A question about the soc jack status

A question about the soc jack status

[Joonyoung Shim]

Hi, all.

I have a question about soc jack. I know the soc jack reports the jack 
status when the jack status is change only. For example when the jack 
is inserted or released, the soc jack reports the jack status to user 
via input subsystem.

But i want to know the jack status always regardless of the event to 
insert or release a jack. For example we can check the jack status 
always if the jack status is reported via sysfs file.

So, is there how to know the jack status always the currently?

Re: A question about the soc jack status

[Joonyoung Shim]

On 10/28/2009 4:32 PM, Naveen Krishna Ch wrote:
> 2009/10/28 Joonyoung Shim <jy0922.shim@samsung.com>
> 
>> Hi, all.
>>
>> I have a question about soc jack. I know the soc jack reports the jack
>> status when the jack status is change only. For example when the jack
>> is inserted or released, the soc jack reports the jack status to user
>> via input subsystem.
>>
>> But i want to know the jack status always regardless of the event to
>> insert or release a jack. For example we can check the jack status
>> always if the jack status is reported via sysfs file.
>>
> There is a /sys/class/soc/jack/status
> Dont remember the exact path.
> Cat of that file will tell us right
> 

I cannot find "jack" word under /sys directory.
Can you give me the exact path?

>> So, is there how to know the jack status always the currently?
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel@alsa-project.org
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>
> 
> 
> 

Re: A question about the soc jack status

[Mark Brown]

On Wed, Oct 28, 2009 at 04:16:49PM +0900, Joonyoung Shim wrote:

> I have a question about soc jack. I know the soc jack reports the jack 
> status when the jack status is change only. For example when the jack 
> is inserted or released, the soc jack reports the jack status to user 
> via input subsystem.

> But i want to know the jack status always regardless of the event to 
> insert or release a jack. For example we can check the jack status 
> always if the jack status is reported via sysfs file.

> So, is there how to know the jack status always the currently?

You can query this with an ioctl() on the input device - EVIOCGSW()
should do the trick, evtest.c has some example code I believe.  Adding
this information to sysfs would be nice if someone has the time to look
into it.