[thirdparty/kernel/stable.git] / drivers / power / supply / lp8727_charger.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for LP8727 Micro/Mini USB IC with integrated charger
 *
 *			Copyright (C) 2011 Texas Instruments
 *			Copyright (C) 2011 National Semiconductor
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/power_supply.h>
#include <linux/platform_data/lp8727.h>
#include <linux/of.h>

#define LP8788_NUM_INTREGS	2
#define DEFAULT_DEBOUNCE_MSEC	270

/* Registers */
#define LP8727_CTRL1		0x1
#define LP8727_CTRL2		0x2
#define LP8727_SWCTRL		0x3
#define LP8727_INT1		0x4
#define LP8727_INT2		0x5
#define LP8727_STATUS1		0x6
#define LP8727_STATUS2		0x7
#define LP8727_CHGCTRL2		0x9

/* CTRL1 register */
#define LP8727_CP_EN		BIT(0)
#define LP8727_ADC_EN		BIT(1)
#define LP8727_ID200_EN		BIT(4)

/* CTRL2 register */
#define LP8727_CHGDET_EN	BIT(1)
#define LP8727_INT_EN		BIT(6)

/* SWCTRL register */
#define LP8727_SW_DM1_DM	(0x0 << 0)
#define LP8727_SW_DM1_HiZ	(0x7 << 0)
#define LP8727_SW_DP2_DP	(0x0 << 3)
#define LP8727_SW_DP2_HiZ	(0x7 << 3)

/* INT1 register */
#define LP8727_IDNO		(0xF << 0)
#define LP8727_VBUS		BIT(4)

/* STATUS1 register */
#define LP8727_CHGSTAT		(3 << 4)
#define LP8727_CHPORT		BIT(6)
#define LP8727_DCPORT		BIT(7)
#define LP8727_STAT_EOC		0x30

/* STATUS2 register */
#define LP8727_TEMP_STAT	(3 << 5)
#define LP8727_TEMP_SHIFT	5

/* CHGCTRL2 register */
#define LP8727_ICHG_SHIFT	4

enum lp8727_dev_id {
	LP8727_ID_NONE,
	LP8727_ID_TA,
	LP8727_ID_DEDICATED_CHG,
	LP8727_ID_USB_CHG,
	LP8727_ID_USB_DS,
	LP8727_ID_MAX,
};

enum lp8727_die_temp {
	LP8788_TEMP_75C,
	LP8788_TEMP_95C,
	LP8788_TEMP_115C,
	LP8788_TEMP_135C,
};

struct lp8727_psy {
	struct power_supply *ac;
	struct power_supply *usb;
	struct power_supply *batt;
};

struct lp8727_chg {
	struct device *dev;
	struct i2c_client *client;
	struct mutex xfer_lock;
	struct lp8727_psy *psy;
	struct lp8727_platform_data *pdata;

	/* Charger Data */
	enum lp8727_dev_id devid;
	struct lp8727_chg_param *chg_param;

	/* Interrupt Handling */
	int irq;
	struct delayed_work work;
	unsigned long debounce_jiffies;
};

static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
{
	s32 ret;

	mutex_lock(&pchg->xfer_lock);
	ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
	mutex_unlock(&pchg->xfer_lock);

	return (ret != len) ? -EIO : 0;
}

static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
{
	return lp8727_read_bytes(pchg, reg, data, 1);
}

static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
{
	int ret;

	mutex_lock(&pchg->xfer_lock);
	ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
	mutex_unlock(&pchg->xfer_lock);

	return ret;
}

static bool lp8727_is_charger_attached(const char *name, int id)
{
	if (!strcmp(name, "ac"))
		return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
	else if (!strcmp(name, "usb"))
		return id == LP8727_ID_USB_CHG;

	return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
}

static int lp8727_init_device(struct lp8727_chg *pchg)
{
	u8 val;
	int ret;
	u8 intstat[LP8788_NUM_INTREGS];

	/* clear interrupts */
	ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
	if (ret)
		return ret;

	val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
	ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
	if (ret)
		return ret;

	val = LP8727_INT_EN | LP8727_CHGDET_EN;
	return lp8727_write_byte(pchg, LP8727_CTRL2, val);
}

static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
{
	u8 val;

	lp8727_read_byte(pchg, LP8727_STATUS1, &val);
	return val & LP8727_DCPORT;
}

static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
{
	u8 val;

	lp8727_read_byte(pchg, LP8727_STATUS1, &val);
	return val & LP8727_CHPORT;
}

static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
{
	lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
}

static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
{
	struct lp8727_platform_data *pdata = pchg->pdata;
	u8 devid = LP8727_ID_NONE;
	u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;

	switch (id) {
	case 0x5:
		devid = LP8727_ID_TA;
		pchg->chg_param = pdata ? pdata->ac : NULL;
		break;
	case 0xB:
		if (lp8727_is_dedicated_charger(pchg)) {
			pchg->chg_param = pdata ? pdata->ac : NULL;
			devid = LP8727_ID_DEDICATED_CHG;
		} else if (lp8727_is_usb_charger(pchg)) {
			pchg->chg_param = pdata ? pdata->usb : NULL;
			devid = LP8727_ID_USB_CHG;
			swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
		} else if (vbusin) {
			devid = LP8727_ID_USB_DS;
			swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
		}
		break;
	default:
		devid = LP8727_ID_NONE;
		pchg->chg_param = NULL;
		break;
	}

