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 "LearnedCapacityBackupRestore.h"
18
19 namespace device {
20 namespace google {
21 namespace wahoo {
22 namespace health {
23
24 static constexpr char kChgFullFile[] = "sys/class/power_supply/bms/charge_full";
25 static constexpr char kSysCFPersistFile[] = "/persist/battery/qcom_charge_full";
26 static constexpr int kBuffSize = 256;
27
LearnedCapacityBackupRestore()28 LearnedCapacityBackupRestore::LearnedCapacityBackupRestore() : sw_cap_(0), hw_cap_(0) {}
29
Restore()30 void LearnedCapacityBackupRestore::Restore() {
31 ReadFromStorage();
32 ReadFromSRAM();
33 if (sw_cap_ == 0) {
34 // First backup
35 sw_cap_ = hw_cap_;
36 SaveToStorage();
37 } else {
38 // Always restore backup value
39 SaveToSRAM();
40 }
41 }
42
Backup()43 void LearnedCapacityBackupRestore::Backup() {
44 ReadFromSRAM();
45 if (sw_cap_ != hw_cap_) {
46 // Always backup the new FG computed learned capacity
47 sw_cap_ = hw_cap_;
48 SaveToStorage();
49 }
50 }
51
ReadFromStorage()52 void LearnedCapacityBackupRestore::ReadFromStorage() {
53 std::string buffer;
54
55 if (!android::base::ReadFileToString(std::string(kSysCFPersistFile), &buffer)) {
56 LOG(ERROR) << "Cannot read the storage file";
57 return;
58 }
59
60 if (sscanf(buffer.c_str(), "%d", &sw_cap_) < 1)
61 LOG(ERROR) << "data format is wrong in the storage file: " << buffer;
62 else
63 LOG(INFO) << "Storage data: " << buffer;
64 }
65
SaveToStorage()66 void LearnedCapacityBackupRestore::SaveToStorage() {
67 char strData[kBuffSize];
68
69 snprintf(strData, kBuffSize, "%d", sw_cap_);
70
71 LOG(INFO) << "Save to Storage: " << strData;
72
73 if (!android::base::WriteStringToFile(strData, std::string(kSysCFPersistFile)))
74 LOG(ERROR) << "Write file error: " << strerror(errno);
75 }
76
ReadFromSRAM()77 void LearnedCapacityBackupRestore::ReadFromSRAM() {
78 std::string buffer;
79
80 if (!android::base::ReadFileToString(std::string(kChgFullFile), &buffer)) {
81 LOG(ERROR) << "Read cycle counter error: " << strerror(errno);
82 return;
83 }
84
85 buffer = android::base::Trim(buffer);
86
87 if (sscanf(buffer.c_str(), "%d", &hw_cap_) < 1)
88 LOG(ERROR) << "Failed to parse SRAM bins: " << buffer;
89 else
90 LOG(INFO) << "SRAM data: " << buffer;
91 }
92
SaveToSRAM()93 void LearnedCapacityBackupRestore::SaveToSRAM() {
94 char strData[kBuffSize];
95
96 snprintf(strData, kBuffSize, "%d", hw_cap_);
97
98 LOG(INFO) << "Save to SRAM: " << strData;
99
100 if (!android::base::WriteStringToFile(strData, std::string(kChgFullFile)))
101 LOG(ERROR) << "Write data error: " << strerror(errno);
102 }
103
104 } // namespace health
105 } // namespace wahoo
106 } // namespace google
107 } // namespace device
108