Add a new module named prebuilt_dsp.

prebuilt_dsp soong module allows to install DSP related file to
<partition>/etc/dsp directory. If soc_specific property is enabled
to true, it is then installed to <partition>/dsp directory for
vendor image.

Bug: b/157259542
Test: Wrote unit test cases.
Change-Id: I15431a14bf399338a00835718dfe29544be02e34

etc/prebuilt_etc.go

@@ -35,6 +35,7 @@ func init() {
 	android.RegisterModuleType("prebuilt_usr_share_host", PrebuiltUserShareHostFactory)
 	android.RegisterModuleType("prebuilt_font", PrebuiltFontFactory)
 	android.RegisterModuleType("prebuilt_firmware", PrebuiltFirmwareFactory)
+	android.RegisterModuleType("prebuilt_dsp", PrebuiltDSPFactory)
 }
 
 type prebuiltEtcProperties struct {
@@ -293,3 +294,15 @@ func PrebuiltFirmwareFactory() android.Module {
 	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
 	return module
 }
+
+// prebuilt_dsp installs a DSP related file to <partition>/etc/dsp directory for system image.
+// If soc_specific property is set to true, the DSP related file is installed to the vendor <partition>/dsp
+// directory for vendor image.
+func PrebuiltDSPFactory() android.Module {
+	module := &PrebuiltEtc{}
+	module.socInstallDirBase = "dsp"
+	InitPrebuiltEtcModule(module, "etc/dsp")
+	// This module is device-only
+	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
+	return module
+}

etc/prebuilt_etc_test.go

@@ -65,6 +65,7 @@ func testPrebuiltEtc(t *testing.T, bp string) (*android.TestContext, android.Con
 	ctx.RegisterModuleType("prebuilt_usr_share_host", PrebuiltUserShareHostFactory)
 	ctx.RegisterModuleType("prebuilt_font", PrebuiltFontFactory)
 	ctx.RegisterModuleType("prebuilt_firmware", PrebuiltFirmwareFactory)
+	ctx.RegisterModuleType("prebuilt_dsp", PrebuiltDSPFactory)
 	ctx.Register(config)
 	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
 	android.FailIfErrored(t, errs)
@@ -281,3 +282,39 @@ func TestPrebuiltFirmwareDirPath(t *testing.T) {
 		})
 	}
 }
+
+func TestPrebuiltDSPDirPath(t *testing.T) {
+	targetPath := filepath.Join(buildDir, "/target/product/test_device")
+	tests := []struct {
+		description  string
+		config       string
+		expectedPath string
+	}{{
+		description: "prebuilt: system dsp",
+		config: `
+			prebuilt_dsp {
+				name: "foo.conf",
+				src: "foo.conf",
+			}`,
+		expectedPath: filepath.Join(targetPath, "system/etc/dsp"),
+	}, {
+		description: "prebuilt: vendor dsp",
+		config: `
+			prebuilt_dsp {
+				name: "foo.conf",
+				src: "foo.conf",
+				soc_specific: true,
+				sub_dir: "sub_dir",
+			}`,
+		expectedPath: filepath.Join(targetPath, "vendor/dsp/sub_dir"),
+	}}
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			ctx, _ := testPrebuiltEtc(t, tt.config)
+			p := ctx.ModuleForTests("foo.conf", "android_arm64_armv8-a").Module().(*PrebuiltEtc)
+			if p.installDirPath.String() != tt.expectedPath {
+				t.Errorf("expected %q, got %q", tt.expectedPath, p.installDirPath)
+			}
+		})
+	}
+}