| // Copyright 2014 The Chromium 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 "device/usb/usb_device_handle_impl.h" |
| |
| #include <algorithm> |
| #include <vector> |
| |
| #include "base/bind.h" |
| #include "base/location.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/stl_util.h" |
| #include "base/strings/string16.h" |
| #include "base/synchronization/lock.h" |
| #include "base/thread_task_runner_handle.h" |
| #include "device/usb/usb_context.h" |
| #include "device/usb/usb_descriptors.h" |
| #include "device/usb/usb_device_impl.h" |
| #include "device/usb/usb_error.h" |
| #include "device/usb/usb_service.h" |
| #include "third_party/libusb/src/libusb/libusb.h" |
| |
| namespace device { |
| |
| typedef libusb_device* PlatformUsbDevice; |
| |
| void HandleTransferCompletion(PlatformUsbTransferHandle transfer); |
| |
| namespace { |
| |
| static uint8 ConvertTransferDirection(const UsbEndpointDirection direction) { |
| switch (direction) { |
| case USB_DIRECTION_INBOUND: |
| return LIBUSB_ENDPOINT_IN; |
| case USB_DIRECTION_OUTBOUND: |
| return LIBUSB_ENDPOINT_OUT; |
| default: |
| NOTREACHED(); |
| return LIBUSB_ENDPOINT_IN; |
| } |
| } |
| |
| static uint8 CreateRequestType( |
| const UsbEndpointDirection direction, |
| const UsbDeviceHandle::TransferRequestType request_type, |
| const UsbDeviceHandle::TransferRecipient recipient) { |
| uint8 result = ConvertTransferDirection(direction); |
| |
| switch (request_type) { |
| case UsbDeviceHandle::STANDARD: |
| result |= LIBUSB_REQUEST_TYPE_STANDARD; |
| break; |
| case UsbDeviceHandle::CLASS: |
| result |= LIBUSB_REQUEST_TYPE_CLASS; |
| break; |
| case UsbDeviceHandle::VENDOR: |
| result |= LIBUSB_REQUEST_TYPE_VENDOR; |
| break; |
| case UsbDeviceHandle::RESERVED: |
| result |= LIBUSB_REQUEST_TYPE_RESERVED; |
| break; |
| } |
| |
| switch (recipient) { |
| case UsbDeviceHandle::DEVICE: |
| result |= LIBUSB_RECIPIENT_DEVICE; |
| break; |
| case UsbDeviceHandle::INTERFACE: |
| result |= LIBUSB_RECIPIENT_INTERFACE; |
| break; |
| case UsbDeviceHandle::ENDPOINT: |
| result |= LIBUSB_RECIPIENT_ENDPOINT; |
| break; |
| case UsbDeviceHandle::OTHER: |
| result |= LIBUSB_RECIPIENT_OTHER; |
| break; |
| } |
| |
| return result; |
| } |
| |
| static UsbTransferStatus ConvertTransferStatus( |
| const libusb_transfer_status status) { |
| switch (status) { |
| case LIBUSB_TRANSFER_COMPLETED: |
| return USB_TRANSFER_COMPLETED; |
| case LIBUSB_TRANSFER_ERROR: |
| return USB_TRANSFER_ERROR; |
| case LIBUSB_TRANSFER_TIMED_OUT: |
| return USB_TRANSFER_TIMEOUT; |
| case LIBUSB_TRANSFER_STALL: |
| return USB_TRANSFER_STALLED; |
| case LIBUSB_TRANSFER_NO_DEVICE: |
| return USB_TRANSFER_DISCONNECT; |
| case LIBUSB_TRANSFER_OVERFLOW: |
| return USB_TRANSFER_OVERFLOW; |
| case LIBUSB_TRANSFER_CANCELLED: |
| return USB_TRANSFER_CANCELLED; |
| default: |
| NOTREACHED(); |
| return USB_TRANSFER_ERROR; |
| } |
| } |
| |
| } // namespace |
| |
| class UsbDeviceHandleImpl::InterfaceClaimer |
| : public base::RefCountedThreadSafe<UsbDeviceHandleImpl::InterfaceClaimer> { |
| public: |
| InterfaceClaimer(const scoped_refptr<UsbDeviceHandleImpl> handle, |
| const int interface_number); |
| |
| bool Claim() const; |
| |
| int alternate_setting() const { return alternate_setting_; } |
| void set_alternate_setting(const int alternate_setting) { |
| alternate_setting_ = alternate_setting; |
| } |
| |
| private: |
| friend class UsbDevice; |
| friend class base::RefCountedThreadSafe<InterfaceClaimer>; |
| ~InterfaceClaimer(); |
| |
| const scoped_refptr<UsbDeviceHandleImpl> handle_; |
| const int interface_number_; |
| int alternate_setting_; |
| |
| DISALLOW_COPY_AND_ASSIGN(InterfaceClaimer); |
| }; |
| |
