Add usb_check{recv,send}

Author: Extrems

gc/ogc/usbgecko.h

@@ -9,6 +9,8 @@
 
 void usb_flush(s32 chn);
 int usb_isgeckoalive(s32 chn);
+int usb_checkrecv(s32 chn);
+int usb_checksend(s32 chn);
 int usb_recvbuffer(s32 chn,void *buffer,int size);
 int usb_sendbuffer(s32 chn,const void *buffer,int size);
 int usb_recvbuffer_safe(s32 chn,void *buffer,int size);

libogc/usbgecko.c

@@ -87,7 +87,7 @@ static int __usb_recvbyte(s32 chn,char *ch)
 	return ret;
 }
 
-int __usb_checksend(s32 chn)
+static int __usb_checksend(s32 chn)
 {
 	s32 ret;
 	u16 val;
@@ -99,7 +99,7 @@ int __usb_checksend(s32 chn)
 	return ret;
 }
 
-int __usb_checkrecv(s32 chn)
+static int __usb_checkrecv(s32 chn)
 {
 	s32 ret;
 	u16 val;
@@ -150,6 +150,34 @@ int usb_isgeckoalive(s32 chn)
 	return ret;
 }
 
+int usb_checkrecv(s32 chn)
+{
+	s32 ret;
+
+	if (!EXI_LockEx(chn, EXI_DEVICE_0))
+		return 0;
+
+	ret = __usb_checkrecv(chn);
+
+	EXI_Unlock(chn);
+
+	return ret;
+}
+
+int usb_checksend(s32 chn)
+{
+	s32 ret;
+
+	if (!EXI_LockEx(chn, EXI_DEVICE_0))
+		return 0;
+
+	ret = __usb_checksend(chn);
+
+	EXI_Unlock(chn);
+
+	return ret;
+}
+
 int usb_recvbuffer_ex(s32 chn,void *buffer,int size, int retries)
 {
 	s32 ret;