Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 126 insertions, 0 deletions

diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
new file mode 100644
index 000000000..b5deafd91
--- /dev/null
+++ b/include/linux/usb/role.h
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef __LINUX_USB_ROLE_H
+#define __LINUX_USB_ROLE_H
+
+#include <linux/device.h>
+
+struct usb_role_switch;
+
+enum usb_role {
+	USB_ROLE_NONE,
+	USB_ROLE_HOST,
+	USB_ROLE_DEVICE,
+};
+
+typedef int (*usb_role_switch_set_t)(struct usb_role_switch *sw,
+				     enum usb_role role);
+typedef enum usb_role (*usb_role_switch_get_t)(struct usb_role_switch *sw);
+
+/**
+ * struct usb_role_switch_desc - USB Role Switch Descriptor
+ * @fwnode: The device node to be associated with the role switch
+ * @usb2_port: Optional reference to the host controller port device (USB2)
+ * @usb3_port: Optional reference to the host controller port device (USB3)
+ * @udc: Optional reference to the peripheral controller device
+ * @set: Callback for setting the role
+ * @get: Callback for getting the role (optional)
+ * @allow_userspace_control: If true userspace may change the role through sysfs
+ * @driver_data: Private data pointer
+ * @name: Name for the switch (optional)
+ *
+ * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB
+ * device controller behind the USB connector with the role switch. If
+ * @usb2_port, @usb3_port and @udc are included in the description, the
+ * reference count for them should be incremented by the caller of
+ * usb_role_switch_register() before registering the switch.
+ */
+struct usb_role_switch_desc {
+	struct fwnode_handle *fwnode;
+	struct device *usb2_port;
+	struct device *usb3_port;
+	struct device *udc;
+	usb_role_switch_set_t set;
+	usb_role_switch_get_t get;
+	bool allow_userspace_control;
+	void *driver_data;
+	const char *name;
+};
+
+
+#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
+int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
+enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
+struct usb_role_switch *usb_role_switch_get(struct device *dev);
+struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
+void usb_role_switch_put(struct usb_role_switch *sw);
+
+struct usb_role_switch *
+usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode);
+
+struct usb_role_switch *
+usb_role_switch_register(struct device *parent,
+			 const struct usb_role_switch_desc *desc);
+void usb_role_switch_unregister(struct usb_role_switch *sw);
+
+void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data);
+void *usb_role_switch_get_drvdata(struct usb_role_switch *sw);
+const char *usb_role_string(enum usb_role role);
+#else
+static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
+		enum usb_role role)
+{
+	return 0;
+}
+
+static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
+{
+	return USB_ROLE_NONE;
+}
+
+static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *node)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
+
+static inline struct usb_role_switch *
+usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
+{
+	return NULL;
+}
+
+static inline struct usb_role_switch *
+usb_role_switch_register(struct device *parent,
+			 const struct usb_role_switch_desc *desc)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
+
+static inline void
+usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
+{
+}
+
+static inline void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
+{
+	return NULL;
+}
+
+static inline const char *usb_role_string(enum usb_role role)
+{
+	return "unknown";
+}
+
+#endif
+
+#endif /* __LINUX_USB_ROLE_H */