sys/usbus: define the number of required EPs for each class

To be able to check during compilation that the number of endpoints provided by a USB peripheral is not exceeded, each interface class has to define the number of IN and OUT endpoints it requires.

sys/include/usb/hid.h

@@ -83,6 +83,16 @@ extern "C" {
 #define USB_HID_REQUEST_SET_PROTOCOL  0x0b
 /** @} */
 
+/**
+ * @brief   Number of IN EPs required for the HID interface
+ */
+#define USBUS_HID_EP_IN_REQUIRED_NUMOF   1
+
+/**
+ * @brief   Number of Out EPs required for the HID interface
+ */
+#define USBUS_HID_EP_OUT_REQUIRED_NUMOF  1
+
 /**
  * @brief USB HID descriptor struct
  *

sys/include/usb/usbus/cdc/acm.h

@@ -89,6 +89,16 @@ extern "C" {
  */
 #define USBUS_CDC_ACM_INT_EP_SIZE      (8)
 
+/**
+ * @brief Number of IN EPs required for the CDC ACM interface
+ */
+#define USBUS_CDC_ACM_EP_IN_REQUIRED_NUMOF   2
+
+/**
+ * @brief Number of Out EPs required for the CDC ACM interface
+ */
+#define USBUS_CDC_ACM_EP_OUT_REQUIRED_NUMOF  1
+
 /**
  * @brief CDC ACM line state as reported by the host computer
  */

sys/include/usb/usbus/cdc/ecm.h

@@ -87,6 +87,16 @@ extern "C" {
  */
 #define USBUS_ETHERNET_FRAME_BUF   MATH_ALIGN(ETHERNET_FRAME_LEN, USBUS_CDCECM_EP_DATA_SIZE)
 
+/**
+ * @brief Number of IN EPs required for the CDC ECM interface
+ */
+#define USBUS_CDC_ECM_EP_IN_REQUIRED_NUMOF   2
+
+/**
+ * @brief Number of Out EPs required for the CDC ECM interface
+ */
+#define USBUS_CDC_ECM_EP_OUT_REQUIRED_NUMOF  1
+
 /**
  * @brief notification state, used to track which information must be send to
  * the host

sys/include/usb/usbus/control.h

@@ -21,6 +21,16 @@
 #ifndef USB_USBUS_CONTROL_H
 #define USB_USBUS_CONTROL_H
 
+/**
+ * @brief   Number of IN EPs required for the control interface
+ */
+#define USBUS_CONTROL_EP_IN_REQUIRED_NUMOF  1
+
+/**
+ * @brief   Number of IN EPs required for the control interface
+ */
+#define USBUS_CONTROL_EP_OUT_REQUIRED_NUMOF 1
+
 #include "usb/usbus.h"
 
 #ifdef __cplusplus

sys/include/usb/usbus/msc.h

@@ -31,6 +31,16 @@
 extern "C" {
 #endif
 
+/**
+ * @brief Number of IN EPs required for the MSC interface
+ */
+#define USBUS_MSC_EP_IN_REQUIRED_NUMOF   1
+
+/**
+ * @brief Number of Out EPs required for the MSC interface
+ */
+#define USBUS_MSC_EP_OUT_REQUIRED_NUMOF  1
+
 /**
  * @brief USBUS MSC Number of exported MTD device through USB
  */