power_supply: Add DA9052 battery driver

Driver for DA9052 battery charger. This driver depends on DA9052 MFD core
dirver for definitions and methods.

This patch is functionally tested on Samsung SMDKV6410.
Signed-off-by: NDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: NAshish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>

drivers/power/Kconfig

@@ -150,6 +150,13 @@ config BATTERY_DA9030
 	  Say Y here to enable support for batteries charger integrated into
 	  DA9030 PMIC.
 
+config BATTERY_DA9052
+	tristate "Dialog DA9052 Battery"
+	depends on PMIC_DA9052
+	help
+	  Say Y here to enable support for batteries charger integrated into
+	  DA9052 PMIC.
+
 config BATTERY_MAX17040
 	tristate "Maxim MAX17040 Fuel Gauge"
 	depends on I2C

drivers/power/Makefile

@@ -25,6 +25,7 @@ obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o
 obj-$(CONFIG_BATTERY_SBS)	+= sbs-battery.o
 obj-$(CONFIG_BATTERY_BQ27x00)	+= bq27x00_battery.o
 obj-$(CONFIG_BATTERY_DA9030)	+= da9030_battery.o
+obj-$(CONFIG_BATTERY_DA9052)	+= da9052-battery.o
 obj-$(CONFIG_BATTERY_MAX17040)	+= max17040_battery.o
 obj-$(CONFIG_BATTERY_MAX17042)	+= max17042_battery.o
 obj-$(CONFIG_BATTERY_Z2)	+= z2_battery.o

