[deliverable/linux.git] / drivers / power / lp8727_charger.c

/*
 * Driver for LP8727 Micro/Mini USB IC with intergrated charger
 *
 *			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 void lp8727_init_device(struct lp8727_chg *pchg)
{
	u8 val;

	val = ID200_EN | ADC_EN | CP_EN;
	if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
		dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);

	val = INT_EN | CHGDET_EN;
	if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
		dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
}

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

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

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

	(void)lp8727_i2c_read_byte(pchg, CTRL2, &val);
	val |= CHGDET_EN;
	(void)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 void 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");

	if (request_threaded_irq(pchg->client->irq,
				 NULL,
				 lp8727_isr_func,
				 IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
		dev_err(pchg->dev, "lp8727 irq can not be registered\n");
	}
}

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)) {
			(void)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:
		(void)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;
			(void)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) {
		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;

	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);

	lp8727_init_device(pchg);
	lp8727_intr_config(pchg);

	ret = lp8727_register_psy(pchg);
	if (ret) {
		dev_err(pchg->dev,
			"can not register power supplies. err=%d", ret);
	}

	return 0;
}

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_chg_exit(void)
{
	i2c_del_driver(&lp8727_driver);
}

module_init(lp8727_init);
module_exit(lp8727_chg_exit);

MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
MODULE_AUTHOR("Woogyom Kim <milo.kim@nsc.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
2165c8a4 WK	1	/*
	2	* Driver for LP8727 Micro/Mini USB IC with intergrated charger
	3	*
	4	* Copyright (C) 2011 National Semiconductor
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/i2c.h>
	16	#include <linux/power_supply.h>
	17	#include <linux/lp8727.h>
	18
	19	#define DEBOUNCE_MSEC 270
	20
	21	/* Registers */
	22	#define CTRL1 0x1
	23	#define CTRL2 0x2
	24	#define SWCTRL 0x3
	25	#define INT1 0x4
	26	#define INT2 0x5
	27	#define STATUS1 0x6
	28	#define STATUS2 0x7
	29	#define CHGCTRL2 0x9
	30
	31	/* CTRL1 register */
	32	#define CP_EN (1 << 0)
	33	#define ADC_EN (1 << 1)
	34	#define ID200_EN (1 << 4)
	35
	36	/* CTRL2 register */
	37	#define CHGDET_EN (1 << 1)
	38	#define INT_EN (1 << 6)
	39
	40	/* SWCTRL register */
	41	#define SW_DM1_DM (0x0 << 0)
	42	#define SW_DM1_U1 (0x1 << 0)
	43	#define SW_DM1_HiZ (0x7 << 0)
	44	#define SW_DP2_DP (0x0 << 3)
	45	#define SW_DP2_U2 (0x1 << 3)
	46	#define SW_DP2_HiZ (0x7 << 3)
	47
	48	/* INT1 register */
	49	#define IDNO (0xF << 0)
	50	#define VBUS (1 << 4)
	51
	52	/* STATUS1 register */
	53	#define CHGSTAT (3 << 4)
	54	#define CHPORT (1 << 6)
	55	#define DCPORT (1 << 7)
	56
	57	/* STATUS2 register */
	58	#define TEMP_STAT (3 << 5)
	59
	60	enum lp8727_dev_id {
	61	ID_NONE,
	62	ID_TA,
	63	ID_DEDICATED_CHG,
	64	ID_USB_CHG,
65	ID_USB_DS,
66	ID_MAX,
67	};
68
69	enum lp8727_chg_stat {
70	PRECHG,
71	CC,
72	CV,
73	EOC,
74	};
75
76	struct lp8727_psy {
77	struct power_supply ac;
78	struct power_supply usb;
79	struct power_supply batt;
80	};
81
82	struct lp8727_chg {
83	struct device *dev;
84	struct i2c_client *client;
85	struct mutex xfer_lock;
86	struct delayed_work work;
87	struct workqueue_struct *irqthread;
88	struct lp8727_platform_data *pdata;
89	struct lp8727_psy *psy;
90	struct lp8727_chg_param *chg_parm;
91	enum lp8727_dev_id devid;
92	};
93
94	static int lp8727_i2c_read(struct lp8727_chg pchg, u8 reg, u8 data, u8 len)
95	{
96	s32 ret;
97
98	mutex_lock(&pchg->xfer_lock);
99	ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
100	mutex_unlock(&pchg->xfer_lock);
101
102	return (ret != len) ? -EIO : 0;
103	}
104
105	static int lp8727_i2c_write(struct lp8727_chg pchg, u8 reg, u8 data, u8 len)
106	{
107	s32 ret;
108
109	mutex_lock(&pchg->xfer_lock);
110	ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
111	mutex_unlock(&pchg->xfer_lock);
112
113	return ret;
114	}
115
116	static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
117	u8 * data)
118	{
119	return lp8727_i2c_read(pchg, reg, data, 1);
120	}
121
122	static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
123	u8 * data)
124	{
125	return lp8727_i2c_write(pchg, reg, data, 1);
126	}
127
128	static int lp8727_is_charger_attached(const char *name, int id)
129	{
130	if (name) {
131	if (!strcmp(name, "ac"))
132	return (id == ID_TA \|\| id == ID_DEDICATED_CHG) ? 1 : 0;
133	else if (!strcmp(name, "usb"))
134	return (id == ID_USB_CHG) ? 1 : 0;
135	}
136
137	return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
138	}
139
140	static void lp8727_init_device(struct lp8727_chg *pchg)
141	{
142	u8 val;
143
144	val = ID200_EN \| ADC_EN \| CP_EN;
145	if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
146	dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
147
148	val = INT_EN \| CHGDET_EN;
149	if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
150	dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
151	}
152
153	static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
154	{
155	u8 val;
156	(void)lp8727_i2c_read_byte(pchg, STATUS1, &val);
157	return (val & DCPORT);
158	}
159
160	static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
161	{
162	u8 val;
163	(void)lp8727_i2c_read_byte(pchg, STATUS1, &val);
164	return (val & CHPORT);
165	}
166
167	static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
168	{
169	u8 val = sw;
170	(void)lp8727_i2c_write_byte(pchg, SWCTRL, &val);
171	}
172
173	static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
174	{
175	u8 devid = ID_NONE;
176	u8 swctrl = SW_DM1_HiZ \| SW_DP2_HiZ;
177
178	switch (id) {
179	case 0x5:
180	devid = ID_TA;
181	pchg->chg_parm = &pchg->pdata->ac;
182	break;
183	case 0xB:
184	if (lp8727_is_dedicated_charger(pchg)) {
185	pchg->chg_parm = &pchg->pdata->ac;
186	devid = ID_DEDICATED_CHG;
187	} else if (lp8727_is_usb_charger(pchg)) {
188	pchg->chg_parm = &pchg->pdata->usb;
189	devid = ID_USB_CHG;
190	swctrl = SW_DM1_DM \| SW_DP2_DP;
191	} else if (vbusin) {
192	devid = ID_USB_DS;
193	swctrl = SW_DM1_DM \| SW_DP2_DP;
194	}
195	break;
196	default:
197	devid = ID_NONE;
198	pchg->chg_parm = NULL;
199	break;
200	}
201
202	pchg->devid = devid;
203	lp8727_ctrl_switch(pchg, swctrl);
204	}
205
206	static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
207	{
208	u8 val;
209
210	(void)lp8727_i2c_read_byte(pchg, CTRL2, &val);
211	val \|= CHGDET_EN;
212	(void)lp8727_i2c_write_byte(pchg, CTRL2, &val);
213	}
214
215	static void lp8727_delayed_func(struct work_struct *_work)
216	{
217	u8 intstat[2], idno, vbus;
218	struct lp8727_chg *pchg =
219	container_of(_work, struct lp8727_chg, work.work);
220
221	if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
222	dev_err(pchg->dev, "can not read INT registers\n");
223	return;
224	}
225
226	idno = intstat[0] & IDNO;
227	vbus = intstat[0] & VBUS;
228
229	lp8727_id_detection(pchg, idno, vbus);
230	lp8727_enable_chgdet(pchg);
231
232	power_supply_changed(&pchg->psy->ac);
233	power_supply_changed(&pchg->psy->usb);
234	power_supply_changed(&pchg->psy->batt);
235	}
236
237	static irqreturn_t lp8727_isr_func(int irq, void *ptr)
238	{
239	struct lp8727_chg *pchg = ptr;
240	unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
241
242	queue_delayed_work(pchg->irqthread, &pchg->work, delay);
243
244	return IRQ_HANDLED;
245	}
246
247	static void lp8727_intr_config(struct lp8727_chg *pchg)
248	{
249	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
250
251	pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
252	if (!pchg->irqthread)
253	dev_err(pchg->dev, "can not create thread for lp8727\n");
254
255	if (request_threaded_irq(pchg->client->irq,
256	NULL,
257	lp8727_isr_func,
258	IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
259	dev_err(pchg->dev, "lp8727 irq can not be registered\n");
260	}
261	}
262
263	static enum power_supply_property lp8727_charger_prop[] = {
264	POWER_SUPPLY_PROP_ONLINE,
265	};
266
267	static enum power_supply_property lp8727_battery_prop[] = {
268	POWER_SUPPLY_PROP_STATUS,
269	POWER_SUPPLY_PROP_HEALTH,
270	POWER_SUPPLY_PROP_PRESENT,
271	POWER_SUPPLY_PROP_VOLTAGE_NOW,
272	POWER_SUPPLY_PROP_CAPACITY,
273	POWER_SUPPLY_PROP_TEMP,
274	};
275
276	static char *battery_supplied_to[] = {
277	"main_batt",
278	};
279
280	static int lp8727_charger_get_property(struct power_supply *psy,
281	enum power_supply_property psp,
282	union power_supply_propval *val)
283	{
284	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
285
286	if (psp == POWER_SUPPLY_PROP_ONLINE) {
287	val->intval = lp8727_is_charger_attached(psy->name,
288	pchg->devid);
289	}
290
291	return 0;
292	}
293
294	static int lp8727_battery_get_property(struct power_supply *psy,
295	enum power_supply_property psp,
296	union power_supply_propval *val)
297	{
298	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
299	u8 read;
300
301	switch (psp) {
302	case POWER_SUPPLY_PROP_STATUS:
303	if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
304	(void)lp8727_i2c_read_byte(pchg, STATUS1, &read);
305	if (((read & CHGSTAT) >> 4) == EOC)
306	val->intval = POWER_SUPPLY_STATUS_FULL;
307	else
308	val->intval = POWER_SUPPLY_STATUS_CHARGING;
309	} else {
310	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
311	}
312	break;
313	case POWER_SUPPLY_PROP_HEALTH:
314	(void)lp8727_i2c_read_byte(pchg, STATUS2, &read);
315	read = (read & TEMP_STAT) >> 5;
316	if (read >= 0x1 && read <= 0x3)
317	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
318	else
319	val->intval = POWER_SUPPLY_HEALTH_GOOD;
320	break;
321	case POWER_SUPPLY_PROP_PRESENT:
322	if (pchg->pdata->get_batt_present)
323	val->intval = pchg->pdata->get_batt_present();
324	break;
325	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
326	if (pchg->pdata->get_batt_level)
327	val->intval = pchg->pdata->get_batt_level();
328	break;
329	case POWER_SUPPLY_PROP_CAPACITY:
330	if (pchg->pdata->get_batt_capacity)
331	val->intval = pchg->pdata->get_batt_capacity();
332	break;
333	case POWER_SUPPLY_PROP_TEMP:
334	if (pchg->pdata->get_batt_temp)
335	val->intval = pchg->pdata->get_batt_temp();
336	break;
337	default:
338	break;
339	}
340
341	return 0;
342	}
343
344	static void lp8727_charger_changed(struct power_supply *psy)
345	{
346	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
347	u8 val;
348	u8 eoc_level, ichg;
349
350	if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
351	if (pchg->chg_parm) {
352	eoc_level = pchg->chg_parm->eoc_level;
