[PATCH 2/2] power: supply: qcom_battmgr: Add support batteryless boards as MAINS

[Rakesh Kota]

Add support for the "qcom,batteryless" device tree property.
When this boolean property is present, the driver registers the power
supply as POWER_SUPPLY_TYPE_MAINS instead of BATTERY. This prevents
userspace from triggering battery power-saving sequences when using
powered by 12V adapters.

Signed-off-by: Rakesh Kota <rakesh.kota@xxxxxxxxxxxxxxxx>
---
 drivers/power/supply/qcom_battmgr.c | 47 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
index 490137a23d00e97a9e6ced21d1e66fe637db6c9d..35d266375d8c46b161a64f9c2a8c6054dc2211de 100644
--- a/drivers/power/supply/qcom_battmgr.c
+++ b/drivers/power/supply/qcom_battmgr.c
@@ -332,6 +332,7 @@ struct qcom_battmgr {
 	struct qcom_battmgr_wireless wireless;
 
 	struct work_struct enable_work;
+	bool batteryless;
 
 	/*
 	 * @lock is used to prevent concurrent power supply requests to the
@@ -930,6 +931,47 @@ static const struct power_supply_desc sm8550_bat_psy_desc = {
 	.property_is_writeable = qcom_battmgr_bat_is_writeable,
 };
 
+static int qcom_battmgr_dcin_get_property(struct power_supply *psy,
+					  enum power_supply_property psp,
+					  union power_supply_propval *val)
+{
+	struct qcom_battmgr *battmgr = power_supply_get_drvdata(psy);
+	int ret;
+
+	if (!battmgr->service_up)
+		return -EAGAIN;
+
+	ret = qcom_battmgr_bat_sm8350_update(battmgr, psp);
+	if (ret < 0)
+		return ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = battmgr->status.status;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = battmgr->info.present;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const enum power_supply_property dcin_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+};
+
+static const struct power_supply_desc dcin_psy_desc = {
+	.name = "qcom-battmgr-dcin",
+	.type = POWER_SUPPLY_TYPE_MAINS,
+	.properties = dcin_props,
+	.num_properties = ARRAY_SIZE(dcin_props),
+	.get_property = qcom_battmgr_dcin_get_property,
+};
+
 static int qcom_battmgr_ac_get_property(struct power_supply *psy,
 					enum power_supply_property psp,
 					union power_supply_propval *val)
@@ -1652,6 +1694,7 @@ static int qcom_battmgr_probe(struct auxiliary_device *adev,
 	mutex_init(&battmgr->lock);
 	init_completion(&battmgr->ack);
 
+	battmgr->batteryless = device_property_read_bool(dev, "qcom,batteryless");
 	match = of_match_device(qcom_battmgr_of_variants, dev->parent);
 	if (match)
 		battmgr->variant = (unsigned long)match->data;
@@ -1690,7 +1733,9 @@ static int qcom_battmgr_probe(struct auxiliary_device *adev,
 			return dev_err_probe(dev, PTR_ERR(battmgr->wls_psy),
 					     "failed to register wireless charing power supply\n");
 	} else {
-		if (battmgr->variant == QCOM_BATTMGR_SM8550)
+		if (battmgr->batteryless)
+			psy_desc = &dcin_psy_desc;
+		else if (battmgr->variant == QCOM_BATTMGR_SM8550)
 			psy_desc = &sm8550_bat_psy_desc;
 		else
 			psy_desc = &sm8350_bat_psy_desc;

-- 
2.34.1