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@collabora.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

3 files changed, 656 insertions, 0 deletions

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 4728a218656f..fb813b14d55d 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -671,4 +671,13 @@ 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 39fc3e91e619..70a833863c61 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -88,3 +88,4 @@ 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..d66b4eff9b7a
--- /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 < 0 || 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@collabora.com>");
+MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
+MODULE_LICENSE("GPL");