ASoC: wcd9335: add CLASS-H Controller support

CLASS-H controller/Amplifier is common accorss Qualcomm WCD codec series.
This patchset adds basic CLASS-H controller apis for WCD codecs after
wcd9335 to use.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 576 insertions, 0 deletions

diff --git a/sound/soc/codecs/wcd-clsh-v2.c b/sound/soc/codecs/wcd-clsh-v2.c
new file mode 100644
index 000000000000..1bd70c5a7b63
--- /dev/null
+++ b/sound/soc/codecs/wcd-clsh-v2.c
@@ -0,0 +1,576 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+// Copyright (c) 2017-2018, Linaro Limited
+
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include "wcd9335.h"
+#include "wcd-clsh-v2.h"
+
+struct wcd_clsh_ctrl {
+	int state;
+	int mode;
+	int flyback_users;
+	int buck_users;
+	int clsh_users;
+	int codec_version;
+	struct snd_soc_component *comp;
+};
+
+/* Class-H registers for codecs from and above WCD9335 */
+#define WCD9XXX_A_CDC_RX0_RX_PATH_CFG0			WCD9335_REG(0xB, 0x42)
+#define WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK		BIT(6)
+#define WCD9XXX_A_CDC_RX_PATH_CLSH_ENABLE		BIT(6)
+#define WCD9XXX_A_CDC_RX_PATH_CLSH_DISABLE		0
+#define WCD9XXX_A_CDC_RX1_RX_PATH_CFG0			WCD9335_REG(0xB, 0x56)
+#define WCD9XXX_A_CDC_RX2_RX_PATH_CFG0			WCD9335_REG(0xB, 0x6A)
+#define WCD9XXX_A_CDC_CLSH_K1_MSB			WCD9335_REG(0xC, 0x08)
+#define WCD9XXX_A_CDC_CLSH_K1_MSB_COEF_MASK		GENMASK(3, 0)
+#define WCD9XXX_A_CDC_CLSH_K1_LSB			WCD9335_REG(0xC, 0x09)
+#define WCD9XXX_A_CDC_CLSH_K1_LSB_COEF_MASK		GENMASK(7, 0)
+#define WCD9XXX_A_ANA_RX_SUPPLIES			WCD9335_REG(0x6, 0x08)
+#define WCD9XXX_A_ANA_RX_REGULATOR_MODE_MASK		BIT(1)
+#define WCD9XXX_A_ANA_RX_REGULATOR_MODE_CLS_H		0
+#define WCD9XXX_A_ANA_RX_REGULATOR_MODE_CLS_AB		BIT(1)
+#define WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_MASK		BIT(2)
+#define WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_UHQA		BIT(2)
+#define WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_DEFAULT		0
+#define WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_MASK		BIT(3)
+#define WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_UHQA		BIT(3)
+#define WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_DEFAULT		0
+#define WCD9XXX_A_ANA_RX_VNEG_EN_MASK			BIT(6)
+#define WCD9XXX_A_ANA_RX_VNEG_EN_SHIFT			6
+#define WCD9XXX_A_ANA_RX_VNEG_ENABLE			BIT(6)
+#define WCD9XXX_A_ANA_RX_VNEG_DISABLE			0
+#define WCD9XXX_A_ANA_RX_VPOS_EN_MASK			BIT(7)
+#define WCD9XXX_A_ANA_RX_VPOS_EN_SHIFT			7
+#define WCD9XXX_A_ANA_RX_VPOS_ENABLE			BIT(7)
+#define WCD9XXX_A_ANA_RX_VPOS_DISABLE			0
+#define WCD9XXX_A_ANA_HPH				WCD9335_REG(0x6, 0x09)
+#define WCD9XXX_A_ANA_HPH_PWR_LEVEL_MASK		GENMASK(3, 2)
+#define WCD9XXX_A_ANA_HPH_PWR_LEVEL_UHQA		0x08
