linux-kernel - RE: [PATCH v5 1/2] platform/x86: dell-privacy: Add support for Dell hardware privacy

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Date:   Tue, 23 Mar 2021 06:19:09 +0000
From:   "Yuan, Perry" <Perry.Yuan@...l.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "pobrn@...tonmail.com" <pobrn@...tonmail.com>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>,
        "oder_chiou@...ltek.com" <oder_chiou@...ltek.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "mgross@...ux.intel.com" <mgross@...ux.intel.com>,
        "Limonciello, Mario" <Mario.Limonciello@...l.com>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>
Subject: RE: [PATCH v5 1/2] platform/x86: dell-privacy: Add support for Dell
 hardware privacy

Hi Randy.

> -----Original Message-----
> From: Randy Dunlap <rdunlap@...radead.org>
> Sent: Tuesday, March 23, 2021 1:15 AM
> To: Yuan, Perry; pobrn@...tonmail.com; pierre-
> louis.bossart@...ux.intel.com; oder_chiou@...ltek.com; perex@...ex.cz;
> tiwai@...e.com; hdegoede@...hat.com; mgross@...ux.intel.com;
> Limonciello, Mario
> Cc: lgirdwood@...il.com; broonie@...nel.org; alsa-devel@...a-project.org;
> linux-kernel@...r.kernel.org; platform-driver-x86@...r.kernel.org
> Subject: Re: [PATCH v5 1/2] platform/x86: dell-privacy: Add support for Dell
> hardware privacy
> 
> 
> [EXTERNAL EMAIL]
> 
> On 3/22/21 2:38 AM, Perry Yuan wrote:
> > From: Perry Yuan <perry_yuan@...l.com>
> >
> 
> > diff --git a/drivers/platform/x86/dell/Kconfig
> > b/drivers/platform/x86/dell/Kconfig
> > index e0a55337f51a..0e0f1eb35bd6 100644
> > --- a/drivers/platform/x86/dell/Kconfig
> > +++ b/drivers/platform/x86/dell/Kconfig
> > @@ -204,4 +204,20 @@ config DELL_WMI_SYSMAN
> >  	  To compile this driver as a module, choose M here: the module will
> >  	  be called dell-wmi-sysman.
> >
> > +config DELL_PRIVACY
> > +	tristate "Dell Hardware Privacy Support"
> > +	depends on ACPI
> > +	depends on ACPI_WMI
> > +	depends on INPUT
> > +	depends on DELL_LAPTOP
> > +	depends on LEDS_TRIGGER_AUDIO
> > +	select DELL_WMI
> > +	help
> > +	  This driver provides support for the "Dell Hardware Privacy" feature
> > +	  of Dell laptops.
> > +	  Support for a micmute and camera mute privacy will be provided as
> 
> better:
> 	                                                are provided as
> 
> > +	  hardware button Ctrl+F4 and Ctrl+F9 hotkey.
> 
> Does that say that Ctrl+F4 is a hardware button and that Ctrl+F9 is a hotkey?
> If so, what's the difference? and why?  Are they different hardware
> implementations?  Does the user care?

They all use the Ctrl button,
Ctrl +F4 requires that  the Ctrl button and F4 button are pressed at the same time. F9+ctrl also have the same meaning.
They are belonging to same hardware privacy solution, just use different keys combination to activate different privacy function .

> 
> > +
> > +	  To compile this driver as a module, choose M here: the module will
> > +	  be called dell_privacy.
> >  endif # X86_PLATFORM_DRIVERS_DELL
> thanks.
> --
> ~Randy