| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #pragma once |
| |
| #include <ddk/driver.h> |
| #include <fbl/type_support.h> |
| #include <fbl/unique_ptr.h> |
| #include <zircon/assert.h> |
| |
| // DDK tpm protocol support |
| // |
| // :: Mixins :: |
| // |
| // ddk::TpmProtocol is a mixin class that simplifies writing DDK drivers that |
| // interact with the TPM protocol. It takes care of implementing the function pointer tables and |
| // calling into the object that wraps it. |
| // |
| // :: Examples :: |
| // |
| // // A driver that implements a ZX_PROTOCOL_TPM device |
| // class TpmDevice; |
| // using TpmDeviceType = ddk::Device<TpmDevice, /* ddk mixins */>; |
| // |
| // class TpmDevice : public TpmDeviceType, |
| // public ddk::TpmProtocol<TpmDevice> { |
| // public: |
| // TpmDevice(zx_device_t* parent) |
| // : TpmDeviceType("my-tpm-device", parent) {} |
| // |
| // zx_status_t Bind() { |
| // DdkAdd(); |
| // } |
| // |
| // void DdkRelease() { |
| // // Clean up |
| // } |
| // |
| // ... |
| // private: |
| // ... |
| // }; |
| |
| namespace ddk { |
| |
| template <typename D> |
| class TpmProtocol : public internal::base_protocol { |
| public: |
| TpmProtocol() { |
| // Can only inherit from one base_protocol implemenation |
| ZX_ASSERT(ddk_proto_id_ == 0); |
| ddk_proto_id_ = ZX_PROTOCOL_TPM; |
| ddk_proto_ops_ = &ops_; |
| } |
| |
| private: |
| // Empty struct to use for ops, so that we do not break the invariant that ddk_proto_ops_ is |
| // non-null for devices with a protocol. |
| struct { |
| } ops_; |
| }; |
| |
| } // namespace ddk |
