[deliverable/linux.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>

#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_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)

/* 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;

	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(TWL4030_MODULE_MAIN_CHARGE, val, reg);
}

static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
{
	return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0,
			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(TWL4030_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 funtionality.
 */
static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
{
	int ret;

	if (enable) {
		/* Check for USB charger conneted */
		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;
		}

		/* 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(TWL4030_MODULE_MAIN_CHARGE, 0,
			TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
	} else {
		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 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;
}

/*
 * 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;
	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;

	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, 0, 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, 0, 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);

	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);

	/* 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),
};

static int __init twl4030_bci_init(void)
{
	return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
}
module_init(twl4030_bci_init);

static void __exit twl4030_bci_exit(void)
{
	platform_driver_unregister(&twl4030_bci_driver);
}
module_exit(twl4030_bci_exit);

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>
	25
	26	#define TWL4030_BCIMSTATEC 0x02
	27	#define TWL4030_BCIICHG 0x08
	28	#define TWL4030_BCIVAC 0x0a
	29	#define TWL4030_BCIVBUS 0x0c
	30	#define TWL4030_BCIMFSTS4 0x10
	31	#define TWL4030_BCICTL1 0x23
	32
	33	#define TWL4030_BCIAUTOWEN BIT(5)
	34	#define TWL4030_CONFIG_DONE BIT(4)
	35	#define TWL4030_BCIAUTOUSB BIT(1)
	36	#define TWL4030_BCIAUTOAC BIT(0)
	37	#define TWL4030_CGAIN BIT(5)
	38	#define TWL4030_USBFASTMCHG BIT(2)
	39	#define TWL4030_STS_VBUS BIT(7)
	40	#define TWL4030_STS_USB_ID BIT(2)
	41
	42	/* BCI interrupts */
	43	#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
	44	#define TWL4030_TMOVF BIT(1) /* Timer overflow */
	45	#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
	46	#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
	47	#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
	48	#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
	49	#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
	50	#define TWL4030_BATSTS BIT(7) /* Battery status */
	51
	52	#define TWL4030_VBATLVL BIT(0) /* VBAT level */
	53	#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
	54	#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
	55	#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
	56
	57	#define TWL4030_MSTATEC_USB BIT(4)
	58	#define TWL4030_MSTATEC_AC BIT(5)
	59	#define TWL4030_MSTATEC_MASK 0x0f
	60	#define TWL4030_MSTATEC_QUICK1 0x02
	61	#define TWL4030_MSTATEC_QUICK7 0x07
	62	#define TWL4030_MSTATEC_COMPLETE1 0x0b
	63	#define TWL4030_MSTATEC_COMPLETE4 0x0e
	64
	65	static bool allow_usb;
28d48f04	66	module_param(allow_usb, bool, 0644);
2e727f17 GI	67	MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
	68
	69	struct twl4030_bci {
	70	struct device *dev;
	71	struct power_supply ac;
	72	struct power_supply usb;
86753811	73	struct usb_phy *transceiver;
fcc8ebc9	74	struct notifier_block usb_nb;
d6ccc442	75	struct work_struct work;
2e727f17 GI	76	int irq_chg;
2e727f17 GI	77	int irq_bci;
d6ccc442 HK	78
d6ccc442 HK	79	unsigned long event;
2e727f17 GI	80	};
	81
	82	/*
	83	* clear and set bits on an given register on a given module
	84	*/
	85	static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
	86	{
	87	u8 val = 0;
	88	int ret;
	89
	90	ret = twl_i2c_read_u8(mod_no, &val, reg);
	91	if (ret)
	92	return ret;
	93
	94	val &= ~clear;
	95	val \|= set;
	96
	97	return twl_i2c_write_u8(mod_no, val, reg);
	98	}
	99
	100	static int twl4030_bci_read(u8 reg, u8 *val)
	101	{
	102	return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
	103	}
	104
	105	static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
	106	{
