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ALSA: hda: Virtualize SPDIF out controls

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The SPDIF output controls apply to converter widgets. A future change
will create a PCM device per pin widget, and hence a set of SPDIF output
controls per pin widget, for certain HDMI codecs. To support this, we
need the ability to virtualize the SPDIF output controls. Specifically:

* Controls can be "unassigned" from real hardware when a converter is
  not used for the PCM the control was created for.
* Control puts only write to hardware when they are assigned.
* Controls can be "assigned" to real hardware when a converter is picked
  to support output for a particular PCM.
* When a converter is assigned, the hardware is updated to the cached
  configuration.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Stephen Warren
2011-06-01 11:14:18 -06:00
committed by Takashi Iwai
parent 7c93597627
commit 74b654c957
12 changed files with 69 additions and 23 deletions
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4
sound/pci/hda/patch_analog.c
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@@ -213,7 +213,9 @@ static int ad198x_build_controls(struct hda_codec *codec)
return err;
}
if (spec->multiout.dig_out_nid) {
err = snd_hda_create_spdif_out_ctls(codec, spec->multiout.dig_out_nid);
err = snd_hda_create_spdif_out_ctls(codec,
spec->multiout.dig_out_nid,
spec->multiout.dig_out_nid);
if (err < 0)
return err;
err = snd_hda_create_spdif_share_sw(codec,