power: supply: bq24190_charger: Support usb role switching

Change-Id: Ia1e650f15ae55bb0972612b378d093a20d8a8a98

drivers/power/supply/bq24190_charger.c

@@ -18,6 +18,7 @@
 #include <linux/workqueue.h>
 #include <linux/i2c.h>
 #include <linux/extcon-provider.h>
+#include <linux/usb/role.h>
 
 #define	BQ24190_MANUFACTURER	"Texas Instruments"
 
@@ -245,6 +246,7 @@ struct bq24190_dev_info {
 	u8				ss_reg;
 	u8				watchdog;
 	const struct bq24190_chip_info	*info;
+	struct usb_role_switch 		*role_sw;
 };
 
 struct bq24190_chip_info {
@@ -1829,6 +1831,7 @@ static const struct power_supply_desc bq24190_battery_desc = {
 static int bq24190_configure_usb_otg(struct bq24190_dev_info *bdi, u8 ss_reg)
 {
 	bool otg_enabled;
+	enum usb_role usb_role;
 	int ret;
 
 	otg_enabled = !!(ss_reg & BQ24190_REG_SS_VBUS_STAT_MASK);
@@ -1837,6 +1840,11 @@ static int bq24190_configure_usb_otg(struct bq24190_dev_info *bdi, u8 ss_reg)
 		dev_err(bdi->dev, "Can't set extcon state to %d: %d\n",
 			otg_enabled, ret);
 
+	if (bdi->role_sw) {
+		usb_role = otg_enabled ? USB_ROLE_DEVICE : USB_ROLE_NONE;
+		usb_role_switch_set_role(bdi->role_sw, usb_role);
+	}
+
 	return ret;
 }
 
@@ -2147,6 +2155,7 @@ static int bq24190_probe(struct i2c_client *client)
 	struct device *dev = &client->dev;
 	struct power_supply_config charger_cfg = {}, battery_cfg = {};
 	struct bq24190_dev_info *bdi;
+	struct fwnode_handle *ep, *remote;
 	int ret;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
@@ -2189,6 +2198,19 @@ static int bq24190_probe(struct i2c_client *client)
 	if (ret < 0)
 		return ret;
 
+	/* Role switch is optional */
+	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
+	if (ep) {
+		remote = fwnode_graph_get_remote_endpoint(ep);
+		if (remote) {
+			bdi->role_sw = fwnode_usb_role_switch_get(remote);
+			if (IS_ERR(bdi->role_sw)) {
+				ret = PTR_ERR(bdi->role_sw);
+				return dev_err_probe(dev, ret, "USB role switch handle not found\n");
+			}
+		}
+	}
+
 	pm_runtime_enable(dev);
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, 600);
@@ -2286,6 +2308,9 @@ static void bq24190_remove(struct i2c_client *client)
 	struct bq24190_dev_info *bdi = i2c_get_clientdata(client);
 	int error;
 
+	if (bdi->role_sw)
+		usb_role_switch_put(bdi->role_sw);
+
 	error = pm_runtime_resume_and_get(bdi->dev);
 	if (error < 0)
 		dev_warn(bdi->dev, "pm_runtime_get failed: %i\n", error);