Handle WoV phrase detection notification and kcontrols

sound/soc/sof/Makefile

@@ -12,7 +12,7 @@ snd-sof-$(CONFIG_SND_SOC_SOF_COMPRESS) += ipc3-compress.o
 endif
 ifneq ($(CONFIG_SND_SOC_SOF_IPC4),)
 snd-sof-y += ipc4.o ipc4-loader.o ipc4-topology.o ipc4-control.o ipc4-pcm.o\
-		ipc4-mtrace.o ipc4-telemetry.o
+		ipc4-mtrace.o ipc4-telemetry.o ipc4-wov.o
 snd-sof-$(CONFIG_SND_SOC_SOF_COMPRESS) += ipc4-compress.o
 endif
 

sound/soc/sof/ipc4-wov.c

@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+//
+// Copyright(c) 2026 Intel Corporation
+
+#include <linux/bits.h>
+#include <sound/pcm.h>
+#include <sound/control.h>
+#include <sound/soc.h>
+#include "sof-audio.h"
+#include "sof-priv.h"
+#include "ipc4-wov.h"
+
+/* IPC4 PHRASE_DETECTED primary/extension field layout */
+#define SOF_IPC4_PHRASE_WORD_ID_MASK	GENMASK(15, 0)
+#define SOF_IPC4_PHRASE_WORD_ID_SHIFT	0
+#define SOF_IPC4_PHRASE_SV_SCORE_MASK	GENMASK(15, 0)
+
+/* PCM ID for WoV keyword detection capture stream */
+#define SOF_WOV_PCM_ID	11
+
+/* kcontrol names as defined in the dmic-wov feature topology */
+#define SOF_WOV_KEYWORD_ID_CTL	"wov_trigger_id"
+#define SOF_WOV_EVENT_CTL	"wov_event"
+
+/* sof_ipc4_wov_notify_kcontrol_by_name - Locate mixer control by name and notify */
+static void sof_ipc4_wov_notify_kcontrol_by_name(struct snd_card *card,
+						 const char *name)
+{
+	struct snd_ctl_elem_id id;
+	struct snd_kcontrol *kctl;
+
+	if (!card || !name)
+		return;
+
+	memset(&id, 0, sizeof(id));
+	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+	strscpy(id.name, name, sizeof(id.name));
+
+	kctl = snd_ctl_find_id(card, &id);
+	if (kctl)
+		snd_ctl_notify_one(card, SNDRV_CTL_EVENT_MASK_VALUE, kctl, 0);
+}
+
+/* sof_ipc4_wov_notify_kcontrols - Iterate SOF controls and notify userspace */
+static void sof_ipc4_wov_notify_kcontrols(struct snd_sof_dev *sdev)
+{
+	static const char * const wov_ctl_names[] = {
+		SOF_WOV_KEYWORD_ID_CTL,
+		SOF_WOV_EVENT_CTL,
+	};
+	struct snd_sof_control *scontrol;
+	int i;
+
+	list_for_each_entry(scontrol, &sdev->kcontrol_list, list) {
+		for (i = 0; i < ARRAY_SIZE(wov_ctl_names); i++) {
+			if (strcmp(scontrol->name, wov_ctl_names[i]))
+				continue;
+
+			/* Force firmware re-read on next .get */
+			scontrol->comp_data_dirty = true;
+
+			if (scontrol->scomp && scontrol->scomp->card) {
+				sof_ipc4_wov_notify_kcontrol_by_name(
+					scontrol->scomp->card->snd_card,
+					scontrol->name);
+			}
+		}
+	}
+}
+
+void sof_ipc4_wov_phrase_detected(struct snd_sof_dev *sdev,
+				  struct sof_ipc4_msg *ipc4_msg)
+{
+	struct snd_sof_pcm *spcm;
+	struct snd_pcm_substream *substream;
+	u32 word_id = (ipc4_msg->primary & SOF_IPC4_PHRASE_WORD_ID_MASK)
+			>> SOF_IPC4_PHRASE_WORD_ID_SHIFT;
+	u32 sv_score = ipc4_msg->extension & SOF_IPC4_PHRASE_SV_SCORE_MASK;
+
+	dev_dbg(sdev->dev, "WoV: PHRASE_DETECTED word_id=%u sv_score=%u\n",
+		word_id, sv_score);
+
+	pm_wakeup_event(sdev->dev, 2000);
+
+	/* 1. Notify WoV kcontrols */
+	sof_ipc4_wov_notify_kcontrols(sdev);
+
+	/* 2. Unblock capture PCM stream */
+	list_for_each_entry(spcm, &sdev->pcm_list, list) {
+		if (le32_to_cpu(spcm->pcm.pcm_id) != SOF_WOV_PCM_ID)
+			continue;
+
+		substream = spcm->stream[SNDRV_PCM_STREAM_CAPTURE].substream;
+		if (!substream || !substream->runtime) {
+			dev_warn(sdev->dev, "WoV: PCM %d not open\n",
+				 SOF_WOV_PCM_ID);
+			return;
+		}
+
+		snd_sof_pcm_period_elapsed(substream);
+		return;
+	}
+
+	dev_warn(sdev->dev, "WoV: PHRASE_DETECTED but PCM %d not found\n",
+		 SOF_WOV_PCM_ID);
+}

sound/soc/sof/ipc4-wov.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/* Copyright(c) 2026 Intel Corporation */
+
+#ifndef __SOF_IPC4_WOV_H
+#define __SOF_IPC4_WOV_H
+
+#include "sof-priv.h"
+#include "ipc4-priv.h"
+
+void sof_ipc4_wov_phrase_detected(struct snd_sof_dev *sdev,
+				  struct sof_ipc4_msg *ipc4_msg);
+
+#endif /* __SOF_IPC4_WOV_H */

sound/soc/sof/ipc4.c

@@ -15,6 +15,7 @@
 #include "sof-audio.h"
 #include "ipc4-fw-reg.h"
 #include "ipc4-priv.h"
+#include "ipc4-wov.h"
 #include "ipc4-topology.h"
 #include "ipc4-telemetry.h"
 #include "ops.h"
@@ -840,6 +841,9 @@ static void sof_ipc4_rx_msg(struct snd_sof_dev *sdev)
 	case SOF_IPC4_NOTIFY_EXCEPTION_CAUGHT:
 		snd_sof_dsp_panic(sdev, 0, true);
 		break;
+	case SOF_IPC4_NOTIFY_PHRASE_DETECTED:
+		sof_ipc4_wov_phrase_detected(sdev, ipc4_msg);
+		break;
 	case SOF_IPC4_NOTIFY_MODULE_NOTIFICATION:
 		data_size = sizeof(struct sof_ipc4_notify_module_data);
 		handler_func = sof_ipc4_module_notification_handler;