cf5df9cf40
This change implements direct report for accel, gyro and mag at normal and fast rate level. It supports ashmem shared memory. The direct report and traditional sensor subscription are still tangled up in this implementation. Bug: 30985702 Bug: 33588372 Test: tested via demo app Change-Id: Idc4f626dfe624558718c1b04f16898a0ea247e62
74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "directchannel.h"
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#include <cutils/ashmem.h>
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#include <sys/mman.h>
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namespace android {
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bool DirectChannelBase::isValid() {
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return mBuffer != nullptr;
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}
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int DirectChannelBase::getError() {
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return mError;
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}
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void DirectChannelBase::write(const sensors_event_t * ev) {
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if (isValid()) {
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mBuffer->write(ev, 1);
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}
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}
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AshmemDirectChannel::AshmemDirectChannel(const struct sensors_direct_mem_t *mem) : mAshmemFd(0) {
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mAshmemFd = mem->handle->data[0];
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if (!::ashmem_valid(mAshmemFd)) {
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mError = BAD_VALUE;
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return;
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}
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if ((size_t)::ashmem_get_size_region(mAshmemFd) != mem->size) {
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mError = BAD_VALUE;
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return;
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}
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mSize = mem->size;
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mBase = ::mmap(NULL, mem->size, PROT_WRITE, MAP_SHARED, mAshmemFd, 0);
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if (mBase == nullptr) {
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mError = NO_MEMORY;
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return;
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}
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mBuffer = std::unique_ptr<LockfreeBuffer>(new LockfreeBuffer(mBase, mSize));
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if (!mBuffer) {
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mError = NO_MEMORY;
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}
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}
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AshmemDirectChannel::~AshmemDirectChannel() {
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if (mBase) {
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mBuffer = nullptr;
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::munmap(mBase, mSize);
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}
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::close(mAshmemFd);
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}
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} // namespace android
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