Messages in this thread | | | Date | Wed, 30 Nov 2011 15:25:29 -0800 | From | Dmitry Torokhov <> | Subject | Re: [RFC PATCH 0/3] introduce: Multistate Switch Class |
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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@gmail.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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