Merge tag 'for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset updates from Sebastian Reichel:
 "Core:
   - Ensure HWMON devices are registered with valid names
   - Fix device wakeup code

  Drivers:
   - bq25890_charger: Add BQ25895 support
   - axp288_fuel_gauge: Add Minix Neo Z83-4 to blacklist
   - sc27xx: improve battery calibration
   - misc small fixes all over drivers"

* tag 'for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (24 commits)
  power: supply: cpcap-charger: Enable vbus boost voltage
  power: supply: sc27xx: Add POWER_SUPPLY_PROP_CALIBRATE attribute
  power: supply: sc27xx: Optimize the battery capacity calibration
  power: supply: sc27xx: Make sure the alarm capacity is larger than 0
  power: supply: sc27xx: Fix the the accuracy issue of coulomb calculation
  power: supply: sc27xx: Fix conditon to enable the FGU interrupt
  power: supply: sc27xx: Add POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN attribute
  power: supply: max77650: add MODULE_ALIAS()
  power: supply: isp1704: remove redundant assignment to variable ret
  power: supply: bq25890_charger: Add the BQ25895 part
  power: supply: sc27xx: Replace devm_add_action() followed by failure action with devm_add_action_or_reset()
  power: supply: sc27xx: Introduce local variable 'struct device *dev'
  power: reset: reboot-mode: Fix author email format
  power: supply: ab8500: remove set but not used variables 'vbup33_vrtcn' and 'bup_vch_range'
  power: supply: max17042_battery: Fix a typo in function names
  power: reset: gpio-restart: Fix typo when gpio reset is not found
  power: supply: Init device wakeup after device_add()
  power: supply: ab8500_charger: Mark expected switch fall-through
  power: supply: sbs-battery: only return health when battery present
  MAINTAINERS: N900: Remove isp1704_charger.h record
  ...

11 files changed, 230 insertions, 114 deletions

diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index 86d88aec94a1..e51d0e72beea 100644
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -742,7 +742,7 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 						USB_CH_IP_CUR_LVL_1P5;
 			break;
 		}
-		/* Else, fall through */
+		/* else, fall through */
 	case USB_STAT_HM_IDGND:
 		dev_err(di->dev, "USB Type - Charging not allowed\n");
 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
@@ -3011,7 +3011,6 @@ static int ab8500_charger_usb_get_property(struct power_supply *psy,
 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
 {
 	int ret = 0;
-	u8 bup_vch_range = 0, vbup33_vrtcn = 0;
 
 	/* Setup maximum charger current and voltage for ABB cut2.0 */
 	if (!is_ab8500_1p1_or_earlier(di->parent)) {
@@ -3112,12 +3111,6 @@ static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
 		goto out;
 	}
 
-	/* Backup battery voltage and current */
-	if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
-		bup_vch_range = BUP_VCH_RANGE;
-	if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
-		vbup33_vrtcn = VBUP33_VRTCN;
-
 	ret = abx500_set_register_interruptible(di->dev,
 		AB8500_RTC,
 		AB8500_RTC_BACKUP_CHG_REG,
diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c
index 44169dabb705..e1bc4e6e6f30 100644
--- a/drivers/power/supply/axp288_fuel_gauge.c
+++ b/drivers/power/supply/axp288_fuel_gauge.c
@@ -674,6 +674,7 @@ intr_failed:
 /*
  * Some devices have no battery (HDMI sticks) and the axp288 battery's
  * detection reports one despite it not being there.
+ * Please keep this listed sorted alphabetically.
  */
 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
 	{
@@ -697,6 +698,12 @@ static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
 		},
 	},
 	{
+		/* ECS EF20EA */
+		.matches = {
+			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
+		},
+	},
+	{
 		/* Intel Cherry Trail Compute Stick, Windows version */
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
@@ -720,10 +727,11 @@ static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
 		},
 	},
 	{
-		/* ECS EF20EA */
+		/* Minix Neo Z83-4 mini PC */
 		.matches = {
-			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
-		},
+			DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
+		}
 	},
 	{}
 };
diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index d333f2b321b9..9d1ec8d677de 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -22,6 +22,7 @@
 #define BQ25890_IRQ_PIN			"bq25890_irq"
 
