diff options
Diffstat (limited to 'plugins/wedo_plugin/usb/backend/openusb.py')
| -rw-r--r-- | plugins/wedo_plugin/usb/backend/openusb.py | 707 |
1 files changed, 707 insertions, 0 deletions
diff --git a/plugins/wedo_plugin/usb/backend/openusb.py b/plugins/wedo_plugin/usb/backend/openusb.py new file mode 100644 index 0000000..23e4d45 --- /dev/null +++ b/plugins/wedo_plugin/usb/backend/openusb.py @@ -0,0 +1,707 @@ +# Copyright (C) 2009-2011 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 ctypes.util +import usb.util +from usb._debug import methodtrace +import logging +import errno + +__author__ = 'Wander Lairson Costa' + +__all__ = [ + 'get_backend' + 'OPENUSB_SUCCESS' + 'OPENUSB_PLATFORM_FAILURE' + 'OPENUSB_NO_RESOURCES' + 'OPENUSB_NO_BANDWIDTH' + 'OPENUSB_NOT_SUPPORTED' + 'OPENUSB_HC_HARDWARE_ERROR' + 'OPENUSB_INVALID_PERM' + 'OPENUSB_BUSY' + 'OPENUSB_BADARG' + 'OPENUSB_NOACCESS' + 'OPENUSB_PARSE_ERROR' + 'OPENUSB_UNKNOWN_DEVICE' + 'OPENUSB_INVALID_HANDLE' + 'OPENUSB_SYS_FUNC_FAILURE' + 'OPENUSB_NULL_LIST' + 'OPENUSB_CB_CONTINUE' + 'OPENUSB_CB_TERMINATE' + 'OPENUSB_IO_STALL' + 'OPENUSB_IO_CRC_ERROR' + 'OPENUSB_IO_DEVICE_HUNG' + 'OPENUSB_IO_REQ_TOO_BIG' + 'OPENUSB_IO_BIT_STUFFING' + 'OPENUSB_IO_UNEXPECTED_PID' + 'OPENUSB_IO_DATA_OVERRUN' + 'OPENUSB_IO_DATA_UNDERRUN' + 'OPENUSB_IO_BUFFER_OVERRUN' + 'OPENUSB_IO_BUFFER_UNDERRUN' + 'OPENUSB_IO_PID_CHECK_FAILURE' + 'OPENUSB_IO_DATA_TOGGLE_MISMATCH' + 'OPENUSB_IO_TIMEOUT' + 'OPENUSB_IO_CANCELED' + ] + +_logger = logging.getLogger('usb.backend.openusb') + +OPENUSB_SUCCESS = 0 +OPENUSB_PLATFORM_FAILURE = -1 +OPENUSB_NO_RESOURCES = -2 +OPENUSB_NO_BANDWIDTH = -3 +OPENUSB_NOT_SUPPORTED = -4 +OPENUSB_HC_HARDWARE_ERROR = -5 +OPENUSB_INVALID_PERM = -6 +OPENUSB_BUSY = -7 +OPENUSB_BADARG = -8 +OPENUSB_NOACCESS = -9 +OPENUSB_PARSE_ERROR = -10 +OPENUSB_UNKNOWN_DEVICE = -11 +OPENUSB_INVALID_HANDLE = -12 +OPENUSB_SYS_FUNC_FAILURE = -13 +OPENUSB_NULL_LIST = -14 +OPENUSB_CB_CONTINUE = -20 +OPENUSB_CB_TERMINATE = -21 +OPENUSB_IO_STALL = -50 +OPENUSB_IO_CRC_ERROR = -51 +OPENUSB_IO_DEVICE_HUNG = -52 +OPENUSB_IO_REQ_TOO_BIG = -53 +OPENUSB_IO_BIT_STUFFING = -54 +OPENUSB_IO_UNEXPECTED_PID = -55 +OPENUSB_IO_DATA_OVERRUN = -56 +OPENUSB_IO_DATA_UNDERRUN = -57 +OPENUSB_IO_BUFFER_OVERRUN = -58 +OPENUSB_IO_BUFFER_UNDERRUN = -59 +OPENUSB_IO_PID_CHECK_FAILURE = -60 +OPENUSB_IO_DATA_TOGGLE_MISMATCH = -61 +OPENUSB_IO_TIMEOUT = -62 +OPENUSB_IO_CANCELED = -63 + +_openusb_errno = { + OPENUSB_SUCCESS:None, + OPENUSB_PLATFORM_FAILURE:None, + OPENUSB_NO_RESOURCES:errno.__dict__.get('ENOMEM', None), + OPENUSB_NO_BANDWIDTH:None, + OPENUSB_NOT_SUPPORTED:errno.__dict__.get('ENOSYS', None), + OPENUSB_HC_HARDWARE_ERROR:errno.__dict__.get('EIO', None), + OPENUSB_INVALID_PERM:errno.__dict__.get('EBADF', None), + OPENUSB_BUSY:errno.__dict__.get('EBUSY', None), + OPENUSB_BADARG:errno.__dict__.get('EINVAL', None), + OPENUSB_NOACCESS:errno.__dict__.get('EACCES', None), + OPENUSB_PARSE_ERROR:None, + OPENUSB_UNKNOWN_DEVICE:errno.__dict__.get('ENODEV', None), + OPENUSB_INVALID_HANDLE:errno.