power: supply: axp20x_battery: allow disabling battery charging

Allow disabling and re-enabling battery charging of an axp209 PMIC
through a writable status property. With the current driver code
charging is always on.

This works on the axp209 of Banana {Pi M1+,Pro} and should work on all
AXP chips.

Signed-off-by: Hermann.Lauer@uni-heidelberg.de
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
index e84b6e4..18a9db0 100644 (file)
--- a/drivers/power/supply/axp20x_battery.c
+++ b/drivers/power/supply/axp20x_battery.c
@@ -40,6 +40,7 @@
 #define AXP209_FG_PERCENT              GENMASK(6, 0)
 #define AXP22X_FG_VALID                        BIT(7)
 
+#define AXP20X_CHRG_CTRL1_ENABLE       BIT(7)
 #define AXP20X_CHRG_CTRL1_TGT_VOLT     GENMASK(6, 5)
 #define AXP20X_CHRG_CTRL1_TGT_4_1V     (0 << 5)
 #define AXP20X_CHRG_CTRL1_TGT_4_15V    (1 << 5)
@@ -468,7 +469,18 @@ static int axp20x_battery_set_prop(struct power_supply *psy,
        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
                return axp20x_set_max_constant_charge_current(axp20x_batt,
                                                              val->intval);
-
+       case POWER_SUPPLY_PROP_STATUS:
+               switch (val->intval) {
+               case POWER_SUPPLY_STATUS_CHARGING:
+                       return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
+                               AXP20X_CHRG_CTRL1_ENABLE, AXP20X_CHRG_CTRL1_ENABLE);
+
+               case POWER_SUPPLY_STATUS_DISCHARGING:
+               case POWER_SUPPLY_STATUS_NOT_CHARGING:
+                       return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
+                               AXP20X_CHRG_CTRL1_ENABLE, 0);
+               }
+               fallthrough;
        default:
                return -EINVAL;
        }
@@ -491,7 +503,8 @@ static enum power_supply_property axp20x_battery_props[] = {
 static int axp20x_battery_prop_writeable(struct power_supply *psy,
                                         enum power_supply_property psp)
 {
-       return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
+       return psp == POWER_SUPPLY_PROP_STATUS ||
+              psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
               psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN ||
               psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
               psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;