Date:   Mon, 29 Apr 2019 12:53:48 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-pm@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Enric Balletbo Serra <enric.balletbo@...labora.com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Guenter Roeck <linux@...ck-us.net>,
        Sebastian Reichel <sre@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/3] power: supply: Add driver for Microchip UCS1002

Add driver for Microchip UCS1002 Programmable USB Port Power
Controller with Charger Emulation. The driver exposed a power supply
device to control/monitor various parameter of the device as well as a
regulator to allow controlling VBUS line.

Signed-off-by: Enric Balletbo Serra <enric.balletbo@...labora.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Fabio Estevam <fabio.estevam@....com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Sebastian Reichel <sre@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: linux-pm@...r.kernel.org
---
 drivers/power/supply/Kconfig         |   9 +
 drivers/power/supply/Makefile        |   1 +
 drivers/power/supply/ucs1002_power.c | 646 +++++++++++++++++++++++++++
 3 files changed, 656 insertions(+)
 create mode 100644 drivers/power/supply/ucs1002_power.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index e901b9879e7e..c614c8a196f3 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -660,4 +660,13 @@ config FUEL_GAUGE_SC27XX
 	 Say Y here to enable support for fuel gauge with SC27XX
 	 PMIC chips.
 
+config CHARGER_UCS1002
+        tristate "Microchip UCS1002 USB Port Power Controller"
+	depends on I2C
+	depends on OF
+	select REGMAP_I2C
+	help
+	  Say Y to enable support for Microchip UCS1002 Programmable
+	  USB Port Power Controller with Charger Emulation.
+
 endif # POWER_SUPPLY
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index b731c2a9b695..c56803a9e4fe 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -87,3 +87,4 @@ obj-$(CONFIG_AXP288_CHARGER)	+= axp288_charger.o
 obj-$(CONFIG_CHARGER_CROS_USBPD)	+= cros_usbpd-charger.o
 obj-$(CONFIG_CHARGER_SC2731)	+= sc2731_charger.o
 obj-$(CONFIG_FUEL_GAUGE_SC27XX)	+= sc27xx_fuel_gauge.o
+obj-$(CONFIG_CHARGER_UCS1002)	+= ucs1002_power.o
diff --git a/drivers/power/supply/ucs1002_power.c b/drivers/power/supply/ucs1002_power.c
new file mode 100644
index 000000000000..677f20a4d76f
--- /dev/null
+++ b/drivers/power/supply/ucs1002_power.c
@@ -0,0 +1,646 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for UCS1002 Programmable USB Port Power Controller
+ *
+ * Copyright (C) 2019 Zodiac Inflight Innovations
+ */
+#include <linux/bits.h>
+#include <linux/freezer.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/* UCS1002 Registers */
+#define UCS1002_REG_CURRENT_MEASUREMENT	0x00
+
+/*
+ * The Total Accumulated Charge registers store the total accumulated
+ * charge delivered from the VS source to a portable device. The total
+ * value is calculated using four registers, from 01h to 04h. The bit
+ * weighting of the registers is given in mA/hrs.
+ */
+#define UCS1002_REG_TOTAL_ACC_CHARGE	0x01
+
+/* Other Status Register */
+#define UCS1002_REG_OTHER_STATUS	0x0f
+#  define F_ADET_PIN			BIT(4)
+#  define F_CHG_ACT			BIT(3)
+
+/* Interrupt Status */
+#define UCS1002_REG_INTERRUPT_STATUS	0x10
+#  define F_DISCHARGE_ERR		BIT(6)
+#  define F_RESET			BIT(5)
+#  define F_MIN_KEEP_OUT		BIT(4)
+#  define F_TSD				BIT(3)
+#  define F_OVER_VOLT			BIT(2)
+#  define F_BACK_VOLT			BIT(1)
+#  define F_OVER_ILIM			BIT(0)
+
+/* Pin Status Register */
+#define UCS1002_REG_PIN_STATUS		0x14
+#  define UCS1002_PWR_STATE_MASK	0x03
+#  define F_PWR_EN_PIN			BIT(6)
+#  define F_M2_PIN			BIT(5)
+#  define F_M1_PIN			BIT(4)
+#  define F_EM_EN_PIN			BIT(3)
+#  define F_SEL_PIN			BIT(2)
+#  define F_ACTIVE_MODE_MASK		GENMASK(5, 3)
+#  define F_ACTIVE_MODE_PASSTHROUGH	F_M2_PIN
+#  define F_ACTIVE_MODE_DEDICATED	F_EM_EN_PIN
