ASoC: fsl_micfil: Add Hardware Voice Activity Detector support

diff --git a/sound/soc/fsl/fsl_micfil.c b/sound/soc/fsl/fsl_micfil.c
index 79ef4e269bc9..eeaa75fb9196 100644
--- a/sound/soc/fsl/fsl_micfil.c
+++ b/sound/soc/fsl/fsl_micfil.c
@@ -47,11 +47,15 @@  struct fsl_micfil {
 	struct clk *pll11k_clk;
 	struct snd_dmaengine_dai_dma_data dma_params_rx;
 	struct sdma_peripheral_config sdmacfg;
+	struct snd_soc_card *card;
 	unsigned int dataline;
 	char name[32];
 	int irq[MICFIL_IRQ_LINES];
 	enum quality quality;
 	int dc_remover;
+	int vad_init_mode;
+	int vad_enabled;
+	int vad_detected;
 };
 
 struct fsl_micfil_soc_data {
@@ -152,6 +156,152 @@  static int micfil_quality_set(struct snd_kcontrol *kcontrol,
 	return micfil_set_quality(micfil);
 }
 
+static const char * const micfil_hwvad_enable[] = {
+	"Disable (Record only)",
+	"Enable (Record with Vad)",
+};
+
+static const char * const micfil_hwvad_init_mode[] = {
+	"Envelope mode", "Energy mode",
+};
+
+static const char * const micfil_hwvad_hpf_texts[] = {
+	"Filter bypass",
+	"Cut-off @1750Hz",
+	"Cut-off @215Hz",
+	"Cut-off @102Hz",
+};
+
+/*
+ * DC Remover Control
+ * Filter Bypassed	1 1
+ * Cut-off @21Hz	0 0
+ * Cut-off @83Hz	0 1
+ * Cut-off @152HZ	1 0
+ */
+static const char * const micfil_dc_remover_texts[] = {
+	"Cut-off @21Hz", "Cut-off @83Hz",
+	"Cut-off @152Hz", "Bypass",
+};
+
+static const struct soc_enum hwvad_enable_enum =
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(micfil_hwvad_enable),
+			    micfil_hwvad_enable);
+static const struct soc_enum hwvad_init_mode_enum =
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(micfil_hwvad_init_mode),
+			    micfil_hwvad_init_mode);
+static const struct soc_enum hwvad_hpf_enum =
+	SOC_ENUM_SINGLE(REG_MICFIL_VAD0_CTRL2, 0,
+			ARRAY_SIZE(micfil_hwvad_hpf_texts),
+			micfil_hwvad_hpf_texts);
+static const struct soc_enum fsl_micfil_dc_remover_enum =
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(micfil_dc_remover_texts),
+			    micfil_dc_remover_texts);
+
+static int micfil_put_dc_remover_state(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *ucontrol)
+{
+	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+	unsigned int *item = ucontrol->value.enumerated.item;
+	int val = snd_soc_enum_item_to_val(e, item[0]);
+	int i = 0, ret = 0;
+	u32 reg_val = 0;
+
+	if (val < 0 || val > 3)
+		return -EINVAL;
+
+	micfil->dc_remover = val;
+
+	/* Calculate total value for all channels */
+	for (i = 0; i < MICFIL_OUTPUT_CHANNELS; i++)
+		reg_val |= val << MICFIL_DC_CHX_SHIFT(i);
+
+	/* Update DC Remover mode for all channels */
+	ret = snd_soc_component_update_bits(comp, REG_MICFIL_DC_CTRL,
+					    MICFIL_DC_CTRL_CONFIG, reg_val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int micfil_get_dc_remover_state(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+
+	ucontrol->value.enumerated.item[0] = micfil->dc_remover;
+
+	return 0;
+}
+
+static int hwvad_put_enable(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+	unsigned int *item = ucontrol->value.enumerated.item;
