initial pocketsnes commit

1 files changed, 297 insertions, 0 deletions

diff --git a/src/usbjoy.c b/src/usbjoy.c
new file mode 100644
index 0000000..81d1be4
--- /dev/null
+++ b/src/usbjoy.c
@@ -0,0 +1,297 @@
+/* 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;
+}