change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/drivers/usb/gadget/usbstring.c
..
..
@@ -65,3 +65,27 @@
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 	return buf [0];
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 }
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 EXPORT_SYMBOL_GPL(usb_gadget_get_string);
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+
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+/**
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+ * usb_validate_langid - validate usb language identifiers
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+ * @langid: usb language identifier
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+ *
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+ * Returns true for valid language identifier, otherwise false.
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+ */
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+bool usb_validate_langid(u16 langid)
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+{
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+	u16 primary_lang = langid & 0x3ff;	/* bit [9:0] */
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+	u16 sub_lang = langid >> 10;		/* bit [15:10] */
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+
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+	switch (primary_lang) {
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+	case 0:
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+	case 0x62 ... 0xfe:
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+	case 0x100 ... 0x3ff:
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+		return false;
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+	}
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+	if (!sub_lang)
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+		return false;
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+
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+	return true;
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+}
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+EXPORT_SYMBOL_GPL(usb_validate_langid);