[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / twl4030_charger.c

/*
 * 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\n", 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.\n");
			return -EACCES;
		}

		/* Need to keep regulator on */
		if (!bci->usb_enabled) {
			regulator_enable(bci->usb_reg);
			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\n");
	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\n", 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\n");

	if (irqs1 & TWL4030_BATSTS)
		dev_crit(bci->dev, "battery disconnected\n");

	if (irqs2 & TWL4030_VBATOV)
		dev_crit(bci->dev, "VBAT overvoltage\n");

	if (irqs2 & TWL4030_VBUSOV)
		dev_crit(bci->dev, "VBUS overvoltage\n");

	if (irqs2 & TWL4030_ACCHGOV)
		dev_crit(bci->dev, "Ac charger overvoltage\n");

	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\n", 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\n");
		return ret;
	}

	dev_dbg(bci->dev, "state: %02x\n", 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,
};

static int __init twl4030_bci_probe(struct platform_device *pdev)
{
	struct twl4030_bci *bci;
	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;

	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\n", 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\n", 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\n",
			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\n",
			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\n", 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\n", ret);

	twl4030_charger_enable_ac(true);
	twl4030_charger_enable_usb(bci, true);
	twl4030_charger_enable_backup(pdata->bb_uvolt,
				      pdata->bb_uamp);

	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:
	platform_set_drvdata(pdev, NULL);
	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);
	platform_set_drvdata(pdev, NULL);
	kfree(bci);

