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...
- 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.
- if the objective of adding jack detection is for trapping
plug/unplug event to trigger the reconfiguration of audio server
http://thread.gmane.org/gmane.linux.alsa.devel/89781/focus=89788
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.