| UsbDeviceHandleImpl::InterfaceClaimer::InterfaceClaimer( |
| const scoped_refptr<UsbDeviceHandleImpl> handle, |
| const int interface_number) |
| : handle_(handle), |
| interface_number_(interface_number), |
| alternate_setting_(0) { |
| } |
| |
| UsbDeviceHandleImpl::InterfaceClaimer::~InterfaceClaimer() { |
| libusb_release_interface(handle_->handle(), interface_number_); |
| } |
| |
| bool UsbDeviceHandleImpl::InterfaceClaimer::Claim() const { |
| const int rv = libusb_claim_interface(handle_->handle(), interface_number_); |
| if (rv != LIBUSB_SUCCESS) { |
| VLOG(1) << "Failed to claim interface: " |
| << ConvertPlatformUsbErrorToString(rv); |
| } |
| return rv == LIBUSB_SUCCESS; |
| } |
| |
| struct UsbDeviceHandleImpl::Transfer { |
| Transfer(); |
| ~Transfer(); |
| |
| void Complete(UsbTransferStatus status, size_t bytes_transferred); |
| |
| UsbTransferType transfer_type; |
| scoped_refptr<net::IOBuffer> buffer; |
| scoped_refptr<UsbDeviceHandleImpl::InterfaceClaimer> claimed_interface; |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner; |
| size_t length; |
| UsbTransferCallback callback; |
| }; |
| |
| UsbDeviceHandleImpl::Transfer::Transfer() |
| : transfer_type(USB_TRANSFER_CONTROL), length(0) { |
| } |
| |
| UsbDeviceHandleImpl::Transfer::~Transfer() { |
| } |
| |
| void UsbDeviceHandleImpl::Transfer::Complete(UsbTransferStatus status, |
| size_t bytes_transferred) { |
| if (task_runner->RunsTasksOnCurrentThread()) { |
| callback.Run(status, buffer, bytes_transferred); |
| } else { |
| task_runner->PostTask( |
| FROM_HERE, base::Bind(callback, status, buffer, bytes_transferred)); |
| } |
| } |
| |
| UsbDeviceHandleImpl::UsbDeviceHandleImpl(scoped_refptr<UsbContext> context, |
| UsbDeviceImpl* device, |
| PlatformUsbDeviceHandle handle, |
| const UsbConfigDescriptor& config) |
| : device_(device), |
| handle_(handle), |
| config_(config), |
| context_(context), |
| task_runner_(base::ThreadTaskRunnerHandle::Get()) { |
| DCHECK(handle) << "Cannot create device with NULL handle."; |
| } |
| |
| UsbDeviceHandleImpl::~UsbDeviceHandleImpl() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| libusb_close(handle_); |
| handle_ = NULL; |
| } |
| |
| scoped_refptr<UsbDevice> UsbDeviceHandleImpl::GetDevice() const { |
| return static_cast<UsbDevice*>(device_); |
| } |
| |
| void UsbDeviceHandleImpl::Close() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (device_) |
| device_->Close(this); |
| } |
| |
| bool UsbDeviceHandleImpl::ClaimInterface(const int interface_number) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (!device_) |
| return false; |
| if (ContainsKey(claimed_interfaces_, interface_number)) |
| return true; |
| |
| scoped_refptr<InterfaceClaimer> claimer = |
| new InterfaceClaimer(this, interface_number); |
| |
| if (claimer->Claim()) { |
| claimed_interfaces_[interface_number] = claimer; |
| RefreshEndpointMap(); |
| return true; |
| } |
| return false; |
| } |
| |
| bool UsbDeviceHandleImpl::ReleaseInterface(const int interface_number) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (!device_) |
| return false; |
| if (!ContainsKey(claimed_interfaces_, interface_number)) |
| return false; |
| |
| // Cancel all the transfers on that interface. |
| InterfaceClaimer* interface_claimer = |
| claimed_interfaces_[interface_number].get(); |
| for (TransferMap::iterator it = transfers_.begin(); it != transfers_.end(); |
| ++it) { |
| if (it->second.claimed_interface.get() == interface_claimer) |
| libusb_cancel_transfer(it->first); |
| } |
| claimed_interfaces_.erase(interface_number); |
| |
| RefreshEndpointMap(); |
| return true; |
| } |
| |
| bool UsbDeviceHandleImpl::SetInterfaceAlternateSetting( |
| const int interface_number, |
