Initial import

1 files changed, 847 insertions, 0 deletions

diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
new file mode 100644
index 000000000..6cc5e87ec
--- /dev/null
+++ b/drivers/power/max17042_battery.c
@@ -0,0 +1,847 @@
+/*
+ * Fuel gauge driver for Maxim 17042 / 8966 / 8997
+ *  Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
+ *
+ * Copyright (C) 2011 Samsung Electronics
+ * MyungJoo Ham <myungjoo.ham@samsung.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max17040_battery.c
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/mod_devicetable.h>
+#include <linux/power_supply.h>
+#include <linux/power/max17042_battery.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+/* Status register bits */
+#define STATUS_POR_BIT         (1 << 1)
+#define STATUS_BST_BIT         (1 << 3)
+#define STATUS_VMN_BIT         (1 << 8)
+#define STATUS_TMN_BIT         (1 << 9)
+#define STATUS_SMN_BIT         (1 << 10)
+#define STATUS_BI_BIT          (1 << 11)
+#define STATUS_VMX_BIT         (1 << 12)
+#define STATUS_TMX_BIT         (1 << 13)
+#define STATUS_SMX_BIT         (1 << 14)
+#define STATUS_BR_BIT          (1 << 15)
+
+/* Interrupt mask bits */
+#define CONFIG_ALRT_BIT_ENBL	(1 << 2)
+#define STATUS_INTR_SOCMIN_BIT	(1 << 10)
+#define STATUS_INTR_SOCMAX_BIT	(1 << 14)
+
+#define VFSOC0_LOCK		0x0000
+#define VFSOC0_UNLOCK		0x0080
+#define MODEL_UNLOCK1	0X0059
+#define MODEL_UNLOCK2	0X00C4
+#define MODEL_LOCK1		0X0000
+#define MODEL_LOCK2		0X0000
+
+#define dQ_ACC_DIV	0x4
+#define dP_ACC_100	0x1900
+#define dP_ACC_200	0x3200
+
+struct max17042_chip {
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct power_supply *battery;
+	enum max170xx_chip_type chip_type;
+	struct max17042_platform_data *pdata;
+	struct work_struct work;
+	int    init_complete;
+};
+
+static enum power_supply_property max17042_battery_props[] = {
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_CYCLE_COUNT,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+	POWER_SUPPLY_PROP_VOLTAGE_OCV,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_COUNTER,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+};
+
+static int max17042_get_property(struct power_supply *psy,
+			    enum power_supply_property psp,
+			    union power_supply_propval *val)
+{
+	struct max17042_chip *chip = power_supply_get_drvdata(psy);
+	struct regmap *map = chip->regmap;
+	int ret;
+	u32 data;
+
+	if (!chip->init_complete)
+		return -EAGAIN;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+		ret = regmap_read(map, MAX17042_STATUS, &data);
+		if (ret < 0)
+			return ret;
+
+		if (data & MAX17042_STATUS_BattAbsent)
+			val->intval = 0;
+		else
+			val->intval = 1;
+		break;
+	case POWER_SUPPLY_PROP_CYCLE_COUNT:
+		ret = regmap_read(map, MAX17042_Cycles, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+		ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data >> 8;
+		val->intval *= 20000; /* Units of LSB = 20mV */
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
+			ret = regmap_read(map, MAX17042_V_empty, &data);
+		else
+			ret = regmap_read(map, MAX17047_V_empty, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data >> 7;
+		val->intval *= 10000; /* Units of LSB = 10mV */
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = regmap_read(map, MAX17042_VCELL, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data * 625 / 8;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		ret = regmap_read(map, MAX17042_AvgVCELL, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data * 625 / 8;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+		ret = regmap_read(map, MAX17042_OCVInternal, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data * 625 / 8;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = regmap_read(map, MAX17042_RepSOC, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data >> 8;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL:
