Re: [PATCH] HID: Add Support for Setting and Getting FeatureReports from hidraw

From: Antonio Ospite
Date: Tue Jun 08 2010 - 02:42:56 EST

On Mon, 7 Jun 2010 23:51:48 -0400
Alan Ott <alan@xxxxxxxxxxx> wrote:

> Per the HID Specification, Feature reports must be sent and received on
> the Configuration endpoint (EP 0) through the Set_Report/Get_Report
> interfaces. This patch adds two ioctls to hidraw to set and get feature
> reports to and from the device. Modifications were made to hidraw and
> usbhid.
> New hidraw ioctls:
> HIDIOCSFEATURE - Perform a Set_Report transfer of a Feature report.
> HIDIOCGFEATURE - Perform a Get_Report transfer of a Feature report.
> Signed-off-by: Alan Ott <alan@xxxxxxxxxxx>
> ---

Thanks Alan, I am going to test this quite soon.

TBH, when I was thinking about how to extend hidraw I thought we could
have added a new report_type field to struct hidraw_report_descriptor,
in order to re-use the HIDIOCGRDESC ioctl handler itself, adding then a
HIDIOCSRDESC for setting the report. This looked cleaner to my eyes,
but I didn't actually implement this, so I don't know if it was
feasible, for instance one problem I didn't investigate further was
about the default value of the aforementioned report_type field in
order to keep the current behavior of HIDIOCGRDESC.


Antonio Ospite

PGP public key ID: 0x4553B001

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

Attachment: pgp00000.pgp
Description: PGP signature