Initial import

1 files changed, 1269 insertions, 0 deletions

diff --git a/drivers/power/pm2301_charger.c b/drivers/power/pm2301_charger.c
new file mode 100644
index 000000000..cc0893ffb
--- /dev/null
+++ b/drivers/power/pm2301_charger.c
@@ -0,0 +1,1269 @@
+/*
+ * Copyright 2012 ST Ericsson.
+ *
+ * Power supply driver for ST Ericsson pm2xxx_charger charger
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/abx500/ab8500.h>
+#include <linux/mfd/abx500/ab8500-bm.h>
+#include <linux/mfd/abx500/ux500_chargalg.h>
+#include <linux/pm2301_charger.h>
+#include <linux/gpio.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm.h>
+
+#include "pm2301_charger.h"
+
+#define to_pm2xxx_charger_ac_device_info(x) container_of((x), \
+		struct pm2xxx_charger, ac_chg)
+#define SLEEP_MIN		50
+#define SLEEP_MAX		100
+#define PM2XXX_AUTOSUSPEND_DELAY 500
+
+static int pm2xxx_interrupt_registers[] = {
+	PM2XXX_REG_INT1,
+	PM2XXX_REG_INT2,
+	PM2XXX_REG_INT3,
+	PM2XXX_REG_INT4,
+	PM2XXX_REG_INT5,
+	PM2XXX_REG_INT6,
+};
+
+static enum power_supply_property pm2xxx_charger_ac_props[] = {
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+};
+
+static int pm2xxx_charger_voltage_map[] = {
+	3500,
+	3525,
+	3550,
+	3575,
+	3600,
+	3625,
+	3650,
+	3675,
+	3700,
+	3725,
+	3750,
+	3775,
+	3800,
+	3825,
+	3850,
+	3875,
+	3900,
+	3925,
+	3950,
+	3975,
+	4000,
+	4025,
+	4050,
+	4075,
+	4100,
+	4125,
+	4150,
+	4175,
+	4200,
+	4225,
+	4250,
+	4275,
+	4300,
+};
+
+static int pm2xxx_charger_current_map[] = {
+	200,
+	200,
+	400,
+	600,
+	800,
+	1000,
+	1200,
+	1400,
+	1600,
+	1800,
+	2000,
+	2200,
+	2400,
+	2600,
+	2800,
+	3000,
+};
+
+static const struct i2c_device_id pm2xxx_ident[] = {
+	{ "pm2301", 0 },
+	{ }
+};
+
+static void set_lpn_pin(struct pm2xxx_charger *pm2)
+{
+	if (!pm2->ac.charger_connected && gpio_is_valid(pm2->lpn_pin)) {
+		gpio_set_value(pm2->lpn_pin, 1);
+		usleep_range(SLEEP_MIN, SLEEP_MAX);
+	}
+}
+
+static void clear_lpn_pin(struct pm2xxx_charger *pm2)
+{
+	if (!pm2->ac.charger_connected && gpio_is_valid(pm2->lpn_pin))
+		gpio_set_value(pm2->lpn_pin, 0);
+}
+
+static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
+{
+	int ret;
+
+	/* wake up the device */
+	pm_runtime_get_sync(pm2->dev);
+
+	ret = i2c_smbus_read_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
+				1, val);
+	if (ret < 0)
+		dev_err(pm2->dev, "Error reading register at 0x%x\n", reg);
+	else
+		ret = 0;
+
+	pm_runtime_put_sync(pm2->dev);
+
+	return ret;
+}
+
+static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
+{
+	int ret;
+
+	/* wake up the device */
+	pm_runtime_get_sync(pm2->dev);
+
+	ret = i2c_smbus_write_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
+				1, &val);
+	if (ret < 0)
+		dev_err(pm2->dev, "Error writing register at 0x%x\n", reg);
+	else
+		ret = 0;
+
+	pm_runtime_put_sync(pm2->dev);
+
+	return ret;
+}
+
+static int pm2xxx_charging_enable_mngt(struct pm2xxx_charger *pm2)
+{
+	int ret;
+
+	/* Enable charging */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
+			(PM2XXX_CH_AUTO_RESUME_EN | PM2XXX_CHARGER_ENA));
+
+	return ret;
+}
+
+static int pm2xxx_charging_disable_mngt(struct pm2xxx_charger *pm2)
+{
+	int ret;
+
+	/* Disable SW EOC ctrl */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG, PM2XXX_SWCTRL_HW);
+	if (ret < 0) {
+		dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
+		return ret;
+	}
+
+	/* Disable charging */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
+			(PM2XXX_CH_AUTO_RESUME_DIS | PM2XXX_CHARGER_DIS));
+	if (ret < 0) {
+		dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int pm2xxx_charger_batt_therm_mngt(struct pm2xxx_charger *pm2, int val)
+{
+	queue_work(pm2->charger_wq, &pm2->check_main_thermal_prot_work);
+
+	return 0;
+}
+
+
+static int pm2xxx_charger_die_therm_mngt(struct pm2xxx_charger *pm2, int val)
+{
+	queue_work(pm2->charger_wq, &pm2->check_main_thermal_prot_work);
+
+	return 0;
+}
+
