[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->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
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	82	struct lp8727_psy {
297d716f KK	83	struct power_supply *ac;
	84	struct power_supply *usb;
	85	struct power_supply *batt;
2165c8a4 WK	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
297d716f KK	245	power_supply_changed(pchg->psy->ac);
	246	power_supply_changed(pchg->psy->usb);
	247	power_supply_changed(pchg->psy->batt);
2165c8a4 WK	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	{
297d716f	314	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
2165c8a4	315
b59c93c0 KM	316	if (psp != POWER_SUPPLY_PROP_ONLINE)
	317	return -EINVAL;
	318
297d716f	319	val->intval = lp8727_is_charger_attached(psy->desc->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	{
297d716f	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:
297d716f	347	if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
e06374b0 KM	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	{
297d716f	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
20414e2e KM	408	/* skip if no charger exists */
297d716f	409	if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
20414e2e KM	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
297d716f KK	421	static const struct power_supply_desc lp8727_ac_desc = {
	422	.name = "ac",
	423	.type = POWER_SUPPLY_TYPE_MAINS,
	424	.properties = lp8727_charger_prop,
	425	.num_properties = ARRAY_SIZE(lp8727_charger_prop),
	426	.get_property = lp8727_charger_get_property,
	427	};
	428
	429	static const struct power_supply_desc lp8727_usb_desc = {
	430	.name = "usb",
	431	.type = POWER_SUPPLY_TYPE_USB,
	432	.properties = lp8727_charger_prop,
	433	.num_properties = ARRAY_SIZE(lp8727_charger_prop),
	434	.get_property = lp8727_charger_get_property,
	435	};
	436
	437	static const struct power_supply_desc lp8727_batt_desc = {
	438	.name = "main_batt",
	439	.type = POWER_SUPPLY_TYPE_BATTERY,
	440	.properties = lp8727_battery_prop,
	441	.num_properties = ARRAY_SIZE(lp8727_battery_prop),
	442	.get_property = lp8727_battery_get_property,
	443	.external_power_changed = lp8727_charger_changed,
	444	};
	445
2165c8a4 WK	446	static int lp8727_register_psy(struct lp8727_chg *pchg)
2165c8a4 WK	447	{
2dc9215d	448	struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
2165c8a4 WK	449	struct lp8727_psy *psy;
2165c8a4 WK	450
74727c57	451	psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
2165c8a4	452	if (!psy)
6297b5e5	453	return -ENOMEM;
2165c8a4 WK	454
	455	pchg->psy = psy;
	456
2dc9215d KK	457	psy_cfg.supplied_to = battery_supplied_to;
	458	psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
	459
297d716f KK	460	psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
297d716f KK	461	if (IS_ERR(psy->ac))
6297b5e5	462	goto err_psy_ac;
2165c8a4	463
297d716f KK	464	psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
	465	&psy_cfg);
	466	if (IS_ERR(psy->usb))
6297b5e5	467	goto err_psy_usb;
2165c8a4	468
297d716f KK	469	psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
297d716f KK	470	if (IS_ERR(psy->batt))
6297b5e5	471	goto err_psy_batt;
2165c8a4 WK	472
	473	return 0;
	474
6297b5e5	475	err_psy_batt:
297d716f	476	power_supply_unregister(psy->usb);
6297b5e5	477	err_psy_usb:
297d716f	478	power_supply_unregister(psy->ac);
6297b5e5	479	err_psy_ac:
2165c8a4 WK	480	return -EPERM;
	481	}
	482
	483	static void lp8727_unregister_psy(struct lp8727_chg *pchg)
	484	{
	485	struct lp8727_psy *psy = pchg->psy;
	486
ce09affc KM	487	if (!psy)
	488	return;
	489
297d716f KK	490	power_supply_unregister(psy->ac);
	491	power_supply_unregister(psy->usb);
	492	power_supply_unregister(psy->batt);
2165c8a4 WK	493	}
2165c8a4 WK	494
17b4565b KM	495	#ifdef CONFIG_OF
	496	static struct lp8727_chg_param
	497	lp8727_parse_charge_pdata(struct device dev, struct device_node *np)
	498	{
	499	struct lp8727_chg_param *param;
	500
	501	param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