353	ichg = pchg->chg_parm->ichg;
354	val = (ichg << 4) \| eoc_level;
355	(void)lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
356	}
357	}
358	}
359
360	static int lp8727_register_psy(struct lp8727_chg *pchg)
361	{
362	struct lp8727_psy *psy;
363
364	psy = kzalloc(sizeof(*psy), GFP_KERNEL);
365	if (!psy)
366	goto err_mem;
367
368	pchg->psy = psy;
369
370	psy->ac.name = "ac";
371	psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
372	psy->ac.properties = lp8727_charger_prop;
373	psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
374	psy->ac.get_property = lp8727_charger_get_property;
375	psy->ac.supplied_to = battery_supplied_to;
376	psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
377
378	if (power_supply_register(pchg->dev, &psy->ac))
379	goto err_psy;
380
381	psy->usb.name = "usb";
382	psy->usb.type = POWER_SUPPLY_TYPE_USB;
383	psy->usb.properties = lp8727_charger_prop;
384	psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
385	psy->usb.get_property = lp8727_charger_get_property;
386	psy->usb.supplied_to = battery_supplied_to;
387	psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
388
389	if (power_supply_register(pchg->dev, &psy->usb))
390	goto err_psy;
391
392	psy->batt.name = "main_batt";
393	psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
394	psy->batt.properties = lp8727_battery_prop;
395	psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
396	psy->batt.get_property = lp8727_battery_get_property;
397	psy->batt.external_power_changed = lp8727_charger_changed;
398
399	if (power_supply_register(pchg->dev, &psy->batt))
400	goto err_psy;
401
402	return 0;
403
404	err_mem:
405	return -ENOMEM;
406	err_psy:
407	kfree(psy);
408	return -EPERM;
409	}
410
411	static void lp8727_unregister_psy(struct lp8727_chg *pchg)
412	{
413	struct lp8727_psy *psy = pchg->psy;
414
415	if (psy) {
416	power_supply_unregister(&psy->ac);
417	power_supply_unregister(&psy->usb);
418	power_supply_unregister(&psy->batt);
419	kfree(psy);
420	}
421	}
422
423	static int lp8727_probe(struct i2c_client cl, const struct i2c_device_id id)
424	{
425	struct lp8727_chg *pchg;
426	int ret;
427
428	pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
429	if (!pchg)
430	return -ENOMEM;
431
432	pchg->client = cl;
433	pchg->dev = &cl->dev;
434	pchg->pdata = cl->dev.platform_data;
435	i2c_set_clientdata(cl, pchg);
436
437	mutex_init(&pchg->xfer_lock);
438
439	lp8727_init_device(pchg);
440	lp8727_intr_config(pchg);
441
442	ret = lp8727_register_psy(pchg);
443	if (ret) {
444	dev_err(pchg->dev,
445	"can not register power supplies. err=%d", ret);
446	}
447
448	return 0;
449	}
450
451	static int __devexit lp8727_remove(struct i2c_client *cl)
452	{
453	struct lp8727_chg *pchg = i2c_get_clientdata(cl);
454
455	lp8727_unregister_psy(pchg);
456	free_irq(pchg->client->irq, pchg);
457	flush_workqueue(pchg->irqthread);
458	destroy_workqueue(pchg->irqthread);
459	kfree(pchg);
460	return 0;
461	}
462
463	static const struct i2c_device_id lp8727_ids[] = {
464	{"lp8727", 0},
465	};
466
467	static struct i2c_driver lp8727_driver = {
468	.driver = {
469	.name = "lp8727",
470	},
471	.probe = lp8727_probe,
472	.remove = __devexit_p(lp8727_remove),
473	.id_table = lp8727_ids,
474	};
475
476	static int __init lp8727_init(void)
477	{
478	return i2c_add_driver(&lp8727_driver);
479	}
480
481	static void __exit lp8727_chg_exit(void)
482	{
483	i2c_del_driver(&lp8727_driver);
484	}
485
486	module_init(lp8727_init);
487	module_exit(lp8727_chg_exit);
488
489	MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
490	MODULE_AUTHOR("Woogyom Kim <milo.kim@nsc.com>");
491	MODULE_LICENSE("GPL");