	pchg->devid = devid;
	lp8727_ctrl_switch(pchg, swctrl);
}

static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
{
	u8 val;

	lp8727_read_byte(pchg, LP8727_CTRL2, &val);
	val |= LP8727_CHGDET_EN;
	lp8727_write_byte(pchg, LP8727_CTRL2, val);
}

static void lp8727_delayed_func(struct work_struct *_work)
{
	struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
						work.work);
	u8 intstat[LP8788_NUM_INTREGS];
	u8 idno;
	u8 vbus;

	if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
		dev_err(pchg->dev, "can not read INT registers\n");
		return;
	}

	idno = intstat[0] & LP8727_IDNO;
	vbus = intstat[0] & LP8727_VBUS;

	lp8727_id_detection(pchg, idno, vbus);
	lp8727_enable_chgdet(pchg);

	power_supply_changed(pchg->psy->ac);
	power_supply_changed(pchg->psy->usb);
	power_supply_changed(pchg->psy->batt);
}

static irqreturn_t lp8727_isr_func(int irq, void *ptr)
{
	struct lp8727_chg *pchg = ptr;

	schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
	return IRQ_HANDLED;
}

static int lp8727_setup_irq(struct lp8727_chg *pchg)
{
	int ret;
	int irq = pchg->client->irq;
	unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
						DEFAULT_DEBOUNCE_MSEC;

	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);

	if (irq <= 0) {
		dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
		return 0;
	}

	ret = request_threaded_irq(irq,	NULL, lp8727_isr_func,
				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				"lp8727_irq", pchg);

	if (ret)
		return ret;

	pchg->irq = irq;
	pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);

	return 0;
}

static void lp8727_release_irq(struct lp8727_chg *pchg)
{
	cancel_delayed_work_sync(&pchg->work);

	if (pchg->irq)
		free_irq(pchg->irq, pchg);
}

static enum power_supply_property lp8727_charger_prop[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static enum power_supply_property lp8727_battery_prop[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_TEMP,
};

static char *battery_supplied_to[] = {
	"main_batt",
};

static int lp8727_charger_get_property(struct power_supply *psy,
				       enum power_supply_property psp,
				       union power_supply_propval *val)
{
	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);

	if (psp != POWER_SUPPLY_PROP_ONLINE)
		return -EINVAL;

	val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);

	return 0;
}

static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
{
	switch (temp) {
	case LP8788_TEMP_95C:
	case LP8788_TEMP_115C:
	case LP8788_TEMP_135C:
		return true;
	default:
		return false;
	}
}

static int lp8727_battery_get_property(struct power_supply *psy,
				       enum power_supply_property psp,
				       union power_supply_propval *val)
{
	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
	struct lp8727_platform_data *pdata = pchg->pdata;
	enum lp8727_die_temp temp;
	u8 read;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
			return 0;
		}

		lp8727_read_byte(pchg, LP8727_STATUS1, &read);

		val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
				POWER_SUPPLY_STATUS_FULL :
				POWER_SUPPLY_STATUS_CHARGING;
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		lp8727_read_byte(pchg, LP8727_STATUS2, &read);
		temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;

		val->intval = lp8727_is_high_temperature(temp) ?
			POWER_SUPPLY_HEALTH_OVERHEAT :
			POWER_SUPPLY_HEALTH_GOOD;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		if (!pdata)
			return -EINVAL;

		if (pdata->get_batt_present)
			val->intval = pdata->get_batt_present();
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (!pdata)
			return -EINVAL;

		if (pdata->get_batt_level)
			val->intval = pdata->get_batt_level();
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		if (!pdata)
			return -EINVAL;

		if (pdata->get_batt_capacity)
			val->intval = pdata->get_batt_capacity();
		break;
	case POWER_SUPPLY_PROP_TEMP:
		if (!pdata)
			return -EINVAL;

		if (pdata->get_batt_temp)
			val->intval = pdata->get_batt_temp();
		break;
	default:
		break;
	}

	return 0;
}

static void lp8727_charger_changed(struct power_supply *psy)
{
	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
	u8 eoc_level;
	u8 ichg;
	u8 val;

	/* skip if no charger exists */
	if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
		return;

