[PATCH v2 0/7] power: act8945a_charger: Improvements

[PATCH v2 0/7] power: act8945a_charger: Improvements

[Wenyou Yang]

This patch series is used to improve the act8945a-charger, such as
improve the way to check the status, fix the power supply type
property, add the status change update, and add more properties:
capacity level property and max current property.

Changes in v2:
 - Add missing ret declaration.

Wenyou Yang (7):
  power: act8945a_charger: Remove "battery_temperature"
  power: act8945a_charger: Improve
  power: act8945a_charger: Add status change update support
  power: act8945a_charger: Fix the power supply type
  power: act8945a_charger: Add capacity level property
  power: act8945a_charger: Add max current property
  doc: bindings: act8945a-charger: Update properties

 .../devicetree/bindings/power/act8945a-charger.txt |   6 +-
 drivers/power/act8945a_charger.c                   | 371 ++++++++++++++++++---
 2 files changed, 337 insertions(+), 40 deletions(-)

-- 
2.7.4

[PATCH v2 1/7] power: act8945a_charger: Remove "battery_temperature"

[Wenyou Yang]

Remove "battery_temperature" member, it is redundant, it is the
hardware's responsibility to handle TH pin properly.
It is unnecessary to use the dt property to check if there is
a battery temperature monitor or not.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2: None

 drivers/power/act8945a_charger.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
index b5c00e4..72d39ba 100644
--- a/drivers/power/act8945a_charger.c
+++ b/drivers/power/act8945a_charger.c
@@ -76,7 +76,6 @@ static const char *act8945a_charger_manufacturer = "Active-semi";
 
 struct act8945a_charger {
 	struct regmap *regmap;
-	bool battery_temperature;
 };
 
 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -138,8 +137,7 @@ static int act8945a_get_charge_type(struct regmap *regmap, int *val)
 	return 0;
 }
 
-static int act8945a_get_battery_health(struct act8945a_charger *charger,
-				       struct regmap *regmap, int *val)
+static int act8945a_get_battery_health(struct regmap *regmap, int *val)
 {
 	int ret;
 	unsigned int status;
@@ -148,7 +146,7 @@ static int act8945a_get_battery_health(struct act8945a_charger *charger,
 	if (ret < 0)
 		return ret;
 
-	if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT))
+	if (status & APCH_STATUS_TEMPDAT)
 		*val = POWER_SUPPLY_HEALTH_OVERHEAT;
 	else if (!(status & APCH_STATUS_INDAT))
 		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
@@ -188,8 +186,7 @@ static int act8945a_charger_get_property(struct power_supply *psy,
 		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
-		ret = act8945a_get_battery_health(charger,
-						  regmap, &val->intval);
+		ret = act8945a_get_battery_health(regmap, &val->intval);
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = act8945a_charger_model;
@@ -235,9 +232,6 @@ static int act8945a_charger_config(struct device *dev,
 		return -EINVAL;
 	}
 
-	charger->battery_temperature = of_property_read_bool(np,
-				"active-semi,check-battery-temperature");
-
 	chglev_pin = of_get_named_gpio_flags(np,
 				"active-semi,chglev-gpios", 0, &flags);
 
-- 
2.7.4

[PATCH v2 2/7] power: act8945a_charger: Improve

[Wenyou Yang]

When get the property, first check the charger state machine,
then check the status bit to decide what value is assigned to
the corresponding property.

Retain the SUSCHG bit of REG 0x71 when configure the timers to
avoid losting the charger suspending info after boot.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2:
 - Add missing ret declaration.

 drivers/power/act8945a_charger.c | 86 ++++++++++++++++++++++++++++++++--------
 1 file changed, 69 insertions(+), 17 deletions(-)

diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
index 72d39ba..c680a40 100644
--- a/drivers/power/act8945a_charger.c
+++ b/drivers/power/act8945a_charger.c
@@ -94,17 +94,25 @@ static int act8945a_get_charger_state(struct regmap *regmap, int *val)
 	state &= APCH_STATE_CSTATE;
 	state >>= APCH_STATE_CSTATE_SHIFT;
 
