[PATCH v5 0/7] power: act8945a_charger: Improvements

[PATCH v5 0/7] power: act8945a_charger: Improvements

[Wenyou Yang]

This patch series is to improve the implementation of act8945a-charger
driver, 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 v5:
 - Add Acked-by tag.

Changes in v4:
 - Use "interrupts" property, instead of "active-semi,lbo-gpios"
   for irq.
 - Change devname of devm_request_irq() from "lbo-detect" to
   "act8945a, lbo-detect".
 - Fix wrong gpio assignment for chglev_pin.
 - Update the doc/binding for using "interrupts" property.

Changes in v3:
 - Remove unneeded semicolon to fix semicolon.cocci warning.

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

 .../bindings/power/supply/act8945a-charger.txt     |  16 +-
 drivers/power/supply/act8945a_charger.c            | 373 ++++++++++++++++++---
 2 files changed, 348 insertions(+), 41 deletions(-)

-- 
2.7.4

[PATCH v5 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 v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

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

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index b5c00e4..72d39ba 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/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 v5 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>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3:
 - Remove unneeded semicolon to fix semicolon.cocci warning.

Changes in v2:
 - Add missing ret declaration.

 drivers/power/supply/act8945a_charger.c | 84 ++++++++++++++++++++++++++-------
 1 file changed, 68 insertions(+), 16 deletions(-)

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index 72d39ba..6ddfc1d 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -94,16 +94,24 @@ 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 v5 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 v5: None
Changes in v4:
 - Use "interrupts" property, instead of "active-semi,lbo-gpios"
   for irq.

Changes in v3: None
Changes in v2: None

 drivers/power/supply/act8945a_charger.c | 82 ++++++++++++++++++++++++++++++---
 1 file changed, 75 insertions(+), 7 deletions(-)

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index 6ddfc1d..74778f7 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -10,9 +10,11 @@
  * published by the Free Software Foundation.
  *
  */
+#include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
+#include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
@@ -75,7 +77,11 @@ 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;
 };
 
 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
@@ -360,9 +407,8 @@ 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;
+	int irq, ret;
 
 	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
 	if (!charger)
@@ -378,17 +424,39 @@ static int act8945a_charger_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	irq = of_irq_get(pdev->dev.parent->of_node, 0);
+	if (irq == -EPROBE_DEFER) {
+		dev_err(&pdev->dev, "failed to find IRQ number\n");
+		return -EPROBE_DEFER;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
+			       IRQF_TRIGGER_FALLING, "act8945a_interrupt",
+			       charger);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
+		return ret;
+	}
+
 	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 v5 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 v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

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

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index 74778f7..a3d89be 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -78,6 +78,7 @@ 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);
 }
 
@@ -438,11 +459,20 @@ static int act8945a_charger_probe(struct platform_device *pdev)
 		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 v5 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 v5: None
Changes in v4:
 - Change devname of devm_request_irq() from "lbo-detect" to
   "act8945a, lbo-detect".

Changes in v3: None
Changes in v2: None

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

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index a3d89be..2321796 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -83,6 +83,7 @@ struct act8945a_charger {
 	struct work_struct work;
 
 	bool init_done;
+	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;
@@ -352,6 +416,20 @@ static int act8945a_charger_config(struct device *dev,
 	if (tmp & APCH_CFG_SUSCHG)
 		value |= APCH_CFG_SUSCHG;
 
+	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,
+					       "act8945a, 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 v5 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 v5: None
Changes in v4:
 - Fix wrong gpio assignment for chglev_pin.

Changes in v3: None
Changes in v2: None

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

diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index 2321796..9bfbc87 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -84,6 +84,7 @@ struct act8945a_charger {
 
 	bool init_done;
 	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;
@@ -434,8 +506,11 @@ 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, chglev_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 v5 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>
Acked-by: Rob Herring <robh@kernel.org>
---

Changes in v5:
 - Add Acked-by tag.

Changes in v4:
 - Update the doc/binding for using "interrupts" property.

