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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef NVRAM_HAL_NVRAM_DEVICE_ADAPTER_H_
#define NVRAM_HAL_NVRAM_DEVICE_ADAPTER_H_
#include <UniquePtr.h>
#include <hardware/nvram.h>
#include <nvram/messages/nvram_messages.h>
namespace nvram {
// |NvramImplementation| subclasses provide an implementation of the NVRAM HAL
// logic.
class NvramImplementation {
public:
virtual ~NvramImplementation() = default;
// This function services all operations defined for the NVRAM HAL. The input
// parameters are passed in |request| and |response| will be filled in with
// the result and output parameters of the operation.
virtual void Execute(const nvram::Request& request,
nvram::Response* response) = 0;
};
// |NvramDeviceAdapater| provides glue to turn an |NvramImplementation| object
// into an |nvram_device_t| as defined by the NVRAM HAL C API. This is intended
// to be used in the HAL module's |open()| operation. To obtain the desired
// |hw_device_t|, just create an |NvramDeviceAdapter| with a suitable
// |NvramImplementation| and call |as_device()| to get the HAL device pointer.
struct NvramDeviceAdapter {
public:
// Takes ownership of |implementation|.
NvramDeviceAdapter(const hw_module_t* module,
NvramImplementation* implementation);
hw_device_t* as_device() { return &device_.common; }
NvramImplementation* nvram_implementation() { return implementation_.get(); }
private:
nvram_device_t device_;
UniquePtr<NvramImplementation> implementation_;
};
// Make sure |NvramDeviceAdapter| is a standard layout type. This guarantees
// that casting from/to the type of the first non-static member (i.e. |device_|)
// works as expected.
static_assert(std::is_standard_layout<NvramDeviceAdapter>::value,
"NvramDeviceAdapater must be a standard layout type.");
} // namespace nvram
#endif // NVRAM_HAL_NVRAM_DEVICE_ADAPTER_H_
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