+static int pm2xxx_charger_ovv_mngt(struct pm2xxx_charger *pm2, int val)
+{
+	dev_err(pm2->dev, "Overvoltage detected\n");
+	pm2->flags.ovv = true;
+	power_supply_changed(pm2->ac_chg.psy);
+
+	/* Schedule a new HW failure check */
+	queue_delayed_work(pm2->charger_wq, &pm2->check_hw_failure_work, 0);
+
+	return 0;
+}
+
+static int pm2xxx_charger_wd_exp_mngt(struct pm2xxx_charger *pm2, int val)
+{
+	dev_dbg(pm2->dev , "20 minutes watchdog expired\n");
+
+	pm2->ac.wd_expired = true;
+	power_supply_changed(pm2->ac_chg.psy);
+
+	return 0;
+}
+
+static int pm2xxx_charger_vbat_lsig_mngt(struct pm2xxx_charger *pm2, int val)
+{
+	int ret;
+
+	switch (val) {
+	case PM2XXX_INT1_ITVBATLOWR:
+		dev_dbg(pm2->dev, "VBAT grows above VBAT_LOW level\n");
+		/* Enable SW EOC ctrl */
+		ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG,
+							PM2XXX_SWCTRL_SW);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
+			return ret;
+		}
+		break;
+
+	case PM2XXX_INT1_ITVBATLOWF:
+		dev_dbg(pm2->dev, "VBAT drops below VBAT_LOW level\n");
+		/* Disable SW EOC ctrl */
+		ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG,
+							PM2XXX_SWCTRL_HW);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
+			return ret;
+		}
+		break;
+
+	default:
+		dev_err(pm2->dev, "Unknown VBAT level\n");
+	}
+
+	return 0;
+}
+
+static int pm2xxx_charger_bat_disc_mngt(struct pm2xxx_charger *pm2, int val)
+{
+	dev_dbg(pm2->dev, "battery disconnected\n");
+
+	return 0;
+}
+
+static int pm2xxx_charger_detection(struct pm2xxx_charger *pm2, u8 *val)
+{
+	int ret;
+
+	ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT2, val);
+
+	if (ret < 0) {
+		dev_err(pm2->dev, "Charger detection failed\n");
+		goto out;
+	}
+
+	*val &= (PM2XXX_INT2_S_ITVPWR1PLUG | PM2XXX_INT2_S_ITVPWR2PLUG);
+
+out:
+	return ret;
+}
+
+static int pm2xxx_charger_itv_pwr_plug_mngt(struct pm2xxx_charger *pm2, int val)
+{
+
+	int ret;
+	u8 read_val;
+
+	/*
+	 * Since we can't be sure that the events are received
+	 * synchronously, we have the check if the main charger is
+	 * connected by reading the interrupt source register.
+	 */
+	ret = pm2xxx_charger_detection(pm2, &read_val);
+
+	if ((ret == 0) && read_val) {
+		pm2->ac.charger_connected = 1;
+		pm2->ac_conn = true;
+		queue_work(pm2->charger_wq, &pm2->ac_work);
+	}
+
+
+	return ret;
+}
+
+static int pm2xxx_charger_itv_pwr_unplug_mngt(struct pm2xxx_charger *pm2,
+								int val)
+{
+	pm2->ac.charger_connected = 0;
+	queue_work(pm2->charger_wq, &pm2->ac_work);
+
+	return 0;
+}
+
+static int pm2_int_reg0(void *pm2_data, int val)
+{
+	struct pm2xxx_charger *pm2 = pm2_data;
+	int ret = 0;
+
+	if (val & PM2XXX_INT1_ITVBATLOWR) {
+		ret = pm2xxx_charger_vbat_lsig_mngt(pm2,
+						PM2XXX_INT1_ITVBATLOWR);
+		if (ret < 0)
+			goto out;
+	}
+
+	if (val & PM2XXX_INT1_ITVBATLOWF) {
+		ret = pm2xxx_charger_vbat_lsig_mngt(pm2,
+						PM2XXX_INT1_ITVBATLOWF);
+		if (ret < 0)
+			goto out;
+	}
+
+	if (val & PM2XXX_INT1_ITVBATDISCONNECT) {
+		ret = pm2xxx_charger_bat_disc_mngt(pm2,
+				PM2XXX_INT1_ITVBATDISCONNECT);
+		if (ret < 0)
+			goto out;
+	}
+out:
+	return ret;
+}
+
+static int pm2_int_reg1(void *pm2_data, int val)
+{
+	struct pm2xxx_charger *pm2 = pm2_data;
+	int ret = 0;
+
+	if (val & (PM2XXX_INT2_ITVPWR1PLUG | PM2XXX_INT2_ITVPWR2PLUG)) {
+		dev_dbg(pm2->dev , "Main charger plugged\n");
+		ret = pm2xxx_charger_itv_pwr_plug_mngt(pm2, val &
+			(PM2XXX_INT2_ITVPWR1PLUG | PM2XXX_INT2_ITVPWR2PLUG));
+	}
+
+	if (val &
+		(PM2XXX_INT2_ITVPWR1UNPLUG | PM2XXX_INT2_ITVPWR2UNPLUG)) {
+		dev_dbg(pm2->dev , "Main charger unplugged\n");
+		ret = pm2xxx_charger_itv_pwr_unplug_mngt(pm2, val &
+						(PM2XXX_INT2_ITVPWR1UNPLUG |
+						PM2XXX_INT2_ITVPWR2UNPLUG));
+	}
+
+	return ret;
+}
+
+static int pm2_int_reg2(void *pm2_data, int val)
+{
+	struct pm2xxx_charger *pm2 = pm2_data;
+	int ret = 0;
+
+	if (val & PM2XXX_INT3_ITAUTOTIMEOUTWD)
+		ret = pm2xxx_charger_wd_exp_mngt(pm2, val);
+