 #define BQ25890_ID			3
+#define BQ25895_ID			7
 #define BQ25896_ID			0
 
 enum bq25890_fields {
@@ -171,7 +172,7 @@ static const struct reg_field bq25890_reg_fields[] = {
 	[F_WD]			= REG_FIELD(0x07, 4, 5),
 	[F_TMR_EN]		= REG_FIELD(0x07, 3, 3),
 	[F_CHG_TMR]		= REG_FIELD(0x07, 1, 2),
-	[F_JEITA_ISET]		= REG_FIELD(0x07, 0, 0),
+	[F_JEITA_ISET]		= REG_FIELD(0x07, 0, 0), // reserved on BQ25895
 	/* REG08 */
 	[F_BATCMP]		= REG_FIELD(0x08, 5, 7),
 	[F_VCLAMP]		= REG_FIELD(0x08, 2, 4),
@@ -180,7 +181,7 @@ static const struct reg_field bq25890_reg_fields[] = {
 	[F_FORCE_ICO]		= REG_FIELD(0x09, 7, 7),
 	[F_TMR2X_EN]		= REG_FIELD(0x09, 6, 6),
 	[F_BATFET_DIS]		= REG_FIELD(0x09, 5, 5),
-	[F_JEITA_VSET]		= REG_FIELD(0x09, 4, 4),
+	[F_JEITA_VSET]		= REG_FIELD(0x09, 4, 4), // reserved on BQ25895
 	[F_BATFET_DLY]		= REG_FIELD(0x09, 3, 3),
 	[F_BATFET_RST_EN]	= REG_FIELD(0x09, 2, 2),
 	[F_PUMPX_UP]		= REG_FIELD(0x09, 1, 1),
@@ -188,7 +189,7 @@ static const struct reg_field bq25890_reg_fields[] = {
 	/* REG0A */
 	[F_BOOSTV]		= REG_FIELD(0x0A, 4, 7),
 	/* PFM_OTG_DIS 3 on BQ25896 */
-	[F_BOOSTI]		= REG_FIELD(0x0A, 0, 2),
+	[F_BOOSTI]		= REG_FIELD(0x0A, 0, 2), // reserved on BQ25895
 	/* REG0B */
 	[F_VBUS_STAT]		= REG_FIELD(0x0B, 5, 7),
 	[F_CHG_STAT]		= REG_FIELD(0x0B, 3, 4),
@@ -392,6 +393,8 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		if (bq->chip_id == BQ25890_ID)
 			val->strval = "BQ25890";
+		else if (bq->chip_id == BQ25895_ID)
+			val->strval = "BQ25895";
 		else if (bq->chip_id == BQ25896_ID)
 			val->strval = "BQ25896";
 		else
@@ -862,7 +865,8 @@ static int bq25890_probe(struct i2c_client *client,
 		return bq->chip_id;
 	}
 
-	if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) {
+	if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25895_ID)
+			&& (bq->chip_id != BQ25896_ID)) {
 		dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
 		return -ENODEV;
 	}
diff --git a/drivers/power/supply/cpcap-charger.c b/drivers/power/supply/cpcap-charger.c
index cc546bc40a78..74258c7fe17d 100644
--- a/drivers/power/supply/cpcap-charger.c
+++ b/drivers/power/supply/cpcap-charger.c
@@ -108,6 +108,9 @@
 #define CPCAP_REG_CRM_ICHRG_1A596	CPCAP_REG_CRM_ICHRG(0xe)
 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT	CPCAP_REG_CRM_ICHRG(0xf)
 
