I asked this question in the DL a while ago and didn't get a reply (did get
some helpful pointers).
I finally have the code to do this. Adapted from
https://github.com/nemomobile/qt-mobility-haptics-ffmemlessChris Adams was also
kind enough to say this
#include <QCoreApplication>#include <QTimer>#include <QDebug>
#include <linux/input.h>#include <sys/types.h>#include <sys/stat.h>#include
<fcntl.h>
#define BITS_PER_LONG (sizeof(long) * 8)#define OFF(x)
((x)%BITS_PER_LONG)#define BIT(x) (1UL<<OFF(x))#define LONG(x)
((x)/BITS_PER_LONG)#define test_bit(bit, array) ((array[LONG(bit)] >>
OFF(bit)) & 1)
#define ACTUATOR_SPIN_UP 2#define ACTUATOR_SPIN_DOWN 4#define
ACTUATOR_RUMBLE_MIN 8191#define ACTUATOR_RUMBLE_MAX 32767#define
ACTUATOR_MAGNITUDE_MAX 16000#define ACTUATOR_MAGNITUDE_MEAN 12000#define
LONG_PRESS_DURATION 77#define LONG_PRESS_DELAY 4#define LONG_PRESS_MAX
16384#define LONG_PRESS_MIN 8191#define BUTTON_PRESS_DURATION 14#define
BUTTON_PRESS_DELAY 4#define BUTTON_PRESS_MAX 24576#define BUTTON_PRESS_MIN
20478#define KEYPAD_PRESS_DURATION 6#define KEYPAD_PRESS_DELAY 4#define
KEYPAD_PRESS_MAX 32767#define KEYPAD_PRESS_MIN 32767
int vibra_evdev_file_search(bool *supportsRumble, bool *supportsPeriodic){
int i = 0; int fp = 1; char device_file_name[24]; unsigned long
features[4];
/* fail safe stop at 256 devices */ while (fp && i < 256) {
sprintf(device_file_name, "/dev/input/event%d", i); fp =
open(device_file_name, O_RDWR); if (fp == -1) { qDebug() <<
"Unable to open input file"; break; }
if (ioctl(fp, EVIOCGBIT(EV_FF, sizeof(unsigned long) * 4), features) <
0) { qDebug() << "Ioctl query failed"; close(fp);
i++; continue; }
*supportsRumble = false; *supportsPeriodic = false; if
(test_bit(FF_RUMBLE, features)) *supportsRumble = true; if
(test_bit(FF_PERIODIC, features)) *supportsPeriodic = true;
if (*supportsRumble || *supportsPeriodic) return fp;
close(fp); i++; }
return -1;}
Q_DECL_EXPORT int main(int argc, char *argv[]){ QCoreApplication a(argc,
argv);
struct ff_effect m_themeEffect, m_customHapticEffect;
bool supportsRumble = false, supportsPeriodic = false; int
m_vibraSpiDevice = -1;
//Initialize effects m_themeEffect.type = FF_RUMBLE; m_themeEffect.id
= 1; m_themeEffect.u.rumble.strong_magnitude = KEYPAD_PRESS_MAX;
m_themeEffect.u.rumble.weak_magnitude = KEYPAD_PRESS_MIN;
m_themeEffect.replay.length = KEYPAD_PRESS_DURATION;
m_themeEffect.replay.delay = KEYPAD_PRESS_DELAY;
m_customHapticEffect.type = FF_RUMBLE; m_customHapticEffect.id = 2;
m_customHapticEffect.u.rumble.strong_magnitude = ACTUATOR_RUMBLE_MAX;
m_customHapticEffect.u.rumble.weak_magnitude = ACTUATOR_RUMBLE_MIN;
m_customHapticEffect.replay.length = 100 + ACTUATOR_SPIN_UP;
m_customHapticEffect.replay.delay = ACTUATOR_SPIN_DOWN;
m_vibraSpiDevice = vibra_evdev_file_search(&supportsRumble,
&supportsPeriodic);
qDebug() << "Supports Rumble: " << supportsRumble; qDebug() << "Supports
Periodic: " << supportsPeriodic;
struct input_event playEvent; playEvent.type = EV_FF; playEvent.code
= 1; playEvent.value = 1; { // Write effect and let the device
rumble int writeRetn = write(m_vibraSpiDevice, (const void*) &playEvent,
sizeof(playEvent)); if (writeRetn == -1) { qDebug() <<
"Unable to write event to effect"; } QEventLoop loop;
QTimer::singleShot(1000, &loop, SLOT(quit())); loop.exec(); }
close(m_vibraSpiDevice);
return 0;}
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