+	if (val & (PM2XXX_INT3_ITCHPRECHARGEWD |
+				PM2XXX_INT3_ITCHCCWD | PM2XXX_INT3_ITCHCVWD)) {
+		dev_dbg(pm2->dev,
+			"Watchdog occurred for precharge, CC and CV charge\n");
+	}
+
+	return ret;
+}
+
+static int pm2_int_reg3(void *pm2_data, int val)
+{
+	struct pm2xxx_charger *pm2 = pm2_data;
+	int ret = 0;
+
+	if (val & (PM2XXX_INT4_ITCHARGINGON)) {
+		dev_dbg(pm2->dev ,
+			"chargind operation has started\n");
+	}
+
+	if (val & (PM2XXX_INT4_ITVRESUME)) {
+		dev_dbg(pm2->dev,
+			"battery discharged down to VResume threshold\n");
+	}
+
+	if (val & (PM2XXX_INT4_ITBATTFULL)) {
+		dev_dbg(pm2->dev , "battery fully detected\n");
+	}
+
+	if (val & (PM2XXX_INT4_ITCVPHASE)) {
+		dev_dbg(pm2->dev, "CV phase enter with 0.5C charging\n");
+	}
+
+	if (val & (PM2XXX_INT4_ITVPWR2OVV | PM2XXX_INT4_ITVPWR1OVV)) {
+		pm2->failure_case = VPWR_OVV;
+		ret = pm2xxx_charger_ovv_mngt(pm2, val &
+			(PM2XXX_INT4_ITVPWR2OVV | PM2XXX_INT4_ITVPWR1OVV));
+		dev_dbg(pm2->dev, "VPWR/VSYSTEM overvoltage detected\n");
+	}
+
+	if (val & (PM2XXX_INT4_S_ITBATTEMPCOLD |
+				PM2XXX_INT4_S_ITBATTEMPHOT)) {
+		ret = pm2xxx_charger_batt_therm_mngt(pm2, val &
+			(PM2XXX_INT4_S_ITBATTEMPCOLD |
+			PM2XXX_INT4_S_ITBATTEMPHOT));
+		dev_dbg(pm2->dev, "BTEMP is too Low/High\n");
+	}
+
+	return ret;
+}
+
+static int pm2_int_reg4(void *pm2_data, int val)
+{
+	struct pm2xxx_charger *pm2 = pm2_data;
+	int ret = 0;
+
+	if (val & PM2XXX_INT5_ITVSYSTEMOVV) {
+		pm2->failure_case = VSYSTEM_OVV;
+		ret = pm2xxx_charger_ovv_mngt(pm2, val &
+						PM2XXX_INT5_ITVSYSTEMOVV);
+		dev_dbg(pm2->dev, "VSYSTEM overvoltage detected\n");
+	}
+
+	if (val & (PM2XXX_INT5_ITTHERMALWARNINGFALL |
+				PM2XXX_INT5_ITTHERMALWARNINGRISE |
+				PM2XXX_INT5_ITTHERMALSHUTDOWNFALL |
+				PM2XXX_INT5_ITTHERMALSHUTDOWNRISE)) {
+		dev_dbg(pm2->dev, "BTEMP die temperature is too Low/High\n");
+		ret = pm2xxx_charger_die_therm_mngt(pm2, val &
+			(PM2XXX_INT5_ITTHERMALWARNINGFALL |
+			PM2XXX_INT5_ITTHERMALWARNINGRISE |
+			PM2XXX_INT5_ITTHERMALSHUTDOWNFALL |
+			PM2XXX_INT5_ITTHERMALSHUTDOWNRISE));
+	}
+
+	return ret;
+}
+
+static int pm2_int_reg5(void *pm2_data, int val)
+{
+	struct pm2xxx_charger *pm2 = pm2_data;
+	int ret = 0;
+
+	if (val & (PM2XXX_INT6_ITVPWR2DROP | PM2XXX_INT6_ITVPWR1DROP)) {
+		dev_dbg(pm2->dev, "VMPWR drop to VBAT level\n");
+	}
+
+	if (val & (PM2XXX_INT6_ITVPWR2VALIDRISE |
+			PM2XXX_INT6_ITVPWR1VALIDRISE |
+			PM2XXX_INT6_ITVPWR2VALIDFALL |
+			PM2XXX_INT6_ITVPWR1VALIDFALL)) {
+		dev_dbg(pm2->dev, "Falling/Rising edge on WPWR1/2\n");
+	}
+
+	return ret;
+}
+
+static irqreturn_t  pm2xxx_irq_int(int irq, void *data)
+{
+	struct pm2xxx_charger *pm2 = data;
+	struct pm2xxx_interrupts *interrupt = pm2->pm2_int;
+	int i;
+
+	/* wake up the device */
+	pm_runtime_get_sync(pm2->dev);
+
+	do {
+		for (i = 0; i < PM2XXX_NUM_INT_REG; i++) {
+			pm2xxx_reg_read(pm2,
+				pm2xxx_interrupt_registers[i],
+				&(interrupt->reg[i]));
+
+			if (interrupt->reg[i] > 0)
+				interrupt->handler[i](pm2, interrupt->reg[i]);
+		}
+	} while (gpio_get_value(pm2->pdata->gpio_irq_number) == 0);
+
+	pm_runtime_mark_last_busy(pm2->dev);
+	pm_runtime_put_autosuspend(pm2->dev);
+
+	return IRQ_HANDLED;
+}
+
+static int pm2xxx_charger_get_ac_cv(struct pm2xxx_charger *pm2)
+{
+	int ret = 0;
+	u8 val;
+
+	if (pm2->ac.charger_connected && pm2->ac.charger_online) {
+
+		ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT4, &val);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
+			goto out;
+		}
+
+		if (val & PM2XXX_INT4_S_ITCVPHASE)
+			ret = PM2XXX_CONST_VOLT;
+		else
+			ret = PM2XXX_CONST_CURR;
+	}
+out:
+	return ret;
+}
+
+static int pm2xxx_current_to_regval(int curr)
+{
+	int i;
+
+	if (curr < pm2xxx_charger_current_map[0])
+		return 0;
+
+	for (i = 1; i < ARRAY_SIZE(pm2xxx_charger_current_map); i++) {
+		if (curr < pm2xxx_charger_current_map[i])
+			return (i - 1);
+	}
+
+	i = ARRAY_SIZE(pm2xxx_charger_current_map) - 1;
