Initial import

1 files changed, 738 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-rt8973a.c b/drivers/extcon/extcon-rt8973a.c
new file mode 100644
index 000000000..9ccd5af89
--- /dev/null
+++ b/drivers/extcon/extcon-rt8973a.c
@@ -0,0 +1,738 @@
+/*
+ * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd
+ * Author: Chanwoo Choi <cw00.choi@samsung.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/extcon.h>
+
+#include "extcon-rt8973a.h"
+
+#define	DELAY_MS_DEFAULT		20000	/* unit: millisecond */
+
+struct muic_irq {
+	unsigned int irq;
+	const char *name;
+	unsigned int virq;
+};
+
+struct reg_data {
+	u8 reg;
+	u8 mask;
+	u8 val;
+	bool invert;
+};
+
+struct rt8973a_muic_info {
+	struct device *dev;
+	struct extcon_dev *edev;
+
+	struct i2c_client *i2c;
+	struct regmap *regmap;
+
+	struct regmap_irq_chip_data *irq_data;
+	struct muic_irq *muic_irqs;
+	unsigned int num_muic_irqs;
+	int irq;
+	bool irq_attach;
+	bool irq_detach;
+	bool irq_ovp;
+	bool irq_otp;
+	struct work_struct irq_work;
+
+	struct reg_data *reg_data;
+	unsigned int num_reg_data;
+	bool auto_config;
+
+	struct mutex mutex;
+
+	/*
+	 * Use delayed workqueue to detect cable state and then
+	 * notify cable state to notifiee/platform through uevent.
+	 * After completing the booting of platform, the extcon provider
+	 * driver should notify cable state to upper layer.
+	 */
+	struct delayed_work wq_detcable;
+};
+
+/* Default value of RT8973A register to bring up MUIC device. */
+static struct reg_data rt8973a_reg_data[] = {
+	{
+		.reg = RT8973A_REG_CONTROL1,
+		.mask = RT8973A_REG_CONTROL1_ADC_EN_MASK
+			| RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
+			| RT8973A_REG_CONTROL1_CHGTYP_MASK
+			| RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK
+			| RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK
+			| RT8973A_REG_CONTROL1_INTM_MASK,
+		.val = RT8973A_REG_CONTROL1_ADC_EN_MASK
+			| RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
+			| RT8973A_REG_CONTROL1_CHGTYP_MASK,
+		.invert = false,
+	},
+	{ /* sentinel */ }
+};
+
+/* List of detectable cables */
+enum {
+	EXTCON_CABLE_USB = 0,
+	EXTCON_CABLE_USB_HOST,
+	EXTCON_CABLE_TA,
+	EXTCON_CABLE_JIG_OFF_USB,
+	EXTCON_CABLE_JIG_ON_USB,
+	EXTCON_CABLE_JIG_OFF_UART,
+	EXTCON_CABLE_JIG_ON_UART,
+
+	EXTCON_CABLE_END,
+};
+
+static const char *rt8973a_extcon_cable[] = {
+	[EXTCON_CABLE_USB]		= "USB",
+	[EXTCON_CABLE_USB_HOST]		= "USB-Host",
+	[EXTCON_CABLE_TA]		= "TA",
+	[EXTCON_CABLE_JIG_OFF_USB]	= "JIG-USB-OFF",
+	[EXTCON_CABLE_JIG_ON_USB]	= "JIG-USB-ON",
+	[EXTCON_CABLE_JIG_OFF_UART]	= "JIG-UART-OFF",
+	[EXTCON_CABLE_JIG_ON_UART]	= "JIG-UART-ON",
+	NULL,
+};
+
+/* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
+enum rt8973a_event_type {
+	RT8973A_EVENT_ATTACH = 1,
+	RT8973A_EVENT_DETACH,
+	RT8973A_EVENT_OVP,
+	RT8973A_EVENT_OTP,
+};
+
+/* Define supported accessory type */
+enum rt8973a_muic_acc_type {
+	RT8973A_MUIC_ADC_OTG = 0x0,
+	RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
+	RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
+	RT8973A_MUIC_ADC_RESERVED_ACC_1,
+	RT8973A_MUIC_ADC_RESERVED_ACC_2,
+	RT8973A_MUIC_ADC_RESERVED_ACC_3,
+	RT8973A_MUIC_ADC_RESERVED_ACC_4,
+	RT8973A_MUIC_ADC_RESERVED_ACC_5,
+	RT8973A_MUIC_ADC_AUDIO_TYPE2,
+	RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
+	RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
+	RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
+	RT8973A_MUIC_ADC_TA,
+	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
+	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
+	RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
+	RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
+	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
+	RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
+	RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
+	RT8973A_MUIC_ADC_OPEN = 0x1f,
+
+	/* The below accessories has same ADC value (0x1f).
