[acm] Add support for CDC-ACM (aka USB RNDIS) devices

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/include/ipxe/cdc.h b/src/include/ipxe/cdc.h
index f1799cd9a..b8b4a59d9 100644
--- a/src/include/ipxe/cdc.h
+++ b/src/include/ipxe/cdc.h
@@ -14,6 +14,16 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 /** Class code for communications devices */
 #define USB_CLASS_CDC 2
 
+/** Send encapsulated command */
+#define CDC_SEND_ENCAPSULATED_COMMAND					\
+	( USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE |		\
+	  USB_REQUEST_TYPE ( 0x00 ) )
+
+/** Get encapsulated response */
+#define CDC_GET_ENCAPSULATED_RESPONSE					\
+	( USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE |		\
+	  USB_REQUEST_TYPE ( 0x01 ) )
+
 /** Union functional descriptor */
 struct cdc_union_descriptor {
 	/** Descriptor header */
@@ -30,6 +40,11 @@ struct cdc_union_descriptor {
 /** Ethernet descriptor subtype */
 #define CDC_SUBTYPE_ETHERNET 15
 
+/** Response available */
+#define CDC_RESPONSE_AVAILABLE						\
+	( USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE |		\
+	  USB_REQUEST_TYPE ( 0x01 ) )
+
 /** Network connection notification */
 #define CDC_NETWORK_CONNECTION						\
 	( USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE |		\
@@ -52,4 +67,38 @@ extern struct cdc_union_descriptor *
 cdc_union_descriptor ( struct usb_configuration_descriptor *config,
 		       struct usb_interface_descriptor *interface );
 
+/**
+ * Send encapsulated command
+ *
+ * @v usb		USB device
+ * @v interface		Interface number
+ * @v data		Command
+ * @v len		Length of command
+ * @ret rc		Return status code
+ */
+static inline __attribute__ (( always_inline )) int
+cdc_send_encapsulated_command ( struct usb_device *usb, unsigned int interface,
+				void *data, size_t len ) {
+
+	return usb_control ( usb, CDC_SEND_ENCAPSULATED_COMMAND, 0, interface,
+			     data, len );
+}
+
+/**
+* Get encapsulated response
+*
+* @v usb		USB device
+* @v interface		Interface number
+* @v data		Response buffer
+* @v len		Length of response buffer
+* @ret rc		Return status code
+*/
+static inline __attribute__ (( always_inline )) int
+cdc_get_encapsulated_response ( struct usb_device *usb, unsigned int interface,
+				void *data, size_t len ) {
+
+	return usb_control ( usb, CDC_GET_ENCAPSULATED_RESPONSE, 0, interface,
+			     data, len );
+}
+
 #endif /* _IPXE_CDC_H */