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Fix detection of USB strings for composite devices

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This commit is contained in:
Kovid Goyal 2016-02-01 22:37:26 +05:30
parent cc39ed3ba1
commit 85b91e4c75
1 changed files with 7 additions and 11 deletions
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16
src/calibre/devices/winusb.py
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@ -717,7 +717,7 @@ def get_drive_letters_for_device(usbdev, storage_number_map=None, debug=False):
else:
return get_drive_letters_for_device_single(usbdev, sn_map, debug=debug)
def get_drive_letters_for_device_single(usbdev, storage_number_map, debug=False): # {{{
def get_drive_letters_for_device_single(usbdev, storage_number_map, debug=False):
ans = {'pnp_id_map': {}, 'drive_letters':[], 'readonly_drives':set(), 'sort_map':{}}
descendants = frozenset(iterdescendants(usbdev.devinst))
for devinfo, devpath in DeviceSet(GUID_DEVINTERFACE_DISK).interfaces():
@ -829,18 +829,14 @@ def get_usb_info(usbdev, debug=False): # {{{
:param usbdev: A usb device as returned by :function:`scan_usb_devices`
'''
ans = {}
try:
parent = next(iterancestors(usbdev.devinst))
except StopIteration:
if debug:
prints('Cannot get USB info as device has no parent (was probably disconnected)')
return ans
for devinfo, parent_path in DeviceSet(guid=GUID_DEVINTERFACE_USB_HUB).interfaces():
if devinfo.DevInst == parent:
hub_map = {devinfo.DevInst:path for devinfo, path in DeviceSet(guid=GUID_DEVINTERFACE_USB_HUB).interfaces()}
for parent in iterancestors(usbdev.devinst):
parent_path = hub_map.get(parent)
if parent_path is not None:
break
else:
if debug:
prints('Cannot get USB info as parent of device is not a HUB')
prints('Cannot get USB info as parent of device is not a HUB or device has no parent (was probably disconnected)')
return ans
for devlist, devinfo in DeviceSet(guid=GUID_DEVINTERFACE_USB_DEVICE).devices():
if devinfo.DevInst == usbdev.devinst: