linux-kernel - Re: [RFC PATCH 02/06] input/rmi4: Core files

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Date:	Thu, 11 Oct 2012 17:37:15 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Christopher Heiny <Cheiny@...aptics.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Input <linux-input@...r.kernel.org>,
	Allie Xiong <axiong@...aptics.com>,
	Vivian Ly <vly@...aptics.com>,
	Daniel Rosenberg <daniel.rosenberg@...aptics.com>,
	Joerie de Gram <j.de.gram@...il.com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Naveen Kumar Gaddipati <naveen.gaddipati@...ricsson.com>,
	Alexandra Chin <alexandra.chin@...synaptics.com>
Subject: Re: [RFC PATCH 02/06] input/rmi4: Core files

On Thu, Oct 11, 2012 at 6:15 AM, Christopher Heiny <Cheiny@...aptics.com> wrote:
> On Thursday, October 11, 2012 02:21:53 AM I wrote:

>> > +union pdt_properties {
>> > +       struct {
>> > +               u8 reserved_1:6;
>> > +               u8 has_bsr:1;
>> > +               u8 reserved_2:1;
>> > +       } __attribute__((__packed__));
>> > +       u8 regs[1];
>>
>> I don't understand what this union is trying to achieve.
>>
>> regs[1] does not look right considering what you're trying to
>> achieve. Since the above fields require a regs[2] (9 bits!)
>> to be stored. Maybe write out what you're trying to do here
>> so I can understand it? (If everyone else in the world gets
>> it immediately, it's maybe me that need fixing instead...)
>>
>> Apart from these remarks it's looking real nice now!
>
> I only count 8 bits there, unless there's something about
> packing I'm not aware of.  Is there something else you
> found confusing about the union?

I just did bad maths, too many figured in the struct...

But consider Dmitry's suggestion that you might get rid
of this unionizing.

Yours,
Linus Walleij
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