linux-kernel - [PATCH v2 0/1] HID: Report Descriptor in Sysfs

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Date:	Sun, 23 Jan 2011 17:35:06 -0500
From:	Alan Ott <alan@...nal11.us>
To:	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, greg@...ah.com,
	stern@...land.harvard.edu, libusb-devel@...ts.sourceforge.net
Cc:	Alan Ott <alan@...nal11.us>
Subject: [PATCH v2 0/1] HID: Report Descriptor in Sysfs

This is version 2 of the patch, with binary data in the sysfs file instead
of ASCII, as suggested by Alan Stern and Greg KH.

So I'd like to have access to the HID report descriptor in a sysfs entry, so
I can read it without opening the device.  hid-core seemed like the place to
put it.

Using the /sys/class links, for hidraw devices, this puts a new file,
report_descriptor in the directory:
	/sys/class/hidraw/hidraw0/device/

For my USB device (for example), the new file is in:
	/sys/bus/usb/devices/1-5.3:1.0/0003:046D:C216.0001/

For my Bluetooth device, the new file is in:
	/sys/class/bluetooth/hci0/hci0:11/0005:054C:0268.0002/

I'm not super confident that these file locations are the best place, but I
made a best guess so that it could be discussed.  The current location is
where the hid-core stuff lives.  Is there a reason these directories are
named bus:vendor:product:id (instead of hid-core or something similar)?  Is
there a better way to do this?

Alan.

Alan Ott (1):
  hid: Add HID Report Descriptor to sysfs.

 drivers/hid/hid-core.c |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

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