Message-Id: <20250526-dualsense-alsa-jack-v1-9-1a821463b632@collabora.com>
Date: Mon, 26 May 2025 17:07:48 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: kernel@...labora.com, linux-sound@...r.kernel.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] ALSA: usb-audio: Add mixer quirk for Sony DualSense
 PS5

The Sony DualSense wireless controller (PS5) features an internal mono
speaker, but it also provides a 3.5mm jack socket for headphone output
and headset microphone input.

Since this is a UAC1 device, it doesn't advertise any jack detection
capability.  However, the controller is able to report HP & MIC insert
events via HID, i.e. through a dedicated input device managed by the
hid-playstation driver.

Add a quirk to create the jack controls for headphone and headset mic,
respectively, and setup an input handler for each of them in order to
intercept the related hotplug events.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 sound/usb/mixer_quirks.c | 263 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 263 insertions(+)

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index ffda3b8d42cc6b05ea26726616196a012cb6d1e4..0769ecd9114401007472b66d3ee728a33804de0e 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -17,6 +17,7 @@
 #include <linux/bitfield.h>
 #include <linux/hid.h>
 #include <linux/init.h>
+#include <linux/input.h>
 #include <linux/math64.h>
 #include <linux/slab.h>
 #include <linux/usb.h>
@@ -531,6 +532,263 @@ static int snd_emu0204_controls_create(struct usb_mixer_interface *mixer)
 					  &snd_emu0204_control, NULL);
 }
 
