[net-next-2.6.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_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, 1);
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 otg_transceiver	*transceiver;
	struct notifier_block	otg_nb;
	int			irq_chg;
	int			irq_bci;
};

/*
 * 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 int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
			       void *priv)
{
	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);

	dev_dbg(bci->dev, "OTG notify %lu\n", val);

	switch (val) {
	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;
	}

	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;
	int 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;
	}

	bci->transceiver = otg_get_transceiver();
	if (bci->transceiver != NULL) {
		bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
		otg_register_notifier(bci->transceiver, &bci->otg_nb);
	}

	/* Enable interrupts now. */
	reg = ~(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 = ~(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 (bci->transceiver != NULL) {
		otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
		otg_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);

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