	/* update charging parameters */
	if (pchg->chg_param) {
		eoc_level = pchg->chg_param->eoc_level;
		ichg = pchg->chg_param->ichg;
		val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
		lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
	}
}

static const struct power_supply_desc lp8727_ac_desc = {
	.name			= "ac",
	.type			= POWER_SUPPLY_TYPE_MAINS,
	.properties		= lp8727_charger_prop,
	.num_properties		= ARRAY_SIZE(lp8727_charger_prop),
	.get_property		= lp8727_charger_get_property,
};

static const struct power_supply_desc lp8727_usb_desc = {
	.name			= "usb",
	.type			= POWER_SUPPLY_TYPE_USB,
	.properties		= lp8727_charger_prop,
	.num_properties		= ARRAY_SIZE(lp8727_charger_prop),
	.get_property		= lp8727_charger_get_property,
};

static const struct power_supply_desc lp8727_batt_desc = {
	.name			= "main_batt",
	.type			= POWER_SUPPLY_TYPE_BATTERY,
	.properties		= lp8727_battery_prop,
	.num_properties		= ARRAY_SIZE(lp8727_battery_prop),
	.get_property		= lp8727_battery_get_property,
	.external_power_changed	= lp8727_charger_changed,
};

static int lp8727_register_psy(struct lp8727_chg *pchg)
{
	struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
	struct lp8727_psy *psy;

	psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
	if (!psy)
		return -ENOMEM;

	pchg->psy = psy;

	psy_cfg.supplied_to = battery_supplied_to;
	psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);

	psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
	if (IS_ERR(psy->ac))
		goto err_psy_ac;

	psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
					 &psy_cfg);
	if (IS_ERR(psy->usb))
		goto err_psy_usb;

	psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
	if (IS_ERR(psy->batt))
		goto err_psy_batt;

	return 0;

err_psy_batt:
	power_supply_unregister(psy->usb);
err_psy_usb:
	power_supply_unregister(psy->ac);
err_psy_ac:
	return -EPERM;
}

static void lp8727_unregister_psy(struct lp8727_chg *pchg)
{
	struct lp8727_psy *psy = pchg->psy;

	if (!psy)
		return;

	power_supply_unregister(psy->ac);
	power_supply_unregister(psy->usb);
	power_supply_unregister(psy->batt);
}

#ifdef CONFIG_OF
static struct lp8727_chg_param
*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
{
	struct lp8727_chg_param *param;

	param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
	if (!param)
		goto out;

	of_property_read_u8(np, "eoc-level", (u8 *)&param->eoc_level);
	of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
out:
	return param;
}

static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct device_node *child;
	struct lp8727_platform_data *pdata;
	const char *type;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);

	/* If charging parameter is not defined, just skip parsing the dt */
	if (of_get_child_count(np) == 0)
		return pdata;

	for_each_child_of_node(np, child) {
		of_property_read_string(child, "charger-type", &type);

		if (!strcmp(type, "ac"))
			pdata->ac = lp8727_parse_charge_pdata(dev, child);

		if (!strcmp(type, "usb"))
			pdata->usb = lp8727_parse_charge_pdata(dev, child);
	}

	return pdata;
}
#else
static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
{
	return NULL;
}
#endif

static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
	struct lp8727_chg *pchg;
	struct lp8727_platform_data *pdata;
	int ret;

	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
		return -EIO;

	if (cl->dev.of_node) {
		pdata = lp8727_parse_dt(&cl->dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	} else {
		pdata = dev_get_platdata(&cl->dev);
	}

	pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
	if (!pchg)
		return -ENOMEM;

	pchg->client = cl;
	pchg->dev = &cl->dev;
	pchg->pdata = pdata;
	i2c_set_clientdata(cl, pchg);

	mutex_init(&pchg->xfer_lock);

	ret = lp8727_init_device(pchg);
	if (ret) {
		dev_err(pchg->dev, "i2c communication err: %d", ret);
		return ret;
	}

	ret = lp8727_register_psy(pchg);
	if (ret) {
		dev_err(pchg->dev, "power supplies register err: %d", ret);
		return ret;
	}

	ret = lp8727_setup_irq(pchg);
	if (ret) {
		dev_err(pchg->dev, "irq handler err: %d", ret);
		lp8727_unregister_psy(pchg);
		return ret;
	}

	return 0;
}

static int lp8727_remove(struct i2c_client *cl)
{
	struct lp8727_chg *pchg = i2c_get_clientdata(cl);

	lp8727_release_irq(pchg);
	lp8727_unregister_psy(pchg);
	return 0;
}

static const struct of_device_id lp8727_dt_ids[] = {
	{ .compatible = "ti,lp8727", },
	{ }
};
MODULE_DEVICE_TABLE(of, lp8727_dt_ids);

static const struct i2c_device_id lp8727_ids[] = {
	{"lp8727", 0},
	{ }
};
MODULE_DEVICE_TABLE(i2c, lp8727_ids);

static struct i2c_driver lp8727_driver = {
	.driver = {
		   .name = "lp8727",
		   .of_match_table = of_match_ptr(lp8727_dt_ids),
		   },
	.probe = lp8727_probe,
	.remove = lp8727_remove,
	.id_table = lp8727_ids,
};
module_i2c_driver(lp8727_driver);

MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
2165c8a4	2	/*
f7bae49a	3	* Driver for LP8727 Micro/Mini USB IC with integrated charger
2165c8a4	4	*
e39b828f	5	* Copyright (C) 2011 Texas Instruments
2165c8a4	6	* Copyright (C) 2011 National Semiconductor
2165c8a4 WK	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/slab.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/i2c.h>
	13	#include <linux/power_supply.h>
1aebb097	14	#include <linux/platform_data/lp8727.h>
17b4565b	15	#include <linux/of.h>
2165c8a4	16
638555d2	17	#define LP8788_NUM_INTREGS 2
60fd57e0	18	#define DEFAULT_DEBOUNCE_MSEC 270
2165c8a4 WK	19
2165c8a4 WK	20	/* Registers */
6029719f KM	21	#define LP8727_CTRL1 0x1
	22	#define LP8727_CTRL2 0x2
	23	#define LP8727_SWCTRL 0x3
	24	#define LP8727_INT1 0x4
	25	#define LP8727_INT2 0x5
	26	#define LP8727_STATUS1 0x6
	27	#define LP8727_STATUS2 0x7
	28	#define LP8727_CHGCTRL2 0x9
2165c8a4 WK	29
2165c8a4 WK	30	/* CTRL1 register */
6029719f KM	31	#define LP8727_CP_EN BIT(0)
	32	#define LP8727_ADC_EN BIT(1)
	33	#define LP8727_ID200_EN BIT(4)
2165c8a4 WK	34
2165c8a4 WK	35	/* CTRL2 register */
6029719f KM	36	#define LP8727_CHGDET_EN BIT(1)
6029719f KM	37	#define LP8727_INT_EN BIT(6)
2165c8a4 WK	38
2165c8a4 WK	39	/* SWCTRL register */
6029719f KM	40	#define LP8727_SW_DM1_DM (0x0 << 0)
	41	#define LP8727_SW_DM1_HiZ (0x7 << 0)
	42	#define LP8727_SW_DP2_DP (0x0 << 3)
	43	#define LP8727_SW_DP2_HiZ (0x7 << 3)
2165c8a4 WK	44
2165c8a4 WK	45	/* INT1 register */
6029719f KM	46	#define LP8727_IDNO (0xF << 0)
6029719f KM	47	#define LP8727_VBUS BIT(4)
2165c8a4 WK	48
2165c8a4 WK	49	/* STATUS1 register */
6029719f KM	50	#define LP8727_CHGSTAT (3 << 4)
	51	#define LP8727_CHPORT BIT(6)
	52	#define LP8727_DCPORT BIT(7)
	53	#define LP8727_STAT_EOC 0x30
2165c8a4 WK	54
2165c8a4 WK	55	/* STATUS2 register */
6029719f KM	56	#define LP8727_TEMP_STAT (3 << 5)
6029719f KM	57	#define LP8727_TEMP_SHIFT 5
2165c8a4	58
18763a36 KM	59	/* CHGCTRL2 register */
	60	#define LP8727_ICHG_SHIFT 4
	61
2165c8a4	62	enum lp8727_dev_id {
6029719f KM	63	LP8727_ID_NONE,
	64	LP8727_ID_TA,
	65	LP8727_ID_DEDICATED_CHG,
	66	LP8727_ID_USB_CHG,
	67	LP8727_ID_USB_DS,
	68	LP8727_ID_MAX,
2165c8a4 WK	69	};
2165c8a4 WK	70
b1ad0796 KM	71	enum lp8727_die_temp {
	72	LP8788_TEMP_75C,
	73	LP8788_TEMP_95C,
	74	LP8788_TEMP_115C,
	75	LP8788_TEMP_135C,
	76	};
	77
2165c8a4	78	struct lp8727_psy {
297d716f KK	79	struct power_supply *ac;
	80	struct power_supply *usb;
	81	struct power_supply *batt;
2165c8a4 WK	82	};
	83
	84	struct lp8727_chg {
	85	struct device *dev;
	86	struct i2c_client *client;
	87	struct mutex xfer_lock;
2165c8a4	88	struct lp8727_psy *psy;
1ae9df7d KM	89	struct lp8727_platform_data *pdata;
	90
	91	/* Charger Data */
2165c8a4	92	enum lp8727_dev_id devid;
1ae9df7d KM	93	struct lp8727_chg_param *chg_param;
	94
	95	/* Interrupt Handling */
d71fda01	96	int irq;
1ae9df7d KM	97	struct delayed_work work;
1ae9df7d KM	98	unsigned long debounce_jiffies;
2165c8a4 WK	99	};
2165c8a4 WK	100
27aefa3b	101	static int lp8727_read_bytes(struct lp8727_chg pchg, u8 reg, u8 data, u8 len)
2165c8a4 WK	102	{
	103	s32 ret;
	104
	105	mutex_lock(&pchg->xfer_lock);
	106	ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
	107	mutex_unlock(&pchg->xfer_lock);
	108
	109	return (ret != len) ? -EIO : 0;
	110	}
	111
27aefa3b	112	static inline int lp8727_read_byte(struct lp8727_chg pchg, u8 reg, u8 data)
2165c8a4	113	{
27aefa3b KM	114	return lp8727_read_bytes(pchg, reg, data, 1);
	115	}
	116
	117	static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
	118	{
	119	int ret;
2165c8a4 WK	120
2165c8a4 WK	121	mutex_lock(&pchg->xfer_lock);
27aefa3b	122	ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
2165c8a4 WK	123	mutex_unlock(&pchg->xfer_lock);
	124
	125	return ret;
	126	}
	127
65272bac	128	static bool lp8727_is_charger_attached(const char *name, int id)
2165c8a4	129	{
65272bac KM	130	if (!strcmp(name, "ac"))