drivers/power/da9052-battery.c

+/*
+ * Batttery Driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/fs.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/pdata.h>
+#include <linux/mfd/da9052/reg.h>
+
+/* STATIC CONFIGURATION */
+#define DA9052_BAT_CUTOFF_VOLT		2800
+#define DA9052_BAT_TSH			62000
+#define DA9052_BAT_LOW_CAP		4
+#define DA9052_AVG_SZ			4
+#define DA9052_VC_TBL_SZ		68
+#define DA9052_VC_TBL_REF_SZ		3
+
+#define DA9052_ISET_USB_MASK		0x0F
+#define DA9052_CHG_USB_ILIM_MASK	0x40
+#define DA9052_CHG_LIM_COLS		16
+
+#define DA9052_MEAN(x, y)		((x + y) / 2)
+
+enum charger_type_enum {
+	DA9052_NOCHARGER = 1,
+	DA9052_CHARGER,
+};
+
+static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = {
+	{70,  80,  90,  100, 110, 120, 400,  450,
+	 500, 550, 600, 650, 700, 900, 1100, 1300},
+	{80,  90,  100, 110,  120,  400,  450,  500,
+	 550, 600, 800, 1000, 1200, 1400, 1600, 1800},
+};
+
+static const u16 vc_tbl_ref[3] = {10, 25, 40};
+/* Lookup table for voltage vs capacity */
+static u32 const vc_tbl[3][68][2] = {
+	/* For temperature 10 degree Celsius */
+	{
+	{4082, 100}, {4036, 98},
+	{4020, 96}, {4008, 95},
+	{3997, 93}, {3983, 91},
+	{3964, 90}, {3943, 88},
+	{3926, 87}, {3912, 85},
+	{3900, 84}, {3890, 82},
+	{3881, 80}, {3873, 79},
+	{3865, 77}, {3857, 76},
+	{3848, 74}, {3839, 73},
+	{3829, 71}, {3820, 70},
+	{3811, 68}, {3802, 67},
+	{3794, 65}, {3785, 64},
+	{3778, 62}, {3770, 61},
+	{3763, 59}, {3756, 58},
+	{3750, 56}, {3744, 55},
+	{3738, 53}, {3732, 52},
+	{3727, 50}, {3722, 49},
+	{3717, 47}, {3712, 46},
+	{3708, 44}, {3703, 43},
+	{3700, 41}, {3696, 40},
+	{3693, 38}, {3691, 37},
+	{3688, 35}, {3686, 34},
+	{3683, 32}, {3681, 31},
+	{3678, 29}, {3675, 28},
+	{3672, 26}, {3669, 25},
+	{3665, 23}, {3661, 22},
+	{3656, 21}, {3651, 19},
+	{3645, 18}, {3639, 16},
+	{3631, 15}, {3622, 13},
+	{3611, 12}, {3600, 10},
+	{3587, 9}, {3572, 7},
+	{3548, 6}, {3503, 5},
+	{3420, 3}, {3268, 2},
+	{2992, 1}, {2746, 0}
+	},
+	/* For temperature 25 degree Celsius */
+	{
+	{4102, 100}, {4065, 98},
+	{4048, 96}, {4034, 95},
+	{4021, 93}, {4011, 92},
+	{4001, 90}, {3986, 88},
+	{3968, 87}, {3952, 85},
+	{3938, 84}, {3926, 82},
+	{3916, 81}, {3908, 79},
+	{3900, 77}, {3892, 76},
+	{3883, 74}, {3874, 73},
+	{3864, 71}, {3855, 70},
+	{3846, 68}, {3836, 67},
+	{3827, 65}, {3819, 64},
+	{3810, 62}, {3801, 61},
+	{3793, 59}, {3786, 58},
+	{3778, 56}, {3772, 55},
+	{3765, 53}, {3759, 52},
+	{3754, 50}, {3748, 49},
+	{3743, 47}, {3738, 46},
+	{3733, 44}, {3728, 43},
+	{3724, 41}, {3720, 40},
+	{3716, 38}, {3712, 37},
+	{3709, 35}, {3706, 34},
+	{3703, 33}, {3701, 31},
+	{3698, 30}, {3696, 28},
+	{3693, 27}, {3690, 25},
+	{3687, 24}, {3683, 22},
+	{3680, 21}, {3675, 19},
+	{3671, 18}, {3666, 17},
+	{3660, 15}, {3654, 14},
+	{3647, 12}, {3639, 11},
+	{3630, 9}, {3621, 8},
+	{3613, 6}, {3606, 5},
+	{3597, 4}, {3582, 2},
+	{3546, 1}, {2747, 0}
+	},
+	/* For temperature 40 degree Celsius */
+	{
+	{4114, 100}, {4081, 98},
+	{4065, 96}, {4050, 95},
+	{4036, 93}, {4024, 92},
+	{4013, 90}, {4002, 88},
+	{3990, 87}, {3976, 85},
+	{3962, 84}, {3950, 82},
+	{3939, 81}, {3930, 79},
+	{3921, 77}, {3912, 76},
+	{3902, 74}, {3893, 73},
+	{3883, 71}, {3874, 70},
+	{3865, 68}, {3856, 67},
+	{3847, 65}, {3838, 64},
+	{3829, 62}, {3820, 61},
+	{3812, 59}, {3803, 58},
+	{3795, 56}, {3787, 55},
+	{3780, 53}, {3773, 52},
+	{3767, 50}, {3761, 49},
+	{3756, 47}, {3751, 46},
+	{3746, 44}, {3741, 43},
+	{3736, 41}, {3732, 40},
+	{3728, 38}, {3724, 37},
+	{3720, 35}, {3716, 34},
+	{3713, 33}, {3710, 31},
+	{3707, 30}, {3704, 28},
+	{3701, 27}, {3698, 25},
+	{3695, 24}, {3691, 22},
+	{3686, 21}, {3681, 19},
+	{3676, 18}, {3671, 17},
+	{3666, 15}, {3661, 14},
+	{3655, 12}, {3648, 11},
+	{3640, 9}, {3632, 8},
+	{3622, 6}, {3616, 5},
+	{3611, 4}, {3604, 2},
