1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /*****************************************************************************
18 **
19 ** Description: Implement operations that provide compatibility with NXP
20 ** PN544 controller. Specifically facilitate peer-to-peer
21 ** operations with PN544 controller.
22 **
23 *****************************************************************************/
24 #include "Pn544Interop.h"
25 #include "IntervalTimer.h"
26 #include "Mutex.h"
27 #include "NfcTag.h"
28
29 #include <android-base/stringprintf.h>
30 #include <base/logging.h>
31
32 using android::base::StringPrintf;
33
34 extern bool nfc_debug_enabled;
35
36 namespace android {
37 extern void startStopPolling(bool isStartPolling);
38 }
39
40 /*****************************************************************************
41 **
42 ** private variables and functions
43 **
44 *****************************************************************************/
45
46 static const int gIntervalTime =
47 1000; // millisecond between the check to restore polling
48 static IntervalTimer gTimer;
49 static Mutex gMutex;
50 static void pn544InteropStartPolling(
51 union sigval); // callback function for interval timer
52 static bool gIsBusy = false; // is timer busy?
53 static bool gAbortNow = false; // stop timer during next callback
54
55 /*******************************************************************************
56 **
57 ** Function: pn544InteropStopPolling
58 **
59 ** Description: Stop polling to let NXP PN544 controller poll.
60 ** PN544 should activate in P2P mode.
61 **
62 ** Returns: None
63 **
64 *******************************************************************************/
pn544InteropStopPolling()65 void pn544InteropStopPolling() {
66 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: enter", __func__);
67 gMutex.lock();
68 gTimer.kill();
69 android::startStopPolling(false);
70 gIsBusy = true;
71 gAbortNow = false;
72 gTimer.set(gIntervalTime,
73 pn544InteropStartPolling); // after some time, start polling again
74 gMutex.unlock();
75 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: exit", __func__);
76 }
77
78 /*******************************************************************************
79 **
80 ** Function: pn544InteropStartPolling
81 **
82 ** Description: Start polling when activation state is idle.
83 ** sigval: Unused.
84 **
85 ** Returns: None
86 **
87 *******************************************************************************/
pn544InteropStartPolling(union sigval)88 void pn544InteropStartPolling(union sigval) {
89 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: enter", __func__);
90 gMutex.lock();
91 NfcTag::ActivationState state = NfcTag::getInstance().getActivationState();
92
93 if (gAbortNow) {
94 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: abort now", __func__);
95 gIsBusy = false;
96 goto TheEnd;
97 }
98
99 if (state == NfcTag::Idle) {
100 DLOG_IF(INFO, nfc_debug_enabled)
101 << StringPrintf("%s: start polling", __func__);
102 android::startStopPolling(true);
103 gIsBusy = false;
104 } else {
105 DLOG_IF(INFO, nfc_debug_enabled)
106 << StringPrintf("%s: try again later", __func__);
107 gTimer.set(
108 gIntervalTime,
109 pn544InteropStartPolling); // after some time, start polling again
110 }
111
112 TheEnd:
113 gMutex.unlock();
114 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: exit", __func__);
115 }
116
117 /*******************************************************************************
118 **
119 ** Function: pn544InteropIsBusy
120 **
121 ** Description: Is the code performing operations?
122 **
123 ** Returns: True if the code is busy.
124 **
125 *******************************************************************************/
pn544InteropIsBusy()126 bool pn544InteropIsBusy() {
127 bool isBusy = false;
128 gMutex.lock();
129 isBusy = gIsBusy;
130 gMutex.unlock();
131 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: %u", __func__, isBusy);
132 return isBusy;
133 }
134
135 /*******************************************************************************
136 **
137 ** Function: pn544InteropAbortNow
138 **
139 ** Description: Request to abort all operations.
140 **
141 ** Returns: None.
142 **
143 *******************************************************************************/
pn544InteropAbortNow()144 void pn544InteropAbortNow() {
145 DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s", __func__);
146 gMutex.lock();
147 gAbortNow = true;
148 gMutex.unlock();
149 }
150