[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/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_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	0b1100
#define TWL4030_BBSEL_2V5	0b0000
#define TWL4030_BBSEL_3V0	0b0100
#define TWL4030_BBSEL_3V1	0b1000
#define TWL4030_BBSEL_3V2	0b1100
#define TWL4030_BBISEL_MASK	0b11
#define TWL4030_BBISEL_25uA	0b00
#define TWL4030_BBISEL_150uA	0b01
#define TWL4030_BBISEL_500uA	0b10
#define TWL4030_BBISEL_1000uA	0b11

/* 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, 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(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 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;
		}

		/* 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;
}

/*
 * 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(TWL4030_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(TWL4030_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;

	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_transceiver();
	if (bci->transceiver != NULL) {
		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 (bci->transceiver != NULL) {
		usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
		usb_put_transceiver(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 (bci->transceiver != NULL) {
		usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
		usb_put_transceiver(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>
	18	#include <linux/platform_device.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/i2c/twl.h>
	21	#include <linux/power_supply.h>
	22	#include <linux/notifier.h>
	23	#include <linux/usb/otg.h>
	24
	25	#define TWL4030_BCIMSTATEC 0x02
	26	#define TWL4030_BCIICHG 0x08
	27	#define TWL4030_BCIVAC 0x0a
	28	#define TWL4030_BCIVBUS 0x0c
	29	#define TWL4030_BCIMFSTS4 0x10
	30	#define TWL4030_BCICTL1 0x23
210d4bc8	31	#define TWL4030_BB_CFG 0x12
2e727f17 GI	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)
210d4bc8 N	41	#define TWL4030_BBCHEN BIT(4)
	42	#define TWL4030_BBSEL_MASK 0b1100
	43	#define TWL4030_BBSEL_2V5 0b0000
	44	#define TWL4030_BBSEL_3V0 0b0100
	45	#define TWL4030_BBSEL_3V1 0b1000
	46	#define TWL4030_BBSEL_3V2 0b1100
	47	#define TWL4030_BBISEL_MASK 0b11
	48	#define TWL4030_BBISEL_25uA 0b00
	49	#define TWL4030_BBISEL_150uA 0b01
	50	#define TWL4030_BBISEL_500uA 0b10
	51	#define TWL4030_BBISEL_1000uA 0b11
2e727f17 GI	52
	53	/* BCI interrupts */
	54	#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
	55	#define TWL4030_TMOVF BIT(1) /* Timer overflow */
	56	#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
	57	#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
	58	#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
	59	#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
	60	#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
	61	#define TWL4030_BATSTS BIT(7) /* Battery status */
	62
	63	#define TWL4030_VBATLVL BIT(0) /* VBAT level */
	64	#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
	65	#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
	66	#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
	67
	68	#define TWL4030_MSTATEC_USB BIT(4)
	69	#define TWL4030_MSTATEC_AC BIT(5)
	70	#define TWL4030_MSTATEC_MASK 0x0f
	71	#define TWL4030_MSTATEC_QUICK1 0x02
	72	#define TWL4030_MSTATEC_QUICK7 0x07
	73	#define TWL4030_MSTATEC_COMPLETE1 0x0b
	74	#define TWL4030_MSTATEC_COMPLETE4 0x0e
	75
	76	static bool allow_usb;
28d48f04	77	module_param(allow_usb, bool, 0644);
2e727f17 GI	78	MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
	79
	80	struct twl4030_bci {
	81	struct device *dev;
	82	struct power_supply ac;
	83	struct power_supply usb;
86753811	84	struct usb_phy *transceiver;
fcc8ebc9	85	struct notifier_block usb_nb;
d6ccc442	86	struct work_struct work;
