[alsa-devel] [PATCH 2/2] ALSA: Integrate control based jack reporting with core jack reporting
broonie at opensource.wolfsonmicro.com
Thu Feb 16 20:59:09 CET 2012
On Tue, Feb 14, 2012 at 09:29:27AM +0800, Raymond Yau wrote:
I really shouldn't have ot remind you to not remove people from the CC
list, this is really basic stuff...
> 1) The problem of core jack api which is tailor made for embedded
> device, it assume there is only one sound card
This is not the case at all, there is no such assumption and indeed many
embedded devices have multiple sound cards.
> when the desktop computer have more than one sound cards which have jack detect
> there is no mapping to which sound card has the events.
The jack device is a child of the sound card, userspace can look at the
parent to see which sound card a given jack is associated with.
> 2) if the objective of adding jack detection is for trapping
> plug/unplug event to trigger the reconfiguration of audio server
> does the audio server require to know the initial state of the hdmi
> or just need the trigger event ?
For all three of the accessory detection mechanisms the state can be
read at any time.
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