[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_BCIMFSTS3	0x0F
#define TWL4030_BCIMFSTS4	0x10
#define TWL4030_BCICTL1		0x23
#define TWL4030_BB_CFG		0x12

#define TWL4030_BCIMFSTS1	0x01

#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

#define TWL4030_BATSTSPCHG	BIT(2)
#define TWL4030_BATSTSMCHG	BIT(6)

/* 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;
	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 Battery Pack was present
 */
static int twl4030_is_battery_present(struct twl4030_bci *bci)
{
	int ret;
	u8 val = 0;

	/* Battery presence in Main charge? */
	ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
	if (ret)
		return ret;
	if (val & TWL4030_BATSTSMCHG)
		return 0;

	/*
	 * OK, It could be that bootloader did not enable main charger,
	 * pre-charge is h/w auto. So, Battery presence in Pre-charge?
	 */
	ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
			      TWL4030_BCIMFSTS1);
	if (ret)
		return ret;
	if (val & TWL4030_BATSTSPCHG)
		return 0;

	return -ENODEV;
}

/*
 * 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 && !IS_ERR_OR_NULL(bci->transceiver)) {
		/* 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 phy powered */
		if (!bci->usb_enabled) {
			pm_runtime_get_sync(bci->transceiver->dev);
			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) {
			pm_runtime_mark_last_busy(bci->transceiver->dev);
			pm_runtime_put_autosuspend(bci->transceiver->dev);
			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->desc->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->desc->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 const struct power_supply_desc twl4030_bci_ac_desc = {
	.name		= "twl4030_ac",
	.type		= POWER_SUPPLY_TYPE_MAINS,
	.properties	= twl4030_charger_props,
	.num_properties	= ARRAY_SIZE(twl4030_charger_props),
	.get_property	= twl4030_bci_get_property,
};

static const struct power_supply_desc twl4030_bci_usb_desc = {
	.name		= "twl4030_usb",
	.type		= POWER_SUPPLY_TYPE_USB,
	.properties	= twl4030_charger_props,
	.num_properties	= ARRAY_SIZE(twl4030_charger_props),
	.get_property	= twl4030_bci_get_property,
};

static int 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 = devm_kzalloc(&pdev->dev, 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);

	/* Only proceed further *IF* battery is physically present */
	ret = twl4030_is_battery_present(bci);
	if  (ret) {
		dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, bci);

	bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
					     NULL);
	if (IS_ERR(bci->ac)) {
		ret = PTR_ERR(bci->ac);
		dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
		return ret;
	}

	bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
					      NULL);
	if (IS_ERR(bci->usb)) {
		ret = PTR_ERR(bci->usb);
		dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, 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);
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, 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);
		return ret;
	}

	INIT_WORK(&bci->work, twl4030_bci_usb_work);

	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
	if (bci->dev->of_node) {
		struct device_node *phynode;

		phynode = of_find_compatible_node(bci->dev->of_node->parent,
						  NULL, "ti,twl4030-usb");
		if (phynode) {
			bci->transceiver = devm_usb_get_phy_by_node(
				bci->dev, phynode, &bci->usb_nb);
			if (IS_ERR(bci->transceiver) &&
			    PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
				return -EPROBE_DEFER;
		}
	}

	/* 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);
		return ret;
	}

	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);
	if (pdata)
		twl4030_charger_enable_backup(pdata->bb_uvolt,
					      pdata->bb_uamp);
	else
		twl4030_charger_enable_backup(0, 0);

	return 0;
}

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);

	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 = {
	.probe = twl4030_bci_probe,
	.driver	= {
		.name	= "twl4030_bci",
		.of_match_table = of_match_ptr(twl_bci_of_match),
	},
	.remove	= __exit_p(twl4030_bci_remove),
};
module_platform_driver(twl4030_bci_driver);