| const int alternate_setting) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (!device_) |
| return false; |
| if (!ContainsKey(claimed_interfaces_, interface_number)) |
| return false; |
| const int rv = libusb_set_interface_alt_setting( |
| handle_, interface_number, alternate_setting); |
| if (rv == LIBUSB_SUCCESS) { |
| claimed_interfaces_[interface_number]->set_alternate_setting( |
| alternate_setting); |
| RefreshEndpointMap(); |
| } else { |
| VLOG(1) << "Failed to set interface (" << interface_number << ", " |
| << alternate_setting |
| << "): " << ConvertPlatformUsbErrorToString(rv); |
| } |
| return rv == LIBUSB_SUCCESS; |
| } |
| |
| bool UsbDeviceHandleImpl::ResetDevice() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (!device_) |
| return false; |
| |
| const int rv = libusb_reset_device(handle_); |
| if (rv != LIBUSB_SUCCESS) { |
| VLOG(1) << "Failed to reset device: " |
| << ConvertPlatformUsbErrorToString(rv); |
| } |
| return rv == LIBUSB_SUCCESS; |
| } |
| |
| bool UsbDeviceHandleImpl::GetStringDescriptor(uint8 string_id, |
| base::string16* string) { |
| if (!GetSupportedLanguages()) { |
| return false; |
| } |
| |
| std::map<uint8, base::string16>::const_iterator it = strings_.find(string_id); |
| if (it != strings_.end()) { |
| *string = it->second; |
| return true; |
| } |
| |
| for (size_t i = 0; i < languages_.size(); ++i) { |
| // Get the string using language ID. |
| uint16 language_id = languages_[i]; |
| // The 1-byte length field limits the descriptor to 256-bytes (128 char16s). |
| base::char16 text[128]; |
| int size = |
| libusb_get_string_descriptor(handle_, |
| string_id, |
| language_id, |
| reinterpret_cast<unsigned char*>(&text[0]), |
| sizeof(text)); |
| if (size < 0) { |
| VLOG(1) << "Failed to get string descriptor " << string_id << " (langid " |
| << language_id << "): " << ConvertPlatformUsbErrorToString(size); |
| continue; |
| } else if (size < 2) { |
| VLOG(1) << "String descriptor " << string_id << " (langid " << language_id |
| << ") has no header."; |
| continue; |
| // The first 2 bytes of the descriptor are the total length and type tag. |
| } else if ((text[0] & 0xff) != size) { |
| VLOG(1) << "String descriptor " << string_id << " (langid " << language_id |
| << ") size mismatch: " << (text[0] & 0xff) << " != " << size; |
| continue; |
| } else if ((text[0] >> 8) != LIBUSB_DT_STRING) { |
| VLOG(1) << "String descriptor " << string_id << " (langid " << language_id |
| << ") is not a string descriptor."; |
| continue; |
| } |
| |
| *string = base::string16(text + 1, (size - 2) / 2); |
| strings_[string_id] = *string; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void UsbDeviceHandleImpl::ControlTransfer( |
| const UsbEndpointDirection direction, |
| const TransferRequestType request_type, |
| const TransferRecipient recipient, |
| const uint8 request, |
| const uint16 value, |
| const uint16 index, |
| net::IOBuffer* buffer, |
| const size_t length, |
| const unsigned int timeout, |
| const UsbTransferCallback& callback) { |
| if (!device_) { |
| callback.Run(USB_TRANSFER_DISCONNECT, buffer, 0); |
| return; |
| } |
| |
| const size_t resized_length = LIBUSB_CONTROL_SETUP_SIZE + length; |
| scoped_refptr<net::IOBuffer> resized_buffer( |
| new net::IOBufferWithSize(static_cast<int>(resized_length))); |
| if (!resized_buffer.get()) { |
| callback.Run(USB_TRANSFER_ERROR, buffer, 0); |
| return; |
| } |
| memcpy(resized_buffer->data() + LIBUSB_CONTROL_SETUP_SIZE, |
| buffer->data(), |
| static_cast<int>(length)); |
| |
| PlatformUsbTransferHandle const transfer = libusb_alloc_transfer(0); |
| const uint8 converted_type = |
| CreateRequestType(direction, request_type, recipient); |
