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/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 540872f..8031769 100644 (file)
--- 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 1debc3b..50f5c78 100644 (file)
--- 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);