	return 0;
}

static struct platform_driver twl4030_bci_driver = {
	.driver	= {
		.name	= "twl4030_bci",
		.owner	= THIS_MODULE,
	},
	.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");
Commit	Line	Data
2e727f17 GI	1	/*
	2	* TWL4030/TPS65950 BCI (Battery Charger Interface) driver
	3	*
	4	* Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
	5	*
	6	* based on twl4030_bci_battery.c by TI
	7	* Copyright (C) 2008 Texas Instruments, Inc.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*/
	14
	15	#include <linux/init.h>
	16	#include <linux/module.h>
	17	#include <linux/slab.h>
ded017ee	18	#include <linux/err.h>
2e727f17 GI	19	#include <linux/platform_device.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/i2c/twl.h>
	22	#include <linux/power_supply.h>
	23	#include <linux/notifier.h>
	24	#include <linux/usb/otg.h>
ab37813f	25	#include <linux/regulator/machine.h>
2e727f17 GI	26
	27	#define TWL4030_BCIMSTATEC 0x02
	28	#define TWL4030_BCIICHG 0x08
	29	#define TWL4030_BCIVAC 0x0a
	30	#define TWL4030_BCIVBUS 0x0c
	31	#define TWL4030_BCIMFSTS4 0x10
	32	#define TWL4030_BCICTL1 0x23
210d4bc8	33	#define TWL4030_BB_CFG 0x12
2e727f17 GI	34
	35	#define TWL4030_BCIAUTOWEN BIT(5)
	36	#define TWL4030_CONFIG_DONE BIT(4)
	37	#define TWL4030_BCIAUTOUSB BIT(1)
	38	#define TWL4030_BCIAUTOAC BIT(0)
	39	#define TWL4030_CGAIN BIT(5)
	40	#define TWL4030_USBFASTMCHG BIT(2)
	41	#define TWL4030_STS_VBUS BIT(7)
	42	#define TWL4030_STS_USB_ID BIT(2)
210d4bc8	43	#define TWL4030_BBCHEN BIT(4)
94b05cab IH	44	#define TWL4030_BBSEL_MASK 0x0c
	45	#define TWL4030_BBSEL_2V5 0x00
	46	#define TWL4030_BBSEL_3V0 0x04
	47	#define TWL4030_BBSEL_3V1 0x08
	48	#define TWL4030_BBSEL_3V2 0x0c
	49	#define TWL4030_BBISEL_MASK 0x03
	50	#define TWL4030_BBISEL_25uA 0x00
	51	#define TWL4030_BBISEL_150uA 0x01
	52	#define TWL4030_BBISEL_500uA 0x02
	53	#define TWL4030_BBISEL_1000uA 0x03
2e727f17 GI	54
	55	/* BCI interrupts */
	56	#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
	57	#define TWL4030_TMOVF BIT(1) /* Timer overflow */
	58	#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
	59	#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
	60	#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
	61	#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
	62	#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
	63	#define TWL4030_BATSTS BIT(7) /* Battery status */
	64
	65	#define TWL4030_VBATLVL BIT(0) /* VBAT level */
	66	#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
	67	#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
	68	#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
	69
	70	#define TWL4030_MSTATEC_USB BIT(4)
	71	#define TWL4030_MSTATEC_AC BIT(5)
	72	#define TWL4030_MSTATEC_MASK 0x0f
	73	#define TWL4030_MSTATEC_QUICK1 0x02
	74	#define TWL4030_MSTATEC_QUICK7 0x07
	75	#define TWL4030_MSTATEC_COMPLETE1 0x0b
	76	#define TWL4030_MSTATEC_COMPLETE4 0x0e
	77
	78	static bool allow_usb;
28d48f04	79	module_param(allow_usb, bool, 0644);
2e727f17 GI	80	MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
	81
	82	struct twl4030_bci {
	83	struct device *dev;
	84	struct power_supply ac;
	85	struct power_supply usb;
86753811	86	struct usb_phy *transceiver;
fcc8ebc9	87	struct notifier_block usb_nb;
d6ccc442	88	struct work_struct work;
2e727f17 GI	89	int irq_chg;
2e727f17 GI	90	int irq_bci;
ab37813f N	91	struct regulator *usb_reg;
ab37813f N	92	int usb_enabled;
d6ccc442 HK	93
d6ccc442 HK	94	unsigned long event;
2e727f17 GI	95	};
	96
	97	/*
	98	* clear and set bits on an given register on a given module
	99	*/
	100	static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
	101	{
	102	u8 val = 0;
	103	int ret;
	104
	105	ret = twl_i2c_read_u8(mod_no, &val, reg);
	106	if (ret)
	107	return ret;
	108
	109	val &= ~clear;
	110	val \|= set;
	111
	112	return twl_i2c_write_u8(mod_no, val, reg);