| libusb_fill_control_setup(reinterpret_cast<uint8*>(resized_buffer->data()), |
| converted_type, |
| request, |
| value, |
| index, |
| static_cast<int16>(length)); |
| libusb_fill_control_transfer(transfer, |
| handle_, |
| reinterpret_cast<uint8*>(resized_buffer->data()), |
| &UsbDeviceHandleImpl::PlatformTransferCallback, |
| this, |
| timeout); |
| |
| PostOrSubmitTransfer(transfer, |
| USB_TRANSFER_CONTROL, |
| resized_buffer.get(), |
| resized_length, |
| callback); |
| } |
| |
| void UsbDeviceHandleImpl::BulkTransfer(const UsbEndpointDirection direction, |
| const uint8 endpoint, |
| net::IOBuffer* buffer, |
| const size_t length, |
| const unsigned int timeout, |
| const UsbTransferCallback& callback) { |
| if (!device_) { |
| callback.Run(USB_TRANSFER_DISCONNECT, buffer, 0); |
| return; |
| } |
| |
| PlatformUsbTransferHandle const transfer = libusb_alloc_transfer(0); |
| const uint8 new_endpoint = ConvertTransferDirection(direction) | endpoint; |
| libusb_fill_bulk_transfer(transfer, |
| handle_, |
| new_endpoint, |
| reinterpret_cast<uint8*>(buffer->data()), |
| static_cast<int>(length), |
| &UsbDeviceHandleImpl::PlatformTransferCallback, |
| this, |
| timeout); |
| |
| PostOrSubmitTransfer(transfer, USB_TRANSFER_BULK, buffer, length, callback); |
| } |
| |
| void UsbDeviceHandleImpl::InterruptTransfer( |
| const UsbEndpointDirection direction, |
| const uint8 endpoint, |
| net::IOBuffer* buffer, |
| const size_t length, |
| const unsigned int timeout, |
| const UsbTransferCallback& callback) { |
| if (!device_) { |
| callback.Run(USB_TRANSFER_DISCONNECT, buffer, 0); |
| return; |
| } |
| |
| PlatformUsbTransferHandle const transfer = libusb_alloc_transfer(0); |
| const uint8 new_endpoint = ConvertTransferDirection(direction) | endpoint; |
| libusb_fill_interrupt_transfer(transfer, |
| handle_, |
| new_endpoint, |
| reinterpret_cast<uint8*>(buffer->data()), |
| static_cast<int>(length), |
| &UsbDeviceHandleImpl::PlatformTransferCallback, |
| this, |
| timeout); |
| |
| PostOrSubmitTransfer( |
| transfer, USB_TRANSFER_INTERRUPT, buffer, length, callback); |
| } |
| |
| void UsbDeviceHandleImpl::IsochronousTransfer( |
| const UsbEndpointDirection direction, |
| const uint8 endpoint, |
| net::IOBuffer* buffer, |
| const size_t length, |
| const unsigned int packets, |
| const unsigned int packet_length, |
| const unsigned int timeout, |
| const UsbTransferCallback& callback) { |
| if (!device_) { |
| callback.Run(USB_TRANSFER_DISCONNECT, buffer, 0); |
| return; |
| } |
| |
| const uint64 total_length = packets * packet_length; |
| CHECK(packets <= length && total_length <= length) |
| << "transfer length is too small"; |
| |
| PlatformUsbTransferHandle const transfer = libusb_alloc_transfer(packets); |
| const uint8 new_endpoint = ConvertTransferDirection(direction) | endpoint; |
| libusb_fill_iso_transfer(transfer, |
| handle_, |
| new_endpoint, |
| reinterpret_cast<uint8*>(buffer->data()), |
| static_cast<int>(length), |
| packets, |
| &UsbDeviceHandleImpl::PlatformTransferCallback, |
| this, |
| timeout); |
| libusb_set_iso_packet_lengths(transfer, packet_length); |
| |
| PostOrSubmitTransfer( |
| transfer, USB_TRANSFER_ISOCHRONOUS, buffer, length, callback); |
| } |
| |
| void UsbDeviceHandleImpl::RefreshEndpointMap() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| endpoint_map_.clear(); |
| for (ClaimedInterfaceMap::iterator claimedIt = claimed_interfaces_.begin(); |
| claimedIt != claimed_interfaces_.end(); |
| ++claimedIt) { |
| for (UsbInterfaceDescriptor::Iterator ifaceIt = config_.interfaces.begin(); |
| ifaceIt != config_.interfaces.end(); |
| ++ifaceIt) { |
| if (ifaceIt->interface_number == claimedIt->first && |
| ifaceIt->alternate_setting == |