+	   So, Device type1 is used to separate specific accessory. */
+					/* |---------|--ADC| */
+					/* |    [7:5]|[4:0]| */
+	RT8973A_MUIC_ADC_USB = 0x3f,	/* |      001|11111| */
+};
+
+/* List of supported interrupt for RT8973A */
+static struct muic_irq rt8973a_muic_irqs[] = {
+	{ RT8973A_INT1_ATTACH,		"muic-attach" },
+	{ RT8973A_INT1_DETACH,		"muic-detach" },
+	{ RT8973A_INT1_CHGDET,		"muic-chgdet" },
+	{ RT8973A_INT1_DCD_T,		"muic-dcd-t" },
+	{ RT8973A_INT1_OVP,		"muic-ovp" },
+	{ RT8973A_INT1_CONNECT,		"muic-connect" },
+	{ RT8973A_INT1_ADC_CHG,		"muic-adc-chg" },
+	{ RT8973A_INT1_OTP,		"muic-otp" },
+	{ RT8973A_INT2_UVLO,		"muic-uvlo" },
+	{ RT8973A_INT2_POR,		"muic-por" },
+	{ RT8973A_INT2_OTP_FET,		"muic-otp-fet" },
+	{ RT8973A_INT2_OVP_FET,		"muic-ovp-fet" },
+	{ RT8973A_INT2_OCP_LATCH,	"muic-ocp-latch" },
+	{ RT8973A_INT2_OCP,		"muic-ocp" },
+	{ RT8973A_INT2_OVP_OCP,		"muic-ovp-ocp" },
+};
+
+/* Define interrupt list of RT8973A to register regmap_irq */
+static const struct regmap_irq rt8973a_irqs[] = {
+	/* INT1 interrupts */
+	{ .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
+	{ .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
+
+	/* INT2 interrupts */
+	{ .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
+	{ .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
+	{ .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
+	{ .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
+	{ .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
+	{ .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
+	{ .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
+};
+
+static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
+	.name			= "rt8973a",
+	.status_base		= RT8973A_REG_INT1,
+	.mask_base		= RT8973A_REG_INTM1,
+	.mask_invert		= false,
+	.num_regs		= 2,
+	.irqs			= rt8973a_irqs,
+	.num_irqs		= ARRAY_SIZE(rt8973a_irqs),
+};
+
+/* Define regmap configuration of RT8973A for I2C communication  */
+static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case RT8973A_REG_INTM1:
+	case RT8973A_REG_INTM2:
+		return true;
+	default:
+		break;
+	}
+	return false;
+}
+
+static const struct regmap_config rt8973a_muic_regmap_config = {
+	.reg_bits	= 8,
+	.val_bits	= 8,
+	.volatile_reg	= rt8973a_muic_volatile_reg,
+	.max_register	= RT8973A_REG_END,
+};
+
+/* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
+static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
+				unsigned int con_sw, bool attached)
+{
+	int ret;
+
+	/*
+	 * Don't need to set h/w path according to cable type
+	 * if Auto-configuration mode of CONTROL1 register is true.
