usb: typec: tcpm: frs sourcing vbus callback

During FRS hardware autonomously starts to source vbus. Provide
callback to perform chip specific operations.
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201029063138.1429760-5-badhri@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tcpm/tcpm.c

@@ -4091,7 +4091,16 @@ static void _tcpm_pd_vbus_on(struct tcpm_port *port)
 	case SRC_TRY_DEBOUNCE:
 		/* Do nothing, waiting for sink detection */
 		break;
+	case FR_SWAP_SEND:
+	case FR_SWAP_SEND_TIMEOUT:
+	case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
+	case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
+		if (port->tcpc->frs_sourcing_vbus)
+			port->tcpc->frs_sourcing_vbus(port->tcpc);
+		break;
 	case FR_SWAP_SNK_SRC_NEW_SINK_READY:
+		if (port->tcpc->frs_sourcing_vbus)
+			port->tcpc->frs_sourcing_vbus(port->tcpc);
 		tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
 		break;
 

include/linux/usb/tcpm.h

@@ -83,6 +83,9 @@ enum tcpm_transmit_type {
  *		Optional; Called to enable/disable PD 3.0 fast role swap.
  *		Enabling frs is accessory dependent as not all PD3.0
  *		accessories support fast role swap.
+ * @frs_sourcing_vbus:
+ *		Optional; Called to notify that vbus is now being sourced.
+ *		Low level drivers can perform chip specific operations, if any.
  */
 struct tcpc_dev {
 	struct fwnode_handle *fwnode;
@@ -109,6 +112,7 @@ struct tcpc_dev {
 			   const struct pd_message *msg);
 	int (*set_bist_data)(struct tcpc_dev *dev, bool on);
 	int (*enable_frs)(struct tcpc_dev *dev, bool enable);
+	void (*frs_sourcing_vbus)(struct tcpc_dev *dev);
 };
 
 struct tcpm_port;