1 files changed, 61 insertions, 0 deletions
diff --git a/backport-include/linux/usb/cdc.h b/backport-include/linux/usb/cdc.h
new file mode 100644
index 0000000..5ad31bf
--- /dev/null
+++ b/backport-include/linux/usb/cdc.h
@@ -0,0 +1,61 @@
+#ifndef __BP_USB_CDC_H
+#define __BP_USB_CDC_H
+#include <linux/version.h>
+
+#if LINUX_VERSION_IS_GEQ(4,8,0)
+#include_next <linux/usb/cdc.h>
+#else
+#include <uapi/linux/usb/cdc.h>
+
+/*
+ * inofficial magic numbers
+ */
+
+#define CDC_PHONET_MAGIC_NUMBER		0xAB
+
+#ifndef USB_CDC_MBIM_EXTENDED_TYPE
+#define USB_CDC_MBIM_EXTENDED_TYPE 0x1c
+
+/* "MBIM Extended Functional Descriptor" from CDC MBIM spec 1.0 errata-1 */
+struct usb_cdc_mbim_extended_desc {
+	__u8	bLength;
+	__u8	bDescriptorType;
+	__u8	bDescriptorSubType;
+
+	__le16	bcdMBIMExtendedVersion;
+	__u8	bMaxOutstandingCommandMessages;
+	__le16	wMTU;
+} __attribute__ ((packed));
+#endif
+
+/*
+ * parsing CDC headers
+ */
+
+struct usb_cdc_parsed_header {
+	struct usb_cdc_union_desc *usb_cdc_union_desc;
+	struct usb_cdc_header_desc *usb_cdc_header_desc;
+
+	struct usb_cdc_call_mgmt_descriptor *usb_cdc_call_mgmt_descriptor;
+	struct usb_cdc_acm_descriptor *usb_cdc_acm_descriptor;
+	struct usb_cdc_country_functional_desc *usb_cdc_country_functional_desc;
+	struct usb_cdc_network_terminal_desc *usb_cdc_network_terminal_desc;
+	struct usb_cdc_ether_desc *usb_cdc_ether_desc;
+	struct usb_cdc_dmm_desc *usb_cdc_dmm_desc;
+	struct usb_cdc_mdlm_desc *usb_cdc_mdlm_desc;
+	struct usb_cdc_mdlm_detail_desc *usb_cdc_mdlm_detail_desc;
+	struct usb_cdc_obex_desc *usb_cdc_obex_desc;
+	struct usb_cdc_ncm_desc *usb_cdc_ncm_desc;
+	struct usb_cdc_mbim_desc *usb_cdc_mbim_desc;
+	struct usb_cdc_mbim_extended_desc *usb_cdc_mbim_extended_desc;
+
+	bool phonet_magic_present;
+};
+
+#define cdc_parse_cdc_header LINUX_BACKPORT(cdc_parse_cdc_header)
+int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr,
+			 struct usb_interface *intf,
+			 u8 *buffer, int buflen);
+#endif
+
+#endif /* __BP_USB_CDC_H */