+	if (curr == pm2xxx_charger_current_map[i])
+		return i;
+	else
+		return -EINVAL;
+}
+
+static int pm2xxx_voltage_to_regval(int curr)
+{
+	int i;
+
+	if (curr < pm2xxx_charger_voltage_map[0])
+		return 0;
+
+	for (i = 1; i < ARRAY_SIZE(pm2xxx_charger_voltage_map); i++) {
+		if (curr < pm2xxx_charger_voltage_map[i])
+			return i - 1;
+	}
+
+	i = ARRAY_SIZE(pm2xxx_charger_voltage_map) - 1;
+	if (curr == pm2xxx_charger_voltage_map[i])
+		return i;
+	else
+		return -EINVAL;
+}
+
+static int pm2xxx_charger_update_charger_current(struct ux500_charger *charger,
+		int ich_out)
+{
+	int ret;
+	int curr_index;
+	struct pm2xxx_charger *pm2;
+	u8 val;
+
+	if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
+		pm2 = to_pm2xxx_charger_ac_device_info(charger);
+	else
+		return -ENXIO;
+
+	curr_index = pm2xxx_current_to_regval(ich_out);
+	if (curr_index < 0) {
+		dev_err(pm2->dev,
+			"Charger current too high, charging not started\n");
+		return -ENXIO;
+	}
+
+	ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG6, &val);
+	if (ret >= 0) {
+		val &= ~PM2XXX_DIR_CH_CC_CURRENT_MASK;
+		val |= curr_index;
+		ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6, val);
+		if (ret < 0) {
+			dev_err(pm2->dev,
+				"%s write failed\n", __func__);
+		}
+	}
+	else
+		dev_err(pm2->dev, "%s read failed\n", __func__);
+
+	return ret;
+}
+
+static int pm2xxx_charger_ac_get_property(struct power_supply *psy,
+	enum power_supply_property psp,
+	union power_supply_propval *val)
+{
+	struct pm2xxx_charger *pm2;
+
+	pm2 = to_pm2xxx_charger_ac_device_info(psy_to_ux500_charger(psy));
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_HEALTH:
+		if (pm2->flags.mainextchnotok)
+			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+		else if (pm2->ac.wd_expired)
+			val->intval = POWER_SUPPLY_HEALTH_DEAD;
+		else if (pm2->flags.main_thermal_prot)
+			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+		else if (pm2->flags.ovv)
+			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+		else
+			val->intval = POWER_SUPPLY_HEALTH_GOOD;
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = pm2->ac.charger_online;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = pm2->ac.charger_connected;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		pm2->ac.cv_active = pm2xxx_charger_get_ac_cv(pm2);
+		val->intval = pm2->ac.cv_active;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int pm2xxx_charging_init(struct pm2xxx_charger *pm2)
+{
+	int ret = 0;
+
+	/* enable CC and CV watchdog */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG3,
+		(PM2XXX_CH_WD_CV_PHASE_60MIN | PM2XXX_CH_WD_CC_PHASE_60MIN));
+	if( ret < 0)
+		return ret;
+
+	/* enable precharge watchdog */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG4,
+					PM2XXX_CH_WD_PRECH_PHASE_60MIN);
+
+	/* Disable auto timeout */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG5,
+					PM2XXX_CH_WD_AUTO_TIMEOUT_20MIN);
+
+	/*
+     * EOC current level = 100mA
+	 * Precharge current level = 100mA
+	 * CC current level = 1000mA
+	 */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6,
+		(PM2XXX_DIR_CH_CC_CURRENT_1000MA |
+		PM2XXX_CH_PRECH_CURRENT_100MA |
+		PM2XXX_CH_EOC_CURRENT_100MA));
+
+	/*
+     * recharge threshold = 3.8V
+	 * Precharge to CC threshold = 2.9V
+	 */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG7,
+		(PM2XXX_CH_PRECH_VOL_2_9 | PM2XXX_CH_VRESUME_VOL_3_8));
+
+	/* float voltage charger level = 4.2V */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG8,
+		PM2XXX_CH_VOLT_4_2);
+
+	/* Voltage drop between VBAT and VSYS in HW charging = 300mV */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG9,
+		(PM2XXX_CH_150MV_DROP_300MV | PM2XXX_CHARCHING_INFO_DIS |
+		PM2XXX_CH_CC_REDUCED_CURRENT_IDENT |
+		PM2XXX_CH_CC_MODEDROP_DIS));
+
+	/* Input charger level of over voltage = 10V */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_INP_VOLT_VPWR2,
+					PM2XXX_VPWR2_OVV_10);
