ASoC: codecs: wcd: add common helper for wcd codecs

All the Qualcomm WCD codecs have most of its code duplicated across all
these 3/4 drivers. This is an attempt to remove those duplicate
parts by adding a common helper library for these codecs.

To start with move all the micbias parsing and voltage settings these
are identical in WCD934x, WCD937x, WCD938x and WCD939x codec driver.

Signed-off-by: Srinivas Kandagatla <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/Kconfig

···
 config SND_SOC_WCD_CLASSH
 	tristate
 
+config SND_SOC_WCD_COMMON
+	tristate
+
 config SND_SOC_WCD9335
 	tristate "WCD9335 Codec"
 	depends on SLIMBUS
···
 	select REGMAP_IRQ
 	select REGMAP_SLIMBUS
 	select SND_SOC_WCD_CLASSH
+	select SND_SOC_WCD_COMMON
 	select SND_SOC_WCD_MBHC
 	depends on MFD_WCD934X || COMPILE_TEST
 	help
···
 	tristate
 	depends on SOUNDWIRE || !SOUNDWIRE
 	select SND_SOC_WCD_CLASSH
+	select SND_SOC_WCD_COMMON
 
 config SND_SOC_WCD937X_SDW
 	tristate "WCD9370/WCD9375 Codec - SDW"
···
 	tristate
 	depends on SOUNDWIRE || !SOUNDWIRE
 	select SND_SOC_WCD_CLASSH
+	select SND_SOC_WCD_COMMON
 	select MULTIPLEXER
 
 config SND_SOC_WCD938X_SDW
···
 	depends on SOUNDWIRE || !SOUNDWIRE
 	depends on TYPEC || !TYPEC
 	select SND_SOC_WCD_CLASSH
+	select SND_SOC_WCD_COMMON
 
 config SND_SOC_WCD939X_SDW
 	tristate "WCD9390/WCD9395 Codec - SDW"

sound/soc/codecs/Makefile

···
 snd-soc-uda1342-y := uda1342.o
 snd-soc-uda1380-y := uda1380.o
 snd-soc-wcd-classh-y := wcd-clsh-v2.o
+snd-soc-wcd-common-y := wcd-common.o
 snd-soc-wcd-mbhc-y := wcd-mbhc-v2.o
 snd-soc-wcd9335-y := wcd9335.o
 snd-soc-wcd934x-y := wcd934x.o
···
 obj-$(CONFIG_SND_SOC_UDA1342)	+= snd-soc-uda1342.o
 obj-$(CONFIG_SND_SOC_UDA1380)	+= snd-soc-uda1380.o
 obj-$(CONFIG_SND_SOC_WCD_CLASSH)	+= snd-soc-wcd-classh.o
+obj-$(CONFIG_SND_SOC_WCD_COMMON)	+= snd-soc-wcd-common.o
 obj-$(CONFIG_SND_SOC_WCD_MBHC)	+= snd-soc-wcd-mbhc.o
 obj-$(CONFIG_SND_SOC_WCD9335)	+= snd-soc-wcd9335.o
 obj-$(CONFIG_SND_SOC_WCD934X)	+= snd-soc-wcd934x.o

sound/soc/codecs/wcd-common.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2025, Qualcomm Technologies, Inc. and/or its subsidiaries.
+
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/printk.h>
+
+#include "wcd-common.h"
+
+#define WCD_MIN_MICBIAS_MV	1000
+#define WCD_DEF_MICBIAS_MV	1800
+#define WCD_MAX_MICBIAS_MV	2850
+
+int wcd_get_micb_vout_ctl_val(struct device *dev, u32 micb_mv)
+{
+	/* min micbias voltage is 1V and maximum is 2.85V */
+	if (micb_mv < WCD_MIN_MICBIAS_MV || micb_mv > WCD_MAX_MICBIAS_MV) {
+		dev_err(dev, "Unsupported micbias voltage (%u mV)\n", micb_mv);
+		return -EINVAL;
+	}
+
+	return (micb_mv - WCD_MIN_MICBIAS_MV) / 50;
+}
+EXPORT_SYMBOL_GPL(wcd_get_micb_vout_ctl_val);
+
+static int wcd_get_micbias_val(struct device *dev, int micb_num, u32 *micb_mv)
+{
+	char micbias[64];
+	int mv;
+
+	sprintf(micbias, "qcom,micbias%d-microvolt", micb_num);
+
+	if (of_property_read_u32(dev->of_node, micbias, &mv)) {
+		dev_err(dev, "%s value not found, using default\n", micbias);
+		mv = WCD_DEF_MICBIAS_MV;
+	} else {
+		/* convert it to milli volts */
+		mv = mv/1000;
+	}
+	if (micb_mv)
+		*micb_mv = mv;
+
+	mv = wcd_get_micb_vout_ctl_val(dev, mv);
+	if (mv < 0) {
+		dev_err(dev, "Unsupported %s voltage (%d mV), falling back to default (%d mV)\n",
+				micbias, mv, WCD_DEF_MICBIAS_MV);
+		return wcd_get_micb_vout_ctl_val(dev, WCD_DEF_MICBIAS_MV);
+	}
+
+	return mv;
+}
+
+int wcd_dt_parse_micbias_info(struct wcd_common *common)
+{
+	int i;
+
+	for (i = 0; i < common->max_bias; i++) {
+		common->micb_vout[i] = wcd_get_micbias_val(common->dev, i + 1, &common->micb_mv[i]);
+		if (common->micb_vout[i] < 0)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wcd_dt_parse_micbias_info);
+MODULE_DESCRIPTION("Common Qualcomm WCD Codec helpers driver");
+MODULE_LICENSE("GPL");

