V4L/DVB (9225): MFE: Add configurable gate control

This adds a configurable (one per card) gate control option
for multi-frontend. Prior to this point gate control was
assumed to be on the primary frontend, this is a fault
when the gate to the analogue section is on the secondary
which is the default for both the HVR-3000 and HVR-4000
in MFE.
Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx88/cx88-dvb.c

@@ -608,7 +608,10 @@ static int dvb_register(struct cx8802_dev *dev)
 	if (!fe0)
 		return -EINVAL;
 
-	/* init frontend */
+	/* multi-frontend gate control is undefined or defaults to fe0 */
+	dev->frontends.gate = 0;
+
+	/* init frontend(s) */
 	switch (core->boardnr) {
 	case CX88_BOARD_HAUPPAUGE_DVB_T1:
 		fe0->dvb.frontend = dvb_attach(cx22702_attach,
@@ -665,6 +668,7 @@ static int dvb_register(struct cx8802_dev *dev)
 		/* DVB-T init */
 		fe1 = videobuf_dvb_get_frontend(&dev->frontends, 2);
 		if (fe1) {
+			dev->frontends.gate = 2;
 			fe1->dvb.frontend = dvb_attach(cx22702_attach,
 				&hauppauge_hvr_config,
 				&dev->core->i2c_adap);
@@ -1008,6 +1012,7 @@ static int dvb_register(struct cx8802_dev *dev)
 		/* DVB-T Init */
 		fe1 = videobuf_dvb_get_frontend(&dev->frontends, 2);
 		if (fe1) {
+			dev->frontends.gate = 2;
 			fe1->dvb.frontend = dvb_attach(cx22702_attach,
 				&hauppauge_hvr_config,
 				&dev->core->i2c_adap);

drivers/media/video/cx88/cx88-i2c.c

@@ -116,23 +116,25 @@ static int detach_inform(struct i2c_client *client)
 
 void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
 {
-	struct videobuf_dvb_frontend *fe0 = NULL;
+	struct videobuf_dvb_frontends *f = &core->dvbdev->frontends;
+	struct videobuf_dvb_frontend *fe = NULL;
 	if (0 != core->i2c_rc)
 		return;
 
 #if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
-	if (core->dvbdev) {
-		/* Get the first frontend and assume that all I2C is routed through it */
-		/* TODO: Get _THIS_FE_ then find the right i2c_gate_ctrl for it */
-		fe0 = videobuf_dvb_get_frontend(&core->dvbdev->frontends, 1);
+	if (core->dvbdev && f) {
+		if(f->gate <= 1) /* undefined or fe0 */
+			fe = videobuf_dvb_get_frontend(f, 1);
+		else
+			fe = videobuf_dvb_get_frontend(f, f->gate);
 
-		if (fe0 && fe0->dvb.frontend && fe0->dvb.frontend->ops.i2c_gate_ctrl)
-			fe0->dvb.frontend->ops.i2c_gate_ctrl(fe0->dvb.frontend, 1);
+		if (fe && fe->dvb.frontend && fe->dvb.frontend->ops.i2c_gate_ctrl)
+			fe->dvb.frontend->ops.i2c_gate_ctrl(fe->dvb.frontend, 1);
 
 		i2c_clients_command(&core->i2c_adap, cmd, arg);
 
-		if (fe0 && fe0->dvb.frontend && fe0->dvb.frontend->ops.i2c_gate_ctrl)
-			fe0->dvb.frontend->ops.i2c_gate_ctrl(fe0->dvb.frontend, 0);
+		if (fe && fe->dvb.frontend && fe->dvb.frontend->ops.i2c_gate_ctrl)
+			fe->dvb.frontend->ops.i2c_gate_ctrl(fe->dvb.frontend, 0);
 	} else
 #endif
 		i2c_clients_command(&core->i2c_adap, cmd, arg);

include/media/videobuf-dvb.h

@@ -36,6 +36,7 @@ struct videobuf_dvb_frontends {
 	struct dvb_adapter adapter;
 	int active_fe_id; /* Indicates which frontend in the felist is in use */
 	struct videobuf_dvb_frontend frontend;
+	int gate; /* Frontend with gate control 0=!MFE,1=fe0,2=fe1 etc */
 };
 
 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,