+#ifdef CONFIG_COMPAT
+
+struct input_event_compat {
+ struct compat_timeval time;
+ __u16 type;
+ __u16 code;
+ __s32 value;
+};
+
+/* Note to the author of this code: did it ever occur to
+ you why the ifdefs are needed? Think about it again. -AK */
+#ifdef CONFIG_X86_64
+# define COMPAT_TEST is_compat_task()
+#elif defined(CONFIG_IA64)
+# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
+#elif defined(CONFIG_S390)
+# define COMPAT_TEST test_thread_flag(TIF_31BIT)
+#elif defined(CONFIG_MIPS)
+# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
+#else
+# define COMPAT_TEST test_thread_flag(TIF_32BIT)
+#endif
+
+static inline size_t evdev_event_size(void)
+{
+ return COMPAT_TEST ?
+ sizeof(struct input_event_compat) : sizeof(struct input_event);
+}
+
+static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
+{
+ if (COMPAT_TEST) {
+ struct input_event_compat compat_event;
+
+ if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
+ return -EFAULT;
+
+ event->time.tv_sec = compat_event.time.tv_sec;
+ event->time.tv_usec = compat_event.time.tv_usec;
+ event->type = compat_event.type;
+ event->code = compat_event.code;
+ event->value = compat_event.value;
+
+ } else {
+ if (copy_from_user(event, buffer, sizeof(struct input_event)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
+{
+ if (COMPAT_TEST) {
+ struct input_event_compat compat_event;
+
+ compat_event.time.tv_sec = event->time.tv_sec;
+ compat_event.time.tv_usec = event->time.tv_usec;
+ compat_event.type = event->type;
+ compat_event.code = event->code;
+ compat_event.value = event->value;
+
+ if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
+ return -EFAULT;
+
+ } else {
+ if (copy_to_user(buffer, event, sizeof(struct input_event)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+#else
+
+static inline size_t evdev_event_size(void)
+{
+ return sizeof(struct input_event);
+}
+
+static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
+{
+ if (copy_from_user(event, buffer, sizeof(struct input_event)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
+{
+ if (copy_to_user(buffer, event, sizeof(struct input_event)))
+ return -EFAULT;
+
+ return 0;
+}
+
+#endif /* CONFIG_COMPAT */
+