sound/soc/codecs/wcd-common.h

···
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2025, Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+#ifndef __WCD_COMMON_H__
+#define __WCD_COMMON_H__
+
+struct device;
+struct sdw_slave;
+struct sdw_bus_params;
+struct irq_domain;
+enum sdw_slave_status;
+
+#define WCD_MAX_MICBIAS		4
+
+struct wcd_common {
+	struct device *dev;
+	int max_bias;
+	u32 micb_mv[WCD_MAX_MICBIAS];
+	u32 micb_vout[WCD_MAX_MICBIAS];
+};
+
+int wcd_get_micb_vout_ctl_val(struct device *dev, u32 micb_mv);
+int wcd_dt_parse_micbias_info(struct wcd_common *common);
+
+#endif /* __WCD_COMMON_H__  */

sound/soc/codecs/wcd934x.c

···
 #include <sound/soc-dapm.h>
 #include <sound/tlv.h>
 #include "wcd-clsh-v2.h"
+#include "wcd-common.h"
 #include "wcd-mbhc-v2.h"
 
 #include <dt-bindings/sound/qcom,wcd934x.h>
···
 #define WCD934X_DEC_PWR_LVL_HP		0x04
 #define WCD934X_DEC_PWR_LVL_DF		0x00
 #define WCD934X_DEC_PWR_LVL_HYBRID WCD934X_DEC_PWR_LVL_DF
-
-#define WCD934X_DEF_MICBIAS_MV	1800
-#define WCD934X_MAX_MICBIAS_MV	2850
 
 #define WCD_IIR_FILTER_SIZE	(sizeof(u32) * BAND_MAX)
 
···
 	struct slim_device *sdev;
 	struct slim_device *sidev;
 	struct wcd_clsh_ctrl *clsh_ctrl;
+	struct wcd_common common;
 	struct snd_soc_component *component;
 	struct wcd934x_slim_ch rx_chs[WCD934X_RX_MAX];
 	struct wcd934x_slim_ch tx_chs[WCD934X_TX_MAX];
···
 	struct mutex micb_lock;
 	u32 micb_ref[WCD934X_MAX_MICBIAS];
 	u32 pullup_ref[WCD934X_MAX_MICBIAS];
-	u32 micb2_mv;
 };
 
 #define to_wcd934x_codec(_hw) container_of(_hw, struct wcd934x_codec, hw)
···
 	return NULL;
 }
 
-static int wcd934x_get_micbias_val(struct device *dev, const char *micbias,
-				   u32 *micb_mv)
-{
-	int mv;
-
-	if (of_property_read_u32(dev->parent->of_node, micbias, &mv)) {
-		dev_err(dev, "%s value not found, using default\n", micbias);
-		mv = WCD934X_DEF_MICBIAS_MV;
-	} else {
-		/* convert it to milli volts */
-		mv = mv/1000;
-	}
-
-	if (mv < 1000 || mv > 2850) {
-		dev_err(dev, "%s value not in valid range, using default\n",
-			micbias);
-		mv = WCD934X_DEF_MICBIAS_MV;
-	}
-
-	if (micb_mv)
-		*micb_mv = mv;
-
-	return (mv - 1000) / 50;
-}
-
 static int wcd934x_init_dmic(struct snd_soc_component *comp)
 {
-	int vout_ctl_1, vout_ctl_2, vout_ctl_3, vout_ctl_4;
 	struct wcd934x_codec *wcd = dev_get_drvdata(comp->dev);
 	u32 def_dmic_rate, dmic_clk_drv;
+	int ret;
 
