This file is indexed.

/lib/udev/hwdb.d/20-sdio-classes.hwdb is in udev 237-3ubuntu10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This file is part of systemd.
#
# Data imported from: hwdb/sdio.ids

sdio:c00v*d*
 ID_SDIO_CLASS_FROM_DATABASE=Not a SDIO standard interface

sdio:c01v*d*
 ID_SDIO_CLASS_FROM_DATABASE=UART standard interface

sdio:c02v*d*
 ID_SDIO_CLASS_FROM_DATABASE=Bluetooth Type-A standard interface

sdio:c03v*d*
 ID_SDIO_CLASS_FROM_DATABASE=Bluetooth Type-B standard interface

sdio:c04v*d*
 ID_SDIO_CLASS_FROM_DATABASE=GPS standard interface

sdio:c05v*d*
 ID_SDIO_CLASS_FROM_DATABASE=Camera standard interface

sdio:c06v*d*
 ID_SDIO_CLASS_FROM_DATABASE=PHS standard interface

sdio:c07v*d*
 ID_SDIO_CLASS_FROM_DATABASE=WLAN interface

sdio:c08v*d*
 ID_SDIO_CLASS_FROM_DATABASE=Embedded SDIO-ATA standard interface

sdio:c09v*d*
 ID_SDIO_CLASS_FROM_DATABASE=Bluetooth AMP standard interface