ASoC: cs35l56: Add KUnit testing of cs35l56_set_fw_suffix()

Add a new KUnit test for testing the creation of firmware name
qualifiers in the cs35l56 driver. The initial set of test cases
are for cs35l56_set_fw_suffix().

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260121132243.1256019-6-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: rfvirgil

sound/soc/codecs/Kconfig

@@ -933,6 +933,19 @@ config SND_SOC_CS35L56_CAL_SET_CTRL
 	  On most platforms this is not needed.
 
 	  If unsure select "N".
+
+config SND_SOC_CS35L56_TEST
+	tristate "KUnit test for Cirrus Logic cs35l56 driver" if !KUNIT_ALL_TESTS
+	depends on SND_SOC_CS35L56 && KUNIT
+	default KUNIT_ALL_TESTS
+	select SND_SOC_CS_AMP_LIB_TEST_HOOKS
+	help
+	  This builds KUnit tests for the Cirrus Logic cs35l56
+	  codec driver.
+	  For more information on KUnit and unit tests in general,
+	  please refer to the KUnit documentation in
+	  Documentation/dev-tools/kunit/.
+	  If in doubt, say "N".
 endmenu
 
 config SND_SOC_CS40L50

sound/soc/codecs/Makefile

@@ -81,6 +81,7 @@ snd-soc-cs35l56-shared-y := cs35l56-shared.o
 snd-soc-cs35l56-i2c-y := cs35l56-i2c.o
 snd-soc-cs35l56-spi-y := cs35l56-spi.o
 snd-soc-cs35l56-sdw-y := cs35l56-sdw.o
+snd-soc-cs35l56-test-y := cs35l56-test.o
 snd-soc-cs40l50-y := cs40l50-codec.o
 snd-soc-cs42l42-y := cs42l42.o
 snd-soc-cs42l42-i2c-y := cs42l42-i2c.o
@@ -516,6 +517,7 @@ obj-$(CONFIG_SND_SOC_CS35L56_SHARED)	+= snd-soc-cs35l56-shared.o
 obj-$(CONFIG_SND_SOC_CS35L56_I2C)	+= snd-soc-cs35l56-i2c.o
 obj-$(CONFIG_SND_SOC_CS35L56_SPI)	+= snd-soc-cs35l56-spi.o
 obj-$(CONFIG_SND_SOC_CS35L56_SDW)	+= snd-soc-cs35l56-sdw.o
+obj-$(CONFIG_SND_SOC_CS35L56_TEST)	+= snd-soc-cs35l56-test.o
 obj-$(CONFIG_SND_SOC_CS40L50)		+= snd-soc-cs40l50.o
 obj-$(CONFIG_SND_SOC_CS42L42_CORE)	+= snd-soc-cs42l42.o
 obj-$(CONFIG_SND_SOC_CS42L42)	+= snd-soc-cs42l42-i2c.o

sound/soc/codecs/cs-amp-lib.c

@@ -806,6 +806,9 @@ const char *cs_amp_devm_get_vendor_specific_variant_id(struct device *dev,
 						       int ssid_vendor,
 						       int ssid_device)
 {
+	KUNIT_STATIC_STUB_REDIRECT(cs_amp_devm_get_vendor_specific_variant_id,
+				   dev, ssid_vendor, ssid_device);
+
 	if ((ssid_vendor == PCI_VENDOR_ID_DELL) || (ssid_vendor < 0))
 		return cs_amp_devm_get_dell_ssidex(dev, ssid_vendor, ssid_device);