	113	}
	114
	115	static int twl4030_bci_read(u8 reg, u8 *val)
	116	{
e9f14c18	117	return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
2e727f17 GI	118	}
	119
	120	static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
	121	{
e9f14c18	122	return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
2e727f17 GI	123	TWL4030_CONFIG_DONE \| TWL4030_BCIAUTOWEN \| set,
	124	TWL4030_PM_MASTER_BOOT_BCI);
	125	}
	126
	127	static int twl4030bci_read_adc_val(u8 reg)
	128	{
	129	int ret, temp;
	130	u8 val;
	131
	132	/* read MSB */
	133	ret = twl4030_bci_read(reg + 1, &val);
	134	if (ret)
	135	return ret;
	136
	137	temp = (int)(val & 0x03) << 8;
	138
	139	/* read LSB */
	140	ret = twl4030_bci_read(reg, &val);
	141	if (ret)
	142	return ret;
	143
	144	return temp \| val;
	145	}
	146
	147	/*
	148	* Check if VBUS power is present
	149	*/
	150	static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
	151	{
	152	int ret;
	153	u8 hwsts;
	154
e9f14c18	155	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
2e727f17 GI	156	TWL4030_PM_MASTER_STS_HW_CONDITIONS);
	157	if (ret < 0)
	158	return 0;
	159
	160	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
	161
	162	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
	163	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
	164	return 1;
	165
	166	return 0;
	167	}
	168
	169	/*
9c645d2f	170	* Enable/Disable USB Charge functionality.
2e727f17 GI	171	*/
	172	static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
	173	{
	174	int ret;
	175
	176	if (enable) {
9c645d2f	177	/* Check for USB charger connected */
2e727f17 GI	178	if (!twl4030_bci_have_vbus(bci))
	179	return -ENODEV;
	180
	181	/*
	182	* Until we can find out what current the device can provide,
	183	* require a module param to enable USB charging.
	184	*/
	185	if (!allow_usb) {
	186	dev_warn(bci->dev, "USB charging is disabled.\n");
	187	return -EACCES;
	188	}
	189
ab37813f N	190	/* Need to keep regulator on */
	191	if (!bci->usb_enabled) {
	192	regulator_enable(bci->usb_reg);
	193	bci->usb_enabled = 1;
	194	}
	195
2e727f17 GI	196	/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
	197	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
	198	if (ret < 0)
	199	return ret;
	200
	201	/* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
e9f14c18	202	ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
2e727f17 GI	203	TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
	204	} else {
	205	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
ab37813f N	206	if (bci->usb_enabled) {
	207	regulator_disable(bci->usb_reg);
	208	bci->usb_enabled = 0;
	209	}
2e727f17 GI	210	}
	211
	212	return ret;
	213	}
	214
	215	/*
	216	* Enable/Disable AC Charge funtionality.
	217	*/
	218	static int twl4030_charger_enable_ac(bool enable)
	219	{
	220	int ret;
	221
	222	if (enable)
	223	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
	224	else
	225	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
	226
	227	return ret;
	228	}
	229
210d4bc8 N	230	/*
	231	* Enable/Disable charging of Backup Battery.
	232	*/
	233	static int twl4030_charger_enable_backup(int uvolt, int uamp)
	234	{
	235	int ret;
	236	u8 flags;
	237
	238	if (uvolt < 2500000 \|\|
	239	uamp < 25) {
	240	/* disable charging of backup battery */
e9f14c18	241	ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
210d4bc8 N	242	TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
	243	return ret;
	244	}
	245
	246	flags = TWL4030_BBCHEN;
	247	if (uvolt >= 3200000)
	248	flags \|= TWL4030_BBSEL_3V2;
	249	else if (uvolt >= 3100000)
	250	flags \|= TWL4030_BBSEL_3V1;
	251	else if (uvolt >= 3000000)
	252	flags \|= TWL4030_BBSEL_3V0;
	253	else
	254	flags \|= TWL4030_BBSEL_2V5;
	255
	256	if (uamp >= 1000)
	257	flags \|= TWL4030_BBISEL_1000uA;
	258	else if (uamp >= 500)
	259	flags \|= TWL4030_BBISEL_500uA;