__dict__.get('EINVAL', None), + OPENUSB_SYS_FUNC_FAILURE:None, + OPENUSB_NULL_LIST:None, + OPENUSB_CB_CONTINUE:None, + OPENUSB_CB_TERMINATE:None, + OPENUSB_IO_STALL:errno.__dict__.get('EIO', None), + OPENUSB_IO_CRC_ERROR:errno.__dict__.get('EIO', None), + OPENUSB_IO_DEVICE_HUNG:errno.__dict__.get('EIO', None), + OPENUSB_IO_REQ_TOO_BIG:errno.__dict__.get('E2BIG', None), + OPENUSB_IO_BIT_STUFFING:None, + OPENUSB_IO_UNEXPECTED_PID:errno.__dict__.get('ESRCH', None), + OPENUSB_IO_DATA_OVERRUN:errno.__dict__.get('EOVERFLOW', None), + OPENUSB_IO_DATA_UNDERRUN:None, + OPENUSB_IO_BUFFER_OVERRUN:errno.__dict__.get('EOVERFLOW', None), + OPENUSB_IO_BUFFER_UNDERRUN:None, + OPENUSB_IO_PID_CHECK_FAILURE:None, + OPENUSB_IO_DATA_TOGGLE_MISMATCH:None, + OPENUSB_IO_TIMEOUT:errno.__dict__.get('ETIMEDOUT', None), + OPENUSB_IO_CANCELED:errno.__dict__.get('EINTR', None) +} + +class _usb_endpoint_desc(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)] + +class _usb_interface_desc(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)] + +class _usb_config_desc(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)] + +class _usb_device_desc(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)] + +class _openusb_request_result(Structure): + _fields_ = [('status', c_int32), + ('transfered_bytes', c_uint32)] + +class _openusb_ctrl_request(Structure): + class _openusb_ctrl_setup(Structure): + _fields_ = [('bmRequestType', c_uint8), + ('bRequest', c_uint8), + ('wValue', c_uint16), + ('wIndex', c_uint16)] + _fields_ = [('payload', POINTER(c_uint8)), + ('length', c_uint32), + ('timeout', c_uint32), + ('flags', c_uint32), + ('result', _openusb_request_result), + ('next', c_void_p)] + +class _openusb_intr_request(Structure): + _fields_ = [('interval', c_uint16), + ('payload', POINTER(c_uint8)), + ('length', c_uint32), + ('timeout', c_uint32), + ('flags', c_uint32), + ('result', _openusb_request_result), + ('next', c_void_p)] + +class _openusb_bulk_request(Structure): + _fields_ = [('payload', POINTER(c_uint8)), + ('length', c_uint32), + ('timeout', c_uint32), + ('flags', c_uint32), + ('result', _openusb_request_result), + ('next', c_void_p)] + +class _openusb_isoc_pkts(Structure): + class _openusb_isoc_packet(Structure): + _fields_ = [('payload', POINTER(c_uint8)), + ('length', c_uint32)] + _fields_ = [('num_packets', c_uint32), + ('packets', POINTER(_openusb_isoc_packet))] + +class _openusb_isoc_request(Structure): + _fields_ = [('start_frame', c_uint32), + ('flags', c_uint32), + ('pkts', _openusb_isoc_pkts), + ('isoc_results', POINTER(_openusb_request_result)), + ('isoc_status', c_int32), + ('next', c_void_p)] + +_openusb_devid = c_uint64 +_openusb_busid = c_uint64 +_openusb_handle = c_uint64 +_openusb_dev_handle = c_uint64 + +_lib = None +_ctx = None + +def _load_library(): + libname = ctypes.util.find_library('openusb') + if libname is None: + raise OSError('USB library could not be found') + return CDLL(libname) + +def _setup_prototypes(lib): + # int32_t openusb_init(uint32_t flags , openusb_handle_t *handle); + lib.openusb_init.argtypes = [c_uint32, POINTER(_openusb_handle)] + lib.openusb_init.restype = c_int32 + + # void openusb_fini(openusb_handle_t handle ); + lib.openusb_fini.argtypes = [_openusb_handle] + + # uint32_t openusb_get_busid_list(openusb_handle_t handle, + # openusb_busid_t **busids, + # uint32_t *num_busids); + lib.openusb_get_busid_list.argtypes = [ + _openusb_handle, + POINTER(POINTER(_openusb_busid)), + POINTER(c_uint32) + ] + + # void openusb_free_busid_list(openusb_busid_t * busids); + lib.openusb_free_busid_list.argtypes = [POINTER(_openusb_busid)] + + # uint32_t openusb_get_devids_by_bus(openusb_handle_t handle, + # openusb_busid_t busid, + # openusb_devid_t **devids, + # uint32_t *num_devids); + lib.openusb_get_devids_by_bus.argtypes = [ + _openusb_handle, + _openusb_busid, + POINTER(POINTER(_openusb_devid)), + POINTER(c_uint32) + ] + + lib.openusb_get_devids_by_bus.restype = c_int32 + + # void openusb_free_devid_list(openusb_devid_t * devids); + lib.openusb_free_devid_list.argtypes = [POINTER(_openusb_devid)] + + # int32_t openusb_open_device(openusb_handle_t handle, + # openusb_devid_t devid , + # uint32_t flags, + # openusb_dev_handle_t *dev); + lib.openusb_open_device.argtypes = [ + _openusb_handle, + _openusb_devid, + c_uint32, + POINTER(_openusb_dev_handle) + ] + + lib.openusb_open_device.restype = c_int32 + + # int32_t openusb_close_device(openusb_dev_handle_t dev); + lib.openusb_close_device.argtypes = [_openusb_dev_handle] + lib.openusb_close_device.restype = c_int32 + + # int32_t openusb_set_configuration(openusb_dev_handle_t dev, + # uint8_t cfg); + lib.openusb_set_configuration.argtypes = [_openusb_dev_handle, c_uint8] + lib.openusb_set_configuration.restype = c_int32 + + # int32_t openusb_get_configuration(openusb_dev_handle_t dev, + # uint8_t *cfg); + lib.openusb_get_configuration.argtypes = [_openusb_dev_handle, POINTER(c_uint8)] + lib.openusb_get_configuration.restype = c_int32 + + # int32_t openusb_claim_interface(openusb_dev_handle_t dev, + # uint8_t ifc, + # openusb_init_flag_t flags); + lib.openusb_claim_interface.argtypes = [ + _openusb_dev_handle, + c_uint8, + c_int + ] + + lib.openusb_claim_interface.restype = c_int32 + + # int32_t openusb_release_interface(openusb_dev_handle_t dev, + # uint8_t ifc); + lib.openusb_release_interface.argtypes = [ + _openusb_dev_handle, + c_uint8 + ] + + lib.openusb_release_interface.restype = c_int32 + + # int32_topenusb_set_altsetting(openusb_dev_handle_t dev, + # uint8_t ifc, + # uint8_t alt); + lib.openusb_set_altsetting.argtypes = [ + _openusb_dev_handle, + c_uint8, + c_uint8 + ] + lib.openusb_set_altsetting.restype = c_int32 + + # int32_t openusb_reset(openusb_dev_handle_t dev); + lib.openusb_reset.argtypes = [_openusb_dev_handle] + lib.openusb_reset.restype = c_int32 + + # int32_t openusb_parse_device_desc(openusb_handle_t handle, + # openusb_devid_t devid, + # uint8_t *buffer, + # uint16_t buflen, + # usb_device_desc_t *devdesc); + lib.openusb_parse_device_desc.argtypes = [ + _openusb_handle, + _openusb_devid, + POINTER(c_uint8), + c_uint16, + POINTER(_usb_device_desc) + ] + + lib.openusb_parse_device_desc.restype = c_int32 + + # int32_t openusb_parse_config_desc(openusb_handle_t handle, + # openusb_devid_t devid, + # uint8_t *buffer, + # uint16_t buflen, + # uint8_t cfgidx, + # usb_config_desc_t *cfgdesc); + lib.openusb_parse_config_desc.argtypes = [ + _openusb_handle, + _openusb_devid, + POINTER(c_uint8), + c_uint16, + c_uint8, + POINTER(_usb_config_desc) + ] + lib.openusb_parse_config_desc.restype = c_int32 + + # int32_t openusb_parse_interface_desc(openusb_handle_t handle, + # openusb_devid_t devid, + # uint8_t *buffer, + # uint16_t buflen, + # uint8_t cfgidx, + # uint8_t ifcidx, + # uint8_t alt, + # usb_interface_desc_t *ifcdesc); + lib.openusb_parse_interface_desc.argtypes = [ + _openusb_handle, + _openusb_devid, + POINTER(c_uint8), + c_uint16, + c_uint8, + c_uint8, + c_uint8, + POINTER(_usb_interface_desc) + ] + + lib.openusb_parse_interface_desc.restype = c_int32 + + # int32_t openusb_parse_endpoint_desc(openusb_handle_t handle, + # openusb_devid_t devid, + # uint8_t *buffer, + # uint16_t buflen, + # uint8_t cfgidx, + # uint8_t ifcidx, + # uint8_t alt, + # uint8_t eptidx, + # usb_endpoint_desc_t *eptdesc); + lib.openusb_parse_endpoint_desc.argtypes = [ + _openusb_handle, + _openusb_devid, + POINTER(c_uint8), + c_uint16, + c_uint8, + c_uint8, + c_uint8, + c_uint8, + POINTER(_usb_endpoint_desc) + ] + + lib.openusb_parse_interface_desc.restype = c_int32 + + # const char *openusb_strerror(int32_t error ); + lib.openusb_strerror.argtypes = [c_int32] + lib.openusb_strerror.restype = c_char_p + + # int32_t openusb_ctrl_xfer(openusb_dev_handle_t dev, + # uint8_t ifc, + # uint8_t ept, + # openusb_ctrl_request_t *ctrl); + lib.openusb_ctrl_xfer.argtypes = [ + _openusb_dev_handle, + c_uint8, + c_uint8, + POINTER(_openusb_ctrl_request) + ] + + lib.openusb_ctrl_xfer.restype = c_int32 + + # int32_t openusb_intr_xfer(openusb_dev_handle_t dev, + # uint8_t ifc, + # uint8_t ept, + # openusb_intr_request_t *intr); + lib.openusb_intr_xfer.argtypes = [ + _openusb_dev_handle, + c_uint8, + c_uint8, + POINTER(_openusb_intr_request) + ] + + lib.openusb_bulk_xfer.restype = c_int32 + + # int32_t openusb_bulk_xfer(openusb_dev_handle_t dev, + # uint8_t ifc, + # uint8_t ept, + # openusb_bulk_request_t *bulk); + lib.openusb_bulk_xfer.argtypes = [ + _openusb_dev_handle, + c_uint8, + c_uint8, + POINTER(_openusb_bulk_request) + ] + + lib.openusb_bulk_xfer.restype = c_int32 + + # int32_t openusb_isoc_xfer(openusb_dev_handle_t dev, + # uint8_t ifc, + # uint8_t ept, + # openusb_isoc_request_t *isoc); + lib.openusb_isoc_xfer.argtypes = [ + _openusb_dev_handle, + c_uint8, + c_uint8, + POINTER(_openusb_isoc_request) + ] + + lib.openusb_isoc_xfer.restype = c_int32 + +def _check(retval): + ret = retval.value + if ret != 0: + from usb.core import USBError + raise USBError(_lib.openusb_strerror(ret), ret, _openusb_errno[ret]) + return retval + +class _Context(object): + def __init__(self): + self.handle = _openusb_handle() + _check(_lib.openusb_init(0, byref(self.handle))) + def __del__(self): + _lib.openusb_fini(self.handle) + +class _BusIterator(object): + def __init__(self): + self.buslist = POINTER(openusb_busid)() + num_busids = c_uint32() + _check(_lib.openusb_get_busid_list(_ctx.handle, + byref(self.buslist), + byref(num_busids))) + self.num_busids = num_busids.value + def __iter__(self): + for i in range(self.num_busids): + yield self.buslist[i] + def __del__(self): + _lib.openusb_free_busid_list(self.buslist) + +class _DevIterator(object): + def __init__(self, busid): + self.devlist = POINTER(_openusb_devid)() + num_devids = c_uint32() + _check(_lib.openusb_get_devids_by_bus(_ctx.handle, + busid, + byref(self.devlist), + byref(num_devids))) + self.num_devids = num_devids.value + def __iter__(self): + for i in range(self.num_devids): + yield self.devlist[i] + def __del__(self): + _lib.openusb_free_devid_list(self.devlist) + +class _OpenUSB(usb.backend.IBackend): + @methodtrace(_logger) + def enumerate_devices(self): + for bus in _BusIterator(): + for devid in _DevIterator(bus): + yield devid + + @methodtrace(_logger) + def get_device_descriptor(self, dev): + desc = _usb_device_desc() + _check(_lib.openusb_parse_device_desc(_ctx.handle, + dev, + None, + 0, + byref(desc))) + desc.bus = None + desc.address = None + return desc + + @methodtrace(_logger) + def get_configuration_descriptor(self, dev, config): + desc = _usb_config_desc() + _check(_lib.openusb_parse_config_desc(_ctx.handle, + dev, + None, + 0, + config, + byref(desc))) + return desc + + @methodtrace(_logger) + def get_interface_descriptor(self, dev, intf, alt, config): + desc = _usb_interface_desc() + _check(_lib.openusb_parse_interface_desc(_ctx.handle, + dev, + None, + 0, + config, + intf, + alt, + byref(desc))) + return desc + + @methodtrace(_logger) + def get_endpoint_descriptor(self, dev, ep, intf, alt, config): + desc = _usb_endpoint_desc() + _check(_lib.openusb_parse_endpoint_desc(_ctx.handle, + dev, + None, + 0, + config, + intf, + alt, + ep, + byref(desc))) + return desc + + @methodtrace(_logger) + def open_device(self, dev): + handle = _openusb_dev_handle() + _check(_lib.openusb_open_device(_ctx.handle, dev, 0, byref(handle))) + return handle + + @methodtrace(_logger) + def close_device(self, dev_handle): + _lib.openusb_close_device(dev_handle) + + @methodtrace(_logger) + def set_configuration(self, dev_handle, config_value): + _check(_lib.openusb_set_configuration(dev_handle, config_value)) + + @methodtrace(_logger) + def get_configuration(self, dev_handle): + config = c_uint8() + _check(_lib.openusb_get_configuration(dev_handle, byref(config))) + return config.value + + @methodtrace(_logger) + def set_interface_altsetting(self, dev_handle, intf, altsetting): + _check(_lib.set_altsetting(dev_handle, intf, altsetting)) + + @methodtrace(_logger) + def claim_interface(self, dev_handle, intf): + _check(_lib.openusb_claim_interface(dev_handle, intf, 0)) + + @methodtrace(_logger) + def