-	if (state == APCH_STATE_CSTATE_EOC) {
+	switch (state) {
+	case APCH_STATE_CSTATE_PRE:
+	case APCH_STATE_CSTATE_FAST:
+		*val = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case APCH_STATE_CSTATE_EOC:
 		if (status & APCH_STATUS_CHGDAT)
 			*val = POWER_SUPPLY_STATUS_FULL;
 		else
+			*val = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case APCH_STATE_CSTATE_DISABLED:
+	default:
+		if (!(status & APCH_STATUS_INDAT))
+			*val = POWER_SUPPLY_STATUS_DISCHARGING;
+		else
 			*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
-	} else if ((state == APCH_STATE_CSTATE_FAST) ||
-		   (state == APCH_STATE_CSTATE_PRE)) {
-		*val = POWER_SUPPLY_STATUS_CHARGING;
-	} else {
-		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
-	}
+		break;
+	};
 
 	return 0;
 }
@@ -112,7 +120,11 @@ static int act8945a_get_charger_state(struct regmap *regmap, int *val)
 static int act8945a_get_charge_type(struct regmap *regmap, int *val)
 {
 	int ret;
-	unsigned int state;
+	unsigned int status, state;
+
+	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+	if (ret < 0)
+		return ret;
 
 	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
 	if (ret < 0)
@@ -129,9 +141,15 @@ static int act8945a_get_charge_type(struct regmap *regmap, int *val)
 		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
 		break;
 	case APCH_STATE_CSTATE_EOC:
+		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
+		break;
 	case APCH_STATE_CSTATE_DISABLED:
 	default:
-		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
+		if (!(status & APCH_STATUS_INDAT))
+			*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
+		else
+			*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
+		break;
 	}
 
 	return 0;
@@ -140,20 +158,45 @@ static int act8945a_get_charge_type(struct regmap *regmap, int *val)
 static int act8945a_get_battery_health(struct regmap *regmap, int *val)
 {
 	int ret;
-	unsigned int status;
+	unsigned int status, state, config;
 
 	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
 	if (ret < 0)
 		return ret;
 
-	if (status & APCH_STATUS_TEMPDAT)
-		*val = POWER_SUPPLY_HEALTH_OVERHEAT;
-	else if (!(status & APCH_STATUS_INDAT))
-		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
-	else if (status & APCH_STATUS_TIMRDAT)
-		*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
-	else
+	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+	if (ret < 0)
+		return ret;
+
+	state &= APCH_STATE_CSTATE;
+	state >>= APCH_STATE_CSTATE_SHIFT;
+
+	switch (state) {
+	case APCH_STATE_CSTATE_DISABLED:
+		if (config & APCH_CFG_SUSCHG) {
+			*val = POWER_SUPPLY_HEALTH_UNKNOWN;
+		} else if (status & APCH_STATUS_INDAT) {
+			if (!(status & APCH_STATUS_TEMPDAT))
+				*val = POWER_SUPPLY_HEALTH_OVERHEAT;
+			else if (status & APCH_STATUS_TIMRDAT)
+				*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
+			else
+				*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+		} else {
+			*val = POWER_SUPPLY_HEALTH_GOOD;
+		}
+		break;
+	case APCH_STATE_CSTATE_PRE:
+	case APCH_STATE_CSTATE_FAST:
+	case APCH_STATE_CSTATE_EOC:
+	default:
 		*val = POWER_SUPPLY_HEALTH_GOOD;
+		break;
+	}
 
 	return 0;
 }
@@ -224,7 +267,9 @@ static int act8945a_charger_config(struct device *dev,
 	u32 pre_time_out;
 	u32 input_voltage_threshold;
 	int chglev_pin;
+	int ret;
 
+	unsigned int tmp;
 	unsigned int value = 0;
 
 	if (!np) {
@@ -232,6 +277,13 @@ static int act8945a_charger_config(struct device *dev,
 		return -EINVAL;
 	}
 
+	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);
+	if (ret)
+		return ret;
+
+	if (tmp & APCH_CFG_SUSCHG)
+		value |= APCH_CFG_SUSCHG;
+
 	chglev_pin = of_get_named_gpio_flags(np,
 				"active-semi,chglev-gpios", 0, &flags);
 
-- 
2.7.4

[PATCH v2 3/7] power: act8945a_charger: Add status change update support

[Wenyou Yang]

Add the charger status change interrupt support, it will report
the power supply changed event.