+#define WCD9XXX_A_ANA_HPH_PWR_LEVEL_LP			0x04
+#define WCD9XXX_A_ANA_HPH_PWR_LEVEL_NORMAL		0x0
+#define WCD9XXX_A_CDC_CLSH_CRC				WCD9335_REG(0xC, 0x01)
+#define WCD9XXX_A_CDC_CLSH_CRC_CLK_EN_MASK		BIT(0)
+#define WCD9XXX_A_CDC_CLSH_CRC_CLK_ENABLE		BIT(0)
+#define WCD9XXX_A_CDC_CLSH_CRC_CLK_DISABLE		0
+#define WCD9XXX_FLYBACK_EN				WCD9335_REG(0x6, 0xA4)
+#define WCD9XXX_FLYBACK_EN_DELAY_SEL_MASK		GENMASK(6, 5)
+#define WCD9XXX_FLYBACK_EN_DELAY_26P25_US		0x40
+#define WCD9XXX_FLYBACK_EN_RESET_BY_EXT_MASK		BIT(4)
+#define WCD9XXX_FLYBACK_EN_PWDN_WITHOUT_DELAY		BIT(4)
+#define WCD9XXX_FLYBACK_EN_PWDN_WITH_DELAY			0
+#define WCD9XXX_RX_BIAS_FLYB_BUFF			WCD9335_REG(0x6, 0xC7)
+#define WCD9XXX_RX_BIAS_FLYB_VNEG_5_UA_MASK		GENMASK(7, 4)
+#define WCD9XXX_RX_BIAS_FLYB_VPOS_5_UA_MASK		GENMASK(0, 3)
+#define WCD9XXX_HPH_L_EN				WCD9335_REG(0x6, 0xD3)
+#define WCD9XXX_HPH_CONST_SEL_L_MASK			GENMASK(7, 3)
+#define WCD9XXX_HPH_CONST_SEL_BYPASS			0
+#define WCD9XXX_HPH_CONST_SEL_LP_PATH			0x40
+#define WCD9XXX_HPH_CONST_SEL_HQ_PATH			0x80
+#define WCD9XXX_HPH_R_EN				WCD9335_REG(0x6, 0xD6)
+#define WCD9XXX_HPH_REFBUFF_UHQA_CTL			WCD9335_REG(0x6, 0xDD)
+#define WCD9XXX_HPH_REFBUFF_UHQA_GAIN_MASK		GENMASK(2, 0)
+#define WCD9XXX_CLASSH_CTRL_VCL_2                       WCD9335_REG(0x6, 0x9B)
+#define WCD9XXX_CLASSH_CTRL_VCL_2_VREF_FILT_1_MASK	GENMASK(5, 4)
+#define WCD9XXX_CLASSH_CTRL_VCL_VREF_FILT_R_50KOHM	0x20
+#define WCD9XXX_CLASSH_CTRL_VCL_VREF_FILT_R_0KOHM	0x0
+#define WCD9XXX_CDC_RX1_RX_PATH_CTL			WCD9335_REG(0xB, 0x55)
+#define WCD9XXX_CDC_RX2_RX_PATH_CTL			WCD9335_REG(0xB, 0x69)
+#define WCD9XXX_CDC_CLK_RST_CTRL_MCLK_CONTROL		WCD9335_REG(0xD, 0x41)
+#define WCD9XXX_CDC_CLK_RST_CTRL_MCLK_EN_MASK		BIT(0)
+#define WCD9XXX_CDC_CLK_RST_CTRL_MCLK_11P3_EN_MASK	BIT(1)
+#define WCD9XXX_CLASSH_CTRL_CCL_1                       WCD9335_REG(0x6, 0x9C)
+#define WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_MASK	GENMASK(7, 4)
+#define WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_50MA	0x50
+#define WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_30MA	0x30
+
+#define CLSH_REQ_ENABLE		true
+#define CLSH_REQ_DISABLE	false
+#define WCD_USLEEP_RANGE	50
+
+enum {
+	DAC_GAIN_0DB = 0,
+	DAC_GAIN_0P2DB,
+	DAC_GAIN_0P4DB,
+	DAC_GAIN_0P6DB,
+	DAC_GAIN_0P8DB,
+	DAC_GAIN_M0P2DB,
+	DAC_GAIN_M0P4DB,
+	DAC_GAIN_M0P6DB,
+};
+
+static inline void wcd_enable_clsh_block(struct wcd_clsh_ctrl *ctrl,
+					 bool enable)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	if ((enable && ++ctrl->clsh_users == 1) ||
+	    (!enable && --ctrl->clsh_users == 0))
+		snd_soc_component_update_bits(comp, WCD9XXX_A_CDC_CLSH_CRC,
+				      WCD9XXX_A_CDC_CLSH_CRC_CLK_EN_MASK,
