6c92951047
Move the common_time service developed in the ics-aah branch back into master. The common_time service is a small service build to synchronize an arbitrary timeline amongst peers on a local sub-net. While running and configured, the service will elect a master from the set of available devices within the subnet, define a relationship between the common_time timeline the local time timeline (provided by the local time HAL), and then attempt to maintain synchronization between common and local time by controlling the frequency of the local time clock via the HAL, or by disciplining local time in the digital domain if the local time HAL implementation does not support HW slewing. On its own, the native common time service will do nothing until it is configured. The CommonTimeManagementService (running out of the system server process) is responsible for implementing policy regarding configuration and operation of the common_time service and will be added in a subsequent CL. Change-Id: I71292f9b9b1797665865689c4572c9d3a0552f64 Signed-off-by: John Grossman <johngro@google.com>
93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
/*
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* Copyright (C) 2011 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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#define LOG_TAG "common_time"
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#include <utils/Log.h>
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#include <assert.h>
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#include <stdint.h>
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#include <common_time/local_clock.h>
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#include <hardware/hardware.h>
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#include <hardware/local_time_hal.h>
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#include <utils/Errors.h>
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#include <utils/threads.h>
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namespace android {
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Mutex LocalClock::dev_lock_;
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local_time_hw_device_t* LocalClock::dev_ = NULL;
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LocalClock::LocalClock() {
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int res;
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const hw_module_t* mod;
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AutoMutex lock(&dev_lock_);
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if (dev_ != NULL)
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return;
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res = hw_get_module_by_class(LOCAL_TIME_HARDWARE_MODULE_ID, NULL, &mod);
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if (res) {
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ALOGE("Failed to open local time HAL module (res = %d)", res);
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} else {
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res = local_time_hw_device_open(mod, &dev_);
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if (res) {
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ALOGE("Failed to open local time HAL device (res = %d)", res);
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dev_ = NULL;
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}
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}
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}
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bool LocalClock::initCheck() {
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return (NULL != dev_);
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}
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int64_t LocalClock::getLocalTime() {
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assert(NULL != dev_);
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assert(NULL != dev_->get_local_time);
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return dev_->get_local_time(dev_);
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}
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uint64_t LocalClock::getLocalFreq() {
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assert(NULL != dev_);
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assert(NULL != dev_->get_local_freq);
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return dev_->get_local_freq(dev_);
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}
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status_t LocalClock::setLocalSlew(int16_t rate) {
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assert(NULL != dev_);
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if (!dev_->set_local_slew)
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return INVALID_OPERATION;
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return static_cast<status_t>(dev_->set_local_slew(dev_, rate));
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}
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int32_t LocalClock::getDebugLog(struct local_time_debug_event* records,
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int max_records) {
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assert(NULL != dev_);
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if (!dev_->get_debug_log)
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return INVALID_OPERATION;
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return dev_->get_debug_log(dev_, records, max_records);
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}
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} // namespace android
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