This interrupt is generated by one of the conditions as below:
 - the state machine jumps out of or into the EOC state
 - the CHGIN input voltage goes out of or into the valid range.
 - the battery temperature goes out of or into the valid range.
 - the PRECHARGE time-out occurs.
 - the total charge time-out occurs.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2: None

 drivers/power/act8945a_charger.c | 78 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 72 insertions(+), 6 deletions(-)

diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
index c680a40..0c61b28 100644
--- a/drivers/power/act8945a_charger.c
+++ b/drivers/power/act8945a_charger.c
@@ -10,6 +10,7 @@
  * published by the Free Software Foundation.
  *
  */
+#include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
@@ -75,7 +76,12 @@ static const char *act8945a_charger_manufacturer = "Active-semi";
 #define APCH_STATE_CSTATE_PRE		0x03
 
 struct act8945a_charger {
+	struct power_supply *psy;
 	struct regmap *regmap;
+	struct work_struct work;
+
+	bool init_done;
+	int irq_pin;
 };
 
 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -252,6 +258,47 @@ static const struct power_supply_desc act8945a_charger_desc = {
 	.num_properties	= ARRAY_SIZE(act8945a_charger_props),
 };
 
+static int act8945a_enable_interrupt(struct act8945a_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	unsigned char ctrl;
+	int ret;
+
+	ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |
+	       APCH_CTRL_INDIS | APCH_CTRL_INCON |
+	       APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |
+	       APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;
+	ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
+	if (ret)
+		return ret;
+
+	ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |
+	       APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;
+	ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void act8945a_work(struct work_struct *work)
+{
+	struct act8945a_charger *charger =
+			container_of(work, struct act8945a_charger, work);
+
+	power_supply_changed(charger->psy);
+}
+
+static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
+{
+	struct act8945a_charger *charger = dev_id;
+
+	if (charger->init_done)
+		schedule_work(&charger->work);
+
+	return IRQ_HANDLED;
+}
+
 #define DEFAULT_TOTAL_TIME_OUT		3
 #define DEFAULT_PRE_TIME_OUT		40
 #define DEFAULT_INPUT_OVP_THRESHOLD	6600
@@ -283,6 +330,18 @@ static int act8945a_charger_config(struct device *dev,
 
 	if (tmp & APCH_CFG_SUSCHG)
 		value |= APCH_CFG_SUSCHG;
+	charger->irq_pin = of_get_named_gpio(np, "active-semi,irq_gpios", 0);
+	if (gpio_is_valid(charger->irq_pin)) {
+		if (!devm_gpio_request(dev, charger->irq_pin, "irq-pin")) {
+			ret = devm_request_irq(dev,
+					       gpio_to_irq(charger->irq_pin),
+					       act8945a_status_changed,
+					       IRQF_TRIGGER_FALLING,
+					       "irq-pin", charger);
+			if (ret)
+				dev_dbg(dev, "failed to request nIRQ pin IRQ\n");
+		}
+	}
 
 	chglev_pin = of_get_named_gpio_flags(np,
 				"active-semi,chglev-gpios", 0, &flags);
@@ -360,7 +419,6 @@ static int act8945a_charger_config(struct device *dev,
 static int act8945a_charger_probe(struct platform_device *pdev)
 {
 	struct act8945a_charger *charger;
-	struct power_supply *psy;
 	struct power_supply_config psy_cfg = {};
 	int ret;
 
@@ -381,14 +439,22 @@ static int act8945a_charger_probe(struct platform_device *pdev)
 	psy_cfg.of_node	= pdev->dev.parent->of_node;
 	psy_cfg.drv_data = charger;
 