+	 */
+	if (info->auto_config)
+		return 0;
+
+	if (!attached)
+		con_sw	= DM_DP_SWITCH_UART;
+
+	switch (con_sw) {
+	case DM_DP_SWITCH_OPEN:
+	case DM_DP_SWITCH_USB:
+	case DM_DP_SWITCH_UART:
+		ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
+					RT8973A_REG_MANUAL_SW1_DP_MASK |
+					RT8973A_REG_MANUAL_SW1_DM_MASK,
+					con_sw);
+		if (ret < 0) {
+			dev_err(info->dev,
+				"cannot update DM_CON/DP_CON switch\n");
+			return ret;
+		}
+		break;
+	default:
+		dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
+				con_sw);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
+{
+	unsigned int adc, dev1;
+	int ret, cable_type;
+
+	/* Read ADC value according to external cable or button */
+	ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
+	if (ret) {
+		dev_err(info->dev, "failed to read ADC register\n");
+		return ret;
+	}
+	cable_type = adc & RT8973A_REG_ADC_MASK;
+
+	/* Read Device 1 reigster to identify correct cable type */
+	ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
+	if (ret) {
+		dev_err(info->dev, "failed to read DEV1 register\n");
+		return ret;
+	}
+
+	switch (adc) {
+	case RT8973A_MUIC_ADC_OPEN:
+		if (dev1 & RT8973A_REG_DEV1_USB_MASK)
+			cable_type = RT8973A_MUIC_ADC_USB;
+		else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
+			cable_type = RT8973A_MUIC_ADC_TA;
+		else
+			cable_type = RT8973A_MUIC_ADC_OPEN;
+		break;
+	default:
+		break;
+	}
+
+	return cable_type;
+}
+
+static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
+					enum rt8973a_event_type event)
+{
+	static unsigned int prev_cable_type;
+	const char **cable_names = info->edev->supported_cable;
+	unsigned int con_sw = DM_DP_SWITCH_UART;
+	int ret, idx = 0, cable_type;
+	bool attached = false;
+
+	if (!cable_names)
+		return 0;
+
+	switch (event) {
+	case RT8973A_EVENT_ATTACH:
+		cable_type = rt8973a_muic_get_cable_type(info);
+		attached = true;
+		break;
+	case RT8973A_EVENT_DETACH:
+		cable_type = prev_cable_type;
+		attached = false;
+		break;
+	case RT8973A_EVENT_OVP:
+	case RT8973A_EVENT_OTP:
+		dev_warn(info->dev,
+			"happen Over %s issue. Need to disconnect all cables\n",
+			event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
+		cable_type = prev_cable_type;
+		attached = false;
+		break;
+	default:
+		dev_err(info->dev,
+			"Cannot handle this event (event:%d)\n", event);
+		return -EINVAL;
+	}
+	prev_cable_type = cable_type;
+
+	switch (cable_type) {
+	case RT8973A_MUIC_ADC_OTG:
+		idx = EXTCON_CABLE_USB_HOST;
+		con_sw = DM_DP_SWITCH_USB;
+		break;
+	case RT8973A_MUIC_ADC_TA:
+		idx = EXTCON_CABLE_TA;
+		con_sw = DM_DP_SWITCH_OPEN;
+		break;
+	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
+		idx = EXTCON_CABLE_JIG_OFF_USB;
+		con_sw = DM_DP_SWITCH_UART;
+		break;
+	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
+		idx = EXTCON_CABLE_JIG_ON_USB;
+		con_sw = DM_DP_SWITCH_UART;
+		break;
+	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
+		idx = EXTCON_CABLE_JIG_OFF_UART;
+		con_sw = DM_DP_SWITCH_UART;
+		break;
+	case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
+		idx = EXTCON_CABLE_JIG_ON_UART;
+		con_sw = DM_DP_SWITCH_UART;
+		break;
+	case RT8973A_MUIC_ADC_USB:
+		idx = EXTCON_CABLE_USB;
+		con_sw = DM_DP_SWITCH_USB;
+		break;
+	case RT8973A_MUIC_ADC_OPEN:
+		return 0;
+	case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
+	case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
+	case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
+	case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
+	case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
+		dev_warn(info->dev,
+			"Unknown accessory type (adc:0x%x)\n", cable_type);
+		return 0;
+	case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
+	case RT8973A_MUIC_ADC_AUDIO_TYPE2:
+		dev_warn(info->dev,
+			"Audio device/button type (adc:0x%x)\n", cable_type);
+		return 0;
+	case RT8973A_MUIC_ADC_RESERVED_ACC_1:
+	case RT8973A_MUIC_ADC_RESERVED_ACC_2:
+	case RT8973A_MUIC_ADC_RESERVED_ACC_3:
+	case RT8973A_MUIC_ADC_RESERVED_ACC_4:
+	case RT8973A_MUIC_ADC_RESERVED_ACC_5:
+	case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
