--- linux-4.9.37/drivers/usb/dwc3/proc.c	1970-01-01 03:00:00.000000000 +0300
+++ linux-4.9.y/drivers/usb/dwc3/proc.c	2021-06-07 13:01:34.000000000 +0300
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) Hunan Goke,Chengdu Goke,Shandong Goke. 2021. All rights reserved.
+ */
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include "core.h"
+
+#define DWC3_PROC_ROOT "dwc3"
+#define DWC3_PROC_CONNECTED_STATUS "csts"
+
+static struct proc_dir_entry *proc_dwc3_dir = NULL;
+static int proc_dwc3_dir_cnt = 0;
+
+static void dwc3_stats_seq_printout(struct seq_file *s)
+{
+	struct dwc3 *dwc = s->private;
+
+	switch (dwc->udc_connect_status) {
+	case UDC_CONNECT_HOST:
+		seq_puts(s, "cnt2host\n");
+		break;
+	case UDC_CONNECT_CHARGER:
+		seq_puts(s, "cnt2charger\n");
+		break;
+	default:
+		seq_puts(s, "disconnected\n");
+		break;
+	}
+}
+
+/* define parameters where showed in proc file */
+static int dwc3_stats_seq_show(struct seq_file *s, void *v)
+{
+	if (s == NULL)
+		return -EINVAL;
+
+	dwc3_stats_seq_printout(s);
+	return 0;
+}
+
+/* proc file open */
+static int dwc3_stats_proc_open(struct inode *inode, struct file *file)
+{
+	if ((inode == NULL) || (file == NULL))
+		return -EINVAL;
+
+	return single_open(file, dwc3_stats_seq_show, PDE_DATA(inode));
+};
+
+/* proc file operation */
+static const struct file_operations dwc3_stats_proc_ops = {
+	.owner = THIS_MODULE,
+	.open = dwc3_stats_proc_open,
+	.read = seq_read,
+	.release = single_release,
+};
+
+int dwc3_proc_init(struct dwc3 *dwc)
+{
+	struct proc_dir_entry *proc_entry = NULL;
+
+	if (dwc == NULL)
+		return -EINVAL;
+
+	if (proc_dwc3_dir == NULL) {
+		proc_entry = proc_mkdir(DWC3_PROC_ROOT, NULL);
+		if (proc_entry == NULL) {
+			pr_err("%s: failed to create proc file %s\n",
+					__func__, DWC3_PROC_ROOT);
+			return 1;
+		}
+		proc_dwc3_dir = proc_entry;
+	}
+	proc_dwc3_dir_cnt++;
+
+	proc_entry = proc_mkdir(to_platform_device(dwc->dev)->name, proc_dwc3_dir);
+	if (proc_entry == NULL) {
+		pr_err("%s: failed to create proc file %s\n",
+				__func__, to_platform_device(dwc->dev)->name);
+		return -1;
+	}
+	dwc->parent_entry = proc_entry;
+
+	proc_entry = proc_create_data(DWC3_PROC_CONNECTED_STATUS,
+			0, dwc->parent_entry, &dwc3_stats_proc_ops, dwc);
+	if (proc_entry == NULL) {
+		pr_err("%s: failed to create proc file %s\n",
+				__func__, DWC3_PROC_CONNECTED_STATUS);
+		return -1;
+	}
+	dwc->csts_entry = proc_entry;
+
+	/*
+	 * add here if more proc information need.
+	 */
+	return 0;
+}
+
+int dwc3_proc_shutdown(struct dwc3 *dwc)
+{
+	if (proc_dwc3_dir != NULL) {
+		remove_proc_entry(DWC3_PROC_CONNECTED_STATUS, dwc->parent_entry);
+		remove_proc_entry(to_platform_device(dwc->dev)->name, proc_dwc3_dir);
+	}
+
+	if (proc_dwc3_dir_cnt)
+		proc_dwc3_dir_cnt--;
+
+	if (proc_dwc3_dir_cnt == 0) {
+		remove_proc_entry(DWC3_PROC_ROOT, NULL);
+		proc_dwc3_dir = NULL;
+	}
+
+	return 0;
+}