-	vout_ctl_1 = wcd934x_get_micbias_val(comp->dev,
-					     "qcom,micbias1-microvolt", NULL);
-	vout_ctl_2 = wcd934x_get_micbias_val(comp->dev,
-					     "qcom,micbias2-microvolt",
-					     &wcd->micb2_mv);
-	vout_ctl_3 = wcd934x_get_micbias_val(comp->dev,
-					     "qcom,micbias3-microvolt", NULL);
-	vout_ctl_4 = wcd934x_get_micbias_val(comp->dev,
-					     "qcom,micbias4-microvolt", NULL);
+	ret = wcd_dt_parse_mbhc_data(comp->dev, &wcd->mbhc_cfg);
+	if (ret)
+		return ret;
 
 	snd_soc_component_update_bits(comp, WCD934X_ANA_MICB1,
-				      WCD934X_MICB_VAL_MASK, vout_ctl_1);
+				      WCD934X_MICB_VAL_MASK, wcd->common.micb_vout[0]);
 	snd_soc_component_update_bits(comp, WCD934X_ANA_MICB2,
-				      WCD934X_MICB_VAL_MASK, vout_ctl_2);
+				      WCD934X_MICB_VAL_MASK, wcd->common.micb_vout[1]);
 	snd_soc_component_update_bits(comp, WCD934X_ANA_MICB3,
-				      WCD934X_MICB_VAL_MASK, vout_ctl_3);
+				      WCD934X_MICB_VAL_MASK, wcd->common.micb_vout[2]);
 	snd_soc_component_update_bits(comp, WCD934X_ANA_MICB4,
-				      WCD934X_MICB_VAL_MASK, vout_ctl_4);
+				      WCD934X_MICB_VAL_MASK, wcd->common.micb_vout[3]);
 
 	if (wcd->rate == WCD934X_MCLK_CLK_9P6MHZ)
 		def_dmic_rate = WCD9XXX_DMIC_SAMPLE_RATE_4P8MHZ;
···
 	}
 }
 
-static int wcd934x_get_micb_vout_ctl_val(u32 micb_mv)
-{
-	/* min micbias voltage is 1V and maximum is 2.85V */
-	if (micb_mv < 1000 || micb_mv > 2850)
-		return -EINVAL;
-
-	return (micb_mv - 1000) / 50;
-}
-
 static int wcd934x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 					    int req_volt, int micb_num)
 {
···
 	cur_vout_ctl = snd_soc_component_read_field(component, micb_reg,
 						    WCD934X_MICB_VAL_MASK);
 
-	req_vout_ctl = wcd934x_get_micb_vout_ctl_val(req_volt);
+	req_vout_ctl = wcd_get_micb_vout_ctl_val(component->dev, req_volt);
 	if (req_vout_ctl < 0) {
 		ret = -EINVAL;
 		goto exit;
···
 	 * voltage needed to detect threshold microphone, then do
 	 * not change the micbias, just return.
 	 */
-	if (wcd934x->micb2_mv >= WCD_MBHC_THR_HS_MICB_MV)
+	if (wcd934x->common.micb_mv[1] >= WCD_MBHC_THR_HS_MICB_MV)
 		return 0;
 
-	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd934x->micb2_mv;
+	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd934x->common.micb_mv[1];
 
 	rc = wcd934x_mbhc_micb_adjust_voltage(component, micb_mv, MIC_BIAS_2);
 
···
 static int wcd934x_comp_probe(struct snd_soc_component *component)
 {
 	struct wcd934x_codec *wcd = dev_get_drvdata(component->dev);
-	int i;
+	int i, ret;
 
 	snd_soc_component_init_regmap(component, wcd->regmap);
 	wcd->component = component;
···
 	for (i = 0; i < NUM_CODEC_DAIS; i++)
 		INIT_LIST_HEAD(&wcd->dai[i].slim_ch_list);
 
-	wcd934x_init_dmic(component);
+
+	ret = wcd934x_init_dmic(component);
+	if (ret) {
+		dev_err(component->dev, "Failed to Initialize micbias\n");
+		return ret;
+	}
 
 	if (wcd934x_mbhc_init(component))
 		dev_err(component->dev, "Failed to Initialize MBHC\n");
···
 	cfg->anc_micbias = MIC_BIAS_2;
 	cfg->v_hs_max = WCD_MBHC_HS_V_MAX;
 	cfg->num_btn = WCD934X_MBHC_MAX_BUTTONS;
-	cfg->micb_mv = wcd->micb2_mv;
+	cfg->micb_mv = wcd->common.micb_mv[1];
 	cfg->linein_th = 5000;
 	cfg->hs_thr = 1700;
 	cfg->hph_thr = 50;
 
 	wcd_dt_parse_mbhc_data(dev, cfg);
-
 
 	return 0;
 }
···
 	wcd->sdev = to_slim_device(data->dev);
 	mutex_init(&wcd->sysclk_mutex);
 	mutex_init(&wcd->micb_lock);
+	wcd->common.dev = dev->parent;
+	wcd->common.max_bias = 4;
 
 	ret = wcd934x_codec_parse_data(wcd);
 	if (ret)

sound/soc/codecs/wcd937x.c

···
 #include <sound/tlv.h>
 
 #include "wcd-clsh-v2.h"
+#include "wcd-common.h"
 #include "wcd-mbhc-v2.h"
 #include "wcd937x.h"
 