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
61a7784e	30	#define TWL4030_BCIMFSTS3 0x0F
2e727f17 GI	31	#define TWL4030_BCIMFSTS4 0x10
2e727f17 GI	32	#define TWL4030_BCICTL1 0x23
210d4bc8	33	#define TWL4030_BB_CFG 0x12
2e727f17	34
61a7784e NM	35	#define TWL4030_BCIMFSTS1 0x01
61a7784e NM	36
2e727f17 GI	37	#define TWL4030_BCIAUTOWEN BIT(5)
	38	#define TWL4030_CONFIG_DONE BIT(4)
	39	#define TWL4030_BCIAUTOUSB BIT(1)
	40	#define TWL4030_BCIAUTOAC BIT(0)
	41	#define TWL4030_CGAIN BIT(5)
	42	#define TWL4030_USBFASTMCHG BIT(2)
	43	#define TWL4030_STS_VBUS BIT(7)
	44	#define TWL4030_STS_USB_ID BIT(2)
210d4bc8	45	#define TWL4030_BBCHEN BIT(4)
94b05cab IH	46	#define TWL4030_BBSEL_MASK 0x0c
	47	#define TWL4030_BBSEL_2V5 0x00
	48	#define TWL4030_BBSEL_3V0 0x04
	49	#define TWL4030_BBSEL_3V1 0x08
	50	#define TWL4030_BBSEL_3V2 0x0c
	51	#define TWL4030_BBISEL_MASK 0x03
	52	#define TWL4030_BBISEL_25uA 0x00
	53	#define TWL4030_BBISEL_150uA 0x01
	54	#define TWL4030_BBISEL_500uA 0x02
	55	#define TWL4030_BBISEL_1000uA 0x03
2e727f17	56
61a7784e NM	57	#define TWL4030_BATSTSPCHG BIT(2)
	58	#define TWL4030_BATSTSMCHG BIT(6)
	59
2e727f17 GI	60	/* BCI interrupts */
	61	#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
	62	#define TWL4030_TMOVF BIT(1) /* Timer overflow */
	63	#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
	64	#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
	65	#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
	66	#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
	67	#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
	68	#define TWL4030_BATSTS BIT(7) /* Battery status */
	69
	70	#define TWL4030_VBATLVL BIT(0) /* VBAT level */
	71	#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
	72	#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
	73	#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
	74
	75	#define TWL4030_MSTATEC_USB BIT(4)
	76	#define TWL4030_MSTATEC_AC BIT(5)
	77	#define TWL4030_MSTATEC_MASK 0x0f
	78	#define TWL4030_MSTATEC_QUICK1 0x02
	79	#define TWL4030_MSTATEC_QUICK7 0x07
	80	#define TWL4030_MSTATEC_COMPLETE1 0x0b
	81	#define TWL4030_MSTATEC_COMPLETE4 0x0e
	82
	83	static bool allow_usb;
28d48f04	84	module_param(allow_usb, bool, 0644);
2e727f17 GI	85	MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
	86
	87	struct twl4030_bci {
	88	struct device *dev;
297d716f KK	89	struct power_supply *ac;
297d716f KK	90	struct power_supply *usb;
86753811	91	struct usb_phy *transceiver;
fcc8ebc9	92	struct notifier_block usb_nb;
d6ccc442	93	struct work_struct work;
2e727f17 GI	94	int irq_chg;
2e727f17 GI	95	int irq_bci;
ab37813f	96	int usb_enabled;
d6ccc442 HK	97
d6ccc442 HK	98	unsigned long event;
2e727f17 GI	99	};
	100
	101	/*
	102	* clear and set bits on an given register on a given module
	103	*/
	104	static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
	105	{
	106	u8 val = 0;
	107	int ret;
	108
	109	ret = twl_i2c_read_u8(mod_no, &val, reg);
	110	if (ret)
	111	return ret;
	112
	113	val &= ~clear;
	114	val \|= set;
	115
	116	return twl_i2c_write_u8(mod_no, val, reg);
	117	}
	118
	119	static int twl4030_bci_read(u8 reg, u8 *val)
	120	{
e9f14c18	121	return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
2e727f17 GI	122	}
	123
	124	static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
	125	{
e9f14c18	126	return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
2e727f17 GI	127	TWL4030_CONFIG_DONE \| TWL4030_BCIAUTOWEN \| set,
