Add samsung specific changes

include/linux/usb/redriver.h

@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __LINUX_USB_REDRIVER_H
+#define __LINUX_USB_REDRIVER_H
+
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/of.h>
+
+/*
+ * design rules,
+ * [a] assume pullup operation happen in kretprobe.
+ *     in kretprobe function, mutex lock is not allowed;
+ *     in kretprobe function, schedule_work() is allowed;
+ * [b] this is core driver which service lower redriver and upper user.
+ * [c] redriver must probe early than user, or not user will defer probe.
+ * [d] redriver can rmmod only when there is no user bind to it.
+ * [e] if user rmmod, redirver will change to default state.
+ * [f] if redriver module insmod after new change and build,
+ *     user module also need insmod to work.
+ * [g] when a redriver probe, set to disable state, all control from user.
+ *     as ssphy have no eud function which don't need to keep working.
+ * [h] user should be ssphy, but current user is dwc3,
+ *     as seem some redriver have termination issue,
+ *     it need to do pullup operation from controller driver.
+ */
+
+
+#define ORIENTATION_CC1		0
+#define ORIENTATION_CC2		1
+
+/**
+ * struct usb_redriver - present a redriver chip
+ * @list: link all redriver chips
+ * @of_node: redriver chip device tree node
+ * @release_usb_lanes: put redriver into 2/4 lanes display mode
+ * @notify_connect: cable connect
+ * @notify_disconnect: cable disconnect
+ * @gadget_pullup_enter: operation when enter gadget pullup function
+ * @gadget_pullup_exit: operation when exit gadget pullup function
+ * @host_powercycle: workaround for host otg case
+ * @unbind, change to default state when user unbind it
+ * @bounded,  bound to user or not
+ */
+struct usb_redriver {
+	struct list_head list;
+	struct device_node *of_node;
+
+	int (*release_usb_lanes)(struct usb_redriver *ur, int ort, int num);
+	int (*notify_connect)(struct usb_redriver *ur, int ort);
+	int (*notify_disconnect)(struct usb_redriver *ur);
+	int (*gadget_pullup_enter)(struct usb_redriver *ur, int is_on);
+	int (*gadget_pullup_exit)(struct usb_redriver *ur, int is_on);
+	int (*host_powercycle)(struct usb_redriver *ur);
+	void (*unbind)(struct usb_redriver *ur);
+
+	bool bounded;
+};
+
+#if IS_ENABLED(CONFIG_USB_REDRIVER)
+int usb_add_redriver(struct usb_redriver *ur);
+int usb_remove_redriver(struct usb_redriver *ur);
+
+struct usb_redriver *usb_get_redriver_by_phandle(
+		const struct device_node *np,
+		const char *phandle_name, int index);
+void usb_put_redriver(struct usb_redriver *ur);
+void usb_redriver_release_lanes(struct usb_redriver *ur, int ort, int num);
+void usb_redriver_notify_connect(struct usb_redriver *ur, int ort);
+void usb_redriver_notify_disconnect(struct usb_redriver *ur);
+void usb_redriver_gadget_pullup_enter(struct usb_redriver *ur, int is_on);
+void usb_redriver_gadget_pullup_exit(struct usb_redriver *ur, int is_on);
+void usb_redriver_host_powercycle(struct usb_redriver *ur);
+
+#else
+
+static inline int usb_add_redriver(struct usb_redriver *ur)
+{
+	return 0;
+}
+
+static inline struct usb_redriver *usb_get_redriver_by_phandle(
+		const struct device_node *np,
+		const char *phandle_name, int index)
+{
+	return NULL;
+}
+
+static inline int usb_remove_redriver(struct usb_redriver *ur)
+{
+	return 0;
+}
+
+#define usb_put_redriver(ur) do {} while (0)
+
+#define usb_redriver_release_lanes(ur, ort, num) do {} while (0)
+#define usb_redriver_notify_connect(ur, ort) do {} while (0)
+#define usb_redriver_notify_disconnect(ur) do {} while (0)
+#define usb_redriver_gadget_pullup_enter(ur, is_on) do {} while (0)
+#define usb_redriver_gadget_pullup_exit(ur, is_on) do {} while (0)
+#define usb_redriver_host_powercycle(ur) do {} while (0)
+
+#endif
+
+#endif /*__LINUX_USB_REDRIVER_H */