	107	return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0,
	108	TWL4030_CONFIG_DONE \| TWL4030_BCIAUTOWEN \| set,
	109	TWL4030_PM_MASTER_BOOT_BCI);
	110	}
	111
	112	static int twl4030bci_read_adc_val(u8 reg)
	113	{
	114	int ret, temp;
	115	u8 val;
	116
	117	/* read MSB */
	118	ret = twl4030_bci_read(reg + 1, &val);
	119	if (ret)
	120	return ret;
	121
	122	temp = (int)(val & 0x03) << 8;
	123
	124	/* read LSB */
	125	ret = twl4030_bci_read(reg, &val);
	126	if (ret)
	127	return ret;
	128
	129	return temp \| val;
	130	}
	131
	132	/*
	133	* Check if VBUS power is present
	134	*/
	135	static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
	136	{
	137	int ret;
	138	u8 hwsts;
	139
	140	ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
	141	TWL4030_PM_MASTER_STS_HW_CONDITIONS);
	142	if (ret < 0)
	143	return 0;
144
145	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
146
147	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
148	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
149	return 1;
150
151	return 0;
152	}
153
154	/*
155	* Enable/Disable USB Charge funtionality.
156	*/
157	static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
158	{
159	int ret;
160
161	if (enable) {
162	/* Check for USB charger conneted */
163	if (!twl4030_bci_have_vbus(bci))
164	return -ENODEV;
165
166	/*
167	* Until we can find out what current the device can provide,
168	* require a module param to enable USB charging.
169	*/
170	if (!allow_usb) {
171	dev_warn(bci->dev, "USB charging is disabled.\n");
172	return -EACCES;
173	}
174
175	/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
176	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
177	if (ret < 0)
178	return ret;
179
180	/* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
181	ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
182	TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
183	} else {
184	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
185	}
186
187	return ret;
188	}
189
190	/*
191	* Enable/Disable AC Charge funtionality.
192	*/
193	static int twl4030_charger_enable_ac(bool enable)
194	{
195	int ret;
196
197	if (enable)
198	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
199	else
200	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
201
202	return ret;
203	}
204
205	/*
206	* TWL4030 CHG_PRES (AC charger presence) events
207	*/
208	static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
209	{
210	struct twl4030_bci *bci = arg;
211
212	dev_dbg(bci->dev, "CHG_PRES irq\n");
213	power_supply_changed(&bci->ac);
214	power_supply_changed(&bci->usb);
215
216	return IRQ_HANDLED;
217	}
218
219	/*
220	* TWL4030 BCI monitoring events
221	*/
222	static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
223	{
224	struct twl4030_bci *bci = arg;
225	u8 irqs1, irqs2;
226	int ret;
227
228	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
229	TWL4030_INTERRUPTS_BCIISR1A);
230	if (ret < 0)
231	return IRQ_HANDLED;
232
233	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
234	TWL4030_INTERRUPTS_BCIISR2A);
235	if (ret < 0)
236	return IRQ_HANDLED;
237
238	dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
239
240	if (irqs1 & (TWL4030_ICHGLOW \| TWL4030_ICHGEOC)) {
241	/* charger state change, inform the core */
242	power_supply_changed(&bci->ac);
243	power_supply_changed(&bci->usb);
244	}
245
246	/* various monitoring events, for now we just log them here */
247	if (irqs1 & (TWL4030_TBATOR2 \| TWL4030_TBATOR1))
248	dev_warn(bci->dev, "battery temperature out of range\n");
249
250	if (irqs1 & TWL4030_BATSTS)
251	dev_crit(bci->dev, "battery disconnected\n");
252
253	if (irqs2 & TWL4030_VBATOV)
254	dev_crit(bci->dev, "VBAT overvoltage\n");
255
256	if (irqs2 & TWL4030_VBUSOV)
257	dev_crit(bci->dev, "VBUS overvoltage\n");
258
259	if (irqs2 & TWL4030_ACCHGOV)
260	dev_crit(bci->dev, "Ac charger overvoltage\n");
261
262	return IRQ_HANDLED;
263	}
264
d6ccc442	265	static void twl4030_bci_usb_work(struct work_struct *data)
2e727f17	266	{
d6ccc442	267	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
2e727f17	268
d6ccc442	269	switch (bci->event) {
2e727f17 GI	270	case USB_EVENT_VBUS:
	271	case USB_EVENT_CHARGER:
	272	twl4030_charger_enable_usb(bci, true);
	273	break;
	274	case USB_EVENT_NONE:
	275	twl4030_charger_enable_usb(bci, false);
	276	break;
	277	}
d6ccc442 HK	278	}
	279
	280	static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
