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From: Takashi Iwai <tiwai@suse.de>
To: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: alsa-devel@alsa-project.org, 'Clemens Ladisch' <clemens@ladisch.de>
Subject: Re: ALSA: hda: hdmi: Hint matching between input	devices and pcm devices
Date: Mon, 12 Sep 2011 09:10:58 +0200	[thread overview]
Message-ID: <s5hobyq8ccd.wl%tiwai@suse.de> (raw)
In-Reply-To: <000601cc6714$fc5caa80$f515ff80$@bossart@linux.intel.com>

At Tue, 30 Aug 2011 08:01:50 -0500,
Pierre-Louis Bossart wrote:
> 
> Hi Clemens,
> 
> > If the driver can detect ELD changes, it must inform userspace that
> > the control has changed.  If there is no ELD, the _get callback should
> > return an error, and the control should have been set to unreadable.
> 
> Bear with my ignorance of controls, but how does the driver 'inform
> userspace that the control has changed'?

The control API has a notification mechanism.  You can find some
drivers calling snd_ctl_notify().


Takashi

      parent reply	other threads:[~2011-09-12  7:11 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-23 15:11 ALSA: hda: hdmi: Hint matching between input devices and pcm devices David Henningsson
2011-08-23 15:51 ` Stephen Warren
2011-08-24  4:53   ` David Henningsson
2011-08-24 21:21     ` Stephen Warren
2011-08-25  7:13       ` David Henningsson
2011-08-25 17:41         ` Stephen Warren
2011-08-25 21:37           ` David Henningsson
2011-08-29 22:14             ` Pierre-Louis Bossart
2011-08-30  7:06               ` David Henningsson
2011-08-30  7:40               ` Clemens Ladisch
2011-08-30 13:01                 ` Pierre-Louis Bossart
     [not found]                 ` <000601cc6714$fc5caa80$f515ff80$@bossart@linux.intel.com>
2011-09-12  7:10                   ` Takashi Iwai [this message]

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