···
 	struct wcd_mbhc_config mbhc_cfg;
 	struct wcd_mbhc_intr intr_ids;
 	struct wcd_clsh_ctrl *clsh_info;
+	struct wcd_common common;
 	struct irq_domain *virq;
 	struct regmap_irq_chip_data *irq_chip;
 	struct snd_soc_jack *jack;
···
 	s32 pullup_ref[WCD937X_MAX_MICBIAS];
 	u32 hph_mode;
 	int ear_rx_path;
-	u32 micb1_mv;
-	u32 micb2_mv;
-	u32 micb3_mv;
 	int hphr_pdm_wd_int;
 	int hphl_pdm_wd_int;
 	int aux_pdm_wd_int;
···
 	return 0;
 }
 
-static int wcd937x_get_micb_vout_ctl_val(u32 micb_mv)
-{
-	if (micb_mv < 1000 || micb_mv > 2850) {
-		pr_err("Unsupported micbias voltage (%u mV)\n", micb_mv);
-		return -EINVAL;
-	}
-
-	return (micb_mv - 1000) / 50;
-}
 
 static int wcd937x_tx_swr_ctrl(struct snd_soc_dapm_widget *w,
 			       struct snd_kcontrol *kcontrol, int event)
···
 	cur_vout_ctl = snd_soc_component_read_field(component, micb_reg,
 						    WCD937X_MICB_VOUT_MASK);
 
-	req_vout_ctl = wcd937x_get_micb_vout_ctl_val(req_volt);
+	req_vout_ctl = wcd_get_micb_vout_ctl_val(component->dev, req_volt);
 	if (req_vout_ctl < 0) {
 		ret = -EINVAL;
 		goto exit;
···
 	 * voltage needed to detect threshold microphone, then do
 	 * not change the micbias, just return.
 	 */
-	if (wcd937x->micb2_mv >= WCD_MBHC_THR_HS_MICB_MV)
+	if (wcd937x->common.micb_mv[2] >= WCD_MBHC_THR_HS_MICB_MV)
 		return 0;
 
-	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd937x->micb2_mv;
+	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd937x->common.micb_mv[2];
 
 	return wcd937x_mbhc_micb_adjust_voltage(component, micb_mv, MIC_BIAS_2);
 }
···
 	{ "DMIC6_MIXER", "Switch", "DMIC6" },
 };
 
-static int wcd937x_set_micbias_data(struct wcd937x_priv *wcd937x)
+static void wcd937x_set_micbias_data(struct device *dev, struct wcd937x_priv *wcd937x)
 {
-	int vout_ctl[3];
-
-	/* Set micbias voltage */
-	vout_ctl[0] = wcd937x_get_micb_vout_ctl_val(wcd937x->micb1_mv);
-	vout_ctl[1] = wcd937x_get_micb_vout_ctl_val(wcd937x->micb2_mv);
-	vout_ctl[2] = wcd937x_get_micb_vout_ctl_val(wcd937x->micb3_mv);
-	if ((vout_ctl[0] | vout_ctl[1] | vout_ctl[2]) < 0)
-		return -EINVAL;
-
-	regmap_update_bits(wcd937x->regmap, WCD937X_ANA_MICB1, WCD937X_ANA_MICB_VOUT, vout_ctl[0]);
-	regmap_update_bits(wcd937x->regmap, WCD937X_ANA_MICB2, WCD937X_ANA_MICB_VOUT, vout_ctl[1]);
-	regmap_update_bits(wcd937x->regmap, WCD937X_ANA_MICB3, WCD937X_ANA_MICB_VOUT, vout_ctl[2]);
-
-	return 0;
+	regmap_update_bits(wcd937x->regmap, WCD937X_ANA_MICB1, WCD937X_ANA_MICB_VOUT,
+			wcd937x->common.micb_vout[0]);
+	regmap_update_bits(wcd937x->regmap, WCD937X_ANA_MICB2, WCD937X_ANA_MICB_VOUT,
+			wcd937x->common.micb_vout[1]);
+	regmap_update_bits(wcd937x->regmap, WCD937X_ANA_MICB3, WCD937X_ANA_MICB_VOUT,
+			wcd937x->common.micb_vout[2]);
 }
 