+	{3594, 1}, {2747, 0}
+	}
+};
+
+struct da9052_battery {
+	struct da9052 *da9052;
+	struct power_supply psy;
+	struct notifier_block nb;
+	int charger_type;
+	int status;
+	int health;
+};
+
+static inline int volt_reg_to_mV(int value)
+{
+	return ((value * 1000) / 512) + 2500;
+}
+
+static inline int ichg_reg_to_mA(int value)
+{
+	return (value * 3900) / 1000;
+}
+
+static int da9052_read_chgend_current(struct da9052_battery *bat,
+				       int *current_mA)
+{
+	int ret;
+
+	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
+		return -EINVAL;
+
+	ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG);
+	if (ret < 0)
+		return ret;
+
+	*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND);
+
+	return 0;
+}
+
+static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA)
+{
+	int ret;
+
+	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
+		return -EINVAL;
+
+	ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG);
+	if (ret < 0)
+		return ret;
+
+	*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV);
+
+	return 0;
+}
+
+static int da9052_bat_check_status(struct da9052_battery *bat, int *status)
+{
+	u8 v[2] = {0, 0};
+	u8 bat_status;
+	u8 chg_end;
+	int ret;
+	int chg_current;
+	int chg_end_current;
+	bool dcinsel;
+	bool dcindet;
+	bool vbussel;
+	bool vbusdet;
+	bool dc;
+	bool vbus;
+
+	ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v);
+	if (ret < 0)
+		return ret;
+
+	bat_status = v[0];
+	chg_end = v[1];
+
+	dcinsel = bat_status & DA9052_STATUSA_DCINSEL;
+	dcindet = bat_status & DA9052_STATUSA_DCINDET;
+	vbussel = bat_status & DA9052_STATUSA_VBUSSEL;
+	vbusdet = bat_status & DA9052_STATUSA_VBUSDET;
+	dc = dcinsel && dcindet;
+	vbus = vbussel && vbusdet;
+
+	/* Preference to WALL(DCIN) charger unit */
+	if (dc || vbus) {
+		bat->charger_type = DA9052_CHARGER;
+
+		/* If charging end flag is set and Charging current is greater
+		 * than charging end limit then battery is charging
+		*/
+		if ((chg_end & DA9052_STATUSB_CHGEND) != 0) {
+			ret = da9052_read_chg_current(bat, &chg_current);
+			if (ret < 0)
+				return ret;
+			ret = da9052_read_chgend_current(bat, &chg_end_current);
+			if (ret < 0)
+				return ret;
+
+			if (chg_current >= chg_end_current)
+				bat->status = POWER_SUPPLY_STATUS_CHARGING;
+			else
+				bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		} else {
+			/* If Charging end flag is cleared then battery is
+			 * charging
+			*/
+			bat->status = POWER_SUPPLY_STATUS_CHARGING;
+		}
+	} else if (dcindet || vbusdet) {
+			bat->charger_type = DA9052_CHARGER;
+			bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+	} else {
+		bat->charger_type = DA9052_NOCHARGER;
+		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
+	}
+
+	if (status != NULL)
+		*status = bat->status;
+	return 0;
+}
+
+static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV)
+{
+	int volt;
+
+	volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT);
+	if (volt < 0)
+		return volt;
+
+	*volt_mV = volt_reg_to_mV(volt);
+
+	return 0;
+}
+
+static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal)
+{
+	int bat_temp;
+
+	bat_temp = da9052_adc_read_temp(bat->da9052);
+	if (bat_temp < 0)
+		return bat_temp;
+
+	if (bat_temp > DA9052_BAT_TSH)
+		*illegal = 1;
+	else
+		*illegal = 0;
+
+	return 0;
+}
+
+static int da9052_bat_interpolate(int vbat_lower, int  vbat_upper,
+				   int level_lower, int level_upper,
+				   int bat_voltage)
+{
+	int tmp;
+
+	tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
+	tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000);
+
+	return tmp;
+}
+
+unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp)
+{
+	int i;
+
+	if (adc_temp <= vc_tbl_ref[0])
+		return 0;
+
+	if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1])
+		return DA9052_VC_TBL_REF_SZ - 1;
+
+	for (i = 0; i < DA9052_VC_TBL_REF_SZ; i++) {
+		if ((adc_temp > vc_tbl_ref[i]) &&
+		    (adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])))
+				return i;
+		if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))
+		     && (adc_temp <= vc_tbl_ref[i]))
+				return i + 1;
+	}
+}
+
+static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity)
+{
+	int adc_temp;
+	int bat_voltage;
+	int vbat_lower;
+	int vbat_upper;
+	int level_upper;
+	int level_lower;
+	int ret;
+	int flag;
+	int i = 0;
+	int j;
+
+	ret = da9052_bat_read_volt(bat, &bat_voltage);
+	if (ret < 0)
+		return ret;
+
+	adc_temp = da9052_adc_read_temp(bat->da9052);
+	if (adc_temp < 0)
+		return adc_temp;
+
+	i = da9052_determine_vc_tbl_index(adc_temp);
+
+	if (bat_voltage >= vc_tbl[i][0][0]) {
+		*capacity = 100;
+		return 0;
+	}
+	if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
+		*capacity = 0;
+		return 0;
+	}
+	flag = 0;
+
+	for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
+		if ((bat_voltage <= vc_tbl[i][j][0]) &&
+		    (bat_voltage >= vc_tbl[i][j + 1][0])) {
+			vbat_upper = vc_tbl[i][j][0];
+			vbat_lower = vc_tbl[i][j + 1][0];
+			level_upper = vc_tbl[i][j][1];
+			level_lower = vc_tbl[i][j + 1][1];
+			flag = 1;
+			break;
+		}
+	}
+	if (!flag)
+		return -EIO;
+
+	*capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
+					   level_upper, bat_voltage);
+
+	return 0;
+}
+
+static int da9052_bat_check_health(struct da9052_battery *bat, int *health)
+{
+	int ret;
+	int bat_illegal;
+	int capacity;
+
+	ret = da9052_bat_check_presence(bat, &bat_illegal);
+	if (ret < 0)
+		return ret;
+
+	if (bat_illegal) {
+		bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+		return 0;
+	}
+
+	if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
+		ret = da9052_bat_read_capacity(bat, &capacity);
+		if (ret < 0)
+			return ret;
+		if (capacity < DA9052_BAT_LOW_CAP)
+			bat->health = POWER_SUPPLY_HEALTH_DEAD;
+		else
+			bat->health = POWER_SUPPLY_HEALTH_GOOD;
+	}
+
+	*health = bat->health;
+
+	return 0;
+}
+
+static irqreturn_t da9052_bat_irq(int irq, void *data)
+{
+	struct da9052_battery *bat = data;
+
+	irq -= bat->da9052->irq_base;
+
+	if (irq == DA9052_IRQ_CHGEND)
+		bat->status = POWER_SUPPLY_STATUS_FULL;
+	else
+		da9052_bat_check_status(bat, NULL);
+
+	if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
+	    irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
+		power_supply_changed(&bat->psy);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int da9052_USB_current_notifier(struct notifier_block *nb,
+					unsigned long events, void *data)
+{
+	u8 row;
+	u8 col;
+	int *current_mA = data;
+	int ret;
+	struct da9052_battery *bat = container_of(nb, struct da9052_battery,
+						  nb);
+
+	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
+		return -EPERM;
+
+	ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
+	if (ret & DA9052_CHG_USB_ILIM_MASK)
+		return -EPERM;
+
+	if (bat->da9052->chip_id == DA9052)
+		row = 0;
+	else
+		row = 1;
+
+	if (*current_mA < da9052_chg_current_lim[row][0] ||
+	    *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
+		return -EINVAL;
+
+	for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
+		if (*current_mA <= da9052_chg_current_lim[row][col])
+			break;
+	}
+
+	return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
+				 DA9052_ISET_USB_MASK, col);
+}
+
+static int da9052_bat_get_property(struct power_supply *psy,
+				    enum power_supply_property psp,
+				    union power_supply_propval *val)
+{
+	int ret;
+	int illegal;
+	struct da9052_battery *bat = container_of(psy, struct da9052_battery,
+						  psy);
+
+	ret = da9052_bat_check_presence(bat, &illegal);
+	if (ret < 0)
+		return ret;
+
+	if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
