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libusb1.py
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# Copyright (C) 2009-2014 Wander Lairson Costa # # The following terms apply to all files associated # with the software unless explicitly disclaimed in individual files. # # The authors hereby grant permission to use, copy, modify, distribute, # and license this software and its documentation for any purpose, provided # that existing copyright notices are retained in all copies and that this # notice is included verbatim in any distributions. No written agreement, # license, or royalty fee is required for any of the authorized uses. # Modifications to this software may be copyrighted by their authors # and need not follow the licensing terms described here, provided that # the new terms are clearly indicated on the first page of each file where # they apply. # # IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY # FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES # ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY # DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. # # THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, # INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE # IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE # NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR # MODIFICATIONS. from ctypes import * import usb.util import sys import logging from usb._debug import methodtrace import usb._interop as _interop import usb._objfinalizer as _objfinalizer import errno import math from usb.core import USBError import usb.libloader __author__ = 'Wander Lairson Costa' __all__ = [ 'get_backend', 'LIBUSB_SUCESS', 'LIBUSB_ERROR_IO', 'LIBUSB_ERROR_INVALID_PARAM', 'LIBUSB_ERROR_ACCESS', 'LIBUSB_ERROR_NO_DEVICE', 'LIBUSB_ERROR_NOT_FOUND', 'LIBUSB_ERROR_BUSY', 'LIBUSB_ERROR_TIMEOUT', 'LIBUSB_ERROR_OVERFLOW', 'LIBUSB_ERROR_PIPE', 'LIBUSB_ERROR_INTERRUPTED', 'LIBUSB_ERROR_NO_MEM', 'LIBUSB_ERROR_NOT_SUPPORTED', 'LIBUSB_ERROR_OTHER' 'LIBUSB_TRANSFER_COMPLETED', 'LIBUSB_TRANSFER_ERROR', 'LIBUSB_TRANSFER_TIMED_OUT', 'LIBUSB_TRANSFER_CANCELLED', 'LIBUSB_TRANSFER_STALL', 'LIBUSB_TRANSFER_NO_DEVICE', 'LIBUSB_TRANSFER_OVERFLOW' ] _logger = logging.getLogger('usb.backend.libusb1') # libusb.h # transfer_type codes # Control endpoint _LIBUSB_TRANSFER_TYPE_CONTROL = 0, # Isochronous endpoint _LIBUSB_TRANSFER_TYPE_ISOCHRONOUS = 1 # Bulk endpoint _LIBUSB_TRANSFER_TYPE_BULK = 2 # Interrupt endpoint _LIBUSB_TRANSFER_TYPE_INTERRUPT = 3 # return codes LIBUSB_SUCCESS = 0 LIBUSB_ERROR_IO = -1 LIBUSB_ERROR_INVALID_PARAM = -2 LIBUSB_ERROR_ACCESS = -3 LIBUSB_ERROR_NO_DEVICE = -4 LIBUSB_ERROR_NOT_FOUND = -5 LIBUSB_ERROR_BUSY = -6 LIBUSB_ERROR_TIMEOUT = -7 LIBUSB_ERROR_OVERFLOW = -8 LIBUSB_ERROR_PIPE = -9 LIBUSB_ERROR_INTERRUPTED = -10 LIBUSB_ERROR_NO_MEM = -11 LIBUSB_ERROR_NOT_SUPPORTED = -12 LIBUSB_ERROR_OTHER = -99 # map return codes to strings _str_error_map = { LIBUSB_SUCCESS:'Success (no error)', LIBUSB_ERROR_IO:'Input/output error', LIBUSB_ERROR_INVALID_PARAM:'Invalid parameter', LIBUSB_ERROR_ACCESS:'Access denied (insufficient permissions)', LIBUSB_ERROR_NO_DEVICE:'No such device (it may have been disconnected)', LIBUSB_ERROR_NOT_FOUND:'Entity not found', LIBUSB_ERROR_BUSY:'Resource busy', LIBUSB_ERROR_TIMEOUT:'Operation timed out', LIBUSB_ERROR_OVERFLOW:'Overflow', LIBUSB_ERROR_PIPE:'Pipe error', LIBUSB_ERROR_INTERRUPTED:'System call interrupted (perhaps due to signal)', LIBUSB_ERROR_NO_MEM:'Insufficient memory', LIBUSB_ERROR_NOT_SUPPORTED:'Operation not supported or unimplemented on this platform', LIBUSB_ERROR_OTHER:'Unknown error' } # map return code to errno values _libusb_errno = { 0:None, LIBUSB_ERROR_IO:errno.