From 912795eaa2fe7ab5da57cf0d836674d1b23d0983 Mon Sep 17 00:00:00 2001
From: Badhri Jagan Sridharan <badhri@google.com>
Date: Mon, 23 Nov 2020 17:52:27 -0800
Subject: [PATCH] ANDROID: usb: typec: tcpm: Add a helper function to port is
 toggling

Helper function needed for fixing TD.4.7.4 and TEST.PD.PROT.SRC.10
PR_Swap while having contamiant detection enabled.

tcpm_is_toggling returns true when a DRP port is in one of the toggling
states.

Bug: 169213252
Bug: 174094095
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Change-Id: Ie3837c3067fd91f3e9ea4afdfc1d5c7bf44659de
---
 drivers/usb/typec/tcpm/tcpm.c | 10 ++++++++++
 include/linux/usb/tcpm.h      |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 16b5ab3953f3..969411e3b8df 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3075,6 +3075,16 @@ static inline enum tcpm_state unattached_state(struct tcpm_port *port)
 	return SNK_UNATTACHED;
 }
 
+bool tcpm_is_toggling(struct tcpm_port *port)
+{
+	if (port->port_type == TYPEC_PORT_DRP)
+		return port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
+			port->state == TOGGLING;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(tcpm_is_toggling);
+
 static void tcpm_check_send_discover(struct tcpm_port *port)
 {
 	if (port->data_role == TYPEC_HOST && port->send_discover &&
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index a206db0f8ad1..6b85117c2342 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -166,5 +166,6 @@ void tcpm_pd_transmit_complete(struct tcpm_port *port,
 void tcpm_pd_hard_reset(struct tcpm_port *port);
 void tcpm_tcpc_reset(struct tcpm_port *port);
 bool tcpm_is_debouncing(struct tcpm_port *tcpm);
+bool tcpm_is_toggling(struct tcpm_port *port);
 
 #endif /* __LINUX_USB_TCPM_H */