linux-kernel - [PATCH v3 05/17] usb: typec: Add device managed typec_switch

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Message-ID: <20240819223834.2049862-6-swboyd@chromium.org>
Date: Mon, 19 Aug 2024 15:38:19 -0700
From: Stephen Boyd <swboyd@...omium.org>
To: chrome-platform@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	devicetree@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	Guenter Roeck <groeck@...omium.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Lee Jones <lee@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Prashant Malani <pmalani@...omium.org>,
	Robert Foss <rfoss@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Daniel Scally <djrscally@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Ivan Orlov <ivan.orlov0322@...il.com>,
	linux-acpi@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Vinod Koul <vkoul@...nel.org>
Subject: [PATCH v3 05/17] usb: typec: Add device managed typec_switch_register()

Simplify driver error paths by adding devm_typec_switch_register() which
will unregister the typec switch when the parent device is unbound.

Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: <linux-usb@...r.kernel.org>
Cc: Pin-yen Lin <treapking@...omium.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/usb/typec/mux.c       | 27 +++++++++++++++++++++++++++
 include/linux/usb/typec_mux.h |  9 +++++++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
index 65c60eb56428..3531ab03bac4 100644
--- a/drivers/usb/typec/mux.c
+++ b/drivers/usb/typec/mux.c
@@ -235,6 +235,33 @@ void typec_switch_unregister(struct typec_switch_dev *sw_dev)
 }
 EXPORT_SYMBOL_GPL(typec_switch_unregister);
 
+static void devm_typec_switch_unregister(struct device *dev, void *switch_dev)
+{
+	typec_switch_unregister(*(struct typec_switch_dev **)switch_dev);
+}
+
+struct typec_switch_dev *
+devm_typec_switch_register(struct device *parent,
+			   const struct typec_switch_desc *desc)
+{
+	struct typec_switch_dev **ptr, *switch_dev;
+
+	ptr = devres_alloc(devm_typec_switch_unregister, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	switch_dev = typec_switch_register(parent ,desc);
+	if (!IS_ERR(switch_dev)) {
+		*ptr = switch_dev;
+		devres_add(parent, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return switch_dev;
+}
+EXPORT_SYMBOL_GPL(devm_typec_switch_register);
+
 void typec_switch_set_drvdata(struct typec_switch_dev *sw_dev, void *data)
 {
 	dev_set_drvdata(&sw_dev->dev, data);
diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h
index c6f49756530d..fe7a05dd71c8 100644
--- a/include/linux/usb/typec_mux.h
+++ b/include/linux/usb/typec_mux.h
@@ -34,6 +34,9 @@ int typec_switch_set(struct typec_switch *sw,
 struct typec_switch_dev *
 typec_switch_register(struct device *parent,
 		      const struct typec_switch_desc *desc);
+struct typec_switch_dev *
+devm_typec_switch_register(struct device *parent,
+			   const struct typec_switch_desc *desc);
 void typec_switch_unregister(struct typec_switch_dev *sw);
 
 void typec_switch_set_drvdata(struct typec_switch_dev *sw, void *data);
@@ -59,6 +62,12 @@ typec_switch_register(struct device *parent,
 {
 	return ERR_PTR(-EOPNOTSUPP);
 }
+static inline struct typec_switch_dev *
+devm_typec_switch_register(struct device *parent,
+			   const struct typec_switch_desc *desc)
+{
+	return typec_switch_register(parent, desc);
+}
 static inline void typec_switch_unregister(struct typec_switch_dev *sw) {}
 
 static inline void typec_switch_set_drvdata(struct typec_switch_dev *sw, void *data) {}
-- 
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