1 /*
2 * Copyright (C) 2018 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 #include "CycleCountBackupRestore.h"
18
19 namespace device {
20 namespace google {
21 namespace wahoo {
22 namespace health {
23
24 static constexpr char kCycCntFile[] = "sys/class/power_supply/bms/device/cycle_counts_bins";
25 static constexpr char kSysPersistFile[] = "/persist/battery/qcom_cycle_counts_bins";
26 static constexpr int kBuffSize = 256;
27
CycleCountBackupRestore()28 CycleCountBackupRestore::CycleCountBackupRestore() { }
29
Restore()30 void CycleCountBackupRestore::Restore()
31 {
32 ReadFromStorage();
33 ReadFromSRAM();
34 UpdateAndSave();
35 }
36
Backup()37 void CycleCountBackupRestore::Backup()
38 {
39 ReadFromSRAM();
40 UpdateAndSave();
41 }
42
ReadFromStorage()43 void CycleCountBackupRestore::ReadFromStorage()
44 {
45 std::string buffer;
46
47 if (!android::base::ReadFileToString(std::string(kSysPersistFile), &buffer)) {
48 LOG(ERROR) << "Cannot read the storage file";
49 return;
50 }
51
52 if (sscanf(buffer.c_str(), "%d %d %d %d %d %d %d %d",
53 &sw_bins_[0], &sw_bins_[1], &sw_bins_[2], &sw_bins_[3],
54 &sw_bins_[4], &sw_bins_[5], &sw_bins_[6], &sw_bins_[7])
55 != kBucketCount)
56 LOG(ERROR) << "data format is wrong in the storage file: " << buffer;
57 else
58 LOG(INFO) << "Storage data: " << buffer;
59 }
60
SaveToStorage()61 void CycleCountBackupRestore::SaveToStorage()
62 {
63 char strData[kBuffSize];
64
65 snprintf(strData, kBuffSize, "%d %d %d %d %d %d %d %d",
66 sw_bins_[0], sw_bins_[1], sw_bins_[2], sw_bins_[3],
67 sw_bins_[4], sw_bins_[5], sw_bins_[6], sw_bins_[7]);
68
69 LOG(INFO) << "Save to Storage: " << strData;
70
71 if (!android::base::WriteStringToFile(strData, std::string(kSysPersistFile)))
72 LOG(ERROR) << "Write file error: " << strerror(errno);
73 }
74
ReadFromSRAM()75 void CycleCountBackupRestore::ReadFromSRAM()
76 {
77 std::string buffer;
78
79 if (!android::base::ReadFileToString(std::string(kCycCntFile), &buffer)) {
80 LOG(ERROR) << "Read cycle counter error: " << strerror(errno);
81 return;
82 }
83
84 buffer = android::base::Trim(buffer);
85
86 if (sscanf(buffer.c_str(), "%d %d %d %d %d %d %d %d",
87 &hw_bins_[0], &hw_bins_[1], &hw_bins_[2], &hw_bins_[3],
88 &hw_bins_[4], &hw_bins_[5], &hw_bins_[6], &hw_bins_[7])
89 != kBucketCount)
90 LOG(ERROR) << "Failed to parse SRAM bins: " << buffer;
91 else
92 LOG(INFO) << "SRAM data: " << buffer;
93 }
94
SaveToSRAM()95 void CycleCountBackupRestore::SaveToSRAM()
96 {
97 char strData[kBuffSize];
98
99 snprintf(strData, kBuffSize, "%d %d %d %d %d %d %d %d",
100 hw_bins_[0], hw_bins_[1], hw_bins_[2], hw_bins_[3],
101 hw_bins_[4], hw_bins_[5], hw_bins_[6], hw_bins_[7]);
102
103 LOG(INFO) << "Save to SRAM: " << strData ;
104
105 if (!android::base::WriteStringToFile(strData, std::string(kCycCntFile)))
106 LOG(ERROR) << "Write data error: " << strerror(errno);
107 }
108
109
UpdateAndSave()110 void CycleCountBackupRestore::UpdateAndSave()
111 {
112 bool backup = false;
113 bool restore = false;
114 for (int i = 0; i < kBucketCount; i++) {
115 if (hw_bins_[i] < sw_bins_[i]) {
116 hw_bins_[i] = sw_bins_[i];
117 restore = true;
118 } else if (hw_bins_[i] > sw_bins_[i]) {
119 sw_bins_[i] = hw_bins_[i];
120 backup = true;
121 }
122 }
123 if (restore)
124 SaveToSRAM();
125 if (backup)
126 SaveToStorage();
127 }
128
129 } // namespace health
130 } // namespace wahoo
131 } // namespace google
132 } // namespace device
133