+/* CPCAP_REG_VUSBC register bits needed for VBUS */
+#define CPCAP_BIT_VBUS_SWITCH		BIT(0)	/* VBUS boost to 5V */
+
 enum {
 	CPCAP_CHARGER_IIO_BATTDET,
 	CPCAP_CHARGER_IIO_VOLTAGE,
@@ -130,7 +133,8 @@ struct cpcap_charger_ddata {
 	struct power_supply *usb;
 
 	struct phy_companion comparator;	/* For USB VBUS */
-	bool vbus_enabled;
+	unsigned int vbus_enabled:1;
+	unsigned int feeding_vbus:1;
 	atomic_t active;
 
 	int status;
@@ -325,7 +329,6 @@ static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 }
 
 /* VBUS control functions for the USB PHY companion */
-
 static void cpcap_charger_vbus_work(struct work_struct *work)
 {
 	struct cpcap_charger_ddata *ddata;
@@ -343,6 +346,7 @@ static void cpcap_charger_vbus_work(struct work_struct *work)
 			return;
 		}
 
+		ddata->feeding_vbus = true;
 		cpcap_charger_set_cable_path(ddata, false);
 		cpcap_charger_set_inductive_path(ddata, false);
 
@@ -350,12 +354,23 @@ static void cpcap_charger_vbus_work(struct work_struct *work)
 		if (error)
 			goto out_err;
 
+		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
+					   CPCAP_BIT_VBUS_SWITCH,
+					   CPCAP_BIT_VBUS_SWITCH);
+		if (error)
+			goto out_err;
+
 		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 					   CPCAP_REG_CRM_RVRSMODE,
 					   CPCAP_REG_CRM_RVRSMODE);
 		if (error)
 			goto out_err;
 	} else {
+		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
+					   CPCAP_BIT_VBUS_SWITCH, 0);
+		if (error)
+			goto out_err;
+
 		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 					   CPCAP_REG_CRM_RVRSMODE, 0);
 		if (error)
@@ -363,6 +378,7 @@ static void cpcap_charger_vbus_work(struct work_struct *work)
 
 		cpcap_charger_set_cable_path(ddata, true);
 		cpcap_charger_set_inductive_path(ddata, true);
+		ddata->feeding_vbus = false;
 	}
 
 	return;
@@ -431,7 +447,8 @@ static void cpcap_usb_detect(struct work_struct *work)
 	if (error)
 		return;
 
-	if (cpcap_charger_vbus_valid(ddata) && s.chrgcurr1) {
+	if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
+	    s.chrgcurr1) {
 		int max_current;
 
 		if (cpcap_charger_battery_found(ddata))
diff --git a/drivers/power/supply/isp1704_charger.c b/drivers/power/supply/isp1704_charger.c
index b48cb7aba97b..4812ac1ff2df 100644
--- a/drivers/power/supply/isp1704_charger.c
+++ b/drivers/power/supply/isp1704_charger.c
@@ -342,7 +342,7 @@ static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
 	int vendor;
 	int product;
 	int i;
-	int ret = -ENODEV;
+	int ret;
 
 	/* Test ULPI interface */
 	ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
index 64f3358eaa3c..0dfad2cf13fe 100644
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -511,7 +511,7 @@ static inline void max17042_override_por(struct regmap *map,
 		regmap_write(map, reg, value);
 }
 
-static inline void max10742_unlock_model(struct max17042_chip *chip)
+static inline void max17042_unlock_model(struct max17042_chip *chip)
 {
 	struct regmap *map = chip->regmap;
 
@@ -519,7 +519,7 @@ static inline void max10742_unlock_model(struct max17042_chip *chip)
 	regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
 }
 
-static inline void max10742_lock_model(struct max17042_chip *chip)
+static inline void max17042_lock_model(struct max17042_chip *chip)
 {
 	struct regmap *map = chip->regmap;
 
@@ -577,7 +577,7 @@ static int max17042_init_model(struct max17042_chip *chip)
 	if (!temp_data)
 		return -ENOMEM;
 
-	max10742_unlock_model(chip);
+	max17042_unlock_model(chip);
 	max17042_write_model_data(chip, MAX17042_MODELChrTbl,
 				table_size);
 	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
@@ -589,7 +589,7 @@ static int max17042_init_model(struct max17042_chip *chip)
 		temp_data,
 		table_size);
 
