linux-kernel - [PATCH v2 1/2] usb: typec: Add partner PD object wrapper

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Date:   Tue, 22 Nov 2022 22:05:36 +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>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Benson Leung <bleung@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: [PATCH v2 1/2] usb: typec: Add partner PD object wrapper

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 wrapper to
usb_power_delivery_register() which sets the provided Type-C partner
as a parent to the USB PD object. This helps to avoid exposing the
Type-C partner's device struct unnecessarily.

Suggested-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: Benson Leung <bleung@...omium.org>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---

Changes since v1:
- Patch first introduced in v2.

 drivers/usb/typec/class.c | 19 +++++++++++++++++++
 include/linux/usb/typec.h |  4 ++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index bd5e5dd70431..5897905cb4f0 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -821,6 +821,25 @@ void typec_partner_set_svdm_version(struct typec_partner *partner,
 }
 EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version);
 
+/**
+ * typec_partner_usb_power_delivery_register - Register Type-C partner USB Power Delivery Support
+ * @partner: Type-C partner device.
+ * @desc: Description of the USB PD contract.
+ *
+ * This routine is a wrapper around usb_power_delivery_register(). It registers
+ * USB Power Delivery Capabilities for a Type-C partner device. Specifically,
+ * it sets the Type-C partner device as a parent for the resulting USB Power Delivery object.
+ *
+ * Returns handle to struct usb_power_delivery or ERR_PTR.
+ */
+struct usb_power_delivery *
+typec_partner_usb_power_delivery_register(struct typec_partner *partner,
+					  struct usb_power_delivery_desc *desc)
+{
+	return usb_power_delivery_register(&partner->dev, desc);
+}
+EXPORT_SYMBOL_GPL(typec_partner_usb_power_delivery_register);
+
 /**
  * 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..8fa781207970 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -23,6 +23,7 @@ struct fwnode_handle;
 struct device;
 
 struct usb_power_delivery;
+struct usb_power_delivery_desc;
 
 enum typec_port_type {
 	TYPEC_PORT_SRC,
@@ -327,6 +328,9 @@ 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 usb_power_delivery *typec_partner_usb_power_delivery_register(struct typec_partner *partner,
+							struct usb_power_delivery_desc *desc);
+
 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