	260	else if (uamp >= 150)
	261	flags \|= TWL4030_BBISEL_150uA;
	262	else
	263	flags \|= TWL4030_BBISEL_25uA;
	264
e9f14c18	265	ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
210d4bc8 N	266	TWL4030_BBSEL_MASK \| TWL4030_BBISEL_MASK,
	267	flags,
	268	TWL4030_BB_CFG);
	269
	270	return ret;
	271	}
	272
2e727f17 GI	273	/*
	274	* TWL4030 CHG_PRES (AC charger presence) events
	275	*/
	276	static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
	277	{
	278	struct twl4030_bci *bci = arg;
	279
	280	dev_dbg(bci->dev, "CHG_PRES irq\n");
	281	power_supply_changed(&bci->ac);
	282	power_supply_changed(&bci->usb);
	283
	284	return IRQ_HANDLED;
	285	}
	286
	287	/*
	288	* TWL4030 BCI monitoring events
	289	*/
	290	static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
	291	{
	292	struct twl4030_bci *bci = arg;
	293	u8 irqs1, irqs2;
	294	int ret;
	295
	296	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
	297	TWL4030_INTERRUPTS_BCIISR1A);
	298	if (ret < 0)
	299	return IRQ_HANDLED;
	300
	301	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
	302	TWL4030_INTERRUPTS_BCIISR2A);
	303	if (ret < 0)
	304	return IRQ_HANDLED;
	305
	306	dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
	307
	308	if (irqs1 & (TWL4030_ICHGLOW \| TWL4030_ICHGEOC)) {
	309	/* charger state change, inform the core */
	310	power_supply_changed(&bci->ac);
	311	power_supply_changed(&bci->usb);
	312	}
	313
	314	/* various monitoring events, for now we just log them here */
	315	if (irqs1 & (TWL4030_TBATOR2 \| TWL4030_TBATOR1))
	316	dev_warn(bci->dev, "battery temperature out of range\n");
	317
	318	if (irqs1 & TWL4030_BATSTS)
	319	dev_crit(bci->dev, "battery disconnected\n");
	320
	321	if (irqs2 & TWL4030_VBATOV)
	322	dev_crit(bci->dev, "VBAT overvoltage\n");
	323
	324	if (irqs2 & TWL4030_VBUSOV)
	325	dev_crit(bci->dev, "VBUS overvoltage\n");
	326
	327	if (irqs2 & TWL4030_ACCHGOV)
	328	dev_crit(bci->dev, "Ac charger overvoltage\n");
	329
	330	return IRQ_HANDLED;
	331	}
	332
d6ccc442	333	static void twl4030_bci_usb_work(struct work_struct *data)
2e727f17	334	{
d6ccc442	335	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
2e727f17	336
d6ccc442	337	switch (bci->event) {
2e727f17 GI	338	case USB_EVENT_VBUS:
	339	case USB_EVENT_CHARGER:
	340	twl4030_charger_enable_usb(bci, true);
	341	break;
	342	case USB_EVENT_NONE:
	343	twl4030_charger_enable_usb(bci, false);
	344	break;
	345	}
d6ccc442 HK	346	}
	347
	348	static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
	349	void *priv)
	350	{
fcc8ebc9	351	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
d6ccc442 HK	352
	353	dev_dbg(bci->dev, "OTG notify %lu\n", val);
	354
	355	bci->event = val;
	356	schedule_work(&bci->work);
2e727f17 GI	357
	358	return NOTIFY_OK;
	359	}
	360
	361	/*
	362	* TI provided formulas:
	363	* CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
	364	* CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
	365	* Here we use integer approximation of:
	366	* CGAIN == 0: val * 1.6618 - 0.85
	367	* CGAIN == 1: (val * 1.6618 - 0.85) * 2
	368	*/
	369	static int twl4030_charger_get_current(void)
	370	{
	371	int curr;
	372	int ret;
	373	u8 bcictl1;
	374
	375	curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
	376	if (curr < 0)
	377	return curr;
	378
	379	ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
	380	if (ret)
	381	return ret;
	382
	383	ret = (curr * 16618 - 850 * 10000) / 10;
	384	if (bcictl1 & TWL4030_CGAIN)
	385	ret *= 2;
	386
	387	return ret;
	388	}
	389
	390	/*
	391	* Returns the main charge FSM state
	392	* Or < 0 on failure.
	393	*/
	394	static int twl4030bci_state(struct twl4030_bci *bci)
	395	{
	396	int ret;
	397	u8 state;
	398
	399	ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
	400	if (ret) {
	401	pr_err("twl4030_bci: error reading BCIMSTATEC\n");
