// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
 * Copyright (c) 2023, Linaro Ltd.
 * Author: Caleb Connolly <caleb.connolly@linaro.org>
 *
 * This driver is for the switch-mode battery charger and boost
 * hardware found in pmi8998 and related PMICs.
 */

#include <linux/bits.h>
#include <linux/devm-helpers.h>
#include <linux/iio/consumer.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/of.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/workqueue.h>

/* clang-format off */
#define BATTERY_CHARGER_STATUS_1			0x06
#define BVR_INITIAL_RAMP_BIT				BIT(7)
#define CC_SOFT_TERMINATE_BIT				BIT(6)
#define STEP_CHARGING_STATUS_SHIFT			3
#define STEP_CHARGING_STATUS_MASK			GENMASK(5, 3)
#define BATTERY_CHARGER_STATUS_MASK			GENMASK(2, 0)

#define BATTERY_CHARGER_STATUS_2			0x07
#define INPUT_CURRENT_LIMITED_BIT			BIT(7)
#define CHARGER_ERROR_STATUS_SFT_EXPIRE_BIT		BIT(6)
#define CHARGER_ERROR_STATUS_BAT_OV_BIT			BIT(5)
#define CHARGER_ERROR_STATUS_BAT_TERM_MISSING_BIT	BIT(4)
#define BAT_TEMP_STATUS_MASK				GENMASK(3, 0)
#define BAT_TEMP_STATUS_SOFT_LIMIT_MASK			GENMASK(3, 2)
#define BAT_TEMP_STATUS_HOT_SOFT_LIMIT_BIT		BIT(3)
#define BAT_TEMP_STATUS_COLD_SOFT_LIMIT_BIT		BIT(2)
#define BAT_TEMP_STATUS_TOO_HOT_BIT			BIT(1)
#define BAT_TEMP_STATUS_TOO_COLD_BIT			BIT(0)

#define BATTERY_CHARGER_STATUS_4			0x0A
#define CHARGE_CURRENT_POST_JEITA_MASK			GENMASK(7, 0)

#define BATTERY_CHARGER_STATUS_7			0x0D
#define ENABLE_TRICKLE_BIT				BIT(7)
#define ENABLE_PRE_CHARGING_BIT				BIT(6)
#define ENABLE_FAST_CHARGING_BIT			BIT(5)
#define ENABLE_FULLON_MODE_BIT				BIT(4)
#define TOO_COLD_ADC_BIT				BIT(3)
#define TOO_HOT_ADC_BIT					BIT(2)
#define HOT_SL_ADC_BIT					BIT(1)
#define COLD_SL_ADC_BIT					BIT(0)

#define CHARGING_ENABLE_CMD				0x42
#define CHARGING_ENABLE_CMD_BIT				BIT(0)

#define CHGR_CFG2					0x51
#define CHG_EN_SRC_BIT					BIT(7)
#define CHG_EN_POLARITY_BIT				BIT(6)
#define PRETOFAST_TRANSITION_CFG_BIT			BIT(5)
#define BAT_OV_ECC_BIT					BIT(4)
#define I_TERM_BIT					BIT(3)
#define AUTO_RECHG_BIT					BIT(2)
#define EN_ANALOG_DROP_IN_VBATT_BIT			BIT(1)
#define CHARGER_INHIBIT_BIT				BIT(0)

#define PRE_CHARGE_CURRENT_CFG				0x60
#define PRE_CHARGE_CURRENT_SETTING_MASK			GENMASK(5, 0)

#define FAST_CHARGE_CURRENT_CFG				0x61
#define FAST_CHARGE_CURRENT_SETTING_MASK		GENMASK(7, 0)

#define FLOAT_VOLTAGE_CFG				0x70
#define FLOAT_VOLTAGE_SETTING_MASK			GENMASK(7, 0)

#define FG_UPDATE_CFG_2_SEL				0x7D
#define SOC_LT_OTG_THRESH_SEL_BIT			BIT(3)
#define SOC_LT_CHG_RECHARGE_THRESH_SEL_BIT		BIT(2)
#define VBT_LT_CHG_RECHARGE_THRESH_SEL_BIT		BIT(1)
#define IBT_LT_CHG_TERM_THRESH_SEL_BIT			BIT(0)

#define JEITA_EN_CFG					0x90
#define JEITA_EN_HARDLIMIT_BIT				BIT(4)
#define JEITA_EN_HOT_SL_FCV_BIT				BIT(3)
#define JEITA_EN_COLD_SL_FCV_BIT			BIT(2)
#define JEITA_EN_HOT_SL_CCC_BIT				BIT(1)
#define JEITA_EN_COLD_SL_CCC_BIT			BIT(0)

#define INT_RT_STS					0x310
#define TYPE_C_CHANGE_RT_STS_BIT			BIT(7)
#define USBIN_ICL_CHANGE_RT_STS_BIT			BIT(6)
#define USBIN_SOURCE_CHANGE_RT_STS_BIT			BIT(5)
#define USBIN_PLUGIN_RT_STS_BIT				BIT(4)
#define USBIN_OV_RT_STS_BIT				BIT(3)
#define USBIN_UV_RT_STS_BIT				BIT(2)
#define USBIN_LT_3P6V_RT_STS_BIT			BIT(1)
#define USBIN_COLLAPSE_RT_STS_BIT			BIT(0)

#define OTG_CFG						0x153
#define OTG_RESERVED_MASK				GENMASK(7, 6)
#define DIS_OTG_ON_TLIM_BIT				BIT(5)
#define QUICKSTART_OTG_FASTROLESWAP_BIT			BIT(4)
#define INCREASE_DFP_TIME_BIT				BIT(3)
#define ENABLE_OTG_IN_DEBUG_MODE_BIT			BIT(2)
#define OTG_EN_SRC_CFG_BIT				BIT(1)
#define CONCURRENT_MODE_CFG_BIT				BIT(0)

