linux-kernel - [PATCH v3 0/1] HID: Report Descriptor in Sysfs

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Date:	Sun, 23 Jan 2011 19:36:16 -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 v3 0/1] HID: Report Descriptor in Sysfs

This is version 3 of the patch, with binary data in the sysfs file instead
of ASCII, as suggested by Alan Stern and Greg KH.  Also now with
documentation.

Original Description:

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.

 Documentation/ABI/testing/sysfs-driver-hid |   10 ++++++++
 drivers/hid/hid-core.c                     |   33 ++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-hid

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