-	psy = devm_power_supply_register(&pdev->dev,
-					 &act8945a_charger_desc,
-					 &psy_cfg);
-	if (IS_ERR(psy)) {
+	charger->psy = devm_power_supply_register(&pdev->dev,
+						  &act8945a_charger_desc,
+						  &psy_cfg);
+	if (IS_ERR(charger->psy)) {
 		dev_err(&pdev->dev, "failed to register power supply\n");
-		return PTR_ERR(psy);
+		return PTR_ERR(charger->psy);
 	}
 
+	INIT_WORK(&charger->work, act8945a_work);
+
+	ret = act8945a_enable_interrupt(charger);
+	if (ret)
+		return -EIO;
+
+	charger->init_done = true;
+
 	return 0;
 }
 
-- 
2.7.4

[PATCH v2 4/7] power: act8945a_charger: Fix the power supply type

[Wenyou Yang]

The power supply type property is varying as the external power
supply changes. It is not a constant.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2: None

 drivers/power/act8945a_charger.c | 48 ++++++++++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 9 deletions(-)

diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
index 0c61b28..be65e5d 100644
--- a/drivers/power/act8945a_charger.c
+++ b/drivers/power/act8945a_charger.c
@@ -77,6 +77,7 @@ static const char *act8945a_charger_manufacturer = "Active-semi";
 
 struct act8945a_charger {
 	struct power_supply *psy;
+	struct power_supply_desc desc;
 	struct regmap *regmap;
 	struct work_struct work;
 
@@ -250,14 +251,6 @@ static int act8945a_charger_get_property(struct power_supply *psy,
 	return ret;
 }
 
-static const struct power_supply_desc act8945a_charger_desc = {
-	.name		= "act8945a-charger",
-	.type		= POWER_SUPPLY_TYPE_BATTERY,
-	.get_property	= act8945a_charger_get_property,
-	.properties	= act8945a_charger_props,
-	.num_properties	= ARRAY_SIZE(act8945a_charger_props),
-};
-
 static int act8945a_enable_interrupt(struct act8945a_charger *charger)
 {
 	struct regmap *regmap = charger->regmap;
@@ -281,11 +274,39 @@ static int act8945a_enable_interrupt(struct act8945a_charger *charger)
 	return 0;
 }
 
+static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,
+					     unsigned int *type)
+{
+	unsigned int status, state;
+	int ret;
+
+	ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);
+	if (ret < 0)
+		return ret;
+
+	if (status & APCH_STATUS_INDAT) {
+		if (state & APCH_STATE_ACINSTAT)
+			*type = POWER_SUPPLY_TYPE_MAINS;
+		else
+			*type = POWER_SUPPLY_TYPE_USB;
+	} else {
+		*type = POWER_SUPPLY_TYPE_BATTERY;
+	}
+
+	return 0;
+}
+
 static void act8945a_work(struct work_struct *work)
 {
 	struct act8945a_charger *charger =
 			container_of(work, struct act8945a_charger, work);
 
+	act8945a_set_supply_type(charger, &charger->desc.type);
+
 	power_supply_changed(charger->psy);
 }
 
@@ -436,11 +457,20 @@ static int act8945a_charger_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	charger->desc.name = "act8945a-charger";
+	charger->desc.get_property = act8945a_charger_get_property;
+	charger->desc.properties = act8945a_charger_props;
+	charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);
+
+	ret = act8945a_set_supply_type(charger, &charger->desc.type);
+	if (ret)
+		return -EINVAL;
+
 	psy_cfg.of_node	= pdev->dev.parent->of_node;
 	psy_cfg.drv_data = charger;
 
 	charger->psy = devm_power_supply_register(&pdev->dev,
-						  &act8945a_charger_desc,
+						  &charger->desc,
 						  &psy_cfg);
 	if (IS_ERR(charger->psy)) {
 		dev_err(&pdev->dev, "failed to register power supply\n");
-- 
2.7.4

[PATCH v2 5/7] power: act8945a_charger: Add capacity level property

[Wenyou Yang]

Add the power supply capacity level property, it corresponds to
POWER_SUPPLY_CAPACITY_LEVEL_*.