#define OTG_ENG_OTG_CFG					0x1C0
#define ENG_BUCKBOOST_HALT1_8_MODE_BIT			BIT(0)

#define APSD_STATUS					0x307
#define APSD_STATUS_7_BIT				BIT(7)
#define HVDCP_CHECK_TIMEOUT_BIT				BIT(6)
#define SLOW_PLUGIN_TIMEOUT_BIT				BIT(5)
#define ENUMERATION_DONE_BIT				BIT(4)
#define VADP_CHANGE_DONE_AFTER_AUTH_BIT			BIT(3)
#define QC_AUTH_DONE_STATUS_BIT				BIT(2)
#define QC_CHARGER_BIT					BIT(1)
#define APSD_DTC_STATUS_DONE_BIT			BIT(0)

#define APSD_RESULT_STATUS				0x308
#define ICL_OVERRIDE_LATCH_BIT				BIT(7)
#define APSD_RESULT_STATUS_MASK				GENMASK(6, 0)
#define QC_3P0_BIT					BIT(6)
#define QC_2P0_BIT					BIT(5)
#define FLOAT_CHARGER_BIT				BIT(4)
#define DCP_CHARGER_BIT					BIT(3)
#define CDP_CHARGER_BIT					BIT(2)
#define OCP_CHARGER_BIT					BIT(1)
#define SDP_CHARGER_BIT					BIT(0)

#define TYPE_C_STATUS_1					0x30B
#define UFP_TYPEC_MASK					GENMASK(7, 5)
#define UFP_TYPEC_RDSTD_BIT				BIT(7)
#define UFP_TYPEC_RD1P5_BIT				BIT(6)
#define UFP_TYPEC_RD3P0_BIT				BIT(5)
#define UFP_TYPEC_FMB_255K_BIT				BIT(4)
#define UFP_TYPEC_FMB_301K_BIT				BIT(3)
#define UFP_TYPEC_FMB_523K_BIT				BIT(2)
#define UFP_TYPEC_FMB_619K_BIT				BIT(1)
#define UFP_TYPEC_OPEN_OPEN_BIT				BIT(0)

#define TYPE_C_STATUS_2					0x30C
#define DFP_RA_OPEN_BIT					BIT(7)
#define TIMER_STAGE_BIT					BIT(6)
#define EXIT_UFP_MODE_BIT				BIT(5)
#define EXIT_DFP_MODE_BIT				BIT(4)
#define DFP_TYPEC_MASK					GENMASK(3, 0)
#define DFP_RD_OPEN_BIT					BIT(3)
#define DFP_RD_RA_VCONN_BIT				BIT(2)
#define DFP_RD_RD_BIT					BIT(1)
#define DFP_RA_RA_BIT					BIT(0)

#define TYPE_C_STATUS_3					0x30D
#define ENABLE_BANDGAP_BIT				BIT(7)
#define U_USB_GND_NOVBUS_BIT				BIT(6)
#define U_USB_FLOAT_NOVBUS_BIT				BIT(5)
#define U_USB_GND_BIT					BIT(4)
#define U_USB_FMB1_BIT					BIT(3)
#define U_USB_FLOAT1_BIT				BIT(2)
#define U_USB_FMB2_BIT					BIT(1)
#define U_USB_FLOAT2_BIT				BIT(0)

#define TYPE_C_STATUS_4					0x30E
#define UFP_DFP_MODE_STATUS_BIT				BIT(7)
#define TYPEC_VBUS_STATUS_BIT				BIT(6)
#define TYPEC_VBUS_ERROR_STATUS_BIT			BIT(5)
#define TYPEC_DEBOUNCE_DONE_STATUS_BIT			BIT(4)
#define TYPEC_UFP_AUDIO_ADAPT_STATUS_BIT		BIT(3)
#define TYPEC_VCONN_OVERCURR_STATUS_BIT			BIT(2)
#define CC_ORIENTATION_BIT				BIT(1)
#define CC_ATTACHED_BIT					BIT(0)

#define TYPE_C_STATUS_5					0x30F
#define TRY_SOURCE_FAILED_BIT				BIT(6)
#define TRY_SINK_FAILED_BIT				BIT(5)
#define TIMER_STAGE_2_BIT				BIT(4)
#define TYPEC_LEGACY_CABLE_STATUS_BIT			BIT(3)
#define TYPEC_NONCOMP_LEGACY_CABLE_STATUS_BIT		BIT(2)
#define TYPEC_TRYSOURCE_DETECT_STATUS_BIT		BIT(1)
#define TYPEC_TRYSINK_DETECT_STATUS_BIT			BIT(0)

#define CMD_APSD					0x341
#define ICL_OVERRIDE_BIT				BIT(1)
#define APSD_RERUN_BIT					BIT(0)

#define TYPE_C_CFG					0x358
#define APSD_START_ON_CC_BIT				BIT(7)
#define WAIT_FOR_APSD_BIT				BIT(6)
#define FACTORY_MODE_DETECTION_EN_BIT			BIT(5)
#define FACTORY_MODE_ICL_3A_4A_BIT			BIT(4)
#define FACTORY_MODE_DIS_CHGING_CFG_BIT			BIT(3)
#define SUSPEND_NON_COMPLIANT_CFG_BIT			BIT(2)
#define VCONN_OC_CFG_BIT				BIT(1)
#define TYPE_C_OR_U_USB_BIT				BIT(0)

