linux-kernel - Re: [PATCH] input: add driver support for Sharp gp2ap002a00f proximity sensor

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Date:	Fri, 11 Nov 2011 10:06:16 +0100
From:	<oskar.andero@...yericsson.com>
To:	Jonathan Cameron <jic23@...nel.org>
CC:	"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"aghayal@...eaurora.org" <aghayal@...eaurora.org>,
	"Cavin, Courtney" <Courtney.Cavin@...yericsson.com>
Subject: Re: [PATCH] input: add driver support for Sharp gp2ap002a00f
 proximity sensor

Hi Jonathan,

Thanks for reviewing!

> ALS sensor in input?  Please see all the previous discussions about
> this.  I'm guessing you are aware of this given you cc'd me though!

Actually, this chip only has a hardwired ALS, meaning nothing is
exposed through the input interfaces.

> Having read driver, this is a proximity switch. Basically it's a button.
> The interface used should reflect this rather than pretending you are
> outputing an ABS value.  Hence this one probably does fit squarely in
> input, but that's for Dmitry to comment on.

Yes, I agree.

> Also, irq fields contain irqs not gpios + the two gpio related pdata
> functions need justification.
> 
> Various small points inline.

> > --- /dev/null
> > +++ b/include/linux/gp2ap002a00f.h
> > @@ -0,0 +1,13 @@
> > +#ifndef _GP2AP002A00F_H_
> > +#define _GP2AP002A00F_H_
> > +
> What is this doing in the header?
> > +#define GP2A_I2C_NAME   "gp2ap002a00f"

This is used for setting up the I2C_BOARD_INFO() in the board file. I
grepped linux/input and found some other drivers doing the same, but if this
is not common practice I can of course move the define to the .c-file.

I'll prepare v2 based on the rest of your comments!

Thanks!

-Oskar
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