2e727f17 GI	87	int irq_chg;
2e727f17 GI	88	int irq_bci;
d6ccc442 HK	89
d6ccc442 HK	90	unsigned long event;
2e727f17 GI	91	};
	92
	93	/*
	94	* clear and set bits on an given register on a given module
	95	*/
	96	static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
	97	{
	98	u8 val = 0;
	99	int ret;
	100
	101	ret = twl_i2c_read_u8(mod_no, &val, reg);
	102	if (ret)
	103	return ret;
	104
	105	val &= ~clear;
	106	val \|= set;
	107
	108	return twl_i2c_write_u8(mod_no, val, reg);
	109	}
	110
	111	static int twl4030_bci_read(u8 reg, u8 *val)
	112	{
	113	return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
	114	}
	115
	116	static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
	117	{
9c645d2f	118	return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
2e727f17 GI	119	TWL4030_CONFIG_DONE \| TWL4030_BCIAUTOWEN \| set,
	120	TWL4030_PM_MASTER_BOOT_BCI);
	121	}
	122
	123	static int twl4030bci_read_adc_val(u8 reg)
	124	{
	125	int ret, temp;
	126	u8 val;
	127
	128	/* read MSB */
	129	ret = twl4030_bci_read(reg + 1, &val);
	130	if (ret)
	131	return ret;
	132
	133	temp = (int)(val & 0x03) << 8;
	134
	135	/* read LSB */
	136	ret = twl4030_bci_read(reg, &val);
	137	if (ret)
	138	return ret;
	139
	140	return temp \| val;
	141	}
	142
	143	/*
	144	* Check if VBUS power is present
	145	*/
	146	static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
	147	{
	148	int ret;
	149	u8 hwsts;
	150
	151	ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
	152	TWL4030_PM_MASTER_STS_HW_CONDITIONS);
	153	if (ret < 0)
	154	return 0;
	155
	156	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
	157
	158	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
	159	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
	160	return 1;
	161
	162	return 0;
	163	}
	164
	165	/*
9c645d2f	166	* Enable/Disable USB Charge functionality.
2e727f17 GI	167	*/
	168	static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
	169	{
	170	int ret;
	171
	172	if (enable) {
9c645d2f	173	/* Check for USB charger connected */
2e727f17 GI	174	if (!twl4030_bci_have_vbus(bci))
	175	return -ENODEV;
	176
	177	/*
	178	* Until we can find out what current the device can provide,
	179	* require a module param to enable USB charging.
	180	*/
	181	if (!allow_usb) {
	182	dev_warn(bci->dev, "USB charging is disabled.\n");
	183	return -EACCES;
	184	}
	185
	186	/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
	187	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
	188	if (ret < 0)
	189	return ret;
	190
	191	/* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
	192	ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
	193	TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
	194	} else {
	195	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
	196	}
	197
	198	return ret;
	199	}
	200
	201	/*
	202	* Enable/Disable AC Charge funtionality.
	203	*/
	204	static int twl4030_charger_enable_ac(bool enable)
	205	{
	206	int ret;
	207
	208	if (enable)
	209	ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
	210	else
	211	ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
	212
	213	return ret;
	214	}
	215
210d4bc8 N	216	/*
	217	* Enable/Disable charging of Backup Battery.
	218	*/
	219	static int twl4030_charger_enable_backup(int uvolt, int uamp)
	220	{
	221	int ret;
	222	u8 flags;
	223
	224	if (uvolt < 2500000 \|\|
	225	uamp < 25) {
	226	/* disable charging of backup battery */
	227	ret = twl4030_clear_set(TWL4030_MODULE_PM_RECEIVER,
	228	TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
	229	return ret;
	230	}
	231
	232	flags = TWL4030_BBCHEN;
	233	if (uvolt >= 3200000)
	234	flags \|= TWL4030_BBSEL_3V2;
	235	else if (uvolt >= 3100000)
	236	flags \|= TWL4030_BBSEL_3V1;
	237	else if (uvolt >= 3000000)
