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/*
* This file is part of MPlayer.
*
* MPlayer 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 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "joystick.h"
#include "input.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "common/msg.h"
#include "keycodes.h"
#ifndef JOY_AXIS_DELTA
#define JOY_AXIS_DELTA 500
#endif
#ifndef JS_DEV
#define JS_DEV "/dev/input/js0"
#endif
#include <linux/joystick.h>
static int mp_input_joystick_read(void *ctx, int fd);
struct ctx {
struct mp_log *log;
int axis[256];
int btns;
};
static int close_js(void *ctx, int fd)
{
talloc_free(ctx);
return 0;
}
int mp_input_joystick_init(struct input_ctx *ictx, struct mp_log *log, char *dev)
{
int fd,l=0;
int initialized = 0;
struct js_event ev;
mp_verbose(log, "Opening joystick device %s\n",dev ? dev : JS_DEV);
fd = open( dev ? dev : JS_DEV , O_RDONLY | O_NONBLOCK );
if(fd < 0) {
mp_err(log, "Can't open joystick device %s: %s\n",dev ? dev : JS_DEV,strerror(errno));
return -1;
}
struct ctx *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (struct ctx) {.log = log};
while(! initialized) {
l = 0;
while((unsigned int)l < sizeof(struct js_event)) {
int r = read(fd,((char*)&ev)+l,sizeof(struct js_event)-l);
if(r < 0) {
if(errno == EINTR)
continue;
else if(errno == EAGAIN) {
initialized = 1;
break;
}
MP_ERR(ctx, "Error while reading joystick device: %s\n",strerror(errno));
close(fd);
talloc_free(ctx);
return -1;
}
l += r;
}
if((unsigned int)l < sizeof(struct js_event)) {
if(l > 0)
MP_WARN(ctx, "Joystick: We lose %d bytes of data\n",l);
break;
}
if(ev.type == JS_EVENT_BUTTON)
ctx->btns |= (ev.value << ev.number);
if(ev.type == JS_EVENT_AXIS)
ctx->axis[ev.number] = ev.value;
}
mp_input_add_fd(ictx, fd, 1, NULL, mp_input_joystick_read, close_js, ctx);
return fd;
}
static int mp_input_joystick_read(void *pctx, int fd) {
struct ctx *ctx = pctx;
struct js_event ev;
int l=0;
while((unsigned int)l < sizeof(struct js_event)) {
int r = read(fd,((char*)&ev)+l,sizeof(struct js_event)-l);
if(r <= 0) {
if(errno == EINTR)
continue;
else if(errno == EAGAIN)
return MP_INPUT_NOTHING;
if( r < 0)
MP_ERR(ctx, "Error while reading joystick device: %s\n",strerror(errno));
else
MP_ERR(ctx, "Error while reading joystick device: %s\n","EOF");
return MP_INPUT_DEAD;
}
l += r;
}
if((unsigned int)l < sizeof(struct js_event)) {
if(l > 0)
MP_WARN(ctx, "Joystick: We lose %d bytes of data\n",l);
return MP_INPUT_NOTHING;
}
if(ev.type & JS_EVENT_INIT) {
MP_WARN(ctx, "Joystick: warning init event, we have lost sync with driver.\n");
ev.type &= ~JS_EVENT_INIT;
if(ev.type == JS_EVENT_BUTTON) {
int s = (ctx->btns >> ev.number) & 1;
if(s == ev.value) // State is the same : ignore
return MP_INPUT_NOTHING;
}
if(ev.type == JS_EVENT_AXIS) {
if( ( ctx->axis[ev.number] == 1 && ev.value > JOY_AXIS_DELTA) ||
(ctx->axis[ev.number] == -1 && ev.value < -JOY_AXIS_DELTA) ||
(ctx->axis[ev.number] == 0 && ev.value >= -JOY_AXIS_DELTA && ev.value <= JOY_AXIS_DELTA)
) // State is the same : ignore
return MP_INPUT_NOTHING;
}
}
if(ev.type & JS_EVENT_BUTTON) {
ctx->btns &= ~(1 << ev.number);
ctx->btns |= (ev.value << ev.number);
if(ev.value == 1)
return (MP_JOY_BTN0 + ev.number) | MP_KEY_STATE_DOWN;
else
return (MP_JOY_BTN0 + ev.number) | MP_KEY_STATE_UP;
} else if(ev.type & JS_EVENT_AXIS) {
if(ev.value < -JOY_AXIS_DELTA && ctx->axis[ev.number] != -1) {
ctx->axis[ev.number] = -1;
return (MP_JOY_AXIS0_MINUS+(2*ev.number)) | MP_KEY_STATE_DOWN;
} else if(ev.value > JOY_AXIS_DELTA && ctx->axis[ev.number] != 1) {
ctx->axis[ev.number] = 1;
return (MP_JOY_AXIS0_PLUS+(2*ev.number)) | MP_KEY_STATE_DOWN;
} else if(ev.value <= JOY_AXIS_DELTA && ev.value >= -JOY_AXIS_DELTA && ctx->axis[ev.number] != 0) {
int r = ctx->axis[ev.number] == 1 ? MP_JOY_AXIS0_PLUS+(2*ev.number) : MP_JOY_AXIS0_MINUS+(2*ev.number);
ctx->axis[ev.number] = 0;
return r | MP_KEY_STATE_UP;
} else
return MP_INPUT_NOTHING;
} else {
MP_WARN(ctx, "Joystick warning unknown event type %d\n",ev.type);
return MP_INPUT_ERROR;
}
return MP_INPUT_NOTHING;
}
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