+		ret = regmap_read(map, MAX17042_FullCAP, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data * 1000 / 2;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+		ret = regmap_read(map, MAX17042_QH, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data * 1000 / 2;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		ret = regmap_read(map, MAX17042_TEMP, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = data;
+		/* The value is signed. */
+		if (val->intval & 0x8000) {
+			val->intval = (0x7fff & ~val->intval) + 1;
+			val->intval *= -1;
+		}
+		/* The value is converted into deci-centigrade scale */
+		/* Units of LSB = 1 / 256 degree Celsius */
+		val->intval = val->intval * 10 / 256;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		if (chip->pdata->enable_current_sense) {
+			ret = regmap_read(map, MAX17042_Current, &data);
+			if (ret < 0)
+				return ret;
+
+			val->intval = data;
+			if (val->intval & 0x8000) {
+				/* Negative */
+				val->intval = ~val->intval & 0x7fff;
+				val->intval++;
+				val->intval *= -1;
+			}
+			val->intval *= 1562500 / chip->pdata->r_sns;
+		} else {
+			return -EINVAL;
+		}
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		if (chip->pdata->enable_current_sense) {
+			ret = regmap_read(map, MAX17042_AvgCurrent, &data);
+			if (ret < 0)
+				return ret;
+
+			val->intval = data;
+			if (val->intval & 0x8000) {
+				/* Negative */
+				val->intval = ~val->intval & 0x7fff;
+				val->intval++;
+				val->intval *= -1;
+			}
+			val->intval *= 1562500 / chip->pdata->r_sns;
+		} else {
+			return -EINVAL;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
+{
+	int retries = 8;
+	int ret;
+	u32 read_value;
+
+	do {
+		ret = regmap_write(map, reg, value);
+		regmap_read(map, reg, &read_value);
+		if (read_value != value) {
+			ret = -EIO;
+			retries--;
+		}
+	} while (retries && read_value != value);
+
+	if (ret < 0)
+		pr_err("%s: err %d\n", __func__, ret);
+
+	return ret;
+}
+
+static inline void max17042_override_por(struct regmap *map,
+					 u8 reg, u16 value)
+{
+	if (value)
+		regmap_write(map, reg, value);
+}
+
+static inline void max10742_unlock_model(struct max17042_chip *chip)
+{
+	struct regmap *map = chip->regmap;
+
+	regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
+	regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
+}
+
+static inline void max10742_lock_model(struct max17042_chip *chip)
+{
+	struct regmap *map = chip->regmap;
+
+	regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
+	regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
+}
+
+static inline void max17042_write_model_data(struct max17042_chip *chip,
+					u8 addr, int size)
+{
+	struct regmap *map = chip->regmap;
+	int i;
+
+	for (i = 0; i < size; i++)
+		regmap_write(map, addr + i,
+			chip->pdata->config_data->cell_char_tbl[i]);
+}
+
+static inline void max17042_read_model_data(struct max17042_chip *chip,
+					u8 addr, u32 *data, int size)
+{
+	struct regmap *map = chip->regmap;
+	int i;
+
+	for (i = 0; i < size; i++)
+		regmap_read(map, addr + i, &data[i]);
+}
+
+static inline int max17042_model_data_compare(struct max17042_chip *chip,
+					u16 *data1, u16 *data2, int size)
+{
+	int i;
+
+	if (memcmp(data1, data2, size)) {
+		dev_err(&chip->client->dev, "%s compare failed\n", __func__);
+		for (i = 0; i < size; i++)
+			dev_info(&chip->client->dev, "0x%x, 0x%x",
+				data1[i], data2[i]);
+		dev_info(&chip->client->dev, "\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int max17042_init_model(struct max17042_chip *chip)
+{
+	int ret;
+	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
+	u32 *temp_data;
+
+	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
+	if (!temp_data)
+		return -ENOMEM;
+
+	max10742_unlock_model(chip);
+	max17042_write_model_data(chip, MAX17042_MODELChrTbl,
+				table_size);
+	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
+				table_size);
+
+	ret = max17042_model_data_compare(
+		chip,
+		chip->pdata->config_data->cell_char_tbl,
+		(u16 *)temp_data,
+		table_size);
+
+	max10742_lock_model(chip);
+	kfree(temp_data);
+
+	return ret;
+}
+
+static int max17042_verify_model_lock(struct max17042_chip *chip)
