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      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:
     32     DirectChannelBase() : mError(NO_INIT), mSize(0), mBase(nullptr) { }
     33     virtual ~DirectChannelBase() {}
     34     virtual bool memoryMatches(const struct sensors_direct_mem_t *mem) const = 0;
     35 
     36     bool isValid();
     37     int getError();
     38     void write(const sensors_event_t * ev);
     39 
     40 protected:
     41     int mError;
     42     std::unique_ptr<LockfreeBuffer> mBuffer;
     43 
     44     size_t mSize;
     45     void* mBase;
     46 };
     47 
     48 class AshmemDirectChannel : public DirectChannelBase {
     49 public:
     50     AshmemDirectChannel(const struct sensors_direct_mem_t *mem);
     51     ~AshmemDirectChannel() override;
     52     bool memoryMatches(const struct sensors_direct_mem_t *mem) const override;
     53 private:
     54     int mAshmemFd;
     55 };
     56 
     57 class GrallocHalWrapper : public Singleton<GrallocHalWrapper> {
     58 public:
     59     int registerBuffer(const native_handle_t *handle);
     60     int unregisterBuffer(const native_handle_t *handle);
     61     int lock(const native_handle_t *handle, int usage, int l, int t, int w, int h, void **vaddr);
     62     int unlock(const native_handle_t *handle);
     63     bool isSameMemory(const native_handle_t *h1, const native_handle_t *h2);
     64     bool unregisterImplyDelete() { return mUnregisterImplyDelete; }
     65 private:
     66     friend class Singleton<GrallocHalWrapper>;
     67     GrallocHalWrapper();
     68     ~GrallocHalWrapper();
     69     static int mapGralloc1Error(int grallocError);
     70 
     71     int mError;
     72     int mVersion;
     73     gralloc_module_t *mGrallocModule;
     74     // gralloc
     75     alloc_device_t *mAllocDevice;
     76 
     77     // gralloc1
     78     gralloc1_device_t *mGralloc1Device;
     79     GRALLOC1_PFN_RETAIN mPfnRetain;
     80     GRALLOC1_PFN_RELEASE mPfnRelease;
     81     GRALLOC1_PFN_LOCK mPfnLock;
     82     GRALLOC1_PFN_UNLOCK mPfnUnlock;
     83     GRALLOC1_PFN_GET_BACKING_STORE mPfnGetBackingStore;
     84     bool mUnregisterImplyDelete;
     85 };
     86 
     87 class GrallocDirectChannel : public DirectChannelBase {
     88 public:
     89     GrallocDirectChannel(const struct sensors_direct_mem_t *mem);
     90     ~GrallocDirectChannel() override;
     91     bool memoryMatches(const struct sensors_direct_mem_t *mem) const override;
     92 private:
     93     native_handle_t *mNativeHandle;
     94 };
     95 
     96 } // namespace android
     97 
     98 #endif  // DIRECTCHANNEL_H_
     99