 static irqreturn_t wcd937x_wd_handle_irq(int irq, void *data)
···
 	.set_jack = wcd937x_codec_set_jack,
 	.endianness = 1,
 };
-
-static void wcd937x_dt_parse_micbias_info(struct device *dev, struct wcd937x_priv *wcd)
-{
-	struct device_node *np = dev->of_node;
-	u32 prop_val = 0;
-	int ret = 0;
-
-	ret = of_property_read_u32(np, "qcom,micbias1-microvolt", &prop_val);
-	if (!ret)
-		wcd->micb1_mv = prop_val / 1000;
-	else
-		dev_warn(dev, "Micbias1 DT property not found\n");
-
-	ret = of_property_read_u32(np, "qcom,micbias2-microvolt", &prop_val);
-	if (!ret)
-		wcd->micb2_mv = prop_val / 1000;
-	else
-		dev_warn(dev, "Micbias2 DT property not found\n");
-
-	ret = of_property_read_u32(np, "qcom,micbias3-microvolt", &prop_val);
-	if (!ret)
-		wcd->micb3_mv = prop_val / 1000;
-	else
-		dev_warn(dev, "Micbias3 DT property not found\n");
-}
 
 static bool wcd937x_swap_gnd_mic(struct snd_soc_component *component)
 {
···
 	wcd937x->sdw_priv[AIF1_PB]->slave_irq = wcd937x->virq;
 	wcd937x->sdw_priv[AIF1_CAP]->slave_irq = wcd937x->virq;
 
-	ret = wcd937x_set_micbias_data(wcd937x);
-	if (ret < 0) {
-		dev_err(dev, "Bad micbias pdata\n");
-		return ret;
-	}
+	wcd937x_set_micbias_data(dev, wcd937x);
 
 	ret = snd_soc_register_component(dev, &soc_codec_dev_wcd937x,
 					 wcd937x_dais, ARRAY_SIZE(wcd937x_dais));
···
 
 	dev_set_drvdata(dev, wcd937x);
 	mutex_init(&wcd937x->micb_lock);
+	wcd937x->common.dev = dev;
+	wcd937x->common.max_bias = 3;
 
 	wcd937x->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(wcd937x->reset_gpio))
···
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to get and enable supplies\n");
 
-	wcd937x_dt_parse_micbias_info(dev, wcd937x);
+	ret = wcd_dt_parse_micbias_info(&wcd937x->common);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get micbias\n");
 
 	cfg->mbhc_micbias = MIC_BIAS_2;
 	cfg->anc_micbias = MIC_BIAS_2;
 	cfg->v_hs_max = WCD_MBHC_HS_V_MAX;
 	cfg->num_btn = WCD937X_MBHC_MAX_BUTTONS;
-	cfg->micb_mv = wcd937x->micb2_mv;
+	cfg->micb_mv = wcd937x->common.micb_mv[2];
 	cfg->linein_th = 5000;
 	cfg->hs_thr = 1700;
 	cfg->hph_thr = 50;

sound/soc/codecs/wcd938x.c

···
 #include <linux/regulator/consumer.h>
 
 #include "wcd-clsh-v2.h"
+#include "wcd-common.h"
 #include "wcd-mbhc-v2.h"
 #include "wcd938x.h"
 
···
 	struct wcd_mbhc_config mbhc_cfg;
 	struct wcd_mbhc_intr intr_ids;
 	struct wcd_clsh_ctrl *clsh_info;
+	struct wcd_common common;
 	struct irq_domain *virq;
 	struct regmap_irq_chip_data *irq_chip;
 	struct snd_soc_jack *jack;
···
 	struct gpio_desc *us_euro_gpio;
 	struct mux_control *us_euro_mux;
 	unsigned int mux_state;
-	u32 micb1_mv;
-	u32 micb2_mv;
-	u32 micb3_mv;
-	u32 micb4_mv;
 	int hphr_pdm_wd_int;
 	int hphl_pdm_wd_int;
 	int aux_pdm_wd_int;
···
 	}
 }
 
-static int wcd938x_get_micb_vout_ctl_val(u32 micb_mv)
-{
-	/* min micbias voltage is 1V and maximum is 2.85V */
-	if (micb_mv < 1000 || micb_mv > 2850)
-		return -EINVAL;
-
-	return (micb_mv - 1000) / 50;
-}
-
 static int wcd938x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 					    int req_volt, int micb_num)
 {
···
 	cur_vout_ctl = snd_soc_component_read_field(component, micb_reg,
 						    WCD938X_MICB_VOUT_MASK);
 
-	req_vout_ctl = wcd938x_get_micb_vout_ctl_val(req_volt);
+	req_vout_ctl = wcd_get_micb_vout_ctl_val(component->dev, req_volt);
 	if (req_vout_ctl < 0) {
 		ret = -EINVAL;
 		goto exit;
···
 	 * voltage needed to detect threshold microphone, then do
 	 * not change the micbias, just return.
 	 */
-	if (wcd938x->micb2_mv >= WCD_MBHC_THR_HS_MICB_MV)
+	if (wcd938x->common.micb_mv[2] >= WCD_MBHC_THR_HS_MICB_MV)
 		return 0;
 