	128	TWL4030_PM_MASTER_BOOT_BCI);
	129	}
	130
	131	static int twl4030bci_read_adc_val(u8 reg)
	132	{
	133	int ret, temp;
	134	u8 val;
	135
	136	/* read MSB */
	137	ret = twl4030_bci_read(reg + 1, &val);
	138	if (ret)
	139	return ret;
	140
	141	temp = (int)(val & 0x03) << 8;
	142
	143	/* read LSB */
	144	ret = twl4030_bci_read(reg, &val);
	145	if (ret)
	146	return ret;
	147
	148	return temp \| val;
	149	}
	150
61a7784e NM	151	/*
	152	* Check if Battery Pack was present
	153	*/
	154	static int twl4030_is_battery_present(struct twl4030_bci *bci)
	155	{
	156	int ret;
	157	u8 val = 0;
	158
	159	/* Battery presence in Main charge? */
	160	ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
	161	if (ret)
	162	return ret;
	163	if (val & TWL4030_BATSTSMCHG)
	164	return 0;
	165
	166	/*
	167	* OK, It could be that bootloader did not enable main charger,
	168	* pre-charge is h/w auto. So, Battery presence in Pre-charge?
	169	*/
	170	ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
	171	TWL4030_BCIMFSTS1);
	172	if (ret)
	173	return ret;
	174	if (val & TWL4030_BATSTSPCHG)
	175	return 0;
	176
	177	return -ENODEV;
	178	}
	179
2e727f17 GI	180	/*
	181	* Check if VBUS power is present
	182	*/
	183	static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
	184	{
	185	int ret;
	186	u8 hwsts;
	187
e9f14c18	188	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
2e727f17 GI	189	TWL4030_PM_MASTER_STS_HW_CONDITIONS);
	190	if (ret < 0)
	191	return 0;
	192
	193	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
	194
	195	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
	196	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
	197	return 1;
	198
	199	return 0;
	200	}
	201
	202	/*
9c645d2f	203	* Enable/Disable USB Charge functionality.
2e727f17 GI	204	*/
	205	static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
	206	{
	207	int ret;
	208
e57c4a67	209	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
9c645d2f	210	/* Check for USB charger connected */
2e727f17 GI	211	if (!twl4030_bci_have_vbus(bci))
	212	return -ENODEV;
	213
	214	/*
	215	* Until we can find out what current the device can provide,
	216	* require a module param to enable USB charging.
	217	*/
	218	if (!allow_usb) {
	219	dev_warn(bci->dev, "USB charging is disabled.\n");
	220	return -EACCES;
	221	}
	222
e57c4a67	223	/* Need to keep phy powered */
ab37813f	224	if (!bci->usb_enabled) {
e57c4a67	225	pm_runtime_get_sync(bci->transceiver->dev);
ab37813f N	226	bci->usb_enabled = 1;
	227	}
	228
2e727f17 GI	229	/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
	230	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
	231	if (ret < 0)
	232	return ret;
	233
	234	/* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
e9f14c18	235	ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
2e727f17 GI	236	TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
	237	} else {
	238	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
ab37813f	239	if (bci->usb_enabled) {
e57c4a67 N	240	pm_runtime_mark_last_busy(bci->transceiver->dev);
e57c4a67 N	241	pm_runtime_put_autosuspend(bci->transceiver->dev);
ab37813f N	242	bci->usb_enabled = 0;
ab37813f N	243	}
2e727f17 GI	244	}
	245
	246	return ret;
	247	}
	248
	249	/*
	250	* Enable/Disable AC Charge funtionality.
	251	*/
	252	static int twl4030_charger_enable_ac(bool enable)
	253	{
	254	int ret;
	255
	256	if (enable)
	257	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
	258	else
