ASoC: allow drivers to compile both static and dynamic

Based on where the code is synced the driver should allow
both static and dynamic linked compilation.
Also remove __exit for modules loaded from another common
init/exit functions.

Change-Id: Ib58f152002aba3af4446f9bbd9b82c279212bd0a
Signed-off-by: Asish Bhattacharya <asishb@codeaurora.org>
diff --git a/soc/Kbuild b/soc/Kbuild
index 45b77e9..c9cf31b 100644
--- a/soc/Kbuild
+++ b/soc/Kbuild
@@ -1,22 +1,31 @@
 # We can build either as part of a standalone Kernel build or as
 # an external module.  Determine which mechanism is being used
-KERNEL_BUILD := 0
+ifeq ($(MODNAME),)
+	KERNEL_BUILD := 1
+else
+	KERNEL_BUILD := 0
+endif
 
-
-ifeq ($(KERNEL_BUILD), 0)
+ifeq ($(KERNEL_BUILD), 1)
 	# These are configurable via Kconfig for kernel-based builds
 	# Need to explicitly configure for Android-based builds
+	AUDIO_BLD_DIR := $(ANDROID_BUILD_TOP)/kernel/msm-4.9
+	AUDIO_ROOT := $(AUDIO_BLD_DIR)/techpack/audio
+endif
+
+ifeq ($(KERNEL_BUILD), 0)
 	ifeq ($(CONFIG_ARCH_SDM845), y)
 		include $(AUDIO_ROOT)/config/sdm845auto.conf
 		export
+		INCS    +=  -include $(AUDIO_ROOT)/config/sdm845autoconf.h
 	endif
 	ifeq ($(CONFIG_ARCH_SDM670), y)
 		include $(AUDIO_ROOT)/config/sdm670auto.conf
 		export
+		INCS    +=  -include $(AUDIO_ROOT)/config/sdm670autoconf.h
 	endif
 endif
 
-
 # As per target team, build is done as follows:
 # Defconfig : build with default flags
 # Slub      : defconfig  + CONFIG_SLUB_DEBUG := y +
@@ -44,37 +53,30 @@
 ############ SoC Modules ############
 
 # for pinctrl WCD driver
-ifeq ($(CONFIG_PINCTRL_WCD), m)
+ifdef CONFIG_PINCTRL_WCD
 	PINCTRL_WCD_OBJS += pinctrl-wcd.o
 endif
 
 # for pinctrl LPI driver
-ifeq ($(CONFIG_PINCTRL_LPI), m)
+ifdef CONFIG_PINCTRL_LPI
 	PINCTRL_LPI_OBJS += pinctrl-lpi.o
 endif
 
 # for soundwire driver
-ifeq ($(CONFIG_SOUNDWIRE_WCD_CTRL), m)
+ifdef CONFIG_SOUNDWIRE_WCD_CTRL
 	SWR_CTRL_OBJS += swr-wcd-ctrl.o
 endif
 
-ifeq ($(CONFIG_SOUNDWIRE), m)
+ifdef CONFIG_SOUNDWIRE
 	SWR_OBJS += regmap-swr.o
 	SWR_OBJS += soundwire.o
 endif
 
 LINUX_INC +=	-Iinclude/linux
 
-INCS :=		$(COMMON_INC) \
+INCS +=		$(COMMON_INC) \
 		$(UAPI_INC)
 
-ifeq ($(CONFIG_ARCH_SDM845), y)
-INCS    +=  -include $(AUDIO_ROOT)/config/sdm845autoconf.h
-endif
-ifeq ($(CONFIG_ARCH_SDM670), y)
-INCS    +=  -include $(AUDIO_ROOT)/config/sdm670autoconf.h
-endif
-
 EXTRA_CFLAGS += $(INCS)
 
 
@@ -90,7 +92,10 @@
 
 KBUILD_CPPFLAGS += $(CDEFINES)
 
+ifeq ($(KERNEL_BUILD), 0)
 KBUILD_EXTRA_SYMBOLS +=$(OUT)/obj/vendor/qcom/opensource/audio-kernel/dsp/Module.symvers
+endif
+
 # Currently, for versions of gcc which support it, the kernel Makefile
 # is disabling the maybe-uninitialized warning.  Re-enable it for the
 # AUDIO driver.  Note that we must use EXTRA_CFLAGS here so that it