+#  define F_ACTIVE_MODE_BC12_DCP	(F_M2_PIN | F_EM_EN_PIN)
+#  define F_ACTIVE_MODE_BC12_SDP	F_M1_PIN
+#  define F_ACTIVE_MODE_BC12_CDP	(F_M1_PIN | F_M2_PIN | F_EM_EN_PIN)
+
+/* General Configuration Register */
+#define UCS1002_REG_GENERAL_CFG		0x15
+#  define F_RATION_EN			BIT(3)
+
+/* Emulation Configuration Register */
+#define UCS1002_REG_EMU_CFG		0x16
+
+/* Switch Configuration Register */
+#define UCS1002_REG_SWITCH_CFG		0x17
+#  define F_PIN_IGNORE			BIT(7)
+#  define F_EM_EN_SET			BIT(5)
+#  define F_M2_SET			BIT(4)
+#  define F_M1_SET			BIT(3)
+#  define F_S0_SET			BIT(2)
+#  define F_PWR_EN_SET			BIT(1)
+#  define F_LATCH_SET			BIT(0)
+#  define V_SET_ACTIVE_MODE_MASK	GENMASK(5, 3)
+#  define V_SET_ACTIVE_MODE_PASSTHROUGH	F_M2_SET
+#  define V_SET_ACTIVE_MODE_DEDICATED	F_EM_EN_SET
+#  define V_SET_ACTIVE_MODE_BC12_DCP	(F_M2_SET | F_EM_EN_SET)
+#  define V_SET_ACTIVE_MODE_BC12_SDP	F_M1_SET
+#  define V_SET_ACTIVE_MODE_BC12_CDP	(F_M1_SET | F_M2_SET | F_EM_EN_SET)
+
+/* Current Limit Register */
+#define UCS1002_REG_ILIMIT		0x19
+#  define UCS1002_ILIM_SW_MASK		GENMASK(3, 0)
+
+/* Product ID */
+#define UCS1002_REG_PRODUCT_ID		0xfd
+#  define UCS1002_PRODUCT_ID		0x4e
+
+/* Manufacture name */
+#define UCS1002_MANUFACTURER		"SMSC"
+
+struct ucs1002_info {
+	struct power_supply *charger;
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct regulator_desc *regulator_descriptor;
+	bool present;
+};
+
+static enum power_supply_property ucs1002_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
+	POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */
+	POWER_SUPPLY_PROP_MANUFACTURER,
+	POWER_SUPPLY_PROP_USB_TYPE,
+	POWER_SUPPLY_PROP_HEALTH,
+};
+
+static int ucs1002_get_online(struct ucs1002_info *info,
+			      union power_supply_propval *val)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &reg);
+	if (ret)
+		return ret;
+
+	val->intval = !!(reg & F_CHG_ACT);
+
+	return 0;
+}
+
+static int ucs1002_get_charge(struct ucs1002_info *info,
+			      union power_supply_propval *val)
+{
+	/*
+	 * To fit within 32 bits some values are rounded (uA/h)
+	 *
+	 * For Total Accumulated Charge Middle Low Byte register, addr
+	 * 03h, byte 2
+	 *
+	 *   B0: 0.01084 mA/h rounded to 11 uA/h
+	 *   B1: 0.02169 mA/h rounded to 22 uA/h
+	 *   B2: 0.04340 mA/h rounded to 43 uA/h
+	 *   B3: 0.08676 mA/h rounded to 87 uA/h
+	 *   B4: 0.17350 mA/h rounded to 173 uÁ/h
+	 *
+	 * For Total Accumulated Charge Low Byte register, addr 04h,
+	 * byte 3
+	 *
+	 *   B6: 0.00271 mA/h rounded to 3 uA/h
+	 *   B7: 0.005422 mA/h rounded to 5 uA/h
+	 */
+	static const int bit_weights_uAh[BITS_PER_TYPE(u32)] = {
+		/*
+		 * Bit corresponding to low byte (offset 0x04)
+		 * B0 B1 B2 B3 B4 B5 B6 B7
+		 */
+		0, 0, 0, 0, 0, 0, 3, 5,
+		/*
+		 * Bit corresponding to middle low byte (offset 0x03)
+		 * B0 B1 B2 B3 B4 B5 B6 B7
+		 */
+		11, 22, 43, 87, 173, 347, 694, 1388,
+		/*
+		 * Bit corresponding to middle high byte (offset 0x02)
+		 * B0 B1 B2 B3 B4 B5 B6 B7
+		 */
+		2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400,
+		/*
+		 * Bit corresponding to high byte (offset 0x01)
+		 * B0 B1 B2 B3 B4 B5 B6 B7
+		 */
+		710700, 1421000, 2843000, 5685000, 11371000, 22742000,
+		45484000, 90968000,
+	};
+	unsigned long total_acc_charger;
+	unsigned int reg;
+	int i, ret;
+
+	ret = regmap_bulk_read(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE,
+			       &reg, sizeof(u32));
+	if (ret)
+		return ret;
+
+	total_acc_charger = be32_to_cpu(reg); /* BE as per offsets above */
+	val->intval = 0;
+
+	for_each_set_bit(i, &total_acc_charger, ARRAY_SIZE(bit_weights_uAh))
+		val->intval += bit_weights_uAh[i];
+
+	return 0;
+}
+
+static int ucs1002_get_current(struct ucs1002_info *info,
+			       union power_supply_propval *val)
+{
+	/*
+	 * The Current Measurement register stores the measured
+	 * current value delivered to the portable device. The range
+	 * is from 9.76 mA to 2.5 A.