+{
+	int i;
+	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
+	u32 *temp_data;
+	int ret = 0;
+
+	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
+	if (!temp_data)
+		return -ENOMEM;
+
+	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
+				table_size);
+	for (i = 0; i < table_size; i++)
+		if (temp_data[i])
+			ret = -EINVAL;
+
+	kfree(temp_data);
+	return ret;
+}
+
+static void max17042_write_config_regs(struct max17042_chip *chip)
+{
+	struct max17042_config_data *config = chip->pdata->config_data;
+	struct regmap *map = chip->regmap;
+
+	regmap_write(map, MAX17042_CONFIG, config->config);
+	regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
+	regmap_write(map, MAX17042_FilterCFG,
+			config->filter_cfg);
+	regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
+	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
+			chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
+		regmap_write(map, MAX17047_FullSOCThr,
+						config->full_soc_thresh);
+}
+
+static void  max17042_write_custom_regs(struct max17042_chip *chip)
+{
+	struct max17042_config_data *config = chip->pdata->config_data;
+	struct regmap *map = chip->regmap;
+
+	max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
+	max17042_write_verify_reg(map, MAX17042_TempCo,	config->tcompc0);
+	max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
+	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
+		regmap_write(map, MAX17042_EmptyTempCo,	config->empty_tempco);
+		max17042_write_verify_reg(map, MAX17042_K_empty0,
+					config->kempty0);
+	} else {
+		max17042_write_verify_reg(map, MAX17047_QRTbl00,
+						config->qrtbl00);
+		max17042_write_verify_reg(map, MAX17047_QRTbl10,
+						config->qrtbl10);
+		max17042_write_verify_reg(map, MAX17047_QRTbl20,
+						config->qrtbl20);
+		max17042_write_verify_reg(map, MAX17047_QRTbl30,
+						config->qrtbl30);
+	}
+}
+
+static void max17042_update_capacity_regs(struct max17042_chip *chip)
+{
+	struct max17042_config_data *config = chip->pdata->config_data;
+	struct regmap *map = chip->regmap;
+
+	max17042_write_verify_reg(map, MAX17042_FullCAP,
+				config->fullcap);
+	regmap_write(map, MAX17042_DesignCap, config->design_cap);
+	max17042_write_verify_reg(map, MAX17042_FullCAPNom,
+				config->fullcapnom);
+}
+
+static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
+{
+	unsigned int vfSoc;
+	struct regmap *map = chip->regmap;
+
+	regmap_read(map, MAX17042_VFSOC, &vfSoc);
+	regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
+	max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
+	regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
+}
+
+static void max17042_load_new_capacity_params(struct max17042_chip *chip)
+{
+	u32 full_cap0, rep_cap, dq_acc, vfSoc;
+	u32 rem_cap;
+
+	struct max17042_config_data *config = chip->pdata->config_data;
+	struct regmap *map = chip->regmap;
+
+	regmap_read(map, MAX17042_FullCAP0, &full_cap0);
+	regmap_read(map, MAX17042_VFSOC, &vfSoc);
+
+	/* fg_vfSoc needs to shifted by 8 bits to get the
+	 * perc in 1% accuracy, to get the right rem_cap multiply
+	 * full_cap0, fg_vfSoc and devide by 100
+	 */
+	rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
+	max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
+
+	rep_cap = rem_cap;
+	max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
+
+	/* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
+	dq_acc = config->fullcap / dQ_ACC_DIV;
+	max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
+	max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
+
+	max17042_write_verify_reg(map, MAX17042_FullCAP,
+			config->fullcap);
+	regmap_write(map, MAX17042_DesignCap,
+			config->design_cap);
+	max17042_write_verify_reg(map, MAX17042_FullCAPNom,
+			config->fullcapnom);
+	/* Update SOC register with new SOC */
+	regmap_write(map, MAX17042_RepSOC, vfSoc);
+}
+
+/*
+ * Block write all the override values coming from platform data.
+ * This function MUST be called before the POR initialization proceedure
+ * specified by maxim.