-	max10742_lock_model(chip);
+	max17042_lock_model(chip);
 	kfree(temp_data);
 
 	return ret;
diff --git a/drivers/power/supply/max77650-charger.c b/drivers/power/supply/max77650-charger.c
index e34714cb05ec..5f9477c5cf5a 100644
--- a/drivers/power/supply/max77650-charger.c
+++ b/drivers/power/supply/max77650-charger.c
@@ -366,3 +366,4 @@ module_platform_driver(max77650_charger_driver);
 MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
 MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:max77650-charger");
diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 82e84801264c..5c36c430ce8b 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -1051,14 +1051,14 @@ __power_supply_register(struct device *parent,
 	}
 
 	spin_lock_init(&psy->changed_lock);
-	rc = device_init_wakeup(dev, ws);
-	if (rc)
-		goto wakeup_init_failed;
-
 	rc = device_add(dev);
 	if (rc)
 		goto device_add_failed;
 
+	rc = device_init_wakeup(dev, ws);
+	if (rc)
+		goto wakeup_init_failed;
+
 	rc = psy_register_thermal(psy);
 	if (rc)
 		goto register_thermal_failed;
@@ -1101,8 +1101,8 @@ register_cooler_failed:
 	psy_unregister_thermal(psy);
 register_thermal_failed:
 	device_del(dev);
-device_add_failed:
 wakeup_init_failed:
+device_add_failed:
 check_supplies_failed:
 dev_set_name_failed:
 	put_device(dev);
diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
index 51fe60440d12..75cf861ba492 100644
--- a/drivers/power/supply/power_supply_hwmon.c
+++ b/drivers/power/supply/power_supply_hwmon.c
@@ -284,6 +284,7 @@ int power_supply_add_hwmon_sysfs(struct power_supply *psy)
 	struct device *dev = &psy->dev;
 	struct device *hwmon;
 	int ret, i;
+	const char *name;
 
 	if (!devres_open_group(dev, power_supply_add_hwmon_sysfs,
 			       GFP_KERNEL))
@@ -334,7 +335,19 @@ int power_supply_add_hwmon_sysfs(struct power_supply *psy)
 		}
 	}
 
-	hwmon = devm_hwmon_device_register_with_info(dev, psy->desc->name,
+	name = psy->desc->name;
+	if (strchr(name, '-')) {
+		char *new_name;
+
+		new_name = devm_kstrdup(dev, name, GFP_KERNEL);
+		if (!new_name) {
+			ret = -ENOMEM;
+			goto error;
+		}
+		strreplace(new_name, '-', '_');
+		name = new_name;
+	}
+	hwmon = devm_hwmon_device_register_with_info(dev, name,
 						psyhw,
 						&power_supply_hwmon_chip_info,
 						NULL);
diff --git a/drivers/power/supply/sbs-battery.c b/drivers/power/supply/sbs-battery.c
index 048d205d7074..f8d74e9f7931 100644
--- a/drivers/power/supply/sbs-battery.c
+++ b/drivers/power/supply/sbs-battery.c
@@ -314,17 +314,22 @@ static int sbs_get_battery_presence_and_health(
 {
 	int ret;
 
-	if (psp == POWER_SUPPLY_PROP_PRESENT) {
-		/* Dummy command; if it succeeds, battery is present. */
-		ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
-		if (ret < 0)
-			val->intval = 0; /* battery disconnected */
-		else
-			val->intval = 1; /* battery present */
-	} else { /* POWER_SUPPLY_PROP_HEALTH */
+	/* Dummy command; if it succeeds, battery is present. */
+	ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
+
+	if (ret < 0) { /* battery not present*/
+		if (psp == POWER_SUPPLY_PROP_PRESENT) {
+			val->intval = 0;
+			return 0;
+		}
+		return ret;
+	}
+
+	if (psp == POWER_SUPPLY_PROP_PRESENT)
+		val->intval = 1; /* battery present */
+	else /* POWER_SUPPLY_PROP_HEALTH */
 		/* SBS spec doesn't have a general health command. */
 		val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
-	}
 
