muteing speakers if headphones were plugged in?

muteing speakers if headphones were plugged in?

[Matthias Grimm]

Hi,

I was asked to built a new feature into pbbuttons: To mute the speakers
if headphones are plugged in.

I don't know where to get the information if headphones are plugged in
or not, so I had a look into the recent kernel and I saw some code (for
eg. headphone_intr() ) that seems to do what I am asked for. On the
other hand the code seems very experimental and not really complete as I
could see at some comments.

What is the status? Should this feature (muting the speakers ...) be
part of the kernel or was it only a fast shot to get it work?

I saw the most headphone code within the Tumbler section so I assume
that it would only work on new TiBooks and iBooks?

Nevertheless is there a method to get the information of the line-in
jack status from user space?

  Thanks for your help and best regards
     Matthias


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/

Re: muteing speakers if headphones were plugged in?

[Benjamin Herrenschmidt]

>
>Hi,
>
>I was asked to built a new feature into pbbuttons: To mute the speakers
>if headphones are plugged in.

It's already implemented at the driver level for some chipsets.

>I don't know where to get the information if headphones are plugged in
>or not, so I had a look into the recent kernel and I saw some code (for
>eg. headphone_intr() ) that seems to do what I am asked for. On the
>other hand the code seems very experimental and not really complete as I
>could see at some comments.
>
>What is the status? Should this feature (muting the speakers ...) be
>part of the kernel or was it only a fast shot to get it work?

It works with recent drivers though only if your chipset is Tumbler afaik.

>I saw the most headphone code within the Tumbler section so I assume
>that it would only work on new TiBooks and iBooks?

Yes.

>Nevertheless is there a method to get the information of the line-in
>jack status from user space?

Not that I know of, but I don't know the OSS API that well, it may
be possible to add this information to what is returned from the driver.

Ben.


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/

Re: muteing speakers if headphones were plugged in?

[Matthias Grimm]

Benjamin Herrenschmidt wrote:

>>I don't know where to get the information if headphones are plugged in
>>or not, so I had a look into the recent kernel and I saw some code (for
>>eg. headphone_intr() ) that seems to do what I am asked for. On the
>>other hand the code seems very experimental and not really complete as I
>>could see at some comments.
>>
>>What is the status? Should this feature (muting the speakers ...) be
>>part of the kernel or was it only a fast shot to get it work?
>>
>
> It works with recent drivers though only if your chipset is Tumbler afaik.


Is someone working on that issue to implement it for the other chipsets?

  Matthias


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/

Re: muteing speakers if headphones were plugged in?

[benh]

>
>Is someone working on that issue to implement it for the other chipsets?

I think the Alsa driver can work on other chipsets. I don't know if
someone is working on it for dmasound, I don't think so.

On these (awacs, burgundy), I think you don't have to register a second
interrupt, the main chip interrupt will be called when the jack state
changes, you can probably act from there. A good source of info is the
darwin source code which contains source code for all of Apple sound
drivers.

Ben.


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/