-	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd938x->micb2_mv;
+	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd938x->common.micb_mv[2];
 
 	return wcd938x_mbhc_micb_adjust_voltage(component, micb_mv, MIC_BIAS_2);
 }
···
 	{"EAR", NULL, "EAR PGA"},
 };
 
-static int wcd938x_set_micbias_data(struct wcd938x_priv *wcd938x)
+static void wcd938x_set_micbias_data(struct device *dev, struct wcd938x_priv *wcd938x)
 {
-	int vout_ctl_1, vout_ctl_2, vout_ctl_3, vout_ctl_4;
-
-	/* set micbias voltage */
-	vout_ctl_1 = wcd938x_get_micb_vout_ctl_val(wcd938x->micb1_mv);
-	vout_ctl_2 = wcd938x_get_micb_vout_ctl_val(wcd938x->micb2_mv);
-	vout_ctl_3 = wcd938x_get_micb_vout_ctl_val(wcd938x->micb3_mv);
-	vout_ctl_4 = wcd938x_get_micb_vout_ctl_val(wcd938x->micb4_mv);
-	if (vout_ctl_1 < 0 || vout_ctl_2 < 0 || vout_ctl_3 < 0 || vout_ctl_4 < 0)
-		return -EINVAL;
-
 	regmap_update_bits(wcd938x->regmap, WCD938X_ANA_MICB1,
-			   WCD938X_MICB_VOUT_MASK, vout_ctl_1);
+			   WCD938X_MICB_VOUT_MASK, wcd938x->common.micb_vout[0]);
 	regmap_update_bits(wcd938x->regmap, WCD938X_ANA_MICB2,
-			   WCD938X_MICB_VOUT_MASK, vout_ctl_2);
+			   WCD938X_MICB_VOUT_MASK, wcd938x->common.micb_vout[1]);
 	regmap_update_bits(wcd938x->regmap, WCD938X_ANA_MICB3,
-			   WCD938X_MICB_VOUT_MASK, vout_ctl_3);
+			   WCD938X_MICB_VOUT_MASK, wcd938x->common.micb_vout[2]);
 	regmap_update_bits(wcd938x->regmap, WCD938X_ANA_MICB4,
-			   WCD938X_MICB_VOUT_MASK, vout_ctl_4);
-
-	return 0;
+			   WCD938X_MICB_VOUT_MASK, wcd938x->common.micb_vout[3]);
 }
 
 static irqreturn_t wcd938x_wd_handle_irq(int irq, void *data)
···
 	.endianness = 1,
 };
 
-static void wcd938x_dt_parse_micbias_info(struct device *dev, struct wcd938x_priv *wcd)
-{
-	struct device_node *np = dev->of_node;
-	u32 prop_val = 0;
-	int rc = 0;
-
-	rc = of_property_read_u32(np, "qcom,micbias1-microvolt",  &prop_val);
-	if (!rc)
-		wcd->micb1_mv = prop_val/1000;
-	else
-		dev_info(dev, "%s: Micbias1 DT property not found\n", __func__);
-
-	rc = of_property_read_u32(np, "qcom,micbias2-microvolt",  &prop_val);
-	if (!rc)
-		wcd->micb2_mv = prop_val/1000;
-	else
-		dev_info(dev, "%s: Micbias2 DT property not found\n", __func__);
-
-	rc = of_property_read_u32(np, "qcom,micbias3-microvolt", &prop_val);
-	if (!rc)
-		wcd->micb3_mv = prop_val/1000;
-	else
-		dev_info(dev, "%s: Micbias3 DT property not found\n", __func__);
-
-	rc = of_property_read_u32(np, "qcom,micbias4-microvolt",  &prop_val);
-	if (!rc)
-		wcd->micb4_mv = prop_val/1000;
-	else
-		dev_info(dev, "%s: Micbias4 DT property not found\n", __func__);
-}
-
 static bool wcd938x_swap_gnd_mic(struct snd_soc_component *component)
 {
 	struct wcd938x_priv *wcd938x = snd_soc_component_get_drvdata(component);
···
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to get and enable supplies\n");
 
