audio: dsm: add stub for maxim dsm

Add a stub for the library so fuzzers and CI can compile the adapter

Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>

src/audio/smart_amp/CMakeLists.txt

@@ -4,6 +4,10 @@ add_local_sources(sof smart_amp.c smart_amp_generic.c)
 
 if(CONFIG_MAXIM_DSM)
 add_local_sources(sof smart_amp_maxim_dsm.c)
+if(CONFIG_MAXIM_DSM_STUB)
+add_local_sources(sof maxim_dsm_stub.c)
+else()
 sof_add_static_library(dsm ${CMAKE_CURRENT_LIST_DIR}/lib/release/dsm_lib/libdsm.a)
+endif()
 target_include_directories(sof PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include/dsm_api/inc)
 endif()

src/audio/smart_amp/Kconfig

@@ -5,6 +5,7 @@ menu "Smart amplifier solutions"
 
 	config MAXIM_DSM
 		bool "Maxim DSM solution"
+		select MAXIM_DSM_STUB if COMP_STUBS
 		default n
 		help
 		  Select to apply Maxim DSM(Dynamic Speaker Management) solution
@@ -13,5 +14,13 @@ menu "Smart amplifier solutions"
 		  building the FW binary with this option enabled. The library
 		  itself should be statically linked with the SoF FW binary image.
 
+	config MAXIM_DSM_STUB
+		bool "Maxim DSM solution"
+		depends on MAXIM_DSM
+		default n
+		help
+		  Select to build the Maxim DSM adapter with a stub library. This
+		  should only be used for CI and testing.
+
 endmenu
 

src/audio/smart_amp/maxim_dsm_stub.c

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//
+// Copyright(c) 2023 Google LLC. All rights reserved.
+//
+// Author: Curtis Malainey <cujomalainey@chromium.org>
+//
+
+#include "dsm_api_public.h"
+
+enum DSM_API_MESSAGE dsm_api_get_mem(struct dsm_api_memory_size_ext_t *iopmmemparam,
+				     int iparamsize)
+{
+	return DSM_API_OK;
+}
+
+enum DSM_API_MESSAGE dsm_api_init(void *ipmodulehandler,
+				  struct dsm_api_init_ext_t *iopparamstruct,
+				  int iparamsize)
+{
+	return DSM_API_OK;
+}
+
+enum DSM_API_MESSAGE dsm_api_ff_process(void *ipmodulehandler,
+					int channelmask,
+					short *ibufferorg,
+					int *ipnrsamples,
+					short *obufferorg,
+					int *opnrsamples)
+{
+	return DSM_API_OK;
+}
+
+enum DSM_API_MESSAGE dsm_api_fb_process(void *ipmodulehandler,
+					int ichannelmask,
+					short *icurrbuffer,
+					short *ivoltbuffer,
+					int *iopnrsamples)
+{
+	return DSM_API_OK;
+}
+
+enum DSM_API_MESSAGE dsm_api_set_params(void *ipmodulehandler,
+					int icommandnumber, void *ipparamsbuffer)
+{
+	return DSM_API_OK;
+}
+
+enum DSM_API_MESSAGE dsm_api_get_params(void *ipmodulehandler,
+					int icommandnumber, void *opparams)
+{
+	return DSM_API_OK;
+}

zephyr/CMakeLists.txt

@@ -646,6 +646,10 @@ zephyr_include_directories_ifdef(CONFIG_MAXIM_DSM
 	${SOF_AUDIO_PATH}/smart_amp/include/dsm_api/inc/
 )
 
+zephyr_library_sources_ifdef(CONFIG_MAXIM_DSM_STUB
+	${SOF_AUDIO_PATH}/smart_amp/maxim_dsm_stub.c
+)
+
 zephyr_library_sources_ifdef(CONFIG_COMP_ARIA
 	${SOF_AUDIO_PATH}/aria/aria.c
 	${SOF_AUDIO_PATH}/aria/aria_hifi3.c