Suspend process waiting for keyboard input

kernel/device/device.h

@@ -2,10 +2,13 @@
 #define _KERNEL_DEVICE_DEVICE_H
 
 #include <libk/rbtree.h>
+#include <libk/std.h>
 #include <proc/proc.h>
 #include <sync/spin_lock.h>
+#include <sys/smp.h>
 
-typedef int (*device_op_func_t) (struct proc* proc, void* a1, void* a2, void* a3, void* a4);
+typedef bool (*device_op_func_t) (struct proc* proc, struct cpu** reschedule_cpu, int* ret,
+                                  void* a1, void* a2, void* a3, void* a4);
 
 struct device {
   int id;