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Add force feedback.

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This commit is contained in:
Themaister 2013-09-25 22:40:34 +02:00
parent b916c5ace1
commit 89fff9d790
1 changed files with 94 additions and 2 deletions
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96
input/udev_joypad.c
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@ -26,7 +26,7 @@
#include <fcntl.h>
#include <libudev.h>
#include <linux/types.h>
#include <linux/joystick.h>
#include <linux/input.h>
// Udev/evdev Linux joypad driver.
// More complex and extremely low level,
@ -54,6 +54,10 @@ struct udev_joypad
uint8_t axes_bind[ABS_MAX];
struct input_absinfo absinfo[NUM_AXES];
int num_effects;
int effects[2]; // [0] - strong, [1] - weak
bool support_ff[2];
char *ident;
char *path;
};
@ -173,6 +177,27 @@ end:
udev_device_unref(dev);
}
static void udev_set_rumble(unsigned i, unsigned effect, bool state)
{
struct udev_joypad *pad = &g_pads[i];
if (pad->fd < 0)
return;
if (!pad->support_ff[effect])
return;
struct input_event play;
memset(&play, 0, sizeof(play));
play.type = EV_FF;
play.code = pad->effects[effect];
play.value = state;
if (write(pad->fd, &play, sizeof(play)) < (ssize_t)sizeof(play))
{
RARCH_ERR("[udev]: Failed to set rumble effect %u on pad %u.\n",
effect, i);
}
}
static void udev_joypad_poll(void)
{
while (hotplug_available())
@ -180,6 +205,19 @@ static void udev_joypad_poll(void)
for (unsigned i = 0; i < MAX_PLAYERS; i++)
poll_pad(i);
#if 0 // Debug rumble.
static bool old_0;
static bool old_1;
bool new_0 = g_pads[0].buttons[0];
bool new_1 = g_pads[0].buttons[1];
if (new_0 != old_0)
udev_set_rumble(0, 0, new_0);
if (new_1 != old_1)
udev_set_rumble(0, 1, new_1);
old_0 = new_0;
old_1 = new_1;
#endif
}
#define test_bit(nr, addr) \
@ -188,7 +226,7 @@ static void udev_joypad_poll(void)
static int open_joystick(const char *path)
{
int fd = open(path, O_RDONLY | O_NONBLOCK);
int fd = open(path, O_RDWR | O_NONBLOCK);
if (fd < 0)
return fd;
@ -223,7 +261,12 @@ static int find_vacant_pad(void)
static void free_pad(unsigned pad)
{
if (g_pads[pad].fd >= 0)
{
udev_set_rumble(pad, 0, false);
udev_set_rumble(pad, 1, false);
close(g_pads[pad].fd);
}
free(g_pads[pad].path);
memset(&g_pads[pad], 0, sizeof(g_pads[pad]));
g_pads[pad].fd = -1;
@ -288,6 +331,55 @@ static bool add_pad(unsigned i, int fd, const char *path)
if (*pad->ident)
input_config_autoconfigure_joypad(i, pad->ident, "udev");
// Check for rumble features.
unsigned long ffbit[NBITS(FF_MAX)] = {0};
if (ioctl(fd, EVIOCGBIT(EV_FF, sizeof(ffbit)), ffbit) >= 0)
{
if (test_bit(FF_RUMBLE, ffbit))
RARCH_LOG("[udev]: Pad #%u (%s) supports force feedback.\n",
i, path);
if (ioctl(fd, EVIOCGEFFECTS, &pad->num_effects) >= 0)
RARCH_LOG("[udev]: Pad #%u (%s) supports %d force feedback effects.\n", i, path, pad->num_effects);
if (pad->num_effects >= 2)
{
struct ff_effect effect;
// Strong rumble.
memset(&effect, 0, sizeof(effect));
effect.type = FF_RUMBLE;
effect.id = -1;
effect.u.rumble.strong_magnitude = 0x8000;
effect.u.rumble.weak_magnitude = 0;
effect.replay.length = 20000;
effect.replay.delay = 0;
pad->support_ff[0] = ioctl(fd, EVIOCSFF, &effect) == 0;
if (pad->support_ff[0])
{
RARCH_LOG("[udev]: Pad #%u (%s) supports \"strong\" rumble effect (id %d).\n",
i, path, effect.id);
pad->effects[0] = effect.id; // Gets updated by ioctl().
}
// Weak rumble.
memset(&effect, 0, sizeof(effect));
effect.type = FF_RUMBLE;
effect.id = -1;
effect.u.rumble.strong_magnitude = 0;
effect.u.rumble.weak_magnitude = 0xc000;
effect.replay.length = 20000;
effect.replay.delay = 0;
pad->support_ff[1] = ioctl(fd, EVIOCSFF, &effect) == 0;
if (pad->support_ff[1])
{
RARCH_LOG("[udev]: Pad #%u (%s) supports \"weak\" rumble effect (id %d).\n",
i, path, effect.id);
pad->effects[1] = effect.id; // Gets updated by ioctl().
}
}
}
return true;
}