+				      enable);
+	if (ctrl->clsh_users < 0)
+		ctrl->clsh_users = 0;
+}
+
+static inline bool wcd_clsh_enable_status(struct snd_soc_component *comp)
+{
+	return snd_soc_component_read32(comp, WCD9XXX_A_CDC_CLSH_CRC) &
+					WCD9XXX_A_CDC_CLSH_CRC_CLK_EN_MASK;
+}
+
+static inline void wcd_clsh_set_buck_mode(struct snd_soc_component *comp,
+					  int mode)
+{
+	/* set to HIFI */
+	if (mode == CLS_H_HIFI)
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+					WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_MASK,
+					WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_UHQA);
+	else
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+					WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_MASK,
+					WCD9XXX_A_ANA_RX_VPOS_PWR_LVL_DEFAULT);
+}
+
+static inline void wcd_clsh_set_flyback_mode(struct snd_soc_component *comp,
+					     int mode)
+{
+	/* set to HIFI */
+	if (mode == CLS_H_HIFI)
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+					WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_MASK,
+					WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_UHQA);
+	else
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+					WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_MASK,
+					WCD9XXX_A_ANA_RX_VNEG_PWR_LVL_DEFAULT);
+}
+
+static void wcd_clsh_buck_ctrl(struct wcd_clsh_ctrl *ctrl,
+			       int mode,
+			       bool enable)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	/* enable/disable buck */
+	if ((enable && (++ctrl->buck_users == 1)) ||
+	   (!enable && (--ctrl->buck_users == 0)))
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+				WCD9XXX_A_ANA_RX_VPOS_EN_MASK,
+				enable << WCD9XXX_A_ANA_RX_VPOS_EN_SHIFT);
+	/*
+	 * 500us sleep is required after buck enable/disable
+	 * as per HW requirement
+	 */
+	usleep_range(500, 500 + WCD_USLEEP_RANGE);
+}
+
+static void wcd_clsh_flyback_ctrl(struct wcd_clsh_ctrl *ctrl,
+				  int mode,
+				  bool enable)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	/* enable/disable flyback */
+	if ((enable && (++ctrl->flyback_users == 1)) ||
+	   (!enable && (--ctrl->flyback_users == 0))) {
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+				WCD9XXX_A_ANA_RX_VNEG_EN_MASK,
+				enable << WCD9XXX_A_ANA_RX_VNEG_EN_SHIFT);
+		/* 100usec delay is needed as per HW requirement */
+		usleep_range(100, 110);
+	}
+	/*
+	 * 500us sleep is required after flyback enable/disable
+	 * as per HW requirement
+	 */
+	usleep_range(500, 500 + WCD_USLEEP_RANGE);
+}
+
+static void wcd_clsh_set_gain_path(struct wcd_clsh_ctrl *ctrl, int mode)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+	int val = 0;
+
+	switch (mode) {
+	case CLS_H_NORMAL:
+	case CLS_AB:
+		val = WCD9XXX_HPH_CONST_SEL_BYPASS;
+		break;
+	case CLS_H_HIFI:
+		val = WCD9XXX_HPH_CONST_SEL_HQ_PATH;
+		break;
+	case CLS_H_LP:
+		val = WCD9XXX_HPH_CONST_SEL_LP_PATH;
+		break;
+	};
+
+	snd_soc_component_update_bits(comp, WCD9XXX_HPH_L_EN,
+					WCD9XXX_HPH_CONST_SEL_L_MASK,
+					val);
+
+	snd_soc_component_update_bits(comp, WCD9XXX_HPH_R_EN,
+					WCD9XXX_HPH_CONST_SEL_L_MASK,
+					val);
+}
+
+static void wcd_clsh_set_hph_mode(struct snd_soc_component *comp,
+				  int mode)
+{
+	int val = 0, gain = 0, res_val;
+	int ipeak = WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_50MA;
+
+	res_val = WCD9XXX_CLASSH_CTRL_VCL_VREF_FILT_R_0KOHM;
+	switch (mode) {
+	case CLS_H_NORMAL:
+		res_val = WCD9XXX_CLASSH_CTRL_VCL_VREF_FILT_R_50KOHM;
+		val = WCD9XXX_A_ANA_HPH_PWR_LEVEL_NORMAL;
+		gain = DAC_GAIN_0DB;
+		ipeak = WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_50MA;
+		break;
+	case CLS_AB:
+		val = WCD9XXX_A_ANA_HPH_PWR_LEVEL_NORMAL;
+		gain = DAC_GAIN_0DB;
+		ipeak = WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_50MA;
+		break;
+	case CLS_H_HIFI:
+		val = WCD9XXX_A_ANA_HPH_PWR_LEVEL_UHQA;
+		gain = DAC_GAIN_M0P2DB;
+		ipeak = WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_50MA;
+		break;
+	case CLS_H_LP:
+		val = WCD9XXX_A_ANA_HPH_PWR_LEVEL_LP;
+		ipeak = WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_30MA;
+		break;
+	};
+
+	snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_HPH,
+					WCD9XXX_A_ANA_HPH_PWR_LEVEL_MASK, val);
+	snd_soc_component_update_bits(comp, WCD9XXX_CLASSH_CTRL_VCL_2,
+				WCD9XXX_CLASSH_CTRL_VCL_2_VREF_FILT_1_MASK,
+				res_val);
+	if (mode != CLS_H_LP)
+		snd_soc_component_update_bits(comp,
+					WCD9XXX_HPH_REFBUFF_UHQA_CTL,
+					WCD9XXX_HPH_REFBUFF_UHQA_GAIN_MASK,
+					gain);
+	snd_soc_component_update_bits(comp, WCD9XXX_CLASSH_CTRL_CCL_1,
+				WCD9XXX_CLASSH_CTRL_CCL_1_DELTA_IPEAK_MASK,
+				ipeak);
+}
+
+static void wcd_clsh_set_flyback_current(struct snd_soc_component *comp,
+					 int mode)
+{
+
+	snd_soc_component_update_bits(comp, WCD9XXX_RX_BIAS_FLYB_BUFF,
+				WCD9XXX_RX_BIAS_FLYB_VPOS_5_UA_MASK, 0x0A);
+	snd_soc_component_update_bits(comp, WCD9XXX_RX_BIAS_FLYB_BUFF,
+				WCD9XXX_RX_BIAS_FLYB_VNEG_5_UA_MASK, 0x0A);
+	/* Sleep needed to avoid click and pop as per HW requirement */
+	usleep_range(100, 110);
+}
+
+static void wcd_clsh_set_buck_regulator_mode(struct snd_soc_component *comp,
+					     int mode)
+{
+	if (mode == CLS_AB)
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+					WCD9XXX_A_ANA_RX_REGULATOR_MODE_MASK,
+					WCD9XXX_A_ANA_RX_REGULATOR_MODE_CLS_AB);
+	else
+		snd_soc_component_update_bits(comp, WCD9XXX_A_ANA_RX_SUPPLIES,