It also utilizes the precision voltage detector function module
to catch the low battery voltage.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2: None

 drivers/power/act8945a_charger.c | 78 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
index be65e5d..9b79f5e 100644
--- a/drivers/power/act8945a_charger.c
+++ b/drivers/power/act8945a_charger.c
@@ -83,6 +83,7 @@ struct act8945a_charger {
 
 	bool init_done;
 	int irq_pin;
+	int lbo_pin;
 };
 
 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -208,11 +209,70 @@ static int act8945a_get_battery_health(struct regmap *regmap, int *val)
 	return 0;
 }
 
+static int act8945a_get_capacity_level(struct act8945a_charger *charger,
+				       struct regmap *regmap, int *val)
+{
+	int ret;
+	unsigned int status, state, config;
+	int lbo_level = 1;
+
+	if (gpio_is_valid(charger->lbo_pin))
+		lbo_level = gpio_get_value(charger->lbo_pin);
+
+	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+	if (ret < 0)
+		return ret;
+
+	state &= APCH_STATE_CSTATE;
+	state >>= APCH_STATE_CSTATE_SHIFT;
+
+	switch (state) {
+	case APCH_STATE_CSTATE_PRE:
+		*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+		break;
+	case APCH_STATE_CSTATE_FAST:
+		if (lbo_level)
+			*val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
+		else
+			*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+		break;
+	case APCH_STATE_CSTATE_EOC:
+		if (status & APCH_STATUS_CHGDAT)
+			*val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+		else
+			*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+		break;
+	case APCH_STATE_CSTATE_DISABLED:
+	default:
+		if (config & APCH_CFG_SUSCHG) {
+			*val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+		} else {
+			*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+			if (!(status & APCH_STATUS_INDAT)) {
+				if (!lbo_level)
+					*val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+			}
+		}
+		break;
+	}
+
+	return 0;
+}
+
 static enum power_supply_property act8945a_charger_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_CHARGE_TYPE,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER
 };
@@ -238,6 +298,10 @@ static int act8945a_charger_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_HEALTH:
 		ret = act8945a_get_battery_health(regmap, &val->intval);
 		break;
+	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+		ret = act8945a_get_capacity_level(charger,
+						  regmap, &val->intval);
+		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = act8945a_charger_model;
 		break;
@@ -364,6 +428,20 @@ static int act8945a_charger_config(struct device *dev,
 		}
 	}
 
+	charger->lbo_pin = of_get_named_gpio(np, "active-semi,lbo-gpios", 0);
+	if (gpio_is_valid(charger->lbo_pin)) {
+		if (!devm_gpio_request(dev, charger->lbo_pin, "lbo-detect")) {
+			ret = devm_request_irq(dev,
+					       gpio_to_irq(charger->lbo_pin),
+					       act8945a_status_changed,
+					       IRQF_TRIGGER_FALLING |
+					       IRQF_TRIGGER_RISING,
+					       "lbo-detect", charger);
+			if (ret)
+				dev_dbg(dev, "failed to request LBO pin IRQ\n");
+		}
+	}
+
 	chglev_pin = of_get_named_gpio_flags(np,
 				"active-semi,chglev-gpios", 0, &flags);
 
-- 
2.7.4

[PATCH v2 6/7] power: act8945a_charger: Add max current property

[Wenyou Yang]

Add the power supply's current max property,
POWER_SUPPLY_PROP_CURRENT_MAX.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2: None

 drivers/power/act8945a_charger.c | 79 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 77 insertions(+), 2 deletions(-)

diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
index 9b79f5e..8d99bff 100644
--- a/drivers/power/act8945a_charger.c
+++ b/drivers/power/act8945a_charger.c
@@ -84,6 +84,7 @@ struct act8945a_charger {
 	bool init_done;
 	int irq_pin;
 	int lbo_pin;
+	int chgin_level;
 };
 
 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -267,12 +268,79 @@ static int act8945a_get_capacity_level(struct act8945a_charger *charger,
 	return 0;
 }
 