+		return 0;
+	default:
+		dev_err(info->dev,
+			"Cannot handle this cable_type (adc:0x%x)\n",
+			cable_type);
+		return -EINVAL;
+	}
+
+	/* Change internal hardware path(DM_CON/DP_CON) */
+	ret = rt8973a_muic_set_path(info, con_sw, attached);
+	if (ret < 0)
+		return ret;
+
+	/* Change the state of external accessory */
+	extcon_set_cable_state(info->edev, cable_names[idx], attached);
+
+	return 0;
+}
+
+static void rt8973a_muic_irq_work(struct work_struct *work)
+{
+	struct rt8973a_muic_info *info = container_of(work,
+			struct rt8973a_muic_info, irq_work);
+	int ret = 0;
+
+	if (!info->edev)
+		return;
+
+	mutex_lock(&info->mutex);
+
+	/* Detect attached or detached cables */
+	if (info->irq_attach) {
+		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
+		info->irq_attach = false;
+	}
+
+	if (info->irq_detach) {
+		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
+		info->irq_detach = false;
+	}
+
+	if (info->irq_ovp) {
+		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
+		info->irq_ovp = false;
+	}
+
+	if (info->irq_otp) {
+		ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
+		info->irq_otp = false;
+	}
+
+	if (ret < 0)
+		dev_err(info->dev, "failed to handle MUIC interrupt\n");
+
+	mutex_unlock(&info->mutex);
+}
+
+static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
+{
+	struct rt8973a_muic_info *info = data;
+	int i, irq_type = -1;
+
+	for (i = 0; i < info->num_muic_irqs; i++)
+		if (irq == info->muic_irqs[i].virq)
+			irq_type = info->muic_irqs[i].irq;
+
+	switch (irq_type) {
+	case RT8973A_INT1_ATTACH:
+		info->irq_attach = true;
+		break;
+	case RT8973A_INT1_DETACH:
+		info->irq_detach = true;
+		break;
+	case RT8973A_INT1_OVP:
+		info->irq_ovp = true;
+		break;
+	case RT8973A_INT1_OTP:
+		info->irq_otp = true;
+		break;
+	case RT8973A_INT1_CHGDET:
+	case RT8973A_INT1_DCD_T:
+	case RT8973A_INT1_CONNECT:
+	case RT8973A_INT1_ADC_CHG:
+	case RT8973A_INT2_UVLO:
+	case RT8973A_INT2_POR:
+	case RT8973A_INT2_OTP_FET:
+	case RT8973A_INT2_OVP_FET:
+	case RT8973A_INT2_OCP_LATCH:
+	case RT8973A_INT2_OCP:
+	case RT8973A_INT2_OVP_OCP:
+	default:
+		dev_dbg(info->dev,
+			"Cannot handle this interrupt (%d)\n", irq_type);
+		break;
+	}
+
+	schedule_work(&info->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
+{
+	struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
+				struct rt8973a_muic_info, wq_detcable);
+	int ret;
+
+	/* Notify the state of connector cable or not  */
+	ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
+	if (ret < 0)
+		dev_warn(info->dev, "failed to detect cable state\n");
+}
+
+static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
+{
+	unsigned int data, vendor_id, version_id;
+	int i, ret;
+
+	/* To test I2C, Print version_id and vendor_id of RT8973A */
+	ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
+	if (ret) {
+		dev_err(info->dev,
+			"failed to read DEVICE_ID register: %d\n", ret);
+		return;
+	}
+
+	vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
+				RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
+	version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
+				RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
+
+	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
+			    version_id, vendor_id);
+
+	/* Initiazle the register of RT8973A device to bring-up */
+	for (i = 0; i < info->num_reg_data; i++) {
+		u8 reg = info->reg_data[i].reg;
+		u8 mask = info->reg_data[i].mask;
+		u8 val = 0;
+
+		if (info->reg_data[i].invert)
+			val = ~info->reg_data[i].val;
+		else
+			val = info->reg_data[i].val;
+
+		regmap_update_bits(info->regmap, reg, mask, val);
+	}
+
+	/* Check whether RT8973A is auto swithcing mode or not */
+	ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
+	if (ret) {
+		dev_err(info->dev,
+			"failed to read CONTROL1 register: %d\n", ret);
+		return;
+	}
+
+	data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
+	if (data) {
+		info->auto_config = true;
+		dev_info(info->dev,
+			"Enable Auto-configuration for internal path\n");
+	}
+}
+
+static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
+				 const struct i2c_device_id *id)
