linux-kernel - [PATCH 1/2] usb: typec: Add helper to get partner device struct

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Message-Id: <20221121201337.2772216-2-pmalani@chromium.org>
Date:   Mon, 21 Nov 2022 20:13:35 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        chrome-platform@...ts.linux.dev
Cc:     Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: [PATCH 1/2] usb: typec: Add helper to get partner device struct

Some port drivers may want to set a Type-C partner as a parent for a
USB Power Delivery object, but the Type-C partner struct isn't exposed
outside of the Type-C class driver. Add a helper which returns a pointer
to the Type-C partner's device struct, so that it can be supplied as the
parent to the PD object.

Cc: Benson Leung <bleung@...omium.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/usb/typec/class.c | 13 +++++++++++++
 include/linux/usb/typec.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index bd5e5dd70431..154c70630432 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -821,6 +821,19 @@ void typec_partner_set_svdm_version(struct typec_partner *partner,
 }
 EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version);
 
+
+/**
+ * typec_partner_to_dev - Get the device struct of a USB Type-C partner.
+ * @partner: USB Type-C Partner
+ *
+ * Returns a pointer to the device struct or NULL.
+ */
+struct device *typec_partner_to_dev(struct typec_partner *partner)
+{
+	return partner ? &partner->dev : NULL;
+}
+EXPORT_SYMBOL_GPL(typec_partner_to_dev);
+
 /**
  * typec_register_partner - Register a USB Type-C Partner
  * @port: The USB Type-C Port the partner is connected to
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 7751bedcae5d..085be3e94ff8 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -327,6 +327,8 @@ void typec_partner_set_svdm_version(struct typec_partner *partner,
 				    enum usb_pd_svdm_ver svdm_version);
 int typec_get_negotiated_svdm_version(struct typec_port *port);
 
+struct device *typec_partner_to_dev(struct typec_partner *partner);
+
 int typec_port_set_usb_power_delivery(struct typec_port *port, struct usb_power_delivery *pd);
 int typec_partner_set_usb_power_delivery(struct typec_partner *partner,
 					 struct usb_power_delivery *pd);
-- 
2.38.1.584.g0f3c55d4c2-goog