Changes in v3: None
Changes in v2: None

 .../bindings/power/supply/act8945a-charger.txt           | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/power/supply/act8945a-charger.txt b/Documentation/devicetree/bindings/power/supply/act8945a-charger.txt
index bea254c..f9866c4 100644
--- a/Documentation/devicetree/bindings/power/supply/act8945a-charger.txt
+++ b/Documentation/devicetree/bindings/power/supply/act8945a-charger.txt
@@ -4,10 +4,15 @@ 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,lbo-gpios: specify the low battery voltage detect phandle
+   with args as as described in ../gpio/gpio.txt.
+ - interrupts: <a b> where a is the interrupt number and b is a
+   field that represents an encoding of the sense and level
+   information for the interrupt.
+ - interrupt-parent: the phandle for the interrupt controller that
+   services interrupts for this device.
 
 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
@@ -27,9 +32,14 @@ Example:
 		status = "okay";
 
 		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_charger_chglev>;
+		pinctrl-0 = <&pinctrl_charger_chglev &pinctrl_charger_lbo &pinctrl_charger_irq>;
+
 		active-semi,chglev-gpios = <&pioA 12 GPIO_ACTIVE_HIGH>;
+		active-semi,lbo-gpios = <&pioA 72 GPIO_ACTIVE_LOW>;
 		active-semi,input-voltage-threshold-microvolt = <6600>;
 		active-semi,precondition-timeout = <40>;
 		active-semi,total-timeout = <3>;
+		interrupt-parent = <&pioA>;
+		interrupts = <45 GPIO_ACTIVE_LOW>;
+
 	};
-- 
2.7.4

Re: [PATCH v5 1/7] power: act8945a_charger: Remove "battery_temperature"

[Sebastian Reichel]

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Hi,

On Tue, Aug 16, 2016 at 04:59:52PM +0800, Wenyou Yang wrote:
> [...]
>
> -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)

This incorrectly inverts the logic.

>  		*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);

-- Sebastian

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Re: [PATCH v5 3/7] power: act8945a_charger: Add status change update support

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 5224 bytes --]

Hi,

On Tue, Aug 16, 2016 at 04:59:54PM +0800, Wenyou Yang wrote:
> 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.

This is unsafe during module remove, since irq work may be scheduled
while power-supply is unregistered. You will have to add a remove
function, which does something like

charger->init_done = false;
cancel_work_sync(&charger->work);

-- Sebastian

> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
> ---
> 
> Changes in v5: None
> Changes in v4:
>  - Use "interrupts" property, instead of "active-semi,lbo-gpios"
>    for irq.
> 
> Changes in v3: None
> Changes in v2: None
> 
>  drivers/power/supply/act8945a_charger.c | 82 ++++++++++++++++++++++++++++++---
>  1 file changed, 75 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
> index 6ddfc1d..74778f7 100644
> --- a/drivers/power/supply/act8945a_charger.c
> +++ b/drivers/power/supply/act8945a_charger.c
> @@ -10,9 +10,11 @@
>   * published by the Free Software Foundation.
>   *
>   */
> +#include <linux/interrupt.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_gpio.h>
> +#include <linux/of_irq.h>
>  #include <linux/platform_device.h>
>  #include <linux/power_supply.h>
>  #include <linux/regmap.h>
> @@ -75,7 +77,11 @@ 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;
>  };
>  
>  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
> @@ -360,9 +407,8 @@ 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;
> +	int irq, ret;
>  
>  	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
>  	if (!charger)
> @@ -378,17 +424,39 @@ static int act8945a_charger_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> +	irq = of_irq_get(pdev->dev.parent->of_node, 0);
> +	if (irq == -EPROBE_DEFER) {
> +		dev_err(&pdev->dev, "failed to find IRQ number\n");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
> +			       IRQF_TRIGGER_FALLING, "act8945a_interrupt",
> +			       charger);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
> +		return ret;
> +	}
> +
>  	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
> 

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Re: [PATCH v5 5/7] power: act8945a_charger: Add capacity level property

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 343 bytes --]

Hi,

On Tue, Aug 16, 2016 at 04:59:56PM +0800, Wenyou Yang wrote:
> 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.

Please use gpiod API instead of old gpio API.

-- Sebastian

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Re: [PATCH v5 6/7] power: act8945a_charger: Add max current property

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 206 bytes --]

Hi,

On Tue, Aug 16, 2016 at 04:59:57PM +0800, Wenyou Yang wrote:
> Add the power supply's current max property,
> POWER_SUPPLY_PROP_CURRENT_MAX.

Please also switch chgin_level to gpiod API.

-- Sebastian

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