	259	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
	260
	261	return ret;
	262	}
	263
210d4bc8 N	264	/*
	265	* Enable/Disable charging of Backup Battery.
	266	*/
	267	static int twl4030_charger_enable_backup(int uvolt, int uamp)
	268	{
	269	int ret;
	270	u8 flags;
	271
	272	if (uvolt < 2500000 \|\|
	273	uamp < 25) {
	274	/* disable charging of backup battery */
e9f14c18	275	ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
210d4bc8 N	276	TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
	277	return ret;
	278	}
	279
	280	flags = TWL4030_BBCHEN;
	281	if (uvolt >= 3200000)
	282	flags \|= TWL4030_BBSEL_3V2;
	283	else if (uvolt >= 3100000)
	284	flags \|= TWL4030_BBSEL_3V1;
	285	else if (uvolt >= 3000000)
	286	flags \|= TWL4030_BBSEL_3V0;
	287	else
	288	flags \|= TWL4030_BBSEL_2V5;
	289
	290	if (uamp >= 1000)
	291	flags \|= TWL4030_BBISEL_1000uA;
	292	else if (uamp >= 500)
	293	flags \|= TWL4030_BBISEL_500uA;
	294	else if (uamp >= 150)
	295	flags \|= TWL4030_BBISEL_150uA;
	296	else
	297	flags \|= TWL4030_BBISEL_25uA;
	298
e9f14c18	299	ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
210d4bc8 N	300	TWL4030_BBSEL_MASK \| TWL4030_BBISEL_MASK,
	301	flags,
	302	TWL4030_BB_CFG);
	303
	304	return ret;
	305	}
	306
2e727f17 GI	307	/*
	308	* TWL4030 CHG_PRES (AC charger presence) events
	309	*/
	310	static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
	311	{
	312	struct twl4030_bci *bci = arg;
	313
	314	dev_dbg(bci->dev, "CHG_PRES irq\n");
297d716f KK	315	power_supply_changed(bci->ac);
297d716f KK	316	power_supply_changed(bci->usb);
2e727f17 GI	317
	318	return IRQ_HANDLED;
	319	}
	320
	321	/*
	322	* TWL4030 BCI monitoring events
	323	*/
	324	static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
	325	{
	326	struct twl4030_bci *bci = arg;
	327	u8 irqs1, irqs2;
	328	int ret;
	329
	330	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
	331	TWL4030_INTERRUPTS_BCIISR1A);
	332	if (ret < 0)
	333	return IRQ_HANDLED;
	334
	335	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
	336	TWL4030_INTERRUPTS_BCIISR2A);
	337	if (ret < 0)
	338	return IRQ_HANDLED;
	339
	340	dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
	341
	342	if (irqs1 & (TWL4030_ICHGLOW \| TWL4030_ICHGEOC)) {
	343	/* charger state change, inform the core */
297d716f KK	344	power_supply_changed(bci->ac);
297d716f KK	345	power_supply_changed(bci->usb);
2e727f17 GI	346	}
	347
	348	/* various monitoring events, for now we just log them here */
	349	if (irqs1 & (TWL4030_TBATOR2 \| TWL4030_TBATOR1))
	350	dev_warn(bci->dev, "battery temperature out of range\n");
	351
	352	if (irqs1 & TWL4030_BATSTS)
	353	dev_crit(bci->dev, "battery disconnected\n");
	354
	355	if (irqs2 & TWL4030_VBATOV)
	356	dev_crit(bci->dev, "VBAT overvoltage\n");
	357
	358	if (irqs2 & TWL4030_VBUSOV)
	359	dev_crit(bci->dev, "VBUS overvoltage\n");
	360
	361	if (irqs2 & TWL4030_ACCHGOV)
	362	dev_crit(bci->dev, "Ac charger overvoltage\n");
	363
	364	return IRQ_HANDLED;
	365	}
	366
d6ccc442	367	static void twl4030_bci_usb_work(struct work_struct *data)
2e727f17	368	{
d6ccc442	369	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
2e727f17	370
d6ccc442	371	switch (bci->event) {
2e727f17 GI	372	case USB_EVENT_VBUS:
	373	case USB_EVENT_CHARGER:
	374	twl4030_charger_enable_usb(bci, true);
	375	break;
	376	case USB_EVENT_NONE:
	377	twl4030_charger_enable_usb(bci, false);
	378	break;
	379	}
d6ccc442 HK	380	}
	381
	382	static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
