[media] dvb_usb_v2: helper macros for device/adapter/frontend pointers

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dvb_usb.h

@@ -22,6 +22,14 @@
 #include "dmxdev.h"
 #include "dvb-usb-ids.h"
 
+/* helper macros for every DVB USB driver use */
+#define adap_to_d(adap) ((adap)->dev)
+#define adap_to_priv(adap) (adap_to_d(adap)->priv)
+#define fe_to_adap(fe) ((struct dvb_usb_adapter *) ((fe)->dvb->priv))
+#define fe_to_d(fe) (adap_to_d(fe_to_adap(fe)))
+#define fe_to_priv(fe) (fe_to_d(fe)->priv)
+#define d_to_priv(d) (d->priv)
+
 #define DVB_USB_STREAM_BULK(endpoint_, count_, size_) { \
 	.type = USB_BULK, \
 	.count = count_, \