linux-kernel - Re: [PATCH 2/4] Input: introduce ABS

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Message-ID: <20131218163630.GA30922@core.coreip.homeip.net>
Date:	Wed, 18 Dec 2013 08:36:30 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	Antonio Ospite <ospite@...denti.unina.it>,
	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Input Tools <input-tools@...ts.freedesktop.org>
Subject: Re: [PATCH 2/4] Input: introduce ABS_MAX2/CNT2 and friends

On Wed, Dec 18, 2013 at 03:44:48PM +0100, David Herrmann wrote:
> >>
> >>  /*
> >> + * Due to API restrictions the legacy evdev API only supports ABS values up to
> >> + * ABS_MAX/CNT. Use the extended *ABS2 ioctls to operate on any ABS values in
> >> + * between ABS_MAX and ABS_MAX2.
> >> + */
> >> +#define ABS_MAX2             0x3f
> >> +#define ABS_CNT2             (ABS_MAX2+1)
> >> +
> >
> > Maybe it's just my English, but when you say "between ABS_MAX and
> > ABS_MAX2" it sounds like the old protocol still _must_ be used for
> > values <= ABS_MAX.
> >
> > IIUC this is true "only" for compatibility with older kernels right?
> > If a program decides to support only newer kernels it can check the
> > protocol version and use only the new ioctls, right?
> >
> > Maybe you can be more explicit about that in the comment?
> 
> See the comment on "struct input_absinfo2". It describes the API, this
> comment just describes the ABS_* values. But if anyone has a better
> phrase to use here, I will gladly adjust it.

"Use the extended *ABS2 ioctls to access the full range of ABS values
supported by the kernel."

?

-- 
Dmitry
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