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 namespace OHOS {
27 namespace Msdp {
28 namespace DeviceStatus {
29 namespace {
30 constexpr ::OHOS::HiviewDFX::HiLogLabel LABEL { LOG_CORE, MSDP_DOMAIN_ID, "VirtualDevice" };
31 constexpr size_t DEFAULT_BUF_SIZE { 1024 };
32 constexpr int32_t MINIMUM_INTERVAL_ALLOWED { 1 };
33 constexpr int32_t MAXIMUM_INTERVAL_ALLOWED { 100 };
34 } // namespace
35
VirtualDevice(const std::string & node)36 VirtualDevice::VirtualDevice(const std::string &node)
37 {
38 inputDev_ = std::make_unique<VInputDevice>(node);
39 inputDev_->Open();
40 }
41
FindDeviceNode(const std::string & name,std::string & node)42 bool VirtualDevice::FindDeviceNode(const std::string &name, std::string &node)
43 {
44 CALL_DEBUG_ENTER;
45 std::map<std::string, std::string> nodes;
46 GetInputDeviceNodes(nodes);
47 FI_HILOGD("There are %{public}zu device nodes", nodes.size());
48
49 std::map<std::string, std::string>::const_iterator cItr = nodes.find(name);
50 if (cItr == nodes.cend()) {
51 FI_HILOGE("No virtual stylus were found");
52 return false;
53 }
54 FI_HILOGD("Node name : \'%{public}s\'", cItr->second.c_str());
55 std::ostringstream ss;
56 ss << "/dev/input/" << cItr->second;
57 node = ss.str();
58 return true;
59 }
60
Execute(std::vector<std::string> & results)61 void VirtualDevice::Execute(std::vector<std::string> &results)
62 {
63 CALL_DEBUG_ENTER;
64 char buffer[DEFAULT_BUF_SIZE] {};
65 FILE *pin = popen("cat /proc/bus/input/devices", "r");
66 if (pin == nullptr) {
67 FI_HILOGE("Failed to popen command");
68 return;
69 }
70 while (!feof(pin)) {
71 if (fgets(buffer, sizeof(buffer), pin) != nullptr) {
72 results.push_back(buffer);
73 }
74 }
75 FI_HILOGD("Close phandle");
76 pclose(pin);
77 }
78
GetInputDeviceNodes(std::map<std::string,std::string> & nodes)79 void VirtualDevice::GetInputDeviceNodes(std::map<std::string, std::string> &nodes)
80 {
81 CALL_DEBUG_ENTER;
82 std::vector<std::string> results;
83 Execute(results);
84 if (results.empty()) {
85 FI_HILOGE("Failed to list devices");
86 return;
87 }
88 const std::string kname { "Name=\"" };
89 const std::string kevent { "event" };
90 std::string name;
91 for (const auto &res : results) {
92 FI_HILOGD("res:%{public}s", res.c_str());
93 if (res[0] == 'N') {
94 std::string::size_type spos = res.find(kname);
95 if (spos != std::string::npos) {
96 spos += kname.size();
97 std::string::size_type tpos = res.find("\"", spos);
98 if (tpos != std::string::npos) {
99 name = res.substr(spos, tpos - spos);
100 }
101 }
102 } else if (!name.empty() && (res[0] == 'H')) {
103 std::string::size_type spos = res.find(kevent);
104 if (spos != std::string::npos) {
105 std::map<std::string, std::string>::const_iterator cItr = nodes.find(name);
106 if (cItr != nodes.end()) {
107 nodes.erase(cItr);
108 }
109 std::string::size_type tpos = spos + kevent.size();
110 while (std::isalnum(res[tpos])) {
111 ++tpos;
112 }
113 auto [_, ret] = nodes.emplace(name, res.substr(spos, tpos - spos));
114 if (!ret) {
115 FI_HILOGW("name is duplicated");
116 }
117 name.clear();
118 }
119 }
120 }
121 }
122
SendEvent(uint16_t type,uint16_t code,int32_t value)123 int32_t VirtualDevice::SendEvent(uint16_t type, uint16_t code, int32_t value)
124 {
125 CALL_DEBUG_ENTER;
126 CHKPR(inputDev_, RET_ERR);
127 inputDev_->SendEvent(type, code, value);
128
129 if ((type == EV_SYN) && (code == SYN_REPORT)) {
130 std::this_thread::sleep_for(std::chrono::milliseconds(minimumInterval_));
131 }
132 return RET_OK;
133 }
134
GetName() const135 std::string VirtualDevice::GetName() const
136 {
137 if (!name_.empty()) {
138 return name_;
139 }
140 if (inputDev_ != nullptr) {
141 return inputDev_->GetName();
142 }
143 return {};
144 }
145
SetMinimumInterval(int32_t interval)146 void VirtualDevice::SetMinimumInterval(int32_t interval)
147 {
148 minimumInterval_ = std::max(MINIMUM_INTERVAL_ALLOWED, std::min(interval, MAXIMUM_INTERVAL_ALLOWED));
149 }
150 } // namespace DeviceStatus
151 } // namespace Msdp
152 } // namespace OHOS