[alsa-devel] Signaling user-space through kcontrol

[Patrick Lai]

On 9/27/2011 11:15 PM, Vinod Koul wrote:
> On Tue, 2011-09-27 at 23:14 -0700, Patrick Lai wrote:
>> Hi Mark,
>>
>> The codec I am working on, beside headset detection, also have other
>> type of events to be propagated to user space. Per our discussion at
>> IPC, there is way to signal user-space through kcontrol. Is it through
>> calling snd_ctl_notify()? What is the ALSA library API to intercept the
>> event? Is there an sample user-space code which gets kcontrol event?
>>
> What events do you have in mind?
>
Main one is detection of short circuiting headphone For this case,
there is no need for extra payload. In case of there is need to pass
back some payload, I presume user-space application can simply call the
get function upon receiving notification.

Thanks
Patrick

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