	238	flags \|= TWL4030_BBSEL_3V0;
	239	else
	240	flags \|= TWL4030_BBSEL_2V5;
	241
	242	if (uamp >= 1000)
	243	flags \|= TWL4030_BBISEL_1000uA;
	244	else if (uamp >= 500)
	245	flags \|= TWL4030_BBISEL_500uA;
	246	else if (uamp >= 150)
	247	flags \|= TWL4030_BBISEL_150uA;
	248	else
	249	flags \|= TWL4030_BBISEL_25uA;
	250
	251	ret = twl4030_clear_set(TWL4030_MODULE_PM_RECEIVER,
	252	TWL4030_BBSEL_MASK \| TWL4030_BBISEL_MASK,
	253	flags,
	254	TWL4030_BB_CFG);
	255
	256	return ret;
	257	}
	258
2e727f17 GI	259	/*
	260	* TWL4030 CHG_PRES (AC charger presence) events
	261	*/
	262	static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
	263	{
	264	struct twl4030_bci *bci = arg;
	265
	266	dev_dbg(bci->dev, "CHG_PRES irq\n");
	267	power_supply_changed(&bci->ac);
	268	power_supply_changed(&bci->usb);
	269
	270	return IRQ_HANDLED;
	271	}
	272
	273	/*
	274	* TWL4030 BCI monitoring events
	275	*/
	276	static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
	277	{
	278	struct twl4030_bci *bci = arg;
	279	u8 irqs1, irqs2;
	280	int ret;
	281
	282	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
	283	TWL4030_INTERRUPTS_BCIISR1A);
	284	if (ret < 0)
	285	return IRQ_HANDLED;
	286
	287	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
	288	TWL4030_INTERRUPTS_BCIISR2A);
	289	if (ret < 0)
	290	return IRQ_HANDLED;
	291
	292	dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
	293
	294	if (irqs1 & (TWL4030_ICHGLOW \| TWL4030_ICHGEOC)) {
	295	/* charger state change, inform the core */
	296	power_supply_changed(&bci->ac);
	297	power_supply_changed(&bci->usb);
	298	}
	299
	300	/* various monitoring events, for now we just log them here */
	301	if (irqs1 & (TWL4030_TBATOR2 \| TWL4030_TBATOR1))
	302	dev_warn(bci->dev, "battery temperature out of range\n");
	303
	304	if (irqs1 & TWL4030_BATSTS)
	305	dev_crit(bci->dev, "battery disconnected\n");
	306
	307	if (irqs2 & TWL4030_VBATOV)
	308	dev_crit(bci->dev, "VBAT overvoltage\n");
	309
	310	if (irqs2 & TWL4030_VBUSOV)
	311	dev_crit(bci->dev, "VBUS overvoltage\n");
	312
	313	if (irqs2 & TWL4030_ACCHGOV)
	314	dev_crit(bci->dev, "Ac charger overvoltage\n");
	315
	316	return IRQ_HANDLED;
	317	}
	318
d6ccc442	319	static void twl4030_bci_usb_work(struct work_struct *data)
2e727f17	320	{
d6ccc442	321	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
2e727f17	322
d6ccc442	323	switch (bci->event) {
2e727f17 GI	324	case USB_EVENT_VBUS:
	325	case USB_EVENT_CHARGER:
	326	twl4030_charger_enable_usb(bci, true);
	327	break;
	328	case USB_EVENT_NONE:
	329	twl4030_charger_enable_usb(bci, false);
	330	break;
	331	}
d6ccc442 HK	332	}
	333
	334	static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
	335	void *priv)
	336	{
fcc8ebc9	337	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
d6ccc442 HK	338
	339	dev_dbg(bci->dev, "OTG notify %lu\n", val);
	340
	341	bci->event = val;
	342	schedule_work(&bci->work);
2e727f17 GI	343
	344	return NOTIFY_OK;
	345	}
	346
	347	/*
	348	* TI provided formulas:
	349	* CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
	350	* CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
	351	* Here we use integer approximation of:
	352	* CGAIN == 0: val * 1.6618 - 0.85
	353	* CGAIN == 1: (val * 1.6618 - 0.85) * 2
	354	*/
	355	static int twl4030_charger_get_current(void)
	356	{
	357	int curr;
	358	int ret;
	359	u8 bcictl1;
	360
	361	curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
	362	if (curr < 0)
	363	return curr;
	364
	365	ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
	366	if (ret)
	367	return ret;
	368
	369	ret = (curr * 16618 - 850 * 10000) / 10;
	370	if (bcictl1 & TWL4030_CGAIN)
	371	ret *= 2;
	372
	373	return ret;
	374	}
	375
	376	/*
	377	* Returns the main charge FSM state
	378	* Or < 0 on failure.
