Use sensorfw for ambient light and proximity sensor input

Tracks sensord D-Bus name on system bus to detect availability
of the sensors API.

While the D-Bus name is not reserved, ALS and PS enable states
are cached internally within MCE. When sensord startup / restart
is detected the cached state is used for opening sensor sessions
as needed.

[mce] Use sensorfw for ambient light and proximity sensor input

.depend

@@ -234,6 +234,18 @@ mce-modules.pic.o:\
 	mce-modules.h\
 	mce.h\
 
+mce-sensorfw.o:\
+	mce-sensorfw.c\
+	mce-dbus.h\
+	mce-log.h\
+	mce-sensorfw.h\
+
+mce-sensorfw.pic.o:\
+	mce-sensorfw.c\
+	mce-dbus.h\
+	mce-log.h\
+	mce-sensorfw.h\
+
 mce.o:\
 	mce.c\
 	datapipe.h\
@@ -246,6 +258,7 @@ mce.o:\
 	mce-gconf.h\
 	mce-log.h\
 	mce-modules.h\
+	mce-sensorfw.h\
 	mce.h\
 	modetransition.h\
 	powerkey.h\
@@ -263,6 +276,7 @@ mce.pic.o:\
 	mce-gconf.h\
 	mce-log.h\
 	mce-modules.h\
+	mce-sensorfw.h\
 	mce.h\
 	modetransition.h\
 	powerkey.h\
@@ -463,6 +477,7 @@ modules/filter-brightness-als.o:\
 	mce-io.h\
 	mce-lib.h\
 	mce-log.h\
+	mce-sensorfw.h\
 	mce.h\
 	median_filter.h\
 	mce-hybris.h\
@@ -479,6 +494,7 @@ modules/filter-brightness-als.pic.o:\
 	mce-io.h\
 	mce-lib.h\
 	mce-log.h\
+	mce-sensorfw.h\
 	mce.h\
 	median_filter.h\
 	mce-hybris.h\
@@ -600,6 +616,7 @@ modules/proximity.o:\
 	mce-hal.h\
 	mce-io.h\
 	mce-log.h\
+	mce-sensorfw.h\
 	mce.h\
 	mce-hybris.h\
 	modules/proximity.h\
@@ -612,6 +629,7 @@ modules/proximity.pic.o:\
 	mce-hal.h\
 	mce-io.h\
 	mce-log.h\
+	mce-sensorfw.h\
 	mce.h\
 	mce-hybris.h\
 	modules/proximity.h\

Makefile

@@ -69,6 +69,9 @@ endif
 endif
 PKG_CONFIG   ?= pkg-config
 
+# Whether to use sensorfw for ALS/PS
+ENABLE_SENSORFW ?= y
+
 # Whether to enable support for libhybris plugin
 ENABLE_HYBRIS ?= y
 
@@ -212,6 +215,10 @@ ifeq ($(strip $(ENABLE_BUILTIN_GCONF)),y)
 CPPFLAGS += -DENABLE_BUILTIN_GCONF
 endif
 
+ifeq ($(ENABLE_SENSORFW),y)
+CPPFLAGS += -DENABLE_SENSORFW
+endif
+
 ifeq ($(ENABLE_HYBRIS),y)
 CPPFLAGS += -DENABLE_HYBRIS
 endif
@@ -297,6 +304,7 @@ MCE_CORE += mce-log.c
 MCE_CORE += mce-conf.c
 MCE_CORE += datapipe.c
 MCE_CORE += mce-modules.c
+MCE_CORE += mce-sensorfw.c
 MCE_CORE += mce-io.c
 MCE_CORE += mce-lib.c
 MCE_CORE += median_filter.c
@@ -305,6 +313,9 @@ MCE_CORE += filewatcher.c
 ifeq ($(ENABLE_HYBRIS),y)
 MCE_CORE += mce-hybris.c
 endif
+ifeq ($(ENABLE_SENSORFW),y)
+MCE_CORE += mce-sensorfw.c
+endif
 # HACK: do not link against libgconf-2
 ifeq ($(strip $(ENABLE_BUILTIN_GCONF)),y)
 MCE_CORE   += builtin-gconf.c