[PATCH v2 6/6] power: supply: add AC power supply driver for AXP813

[Oskari Lemmela]

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

Both of these values are configurable.

Signed-off-by: Oskari Lemmela <osk...@lemmela.net>
---
 drivers/power/supply/axp20x_ac_power.c | 92 ++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/drivers/power/supply/axp20x_ac_power.c 
b/drivers/power/supply/axp20x_ac_power.c
index 0771f951b11f..92a92354f6f0 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);
+
+               return 0;
+
+       default:
+               return -EINVAL;
+       }
+
+       return -EINVAL;
+}
+
+static int axp20x_ac_power_set_property(struct power_supply *psy,
+                                       enum power_supply_property psp,
+                                       const union power_supply_propval *val)
+{
+       struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
+
+       switch (psp) {
+       case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+               if (val->intval < 4000000 || val->intval > 4700000)
+                       return -EINVAL;
+
+               return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
+                                         AXP813_VHOLD_MASK,
+                                         AXP813_VHOLD_UV_TO_BIT(val->intval));
+
+       case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+               if (val->intval < 1500000 || val->intval > 4000000)
+                       return -EINVAL;
+
+               return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
+                                         AXP813_CURR_LIMIT_MASK,
+                                         AXP813_CURR_LIMIT_UA_TO_BIT
+                                         (val->intval));
+
        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 = axp20x_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);
-- 
2.17.1