__dict__.get('EIO', None), LIBUSB_ERROR_INVALID_PARAM:errno.__dict__.get('EINVAL', None), LIBUSB_ERROR_ACCESS:errno.__dict__.get('EACCES', None), LIBUSB_ERROR_NO_DEVICE:errno.__dict__.get('ENODEV', None), LIBUSB_ERROR_NOT_FOUND:errno.__dict__.get('ENOENT', None), LIBUSB_ERROR_BUSY:errno.__dict__.get('EBUSY', None), LIBUSB_ERROR_TIMEOUT:errno.__dict__.get('ETIMEDOUT', None), LIBUSB_ERROR_OVERFLOW:errno.__dict__.get('EOVERFLOW', None), LIBUSB_ERROR_PIPE:errno.__dict__.get('EPIPE', None), LIBUSB_ERROR_INTERRUPTED:errno.__dict__.get('EINTR', None), LIBUSB_ERROR_NO_MEM:errno.__dict__.get('ENOMEM', None), LIBUSB_ERROR_NOT_SUPPORTED:errno.__dict__.get('ENOSYS', None), LIBUSB_ERROR_OTHER:None } # Transfer status codes: # Note that this does not indicate # that the entire amount of requested data was transferred. LIBUSB_TRANSFER_COMPLETED = 0 LIBUSB_TRANSFER_ERROR = 1 LIBUSB_TRANSFER_TIMED_OUT = 2 LIBUSB_TRANSFER_CANCELLED = 3 LIBUSB_TRANSFER_STALL = 4 LIBUSB_TRANSFER_NO_DEVICE = 5 LIBUSB_TRANSFER_OVERFLOW = 6 # map return codes to strings _str_transfer_error = { LIBUSB_TRANSFER_COMPLETED:'Success (no error)', LIBUSB_TRANSFER_ERROR:'Transfer failed', LIBUSB_TRANSFER_TIMED_OUT:'Transfer timed out', LIBUSB_TRANSFER_CANCELLED:'Transfer was cancelled', LIBUSB_TRANSFER_STALL:'For bulk/interrupt endpoints: halt condition '\ 'detected (endpoint stalled). For control '\ 'endpoints: control request not supported.', LIBUSB_TRANSFER_NO_DEVICE:'Device was disconnected', LIBUSB_TRANSFER_OVERFLOW:'Device sent more data than requested' } # map transfer codes to errno codes _transfer_errno = { LIBUSB_TRANSFER_COMPLETED:0, LIBUSB_TRANSFER_ERROR:errno.__dict__.get('EIO', None), LIBUSB_TRANSFER_TIMED_OUT:errno.__dict__.get('ETIMEDOUT', None), LIBUSB_TRANSFER_CANCELLED:errno.__dict__.get('EAGAIN', None), LIBUSB_TRANSFER_STALL:errno.__dict__.get('EIO', None), LIBUSB_TRANSFER_NO_DEVICE:errno.__dict__.get('ENODEV', None), LIBUSB_TRANSFER_OVERFLOW:errno.__dict__.get('EOVERFLOW', None) } def _strerror(errcode): try: return _lib.libusb_strerror(errcode).decode('utf8') except AttributeError: return _str_error_map[errcode] # Data structures class _libusb_endpoint_descriptor(Structure): _fields_ = [('bLength', c_uint8), ('bDescriptorType', c_uint8), ('bEndpointAddress', c_uint8), ('bmAttributes', c_uint8), ('wMaxPacketSize', c_uint16), ('bInterval', c_uint8), ('bRefresh', c_uint8), ('bSynchAddress', c_uint8), ('extra', POINTER(c_ubyte)), ('extra_length', c_int)] class _libusb_interface_descriptor(Structure): _fields_ = [('bLength', c_uint8), ('bDescriptorType', c_uint8), ('bInterfaceNumber', c_uint8), ('bAlternateSetting', c_uint8), ('bNumEndpoints', c_uint8), ('bInterfaceClass', c_uint8), ('bInterfaceSubClass', c_uint8), ('bInterfaceProtocol', c_uint8), ('iInterface', c_uint8), ('endpoint', POINTER(_libusb_endpoint_descriptor)), ('extra', POINTER(c_ubyte)), ('extra_length', c_int)] class _libusb_interface(Structure): _fields_ = [('altsetting', POINTER(_libusb_interface_descriptor)), ('num_altsetting', c_int)] class _libusb_config_descriptor(Structure): _fields_ = [('bLength', c_uint8), ('bDescriptorType', c_uint8), ('wTotalLength', c_uint16), ('bNumInterfaces', c_uint8), ('bConfigurationValue', c_uint8), ('iConfiguration', c_uint8), ('bmAttributes', c_uint8), ('bMaxPower', c_uint8), ('interface', POINTER(_libusb_interface)), ('extra', POINTER(c_ubyte)), ('extra_length', c_int)] class _libusb_device_descriptor(Structure): _fields_ = [('bLength', c_uint8), ('bDescriptorType', c_uint8), ('bcdUSB', c_uint16), ('bDeviceClass', c_uint8), ('bDeviceSubClass', c_uint8), ('bDeviceProtocol', c_uint8), ('bMaxPacketSize0', c_uint8), ('idVendor', c_uint16), ('idProduct', c_uint16), ('bcdDevice', c_uint16), ('iManufacturer', c_uint8), ('iProduct', c_uint8), ('iSerialNumber', c_uint8), ('bNumConfigurations', c_uint8)] # Isochronous packet descriptor. class _libusb_iso_packet_descriptor(Structure): _fields_ = [('length', c_uint), ('actual_length', c_uint), ('status', c_int)] # enum libusb_transfer_status _libusb_device_handle = c_void_p class _libusb_transfer(Structure): pass _libusb_transfer_p = POINTER(_libusb_transfer) _libusb_transfer_cb_fn_p = CFUNCTYPE(None, _libusb_transfer_p) _libusb_transfer._fields_ = [('dev_handle', _libusb_device_handle), ('flags', c_uint8), ('endpoint', c_uint8), ('type', c_uint8), ('timeout', c_uint), ('status', c_int), # enum libusb_transfer_status ('length', c_int), ('actual_length', c_int), ('callback', _libusb_transfer_cb_fn_p), ('user_data', py_object), ('buffer', c_void_p), ('num_iso_packets', c_int), ('iso_packet_desc', _libusb_iso_packet_descriptor) ] def _get_iso_packet_list(transfer): list_type = _libusb_iso_packet_descriptor * transfer.num_iso_packets return list_type.from_address(addressof(transfer.iso_packet_desc)) _lib = None def _load_library(find_library=None): # Windows backend uses stdcall calling convention # # On FreeBSD 8/9, libusb 1.0 and libusb 0.1 are in the same shared # object libusb.so, so if we found libusb library name, we must assure # it is 1.0 version. We just try to get some symbol from 1.0 version if sys.platform == 'win32': win_cls = WinDLL else: win_cls = None return usb.libloader.load_locate_library( ('usb-1.0', 'libusb-1.0', 'usb'), 'cygusb-1.0.dll', 'Libusb 1', win_cls=win_cls, find_library=find_library, check_symbols=('libusb_init',)) def _setup_prototypes(lib): # void libusb_set_debug (libusb_context *ctx, int level) lib.libusb_set_debug.argtypes = [c_void_p, c_int] # int libusb_init (libusb_context **context) lib.libusb_init.argtypes = [POINTER(c_void_p)] # void libusb_exit (struct libusb_context *ctx) lib.libusb_exit.argtypes = [c_void_p] # ssize_t libusb_get_device_list (libusb_context *ctx, # libusb_device ***list) lib.libusb_get_device_list.argtypes = [ c_void_p, POINTER(POINTER(c_void_p)) ] # void libusb_free_device_list (libusb_device **list, # int unref_devices) lib.libusb_free_device_list.argtypes = [ POINTER(c_void_p), c_int ] # libusb_device *libusb_ref_device (libusb_device *dev) lib.libusb_ref_device.argtypes = [c_void_p] lib.libusb_ref_device.restype = c_void_p # void libusb_unref_device(libusb_device *dev) lib.libusb_unref_device.argtypes = [c_void_p] # int libusb_open(libusb_device *dev, libusb_device_handle **handle) lib.libusb_open.argtypes = [c_void_p, POINTER(_libusb_device_handle)] # void libusb_close(libusb_device_handle *dev_handle) lib.libusb_close.argtypes = [_libusb_device_handle] # int libusb_set_configuration(libusb_device_handle *dev, # int configuration) lib.libusb_set_configuration.argtypes = [_libusb_device_handle, c_int] # int libusb_get_configuration(libusb_device_handle *dev, # int *config) lib.libusb_get_configuration.argtypes = [_libusb_device_handle, POINTER(c_int)] # int libusb_claim_interface(libusb_device_handle *dev, # int interface_number) lib.libusb_claim_interface.argtypes = [_libusb_device_handle, c_int] # int libusb_release_interface(libusb_device_handle *dev, # int interface_number) lib.libusb_release_interface.argtypes = [_libusb_device_handle, c_int] # int libusb_set_interface_alt_setting(libusb_device_handle *dev, # int interface_number, # int alternate_setting) lib.libusb_set_interface_alt_setting.argtypes = [ _libusb_device_handle, c_int, c_int ] # int libusb_reset_device (libusb_device_handle *dev) lib.libusb_reset_device.argtypes = [_libusb_device_handle] # int libusb_kernel_driver_active(libusb_device_handle *dev, # int interface) lib.libusb_kernel_driver_active.argtypes = [ _libusb_device_handle, c_int ] # int libusb_detach_kernel_driver(libusb_device_handle *dev, # int interface) lib.libusb_detach_kernel_driver.argtypes = [ _libusb_device_handle, c_int ] # int libusb_attach_kernel_driver(libusb_device_handle *dev, # int interface) lib.libusb_attach_kernel_driver.argtypes = [ _libusb_device_handle, c_int ] # int libusb_get_device_descriptor( # libusb_device *dev, # struct libusb_device_descriptor *desc # ) lib.libusb_get_device_descriptor.argtypes = [ c_void_p, POINTER(_libusb_device_descriptor) ] # int libusb_get_config_descriptor( # libusb_device *dev, # uint8_t config_index, # struct libusb_config_descriptor **config # ) lib.libusb_get_config_descriptor.argtypes = [ c_void_p, c_uint8, POINTER(POINTER(_libusb_config_descriptor)) ] # void libusb_free_config_descriptor( # struct libusb_config_descriptor *config # ) lib.libusb_free_config_descriptor.argtypes = [ POINTER(_libusb_config_descriptor) ] # int libusb_get_string_descriptor_ascii(libusb_device_handle *dev, # uint8_t desc_index, # unsigned char *data, # int length) lib.libusb_get_string_descriptor_ascii.argtypes = [ _libusb_device_handle, c_uint8, POINTER(c_ubyte), c_int ] # int libusb_control_transfer(libusb_device_handle *dev_handle, # uint8_t bmRequestType, # uint8_t bRequest, # uint16_t wValue, # uint16_t wIndex, # unsigned char *data, # uint16_t wLength, # unsigned int timeout) lib.libusb_control_transfer.argtypes = [ _libusb_device_handle, c_uint8, c_uint8, c_uint16, c_uint16, POINTER(c_ubyte), c_uint16, c_uint ] #int libusb_bulk_transfer( # struct libusb_device_handle *dev_handle, # unsigned char endpoint, # unsigned char *data, # int length, # int *transferred, # unsigned int timeout # ) lib.libusb_bulk_transfer.argtypes = [ _libusb_device_handle, c_ubyte, POINTER(c_ubyte), c_int, POINTER(c_int), c_uint ] # int libusb_interrupt_transfer( # libusb_device_handle *dev_handle, # unsigned char endpoint, # unsigned char *data, # int length, # int *actual_length, # unsigned int timeout # ); lib.libusb_interrupt_transfer.argtypes = [ _libusb_device_handle, c_ubyte, POINTER(c_ubyte), c_int, POINTER(c_int), c_uint ] # libusb_transfer* libusb_alloc_transfer(int iso_packets); lib.libusb_alloc_transfer.argtypes = [c_int] lib.libusb_alloc_transfer.restype = POINTER(_libusb_transfer) # void libusb_free_transfer(struct libusb_transfer *transfer) lib.libusb_free_transfer.argtypes = [POINTER(_libusb_transfer)] # int libusb_submit_transfer(struct libusb_transfer *transfer); lib.libusb_submit_transfer.argtypes = [POINTER(_libusb_transfer)] if hasattr(lib, 'libusb_strerror'): # const char *libusb_strerror(enum libusb_error errcode) lib.libusb_strerror.argtypes = [c_uint] lib.libusb_strerror.restype = c_char_p # int libusb_clear_halt(libusb_device_handle *dev, unsigned char endpoint) lib.libusb_clear_halt.argtypes = [_libusb_device_handle, c_ubyte] # void libusb_set_iso_packet_lengths( # libusb_transfer* transfer, # unsigned int length # ); def libusb_set_iso_packet_lengths(transfer_p, length): r"""This function is inline in the libusb.h file, so we must implement it. lib.libusb_set_iso_packet_lengths.argtypes = [ POINTER(_libusb_transfer), c_int ] """ transfer = transfer_p.contents for iso_packet_desc in _get_iso_packet_list(transfer): iso_packet_desc.length = length lib.libusb_set_iso_packet_lengths = libusb_set_iso_packet_lengths #int libusb_get_max_iso_packet_size(libusb_device* dev, # unsigned char endpoint); lib.libusb_get_max_iso_packet_size.argtypes = [c_void_p, c_ubyte] # void libusb_fill_iso_transfer( # struct libusb_transfer* transfer, # libusb_device_handle* dev_handle, # unsigned char endpoint, # unsigned char* buffer, # int length, # int num_iso_packets, # libusb_transfer_cb_fn callback, # void * user_data, # unsigned int timeout # ); def libusb_fill_iso_transfer(_libusb_transfer_p, dev_handle, endpoint, buffer, length, num_iso_packets, callback, user_data, timeout): r"""This function is inline in the libusb.h file, so we must implement it. lib.libusb_fill_iso_transfer.argtypes = [ _libusb_transfer, _libusb_device_handle, c_ubyte, POINTER(c_ubyte), c_int, c_int, _libusb_transfer_cb_fn_p, c_void_p, c_uint ] """ transfer = _libusb_transfer_p.contents transfer.dev_handle = dev_handle transfer.endpoint = endpoint transfer.type = _LIBUSB_TRANSFER_TYPE_ISOCHRONOUS transfer.timeout = timeout transfer.buffer = cast(buffer, c_void_p) transfer.length = length transfer.num_iso_packets = num_iso_packets transfer.user_data = user_data transfer.callback = callback lib.libusb_fill_iso_transfer = libusb_fill_iso_transfer # uint8_t libusb_get_bus_number(libusb_device *dev) lib.libusb_get_bus_number.argtypes = [c_void_p] lib.libusb_get_bus_number.restype = c_uint8 # uint8_t libusb_get_device_address(libusb_device *dev) lib.libusb_get_device_address.argtypes = [c_void_p] lib.libusb_get_device_address.restype = c_uint8 try: # uint8_t libusb_get_device_speed(libusb_device *dev) lib.libusb_get_device_speed.argtypes = [c_void_p] lib.libusb_get_device_speed.restype = c_uint8 except AttributeError: pass try: # uint8_t libusb_get_port_number(libusb_device *dev) lib.libusb_get_port_number.argtypes = [c_void_p] lib.libusb_get_port_number.restype = c_uint8 except AttributeError: pass try: # int libusb_get_port_numbers(libusb_device *dev, # uint8_t* port_numbers, # int port_numbers_len) lib.libusb_get_port_numbers.argtypes = [ c_void_p, POINTER(c_uint8), c_int ] lib.libusb_get_port_numbers.restype = c_int except AttributeError: pass #int libusb_handle_events(libusb_context *ctx); lib.libusb_handle_events.argtypes = [c_void_p] # check a libusb function call def _check(ret): if hasattr(ret, 'value'): ret = ret.value if ret < 0: if ret == LIBUSB_ERROR_NOT_SUPPORTED: raise NotImplementedError(_strerror(ret)) else: raise USBError(_strerror(ret), ret, _libusb_errno[ret]) return ret # wrap a device class _Device(_objfinalizer.AutoFinalizedObject): def __init__(self, devid): self.devid = _lib.libusb_ref_device(devid) def _finalize_object(self): _lib.libusb_unref_device(self.devid) # wrap a descriptor and keep a reference to another object # Thanks to Thomas Reitmayr. class _WrapDescriptor(object): def __init__(self, desc, obj = None): self.obj = obj self.desc = desc def __getattr__(self, name): return getattr(self.desc, name) # wrap a configuration descriptor class _ConfigDescriptor(_objfinalizer.AutoFinalizedObject): def __init__(self, desc): self.desc = desc def _finalize_object(self): _lib.libusb_free_config_descriptor(self.desc) def __getattr__(self, name): return getattr(self.desc.contents, name) # iterator for libusb devices class _DevIterator(_objfinalizer.AutoFinalizedObject): def __init__(self, ctx): self.dev_list = POINTER(c_void_p)() self.num_devs = _check(_lib.libusb_get_device_list( ctx, byref(self.dev_list)) ) def __iter__(self): for i in range(self.num_devs): yield _Device(self.dev_list[i]) def _finalize_object(self): _lib.libusb_free_device_list(self.dev_list, 1) class _DeviceHandle(object): def __init__(self, dev): self.handle = _libusb_device_handle() self.devid = dev.devid _check(_lib.libusb_open(self.devid, byref(self.handle))) class _IsoTransferHandler(_objfinalizer.AutoFinalizedObject): def __init__(self, dev_handle, ep, buff, timeout): address, length = buff.buffer_info() packet_length = _lib.libusb_get_max_iso_packet_size(dev_handle.devid, ep) packet_count = int(math.ceil(float(length) / packet_length)) self.transfer = _lib.libusb_alloc_transfer(packet_count) _lib.libusb_fill_iso_transfer(self.transfer, dev_handle.handle, ep, cast(address, POINTER(c_ubyte)), length, packet_count, _libusb_transfer_cb_fn_p(self.__callback), None, timeout) self.__set_packets_length(length, packet_length) def _finalize_object(self): _lib.libusb_free_transfer(self.transfer) def submit(self, ctx = None): self.__callback_done = 0 _check(_lib.libusb_submit_transfer(self.transfer)) while not self.__callback_done: _check(_lib.libusb_handle_events(ctx)) status = int(self.transfer.contents.status) if status != LIBUSB_TRANSFER_COMPLETED: raise usb.USBError(_str_transfer_error[status], status, _transfer_errno[status]) return self.__compute_size_transf_data() def __compute_size_transf_data(self): return sum([t.actual_length for t in _get_iso_packet_list(self.transfer.contents)]) def __set_packets_length(self, n, packet_length): _lib.libusb_set_iso_packet_lengths(self.transfer, packet_length) r = n % packet_length if r: iso_packets = _get_iso_packet_list(self.transfer.contents) # When the device is disconnected, this list may # return with length 0 if len(iso_packets): iso_packets[-1].length = r def __callback(self, transfer): self.__callback_done = 1 # implementation of libusb 1.0 backend class _LibUSB(usb.backend.IBackend): @methodtrace(_logger) def __init__(self, lib): usb.backend.IBackend.