3 files changed, 46 insertions, 6 deletions

diff --git a/Documentation/sound/alsa/soc/dapm.txt b/Documentation/sound/alsa/soc/dapm.txt
index 9e6763264a2e..9ac842be9b4f 100644
--- a/Documentation/sound/alsa/soc/dapm.txt
+++ b/Documentation/sound/alsa/soc/dapm.txt
@@ -62,6 +62,7 @@ Audio DAPM widgets fall into a number of types:-
  o Mic        - Mic (and optional Jack)
  o Line       - Line Input/Output (and optional Jack)
  o Speaker    - Speaker
+ o Supply     - Power or clock supply widget used by other widgets.
  o Pre        - Special PRE widget (exec before all others)
  o Post       - Special POST widget (exec after all others)
 
diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 839a97b63269..533f9f256496 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -154,12 +154,16 @@
         .shift = wshift, .invert = winvert, \
         .event = wevent, .event_flags = wflags}
 
-/* generic register modifier widget */
+/* generic widgets */
 #define SND_SOC_DAPM_REG(wid, wname, wreg, wshift, wmask, won_val, woff_val) \
 {       .id = wid, .name = wname, .kcontrols = NULL, .num_kcontrols = 0, \
         .reg = -((wreg) + 1), .shift = wshift, .mask = wmask, \
         .on_val = won_val, .off_val = woff_val, .event = dapm_reg_event, \
         .event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD}
+#define SND_SOC_DAPM_SUPPLY(wname, wreg, wshift, winvert, wevent, wflags) \
+{       .id = snd_soc_dapm_supply, .name = wname, .reg = wreg,  \
+        .shift = wshift, .invert = winvert, .event = wevent, \
+        .event_flags = wflags}
 
 /* dapm kcontrol types */
 #define SOC_DAPM_SINGLE(xname, reg, shift, max, invert) \
@@ -308,6 +312,7 @@ enum snd_soc_dapm_type {
         snd_soc_dapm_vmid,                      /* codec bias/vmid - to minimise pops */
         snd_soc_dapm_pre,                       /* machine specific pre widget - exec first */
         snd_soc_dapm_post,                      /* machine specific post widget - exec last */
+        snd_soc_dapm_supply,            /* power/clock supply */
 };
 
 /*
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index d3d17354e76c..7847f80e96d1 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -52,17 +52,19 @@
 
 /* dapm power sequences - make this per codec in the future */
 static int dapm_up_seq[] = {
-        snd_soc_dapm_pre, snd_soc_dapm_micbias, snd_soc_dapm_mic,
-        snd_soc_dapm_mux, snd_soc_dapm_value_mux, snd_soc_dapm_dac,
-        snd_soc_dapm_mixer, snd_soc_dapm_mixer_named_ctl, snd_soc_dapm_pga,
-        snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk, snd_soc_dapm_post
+        snd_soc_dapm_pre, snd_soc_dapm_supply, snd_soc_dapm_micbias,
+        snd_soc_dapm_mic, snd_soc_dapm_mux, snd_soc_dapm_value_mux,
+        snd_soc_dapm_dac, snd_soc_dapm_mixer, snd_soc_dapm_mixer_named_ctl,
+        snd_soc_dapm_pga, snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk,
+        snd_soc_dapm_post
 };
 
 static int dapm_down_seq[] = {
         snd_soc_dapm_pre, snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk,
         snd_soc_dapm_pga, snd_soc_dapm_mixer_named_ctl, snd_soc_dapm_mixer,
         snd_soc_dapm_dac, snd_soc_dapm_mic, snd_soc_dapm_micbias,
-        snd_soc_dapm_mux, snd_soc_dapm_value_mux, snd_soc_dapm_post
+        snd_soc_dapm_mux, snd_soc_dapm_value_mux, snd_soc_dapm_supply,
+        snd_soc_dapm_post
 };
 
 static int dapm_status = 1;
@@ -165,6 +167,7 @@ static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
         case snd_soc_dapm_dac:
         case snd_soc_dapm_micbias:
         case snd_soc_dapm_vmid:
+        case snd_soc_dapm_supply:
                 p->connect = 1;
         break;
         /* does effect routing - dynamically connected */
@@ -435,6 +438,9 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget)
         struct snd_soc_dapm_path *path;
         int con = 0;
 
+        if (widget->id == snd_soc_dapm_supply)
+                return 0;
+
         if (widget->id == snd_soc_dapm_adc && widget->active)
                 return 1;
 
@@ -471,6 +477,9 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget)
         struct snd_soc_dapm_path *path;
         int con = 0;
 
+        if (widget->id == snd_soc_dapm_supply)
+                return 0;
+
         /* active stream ? */
         if (widget->id == snd_soc_dapm_dac && widget->active)
                 return 1;
@@ -622,6 +631,26 @@ static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
         }
 }
 
+/* Check to see if a power supply is needed */
+static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
+{
+        struct snd_soc_dapm_path *path;
+        int power = 0;
+
+        /* Check if one of our outputs is connected */
+        list_for_each_entry(path, &w->sinks, list_source) {
+                if (path->sink && path->sink->power_check &&
+                    path->sink->power_check(path->sink)) {
+                        power = 1;
+                        break;
+                }
+        }
+
+        dapm_clear_walk(w->codec);
+
+        return power;
+}
+
 /*
  * Scan a single DAPM widget for a complete audio path and update the
  * power status appropriately.
@@ -752,6 +781,7 @@ static void dbg_dump_dapm(struct snd_soc_codec* codec, const char *action)
                 case snd_soc_dapm_pga:
                 case snd_soc_dapm_mixer:
                 case snd_soc_dapm_mixer_named_ctl:
+                case snd_soc_dapm_supply:
                         if (w->name) {
                                 in = is_connected_input_ep(w);
                                 dapm_clear_walk(w->codec);
@@ -880,6 +910,7 @@ static ssize_t dapm_widget_show(struct device *dev,
                 case snd_soc_dapm_pga:
                 case snd_soc_dapm_mixer:
                 case snd_soc_dapm_mixer_named_ctl:
+                case snd_soc_dapm_supply:
                         if (w->name)
                                 count += sprintf(buf + count, "%s: %s\n",
                                         w->name, w->power ? "On":"Off");
@@ -1044,6 +1075,7 @@ static int snd_soc_dapm_add_route(struct snd_soc_codec *codec,
         case snd_soc_dapm_vmid:
         case snd_soc_dapm_pre:
         case snd_soc_dapm_post:
+        case snd_soc_dapm_supply:
                 list_add(&path->list, &codec->dapm_paths);
                 list_add(&path->list_sink, &wsink->sources);
                 list_add(&path->list_source, &wsource->sinks);
@@ -1164,6 +1196,8 @@ int snd_soc_dapm_new_widgets(struct snd_soc_codec *codec)
                 case snd_soc_dapm_line:
                         w->power_check = dapm_generic_check_power;
                         break;
+                case snd_soc_dapm_supply:
+                        w->power_check = dapm_supply_check_power;
                 case snd_soc_dapm_vmid:
                 case snd_soc_dapm_pre:
                 case snd_soc_dapm_post: