drivers/power/lp8727_charger.c - kernel/msm - Gitiles

 /*
  * Driver for LP8727 Micro/Mini USB IC with intergrated 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/lp8727.h>

 #define DEBOUNCE_MSEC	270

 /* Registers */
 #define CTRL1		0x1
 #define CTRL2		0x2
 #define	SWCTRL		0x3
 #define INT1		0x4
 #define INT2		0x5
 #define STATUS1		0x6
 #define STATUS2 	0x7
 #define CHGCTRL2	0x9

 /* CTRL1 register */
 #define CP_EN		(1 << 0)
 #define ADC_EN		(1 << 1)
 #define ID200_EN	(1 << 4)

 /* CTRL2 register */
 #define CHGDET_EN	(1 << 1)
 #define INT_EN		(1 << 6)

 /* SWCTRL register */
 #define SW_DM1_DM	(0x0 << 0)
 #define SW_DM1_U1	(0x1 << 0)
 #define SW_DM1_HiZ	(0x7 << 0)
 #define SW_DP2_DP	(0x0 << 3)
 #define SW_DP2_U2	(0x1 << 3)
 #define SW_DP2_HiZ	(0x7 << 3)

 /* INT1 register */
 #define IDNO		(0xF << 0)
 #define VBUS		(1 << 4)

 /* STATUS1 register */
 #define CHGSTAT		(3 << 4)
 #define CHPORT		(1 << 6)
 #define DCPORT		(1 << 7)

 /* STATUS2 register */
 #define TEMP_STAT	(3 << 5)

 enum lp8727_dev_id {
 	ID_NONE,
 	ID_TA,
 	ID_DEDICATED_CHG,
 	ID_USB_CHG,
 	ID_USB_DS,
 	ID_MAX,
 };

 enum lp8727_chg_stat {
 	PRECHG,
 	CC,
 	CV,
 	EOC,
 };

 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 delayed_work work;
 	struct workqueue_struct *irqthread;
 	struct lp8727_platform_data *pdata;
 	struct lp8727_psy *psy;
 	struct lp8727_chg_param *chg_parm;
 	enum lp8727_dev_id devid;
 };

 static int lp8727_i2c_read(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 int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
 {
 	s32 ret;

 	mutex_lock(&pchg->xfer_lock);
 	ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
 	mutex_unlock(&pchg->xfer_lock);

 	return ret;
 }

 static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
 				       u8 *data)
 {
 	return lp8727_i2c_read(pchg, reg, data, 1);
 }

 static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
 					u8 *data)
 {
 	return lp8727_i2c_write(pchg, reg, data, 1);
 }

 static int lp8727_is_charger_attached(const char *name, int id)
 {
 	if (name) {
 		if (!strcmp(name, "ac"))
 			return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
 		else if (!strcmp(name, "usb"))
 			return (id == ID_USB_CHG) ? 1 : 0;
 	}

 	return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
 }

 static int lp8727_init_device(struct lp8727_chg *pchg)
 {
 	u8 val;
 	int ret;

 	val = ID200_EN | ADC_EN | CP_EN;
 	ret = lp8727_i2c_write_byte(pchg, CTRL1, &val);
 	if (ret)
 		return ret;

 	val = INT_EN | CHGDET_EN;
 	ret = lp8727_i2c_write_byte(pchg, CTRL2, &val);
 	if (ret)
 		return ret;

 	return 0;
 }

 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 {
 	u8 val;
 	lp8727_i2c_read_byte(pchg, STATUS1, &val);
 	return (val & DCPORT);
 }

 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 {
 	u8 val;
 	lp8727_i2c_read_byte(pchg, STATUS1, &val);
 	return (val & CHPORT);
 }

 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 {
 	u8 val = sw;
 	lp8727_i2c_write_byte(pchg, SWCTRL, &val);
 }

 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 {
 	u8 devid = ID_NONE;
 	u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;

 	switch (id) {
 	case 0x5:
 		devid = ID_TA;
 		pchg->chg_parm = &pchg->pdata->ac;
 		break;
 	case 0xB:
 		if (lp8727_is_dedicated_charger(pchg)) {
 			pchg->chg_parm = &pchg->pdata->ac;
 			devid = ID_DEDICATED_CHG;
 		} else if (lp8727_is_usb_charger(pchg)) {
 			pchg->chg_parm = &pchg->pdata->usb;
 			devid = ID_USB_CHG;
 			swctrl = SW_DM1_DM | SW_DP2_DP;
 		} else if (vbusin) {
 			devid = ID_USB_DS;
 			swctrl = SW_DM1_DM | SW_DP2_DP;
 		}
 		break;
 	default:
 		devid = ID_NONE;
 		pchg->chg_parm = NULL;
 		break;
 	}

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

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

 	lp8727_i2c_read_byte(pchg, CTRL2, &val);
 	val |= CHGDET_EN;
 	lp8727_i2c_write_byte(pchg, CTRL2, &val);
 }

 static void lp8727_delayed_func(struct work_struct *_work)
 {
 	u8 intstat[2], idno, vbus;
 	struct lp8727_chg *pchg =
 	    container_of(_work, struct lp8727_chg, work.work);

 	if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
 		dev_err(pchg->dev, "can not read INT registers\n");
 		return;
 	}

 	idno = intstat[0] & IDNO;
 	vbus = intstat[0] & 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;
 	unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);

 	queue_delayed_work(pchg->irqthread, &pchg->work, delay);

 	return IRQ_HANDLED;
 }

 static int lp8727_intr_config(struct lp8727_chg *pchg)
 {
 	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);

 	pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
 	if (!pchg->irqthread) {
 		dev_err(pchg->dev, "can not create thread for lp8727\n");
 		return -ENOMEM;
 	}

 	return request_threaded_irq(pchg->client->irq,
 				NULL,
 				lp8727_isr_func,
 				IRQF_TRIGGER_FALLING,
 				"lp8727_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)
 		val->intval = lp8727_is_charger_attached(psy->name,
 							 pchg->devid);

 	return 0;
 }

 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);
 	u8 read;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 			lp8727_i2c_read_byte(pchg, STATUS1, &read);
 			if (((read & CHGSTAT) >> 4) == EOC)
 				val->intval = POWER_SUPPLY_STATUS_FULL;
 			else
 				val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		} else {
 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 		}
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		lp8727_i2c_read_byte(pchg, STATUS2, &read);
 		read = (read & TEMP_STAT) >> 5;
 		if (read >= 0x1 && read <= 0x3)
 			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 		else
 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		if (pchg->pdata->get_batt_present)
 			val->intval = pchg->pdata->get_batt_present();
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		if (pchg->pdata->get_batt_level)
 			val->intval = pchg->pdata->get_batt_level();
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY:
 		if (pchg->pdata->get_batt_capacity)
 			val->intval = pchg->pdata->get_batt_capacity();
 		break;
 	case POWER_SUPPLY_PROP_TEMP:
 		if (pchg->pdata->get_batt_temp)
 			val->intval = pchg->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 val;
 	u8 eoc_level, ichg;

 	if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 		if (pchg->chg_parm) {
 			eoc_level = pchg->chg_parm->eoc_level;
 			ichg = pchg->chg_parm->ichg;
 			val = (ichg << 4) | eoc_level;
 			lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
 		}
 	}
 }

 static int lp8727_register_psy(struct lp8727_chg *pchg)
 {
 	struct lp8727_psy *psy;

 	psy = kzalloc(sizeof(*psy), GFP_KERNEL);
 	if (!psy)
 		goto err_mem;

 	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;

 	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;

 	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;

 	return 0;

 err_mem:
 	return -ENOMEM;
 err_psy:
 	kfree(psy);
 	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);
 	kfree(psy);
 }

 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;

 	pchg = kzalloc(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);
 		goto error;
 	}

 	ret = lp8727_intr_config(pchg);
 	if (ret) {
 		dev_err(pchg->dev, "irq handler err: %d", ret);
 		goto error;
 	}

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

 	return 0;

 error:
 	kfree(pchg);
 	return ret;
 }

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

 	lp8727_unregister_psy(pchg);
 	free_irq(pchg->client->irq, pchg);
 	flush_workqueue(pchg->irqthread);
 	destroy_workqueue(pchg->irqthread);
 	kfree(pchg);
 	return 0;
 }

 static const struct i2c_device_id lp8727_ids[] = {
 	{"lp8727", 0},
 	{ }
 };

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

 static int __init lp8727_init(void)
 {
 	return i2c_add_driver(&lp8727_driver);
 }

 static void __exit lp8727_exit(void)
 {
 	i2c_del_driver(&lp8727_driver);
 }

 module_init(lp8727_init);
 module_exit(lp8727_exit);