	502	if (!param)
	503	goto out;
	504
	505	of_property_read_u8(np, "eoc-level", (u8 *)&param->eoc_level);
	506	of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
	507	out:
	508	return param;
	509	}
	510
87d931d5	511	static struct lp8727_platform_data lp8727_parse_dt(struct device dev)
17b4565b KM	512	{
	513	struct device_node *np = dev->of_node;
	514	struct device_node *child;
	515	struct lp8727_platform_data *pdata;
	516	const char *type;
	517
17b4565b KM	518	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
17b4565b KM	519	if (!pdata)
87d931d5	520	return ERR_PTR(-ENOMEM);
17b4565b KM	521
	522	of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
	523
9615a299 MK	524	/* If charging parameter is not defined, just skip parsing the dt */
	525	if (of_get_child_count(np) == 0)
	526	return pdata;
	527
17b4565b KM	528	for_each_child_of_node(np, child) {
	529	of_property_read_string(child, "charger-type", &type);
	530
	531	if (!strcmp(type, "ac"))
	532	pdata->ac = lp8727_parse_charge_pdata(dev, child);
	533
	534	if (!strcmp(type, "usb"))
	535	pdata->usb = lp8727_parse_charge_pdata(dev, child);
	536	}
	537
87d931d5	538	return pdata;
17b4565b KM	539	}
17b4565b KM	540	#else
87d931d5	541	static struct lp8727_platform_data lp8727_parse_dt(struct device dev)
17b4565b	542	{
87d931d5	543	return NULL;
17b4565b KM	544	}
	545	#endif
	546
2165c8a4 WK	547	static int lp8727_probe(struct i2c_client cl, const struct i2c_device_id id)
	548	{
	549	struct lp8727_chg *pchg;
87d931d5	550	struct lp8727_platform_data *pdata;
2165c8a4 WK	551	int ret;
2165c8a4 WK	552
998a8e7a KM	553	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
	554	return -EIO;
	555
17b4565b	556	if (cl->dev.of_node) {
87d931d5 MK	557	pdata = lp8727_parse_dt(&cl->dev);
	558	if (IS_ERR(pdata))
	559	return PTR_ERR(pdata);
	560	} else {
	561	pdata = dev_get_platdata(&cl->dev);
17b4565b KM	562	}
17b4565b KM	563
74727c57	564	pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
2165c8a4 WK	565	if (!pchg)
	566	return -ENOMEM;
	567
	568	pchg->client = cl;
	569	pchg->dev = &cl->dev;
87d931d5	570	pchg->pdata = pdata;
2165c8a4 WK	571	i2c_set_clientdata(cl, pchg);
	572
	573	mutex_init(&pchg->xfer_lock);
	574
7da6334e KM	575	ret = lp8727_init_device(pchg);
	576	if (ret) {
	577	dev_err(pchg->dev, "i2c communication err: %d", ret);
fb9adc51	578	return ret;
7da6334e KM	579	}
7da6334e KM	580
fb9adc51	581	ret = lp8727_register_psy(pchg);
7da6334e	582	if (ret) {
fb9adc51 KM	583	dev_err(pchg->dev, "power supplies register err: %d", ret);
fb9adc51 KM	584	return ret;
7da6334e	585	}
2165c8a4	586
d71fda01	587	ret = lp8727_setup_irq(pchg);
7da6334e	588	if (ret) {
fb9adc51 KM	589	dev_err(pchg->dev, "irq handler err: %d", ret);
	590	lp8727_unregister_psy(pchg);
	591	return ret;
7da6334e	592	}
2165c8a4 WK	593
	594	return 0;
	595	}
	596
415ec69f	597	static int lp8727_remove(struct i2c_client *cl)
2165c8a4 WK	598	{
	599	struct lp8727_chg *pchg = i2c_get_clientdata(cl);
	600
d71fda01	601	lp8727_release_irq(pchg);
fb9adc51	602	lp8727_unregister_psy(pchg);
2165c8a4 WK	603	return 0;
	604	}
	605
17b4565b KM	606	static const struct of_device_id lp8727_dt_ids[] = {
	607	{ .compatible = "ti,lp8727", },
	608	{ }
	609	};
	610	MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
	611
2165c8a4 WK	612	static const struct i2c_device_id lp8727_ids[] = {
2165c8a4 WK	613	{"lp8727", 0},
455a0e2c	614	{ }
2165c8a4	615	};
e2c5f7db	616	MODULE_DEVICE_TABLE(i2c, lp8727_ids);
2165c8a4 WK	617
	618	static struct i2c_driver lp8727_driver = {
	619	.driver = {
	620	.name = "lp8727",
17b4565b	621	.of_match_table = of_match_ptr(lp8727_dt_ids),
2165c8a4 WK	622	},
2165c8a4 WK	623	.probe = lp8727_probe,
28ea73f4	624	.remove = lp8727_remove,
2165c8a4 WK	625	.id_table = lp8727_ids,
2165c8a4 WK	626	};
5ff92e7a	627	module_i2c_driver(lp8727_driver);
2165c8a4	628
e39b828f	629	MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
18259cac	630	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
2165c8a4	631	MODULE_LICENSE("GPL");