#define TYPE_C_CFG_2					0x359
#define TYPE_C_DFP_CURRSRC_MODE_BIT			BIT(7)
#define DFP_CC_1P4V_OR_1P6V_BIT				BIT(6)
#define VCONN_SOFTSTART_CFG_MASK			GENMASK(5, 4)
#define EN_TRY_SOURCE_MODE_BIT				BIT(3)
#define USB_FACTORY_MODE_ENABLE_BIT			BIT(2)
#define TYPE_C_UFP_MODE_BIT				BIT(1)
#define EN_80UA_180UA_CUR_SOURCE_BIT			BIT(0)

#define TYPE_C_CFG_3					0x35A
#define TVBUS_DEBOUNCE_BIT				BIT(7)
#define TYPEC_LEGACY_CABLE_INT_EN_BIT			BIT(6)
#define TYPEC_NONCOMPLIANT_LEGACY_CABLE_INT_EN_B	BIT(5)
#define TYPEC_TRYSOURCE_DETECT_INT_EN_BIT		BIT(4)
#define TYPEC_TRYSINK_DETECT_INT_EN_BIT			BIT(3)
#define EN_TRYSINK_MODE_BIT				BIT(2)
#define EN_LEGACY_CABLE_DETECTION_BIT			BIT(1)
#define ALLOW_PD_DRING_UFP_TCCDB_BIT			BIT(0)

#define USBIN_OPTIONS_1_CFG				0x362
#define CABLE_R_SEL_BIT					BIT(7)
#define HVDCP_AUTH_ALG_EN_CFG_BIT			BIT(6)
#define HVDCP_AUTONOMOUS_MODE_EN_CFG_BIT		BIT(5)
#define INPUT_PRIORITY_BIT				BIT(4)
#define AUTO_SRC_DETECT_BIT				BIT(3)
#define HVDCP_EN_BIT					BIT(2)
#define VADP_INCREMENT_VOLTAGE_LIMIT_BIT		BIT(1)
#define VADP_TAPER_TIMER_EN_BIT				BIT(0)

#define USBIN_OPTIONS_2_CFG				0x363
#define WIPWR_RST_EUD_CFG_BIT				BIT(7)
#define SWITCHER_START_CFG_BIT				BIT(6)
#define DCD_TIMEOUT_SEL_BIT				BIT(5)
#define OCD_CURRENT_SEL_BIT				BIT(4)
#define SLOW_PLUGIN_TIMER_EN_CFG_BIT			BIT(3)
#define FLOAT_OPTIONS_MASK				GENMASK(2, 0)
#define FLOAT_DIS_CHGING_CFG_BIT			BIT(2)
#define SUSPEND_FLOAT_CFG_BIT				BIT(1)
#define FORCE_FLOAT_SDP_CFG_BIT				BIT(0)

#define TAPER_TIMER_SEL_CFG				0x364
#define TYPEC_SPARE_CFG_BIT				BIT(7)
#define TYPEC_DRP_DFP_TIME_CFG_BIT			BIT(5)
#define TAPER_TIMER_SEL_MASK				GENMASK(1, 0)

#define USBIN_LOAD_CFG					0x365
#define USBIN_OV_CH_LOAD_OPTION_BIT			BIT(7)
#define ICL_OVERRIDE_AFTER_APSD_BIT			BIT(4)

#define USBIN_ICL_OPTIONS				0x366
#define CFG_USB3P0_SEL_BIT				BIT(2)
#define USB51_MODE_BIT					BIT(1)
#define USBIN_MODE_CHG_BIT				BIT(0)

#define TYPE_C_INTRPT_ENB_SOFTWARE_CTRL			0x368
#define EXIT_SNK_BASED_ON_CC_BIT			BIT(7)
#define VCONN_EN_ORIENTATION_BIT			BIT(6)
#define TYPEC_VCONN_OVERCURR_INT_EN_BIT			BIT(5)
#define VCONN_EN_SRC_BIT				BIT(4)
#define VCONN_EN_VALUE_BIT				BIT(3)
#define TYPEC_POWER_ROLE_CMD_MASK			GENMASK(2, 0)
#define UFP_EN_CMD_BIT					BIT(2)
#define DFP_EN_CMD_BIT					BIT(1)
#define TYPEC_DISABLE_CMD_BIT				BIT(0)

#define USBIN_CURRENT_LIMIT_CFG				0x370
#define USBIN_CURRENT_LIMIT_MASK			GENMASK(7, 0)

#define USBIN_AICL_OPTIONS_CFG				0x380
#define SUSPEND_ON_COLLAPSE_USBIN_BIT			BIT(7)
#define USBIN_AICL_HDC_EN_BIT				BIT(6)
#define USBIN_AICL_START_AT_MAX_BIT			BIT(5)
#define USBIN_AICL_RERUN_EN_BIT				BIT(4)
#define USBIN_AICL_ADC_EN_BIT				BIT(3)
#define USBIN_AICL_EN_BIT				BIT(2)
#define USBIN_HV_COLLAPSE_RESPONSE_BIT			BIT(1)
#define USBIN_LV_COLLAPSE_RESPONSE_BIT			BIT(0)

#define USBIN_5V_AICL_THRESHOLD_CFG			0x381
#define USBIN_5V_AICL_THRESHOLD_CFG_MASK		GENMASK(2, 0)

#define USBIN_CONT_AICL_THRESHOLD_CFG			0x384
#define USBIN_CONT_AICL_THRESHOLD_CFG_MASK		GENMASK(5, 0)

#define DC_ENG_SSUPPLY_CFG2				0x4C1
#define ENG_SSUPPLY_IVREF_OTG_SS_MASK			GENMASK(2, 0)
#define OTG_SS_SLOW					0x3

#define DCIN_AICL_REF_SEL_CFG				0x481
#define DCIN_CONT_AICL_THRESHOLD_CFG_MASK		GENMASK(5, 0)

#define WI_PWR_OPTIONS					0x495
#define CHG_OK_BIT					BIT(7)
#define WIPWR_UVLO_IRQ_OPT_BIT				BIT(6)
#define BUCK_HOLDOFF_ENABLE_BIT				BIT(5)
#define CHG_OK_HW_SW_SELECT_BIT				BIT(4)
#define WIPWR_RST_ENABLE_BIT				BIT(3)
#define DCIN_WIPWR_IRQ_SELECT_BIT			BIT(2)
#define AICL_SWITCH_ENABLE_BIT				BIT(1)
#define ZIN_ICL_ENABLE_BIT				BIT(0)

#define ICL_STATUS					0x607
#define INPUT_CURRENT_LIMIT_MASK			GENMASK(7, 0)

#define POWER_PATH_STATUS				0x60B
#define P_PATH_INPUT_SS_DONE_BIT			BIT(7)
#define P_PATH_USBIN_SUSPEND_STS_BIT			BIT(6)
#define P_PATH_DCIN_SUSPEND_STS_BIT			BIT(5)
#define P_PATH_USE_USBIN_BIT				BIT(4)
#define P_PATH_USE_DCIN_BIT				BIT(3)
#define P_PATH_POWER_PATH_MASK				GENMASK(2, 1)
#define P_PATH_VALID_INPUT_POWER_SOURCE_STS_BIT		BIT(0)

#define BARK_BITE_WDOG_PET				0x643
#define BARK_BITE_WDOG_PET_BIT				BIT(0)

#define WD_CFG						0x651
#define WATCHDOG_TRIGGER_AFP_EN_BIT			BIT(7)
#define BARK_WDOG_INT_EN_BIT				BIT(6)
#define BITE_WDOG_INT_EN_BIT				BIT(5)
#define SFT_AFTER_WDOG_IRQ_MASK				GENMASK(4, 3)
#define WDOG_IRQ_SFT_BIT				BIT(2)
#define WDOG_TIMER_EN_ON_PLUGIN_BIT			BIT(1)
#define WDOG_TIMER_EN_BIT				BIT(0)

#define SNARL_BARK_BITE_WD_CFG				0x653
#define BITE_WDOG_DISABLE_CHARGING_CFG_BIT		BIT(7)
#define SNARL_WDOG_TIMEOUT_MASK				GENMASK(6, 4)
#define BARK_WDOG_TIMEOUT_MASK				GENMASK(3, 2)
#define BITE_WDOG_TIMEOUT_MASK				GENMASK(1, 0)

#define AICL_RERUN_TIME_CFG				0x661
#define AICL_RERUN_TIME_MASK				GENMASK(1, 0)

#define STAT_CFG					0x690
#define STAT_SW_OVERRIDE_VALUE_BIT			BIT(7)
#define STAT_SW_OVERRIDE_CFG_BIT			BIT(6)
#define STAT_PARALLEL_OFF_DG_CFG_MASK			GENMASK(5, 4)
#define STAT_POLARITY_CFG_BIT				BIT(3)
#define STAT_PARALLEL_CFG_BIT				BIT(2)
#define STAT_FUNCTION_CFG_BIT				BIT(1)
#define STAT_IRQ_PULSING_EN_BIT				BIT(0)

#define SDP_CURRENT_UA					500000
#define CDP_CURRENT_UA					1500000
#define DCP_CURRENT_UA					1500000
#define CURRENT_MAX_UA					DCP_CURRENT_UA

/* pmi8998 registers represent current in increments of 1/40th of an amp */
#define CURRENT_SCALE_FACTOR				25000
/* clang-format on */

enum charger_status {
	TRICKLE_CHARGE = 0,
	PRE_CHARGE,
	FAST_CHARGE,
	FULLON_CHARGE,
	TAPER_CHARGE,
	TERMINATE_CHARGE,
	INHIBIT_CHARGE,
	DISABLE_CHARGE,
};

struct smb2_register {
	u16 addr;
	u8 mask;
	u8 val;
};

/**
 * struct smb2_chip - smb2 chip structure
 * @dev:		Device reference for power_supply
 * @name:		The platform device name
 * @base:		Base address for smb2 registers
 * @regmap:		Register map
 * @batt_info:		Battery data from DT
 * @status_change_work: Worker to handle plug/unplug events
 * @cable_irq:		USB plugin IRQ
 * @wakeup_enabled:	If the cable IRQ will cause a wakeup
 * @usb_in_i_chan:	USB_IN current measurement channel
 * @usb_in_v_chan:	USB_IN voltage measurement channel
 * @chg_psy:		Charger power supply instance
 */
struct smb2_chip {
	struct device *dev;
	const char *name;
	unsigned int base;
	struct regmap *regmap;
	struct power_supply_battery_info *batt_info;

	struct delayed_work status_change_work;
	int cable_irq;
	bool wakeup_enabled;

	struct iio_channel *usb_in_i_chan;
	struct iio_channel *usb_in_v_chan;

	struct power_supply *chg_psy;
};

static enum power_supply_property smb2_properties[] = {
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_USB_TYPE,
};

static int smb2_get_prop_usb_online(struct smb2_chip *chip, int *val)
{
	unsigned int stat;
	int rc;

	rc = regmap_read(chip->regmap, chip->base + POWER_PATH_STATUS, &stat);
	if (rc < 0) {
		dev_err(chip->dev, "Couldn't read power path status: %d\n", rc);
		return rc;
	}

	*val = (stat & P_PATH_USE_USBIN_BIT) &&
	       (stat & P_PATH_VALID_INPUT_POWER_SOURCE_STS_BIT);
	return 0;
}

/*
 * Qualcomm "automatic power source detection" aka APSD
 * tells us what type of charger we're connected to.
 */
static int smb2_apsd_get_charger_type(struct smb2_chip *chip, int *val)
{
	unsigned int apsd_stat, stat;
	int usb_online = 0;
	int rc;

	rc = smb2_get_prop_usb_online(chip, &usb_online);
	if (!usb_online) {
		*val = POWER_SUPPLY_USB_TYPE_UNKNOWN;
		return rc;
	}

	rc = regmap_read(chip->regmap, chip->base + APSD_STATUS, &apsd_stat);
	if (rc < 0) {
		dev_err(chip->dev, "Failed to read apsd status, rc = %d", rc);
		return rc;
	}
	if (!(apsd_stat & APSD_DTC_STATUS_DONE_BIT)) {
		dev_dbg(chip->dev, "Apsd not ready");
		return -EAGAIN;
	}

	rc = regmap_read(chip->regmap, chip->base + APSD_RESULT_STATUS, &stat);
	if (rc < 0) {
		dev_err(chip->dev, "Failed to read apsd result, rc = %d", rc);
		return rc;
	}

	stat &= APSD_RESULT_STATUS_MASK;

	if (stat & CDP_CHARGER_BIT)
		*val = POWER_SUPPLY_USB_TYPE_CDP;
	else if (stat & (DCP_CHARGER_BIT | OCP_CHARGER_BIT | FLOAT_CHARGER_BIT))
		*val = POWER_SUPPLY_USB_TYPE_DCP;
	else /* SDP_CHARGER_BIT (or others) */
		*val = POWER_SUPPLY_USB_TYPE_SDP;

	return 0;
}

static int smb2_get_prop_status(struct smb2_chip *chip, int *val)
{
	unsigned char stat[2];
	int usb_online = 0;
	int rc;

	rc = smb2_get_prop_usb_online(chip, &usb_online);
	if (!usb_online) {
		*val = POWER_SUPPLY_STATUS_DISCHARGING;
		return rc;
	}

	rc = regmap_bulk_read(chip->regmap,
			      chip->base + BATTERY_CHARGER_STATUS_1, &stat, 2);
	if (rc < 0) {
		dev_err(chip->dev, "Failed to read charging status ret=%d\n",
			rc);
		return rc;
	}

	if (stat[1] & CHARGER_ERROR_STATUS_BAT_OV_BIT) {
		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		return 0;
	}

	stat[0] = stat[0] & BATTERY_CHARGER_STATUS_MASK;

	switch (stat[0]) {
	case TRICKLE_CHARGE:
	case PRE_CHARGE:
	case FAST_CHARGE:
	case FULLON_CHARGE:
	case TAPER_CHARGE:
		*val = POWER_SUPPLY_STATUS_CHARGING;
		return rc;
	case DISABLE_CHARGE:
		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		return rc;
	case TERMINATE_CHARGE:
	case INHIBIT_CHARGE:
		*val = POWER_SUPPLY_STATUS_FULL;
		return rc;
	default:
		*val = POWER_SUPPLY_STATUS_UNKNOWN;
		return rc;
	}
}

static inline int smb2_get_current_limit(struct smb2_chip *chip,
					 unsigned int *val)
{
	int rc = regmap_read(chip->regmap, chip->base + ICL_STATUS, val);

	if (rc >= 0)
		*val *= CURRENT_SCALE_FACTOR;
	return rc;
}

static int smb2_set_current_limit(struct smb2_chip *chip, unsigned int val)
{
	unsigned char val_raw;

	if (val > 4800000) {
		dev_err(chip->dev,
			"Can't set current limit higher than 4800000uA");
		return -EINVAL;
	}
	val_raw = val / CURRENT_SCALE_FACTOR;

	return regmap_write(chip->regmap, chip->base + USBIN_CURRENT_LIMIT_CFG,
			    val_raw);
}

static void smb2_status_change_work(struct work_struct *work)
{
	unsigned int charger_type, current_ua;
	int usb_online = 0;
	int count, rc;
	struct smb2_chip *chip;

	chip = container_of(work, struct smb2_chip, status_change_work.work);

	smb2_get_prop_usb_online(chip, &usb_online);
	if (!usb_online)
		return;

	for (count = 0; count < 3; count++) {
		dev_dbg(chip->dev, "get charger type retry %d\n", count);
		rc = smb2_apsd_get_charger_type(chip, &charger_type);
		if (rc != -EAGAIN)
			break;
		msleep(100);
	}

	if (rc < 0 && rc != -EAGAIN) {
		dev_err(chip->dev, "get charger type failed: %d\n", rc);
		return;
	}

	if (rc < 0) {
		rc = regmap_update_bits(chip->regmap, chip->base + CMD_APSD,
					APSD_RERUN_BIT, APSD_RERUN_BIT);
		schedule_delayed_work(&chip->status_change_work,
				      msecs_to_jiffies(1000));
		dev_dbg(chip->dev, "get charger type failed, rerun apsd\n");
		return;
	}

	switch (charger_type) {
	case POWER_SUPPLY_USB_TYPE_CDP:
		current_ua = CDP_CURRENT_UA;
		break;
	case POWER_SUPPLY_USB_TYPE_DCP:
		current_ua = DCP_CURRENT_UA;
		break;
	case POWER_SUPPLY_USB_TYPE_SDP:
	default:
		current_ua = SDP_CURRENT_UA;
		break;
	}

	smb2_set_current_limit(chip, current_ua);
	power_supply_changed(chip->chg_psy);
}

static int smb2_get_iio_chan(struct smb2_chip *chip, struct iio_channel *chan,
			     int *val)
{
	int rc;
	union power_supply_propval status;

	rc = power_supply_get_property(chip->chg_psy, POWER_SUPPLY_PROP_STATUS,
				       &status);
	if (rc < 0 || status.intval != POWER_SUPPLY_STATUS_CHARGING) {
		*val = 0;
		return 0;
	}

	if (IS_ERR(chan)) {
		dev_err(chip->dev, "Failed to chan, err = %li", PTR_ERR(chan));
		return PTR_ERR(chan);
	}