+ */
+static inline void max17042_override_por_values(struct max17042_chip *chip)
+{
+	struct regmap *map = chip->regmap;
+	struct max17042_config_data *config = chip->pdata->config_data;
+
+	max17042_override_por(map, MAX17042_TGAIN, config->tgain);
+	max17042_override_por(map, MAx17042_TOFF, config->toff);
+	max17042_override_por(map, MAX17042_CGAIN, config->cgain);
+	max17042_override_por(map, MAX17042_COFF, config->coff);
+
+	max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
+	max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
+	max17042_override_por(map, MAX17042_SALRT_Th,
+						config->soc_alrt_thresh);
+	max17042_override_por(map, MAX17042_CONFIG, config->config);
+	max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
+
+	max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
+	max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
+
+	max17042_override_por(map, MAX17042_AtRate, config->at_rate);
+	max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
+	max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
+	max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
+	max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
+	max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
+
+	max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
+	max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
+	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
+		max17042_override_por(map, MAX17042_SOC_empty,
+						config->socempty);
+	max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
+	max17042_override_por(map, MAX17042_dQacc, config->dqacc);
+	max17042_override_por(map, MAX17042_dPacc, config->dpacc);
+
+	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
+		max17042_override_por(map, MAX17042_V_empty, config->vempty);
+	else
+		max17042_override_por(map, MAX17047_V_empty, config->vempty);
+	max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
+	max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
+	max17042_override_por(map, MAX17042_FCTC, config->fctc);
+	max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
+	max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
+	if (chip->chip_type) {
+		max17042_override_por(map, MAX17042_EmptyTempCo,
+						config->empty_tempco);
+		max17042_override_por(map, MAX17042_K_empty0,
+						config->kempty0);
+	}
+}
+
+static int max17042_init_chip(struct max17042_chip *chip)
+{
+	struct regmap *map = chip->regmap;
+	int ret;
+
+	max17042_override_por_values(chip);
+	/* After Power up, the MAX17042 requires 500mS in order
+	 * to perform signal debouncing and initial SOC reporting
+	 */
+	msleep(500);
+
+	/* Initialize configaration */
+	max17042_write_config_regs(chip);
+
+	/* write cell characterization data */
+	ret = max17042_init_model(chip);
+	if (ret) {
+		dev_err(&chip->client->dev, "%s init failed\n",
+			__func__);
+		return -EIO;
+	}
+
+	ret = max17042_verify_model_lock(chip);
+	if (ret) {
+		dev_err(&chip->client->dev, "%s lock verify failed\n",
+			__func__);
+		return -EIO;
+	}
+	/* write custom parameters */
+	max17042_write_custom_regs(chip);
+
+	/* update capacity params */
+	max17042_update_capacity_regs(chip);
+
+	/* delay must be atleast 350mS to allow VFSOC
+	 * to be calculated from the new configuration
+	 */
+	msleep(350);
+
+	/* reset vfsoc0 reg */
+	max17042_reset_vfsoc0_reg(chip);
+
+	/* load new capacity params */
+	max17042_load_new_capacity_params(chip);
+
+	/* Init complete, Clear the POR bit */
+	regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
+	return 0;
+}
+
+static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
+{
+	struct regmap *map = chip->regmap;
+	u32 soc, soc_tr;
+
+	/* program interrupt thesholds such that we should
+	 * get interrupt for every 'off' perc change in the soc
+	 */
+	regmap_read(map, MAX17042_RepSOC, &soc);
+	soc >>= 8;
+	soc_tr = (soc + off) << 8;
+	soc_tr |= (soc - off);
+	regmap_write(map, MAX17042_SALRT_Th, soc_tr);
+}
+
+static irqreturn_t max17042_thread_handler(int id, void *dev)
+{
+	struct max17042_chip *chip = dev;
+	u32 val;
+
+	regmap_read(chip->regmap, MAX17042_STATUS, &val);
+	if ((val & STATUS_INTR_SOCMIN_BIT) ||
+		(val & STATUS_INTR_SOCMAX_BIT)) {
+		dev_info(&chip->client->dev, "SOC threshold INTR\n");
+		max17042_set_soc_threshold(chip, 1);
+	}
+
+	power_supply_changed(chip->battery);
+	return IRQ_HANDLED;
+}
+
+static void max17042_init_worker(struct work_struct *work)
+{
+	struct max17042_chip *chip = container_of(work,
+				struct max17042_chip, work);
+	int ret;
+
+	/* Initialize registers according to values from the platform data */
+	if (chip->pdata->enable_por_init && chip->pdata->config_data) {
+		ret = max17042_init_chip(chip);
+		if (ret)
+			return;
+	}
+
+	chip->init_complete = 1;
+}
+
+#ifdef CONFIG_OF
+static struct max17042_platform_data *
+max17042_get_pdata(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	u32 prop;
+	struct max17042_platform_data *pdata;
+
+	if (!np)
+		return dev->platform_data;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	/*
+	 * Require current sense resistor value to be specified for
+	 * current-sense functionality to be enabled at all.
