FabienM at 14:33, 20 July 2018

2018-07-20T14:33:19Z

FabienM: Created page with "

 #!/usr/bin/python # vim: set ts=4 sw=4 expandtab syntax=python: """  FTDI device permission fixer  Can be called from a udev rule to ensure connected FTDI devices have w..."

2018-07-20T14:32:56Z

Created page with "<pre> #!/usr/bin/python # vim: set ts=4 sw=4 expandtab syntax=python: """ FTDI device permission fixer Can be called from a udev rule to ensure connected FTDI devices have w..."

New page

<pre>
#!/usr/bin/python
# vim: set ts=4 sw=4 expandtab syntax=python:
"""

FTDI device permission fixer

Can be called from a udev rule to ensure connected FTDI devices have
world-writable permissions for use by user applications

J. Hipps <jacob@ycnrg.org>
https://ycnrg.org/

"""

import os
import sys
import usb1

def find_usb_device(vid, pid):
"""locate usb device with libusb"""
usb = usb1.USBContext()
for tdev in usb.getDeviceList():
if tdev.getVendorID() == vid and tdev.getProductID() == pid:
n_bus = tdev.getBusNumber()
n_dev = tdev.getDeviceAddress()
n_port = tdev.getPortNumber()
return (n_bus, n_dev)
return None

def fix_dev_perms(bus, dev):
"""fix perms for entry in /dev/bus"""
db_path = '/dev/bus/usb/%03d/%03d' % (bus, dev)
try:
os.stat(db_path)
except Exception as e:
print("Entry not accessible [%s]: %s" % (db_path, str(e)))
return False
try:
os.chmod(db_path, 0o0666)
except Exception as e:
print("Failed to update perms for %s: %s" % (db_path, str(e)))
return False
return True

def _main():
"""entry point"""
if 'ID_VENDOR_ID' in os.environ and 'ID_MODEL_ID' in os.environ:
try:
d_vid = int(os.environ['ID_VENDOR_ID'], 16)
d_pid = int(os.environ['ID_MODEL_ID'], 16)
except:
print("Failed to convert values from env")
sys.exit(2)
else:
if len(sys.argv) < 3:
print("usage: ftdi_fixer.py [VENDOR_ID PRODUCT_ID]")
sys.exit(1)
try:
d_vid = int(sys.argv[1], 16)
d_pid = int(sys.argv[2], 16)
except:
print("Failed to convert hex values")
sys.exit(2)

udev = find_usb_device(d_vid, d_pid)

if udev:
fix_dev_perms(*udev)
else:
print("Failed to locate device")
sys.exit(1)
sys.exit(0)

if __name__ == '__main__':
_main()

</pre>

← Older revision		Revision as of 14:33, 20 July 2018
Line 1:		Line 1:
		+	Sources from [https://ycc.io/scripts/ftdi_fixer.py here]
		+
	<pre>		<pre>
	#!/usr/bin/python		#!/usr/bin/python

Ftdi fixer.py - Revision history

FabienM at 14:33, 20 July 2018

FabienM: Created page with "
#!/usr/bin/python # vim: set ts=4 sw=4 expandtab syntax=python: """ FTDI device permission fixer Can be called from a udev rule to ensure connected FTDI devices have w..."