
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Function: joy_name
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Returns Joystick's name.
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Parameters:
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joy - Selected joystick.
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Returns:
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Joystick's name or NULL if <usbjoy> struct is empty.
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*/
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char * joy_name (struct usbjoy * joy) {
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if (joy != NULL) return joy->name;
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else return NULL;
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}
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/*
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Function: joy_device
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Returns Joystick's device.
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Parameters:
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joy - Selected joystick.
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Returns:
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Joystick's device or NULL if <usbjoy> struct is empty.
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*/
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char * joy_device (struct usbjoy * joy) {
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if (joy != NULL) return joy->device;
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else return NULL;
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}
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/*
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Function: joy_buttons
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Returns Joystick's buttons number.
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Parameters:
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joy - Selected joystick.
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Returns:
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Joystick's buttons or 0 if <usbjoy> struct is empty.
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*/
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int joy_buttons (struct usbjoy * joy) {
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if (joy != NULL) return joy->numbuttons;
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else return 0;
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}
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/*
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Function: joy_axes
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Returns Joystick's axes number.
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Parameters:
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joy - Selected joystick.
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Returns:
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Joystick's axes or 0 if <usbjoy> struct is empty.
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*/
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int joy_axes (struct usbjoy * joy) {
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if (joy != NULL) return joy->numaxes;
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else return 0;
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}
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/*
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Function: joy_update
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Updates Joystick's internal information (<statebuttons> and <stateaxes> fields).
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Parameters:
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joy - Selected joystick.
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Returns:
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0 - No events registered (no need to update).
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1 - Events registered (a button or axe has been pushed).
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-1 - Error: <usbjoy> struct is empty.
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*/
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int joy_update (struct usbjoy * joy) {
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struct js_event events[0xff];
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int i, len;
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int event = 0;
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if (joy != NULL) {
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if ((len=read(joy->fd, events, (sizeof events))) >0) {
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len /= sizeof(events[0]);
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for ( i=0; i<len; ++i ) {
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switch (events[i].type & ~JS_EVENT_INIT) {
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case JS_EVENT_AXIS:
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if (events[i].number == 0) {
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if (events[i].value == 0) joy->stateaxes[JOYLEFT] = joy->stateaxes[JOYRIGHT] = 0;
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else if (events[i].value < 0) joy->stateaxes[JOYLEFT] = 1;
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else joy->stateaxes[JOYRIGHT] = 1;
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}
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else if (events[i].number == 1) {
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if (events[i].value == 0) joy->stateaxes[JOYUP] = joy->stateaxes[JOYDOWN] = 0;
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else if (events[i].value < 0) joy->stateaxes[JOYUP] = 1;
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else joy->stateaxes[JOYDOWN] = 1;
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}
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event = 1;
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break;
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case JS_EVENT_BUTTON:
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joy->statebuttons[events[i].number] = events[i].value;
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event = 1;
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break;
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default:
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break;
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}
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}
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}
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}
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else {
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event = -1;
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}
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return event;
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}
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/*
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Function: joy_getbutton
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Returns Joystick's button information.
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Parameters:
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button - Button which value you want to know (from 0 to 31).
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joy - Selected joystick.
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Returns:
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0 - Button NOT pushed.
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1 - Button pushed.
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-1 - Error: <usbjoy> struct is empty.
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*/
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int joy_getbutton (int button, struct usbjoy * joy) {
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if (joy != NULL) {
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if (button < joy_buttons(joy)) return joy->statebuttons[button];
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else return 0;
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}
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else return -1;
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}
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/*
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Function: joy_getaxe
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Returns Joystick's axes information.
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Parameters:
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axe - Axe which value you want to know (see <Axes values>).
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joy - Selected joystick.
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Returns:
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0 - Direction NOT pushed.
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1 - Direction pushed.
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-1 - Error: <usbjoy> struct is empty.
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*/
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int joy_getaxe (int axe, struct usbjoy * joy) {
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if (joy != NULL) {
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if (axe < 4) return joy->stateaxes[axe];
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else return 0;
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}
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else return -1;
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}
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/*
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Function: joy_close
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Closes selected joystick's file descriptor and detroys it's fields.
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Parameters:
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joy - Selected joystick.
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Returns:
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0 - Joystick successfully closed.
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-1 - Error: <usbjoy> struct is empty.