+					WCD9XXX_A_ANA_RX_REGULATOR_MODE_MASK,
+					WCD9XXX_A_ANA_RX_REGULATOR_MODE_CLS_H);
+}
+
+static void wcd_clsh_state_lo(struct wcd_clsh_ctrl *ctrl, int req_state,
+			      bool is_enable, int mode)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	if (mode != CLS_AB) {
+		dev_err(comp->dev, "%s: LO cannot be in this mode: %d\n",
+			__func__, mode);
+		return;
+	}
+
+	if (is_enable) {
+		wcd_clsh_set_buck_regulator_mode(comp, mode);
+		wcd_clsh_set_buck_mode(comp, mode);
+		wcd_clsh_set_flyback_mode(comp, mode);
+		wcd_clsh_flyback_ctrl(ctrl, mode, true);
+		wcd_clsh_set_flyback_current(comp, mode);
+		wcd_clsh_buck_ctrl(ctrl, mode, true);
+	} else {
+		wcd_clsh_buck_ctrl(ctrl, mode, false);
+		wcd_clsh_flyback_ctrl(ctrl, mode, false);
+		wcd_clsh_set_flyback_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_regulator_mode(comp, CLS_H_NORMAL);
+	}
+}
+
+static void wcd_clsh_state_hph_r(struct wcd_clsh_ctrl *ctrl, int req_state,
+				 bool is_enable, int mode)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	if (mode == CLS_H_NORMAL) {
+		dev_err(comp->dev, "%s: Normal mode not applicable for hph_r\n",
+			__func__);
+		return;
+	}
+
+	if (is_enable) {
+		if (mode != CLS_AB) {
+			wcd_enable_clsh_block(ctrl, true);
+			/*
+			 * These K1 values depend on the Headphone Impedance
+			 * For now it is assumed to be 16 ohm
+			 */
+			snd_soc_component_update_bits(comp,
+					WCD9XXX_A_CDC_CLSH_K1_MSB,
+					WCD9XXX_A_CDC_CLSH_K1_MSB_COEF_MASK,
+					0x00);
+			snd_soc_component_update_bits(comp,
+					WCD9XXX_A_CDC_CLSH_K1_LSB,
+					WCD9XXX_A_CDC_CLSH_K1_LSB_COEF_MASK,
+					0xC0);
+			snd_soc_component_update_bits(comp,
+					    WCD9XXX_A_CDC_RX2_RX_PATH_CFG0,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_ENABLE);
+		}
+		wcd_clsh_set_buck_regulator_mode(comp, mode);
+		wcd_clsh_set_flyback_mode(comp, mode);
+		wcd_clsh_flyback_ctrl(ctrl, mode, true);
+		wcd_clsh_set_flyback_current(comp, mode);
+		wcd_clsh_set_buck_mode(comp, mode);
+		wcd_clsh_buck_ctrl(ctrl, mode, true);
+		wcd_clsh_set_hph_mode(comp, mode);
+		wcd_clsh_set_gain_path(ctrl, mode);
+	} else {
+		wcd_clsh_set_hph_mode(comp, CLS_H_NORMAL);
+
+		if (mode != CLS_AB) {
+			snd_soc_component_update_bits(comp,
+					    WCD9XXX_A_CDC_RX2_RX_PATH_CFG0,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_DISABLE);
+			wcd_enable_clsh_block(ctrl, false);
+		}
+		/* buck and flyback set to default mode and disable */
+		wcd_clsh_buck_ctrl(ctrl, CLS_H_NORMAL, false);
+		wcd_clsh_flyback_ctrl(ctrl, CLS_H_NORMAL, false);
+		wcd_clsh_set_flyback_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_regulator_mode(comp, CLS_H_NORMAL);
+	}
+}
+
+static void wcd_clsh_state_hph_l(struct wcd_clsh_ctrl *ctrl, int req_state,
