ASoC: msm: add support for MIC-GND swap switch

If the board has a switch to swap the GND and MIC connections for
headset jack, enable the support to flip the switch through gpio
to swap GND and MIC.

CRs-Fixed: 642944
Change-Id: Ifca2c10ef7789925f1c720a79088a376b4a0adcb
Signed-off-by: Simmi Pateriya <simmip@codeaurora.org>

Documentation/devicetree/bindings/sound/qcom-audio-dev.txt

@@ -504,9 +504,17 @@ normally open.
 switch type on target typically the switch type will be normally open or
 normally close, value for this property 0 for normally close and 1 for
 normally open.
-- pinctrl-names : Pincntrl entries to configure the PDM gpio lines accordingly
-- pinctrl-0 : This exoplains the active state of the PDM gpio lines
-- pinctrl-1 : This exoplains the suspend state of the PDM gpio lines
+- pinctrl-names : Pincntrl entries to configure the PDM gpio lines and
+		  cross connection switch gpio accordingly
+- pinctrl-0 : This explains the active state of the PDM gpio lines
+- pinctrl-1 : This explains the suspend state of the PDM gpio lines
+- pinctrl-2 : This explains the active state of the cross connection
+	      gpio lines
+- pinctrl-3 : This explains the suspend state of the cross connection
+              gpio lines
+
+Optional Properties:
+- qcom,us-euro-gpios : GPIO on which gnd/mic swap signal is coming.
 
 Example:
 
@@ -517,6 +525,7 @@ Example:
 		qcom,msm-codec-type = "internal";
 		qcom,msm-mbhc-hphl-swh = <0>;
 		qcom,msm-mbhc-gnd-swh = <0>;
+		qcom,cdc-us-euro-gpios = <&msmgpio 120 0>;
 		qcom,audio-routing =
 			"RX_BIAS", "MCLK",
 			"INT_LDO_H", "MCLK",
@@ -527,9 +536,13 @@ Example:
 			"AMIC2", "MIC BIAS Internal2",
 			"AMIC3", "MIC BIAS External";
 		pinctrl-names = "cdc_pdm_lines_act",
-				"cdc_pdm_lines_sus";
+				"cdc_pdm_lines_sus",
+				"cross_conn_det_act",
+				"cross_conn_det_sus";
 		pinctrl-0 = <&cdc_pdm_lines_act>;
 		pinctrl-1 = <&cdc_pdm_lines_sus>;
+		pinctrl-2 = <&cross_conn_det_act>;
+		pinctrl-3 = <&cross_conn_det_sus>;
 	};
 
 * MSM8974 ASoC Machine driver

sound/soc/codecs/msm8x16-wcd.h

@@ -119,6 +119,7 @@ struct msm8x16_wcd_regulator {
 
 struct msm8916_asoc_mach_data {
 	int codec_type;
+	int us_euro_gpio;
 	atomic_t mclk_rsc_ref;
 	atomic_t dis_work_mclk;
 	struct mutex cdc_mclk_mutex;

sound/soc/codecs/wcd-mbhc-v2.c

@@ -441,6 +441,7 @@ static void wcd_mbhc_detect_plug_type(struct wcd_mbhc *mbhc)
 		if (!result1 && !(swap_res & 0x04)) {
 			plug_type = PLUG_TYPE_GND_MIC_SWAP;
 			pr_debug("%s: Cross connection identified", __func__);
+			goto eu_us_switch;
 		} else {
 			pr_debug("%s: No Cross connection found", __func__);
 		}
@@ -468,6 +469,25 @@ static void wcd_mbhc_detect_plug_type(struct wcd_mbhc *mbhc)
 			goto exit;
 		}
 	}
+
+eu_us_switch:
+	if (plug_type == PLUG_TYPE_GND_MIC_SWAP) {
+		pr_debug("%s: cross connection found\n", __func__);
+		if (mbhc->mbhc_cfg->swap_gnd_mic) {
+			pr_debug("%s: US_EU gpio present, flip switch\n",
+				__func__);
+			if (mbhc->mbhc_cfg->swap_gnd_mic(codec))
+				plug_type = PLUG_TYPE_HEADSET;
+		}
+		/* Disable micbias and schmitt trigger */
+		snd_soc_update_bits(codec,
+			MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_2,
+			0x6, 0x0);
+		snd_soc_update_bits(codec,
+			MSM8X16_WCD_A_ANALOG_MICB_2_EN,
+			0x80, 0x00);
+	}
+
 	pr_debug("%s: Valid plug found, plug type is %d\n",
 			 __func__, plug_type);
 	wcd_mbhc_find_plug_and_report(mbhc, plug_type);

sound/soc/codecs/wcd-mbhc-v2.h

@@ -31,6 +31,7 @@ struct wcd_mbhc_config {
 	void *calibration;
 	bool detect_extn_cable;
 	bool mono_stero_detection;
+	bool (*swap_gnd_mic) (struct snd_soc_codec *codec);
 };
 
