+/* Call the specified callback for all subdevs matching hw (if 0, then
+ match them all). Ignore any errors. */
+#define ivtv_call_hw(itv, hw, o, f, args...) \
+ __v4l2_device_call_subdevs(&(itv)->v4l2_dev, !(hw) || (sd->grp_id & (hw)), o, f , ##args)
+
+#define ivtv_call_all(itv, o, f, args...) ivtv_call_hw(itv, 0, o, f , ##args)
+
+/* Call the specified callback for all subdevs matching hw (if 0, then
+ match them all). If the callback returns an error other than 0 or
+ -ENOIOCTLCMD, then return with that error code. */
+#define ivtv_call_hw_err(itv, hw, o, f, args...) \
+ __v4l2_device_call_subdevs_until_err(&(itv)->v4l2_dev, !(hw) || (sd->grp_id & (hw)), o, f , ##args)
+
+#define ivtv_call_all_err(itv, o, f, args...) ivtv_call_hw_err(itv, 0, o, f , ##args)
+