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// Copyright 2017 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.
#include <memory>
#include <string>
#include <base/files/file_descriptor_watcher_posix.h>
#include <base/files/scoped_file.h>
#include <base/macros.h>
#include "u2fd/hid_interface.h"
extern "C" {
#include <linux/uhid.h>
namespace u2f {
// Create a HID device using the /dev/uhid kernel interface.
class UHidDevice : public HidInterface {
UHidDevice(uint32_t vendor_id,
uint32_t product_id,
const std::string& name,
const std::string& phys);
UHidDevice(const UHidDevice&) = delete;
UHidDevice& operator=(const UHidDevice&) = delete;
~UHidDevice() override;
// HidInterface implementation:
bool Init(uint32_t hid_version, const std::string& report_desc) override;
bool SendReport(const std::string& report) override;
void SetOutputReportHandler(
const HidInterface::OutputReportCallback& on_output_report) override;
// Asks the kernel to create a new hid device node with interface |version|
// presenting the blob |report_desc| as report descriptor.
// Returns true on success.
bool CreateDev(uint32_t version, const std::string& report_desc);
// Asks the kernel to destroy the previously created hid device.
void DestroyDev();
// Sends to the kernel a new event |ev| on the hid device.
// Returns true on success.
bool WriteEvent(const struct uhid_event& ev);
// Callback used when the kernel sends us an event on the hid device.
void FdEvent();
base::ScopedFD fd_; // A file descriptor for /dev/uhid.
bool created_;
uint32_t vendor_id_;
uint32_t product_id_;
std::string name_;
std::string phys_;
HidInterface::OutputReportCallback on_output_report_;
std::unique_ptr<base::FileDescriptorWatcher::Controller> watcher_;
} // namespace u2f
#endif // U2FD_UHID_DEVICE_H_