+	 */
+	static const int bit_weights_uA[BITS_PER_TYPE(u8)] = {
+		9760, 19500, 39000, 78100, 156200, 312300, 624600, 1249300,
+	};
+	unsigned long current_measurement;
+	unsigned int reg;
+	int i, ret;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, &reg);
+	if (ret)
+		return ret;
+
+	current_measurement = reg;
+	val->intval = 0;
+
+	for_each_set_bit(i, &current_measurement, ARRAY_SIZE(bit_weights_uA))
+		val->intval += bit_weights_uA[i];
+
+	return 0;
+}
+
+/*
+ * The Current Limit register stores the maximum current used by the
+ * port switch. The range is from 500mA to 2.5 A.
+ */
+static const u32 ucs1002_current_limit_uA[] = {
+	500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000,
+};
+
+static int ucs1002_get_max_current(struct ucs1002_info *info,
+				   union power_supply_propval *val)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
+	if (ret)
+		return ret;
+
+	val->intval = ucs1002_current_limit_uA[reg & UCS1002_ILIM_SW_MASK];
+
+	return 0;
+}
+
+static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val)
+{
+	unsigned int reg;
+	int ret, idx;
+
+	for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) {
+		if (val == ucs1002_current_limit_uA[idx])
+			break;
+	}
+
+	if (idx == ARRAY_SIZE(ucs1002_current_limit_uA))
+		return -EINVAL;
+
+	ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, idx);
+	if (ret)
+		return ret;
+	/*
+	 * Any current limit setting exceeding the one set via ILIM
+	 * pin will be rejected, so we read out freshly changed limit
+	 * to make sure that it took effect.
+	 */
+	ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
+	if (ret)
+		return ret;
+
+	if (reg != idx)
+		return -EINVAL;
+
+	return 0;
+}
+
+static enum power_supply_usb_type ucs1002_usb_types[] = {
+	POWER_SUPPLY_USB_TYPE_PD,
+	POWER_SUPPLY_USB_TYPE_SDP,
+	POWER_SUPPLY_USB_TYPE_DCP,
+	POWER_SUPPLY_USB_TYPE_CDP,
+	POWER_SUPPLY_USB_TYPE_UNKNOWN,
+};
+
+static int ucs1002_set_usb_type(struct ucs1002_info *info, int val)
+{
+	unsigned int mode;
+
+	if (val >= ARRAY_SIZE(ucs1002_usb_types))
+		return -EINVAL;
+
+	switch (ucs1002_usb_types[val]) {
+	case POWER_SUPPLY_USB_TYPE_PD:
+		mode = V_SET_ACTIVE_MODE_DEDICATED;
+		break;
+	case POWER_SUPPLY_USB_TYPE_SDP:
+		mode = V_SET_ACTIVE_MODE_BC12_SDP;
+		break;
+	case POWER_SUPPLY_USB_TYPE_DCP:
+		mode = V_SET_ACTIVE_MODE_BC12_DCP;
+		break;
+	case POWER_SUPPLY_USB_TYPE_CDP:
+		mode = V_SET_ACTIVE_MODE_BC12_CDP;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
+				  V_SET_ACTIVE_MODE_MASK, mode);
+}
+
+static int ucs1002_get_usb_type(struct ucs1002_info *info,
+				union power_supply_propval *val)
+{
+	enum power_supply_usb_type type;
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &reg);
+	if (ret)
+		return ret;
+
+	switch (reg & F_ACTIVE_MODE_MASK) {
+	default:
+		type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+		break;
+	case F_ACTIVE_MODE_DEDICATED:
+		type = POWER_SUPPLY_USB_TYPE_PD;
+		break;
+	case F_ACTIVE_MODE_BC12_SDP:
+		type = POWER_SUPPLY_USB_TYPE_SDP;
+		break;
+	case F_ACTIVE_MODE_BC12_DCP:
+		type = POWER_SUPPLY_USB_TYPE_DCP;
+		break;
+	case F_ACTIVE_MODE_BC12_CDP:
+		type = POWER_SUPPLY_USB_TYPE_CDP;
+		break;
+	};
+
+	val->intval = type;
+
+	return 0;
+}
+
+static int ucs1002_get_health(struct ucs1002_info *info,
+			      union power_supply_propval *val)
+{
+	unsigned int reg;
+	int ret, health;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, &reg);
+	if (ret)
+		return ret;
+
+	if (reg & F_TSD)
+		health = POWER_SUPPLY_HEALTH_OVERHEAT;
+	else if (reg & (F_OVER_VOLT | F_BACK_VOLT))
+		health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+	else if (reg & F_OVER_ILIM)
+		health = POWER_SUPPLY_HEALTH_OVERCURRENT;