	402	return ret;
	403	}
	404
	405	dev_dbg(bci->dev, "state: %02x\n", state);
	406
	407	return state;
	408	}
	409
	410	static int twl4030_bci_state_to_status(int state)
	411	{
	412	state &= TWL4030_MSTATEC_MASK;
	413	if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
	414	return POWER_SUPPLY_STATUS_CHARGING;
	415	else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
	416	state <= TWL4030_MSTATEC_COMPLETE4)
	417	return POWER_SUPPLY_STATUS_FULL;
	418	else
	419	return POWER_SUPPLY_STATUS_NOT_CHARGING;
	420	}
421
422	static int twl4030_bci_get_property(struct power_supply *psy,
423	enum power_supply_property psp,
424	union power_supply_propval *val)
425	{
426	struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
427	int is_charging;
428	int state;
429	int ret;
430
431	state = twl4030bci_state(bci);
432	if (state < 0)
433	return state;
434
435	if (psy->type == POWER_SUPPLY_TYPE_USB)
436	is_charging = state & TWL4030_MSTATEC_USB;
437	else
438	is_charging = state & TWL4030_MSTATEC_AC;
439
440	switch (psp) {
441	case POWER_SUPPLY_PROP_STATUS:
442	if (is_charging)
443	val->intval = twl4030_bci_state_to_status(state);
444	else
445	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
446	break;
447	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
448	/* charging must be active for meaningful result */
449	if (!is_charging)
450	return -ENODATA;
451	if (psy->type == POWER_SUPPLY_TYPE_USB) {
452	ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
453	if (ret < 0)
454	return ret;
455	/* BCIVBUS uses ADCIN8, 7/1023 V/step */
456	val->intval = ret * 6843;
457	} else {
458	ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
459	if (ret < 0)
460	return ret;
461	/* BCIVAC uses ADCIN11, 10/1023 V/step */
462	val->intval = ret * 9775;
463	}
464	break;
465	case POWER_SUPPLY_PROP_CURRENT_NOW:
466	if (!is_charging)
467	return -ENODATA;
468	/* current measurement is shared between AC and USB */
469	ret = twl4030_charger_get_current();
470	if (ret < 0)
471	return ret;
472	val->intval = ret;
473	break;
474	case POWER_SUPPLY_PROP_ONLINE:
475	val->intval = is_charging &&
476	twl4030_bci_state_to_status(state) !=
477	POWER_SUPPLY_STATUS_NOT_CHARGING;
478	break;
479	default:
480	return -EINVAL;
481	}
482
483	return 0;
484	}
485
486	static enum power_supply_property twl4030_charger_props[] = {
487	POWER_SUPPLY_PROP_STATUS,
488	POWER_SUPPLY_PROP_ONLINE,
489	POWER_SUPPLY_PROP_VOLTAGE_NOW,
490	POWER_SUPPLY_PROP_CURRENT_NOW,
491	};
492
493	static int __init twl4030_bci_probe(struct platform_device *pdev)
494	{
495	struct twl4030_bci *bci;
210d4bc8	496	struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
2e727f17	497	int ret;
28d48f04	498	u32 reg;
2e727f17 GI	499
	500	bci = kzalloc(sizeof(*bci), GFP_KERNEL);
	501	if (bci == NULL)
	502	return -ENOMEM;
	503
	504	bci->dev = &pdev->dev;
	505	bci->irq_chg = platform_get_irq(pdev, 0);
	506	bci->irq_bci = platform_get_irq(pdev, 1);
	507
	508	platform_set_drvdata(pdev, bci);
	509
	510	bci->ac.name = "twl4030_ac";
	511	bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
	512	bci->ac.properties = twl4030_charger_props;
	513	bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
	514	bci->ac.get_property = twl4030_bci_get_property;
	515
	516	ret = power_supply_register(&pdev->dev, &bci->ac);
	517	if (ret) {
	518	dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
	519	goto fail_register_ac;
	520	}
	521
	522	bci->usb.name = "twl4030_usb";
	523	bci->usb.type = POWER_SUPPLY_TYPE_USB;
	524	bci->usb.properties = twl4030_charger_props;
	525	bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
	526	bci->usb.get_property = twl4030_bci_get_property;
	527
ab37813f N	528	bci->usb_reg = regulator_get(bci->dev, "bci3v1");
ab37813f N	529
2e727f17 GI	530	ret = power_supply_register(&pdev->dev, &bci->usb);
	531	if (ret) {
