| // Copyright 2020 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BIOD_FP_FRAME_COMMAND_H_ |
| #define BIOD_FP_FRAME_COMMAND_H_ |
| |
| #include <array> |
| #include <memory> |
| #include <vector> |
| |
| #include <brillo/secure_blob.h> |
| #include "biod/ec_command.h" |
| |
| namespace biod { |
| |
| // Upper bound of the host command packet transfer size. |
| constexpr static int kMaxPacketSize = 544; |
| using FpFramePacket = std::array<uint8_t, kMaxPacketSize>; |
| |
| class FpFrameCommand |
| : public EcCommand<struct ec_params_fp_frame, FpFramePacket> { |
| public: |
| template <typename T = FpFrameCommand> |
| static std::unique_ptr<T> Create(int index, |
| uint32_t frame_size, |
| uint16_t max_read_size) { |
| static_assert(std::is_base_of<FpFrameCommand, T>::value, |
| "Only classes derived from FpFrameCommand can use Create"); |
| |
| if (frame_size == 0 || max_read_size == 0 || |
| max_read_size > kMaxPacketSize) { |
| return nullptr; |
| } |
| |
| // Using new to access non-public constructor. See |
| // https://abseil.io/tips/134. |
| return base::WrapUnique(new T(index, frame_size, max_read_size)); |
| } |
| |
| ~FpFrameCommand() override = default; |
| |
| bool Run(int fd) override; |
| |
| // This transfers ownership of |frame_data_|. FpFrameCommand no longer has a |
| // copy of the frame after calling this. |
| std::unique_ptr<brillo::SecureVector> frame(); |
| |
| protected: |
| FpFrameCommand(int index, uint32_t frame_size, uint16_t max_read_size) |
| : EcCommand(EC_CMD_FP_FRAME), |
| frame_index_(index), |
| max_read_size_(max_read_size), |
| frame_data_(std::make_unique<brillo::SecureVector>(frame_size)) {} |
| virtual bool EcCommandRun(int fd); |
| |
| private: |
| constexpr static int kMaxRetries = 50; |
| constexpr static int kRetryDelayMs = 100; |
| |
| int frame_index_ = 0; |
| uint16_t max_read_size_ = 0; |
| std::unique_ptr<brillo::SecureVector> frame_data_; |
| }; |
| |
| static_assert(!std::is_copy_constructible<FpFrameCommand>::value, |
| "EcCommands are not copyable by default"); |
| static_assert(!std::is_copy_assignable<FpFrameCommand>::value, |
| "EcCommands are not copy-assignable by default"); |
| |
| } // namespace biod |
| |
| #endif // BIOD_FP_FRAME_COMMAND_H_ |