+	ret = pm2xxx_reg_write(pm2, PM2XXX_INP_VOLT_VPWR1,
+					PM2XXX_VPWR1_OVV_10);
+
+	/* Input charger drop */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_INP_DROP_VPWR2,
+		(PM2XXX_VPWR2_HW_OPT_DIS | PM2XXX_VPWR2_VALID_DIS |
+		PM2XXX_VPWR2_DROP_DIS));
+	ret = pm2xxx_reg_write(pm2, PM2XXX_INP_DROP_VPWR1,
+		(PM2XXX_VPWR1_HW_OPT_DIS | PM2XXX_VPWR1_VALID_DIS |
+		PM2XXX_VPWR1_DROP_DIS));
+
+	/* Disable battery low monitoring */
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_LOW_LEV_COMP_REG,
+		PM2XXX_VBAT_LOW_MONITORING_ENA);
+
+	return ret;
+}
+
+static int pm2xxx_charger_ac_en(struct ux500_charger *charger,
+	int enable, int vset, int iset)
+{
+	int ret;
+	int volt_index;
+	int curr_index;
+	u8 val;
+
+	struct pm2xxx_charger *pm2 = to_pm2xxx_charger_ac_device_info(charger);
+
+	if (enable) {
+		if (!pm2->ac.charger_connected) {
+			dev_dbg(pm2->dev, "AC charger not connected\n");
+			return -ENXIO;
+		}
+
+		dev_dbg(pm2->dev, "Enable AC: %dmV %dmA\n", vset, iset);
+		if (!pm2->vddadc_en_ac) {
+			ret = regulator_enable(pm2->regu);
+			if (ret)
+				dev_warn(pm2->dev,
+					"Failed to enable vddadc regulator\n");
+			else
+				pm2->vddadc_en_ac = true;
+		}
+
+		ret = pm2xxx_charging_init(pm2);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s charging init failed\n",
+					__func__);
+			goto error_occured;
+		}
+
+		volt_index = pm2xxx_voltage_to_regval(vset);
+		curr_index = pm2xxx_current_to_regval(iset);
+
+		if (volt_index < 0 || curr_index < 0) {
+			dev_err(pm2->dev,
+				"Charger voltage or current too high, "
+				"charging not started\n");
+			return -ENXIO;
+		}
+
+		ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG8, &val);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
+			goto error_occured;
+		}
+		val &= ~PM2XXX_CH_VOLT_MASK;
+		val |= volt_index;
+		ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG8, val);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
+			goto error_occured;
+		}
+
+		ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG6, &val);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
+			goto error_occured;
+		}
+		val &= ~PM2XXX_DIR_CH_CC_CURRENT_MASK;
+		val |= curr_index;
+		ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6, val);
+		if (ret < 0) {
+			dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
+			goto error_occured;
+		}
+
+		if (!pm2->bat->enable_overshoot) {
+			ret = pm2xxx_reg_read(pm2, PM2XXX_LED_CTRL_REG, &val);
+			if (ret < 0) {
+				dev_err(pm2->dev, "%s pm2xxx read failed\n",
+								__func__);
+				goto error_occured;
+			}
+			val |= PM2XXX_ANTI_OVERSHOOT_EN;
+			ret = pm2xxx_reg_write(pm2, PM2XXX_LED_CTRL_REG, val);
+			if (ret < 0) {
+				dev_err(pm2->dev, "%s pm2xxx write failed\n",
+								__func__);
+				goto error_occured;
+			}
+		}
+
+		ret = pm2xxx_charging_enable_mngt(pm2);
+		if (ret < 0) {
+			dev_err(pm2->dev, "Failed to enable"
+						"pm2xxx ac charger\n");
+			goto error_occured;
+		}
+
+		pm2->ac.charger_online = 1;
+	} else {
+		pm2->ac.charger_online = 0;
+		pm2->ac.wd_expired = false;
+
+		/* Disable regulator if enabled */
+		if (pm2->vddadc_en_ac) {
+			regulator_disable(pm2->regu);
+			pm2->vddadc_en_ac = false;
+		}
+
+		ret = pm2xxx_charging_disable_mngt(pm2);
+		if (ret < 0) {
+			dev_err(pm2->dev, "failed to disable"
+						"pm2xxx ac charger\n");
+			goto error_occured;
+		}
+
+		dev_dbg(pm2->dev, "PM2301: " "Disabled AC charging\n");
+	}
+	power_supply_changed(pm2->ac_chg.psy);
+
+error_occured:
+	return ret;
+}
+
+static int pm2xxx_charger_watchdog_kick(struct ux500_charger *charger)
+{
+	int ret;
+	struct pm2xxx_charger *pm2;
+
+	if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
+		pm2 = to_pm2xxx_charger_ac_device_info(charger);
+	else
+		return -ENXIO;
+
+	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_WD_KICK, WD_TIMER);
+	if (ret)
+		dev_err(pm2->dev, "Failed to kick WD!\n");
+
+	return ret;
+}
+
