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Diffstat (limited to 'vibrator/1.0-lineage/Vibrator.cpp')
-rw-r--r-- | vibrator/1.0-lineage/Vibrator.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/vibrator/1.0-lineage/Vibrator.cpp b/vibrator/1.0-lineage/Vibrator.cpp new file mode 100644 index 0000000..50ca82e --- /dev/null +++ b/vibrator/1.0-lineage/Vibrator.cpp @@ -0,0 +1,162 @@ +/* + * 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 |