+#define MAX_CURRENT_USB_HIGH	450000
+#define MAX_CURRENT_USB_LOW	90000
+#define MAX_CURRENT_USB_PRE	45000
+/*
+ * Riset(K) = 2336 * (1V/Ichg(mA)) - 0.205
+ * Riset = 2.43K
+ */
+#define MAX_CURRENT_AC_HIGH		886527
+#define MAX_CURRENT_AC_LOW		117305
+#define MAX_CURRENT_AC_HIGH_PRE		88653
+#define MAX_CURRENT_AC_LOW_PRE		11731
+
+static int act8945a_get_current_max(struct act8945a_charger *charger,
+				    struct regmap *regmap, int *val)
+{
+	int ret;
+	unsigned int status, state;
+	unsigned int acin_state;
+
+	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+	if (ret < 0)
+		return ret;
+
+	acin_state = (state & APCH_STATE_ACINSTAT) >> 1;
+
+	state &= APCH_STATE_CSTATE;
+	state >>= APCH_STATE_CSTATE_SHIFT;
+
+	switch (state) {
+	case APCH_STATE_CSTATE_PRE:
+		if (acin_state) {
+			if (charger->chgin_level)
+				*val = MAX_CURRENT_AC_HIGH_PRE;
+			else
+				*val = MAX_CURRENT_AC_LOW_PRE;
+		} else {
+			*val = MAX_CURRENT_USB_PRE;
+		}
+		break;
+	case APCH_STATE_CSTATE_FAST:
+		if (acin_state) {
+			if (charger->chgin_level)
+				*val = MAX_CURRENT_AC_HIGH;
+			else
+				*val = MAX_CURRENT_AC_LOW;
+		} else {
+			if (charger->chgin_level)
+				*val = MAX_CURRENT_USB_HIGH;
+			else
+				*val = MAX_CURRENT_USB_LOW;
+		}
+		break;
+	case APCH_STATE_CSTATE_EOC:
+	case APCH_STATE_CSTATE_DISABLED:
+	default:
+		*val = 0;
+		break;
+	}
+
+	return 0;
+}
+
 static enum power_supply_property act8945a_charger_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_CHARGE_TYPE,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER
 };
@@ -302,6 +370,10 @@ static int act8945a_charger_get_property(struct power_supply *psy,
 		ret = act8945a_get_capacity_level(charger,
 						  regmap, &val->intval);
 		break;
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		ret = act8945a_get_current_max(charger,
+					       regmap, &val->intval);
+		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = act8945a_charger_model;
 		break;
@@ -446,8 +518,11 @@ static int act8945a_charger_config(struct device *dev,
 				"active-semi,chglev-gpios", 0, &flags);
 
 	if (gpio_is_valid(chglev_pin)) {
-		gpio_set_value(chglev_pin,
-			       ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
+		if (!devm_gpio_request(dev, charger->irq_pin, "chglev-pin")) {
+			charger->chgin_level =
+					(flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1;
+			gpio_set_value(chglev_pin, charger->chgin_level);
+		}
 	}
 
 	if (of_property_read_u32(np,
-- 
2.7.4

[PATCH v2 7/7] doc: bindings: act8945a-charger: Update properties

[Wenyou Yang]

Due the driver improvements, update the properties,
 - Remove "active-semi,check-battery-temperature" property.
 - Add the properties, "active-semi,irq_gpio"
   and "active-semi,lbo-gpios".

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

Changes in v2: None

 Documentation/devicetree/bindings/power/act8945a-charger.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/power/act8945a-charger.txt b/Documentation/devicetree/bindings/power/act8945a-charger.txt
index bea254c..d7cf05b 100644
--- a/Documentation/devicetree/bindings/power/act8945a-charger.txt
+++ b/Documentation/devicetree/bindings/power/act8945a-charger.txt
@@ -4,10 +4,12 @@ Required properties:
  - compatible: "active-semi,act8945a", please refer to ../mfd/act8945a.txt.
  - active-semi,chglev-gpios: charge current level phandle with args
    as described in ../gpio/gpio.txt.
+ - active-semi,irq_gpios: specify the charger interrupt input phanle
+   with args as as described in ../gpio/gpio.txt.
+ - active-semi,lbo-gpios: specify the low battery voltage detect phandle
+   with args as as described in ../gpio/gpio.txt.
 