+static void pm2xxx_charger_ac_work(struct work_struct *work)
+{
+	struct pm2xxx_charger *pm2 = container_of(work,
+		struct pm2xxx_charger, ac_work);
+
+
+	power_supply_changed(pm2->ac_chg.psy);
+	sysfs_notify(&pm2->ac_chg.psy->dev.kobj, NULL, "present");
+};
+
+static void pm2xxx_charger_check_hw_failure_work(struct work_struct *work)
+{
+	u8 reg_value;
+
+	struct pm2xxx_charger *pm2 = container_of(work,
+		struct pm2xxx_charger, check_hw_failure_work.work);
+
+	if (pm2->flags.ovv) {
+		pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT4, &reg_value);
+
+		if (!(reg_value & (PM2XXX_INT4_S_ITVPWR1OVV |
+					PM2XXX_INT4_S_ITVPWR2OVV))) {
+			pm2->flags.ovv = false;
+			power_supply_changed(pm2->ac_chg.psy);
+		}
+	}
+
+	/* If we still have a failure, schedule a new check */
+	if (pm2->flags.ovv) {
+		queue_delayed_work(pm2->charger_wq,
+			&pm2->check_hw_failure_work, round_jiffies(HZ));
+	}
+}
+
+static void pm2xxx_charger_check_main_thermal_prot_work(
+	struct work_struct *work)
+{
+	int ret;
+	u8 val;
+
+	struct pm2xxx_charger *pm2 = container_of(work, struct pm2xxx_charger,
+					check_main_thermal_prot_work);
+
+	/* Check if die temp warning is still active */
+	ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT5, &val);
+	if (ret < 0) {
+		dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
+		return;
+	}
+	if (val & (PM2XXX_INT5_S_ITTHERMALWARNINGRISE
+			| PM2XXX_INT5_S_ITTHERMALSHUTDOWNRISE))
+		pm2->flags.main_thermal_prot = true;
+	else if (val & (PM2XXX_INT5_S_ITTHERMALWARNINGFALL
+				| PM2XXX_INT5_S_ITTHERMALSHUTDOWNFALL))
+		pm2->flags.main_thermal_prot = false;
+
+	power_supply_changed(pm2->ac_chg.psy);
+}
+
+static struct pm2xxx_interrupts pm2xxx_int = {
+	.handler[0] = pm2_int_reg0,
+	.handler[1] = pm2_int_reg1,
+	.handler[2] = pm2_int_reg2,
+	.handler[3] = pm2_int_reg3,
+	.handler[4] = pm2_int_reg4,
+	.handler[5] = pm2_int_reg5,
+};
+
+static struct pm2xxx_irq pm2xxx_charger_irq[] = {
+	{"PM2XXX_IRQ_INT", pm2xxx_irq_int},
+};
+
+#ifdef CONFIG_PM
+
+#ifdef CONFIG_PM_SLEEP
+
+static int pm2xxx_wall_charger_resume(struct device *dev)
+{
+	struct i2c_client *i2c_client = to_i2c_client(dev);
+	struct pm2xxx_charger *pm2;
+
+	pm2 =  (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
+	set_lpn_pin(pm2);
+
+	/* If we still have a HW failure, schedule a new check */
+	if (pm2->flags.ovv)
+		queue_delayed_work(pm2->charger_wq,
+				&pm2->check_hw_failure_work, 0);
+
+	return 0;
+}
+
+static int pm2xxx_wall_charger_suspend(struct device *dev)
+{
+	struct i2c_client *i2c_client = to_i2c_client(dev);
+	struct pm2xxx_charger *pm2;
+
+	pm2 =  (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
+	clear_lpn_pin(pm2);
+
+	/* Cancel any pending HW failure check */
+	if (delayed_work_pending(&pm2->check_hw_failure_work))
+		cancel_delayed_work(&pm2->check_hw_failure_work);
+
+	flush_work(&pm2->ac_work);
+	flush_work(&pm2->check_main_thermal_prot_work);
+
+	return 0;
+}
+
+#endif
+
+static int  pm2xxx_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
+	struct pm2xxx_charger *pm2;
+
+	pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(pm2xxx_i2c_client);
+	clear_lpn_pin(pm2);
+
+	return 0;
+}
+
+static int  pm2xxx_runtime_resume(struct device *dev)
+{
+	struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
+	struct pm2xxx_charger *pm2;
+
+	pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(pm2xxx_i2c_client);
+
+	if (gpio_is_valid(pm2->lpn_pin) && gpio_get_value(pm2->lpn_pin) == 0)
+		set_lpn_pin(pm2);
+
+	return 0;
+}
+
+static const struct dev_pm_ops pm2xxx_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(pm2xxx_wall_charger_suspend,
+		pm2xxx_wall_charger_resume)
+	SET_RUNTIME_PM_OPS(pm2xxx_runtime_suspend, pm2xxx_runtime_resume, NULL)
+};
+#define  PM2XXX_PM_OPS (&pm2xxx_pm_ops)
+#else
+#define  PM2XXX_PM_OPS  NULL
+#endif
+
+static int pm2xxx_wall_charger_probe(struct i2c_client *i2c_client,
+		const struct i2c_device_id *id)
+{