| claimedIt->second->alternate_setting()) { |
| for (UsbEndpointDescriptor::Iterator endpointIt = |
| ifaceIt->endpoints.begin(); |
| endpointIt != ifaceIt->endpoints.end(); |
| ++endpointIt) { |
| endpoint_map_[endpointIt->address] = claimedIt->first; |
| } |
| break; |
| } |
| } |
| } |
| } |
| |
| scoped_refptr<UsbDeviceHandleImpl::InterfaceClaimer> |
| UsbDeviceHandleImpl::GetClaimedInterfaceForEndpoint(unsigned char endpoint) { |
| if (ContainsKey(endpoint_map_, endpoint)) |
| return claimed_interfaces_[endpoint_map_[endpoint]]; |
| return NULL; |
| } |
| |
| void UsbDeviceHandleImpl::PostOrSubmitTransfer( |
| PlatformUsbTransferHandle transfer, |
| UsbTransferType transfer_type, |
| net::IOBuffer* buffer, |
| size_t length, |
| const UsbTransferCallback& callback) { |
| if (task_runner_->RunsTasksOnCurrentThread()) { |
| SubmitTransfer(transfer, |
| transfer_type, |
| buffer, |
| length, |
| base::ThreadTaskRunnerHandle::Get(), |
| callback); |
| } else { |
| task_runner_->PostTask(FROM_HERE, |
| base::Bind(&UsbDeviceHandleImpl::SubmitTransfer, |
| this, |
| transfer, |
| transfer_type, |
| make_scoped_refptr(buffer), |
| length, |
| base::ThreadTaskRunnerHandle::Get(), |
| callback)); |
| } |
| } |
| |
| void UsbDeviceHandleImpl::SubmitTransfer( |
| PlatformUsbTransferHandle handle, |
| UsbTransferType transfer_type, |
| net::IOBuffer* buffer, |
| const size_t length, |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner, |
| const UsbTransferCallback& callback) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| Transfer transfer; |
| transfer.transfer_type = transfer_type; |
| transfer.buffer = buffer; |
| transfer.length = length; |
| transfer.callback = callback; |
| transfer.task_runner = task_runner; |
| |
| if (!device_) { |
| transfer.Complete(USB_TRANSFER_DISCONNECT, 0); |
| return; |
| } |
| |
| // It's OK for this method to return NULL. libusb_submit_transfer will fail if |
| // it requires an interface we didn't claim. |
| transfer.claimed_interface = GetClaimedInterfaceForEndpoint(handle->endpoint); |
| |
| const int rv = libusb_submit_transfer(handle); |
| if (rv == LIBUSB_SUCCESS) { |
| transfers_[handle] = transfer; |
| } else { |
| VLOG(1) << "Failed to submit transfer: " |
| << ConvertPlatformUsbErrorToString(rv); |
| transfer.Complete(USB_TRANSFER_ERROR, 0); |
| } |
| } |
| |
| /* static */ |
| void LIBUSB_CALL UsbDeviceHandleImpl::PlatformTransferCallback( |
| PlatformUsbTransferHandle transfer) { |
| UsbDeviceHandleImpl* device_handle = |
| reinterpret_cast<UsbDeviceHandleImpl*>(transfer->user_data); |
| device_handle->task_runner_->PostTask( |
| FROM_HERE, |
| base::Bind( |
| &UsbDeviceHandleImpl::CompleteTransfer, device_handle, transfer)); |
| } |
| |
| void UsbDeviceHandleImpl::CompleteTransfer(PlatformUsbTransferHandle handle) { |
| DCHECK(ContainsKey(transfers_, handle)) << "Missing transfer completed"; |
| |
| Transfer transfer = transfers_[handle]; |
| transfers_.erase(handle); |
| |
| DCHECK_GE(handle->actual_length, 0) << "Negative actual length received"; |
| size_t actual_length = |
| static_cast<size_t>(std::max(handle->actual_length, 0)); |
| |
| DCHECK(transfer.length >= actual_length) |
| << "data too big for our buffer (libusb failure?)"; |
| |
| switch (transfer.transfer_type) { |
| case USB_TRANSFER_CONTROL: |
| // If the transfer is a control transfer we do not expose the control |
| // setup header to the caller. This logic strips off the header if |
| // present before invoking the callback provided with the transfer. |
| if (actual_length > 0) { |
| CHECK(transfer.length >= LIBUSB_CONTROL_SETUP_SIZE) |
| << "buffer was not correctly set: too small for the control header"; |
| |
| if (transfer.length >= (LIBUSB_CONTROL_SETUP_SIZE + actual_length)) { |
