drivers/power/pm8921-charger.c

/* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 */
#define pr_fmt(fmt)	"%s: " fmt, __func__

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/mfd/pm8xxx/pm8921-charger.h>
#include <linux/mfd/pm8xxx/pm8921-bms.h>
#include <linux/mfd/pm8921-adc.h>
#include <linux/mfd/pm8xxx/core.h>
#include <linux/interrupt.h>
#include <linux/power_supply.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/slab.h>

#include <mach/msm_xo.h>
#include <mach/msm_hsusb.h>

#define CHG_BUCK_CLOCK_CTRL	0x14

#define PBL_ACCESS1		0x04
#define PBL_ACCESS2		0x05
#define SYS_CONFIG_1		0x06
#define SYS_CONFIG_2		0x07
#define CHG_CNTRL		0x204
#define CHG_IBAT_MAX		0x205
#define CHG_TEST		0x206
#define CHG_BUCK_CTRL_TEST1	0x207
#define CHG_BUCK_CTRL_TEST2	0x208
#define CHG_BUCK_CTRL_TEST3	0x209
#define COMPARATOR_OVERRIDE	0x20A
#define PSI_TXRX_SAMPLE_DATA_0	0x20B
#define PSI_TXRX_SAMPLE_DATA_1	0x20C
#define PSI_TXRX_SAMPLE_DATA_2	0x20D
#define PSI_TXRX_SAMPLE_DATA_3	0x20E
#define PSI_CONFIG_STATUS	0x20F
#define CHG_IBAT_SAFE		0x210
#define CHG_ITRICKLE		0x211
#define CHG_CNTRL_2		0x212
#define CHG_VBAT_DET		0x213
#define CHG_VTRICKLE		0x214
#define CHG_ITERM		0x215
#define CHG_CNTRL_3		0x216
#define CHG_VIN_MIN		0x217
#define CHG_TWDOG		0x218
#define CHG_TTRKL_MAX		0x219
#define CHG_TEMP_THRESH		0x21A
#define CHG_TCHG_MAX		0x21B
#define USB_OVP_CONTROL		0x21C
#define DC_OVP_CONTROL		0x21D
#define USB_OVP_TEST		0x21E
#define DC_OVP_TEST		0x21F
#define CHG_VDD_MAX		0x220
#define CHG_VDD_SAFE		0x221
#define CHG_VBAT_BOOT_THRESH	0x222
#define USB_OVP_TRIM		0x355
#define BUCK_CONTROL_TRIM1	0x356
#define BUCK_CONTROL_TRIM2	0x357
#define BUCK_CONTROL_TRIM3	0x358
#define BUCK_CONTROL_TRIM4	0x359
#define CHG_DEFAULTS_TRIM	0x35A
#define CHG_ITRIM		0x35B
#define CHG_TTRIM		0x35C
#define CHG_COMP_OVR		0x20A

enum chg_fsm_state {
	FSM_STATE_OFF_0 = 0,
	FSM_STATE_BATFETDET_START_12 = 12,
	FSM_STATE_BATFETDET_END_16 = 16,
	FSM_STATE_ON_CHG_HIGHI_1 = 1,
	FSM_STATE_ATC_2A = 2,
	FSM_STATE_ATC_2B = 18,
	FSM_STATE_ON_BAT_3 = 3,
	FSM_STATE_ATC_FAIL_4 = 4 ,
	FSM_STATE_DELAY_5 = 5,
	FSM_STATE_ON_CHG_AND_BAT_6 = 6,
	FSM_STATE_FAST_CHG_7 = 7,
	FSM_STATE_TRKL_CHG_8 = 8,
	FSM_STATE_CHG_FAIL_9 = 9,
	FSM_STATE_EOC_10 = 10,
	FSM_STATE_ON_CHG_VREGOK_11 = 11,
	FSM_STATE_ATC_PAUSE_13 = 13,
	FSM_STATE_FAST_CHG_PAUSE_14 = 14,
	FSM_STATE_TRKL_CHG_PAUSE_15 = 15,
	FSM_STATE_START_BOOT = 20,
	FSM_STATE_FLCB_VREGOK = 21,
	FSM_STATE_FLCB = 22,
};

enum pmic_chg_interrupts {
	USBIN_VALID_IRQ = 0,
	USBIN_OV_IRQ,
	BATT_INSERTED_IRQ,
	VBATDET_LOW_IRQ,
	USBIN_UV_IRQ,
	VBAT_OV_IRQ,
	CHGWDOG_IRQ,
	VCP_IRQ,
	ATCDONE_IRQ,
	ATCFAIL_IRQ,
	CHGDONE_IRQ,
	CHGFAIL_IRQ,
	CHGSTATE_IRQ,
	LOOP_CHANGE_IRQ,
	FASTCHG_IRQ,
	TRKLCHG_IRQ,
	BATT_REMOVED_IRQ,
	BATTTEMP_HOT_IRQ,
	CHGHOT_IRQ,
	BATTTEMP_COLD_IRQ,
	CHG_GONE_IRQ,
	BAT_TEMP_OK_IRQ,
	COARSE_DET_LOW_IRQ,
	VDD_LOOP_IRQ,
	VREG_OV_IRQ,
	VBATDET_IRQ,
	BATFET_IRQ,
	PSI_IRQ,
	DCIN_VALID_IRQ,
	DCIN_OV_IRQ,
	DCIN_UV_IRQ,
	PM_CHG_MAX_INTS,
};

struct bms_notify {
	int			is_charging;
	struct	work_struct	work;
};

/**
 * struct pm8921_chg_chip -device information
 * @dev:			device pointer to access the parent
 * @is_usb_path_used:		indicates whether USB charging is used at all
 * @is_usb_path_used:		indicates whether DC charging is used at all
 * @usb_present:		present status of usb
 * @dc_present:			present status of dc
 * @usb_charger_current:	usb current to charge the battery with used when
 *				the usb path is enabled or charging is resumed
 * @safety_time:		max time for which charging will happen
 * @update_time:		how frequently the userland needs to be updated
 * @max_voltage:		the max volts the batt should be charged up to
 * @min_voltage:		the min battery voltage before turning the FETon
 * @resume_voltage:		the voltage at which the battery should resume
 *				charging
 * @term_current:		The charging based term current
 *
 */
struct pm8921_chg_chip {
	struct device		*dev;
	unsigned int		usb_present;
	unsigned int		dc_present;
	unsigned int		usb_charger_current;
	unsigned int		max_bat_chg_current;
	unsigned int		pmic_chg_irq[PM_CHG_MAX_INTS];
	unsigned int		safety_time;
	unsigned int		ttrkl_time;
	unsigned int		update_time;
	unsigned int		max_voltage;
	unsigned int		min_voltage;
	unsigned int		cool_temp;
	unsigned int		warm_temp;
	unsigned int		temp_check_period;
	unsigned int		cool_bat_chg_current;
	unsigned int		warm_bat_chg_current;
	unsigned int		cool_bat_voltage;
	unsigned int		warm_bat_voltage;
	unsigned int		resume_voltage;
	unsigned int		term_current;
	unsigned int		vbat_channel;
	unsigned int		batt_temp_channel;
	unsigned int		batt_id_channel;
	struct power_supply	usb_psy;
	struct power_supply	dc_psy;
	struct power_supply	batt_psy;
	struct dentry		*dent;
	struct bms_notify	bms_notify;
	DECLARE_BITMAP(enabled_irqs, PM_CHG_MAX_INTS);
	struct work_struct	battery_id_valid_work;
	int64_t			batt_id_min;
	int64_t			batt_id_max;
};

static int charging_disabled;

static struct pm8921_chg_chip *the_chip;

static struct pm8921_adc_arb_btm_param btm_config;

static int pm_chg_masked_write(struct pm8921_chg_chip *chip, u16 addr,
							u8 mask, u8 val)
{
	int rc;
	u8 reg;

	rc = pm8xxx_readb(chip->dev->parent, addr, &reg);
	if (rc) {
		pr_err("pm8xxx_readb failed: addr=%03X, rc=%d\n", addr, rc);
		return rc;
	}
	reg &= ~mask;
	reg |= val & mask;
	rc = pm8xxx_writeb(chip->dev->parent, addr, reg);
	if (rc) {
		pr_err("pm8xxx_writeb failed: addr=%03X, rc=%d\n", addr, rc);
		return rc;
	}
	return 0;
}