	131	return id == LP8727_ID_TA \|\| id == LP8727_ID_DEDICATED_CHG;
	132	else if (!strcmp(name, "usb"))
	133	return id == LP8727_ID_USB_CHG;
	134
	135	return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
2165c8a4 WK	136	}
2165c8a4 WK	137
7da6334e	138	static int lp8727_init_device(struct lp8727_chg *pchg)
2165c8a4 WK	139	{
2165c8a4 WK	140	u8 val;
7da6334e	141	int ret;
638555d2 KM	142	u8 intstat[LP8788_NUM_INTREGS];
	143
	144	/* clear interrupts */
6029719f	145	ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
638555d2 KM	146	if (ret)
	147	return ret;
	148
6029719f KM	149	val = LP8727_ID200_EN \| LP8727_ADC_EN \| LP8727_CP_EN;
6029719f KM	150	ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
7da6334e KM	151	if (ret)
7da6334e KM	152	return ret;
2165c8a4	153
6029719f	154	val = LP8727_INT_EN \| LP8727_CHGDET_EN;
70be1305	155	return lp8727_write_byte(pchg, LP8727_CTRL2, val);
2165c8a4 WK	156	}
	157
	158	static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
	159	{
	160	u8 val;
b9633ef1	161
6029719f KM	162	lp8727_read_byte(pchg, LP8727_STATUS1, &val);
6029719f KM	163	return val & LP8727_DCPORT;
2165c8a4 WK	164	}
	165
	166	static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
	167	{
	168	u8 val;
b9633ef1	169
6029719f KM	170	lp8727_read_byte(pchg, LP8727_STATUS1, &val);
6029719f KM	171	return val & LP8727_CHPORT;
2165c8a4 WK	172	}
2165c8a4 WK	173
91a69633	174	static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
2165c8a4	175	{
6029719f	176	lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
2165c8a4 WK	177	}
	178
	179	static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
	180	{
318cb389	181	struct lp8727_platform_data *pdata = pchg->pdata;
6029719f KM	182	u8 devid = LP8727_ID_NONE;
6029719f KM	183	u8 swctrl = LP8727_SW_DM1_HiZ \| LP8727_SW_DP2_HiZ;
2165c8a4 WK	184
	185	switch (id) {
	186	case 0x5:
6029719f	187	devid = LP8727_ID_TA;
56d99ed9	188	pchg->chg_param = pdata ? pdata->ac : NULL;
2165c8a4 WK	189	break;
	190	case 0xB:
	191	if (lp8727_is_dedicated_charger(pchg)) {
56d99ed9	192	pchg->chg_param = pdata ? pdata->ac : NULL;
6029719f	193	devid = LP8727_ID_DEDICATED_CHG;
2165c8a4	194	} else if (lp8727_is_usb_charger(pchg)) {
56d99ed9	195	pchg->chg_param = pdata ? pdata->usb : NULL;
6029719f KM	196	devid = LP8727_ID_USB_CHG;
6029719f KM	197	swctrl = LP8727_SW_DM1_DM \| LP8727_SW_DP2_DP;
2165c8a4	198	} else if (vbusin) {
6029719f KM	199	devid = LP8727_ID_USB_DS;
6029719f KM	200	swctrl = LP8727_SW_DM1_DM \| LP8727_SW_DP2_DP;
2165c8a4 WK	201	}
	202	break;
	203	default:
6029719f	204	devid = LP8727_ID_NONE;
56d99ed9	205	pchg->chg_param = NULL;
2165c8a4 WK	206	break;
	207	}
	208
	209	pchg->devid = devid;
	210	lp8727_ctrl_switch(pchg, swctrl);
	211	}
	212
	213	static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
	214	{
	215	u8 val;
	216
6029719f KM	217	lp8727_read_byte(pchg, LP8727_CTRL2, &val);
	218	val \|= LP8727_CHGDET_EN;
	219	lp8727_write_byte(pchg, LP8727_CTRL2, val);
2165c8a4 WK	220	}
	221
	222	static void lp8727_delayed_func(struct work_struct *_work)
	223	{
5e00b976 KM	224	struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
	225	work.work);
	226	u8 intstat[LP8788_NUM_INTREGS];
	227	u8 idno;
	228	u8 vbus;
2165c8a4	229
18763a36	230	if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
2165c8a4 WK	231	dev_err(pchg->dev, "can not read INT registers\n");
	232	return;
	233	}
	234
6029719f KM	235	idno = intstat[0] & LP8727_IDNO;
6029719f KM	236	vbus = intstat[0] & LP8727_VBUS;
2165c8a4 WK	237
	238	lp8727_id_detection(pchg, idno, vbus);
	239	lp8727_enable_chgdet(pchg);
	240
297d716f KK	241	power_supply_changed(pchg->psy->ac);
	242	power_supply_changed(pchg->psy->usb);
	243	power_supply_changed(pchg->psy->batt);
2165c8a4 WK	244	}
	245
	246	static irqreturn_t lp8727_isr_func(int irq, void *ptr)
	247	{
	248	struct lp8727_chg *pchg = ptr;
2165c8a4	249
2a092582	250	schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
