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lxdream.org :: lxdream/src/drivers/joy_linux.c
lxdream 0.9.1
released Jun 29
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filename src/drivers/joy_linux.c
changeset 1296:30ecee61f811
prev1010:a506a2f66180
author nkeynes
date Sat Jan 26 14:00:48 2013 +1000 (9 years ago)
permissions -rw-r--r--
last change Change glib includes to #include <glib.h> rather than the individual
headers, as recent glib versions are breaking on this
file annotate diff log raw
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/**
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 * $Id$
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 *
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 * Linux joystick input device support
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 *
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 * Copyright (c) 2008 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program 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
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 * GNU General Public License for more details.
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 */
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <ctype.h>
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#include <linux/joystick.h>
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#include <glib.h>
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#include "lxdream.h"
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#include "display.h"
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#include "maple/maple.h"
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#include "drivers/joy_linux.h"
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#define INPUT_PATH "/dev/input"
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typedef struct linux_joystick {
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    struct input_driver driver;
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    const gchar *filename;
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    char name[128];
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    int fd;
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    int button_count, axis_count;
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    GIOChannel *channel;
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} *linux_joystick_t;
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/* Linux joysticks return data in the range -32767 to 32767 - rescale this to 
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 * -127 .. 127
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 */
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#define SCALE_PRESSURE(x) ((x)>>8)
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static gboolean linux_joystick_callback( GIOChannel *source, GIOCondition condition, 
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                                         gpointer data );
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static int linux_joystick_scan();
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static linux_joystick_t linux_joystick_new( const gchar *filename, int fd );
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static uint16_t linux_joystick_resolve_keysym( input_driver_t dev, const gchar *str );
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static gchar *linux_joystick_keysym_for_keycode( input_driver_t dev, uint16_t keycode );
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static void linux_joystick_destroy( input_driver_t joy );
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static gboolean linux_joystick_install_watch( const gchar *dir );
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static void linux_joystick_uninstall_watch( void );
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/**
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 * Convert keysym to keycode. Keysyms are either Button%d or Axis%d[+-], with buttons
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 * numbered 1 .. button_count, then axes from button_count+1 .. button_count + axis_count*2.
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 * The first button is Button1. (no Button0)
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 * The first axis is Axis1+, then Axis1-, Axis2+ and so forth.
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 */
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static uint16_t linux_joystick_resolve_keysym( input_driver_t dev, const gchar *str )
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{
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    linux_joystick_t joy = (linux_joystick_t)dev;
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    if( strncasecmp( str, "Button", 6 ) == 0 ){
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        unsigned long button = strtoul( str+6, NULL, 10 );
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        if( button > joy->button_count ) {
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            return 0;
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        }
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        return (uint16_t)button;
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    } else if( strncasecmp( str, "Axis", 4 ) == 0 ) {
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        char *endptr;
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        unsigned long axis = strtoul( str+4, &endptr, 10 );
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        if( axis > joy->axis_count || axis == 0 ) {
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            return 0;
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        }
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        int keycode = ((axis - 1) << 1) + joy->button_count + 1;
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        if( *endptr == '-' ) {
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            return keycode + 1;
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        } else {
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            return keycode;
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        }
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    } else {
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        return 0;
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    }
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}
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static gchar *linux_joystick_keysym_for_keycode( input_driver_t dev, uint16_t keycode )
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{
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    linux_joystick_t joy = (linux_joystick_t)dev;
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    if( keycode == 0 ) {
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        return NULL;
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    }
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    if( keycode <= joy->button_count ) {
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        return g_strdup_printf( "Button%d", keycode );
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    }
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    if( keycode <= joy->button_count + joy->axis_count*2 ) {
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        int axis = keycode - joy->button_count - 1;
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        if( (axis & 1) == 0 ) {
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            return g_strdup_printf( "Axis%d+", (axis >> 1)+1 );
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        } else {
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            return g_strdup_printf( "Axis%d-", (axis >> 1)+1 );
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        }
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    }
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    return NULL;
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}
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static void linux_joystick_destroy( input_driver_t dev )
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{
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    linux_joystick_t joy = (linux_joystick_t)dev;
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    g_free( (gchar *)joy->filename );
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    g_io_channel_shutdown(joy->channel, FALSE, NULL );
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    g_io_channel_unref(joy->channel);
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    g_free( joy );
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}
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/**
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 * Callback from the GIOChannel whenever data is available, or an error/disconnect
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 * occurs.
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 *
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 * On data, process all pending events and direct them to the input system.
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 * On error, close the channel and delete the device.
