ASoC: soc-dapm: Introduce the new snd_soc_dapm_virt_mux type
This new type is a virtual version of snd_soc_dapm_mux. It is used
when a backing register value is not necessary for deciding which
input path to connect. A simple virtual enumeration control e.g.
SOC_DAPM_ENUM_VIRT() can be exposed to userspace which will be used
to choose which path to connect.
The snd_soc_dapm_virt_mux type ensures that during the initial
path setup, the first (which is also the default) input path will
be connected.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 1debc3b..50f5c78 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -56,6 +56,7 @@
[snd_soc_dapm_aif_out] = 3,
[snd_soc_dapm_mic] = 4,
[snd_soc_dapm_mux] = 5,
+ [snd_soc_dapm_virt_mux] = 5,
[snd_soc_dapm_value_mux] = 5,
[snd_soc_dapm_dac] = 6,
[snd_soc_dapm_mixer] = 7,
@@ -81,6 +82,7 @@
[snd_soc_dapm_mic] = 7,
[snd_soc_dapm_micbias] = 8,
[snd_soc_dapm_mux] = 9,
+ [snd_soc_dapm_virt_mux] = 9,
[snd_soc_dapm_value_mux] = 9,
[snd_soc_dapm_aif_in] = 10,
[snd_soc_dapm_aif_out] = 10,
@@ -216,6 +218,20 @@
}
}
break;
+ case snd_soc_dapm_virt_mux: {
+ struct soc_enum *e = (struct soc_enum *)w->kcontrols[i].private_value;
+
+ p->connect = 0;
+ /* since a virtual mux has no backing registers to
+ * decide which path to connect, it will try to match
+ * with the first enumeration. This is to ensure
+ * that the default mux choice (the first) will be
+ * correctly powered up during initialization.
+ */
+ if (!strcmp(p->name, e->texts[0]))
+ p->connect = 1;
+ }
+ break;
case snd_soc_dapm_value_mux: {
struct soc_enum *e = (struct soc_enum *)
w->kcontrols[i].private_value;
@@ -1228,6 +1244,7 @@
int found = 0;
if (widget->id != snd_soc_dapm_mux &&
+ widget->id != snd_soc_dapm_virt_mux &&
widget->id != snd_soc_dapm_value_mux)
return -ENODEV;
@@ -1534,6 +1551,7 @@
path->connect = 1;
return 0;
case snd_soc_dapm_mux:
+ case snd_soc_dapm_virt_mux:
case snd_soc_dapm_value_mux:
ret = dapm_connect_mux(dapm, wsource, wsink, path, control,
&wsink->kcontrols[0]);
@@ -1623,6 +1641,7 @@
dapm_new_mixer(dapm, w);
break;
case snd_soc_dapm_mux:
+ case snd_soc_dapm_virt_mux:
case snd_soc_dapm_value_mux:
w->power_check = dapm_generic_check_power;
dapm_new_mux(dapm, w);