+/*
+ * Sony DualSense controller (PS5) jack detection
+ *
+ * Since this is an UAC 1 device, it doesn't support jack detection.
+ * However, the controller hid-playstation driver reports HP & MIC
+ * insert events through a dedicated input device.
+ */
+
+#define SND_DUALSENSE_JACK_OUT_TERM_ID 3
+#define SND_DUALSENSE_JACK_IN_TERM_ID 4
+
+struct dualsense_mixer_elem_info {
+	struct usb_mixer_elem_info info;
+	struct input_handler ih;
+	struct input_device_id id_table[2];
+	bool connected;
+};
+
+static void snd_dualsense_ih_event(struct input_handle *handle,
+				   unsigned int type, unsigned int code,
+				   int value)
+{
+	struct dualsense_mixer_elem_info *mei;
+	struct usb_mixer_elem_list *me;
+
+	if (type != EV_SW)
+		return;
+
+	mei = container_of(handle->handler, struct dualsense_mixer_elem_info, ih);
+	me = &mei->info.head;
+
+	if ((me->id == SND_DUALSENSE_JACK_OUT_TERM_ID && code == SW_HEADPHONE_INSERT) ||
+	    (me->id == SND_DUALSENSE_JACK_IN_TERM_ID && code == SW_MICROPHONE_INSERT)) {
+		mei->connected = !!value;
+		snd_ctl_notify(me->mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+			       &me->kctl->id);
+	}
+}
+
+static bool snd_dualsense_ih_match(struct input_handler *handler,
+				   struct input_dev *dev)
+{
+	struct dualsense_mixer_elem_info *mei;
+	struct usb_device *snd_dev;
+	char *input_dev_path, *usb_dev_path;
+	size_t usb_dev_path_len;
+	bool match = false;
+
+	mei = container_of(handler, struct dualsense_mixer_elem_info, ih);
+	snd_dev = mei->info.head.mixer->chip->dev;
+
+	input_dev_path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
+	if (!input_dev_path) {
+		dev_warn(&snd_dev->dev, "Failed to get input dev path\n");
+		return false;
+	}
+
+	usb_dev_path = kobject_get_path(&snd_dev->dev.kobj, GFP_KERNEL);
+	if (!usb_dev_path) {
+		dev_warn(&snd_dev->dev, "Failed to get USB dev path\n");
+		goto free_paths;
+	}
+
+	/*
+	 * Ensure the VID:PID matched input device supposedly owned by the
+	 * hid-playstation driver belongs to the actual hardware handled by
+	 * the current USB audio device, which implies input_dev_path being
+	 * a subpath of usb_dev_path.
+	 *
+	 * This verification is necessary when there is more than one identical
+	 * controller attached to the host system.
+	 */
+	usb_dev_path_len = strlen(usb_dev_path);
+	if (usb_dev_path_len >= strlen(input_dev_path))
+		goto free_paths;
+
+	usb_dev_path[usb_dev_path_len] = '/';
+	match = !memcmp(input_dev_path, usb_dev_path, usb_dev_path_len + 1);
+
+free_paths:
+	kfree(input_dev_path);
+	kfree(usb_dev_path);
+
+	return match;
+}
+
+static int snd_dualsense_ih_connect(struct input_handler *handler,
+				    struct input_dev *dev,
+				    const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int err;
+
+	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = handler->name;
+
+	err = input_register_handle(handle);
+	if (err)
+		goto err_free;
+
+	err = input_open_device(handle);
+	if (err)
+		goto err_unregister;
+
+	return 0;
+
+err_unregister:
+	input_unregister_handle(handle);
+err_free:
+	kfree(handle);
+	return err;
+}
+
+static void snd_dualsense_ih_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static void snd_dualsense_ih_start(struct input_handle *handle)
+{
+	struct dualsense_mixer_elem_info *mei;
+	struct usb_mixer_elem_list *me;
+	int status = -1;
+
+	mei = container_of(handle->handler, struct dualsense_mixer_elem_info, ih);
+	me = &mei->info.head;
+
+	if (me->id == SND_DUALSENSE_JACK_OUT_TERM_ID &&
+	    test_bit(SW_HEADPHONE_INSERT, handle->dev->swbit))
+		status = test_bit(SW_HEADPHONE_INSERT, handle->dev->sw);
+	else if (me->id == SND_DUALSENSE_JACK_IN_TERM_ID &&
+		 test_bit(SW_MICROPHONE_INSERT, handle->dev->swbit))
+		status = test_bit(SW_MICROPHONE_INSERT, handle->dev->sw);
+
+	if (status >= 0) {
+		mei->connected = !!status;
+		snd_ctl_notify(me->mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+			       &me->kctl->id);
+	}
+}
+
+static int snd_dualsense_jack_get(struct snd_kcontrol *kctl,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct dualsense_mixer_elem_info *mei = snd_kcontrol_chip(kctl);
+
+	ucontrol->value.integer.value[0] = mei->connected;
+
+	return 0;
+}
+
+static const struct snd_kcontrol_new snd_dualsense_jack_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
+	.access = SNDRV_CTL_ELEM_ACCESS_READ,
+	.info = snd_ctl_boolean_mono_info,
+	.get = snd_dualsense_jack_get,
+};
+
+static int snd_dualsense_resume_jack(struct usb_mixer_elem_list *list)
+{
+	snd_ctl_notify(list->mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+		       &list->kctl->id);
+	return 0;
+}
+
+static void snd_dualsense_mixer_elem_free(struct snd_kcontrol *kctl)
+{
+	struct dualsense_mixer_elem_info *mei = snd_kcontrol_chip(kctl);
+
+	if (mei->ih.event)
+		input_unregister_handler(&mei->ih);
+
+	snd_usb_mixer_elem_free(kctl);
+}
+
+static int snd_dualsense_jack_create(struct usb_mixer_interface *mixer,
+				     const char *name, bool is_output)
+{
+	struct dualsense_mixer_elem_info *mei;
+	struct input_device_id *idev_id;
+	struct snd_kcontrol *kctl;
+	int err;
+
+	mei = kzalloc(sizeof(*mei), GFP_KERNEL);
+	if (!mei)
+		return -ENOMEM;
+
+	snd_usb_mixer_elem_init_std(&mei->info.head, mixer,
+				    is_output ? SND_DUALSENSE_JACK_OUT_TERM_ID :
+						SND_DUALSENSE_JACK_IN_TERM_ID);
+
+	mei->info.head.resume = snd_dualsense_resume_jack;
+	mei->info.val_type = USB_MIXER_BOOLEAN;
+	mei->info.channels = 1;
+	mei->info.min = 0;
+	mei->info.max = 1;
+
+	kctl = snd_ctl_new1(&snd_dualsense_jack_control, mei);
+	if (!kctl) {
+		kfree(mei);
+		return -ENOMEM;
+	}
+
+	strscpy(kctl->id.name, name, sizeof(kctl->id.name));
+	kctl->private_free = snd_dualsense_mixer_elem_free;
+
+	err = snd_usb_mixer_add_control(&mei->info.head, kctl);
+	if (err)
+		return err;
+
+	idev_id = &mei->id_table[0];
+	idev_id->flags = INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT |
+			 INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT;
+	idev_id->vendor = USB_ID_VENDOR(mixer->chip->usb_id);
+	idev_id->product = USB_ID_PRODUCT(mixer->chip->usb_id);
+	idev_id->evbit[BIT_WORD(EV_SW)] = BIT_MASK(EV_SW);
+	if (is_output)
+		idev_id->swbit[BIT_WORD(SW_HEADPHONE_INSERT)] = BIT_MASK(SW_HEADPHONE_INSERT);
+	else
+		idev_id->swbit[BIT_WORD(SW_MICROPHONE_INSERT)] = BIT_MASK(SW_MICROPHONE_INSERT);
+
+	mei->ih.event = snd_dualsense_ih_event;
+	mei->ih.match = snd_dualsense_ih_match;
+	mei->ih.connect = snd_dualsense_ih_connect,
+	mei->ih.disconnect = snd_dualsense_ih_disconnect,
+	mei->ih.start = snd_dualsense_ih_start,
+	mei->ih.name = name;
+	mei->ih.id_table = mei->id_table;
+
+	err = input_register_handler(&mei->ih);
+	if (err) {
+		dev_warn(&mixer->chip->dev->dev,
+			 "Could not register input handler: %d\n", err);
+		mei->ih.event = NULL;
+	}
+
+	return 0;
+}
+
+static int snd_dualsense_controls_create(struct usb_mixer_interface *mixer)
+{
+	int err;
+
+	err = snd_dualsense_jack_create(mixer, "Headphone Jack", true);
+	if (err < 0)
+		return err;
+
+	return snd_dualsense_jack_create(mixer, "Headset Mic Jack", false);
+}
+
 /* ASUS Xonar U1 / U3 controls */
 
 static int snd_xonar_u1_switch_get(struct snd_kcontrol *kcontrol,
@@ -4073,6 +4331,11 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 		err = snd_emu0204_controls_create(mixer);
 		break;
 
+	case USB_ID(0x054c, 0x0ce6): /* Sony DualSense controller (PS5) */
+	case USB_ID(0x054c, 0x0df2): /* Sony DualSense Edge controller (PS5) */
+		err = snd_dualsense_controls_create(mixer);
+		break;
+
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C400 */
 		err = snd_c400_create_mixer(mixer);

-- 
2.49.0

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