bq20z75: Add support for charge properties

Adding support for charge properties for gas gauge.

Also ensuring that battery mode is correct now for energy as well as
charge properties by setting it on the fly.

I also added 2 functions to power_supply.h to help identify the units for
specific properties more easily by power supplies.
Signed-off-by: NRhyland Klein <rklein@nvidia.com>
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>

drivers/power/bq20z75.c

@@ -38,11 +38,22 @@ enum {
 	REG_CYCLE_COUNT,
 	REG_SERIAL_NUMBER,
 	REG_REMAINING_CAPACITY,
+	REG_REMAINING_CAPACITY_CHARGE,
 	REG_FULL_CHARGE_CAPACITY,
+	REG_FULL_CHARGE_CAPACITY_CHARGE,
 	REG_DESIGN_CAPACITY,
+	REG_DESIGN_CAPACITY_CHARGE,
 	REG_DESIGN_VOLTAGE,
 };
 
+/* Battery Mode defines */
+#define BATTERY_MODE_OFFSET		0x03
+#define BATTERY_MODE_MASK		0x8000
+enum bq20z75_battery_mode {
+	BATTERY_MODE_AMPS,
+	BATTERY_MODE_WATTS
+};
+
 /* manufacturer access defines */
 #define MANUFACTURER_ACCESS_STATUS	0x0006
 #define MANUFACTURER_ACCESS_SLEEP	0x0011
@@ -78,8 +89,12 @@ static const struct bq20z75_device_data {
 		BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
 	[REG_REMAINING_CAPACITY] =
 		BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
+	[REG_REMAINING_CAPACITY_CHARGE] =
+		BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
 	[REG_FULL_CHARGE_CAPACITY] =
 		BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
+	[REG_FULL_CHARGE_CAPACITY_CHARGE] =
+		BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
 	[REG_TIME_TO_EMPTY] =
 		BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
 			65535),
@@ -93,6 +108,9 @@ static const struct bq20z75_device_data {
 	[REG_DESIGN_CAPACITY] =
 		BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
 			65535),
+	[REG_DESIGN_CAPACITY_CHARGE] =
+		BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
+			65535),
 	[REG_DESIGN_VOLTAGE] =
 		BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
 			65535),
@@ -117,6 +135,9 @@ static enum power_supply_property bq20z75_properties[] = {
 	POWER_SUPPLY_PROP_ENERGY_NOW,
 	POWER_SUPPLY_PROP_ENERGY_FULL,
 	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 };
 
 struct bq20z75_info {
@@ -260,6 +281,9 @@ static void  bq20z75_unit_adjustment(struct i2c_client *client,
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+	case POWER_SUPPLY_PROP_CHARGE_FULL:
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 		val->intval *= BASE_UNIT_CONVERSION;
 		break;
 
@@ -281,11 +305,44 @@ static void  bq20z75_unit_adjustment(struct i2c_client *client,
 	}
 }
 
+static enum bq20z75_battery_mode
+bq20z75_set_battery_mode(struct i2c_client *client,
+	enum bq20z75_battery_mode mode)
+{
+	int ret, original_val;
+
+	original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
+	if (original_val < 0)
+		return original_val;
+
+	if ((original_val & BATTERY_MODE_MASK) == mode)
+		return mode;
+
+	if (mode == BATTERY_MODE_AMPS)
+		ret = original_val & ~BATTERY_MODE_MASK;
+	else
+		ret = original_val | BATTERY_MODE_MASK;
+
+	ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
+	if (ret < 0)
+		return ret;
+
+	return original_val & BATTERY_MODE_MASK;
+}
+
 static int bq20z75_get_battery_capacity(struct i2c_client *client,
 	int reg_offset, enum power_supply_property psp,
 	union power_supply_propval *val)
 {
 	s32 ret;
+	enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
+
+	if (power_supply_is_amp_property(psp))
+		mode = BATTERY_MODE_AMPS;
+
+	mode = bq20z75_set_battery_mode(client, mode);
+	if (mode < 0)
+		return mode;
 
 	ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
 	if (ret < 0)
@@ -298,6 +355,10 @@ static int bq20z75_get_battery_capacity(struct i2c_client *client,
 	} else
 		val->intval = ret;
 
+	ret = bq20z75_set_battery_mode(client, mode);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }
 
@@ -318,11 +379,25 @@ static int bq20z75_get_battery_serial_number(struct i2c_client *client,
 	return 0;
 }
 
+static int bq20z75_get_property_index(struct i2c_client *client,
+	enum power_supply_property psp)
+{
+	int count;
+	for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
+		if (psp == bq20z75_data[count].psp)
+			return count;
+
+	dev_warn(&client->dev,
+		"%s: Invalid Property - %d\n", __func__, psp);
+
+	return -EINVAL;
+}
+
 static int bq20z75_get_property(struct power_supply *psy,
 	enum power_supply_property psp,
 	union power_supply_propval *val)
 {
-	int count;
+	int ps_index;
 	int ret;
 	struct bq20z75_info *bq20z75_device = container_of(psy,
 				struct bq20z75_info, power_supply);
@@ -343,13 +418,15 @@ static int bq20z75_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_ENERGY_NOW:
 	case POWER_SUPPLY_PROP_ENERGY_FULL:
 	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+	case POWER_SUPPLY_PROP_CHARGE_FULL:
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 	case POWER_SUPPLY_PROP_CAPACITY:
-		for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) {
-			if (psp == bq20z75_data[count].psp)
-				break;
-		}
+		ps_index = bq20z75_get_property_index(client, psp);
+		if (ps_index < 0)
+			return ps_index;
 
-		ret = bq20z75_get_battery_capacity(client, count, psp, val);
+		ret = bq20z75_get_battery_capacity(client, ps_index, psp, val);
 		if (ret)
 			return ret;
 
@@ -369,12 +446,11 @@ static int bq20z75_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 	case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
-		for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) {
-			if (psp == bq20z75_data[count].psp)
-				break;
-		}
+		ps_index = bq20z75_get_property_index(client, psp);
+		if (ps_index < 0)
+			return ps_index;
 
-		ret = bq20z75_get_battery_property(client, count, psp, val);
+		ret = bq20z75_get_battery_property(client, ps_index, psp, val);
 		if (ret)
 			return ret;
 

include/linux/power_supply.h

@@ -213,4 +213,48 @@ extern void power_supply_unregister(struct power_supply *psy);
 /* For APM emulation, think legacy userspace. */
 extern struct class *power_supply_class;
 
+static inline bool power_supply_is_amp_property(enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
+	case POWER_SUPPLY_PROP_CHARGE_FULL:
+	case POWER_SUPPLY_PROP_CHARGE_EMPTY:
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+	case POWER_SUPPLY_PROP_CHARGE_AVG:
+	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		return 1;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static inline bool power_supply_is_watt_property(enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+	case POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN:
+	case POWER_SUPPLY_PROP_ENERGY_FULL:
+	case POWER_SUPPLY_PROP_ENERGY_EMPTY:
+	case POWER_SUPPLY_PROP_ENERGY_NOW:
+	case POWER_SUPPLY_PROP_ENERGY_AVG:
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		return 1;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
 #endif /* __LINUX_POWER_SUPPLY_H__ */