ASoC: wcd-mbhc: add support to read new headset detection parameters

To config different headset detection parameters for different hardware, add
two new headset detection parameters in device tree and read it in mbhc driver.

Change-Id: I10457b7d5eae54eba8a4cd273885a63ebad3ccb3
Signed-off-by: Meng Wang <mwang@codeaurora.org>

asoc/codecs/wcd-mbhc-adc.c

@@ -370,11 +370,18 @@ static bool wcd_mbhc_adc_check_for_spl_headset(struct wcd_mbhc *mbhc,
 	 * btn press/relesae for HEADSET type during correct work.
 	 */
 	output_mv = wcd_measure_adc_once(mbhc, MUX_CTL_IN2P);
-	adc_threshold = ((WCD_MBHC_ADC_HS_THRESHOLD_MV *
+	if (mbhc->hs_thr)
+		adc_threshold = mbhc->hs_thr;
+	else
+		adc_threshold = ((WCD_MBHC_ADC_HS_THRESHOLD_MV *
 			  wcd_mbhc_get_micbias(mbhc))/WCD_MBHC_ADC_MICBIAS_MV);
-	adc_hph_threshold = ((WCD_MBHC_ADC_HPH_THRESHOLD_MV *
-			      wcd_mbhc_get_micbias(mbhc))/
-			      WCD_MBHC_ADC_MICBIAS_MV);
+
+	if (mbhc->hph_thr)
+		adc_hph_threshold = mbhc->hph_thr;
+	else
+		adc_hph_threshold = ((WCD_MBHC_ADC_HPH_THRESHOLD_MV *
+				wcd_mbhc_get_micbias(mbhc))/
+				WCD_MBHC_ADC_MICBIAS_MV);
 
 	if (output_mv > adc_threshold || output_mv < adc_hph_threshold) {
 		spl_hs = false;
@@ -426,8 +433,10 @@ static bool wcd_is_special_headset(struct wcd_mbhc *mbhc)
 			return false;
 		}
 	}
-
-	adc_threshold = ((WCD_MBHC_ADC_HS_THRESHOLD_MV *
+	if (mbhc->hs_thr)
+		adc_threshold = mbhc->hs_thr;
+	else
+		adc_threshold = ((WCD_MBHC_ADC_HS_THRESHOLD_MV *
 			  wcd_mbhc_get_micbias(mbhc)) /
 			  WCD_MBHC_ADC_MICBIAS_MV);
 
@@ -556,14 +565,25 @@ static void wcd_micbias_disable(struct wcd_mbhc *mbhc)
 	}
 }
 
-static int wcd_mbhc_get_plug_from_adc(int adc_result)
+static int wcd_mbhc_get_plug_from_adc(struct wcd_mbhc *mbhc, int adc_result)
 
 {
 	enum wcd_mbhc_plug_type plug_type = MBHC_PLUG_TYPE_INVALID;
+	u32 hph_thr = 0, hs_thr = 0;
 
-	if (adc_result < WCD_MBHC_ADC_HPH_THRESHOLD_MV)
+	if (mbhc->hs_thr)
+		hs_thr = mbhc->hs_thr;
+	else
+		hs_thr = WCD_MBHC_ADC_HS_THRESHOLD_MV;
+
+	if (mbhc->hph_thr)
+		hph_thr = mbhc->hph_thr;
+	else
+		hph_thr = WCD_MBHC_ADC_HPH_THRESHOLD_MV;
+
+	if (adc_result < hph_thr)
 		plug_type = MBHC_PLUG_TYPE_HEADPHONE;
-	else if (adc_result > WCD_MBHC_ADC_HS_THRESHOLD_MV)
+	else if (adc_result > hs_thr)
 		plug_type = MBHC_PLUG_TYPE_HIGH_HPH;
 	else
 		plug_type = MBHC_PLUG_TYPE_HEADSET;
@@ -612,7 +632,7 @@ static void wcd_correct_swch_plug(struct work_struct *work)
 	}
 	/* Find plug type */
 	output_mv = wcd_measure_adc_continuous(mbhc);
-	plug_type = wcd_mbhc_get_plug_from_adc(output_mv);
+	plug_type = wcd_mbhc_get_plug_from_adc(mbhc, output_mv);
 
 	/*
 	 * Report plug type if it is either headset or headphone
@@ -667,7 +687,7 @@ correct_plug_type:
 		 * instead of hogging system by contineous polling, wait for
 		 * sometime and re-check stop request again.
 		 */
-		plug_type = wcd_mbhc_get_plug_from_adc(output_mv);
+		plug_type = wcd_mbhc_get_plug_from_adc(mbhc, output_mv);
 
 		if ((output_mv > WCD_MBHC_ADC_HS_THRESHOLD_MV) &&
 		    (spl_hs_count < WCD_MBHC_SPL_HS_CNT)) {
@@ -713,7 +733,7 @@ correct_plug_type:
 				no_gnd_mic_swap_cnt++;
 				pt_gnd_mic_swap_cnt = 0;
 				plug_type = wcd_mbhc_get_plug_from_adc(
-						output_mv);
+						mbhc, output_mv);
 				if ((no_gnd_mic_swap_cnt <
 				    GND_MIC_SWAP_THRESHOLD) &&
 				    (spl_hs_count != WCD_MBHC_SPL_HS_CNT)) {
@@ -747,7 +767,7 @@ correct_plug_type:
 				 plug_type);
 			if (plug_type != MBHC_PLUG_TYPE_GND_MIC_SWAP) {
 				plug_type = wcd_mbhc_get_plug_from_adc(
-						output_mv);
+						mbhc, output_mv);
 				if (!spl_hs_reported &&
 				    spl_hs_count == WCD_MBHC_SPL_HS_CNT) {
 					spl_hs_reported = true;