	281	void *priv)
	282	{
fcc8ebc9	283	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
d6ccc442 HK	284
	285	dev_dbg(bci->dev, "OTG notify %lu\n", val);
	286
	287	bci->event = val;
	288	schedule_work(&bci->work);
2e727f17 GI	289
	290	return NOTIFY_OK;
	291	}
	292
	293	/*
	294	* TI provided formulas:
	295	* CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
	296	* CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
	297	* Here we use integer approximation of:
	298	* CGAIN == 0: val * 1.6618 - 0.85
	299	* CGAIN == 1: (val * 1.6618 - 0.85) * 2
	300	*/
	301	static int twl4030_charger_get_current(void)
	302	{
	303	int curr;
	304	int ret;
	305	u8 bcictl1;
	306
	307	curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
	308	if (curr < 0)
	309	return curr;
	310
	311	ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
	312	if (ret)
	313	return ret;
	314
	315	ret = (curr * 16618 - 850 * 10000) / 10;
	316	if (bcictl1 & TWL4030_CGAIN)
	317	ret *= 2;
	318
	319	return ret;
	320	}
	321
	322	/*
	323	* Returns the main charge FSM state
	324	* Or < 0 on failure.
	325	*/
	326	static int twl4030bci_state(struct twl4030_bci *bci)
	327	{
	328	int ret;
	329	u8 state;
	330
	331	ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
	332	if (ret) {
	333	pr_err("twl4030_bci: error reading BCIMSTATEC\n");
	334	return ret;
	335	}
	336
	337	dev_dbg(bci->dev, "state: %02x\n", state);
	338
	339	return state;
	340	}
	341
	342	static int twl4030_bci_state_to_status(int state)
	343	{
	344	state &= TWL4030_MSTATEC_MASK;
	345	if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
	346	return POWER_SUPPLY_STATUS_CHARGING;
	347	else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
	348	state <= TWL4030_MSTATEC_COMPLETE4)
	349	return POWER_SUPPLY_STATUS_FULL;
	350	else
	351	return POWER_SUPPLY_STATUS_NOT_CHARGING;
	352	}
353
354	static int twl4030_bci_get_property(struct power_supply *psy,
355	enum power_supply_property psp,
356	union power_supply_propval *val)
357	{
358	struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
359	int is_charging;
360	int state;
361	int ret;
362
363	state = twl4030bci_state(bci);
364	if (state < 0)
365	return state;
366
367	if (psy->type == POWER_SUPPLY_TYPE_USB)
368	is_charging = state & TWL4030_MSTATEC_USB;
369	else
370	is_charging = state & TWL4030_MSTATEC_AC;
371
372	switch (psp) {
373	case POWER_SUPPLY_PROP_STATUS:
374	if (is_charging)
375	val->intval = twl4030_bci_state_to_status(state);
376	else
377	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
378	break;
379	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
380	/* charging must be active for meaningful result */
381	if (!is_charging)
382	return -ENODATA;
383	if (psy->type == POWER_SUPPLY_TYPE_USB) {
384	ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
385	if (ret < 0)
386	return ret;
387	/* BCIVBUS uses ADCIN8, 7/1023 V/step */
388	val->intval = ret * 6843;
389	} else {
390	ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
391	if (ret < 0)
392	return ret;
393	/* BCIVAC uses ADCIN11, 10/1023 V/step */
394	val->intval = ret * 9775;
395	}
396	break;
397	case POWER_SUPPLY_PROP_CURRENT_NOW:
398	if (!is_charging)
399	return -ENODATA;
400	/* current measurement is shared between AC and USB */
401	ret = twl4030_charger_get_current();
402	if (ret < 0)
403	return ret;
404	val->intval = ret;
405	break;
406	case POWER_SUPPLY_PROP_ONLINE:
407	val->intval = is_charging &&
408	twl4030_bci_state_to_status(state) !=
409	POWER_SUPPLY_STATUS_NOT_CHARGING;
410	break;
411	default:
412	return -EINVAL;
413	}
414
415	return 0;
416	}
417
418	static enum power_supply_property twl4030_charger_props[] = {
419	POWER_SUPPLY_PROP_STATUS,
420	POWER_SUPPLY_PROP_ONLINE,
421	POWER_SUPPLY_PROP_VOLTAGE_NOW,
422	POWER_SUPPLY_PROP_CURRENT_NOW,
423	};
424
425	static int __init twl4030_bci_probe(struct platform_device *pdev)
426	{
427	struct twl4030_bci *bci;
428	int ret;
28d48f04	429	u32 reg;
2e727f17 GI	430
	431	bci = kzalloc(sizeof(*bci), GFP_KERNEL);
	432	if (bci == NULL)
	433	return -ENOMEM;
	434
	435	bci->dev = &pdev->dev;
	436	bci->irq_chg = platform_get_irq(pdev, 0);
	437	bci->irq_bci = platform_get_irq(pdev, 1);
	438
	439	platform_set_drvdata(pdev, bci);
	440
	441	bci->ac.name = "twl4030_ac";
	442	bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
	443	bci->ac.properties = twl4030_charger_props;
	444	bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