__init__(self) self.lib = lib self.ctx = c_void_p() _check(self.lib.libusb_init(byref(self.ctx))) @methodtrace(_logger) def _finalize_object(self): self.lib.libusb_exit(self.ctx) @methodtrace(_logger) def enumerate_devices(self): return _DevIterator(self.ctx) @methodtrace(_logger) def get_device_descriptor(self, dev): dev_desc = _libusb_device_descriptor() _check(self.lib.libusb_get_device_descriptor(dev.devid, byref(dev_desc))) dev_desc.bus = self.lib.libusb_get_bus_number(dev.devid) dev_desc.address = self.lib.libusb_get_device_address(dev.devid) # Only available in newer versions of libusb try: dev_desc.speed = self.lib.libusb_get_device_speed(dev.devid) except AttributeError: dev_desc.speed = None # Only available in newer versions of libusb try: dev_desc.port_number = self.lib.libusb_get_port_number(dev.devid) except AttributeError: dev_desc.port_number = None # Only available in newer versions of libusb try: buff = (c_uint8 * 7)() # USB 3.0 maximum depth is 7 written = dev_desc.port_numbers = self.lib.libusb_get_port_numbers( dev.devid, buff, len(buff)) if written > 0: dev_desc.port_numbers = tuple(buff[:written]) else: dev_desc.port_numbers = None except AttributeError: dev_desc.port_numbers = None return dev_desc @methodtrace(_logger) def get_configuration_descriptor(self, dev, config): cfg = POINTER(_libusb_config_descriptor)() _check(self.lib.libusb_get_config_descriptor( dev.devid, config, byref(cfg))) config_desc = _ConfigDescriptor(cfg) config_desc.extra_descriptors = ( config_desc.extra[:config_desc.extra_length]) return config_desc @methodtrace(_logger) def get_interface_descriptor(self, dev, intf, alt, config): cfg = self.get_configuration_descriptor(dev, config) if intf >= cfg.bNumInterfaces: raise IndexError('Invalid interface index ' + str(intf)) i = cfg.interface[intf] if alt >= i.num_altsetting: raise IndexError('Invalid alternate setting index ' + str(alt)) intf_desc = i.altsetting[alt] intf_desc.extra_descriptors = intf_desc.extra[:intf_desc.extra_length] return _WrapDescriptor(intf_desc, cfg) @methodtrace(_logger) def get_endpoint_descriptor(self, dev, ep, intf, alt, config): i = self.get_interface_descriptor(dev, intf, alt, config) if ep > i.bNumEndpoints: raise IndexError('Invalid endpoint index ' + str(ep)) ep_desc = i.endpoint[ep] ep_desc.extra_descriptors = ep_desc.extra[:ep_desc.extra_length] return _WrapDescriptor(ep_desc, i) @methodtrace(_logger) def open_device(self, dev): return _DeviceHandle(dev) @methodtrace(_logger) def close_device(self, dev_handle): self.lib.libusb_close(dev_handle.handle) @methodtrace(_logger) def set_configuration(self, dev_handle, config_value): _check(self.lib.libusb_set_configuration(dev_handle.handle, config_value)) @methodtrace(_logger) def get_configuration(self, dev_handle): config = c_int() _check(self.lib.libusb_get_configuration(dev_handle.handle, byref(config))) return config.value @methodtrace(_logger) def set_interface_altsetting(self, dev_handle, intf, altsetting): _check(self.lib.libusb_set_interface_alt_setting( dev_handle.handle, intf, altsetting)) @methodtrace(_logger) def claim_interface(self, dev_handle, intf): _check(self.lib.libusb_claim_interface(dev_handle.handle, intf)) @methodtrace(_logger) def release_interface(self, dev_handle, intf): _check(self.lib.libusb_release_interface(dev_handle.handle, intf)) @methodtrace(_logger) def bulk_write(self, dev_handle, ep, intf, data, timeout): return self.