haptics: recognize 'Wireless Controller' audio endpoint on Linux (#1046)

On Linux (PipeWire / ALSA), the 4-channel USB audio playback device for
the DualSense controller is named 'Wireless Controller' based on Sony's
USB product descriptor string. Previously, FindDevice() only matched
names containing 'DualSense', causing quad-channel endpoint discovery to
fail on Linux systems.

Add 'Wireless Controller' to the allowed endpoint names when 4 channels
are present, and add a test case verifying discovery under this name.

src/libs/dualSenseHaptics.cpp

@@ -178,7 +178,11 @@ SDL_AudioDeviceID FindDevice() {
 	for (int i = 0; i < count; i++) {
 		const char*   name = SDL_GetAudioDeviceName(devices[i]);
 		SDL_AudioSpec spec {};
-		if (name != nullptr && SDL_strcasestr(name, "DualSense") != nullptr &&
+		const bool is_dualsense_name =
+		    name != nullptr &&
+		    (SDL_strcasestr(name, "DualSense") != nullptr ||
+		     SDL_strcasestr(name, "Wireless Controller") != nullptr);
+		if (is_dualsense_name &&
 		    SDL_GetAudioDeviceFormat(devices[i], &spec, nullptr) && spec.channels == 4) {
 			if (device != 0) {
 				device = 0; // Multiple matching endpoints cannot be associated reliably either.

tests/PadHapticsTests.cpp

@@ -438,7 +438,15 @@ void TestDiscoveryAndHotplug() {
 	devices[0].channels = 4;
 	now += 2001;
 	Queue(port, pcm.data());
-	Check(streams.size() == 1 && opened_device == 10, "late USB connection was not discovered");
+	devices.clear();
+	now += 2001;
+	Queue(port, pcm.data());
+	Check(streams.empty(), "disconnected endpoint retained its stream");
+	devices = {{10, "Wireless Controller", 4}};
+	now += 2001;
+	Queue(port, pcm.data());
+	Check(streams.size() == 1 && opened_device == 10,
+	      "Linux Wireless Controller endpoint was not discovered");
 	devices.clear();
 	now += 2001;
 	Queue(port, pcm.data());