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+	int val = snd_soc_enum_item_to_val(e, item[0]);
+
+	micfil->vad_enabled = val;
+
+	return 0;
+}
+
+static int hwvad_get_enable(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+
+	ucontrol->value.enumerated.item[0] = micfil->vad_enabled;
+
+	return 0;
+}
+
+static int hwvad_put_init_mode(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+	unsigned int *item = ucontrol->value.enumerated.item;
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+	int val = snd_soc_enum_item_to_val(e, item[0]);
+
+	/* 0 - Envelope-based Mode
+	 * 1 - Energy-based Mode
+	 */
+	micfil->vad_init_mode = val;
+
+	return 0;
+}
+
+static int hwvad_get_init_mode(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+
+	ucontrol->value.enumerated.item[0] = micfil->vad_init_mode;
+
+	return 0;
+}
+
+static int hwvad_detected(struct snd_kcontrol *kcontrol,
+			  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+	struct fsl_micfil *micfil = snd_soc_component_get_drvdata(comp);
+
+	ucontrol->value.enumerated.item[0] = micfil->vad_detected;
+
+	return 0;
+}
+
 static const struct snd_kcontrol_new fsl_micfil_snd_controls[] = {
 	SOC_SINGLE_SX_TLV("CH0 Volume", REG_MICFIL_OUT_CTRL,
 			  MICFIL_OUTGAIN_CHX_SHIFT(0), 0xF, 0x7, gain_tlv),
@@ -172,6 +322,27 @@  static const struct snd_kcontrol_new fsl_micfil_snd_controls[] = {
 	SOC_ENUM_EXT("MICFIL Quality Select",
 		     fsl_micfil_quality_enum,
 		     micfil_quality_get, micfil_quality_set),
+	SOC_ENUM_EXT("HWVAD Enablement Switch", hwvad_enable_enum,
+		     hwvad_get_enable, hwvad_put_enable),
+	SOC_ENUM_EXT("HWVAD Initialization Mode", hwvad_init_mode_enum,
+		     hwvad_get_init_mode, hwvad_put_init_mode),
+	SOC_ENUM("HWVAD High-Pass Filter", hwvad_hpf_enum),
+	SOC_SINGLE("HWVAD ZCD Switch", REG_MICFIL_VAD0_ZCD, 0, 1, 0),
+	SOC_SINGLE("HWVAD ZCD Auto Threshold Switch",
+		   REG_MICFIL_VAD0_ZCD, 2, 1, 0),
+	SOC_ENUM_EXT("MICFIL DC Remover Control", fsl_micfil_dc_remover_enum,
+		     micfil_get_dc_remover_state, micfil_put_dc_remover_state),
+	SOC_SINGLE("HWVAD Input Gain", REG_MICFIL_VAD0_CTRL2, 8, 15, 0),
+	SOC_SINGLE("HWVAD Sound Gain", REG_MICFIL_VAD0_SCONFIG, 0, 15, 0),
+	SOC_SINGLE("HWVAD Noise Gain", REG_MICFIL_VAD0_NCONFIG, 0, 15, 0),
+	SOC_SINGLE_RANGE("HWVAD Detector Frame Time", REG_MICFIL_VAD0_CTRL2, 16, 0, 63, 0),
+	SOC_SINGLE("HWVAD Detector Initialization Time", REG_MICFIL_VAD0_CTRL1, 8, 31, 0),
+	SOC_SINGLE("HWVAD Noise Filter Adjustment", REG_MICFIL_VAD0_NCONFIG, 8, 31, 0),
+	SOC_SINGLE("HWVAD ZCD Threshold", REG_MICFIL_VAD0_ZCD, 16, 1023, 0),
+	SOC_SINGLE("HWVAD ZCD Adjustment", REG_MICFIL_VAD0_ZCD, 8, 15, 0),
+	SOC_SINGLE("HWVAD ZCD And Behavior Switch",
+		   REG_MICFIL_VAD0_ZCD, 4, 1, 0),
+	SOC_SINGLE_BOOL_EXT("VAD Detected", 0, hwvad_detected, NULL),
 };
 
 /* The SRES is a self-negated bit which provides the CPU with the
@@ -210,6 +381,167 @@  static int fsl_micfil_startup(struct snd_pcm_substream *substream,
 	return 0;
 }
 