2165c8a4 WK	251	return IRQ_HANDLED;
	252	}
	253
d71fda01	254	static int lp8727_setup_irq(struct lp8727_chg *pchg)
2165c8a4	255	{
d71fda01 KM	256	int ret;
d71fda01 KM	257	int irq = pchg->client->irq;
60fd57e0 KM	258	unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
	259	DEFAULT_DEBOUNCE_MSEC;
	260
2165c8a4 WK	261	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
2165c8a4 WK	262
d71fda01 KM	263	if (irq <= 0) {
	264	dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
	265	return 0;
	266	}
60fd57e0	267
d71fda01	268	ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
7c577c0d	269	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
d71fda01 KM	270	"lp8727_irq", pchg);
	271
	272	if (ret)
	273	return ret;
	274
	275	pchg->irq = irq;
	276	pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
	277
	278	return 0;
	279	}
	280
	281	static void lp8727_release_irq(struct lp8727_chg *pchg)
	282	{
	283	cancel_delayed_work_sync(&pchg->work);
	284
	285	if (pchg->irq)
	286	free_irq(pchg->irq, pchg);
2165c8a4 WK	287	}
	288
	289	static enum power_supply_property lp8727_charger_prop[] = {
	290	POWER_SUPPLY_PROP_ONLINE,
	291	};
	292
	293	static enum power_supply_property lp8727_battery_prop[] = {
	294	POWER_SUPPLY_PROP_STATUS,
	295	POWER_SUPPLY_PROP_HEALTH,
	296	POWER_SUPPLY_PROP_PRESENT,
	297	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	298	POWER_SUPPLY_PROP_CAPACITY,
	299	POWER_SUPPLY_PROP_TEMP,
	300	};
	301
	302	static char *battery_supplied_to[] = {
	303	"main_batt",
	304	};
	305
	306	static int lp8727_charger_get_property(struct power_supply *psy,
	307	enum power_supply_property psp,
	308	union power_supply_propval *val)
	309	{
297d716f	310	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
2165c8a4	311
b59c93c0 KM	312	if (psp != POWER_SUPPLY_PROP_ONLINE)
	313	return -EINVAL;
	314
297d716f	315	val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);
2165c8a4 WK	316
	317	return 0;
	318	}
	319
b1ad0796 KM	320	static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
	321	{
	322	switch (temp) {
	323	case LP8788_TEMP_95C:
	324	case LP8788_TEMP_115C:
	325	case LP8788_TEMP_135C:
	326	return true;
	327	default:
	328	return false;
	329	}
	330	}
	331
2165c8a4 WK	332	static int lp8727_battery_get_property(struct power_supply *psy,
	333	enum power_supply_property psp,
	334	union power_supply_propval *val)
	335	{
297d716f	336	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
318cb389	337	struct lp8727_platform_data *pdata = pchg->pdata;
b1ad0796	338	enum lp8727_die_temp temp;
2165c8a4 WK	339	u8 read;
	340
	341	switch (psp) {
	342	case POWER_SUPPLY_PROP_STATUS:
297d716f	343	if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
e06374b0 KM	344	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	345	return 0;
	346	}
	347
	348	lp8727_read_byte(pchg, LP8727_STATUS1, &read);
faaae9bb	349
e06374b0	350	val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
faaae9bb KM	351	POWER_SUPPLY_STATUS_FULL :
faaae9bb KM	352	POWER_SUPPLY_STATUS_CHARGING;
2165c8a4 WK	353	break;
2165c8a4 WK	354	case POWER_SUPPLY_PROP_HEALTH:
6029719f KM	355	lp8727_read_byte(pchg, LP8727_STATUS2, &read);
6029719f KM	356	temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
b1ad0796 KM	357
	358	val->intval = lp8727_is_high_temperature(temp) ?
	359	POWER_SUPPLY_HEALTH_OVERHEAT :
	360	POWER_SUPPLY_HEALTH_GOOD;
2165c8a4 WK	361	break;
2165c8a4 WK	362	case POWER_SUPPLY_PROP_PRESENT:
318cb389 KM	363	if (!pdata)
	364	return -EINVAL;
	365
	366	if (pdata->get_batt_present)
f96b3074	367	val->intval = pdata->get_batt_present();
2165c8a4 WK	368	break;
2165c8a4 WK	369	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
318cb389 KM	370	if (!pdata)
	371	return -EINVAL;
	372
	373	if (pdata->get_batt_level)
f96b3074	374	val->intval = pdata->get_batt_level();
2165c8a4 WK	375	break;
2165c8a4 WK	376	case POWER_SUPPLY_PROP_CAPACITY:
318cb389 KM	377	if (!pdata)
