151 lines
4.3 KiB
C++
151 lines
4.3 KiB
C++
/*
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* Copyright (C) 2012 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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/*****************************************************************************
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**
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** Description: Implement operations that provide compatibility with NXP
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** PN544 controller. Specifically facilitate peer-to-peer
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** operations with PN544 controller.
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**
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*****************************************************************************/
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#include "OverrideLog.h"
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#include "Pn544Interop.h"
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#include "IntervalTimer.h"
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#include "Mutex.h"
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#include "NfcTag.h"
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namespace android
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{
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extern void startStopPolling (bool isStartPolling);
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}
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/*****************************************************************************
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**
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** private variables and functions
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**
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*****************************************************************************/
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static const int gIntervalTime = 1000; //millisecond between the check to restore polling
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static IntervalTimer gTimer;
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static Mutex gMutex;
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static void pn544InteropStartPolling (union sigval); //callback function for interval timer
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static bool gIsBusy = false; //is timer busy?
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static bool gAbortNow = false; //stop timer during next callback
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/*******************************************************************************
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**
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** Function: pn544InteropStopPolling
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**
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** Description: Stop polling to let NXP PN544 controller poll.
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** PN544 should activate in P2P mode.
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**
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** Returns: None
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**
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*******************************************************************************/
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void pn544InteropStopPolling ()
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{
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ALOGD ("%s: enter", __FUNCTION__);
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gMutex.lock ();
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gTimer.kill ();
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android::startStopPolling (false);
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gIsBusy = true;
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gAbortNow = false;
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gTimer.set (gIntervalTime, pn544InteropStartPolling); //after some time, start polling again
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gMutex.unlock ();
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ALOGD ("%s: exit", __FUNCTION__);
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}
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/*******************************************************************************
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**
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** Function: pn544InteropStartPolling
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**
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** Description: Start polling when activation state is idle.
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** sigval: Unused.
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**
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** Returns: None
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**
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*******************************************************************************/
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void pn544InteropStartPolling (union sigval)
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{
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ALOGD ("%s: enter", __FUNCTION__);
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gMutex.lock ();
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NfcTag::ActivationState state = NfcTag::getInstance ().getActivationState ();
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if (gAbortNow)
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{
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ALOGD ("%s: abort now", __FUNCTION__);
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gIsBusy = false;
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goto TheEnd;
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}
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if (state == NfcTag::Idle)
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{
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ALOGD ("%s: start polling", __FUNCTION__);
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android::startStopPolling (true);
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gIsBusy = false;
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}
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else
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{
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ALOGD ("%s: try again later", __FUNCTION__);
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gTimer.set (gIntervalTime, pn544InteropStartPolling); //after some time, start polling again
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}
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TheEnd:
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gMutex.unlock ();
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ALOGD ("%s: exit", __FUNCTION__);
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}
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/*******************************************************************************
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**
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** Function: pn544InteropIsBusy
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**
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** Description: Is the code performing operations?
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**
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** Returns: True if the code is busy.
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**
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*******************************************************************************/
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bool pn544InteropIsBusy ()
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{
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bool isBusy = false;
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gMutex.lock ();
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isBusy = gIsBusy;
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gMutex.unlock ();
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ALOGD ("%s: %u", __FUNCTION__, isBusy);
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return isBusy;
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}
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/*******************************************************************************
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**
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** Function: pn544InteropAbortNow
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**
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** Description: Request to abort all operations.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void pn544InteropAbortNow ()
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{
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ALOGD ("%s", __FUNCTION__);
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gMutex.lock ();
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gAbortNow = true;
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gMutex.unlock ();
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}
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