From 04dd17822334871b23ea2862f7798fb0e0007777 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 11 May 2024 08:53:19 +0000
Subject: [PATCH] change otg to host mode
---
kernel/drivers/usb/gadget/usbstring.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/kernel/drivers/usb/gadget/usbstring.c b/kernel/drivers/usb/gadget/usbstring.c
index 33f77e59a..75f6f99 100644
--- a/kernel/drivers/usb/gadget/usbstring.c
+++ b/kernel/drivers/usb/gadget/usbstring.c
@@ -65,3 +65,27 @@
return buf [0];
}
EXPORT_SYMBOL_GPL(usb_gadget_get_string);
+
+/**
+ * usb_validate_langid - validate usb language identifiers
+ * @langid: usb language identifier
+ *
+ * Returns true for valid language identifier, otherwise false.
+ */
+bool usb_validate_langid(u16 langid)
+{
+ u16 primary_lang = langid & 0x3ff; /* bit [9:0] */
+ u16 sub_lang = langid >> 10; /* bit [15:10] */
+
+ switch (primary_lang) {
+ case 0:
+ case 0x62 ... 0xfe:
+ case 0x100 ... 0x3ff:
+ return false;
+ }
+ if (!sub_lang)
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(usb_validate_langid);
--
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