	378	return -EINVAL;
	379
	380	if (pdata->get_batt_capacity)
f96b3074	381	val->intval = pdata->get_batt_capacity();
2165c8a4 WK	382	break;
2165c8a4 WK	383	case POWER_SUPPLY_PROP_TEMP:
318cb389 KM	384	if (!pdata)
	385	return -EINVAL;
	386
	387	if (pdata->get_batt_temp)
f96b3074	388	val->intval = pdata->get_batt_temp();
2165c8a4 WK	389	break;
	390	default:
	391	break;
	392	}
	393
	394	return 0;
	395	}
	396
	397	static void lp8727_charger_changed(struct power_supply *psy)
	398	{
297d716f	399	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
20414e2e KM	400	u8 eoc_level;
20414e2e KM	401	u8 ichg;
2165c8a4	402	u8 val;
20414e2e KM	403
20414e2e KM	404	/* skip if no charger exists */
297d716f	405	if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
20414e2e KM	406	return;
	407
	408	/* update charging parameters */
56d99ed9 KM	409	if (pchg->chg_param) {
	410	eoc_level = pchg->chg_param->eoc_level;
	411	ichg = pchg->chg_param->ichg;
20414e2e KM	412	val = (ichg << LP8727_ICHG_SHIFT) \| eoc_level;
20414e2e KM	413	lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
2165c8a4 WK	414	}
	415	}
	416
297d716f KK	417	static const struct power_supply_desc lp8727_ac_desc = {
	418	.name = "ac",
	419	.type = POWER_SUPPLY_TYPE_MAINS,
	420	.properties = lp8727_charger_prop,
	421	.num_properties = ARRAY_SIZE(lp8727_charger_prop),
	422	.get_property = lp8727_charger_get_property,
	423	};
	424
	425	static const struct power_supply_desc lp8727_usb_desc = {
	426	.name = "usb",
	427	.type = POWER_SUPPLY_TYPE_USB,
	428	.properties = lp8727_charger_prop,
	429	.num_properties = ARRAY_SIZE(lp8727_charger_prop),
	430	.get_property = lp8727_charger_get_property,
	431	};
	432
	433	static const struct power_supply_desc lp8727_batt_desc = {
	434	.name = "main_batt",
	435	.type = POWER_SUPPLY_TYPE_BATTERY,
	436	.properties = lp8727_battery_prop,
	437	.num_properties = ARRAY_SIZE(lp8727_battery_prop),
	438	.get_property = lp8727_battery_get_property,
	439	.external_power_changed = lp8727_charger_changed,
	440	};
	441
2165c8a4 WK	442	static int lp8727_register_psy(struct lp8727_chg *pchg)
2165c8a4 WK	443	{
2dc9215d	444	struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
2165c8a4 WK	445	struct lp8727_psy *psy;
2165c8a4 WK	446
74727c57	447	psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
2165c8a4	448	if (!psy)
6297b5e5	449	return -ENOMEM;
2165c8a4 WK	450
	451	pchg->psy = psy;
	452
2dc9215d KK	453	psy_cfg.supplied_to = battery_supplied_to;
	454	psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
	455
297d716f KK	456	psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
297d716f KK	457	if (IS_ERR(psy->ac))
6297b5e5	458	goto err_psy_ac;
2165c8a4	459
297d716f KK	460	psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
	461	&psy_cfg);
	462	if (IS_ERR(psy->usb))
6297b5e5	463	goto err_psy_usb;
2165c8a4	464
297d716f KK	465	psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
297d716f KK	466	if (IS_ERR(psy->batt))
6297b5e5	467	goto err_psy_batt;
2165c8a4 WK	468
	469	return 0;
	470
6297b5e5	471	err_psy_batt:
297d716f	472	power_supply_unregister(psy->usb);
6297b5e5	473	err_psy_usb:
297d716f	474	power_supply_unregister(psy->ac);
6297b5e5	475	err_psy_ac:
2165c8a4 WK	476	return -EPERM;
	477	}
	478
	479	static void lp8727_unregister_psy(struct lp8727_chg *pchg)
	480	{
	481	struct lp8727_psy *psy = pchg->psy;
	482
ce09affc KM	483	if (!psy)
	484	return;
	485
297d716f KK	486	power_supply_unregister(psy->ac);
	487	power_supply_unregister(psy->usb);
	488	power_supply_unregister(psy->batt);
2165c8a4 WK	489	}
2165c8a4 WK	490
17b4565b KM	491	#ifdef CONFIG_OF
	492	static struct lp8727_chg_param
	493	lp8727_parse_charge_pdata(struct device dev, struct device_node *np)
	494	{
	495	struct lp8727_chg_param *param;
	496
	497	param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
	498	if (!param)
	499	goto out;
	500
	501	of_property_read_u8(np, "eoc-level", (u8 *)&param->eoc_level);
