media: pvrusb2: Add i2c client demod/tuner support

i2c client device is the "new" method to attach to dvb modules, include
support for this functionality. Cleanup code has been added to init in
case of failure, as well as to frontend exit.

Required by Hauppauge HVR-1975

Signed-off-by: Brad Love <brad@nextdimension.cc>
Reviewed-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/pvrusb2/pvrusb2-dvb.c

@@ -404,6 +404,9 @@ fail_tuner:
 fail_frontend0:
 	dvb_frontend_detach(adap->fe[0]);
 	adap->fe[0] = NULL;
+	dvb_module_release(adap->i2c_client_tuner);
+	dvb_module_release(adap->i2c_client_demod[1]);
+	dvb_module_release(adap->i2c_client_demod[0]);
 
 	return ret;
 }
@@ -420,6 +423,14 @@ static int pvr2_dvb_frontend_exit(struct pvr2_dvb_adapter *adap)
 		dvb_frontend_detach(adap->fe[0]);
 		adap->fe[0] = NULL;
 	}
+
+	dvb_module_release(adap->i2c_client_tuner);
+	adap->i2c_client_tuner = NULL;
+	dvb_module_release(adap->i2c_client_demod[1]);
+	adap->i2c_client_demod[1] = NULL;
+	dvb_module_release(adap->i2c_client_demod[0]);
+	adap->i2c_client_demod[0] = NULL;
+
 	return 0;
 }
 

drivers/media/usb/pvrusb2/pvrusb2-dvb.h

@@ -20,6 +20,9 @@ struct pvr2_dvb_adapter {
 	struct dvb_net		dvb_net;
 	struct dvb_frontend	*fe[2];
 
+	struct i2c_client	*i2c_client_demod[2];
+	struct i2c_client	*i2c_client_tuner;
+
 	int			feedcount;
 	int			max_feed_count;