#define CAPTURE_FSM_STATE_CMD	0xC2
#define READ_BANK_7		0x70
#define READ_BANK_4		0x40
static int pm_chg_get_fsm_state(struct pm8921_chg_chip *chip)
{
	u8 temp;
	int err, ret = 0;

	temp = CAPTURE_FSM_STATE_CMD;
	err = pm8xxx_writeb(chip->dev->parent, CHG_TEST, temp);
	if (err) {
		pr_err("Error %d writing %d to addr %d\n", err, temp, CHG_TEST);
		return err;
	}

	temp = READ_BANK_7;
	err = pm8xxx_writeb(chip->dev->parent, CHG_TEST, temp);
	if (err) {
		pr_err("Error %d writing %d to addr %d\n", err, temp, CHG_TEST);
		return err;
	}

	err = pm8xxx_readb(chip->dev->parent, CHG_TEST, &temp);
	if (err) {
		pr_err("pm8xxx_readb fail: addr=%03X, rc=%d\n", CHG_TEST, err);
		return err;
	}
	/* get the lower 4 bits */
	ret = temp & 0xF;

	temp = READ_BANK_4;
	err = pm8xxx_writeb(chip->dev->parent, CHG_TEST, temp);
	if (err) {
		pr_err("Error %d writing %d to addr %d\n", err, temp, CHG_TEST);
		return err;
	}

	err = pm8xxx_readb(chip->dev->parent, CHG_TEST, &temp);
	if (err) {
		pr_err("pm8xxx_readb fail: addr=%03X, rc=%d\n", CHG_TEST, err);
		return err;
	}
	/* get the upper 1 bit */
	ret |= (temp & 0x1) << 4;
	return  ret;
}

#define CHG_USB_SUSPEND_BIT  BIT(2)
static int pm_chg_usb_suspend_enable(struct pm8921_chg_chip *chip, int enable)
{
	return pm_chg_masked_write(chip, CHG_CNTRL_3, CHG_USB_SUSPEND_BIT,
			enable ? CHG_USB_SUSPEND_BIT : 0);
}

#define CHG_EN_BIT	BIT(7)
static int pm_chg_auto_enable(struct pm8921_chg_chip *chip, int enable)
{
	return pm_chg_masked_write(chip, CHG_CNTRL_3, CHG_EN_BIT,
				enable ? CHG_EN_BIT : 0);
}

#define CHG_CHARGE_DIS_BIT	BIT(1)
static int pm_chg_charge_dis(struct pm8921_chg_chip *chip, int disable)
{
	return pm_chg_masked_write(chip, CHG_CNTRL, CHG_CHARGE_DIS_BIT,
				disable ? CHG_CHARGE_DIS_BIT : 0);
}

#define PM8921_CHG_V_MIN_MV	3240
#define PM8921_CHG_V_STEP_MV	20
#define PM8921_CHG_VDDMAX_MAX	4500
#define PM8921_CHG_VDDMAX_MIN	3400
#define PM8921_CHG_V_MASK	0x7F
static int pm_chg_vddmax_set(struct pm8921_chg_chip *chip, int voltage)
{
	u8 temp;

	if (voltage < PM8921_CHG_VDDMAX_MIN
			|| voltage > PM8921_CHG_VDDMAX_MAX) {
		pr_err("bad mV=%d asked to set\n", voltage);
		return -EINVAL;
	}
	temp = (voltage - PM8921_CHG_V_MIN_MV) / PM8921_CHG_V_STEP_MV;
	pr_debug("voltage=%d setting %02x\n", voltage, temp);
	return pm_chg_masked_write(chip, CHG_VDD_MAX, PM8921_CHG_V_MASK, temp);
}

#define PM8921_CHG_VDDSAFE_MIN	3400
#define PM8921_CHG_VDDSAFE_MAX	4500
static int pm_chg_vddsafe_set(struct pm8921_chg_chip *chip, int voltage)
{
	u8 temp;

	if (voltage < PM8921_CHG_VDDSAFE_MIN
			|| voltage > PM8921_CHG_VDDSAFE_MAX) {
		pr_err("bad mV=%d asked to set\n", voltage);
		return -EINVAL;
	}
	temp = (voltage - PM8921_CHG_V_MIN_MV) / PM8921_CHG_V_STEP_MV;
	pr_debug("voltage=%d setting %02x\n", voltage, temp);
	return pm_chg_masked_write(chip, CHG_VDD_SAFE, PM8921_CHG_V_MASK, temp);
}

#define PM8921_CHG_VBATDET_MIN	3240
#define PM8921_CHG_VBATDET_MAX	5780
static int pm_chg_vbatdet_set(struct pm8921_chg_chip *chip, int voltage)
{
	u8 temp;

	if (voltage < PM8921_CHG_VBATDET_MIN
			|| voltage > PM8921_CHG_VBATDET_MAX) {
		pr_err("bad mV=%d asked to set\n", voltage);
		return -EINVAL;
	}
	temp = (voltage - PM8921_CHG_V_MIN_MV) / PM8921_CHG_V_STEP_MV;
	pr_debug("voltage=%d setting %02x\n", voltage, temp);
	return pm_chg_masked_write(chip, CHG_VBAT_DET, PM8921_CHG_V_MASK, temp);
}

#define PM8921_CHG_IBATMAX_MIN	325
#define PM8921_CHG_IBATMAX_MAX	2000
#define PM8921_CHG_I_MIN_MA	225
#define PM8921_CHG_I_STEP_MA	50
#define PM8921_CHG_I_MASK	0x3F
static int pm_chg_ibatmax_set(struct pm8921_chg_chip *chip, int chg_current)
{
	u8 temp;

	if (chg_current < PM8921_CHG_IBATMAX_MIN
			|| chg_current > PM8921_CHG_IBATMAX_MAX) {
		pr_err("bad mA=%d asked to set\n", chg_current);
		return -EINVAL;
	}
	temp = (chg_current - PM8921_CHG_I_MIN_MA) / PM8921_CHG_I_STEP_MA;
	return pm_chg_masked_write(chip, CHG_IBAT_MAX, PM8921_CHG_I_MASK, temp);
}

#define PM8921_CHG_IBATSAFE_MIN	225
#define PM8921_CHG_IBATSAFE_MAX	3375
static int pm_chg_ibatsafe_set(struct pm8921_chg_chip *chip, int chg_current)
{
	u8 temp;

	if (chg_current < PM8921_CHG_IBATSAFE_MIN
			|| chg_current > PM8921_CHG_IBATSAFE_MAX) {
		pr_err("bad mA=%d asked to set\n", chg_current);
		return -EINVAL;
	}
	temp = (chg_current - PM8921_CHG_I_MIN_MA) / PM8921_CHG_I_STEP_MA;
	return pm_chg_masked_write(chip, CHG_IBAT_SAFE,
						PM8921_CHG_I_MASK, temp);
}

#define PM8921_CHG_ITERM_MIN_MA		50
#define PM8921_CHG_ITERM_MAX_MA		200
#define PM8921_CHG_ITERM_STEP_MA	10
#define PM8921_CHG_ITERM_MASK		0xF
static int pm_chg_iterm_set(struct pm8921_chg_chip *chip, int chg_current)
{
	u8 temp;

	if (chg_current < PM8921_CHG_ITERM_MIN_MA
			|| chg_current > PM8921_CHG_ITERM_MAX_MA) {
		pr_err("bad mA=%d asked to set\n", chg_current);
		return -EINVAL;
	}

	temp = (chg_current - PM8921_CHG_ITERM_MIN_MA)
				/ PM8921_CHG_ITERM_STEP_MA;
	return pm_chg_masked_write(chip, CHG_ITERM, PM8921_CHG_ITERM_MASK,
					 temp);
}

#define PM8921_CHG_IUSB_MASK 0x1C
#define PM8921_CHG_IUSB_MAX  7
#define PM8921_CHG_IUSB_MIN  0
static int pm_chg_iusbmax_set(struct pm8921_chg_chip *chip, int reg_val)
{
	u8 temp;

	if (reg_val < PM8921_CHG_IUSB_MIN || reg_val > PM8921_CHG_IUSB_MAX) {
		pr_err("bad mA=%d asked to set\n", reg_val);
		return -EINVAL;
	}
	temp = reg_val << 2;
	return pm_chg_masked_write(chip, PBL_ACCESS2, PM8921_CHG_IUSB_MASK,
					 temp);
}