release_interface(self, dev_handle, intf): + _lib.openusb_release_interface(dev_handle, intf) + + @methodtrace(_logger) + def bulk_write(self, dev_handle, ep, intf, data, timeout): + request = _openusb_bulk_request() + memset(byref(request), 0, sizeof(request)) + request.payload, request.length = data.buffer_info() + request.timeout = timeout + _check(_lib.openusb_bulk_xfer(dev_handle, intf, ep, byref(request))) + return request.transfered_bytes.value + + @methodtrace(_logger) + def bulk_read(self, dev_handle, ep, intf, size, timeout): + request = _openusb_bulk_request() + buffer = array.array('B', '\x00' * size) + memset(byref(request), 0, sizeof(request)) + request.payload, request.length = buffer.buffer_info() + request.timeout = timeout + _check(_lib.openusb_bulk_xfer(dev_handle, intf, ep, byref(request))) + return buffer[:request.transfered_bytes.value] + + @methodtrace(_logger) + def intr_write(self, dev_handle, ep, intf, data, timeout): + request = _openusb_intr_request() + memset(byref(request), 0, sizeof(request)) + payload, request.length = data.buffer_info() + request.payload = cast(payload, POINTER(c_uint8)) + request.timeout = timeout + _check(_lib.openusb_intr_xfer(dev_handle, intf, ep, byref(request))) + return request.transfered_bytes.value + + @methodtrace(_logger) + def intr_read(self, dev_handle, ep, intf, size, timeout): + request = _openusb_intr_request() + buffer = array.array('B', '\x00' * size) + memset(byref(request), 0, sizeof(request)) + payload, request.length = buffer.buffer_info() + request.payload = cast(payload, POINTER(c_uint8)) + request.timeout = timeout + _check(_lib.openusb_intr_xfer(dev_handle, intf, ep, byref(request))) + return buffer[:request.transfered_bytes.value] + +# TODO: implement isochronous +# @methodtrace(_logger) +# def iso_write(self, dev_handle, ep, intf, data, timeout): +# pass + +# @methodtrace(_logger) +# def iso_read(self, dev_handle, ep, intf, size, timeout): +# pass + + @methodtrace(_logger) + def ctrl_transfer(self, + dev_handle, + bmRequestType, + bRequest, + wValue, + wIndex, + data_or_wLength, + timeout): + request = _openusb_ctrl_request() + request.setup.bmRequestType = bmRequestType + request.setup.bRequest = bRequest + request.setup.wValue + request.setup.wIndex + request.timeout = timeout + + direction = usb.util.ctrl_direction(bmRequestType) + + if direction == ENDPOINT_OUT: + buffer = data_or_wLength + else: + buffer = array.array('B', '\x00' * data_or_wLength) + + payload, request.length = buffer.buffer_info() + request.payload = cast(payload, POINTER(c_uint8)) + + ret = _check(_lib.openusb_ctrl_xfer(dev_handle, 0, 0, byref(request))) + + if direction == ENDPOINT_OUT: + ret + else: + buffer[:ret] + + @methodtrace(_logger) + def reset_device(self, dev_handle): + _check(_lib.openusb_reset(dev_handle)) + +def get_backend(): + try: + global _lib, _ctx + if _lib is None: + _lib = _load_library() + _setup_prototypes(_lib) + _ctx = _Context() + return _OpenUSB() + except Exception: + _logger.error('Error loading OpenUSB backend', exc_info=True) + return None |