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SDL_syshaptic.c
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/*
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
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/*
* List of available haptic devices.
*/
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static struct
{
char *fname;
SDL_Haptic *haptic;
} SDL_hapticlist[MAX_HAPTICS];
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/*
* Haptic system hardware data.
*/
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struct haptic_hwdata
{
int fd;
};
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/*
* Haptic system effect data.
*/
struct haptic_hweffect
{
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struct ff_effect effect;
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};
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#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);
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/*
* Test whether a device has haptic properties.
* Returns available properties or 0 if there are none.
*/
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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;
}
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/*
* Return the name of a haptic device, does not need to be opened.
*/
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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;
}
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/*
* Opens a haptic device for usage.
*/
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int
SDL_SYS_HapticOpen(SDL_Haptic * haptic)
{
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int i;
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int fd;
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/* Open the character device */
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fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0);
if (fd < 0) {
SDL_SetError("Unable to open %s\n", SDL_hapticlist[haptic->index]);
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return -1;
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}
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/* Allocate the hwdata */
haptic->hwdata = (struct haptic_hwdata *)
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SDL_malloc(sizeof(*haptic->hwdata));
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if (haptic->hwdata == NULL) {
SDL_OutOfMemory();
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goto open_err;
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}
SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata));
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/* Set the data */
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haptic->hwdata->fd = fd;
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haptic->supported = EV_IsHaptic(fd);
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/* 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;
}
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return 0;
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/* Error handling */
open_err:
close(fd);
if (haptic->hwdata != NULL) {
free(haptic->hwdata);
haptic->hwdata = NULL;
}
return -1;
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}
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/*
* Closes the haptic device.
*/
void
SDL_SYS_HapticClose(SDL_Haptic * haptic)
{
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if (haptic->hwdata) {
/* Clean up */
close(haptic->hwdata->fd);
/* Free */
SDL_free(haptic->hwdata);
haptic->hwdata = NULL;
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SDL_free(haptic->effects);
haptic->neffects = 0;
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}
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}
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/*
* Clean up after system specific haptic stuff
*/
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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;
}
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/*
* Initializes the linux effect struct from a haptic_effect.
*/
static int
SDL_SYS_ToFFEffect( struct ff_effect * dest, struct haptic_effect * src )
{
SDL_memset(dest, 0, sizeof(struct ff_effect));
switch (src->effect.type) {
case SDL_HAPTIC_CONSTANT:
dest->type = FF_CONSTANT;
break;
default:
SDL_SetError("Unknown haptic effect type.");
return -1;
}
return 0;
}
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/*
* Creates a new haptic effect.
*/
int
SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
{
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/* Allocate the hardware effect */
effect->hweffect = (struct haptic_hweffect *)
SDL_malloc(sizeof(struct haptic_hweffect));
if (effect->hweffect == NULL) {
SDL_OutOfMemory();
return -1;
}
/* Prepare the ff_effect */
if (SDL_SYS_ToFFEffect( &effect->hweffect->effect, effect ) != 0) {
return -1;
}
effect->hweffect->effect.id = -1; /* Have the kernel give it an id */
/* Upload the effect */
if (ioctl(haptic->hwdata->fd, EVIOCSFF, &effect->hweffect->effect) < 0) {
SDL_SetError("Error uploading effect to the haptic device.");
return -1;
}
return 0;
}
/*
* Runs an effect.
*/
int
SDL_SYS_HapticRunEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
{
struct input_event run;
/* Prepare to run the effect */
run.type = EV_FF;
run.code = effect->hweffect->effect.id;
run.value = 1;
if (write(haptic->hwdata->fd, (const void*) &run, sizeof(run)) < 0) {
SDL_SetError("Unable to run the haptic effect.");
return -1;
}
return 0;
}
/*
* Frees the effect
*/
void
SDL_SYS_HapticDestroyEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
{
if (ioctl(haptic->hwdata->fd, EVIOCRMFF, effect->hweffect->effect.id) < 0) {
SDL_SetError("Error removing the effect from the haptic device.");
}
SDL_free(effect->hweffect);
effect->hweffect = NULL;
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}
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#endif /* SDL_HAPTIC_LINUX */