#define PM8921_CHG_WD_MASK 0x1F
static int pm_chg_disable_wd(struct pm8921_chg_chip *chip)
{
	/* writing 0 to the wd timer disables it */
	return pm_chg_masked_write(chip, CHG_TWDOG, PM8921_CHG_WD_MASK, 0);
}

#define PM8921_CHG_TCHG_MASK	0x3F
#define PM8921_CHG_TCHG_MIN	4
#define PM8921_CHG_TCHG_MAX	512
#define PM8921_CHG_TCHG_STEP	4
static int pm_chg_tchg_max_set(struct pm8921_chg_chip *chip, int minutes)
{
	u8 temp;

	if (minutes < PM8921_CHG_TCHG_MIN || minutes > PM8921_CHG_TCHG_MAX) {
		pr_err("bad max minutes =%d asked to set\n", minutes);
		return -EINVAL;
	}

	temp = (minutes - 1)/PM8921_CHG_TCHG_STEP;
	return pm_chg_masked_write(chip, CHG_TCHG_MAX, PM8921_CHG_TCHG_MASK,
					 temp);
}

#define PM8921_CHG_TTRKL_MASK	0x1F
#define PM8921_CHG_TTRKL_MIN	1
#define PM8921_CHG_TTRKL_MAX	64
static int pm_chg_ttrkl_max_set(struct pm8921_chg_chip *chip, int minutes)
{
	u8 temp;

	if (minutes < PM8921_CHG_TTRKL_MIN || minutes > PM8921_CHG_TTRKL_MAX) {
		pr_err("bad max minutes =%d asked to set\n", minutes);
		return -EINVAL;
	}

	temp = minutes - 1;
	return pm_chg_masked_write(chip, CHG_TTRKL_MAX, PM8921_CHG_TTRKL_MASK,
					 temp);
}

static int64_t read_battery_id(struct pm8921_chg_chip *chip)
{
	int rc;
	struct pm8921_adc_chan_result result;

	rc = pm8921_adc_read(chip->batt_id_channel, &result);
	if (rc) {
		pr_err("error reading batt id channel = %d, rc = %d\n",
					chip->vbat_channel, rc);
		return rc;
	}
	pr_debug("batt_id phy = %lld meas = 0x%llx\n", result.physical,
						result.measurement);
	return result.physical;
}

static int is_battery_valid(struct pm8921_chg_chip *chip)
{
	int64_t rc;

	if (chip->batt_id_min == 0 && chip->batt_id_max == 0)
		return 1;

	rc = read_battery_id(chip);
	if (rc < 0) {
		pr_err("error reading batt id channel = %d, rc = %lld\n",
					chip->vbat_channel, rc);
		/* assume battery id is valid when adc error happens */
		return 1;
	}

	if (rc < chip->batt_id_min || rc > chip->batt_id_max) {
		pr_err("batt_id phy =%lld is not valid\n", rc);
		return 0;
	}
	return 1;
}

static void check_battery_valid(struct pm8921_chg_chip *chip)
{
	if (is_battery_valid(chip) == 0) {
		pr_err("batt_id not valid, disbling charging\n");
		pm_chg_auto_enable(chip, 0);
	} else {
		pm_chg_auto_enable(chip, !charging_disabled);
	}
}

static void battery_id_valid(struct work_struct *work)
{
	struct pm8921_chg_chip *chip = container_of(work,
				struct pm8921_chg_chip, battery_id_valid_work);

	check_battery_valid(chip);
}

static void pm8921_chg_enable_irq(struct pm8921_chg_chip *chip, int interrupt)
{
	if (!__test_and_set_bit(interrupt, chip->enabled_irqs)) {
		dev_dbg(chip->dev, "%d\n", chip->pmic_chg_irq[interrupt]);
		enable_irq(chip->pmic_chg_irq[interrupt]);
	}
}

static void pm8921_chg_disable_irq(struct pm8921_chg_chip *chip, int interrupt)
{
	if (__test_and_clear_bit(interrupt, chip->enabled_irqs)) {
		dev_dbg(chip->dev, "%d\n", chip->pmic_chg_irq[interrupt]);
		disable_irq_nosync(chip->pmic_chg_irq[interrupt]);
	}
}

static int pm_chg_get_rt_status(struct pm8921_chg_chip *chip, int irq_id)
{
	return pm8xxx_read_irq_stat(chip->dev->parent,
					chip->pmic_chg_irq[irq_id]);
}

/* Treat OverVoltage/UnderVoltage as source missing */
static int is_usb_chg_plugged_in(struct pm8921_chg_chip *chip)
{
	int pres, ov, uv;

	pres = pm_chg_get_rt_status(chip, USBIN_VALID_IRQ);
	ov = pm_chg_get_rt_status(chip, USBIN_OV_IRQ);
	uv = pm_chg_get_rt_status(chip, USBIN_UV_IRQ);

	return pres && !ov && !uv;
}

/* Treat OverVoltage/UnderVoltage as source missing */
static int is_dc_chg_plugged_in(struct pm8921_chg_chip *chip)
{
	int pres, ov, uv;

	pres = pm_chg_get_rt_status(chip, DCIN_VALID_IRQ);
	ov = pm_chg_get_rt_status(chip, DCIN_OV_IRQ);
	uv = pm_chg_get_rt_status(chip, DCIN_UV_IRQ);

	return pres && !ov && !uv;
}

static int is_battery_charging(int fsm_state)
{
	switch (fsm_state) {
	case FSM_STATE_ATC_2A:
	case FSM_STATE_ATC_2B:
	case FSM_STATE_ON_CHG_AND_BAT_6:
	case FSM_STATE_FAST_CHG_7:
	case FSM_STATE_TRKL_CHG_8:
		return 1;
	}
	return 0;
}

static void bms_notify(struct work_struct *work)
{
	struct bms_notify *n = container_of(work, struct bms_notify, work);

	if (n->is_charging)
		pm8921_bms_charging_began();
	else
		pm8921_bms_charging_end();
}

static enum power_supply_property pm_power_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
};

static char *pm_power_supplied_to[] = {
	"battery",
};

static int pm_power_get_property(struct power_supply *psy,
				  enum power_supply_property psp,
				  union power_supply_propval *val)
{
	struct pm8921_chg_chip *chip;

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
	case POWER_SUPPLY_PROP_ONLINE:
		if (psy->type == POWER_SUPPLY_TYPE_MAINS) {
			chip = container_of(psy, struct pm8921_chg_chip,
							dc_psy);
			val->intval = is_dc_chg_plugged_in(chip);
		}
		if (psy->type == POWER_SUPPLY_TYPE_USB) {
			chip = container_of(psy, struct pm8921_chg_chip,
							usb_psy);
			val->intval = is_usb_chg_plugged_in(chip);
		}
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property msm_batt_power_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_TEMP,
};

static int get_prop_battery_mvolts(struct pm8921_chg_chip *chip)
{
	int rc;
	struct pm8921_adc_chan_result result;

	rc = pm8921_adc_read(chip->vbat_channel, &result);
	if (rc) {
		pr_err("error reading adc channel = %d, rc = %d\n",
					chip->vbat_channel, rc);
		return rc;
	}
	pr_debug("mvolts phy = %lld meas = 0x%llx\n", result.physical,
						result.measurement);
	return (int)result.physical;
}

static int get_prop_batt_capacity(struct pm8921_chg_chip *chip)
{
	int percent_soc = pm8921_bms_get_percent_charge();

	if (percent_soc <= 10)
		pr_warn("low battery charge = %d%%\n", percent_soc);

	return percent_soc;
}

static int get_prop_batt_current(struct pm8921_chg_chip *chip)
{
	int result_ma, rc;

	rc = pm8921_bms_get_battery_current(&result_ma);
	if (rc) {
		pr_err("unable to get batt current rc = %d\n", rc);
		return rc;
	} else {
		return result_ma;
	}
}

static int get_prop_batt_health(struct pm8921_chg_chip *chip)
{
	int temp;

	temp = pm_chg_get_rt_status(chip, BATTTEMP_HOT_IRQ);
	if (temp)
		return POWER_SUPPLY_HEALTH_OVERHEAT;

	temp = pm_chg_get_rt_status(chip, BATTTEMP_COLD_IRQ);
	if (temp)
		return POWER_SUPPLY_HEALTH_COLD;

	return POWER_SUPPLY_HEALTH_GOOD;
}

static int get_prop_batt_present(struct pm8921_chg_chip *chip)
{
	return pm_chg_get_rt_status(chip, BATT_INSERTED_IRQ);
}

static int get_prop_charge_type(struct pm8921_chg_chip *chip)
{
	int temp;

	temp = pm_chg_get_rt_status(chip, TRKLCHG_IRQ);
	if (temp)
		return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;

	temp = pm_chg_get_rt_status(chip, FASTCHG_IRQ);
	if (temp)
		return POWER_SUPPLY_CHARGE_TYPE_FAST;

	return POWER_SUPPLY_CHARGE_TYPE_NONE;
}

static int get_prop_batt_status(struct pm8921_chg_chip *chip)
{
	int temp = 0;

