linux-kernel - Re: char interface to sdio, chdio.c

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Date:	Wed, 16 Jul 2014 16:11:46 -0700
From:	Greg KH <greg@...ah.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Alexander Kolesnikov <akolesni@...eaurora.org>,
	Konstantin Dorfman <kdorfman@...eaurora.org>
Subject: Re: char interface to sdio, chdio.c

On Wed, Jul 16, 2014 at 04:08:11PM -0700, Stephen Boyd wrote:
> On 07/16/14 12:38, Stephen Boyd wrote:
> > On 07/16/14 11:44, Greg KH wrote:
> >> My specific question is why 2 different interfaces?
> > Ok. It definitely looks odd to support set/get of the VDD with sysfs and
> > ioctl interfaces. I'm just guessing, but I suspect it's a permissions
> > thing given that the patch that introduces the VDD stuff also updates
> > the permissions of the device node. Of course, the commit text only
> > mentions an ioctl, nothing about sysfs. The only other sysfs stuff seems
> > to be module parameters to change the vendor ids.
> >
> > I'll have to go repo diving to figure out if the sysfs interface was
> > ever used. Maybe Alex or Konstantin can respond before I have to do that.
> >
> >
> 
> I couldn't find any usage of the sysfs interface. The only thing I see
> used is the host_name field when the module is inserted, if that even
> happens at all (I'm not sure because it's behind some ifdef that may or
> may not be defined). Sorry this doesn't explain why there are two
> different interfaces for the VDD stuff. Hopefully Alex or Konstantin can
> help.

Thanks for looking.

Alex and/or Konstantin, any objection to me removing the sysfs interface
on this driver, and just using the char device ioctl hellhole^WAPI
instead?

thanks,

greg k-h
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