+				 bool is_enable, int mode)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	if (mode == CLS_H_NORMAL) {
+		dev_err(comp->dev, "%s: Normal mode not applicable for hph_l\n",
+			__func__);
+		return;
+	}
+
+	if (is_enable) {
+		if (mode != CLS_AB) {
+			wcd_enable_clsh_block(ctrl, true);
+			/*
+			 * These K1 values depend on the Headphone Impedance
+			 * For now it is assumed to be 16 ohm
+			 */
+			snd_soc_component_update_bits(comp,
+					WCD9XXX_A_CDC_CLSH_K1_MSB,
+					WCD9XXX_A_CDC_CLSH_K1_MSB_COEF_MASK,
+					0x00);
+			snd_soc_component_update_bits(comp,
+					WCD9XXX_A_CDC_CLSH_K1_LSB,
+					WCD9XXX_A_CDC_CLSH_K1_LSB_COEF_MASK,
+					0xC0);
+			snd_soc_component_update_bits(comp,
+					    WCD9XXX_A_CDC_RX1_RX_PATH_CFG0,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_ENABLE);
+		}
+		wcd_clsh_set_buck_regulator_mode(comp, mode);
+		wcd_clsh_set_flyback_mode(comp, mode);
+		wcd_clsh_flyback_ctrl(ctrl, mode, true);
+		wcd_clsh_set_flyback_current(comp, mode);
+		wcd_clsh_set_buck_mode(comp, mode);
+		wcd_clsh_buck_ctrl(ctrl, mode, true);
+		wcd_clsh_set_hph_mode(comp, mode);
+		wcd_clsh_set_gain_path(ctrl, mode);
+	} else {
+		wcd_clsh_set_hph_mode(comp, CLS_H_NORMAL);
+
+		if (mode != CLS_AB) {
+			snd_soc_component_update_bits(comp,
+					    WCD9XXX_A_CDC_RX1_RX_PATH_CFG0,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK,
+					    WCD9XXX_A_CDC_RX_PATH_CLSH_DISABLE);
+			wcd_enable_clsh_block(ctrl, false);
+		}
+		/* set buck and flyback to Default Mode */
+		wcd_clsh_buck_ctrl(ctrl, CLS_H_NORMAL, false);
+		wcd_clsh_flyback_ctrl(ctrl, CLS_H_NORMAL, false);
+		wcd_clsh_set_flyback_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_regulator_mode(comp, CLS_H_NORMAL);
+	}
+}
+
+static void wcd_clsh_state_ear(struct wcd_clsh_ctrl *ctrl, int req_state,
+			       bool is_enable, int mode)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	if (mode != CLS_H_NORMAL) {
+		dev_err(comp->dev, "%s: mode: %d cannot be used for EAR\n",
+			__func__, mode);
+		return;
+	}
+
+	if (is_enable) {
+		wcd_enable_clsh_block(ctrl, true);
+		snd_soc_component_update_bits(comp,
+					WCD9XXX_A_CDC_RX0_RX_PATH_CFG0,
+					WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK,
+					WCD9XXX_A_CDC_RX_PATH_CLSH_ENABLE);
+		wcd_clsh_set_buck_mode(comp, mode);
+		wcd_clsh_set_flyback_mode(comp, mode);
+		wcd_clsh_flyback_ctrl(ctrl, mode, true);
+		wcd_clsh_set_flyback_current(comp, mode);
+		wcd_clsh_buck_ctrl(ctrl, mode, true);
+	} else {
+		snd_soc_component_update_bits(comp,
+					WCD9XXX_A_CDC_RX0_RX_PATH_CFG0,
+					WCD9XXX_A_CDC_RX_PATH_CLSH_EN_MASK,
+					WCD9XXX_A_CDC_RX_PATH_CLSH_DISABLE);