	445	bci->ac.get_property = twl4030_bci_get_property;
	446
	447	ret = power_supply_register(&pdev->dev, &bci->ac);
	448	if (ret) {
	449	dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
	450	goto fail_register_ac;
	451	}
	452
	453	bci->usb.name = "twl4030_usb";
	454	bci->usb.type = POWER_SUPPLY_TYPE_USB;
	455	bci->usb.properties = twl4030_charger_props;
	456	bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
	457	bci->usb.get_property = twl4030_bci_get_property;
	458
	459	ret = power_supply_register(&pdev->dev, &bci->usb);
	460	if (ret) {
	461	dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
	462	goto fail_register_usb;
	463	}
	464
	465	ret = request_threaded_irq(bci->irq_chg, NULL,
	466	twl4030_charger_interrupt, 0, pdev->name, bci);
	467	if (ret < 0) {
	468	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	469	bci->irq_chg, ret);
	470	goto fail_chg_irq;
	471	}
	472
	473	ret = request_threaded_irq(bci->irq_bci, NULL,
	474	twl4030_bci_interrupt, 0, pdev->name, bci);
	475	if (ret < 0) {
	476	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	477	bci->irq_bci, ret);
	478	goto fail_bci_irq;
	479	}
	480
d6ccc442 HK	481	INIT_WORK(&bci->work, twl4030_bci_usb_work);
d6ccc442 HK	482
662dca54	483	bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
ded017ee	484	if (!IS_ERR_OR_NULL(bci->transceiver)) {
fcc8ebc9 HK	485	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
fcc8ebc9 HK	486	usb_register_notifier(bci->transceiver, &bci->usb_nb);
2e727f17 GI	487	}
	488
	489	/* Enable interrupts now. */
28d48f04	490	reg = ~(u32)(TWL4030_ICHGLOW \| TWL4030_ICHGEOC \| TWL4030_TBATOR2 \|
2e727f17 GI	491	TWL4030_TBATOR1 \| TWL4030_BATSTS);
	492	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	493	TWL4030_INTERRUPTS_BCIIMR1A);
	494	if (ret < 0) {
	495	dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	496	goto fail_unmask_interrupts;
	497	}
	498
28d48f04	499	reg = ~(u32)(TWL4030_VBATOV \| TWL4030_VBUSOV \| TWL4030_ACCHGOV);
2e727f17 GI	500	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	501	TWL4030_INTERRUPTS_BCIIMR2A);
	502	if (ret < 0)
	503	dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	504
	505	twl4030_charger_enable_ac(true);
	506	twl4030_charger_enable_usb(bci, true);
	507
	508	return 0;
	509
	510	fail_unmask_interrupts:
ded017ee	511	if (!IS_ERR_OR_NULL(bci->transceiver)) {
fcc8ebc9	512	usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
721002ec	513	usb_put_phy(bci->transceiver);
2e727f17 GI	514	}
	515	free_irq(bci->irq_bci, bci);
	516	fail_bci_irq:
	517	free_irq(bci->irq_chg, bci);
	518	fail_chg_irq:
	519	power_supply_unregister(&bci->usb);
	520	fail_register_usb:
	521	power_supply_unregister(&bci->ac);
	522	fail_register_ac:
	523	platform_set_drvdata(pdev, NULL);
	524	kfree(bci);
	525
	526	return ret;
	527	}
	528
	529	static int __exit twl4030_bci_remove(struct platform_device *pdev)
	530	{
	531	struct twl4030_bci *bci = platform_get_drvdata(pdev);
	532
	533	twl4030_charger_enable_ac(false);
	534	twl4030_charger_enable_usb(bci, false);
	535
	536	/* mask interrupts */
	537	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	538	TWL4030_INTERRUPTS_BCIIMR1A);
	539	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	540	TWL4030_INTERRUPTS_BCIIMR2A);
	541
ded017ee	542	if (!IS_ERR_OR_NULL(bci->transceiver)) {
fcc8ebc9	543	usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
721002ec	544	usb_put_phy(bci->transceiver);
2e727f17 GI	545	}
	546	free_irq(bci->irq_bci, bci);
	547	free_irq(bci->irq_chg, bci);
	548	power_supply_unregister(&bci->usb);
	549	power_supply_unregister(&bci->ac);
	550	platform_set_drvdata(pdev, NULL);
	551	kfree(bci);
	552
	553	return 0;
	554	}
	555
	556	static struct platform_driver twl4030_bci_driver = {
	557	.driver = {
	558	.name = "twl4030_bci",
	559	.owner = THIS_MODULE,
	560	},
	561	.remove = __exit_p(twl4030_bci_remove),
	562	};
	563
	564	static int __init twl4030_bci_init(void)
	565	{
	566	return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
	567	}
	568	module_init(twl4030_bci_init);
	569
	570	static void __exit twl4030_bci_exit(void)
	571	{
	572	platform_driver_unregister(&twl4030_bci_driver);
	573	}
	574	module_exit(twl4030_bci_exit);
	575
28d48f04	576	MODULE_AUTHOR("Gražvydas Ignotas");
2e727f17 GI	577	MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
	578	MODULE_LICENSE("GPL");
	579	MODULE_ALIAS("platform:twl4030_bci");