	379	*/
	380	static int twl4030bci_state(struct twl4030_bci *bci)
	381	{
	382	int ret;
	383	u8 state;
	384
	385	ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
	386	if (ret) {
	387	pr_err("twl4030_bci: error reading BCIMSTATEC\n");
	388	return ret;
	389	}
	390
	391	dev_dbg(bci->dev, "state: %02x\n", state);
	392
	393	return state;
	394	}
	395
	396	static int twl4030_bci_state_to_status(int state)
	397	{
	398	state &= TWL4030_MSTATEC_MASK;
	399	if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
	400	return POWER_SUPPLY_STATUS_CHARGING;
	401	else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
	402	state <= TWL4030_MSTATEC_COMPLETE4)
	403	return POWER_SUPPLY_STATUS_FULL;
	404	else
	405	return POWER_SUPPLY_STATUS_NOT_CHARGING;
	406	}
407
408	static int twl4030_bci_get_property(struct power_supply *psy,
409	enum power_supply_property psp,
410	union power_supply_propval *val)
411	{
412	struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
413	int is_charging;
414	int state;
415	int ret;
416
417	state = twl4030bci_state(bci);
418	if (state < 0)
419	return state;
420
421	if (psy->type == POWER_SUPPLY_TYPE_USB)
422	is_charging = state & TWL4030_MSTATEC_USB;
423	else
424	is_charging = state & TWL4030_MSTATEC_AC;
425
426	switch (psp) {
427	case POWER_SUPPLY_PROP_STATUS:
428	if (is_charging)
429	val->intval = twl4030_bci_state_to_status(state);
430	else
431	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
432	break;
433	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
434	/* charging must be active for meaningful result */
435	if (!is_charging)
436	return -ENODATA;
437	if (psy->type == POWER_SUPPLY_TYPE_USB) {
438	ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
439	if (ret < 0)
440	return ret;
441	/* BCIVBUS uses ADCIN8, 7/1023 V/step */
442	val->intval = ret * 6843;
443	} else {
444	ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
445	if (ret < 0)
446	return ret;
447	/* BCIVAC uses ADCIN11, 10/1023 V/step */
448	val->intval = ret * 9775;
449	}
450	break;
451	case POWER_SUPPLY_PROP_CURRENT_NOW:
452	if (!is_charging)
453	return -ENODATA;
454	/* current measurement is shared between AC and USB */
455	ret = twl4030_charger_get_current();
456	if (ret < 0)
457	return ret;
458	val->intval = ret;
459	break;
460	case POWER_SUPPLY_PROP_ONLINE:
461	val->intval = is_charging &&
462	twl4030_bci_state_to_status(state) !=
463	POWER_SUPPLY_STATUS_NOT_CHARGING;
464	break;
465	default:
466	return -EINVAL;
467	}
468
469	return 0;
470	}
471
472	static enum power_supply_property twl4030_charger_props[] = {
473	POWER_SUPPLY_PROP_STATUS,
474	POWER_SUPPLY_PROP_ONLINE,
475	POWER_SUPPLY_PROP_VOLTAGE_NOW,
476	POWER_SUPPLY_PROP_CURRENT_NOW,
477	};
478
479	static int __init twl4030_bci_probe(struct platform_device *pdev)
480	{
481	struct twl4030_bci *bci;
210d4bc8	482	struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
2e727f17	483	int ret;
28d48f04	484	u32 reg;
2e727f17 GI	485
	486	bci = kzalloc(sizeof(*bci), GFP_KERNEL);
	487	if (bci == NULL)
	488	return -ENOMEM;
	489
	490	bci->dev = &pdev->dev;
	491	bci->irq_chg = platform_get_irq(pdev, 0);
	492	bci->irq_bci = platform_get_irq(pdev, 1);
	493
	494	platform_set_drvdata(pdev, bci);
	495
	496	bci->ac.name = "twl4030_ac";
	497	bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
	498	bci->ac.properties = twl4030_charger_props;
	499	bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
	500	bci->ac.get_property = twl4030_bci_get_property;
	501
	502	ret = power_supply_register(&pdev->dev, &bci->ac);
	503	if (ret) {
	504	dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
	505	goto fail_register_ac;
	506	}
	507
	508	bci->usb.name = "twl4030_usb";
	509	bci->usb.type = POWER_SUPPLY_TYPE_USB;
	510	bci->usb.properties = twl4030_charger_props;
	511	bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
	512	bci->usb.get_property = twl4030_bci_get_property;
	513
	514	ret = power_supply_register(&pdev->dev, &bci->usb);
	515	if (ret) {