 	return 0;
 }
@@ -620,12 +625,14 @@ static int sbs_get_property(struct power_supply *psy,
 	switch (psp) {
 	case POWER_SUPPLY_PROP_PRESENT:
 	case POWER_SUPPLY_PROP_HEALTH:
-		if (client->flags & SBS_FLAGS_TI_BQ20Z75)
+		if (chip->flags & SBS_FLAGS_TI_BQ20Z75)
 			ret = sbs_get_ti_battery_presence_and_health(client,
 								     psp, val);
 		else
 			ret = sbs_get_battery_presence_and_health(client, psp,
 								  val);
+
+		/* this can only be true if no gpio is used */
 		if (psp == POWER_SUPPLY_PROP_PRESENT)
 			return 0;
 		break;
diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c
index 24895cc3b41e..bc8f5bda5762 100644
--- a/drivers/power/supply/sc27xx_fuel_gauge.c
+++ b/drivers/power/supply/sc27xx_fuel_gauge.c
@@ -109,6 +109,9 @@ struct sc27xx_fgu_data {
 };
 
 static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity);
+static void sc27xx_fgu_capacity_calibration(struct sc27xx_fgu_data *data,
+					    int cap, bool int_mode);
+static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap);
 
 static const char * const sc27xx_charger_supply_name[] = {
 	"sc2731_charger",
@@ -326,8 +329,6 @@ static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt)
 {
 	int ret;
 
-	clbcnt *= SC27XX_FGU_SAMPLE_HZ;
-
 	ret = regmap_update_bits(data->regmap,
 				 data->base + SC27XX_FGU_CLBCNT_SETL,
 				 SC27XX_FGU_CLBCNT_MASK, clbcnt);
@@ -362,7 +363,6 @@ static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt)
 
 	*clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK;
 	*clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT;
-	*clb_cnt /= SC27XX_FGU_SAMPLE_HZ;
 
 	return 0;
 }
@@ -380,10 +380,10 @@ static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap)
 
 	/*
 	 * Convert coulomb counter to delta capacity (mAh), and set multiplier
-	 * as 100 to improve the precision.
+	 * as 10 to improve the precision.
 	 */
-	temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360);
-	temp = sc27xx_fgu_adc_to_current(data, temp);
+	temp = DIV_ROUND_CLOSEST(delta_clbcnt * 10, 36 * SC27XX_FGU_SAMPLE_HZ);
+	temp = sc27xx_fgu_adc_to_current(data, temp / 1000);
 
 	/*
 	 * Convert to capacity percent of the battery total capacity,
@@ -392,6 +392,9 @@ static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap)
 	delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap);
 	*cap = delta_cap + data->init_cap;
 
+	/* Calibrate the battery capacity in a normal range. */
+	sc27xx_fgu_capacity_calibration(data, *cap, false);
+
 	return 0;
 }
 
@@ -587,6 +590,10 @@ static int sc27xx_fgu_get_property(struct power_supply *psy,
 		val->intval = value * 1000;
 		break;
 
+	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+		val->intval = data->total_cap * 1000;
+		break;
+
 	default:
 		ret = -EINVAL;
 		break;
@@ -604,17 +611,25 @@ static int sc27xx_fgu_set_property(struct power_supply *psy,
 	struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
 	int ret;
 
-	if (psp != POWER_SUPPLY_PROP_CAPACITY)
-		return -EINVAL;
-
 	mutex_lock(&data->lock);
 
-	ret = sc27xx_fgu_save_last_cap(data, val->intval);
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = sc27xx_fgu_save_last_cap(data, val->intval);
+		if (ret < 0)
+			dev_err(data->dev, "failed to save battery capacity\n");
+		break;
 
-	mutex_unlock(&data->lock);
+	case POWER_SUPPLY_PROP_CALIBRATE:
+		sc27xx_fgu_adjust_cap(data, val->intval);
+		ret = 0;
+		break;
 