+		return -ENODEV;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = da9052_bat_check_status(bat, &val->intval);
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval =
+			(bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		ret = da9052_bat_check_presence(bat, &val->intval);
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		ret = da9052_bat_check_health(bat, &val->intval);
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		ret = da9052_bat_read_volt(bat, &val->intval);
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		ret = da9052_read_chg_current(bat, &val->intval);
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = da9052_bat_read_capacity(bat, &val->intval);
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		val->intval = da9052_adc_read_temp(bat->da9052);
+		ret = val->intval;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return ret;
+}
+
+static enum power_supply_property da9052_bat_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+};
+
+static struct power_supply template_battery = {
+	.name		= "da9052-bat",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.properties	= da9052_bat_props,
+	.num_properties	= ARRAY_SIZE(da9052_bat_props),
+	.get_property	= da9052_bat_get_property,
+};
+
+static const char *const da9052_bat_irqs[] = {
+	"BATT TEMP",
+	"DCIN DET",
+	"DCIN REM",
+	"VBUS DET",
+	"VBUS REM",
+	"CHG END",
+};
+
+static s32 __devinit da9052_bat_probe(struct platform_device *pdev)
+{
+	struct da9052_pdata *pdata;
+	struct da9052_battery *bat;
+	int ret;
+	int irq;
+	int i;
+
+	bat = kzalloc(sizeof(struct da9052_battery), GFP_KERNEL);
+	if (!bat)
+		return -ENOMEM;
+
+	bat->da9052 = dev_get_drvdata(pdev->dev.parent);
+	bat->psy = template_battery;
+	bat->charger_type = DA9052_NOCHARGER;
+	bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
+	bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+	bat->nb.notifier_call = da9052_USB_current_notifier;
+
+	pdata = bat->da9052->dev->platform_data;
+	if (pdata != NULL && pdata->use_for_apm)
+		bat->psy.use_for_apm = pdata->use_for_apm;
+	else
+		bat->psy.use_for_apm = 1;
+
+	for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
+		irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
+		ret = request_threaded_irq(bat->da9052->irq_base + irq,
+					   NULL, da9052_bat_irq,
+					   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+					   da9052_bat_irqs[i], bat);
+		if (ret != 0) {
+			dev_err(bat->da9052->dev,
+				"DA9052 failed to request %s IRQ %d: %d\n",
+				da9052_bat_irqs[i], irq, ret);
+			goto err;
+		}
+	}
+
+	ret = power_supply_register(&pdev->dev, &bat->psy);
+	 if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	for (; i >= 0; i--) {
+		irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
+		free_irq(bat->da9052->irq_base + irq, bat);
+	}
+	kfree(bat);
+	return ret;
+}
+static int __devexit da9052_bat_remove(struct platform_device *pdev)
+{
+	int i;
+	int irq;
+	struct da9052_battery *bat = platform_get_drvdata(pdev);
+
+	for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
+		irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
+		free_irq(bat->da9052->irq_base + irq, bat);
+	}
+	power_supply_unregister(&bat->psy);
+
+	return 0;
+}
+
+static struct platform_driver da9052_bat_driver = {
+	.probe = da9052_bat_probe,
+	.remove = __devexit_p(da9052_bat_remove),
+	.driver = {
+		.name = "da9052-bat",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init da9052_bat_init(void)
+{
+	return platform_driver_register(&da9052_bat_driver);
+}
+module_init(da9052_bat_init);
+
+static void __exit da9052_bat_exit(void)
+{
+	platform_driver_unregister(&da9052_bat_driver);
+}
+module_exit(da9052_bat_exit);
+
+MODULE_DESCRIPTION("DA9052 BAT Device Driver");
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-bat");