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>

2 files changed, 28 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 */
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 1debc3b05665..50f5c785cb61 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -56,6 +56,7 @@ static int dapm_up_seq[] = {
         [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 @@ static int dapm_down_seq[] = {
         [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 @@ static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
                 }
         }
         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 @@ static int dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
         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 @@ static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
                 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 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
                         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);