usb_cdc: Allow USB endpoint ids to be board specific

It's common for boards to have restrictions on the type of each
endpoint.  So, make it possible for the board to select the endpoint
ids for each endpoint.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/generic/usb_cdc.c

@@ -6,12 +6,13 @@
 
 #include <string.h> // memmove
 #include "board/pgm.h" // PROGMEM
-#include "board/usb_cdc.h" // usb_notify_setup
+#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
 #include "byteorder.h" // cpu_to_le16
 #include "command.h" // output
 #include "generic/usbstd.h" // struct usb_device_descriptor
 #include "generic/usbstd_cdc.h" // struct usb_cdc_header_descriptor
 #include "sched.h" // sched_wake_task
+#include "usb_cdc.h" // usb_notify_setup
 
 // XXX - move to Kconfig
 #define CONFIG_USB_VENDOR_ID 0x2341

src/generic/usb_cdc.h

@@ -3,17 +3,11 @@
 
 #include <stdint.h> // uint_fast8_t
 
+// endpoint sizes
 enum {
     USB_CDC_EP0_SIZE = 16,
-
-    // XXX - endpoint ids may need to changed per-board
-    USB_CDC_EP_ACM = 1,
     USB_CDC_EP_ACM_SIZE = 8,
-
-    USB_CDC_EP_BULK_OUT = 2,
     USB_CDC_EP_BULK_OUT_SIZE = 64,
-
-    USB_CDC_EP_BULK_IN = 5,
     USB_CDC_EP_BULK_IN_SIZE = 64,
 };
 

src/generic/usb_cdc_ep.h

@@ -0,0 +1,11 @@
+#ifndef __GENERIC_USB_CDC_EP_H
+#define __GENERIC_USB_CDC_EP_H
+
+// Default USB endpoint ids
+enum {
+    USB_CDC_EP_ACM = 1,
+    USB_CDC_EP_BULK_OUT = 2,
+    USB_CDC_EP_BULK_IN = 3,
+};
+
+#endif // usb_cdc_ep.h