	/* TODO reading the FSM state is more reliable */
	temp = pm_chg_get_rt_status(chip, TRKLCHG_IRQ);

	temp |= pm_chg_get_rt_status(chip, FASTCHG_IRQ);
	if (temp)
		return POWER_SUPPLY_STATUS_CHARGING;
	/*
	 * The battery is not charging
	 * check the FET - if on battery is discharging
	 *		 - if off battery is isolated(full) and the system
	 *		   is being driven from a charger
	 */
	temp = pm_chg_get_rt_status(chip, BATFET_IRQ);
	if (temp)
		return POWER_SUPPLY_STATUS_DISCHARGING;

	return POWER_SUPPLY_STATUS_FULL;
}

static int get_prop_batt_temp(struct pm8921_chg_chip *chip)
{
	int rc;
	struct pm8921_adc_chan_result result;

	rc = pm8921_adc_read(chip->batt_temp_channel, &result);
	if (rc) {
		pr_err("error reading adc channel = %d, rc = %d\n",
					chip->vbat_channel, rc);
		return rc;
	}
	pr_debug("batt_temp phy = %lld meas = 0x%llx\n", result.physical,
						result.measurement);
	return (int)result.physical;
}

static int pm_batt_power_get_property(struct power_supply *psy,
				       enum power_supply_property psp,
				       union power_supply_propval *val)
{
	struct pm8921_chg_chip *chip = container_of(psy, struct pm8921_chg_chip,
								batt_psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = get_prop_batt_status(chip);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		val->intval = get_prop_charge_type(chip);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		val->intval = get_prop_batt_health(chip);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = get_prop_batt_present(chip);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = chip->max_voltage;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = chip->min_voltage;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = get_prop_battery_mvolts(chip);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = get_prop_batt_capacity(chip);
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = get_prop_batt_current(chip);
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = get_prop_batt_temp(chip);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static void (*notify_vbus_state_func_ptr)(int);
static int usb_chg_current;
static DEFINE_SPINLOCK(vbus_lock);

int pm8921_charger_register_vbus_sn(void (*callback)(int))
{
	pr_debug("%p\n", callback);
	notify_vbus_state_func_ptr = callback;
	return 0;
}
EXPORT_SYMBOL_GPL(pm8921_charger_register_vbus_sn);

/* this is passed to the hsusb via platform_data msm_otg_pdata */
void pm8921_charger_unregister_vbus_sn(void (*callback)(int))
{
	pr_debug("%p\n", callback);
	notify_vbus_state_func_ptr = NULL;
}
EXPORT_SYMBOL_GPL(pm8921_charger_unregister_vbus_sn);

static void notify_usb_of_the_plugin_event(int plugin)
{
	plugin = !!plugin;
	if (notify_vbus_state_func_ptr) {
		pr_debug("notifying plugin\n");
		(*notify_vbus_state_func_ptr) (plugin);
	} else {
		pr_debug("unable to notify plugin\n");
	}
}

struct usb_ma_limit_entry {
	int usb_ma;
	u8  chg_iusb_value;
};

static struct usb_ma_limit_entry usb_ma_table[] = {
	{100, 0},
	{500, 1},
	{700, 2},
	{850, 3},
	{900, 4},
	{1100, 5},
	{1300, 6},
	{1500, 7},
};

/* assumes vbus_lock is held */
static void __pm8921_charger_vbus_draw(unsigned int mA)
{
	int i, rc;

	if (mA > 0 && mA <= 2) {
		usb_chg_current = 0;
		rc = pm_chg_iusbmax_set(the_chip,
				usb_ma_table[0].chg_iusb_value);
		if (rc) {
			pr_err("unable to set iusb to %d rc = %d\n",
				usb_ma_table[0].chg_iusb_value, rc);
		}
		rc = pm_chg_usb_suspend_enable(the_chip, 1);
		if (rc)
			pr_err("fail to set suspend bit rc=%d\n", rc);
	} else {
		rc = pm_chg_usb_suspend_enable(the_chip, 0);
		if (rc)
			pr_err("fail to reset suspend bit rc=%d\n", rc);
		for (i = ARRAY_SIZE(usb_ma_table) - 1; i >= 0; i--) {
			if (usb_ma_table[i].usb_ma <= mA)
				break;
		}
		if (i < 0)
			i = 0;
		rc = pm_chg_iusbmax_set(the_chip,
				usb_ma_table[i].chg_iusb_value);
		if (rc) {
			pr_err("unable to set iusb to %d rc = %d\n",
				usb_ma_table[i].chg_iusb_value, rc);
		}
	}
}

/* USB calls these to tell us how much max usb current the system can draw */
void pm8921_charger_vbus_draw(unsigned int mA)
{
	unsigned long flags;

	pr_debug("Enter charge=%d\n", mA);
	spin_lock_irqsave(&vbus_lock, flags);
	if (the_chip) {
		__pm8921_charger_vbus_draw(mA);
	} else {
		/*
		 * called before pmic initialized,
		 * save this value and use it at probe
		 */
		usb_chg_current = mA;
	}
	spin_unlock_irqrestore(&vbus_lock, flags);
}
EXPORT_SYMBOL_GPL(pm8921_charger_vbus_draw);

int pm8921_charger_enable(bool enable)
{
	int rc;

	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	enable = !!enable;
	rc = pm_chg_auto_enable(the_chip, enable);
	if (rc)
		pr_err("Failed rc=%d\n", rc);
	return rc;
}
EXPORT_SYMBOL(pm8921_charger_enable);

int pm8921_is_usb_chg_plugged_in(void)
{
	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	return is_usb_chg_plugged_in(the_chip);
}
EXPORT_SYMBOL(pm8921_is_usb_chg_plugged_in);

int pm8921_is_dc_chg_plugged_in(void)
{
	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	return is_dc_chg_plugged_in(the_chip);
}
EXPORT_SYMBOL(pm8921_is_dc_chg_plugged_in);

int pm8921_is_battery_present(void)
{
	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	return get_prop_batt_present(the_chip);
}
EXPORT_SYMBOL(pm8921_is_battery_present);

int pm8921_set_max_battery_charge_current(int ma)
{
	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	return pm_chg_ibatmax_set(the_chip, ma);
}
EXPORT_SYMBOL(pm8921_set_max_battery_charge_current);

int pm8921_disable_source_current(bool disable)
{
	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	if (disable)
		pr_warn("current drawn from chg=0, battery provides current\n");
	return pm_chg_charge_dis(the_chip, disable);
}
EXPORT_SYMBOL(pm8921_disable_source_current);

bool pm8921_is_battery_charging(int *source)
{
	int fsm_state, is_charging, dc_present, usb_present;

	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	fsm_state = pm_chg_get_fsm_state(the_chip);
	is_charging = is_battery_charging(fsm_state);
	if (is_charging == 0) {
		*source = PM8921_CHG_SRC_NONE;
		return is_charging;
	}

	if (source == NULL)
		return is_charging;

