This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_syshaptic.c
282 lines (229 loc) · 5.97 KB
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
/*
SDL - Simple DirectMedia Layer
Copyright (C) 2008 Edgar Simo
This library 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 library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifdef SDL_JOYSTICK_LINUX
#include "SDL_haptic.h"
#include "../SDL_haptic_c.h"
#include "../SDL_syshaptic.h"
#include <unistd.h> /* close */
#include <linux/input.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/limits.h>
#include <string.h>
#define MAX_HAPTICS 32
43
44
45
/*
* List of available haptic devices.
*/
46
47
48
49
50
51
static struct
{
char *fname;
SDL_Haptic *haptic;
} SDL_hapticlist[MAX_HAPTICS];
52
53
54
55
/*
* Haptic system hardware data.
*/
56
57
58
59
60
61
struct haptic_hwdata
{
int fd;
};
62
63
64
65
66
67
68
69
70
/*
* Haptic system effect data.
*/
struct haptic_hweffect
{
int id;
};
71
72
73
74
75
#define test_bit(nr, addr) \
(((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0)
#define EV_TEST(ev,f) \
if (test_bit((ev), features)) ret |= (f);
76
77
78
79
/*
* Test whether a device has haptic properties.
* Returns available properties or 0 if there are none.
*/
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
static int
EV_IsHaptic(int fd)
{
unsigned int ret;
unsigned long features[1 + FF_MAX/sizeof(unsigned long)];
ret = 0;
ioctl(fd, EVIOCGBIT(EV_FF, sizeof(unsigned long) * 4), features);
EV_TEST(FF_CONSTANT, SDL_HAPTIC_CONSTANT);
EV_TEST(FF_PERIODIC, SDL_HAPTIC_PERIODIC);
EV_TEST(FF_RAMP, SDL_HAPTIC_RAMP);
EV_TEST(FF_SPRING, SDL_HAPTIC_SPRING);
EV_TEST(FF_FRICTION, SDL_HAPTIC_FRICTION);
EV_TEST(FF_DAMPER, SDL_HAPTIC_DAMPER);
EV_TEST(FF_RUMBLE, SDL_HAPTIC_RUMBLE);
EV_TEST(FF_INERTIA, SDL_HAPTIC_INERTIA);
EV_TEST(FF_GAIN, SDL_HAPTIC_GAIN);
EV_TEST(FF_AUTOCENTER, SDL_HAPTIC_AUTOCENTER);
return ret;
}
int
SDL_SYS_HapticInit(void)
{
const char joydev_pattern[] = "/dev/input/event%d";
dev_t dev_nums[MAX_HAPTICS];
char path[PATH_MAX];
struct stat sb;
int fd;
int i, j, k;
int duplicate;
int numhaptics;
numhaptics = 0;
i = 0;
for (j = 0; j < MAX_HAPTICS; ++j) {
snprintf(path, PATH_MAX, joydev_pattern, i++);
/* check to see if file exists */
if (stat(path,&sb) != 0)
break;
/* check for duplicates */
duplicate = 0;
for (k = 0; (k < numhaptics) && !duplicate; ++k) {
if (sb.st_rdev == dev_nums[k]) {
duplicate = 1;
}
}
if (duplicate) {
continue;
}
/* try to open */
fd = open(path, O_RDWR, 0);
if (fd < 0) continue;
#ifdef DEBUG_INPUT_EVENTS
printf("Checking %s\n", path);
#endif
/* see if it works */
if (EV_IsHaptic(fd)!=0) {
SDL_hapticlist[numhaptics].fname = SDL_strdup(path);
SDL_hapticlist[numhaptics].haptic = NULL;
dev_nums[numhaptics] = sb.st_rdev;
++numhaptics;
}
close(fd);
}
return numhaptics;
}
160
161
162
/*
* Return the name of a haptic device, does not need to be opened.
*/
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
const char *
SDL_SYS_HapticName(int index)
{
int fd;
static char namebuf[128];
char *name;
name = NULL;
fd = open(SDL_hapticlist[index].fname, O_RDONLY, 0);
if (fd >= 0) {
if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) {
name = SDL_hapticlist[index].fname;
}
else {
name = namebuf;
}
}
close(fd);
return name;
}
186
187
188
/*
* Opens a haptic device for usage.
*/
189
190
191
int
SDL_SYS_HapticOpen(SDL_Haptic * haptic)
{
192
int i;
193
194
int fd;
195
/* Open the character device */
196
197
198
fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0);
if (fd < 0) {
SDL_SetError("Unable to open %s\n", SDL_hapticlist[haptic->index]);
199
return -1;
200
201
}
202
203
/* Allocate the hwdata */
haptic->hwdata = (struct haptic_hwdata *)
204
SDL_malloc(sizeof(*haptic->hwdata));
205
206
if (haptic->hwdata == NULL) {
SDL_OutOfMemory();
207
goto open_err;
208
209
210
211
}
SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata));
/* Set the hwdata */
haptic->hwdata->fd = fd;
212
213
214
215
216
217
218
219
220
221
222
223
224
/* Set the effects */
if (ioctl(fd, EVIOCGEFFECTS, &haptic->neffects) < 0) {
SDL_SetError("Unable to query haptic device memory.");
goto open_err;
}
haptic->effects = (struct haptic_effect *)
SDL_malloc(sizeof(struct haptic_effect) * haptic->neffects);
if (haptic->effects == NULL) {
SDL_OutOfMemory();
goto open_err;
}
225
return 0;
226
227
228
229
230
231
232
233
234
/* Error handling */
open_err:
close(fd);
if (haptic->hwdata != NULL) {
free(haptic->hwdata);
haptic->hwdata = NULL;
}
return -1;
235
236
237
}
238
239
240
241
242
243
/*
* Closes the haptic device.
*/
void
SDL_SYS_HapticClose(SDL_Haptic * haptic)
{
244
245
246
247
248
249
250
251
if (haptic->hwdata) {
/* Clean up */
close(haptic->hwdata->fd);
/* Free */
SDL_free(haptic->hwdata);
haptic->hwdata = NULL;
252
253
SDL_free(haptic->effects);
haptic->neffects = 0;
254
}
255
256
257
}
258
259
260
/*
* Clean up after system specific haptic stuff
*/
261
262
263
264
265
266
267
268
269
270
271
void
SDL_SYS_HapticQuit(void)
{
int i;
for (i=0; SDL_hapticlist[i].fname != NULL; i++) {
SDL_free(SDL_hapticlist[i].fname);
}
SDL_hapticlist[0].fname = NULL;
}
272
273
274
275
276
277
278
279
280
/*
* Creates a new haptic effect.
*/
int
SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
{
return -1;
}
281
282
#endif /* SDL_HAPTIC_LINUX */