	383	void *priv)
	384	{
fcc8ebc9	385	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
d6ccc442 HK	386
	387	dev_dbg(bci->dev, "OTG notify %lu\n", val);
	388
	389	bci->event = val;
	390	schedule_work(&bci->work);
2e727f17 GI	391
	392	return NOTIFY_OK;
	393	}
	394
	395	/*
	396	* TI provided formulas:
	397	* CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
	398	* CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
	399	* Here we use integer approximation of:
	400	* CGAIN == 0: val * 1.6618 - 0.85
	401	* CGAIN == 1: (val * 1.6618 - 0.85) * 2
	402	*/
	403	static int twl4030_charger_get_current(void)
	404	{
	405	int curr;
	406	int ret;
	407	u8 bcictl1;
	408
	409	curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
	410	if (curr < 0)
	411	return curr;
	412
	413	ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
	414	if (ret)
	415	return ret;
	416
	417	ret = (curr * 16618 - 850 * 10000) / 10;
	418	if (bcictl1 & TWL4030_CGAIN)
	419	ret *= 2;
	420
	421	return ret;
	422	}
	423
	424	/*
	425	* Returns the main charge FSM state
	426	* Or < 0 on failure.
	427	*/
	428	static int twl4030bci_state(struct twl4030_bci *bci)
	429	{
	430	int ret;
	431	u8 state;
	432
	433	ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
	434	if (ret) {
	435	pr_err("twl4030_bci: error reading BCIMSTATEC\n");
	436	return ret;
	437	}
	438
	439	dev_dbg(bci->dev, "state: %02x\n", state);
	440
	441	return state;
	442	}
	443
	444	static int twl4030_bci_state_to_status(int state)
	445	{
	446	state &= TWL4030_MSTATEC_MASK;
	447	if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
	448	return POWER_SUPPLY_STATUS_CHARGING;
	449	else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
	450	state <= TWL4030_MSTATEC_COMPLETE4)
	451	return POWER_SUPPLY_STATUS_FULL;
	452	else
	453	return POWER_SUPPLY_STATUS_NOT_CHARGING;
	454	}
455
456	static int twl4030_bci_get_property(struct power_supply *psy,
457	enum power_supply_property psp,
458	union power_supply_propval *val)
459	{
297d716f	460	struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
2e727f17 GI	461	int is_charging;
	462	int state;
	463	int ret;
	464
	465	state = twl4030bci_state(bci);
	466	if (state < 0)
	467	return state;
	468
297d716f	469	if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
2e727f17 GI	470	is_charging = state & TWL4030_MSTATEC_USB;
	471	else
	472	is_charging = state & TWL4030_MSTATEC_AC;
	473
	474	switch (psp) {
	475	case POWER_SUPPLY_PROP_STATUS:
	476	if (is_charging)
	477	val->intval = twl4030_bci_state_to_status(state);
	478	else
	479	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	480	break;
	481	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	482	/* charging must be active for meaningful result */
	483	if (!is_charging)
	484	return -ENODATA;
297d716f	485	if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
2e727f17 GI	486	ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
	487	if (ret < 0)
	488	return ret;
	489	/* BCIVBUS uses ADCIN8, 7/1023 V/step */
	490	val->intval = ret * 6843;
	491	} else {
	492	ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
	493	if (ret < 0)
	494	return ret;
	495	/* BCIVAC uses ADCIN11, 10/1023 V/step */
	496	val->intval = ret * 9775;
	497	}
	498	break;
	499	case POWER_SUPPLY_PROP_CURRENT_NOW:
	500	if (!is_charging)
	501	return -ENODATA;
	502	/* current measurement is shared between AC and USB */
	503	ret = twl4030_charger_get_current();
	504	if (ret < 0)