	/* the battery is charging, the source is requested, find it */
	dc_present = is_dc_chg_plugged_in(the_chip);
	usb_present = is_usb_chg_plugged_in(the_chip);

	if (dc_present && !usb_present)
		*source = PM8921_CHG_SRC_DC;

	if (usb_present && !dc_present)
		*source = PM8921_CHG_SRC_USB;

	if (usb_present && dc_present)
		/*
		 * The system always chooses dc for charging since it has
		 * higher priority.
		 */
		*source = PM8921_CHG_SRC_DC;

	return is_charging;
}
EXPORT_SYMBOL(pm8921_is_battery_charging);

int pm8921_batt_temperature(void)
{
	if (!the_chip) {
		pr_err("called before init\n");
		return -EINVAL;
	}
	return get_prop_batt_temp(the_chip);
}

static void handle_usb_insertion_removal(struct pm8921_chg_chip *chip)
{
	int usb_present;

	usb_present = is_usb_chg_plugged_in(chip);
	if (chip->usb_present ^ usb_present) {
		notify_usb_of_the_plugin_event(usb_present);
		chip->usb_present = usb_present;
		power_supply_changed(&chip->usb_psy);
	}
}

static void handle_dc_removal_insertion(struct pm8921_chg_chip *chip)
{
	int dc_present;

	dc_present = is_dc_chg_plugged_in(chip);
	if (chip->dc_present ^ dc_present) {
		chip->dc_present = dc_present;
		power_supply_changed(&chip->dc_psy);
	}
}

static irqreturn_t usbin_valid_irq_handler(int irq, void *data)
{
	handle_usb_insertion_removal(data);
	return IRQ_HANDLED;
}

static irqreturn_t usbin_ov_irq_handler(int irq, void *data)
{
	pr_err("USB OverVoltage\n");
	handle_usb_insertion_removal(data);
	return IRQ_HANDLED;
}

static irqreturn_t batt_inserted_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;
	int status;

	status = pm_chg_get_rt_status(chip, BATT_INSERTED_IRQ);
	schedule_work(&chip->battery_id_valid_work);
	pr_debug("battery present=%d", status);
	power_supply_changed(&chip->batt_psy);
	return IRQ_HANDLED;
}
/* this interrupt used to restart charging a battery */
static irqreturn_t vbatdet_low_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t usbin_uv_irq_handler(int irq, void *data)
{
	pr_err("USB UnderVoltage\n");
	handle_usb_insertion_removal(data);
	return IRQ_HANDLED;
}

static irqreturn_t vbat_ov_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t chgwdog_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t vcp_irq_handler(int irq, void *data)
{
	pr_warning("VCP triggered BATDET forced on\n");
	pr_debug("state_changed_to=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t atcdone_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t atcfail_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t chgdone_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("state_changed_to=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t chgfail_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("state_changed_to=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t chgstate_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;
	int new_is_charging = 0, fsm_state;

	pr_debug("state_changed_to=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);

	fsm_state = pm_chg_get_fsm_state(chip);
	new_is_charging = is_battery_charging(fsm_state);

	if (chip->bms_notify.is_charging ^ new_is_charging) {
		chip->bms_notify.is_charging = new_is_charging;
		schedule_work(&(chip->bms_notify.work));
	}
	return IRQ_HANDLED;
}

static irqreturn_t loop_change_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t fastchg_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	power_supply_changed(&chip->batt_psy);
	return IRQ_HANDLED;
}

static irqreturn_t trklchg_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	power_supply_changed(&chip->batt_psy);
	return IRQ_HANDLED;
}

static irqreturn_t batt_removed_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;
	int status;

	status = pm_chg_get_rt_status(chip, BATT_REMOVED_IRQ);
	pr_debug("battery present=%d state=%d", !status,
					 pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	return IRQ_HANDLED;
}

static irqreturn_t batttemp_hot_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	power_supply_changed(&chip->batt_psy);
	return IRQ_HANDLED;
}

static irqreturn_t chghot_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("Chg hot fsm_state=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t batttemp_cold_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("Batt cold fsm_state=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t chg_gone_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("Chg gone fsm_state=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t bat_temp_ok_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("batt temp ok fsm_state=%d\n", pm_chg_get_fsm_state(data));
	power_supply_changed(&chip->batt_psy);
	power_supply_changed(&chip->usb_psy);
	power_supply_changed(&chip->dc_psy);
	return IRQ_HANDLED;
}

static irqreturn_t coarse_det_low_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t vdd_loop_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t vreg_ov_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t vbatdet_irq_handler(int irq, void *data)
{
	pr_debug("fsm_state=%d\n", pm_chg_get_fsm_state(data));
	return IRQ_HANDLED;
}

static irqreturn_t batfet_irq_handler(int irq, void *data)
{
	struct pm8921_chg_chip *chip = data;

	pr_debug("vreg ov\n");
	power_supply_changed(&chip->batt_psy);
	return IRQ_HANDLED;
}

static irqreturn_t dcin_valid_irq_handler(int irq, void *data)
{
	handle_dc_removal_insertion(data);
	return IRQ_HANDLED;
}

static irqreturn_t dcin_ov_irq_handler(int irq, void *data)
{
	handle_dc_removal_insertion(data);
	return IRQ_HANDLED;
}

static irqreturn_t dcin_uv_irq_handler(int irq, void *data)
{
	handle_dc_removal_insertion(data);
	return IRQ_HANDLED;
}

static void btm_configure_work(struct work_struct *work)
{
	int rc;

	rc = pm8921_adc_btm_configure(&btm_config);
	if (rc)
		pr_err("failed to configure btm rc=%d", rc);
}

DECLARE_WORK(btm_config_work, btm_configure_work);

#define TEMP_HYSTERISIS_DEGC 2
static void battery_cool(bool enter)
{
	pr_debug("enter = %d\n", enter);
	if (enter) {
		btm_config.low_thr_temp =
			the_chip->cool_temp + TEMP_HYSTERISIS_DEGC;
		pm_chg_ibatmax_set(the_chip, the_chip->cool_bat_chg_current);
		pm_chg_vddmax_set(the_chip, the_chip->cool_bat_voltage);
	} else {
		btm_config.low_thr_temp = the_chip->cool_temp;
		pm_chg_ibatmax_set(the_chip, the_chip->max_bat_chg_current);
		pm_chg_vddmax_set(the_chip, the_chip->max_voltage);
	}
	schedule_work(&btm_config_work);
}

static void battery_warm(bool enter)
{
	pr_debug("enter = %d\n", enter);
	if (enter) {
		btm_config.high_thr_temp =
			the_chip->warm_temp - TEMP_HYSTERISIS_DEGC;
		pm_chg_ibatmax_set(the_chip, the_chip->warm_bat_chg_current);
		pm_chg_vddmax_set(the_chip, the_chip->warm_bat_voltage);
	} else {
		btm_config.high_thr_temp = the_chip->warm_temp;
		pm_chg_ibatmax_set(the_chip, the_chip->max_bat_chg_current);
		pm_chg_vddmax_set(the_chip, the_chip->max_voltage);
	}
	schedule_work(&btm_config_work);
}

static int configure_btm(struct pm8921_chg_chip *chip)
{
	int rc;

	btm_config.btm_warm_fn = battery_warm;
	btm_config.btm_cool_fn = battery_cool;
	btm_config.low_thr_temp = chip->cool_temp;
	btm_config.high_thr_temp = chip->warm_temp;
	btm_config.interval = chip->temp_check_period;
	rc = pm8921_adc_btm_configure(&btm_config);
	if (rc)
		pr_err("failed to configure btm rc = %d\n", rc);
	rc = pm8921_adc_btm_start();
	if (rc)
		pr_err("failed to start btm rc = %d\n", rc);

	return rc;
}

/**
 * set_disable_status_param -
 *
 * Internal function to disable battery charging and also disable drawing
 * any current from the source. The device is forced to run on a battery
 * after this.
 */
static int set_disable_status_param(const char *val, struct kernel_param *kp)
{
	int ret;
	struct pm8921_chg_chip *chip = the_chip;

	ret = param_set_int(val, kp);
	if (ret) {
		pr_err("error setting value %d\n", ret);
		return ret;
	}
	pr_info("factory set disable param to %d\n", charging_disabled);
	if (chip) {
		pm_chg_auto_enable(chip, !charging_disabled);
		pm_chg_charge_dis(chip, charging_disabled);
	}
	return 0;
}
module_param_call(disabled, set_disable_status_param, param_get_uint,
					&charging_disabled, 0644);

static void free_irqs(struct pm8921_chg_chip *chip)
{
	int i;

	for (i = 0; i < PM_CHG_MAX_INTS; i++)
		if (chip->pmic_chg_irq[i]) {
			free_irq(chip->pmic_chg_irq[i], chip);
			chip->pmic_chg_irq[i] = 0;
		}
}

