[linux-2.6-block.git] / drivers / power / lp8727_charger.c

/*
 * Driver for LP8727 Micro/Mini USB IC with integrated charger
 *
 *			Copyright (C) 2011 Texas Instruments
 *			Copyright (C) 2011 National Semiconductor
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#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->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->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->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 int lp8727_register_psy(struct lp8727_chg *pchg)
{
	struct lp8727_psy *psy;

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

	pchg->psy = psy;

	psy->ac.name = "ac";
	psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
	psy->ac.properties = lp8727_charger_prop;
	psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
	psy->ac.get_property = lp8727_charger_get_property;
	psy->ac.supplied_to = battery_supplied_to;
	psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);

	if (power_supply_register(pchg->dev, &psy->ac))
		goto err_psy_ac;

	psy->usb.name = "usb";
	psy->usb.type = POWER_SUPPLY_TYPE_USB;
	psy->usb.properties = lp8727_charger_prop;
	psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
	psy->usb.get_property = lp8727_charger_get_property;
	psy->usb.supplied_to = battery_supplied_to;
	psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);

	if (power_supply_register(pchg->dev, &psy->usb))
		goto err_psy_usb;

	psy->batt.name = "main_batt";
	psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
	psy->batt.properties = lp8727_battery_prop;
	psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
	psy->batt.get_property = lp8727_battery_get_property;
	psy->batt.external_power_changed = lp8727_charger_changed;

	if (power_supply_register(pchg->dev, &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 int 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;

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

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

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

	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);
	}

	dev->platform_data = pdata;
out:
	return 0;
}
#else
static int lp8727_parse_dt(struct device *dev)
{
	return 0;
}
#endif

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

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

	if (cl->dev.of_node) {
		ret = lp8727_parse_dt(&cl->dev);
		if (ret)
			return ret;
	}

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

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