-	wcd938x_dt_parse_micbias_info(dev, wcd938x);
+	ret = wcd_dt_parse_micbias_info(&wcd938x->common);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get and enable supplies\n");
 
 	cfg->mbhc_micbias = MIC_BIAS_2;
 	cfg->anc_micbias = MIC_BIAS_2;
 	cfg->v_hs_max = WCD_MBHC_HS_V_MAX;
 	cfg->num_btn = WCD938X_MBHC_MAX_BUTTONS;
-	cfg->micb_mv = wcd938x->micb2_mv;
+	cfg->micb_mv = wcd938x->common.micb_mv[2];
 	cfg->linein_th = 5000;
 	cfg->hs_thr = 1700;
 	cfg->hph_thr = 50;
···
 	wcd938x->sdw_priv[AIF1_PB]->slave_irq = wcd938x->virq;
 	wcd938x->sdw_priv[AIF1_CAP]->slave_irq = wcd938x->virq;
 
-	ret = wcd938x_set_micbias_data(wcd938x);
-	if (ret < 0) {
-		dev_err(dev, "%s: bad micbias pdata\n", __func__);
-		goto err_remove_rx_link;
-	}
+	wcd938x_set_micbias_data(dev, wcd938x);
 
 	ret = snd_soc_register_component(dev, &soc_codec_dev_wcd938x,
 					 wcd938x_dais, ARRAY_SIZE(wcd938x_dais));
···
 
 	dev_set_drvdata(dev, wcd938x);
 	mutex_init(&wcd938x->micb_lock);
+	wcd938x->common.dev = dev;
+	wcd938x->common.max_bias = 4;
 
 	ret = wcd938x_populate_dt_data(wcd938x, dev);
 	if (ret)

sound/soc/codecs/wcd939x.c

···
 #include <linux/usb/typec_altmode.h>
 
 #include "wcd-clsh-v2.h"
+#include "wcd-common.h"
 #include "wcd-mbhc-v2.h"
 #include "wcd939x.h"
 
···
 	struct wcd_mbhc_config mbhc_cfg;
 	struct wcd_mbhc_intr intr_ids;
 	struct wcd_clsh_ctrl *clsh_info;
+	struct wcd_common common;
 	struct irq_domain *virq;
 	struct regmap_irq_chip_data *irq_chip;
 	struct snd_soc_jack *jack;
···
 	u32 tx_mode[TX_ADC_MAX];
 	int variant;
 	struct gpio_desc *reset_gpio;
-	u32 micb1_mv;
-	u32 micb2_mv;
-	u32 micb3_mv;
-	u32 micb4_mv;
 	int hphr_pdm_wd_int;
 	int hphl_pdm_wd_int;
 	int ear_pdm_wd_int;
···
 	}
 }
 
-static int wcd939x_get_micb_vout_ctl_val(u32 micb_mv)
-{
-	/* min micbias voltage is 1V and maximum is 2.85V */
-	if (micb_mv < 1000 || micb_mv > 2850) {
-		pr_err("%s: unsupported micbias voltage\n", __func__);
-		return -EINVAL;
-	}
-
-	return (micb_mv - 1000) / 50;
-}
-
 static int wcd939x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 					    int req_volt, int micb_num)
 {
···
 	cur_vout_ctl = snd_soc_component_read_field(component, micb_reg,
 						    WCD939X_MICB_VOUT_CTL);
 
-	req_vout_ctl = wcd939x_get_micb_vout_ctl_val(req_volt);
+	req_vout_ctl = wcd_get_micb_vout_ctl_val(component->dev, req_volt);
 	if (req_vout_ctl < 0) {
 		ret = req_vout_ctl;
 		goto exit;
···
 	 * voltage needed to detect threshold microphone, then do
 	 * not change the micbias, just return.
 	 */
-	if (wcd939x->micb2_mv >= WCD_MBHC_THR_HS_MICB_MV)
+	if (wcd939x->common.micb_mv[1] >= WCD_MBHC_THR_HS_MICB_MV)
 		return 0;
 
-	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd939x->micb2_mv;
+	micb_mv = req_en ? WCD_MBHC_THR_HS_MICB_MV : wcd939x->common.micb_mv[1];
 
 	return wcd939x_mbhc_micb_adjust_voltage(component, micb_mv, MIC_BIAS_2);
 }
···
 	{"EAR", NULL, "EAR PGA"},
 };
 