/* determines the initial present states and notifies msm_charger */
static void __devinit determine_initial_state(struct pm8921_chg_chip *chip)
{
	unsigned long flags;
	int fsm_state;

	chip->dc_present = !!is_dc_chg_plugged_in(chip);
	chip->usb_present = !!is_usb_chg_plugged_in(chip);

	notify_usb_of_the_plugin_event(chip->usb_present);

	pm8921_chg_enable_irq(chip, DCIN_VALID_IRQ);
	pm8921_chg_enable_irq(chip, USBIN_VALID_IRQ);
	pm8921_chg_enable_irq(chip, BATT_REMOVED_IRQ);
	pm8921_chg_enable_irq(chip, BATT_INSERTED_IRQ);
	pm8921_chg_enable_irq(chip, USBIN_OV_IRQ);
	pm8921_chg_enable_irq(chip, USBIN_UV_IRQ);
	pm8921_chg_enable_irq(chip, DCIN_OV_IRQ);
	pm8921_chg_enable_irq(chip, DCIN_UV_IRQ);
	pm8921_chg_enable_irq(chip, CHGSTATE_IRQ);

	spin_lock_irqsave(&vbus_lock, flags);
	if (usb_chg_current) {
		/* reissue a vbus draw call */
		__pm8921_charger_vbus_draw(usb_chg_current);
	}
	spin_unlock_irqrestore(&vbus_lock, flags);

	fsm_state = pm_chg_get_fsm_state(chip);
	if (is_battery_charging(fsm_state)) {
		chip->bms_notify.is_charging = 1;
		pm8921_bms_charging_began();
	}

	check_battery_valid(chip);

	pr_debug("usb = %d, dc = %d  batt = %d state=%d\n",
			chip->usb_present,
			chip->dc_present,
			get_prop_batt_present(chip),
			fsm_state);
}

struct pm_chg_irq_init_data {
	unsigned int	irq_id;
	char		*name;
	unsigned long	flags;
	irqreturn_t	(*handler)(int, void *);
};

#define CHG_IRQ(_id, _flags, _handler) \
{ \
	.irq_id		= _id, \
	.name		= #_id, \
	.flags		= _flags, \
	.handler	= _handler, \
}
struct pm_chg_irq_init_data chg_irq_data[] = {
	CHG_IRQ(USBIN_VALID_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						usbin_valid_irq_handler),
	CHG_IRQ(USBIN_OV_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						usbin_ov_irq_handler),
	CHG_IRQ(BATT_INSERTED_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						batt_inserted_irq_handler),
	CHG_IRQ(VBATDET_LOW_IRQ, IRQF_TRIGGER_RISING, vbatdet_low_irq_handler),
	CHG_IRQ(USBIN_UV_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
							usbin_uv_irq_handler),
	CHG_IRQ(VBAT_OV_IRQ, IRQF_TRIGGER_RISING, vbat_ov_irq_handler),
	CHG_IRQ(CHGWDOG_IRQ, IRQF_TRIGGER_RISING, chgwdog_irq_handler),
	CHG_IRQ(VCP_IRQ, IRQF_TRIGGER_RISING, vcp_irq_handler),
	CHG_IRQ(ATCDONE_IRQ, IRQF_TRIGGER_RISING, atcdone_irq_handler),
	CHG_IRQ(ATCFAIL_IRQ, IRQF_TRIGGER_RISING, atcfail_irq_handler),
	CHG_IRQ(CHGDONE_IRQ, IRQF_TRIGGER_RISING, chgdone_irq_handler),
	CHG_IRQ(CHGFAIL_IRQ, IRQF_TRIGGER_RISING, chgfail_irq_handler),
	CHG_IRQ(CHGSTATE_IRQ, IRQF_TRIGGER_RISING, chgstate_irq_handler),
	CHG_IRQ(LOOP_CHANGE_IRQ, IRQF_TRIGGER_RISING, loop_change_irq_handler),
	CHG_IRQ(FASTCHG_IRQ, IRQF_TRIGGER_RISING, fastchg_irq_handler),
	CHG_IRQ(TRKLCHG_IRQ, IRQF_TRIGGER_RISING, trklchg_irq_handler),
	CHG_IRQ(BATT_REMOVED_IRQ, IRQF_TRIGGER_RISING,
						batt_removed_irq_handler),
	CHG_IRQ(BATTTEMP_HOT_IRQ, IRQF_TRIGGER_RISING,
						batttemp_hot_irq_handler),
	CHG_IRQ(CHGHOT_IRQ, IRQF_TRIGGER_RISING, chghot_irq_handler),
	CHG_IRQ(BATTTEMP_COLD_IRQ, IRQF_TRIGGER_RISING,
						batttemp_cold_irq_handler),
	CHG_IRQ(CHG_GONE_IRQ, IRQF_TRIGGER_RISING, chg_gone_irq_handler),
	CHG_IRQ(BAT_TEMP_OK_IRQ, IRQF_TRIGGER_RISING, bat_temp_ok_irq_handler),
	CHG_IRQ(COARSE_DET_LOW_IRQ, IRQF_TRIGGER_RISING,
						coarse_det_low_irq_handler),
	CHG_IRQ(VDD_LOOP_IRQ, IRQF_TRIGGER_RISING, vdd_loop_irq_handler),
	CHG_IRQ(VREG_OV_IRQ, IRQF_TRIGGER_RISING, vreg_ov_irq_handler),
	CHG_IRQ(VBATDET_IRQ, IRQF_TRIGGER_RISING, vbatdet_irq_handler),
	CHG_IRQ(BATFET_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						batfet_irq_handler),
	CHG_IRQ(DCIN_VALID_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						dcin_valid_irq_handler),
	CHG_IRQ(DCIN_OV_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						dcin_ov_irq_handler),
	CHG_IRQ(DCIN_UV_IRQ, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
						dcin_uv_irq_handler),
};

static int __devinit request_irqs(struct pm8921_chg_chip *chip,
					struct platform_device *pdev)
{
	struct resource *res;
	int ret, i;

	ret = 0;
	bitmap_fill(chip->enabled_irqs, PM_CHG_MAX_INTS);

	for (i = 0; i < ARRAY_SIZE(chg_irq_data); i++) {
		res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
				chg_irq_data[i].name);
		if (res == NULL) {
			pr_err("couldn't find %s\n", chg_irq_data[i].name);
			goto err_out;
		}
		ret = request_irq(res->start, chg_irq_data[i].handler,
			chg_irq_data[i].flags,
			chg_irq_data[i].name, chip);
		if (ret < 0) {
			pr_err("couldn't request %d (%s) %d\n", res->start,
					chg_irq_data[i].name, ret);
			goto err_out;
		}
		chip->pmic_chg_irq[chg_irq_data[i].irq_id] = res->start;
		pm8921_chg_disable_irq(chip, chg_irq_data[i].irq_id);
	}
	return 0;

err_out:
	free_irqs(chip);
	return -EINVAL;
}

#define ENUM_TIMER_STOP_BIT	BIT(1)
#define BOOT_DONE_BIT		BIT(6)
#define CHG_BATFET_ON_BIT	BIT(3)
#define CHG_VCP_EN		BIT(0)
#define CHG_BAT_TEMP_DIS_BIT	BIT(2)
#define SAFE_CURRENT_MA		1500
static int __devinit pm8921_chg_hw_init(struct pm8921_chg_chip *chip)
{
	int rc;

	rc = pm_chg_masked_write(chip, SYS_CONFIG_2,
					BOOT_DONE_BIT, BOOT_DONE_BIT);
	if (rc) {
		pr_err("Failed to set BOOT_DONE_BIT rc=%d\n", rc);
		return rc;
	}

	rc = pm_chg_vddsafe_set(chip, chip->max_voltage);
	if (rc) {
		pr_err("Failed to set safe voltage to %d rc=%d\n",
						chip->max_voltage, rc);
		return rc;
	}
	rc = pm_chg_vbatdet_set(chip, chip->resume_voltage);
	if (rc) {
		pr_err("Failed to set vbatdet comprator voltage to %d rc=%d\n",
						chip->resume_voltage, rc);
		return rc;
	}

	rc = pm_chg_vddmax_set(chip, chip->max_voltage);
	if (rc) {
		pr_err("Failed to set max voltage to %d rc=%d\n",
						chip->max_voltage, rc);
		return rc;
	}
	rc = pm_chg_ibatsafe_set(chip, SAFE_CURRENT_MA);
	if (rc) {
		pr_err("Failed to set max voltage to %d rc=%d\n",
						SAFE_CURRENT_MA, rc);
		return rc;
	}

