summaryrefslogtreecommitdiffstats
path: root/input/joystick.c
blob: c915d4bef65e4614f870539ada0361d01a024164 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
 * 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;
}