linux-kernel - Re: (3) [PATCH v2] input: add 2 kind of switch

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Message-ID: <20201030114142.GA2409436@kroah.com>
Date:   Fri, 30 Oct 2020 12:41:42 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Jungrae Kim <jryu.kim@...sung.com>
Cc:     HyungJae Im <hj2.im@...sung.com>,
        "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "rydberg@...math.org" <rydberg@...math.org>
Subject: Re: (3) [PATCH v2] input: add 2 kind of switch

On Fri, Oct 30, 2020 at 08:28:12PM +0900, Jungrae Kim wrote:
> > On Fri, Oct 30, 2020 at 01:39:16PM +0900, HyungJae Im wrote:
> > > Hello, This is Hyungjae Im from Samsung Electronics.
> > > Let me answer your questions inline.
> > > 
> > > >On Thu, Oct 29, 2020 at 10:27:47PM +0900, HyungJae Im wrote:
> > > >> From: "hj2.im" <hj2.im@...sung.com>
> > > >> Date: Thu, 29 Oct 2020 22:11:24 +0900
> > > >> Subject: [PATCH v2] input: add 2 kind of switch
> > > > 
> > > >Why is this in the body of that patch?
> > > 
> > > I read "how to send your first kernel patch", but still making so many mistakes.
> > > I will be cautious with this.
> > >  
> > > >> 
> > > >> We need support to various accessories on the device,
> > > >> some switch does not exist in switch list.
> > > >> So added switch for the following purpose.
> > > >> 
> > > >> SW_COVER_ATTACHED is for the checking the cover
> > > >> attached or not on the device. SW_EXT_PEN_ATTACHED is for the
> > > >> checking the external pen attached or not on the device
> > > > 
> > > >You didn't answer the previous question as to why the existing values do
> > > >not work for you instead of having to create new ones?
> > > 
> > >  I think I should clarify this part the most for this review.
> > >  As you know, new added events both has similar existing events,
> > >  but it has to operate separately.
> > > 
> > >  First, SW_COVER_ATTACHED is similar with SW_MACHINE_COVER.
> > >  We need two events for our cover interaction.
> > >  One is to detect if flip cover is open/closed(covers screen or not),
> > >  and one is for detecting if cover is attached(detect if device is put into cover).
> > >  With the second event, we send event for attachment and start authentication
> > >  distinguishing if it was Samsung made cover.
> > > 
> > >  Second, SW_EXT_PEN_ATTACHED detects if pen is attached externally on tablet models.
> > >  It is different with SW_PEN_INSERTED since this is detecting pens like our NOTE series.
> > >  SW_EXT_PEN_ATTACHED has an unique role to set wacom tuning table differently
> > >  while pen is attached/detached.
> >  
> > All of that needs to go in the changelog text for the individual patches
> > when you submit them.
> >  
> > But as Dmitry pointed out, it doesn't look like either of these drivers
> > are needed at all, just use the gpio-keys driver instead.
> >  
> > thanks,
> >  
> > greg k-h
>  
> Can you accept V1 patch? or need to add a change of device tree?

What is "v1" patch?  Do you have a pointer to it on lore.kernel.org?

> Please let me know what do I do now. 

What is wrong with just using a device tree entry for the gpio-keys
driver instead?

thanks,

greg k-h