ASoC: cs42l42: Implement Manual Type detection as fallback

Some headsets are not detected correctly by Automatic Type Detection
on cs42l42. Instead, Manual Type Detection can be used to give a
more accurate value.
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210916102750.9212-2-vitalyr@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l42.c

@@ -1046,37 +1046,117 @@ static struct snd_soc_dai_driver cs42l42_dai = {
 		.ops = &cs42l42_ops,
 };
 
-static void cs42l42_process_hs_type_detect(struct cs42l42_private *cs42l42)
+static void cs42l42_manual_hs_type_detect(struct cs42l42_private *cs42l42)
 {
 	unsigned int hs_det_status;
-	unsigned int int_status;
+	unsigned int hs_det_comp;
+	unsigned int hs_det_sw;
 
-	/* Mask the auto detect interrupt */
+	/* Set hs detect to manual, active mode */
 	regmap_update_bits(cs42l42->regmap,
-		CS42L42_CODEC_INT_MASK,
-		CS42L42_PDN_DONE_MASK |
-		CS42L42_HSDET_AUTO_DONE_MASK,
-		(1 << CS42L42_PDN_DONE_SHIFT) |
-		(1 << CS42L42_HSDET_AUTO_DONE_SHIFT));
+		CS42L42_HSDET_CTL2,
+		CS42L42_HSDET_CTRL_MASK |
+		CS42L42_HSDET_SET_MASK |
+		CS42L42_HSBIAS_REF_MASK |
+		CS42L42_HSDET_AUTO_TIME_MASK,
+		(1 << CS42L42_HSDET_CTRL_SHIFT) |
+		(0 << CS42L42_HSDET_SET_SHIFT) |
+		(0 << CS42L42_HSBIAS_REF_SHIFT) |
+		(0 << CS42L42_HSDET_AUTO_TIME_SHIFT));
+
+	/* Open the SW_HSB_HS3 switch and close SW_HSB_HS4 for a Type 1 headset. */
+	regmap_write(cs42l42->regmap, CS42L42_HS_SWITCH_CTL, CS42L42_HSDET_SW_COMP1);
+
+	regmap_read(cs42l42->regmap, CS42L42_HS_DET_STATUS, &hs_det_status);
+
+	hs_det_comp = (hs_det_status & CS42L42_HSDET_COMP1_OUT_MASK) >>
+			CS42L42_HSDET_COMP1_OUT_SHIFT;
+
+	/* Close the SW_HSB_HS3 switch for a Type 2 headset. */
+	regmap_write(cs42l42->regmap, CS42L42_HS_SWITCH_CTL, CS42L42_HSDET_SW_COMP2);
+
+	regmap_read(cs42l42->regmap, CS42L42_HS_DET_STATUS, &hs_det_status);
+
+	hs_det_comp |= ((hs_det_status & CS42L42_HSDET_COMP2_OUT_MASK) >>
+			CS42L42_HSDET_COMP2_OUT_SHIFT) << 1;
+
+	switch (hs_det_comp) {
+	case CS42L42_HSDET_COMP_TYPE1:
+		cs42l42->hs_type = CS42L42_PLUG_CTIA;
+		hs_det_sw = CS42L42_HSDET_SW_TYPE1;
+		break;
+	case CS42L42_HSDET_COMP_TYPE2:
+		cs42l42->hs_type = CS42L42_PLUG_OMTP;
+		hs_det_sw = CS42L42_HSDET_SW_TYPE2;
+		break;
+	case CS42L42_HSDET_COMP_TYPE3:
+		cs42l42->hs_type = CS42L42_PLUG_HEADPHONE;
+		hs_det_sw = CS42L42_HSDET_SW_TYPE3;
+		break;
+	default:
+		cs42l42->hs_type = CS42L42_PLUG_INVALID;
+		hs_det_sw = CS42L42_HSDET_SW_TYPE4;
+		break;
+	}
 
-	/* Set hs detect to automatic, disabled mode */
+	/* Set Switches */
+	regmap_write(cs42l42->regmap, CS42L42_HS_SWITCH_CTL, hs_det_sw);
+
+	/* Set HSDET mode to Manual—Disabled */
 	regmap_update_bits(cs42l42->regmap,
 		CS42L42_HSDET_CTL2,
 		CS42L42_HSDET_CTRL_MASK |
 		CS42L42_HSDET_SET_MASK |
 		CS42L42_HSBIAS_REF_MASK |
 		CS42L42_HSDET_AUTO_TIME_MASK,
-		(2 << CS42L42_HSDET_CTRL_SHIFT) |
-		(2 << CS42L42_HSDET_SET_SHIFT) |
+		(0 << CS42L42_HSDET_CTRL_SHIFT) |
+		(0 << CS42L42_HSDET_SET_SHIFT) |
 		(0 << CS42L42_HSBIAS_REF_SHIFT) |
-		(3 << CS42L42_HSDET_AUTO_TIME_SHIFT));
+		(0 << CS42L42_HSDET_AUTO_TIME_SHIFT));
+}
+
+static void cs42l42_process_hs_type_detect(struct cs42l42_private *cs42l42)
+{
+	unsigned int hs_det_status;
+	unsigned int int_status;
 
