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>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 540872fc1390..8031769ac485 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -93,6 +93,9 @@
 #define SND_SOC_DAPM_MUX(wname, wreg, wshift, winvert, wcontrols) \
 {       .id = snd_soc_dapm_mux, .name = wname, .reg = wreg, .shift = wshift, \
         .invert = winvert, .kcontrols = wcontrols, .num_kcontrols = 1}
+#define SND_SOC_DAPM_VIRT_MUX(wname, wreg, wshift, winvert, wcontrols) \
+{       .id = snd_soc_dapm_virt_mux, .name = wname, .reg = wreg, .shift = wshift, \
+        .invert = winvert, .kcontrols = wcontrols, .num_kcontrols = 1}
 #define SND_SOC_DAPM_VALUE_MUX(wname, wreg, wshift, winvert, wcontrols) \
 {       .id = snd_soc_dapm_value_mux, .name = wname, .reg = wreg, \
         .shift = wshift, .invert = winvert, .kcontrols = wcontrols, \
@@ -148,6 +151,11 @@
 {       .id = snd_soc_dapm_mux, .name = wname, .reg = wreg, .shift = wshift, \
         .invert = winvert, .kcontrols = wcontrols, .num_kcontrols = 1, \
         .event = wevent, .event_flags = wflags}
+#define SND_SOC_DAPM_VIRT_MUX_E(wname, wreg, wshift, winvert, wcontrols, \
+        wevent, wflags) \
+{       .id = snd_soc_dapm_virt_mux, .name = wname, .reg = wreg, .shift = wshift, \
+        .invert = winvert, .kcontrols = wcontrols, .num_kcontrols = 1, \
+        .event = wevent, .event_flags = wflags}
 
 /* Simplified versions of above macros, assuming wncontrols = ARRAY_SIZE(wcontrols) */
 #define SOC_PGA_E_ARRAY(wname, wreg, wshift, winvert, wcontrols, \
@@ -357,6 +365,7 @@ enum snd_soc_dapm_type {
         snd_soc_dapm_input = 0,         /* input pin */
         snd_soc_dapm_output,            /* output pin */
         snd_soc_dapm_mux,                       /* selects 1 analog signal from many inputs */
+        snd_soc_dapm_virt_mux,                  /* virtual version of snd_soc_dapm_mux */
         snd_soc_dapm_value_mux,                 /* selects 1 analog signal from many inputs */
         snd_soc_dapm_mixer,                     /* mixes several analog signals together */
         snd_soc_dapm_mixer_named_ctl,           /* mixer with named controls */