Add system keyboard interface and add sleep, power and wake keys.

right/src/usb_interfaces/usb_interface_system_keyboard.h

@@ -0,0 +1,44 @@
+#ifndef __USB_INTERFACE_SYSTEM_KEYBOARD_H__
+#define __USB_INTERFACE_SYSTEM_KEYBOARD_H__
+
+// Includes:
+
+    #include "fsl_common.h"
+    #include "usb_api.h"
+    #include "usb_descriptors/usb_descriptor_system_keyboard_report.h"
+
+// Macros:
+
+    #define USB_SYSTEM_KEYBOARD_INTERFACE_INDEX 4
+    #define USB_SYSTEM_KEYBOARD_INTERFACE_COUNT 1
+
+    #define USB_SYSTEM_KEYBOARD_ENDPOINT_INDEX 6
+    #define USB_SYSTEM_KEYBOARD_ENDPOINT_COUNT 1
+
+    #define USB_SYSTEM_KEYBOARD_INTERRUPT_IN_PACKET_SIZE 1
+    #define USB_SYSTEM_KEYBOARD_INTERRUPT_IN_INTERVAL 4
+
+    #define USB_SYSTEM_KEYBOARD_REPORT_LENGTH 1
+
+// Typedefs:
+
+    typedef struct {
+        uint8_t scancodes[USB_SYSTEM_KEYBOARD_MAX_KEYS];
+    } __attribute__ ((packed)) usb_system_keyboard_report_t;
+
+// Variables:
+
+    extern bool IsUsbSystemKeyboardReportSent;
+    extern usb_device_class_struct_t UsbSystemKeyboardClass;
+    extern usb_system_keyboard_report_t* ActiveUsbSystemKeyboardReport;
+
+// Functions:
+
+    extern usb_status_t UsbSystemKeyboardCallback(class_handle_t handle, uint32_t event, void *param);
+    extern usb_status_t UsbSystemKeyboardSetConfiguration(class_handle_t handle, uint8_t configuration);
+    extern usb_status_t UsbSystemKeyboardSetInterface(class_handle_t handle, uint8_t interface, uint8_t alternateSetting);
+
+    extern void ResetActiveUsbSystemKeyboardReport();
+    extern void SwitchActiveUsbSystemKeyboardReport();
+
+#endif