+/* Enable/disable hwvad interrupts */
+static int fsl_micfil_configure_hwvad_interrupts(struct fsl_micfil *micfil, int enable)
+{
+	u32 vadie_reg = enable ? MICFIL_VAD0_CTRL1_IE : 0;
+	u32 vaderie_reg = enable ? MICFIL_VAD0_CTRL1_ERIE : 0;
+
+	/* Voice Activity Detector Error Interruption */
+	regmap_update_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			   MICFIL_VAD0_CTRL1_ERIE, vaderie_reg);
+
+	/* Voice Activity Detector Interruption */
+	regmap_update_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			   MICFIL_VAD0_CTRL1_IE, vadie_reg);
+
+	return 0;
+}
+
+/* Configuration done only in energy-based initialization mode */
+static int fsl_micfil_init_hwvad_energy_mode(struct fsl_micfil *micfil)
+{
+	/* Keep the VADFRENDIS bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL2,
+			  MICFIL_VAD0_CTRL2_FRENDIS);
+
+	/* Keep the VADPREFEN bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL2,
+			  MICFIL_VAD0_CTRL2_PREFEN);
+
+	/* Keep the VADSFILEN bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_SCONFIG,
+			  MICFIL_VAD0_SCONFIG_SFILEN);
+
+	/* Keep the VADSMAXEN bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_SCONFIG,
+			  MICFIL_VAD0_SCONFIG_SMAXEN);
+
+	/* Keep the VADNFILAUTO bitfield asserted. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			MICFIL_VAD0_NCONFIG_NFILAUT);
+
+	/* Keep the VADNMINEN bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			  MICFIL_VAD0_NCONFIG_NMINEN);
+
+	/* Keep the VADNDECEN bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			  MICFIL_VAD0_NCONFIG_NDECEN);
+
+	/* Keep the VADNOREN bitfield cleared. */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			  MICFIL_VAD0_NCONFIG_NOREN);
+
+	return 0;
+}
+
+/* Configuration done only in envelope-based initialization mode */
+static int fsl_micfil_init_hwvad_envelope_mode(struct fsl_micfil *micfil)
+{
+	/* Assert the VADFRENDIS bitfield */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL2,
+			MICFIL_VAD0_CTRL2_FRENDIS);
+
+	/* Assert the VADPREFEN bitfield. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL2,
+			MICFIL_VAD0_CTRL2_PREFEN);
+
+	/* Assert the VADSFILEN bitfield. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_SCONFIG,
+			MICFIL_VAD0_SCONFIG_SFILEN);
+
+	/* Assert the VADSMAXEN bitfield. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_SCONFIG,
+			MICFIL_VAD0_SCONFIG_SMAXEN);
+
+	/* Clear the VADNFILAUTO bitfield */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			  MICFIL_VAD0_NCONFIG_NFILAUT);
+
+	/* Assert the VADNMINEN bitfield. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			MICFIL_VAD0_NCONFIG_NMINEN);
+
+	/* Assert the VADNDECEN bitfield. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			MICFIL_VAD0_NCONFIG_NDECEN);
+
+	/* Assert VADNOREN bitfield. */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_NCONFIG,
+			MICFIL_VAD0_NCONFIG_NOREN);
+
+	return 0;
+}
+
+/*
+ * Hardware Voice Active Detection: The HWVAD takes data from the input
+ * of a selected PDM microphone to detect if there is any
+ * voice activity. When a voice activity is detected, an interrupt could
+ * be delivered to the system. Initialization in section 8.4:
+ * Can work in two modes:
+ *  -> Eneveope-based mode (section 8.4.1)
+ *  -> Energy-based mode (section 8.4.2)
+ *
+ * It is important to remark that the HWVAD detector could be enabled
+ * or reset only when the MICFIL isn't running i.e. when the BSY_FIL
+ * bit in STAT register is cleared
+ */
+static int fsl_micfil_hwvad_enable(struct fsl_micfil *micfil)
+{
+	int ret;
+
+	micfil->vad_detected = 0;
+
+	/* envelope-based specific initialization */
+	if (micfil->vad_init_mode == MICFIL_HWVAD_ENVELOPE_MODE)
+		ret = fsl_micfil_init_hwvad_envelope_mode(micfil);
+	else
+		ret = fsl_micfil_init_hwvad_energy_mode(micfil);
+	if (ret)
+		return ret;
+
+	/* Voice Activity Detector Internal Filters Initialization*/
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			MICFIL_VAD0_CTRL1_ST10);
+
+	/* Voice Activity Detector Internal Filter */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			  MICFIL_VAD0_CTRL1_ST10);
+
+	/* Enable Interrupts */
+	ret = fsl_micfil_configure_hwvad_interrupts(micfil, 1);
+	if (ret)
+		return ret;
+
+	/* Voice Activity Detector Reset */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			MICFIL_VAD0_CTRL1_RST);
+
+	/* Voice Activity Detector Enabled */
+	regmap_set_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			MICFIL_VAD0_CTRL1_EN);
+
+	return 0;
+}
+
+static int fsl_micfil_hwvad_disable(struct fsl_micfil *micfil)
+{
+	struct device *dev = &micfil->pdev->dev;
+	int ret = 0;
+
+	/* Disable HWVAD */
+	regmap_clear_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			  MICFIL_VAD0_CTRL1_EN);
+
+	/* Disable hwvad interrupts */
+	ret = fsl_micfil_configure_hwvad_interrupts(micfil, 0);
+	if (ret)
+		dev_err(dev, "Failed to disable interrupts\n");
+
+	return ret;
+}
+
 static int fsl_micfil_trigger(struct snd_pcm_substream *substream, int cmd,
 			      struct snd_soc_dai *dai)
 {
@@ -245,10 +577,16 @@  static int fsl_micfil_trigger(struct snd_pcm_substream *substream, int cmd,
 		if (ret)
 			return ret;
 