-static int wcd939x_set_micbias_data(struct wcd939x_priv *wcd939x)
+static void wcd939x_set_micbias_data(struct device *dev, struct wcd939x_priv *wcd939x)
 {
-	int vout_ctl_1, vout_ctl_2, vout_ctl_3, vout_ctl_4;
-
-	/* set micbias voltage */
-	vout_ctl_1 = wcd939x_get_micb_vout_ctl_val(wcd939x->micb1_mv);
-	vout_ctl_2 = wcd939x_get_micb_vout_ctl_val(wcd939x->micb2_mv);
-	vout_ctl_3 = wcd939x_get_micb_vout_ctl_val(wcd939x->micb3_mv);
-	vout_ctl_4 = wcd939x_get_micb_vout_ctl_val(wcd939x->micb4_mv);
-	if (vout_ctl_1 < 0 || vout_ctl_2 < 0 || vout_ctl_3 < 0 || vout_ctl_4 < 0)
-		return -EINVAL;
-
 	regmap_update_bits(wcd939x->regmap, WCD939X_ANA_MICB1,
-			   WCD939X_MICB_VOUT_CTL, vout_ctl_1);
+			   WCD939X_MICB_VOUT_CTL, wcd939x->common.micb_vout[0]);
 	regmap_update_bits(wcd939x->regmap, WCD939X_ANA_MICB2,
-			   WCD939X_MICB_VOUT_CTL, vout_ctl_2);
+			   WCD939X_MICB_VOUT_CTL, wcd939x->common.micb_vout[1]);
 	regmap_update_bits(wcd939x->regmap, WCD939X_ANA_MICB3,
-			   WCD939X_MICB_VOUT_CTL, vout_ctl_3);
+			   WCD939X_MICB_VOUT_CTL, wcd939x->common.micb_vout[2]);
 	regmap_update_bits(wcd939x->regmap, WCD939X_ANA_MICB4,
-			   WCD939X_MICB_VOUT_CTL, vout_ctl_4);
-
-	return 0;
+			   WCD939X_MICB_VOUT_CTL, wcd939x->common.micb_vout[3]);
 }
 
 static irqreturn_t wcd939x_wd_handle_irq(int irq, void *data)
···
 }
 #endif /* CONFIG_TYPEC */
 
-static void wcd939x_dt_parse_micbias_info(struct device *dev, struct wcd939x_priv *wcd)
-{
-	struct device_node *np = dev->of_node;
-	u32 prop_val = 0;
-	int rc = 0;
-
-	rc = of_property_read_u32(np, "qcom,micbias1-microvolt",  &prop_val);
-	if (!rc)
-		wcd->micb1_mv = prop_val / 1000;
-	else
-		dev_info(dev, "%s: Micbias1 DT property not found\n", __func__);
-
-	rc = of_property_read_u32(np, "qcom,micbias2-microvolt",  &prop_val);
-	if (!rc)
-		wcd->micb2_mv = prop_val / 1000;
-	else
-		dev_info(dev, "%s: Micbias2 DT property not found\n", __func__);
-
-	rc = of_property_read_u32(np, "qcom,micbias3-microvolt", &prop_val);
-	if (!rc)
-		wcd->micb3_mv = prop_val / 1000;
-	else
-		dev_info(dev, "%s: Micbias3 DT property not found\n", __func__);
-
-	rc = of_property_read_u32(np, "qcom,micbias4-microvolt",  &prop_val);
-	if (!rc)
-		wcd->micb4_mv = prop_val / 1000;
-	else
-		dev_info(dev, "%s: Micbias4 DT property not found\n", __func__);
-}
-
 #if IS_ENABLED(CONFIG_TYPEC)
 static bool wcd939x_swap_gnd_mic(struct snd_soc_component *component)
 {
···
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to get and enable supplies\n");
 
-	wcd939x_dt_parse_micbias_info(dev, wcd939x);
+	ret = wcd_dt_parse_micbias_info(&wcd939x->common);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get micbias\n");
 
 	cfg->mbhc_micbias = MIC_BIAS_2;
 	cfg->anc_micbias = MIC_BIAS_2;
 	cfg->v_hs_max = WCD_MBHC_HS_V_MAX;
 	cfg->num_btn = WCD939X_MBHC_MAX_BUTTONS;
-	cfg->micb_mv = wcd939x->micb2_mv;
+	cfg->micb_mv = wcd939x->common.micb_mv[1];
 	cfg->linein_th = 5000;
 	cfg->hs_thr = 1700;
 	cfg->hph_thr = 50;
···
 	wcd939x->sdw_priv[AIF1_PB]->slave_irq = wcd939x->virq;
 	wcd939x->sdw_priv[AIF1_CAP]->slave_irq = wcd939x->virq;
 
-	ret = wcd939x_set_micbias_data(wcd939x);
-	if (ret < 0) {
-		dev_err(dev, "%s: bad micbias pdata\n", __func__);
-		goto err_remove_rx_link;
-	}
+	wcd939x_set_micbias_data(dev, wcd939x);
 
 	/* Check WCD9395 version */
 	regmap_read(wcd939x->regmap, WCD939X_DIGITAL_CHIP_ID1, &id1);
···
 
 	dev_set_drvdata(dev, wcd939x);
 	mutex_init(&wcd939x->micb_lock);
+	wcd939x->common.dev = dev;
+	wcd939x->common.max_bias = 4;
 
 	ret = wcd939x_populate_dt_data(wcd939x, dev);
 	if (ret) {