1 /*
2 * Copyright (C) 2015 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 #define LOG_TAG "EvdevModule"
18 //#define LOG_NDEBUG 0
19
20 #include <memory>
21 #include <string>
22 #include <thread>
23
24 #include <assert.h>
25 #include <hardware/hardware.h>
26 #include <hardware/input.h>
27
28 #include <utils/Log.h>
29
30 #include "InputHub.h"
31 #include "InputDeviceManager.h"
32 #include "InputHost.h"
33
34 namespace android {
35
36 static const char kDevInput[] = "/dev/input";
37
38 class EvdevModule {
39 public:
40 // Takes ownership of the InputHostInterface
41 explicit EvdevModule(InputHostInterface* inputHost);
42
43 void init();
44 void notifyReport(input_report_t* r);
45
46 private:
47 void loop();
48
49 std::unique_ptr<InputHostInterface> mInputHost;
50 std::shared_ptr<InputDeviceManager> mDeviceManager;
51 std::unique_ptr<InputHub> mInputHub;
52 std::thread mPollThread;
53 };
54
55 static std::unique_ptr<EvdevModule> gEvdevModule;
56
EvdevModule(InputHostInterface * inputHost)57 EvdevModule::EvdevModule(InputHostInterface* inputHost) :
58 mInputHost(inputHost),
59 mDeviceManager(std::make_shared<InputDeviceManager>(mInputHost.get())),
60 mInputHub(std::make_unique<InputHub>(mDeviceManager)) {}
61
init()62 void EvdevModule::init() {
63 ALOGV("%s", __func__);
64
65 mInputHub->registerDevicePath(kDevInput);
66 mPollThread = std::thread(&EvdevModule::loop, this);
67 }
68
notifyReport(input_report_t * r)69 void EvdevModule::notifyReport(input_report_t* r) {
70 ALOGV("%s", __func__);
71
72 // notifyReport() will be called from an arbitrary thread within the input
73 // host. Since InputHub is not threadsafe, this is how I expect this to
74 // work:
75 // * notifyReport() will queue up the output report in the EvdevModule and
76 // call wake() on the InputHub.
77 // * In the main loop thread, after returning from poll(), the queue will
78 // be processed with any pending work.
79 }
80
loop()81 void EvdevModule::loop() {
82 ALOGV("%s", __func__);
83 for (;;) {
84 mInputHub->poll();
85
86 // TODO: process any pending work, like notify reports
87 }
88 }
89
90 extern "C" {
91
dummy_open(const hw_module_t __unused * module,const char __unused * id,hw_device_t __unused ** device)92 static int dummy_open(const hw_module_t __unused *module, const char __unused *id,
93 hw_device_t __unused **device) {
94 ALOGW("open not implemented in the input HAL!");
95 return 0;
96 }
97
input_init(const input_module_t * module,input_host_t * host,input_host_callbacks_t cb)98 static void input_init(const input_module_t* module,
99 input_host_t* host, input_host_callbacks_t cb) {
100 LOG_ALWAYS_FATAL_IF(strcmp(module->common.id, INPUT_HARDWARE_MODULE_ID) != 0);
101 auto inputHost = new InputHost(host, cb);
102 gEvdevModule = std::make_unique<EvdevModule>(inputHost);
103 gEvdevModule->init();
104 }
105
input_notify_report(const input_module_t * module,input_report_t * r)106 static void input_notify_report(const input_module_t* module, input_report_t* r) {
107 LOG_ALWAYS_FATAL_IF(strcmp(module->common.id, INPUT_HARDWARE_MODULE_ID) != 0);
108 LOG_ALWAYS_FATAL_IF(gEvdevModule == nullptr);
109 gEvdevModule->notifyReport(r);
110 }
111
112 static struct hw_module_methods_t input_module_methods = {
113 .open = dummy_open,
114 };
115
116 input_module_t HAL_MODULE_INFO_SYM = {
117 .common = {
118 .tag = HARDWARE_MODULE_TAG,
119 .module_api_version = INPUT_MODULE_API_VERSION_1_0,
120 .hal_api_version = HARDWARE_HAL_API_VERSION,
121 .id = INPUT_HARDWARE_MODULE_ID,
122 .name = "Input evdev HAL",
123 .author = "The Android Open Source Project",
124 .methods = &input_module_methods,
125 .dso = NULL,
126 .reserved = {0},
127 },
128
129 .init = input_init,
130 .notify_report = input_notify_report,
131 };
132
133 } // extern "C"
134
135 } // namespace input
136