/*
   * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
   *
   * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
   *
   * based on twl4030_bci_battery.c by TI
   * Copyright (C) 2008 Texas Instruments, Inc.
   *
   * 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/init.h>
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/err.h>
  #include <linux/platform_device.h>
  #include <linux/interrupt.h>
  #include <linux/i2c/twl.h>
  #include <linux/power_supply.h>
  #include <linux/notifier.h>
  #include <linux/usb/otg.h>
  #include <linux/regulator/machine.h>
  
  #define TWL4030_BCIMSTATEC	0x02
  #define TWL4030_BCIICHG		0x08
  #define TWL4030_BCIVAC		0x0a
  #define TWL4030_BCIVBUS		0x0c
  #define TWL4030_BCIMFSTS4	0x10
  #define TWL4030_BCICTL1		0x23
  #define TWL4030_BB_CFG		0x12
  
  #define TWL4030_BCIAUTOWEN	BIT(5)
  #define TWL4030_CONFIG_DONE	BIT(4)
  #define TWL4030_BCIAUTOUSB	BIT(1)
  #define TWL4030_BCIAUTOAC	BIT(0)
  #define TWL4030_CGAIN		BIT(5)
  #define TWL4030_USBFASTMCHG	BIT(2)
  #define TWL4030_STS_VBUS	BIT(7)
  #define TWL4030_STS_USB_ID	BIT(2)
  #define TWL4030_BBCHEN		BIT(4)
  #define TWL4030_BBSEL_MASK	0x0c
  #define TWL4030_BBSEL_2V5	0x00
  #define TWL4030_BBSEL_3V0	0x04
  #define TWL4030_BBSEL_3V1	0x08
  #define TWL4030_BBSEL_3V2	0x0c
  #define TWL4030_BBISEL_MASK	0x03
  #define TWL4030_BBISEL_25uA	0x00
  #define TWL4030_BBISEL_150uA	0x01
  #define TWL4030_BBISEL_500uA	0x02
  #define TWL4030_BBISEL_1000uA	0x03
  
  /* BCI interrupts */
  #define TWL4030_WOVF		BIT(0) /* Watchdog overflow */
  #define TWL4030_TMOVF		BIT(1) /* Timer overflow */
  #define TWL4030_ICHGHIGH	BIT(2) /* Battery charge current high */
  #define TWL4030_ICHGLOW		BIT(3) /* Battery cc. low / FSM state change */
  #define TWL4030_ICHGEOC		BIT(4) /* Battery current end-of-charge */
  #define TWL4030_TBATOR2		BIT(5) /* Battery temperature out of range 2 */
  #define TWL4030_TBATOR1		BIT(6) /* Battery temperature out of range 1 */
  #define TWL4030_BATSTS		BIT(7) /* Battery status */
  
  #define TWL4030_VBATLVL		BIT(0) /* VBAT level */
  #define TWL4030_VBATOV		BIT(1) /* VBAT overvoltage */
  #define TWL4030_VBUSOV		BIT(2) /* VBUS overvoltage */
  #define TWL4030_ACCHGOV		BIT(3) /* Ac charger overvoltage */
  
  #define TWL4030_MSTATEC_USB		BIT(4)
  #define TWL4030_MSTATEC_AC		BIT(5)
  #define TWL4030_MSTATEC_MASK		0x0f
  #define TWL4030_MSTATEC_QUICK1		0x02
  #define TWL4030_MSTATEC_QUICK7		0x07
  #define TWL4030_MSTATEC_COMPLETE1	0x0b
  #define TWL4030_MSTATEC_COMPLETE4	0x0e
  
  static bool allow_usb;
  module_param(allow_usb, bool, 0644);
  MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  
  struct twl4030_bci {
  	struct device		*dev;
  	struct power_supply	ac;
  	struct power_supply	usb;
  	struct usb_phy		*transceiver;
  	struct notifier_block	usb_nb;
  	struct work_struct	work;
  	int			irq_chg;
  	int			irq_bci;
  	struct regulator	*usb_reg;
  	int			usb_enabled;
  
  	unsigned long		event;
  };
  
  /*
   * clear and set bits on an given register on a given module
   */
  static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
  {
  	u8 val = 0;
  	int ret;
  
  	ret = twl_i2c_read_u8(mod_no, &val, reg);
  	if (ret)
  		return ret;
  
  	val &= ~clear;
  	val |= set;
  
  	return twl_i2c_write_u8(mod_no, val, reg);
  }
  
  static int twl4030_bci_read(u8 reg, u8 *val)
  {
  	return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
  }
  
  static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
  {
  	return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
  			TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
  			TWL4030_PM_MASTER_BOOT_BCI);
  }
  
  static int twl4030bci_read_adc_val(u8 reg)
  {
  	int ret, temp;
  	u8 val;
  
  	/* read MSB */
  	ret = twl4030_bci_read(reg + 1, &val);
  	if (ret)
  		return ret;
  
  	temp = (int)(val & 0x03) << 8;
  
  	/* read LSB */
  	ret = twl4030_bci_read(reg, &val);
  	if (ret)
  		return ret;
  
  	return temp | val;
  }
  
  /*
   * Check if VBUS power is present
   */
  static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
  {
  	int ret;
  	u8 hwsts;
  
  	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
  			      TWL4030_PM_MASTER_STS_HW_CONDITIONS);
  	if (ret < 0)
  		return 0;
  
  	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x
  ", hwsts);
  
  	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
  	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
  		return 1;
  
  	return 0;
  }
  
  /*
   * Enable/Disable USB Charge functionality.
   */
  static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
  {
  	int ret;
  
  	if (enable) {
  		/* Check for USB charger connected */
  		if (!twl4030_bci_have_vbus(bci))
  			return -ENODEV;
  
  		/*
  		 * Until we can find out what current the device can provide,
  		 * require a module param to enable USB charging.
  		 */
  		if (!allow_usb) {
  			dev_warn(bci->dev, "USB charging is disabled.
  ");
  			return -EACCES;
  		}
  
  		/* Need to keep regulator on */
  		if (!bci->usb_enabled) {
  			ret = regulator_enable(bci->usb_reg);
  			if (ret) {
  				dev_err(bci->dev,
  					"Failed to enable regulator
  ");
  				return ret;
  			}
  			bci->usb_enabled = 1;
  		}
  
  		/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
  		ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
  		if (ret < 0)
  			return ret;
  
  		/* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
  		ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
  			TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
  	} else {
  		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
  		if (bci->usb_enabled) {
  			regulator_disable(bci->usb_reg);
  			bci->usb_enabled = 0;
  		}
  	}
  
  	return ret;
  }
  
  /*
   * Enable/Disable AC Charge funtionality.
   */
  static int twl4030_charger_enable_ac(bool enable)
  {
  	int ret;
  
  	if (enable)
  		ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
  	else
  		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
  
  	return ret;
  }
  
  /*
   * Enable/Disable charging of Backup Battery.
   */
  static int twl4030_charger_enable_backup(int uvolt, int uamp)
  {
  	int ret;
  	u8 flags;
  
  	if (uvolt < 2500000 ||
  	    uamp < 25) {
  		/* disable charging of backup battery */
  		ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
  					TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
  		return ret;
  	}
  
  	flags = TWL4030_BBCHEN;
  	if (uvolt >= 3200000)
  		flags |= TWL4030_BBSEL_3V2;
  	else if (uvolt >= 3100000)
  		flags |= TWL4030_BBSEL_3V1;
  	else if (uvolt >= 3000000)
  		flags |= TWL4030_BBSEL_3V0;
  	else
  		flags |= TWL4030_BBSEL_2V5;
  
  	if (uamp >= 1000)
  		flags |= TWL4030_BBISEL_1000uA;
  	else if (uamp >= 500)
  		flags |= TWL4030_BBISEL_500uA;
  	else if (uamp >= 150)
  		flags |= TWL4030_BBISEL_150uA;
  	else
  		flags |= TWL4030_BBISEL_25uA;
  
