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Commit 21a96315 authored by Hans de Goede's avatar Hans de Goede Committed by Greg Kroah-Hartman
Browse files

proc_usb_info.txt: Correct documentation about endianness of config descriptors 



The config descriptors as read from /proc/bus/usb/BBB/DDD are in *bus* endian
format. Correct proc_usb_info.txt to correctly reflect that.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b4f17a48

Documentation/usb/proc_usb_info.txt

+6 −3
Original line number Original line Diff line number Diff line
@@ -54,9 +54,12 @@ it and 002/048 sometime later. 




These files can be read as binary data.  The binary data consists

These files can be read as binary data.  The binary data consists

of first the device descriptor, then the descriptors for each

of first the device descriptor, then the descriptors for each

configuration of the device.  Multi-byte fields in the device and

configuration of the device.  Multi-byte fields in the device descriptor

configuration descriptors, but not other descriptors, are converted

are converted to host endianness by the kernel.  The configuration

to host endianness by the kernel.  This information is also shown

descriptors are in bus endian format! The configuration descriptor

are wTotalLength bytes apart. If a device returns less configuration

descriptor data than indicated by wTotalLength there will be a hole in

the file for the missing bytes.  This information is also shown

in text form by the /proc/bus/usb/devices file, described later.

in text form by the /proc/bus/usb/devices file, described later.





These files may also be used to write user-level drivers for the USB

These files may also be used to write user-level drivers for the USB