Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

proc_usb_info.txt: Correct documentation about endianness of config descriptors

Browse source 
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: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2013-08-03 16:37:49 +02:00 committed by Greg Kroah-Hartman
parent b4f17a488a
commit 21a9631586
1 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
Documentation/usb/proc_usb_info.txt
View file

@ -54,9 +54,12 @@ it and 002/048 sometime later.
These files can be read as binary data. The binary data consists
of first the device descriptor, then the descriptors for each
configuration of the device. Multi-byte fields in the device and
configuration descriptors, but not other descriptors, are converted
to host endianness by the kernel. This information is also shown
configuration of the device. Multi-byte fields in the device descriptor
are converted to host endianness by the kernel. The configuration
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.
These files may also be used to write user-level drivers for the USB