+	 */
+	if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
+		pdata->r_sns = prop;
+		pdata->enable_current_sense = true;
+	}
+
+	return pdata;
+}
+#else
+static struct max17042_platform_data *
+max17042_get_pdata(struct device *dev)
+{
+	return dev->platform_data;
+}
+#endif
+
+static const struct regmap_config max17042_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.val_format_endian = REGMAP_ENDIAN_NATIVE,
+};
+
+static const struct power_supply_desc max17042_psy_desc = {
+	.name		= "max170xx_battery",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.get_property	= max17042_get_property,
+	.properties	= max17042_battery_props,
+	.num_properties	= ARRAY_SIZE(max17042_battery_props),
+};
+
+static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
+	.name		= "max170xx_battery",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.get_property	= max17042_get_property,
+	.properties	= max17042_battery_props,
+	.num_properties	= ARRAY_SIZE(max17042_battery_props) - 2,
+};
+
+static int max17042_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
+	struct power_supply_config psy_cfg = {};
+	struct max17042_chip *chip;
+	int ret;
+	int i;
+	u32 val;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
+		return -EIO;
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->client = client;
+	chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
+	if (IS_ERR(chip->regmap)) {
+		dev_err(&client->dev, "Failed to initialize regmap\n");
+		return -EINVAL;
+	}
+
+	chip->pdata = max17042_get_pdata(&client->dev);
+	if (!chip->pdata) {
+		dev_err(&client->dev, "no platform data provided\n");
+		return -EINVAL;
+	}
+
+	i2c_set_clientdata(client, chip);
+	chip->chip_type = id->driver_data;
+	psy_cfg.drv_data = chip;
+
+	/* When current is not measured,
+	 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
+	if (!chip->pdata->enable_current_sense)
+		max17042_desc = &max17042_no_current_sense_psy_desc;
+
+	if (chip->pdata->r_sns == 0)
+		chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
+
+	if (chip->pdata->init_data)
+		for (i = 0; i < chip->pdata->num_init_data; i++)
+			regmap_write(chip->regmap,
+					chip->pdata->init_data[i].addr,
+					chip->pdata->init_data[i].data);
+
+	if (!chip->pdata->enable_current_sense) {
+		regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
+		regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
+		regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
+	}
+
+	chip->battery = power_supply_register(&client->dev, max17042_desc,
+						&psy_cfg);
+	if (IS_ERR(chip->battery)) {
+		dev_err(&client->dev, "failed: power supply register\n");
+		return PTR_ERR(chip->battery);
+	}
+
+	if (client->irq) {
+		ret = request_threaded_irq(client->irq, NULL,
+					max17042_thread_handler,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					chip->battery->desc->name, chip);
+		if (!ret) {
+			regmap_update_bits(chip->regmap, MAX17042_CONFIG,
+					CONFIG_ALRT_BIT_ENBL,
+					CONFIG_ALRT_BIT_ENBL);
+			max17042_set_soc_threshold(chip, 1);
+		} else {
+			client->irq = 0;
+			dev_err(&client->dev, "%s(): cannot get IRQ\n",
+				__func__);
+		}
+	}
+
+	regmap_read(chip->regmap, MAX17042_STATUS, &val);
+	if (val & STATUS_POR_BIT) {
+		INIT_WORK(&chip->work, max17042_init_worker);
+		schedule_work(&chip->work);
+	} else {
+		chip->init_complete = 1;
+	}
+
+	return 0;
+}
+
+static int max17042_remove(struct i2c_client *client)
+{
+	struct max17042_chip *chip = i2c_get_clientdata(client);
+
+	if (client->irq)
+		free_irq(client->irq, chip);
+	power_supply_unregister(chip->battery);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int max17042_suspend(struct device *dev)
+{
+	struct max17042_chip *chip = dev_get_drvdata(dev);
+
+	/*
+	 * disable the irq and enable irq_wake
+	 * capability to the interrupt line.
+	 */
+	if (chip->client->irq) {
+		disable_irq(chip->client->irq);
+		enable_irq_wake(chip->client->irq);
+	}
+
+	return 0;
+}
+
+static int max17042_resume(struct device *dev)
+{
+	struct max17042_chip *chip = dev_get_drvdata(dev);
+
+	if (chip->client->irq) {
+		disable_irq_wake(chip->client->irq);
+		enable_irq(chip->client->irq);
+		/* re-program the SOC thresholds to 1% change */
+		max17042_set_soc_threshold(chip, 1);
+	}
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
+			max17042_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id max17042_dt_match[] = {
+	{ .compatible = "maxim,max17042" },
+	{ .compatible = "maxim,max17047" },
+	{ .compatible = "maxim,max17050" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, max17042_dt_match);
+#endif
+
+static const struct i2c_device_id max17042_id[] = {
+	{ "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
+	{ "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
+	{ "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max17042_id);
+
+static struct i2c_driver max17042_i2c_driver = {
+	.driver	= {
+		.name	= "max17042",
+		.of_match_table = of_match_ptr(max17042_dt_match),
+		.pm	= &max17042_pm_ops,
+	},
+	.probe		= max17042_probe,
+	.remove		= max17042_remove,
+	.id_table	= max17042_id,
+};
+module_i2c_driver(max17042_i2c_driver);
+
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
+MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
+MODULE_LICENSE("GPL");