	/* TODO needs to be changed as per the temeperature of the battery */
	rc = pm_chg_ibatmax_set(chip, chip->max_bat_chg_current);
	if (rc) {
		pr_err("Failed to set max current to 400 rc=%d\n", rc);
		return rc;
	}

	rc = pm_chg_iterm_set(chip, chip->term_current);
	if (rc) {
		pr_err("Failed to set term current to %d rc=%d\n",
						chip->term_current, rc);
		return rc;
	}

	/* Disable the ENUM TIMER */
	rc = pm_chg_masked_write(chip, PBL_ACCESS2, ENUM_TIMER_STOP_BIT,
			ENUM_TIMER_STOP_BIT);
	if (rc) {
		pr_err("Failed to set enum timer stop rc=%d\n", rc);
		return rc;
	}

	/* init with the lowest USB current */
	rc = pm_chg_iusbmax_set(chip, usb_ma_table[0].chg_iusb_value);
	if (rc) {
		pr_err("Failed to set usb max to %d rc=%d\n",
					usb_ma_table[0].chg_iusb_value, rc);
		return rc;
	}

	if (chip->safety_time != 0) {
		rc = pm_chg_tchg_max_set(chip, chip->safety_time);
		if (rc) {
			pr_err("Failed to set max time to %d minutes rc=%d\n",
							chip->safety_time, rc);
			return rc;
		}
	}

	if (chip->ttrkl_time != 0) {
		rc = pm_chg_ttrkl_max_set(chip, chip->safety_time);
		if (rc) {
			pr_err("Failed to set trkl time to %d minutes rc=%d\n",
							chip->safety_time, rc);
			return rc;
		}
	}

	rc = pm_chg_disable_wd(chip);
	if (rc) {
		pr_err("Failed to disable wd rc=%d\n", rc);
		return rc;
	}

	rc = pm_chg_masked_write(chip, CHG_CNTRL_2,
				CHG_BAT_TEMP_DIS_BIT, 0);
	if (rc) {
		pr_err("Failed to enable temp control chg rc=%d\n", rc);
		return rc;
	}
	/* switch to a 3.2Mhz for the buck */
	rc = pm8xxx_writeb(chip->dev->parent, CHG_BUCK_CLOCK_CTRL, 0x15);
	if (rc) {
		pr_err("Failed to switch buck clk rc=%d\n", rc);
		return rc;
	}

	/* Workarounds for die 1.1 and 1.0 */
	if (pm8xxx_get_revision(chip->dev->parent) < PM8XXX_REVISION_8921_2p0) {
		pm8xxx_writeb(chip->dev->parent, CHG_BUCK_CTRL_TEST2, 0xF1);
		pm8xxx_writeb(chip->dev->parent, CHG_BUCK_CTRL_TEST3, 0x8C);
		pm8xxx_writeb(chip->dev->parent, CHG_BUCK_CTRL_TEST3, 0xCE);
		pm8xxx_writeb(chip->dev->parent, CHG_BUCK_CTRL_TEST3, 0xD8);
		pm8xxx_writeb(chip->dev->parent, CHG_BUCK_CTRL_TEST3, 0xF1);

		/* software workaround for correct battery_id detection */
		pm8xxx_writeb(chip->dev->parent, PSI_TXRX_SAMPLE_DATA_0, 0xFF);
		pm8xxx_writeb(chip->dev->parent, PSI_TXRX_SAMPLE_DATA_1, 0xFF);
		pm8xxx_writeb(chip->dev->parent, PSI_TXRX_SAMPLE_DATA_2, 0xFF);
		pm8xxx_writeb(chip->dev->parent, PSI_TXRX_SAMPLE_DATA_3, 0xFF);
		pm8xxx_writeb(chip->dev->parent, PSI_CONFIG_STATUS, 0x0D);
		udelay(100);
		pm8xxx_writeb(chip->dev->parent, PSI_CONFIG_STATUS, 0x0C);
	}

	rc = pm_chg_charge_dis(chip, charging_disabled);
	if (rc) {
		pr_err("Failed to disable CHG_CHARGE_DIS bit rc=%d\n", rc);
		return rc;
	}

	rc = pm_chg_auto_enable(chip, !charging_disabled);
	if (rc) {
		pr_err("Failed to enable charging rc=%d\n", rc);
		return rc;
	}

	return 0;
}

static int get_rt_status(void *data, u64 * val)
{
	int i = (int)data;
	int ret;

	/* global irq number is passed in via data */
	ret = pm_chg_get_rt_status(the_chip, i);
	*val = ret;
	return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(rt_fops, get_rt_status, NULL, "%llu\n");

static int get_fsm_status(void *data, u64 * val)
{
	u8 temp;

	temp = pm_chg_get_fsm_state(the_chip);
	*val = temp;
	return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(fsm_fops, get_fsm_status, NULL, "%llu\n");

static int get_reg(void *data, u64 * val)
{
	int addr = (int)data;
	int ret;
	u8 temp;

	ret = pm8xxx_readb(the_chip->dev->parent, addr, &temp);
	if (ret) {
		pr_err("pm8xxx_readb to %x value =%d errored = %d\n",
			addr, temp, ret);
		return -EAGAIN;
	}
	*val = temp;
	return 0;
}

static int set_reg(void *data, u64 val)
{
	int addr = (int)data;
	int ret;
	u8 temp;

	temp = (u8) val;
	ret = pm8xxx_writeb(the_chip->dev->parent, addr, temp);
	if (ret) {
		pr_err("pm8xxx_writeb to %x value =%d errored = %d\n",
			addr, temp, ret);
		return -EAGAIN;
	}
	return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(reg_fops, get_reg, set_reg, "0x%02llx\n");

static void create_debugfs_entries(struct pm8921_chg_chip *chip)
{
	int i;

	chip->dent = debugfs_create_dir("pm8921_chg", NULL);

	if (IS_ERR(chip->dent)) {
		pr_err("pmic charger couldnt create debugfs dir\n");
		return;
	}

	debugfs_create_file("CHG_CNTRL", 0644, chip->dent,
			    (void *)CHG_CNTRL, &reg_fops);
	debugfs_create_file("CHG_CNTRL_2", 0644, chip->dent,
			    (void *)CHG_CNTRL_2, &reg_fops);
	debugfs_create_file("CHG_CNTRL_3", 0644, chip->dent,
			    (void *)CHG_CNTRL_3, &reg_fops);
	debugfs_create_file("PBL_ACCESS1", 0644, chip->dent,
			    (void *)PBL_ACCESS1, &reg_fops);
	debugfs_create_file("PBL_ACCESS2", 0644, chip->dent,
			    (void *)PBL_ACCESS2, &reg_fops);
	debugfs_create_file("SYS_CONFIG_1", 0644, chip->dent,
			    (void *)SYS_CONFIG_1, &reg_fops);
	debugfs_create_file("SYS_CONFIG_2", 0644, chip->dent,
			    (void *)SYS_CONFIG_2, &reg_fops);
	debugfs_create_file("CHG_VDD_MAX", 0644, chip->dent,
			    (void *)CHG_VDD_MAX, &reg_fops);
	debugfs_create_file("CHG_VDD_SAFE", 0644, chip->dent,
			    (void *)CHG_VDD_SAFE, &reg_fops);
	debugfs_create_file("CHG_VBAT_DET", 0644, chip->dent,
			    (void *)CHG_VBAT_DET, &reg_fops);
	debugfs_create_file("CHG_IBAT_MAX", 0644, chip->dent,
			    (void *)CHG_IBAT_MAX, &reg_fops);
	debugfs_create_file("CHG_IBAT_SAFE", 0644, chip->dent,
			    (void *)CHG_IBAT_SAFE, &reg_fops);
	debugfs_create_file("CHG_VIN_MIN", 0644, chip->dent,
			    (void *)CHG_VIN_MIN, &reg_fops);
	debugfs_create_file("CHG_VTRICKLE", 0644, chip->dent,
			    (void *)CHG_VTRICKLE, &reg_fops);
	debugfs_create_file("CHG_ITRICKLE", 0644, chip->dent,
			    (void *)CHG_ITRICKLE, &reg_fops);
	debugfs_create_file("CHG_ITERM", 0644, chip->dent,
			    (void *)CHG_ITERM, &reg_fops);
	debugfs_create_file("CHG_TCHG_MAX", 0644, chip->dent,
			    (void *)CHG_TCHG_MAX, &reg_fops);
	debugfs_create_file("CHG_TWDOG", 0644, chip->dent,
			    (void *)CHG_TWDOG, &reg_fops);
	debugfs_create_file("CHG_TEMP_THRESH", 0644, chip->dent,
			    (void *)CHG_TEMP_THRESH, &reg_fops);
	debugfs_create_file("CHG_COMP_OVR", 0644, chip->dent,
			    (void *)CHG_COMP_OVR, &reg_fops);
	debugfs_create_file("CHG_BUCK_CTRL_TEST1", 0644, chip->dent,
			    (void *)CHG_BUCK_CTRL_TEST1, &reg_fops);
	debugfs_create_file("CHG_BUCK_CTRL_TEST2", 0644, chip->dent,
			    (void *)CHG_BUCK_CTRL_TEST2, &reg_fops);
	debugfs_create_file("CHG_BUCK_CTRL_TEST3", 0644, chip->dent,
			    (void *)CHG_BUCK_CTRL_TEST3, &reg_fops);
	debugfs_create_file("CHG_TEST", 0644, chip->dent,
			    (void *)CHG_TEST, &reg_fops);

