AXP813 and AXP803 PMICs can control input current and
minimum voltage.

Both of these values are configurable.

Signed-off-by: Oskari Lemmela <redacted>
Reviewed-by: Quentin Schulz <redacted>
---
 drivers/power/supply/axp20x_ac_power.c | 92 ++++++++++++++++++++++++++
 include/linux/mfd/axp20x.h             |  1 +
 2 files changed, 93 insertions(+)

diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c
index 0771f951b11f..059a97d6e14c 100644
--- a/drivers/power/supply/axp20x_ac_power.c
+++ b/drivers/power/supply/axp20x_ac_power.c

@@ -27,6 +27,16 @@
 #define AXP20X_PWR_STATUS_ACIN_PRESENT BIT(7)
 #define AXP20X_PWR_STATUS_ACIN_AVAIL   BIT(6)

+#define AXP813_VHOLD_MASK              GENMASK(5, 3)
+#define AXP813_VHOLD_UV_TO_BIT(x)      ((((x) / 100000) - 40) << 3)
+#define AXP813_VHOLD_REG_TO_UV(x)      \
+       (((((x) & AXP813_VHOLD_MASK) >> 3) + 40) * 100000)
+
+#define AXP813_CURR_LIMIT_MASK         GENMASK(2, 0)
+#define AXP813_CURR_LIMIT_UA_TO_BIT(x) (((x) / 500000) - 3)
+#define AXP813_CURR_LIMIT_REG_TO_UA(x) \
+       ((((x) & AXP813_CURR_LIMIT_MASK) + 3) * 500000)
+
 #define DRVNAME "axp20x-ac-power-supply"

 struct axp20x_ac_power {

@@ -102,6 +112,55 @@ static int axp20x_ac_power_get_property(struct power_supply *psy,

                return 0;

+       case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+               ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
+               if (ret)
+                       return ret;
+
+               val->intval = AXP813_VHOLD_REG_TO_UV(reg);
+
+               return 0;
+
+       case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+               ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
+               if (ret)
+                       return ret;
+
+               val->intval = AXP813_CURR_LIMIT_REG_TO_UA(reg);

+
        default:
                return -EINVAL;
        }

@@ -109,6 +168,13 @@ static int axp20x_ac_power_get_property(struct power_supply *psy,
        return -EINVAL;
 }

+static int axp813_ac_power_prop_writeable(struct power_supply *psy,
+                                         enum power_supply_property psp)
+{
+       return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
+              psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
+}
+
 static enum power_supply_property axp20x_ac_power_properties[] = {
        POWER_SUPPLY_PROP_HEALTH,
        POWER_SUPPLY_PROP_PRESENT,

@@ -123,6 +189,14 @@ static enum power_supply_property axp22x_ac_power_properties[] = {
        POWER_SUPPLY_PROP_ONLINE,
 };

+static enum power_supply_property axp813_ac_power_properties[] = {
+       POWER_SUPPLY_PROP_HEALTH,
+       POWER_SUPPLY_PROP_PRESENT,
+       POWER_SUPPLY_PROP_ONLINE,
+       POWER_SUPPLY_PROP_VOLTAGE_MIN,
+       POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+};
+
 static const struct power_supply_desc axp20x_ac_power_desc = {
        .name = "axp20x-ac",
        .type = POWER_SUPPLY_TYPE_MAINS,

@@ -139,6 +213,16 @@ static const struct power_supply_desc axp22x_ac_power_desc = {
        .get_property = axp20x_ac_power_get_property,
 };

+static const struct power_supply_desc axp813_ac_power_desc = {
+       .name = "axp813-ac",
+       .type = POWER_SUPPLY_TYPE_MAINS,
+       .properties = axp813_ac_power_properties,
+       .num_properties = ARRAY_SIZE(axp813_ac_power_properties),
+       .property_is_writeable = axp813_ac_power_prop_writeable,
+       .get_property = axp20x_ac_power_get_property,
+       .set_property = axp813_ac_power_set_property,
+};
+
 struct axp_data {
        const struct power_supply_desc  *power_desc;
        bool                            acin_adc;

@@ -154,6 +238,11 @@ static const struct axp_data axp22x_data = {
        .acin_adc = false,
 };

+static const struct axp_data axp813_data = {
+       .power_desc = &axp813_ac_power_desc,
+       .acin_adc = false,
+};
+
 static int axp20x_ac_power_probe(struct platform_device *pdev)
 {
        struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);

@@ -234,6 +323,9 @@ static const struct of_device_id axp20x_ac_power_match[] = {
        }, {
                .compatible = "x-powers,axp221-ac-power-supply",
                .data = &axp22x_data,
+       }, {
+               .compatible = "x-powers,axp813-ac-power-supply",
+               .data = &axp813_data,
        }, { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);

diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index 517e60eecbcb..2302b620d238 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h

@@ -266,6 +266,7 @@ enum axp20x_variants {
 #define AXP288_RT_BATT_V_H             0xa0
 #define AXP288_RT_BATT_V_L             0xa1

+#define AXP813_ACIN_PATH_CTRL          0x3a
 #define AXP813_ADC_RATE                        0x85

 /* Fuel Gauge */
--

2.17.1