	516	dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
	517	goto fail_register_usb;
	518	}
	519
	520	ret = request_threaded_irq(bci->irq_chg, NULL,
	521	twl4030_charger_interrupt, 0, pdev->name, bci);
	522	if (ret < 0) {
	523	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	524	bci->irq_chg, ret);
	525	goto fail_chg_irq;
	526	}
	527
	528	ret = request_threaded_irq(bci->irq_bci, NULL,
	529	twl4030_bci_interrupt, 0, pdev->name, bci);
	530	if (ret < 0) {
	531	dev_err(&pdev->dev, "could not request irq %d, status %d\n",
	532	bci->irq_bci, ret);
	533	goto fail_bci_irq;
	534	}
	535
d6ccc442 HK	536	INIT_WORK(&bci->work, twl4030_bci_usb_work);
d6ccc442 HK	537
fcc8ebc9	538	bci->transceiver = usb_get_transceiver();
2e727f17	539	if (bci->transceiver != NULL) {
fcc8ebc9 HK	540	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
fcc8ebc9 HK	541	usb_register_notifier(bci->transceiver, &bci->usb_nb);
2e727f17 GI	542	}
	543
	544	/* Enable interrupts now. */
28d48f04	545	reg = ~(u32)(TWL4030_ICHGLOW \| TWL4030_ICHGEOC \| TWL4030_TBATOR2 \|
2e727f17 GI	546	TWL4030_TBATOR1 \| TWL4030_BATSTS);
	547	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	548	TWL4030_INTERRUPTS_BCIIMR1A);
	549	if (ret < 0) {
	550	dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	551	goto fail_unmask_interrupts;
	552	}
	553
28d48f04	554	reg = ~(u32)(TWL4030_VBATOV \| TWL4030_VBUSOV \| TWL4030_ACCHGOV);
2e727f17 GI	555	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
	556	TWL4030_INTERRUPTS_BCIIMR2A);
	557	if (ret < 0)
	558	dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
	559
	560	twl4030_charger_enable_ac(true);
	561	twl4030_charger_enable_usb(bci, true);
210d4bc8 N	562	twl4030_charger_enable_backup(pdata->bb_uvolt,
210d4bc8 N	563	pdata->bb_uamp);
2e727f17 GI	564
	565	return 0;
	566
	567	fail_unmask_interrupts:
	568	if (bci->transceiver != NULL) {
fcc8ebc9 HK	569	usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
fcc8ebc9 HK	570	usb_put_transceiver(bci->transceiver);
2e727f17 GI	571	}
	572	free_irq(bci->irq_bci, bci);
	573	fail_bci_irq:
	574	free_irq(bci->irq_chg, bci);
	575	fail_chg_irq:
	576	power_supply_unregister(&bci->usb);
	577	fail_register_usb:
	578	power_supply_unregister(&bci->ac);
	579	fail_register_ac:
	580	platform_set_drvdata(pdev, NULL);
	581	kfree(bci);
	582
	583	return ret;
	584	}
	585
	586	static int __exit twl4030_bci_remove(struct platform_device *pdev)
	587	{
	588	struct twl4030_bci *bci = platform_get_drvdata(pdev);
	589
	590	twl4030_charger_enable_ac(false);
	591	twl4030_charger_enable_usb(bci, false);
210d4bc8	592	twl4030_charger_enable_backup(0, 0);
2e727f17 GI	593
	594	/* mask interrupts */
	595	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	596	TWL4030_INTERRUPTS_BCIIMR1A);
	597	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
	598	TWL4030_INTERRUPTS_BCIIMR2A);
	599
	600	if (bci->transceiver != NULL) {
fcc8ebc9 HK	601	usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
fcc8ebc9 HK	602	usb_put_transceiver(bci->transceiver);
2e727f17 GI	603	}
	604	free_irq(bci->irq_bci, bci);
	605	free_irq(bci->irq_chg, bci);
	606	power_supply_unregister(&bci->usb);
	607	power_supply_unregister(&bci->ac);
	608	platform_set_drvdata(pdev, NULL);
	609	kfree(bci);
	610
	611	return 0;
	612	}
	613
	614	static struct platform_driver twl4030_bci_driver = {
	615	.driver = {
	616	.name = "twl4030_bci",
	617	.owner = THIS_MODULE,
	618	},
	619	.remove = __exit_p(twl4030_bci_remove),
	620	};
	621
	622	static int __init twl4030_bci_init(void)
	623	{
	624	return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
	625	}
	626	module_init(twl4030_bci_init);
	627
	628	static void __exit twl4030_bci_exit(void)
	629	{
	630	platform_driver_unregister(&twl4030_bci_driver);
	631	}
	632	module_exit(twl4030_bci_exit);
	633
28d48f04	634	MODULE_AUTHOR("Gražvydas Ignotas");
2e727f17 GI	635	MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
	636	MODULE_LICENSE("GPL");
	637	MODULE_ALIAS("platform:twl4030_bci");