	532	dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
	533	goto fail_register_usb;
	534	}
	535
	536	ret = request_threaded_irq(bci->irq_chg, NULL,
a2778b0f FW	537	twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
a2778b0f FW	538	bci);
2e727f17 GI	539	if (ret < 0) {
	540	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	541	bci->irq_chg, ret);
	542	goto fail_chg_irq;
	543	}
	544
	545	ret = request_threaded_irq(bci->irq_bci, NULL,
a2778b0f	546	twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
2e727f17 GI	547	if (ret < 0) {
	548	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	549	bci->irq_bci, ret);
	550	goto fail_bci_irq;
	551	}
	552
d6ccc442 HK	553	INIT_WORK(&bci->work, twl4030_bci_usb_work);
d6ccc442 HK	554
662dca54	555	bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
ded017ee	556	if (!IS_ERR_OR_NULL(bci->transceiver)) {
fcc8ebc9 HK	557	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
fcc8ebc9 HK	558	usb_register_notifier(bci->transceiver, &bci->usb_nb);
2e727f17 GI	559	}
	560
	561	/* Enable interrupts now. */
28d48f04	562	reg = ~(u32)(TWL4030_ICHGLOW \| TWL4030_ICHGEOC \| TWL4030_TBATOR2 \|
2e727f17 GI	563	TWL4030_TBATOR1 \| TWL4030_BATSTS);
	564	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	565	TWL4030_INTERRUPTS_BCIIMR1A);
	566	if (ret < 0) {
	567	dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	568	goto fail_unmask_interrupts;
	569	}
	570
28d48f04	571	reg = ~(u32)(TWL4030_VBATOV \| TWL4030_VBUSOV \| TWL4030_ACCHGOV);
2e727f17 GI	572	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	573	TWL4030_INTERRUPTS_BCIIMR2A);
	574	if (ret < 0)
	575	dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	576
	577	twl4030_charger_enable_ac(true);
	578	twl4030_charger_enable_usb(bci, true);
210d4bc8 N	579	twl4030_charger_enable_backup(pdata->bb_uvolt,
210d4bc8 N	580	pdata->bb_uamp);
2e727f17 GI	581
	582	return 0;
	583
	584	fail_unmask_interrupts:
ded017ee	585	if (!IS_ERR_OR_NULL(bci->transceiver)) {
fcc8ebc9	586	usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
721002ec	587	usb_put_phy(bci->transceiver);
2e727f17 GI	588	}
	589	free_irq(bci->irq_bci, bci);
	590	fail_bci_irq:
	591	free_irq(bci->irq_chg, bci);
	592	fail_chg_irq:
	593	power_supply_unregister(&bci->usb);
	594	fail_register_usb:
	595	power_supply_unregister(&bci->ac);
	596	fail_register_ac:
	597	platform_set_drvdata(pdev, NULL);
	598	kfree(bci);
	599
	600	return ret;
	601	}
	602
	603	static int __exit twl4030_bci_remove(struct platform_device *pdev)
	604	{
	605	struct twl4030_bci *bci = platform_get_drvdata(pdev);
	606
	607	twl4030_charger_enable_ac(false);
	608	twl4030_charger_enable_usb(bci, false);
210d4bc8	609	twl4030_charger_enable_backup(0, 0);
2e727f17 GI	610
	611	/* mask interrupts */
	612	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	613	TWL4030_INTERRUPTS_BCIIMR1A);
	614	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	615	TWL4030_INTERRUPTS_BCIIMR2A);
	616
ded017ee	617	if (!IS_ERR_OR_NULL(bci->transceiver)) {
fcc8ebc9	618	usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
721002ec	619	usb_put_phy(bci->transceiver);
2e727f17 GI	620	}
	621	free_irq(bci->irq_bci, bci);
	622	free_irq(bci->irq_chg, bci);
	623	power_supply_unregister(&bci->usb);
	624	power_supply_unregister(&bci->ac);
	625	platform_set_drvdata(pdev, NULL);
	626	kfree(bci);
	627
	628	return 0;
	629	}
	630
	631	static struct platform_driver twl4030_bci_driver = {
	632	.driver = {
	633	.name = "twl4030_bci",
	634	.owner = THIS_MODULE,
	635	},
	636	.remove = __exit_p(twl4030_bci_remove),
	637	};
	638
4420dc20	639	module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
2e727f17	640
28d48f04	641	MODULE_AUTHOR("Gražvydas Ignotas");
2e727f17 GI	642	MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
	643	MODULE_LICENSE("GPL");
	644	MODULE_ALIAS("platform:twl4030_bci");