	return iio_read_channel_processed(chan, val);
}

static int smb2_get_prop_health(struct smb2_chip *chip, int *val)
{
	int rc;
	unsigned int stat;

	rc = regmap_read(chip->regmap, chip->base + BATTERY_CHARGER_STATUS_2,
			 &stat);
	if (rc < 0) {
		dev_err(chip->dev, "Couldn't read charger status rc=%d\n", rc);
		return rc;
	}

	switch (stat) {
	case CHARGER_ERROR_STATUS_BAT_OV_BIT:
		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		return 0;
	case BAT_TEMP_STATUS_TOO_COLD_BIT:
		*val = POWER_SUPPLY_HEALTH_COLD;
		return 0;
	case BAT_TEMP_STATUS_TOO_HOT_BIT:
		*val = POWER_SUPPLY_HEALTH_OVERHEAT;
		return 0;
	case BAT_TEMP_STATUS_COLD_SOFT_LIMIT_BIT:
		*val = POWER_SUPPLY_HEALTH_COOL;
		return 0;
	case BAT_TEMP_STATUS_HOT_SOFT_LIMIT_BIT:
		*val = POWER_SUPPLY_HEALTH_WARM;
		return 0;
	default:
		*val = POWER_SUPPLY_HEALTH_GOOD;
		return 0;
	}
}

static int smb2_get_property(struct power_supply *psy,
			     enum power_supply_property psp,
			     union power_supply_propval *val)
{
	struct smb2_chip *chip = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = "Qualcomm";
		return 0;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = chip->name;
		return 0;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		return smb2_get_current_limit(chip, &val->intval);
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		return smb2_get_iio_chan(chip, chip->usb_in_i_chan,
					 &val->intval);
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		return smb2_get_iio_chan(chip, chip->usb_in_v_chan,
					 &val->intval);
	case POWER_SUPPLY_PROP_ONLINE:
		return smb2_get_prop_usb_online(chip, &val->intval);
	case POWER_SUPPLY_PROP_STATUS:
		return smb2_get_prop_status(chip, &val->intval);
	case POWER_SUPPLY_PROP_HEALTH:
		return smb2_get_prop_health(chip, &val->intval);
	case POWER_SUPPLY_PROP_USB_TYPE:
		return smb2_apsd_get_charger_type(chip, &val->intval);
	default:
		dev_err(chip->dev, "invalid property: %d\n", psp);
		return -EINVAL;
	}
}

static int smb2_set_property(struct power_supply *psy,
			     enum power_supply_property psp,
			     const union power_supply_propval *val)
{
	struct smb2_chip *chip = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		return smb2_set_current_limit(chip, val->intval);
	default:
		dev_err(chip->dev, "No setter for property: %d\n", psp);
		return -EINVAL;
	}
}

static int smb2_property_is_writable(struct power_supply *psy,
				     enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		return 1;
	default:
		return 0;
	}
}

static irqreturn_t smb2_handle_batt_overvoltage(int irq, void *data)
{
	struct smb2_chip *chip = data;
	unsigned int status;

	regmap_read(chip->regmap, chip->base + BATTERY_CHARGER_STATUS_2,
		    &status);

	if (status & CHARGER_ERROR_STATUS_BAT_OV_BIT) {
		/* The hardware stops charging automatically */
		dev_err(chip->dev, "battery overvoltage detected\n");
		power_supply_changed(chip->chg_psy);
	}

	return IRQ_HANDLED;
}

static irqreturn_t smb2_handle_usb_plugin(int irq, void *data)
{
	struct smb2_chip *chip = data;

	power_supply_changed(chip->chg_psy);

	schedule_delayed_work(&chip->status_change_work,
			      msecs_to_jiffies(1500));

	return IRQ_HANDLED;
}

static irqreturn_t smb2_handle_usb_icl_change(int irq, void *data)
{
	struct smb2_chip *chip = data;

	power_supply_changed(chip->chg_psy);

	return IRQ_HANDLED;
}

static irqreturn_t smb2_handle_wdog_bark(int irq, void *data)
{
	struct smb2_chip *chip = data;
	int rc;

	power_supply_changed(chip->chg_psy);

	rc = regmap_write(chip->regmap, BARK_BITE_WDOG_PET,
			  BARK_BITE_WDOG_PET_BIT);
	if (rc < 0)
		dev_err(chip->dev, "Couldn't pet the dog rc=%d\n", rc);

	return IRQ_HANDLED;
}

static const struct power_supply_desc smb2_psy_desc = {
	.name = "pmi8998_charger",
	.type = POWER_SUPPLY_TYPE_USB,
	.usb_types = BIT(POWER_SUPPLY_USB_TYPE_SDP) |
		     BIT(POWER_SUPPLY_USB_TYPE_CDP) |
		     BIT(POWER_SUPPLY_USB_TYPE_DCP) |
		     BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN),
	.properties = smb2_properties,
	.num_properties = ARRAY_SIZE(smb2_properties),
	.get_property = smb2_get_property,
	.set_property = smb2_set_property,
	.property_is_writeable = smb2_property_is_writable,
};