+{
+	struct device_node *np = i2c->dev.of_node;
+	struct rt8973a_muic_info *info;
+	int i, ret, irq_flags;
+
+	if (!np)
+		return -EINVAL;
+
+	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+	i2c_set_clientdata(i2c, info);
+
+	info->dev = &i2c->dev;
+	info->i2c = i2c;
+	info->irq = i2c->irq;
+	info->muic_irqs = rt8973a_muic_irqs;
+	info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
+	info->reg_data = rt8973a_reg_data;
+	info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
+
+	mutex_init(&info->mutex);
+
+	INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
+
+	info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
+	if (IS_ERR(info->regmap)) {
+		ret = PTR_ERR(info->regmap);
+		dev_err(info->dev, "failed to allocate register map: %d\n",
+				   ret);
+		return ret;
+	}
+
+	/* Support irq domain for RT8973A MUIC device */
+	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
+	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
+				  &rt8973a_muic_irq_chip, &info->irq_data);
+	if (ret != 0) {
+		dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
+				    info->irq, ret);
+		return ret;
+	}
+
+	for (i = 0; i < info->num_muic_irqs; i++) {
+		struct muic_irq *muic_irq = &info->muic_irqs[i];
+		unsigned int virq = 0;
+
+		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
+		if (virq <= 0)
+			return -EINVAL;
+		muic_irq->virq = virq;
+
+		ret = devm_request_threaded_irq(info->dev, virq, NULL,
+						rt8973a_muic_irq_handler,
+						IRQF_NO_SUSPEND,
+						muic_irq->name, info);
+		if (ret) {
+			dev_err(info->dev,
+				"failed: irq request (IRQ: %d, error :%d)\n",
+				muic_irq->irq, ret);
+			return ret;
+		}
+	}
+
+	/* Allocate extcon device */
+	info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
+	if (IS_ERR(info->edev)) {
+		dev_err(info->dev, "failed to allocate memory for extcon\n");
+		return -ENOMEM;
+	}
+	info->edev->name = np->name;
+
+	/* Register extcon device */
+	ret = devm_extcon_dev_register(info->dev, info->edev);
+	if (ret) {
+		dev_err(info->dev, "failed to register extcon device\n");
+		return ret;
+	}
+
+	/*
+	 * Detect accessory after completing the initialization of platform
+	 *
+	 * - Use delayed workqueue to detect cable state and then
+	 * notify cable state to notifiee/platform through uevent.
+	 * After completing the booting of platform, the extcon provider
+	 * driver should notify cable state to upper layer.
+	 */
+	INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
+	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+			msecs_to_jiffies(DELAY_MS_DEFAULT));
+
+	/* Initialize RT8973A device and print vendor id and version id */
+	rt8973a_init_dev_type(info);
+
+	return 0;
+}
+
+static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
+{
+	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
+
+	regmap_del_irq_chip(info->irq, info->irq_data);
+
+	return 0;
+}
+
+static const struct of_device_id rt8973a_dt_match[] = {
+	{ .compatible = "richtek,rt8973a-muic" },
+	{ },
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int rt8973a_muic_suspend(struct device *dev)
+{
+	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
+
+	enable_irq_wake(info->irq);
+
+	return 0;
+}
+
+static int rt8973a_muic_resume(struct device *dev)
+{
+	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
+
+	disable_irq_wake(info->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
+			 rt8973a_muic_suspend, rt8973a_muic_resume);
+
+static const struct i2c_device_id rt8973a_i2c_id[] = {
+	{ "rt8973a", TYPE_RT8973A },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
+
+static struct i2c_driver rt8973a_muic_i2c_driver = {
+	.driver		= {
+		.name	= "rt8973a",
+		.owner	= THIS_MODULE,
+		.pm	= &rt8973a_muic_pm_ops,
+		.of_match_table = rt8973a_dt_match,
+	},
+	.probe	= rt8973a_muic_i2c_probe,
+	.remove	= rt8973a_muic_i2c_remove,
+	.id_table = rt8973a_i2c_id,
+};
+
+static int __init rt8973a_muic_i2c_init(void)
+{
+	return i2c_add_driver(&rt8973a_muic_i2c_driver);
+}
+subsys_initcall(rt8973a_muic_i2c_init);
+
+MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
+MODULE_LICENSE("GPL");