 	/* Read and save the hs detection result */
 	regmap_read(cs42l42->regmap, CS42L42_HS_DET_STATUS, &hs_det_status);
 
+	/* Mask the auto detect interrupt */
+	regmap_update_bits(cs42l42->regmap,
+		CS42L42_CODEC_INT_MASK,
+		CS42L42_PDN_DONE_MASK |
+		CS42L42_HSDET_AUTO_DONE_MASK,
+		(1 << CS42L42_PDN_DONE_SHIFT) |
+		(1 << CS42L42_HSDET_AUTO_DONE_SHIFT));
+
+
 	cs42l42->hs_type = (hs_det_status & CS42L42_HSDET_TYPE_MASK) >>
 				CS42L42_HSDET_TYPE_SHIFT;
 
+	/* Run Manual detection if auto detect has not found a headset.
+	 * We Re-Run with Manual Detection if the original detection was invalid or headphones,
+	 * to ensure that a headset mic is detected in all cases.
+	 */
+	if (cs42l42->hs_type == CS42L42_PLUG_INVALID ||
+		cs42l42->hs_type == CS42L42_PLUG_HEADPHONE) {
+		dev_dbg(cs42l42->component->dev, "Running Manual Detection Fallback\n");
+		cs42l42_manual_hs_type_detect(cs42l42);
+	} else {
+		/* Set hs detect to automatic, disabled mode */
+		regmap_update_bits(cs42l42->regmap,
+			CS42L42_HSDET_CTL2,
+			CS42L42_HSDET_CTRL_MASK |
+			CS42L42_HSDET_SET_MASK |
+			CS42L42_HSBIAS_REF_MASK |
+			CS42L42_HSDET_AUTO_TIME_MASK,
+			(2 << CS42L42_HSDET_CTRL_SHIFT) |
+			(2 << CS42L42_HSDET_SET_SHIFT) |
+			(0 << CS42L42_HSBIAS_REF_SHIFT) |
+			(3 << CS42L42_HSDET_AUTO_TIME_SHIFT));
+	}
+
 	/* Set up button detection */
 	if ((cs42l42->hs_type == CS42L42_PLUG_CTIA) ||
 	      (cs42l42->hs_type == CS42L42_PLUG_OMTP)) {

sound/soc/codecs/cs42l42.h

@@ -228,6 +228,60 @@
 #define CS42L42_PLUG_HEADPHONE		2
 #define CS42L42_PLUG_INVALID		3
 
+#define CS42L42_HSDET_SW_COMP1		((0 << CS42L42_SW_GNDHS_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_GNDHS_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_FILT_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_REF_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS3_SHIFT))
+#define CS42L42_HSDET_SW_COMP2		((1 << CS42L42_SW_GNDHS_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_GNDHS_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_FILT_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_REF_HS3_SHIFT))
+#define CS42L42_HSDET_SW_TYPE1		((0 << CS42L42_SW_GNDHS_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_GNDHS_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_FILT_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_REF_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS3_SHIFT))
+#define CS42L42_HSDET_SW_TYPE2		((1 << CS42L42_SW_GNDHS_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_GNDHS_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_FILT_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_REF_HS3_SHIFT))
+#define CS42L42_HSDET_SW_TYPE3		((1 << CS42L42_SW_GNDHS_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_GNDHS_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS3_SHIFT))
+#define CS42L42_HSDET_SW_TYPE4		((0 << CS42L42_SW_GNDHS_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_GNDHS_HS3_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_HS4_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_HSB_FILT_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_HSB_FILT_HS3_SHIFT) | \
+					 (0 << CS42L42_SW_REF_HS4_SHIFT) | \
+					 (1 << CS42L42_SW_REF_HS3_SHIFT))
+
+#define CS42L42_HSDET_COMP_TYPE1	1
+#define CS42L42_HSDET_COMP_TYPE2	2
+#define CS42L42_HSDET_COMP_TYPE3	0
+#define CS42L42_HSDET_COMP_TYPE4	3
+
 #define CS42L42_HS_CLAMP_DISABLE	(CS42L42_PAGE_11 + 0x29)
 #define CS42L42_HS_CLAMP_DISABLE_SHIFT	0
 #define CS42L42_HS_CLAMP_DISABLE_MASK	(1 << CS42L42_HS_CLAMP_DISABLE_SHIFT)