1 /*
2  * Copyright (C) 2016 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 #ifndef DIRECTCHANNEL_H_
18 #define DIRECTCHANNEL_H_
19 
20 #include "ring.h"
21 #include <cutils/native_handle.h>
22 #include <hardware/gralloc.h>
23 #include <hardware/gralloc1.h>
24 #include <hardware/sensors.h>
25 #include <utils/Singleton.h>
26 #include <memory>
27 
28 namespace android {
29 
30 class DirectChannelBase {
31 public:
DirectChannelBase()32     DirectChannelBase() : mError(NO_INIT), mSize(0), mBase(nullptr) { }
~DirectChannelBase()33     virtual ~DirectChannelBase() {}
34 
35     bool isValid();
36     int getError();
37     void write(const sensors_event_t * ev);
38 
39 protected:
40     int mError;
41     std::unique_ptr<LockfreeBuffer> mBuffer;
42 
43     size_t mSize;
44     void* mBase;
45 };
46 
47 class AshmemDirectChannel : public DirectChannelBase {
48 public:
49     AshmemDirectChannel(const struct sensors_direct_mem_t *mem);
50     virtual ~AshmemDirectChannel();
51 private:
52     int mAshmemFd;
53 };
54 
55 class GrallocHalWrapper : public Singleton<GrallocHalWrapper> {
56 public:
57     int registerBuffer(const native_handle_t *handle);
58     int unregisterBuffer(const native_handle_t *handle);
59     int lock(const native_handle_t *handle, int usage, int l, int t, int w, int h, void **vaddr);
60     int unlock(const native_handle_t *handle);
61 private:
62     friend class Singleton<GrallocHalWrapper>;
63     GrallocHalWrapper();
64     ~GrallocHalWrapper();
65     static int mapGralloc1Error(int grallocError);
66 
67     int mError;
68     int mVersion;
69     gralloc_module_t *mGrallocModule;
70     // gralloc
71     alloc_device_t *mAllocDevice;
72 
73     // gralloc1
74     gralloc1_device_t *mGralloc1Device;
75     GRALLOC1_PFN_RETAIN mPfnRetain;
76     GRALLOC1_PFN_RELEASE mPfnRelease;
77     GRALLOC1_PFN_LOCK mPfnLock;
78     GRALLOC1_PFN_UNLOCK mPfnUnlock;
79 };
80 
81 class GrallocDirectChannel : public DirectChannelBase {
82 public:
83     GrallocDirectChannel(const struct sensors_direct_mem_t *mem);
84     virtual ~GrallocDirectChannel();
85 private:
86     native_handle_t *mNativeHandle;
87 };
88 
89 } // namespace android
90 
91 #endif  // DIRECTCHANNEL_H_
92