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Message-Id: <20251120022343.250-2-kernel@airkyi.com>
Date: Thu, 20 Nov 2025 10:23:33 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
Peter Chen <hzpeterchen@...il.com>,
Luca Ceresoli <luca.ceresoli@...tlin.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Vinod Koul <vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Heiko Stuebner <heiko@...ech.de>,
Sandy Huang <hjc@...k-chips.com>,
Andy Yan <andy.yan@...k-chips.com>,
Yubing Zhang <yubing.zhang@...k-chips.com>,
Frank Wang <frank.wang@...k-chips.com>,
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>,
David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>,
Amit Sunil Dhamne <amitsd@...gle.com>,
Chaoyi Chen <chaoyi.chen@...k-chips.com>,
Dragan Simic <dsimic@...jaro.org>,
Johan Jonker <jbx6244@...il.com>,
Diederik de Haas <didi.debian@...ow.org>,
Peter Robinson <pbrobinson@...il.com>
Cc: linux-usb@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-phy@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH v10 01/11] usb: typec: Add notifier functions
From: Chaoyi Chen <chaoyi.chen@...k-chips.com>
Some other part of kernel may want to know the event of typec bus.
This patch add common notifier function to notify these event.
Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
---
Changes in v10:
- Notify TYPEC_ALTMODE_UNREGISTERED when altmode removed.
Changes in v9:
- Remove redundant header files.
Changes in v8:
- Fix coding style.
drivers/usb/typec/Makefile | 2 +-
drivers/usb/typec/bus.h | 2 ++
drivers/usb/typec/class.c | 3 +++
drivers/usb/typec/notify.c | 23 +++++++++++++++++++++++
include/linux/usb/typec_altmode.h | 9 +++++++++
5 files changed, 38 insertions(+), 1 deletion(-)
create mode 100644 drivers/usb/typec/notify.c
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index 7a368fea61bc..20d09c5314d7 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_TYPEC) += typec.o
-typec-y := class.o mux.o bus.o pd.o retimer.o
+typec-y := class.o mux.o notify.o bus.o pd.o retimer.o
typec-$(CONFIG_ACPI) += port-mapper.o
obj-$(CONFIG_TYPEC) += altmodes/
obj-$(CONFIG_TYPEC_TCPM) += tcpm/
diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h
index 643b8c81786d..820b59b6d434 100644
--- a/drivers/usb/typec/bus.h
+++ b/drivers/usb/typec/bus.h
@@ -26,6 +26,8 @@ struct altmode {
struct altmode *plug[2];
};
+void typec_notify_event(unsigned long event, void *data);
+
#define to_altmode(d) container_of(d, struct altmode, adev)
extern const struct bus_type typec_bus;
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9b2647cb199b..1ccf5385d559 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -600,6 +600,8 @@ typec_register_altmode(struct device *parent,
return ERR_PTR(ret);
}
+ typec_notify_event(TYPEC_ALTMODE_REGISTERED, &alt->adev);
+
return &alt->adev;
}
@@ -614,6 +616,7 @@ void typec_unregister_altmode(struct typec_altmode *adev)
{
if (IS_ERR_OR_NULL(adev))
return;
+ typec_notify_event(TYPEC_ALTMODE_UNREGISTERED, adev);
typec_retimer_put(to_altmode(adev)->retimer);
typec_mux_put(to_altmode(adev)->mux);
device_unregister(&adev->dev);
diff --git a/drivers/usb/typec/notify.c b/drivers/usb/typec/notify.c
new file mode 100644
index 000000000000..9e50b54da359
--- /dev/null
+++ b/drivers/usb/typec/notify.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/notifier.h>
+
+#include "bus.h"
+
+static BLOCKING_NOTIFIER_HEAD(typec_notifier_list);
+
+int typec_altmode_register_notify(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&typec_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(typec_altmode_register_notify);
+
+int typec_altmode_unregister_notify(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&typec_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(typec_altmode_unregister_notify);
+
+void typec_notify_event(unsigned long event, void *data)
+{
+ blocking_notifier_call_chain(&typec_notifier_list, event, data);
+}
diff --git a/include/linux/usb/typec_altmode.h b/include/linux/usb/typec_altmode.h
index f7db3bd4c90e..59e20702504b 100644
--- a/include/linux/usb/typec_altmode.h
+++ b/include/linux/usb/typec_altmode.h
@@ -10,6 +10,7 @@
#define MODE_DISCOVERY_MAX 6
struct typec_altmode_ops;
+struct notifier_block;
/**
* struct typec_altmode - USB Type-C alternate mode device
@@ -77,6 +78,14 @@ int typec_altmode_notify(struct typec_altmode *altmode, unsigned long conf,
const struct typec_altmode *
typec_altmode_get_partner(struct typec_altmode *altmode);
+enum usb_typec_event {
+ TYPEC_ALTMODE_REGISTERED,
+ TYPEC_ALTMODE_UNREGISTERED,
+};
+
+int typec_altmode_register_notify(struct notifier_block *nb);
+int typec_altmode_unregister_notify(struct notifier_block *nb);
+
/**
* struct typec_cable_ops - Cable alternate mode operations vector
* @enter: Operations to be executed with Enter Mode Command
--
2.51.1
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