+	struct pm2xxx_platform_data *pl_data = i2c_client->dev.platform_data;
+	struct power_supply_config psy_cfg = {};
+	struct pm2xxx_charger *pm2;
+	int ret = 0;
+	u8 val;
+	int i;
+
+	if (!pl_data) {
+		dev_err(&i2c_client->dev, "No platform data supplied\n");
+		return -EINVAL;
+	}
+
+	pm2 = kzalloc(sizeof(struct pm2xxx_charger), GFP_KERNEL);
+	if (!pm2) {
+		dev_err(&i2c_client->dev, "pm2xxx_charger allocation failed\n");
+		return -ENOMEM;
+	}
+
+	/* get parent data */
+	pm2->dev = &i2c_client->dev;
+
+	pm2->pm2_int = &pm2xxx_int;
+
+	/* get charger spcific platform data */
+	if (!pl_data->wall_charger) {
+		dev_err(pm2->dev, "no charger platform data supplied\n");
+		ret = -EINVAL;
+		goto free_device_info;
+	}
+
+	pm2->pdata = pl_data->wall_charger;
+
+	/* get battery specific platform data */
+	if (!pl_data->battery) {
+		dev_err(pm2->dev, "no battery platform data supplied\n");
+		ret = -EINVAL;
+		goto free_device_info;
+	}
+
+	pm2->bat = pl_data->battery;
+
+	if (!i2c_check_functionality(i2c_client->adapter,
+			I2C_FUNC_SMBUS_BYTE_DATA |
+			I2C_FUNC_SMBUS_READ_WORD_DATA)) {
+		ret = -ENODEV;
+		dev_info(pm2->dev, "pm2301 i2c_check_functionality failed\n");
+		goto free_device_info;
+	}
+
+	pm2->config.pm2xxx_i2c = i2c_client;
+	pm2->config.pm2xxx_id = (struct i2c_device_id *) id;
+	i2c_set_clientdata(i2c_client, pm2);
+
+	/* AC supply */
+	/* power_supply base class */
+	pm2->ac_chg_desc.name = pm2->pdata->label;
+	pm2->ac_chg_desc.type = POWER_SUPPLY_TYPE_MAINS;
+	pm2->ac_chg_desc.properties = pm2xxx_charger_ac_props;
+	pm2->ac_chg_desc.num_properties = ARRAY_SIZE(pm2xxx_charger_ac_props);
+	pm2->ac_chg_desc.get_property = pm2xxx_charger_ac_get_property;
+
+	psy_cfg.supplied_to = pm2->pdata->supplied_to;
+	psy_cfg.num_supplicants = pm2->pdata->num_supplicants;
+	/* pm2xxx_charger sub-class */
+	pm2->ac_chg.ops.enable = &pm2xxx_charger_ac_en;
+	pm2->ac_chg.ops.kick_wd = &pm2xxx_charger_watchdog_kick;
+	pm2->ac_chg.ops.update_curr = &pm2xxx_charger_update_charger_current;
+	pm2->ac_chg.max_out_volt = pm2xxx_charger_voltage_map[
+		ARRAY_SIZE(pm2xxx_charger_voltage_map) - 1];
+	pm2->ac_chg.max_out_curr = pm2xxx_charger_current_map[
+		ARRAY_SIZE(pm2xxx_charger_current_map) - 1];
+	pm2->ac_chg.wdt_refresh = WD_KICK_INTERVAL;
+	pm2->ac_chg.enabled = true;
+	pm2->ac_chg.external = true;
+
+	/* Create a work queue for the charger */
+	pm2->charger_wq = create_singlethread_workqueue("pm2xxx_charger_wq");
+	if (pm2->charger_wq == NULL) {
+		ret = -ENOMEM;
+		dev_err(pm2->dev, "failed to create work queue\n");
+		goto free_device_info;
+	}
+
+	/* Init work for charger detection */
+	INIT_WORK(&pm2->ac_work, pm2xxx_charger_ac_work);
+
+	/* Init work for checking HW status */
+	INIT_WORK(&pm2->check_main_thermal_prot_work,
+		pm2xxx_charger_check_main_thermal_prot_work);
+
+	/* Init work for HW failure check */
+	INIT_DEFERRABLE_WORK(&pm2->check_hw_failure_work,
+		pm2xxx_charger_check_hw_failure_work);
+
+	/*
+	 * VDD ADC supply needs to be enabled from this driver when there
+	 * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
+	 * interrupts during charging
+	 */
+	pm2->regu = regulator_get(pm2->dev, "vddadc");
+	if (IS_ERR(pm2->regu)) {
+		ret = PTR_ERR(pm2->regu);
+		dev_err(pm2->dev, "failed to get vddadc regulator\n");
+		goto free_charger_wq;
+	}
+
+	/* Register AC charger class */
+	pm2->ac_chg.psy = power_supply_register(pm2->dev, &pm2->ac_chg_desc,
+						&psy_cfg);
+	if (IS_ERR(pm2->ac_chg.psy)) {
+		dev_err(pm2->dev, "failed to register AC charger\n");
+		ret = PTR_ERR(pm2->ac_chg.psy);
+		goto free_regulator;
+	}
+
+	/* Register interrupts */
+	ret = request_threaded_irq(gpio_to_irq(pm2->pdata->gpio_irq_number),
+				NULL,
+				pm2xxx_charger_irq[0].isr,
+				pm2->pdata->irq_type,
+				pm2xxx_charger_irq[0].name, pm2);
+
+	if (ret != 0) {
+		dev_err(pm2->dev, "failed to request %s IRQ %d: %d\n",
+		pm2xxx_charger_irq[0].name,
