1 /*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "virtual_device.h"
17
18 #include <iostream>
19 #include <map>
20
21 #include <unistd.h>
22
23 #include "devicestatus_define.h"
24 #include "fi_log.h"
25
26 #undef LOG_TAG
27 #define LOG_TAG "VirtualDevice"
28
29 namespace OHOS {
30 namespace Msdp {
31 namespace DeviceStatus {
32 namespace {
33 constexpr size_t DEFAULT_BUF_SIZE { 1024 };
34 constexpr int32_t MINIMUM_INTERVAL_ALLOWED { 1 };
35 constexpr int32_t MAXIMUM_INTERVAL_ALLOWED { 100 };
36 } // namespace
37
VirtualDevice(const std::string & node)38 VirtualDevice::VirtualDevice(const std::string &node)
39 {
40 inputDev_ = std::make_unique<VInputDevice>(node);
41 inputDev_->Open();
42 }
43
FindDeviceNode(const std::string & name,std::string & node)44 bool VirtualDevice::FindDeviceNode(const std::string &name, std::string &node)
45 {
46 CALL_DEBUG_ENTER;
47 std::map<std::string, std::string> nodes;
48 GetInputDeviceNodes(nodes);
49 FI_HILOGD("There are %{public}zu device nodes", nodes.size());
50
51 std::map<std::string, std::string>::const_iterator cItr = nodes.find(name);
52 if (cItr == nodes.cend()) {
53 FI_HILOGE("No virtual stylus were found");
54 return false;
55 }
56 FI_HILOGD("Node name : \'%{public}s\'", cItr->second.c_str());
57 std::ostringstream ss;
58 ss << "/dev/input/" << cItr->second;
59 node = ss.str();
60 return true;
61 }
62
Execute(std::vector<std::string> & results)63 void VirtualDevice::Execute(std::vector<std::string> &results)
64 {
65 CALL_DEBUG_ENTER;
66 char buffer[DEFAULT_BUF_SIZE] {};
67 FILE *pin = popen("cat /proc/bus/input/devices", "r");
68 if (pin == nullptr) {
69 FI_HILOGE("Failed to popen command");
70 return;
71 }
72 while (!feof(pin)) {
73 if (fgets(buffer, sizeof(buffer), pin) != nullptr) {
74 results.push_back(buffer);
75 }
76 }
77 FI_HILOGD("Close phandle");
78 pclose(pin);
79 }
80
GetInputDeviceNodes(std::map<std::string,std::string> & nodes)81 void VirtualDevice::GetInputDeviceNodes(std::map<std::string, std::string> &nodes)
82 {
83 CALL_DEBUG_ENTER;
84 std::vector<std::string> results;
85 Execute(results);
86 if (results.empty()) {
87 FI_HILOGE("Failed to list devices");
88 return;
89 }
90 const std::string kname { "Name=\"" };
91 const std::string kevent { "event" };
92 std::string name;
93 for (const auto &res : results) {
94 FI_HILOGD("res:%{public}s", res.c_str());
95 if (res[0] == 'N') {
96 std::string::size_type spos = res.find(kname);
97 if (spos != std::string::npos) {
98 spos += kname.size();
99 std::string::size_type tpos = res.find("\"", spos);
100 if (tpos != std::string::npos) {
101 name = res.substr(spos, tpos - spos);
102 }
103 }
104 } else if (!name.empty() && (res[0] == 'H')) {
105 std::string::size_type spos = res.find(kevent);
106 if (spos != std::string::npos) {
107 std::map<std::string, std::string>::const_iterator cItr = nodes.find(name);
108 if (cItr != nodes.end()) {
109 nodes.erase(cItr);
110 }
111 std::string::size_type tpos = spos + kevent.size();
112 while (std::isalnum(res[tpos])) {
113 ++tpos;
114 }
115 auto [_, ret] = nodes.emplace(name, res.substr(spos, tpos - spos));
116 if (!ret) {
117 FI_HILOGW("name is duplicated");
118 }
119 name.clear();
120 }
121 }
122 }
123 }
124
SendEvent(uint16_t type,uint16_t code,int32_t value)125 int32_t VirtualDevice::SendEvent(uint16_t type, uint16_t code, int32_t value)
126 {
127 CALL_DEBUG_ENTER;
128 CHKPR(inputDev_, RET_ERR);
129 inputDev_->SendEvent(type, code, value);
130
131 if ((type == EV_SYN) && (code == SYN_REPORT)) {
132 std::this_thread::sleep_for(std::chrono::milliseconds(minimumInterval_));
133 }
134 return RET_OK;
135 }
136
GetName() const137 std::string VirtualDevice::GetName() const
138 {
139 if (!name_.empty()) {
140 return name_;
141 }
142 if (inputDev_ != nullptr) {
143 return inputDev_->GetName();
144 }
145 return {};
146 }
147
SetMinimumInterval(int32_t interval)148 void VirtualDevice::SetMinimumInterval(int32_t interval)
149 {
150 minimumInterval_ = std::max(MINIMUM_INTERVAL_ALLOWED, std::min(interval, MAXIMUM_INTERVAL_ALLOWED));
151 }
152 } // namespace DeviceStatus
153 } // namespace Msdp
154 } // namespace OHOS