/* Init sequence derived from vendor downstream driver */
static const struct smb2_register smb2_init_seq[] = {
	{ .addr = AICL_RERUN_TIME_CFG, .mask = AICL_RERUN_TIME_MASK, .val = 0 },
	/*
	 * By default configure us as an upstream facing port
	 * FIXME: This will be handled by the type-c driver
	 */
	{ .addr = TYPE_C_INTRPT_ENB_SOFTWARE_CTRL,
	  .mask = TYPEC_POWER_ROLE_CMD_MASK | VCONN_EN_SRC_BIT |
		  VCONN_EN_VALUE_BIT,
	  .val = VCONN_EN_SRC_BIT },
	/*
	 * Disable Type-C factory mode and stay in Attached.SRC state when VCONN
	 * over-current happens
	 */
	{ .addr = TYPE_C_CFG,
	  .mask = FACTORY_MODE_DETECTION_EN_BIT | VCONN_OC_CFG_BIT,
	  .val = 0 },
	/* Configure VBUS for software control */
	{ .addr = OTG_CFG, .mask = OTG_EN_SRC_CFG_BIT, .val = 0 },
	/*
	 * Use VBAT to determine the recharge threshold when battery is full
	 * rather than the state of charge.
	 */
	{ .addr = FG_UPDATE_CFG_2_SEL,
	  .mask = SOC_LT_CHG_RECHARGE_THRESH_SEL_BIT |
		  VBT_LT_CHG_RECHARGE_THRESH_SEL_BIT,
	  .val = VBT_LT_CHG_RECHARGE_THRESH_SEL_BIT },
	/* Enable charging */
	{ .addr = USBIN_OPTIONS_1_CFG, .mask = HVDCP_EN_BIT, .val = 0 },
	{ .addr = CHARGING_ENABLE_CMD,
	  .mask = CHARGING_ENABLE_CMD_BIT,
	  .val = CHARGING_ENABLE_CMD_BIT },
	/*
	 * Match downstream defaults
	 * CHG_EN_SRC_BIT - charger enable is controlled by software
	 * CHG_EN_POLARITY_BIT - polarity of charge enable pin when in HW control
	 *                       pulled low on OnePlus 6 and SHIFT6mq
	 * PRETOFAST_TRANSITION_CFG_BIT -
	 * BAT_OV_ECC_BIT -
	 * I_TERM_BIT - Current termination ?? 0 = enabled
	 * AUTO_RECHG_BIT - Enable automatic recharge when battery is full
	 *                  0 = enabled
	 * EN_ANALOG_DROP_IN_VBATT_BIT
	 * CHARGER_INHIBIT_BIT - Inhibit charging based on battery voltage
	 *                       instead of ??
	 */
	{ .addr = CHGR_CFG2,
	  .mask = CHG_EN_SRC_BIT | CHG_EN_POLARITY_BIT |
		  PRETOFAST_TRANSITION_CFG_BIT | BAT_OV_ECC_BIT | I_TERM_BIT |
		  AUTO_RECHG_BIT | EN_ANALOG_DROP_IN_VBATT_BIT |
		  CHARGER_INHIBIT_BIT,
	  .val = CHARGER_INHIBIT_BIT },
	/* STAT pin software override, match downstream. Parallell charging? */
	{ .addr = STAT_CFG,
	  .mask = STAT_SW_OVERRIDE_CFG_BIT,
	  .val = STAT_SW_OVERRIDE_CFG_BIT },
	/* Set the default SDP charger type to a 500ma USB 2.0 port */
	{ .addr = USBIN_ICL_OPTIONS,
	  .mask = USB51_MODE_BIT | USBIN_MODE_CHG_BIT,
	  .val = USB51_MODE_BIT },
	/* Disable watchdog */
	{ .addr = SNARL_BARK_BITE_WD_CFG, .mask = 0xff, .val = 0 },
	{ .addr = WD_CFG,
	  .mask = WATCHDOG_TRIGGER_AFP_EN_BIT | WDOG_TIMER_EN_ON_PLUGIN_BIT |
		  BARK_WDOG_INT_EN_BIT,
	  .val = 0 },
	/* These bits aren't documented anywhere */
	{ .addr = USBIN_5V_AICL_THRESHOLD_CFG,
	  .mask = USBIN_5V_AICL_THRESHOLD_CFG_MASK,
	  .val = 0x3 },
	{ .addr = USBIN_CONT_AICL_THRESHOLD_CFG,
	  .mask = USBIN_CONT_AICL_THRESHOLD_CFG_MASK,
	  .val = 0x3 },
	/*
	 * Enable Automatic Input Current Limit, this will slowly ramp up the current
	 * When connected to a wall charger, and automatically stop when it detects
	 * the charger current limit (voltage drop?) or it reaches the programmed limit.
	 */
	{ .addr = USBIN_AICL_OPTIONS_CFG,
	  .mask = USBIN_AICL_START_AT_MAX_BIT | USBIN_AICL_ADC_EN_BIT |
		  USBIN_AICL_EN_BIT | SUSPEND_ON_COLLAPSE_USBIN_BIT |
		  USBIN_HV_COLLAPSE_RESPONSE_BIT |
		  USBIN_LV_COLLAPSE_RESPONSE_BIT,
	  .val = USBIN_HV_COLLAPSE_RESPONSE_BIT |
		 USBIN_LV_COLLAPSE_RESPONSE_BIT | USBIN_AICL_EN_BIT },
	/*
	 * Set pre charge current to default, the OnePlus 6 bootloader
	 * sets this very conservatively.
	 */
	{ .addr = PRE_CHARGE_CURRENT_CFG,
	  .mask = PRE_CHARGE_CURRENT_SETTING_MASK,
	  .val = 500000 / CURRENT_SCALE_FACTOR },
	/*
	 * This overrides all of the current limit options exposed to userspace
	 * and prevents the device from pulling more than ~1A. This is done
	 * to minimise potential fire hazard risks.
	 */
	{ .addr = FAST_CHARGE_CURRENT_CFG,
	  .mask = FAST_CHARGE_CURRENT_SETTING_MASK,
	  .val = 1000000 / CURRENT_SCALE_FACTOR },
};

static int smb2_init_hw(struct smb2_chip *chip)
{
	int rc, i;