	505	return ret;
	506	val->intval = ret;
	507	break;
	508	case POWER_SUPPLY_PROP_ONLINE:
	509	val->intval = is_charging &&
	510	twl4030_bci_state_to_status(state) !=
	511	POWER_SUPPLY_STATUS_NOT_CHARGING;
	512	break;
	513	default:
	514	return -EINVAL;
	515	}
	516
	517	return 0;
	518	}
	519
	520	static enum power_supply_property twl4030_charger_props[] = {
	521	POWER_SUPPLY_PROP_STATUS,
	522	POWER_SUPPLY_PROP_ONLINE,
	523	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	524	POWER_SUPPLY_PROP_CURRENT_NOW,
	525	};
	526
ec0b3802 N	527	#ifdef CONFIG_OF
	528	static const struct twl4030_bci_platform_data *
	529	twl4030_bci_parse_dt(struct device *dev)
	530	{
	531	struct device_node *np = dev->of_node;
	532	struct twl4030_bci_platform_data *pdata;
	533	u32 num;
	534
	535	if (!np)
	536	return NULL;
	537	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	538	if (!pdata)
	539	return pdata;
	540
	541	if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
	542	pdata->bb_uvolt = num;
	543	if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
	544	pdata->bb_uamp = num;
	545	return pdata;
	546	}
	547	#else
	548	static inline const struct twl4030_bci_platform_data *
	549	twl4030_bci_parse_dt(struct device *dev)
	550	{
	551	return NULL;
	552	}
	553	#endif
	554
297d716f KK	555	static const struct power_supply_desc twl4030_bci_ac_desc = {
	556	.name = "twl4030_ac",
	557	.type = POWER_SUPPLY_TYPE_MAINS,
	558	.properties = twl4030_charger_props,
	559	.num_properties = ARRAY_SIZE(twl4030_charger_props),
	560	.get_property = twl4030_bci_get_property,
	561	};
	562
	563	static const struct power_supply_desc twl4030_bci_usb_desc = {
	564	.name = "twl4030_usb",
	565	.type = POWER_SUPPLY_TYPE_USB,
	566	.properties = twl4030_charger_props,
	567	.num_properties = ARRAY_SIZE(twl4030_charger_props),
	568	.get_property = twl4030_bci_get_property,
	569	};
	570
7396f708	571	static int twl4030_bci_probe(struct platform_device *pdev)
2e727f17 GI	572	{
2e727f17 GI	573	struct twl4030_bci *bci;
ec0b3802	574	const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
2e727f17	575	int ret;
28d48f04	576	u32 reg;
2e727f17	577
325b50aa	578	bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
2e727f17 GI	579	if (bci == NULL)
	580	return -ENOMEM;
	581
ec0b3802 N	582	if (!pdata)
	583	pdata = twl4030_bci_parse_dt(&pdev->dev);
	584
2e727f17 GI	585	bci->dev = &pdev->dev;
	586	bci->irq_chg = platform_get_irq(pdev, 0);
	587	bci->irq_bci = platform_get_irq(pdev, 1);
	588
61a7784e NM	589	/* Only proceed further IF battery is physically present */
	590	ret = twl4030_is_battery_present(bci);
	591	if (ret) {
	592	dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
325b50aa	593	return ret;
61a7784e	594	}
2e727f17	595
61a7784e	596	platform_set_drvdata(pdev, bci);
2e727f17	597
325b50aa N	598	bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
325b50aa N	599	NULL);
297d716f KK	600	if (IS_ERR(bci->ac)) {
297d716f KK	601	ret = PTR_ERR(bci->ac);
2e727f17	602	dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
325b50aa	603	return ret;
2e727f17 GI	604	}
2e727f17 GI	605
325b50aa N	606	bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
325b50aa N	607	NULL);
297d716f KK	608	if (IS_ERR(bci->usb)) {
297d716f KK	609	ret = PTR_ERR(bci->usb);
2e727f17	610	dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
325b50aa	611	return ret;
2e727f17 GI	612	}
2e727f17 GI	613
1b7cac23	614	ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