__write(self.lib.libusb_bulk_transfer, dev_handle, ep, intf, data, timeout) @methodtrace(_logger) def bulk_read(self, dev_handle, ep, intf, buff, timeout): return self.__read(self.lib.libusb_bulk_transfer, dev_handle, ep, intf, buff, timeout) @methodtrace(_logger) def intr_write(self, dev_handle, ep, intf, data, timeout): return self.__write(self.lib.libusb_interrupt_transfer, dev_handle, ep, intf, data, timeout) @methodtrace(_logger) def intr_read(self, dev_handle, ep, intf, buff, timeout): return self.__read(self.lib.libusb_interrupt_transfer, dev_handle, ep, intf, buff, timeout) @methodtrace(_logger) def iso_write(self, dev_handle, ep, intf, data, timeout): handler = _IsoTransferHandler(dev_handle, ep, data, timeout) return handler.submit(self.ctx) @methodtrace(_logger) def iso_read(self, dev_handle, ep, intf, buff, timeout): handler = _IsoTransferHandler(dev_handle, ep, buff, timeout) return handler.submit(self.ctx) @methodtrace(_logger) def ctrl_transfer(self, dev_handle, bmRequestType, bRequest, wValue, wIndex, data, timeout): addr, length = data.buffer_info() length *= data.itemsize ret = _check(self.lib.libusb_control_transfer( dev_handle.handle, bmRequestType, bRequest, wValue, wIndex, cast(addr, POINTER(c_ubyte)), length, timeout)) return ret @methodtrace(_logger) def clear_halt(self, dev_handle, ep): _check(self.lib.libusb_clear_halt(dev_handle.handle, ep)) @methodtrace(_logger) def reset_device(self, dev_handle): _check(self.lib.libusb_reset_device(dev_handle.handle)) @methodtrace(_logger) def is_kernel_driver_active(self, dev_handle, intf): return bool(_check(self.lib.libusb_kernel_driver_active(dev_handle.handle, intf))) @methodtrace(_logger) def detach_kernel_driver(self, dev_handle, intf): _check(self.lib.libusb_detach_kernel_driver(dev_handle.handle, intf)) @methodtrace(_logger) def attach_kernel_driver(self, dev_handle, intf): _check(self.lib.libusb_attach_kernel_driver(dev_handle.handle, intf)) def __write(self, fn, dev_handle, ep, intf, data, timeout): address, length = data.buffer_info() length *= data.itemsize transferred = c_int() retval = fn(dev_handle.handle, ep, cast(address, POINTER(c_ubyte)), length, byref(transferred), timeout) # do not assume LIBUSB_ERROR_TIMEOUT means no I/O. if not (transferred.value and retval == LIBUSB_ERROR_TIMEOUT): _check(retval) return transferred.value def __read(self, fn, dev_handle, ep, intf, buff, timeout): address, length = buff.buffer_info() length *= buff.itemsize transferred = c_int() retval = fn(dev_handle.handle, ep, cast(address, POINTER(c_ubyte)), length, byref(transferred), timeout) # do not assume LIBUSB_ERROR_TIMEOUT means no I/O. if not (transferred.value and retval == LIBUSB_ERROR_TIMEOUT): _check(retval) return transferred.value def get_backend(find_library=None): global _lib try: if _lib is None: _lib = _load_library(find_library=find_library) _setup_prototypes(_lib) return _LibUSB(_lib) except usb.libloader.LibraryException: # exception already logged (if any) _logger.error('Error loading libusb 1.0 backend', exc_info=False) return None except Exception: _logger.error('Error loading libusb 1.0 backend', exc_info=True) return None