[PATCH 3/4] usb: typec: add typec orientation switch support via mux controller

[Li Jun]

Some dedicated mux block can use existing mux controller as a
mux provider, typec port as a consumer to select channel for
orientation switch, this can be an alternate way to current
typec_switch interface.

Signed-off-by: Li Jun <jun.li at nxp.com>
---
 drivers/usb/typec/class.c     | 26 +++++++++++++++++++++++++-
 drivers/usb/typec/class.h     |  2 ++
 drivers/usb/typec/mux.c       | 34 ++++++++++++++++++++++++++++++++++
 include/linux/usb/typec_mux.h |  4 ++++
 4 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index a29bf2c32233..1bb0275e6204 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1601,6 +1601,7 @@ static void typec_release(struct device *dev)
 	ida_simple_remove(&typec_index_ida, port->id);
 	ida_destroy(&port->mode_ids);
 	typec_switch_put(port->sw);
+	typec_mux_control_switch_put(port->mux_control_switch);
 	typec_mux_put(port->mux);
 	kfree(port->cap);
 	kfree(port);
@@ -1816,6 +1817,13 @@ int typec_set_orientation(struct typec_port *port,
 	if (ret)
 		return ret;
 
+	if (!port->sw) {
+		ret = typec_mux_control_switch_set(port->mux_control_switch,
+				port->mux_control_switch_states[orientation]);
+		if (ret)
+			return ret;
+	}
+
 	port->orientation = orientation;
 	sysfs_notify(&port->dev.kobj, NULL, "orientation");
 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
@@ -1991,7 +1999,7 @@ struct typec_port *typec_register_port(struct device *parent,
 				       const struct typec_capability *cap)
 {
 	struct typec_port *port;
-	int ret;
+	int ret = 0;
 	int id;
 
 	port = kzalloc(sizeof(*port), GFP_KERNEL);
@@ -2068,6 +2076,22 @@ struct typec_port *typec_register_port(struct device *parent,
 		return ERR_PTR(ret);
 	}
 
+	if (!port->sw) {
+		/* Try to get typec switch via general mux controller */
+		port->mux_control_switch = typec_mux_control_switch_get(&port->dev);
+		if (IS_ERR(port->mux_control_switch))
+			ret = PTR_ERR(port->mux_control_switch);
+		else if (port->mux_control_switch)
+			ret = device_property_read_u32_array(&port->dev,
+					"mux-control-switch-states",
+					port->mux_control_switch_states,
+					3);
+		if (ret) {
+			put_device(&port->dev);
+			return ERR_PTR(ret);
+		}
+	}
+
 	port->mux = typec_mux_get(&port->dev, NULL);
 	if (IS_ERR(port->mux)) {
 		ret = PTR_ERR(port->mux);
diff --git a/drivers/usb/typec/class.h b/drivers/usb/typec/class.h
index aef03eb7e152..15dad2621c83 100644
--- a/drivers/usb/typec/class.h
+++ b/drivers/usb/typec/class.h
@@ -50,6 +50,8 @@ struct typec_port {
 
 	enum typec_orientation		orientation;
 	struct typec_switch		*sw;
+	struct mux_control		*mux_control_switch;
+	int				mux_control_switch_states[3];
 	struct typec_mux		*mux;
 
 	const struct typec_capability	*cap;
diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
index 9da22ae3006c..6c5c4f07286d 100644
--- a/drivers/usb/typec/mux.c
+++ b/drivers/usb/typec/mux.c
@@ -11,6 +11,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/mux/consumer.h>
 #include <linux/property.h>
 #include <linux/slab.h>
 
@@ -176,6 +177,39 @@ void *typec_switch_get_drvdata(struct typec_switch *sw)
 }
 EXPORT_SYMBOL_GPL(typec_switch_get_drvdata);
 
+struct mux_control *typec_mux_control_switch_get(struct device *dev)
+{
+	if (!device_property_present(dev, "mux-control-names"))
+		return NULL;
+
+	return mux_control_get(dev, "typec-orientation-switch");
+}
+EXPORT_SYMBOL_GPL(typec_mux_control_switch_get);
+
+int typec_mux_control_switch_set(struct mux_control *mc_sw, int state)
+{
+	int ret;
+
+	if (!mc_sw)
+		return 0;
+
+	ret = mux_control_deselect(mc_sw);
+	if (ret)
+		return ret;
+
+	return mux_control_select(mc_sw, state);
+}
+EXPORT_SYMBOL_GPL(typec_mux_control_switch_set);
+
+void typec_mux_control_switch_put(struct mux_control *mc_sw)
+{
+	if (!mc_sw)
+		return;
+
+	return mux_control_put(mc_sw);
+}
+EXPORT_SYMBOL_GPL(typec_mux_control_switch_put);
+
 /* ------------------------------------------------------------------------- */
 
 static int mux_fwnode_match(struct device *dev, const void *fwnode)
diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h
index a9d9957933dc..e0933e205b80 100644
--- a/include/linux/usb/typec_mux.h
+++ b/include/linux/usb/typec_mux.h
@@ -27,6 +27,10 @@ void typec_switch_put(struct typec_switch *sw);
 int typec_switch_set(struct typec_switch *sw,
 		     enum typec_orientation orientation);
 
+struct mux_control *typec_mux_control_switch_get(struct device *dev);
+int typec_mux_control_switch_set(struct mux_control *mc_sw, int state);
+void typec_mux_control_switch_put(struct mux_control *mc_sw);
+
 static inline struct typec_switch *typec_switch_get(struct device *dev)
 {
 	return fwnode_typec_switch_get(dev_fwnode(dev));
-- 
2.25.1