linux-kernel - Re: [RFC PATCH 0/3] introduce: Multistate Switch Class

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Date:	Wed, 30 Nov 2011 15:25:29 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	NeilBrown <neilb@...e.de>, MyungJoo Ham <myungjoo.ham@...il.com>,
	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mike Lockwood <lockwood@...roid.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Donggeun Kim <dg77.kim@...sung.com>, Greg KH <gregkh@...e.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Kalle Komierowski <karl.komierowski@...ricsson.com>,
	Johan PALSSON <johan.palsson@...ricsson.com>,
	Daniel WILLERUD <daniel.willerud@...ricsson.com>
Subject: Re: [RFC PATCH 0/3] introduce: Multistate Switch Class

On Wed, Nov 30, 2011 at 11:17:41PM +0000, Mark Brown wrote:
> On Thu, Dec 01, 2011 at 09:56:33AM +1100, NeilBrown wrote:
> > On Wed, 30 Nov 2011 15:40:48 +0900 MyungJoo Ham <myungjoo.ham@...il.com>
> > wrote:
> 
> > > I'm focusing on an external connector or port that each physical port
> > > may inhabit multiple cables at a time although it should support a
> > > port that may inhabit a single cable only at a time. However, the
> > > class could be used for other general "multistate mux" that connects
> > > different device drivers.
> 
> >  maybe I'm just slow, but I'm having a lot of trouble imagining a single port
> >  that could have multiple cables plugged in at the same time.  And this
> >  blockage is stopping me from reflecting usefully on your other points.
> 
> >  Are you able to show me a picture or a diagram or something so I can
> >  visualise what you are talking about?
> >  To me: once you plug one cable into a port, it is full and there is no room
> >  for any more cables.
> 
> One obvious example is the sort of big multi-way docking connector that
> many mobile devices have (iPod and friends being one of the most
> common).  These are essentially the same as docking station connections
> on a laptop in terms of what they bring out - a variety of audio, video
> and communication connections - which may go to a docking station or
> some kind of breakout or adaptor cable and may have sub-ports hanging
> off them (eg, it's common for tablets to have docking stations with HDMI
> and audio sockets on them).
> 
> There are also lower pin count equivalents like the multiplexed "USB"
> sockets on some phones which can also carry other functions with
> adaptors, and even something like a headset is really a microphone and
> headphones on a single jack.

Physical jack does not have to map 1:1 on logical jack. So 1 physical
docking connector can be represented by 1 logical video connector, line
in, line out, microphone and maybe else.

-- 
Dmitry
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