wlan_platform: Add Makefile and Kbuild to build CNSS drivers

Add default Makefile and Kbuild so that CNSS family drivers can be
built directly as kernel modules.

Change-Id: I36636613220a4859b07c0069d83f3d62d39bbec2

Kbuild

@@ -0,0 +1,22 @@
+ifeq ($(CONFIG_CNSS_OUT_OF_TREE),y)
+KBUILD_CPPFLAGS += -DCONFIG_CNSS_OUT_OF_TREE
+endif
+
+ifeq ($(CONFIG_CNSS2_DEBUG),y)
+KBUILD_CPPFLAGS += -DCONFIG_CNSS2_DEBUG
+endif
+
+ifeq ($(CONFIG_CNSS2_QMI),y)
+KBUILD_CPPFLAGS += -DCONFIG_CNSS2_QMI
+endif
+
+# CONFIG_CNSS_PLAT_IPC_QMI_SVC should never be "y" here since it
+# can be only compiled as a module from out-of-kernel-tree source.
+ifeq ($(CONFIG_CNSS_PLAT_IPC_QMI_SVC),m)
+KBUILD_CPPFLAGS += -DCONFIG_CNSS_PLAT_IPC_QMI_SVC
+endif
+
+obj-$(CONFIG_CNSS2) += cnss2/
+obj-$(CONFIG_CNSS_GENL) += cnss_genl/
+obj-$(CONFIG_WCNSS_MEM_PRE_ALLOC) += cnss_prealloc/
+obj-y += cnss_utils/

Makefile

@@ -0,0 +1,30 @@
+KERNEL_SRC ?= /lib/modules/$(shell uname -r)/build
+M ?= $(shell pwd)
+
+# $(WLAN_PLATFORM_ROOT) has to be a absolute path
+ifeq ($(WLAN_PLATFORM_ROOT),)
+WLAN_PLATFORM_ROOT = $(shell pwd)
+
+# If it reaches here, compilation is probably without Android.mk,
+# so enable all flags (including debug flag CONFIG_CNSS2_DEBUG) by
+# default.
+KBUILD_OPTIONS := WLAN_PLATFORM_ROOT=$(WLAN_PLATFORM_ROOT)
+KBUILD_OPTIONS += CONFIG_CNSS_OUT_OF_TREE=y
+KBUILD_OPTIONS += CONFIG_CNSS2=m
+KBUILD_OPTIONS += CONFIG_CNSS2_QMI=y
+KBUILD_OPTIONS += CONFIG_CNSS2_DEBUG=y
+KBUILD_OPTIONS += CONFIG_CNSS_QMI_SVC=m
+KBUILD_OPTIONS += CONFIG_CNSS_PLAT_IPC_QMI_SVC=m
+KBUILD_OPTIONS += CONFIG_CNSS_GENL=m
+KBUILD_OPTIONS += CONFIG_WCNSS_MEM_PRE_ALLOC=m
+KBUILD_OPTIONS += CONFIG_CNSS_UTILS=m
+endif
+
+all:
+	$(MAKE) -C $(KERNEL_SRC) M=$(M) modules $(KBUILD_OPTIONS)
+
+modules_install:
+	$(MAKE) INSTALL_MOD_STRIP=1 -C $(KERNEL_SRC) M=$(M) modules_install
+
+clean:
+	$(MAKE) -C $(KERNEL_SRC) M=$(M) clean