# HG changeset patch # User John Tsiombikas # Date 1310530377 -10800 # Node ID 15293518d92b003ea6c0ccce309713293729fd71 first version, combined joystick seems to be working, max 32 buttons. diff -r 000000000000 -r 15293518d92b COPYING --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/COPYING Wed Jul 13 07:12:57 2011 +0300 @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff -r 000000000000 -r 15293518d92b Makefile --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Makefile Wed Jul 13 07:12:57 2011 +0300 @@ -0,0 +1,13 @@ +src = $(wildcard *.c) +obj = $(src:.c=.o) +bin = combjs + +CC = gcc +CFLAGS = -pedantic -Wall -g + +$(bin): $(obj) + $(CC) -o $@ $(obj) $(LDFLAGS) + +.PHONY: clean +clean: + rm -f $(obj) $(bin) diff -r 000000000000 -r 15293518d92b README --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README Wed Jul 13 07:12:57 2011 +0300 @@ -0,0 +1,8 @@ +combjs - 0.1 +Author: John Tsiombikas + +Combjs allows you to combine multiple joystick devices into one virtual +joystick. This is mainly useful to play games that support a single joystick, or +in any case less joysticks than the number of joysticks you want to use. + +TODO: write detailed usage information. for now just run with -h. diff -r 000000000000 -r 15293518d92b combjs.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/combjs.c Wed Jul 13 07:12:57 2011 +0300 @@ -0,0 +1,313 @@ +/* +combjs - combine multiple joysticks in one virtual joystick +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DBG_MAX_BN 32 + +struct joystick { + char *name; + int fd; + int num_bn, num_axes; + int bn_offset, axis_offset; + + struct joystick *next; +}; + +void cleanup(void); +int create_virt_js(const char *uinput_dev, const char *devname); +int handle_event(struct joystick *js, struct js_event *ev); +int add_joystick(const char *devfile); +void sig_handler(int sig); +int proc_cmdline(int argc, char **argv); +void print_usage(const char *argv0); + + +int vfd = -1; +const char *virt_dev_name = "combjs - virtual multi-joystick combiner"; +const char *uinput_dev_name = "/dev/uinput"; +struct joystick *jslist, *jstail; +int num_vaxes, num_vbn; + + +int main(int argc, char **argv) +{ + signal(SIGINT, sig_handler); + signal(SIGQUIT, sig_handler); + signal(SIGTERM, sig_handler); + + if(proc_cmdline(argc, argv) == -1) { + return 1; + } + + if((vfd = create_virt_js(uinput_dev_name, virt_dev_name)) == -1) { + cleanup(); + return 1; + } + + for(;;) { + fd_set rdset; + struct joystick *js = jslist; + int maxfd = jstail->fd; /* XXX precalc */ + + FD_ZERO(&rdset); + while(js) { + FD_SET(js->fd, &rdset); + if(js->fd > maxfd) { + maxfd = js->fd; + } + js = js->next; + } + + while(select(maxfd + 1, &rdset, 0, 0, 0) == -1 && errno == EINTR); + + js = jslist; + while(js) { + if(FD_ISSET(js->fd, &rdset)) { + struct js_event ev; + if(read(js->fd, &ev, sizeof ev) > 0) { + handle_event(js, &ev); + } + } + js = js->next; + } + } + + return 0; +} + +void cleanup(void) +{ + while(jslist) { + struct joystick *js = jslist; + jslist = jslist->next; + + close(js->fd); + free(js->name); + free(js); + } + + if(vfd >= 0) { + ioctl(vfd, UI_DEV_DESTROY); + close(vfd); + } +} + +int create_virt_js(const char *uinput_dev, const char *devname) +{ + int i, fd; + struct uinput_user_dev uidev; + + if((fd = open(uinput_dev, O_WRONLY | O_NONBLOCK)) == -1) { + perror("failed to open uinput device"); + return -1; + } + + if(ioctl(fd, UI_SET_EVBIT, EV_ABS) == -1) { + close(fd); + return -1; + } + if(ioctl(fd, UI_SET_EVBIT, EV_KEY) == -1) { + close(fd); + return -1; + } + if(ioctl(fd, UI_SET_EVBIT, EV_SYN) == -1) { + close(fd); + return -1; + } + + memset(&uidev, 0, sizeof uidev); + strncpy(uidev.name, devname, UINPUT_MAX_NAME_SIZE); + uidev.id.bustype = BUS_USB; + uidev.id.vendor = 0x1234; + uidev.id.product = 0xfedc; + uidev.id.version = 1; + + for(i=0; i= DBG_MAX_BN) break; + ioctl(fd, UI_SET_KEYBIT, i + BTN_0); + } + + for(i=0; itype & JS_EVENT_AXIS) { + evout.type = EV_ABS; + evout.code = evin->number + js->axis_offset; + evout.value = evin->value; + + } else if(evin->type & JS_EVENT_BUTTON) { + evout.type = EV_KEY; + evout.code = evin->number + js->bn_offset + BTN_0; + evout.value = evin->value; + + if(evout.code >= BTN_0 + DBG_MAX_BN) return 0; + + } else { + return 0; + } + + if(write(vfd, &evout, sizeof evout) == -1) { + perror("failed to generate virtual joystick event"); + return -1; + } + return 0; +} + +int add_joystick(const char *devfile) +{ + struct joystick *js; + char buf[512]; + + if(!(js = calloc(1, sizeof *js))) { + perror("failed to allocate memory"); + goto err; + } + + if((js->fd = open(devfile, O_RDONLY | O_NONBLOCK)) == -1) { + fprintf(stderr, "failed to open %s: %s\n", devfile, strerror(errno)); + goto err; + } + + if(ioctl(js->fd, JSIOCGNAME(sizeof buf), buf) == -1) { + fprintf(stderr, "failed to get joystick name for %s: %s\n", devfile, strerror(errno)); + strcpy(buf, ""); + } + if(!(js->name = malloc(strlen(buf) + 1))) { + perror("failed to allocate memory"); + goto err; + } + strcpy(js->name, buf); + + if(ioctl(js->fd, JSIOCGBUTTONS, &js->num_bn) == -1) { + fprintf(stderr, "failed to get joystick %s's number of buttons: %s\n", devfile, strerror(errno)); + goto err; + } + if(ioctl(js->fd, JSIOCGAXES, &js->num_axes) == -1) { + fprintf(stderr, "failed to get joystick %s's number of axes: %s\n", devfile, strerror(errno)); + goto err; + } + + if(!jstail) { + jslist = jstail = js; + } else { + js->axis_offset = jstail->axis_offset + jstail->num_axes; + js->bn_offset = jstail->bn_offset + jstail->num_bn; + jstail->next = js; + jstail = js; + } + + num_vaxes = js->axis_offset + js->num_axes; + num_vbn = js->bn_offset + js->num_bn; + + printf("added joystick %s: %s\n", devfile, js->name); + printf(" - %d axes (offset: %d)\n", js->num_axes, js->axis_offset); + printf(" - %d buttons (offset: %d)\n", js->num_bn, js->bn_offset); + return 0; + +err: + if(js) { + close(js->fd); + free(js->name); + free(js); + } + return -1; +} + +void sig_handler(int sig) +{ + cleanup(); + exit(0); +} + +int proc_cmdline(int argc, char **argv) +{ + int i; + + for(i=1; i [dev1] ... [dev n]\n", argv0); +}