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/*
* Copyright (C) 2017 The LineageOS Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "VibratorService"
#include <log/log.h>
#include "Vibrator.h"
#include <cmath>
#include <fstream>
namespace android {
namespace hardware {
namespace vibrator {
namespace V1_0 {
namespace implementation {
#define VIBRATOR "/sys/devices/virtual/timed_output/vibrator/"
#define ENABLE "enable"
#define VTG_LEVEL "vtg_level"
#define VTG_MIN "vtg_min"
#define VTG_MAX "vtg_max"
#define CLICK_TIMING_MS 20
#define DEFAULT_MIN_VTG 0
#define DEFAULT_MAX_VTG 255
static int get(std::string path, int defaultValue) {
int value = defaultValue;
std::ifstream file(path);
if (!file) {
ALOGE("Failed to open %s", path.c_str());
return value;
}
file >> value;
if (!file) {
ALOGE("Failed to read value from %s", path.c_str());
}
return value;
}
static int set(std::string path, int value) {
std::ofstream file(path);
if (!file) {
ALOGE("Failed to open %s", path.c_str());
return -1;
}
file << value;
if (!file) {
ALOGE("Failed to write %d to %s", value, path.c_str());
return -1;
}
return 0;
}
Vibrator::Vibrator() {
minVoltage = get(VIBRATOR VTG_MIN, DEFAULT_MIN_VTG);
maxVoltage = get(VIBRATOR VTG_MAX, DEFAULT_MAX_VTG);
}
Return<Status> Vibrator::on(uint32_t timeout_ms) {
if (set(VIBRATOR ENABLE, timeout_ms)) {
return Status::UNKNOWN_ERROR;
}
return Status::OK;
}
Return<Status> Vibrator::off() {
if (set(VIBRATOR ENABLE, 0)) {
return Status::UNKNOWN_ERROR;
}
return Status::OK;
}
Return<bool> Vibrator::supportsAmplitudeControl() {
return true;
}
Return<Status> Vibrator::setAmplitude(uint8_t amplitude) {
if (amplitude == 0) {
return Status::BAD_VALUE;
}
/*
* Scale the voltage such that an amplitude of 1 is minVoltage
* and an amplitude of 255 is maxVoltage.
*/
uint32_t voltage =
std::lround((amplitude - 1) / 254.0 * (maxVoltage - minVoltage) + minVoltage);
if (set(VIBRATOR VTG_LEVEL, voltage)) {
return Status::UNKNOWN_ERROR;
}
ALOGI("Voltage set to: %u", voltage);
return Status::OK;
}
Return<void> Vibrator::perform(Effect effect, EffectStrength strength, perform_cb _hidl_cb) {
switch (effect) {
case Effect::CLICK:
uint8_t amplitude;
switch (strength) {
case EffectStrength::LIGHT:
amplitude = 36;
break;
case EffectStrength::MEDIUM:
amplitude = 128;
break;
case EffectStrength::STRONG:
amplitude = 255;
break;
default:
_hidl_cb(Status::UNSUPPORTED_OPERATION, 0);
return Void();
}
on(CLICK_TIMING_MS);
setAmplitude(amplitude);
_hidl_cb(Status::OK, CLICK_TIMING_MS);
break;
default:
_hidl_cb(Status::UNSUPPORTED_OPERATION, 0);
break;
}
return Void();
}
} // namespace implementation
} // namespace V1_0
} // namespace vibrator
} // namespace hardware
} // namespace android
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