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ASoC: dapm: support user-defined stop condition in dai_get_connected_widgets

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Certain situations may warrant examining DAPM paths only to a certain
arbitrary point, as opposed to always following them to the end. For
instance, when establishing a connection between a front-end DAI link
and a back-end DAI link in a DPCM path, it does not make sense to walk
the DAPM graph beyond the first widget associated with a back-end link.

This patch introduces a mechanism which lets a user of
dai_get_connected_widgets supply a function which will be called for
every node during the graph walk. When invoked, this function can
execute arbitrary logic to decide whether the walk, given a DAPM widget
and walk direction, should be terminated at that point or continued
as normal.

Signed-off-by: Piotr Stankiewicz <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Piotr Stankiewicz 2016-05-13 17:03:55 +01:00 • committed by Mark Brown
commit 6742064aef
3 changed files with 51 additions and 15 deletions
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5
include/sound/soc-dapm.h
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@ -358,6 +358,7 @@ struct snd_soc_dapm_context;
struct regulator;
struct snd_soc_dapm_widget_list;
struct snd_soc_dapm_update;
enum snd_soc_dapm_direction;
int dapm_regulator_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event);
@ -451,7 +452,9 @@ void dapm_mark_endpoints_dirty(struct snd_soc_card *card);
/* dapm path query */
int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
struct snd_soc_dapm_widget_list **list);
struct snd_soc_dapm_widget_list **list,
bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
enum snd_soc_dapm_direction));
struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
struct snd_kcontrol *kcontrol);