  	ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
  				TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
  				flags,
  				TWL4030_BB_CFG);
  
  	return ret;
  }
  
  /*
   * TWL4030 CHG_PRES (AC charger presence) events
   */
  static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
  {
  	struct twl4030_bci *bci = arg;
  
  	dev_dbg(bci->dev, "CHG_PRES irq
  ");
  	power_supply_changed(&bci->ac);
  	power_supply_changed(&bci->usb);
  
  	return IRQ_HANDLED;
  }
  
  /*
   * TWL4030 BCI monitoring events
   */
  static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
  {
  	struct twl4030_bci *bci = arg;
  	u8 irqs1, irqs2;
  	int ret;
  
  	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
  			      TWL4030_INTERRUPTS_BCIISR1A);
  	if (ret < 0)
  		return IRQ_HANDLED;
  
  	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
  			      TWL4030_INTERRUPTS_BCIISR2A);
  	if (ret < 0)
  		return IRQ_HANDLED;
  
  	dev_dbg(bci->dev, "BCI irq %02x %02x
  ", irqs2, irqs1);
  
  	if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
  		/* charger state change, inform the core */
  		power_supply_changed(&bci->ac);
  		power_supply_changed(&bci->usb);
  	}
  
  	/* various monitoring events, for now we just log them here */
  	if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
  		dev_warn(bci->dev, "battery temperature out of range
  ");
  
  	if (irqs1 & TWL4030_BATSTS)
  		dev_crit(bci->dev, "battery disconnected
  ");
  
  	if (irqs2 & TWL4030_VBATOV)
  		dev_crit(bci->dev, "VBAT overvoltage
  ");
  
  	if (irqs2 & TWL4030_VBUSOV)
  		dev_crit(bci->dev, "VBUS overvoltage
  ");
  
  	if (irqs2 & TWL4030_ACCHGOV)
  		dev_crit(bci->dev, "Ac charger overvoltage
  ");
  
  	return IRQ_HANDLED;
  }
  
  static void twl4030_bci_usb_work(struct work_struct *data)
  {
  	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
  
  	switch (bci->event) {
  	case USB_EVENT_VBUS:
  	case USB_EVENT_CHARGER:
  		twl4030_charger_enable_usb(bci, true);
  		break;
  	case USB_EVENT_NONE:
  		twl4030_charger_enable_usb(bci, false);
  		break;
  	}
  }
  
  static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
  			       void *priv)
  {
  	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
  
  	dev_dbg(bci->dev, "OTG notify %lu
  ", val);
  
  	bci->event = val;
  	schedule_work(&bci->work);
  
  	return NOTIFY_OK;
  }
  
  /*
   * TI provided formulas:
   * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
   * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
   * Here we use integer approximation of:
   * CGAIN == 0: val * 1.6618 - 0.85
   * CGAIN == 1: (val * 1.6618 - 0.85) * 2
   */
  static int twl4030_charger_get_current(void)
  {
  	int curr;
  	int ret;
  	u8 bcictl1;
  
  	curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
  	if (curr < 0)
  		return curr;
  
  	ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
  	if (ret)
  		return ret;
  
  	ret = (curr * 16618 - 850 * 10000) / 10;
  	if (bcictl1 & TWL4030_CGAIN)
  		ret *= 2;
  
  	return ret;
  }
  
  /*
   * Returns the main charge FSM state
   * Or < 0 on failure.
   */
  static int twl4030bci_state(struct twl4030_bci *bci)
  {
  	int ret;
  	u8 state;
  
  	ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
  	if (ret) {
  		pr_err("twl4030_bci: error reading BCIMSTATEC
  ");
  		return ret;
  	}
  
  	dev_dbg(bci->dev, "state: %02x
  ", state);
  
  	return state;
  }
  
  static int twl4030_bci_state_to_status(int state)
  {
  	state &= TWL4030_MSTATEC_MASK;
  	if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
  		return POWER_SUPPLY_STATUS_CHARGING;
  	else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
  					state <= TWL4030_MSTATEC_COMPLETE4)
  		return POWER_SUPPLY_STATUS_FULL;
  	else
  		return POWER_SUPPLY_STATUS_NOT_CHARGING;
  }
  
