Hi, I was looking into creating jack sense device. I see that I can create jack sense for headphones/headset/mic etc,. but if I want to send events like long press and short press of headset keys, can I use this same framework in someway? Is there any way to event these kinds of actions to user space through ALSA?
Thanks, Harsha
-----Original Message----- From: Mark Brown [mailto:broonie@opensource.wolfsonmicro.com] Sent: Wednesday, July 08, 2009 3:16 PM To: Harsha, Priya Cc: Koul, Vinod; alsa-devel@alsa-project.org Subject: Re: [alsa-devel] [PATCH] [RFC 8/13] Intel SST sound card driver
On Wed, Jul 08, 2009 at 11:14:07AM +0530, Harsha, Priya wrote:
-----Original Message----- From: Mark Brown [mailto:broonie@opensource.wolfsonmicro.com]
Yes, the jacks currently appear as input devices to applications. Takashi was also considering adding some ALSA-specific ways of reading the state to go alongside these.
If I create a jack sense device, how would an application use it? Currently do we have any mechanism in ALSA to send events to user space when a jack is detected? If not, would it be ok if I stick to netlink
Yes, they see it as a normal input device under /dev/input. The jack input device will provide one or more switches and buttons depending on what it can detect.
events for now. We have a platform specific daemon that is being developed that listens on netlink events and that is why the driver sends them.
Your daemon should be able to use /dev/input for this. This will also help if users run other applications on the system since the standard API for jack sense will be there.