+			gpio_to_irq(pm2->pdata->gpio_irq_number), ret);
+		goto unregister_pm2xxx_charger;
+	}
+
+	ret = pm_runtime_set_active(pm2->dev);
+	if (ret)
+		dev_err(pm2->dev, "set active Error\n");
+
+	pm_runtime_enable(pm2->dev);
+	pm_runtime_set_autosuspend_delay(pm2->dev, PM2XXX_AUTOSUSPEND_DELAY);
+	pm_runtime_use_autosuspend(pm2->dev);
+	pm_runtime_resume(pm2->dev);
+
+	/* pm interrupt can wake up system */
+	ret = enable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
+	if (ret) {
+		dev_err(pm2->dev, "failed to set irq wake\n");
+		goto unregister_pm2xxx_interrupt;
+	}
+
+	mutex_init(&pm2->lock);
+
+	if (gpio_is_valid(pm2->pdata->lpn_gpio)) {
+		/* get lpn GPIO from platform data */
+		pm2->lpn_pin = pm2->pdata->lpn_gpio;
+
+		/*
+		 * Charger detection mechanism requires pulling up the LPN pin
+		 * while i2c communication if Charger is not connected
+		 * LPN pin of PM2301 is GPIO60 of AB9540
+		 */
+		ret = gpio_request(pm2->lpn_pin, "pm2301_lpm_gpio");
+
+		if (ret < 0) {
+			dev_err(pm2->dev, "pm2301_lpm_gpio request failed\n");
+			goto disable_pm2_irq_wake;
+		}
+		ret = gpio_direction_output(pm2->lpn_pin, 0);
+		if (ret < 0) {
+			dev_err(pm2->dev, "pm2301_lpm_gpio direction failed\n");
+			goto free_gpio;
+		}
+		set_lpn_pin(pm2);
+	}
+
+	/* read  interrupt registers */
+	for (i = 0; i < PM2XXX_NUM_INT_REG; i++)
+		pm2xxx_reg_read(pm2,
+			pm2xxx_interrupt_registers[i],
+			&val);
+
+	ret = pm2xxx_charger_detection(pm2, &val);
+
+	if ((ret == 0) && val) {
+		pm2->ac.charger_connected = 1;
+		ab8500_override_turn_on_stat(~AB8500_POW_KEY_1_ON,
+					     AB8500_MAIN_CH_DET);
+		pm2->ac_conn = true;
+		power_supply_changed(pm2->ac_chg.psy);
+		sysfs_notify(&pm2->ac_chg.psy->dev.kobj, NULL, "present");
+	}
+
+	return 0;
+
+free_gpio:
+	if (gpio_is_valid(pm2->lpn_pin))
+		gpio_free(pm2->lpn_pin);
+disable_pm2_irq_wake:
+	disable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
+unregister_pm2xxx_interrupt:
+	/* disable interrupt */
+	free_irq(gpio_to_irq(pm2->pdata->gpio_irq_number), pm2);
+unregister_pm2xxx_charger:
+	/* unregister power supply */
+	power_supply_unregister(pm2->ac_chg.psy);
+free_regulator:
+	/* disable the regulator */
+	regulator_put(pm2->regu);
+free_charger_wq:
+	destroy_workqueue(pm2->charger_wq);
+free_device_info:
+	kfree(pm2);
+
+	return ret;
+}
+
+static int pm2xxx_wall_charger_remove(struct i2c_client *i2c_client)
+{
+	struct pm2xxx_charger *pm2 = i2c_get_clientdata(i2c_client);
+
+	/* Disable pm_runtime */
+	pm_runtime_disable(pm2->dev);
+	/* Disable AC charging */
+	pm2xxx_charger_ac_en(&pm2->ac_chg, false, 0, 0);
+
+	/* Disable wake by pm interrupt */
+	disable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
+
+	/* Disable interrupts */
+	free_irq(gpio_to_irq(pm2->pdata->gpio_irq_number), pm2);
+
+	/* Delete the work queue */
+	destroy_workqueue(pm2->charger_wq);
+
+	flush_scheduled_work();
+
+	/* disable the regulator */
+	regulator_put(pm2->regu);
+
+	power_supply_unregister(pm2->ac_chg.psy);
+
+	if (gpio_is_valid(pm2->lpn_pin))
+		gpio_free(pm2->lpn_pin);
+
+	kfree(pm2);
+
+	return 0;
+}
+
+static const struct i2c_device_id pm2xxx_id[] = {
+	{ "pm2301", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, pm2xxx_id);
+
+static struct i2c_driver pm2xxx_charger_driver = {
+	.probe = pm2xxx_wall_charger_probe,
+	.remove = pm2xxx_wall_charger_remove,
+	.driver = {
+		.name = "pm2xxx-wall_charger",
+		.owner = THIS_MODULE,
+		.pm = PM2XXX_PM_OPS,
+	},
+	.id_table = pm2xxx_id,
+};
+
+static int __init pm2xxx_charger_init(void)
+{
+	return i2c_add_driver(&pm2xxx_charger_driver);
+}
+
+static void __exit pm2xxx_charger_exit(void)
+{
+	i2c_del_driver(&pm2xxx_charger_driver);
+}
+
+device_initcall_sync(pm2xxx_charger_init);
+module_exit(pm2xxx_charger_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Rajkumar kasirajan, Olivier Launay");
+MODULE_ALIAS("i2c:pm2xxx-charger");
+MODULE_DESCRIPTION("PM2xxx charger management driver");