  static int twl4030_bci_get_property(struct power_supply *psy,
  				    enum power_supply_property psp,
  				    union power_supply_propval *val)
  {
  	struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
  	int is_charging;
  	int state;
  	int ret;
  
  	state = twl4030bci_state(bci);
  	if (state < 0)
  		return state;
  
  	if (psy->type == POWER_SUPPLY_TYPE_USB)
  		is_charging = state & TWL4030_MSTATEC_USB;
  	else
  		is_charging = state & TWL4030_MSTATEC_AC;
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_STATUS:
  		if (is_charging)
  			val->intval = twl4030_bci_state_to_status(state);
  		else
  			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  		break;
  	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  		/* charging must be active for meaningful result */
  		if (!is_charging)
  			return -ENODATA;
  		if (psy->type == POWER_SUPPLY_TYPE_USB) {
  			ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
  			if (ret < 0)
  				return ret;
  			/* BCIVBUS uses ADCIN8, 7/1023 V/step */
  			val->intval = ret * 6843;
  		} else {
  			ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
  			if (ret < 0)
  				return ret;
  			/* BCIVAC uses ADCIN11, 10/1023 V/step */
  			val->intval = ret * 9775;
  		}
  		break;
  	case POWER_SUPPLY_PROP_CURRENT_NOW:
  		if (!is_charging)
  			return -ENODATA;
  		/* current measurement is shared between AC and USB */
  		ret = twl4030_charger_get_current();
  		if (ret < 0)
  			return ret;
  		val->intval = ret;
  		break;
  	case POWER_SUPPLY_PROP_ONLINE:
  		val->intval = is_charging &&
  			twl4030_bci_state_to_status(state) !=
  				POWER_SUPPLY_STATUS_NOT_CHARGING;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static enum power_supply_property twl4030_charger_props[] = {
  	POWER_SUPPLY_PROP_STATUS,
  	POWER_SUPPLY_PROP_ONLINE,
  	POWER_SUPPLY_PROP_VOLTAGE_NOW,
  	POWER_SUPPLY_PROP_CURRENT_NOW,
  };
  
  #ifdef CONFIG_OF
  static const struct twl4030_bci_platform_data *
  twl4030_bci_parse_dt(struct device *dev)
  {
  	struct device_node *np = dev->of_node;
  	struct twl4030_bci_platform_data *pdata;
  	u32 num;
  
  	if (!np)
  		return NULL;
  	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
  	if (!pdata)
  		return pdata;
  
  	if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
  		pdata->bb_uvolt = num;
  	if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
  		pdata->bb_uamp = num;
  	return pdata;
  }
  #else
  static inline const struct twl4030_bci_platform_data *
  twl4030_bci_parse_dt(struct device *dev)
  {
  	return NULL;
  }
  #endif
  
  static int __init twl4030_bci_probe(struct platform_device *pdev)
  {
  	struct twl4030_bci *bci;
  	const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
  	int ret;
  	u32 reg;
  
  	bci = kzalloc(sizeof(*bci), GFP_KERNEL);
  	if (bci == NULL)
  		return -ENOMEM;
  
  	if (!pdata)
  		pdata = twl4030_bci_parse_dt(&pdev->dev);
  
  	bci->dev = &pdev->dev;
  	bci->irq_chg = platform_get_irq(pdev, 0);
  	bci->irq_bci = platform_get_irq(pdev, 1);
  
  	platform_set_drvdata(pdev, bci);
  
  	bci->ac.name = "twl4030_ac";
  	bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
  	bci->ac.properties = twl4030_charger_props;
  	bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
  	bci->ac.get_property = twl4030_bci_get_property;
  
  	ret = power_supply_register(&pdev->dev, &bci->ac);
  	if (ret) {
  		dev_err(&pdev->dev, "failed to register ac: %d
  ", ret);
  		goto fail_register_ac;
  	}
  
  	bci->usb.name = "twl4030_usb";
  	bci->usb.type = POWER_SUPPLY_TYPE_USB;
  	bci->usb.properties = twl4030_charger_props;
  	bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
  	bci->usb.get_property = twl4030_bci_get_property;
  
  	bci->usb_reg = regulator_get(bci->dev, "bci3v1");
  