	for (i = 0; i < ARRAY_SIZE(smb2_init_seq); i++) {
		dev_dbg(chip->dev, "%d: Writing 0x%02x to 0x%02x\n", i,
			smb2_init_seq[i].val, smb2_init_seq[i].addr);
		rc = regmap_update_bits(chip->regmap,
					chip->base + smb2_init_seq[i].addr,
					smb2_init_seq[i].mask,
					smb2_init_seq[i].val);
		if (rc < 0)
			return dev_err_probe(chip->dev, rc,
					     "%s: init command %d failed\n",
					     __func__, i);
	}

	return 0;
}

static int smb2_init_irq(struct smb2_chip *chip, int *irq, const char *name,
			 irqreturn_t (*handler)(int irq, void *data))
{
	int irqnum;
	int rc;

	irqnum = platform_get_irq_byname(to_platform_device(chip->dev), name);
	if (irqnum < 0)
		return irqnum;

	rc = devm_request_threaded_irq(chip->dev, irqnum, NULL, handler,
				       IRQF_ONESHOT, name, chip);
	if (rc < 0)
		return dev_err_probe(chip->dev, rc, "Couldn't request irq %s\n",
				     name);

	if (irq)
		*irq = irqnum;

	return 0;
}

static int smb2_probe(struct platform_device *pdev)
{
	struct power_supply_config supply_config = {};
	struct power_supply_desc *desc;
	struct smb2_chip *chip;
	int rc, irq;

	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->dev = &pdev->dev;
	chip->name = pdev->name;

	chip->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!chip->regmap)
		return dev_err_probe(chip->dev, -ENODEV,
				     "failed to locate the regmap\n");

	rc = device_property_read_u32(chip->dev, "reg", &chip->base);
	if (rc < 0)
		return dev_err_probe(chip->dev, rc,
				     "Couldn't read base address\n");

	chip->usb_in_v_chan = devm_iio_channel_get(chip->dev, "usbin_v");
	if (IS_ERR(chip->usb_in_v_chan))
		return dev_err_probe(chip->dev, PTR_ERR(chip->usb_in_v_chan),
				     "Couldn't get usbin_v IIO channel\n");

	chip->usb_in_i_chan = devm_iio_channel_get(chip->dev, "usbin_i");
	if (IS_ERR(chip->usb_in_i_chan)) {
		return dev_err_probe(chip->dev, PTR_ERR(chip->usb_in_i_chan),
				     "Couldn't get usbin_i IIO channel\n");
	}

	rc = smb2_init_hw(chip);
	if (rc < 0)
		return rc;

	supply_config.drv_data = chip;
	supply_config.of_node = pdev->dev.of_node;

	desc = devm_kzalloc(chip->dev, sizeof(smb2_psy_desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	memcpy(desc, &smb2_psy_desc, sizeof(smb2_psy_desc));
	desc->name =
		devm_kasprintf(chip->dev, GFP_KERNEL, "%s-charger",
			       (const char *)device_get_match_data(chip->dev));
	if (!desc->name)
		return -ENOMEM;

	chip->chg_psy =
		devm_power_supply_register(chip->dev, desc, &supply_config);
	if (IS_ERR(chip->chg_psy))
		return dev_err_probe(chip->dev, PTR_ERR(chip->chg_psy),
				     "failed to register power supply\n");

	rc = power_supply_get_battery_info(chip->chg_psy, &chip->batt_info);
	if (rc)
		return dev_err_probe(chip->dev, rc,
				     "Failed to get battery info\n");

	rc = devm_delayed_work_autocancel(chip->dev, &chip->status_change_work,
					  smb2_status_change_work);
	if (rc)
		return dev_err_probe(chip->dev, rc,
				     "Failed to init status change work\n");

	rc = (chip->batt_info->voltage_max_design_uv - 3487500) / 7500 + 1;
	rc = regmap_update_bits(chip->regmap, chip->base + FLOAT_VOLTAGE_CFG,
				FLOAT_VOLTAGE_SETTING_MASK, rc);
	if (rc < 0)
		return dev_err_probe(chip->dev, rc, "Couldn't set vbat max\n");

	rc = smb2_init_irq(chip, &irq, "bat-ov", smb2_handle_batt_overvoltage);
	if (rc < 0)
		return rc;

	rc = smb2_init_irq(chip, &chip->cable_irq, "usb-plugin",
			   smb2_handle_usb_plugin);
	if (rc < 0)
		return rc;

	rc = smb2_init_irq(chip, &irq, "usbin-icl-change",
			   smb2_handle_usb_icl_change);
	if (rc < 0)
		return rc;
	rc = smb2_init_irq(chip, &irq, "wdog-bark", smb2_handle_wdog_bark);
	if (rc < 0)
		return rc;

	rc = dev_pm_set_wake_irq(chip->dev, chip->cable_irq);
	if (rc < 0)
		return dev_err_probe(chip->dev, rc, "Couldn't set wake irq\n");

	platform_set_drvdata(pdev, chip);

	/* Initialise charger state */
	schedule_delayed_work(&chip->status_change_work, 0);

	return 0;
}

static const struct of_device_id smb2_match_id_table[] = {
	{ .compatible = "qcom,pmi8998-charger", .data = "pmi8998" },
	{ .compatible = "qcom,pm660-charger", .data = "pm660" },
	{ /* sentinal */ }
};
MODULE_DEVICE_TABLE(of, smb2_match_id_table);

static struct platform_driver qcom_spmi_smb2 = {
	.probe = smb2_probe,
	.driver = {
		.name = "qcom-pmi8998/pm660-charger",
		.of_match_table = smb2_match_id_table,
		},
};

module_platform_driver(qcom_spmi_smb2);

MODULE_AUTHOR("Caleb Connolly <caleb.connolly@linaro.org>");
MODULE_DESCRIPTION("Qualcomm SMB2 Charger Driver");
MODULE_LICENSE("GPL");