+		if (micfil->vad_enabled)
+			fsl_micfil_hwvad_enable(micfil);
+
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (micfil->vad_enabled)
+			fsl_micfil_hwvad_disable(micfil);
+
 		/* Disable the module */
 		ret = regmap_clear_bits(micfil->regmap, REG_MICFIL_CTRL1,
 					MICFIL_CTRL1_PDMIEN);
@@ -328,6 +666,16 @@  static int fsl_micfil_hw_params(struct snd_pcm_substream *substream,
 				 FIELD_PREP(MICFIL_CTRL2_CLKDIV, clk_div) |
 				 FIELD_PREP(MICFIL_CTRL2_CICOSR, 16 - osr));
 
+	/* Configure CIC OSR in VADCICOSR */
+	regmap_update_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			   MICFIL_VAD0_CTRL1_CICOSR,
+			   FIELD_PREP(MICFIL_VAD0_CTRL1_CICOSR, 16 - osr));
+
+	/* Configure source channel in VADCHSEL */
+	regmap_update_bits(micfil->regmap, REG_MICFIL_VAD0_CTRL1,
+			   MICFIL_VAD0_CTRL1_CHSEL,
+			   FIELD_PREP(MICFIL_VAD0_CTRL1_CHSEL, (channels - 1)));
+
 	micfil->dma_params_rx.peripheral_config = &micfil->sdmacfg;
 	micfil->dma_params_rx.peripheral_size = sizeof(micfil->sdmacfg);
 	micfil->sdmacfg.n_fifos_src = channels;
@@ -351,6 +699,7 @@  static int fsl_micfil_dai_probe(struct snd_soc_dai *cpu_dai)
 	int ret, i;
 
 	micfil->quality = QUALITY_VLOW0;
+	micfil->card = cpu_dai->component->card;
 
