linux-kernel - RE: [PATCH v6 13/14] platform/x86: wmi: create character devices when requested by drivers

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Date:   Tue, 10 Oct 2017 13:41:45 +0000
From:   <Mario.Limonciello@...l.com>
To:     <greg@...ah.com>
CC:     <dvhart@...radead.org>, <andy.shevchenko@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <luto@...nel.org>,
        <quasisec@...gle.com>, <pali.rohar@...il.com>, <rjw@...ysocki.net>,
        <mjg59@...gle.com>, <hch@....de>
Subject: RE: [PATCH v6 13/14] platform/x86: wmi: create character devices when
 requested by drivers

> -----Original Message-----
> From: Greg KH [mailto:greg@...ah.com]
> Sent: Tuesday, October 10, 2017 6:07 AM
> To: Limonciello, Mario <Mario_Limonciello@...l.com>
> Cc: dvhart@...radead.org; Andy Shevchenko <andy.shevchenko@...il.com>;
> LKML <linux-kernel@...r.kernel.org>; platform-driver-x86@...r.kernel.org;
> Andy Lutomirski <luto@...nel.org>; quasisec@...gle.com;
> pali.rohar@...il.com; rjw@...ysocki.net; mjg59@...gle.com; hch@....de
> Subject: Re: [PATCH v6 13/14] platform/x86: wmi: create character devices when
> requested by drivers
> 
> On Mon, Oct 09, 2017 at 05:51:51PM -0500, Mario Limonciello wrote:
> > --- /dev/null
> > +++ b/include/uapi/linux/wmi.h
> > @@ -0,0 +1,19 @@
> > +/*
> > + *  User API methods for ACPI-WMI mapping driver
> > + *
> > + *  Copyright (C) 2017 Dell, Inc.
> > + *
> > + *  This program is free software; you can redistribute it and/or modify
> > + *  it under the terms of the GNU General Public License version 2 as
> > + *  published by the Free Software Foundation.
> > + */
> > +#ifndef _UAPI_LINUX_WMI_H
> > +#define _UAPI_LINUX_WMI_H
> > +
> > +#define WMI_IOC 'W'
> > +#define WMI_IO(instance)		_IO(WMI_IOC, instance)
> > +#define WMI_IOR(instance, type)		_IOR(WMI_IOC, instance, type)
> > +#define WMI_IOW(instance, type)		_IOW(WMI_IOC, instance, type)
> > +#define WMI_IOWR(instance, type)	_IOWR(WMI_IOC, instance, type)
> 
> Are these really needed in a uapi .h file?  Who needs them?  And why not
> just use a "normal" ioctl macro in your individual driver .h file?  Do
> these really help?
> 
Since this is setting precedent that WMI drivers will use the IOC 'W' and the WMI
bus driver will dispatch calls to the proper drivers, I think they make sense to include.

I'm a little unclear - do you disagree?  Or do you just think I need to include a comment
in the header file with this information?

Thanks,