linux-kernel - [PATCH v4 2/4] usb: typec: Update sysfs when setting ops

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Message-ID: <20240510184324.2944101-3-jthies@google.com>
Date: Fri, 10 May 2024 18:43:22 +0000
From: Jameson Thies <jthies@...gle.com>
To: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org
Cc: jthies@...gle.com, pmalani@...omium.org, bleung@...gle.com, 
	abhishekpandit@...omium.org, andersson@...nel.org, 
	dmitry.baryshkov@...aro.org, fabrice.gasnier@...s.st.com, 
	gregkh@...uxfoundation.org, hdegoede@...hat.com, neil.armstrong@...aro.org, 
	rajaram.regupathy@...el.com, saranya.gopal@...el.com, 
	linux-kernel@...r.kernel.org, Benson Leung <bleung@...omium.org>
Subject: [PATCH v4 2/4] usb: typec: Update sysfs when setting ops

From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>

When adding altmode ops, update the sysfs group so that visibility is
also recalculated.

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
Signed-off-by: Jameson Thies <jthies@...gle.com>
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---
Changes in V4:
- None.

Changes in V3:
- None.

Changes in V2:
- None.

 drivers/usb/typec/altmodes/displayport.c |  2 +-
 drivers/usb/typec/class.c                | 18 +++++++++++++++++-
 drivers/usb/typec/ucsi/displayport.c     |  2 +-
 include/linux/usb/typec.h                |  3 +++
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 596cd4806018b..92cc1b1361208 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -746,7 +746,7 @@ int dp_altmode_probe(struct typec_altmode *alt)
 	dp->alt = alt;
 
 	alt->desc = "DisplayPort";
-	alt->ops = &dp_altmode_ops;
+	typec_altmode_set_ops(alt, &dp_altmode_ops);
 
 	if (plug) {
 		plug->desc = "Displayport";
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9610e647a8d48..9262fcd4144f8 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -467,6 +467,22 @@ static const struct attribute_group *typec_altmode_groups[] = {
 	NULL
 };
 
+/**
+ * typec_altmode_set_ops - Set ops for altmode
+ * @adev: Handle to the alternate mode
+ * @ops: Ops for the alternate mode
+ *
+ * After setting ops, attribute visiblity needs to be refreshed if the alternate
+ * mode can be activated.
+ */
+void typec_altmode_set_ops(struct typec_altmode *adev,
+			   const struct typec_altmode_ops *ops)
+{
+	adev->ops = ops;
+	sysfs_update_group(&adev->dev.kobj, &typec_altmode_group);
+}
+EXPORT_SYMBOL_GPL(typec_altmode_set_ops);
+
 static int altmode_id_get(struct device *dev)
 {
 	struct ida *ids;
@@ -2317,7 +2333,7 @@ void typec_port_register_altmodes(struct typec_port *port,
 			continue;
 		}
 
-		alt->ops = ops;
+		typec_altmode_set_ops(alt, ops);
 		typec_altmode_set_drvdata(alt, drvdata);
 		altmodes[index] = alt;
 		index++;
diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c
index d9d3c91125ca8..eb7b8d6e47d00 100644
--- a/drivers/usb/typec/ucsi/displayport.c
+++ b/drivers/usb/typec/ucsi/displayport.c
@@ -337,7 +337,7 @@ struct typec_altmode *ucsi_register_displayport(struct ucsi_connector *con,
 	dp->con = con;
 	dp->alt = alt;
 
-	alt->ops = &ucsi_displayport_ops;
+	typec_altmode_set_ops(alt, &ucsi_displayport_ops);
 	typec_altmode_set_drvdata(alt, dp);
 
 	return alt;
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index b35b427561ab5..549275f8ac1b3 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -167,6 +167,9 @@ struct typec_port *typec_altmode2port(struct typec_altmode *alt);
 
 void typec_altmode_update_active(struct typec_altmode *alt, bool active);
 
+void typec_altmode_set_ops(struct typec_altmode *alt,
+			   const struct typec_altmode_ops *ops);
+
 enum typec_plug_index {
 	TYPEC_PLUG_SOP_P,
 	TYPEC_PLUG_SOP_PP,
-- 
2.45.0.118.g7fe29c98d7-goog