+	else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT))
+		health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+	else
+		health = POWER_SUPPLY_HEALTH_GOOD;
+
+	val->intval = health;
+
+	return 0;
+}
+
+static int ucs1002_get_property(struct power_supply *psy,
+				enum power_supply_property psp,
+				union power_supply_propval *val)
+{
+	struct ucs1002_info *info = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		return ucs1002_get_online(info, val);
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+		return ucs1002_get_charge(info, val);
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		return ucs1002_get_current(info, val);
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		return ucs1002_get_max_current(info, val);
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		return ucs1002_get_usb_type(info, val);
+	case POWER_SUPPLY_PROP_HEALTH:
+		return ucs1002_get_health(info, val);
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = info->present;
+		return 0;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		val->strval = UCS1002_MANUFACTURER;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ucs1002_set_property(struct power_supply *psy,
+				enum power_supply_property psp,
+				const union power_supply_propval *val)
+{
+	struct ucs1002_info *info = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		return ucs1002_set_max_current(info, val->intval);
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		return ucs1002_set_usb_type(info, val->intval);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ucs1002_property_is_writeable(struct power_supply *psy,
+					 enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct power_supply_desc ucs1002_charger_desc = {
+	.name			= "ucs1002",
+	.type			= POWER_SUPPLY_TYPE_USB,
+	.usb_types		= ucs1002_usb_types,
+	.num_usb_types		= ARRAY_SIZE(ucs1002_usb_types),
+	.get_property		= ucs1002_get_property,
+	.set_property		= ucs1002_set_property,
+	.property_is_writeable	= ucs1002_property_is_writeable,
+	.properties		= ucs1002_props,
+	.num_properties		= ARRAY_SIZE(ucs1002_props),
+};
+
+static irqreturn_t ucs1002_charger_irq(int irq, void *data)
+{
+	int ret, regval;
+	bool present;
+	struct ucs1002_info *info = data;
+
+	present = info->present;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &regval);
+	if (ret)
+		return IRQ_HANDLED;
+
+	/* update attached status */
+	info->present = regval & F_ADET_PIN;
+
+	/* notify the change */
+	if (present != info->present)
+		power_supply_changed(info->charger);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ucs1002_alert_irq(int irq, void *data)
+{
+	struct ucs1002_info *info = data;
+
+	power_supply_changed(info->charger);
+
+	return IRQ_HANDLED;
+}
+
+static const struct regulator_ops ucs1002_regulator_ops = {
+	.is_enabled	= regulator_is_enabled_regmap,
+	.enable		= regulator_enable_regmap,
+	.disable	= regulator_disable_regmap,
+};
+
+static const struct regulator_desc ucs1002_regulator_descriptor = {
+	.name		= "ucs1002-vbus",
+	.ops		= &ucs1002_regulator_ops,
+	.type		= REGULATOR_VOLTAGE,
+	.owner		= THIS_MODULE,
+	.enable_reg	= UCS1002_REG_SWITCH_CFG,
+	.enable_mask	= F_PWR_EN_SET,
+	.enable_val	= F_PWR_EN_SET,
+	.fixed_uV	= 5000000,
+	.n_voltages	= 1,
+};
+
+static int ucs1002_probe(struct i2c_client *client,
+			 const struct i2c_device_id *dev_id)
+{
+	struct device *dev = &client->dev;
+	struct power_supply_config charger_config = {};
+	const struct regmap_config regmap_config = {
+		.reg_bits = 8,
+		.val_bits = 8,
+	};
+	struct regulator_config regulator_config = {};
+	int irq_a_det, irq_alert, ret;
+	struct regulator_dev *rdev;
+	struct ucs1002_info *info;
+	unsigned int regval;
+