-	if (ret < 0)
-		dev_err(data->dev, "failed to save battery capacity\n");
+	default:
+		ret = -EINVAL;
+	}
+
+	mutex_unlock(&data->lock);
 
 	return ret;
 }
@@ -629,7 +644,8 @@ static void sc27xx_fgu_external_power_changed(struct power_supply *psy)
 static int sc27xx_fgu_property_is_writeable(struct power_supply *psy,
 					    enum power_supply_property psp)
 {
-	return psp == POWER_SUPPLY_PROP_CAPACITY;
+	return psp == POWER_SUPPLY_PROP_CAPACITY ||
+		psp == POWER_SUPPLY_PROP_CALIBRATE;
 }
 
 static enum power_supply_property sc27xx_fgu_props[] = {
@@ -644,6 +660,8 @@ static enum power_supply_property sc27xx_fgu_props[] = {
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 	POWER_SUPPLY_PROP_CURRENT_AVG,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CALIBRATE,
 };
 
 static const struct power_supply_desc sc27xx_fgu_desc = {
@@ -659,50 +677,62 @@ static const struct power_supply_desc sc27xx_fgu_desc = {
 
 static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap)
 {
+	int ret;
+
 	data->init_cap = cap;
-	data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap);
+	ret = sc27xx_fgu_get_clbcnt(data, &data->init_clbcnt);
+	if (ret)
+		dev_err(data->dev, "failed to get init coulomb counter\n");
 }
 
-static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
+static void sc27xx_fgu_capacity_calibration(struct sc27xx_fgu_data *data,
+					    int cap, bool int_mode)
 {
-	struct sc27xx_fgu_data *data = dev_id;
-	int ret, cap, ocv, adc;
-	u32 status;
+	int ret, ocv, chg_sts, adc;
 
-	mutex_lock(&data->lock);
-
-	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_INT_STS,
-			  &status);
-	if (ret)
-		goto out;
+	ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
+	if (ret) {
+		dev_err(data->dev, "get battery ocv error.\n");
+		return;
+	}
 
-	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
-				 status, status);
-	if (ret)
-		goto out;
+	ret = sc27xx_fgu_get_status(data, &chg_sts);
+	if (ret) {
+		dev_err(data->dev, "get charger status error.\n");
+		return;
+	}
 
 	/*
-	 * When low overload voltage interrupt happens, we should calibrate the
-	 * battery capacity in lower voltage stage.
+	 * If we are in charging mode, then we do not need to calibrate the
+	 * lower capacity.
 	 */
-	if (!(status & SC27XX_FGU_LOW_OVERLOAD_INT))
-		goto out;
-
-	ret = sc27xx_fgu_get_capacity(data, &cap);
-	if (ret)
-		goto out;
+	if (chg_sts == POWER_SUPPLY_STATUS_CHARGING)
+		return;
 
-	ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
-	if (ret)
-		goto out;
-
-	/*
-	 * If current OCV value is less than the minimum OCV value in OCV table,
-	 * which means now battery capacity is 0%, and we should adjust the
-	 * inititial capacity to 0.
-	 */
-	if (ocv <= data->cap_table[data->table_len - 1].ocv) {
+	if ((ocv > data->cap_table[0].ocv && cap < 100) || cap > 100) {
+		/*
+		 * If current OCV value is larger than the max OCV value in
+		 * OCV table, or the current capacity is larger than 100,
+		 * we should force the inititial capacity to 100.
+		 */
+		sc27xx_fgu_adjust_cap(data, 100);
+	} else if (ocv <= data->cap_table[data->table_len - 1].ocv) {
+		/*
+		 * If current OCV value is leass than the minimum OCV value in
+		 * OCV table, we should force the inititial capacity to 0.
+		 */
 		sc27xx_fgu_adjust_cap(data, 0);
+	} else if ((ocv > data->cap_table[data->table_len - 1].ocv && cap <= 0) ||
+		   (ocv > data->min_volt && cap <= data->alarm_cap)) {
+		/*
+		 * If current OCV value is not matchable with current capacity,
+		 * we should re-calculate current capacity by looking up the
+		 * OCV table.
+		 */
+		int cur_cap = power_supply_ocv2cap_simple(data->cap_table,
+							  data->table_len, ocv);
+
+		sc27xx_fgu_adjust_cap(data, cur_cap);
 	} else if (ocv <= data->min_volt) {
 		/*
 		 * If current OCV value is less than the low alarm voltage, but
@@ -711,7 +741,7 @@ static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
 		 */
 		if (cap > data->alarm_cap) {
 			sc27xx_fgu_adjust_cap(data, data->alarm_cap);
-		} else if (cap <= 0) {
+		} else {
 			int cur_cap;
 
