blob: fb5942dcc9203c9d048bf99d3d4da1a0f51ec159 [file] [log] [blame]
// Copyright (c) 2013 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 <stdint.h>
#include <base/macros.h>
#include <base/memory/scoped_vector.h>
#include <base/message_loop/message_loop.h>
#include "mist/usb_error.h"
struct libusb_context;
namespace mist {
class EventDispatcher;
class UsbDevice;
// A USB manager for managing a USB session created by libusb 1.0.
class UsbManager : public base::MessageLoopForIO::Watcher {
// Constructs a UsbManager object by taking a raw pointer to an
// EventDispatcher as |dispatcher|. The ownership of |dispatcher| is not
// transferred, and thus it should outlive this object.
explicit UsbManager(EventDispatcher* dispatcher);
virtual ~UsbManager();
// Initializes a USB session via libusb. Returns true on success.
bool Initialize();
// Sets the debug level of libusb to |level|.
void SetDebugLevel(int level);
// Gets the USB device that is currently connected to the bus numbered
// |bus_number|, at the address |device_address| on the bus, with its vendor
// ID equal to |vendor_id|, and its product ID equal to |product_id|. Returns
// NULL if no such device is found. The returned UsbDevice object becomes
// invalid, and thus should not be held, beyond the lifetime of this object.
// The returned object is also not managed and should be deleted by the caller
// after use.
UsbDevice* GetDevice(uint8_t bus_number,
uint8_t device_address,
uint16_t vendor_id,
uint16_t product_id);
// Gets the list of USB devices currently attached to the system. Returns true
// on success. |devices| is always cleared before being updated. The returned
// UsbDevice objects become invalid, and thus should not be held, beyond the
// lifetime of this object.
bool GetDevices(ScopedVector<UsbDevice>* devices);
const UsbError& error() const { return error_; }
static void OnPollFileDescriptorAdded(int file_descriptor,
short events, // NOLINT
void* user_data);
static void OnPollFileDescriptorRemoved(int file_descriptor, void* user_data);
// Starts watching the file descriptors for libusb events. Returns true on
// success.
bool StartWatchingPollFileDescriptors();
// Handles libusb events in non-blocking mode.
void HandleEventsNonBlocking();
// Implements base::MessageLoopForIO::Watcher.
void OnFileCanReadWithoutBlocking(int file_descriptor) override;
void OnFileCanWriteWithoutBlocking(int file_descriptor) override;
EventDispatcher* const dispatcher_;
libusb_context* context_;
UsbError error_;
} // namespace mist