2 files changed, 37 insertions, 1 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 5915fc059842..d5d6ba862dfe 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -339,6 +339,8 @@ int snd_soc_dapm_disable_pin(struct snd_soc_codec *codec, const char *pin);
 int snd_soc_dapm_nc_pin(struct snd_soc_codec *codec, const char *pin);
 int snd_soc_dapm_get_pin_status(struct snd_soc_codec *codec, const char *pin);
 int snd_soc_dapm_sync(struct snd_soc_codec *codec);
+int snd_soc_dapm_force_enable_pin(struct snd_soc_codec *codec,
+                                  const char *pin);
 
 /* dapm widget types */
 enum snd_soc_dapm_type {
@@ -426,6 +428,7 @@ struct snd_soc_dapm_widget {
         unsigned char new:1;                    /* cnew complete */
         unsigned char ext:1;                    /* has external widgets */
         unsigned char suspend:1;                /* was active before suspend */
+        unsigned char force:1;                  /* force state */
 
         int (*power_check)(struct snd_soc_dapm_widget *w);
 
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 86ded22e36af..bbb2135a0b21 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -979,7 +979,10 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event)
                                 break;
 
                         default:
-                                power = w->power_check(w);
+                                if (!w->force)
+                                        power = w->power_check(w);
+                                else
+                                        power = 1;
                                 if (power)
                                         sys_power = 1;
                                 break;
@@ -2134,6 +2137,36 @@ int snd_soc_dapm_enable_pin(struct snd_soc_codec *codec, const char *pin)
 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
 
 /**
+ * snd_soc_dapm_force_enable_pin - force a pin to be enabled
+ * @codec: SoC codec
+ * @pin: pin name
+ *
+ * Enables input/output pin regardless of any other state.  This is
+ * intended for use with microphone bias supplies used in microphone
+ * jack detection.
+ *
+ * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
+ * do any widget power switching.
+ */
+int snd_soc_dapm_force_enable_pin(struct snd_soc_codec *codec, const char *pin)
+{
+        struct snd_soc_dapm_widget *w;
+
+        list_for_each_entry(w, &codec->dapm_widgets, list) {
+                if (!strcmp(w->name, pin)) {
+                        pr_debug("dapm: %s: pin %s\n", codec->name, pin);
+                        w->connected = 1;
+                        w->force = 1;
+                        return 0;
+                }
+        }
+
+        pr_err("dapm: %s: configuring unknown pin %s\n", codec->name, pin);
+        return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
+
+/**
  * snd_soc_dapm_disable_pin - disable pin.
  * @codec: SoC codec
  * @pin: pin name