 Optional properties:
- - active-semi,check-battery-temperature: boolean to check the battery
-   temperature or not.
  - active-semi,input-voltage-threshold-microvolt: unit: mV;
    Specifies the charger's input over-voltage threshold value;
    The value can be: 6600, 7000, 7500, 8000; default: 6600
-- 
2.7.4

Re: [PATCH v2 7/7] doc: bindings: act8945a-charger: Update properties

[Rob Herring]

On Tue, Jun 28, 2016 at 09:22:50AM +0800, Wenyou Yang wrote:
> Due the driver improvements, update the properties,
>  - Remove "active-semi,check-battery-temperature" property.
>  - Add the properties, "active-semi,irq_gpio"
>    and "active-semi,lbo-gpios".
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
> ---
> 
> Changes in v2: None
> 
>  Documentation/devicetree/bindings/power/act8945a-charger.txt | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/power/act8945a-charger.txt b/Documentation/devicetree/bindings/power/act8945a-charger.txt
> index bea254c..d7cf05b 100644
> --- a/Documentation/devicetree/bindings/power/act8945a-charger.txt
> +++ b/Documentation/devicetree/bindings/power/act8945a-charger.txt
> @@ -4,10 +4,12 @@ Required properties:
>   - compatible: "active-semi,act8945a", please refer to ../mfd/act8945a.txt.
>   - active-semi,chglev-gpios: charge current level phandle with args
>     as described in ../gpio/gpio.txt.
> + - active-semi,irq_gpios: specify the charger interrupt input phanle
> +   with args as as described in ../gpio/gpio.txt.

Use "interrupts" property instead.

> + - active-semi,lbo-gpios: specify the low battery voltage detect phandle
> +   with args as as described in ../gpio/gpio.txt.
>  
>  Optional properties:
> - - active-semi,check-battery-temperature: boolean to check the battery
> -   temperature or not.
>   - active-semi,input-voltage-threshold-microvolt: unit: mV;
>     Specifies the charger's input over-voltage threshold value;
>     The value can be: 6600, 7000, 7500, 8000; default: 6600
> -- 
> 2.7.4
> 

RE: [PATCH v2 0/7] power: act8945a_charger: Improvements

[Yang, Wenyou]

Hello everyone

Do you have any comments for this patch set?

Best Regards,
Wenyou Yang
________________________________________
From: Wenyou Yang [wenyou.yang@atmel.com]
Sent: Tuesday, June 28, 2016 9:22
To: Sebastian Reichel; Dmitry Eremin-Solenikov; David Woodhouse; Rob Herring; Pawel Moll; Mark Brown; Ian Campbell; Kumar Gala
Cc: linux-kernel@vger.kernel.org; devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; Ferre, Nicolas; linux-pm@vger.kernel.org; Yang, Wenyou
Subject: [PATCH v2 0/7] power: act8945a_charger: Improvements

This patch series is used to improve the act8945a-charger, such as
improve the way to check the status, fix the power supply type
property, add the status change update, and add more properties:
capacity level property and max current property.

Changes in v2:
 - Add missing ret declaration.

Wenyou Yang (7):
  power: act8945a_charger: Remove "battery_temperature"
  power: act8945a_charger: Improve
  power: act8945a_charger: Add status change update support
  power: act8945a_charger: Fix the power supply type
  power: act8945a_charger: Add capacity level property
  power: act8945a_charger: Add max current property
  doc: bindings: act8945a-charger: Update properties

 .../devicetree/bindings/power/act8945a-charger.txt |   6 +-
 drivers/power/act8945a_charger.c                   | 371 ++++++++++++++++++---
 2 files changed, 337 insertions(+), 40 deletions(-)

--
2.7.4