| // If the payload is zero bytes long, pad out the allocated buffer |
| // size to one byte so that an IOBuffer of that size can be allocated. |
| scoped_refptr<net::IOBuffer> resized_buffer = |
| new net::IOBuffer(static_cast<int>( |
| std::max(actual_length, static_cast<size_t>(1)))); |
| memcpy(resized_buffer->data(), |
| transfer.buffer->data() + LIBUSB_CONTROL_SETUP_SIZE, |
| actual_length); |
| transfer.buffer = resized_buffer; |
| } |
| } |
| break; |
| |
| case USB_TRANSFER_ISOCHRONOUS: |
| // Isochronous replies might carry data in the different isoc packets even |
| // if the transfer actual_data value is zero. Furthermore, not all of the |
| // received packets might contain data, so we need to calculate how many |
| // data bytes we are effectively providing and pack the results. |
| if (actual_length == 0) { |
| size_t packet_buffer_start = 0; |
| for (int i = 0; i < handle->num_iso_packets; ++i) { |
| PlatformUsbIsoPacketDescriptor packet = &handle->iso_packet_desc[i]; |
| if (packet->actual_length > 0) { |
| // We don't need to copy as long as all packets until now provide |
| // all the data the packet can hold. |
| if (actual_length < packet_buffer_start) { |
| CHECK(packet_buffer_start + packet->actual_length <= |
| transfer.length); |
| memmove(transfer.buffer->data() + actual_length, |
| transfer.buffer->data() + packet_buffer_start, |
| packet->actual_length); |
| } |
| actual_length += packet->actual_length; |
| } |
| |
| packet_buffer_start += packet->length; |
| } |
| } |
| break; |
| |
| case USB_TRANSFER_BULK: |
| case USB_TRANSFER_INTERRUPT: |
| break; |
| |
| default: |
| NOTREACHED() << "Invalid usb transfer type"; |
| break; |
| } |
| |
| transfer.Complete(ConvertTransferStatus(handle->status), actual_length); |
| libusb_free_transfer(handle); |
| |
| // Must release interface first before actually delete this. |
| transfer.claimed_interface = NULL; |
| } |
| |
| bool UsbDeviceHandleImpl::GetSupportedLanguages() { |
| if (!languages_.empty()) { |
| return true; |
| } |
| |
| // The 1-byte length field limits the descriptor to 256-bytes (128 uint16s). |
| uint16 languages[128]; |
| int size = libusb_get_string_descriptor( |
| handle_, |
| 0, |
| 0, |
| reinterpret_cast<unsigned char*>(&languages[0]), |
| sizeof(languages)); |
| if (size < 0) { |
| VLOG(1) << "Failed to get list of supported languages: " |
| << ConvertPlatformUsbErrorToString(size); |
| return false; |
| } else if (size < 2) { |
| VLOG(1) << "String descriptor zero has no header."; |
| return false; |
| // The first 2 bytes of the descriptor are the total length and type tag. |
| } else if ((languages[0] & 0xff) != size) { |
| VLOG(1) << "String descriptor zero size mismatch: " << (languages[0] & 0xff) |
| << " != " << size; |
| return false; |
| } else if ((languages[0] >> 8) != LIBUSB_DT_STRING) { |
| VLOG(1) << "String descriptor zero is not a string descriptor."; |
| return false; |
| } |
| |
| languages_.assign(languages[1], languages[(size - 2) / 2]); |
| return true; |
| } |
| |
| void UsbDeviceHandleImpl::InternalClose() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (!device_) |
| return; |
| |
| // Cancel all the transfers. |
| for (TransferMap::iterator it = transfers_.begin(); it != transfers_.end(); |
| ++it) { |
| // The callback will be called some time later. |
| libusb_cancel_transfer(it->first); |
| } |
| |
| // Attempt-release all the interfaces. |
| // It will be retained until the transfer cancellation is finished. |
| claimed_interfaces_.clear(); |
| |
| // Cannot close device handle here. Need to wait for libusb_cancel_transfer to |
| // finish. |
| device_ = NULL; |
| } |
| |
| } // namespace device |