 			/*
@@ -726,15 +756,55 @@ static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
 			sc27xx_fgu_adjust_cap(data, cur_cap);
 		}
 
+		if (!int_mode)
+			return;
+
 		/*
 		 * After adjusting the battery capacity, we should set the
 		 * lowest alarm voltage instead.
 		 */
 		data->min_volt = data->cap_table[data->table_len - 1].ocv;
+		data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
+							      data->table_len,
+							      data->min_volt);
+
 		adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
-		regmap_update_bits(data->regmap, data->base + SC27XX_FGU_LOW_OVERLOAD,
+		regmap_update_bits(data->regmap,
+				   data->base + SC27XX_FGU_LOW_OVERLOAD,
 				   SC27XX_FGU_LOW_OVERLOAD_MASK, adc);
 	}
+}
+
+static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
+{
+	struct sc27xx_fgu_data *data = dev_id;
+	int ret, cap;
+	u32 status;
+
+	mutex_lock(&data->lock);
+
+	ret = regmap_read(data->regmap, data->base + SC27XX_FGU_INT_STS,
+			  &status);
+	if (ret)
+		goto out;
+
+	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
+				 status, status);
+	if (ret)
+		goto out;
+
+	/*
+	 * When low overload voltage interrupt happens, we should calibrate the
+	 * battery capacity in lower voltage stage.
+	 */
+	if (!(status & SC27XX_FGU_LOW_OVERLOAD_INT))
+		goto out;
+
+	ret = sc27xx_fgu_get_capacity(data, &cap);
+	if (ret)
+		goto out;
+
+	sc27xx_fgu_capacity_calibration(data, cap, true);
 
 out:
 	mutex_unlock(&data->lock);
@@ -785,7 +855,7 @@ static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity)
 	 * Convert current capacity (mAh) to coulomb counter according to the
 	 * formula: 1 mAh =3.6 coulomb.
 	 */
-	return DIV_ROUND_CLOSEST(cur_cap * 36 * data->cur_1000ma_adc, 10);
+	return DIV_ROUND_CLOSEST(cur_cap * 36 * data->cur_1000ma_adc * SC27XX_FGU_SAMPLE_HZ, 10);
 }
 
 static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data)
@@ -856,6 +926,8 @@ static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
 	data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
 						      data->table_len,
 						      data->min_volt);
+	if (!data->alarm_cap)
+		data->alarm_cap += 1;
 
 	power_supply_put_battery_info(data->battery, &info);
 
@@ -957,81 +1029,81 @@ disable_fgu:
 
 static int sc27xx_fgu_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
 	struct power_supply_config fgu_cfg = { };
 	struct sc27xx_fgu_data *data;
 	int ret, irq;
 
-	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	data->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	data->regmap = dev_get_regmap(dev->parent, NULL);
 	if (!data->regmap) {
-		dev_err(&pdev->dev, "failed to get regmap\n");
+		dev_err(dev, "failed to get regmap\n");
 		return -ENODEV;
 	}
 
-	ret = device_property_read_u32(&pdev->dev, "reg", &data->base);
+	ret = device_property_read_u32(dev, "reg", &data->base);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to get fgu address\n");
+		dev_err(dev, "failed to get fgu address\n");
 		return ret;
 	}
 
