ASoC: Add virtual enumeration support for DAPM muxes

Sometimes it is desirable to have a mux which does not reflect any
direct register configuration but which will instead only have an
effect implicitly (for example, as a result of changing which parts
of the device are powered up). Provide a virtual mux for this purpose.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 311467b95afb..d2af872e4771 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1808,6 +1808,54 @@ out:
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
 
 /**
+ * snd_soc_dapm_get_enum_virt - Get virtual DAPM mux
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_get_enum_virt(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
+
+        ucontrol->value.enumerated.item[0] = widget->value;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_virt);
+
+/**
+ * snd_soc_dapm_put_enum_virt - Set virtual DAPM mux
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
+        struct soc_enum *e =
+                (struct soc_enum *)kcontrol->private_value;
+        int change;
+        int ret = 0;
+
+        if (ucontrol->value.enumerated.item[0] >= e->max)
+                return -EINVAL;
+
+        mutex_lock(&widget->codec->mutex);
+
+        change = widget->value != ucontrol->value.enumerated.item[0];
+        widget->value = ucontrol->value.enumerated.item[0];
+        dapm_mux_update_power(widget, kcontrol, change, widget->value, e);
+
+        mutex_unlock(&widget->codec->mutex);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_virt);
+
+/**
  * snd_soc_dapm_get_value_enum_double - dapm semi enumerated double mixer get
  *                                      callback
  * @kcontrol: mixer control