 	/* set default gain to 2 */
 	regmap_write(micfil->regmap, REG_MICFIL_OUT_CTRL, 0x22222222);
@@ -585,6 +934,71 @@  static irqreturn_t micfil_err_isr(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t voice_detected_fn(int irq, void *devid)
+{
+	struct fsl_micfil *micfil = (struct fsl_micfil *)devid;
+	struct snd_kcontrol *kctl;
+
+	if (!micfil->card)
+		return IRQ_HANDLED;
+
+	kctl = snd_soc_card_get_kcontrol(micfil->card, "VAD Detected");
+	if (!kctl)
+		return IRQ_HANDLED;
+
+	if (micfil->vad_detected)
+		snd_ctl_notify(micfil->card->snd_card,
+			       SNDRV_CTL_EVENT_MASK_VALUE,
+			       &kctl->id);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t hwvad_isr(int irq, void *devid)
+{
+	struct fsl_micfil *micfil = (struct fsl_micfil *)devid;
+	struct device *dev = &micfil->pdev->dev;
+	u32 vad0_reg;
+	int ret;
+
+	regmap_read(micfil->regmap, REG_MICFIL_VAD0_STAT, &vad0_reg);
+
+	/*
+	 * The only difference between MICFIL_VAD0_STAT_EF and
+	 * MICFIL_VAD0_STAT_IF is that the former requires Write
+	 * 1 to Clear. Since both flags are set, it is enough
+	 * to only read one of them
+	 */
+	if (vad0_reg & MICFIL_VAD0_STAT_IF) {
+		/* Write 1 to clear */
+		regmap_write_bits(micfil->regmap, REG_MICFIL_VAD0_STAT,
+				  MICFIL_VAD0_STAT_IF,
+				  MICFIL_VAD0_STAT_IF);
+
+		micfil->vad_detected = 1;
+	}
+
+	ret = fsl_micfil_hwvad_disable(micfil);
+	if (ret)
+		dev_err(dev, "Failed to disable hwvad\n");
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t hwvad_err_isr(int irq, void *devid)
+{
+	struct fsl_micfil *micfil = (struct fsl_micfil *)devid;
+	struct device *dev = &micfil->pdev->dev;
+	u32 vad0_reg;
+
+	regmap_read(micfil->regmap, REG_MICFIL_VAD0_STAT, &vad0_reg);
+
+	if (vad0_reg & MICFIL_VAD0_STAT_INSATF)
+		dev_dbg(dev, "voice activity input overflow/underflow detected\n");
+
+	return IRQ_HANDLED;
+}
+
 static int fsl_micfil_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -677,6 +1091,26 @@  static int fsl_micfil_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	/* Digital Microphone interface voice activity detector event */
+	ret = devm_request_threaded_irq(&pdev->dev, micfil->irq[2],
+					hwvad_isr, voice_detected_fn,
+					IRQF_SHARED, micfil->name, micfil);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to claim hwvad event irq %u\n",
+			micfil->irq[0]);
+		return ret;
+	}
+
+	/* Digital Microphone interface voice activity detector error */
+	ret = devm_request_irq(&pdev->dev, micfil->irq[3],
+			       hwvad_err_isr, IRQF_SHARED,
+			       micfil->name, micfil);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to claim hwvad error irq %u\n",
+			micfil->irq[1]);
+		return ret;
+	}
+
 	micfil->dma_params_rx.chan_name = "rx";
 	micfil->dma_params_rx.addr = res->start + REG_MICFIL_DATACH0;
 	micfil->dma_params_rx.maxburst = MICFIL_DMA_MAXBURST_RX;
diff --git a/sound/soc/fsl/fsl_micfil.h b/sound/soc/fsl/fsl_micfil.h
index d60285dd07bc..9237a1c4cb8f 100644
--- a/sound/soc/fsl/fsl_micfil.h
+++ b/sound/soc/fsl/fsl_micfil.h
@@ -136,10 +136,14 @@ 
 #define FIFO_PTRWID			3
 #define FIFO_LEN			BIT(FIFO_PTRWID)
 
-#define MICFIL_IRQ_LINES		2
+#define MICFIL_IRQ_LINES		4
 #define MICFIL_MAX_RETRY		25
 #define MICFIL_SLEEP_MIN		90000 /* in us */
 #define MICFIL_SLEEP_MAX		100000 /* in us */
 #define MICFIL_DMA_MAXBURST_RX		6
 
+/* HWVAD Constants */
+#define MICFIL_HWVAD_ENVELOPE_MODE	0
+#define MICFIL_HWVAD_ENERGY_MODE	1
+
 #endif /* _FSL_MICFIL_H */