[PATCH 5/7] power: supply: axp20x_usb_power: Allow offlining

[Samuel Holland]

AXP803/AXP813 have a flag that enables/disables the USB power supply
input. Allow control of this flag via the ONLINE property on those
variants.

It may be necessary to offline the USB power supply input when using
the USB port in OTG mode, or to allow userspace to disable charging.

Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
---
 drivers/power/supply/axp20x_usb_power.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index 2d7272e19a87..f49c8ff4a3f0 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -29,6 +29,8 @@
 
 #define AXP20X_USB_STATUS_VBUS_VALID	BIT(2)
 
+#define AXP20X_VBUS_PATH_SELECT		BIT(7)
+
 #define AXP20X_VBUS_VHOLD_uV(b)		(4000000 + (((b) >> 3) & 7) * 100000)
 #define AXP20X_VBUS_VHOLD_MASK		GENMASK(5, 3)
 #define AXP20X_VBUS_VHOLD_OFFSET	3
@@ -344,6 +346,12 @@ static int axp20x_usb_power_set_property(struct power_supply *psy,
 	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 
 	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		return regmap_update_bits(power->regmap,
+					  AXP20X_VBUS_IPSOUT_MGMT,
+					  AXP20X_VBUS_PATH_SELECT,
+					  !val->intval);
+
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 		return axp20x_usb_power_set_voltage_min(power, val->intval);
 
@@ -363,6 +371,17 @@ static int axp20x_usb_power_set_property(struct power_supply *psy,
 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
 					   enum power_supply_property psp)
 {
+	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
+
+	/*
+	 * Both AXP2xx and AXP8xx have a VBUS path select flag.
+	 * On AXP2xx, setting the flag enables VBUS (ignoring N_VBUSEN).
+	 * On AXP8xx, setting the flag disables VBUS (ignoring N_VBUSEN).
+	 * So we only expose the control on AXP8xx where it is meaningful.
+	 */
+	if (psp == POWER_SUPPLY_PROP_ONLINE)
+		return power->axp20x_id == AXP813_ID;
+
 	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 	       psp == POWER_SUPPLY_PROP_CURRENT_MAX;
 }
-- 
2.23.0