  	ret = power_supply_register(&pdev->dev, &bci->usb);
  	if (ret) {
  		dev_err(&pdev->dev, "failed to register usb: %d
  ", ret);
  		goto fail_register_usb;
  	}
  
  	ret = request_threaded_irq(bci->irq_chg, NULL,
  			twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
  			bci);
  	if (ret < 0) {
  		dev_err(&pdev->dev, "could not request irq %d, status %d
  ",
  			bci->irq_chg, ret);
  		goto fail_chg_irq;
  	}
  
  	ret = request_threaded_irq(bci->irq_bci, NULL,
  			twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
  	if (ret < 0) {
  		dev_err(&pdev->dev, "could not request irq %d, status %d
  ",
  			bci->irq_bci, ret);
  		goto fail_bci_irq;
  	}
  
  	INIT_WORK(&bci->work, twl4030_bci_usb_work);
  
  	bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
  	if (!IS_ERR_OR_NULL(bci->transceiver)) {
  		bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
  		usb_register_notifier(bci->transceiver, &bci->usb_nb);
  	}
  
  	/* Enable interrupts now. */
  	reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
  		TWL4030_TBATOR1 | TWL4030_BATSTS);
  	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
  			       TWL4030_INTERRUPTS_BCIIMR1A);
  	if (ret < 0) {
  		dev_err(&pdev->dev, "failed to unmask interrupts: %d
  ", ret);
  		goto fail_unmask_interrupts;
  	}
  
  	reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
  	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
  			       TWL4030_INTERRUPTS_BCIIMR2A);
  	if (ret < 0)
  		dev_warn(&pdev->dev, "failed to unmask interrupts: %d
  ", ret);
  
  	twl4030_charger_enable_ac(true);
  	twl4030_charger_enable_usb(bci, true);
  	if (pdata)
  		twl4030_charger_enable_backup(pdata->bb_uvolt,
  					      pdata->bb_uamp);
  	else
  		twl4030_charger_enable_backup(0, 0);
  
  	return 0;
  
  fail_unmask_interrupts:
  	if (!IS_ERR_OR_NULL(bci->transceiver)) {
  		usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
  		usb_put_phy(bci->transceiver);
  	}
  	free_irq(bci->irq_bci, bci);
  fail_bci_irq:
  	free_irq(bci->irq_chg, bci);
  fail_chg_irq:
  	power_supply_unregister(&bci->usb);
  fail_register_usb:
  	power_supply_unregister(&bci->ac);
  fail_register_ac:
  	kfree(bci);
  
  	return ret;
  }
  
  static int __exit twl4030_bci_remove(struct platform_device *pdev)
  {
  	struct twl4030_bci *bci = platform_get_drvdata(pdev);
  
  	twl4030_charger_enable_ac(false);
  	twl4030_charger_enable_usb(bci, false);
  	twl4030_charger_enable_backup(0, 0);
  
  	/* mask interrupts */
  	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
  			 TWL4030_INTERRUPTS_BCIIMR1A);
  	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
  			 TWL4030_INTERRUPTS_BCIIMR2A);
  
  	if (!IS_ERR_OR_NULL(bci->transceiver)) {
  		usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
  		usb_put_phy(bci->transceiver);
  	}
  	free_irq(bci->irq_bci, bci);
  	free_irq(bci->irq_chg, bci);
  	power_supply_unregister(&bci->usb);
  	power_supply_unregister(&bci->ac);
  	kfree(bci);
  
  	return 0;
  }
  
  static const struct of_device_id twl_bci_of_match[] = {
  	{.compatible = "ti,twl4030-bci", },
  	{ }
  };
  MODULE_DEVICE_TABLE(of, twl_bci_of_match);
  
  static struct platform_driver twl4030_bci_driver = {
  	.driver	= {
  		.name	= "twl4030_bci",
  		.owner	= THIS_MODULE,
  		.of_match_table = of_match_ptr(twl_bci_of_match),
  	},
  	.remove	= __exit_p(twl4030_bci_remove),
  };
  
  module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
  
  MODULE_AUTHOR("Gražvydas Ignotas");
  MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:twl4030_bci");