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 */
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static gboolean linux_joystick_callback( GIOChannel *source, GIOCondition condition, 
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                                         gpointer data )
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{
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    linux_joystick_t joy = (linux_joystick_t)data;
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    if( condition & G_IO_HUP ) {
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        INFO( "Joystick '%s' disconnected\n", joy->name );
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        input_unregister_device((input_driver_t)joy);
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        return FALSE;
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    }
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    if( condition & G_IO_IN ) {
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        struct js_event event;
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        while( read( joy->fd, &event, sizeof(event) ) == sizeof(event) ) {
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            if( event.type == JS_EVENT_BUTTON ) {
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                int keycode = event.number+1;
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                if( event.value == 0 ) {
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                    input_event_keyup( (input_driver_t)joy, keycode );
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                } else {
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                    input_event_keydown( (input_driver_t)joy, keycode, MAX_PRESSURE );
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                }
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            } else if( event.type == JS_EVENT_AXIS ) {
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                int keycode = (event.number*2) + joy->button_count + 1;
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                if( event.value == 0 ) {
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                    input_event_keyup( (input_driver_t)joy, keycode );
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                    input_event_keyup( (input_driver_t)joy, keycode+1 );
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                } else if( event.value < 0 ) {
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                    input_event_keyup( (input_driver_t)joy, keycode );
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                    input_event_keydown( (input_driver_t)joy, keycode+1, SCALE_PRESSURE(-event.value) );
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                } else {
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                    input_event_keyup( (input_driver_t)joy, keycode+1 );
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                    input_event_keydown( (input_driver_t)joy, keycode, SCALE_PRESSURE(event.value) );
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                }
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            }
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        }
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    }
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    return TRUE;
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}
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/**
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 * Create a new joystick device structure given filename and (open) file
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 * descriptor. The joystick is automatically added to the watch list.
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 * @return The new joystick, or NULL if an error occurred.
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 */
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static linux_joystick_t linux_joystick_new( const gchar *filename, int fd )
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{
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    linux_joystick_t joy = g_malloc0(sizeof(struct linux_joystick));
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    joy->filename = filename;
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    joy->fd = fd;
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    joy->name[0] = '\0';
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    joy->driver.resolve_keysym = linux_joystick_resolve_keysym;
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    joy->driver.get_keysym_for_keycode = linux_joystick_keysym_for_keycode;
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    joy->driver.destroy = linux_joystick_destroy;
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    char *p = strrchr(filename, '/');
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    if( p == NULL ) {
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        joy->driver.id = filename;
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    } else {
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        joy->driver.id = p+1;
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    }
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    if( ioctl( fd, JSIOCGNAME(128), joy->name ) == -1 ||
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            ioctl( fd, JSIOCGAXES, &joy->axis_count ) == -1 || 
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            ioctl( fd, JSIOCGBUTTONS, &joy->button_count ) == -1 ) {
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        ERROR( "Error reading joystick data from %s (%s)\n", filename, strerror(errno) );
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        g_free(joy);
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        return NULL;
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    }
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    joy->channel = g_io_channel_unix_new(fd);
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    g_io_add_watch( joy->channel, G_IO_IN|G_IO_ERR|G_IO_HUP, linux_joystick_callback, joy );
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    return joy;
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}
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static int linux_joystick_scan()
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{
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    int joysticks = 0;
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    struct dirent *ent;
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    DIR *dir = opendir(INPUT_PATH);
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    if( dir == NULL ) {
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        return 0;
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    }
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    while( (ent = readdir(dir)) != NULL ) {
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        if( ent->d_name[0] == 'j' && ent->d_name[1] == 's' &&
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                isdigit(ent->d_name[2]) && !input_has_device(ent->d_name) ) {
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            gchar *name = g_strdup_printf( "%s/%s", INPUT_PATH, ent->d_name );
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            int fd = open(name, O_RDONLY|O_NONBLOCK);
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            if( fd == -1 ) {
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                g_free( name );
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            } else {
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                linux_joystick_t joy = linux_joystick_new( name, fd );
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                input_register_device( (input_driver_t)joy, (joy->axis_count*2) + joy->button_count );
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                INFO( "Attached joystick %s named '%s', (%d buttons, %d axes)", 
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                      joy->driver.id, joy->name, joy->button_count, joy->axis_count );
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                joysticks++;
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            }
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        }
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    }
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    closedir(dir);
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    return joysticks;
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}
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gboolean linux_joystick_init()
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{
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    if( !linux_joystick_install_watch(INPUT_PATH) ) {
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        return FALSE;
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    }
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    linux_joystick_scan();
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    return TRUE;
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}
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void linux_joystick_shutdown(void)
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{
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    linux_joystick_uninstall_watch();
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}
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/*************************** dnotify support **********************/
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static volatile int need_input_rescan = 0;
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static int watch_dir_fd;
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static gboolean gtk_loop_check_input(gpointer data)
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{
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    if( need_input_rescan == 1 ) {
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        need_input_rescan = 0;
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        int js = linux_joystick_scan();
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        if( js > 0 ) {
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            maple_reattach_all();
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        }
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    }
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    return need_input_rescan != 2;
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}
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static void dnotify_handler(int sig )
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{
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    need_input_rescan = 1;
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}
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static gboolean linux_joystick_install_watch( const gchar *dir )
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{
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    int fd = open( dir, O_RDONLY|O_NONBLOCK );
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    if( fd == -1 ) {
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        return FALSE;
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    }
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    signal( SIGRTMIN+1, dnotify_handler );
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    fcntl(fd, F_SETSIG, SIGRTMIN + 1);
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    if( fcntl(fd, F_NOTIFY, DN_CREATE|DN_MULTISHOT) == -1 ) {
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        close(fd);
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        return FALSE;
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    }
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    watch_dir_fd = fd;
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    g_timeout_add( 500, gtk_loop_check_input, NULL );
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    return TRUE;
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}
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static void linux_joystick_uninstall_watch(void)
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{
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    signal( SIGRTMIN+1, SIG_IGN );
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    close( watch_dir_fd );
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    need_input_rescan = 2;
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}
.