linux-kernel - Re: [PATCH 001/001] hid-sony.c: add sysfs provisioning

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Message-Id: <20141118234349.7b44949197898390d496f1cd@ao2.it>
Date:	Tue, 18 Nov 2014 23:43:49 +0100
From:	Antonio Ospite <ao2@....it>
To:	bri <bri@...ij.org>
Cc:	Frank Praznik <frank.praznik@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Henrik Rydberg <rydberg@...omail.se>,
	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 001/001] hid-sony.c: add sysfs provisioning

On Mon, 17 Nov 2014 21:01:44 -0500
bri <bri@...ij.org> wrote:

> On Mon, Nov 17, 2014 at 01:35:18PM +0100, Antonio Ospite wrote:
> > I had tried doing something similar in the past (the parsing was just a
> > sscanf): http://thread.gmane.org/gmane.linux.bluez.kernel/5261 but then
> > we deliberately decided against exposing specific sysfs interfaces for
> > device/master_bdaddr, you can just use generic HID feature reports from
> > userspace to get/set these, write a simple program reusing the code in
> > the BlueZ sixaxis plugin, using the ioclts
> > HIDIOCGFEATURE/HIDIOCSFEATURE, this way you don't depend on libusb. As
> > an historical note, the BlueZ sixaxis plugin was one of the first user
> > of these ioctls.
> 
> ...
> 
> > That said I still don't think the changes you are proposing are strictly
> > necessary in the kernel driver, but let's see what the others have to
> > say about that.
> 
> On Mon, Nov 17, 2014 at 02:39:35PM -0500, Frank Praznik wrote:
> > Agreed, I don't see a need for exposing this as a sysfs entry since it's
> > easy enough to use hidraw and an ioctl call to set/get the master address.
> 
> For this argument I would offer that "easy" is different for you or I
> working on a development system than for a less versed person working
> to personally customize an appliance that didn't come with a gcc package,
> but probably did come with /bin/sh.
> 

If you can upload a shell script to the target system you may as well
upload a static binary; and if you can use a modified kernel you can
compile _for_ the target even if not _on_ the target.

And if you need help to write the program which uses the HID ioctls
just ask :)

Ciao,
   Antonio

-- 
Antonio Ospite
http://ao2.it

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
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