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/*
linuxjoystick.c:
Copyright (C) 2010 Justin Glenn Smith <noisesmith@gmail.com>
This Csound plugin 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 plugin 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 plugin; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
USAGE:
kresultmask linuxjoystick kdevice ktab
kdevice = The index of the joystick device, either /dev/js<index> or
/dev/input/js<index>
ktab = A table to hold input results, should be at least enough elements
to store one value for each stick axis and one for each button + 2.
The first two elements of the table are initialized with the number
of axes and the number of buttons, respectively, when a joystick is
opened. If a joystick is unplugged during performance, the opcode
will repeatedly attempt to reopen the device with a delay between
attempts.
kresultmask: A bitmask, with a 1 bit for each table index with a new input
received.
*/
#include "linuxjoystick.h"
#include <errno.h>
static int32_t linuxjoystick (CSOUND *csound, LINUXJOYSTICK *stick)
{
static int32_t read_pos = 0;
struct js_event js;
int32_t read_size;
int32_t getmore;
int32_t evtidx;
long long evtmask = 0;
char device[256];
if (UNLIKELY(stick->initme == 0)) {
stick->timeout = 0;
stick->devFD = -10;
stick->initme = 1;
}
if (UNLIKELY(*stick->ktable != stick->table)) {
if (UNLIKELY((void *)(stick->ftp = csound->FTnp2Find(csound, stick->ktable))
== NULL)) {
csound->Warning(csound, Str("linuxjoystick: No such table %f"),
*(float*)(stick->ktable));
return OK;
}
stick->table = *stick->ktable;
}
if (stick->devFD < 0 || *stick->kdev != stick->dev) {
if (stick->timeout > 0 && *stick->kdev == stick->dev) {
(stick->timeout)--;
return OK;
}
stick->dev = (int32_t)MYFLT2LRND(*stick->kdev);
snprintf(device, 256, "/dev/js%i", stick->dev);
if ((stick->devFD = open(device, O_RDONLY, O_NONBLOCK)) < 0) {
snprintf(device, 256, "/dev/input/js%i", stick->dev);
stick->devFD = open(device, O_RDONLY, O_NONBLOCK);
}
if (LIKELY(stick->devFD > 0)) {
fcntl(stick->devFD, F_SETFL, fcntl(stick->devFD, F_GETFL, 0)|O_NONBLOCK);
ioctl(stick->devFD, JSIOCGAXES, &stick->numk);
ioctl(stick->devFD, JSIOCGBUTTONS, &stick->numb);
if (UNLIKELY(stick->ftp->flen < 2u+(stick->numk)+(stick->numb))) {
csound->Warning
(csound,
Str("linuxjoystick: table %d of size %d too small for data size %d"),
(int32_t
)stick->table, stick->ftp->flen, 2+stick->numk+stick->numb);
return OK;
}
stick->ftp->ftable[ 0 ] = (MYFLT) stick->numk;
stick->ftp->ftable[ 1 ] = (MYFLT) stick->numb;
evtmask = 3;
}
else {
stick->timeout = 10000;
csound->Warning(csound,
Str("linuxjoystick: could not open device "
"/dev/input/js%d for reason: %s\n"),
stick->dev, strerror(errno));
csound->Warning(csound,
Str("linuxjoystick: could not open device "
"/dev/js%d for reason: %s\n"),
stick->dev, strerror(errno));
return OK;
}
}
getmore = 1;
while (getmore) {
read_size = read(stick->devFD, (void *) &js+read_pos,
sizeof(struct js_event)-read_pos);
if (read_size == -1 && errno == EAGAIN ) {
getmore = 0;
}
else if (UNLIKELY(read_size < 1)) {
csound->Warning(csound, Str("linuxjoystick: read %d closing joystick"),
read_size);
close(stick->devFD);
stick->devFD = -1;
getmore = 0;
}
else {
read_pos += read_size;
if (read_pos == sizeof(struct js_event)) {
read_pos = 0;
if (js.type & JS_EVENT_AXIS) {
evtidx = 2 + js.number;
}
else if (js.type & JS_EVENT_BUTTON) {
evtidx = 2 + stick->numk + js.number;
}
else {
csound->Warning(csound, Str("unknown joystick event type %i"),
js.type);
return OK;
}
evtmask = evtmask | (1 << evtidx);
stick->ftp->ftable[ evtidx ] = (MYFLT) js.value;
}
}
}
*stick->kresult = (MYFLT) evtmask;
return OK;
}
static OENTRY localops[] = {
{ "joystick", sizeof(LINUXJOYSTICK), 0, 2, "k", "kk",
NULL, (SUBR) linuxjoystick, NULL
},
};
LINKAGE
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