	502	of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
	503	out:
	504	return param;
	505	}
	506
87d931d5	507	static struct lp8727_platform_data lp8727_parse_dt(struct device dev)
17b4565b KM	508	{
	509	struct device_node *np = dev->of_node;
	510	struct device_node *child;
	511	struct lp8727_platform_data *pdata;
	512	const char *type;
	513
17b4565b KM	514	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
17b4565b KM	515	if (!pdata)
87d931d5	516	return ERR_PTR(-ENOMEM);
17b4565b KM	517
	518	of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
	519
9615a299 MK	520	/* If charging parameter is not defined, just skip parsing the dt */
	521	if (of_get_child_count(np) == 0)
	522	return pdata;
	523
17b4565b KM	524	for_each_child_of_node(np, child) {
	525	of_property_read_string(child, "charger-type", &type);
	526
	527	if (!strcmp(type, "ac"))
	528	pdata->ac = lp8727_parse_charge_pdata(dev, child);
	529
	530	if (!strcmp(type, "usb"))
	531	pdata->usb = lp8727_parse_charge_pdata(dev, child);
	532	}
	533
87d931d5	534	return pdata;
17b4565b KM	535	}
17b4565b KM	536	#else
87d931d5	537	static struct lp8727_platform_data lp8727_parse_dt(struct device dev)
17b4565b	538	{
87d931d5	539	return NULL;
17b4565b KM	540	}
	541	#endif
	542
2165c8a4 WK	543	static int lp8727_probe(struct i2c_client cl, const struct i2c_device_id id)
	544	{
	545	struct lp8727_chg *pchg;
87d931d5	546	struct lp8727_platform_data *pdata;
2165c8a4 WK	547	int ret;
2165c8a4 WK	548
998a8e7a KM	549	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
	550	return -EIO;
	551
17b4565b	552	if (cl->dev.of_node) {
87d931d5 MK	553	pdata = lp8727_parse_dt(&cl->dev);
	554	if (IS_ERR(pdata))
	555	return PTR_ERR(pdata);
	556	} else {
	557	pdata = dev_get_platdata(&cl->dev);
17b4565b KM	558	}
17b4565b KM	559
74727c57	560	pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
2165c8a4 WK	561	if (!pchg)
	562	return -ENOMEM;
	563
	564	pchg->client = cl;
	565	pchg->dev = &cl->dev;
87d931d5	566	pchg->pdata = pdata;
2165c8a4 WK	567	i2c_set_clientdata(cl, pchg);
	568
	569	mutex_init(&pchg->xfer_lock);
	570
7da6334e KM	571	ret = lp8727_init_device(pchg);
	572	if (ret) {
	573	dev_err(pchg->dev, "i2c communication err: %d", ret);
fb9adc51	574	return ret;
7da6334e KM	575	}
7da6334e KM	576
fb9adc51	577	ret = lp8727_register_psy(pchg);
7da6334e	578	if (ret) {
fb9adc51 KM	579	dev_err(pchg->dev, "power supplies register err: %d", ret);
fb9adc51 KM	580	return ret;
7da6334e	581	}
2165c8a4	582
d71fda01	583	ret = lp8727_setup_irq(pchg);
7da6334e	584	if (ret) {
fb9adc51 KM	585	dev_err(pchg->dev, "irq handler err: %d", ret);
	586	lp8727_unregister_psy(pchg);
	587	return ret;
7da6334e	588	}
2165c8a4 WK	589
	590	return 0;
	591	}
	592
415ec69f	593	static int lp8727_remove(struct i2c_client *cl)
2165c8a4 WK	594	{
	595	struct lp8727_chg *pchg = i2c_get_clientdata(cl);
	596
d71fda01	597	lp8727_release_irq(pchg);
fb9adc51	598	lp8727_unregister_psy(pchg);
2165c8a4 WK	599	return 0;
	600	}
	601
17b4565b KM	602	static const struct of_device_id lp8727_dt_ids[] = {
	603	{ .compatible = "ti,lp8727", },
	604	{ }
	605	};
	606	MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
	607
2165c8a4 WK	608	static const struct i2c_device_id lp8727_ids[] = {
2165c8a4 WK	609	{"lp8727", 0},
455a0e2c	610	{ }
2165c8a4	611	};
e2c5f7db	612	MODULE_DEVICE_TABLE(i2c, lp8727_ids);
2165c8a4 WK	613
	614	static struct i2c_driver lp8727_driver = {
	615	.driver = {
	616	.name = "lp8727",
17b4565b	617	.of_match_table = of_match_ptr(lp8727_dt_ids),
2165c8a4 WK	618	},
2165c8a4 WK	619	.probe = lp8727_probe,
28ea73f4	620	.remove = lp8727_remove,
2165c8a4 WK	621	.id_table = lp8727_ids,
2165c8a4 WK	622	};
5ff92e7a	623	module_i2c_driver(lp8727_driver);
2165c8a4	624
e39b828f	625	MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
18259cac	626	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
2165c8a4	627	MODULE_LICENSE("GPL");