diff options
Diffstat (limited to 'Documentation/sound')
| -rw-r--r-- | Documentation/sound/soc/dapm.rst | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/Documentation/sound/soc/dapm.rst b/Documentation/sound/soc/dapm.rst index 57d96a39f124..50f908f4e8ed 100644 --- a/Documentation/sound/soc/dapm.rst +++ b/Documentation/sound/soc/dapm.rst @@ -253,12 +253,17 @@ This can be used to merge two signal paths together in software. Registering DAPM controls ========================= -In many cases the DAPM widgets implemented statically in a ``static const -struct snd_soc_dapm_widget`` array and the routes connecting them in a -``static const struct snd_soc_dapm_route`` array in a codec driver, and -simply declared via the ``dapm_widgets`` and ``num_dapm_widgets`` fields of -the ``struct snd_soc_component_driver`` so the driver registration will -take care of populating them:: +In many cases the DAPM widgets are implemented statically in a ``static +const struct snd_soc_dapm_widget`` array in a codec driver, and simply +declared via the ``dapm_widgets`` and ``num_dapm_widgets`` fields of the +``struct snd_soc_component_driver``. + +Similarly, routes connecting them are implemented statically in a ``static +const struct snd_soc_dapm_route`` array and declared via the +``dapm_routes`` and ``num_dapm_routes`` fields of the same struct. + +With the above declared, the driver registration will take care of +populating them:: static const struct snd_soc_dapm_widget wm2000_dapm_widgets[] = { SND_SOC_DAPM_OUTPUT("SPKN"), @@ -277,11 +282,13 @@ take care of populating them:: ... .dapm_widgets = wm2000_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(wm2000_dapm_widgets), + .dapm_routes = wm2000_audio_map, + .num_dapm_routes = ARRAY_SIZE(wm2000_audio_map), ... }; In more complex cases the list of DAPM widgets and/or routes can be only -known at build time. This happens for example when a driver supports +known at probe time. This happens for example when a driver supports different models having a different set of features. In those cases separate widgets and routes arrays implementing the case-specific features can be registered programmatically by calling snd_soc_dapm_new_controls() |