power: supply: bd71828: add input current limit property

Add input current property to be able to work around issues created by
automatic input limiting and have some control.
Disabling the automatic management is another step.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Link: https://patch.msgid.link/20260401-bd-inp-limit-v1-1-689eb22531e2@kemnade.info
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: akemnade

drivers/power/supply/bd71828-power.c

@@ -24,6 +24,7 @@
 #define BD7182x_MASK_CONF_PON			BIT(0)
 #define BD71815_MASK_CONF_XSTB			BIT(1)
 #define BD7182x_MASK_BAT_STAT			0x3f
+#define BD7182x_MASK_ILIM			0x3f
 #define BD7182x_MASK_DCIN_STAT			0x07
 
 #define BD7182x_MASK_WDT_AUTO			0x40
@@ -48,9 +49,11 @@ struct pwr_regs {
 	unsigned int vbat_avg;
 	unsigned int ibat;
 	unsigned int ibat_avg;
+	unsigned int ilim_stat;
 	unsigned int btemp_vth;
 	unsigned int chg_state;
 	unsigned int bat_temp;
+	unsigned int dcin_set;
 	unsigned int dcin_stat;
 	unsigned int dcin_online_mask;
 	unsigned int dcin_collapse_limit;
@@ -66,9 +69,11 @@ static const struct pwr_regs pwr_regs_bd71828 = {
 	.vbat_avg = BD71828_REG_VBAT_U,
 	.ibat = BD71828_REG_IBAT_U,
 	.ibat_avg = BD71828_REG_IBAT_AVG_U,
+	.ilim_stat = BD71828_REG_ILIM_STAT,
 	.btemp_vth = BD71828_REG_VM_BTMP_U,
 	.chg_state = BD71828_REG_CHG_STATE,
 	.bat_temp = BD71828_REG_BAT_TEMP,
+	.dcin_set = BD71828_REG_DCIN_SET,
 	.dcin_stat = BD71828_REG_DCIN_STAT,
 	.dcin_online_mask = BD7182x_MASK_DCIN_DET,
 	.dcin_collapse_limit = BD71828_REG_DCIN_CLPS,
@@ -441,6 +446,7 @@ static int bd71828_charger_get_property(struct power_supply *psy,
 	struct bd71828_power *pwr = dev_get_drvdata(psy->dev.parent);
 	u32 vot;
 	u16 tmp;
+	int t;
 	int online;
 	int ret;
 
@@ -459,6 +465,20 @@ static int bd71828_charger_get_property(struct power_supply *psy,
 		vot = tmp;
 		/* 5 milli volt steps */
 		val->intval = 5000 * vot;
+		break;
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		if (!pwr->regs->ilim_stat)
+			return -ENODATA;
+
+		ret = regmap_read(pwr->regmap, pwr->regs->ilim_stat, &t);
+		if (ret)
+			return ret;
+
+		t++;
+		val->intval = (t & BD7182x_MASK_ILIM) * 50000;
+		if (val->intval > 2000000)
+			val->intval = 2000000;
+
 		break;
 	default:
 		return -EINVAL;
@@ -467,6 +487,45 @@ static int bd71828_charger_get_property(struct power_supply *psy,
 	return 0;
 }
 
+static int bd71828_charger_set_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					const union power_supply_propval *val)
+{
+	struct bd71828_power *pwr = dev_get_drvdata(psy->dev.parent);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		if (val->intval > 2000000)
+			return -EINVAL;
+
+		if (val->intval < 50000)
+			return -EINVAL;
+
+		if (!pwr->regs->dcin_set)
+			return -EINVAL;
+
+		return regmap_update_bits(pwr->regmap, pwr->regs->dcin_set,
+					  BD7182x_MASK_ILIM,
+					  val->intval / 50000 - 1);
+		break;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bd71828_charger_property_is_writeable(struct power_supply *psy,
+						 enum power_supply_property psp)
+{
+	struct bd71828_power *pwr = dev_get_drvdata(psy->dev.parent);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return !!(pwr->regs->dcin_set);
+	default:
+		return false;
+	}
+}
+
 static int bd71828_battery_get_property(struct power_supply *psy,
 					enum power_supply_property psp,
 					union power_supply_propval *val)
@@ -571,6 +630,7 @@ static int bd71828_battery_property_is_writeable(struct power_supply *psy,
 
 /** @brief ac properties */
 static const enum power_supply_property bd71828_charger_props[] = {
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 };
@@ -600,6 +660,8 @@ static const struct power_supply_desc bd71828_ac_desc = {
 	.properties	= bd71828_charger_props,
 	.num_properties	= ARRAY_SIZE(bd71828_charger_props),
 	.get_property	= bd71828_charger_get_property,
+	.set_property	= bd71828_charger_set_property,
+	.property_is_writeable   = bd71828_charger_property_is_writeable,
 };
 
 static const struct power_supply_desc bd71828_bat_desc = {