linux-kernel - [PATCH 5/9] power: supply: max77705

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Message-Id: <20250830-max77705_77976_charger_improvement-v1-5-e976db3fd432@gmail.com>
Date: Sat, 30 Aug 2025 23:45:18 +0300
From: Dzmitry Sankouski <dsankouski@...il.com>
To: Chanwoo Choi <cw00.choi@...sung.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>, Lee Jones <lee@...nel.org>, 
 Sebastian Reichel <sre@...nel.org>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Sebastian Reichel <sebastian.reichel@...labora.com>, 
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
 Dzmitry Sankouski <dsankouski@...il.com>
Subject: [PATCH 5/9] power: supply: max77705_charger: add writable
 properties

Add INPUT_CURRENT_LIMIT, CONSTANT_CHARGE_CURRENT properties as writeable
to be able to control input power consumption and charging speed.

Signed-off-by: Dzmitry Sankouski <dsankouski@...il.com>
---
 drivers/power/supply/max77705_charger.c | 54 +++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/power/supply/max77705_charger.c b/drivers/power/supply/max77705_charger.c
index 1cd122e96953..de2184327ff8 100644
--- a/drivers/power/supply/max77705_charger.c
+++ b/drivers/power/supply/max77705_charger.c
@@ -105,6 +105,17 @@ static int max77705_get_online(struct regmap *regmap, int *val)
 	return 0;
 }
 
+static int max77705_set_integer(struct max77705_charger_data *chg, enum max77705_field_idx fidx,
+				unsigned int clamp_min, unsigned int clamp_max,
+				unsigned int div, int val)
+{
+	unsigned int regval;
+
+	regval = clamp_val(val, clamp_min, clamp_max) / div;
+
+	return regmap_field_write(chg->rfield[fidx], regval);
+}
+
 static int max77705_check_battery(struct max77705_charger_data *chg, int *val)
 {
 	unsigned int reg_data;
@@ -384,12 +395,55 @@ static int max77705_chg_get_property(struct power_supply *psy,
 	return 0;
 }
 
+static int max77705_set_property(struct power_supply *psy,
+				 enum power_supply_property psp,
+				 const union power_supply_propval *val)
+{
+	struct max77705_charger_data *charger = power_supply_get_drvdata(psy);
+	int err = 0;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		err = max77705_set_integer(charger, MAX77705_CHG_CC_LIM,
+					   MAX77705_CURRENT_CHGIN_MIN,
+					   MAX77705_CURRENT_CHGIN_MAX,
+					   MAX77705_CURRENT_CHG_STEP,
+					   val->intval);
+		break;
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		err = max77705_set_integer(charger, MAX77705_CHG_CHGIN_LIM,
+					   MAX77705_CURRENT_CHGIN_MIN,
+					   MAX77705_CURRENT_CHGIN_MAX,
+					   MAX77705_CURRENT_CHGIN_STEP,
+					   val->intval);
+		break;
+	default:
+		err = -EINVAL;
+	}
+
+	return err;
+};
+
+static int max77705_property_is_writeable(struct power_supply *psy,
+					  enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static const struct power_supply_desc max77705_charger_psy_desc = {
 	.name = "max77705-charger",
 	.type		= POWER_SUPPLY_TYPE_USB,
 	.properties = max77705_charger_props,
+	.property_is_writeable	= max77705_property_is_writeable,
 	.num_properties = ARRAY_SIZE(max77705_charger_props),
 	.get_property = max77705_chg_get_property,
+	.set_property		= max77705_set_property,
 };
 
 static void max77705_chgin_isr_work(struct work_struct *work)

-- 
2.39.5