 struct wcd_mbhc_intr {

sound/soc/msm/msm8x16.c

@@ -56,6 +56,7 @@ static struct wcd_mbhc_config mbhc_cfg = {
 	.calibration = NULL,
 	.detect_extn_cable = true,
 	.mono_stero_detection = false,
+	.swap_gnd_mic = NULL,
 };
 
 static struct afe_clk_cfg mi2s_rx_clk = {
@@ -82,6 +83,8 @@ struct cdc_pdm_pinctrl_info {
 	struct pinctrl *pinctrl;
 	struct pinctrl_state *cdc_pdm_sus;
 	struct pinctrl_state *cdc_pdm_act;
+	struct pinctrl_state *cross_conn_det_sus;
+	struct pinctrl_state *cross_conn_det_act;
 };
 
 static struct cdc_pdm_pinctrl_info pinctrl_info;
@@ -970,7 +973,29 @@ static int cdc_pdm_get_pinctrl(struct platform_device *pdev)
 		pr_err("%s: Failed to disable the TLMM pins\n", __func__);
 		return -EIO;
 	}
+	/* get pinctrl handle for cross det pin*/
+	pinctrl_info.cross_conn_det_sus = pinctrl_lookup_state(pinctrl,
+							"cross_conn_det_sus");
+	if (IS_ERR(pinctrl_info.cross_conn_det_sus)) {
+		pr_err("%s: Unable to get pinctrl disable state handle\n",
+								__func__);
+		return -EINVAL;
+	}
 
+	pinctrl_info.cross_conn_det_act = pinctrl_lookup_state(pinctrl,
+							"cross_conn_det_act");
+	if (IS_ERR(pinctrl_info.cross_conn_det_act)) {
+		pr_err("%s: Unable to get pinctrl active state handle\n",
+								 __func__);
+		return -EINVAL;
+	}
+	/* Reset cross conn det pins to default state*/
+	ret = pinctrl_select_state(pinctrl_info.pinctrl,
+					pinctrl_info.cross_conn_det_sus);
+	if (ret != 0) {
+		pr_err("%s: Failed to disable cross conn det pins\n", __func__);
+		return -EIO;
+	}
 	return 0;
 }
 
@@ -998,6 +1023,50 @@ void enable_mclk(struct work_struct *work)
 	mutex_unlock(&pdata->cdc_mclk_mutex);
 }
 
+static bool msm8x16_swap_gnd_mic(struct snd_soc_codec *codec)
+{
+	struct snd_soc_card *card = codec->card;
+	struct msm8916_asoc_mach_data *pdata = snd_soc_card_get_drvdata(card);
+	int value, ret;
+
+	if (!gpio_is_valid(pdata->us_euro_gpio)) {
+		pr_debug("%s: Invalid gpio: %d", __func__, pdata->us_euro_gpio);
+		return false;
+	}
+	ret = pinctrl_select_state(pinctrl_info.pinctrl,
+				pinctrl_info.cross_conn_det_act);
+	if (ret < 0) {
+		pr_err("failed to configure the gpio\n");
+		return ret;
+	}
+	value = gpio_get_value_cansleep(pdata->us_euro_gpio);
+	gpio_direction_output(pdata->us_euro_gpio, !value);
+	pr_debug("%s: swap select switch %d to %d\n", __func__, value, !value);
+	ret = pinctrl_select_state(pinctrl_info.pinctrl,
+				pinctrl_info.cross_conn_det_sus);
+	if (ret < 0) {
+		pr_err("failed to configure the gpio\n");
+		return ret;
+	}
+
+	return true;
+}
+
+static void msm8x16_setup_hs_jack(struct platform_device *pdev,
+			struct msm8916_asoc_mach_data *pdata)
+{
+	pdata->us_euro_gpio = of_get_named_gpio(pdev->dev.of_node,
+					"qcom,cdc-us-euro-gpios", 0);
+	if (pdata->us_euro_gpio < 0) {
+		dev_dbg(&pdev->dev,
+			"property %s in node %s not found %d\n",
+			"qcom,cdc-us-euro-gpios", pdev->dev.of_node->full_name,
+			pdata->us_euro_gpio);
+	} else {
+		mbhc_cfg.swap_gnd_mic = msm8x16_swap_gnd_mic;
+	}
+}
+
 static int msm8x16_asoc_machine_probe(struct platform_device *pdev)
 {
 	struct snd_soc_card *card;
@@ -1065,6 +1134,8 @@ static int msm8x16_asoc_machine_probe(struct platform_device *pdev)
 	}
 	card = &bear_cards[pdev->id];
 
+	msm8x16_setup_hs_jack(pdev, pdata);
+
 	card->dev = &pdev->dev;
 	platform_set_drvdata(pdev, card);
 	snd_soc_card_set_drvdata(card, pdata);