text: // 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;
  	struct regulator_dev *rdev;
  	bool present;
  	bool output_disable;
  };
  
  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;
  
  	if (info->output_disable) {
  		val->intval = 0;
  		return 0;
  	}
  
  	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;
  
  	if (val == 0) {
  		info->output_disable = true;
  		regulator_disable_regmap(info->rdev);
  		return 0;
  	}
  
  	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;
  
  	info->output_disable = false;
  
  	if (info->rdev && info->rdev->use_count &&
  	    !regulator_is_enabled_regmap(info->rdev))
  		regulator_enable_regmap(info->rdev);
  
  	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 int ucs1002_regulator_enable(struct regulator_dev *rdev)
  {
  	struct ucs1002_info *info = rdev_get_drvdata(rdev);
  
  	/*
  	 * If the output is disabled due to 0 maximum current, just pretend the
  	 * enable did work. The regulator will be enabled as soon as we get a
  	 * a non-zero maximum current budget.
  	 */
  	if (info->output_disable)
  		return 0;
  
  	return regulator_enable_regmap(rdev);
  }
  
  static const struct regulator_ops ucs1002_regulator_ops = {
  	.is_enabled	= regulator_is_enabled_regmap,
  	.enable		= ucs1002_regulator_enable,
  	.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 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->regmap);
  	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;
  	regulator_config.driver_data = info;
  
  	info->rdev = devm_regulator_register(dev, info->regulator_descriptor,
  				       &regulator_config);
  	ret = PTR_ERR_OR_ZERO(info->rdev);
  	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");
  