+		wcd_enable_clsh_block(ctrl, false);
+		wcd_clsh_buck_ctrl(ctrl, mode, false);
+		wcd_clsh_flyback_ctrl(ctrl, mode, false);
+		wcd_clsh_set_flyback_mode(comp, CLS_H_NORMAL);
+		wcd_clsh_set_buck_mode(comp, CLS_H_NORMAL);
+	}
+}
+
+static int _wcd_clsh_ctrl_set_state(struct wcd_clsh_ctrl *ctrl, int req_state,
+				    bool is_enable, int mode)
+{
+	switch (req_state) {
+	case WCD_CLSH_STATE_EAR:
+		wcd_clsh_state_ear(ctrl, req_state, is_enable, mode);
+		break;
+	case WCD_CLSH_STATE_HPHL:
+		wcd_clsh_state_hph_l(ctrl, req_state, is_enable, mode);
+		break;
+	case WCD_CLSH_STATE_HPHR:
+		wcd_clsh_state_hph_r(ctrl, req_state, is_enable, mode);
+		break;
+		break;
+	case WCD_CLSH_STATE_LO:
+		wcd_clsh_state_lo(ctrl, req_state, is_enable, mode);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+/*
+ * Function: wcd_clsh_is_state_valid
+ * Params: state
+ * Description:
+ * Provides information on valid states of Class H configuration
+ */
+static bool wcd_clsh_is_state_valid(int state)
+{
+	switch (state) {
+	case WCD_CLSH_STATE_IDLE:
+	case WCD_CLSH_STATE_EAR:
+	case WCD_CLSH_STATE_HPHL:
+	case WCD_CLSH_STATE_HPHR:
+	case WCD_CLSH_STATE_LO:
+		return true;
+	default:
+		return false;
+	};
+}
+
+/*
+ * Function: wcd_clsh_fsm
+ * Params: ctrl, req_state, req_type, clsh_event
+ * Description:
+ * This function handles PRE DAC and POST DAC conditions of different devices
+ * and updates class H configuration of different combination of devices
+ * based on validity of their states. ctrl will contain current
+ * class h state information
+ */
+int wcd_clsh_ctrl_set_state(struct wcd_clsh_ctrl *ctrl,
+			    enum wcd_clsh_event clsh_event,
+			    int nstate,
+			    enum wcd_clsh_mode mode)
+{
+	struct snd_soc_component *comp = ctrl->comp;
+
+	if (nstate == ctrl->state)
+		return 0;
+
+	if (!wcd_clsh_is_state_valid(nstate)) {
+		dev_err(comp->dev, "Class-H not a valid new state:\n");
+		return -EINVAL;
+	}
+
+	switch (clsh_event) {
+	case WCD_CLSH_EVENT_PRE_DAC:
+		_wcd_clsh_ctrl_set_state(ctrl, nstate, CLSH_REQ_ENABLE, mode);
+		break;
+	case WCD_CLSH_EVENT_POST_PA:
+		_wcd_clsh_ctrl_set_state(ctrl, nstate, CLSH_REQ_DISABLE, mode);
+		break;
+	};
+
+	ctrl->state = nstate;
+	ctrl->mode = mode;
+
+	return 0;
+}
+
+int wcd_clsh_ctrl_get_state(struct wcd_clsh_ctrl *ctrl)
+{
+	return ctrl->state;
+}
+
+struct wcd_clsh_ctrl *wcd_clsh_ctrl_alloc(struct snd_soc_component *comp,
+					  int version)
+{
+	struct wcd_clsh_ctrl *ctrl;
+
+	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+	if (!ctrl)
+		return ERR_PTR(-ENOMEM);
+
+	ctrl->state = WCD_CLSH_STATE_IDLE;
+	ctrl->comp = comp;
+
+	return ctrl;
+}
+
+void wcd_clsh_ctrl_free(struct wcd_clsh_ctrl *ctrl)
+{
+	kfree(ctrl);
+}