usb: typec: Set the bus also for the port and plug altmodes

The port and plug altmodes can't be bound to the altmode
drivers because the altmode drivers are meant for partner
communication using the VDM (vendor defined messages), but
they can still be part of the bus. The bus will make sure
that the normal bus notifications are available also with
the port altmodes.

The previously used common device type for all alternate
modes is replaced with separate dedicated device types for
port, plug, and partner alternate modes.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
Link: https://patch.msgid.link/20251208015500.94-2-kernel@airkyi.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
index a884cec9ab7e88ae2a9f971121470119a2584bff..a33da7f458a524950812248d26d38796a5d48791 100644 (file)
--- a/drivers/usb/typec/bus.c
+++ b/drivers/usb/typec/bus.c
@@ -445,7 +445,23 @@ static struct attribute *typec_attrs[] = {
        &dev_attr_description.attr,
        NULL
 };
-ATTRIBUTE_GROUPS(typec);
+
+static umode_t typec_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+       if (is_typec_partner_altmode(kobj_to_dev(kobj)))
+               return attr->mode;
+       return 0;
+}
+
+static const struct attribute_group typec_group = {
+       .is_visible = typec_is_visible,
+       .attrs = typec_attrs,
+};
+
+static const struct attribute_group *typec_groups[] = {
+       &typec_group,
+       NULL
+};
 
 static int typec_match(struct device *dev, const struct device_driver *driver)
 {
@@ -453,6 +469,9 @@ static int typec_match(struct device *dev, const struct device_driver *driver)
        struct typec_altmode *altmode = to_typec_altmode(dev);
        const struct typec_device_id *id;
 
+       if (!is_typec_partner_altmode(dev))
+               return 0;
+
        for (id = drv->id_table; id->svid; id++)
                if (id->svid == altmode->svid)
                        return 1;
@@ -463,6 +482,9 @@ static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
        const struct typec_altmode *altmode = to_typec_altmode(dev);
 
+       if (!is_typec_partner_altmode(dev))
+               return 0;
+
        if (add_uevent_var(env, "SVID=%04X", altmode->svid))
                return -ENOMEM;
 

diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h
index 643b8c81786dfe2e6f741f803c744e0ea9937155..b58e131450d11c8858f4a6b0998e4931031389cf 100644 (file)
--- a/drivers/usb/typec/bus.h
+++ b/drivers/usb/typec/bus.h
@@ -29,8 +29,12 @@ struct altmode {
 #define to_altmode(d) container_of(d, struct altmode, adev)
 
 extern const struct bus_type typec_bus;
-extern const struct device_type typec_altmode_dev_type;
+extern const struct device_type typec_port_altmode_dev_type;
+extern const struct device_type typec_plug_altmode_dev_type;
+extern const struct device_type typec_partner_altmode_dev_type;
 
-#define is_typec_altmode(_dev_) (_dev_->type == &typec_altmode_dev_type)
+#define is_typec_port_altmode(dev) ((dev)->type == &typec_port_altmode_dev_type)
+#define is_typec_plug_altmode(dev) ((dev)->type == &typec_plug_altmode_dev_type)
+#define is_typec_partner_altmode(dev) ((dev)->type == &typec_partner_altmode_dev_type)
 
 #endif /* __USB_TYPEC_ALTMODE_H__ */

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9b2647cb199b049c0b2e81bd0d122ccd5a39b06c..d6b88317f8a4bf6edac0f8081da0c9dfa59acaa1 100644 (file)
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -235,7 +235,7 @@ static int altmode_match(struct device *dev, const void *data)
        struct typec_altmode *adev = to_typec_altmode(dev);
        const struct typec_device_id *id = data;
 
-       if (!is_typec_altmode(dev))
+       if (!is_typec_port_altmode(dev))
                return 0;
 
        return (adev->svid == id->svid);
@@ -532,15 +532,28 @@ static void typec_altmode_release(struct device *dev)
        kfree(alt);
 }
 
-const struct device_type typec_altmode_dev_type = {
-       .name = "typec_alternate_mode",
+const struct device_type typec_port_altmode_dev_type = {
+       .name = "typec_port_alternate_mode",
+       .groups = typec_altmode_groups,
+       .release = typec_altmode_release,
+};
+
+const struct device_type typec_plug_altmode_dev_type = {
+       .name = "typec_plug_alternate_mode",
+       .groups = typec_altmode_groups,
+       .release = typec_altmode_release,
+};
+
+const struct device_type typec_partner_altmode_dev_type = {
+       .name = "typec_partner_alternate_mode",
        .groups = typec_altmode_groups,
        .release = typec_altmode_release,
 };
 
 static struct typec_altmode *
 typec_register_altmode(struct device *parent,
-                      const struct typec_altmode_desc *desc)
+                      const struct typec_altmode_desc *desc,
+                      const struct device_type *type)
 {
        unsigned int id = altmode_id_get(parent);
        bool is_port = is_typec_port(parent);
@@ -575,7 +588,7 @@ typec_register_altmode(struct device *parent,
 
        alt->adev.dev.parent = parent;
        alt->adev.dev.groups = alt->groups;
-       alt->adev.dev.type = &typec_altmode_dev_type;
+       alt->adev.dev.type = type;
        dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
 
        get_device(alt->adev.dev.parent);
@@ -584,9 +597,7 @@ typec_register_altmode(struct device *parent,
        if (!is_port)
                typec_altmode_set_partner(alt);
 
-       /* The partners are bind to drivers */
-       if (is_typec_partner(parent))
-               alt->adev.dev.bus = &typec_bus;
+       alt->adev.dev.bus = &typec_bus;
 
        /* Plug alt modes need a class to generate udev events. */
        if (is_typec_plug(parent))
@@ -963,7 +974,7 @@ struct typec_altmode *
 typec_partner_register_altmode(struct typec_partner *partner,
                               const struct typec_altmode_desc *desc)
 {
-       return typec_register_altmode(&partner->dev, desc);
+       return typec_register_altmode(&partner->dev, desc, &typec_partner_altmode_dev_type);
 }
 EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
 
@@ -1193,7 +1204,7 @@ struct typec_altmode *
 typec_plug_register_altmode(struct typec_plug *plug,
                            const struct typec_altmode_desc *desc)
 {
-       return typec_register_altmode(&plug->dev, desc);
+       return typec_register_altmode(&plug->dev, desc, &typec_plug_altmode_dev_type);
 }
 EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
 
@@ -2493,7 +2504,7 @@ typec_port_register_altmode(struct typec_port *port,
                return ERR_CAST(retimer);
        }
 
-       adev = typec_register_altmode(&port->dev, desc);
+       adev = typec_register_altmode(&port->dev, desc, &typec_port_altmode_dev_type);
        if (IS_ERR(adev)) {
                typec_retimer_put(retimer);
                typec_mux_put(mux);