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->regmap = devm_regmap_init_i2c(client, &regmap_config);
+	ret = PTR_ERR_OR_ZERO(info->charger);
+	if (ret) {
+		dev_err(dev, "Regmap initialization failed: %d\n", ret);
+		return ret;
+	}
+
+	info->client = client;
+
+	irq_a_det = of_irq_get_byname(dev->of_node, "a_det");
+	irq_alert = of_irq_get_byname(dev->of_node, "alert");
+
+	charger_config.of_node = dev->of_node;
+	charger_config.drv_data = info;
+
+	ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, &regval);
+	if (ret) {
+		dev_err(dev, "Failed to read product ID: %d\n", ret);
+		return ret;
+	}
+
+	if (regval != UCS1002_PRODUCT_ID) {
+		dev_err(dev,
+			"Product ID does not match (0x%02x != 0x%02x)\n",
+			regval, UCS1002_PRODUCT_ID);
+		return -ENODEV;
+	}
+
+	/* Enable charge rationing by default */
+	ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG,
+				 F_RATION_EN, F_RATION_EN);
+	if (ret) {
+		dev_err(dev, "Failed to read general config: %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active
+	 * mode selection to BC1.2 CDP.
+	 */
+	ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
+				 V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE,
+				 V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE);
+	if (ret) {
+		dev_err(dev, "Failed to configure default mode: %d\n", ret);
+		return ret;
+	}
+	/*
+	 * Be safe and set initial current limit to 500mA
+	 */
+	ret = ucs1002_set_max_current(info, 500000);
+	if (ret) {
+		dev_err(dev, "Failed to set max current default: %d\n", ret);
+		return ret;
+	}
+
+	info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc,
+						   &charger_config);
+	ret = PTR_ERR_OR_ZERO(info->charger);
+	if (ret) {
+		dev_err(dev, "Failed to register power supply: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &regval);
+	if (ret) {
+		dev_err(dev, "Failed to read pin status: %d\n", ret);
+		return ret;
+	}
+
+	info->regulator_descriptor =
+		devm_kmemdup(dev, &ucs1002_regulator_descriptor,
+			     sizeof(ucs1002_regulator_descriptor),
+			     GFP_KERNEL);
+	if (!info->regulator_descriptor)
+		return -ENOMEM;
+
+	info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN);
+
+	regulator_config.dev = dev;
+	regulator_config.of_node = dev->of_node;
+	regulator_config.regmap = info->regmap;
+
+	rdev = devm_regulator_register(dev, info->regulator_descriptor,
+				       &regulator_config);
+	ret = PTR_ERR_OR_ZERO(info->charger);
+	if (ret) {
+		dev_err(dev, "Failed to register VBUS regulator: %d\n", ret);
+		return ret;
+	}
+
+	if (irq_a_det > 0) {
+		ret = devm_request_threaded_irq(dev, irq_a_det, NULL,
+						ucs1002_charger_irq,
+						IRQF_ONESHOT,
+						"ucs1002-a_det", info);
+		if (ret) {
+			dev_err(dev, "Failed to request A_DET threaded irq: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	if (irq_alert > 0) {
+		ret = devm_request_threaded_irq(dev, irq_alert, NULL,
+						ucs1002_alert_irq,
+						IRQF_ONESHOT,
+						"ucs1002-alert", info);
+		if (ret) {
+			dev_err(dev, "Failed to request ALERT threaded irq: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct of_device_id ucs1002_of_match[] = {
+	{ .compatible = "microchip,ucs1002", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ucs1002_of_match);
+
+static struct i2c_driver ucs1002_driver = {
+	.driver = {
+		   .name = "ucs1002",
+		   .of_match_table = ucs1002_of_match,
+	},
+	.probe = ucs1002_probe,
+};
+module_i2c_driver(ucs1002_driver);
+
+MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller");
+MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@...labora.com>");
+MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@...il.com>");
+MODULE_LICENSE("GPL");
-- 
2.20.1

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