a2778b0f FW	615	twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
a2778b0f FW	616	bci);
2e727f17 GI	617	if (ret < 0) {
	618	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	619	bci->irq_chg, ret);
325b50aa	620	return ret;
2e727f17 GI	621	}
2e727f17 GI	622
1b7cac23	623	ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
a2778b0f	624	twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
2e727f17 GI	625	if (ret < 0) {
	626	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	627	bci->irq_bci, ret);
325b50aa	628	return ret;
2e727f17 GI	629	}
2e727f17 GI	630
d6ccc442 HK	631	INIT_WORK(&bci->work, twl4030_bci_usb_work);
d6ccc442 HK	632
f5e4edb8 N	633	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
	634	if (bci->dev->of_node) {
	635	struct device_node *phynode;
	636
	637	phynode = of_find_compatible_node(bci->dev->of_node->parent,
	638	NULL, "ti,twl4030-usb");
3fc3895e	639	if (phynode) {
f5e4edb8 N	640	bci->transceiver = devm_usb_get_phy_by_node(
f5e4edb8 N	641	bci->dev, phynode, &bci->usb_nb);
3fc3895e N	642	if (IS_ERR(bci->transceiver) &&
	643	PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
	644	return -EPROBE_DEFER;
	645	}
2e727f17 GI	646	}
	647
	648	/* Enable interrupts now. */
28d48f04	649	reg = ~(u32)(TWL4030_ICHGLOW \| TWL4030_ICHGEOC \| TWL4030_TBATOR2 \|
2e727f17 GI	650	TWL4030_TBATOR1 \| TWL4030_BATSTS);
	651	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	652	TWL4030_INTERRUPTS_BCIIMR1A);
	653	if (ret < 0) {
	654	dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
325b50aa	655	return ret;
2e727f17 GI	656	}
2e727f17 GI	657
28d48f04	658	reg = ~(u32)(TWL4030_VBATOV \| TWL4030_VBUSOV \| TWL4030_ACCHGOV);
2e727f17 GI	659	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	660	TWL4030_INTERRUPTS_BCIIMR2A);
	661	if (ret < 0)
	662	dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	663
	664	twl4030_charger_enable_ac(true);
	665	twl4030_charger_enable_usb(bci, true);
ec0b3802 N	666	if (pdata)
	667	twl4030_charger_enable_backup(pdata->bb_uvolt,
	668	pdata->bb_uamp);
	669	else
	670	twl4030_charger_enable_backup(0, 0);
2e727f17 GI	671
2e727f17 GI	672	return 0;
2e727f17 GI	673	}
	674
	675	static int __exit twl4030_bci_remove(struct platform_device *pdev)
	676	{
	677	struct twl4030_bci *bci = platform_get_drvdata(pdev);
	678
	679	twl4030_charger_enable_ac(false);
	680	twl4030_charger_enable_usb(bci, false);
210d4bc8	681	twl4030_charger_enable_backup(0, 0);
2e727f17 GI	682
	683	/* mask interrupts */
	684	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	685	TWL4030_INTERRUPTS_BCIIMR1A);
	686	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	687	TWL4030_INTERRUPTS_BCIIMR2A);
	688
2e727f17 GI	689	return 0;
	690	}
	691
ec0b3802 N	692	static const struct of_device_id twl_bci_of_match[] = {
	693	{.compatible = "ti,twl4030-bci", },
	694	{ }
	695	};
	696	MODULE_DEVICE_TABLE(of, twl_bci_of_match);
	697
2e727f17	698	static struct platform_driver twl4030_bci_driver = {
7396f708	699	.probe = twl4030_bci_probe,
2e727f17 GI	700	.driver = {
2e727f17 GI	701	.name = "twl4030_bci",
ec0b3802	702	.of_match_table = of_match_ptr(twl_bci_of_match),
2e727f17 GI	703	},
	704	.remove = __exit_p(twl4030_bci_remove),
	705	};
7396f708	706	module_platform_driver(twl4030_bci_driver);
2e727f17	707
28d48f04	708	MODULE_AUTHOR("Gražvydas Ignotas");
2e727f17 GI	709	MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
	710	MODULE_LICENSE("GPL");
	711	MODULE_ALIAS("platform:twl4030_bci");