-	data->channel = devm_iio_channel_get(&pdev->dev, "bat-temp");
+	data->channel = devm_iio_channel_get(dev, "bat-temp");
 	if (IS_ERR(data->channel)) {
-		dev_err(&pdev->dev, "failed to get IIO channel\n");
+		dev_err(dev, "failed to get IIO channel\n");
 		return PTR_ERR(data->channel);
 	}
 
-	data->charge_chan = devm_iio_channel_get(&pdev->dev, "charge-vol");
+	data->charge_chan = devm_iio_channel_get(dev, "charge-vol");
 	if (IS_ERR(data->charge_chan)) {
-		dev_err(&pdev->dev, "failed to get charge IIO channel\n");
+		dev_err(dev, "failed to get charge IIO channel\n");
 		return PTR_ERR(data->charge_chan);
 	}
 
-	data->gpiod = devm_gpiod_get(&pdev->dev, "bat-detect", GPIOD_IN);
+	data->gpiod = devm_gpiod_get(dev, "bat-detect", GPIOD_IN);
 	if (IS_ERR(data->gpiod)) {
-		dev_err(&pdev->dev, "failed to get battery detection GPIO\n");
+		dev_err(dev, "failed to get battery detection GPIO\n");
 		return PTR_ERR(data->gpiod);
 	}
 
 	ret = gpiod_get_value_cansleep(data->gpiod);
 	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to get gpio state\n");
+		dev_err(dev, "failed to get gpio state\n");
 		return ret;
 	}
 
 	data->bat_present = !!ret;
 	mutex_init(&data->lock);
-	data->dev = &pdev->dev;
+	data->dev = dev;
 	platform_set_drvdata(pdev, data);
 
 	fgu_cfg.drv_data = data;
 	fgu_cfg.of_node = np;
-	data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc,
+	data->battery = devm_power_supply_register(dev, &sc27xx_fgu_desc,
 						   &fgu_cfg);
 	if (IS_ERR(data->battery)) {
-		dev_err(&pdev->dev, "failed to register power supply\n");
+		dev_err(dev, "failed to register power supply\n");
 		return PTR_ERR(data->battery);
 	}
 
 	ret = sc27xx_fgu_hw_init(data);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to initialize fgu hardware\n");
+		dev_err(dev, "failed to initialize fgu hardware\n");
 		return ret;
 	}
 
-	ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data);
+	ret = devm_add_action_or_reset(dev, sc27xx_fgu_disable, data);
 	if (ret) {
-		sc27xx_fgu_disable(data);
-		dev_err(&pdev->dev, "failed to add fgu disable action\n");
+		dev_err(dev, "failed to add fgu disable action\n");
 		return ret;
 	}
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "no irq resource specified\n");
+		dev_err(dev, "no irq resource specified\n");
 		return irq;
 	}
 
@@ -1046,17 +1118,17 @@ static int sc27xx_fgu_probe(struct platform_device *pdev)
 
 	irq = gpiod_to_irq(data->gpiod);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n");
+		dev_err(dev, "failed to translate GPIO to IRQ\n");
 		return irq;
 	}
 
-	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+	ret = devm_request_threaded_irq(dev, irq, NULL,
 					sc27xx_fgu_bat_detection,
 					IRQF_ONESHOT | IRQF_TRIGGER_RISING |
 					IRQF_TRIGGER_FALLING,
 					pdev->name, data);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to request IRQ\n");
+		dev_err(dev, "failed to request IRQ\n");
 		return ret;
 	}
 
@@ -1093,7 +1165,8 @@ static int sc27xx_fgu_suspend(struct device *dev)
 	 * If we are charging, then no need to enable the FGU interrupts to
 	 * adjust the battery capacity.
 	 */
-	if (status != POWER_SUPPLY_STATUS_NOT_CHARGING)
+	if (status != POWER_SUPPLY_STATUS_NOT_CHARGING &&
+	    status != POWER_SUPPLY_STATUS_DISCHARGING)
 		return 0;
 
 	ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,