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$@bossart@linux.intel.com>
At Tue, 30 Aug 2011 08:01:50 -0500,
Pierre-Louis Bossart wrote:
>
> Hi Clemens,
>
> > If the driver can detect ELD changes, it must inform userspace that
> > the control has changed. If there is no ELD, the _get callback should
> > return an error, and the control should have been set to unreadable.
>
> Bear with my ignorance of controls, but how does the driver 'inform
> userspace that the control has changed'?
The control API has a notification mechanism. You can find some
drivers calling snd_ctl_notify().
Takashi
prev parent reply other threads:[~2011-09-12 7:11 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-23 15:11 ALSA: hda: hdmi: Hint matching between input devices and pcm devices David Henningsson
2011-08-23 15:51 ` Stephen Warren
2011-08-24 4:53 ` David Henningsson
2011-08-24 21:21 ` Stephen Warren
2011-08-25 7:13 ` David Henningsson
2011-08-25 17:41 ` Stephen Warren
2011-08-25 21:37 ` David Henningsson
2011-08-29 22:14 ` Pierre-Louis Bossart
2011-08-30 7:06 ` David Henningsson
2011-08-30 7:40 ` Clemens Ladisch
2011-08-30 13:01 ` Pierre-Louis Bossart
[not found] ` <000601cc6714$fc5caa80$f515ff80$@bossart@linux.intel.com>
2011-09-12 7:10 ` Takashi Iwai [this message]
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