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*/
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int joy_close (struct usbjoy * joy) {
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if (joy != NULL) {
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close (joy->fd);
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free (joy);
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return 0;
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}
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else return -1;
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}
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/*********************************************************************/
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/* GP2X USB Joystick Handling -GnoStiC */
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/*********************************************************************/
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#include "gp2x.h"
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int num_of_joys = 0;
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struct usbjoy *joys[4];
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void gp2x_usbjoy_init (void) {
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/* Open available joysticks -GnoStiC */
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int i, n = 0;
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printf("\n");
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for (i = 0; i < 4; i++) {
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joys[n] = joy_open(i+1);
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if (joys[n] && joy_buttons(joys[n]) > 0) {
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printf ("+-Joystick %d: \"%s\", buttons = %i\n", i+1, joy_name(joys[n]), joy_buttons(joys[n]));
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n++;
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}
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}
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num_of_joys = n;
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printf("Found %d Joystick(s)\n",num_of_joys);
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}
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void gp2x_usbjoy_update (void) {
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/* Update Joystick Event Cache */
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int q, foo;
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for (q=0; q < num_of_joys; q++) {
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foo = joy_update (joys[q]);
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}
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}
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int gp2x_usbjoy_check (int joyno) {
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/* Check Joystick */
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int q, joyExKey = 0;
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struct usbjoy *joy = joys[joyno];
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if (joy != NULL) {
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if (joy_getaxe(JOYUP, joy)) { joyExKey |= GP2X_UP; }
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if (joy_getaxe(JOYDOWN, joy)) { joyExKey |= GP2X_DOWN; }
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if (joy_getaxe(JOYLEFT, joy)) { joyExKey |= GP2X_LEFT; }
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if (joy_getaxe(JOYRIGHT, joy)) { joyExKey |= GP2X_RIGHT; }
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/* loop through joy buttons to check if they are pushed */
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for (q=0; q<joy_buttons (joy); q++) {
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if (joy_getbutton (q, joy)) {
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if (joy->type == JOY_TYPE_LOGITECH) {
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switch (q) {
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case 0: joyExKey |= GP2X_A; break;
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case 1: joyExKey |= GP2X_X; break;
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case 2: joyExKey |= GP2X_B; break;
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case 3: joyExKey |= GP2X_Y; break;
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}
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} else {
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switch (q) {
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case 0: joyExKey |= GP2X_Y; break;
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case 1: joyExKey |= GP2X_B; break;
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case 2: joyExKey |= GP2X_X; break;
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case 3: joyExKey |= GP2X_A; break;
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}
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}
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switch (q) {
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case 4: joyExKey |= GP2X_L; break;
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case 5: joyExKey |= GP2X_R; break;
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case 6: joyExKey |= GP2X_L; break; /* left shoulder button 2 */
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case 7: joyExKey |= GP2X_R; break; /* right shoulder button 2 */
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case 8: joyExKey |= GP2X_SELECT;break;
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case 9: joyExKey |= GP2X_START; break;
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case 10: joyExKey |= GP2X_PUSH; break;
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case 11: joyExKey |= GP2X_PUSH; break;
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}
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}
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}
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}
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return joyExKey;
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}
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int gp2x_usbjoy_check2 (int joyno) {
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/* Check Joystick, don't map to gp2x joy */
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int q, to, joyExKey = 0;
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struct usbjoy *joy = joys[joyno];
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if (joy != NULL) {
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if (joy_getaxe(JOYUP, joy)) { joyExKey |= 1 << 0; }
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if (joy_getaxe(JOYDOWN, joy)) { joyExKey |= 1 << 1; }
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if (joy_getaxe(JOYLEFT, joy)) { joyExKey |= 1 << 2; }
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if (joy_getaxe(JOYRIGHT, joy)) { joyExKey |= 1 << 3; }
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/* loop through joy buttons to check if they are pushed */
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to = joy->numbuttons;
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if (to > 32-4) to = 32-4;
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for (q=0; q < to; q++)
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if (joy->statebuttons[q]) joyExKey |= 1 << (q+4);
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}
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return joyExKey;
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}
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void gp2x_usbjoy_deinit (void) {
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int i;
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for (i=0; i<num_of_joys; i++) {
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joy_close (joys[i]);
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}
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num_of_joys = 0;
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}
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