 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 MODULE_AUTHOR
     ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
 MODULE_LICENSE("GPL");
	/*
	* Driver for LP8727 Micro/Mini USB IC with intergrated 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/lp8727.h>

	#define DEBOUNCE_MSEC 270

	/* Registers */
	#define CTRL1 0x1
	#define CTRL2 0x2
	#define SWCTRL 0x3
	#define INT1 0x4
	#define INT2 0x5
	#define STATUS1 0x6
	#define STATUS2 0x7
	#define CHGCTRL2 0x9

	/* CTRL1 register */
	#define CP_EN (1 << 0)
	#define ADC_EN (1 << 1)
	#define ID200_EN (1 << 4)

	/* CTRL2 register */
	#define CHGDET_EN (1 << 1)
	#define INT_EN (1 << 6)

	/* SWCTRL register */
	#define SW_DM1_DM (0x0 << 0)
	#define SW_DM1_U1 (0x1 << 0)
	#define SW_DM1_HiZ (0x7 << 0)
	#define SW_DP2_DP (0x0 << 3)
	#define SW_DP2_U2 (0x1 << 3)
	#define SW_DP2_HiZ (0x7 << 3)

	/* INT1 register */
	#define IDNO (0xF << 0)
	#define VBUS (1 << 4)

	/* STATUS1 register */
	#define CHGSTAT (3 << 4)
	#define CHPORT (1 << 6)
	#define DCPORT (1 << 7)

	/* STATUS2 register */
	#define TEMP_STAT (3 << 5)

	enum lp8727_dev_id {
	ID_NONE,
	ID_TA,
	ID_DEDICATED_CHG,
	ID_USB_CHG,
	ID_USB_DS,
	ID_MAX,
	};

	enum lp8727_chg_stat {
	PRECHG,
	CC,
	CV,
	EOC,
	};

	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 delayed_work work;
	struct workqueue_struct *irqthread;
	struct lp8727_platform_data *pdata;
	struct lp8727_psy *psy;
	struct lp8727_chg_param *chg_parm;
	enum lp8727_dev_id devid;
	};

	static int lp8727_i2c_read(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 int lp8727_i2c_write(struct lp8727_chg pchg, u8 reg, u8 data, u8 len)
	{
	s32 ret;

	mutex_lock(&pchg->xfer_lock);
	ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
	mutex_unlock(&pchg->xfer_lock);

	return ret;
	}

	static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
	u8 *data)
	{
	return lp8727_i2c_read(pchg, reg, data, 1);
	}

	static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
	u8 *data)
	{
	return lp8727_i2c_write(pchg, reg, data, 1);
	}

	static int lp8727_is_charger_attached(const char *name, int id)
	{
	if (name) {
	if (!strcmp(name, "ac"))
	return (id == ID_TA \|\| id == ID_DEDICATED_CHG) ? 1 : 0;
	else if (!strcmp(name, "usb"))
	return (id == ID_USB_CHG) ? 1 : 0;
	}

	return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
	}

	static int lp8727_init_device(struct lp8727_chg *pchg)
	{
	u8 val;
	int ret;

	val = ID200_EN \| ADC_EN \| CP_EN;
	ret = lp8727_i2c_write_byte(pchg, CTRL1, &val);
	if (ret)
	return ret;

	val = INT_EN \| CHGDET_EN;
	ret = lp8727_i2c_write_byte(pchg, CTRL2, &val);
	if (ret)
	return ret;

	return 0;
	}

	static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
	{
	u8 val;
	lp8727_i2c_read_byte(pchg, STATUS1, &val);
	return (val & DCPORT);
	}

	static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
	{
	u8 val;
	lp8727_i2c_read_byte(pchg, STATUS1, &val);
	return (val & CHPORT);
	}

	static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
	{
	u8 val = sw;
	lp8727_i2c_write_byte(pchg, SWCTRL, &val);
	}

	static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
	{
	u8 devid = ID_NONE;
	u8 swctrl = SW_DM1_HiZ \| SW_DP2_HiZ;

	switch (id) {
	case 0x5:
	devid = ID_TA;
	pchg->chg_parm = &pchg->pdata->ac;
	break;
	case 0xB:
	if (lp8727_is_dedicated_charger(pchg)) {
	pchg->chg_parm = &pchg->pdata->ac;
	devid = ID_DEDICATED_CHG;
	} else if (lp8727_is_usb_charger(pchg)) {
	pchg->chg_parm = &pchg->pdata->usb;
	devid = ID_USB_CHG;
	swctrl = SW_DM1_DM \| SW_DP2_DP;
	} else if (vbusin) {
	devid = ID_USB_DS;
	swctrl = SW_DM1_DM \| SW_DP2_DP;
	}
	break;
	default:
	devid = ID_NONE;
	pchg->chg_parm = NULL;
	break;
	}

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

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

	lp8727_i2c_read_byte(pchg, CTRL2, &val);
	val \|= CHGDET_EN;
	lp8727_i2c_write_byte(pchg, CTRL2, &val);
	}

	static void lp8727_delayed_func(struct work_struct *_work)
	{
	u8 intstat[2], idno, vbus;
	struct lp8727_chg *pchg =
	container_of(_work, struct lp8727_chg, work.work);

	if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
	dev_err(pchg->dev, "can not read INT registers\n");
	return;
	}

	idno = intstat[0] & IDNO;
	vbus = intstat[0] & 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;
	unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);

	queue_delayed_work(pchg->irqthread, &pchg->work, delay);

	return IRQ_HANDLED;
	}

	static int lp8727_intr_config(struct lp8727_chg *pchg)
	{
	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);

	pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
	if (!pchg->irqthread) {
	dev_err(pchg->dev, "can not create thread for lp8727\n");
	return -ENOMEM;
	}

	return request_threaded_irq(pchg->client->irq,
	NULL,
	lp8727_isr_func,
	IRQF_TRIGGER_FALLING,
	"lp8727_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)
	val->intval = lp8727_is_charger_attached(psy->name,
	pchg->devid);

	return 0;
	}

	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);
	u8 read;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
	lp8727_i2c_read_byte(pchg, STATUS1, &read);
	if (((read & CHGSTAT) >> 4) == EOC)
	val->intval = POWER_SUPPLY_STATUS_FULL;
	else
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	} else {
	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	}
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	lp8727_i2c_read_byte(pchg, STATUS2, &read);
	read = (read & TEMP_STAT) >> 5;
	if (read >= 0x1 && read <= 0x3)
	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	else
	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	break;
	case POWER_SUPPLY_PROP_PRESENT:
	if (pchg->pdata->get_batt_present)
	val->intval = pchg->pdata->get_batt_present();
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	if (pchg->pdata->get_batt_level)
	val->intval = pchg->pdata->get_batt_level();
	break;
	case POWER_SUPPLY_PROP_CAPACITY:
	if (pchg->pdata->get_batt_capacity)
	val->intval = pchg->pdata->get_batt_capacity();
	break;
	case POWER_SUPPLY_PROP_TEMP:
	if (pchg->pdata->get_batt_temp)
	val->intval = pchg->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 val;
	u8 eoc_level, ichg;

	if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
	if (pchg->chg_parm) {
	eoc_level = pchg->chg_parm->eoc_level;
	ichg = pchg->chg_parm->ichg;
	val = (ichg << 4) \| eoc_level;
	lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
	}
	}
	}

	static int lp8727_register_psy(struct lp8727_chg *pchg)
	{
	struct lp8727_psy *psy;

	psy = kzalloc(sizeof(*psy), GFP_KERNEL);
	if (!psy)
	goto err_mem;

	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;

	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;

	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;

	return 0;

	err_mem:
	return -ENOMEM;
	err_psy:
	kfree(psy);
	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);
	kfree(psy);
	}

	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;

	pchg = kzalloc(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);
	goto error;
	}

	ret = lp8727_intr_config(pchg);
	if (ret) {
	dev_err(pchg->dev, "irq handler err: %d", ret);
	goto error;
	}

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

	return 0;

	error:
	kfree(pchg);
	return ret;
	}

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

	lp8727_unregister_psy(pchg);
	free_irq(pchg->client->irq, pchg);
	flush_workqueue(pchg->irqthread);
	destroy_workqueue(pchg->irqthread);
	kfree(pchg);
	return 0;
	}

	static const struct i2c_device_id lp8727_ids[] = {
	{"lp8727", 0},
	{ }
	};

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

	static int __init lp8727_init(void)
	{
	return i2c_add_driver(&lp8727_driver);
	}

	static void __exit lp8727_exit(void)
	{
	i2c_del_driver(&lp8727_driver);
	}

	module_init(lp8727_init);
	module_exit(lp8727_exit);

	MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
	MODULE_AUTHOR
	("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
	MODULE_LICENSE("GPL");