linux-kernel - [RFC PATCH v1 08/12] usb: typec: support generating Type-C port names for userspace

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Message-Id: <20230903214150.2877023-9-dmitry.baryshkov@linaro.org>
Date:   Mon,  4 Sep 2023 00:41:46 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Janne Grunau <j@...nau.net>, Simon Ser <contact@...rsion.fr>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        freedreno@...ts.freedesktop.org
Subject: [RFC PATCH v1 08/12] usb: typec: support generating Type-C port names for userspace

We need a way to generate and return the Type-C port device names. For
example, it is going to be used by the DRM to provide PATH property for
DisplayPort connectors.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/usb/typec/class.c | 14 ++++++++++++++
 include/linux/usb/typec.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9c1dbf3c00e0..7394a2ecef6f 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -2327,6 +2327,20 @@ void typec_unregister_port(struct typec_port *port)
 }
 EXPORT_SYMBOL_GPL(typec_unregister_port);
 
+/**
+ * typec_port_get_name - Get USB Type-C Port name
+ * @port: The port to describe
+ *
+ * Returns a name of the passed USB Type-C port on success or NULL when the
+ * port has not been enumerated yet. The resulting string should be freed by
+ * the caller.
+ */
+char *typec_port_get_name(struct typec_port *port)
+{
+	return kasprintf(GFP_KERNEL, "typec:%s", dev_name(&port->dev));
+}
+EXPORT_SYMBOL_GPL(typec_port_get_name);
+
 static int __init typec_init(void)
 {
 	int ret;
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 8fa781207970..4aa9c9378383 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -303,6 +303,8 @@ struct typec_plug *typec_register_plug(struct typec_cable *cable,
 				       struct typec_plug_desc *desc);
 void typec_unregister_plug(struct typec_plug *plug);
 
+char *typec_port_get_name(struct typec_port *port);
+
 void typec_set_data_role(struct typec_port *port, enum typec_data_role role);
 void typec_set_pwr_role(struct typec_port *port, enum typec_role role);
 void typec_set_vconn_role(struct typec_port *port, enum typec_role role);
-- 
2.39.2