What are the differences between ID_SERIAL and ID_SERIAL_SHORT udev properties. How udev is assigning values for these 2 udev property IDs. I am writing USB driver and I am using udev_device_get_property_value() method to get values for udev properties. in this case I can see there are 2 similar attributes as mentioned above. I couldn't find an explaining document for these information.
what is the difference between ID_SERIAL and ID_SERIAL_SHORT udev attributes for a USB descriptor
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The
ID_SERIAL_SHORTvalue comes from theiSerialstring (if present) in the USB device descriptor. TheID_SERIALvalue is constructed in software and made up from various strings (vendor or manufacturer, model or product, and serial number if present) separated with_.You can use
udevadm info [DEVPATH|FILE]command to look at the udev properties (specifying a specificDEVPATHorFILEas appropriate).