linux-kernel - [RFC PATCH v1 09/12] usb: typec: tcpm: support generating Type-C port names for userspace

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Message-Id: <20230903214150.2877023-10-dmitry.baryshkov@linaro.org>
Date:   Mon,  4 Sep 2023 00:41:47 +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 09/12] usb: typec: tcpm: 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/tcpm/tcpm.c | 14 ++++++++++++++
 include/linux/usb/tcpm.h      |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index d962f67c95ae..9709b56a3046 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -5539,6 +5539,20 @@ bool tcpm_port_is_toggling(struct tcpm_port *port)
 }
 EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
 
+/**
+ * tcpm_port_get_name - get the name of the corresponding USB Type-C port
+ * @port: TCPM port instance
+ *
+ * Returns a name of the USB Type-C port correponding to the passed TCPM port
+ * instance on success or NULL when the port has not been enumerated yet. The
+ * resulting string should be freed by the caller.
+ */
+char *tcpm_port_get_name(struct tcpm_port *port)
+{
+	return typec_port_get_name(port->typec_port);
+}
+EXPORT_SYMBOL_GPL(tcpm_port_get_name);
+
 static void tcpm_enable_frs_work(struct kthread_work *work)
 {
 	struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index ab7ca872950b..623c34788680 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -161,6 +161,8 @@ struct tcpm_port;
 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc);
 void tcpm_unregister_port(struct tcpm_port *port);
 
+char *tcpm_port_get_name(struct tcpm_port *port);
+
 void tcpm_vbus_change(struct tcpm_port *port);
 void tcpm_cc_change(struct tcpm_port *port);
 void tcpm_sink_frs(struct tcpm_port *port);
-- 
2.39.2