	debugfs_create_file("FSM_STATE", 0644, chip->dent, NULL,
			    &fsm_fops);

	for (i = 0; i < ARRAY_SIZE(chg_irq_data); i++) {
		if (chip->pmic_chg_irq[chg_irq_data[i].irq_id])
			debugfs_create_file(chg_irq_data[i].name, 0444,
				chip->dent,
				(void *)chg_irq_data[i].irq_id,
				&rt_fops);
	}
}

static int __devinit pm8921_charger_probe(struct platform_device *pdev)
{
	int rc = 0;
	struct pm8921_chg_chip *chip;
	const struct pm8921_charger_platform_data *pdata
				= pdev->dev.platform_data;

	if (!pdata) {
		pr_err("missing platform data\n");
		return -EINVAL;
	}

	chip = kzalloc(sizeof(struct pm8921_chg_chip),
					GFP_KERNEL);
	if (!chip) {
		pr_err("Cannot allocate pm_chg_chip\n");
		return -ENOMEM;
	}

	chip->dev = &pdev->dev;
	chip->safety_time = pdata->safety_time;
	chip->ttrkl_time = pdata->ttrkl_time;
	chip->update_time = pdata->update_time;
	chip->max_voltage = pdata->max_voltage;
	chip->min_voltage = pdata->min_voltage;
	chip->resume_voltage = pdata->resume_voltage;
	chip->term_current = pdata->term_current;
	chip->vbat_channel = pdata->charger_cdata.vbat_channel;
	chip->batt_temp_channel = pdata->charger_cdata.batt_temp_channel;
	chip->batt_id_channel = pdata->charger_cdata.batt_id_channel;
	chip->batt_id_min = pdata->batt_id_min;
	chip->batt_id_max = pdata->batt_id_max;
	chip->cool_temp = pdata->cool_temp;
	chip->warm_temp = pdata->warm_temp;
	chip->temp_check_period = pdata->temp_check_period;
	chip->max_bat_chg_current = pdata->max_bat_chg_current;
	chip->cool_bat_chg_current = pdata->cool_bat_chg_current;
	chip->warm_bat_chg_current = pdata->warm_bat_chg_current;
	chip->cool_bat_voltage = pdata->cool_bat_voltage;
	chip->warm_bat_voltage = pdata->warm_bat_voltage;

	rc = pm8921_chg_hw_init(chip);
	if (rc) {
		pr_err("couldn't init hardware rc=%d\n", rc);
		goto free_chip;
	}

	chip->usb_psy.name = "usb",
	chip->usb_psy.type = POWER_SUPPLY_TYPE_USB,
	chip->usb_psy.supplied_to = pm_power_supplied_to,
	chip->usb_psy.num_supplicants = ARRAY_SIZE(pm_power_supplied_to),
	chip->usb_psy.properties = pm_power_props,
	chip->usb_psy.num_properties = ARRAY_SIZE(pm_power_props),
	chip->usb_psy.get_property = pm_power_get_property,

	chip->dc_psy.name = "ac",
	chip->dc_psy.type = POWER_SUPPLY_TYPE_MAINS,
	chip->dc_psy.supplied_to = pm_power_supplied_to,
	chip->dc_psy.num_supplicants = ARRAY_SIZE(pm_power_supplied_to),
	chip->dc_psy.properties = pm_power_props,
	chip->dc_psy.num_properties = ARRAY_SIZE(pm_power_props),
	chip->dc_psy.get_property = pm_power_get_property,

	chip->batt_psy.name = "battery",
	chip->batt_psy.type = POWER_SUPPLY_TYPE_BATTERY,
	chip->batt_psy.properties = msm_batt_power_props,
	chip->batt_psy.num_properties = ARRAY_SIZE(msm_batt_power_props),
	chip->batt_psy.get_property = pm_batt_power_get_property,

	rc = power_supply_register(chip->dev, &chip->usb_psy);
	if (rc < 0) {
		pr_err("power_supply_register usb failed rc = %d\n", rc);
		goto free_chip;
	}

	rc = power_supply_register(chip->dev, &chip->dc_psy);
	if (rc < 0) {
		pr_err("power_supply_register dc failed rc = %d\n", rc);
		goto unregister_usb;
	}

	rc = power_supply_register(chip->dev, &chip->batt_psy);
	if (rc < 0) {
		pr_err("power_supply_register batt failed rc = %d\n", rc);
		goto unregister_dc;
	}

	rc = request_irqs(chip, pdev);
	if (rc) {
		pr_err("couldn't register interrupts rc=%d\n", rc);
		goto unregister_batt;
	}

	enable_irq_wake(chip->pmic_chg_irq[USBIN_VALID_IRQ]);
	enable_irq_wake(chip->pmic_chg_irq[USBIN_OV_IRQ]);
	enable_irq_wake(chip->pmic_chg_irq[USBIN_UV_IRQ]);
	/*
	 * if both the cool_temp and warm_temp are zero the device doesnt
	 * care for jeita compliance
	 */
	if (!(chip->cool_temp == 0 && chip->warm_temp == 0)) {
		rc = configure_btm(chip);
		if (rc) {
			pr_err("couldn't register with btm rc=%d\n", rc);
			goto free_irq;
		}
	}

	platform_set_drvdata(pdev, chip);
	the_chip = chip;
	create_debugfs_entries(chip);

	INIT_WORK(&chip->bms_notify.work, bms_notify);
	INIT_WORK(&chip->battery_id_valid_work, battery_id_valid);
	/* determine what state the charger is in */
	determine_initial_state(chip);

	return 0;

free_irq:
	free_irqs(chip);
unregister_batt:
	power_supply_unregister(&chip->batt_psy);
unregister_dc:
	power_supply_unregister(&chip->dc_psy);
unregister_usb:
	power_supply_unregister(&chip->usb_psy);
free_chip:
	kfree(chip);
	return rc;
}

static int __devexit pm8921_charger_remove(struct platform_device *pdev)
{
	struct pm8921_chg_chip *chip = platform_get_drvdata(pdev);

	free_irqs(chip);
	platform_set_drvdata(pdev, NULL);
	the_chip = NULL;
	kfree(chip);
	return 0;
}

static struct platform_driver pm8921_charger_driver = {
	.probe	= pm8921_charger_probe,
	.remove	= __devexit_p(pm8921_charger_remove),
	.driver	= {
		.name	= PM8921_CHARGER_DEV_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init pm8921_charger_init(void)
{
	return platform_driver_register(&pm8921_charger_driver);
}

static void __exit pm8921_charger_exit(void)
{
	platform_driver_unregister(&pm8921_charger_driver);
}

late_initcall(pm8921_charger_init);
module_exit(pm8921_charger_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC8921 charger/battery driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:" PM8921_CHARGER_DEV_NAME);