[media] dvb-usb: multi-frontend support (MFE)

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

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

@@ -162,8 +162,11 @@ static int dvb_usb_fe_wakeup(struct dvb_frontend *fe)
 
 	dvb_usb_device_power_ctrl(adap->dev, 1);
 
-	if (adap->fe_init)
-		adap->fe_init(fe);
+	if (adap->props.frontend_ctrl)
+		adap->props.frontend_ctrl(fe, 1);
+
+	if (adap->fe_init[fe->id])
+		adap->fe_init[fe->id](fe);
 
 	return 0;
 }
@@ -172,45 +175,89 @@ static int dvb_usb_fe_sleep(struct dvb_frontend *fe)
 {
 	struct dvb_usb_adapter *adap = fe->dvb->priv;
 
-	if (adap->fe_sleep)
-		adap->fe_sleep(fe);
+	if (adap->fe_sleep[fe->id])
+		adap->fe_sleep[fe->id](fe);
+
+	if (adap->props.frontend_ctrl)
+		adap->props.frontend_ctrl(fe, 0);
 
 	return dvb_usb_device_power_ctrl(adap->dev, 0);
 }
 
 int dvb_usb_adapter_frontend_init(struct dvb_usb_adapter *adap)
 {
+	int ret, i, x;
+
+	memset(adap->fe, 0, sizeof(adap->fe));
+
 	if (adap->props.frontend_attach == NULL) {
-		err("strange: '%s' #%d doesn't want to attach a frontend.",adap->dev->desc->name, adap->id);
+		err("strange: '%s' #%d doesn't want to attach a frontend.",
+			adap->dev->desc->name, adap->id);
+
+		return 0;
+	}
+
+	/* register all given adapter frontends */
+	if (adap->props.num_frontends)
+		x = adap->props.num_frontends - 1;
+	else
+		x = 0;
+
+	for (i = 0; i <= x; i++) {
+		ret = adap->props.frontend_attach(adap);
+		if (ret || adap->fe[i] == NULL) {
+			/* only print error when there is no FE at all */
+			if (i == 0)
+				err("no frontend was attached by '%s'",
+					adap->dev->desc->name);
+
 			return 0;
 		}
 
+		adap->fe[i]->id = i;
+
 		/* re-assign sleep and wakeup functions */
-	if (adap->props.frontend_attach(adap) == 0 && adap->fe[0] != NULL) {
-		adap->fe_init  = adap->fe[0]->ops.init;  adap->fe[0]->ops.init  = dvb_usb_fe_wakeup;
-		adap->fe_sleep = adap->fe[0]->ops.sleep; adap->fe[0]->ops.sleep = dvb_usb_fe_sleep;
-
-		if (dvb_register_frontend(&adap->dvb_adap, adap->fe[0])) {
-			err("Frontend registration failed.");
-			dvb_frontend_detach(adap->fe[0]);
-			adap->fe[0] = NULL;
+		adap->fe_init[i] = adap->fe[i]->ops.init;
+		adap->fe[i]->ops.init  = dvb_usb_fe_wakeup;
+		adap->fe_sleep[i] = adap->fe[i]->ops.sleep;
+		adap->fe[i]->ops.sleep = dvb_usb_fe_sleep;
+
+		if (dvb_register_frontend(&adap->dvb_adap, adap->fe[i])) {
+			err("Frontend %d registration failed.", i);
+			dvb_frontend_detach(adap->fe[i]);
+			adap->fe[i] = NULL;
+			/* In error case, do not try register more FEs,
+			 * still leaving already registered FEs alive. */
+			if (i == 0)
 				return -ENODEV;
+			else
+				return 0;
 		}
 
 		/* only attach the tuner if the demod is there */
 		if (adap->props.tuner_attach != NULL)
 			adap->props.tuner_attach(adap);
-	} else
-		err("no frontend was attached by '%s'",adap->dev->desc->name);
+	}
 
 	return 0;
 }
 
 int dvb_usb_adapter_frontend_exit(struct dvb_usb_adapter *adap)
 {
-	if (adap->fe[0] != NULL) {
-		dvb_unregister_frontend(adap->fe[0]);
-		dvb_frontend_detach(adap->fe[0]);
+	int i;
+
+	/* unregister all given adapter frontends */
+	if (adap->props.num_frontends)
+		i = adap->props.num_frontends - 1;
+	else
+		i = 0;
+
+	for (; i >= 0; i--) {
+		if (adap->fe[i] != NULL) {
+			dvb_unregister_frontend(adap->fe[i]);
+			dvb_frontend_detach(adap->fe[i]);
 		}
+	}
+
 	return 0;
 }

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

@@ -77,6 +77,10 @@ static int dvb_usb_adapter_init(struct dvb_usb_device *d, short *adapter_nrs)
 			return ret;
 		}
 
+		/* use exclusive FE lock if there is multiple shared FEs */
+		if (adap->fe[1])
+			adap->dvb_adap.mfe_shared = 1;
+
 		d->num_adapters_initialized++;
 		d->state |= DVB_USB_STATE_DVB;
 	}

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

@@ -124,6 +124,8 @@ struct usb_data_stream_properties {
  * @caps: capabilities of the DVB USB device.
  * @pid_filter_count: number of PID filter position in the optional hardware
  *  PID-filter.
+ * @num_frontends: number of frontends of the DVB USB adapter.
+ * @frontend_ctrl: called to power on/off active frontend.
  * @streaming_ctrl: called to start and stop the MPEG2-TS streaming of the
  *  device (not URB submitting/killing).
  * @pid_filter_ctrl: called to en/disable the PID filter, if any.
@@ -141,7 +143,9 @@ struct dvb_usb_adapter_properties {
 #define DVB_USB_ADAP_RECEIVES_204_BYTE_TS         0x08
 	int caps;
 	int pid_filter_count;
+	int num_frontends;
 
+	int (*frontend_ctrl)   (struct dvb_frontend *, int);
 	int (*streaming_ctrl)  (struct dvb_usb_adapter *, int);
 	int (*pid_filter_ctrl) (struct dvb_usb_adapter *, int);
 	int (*pid_filter)      (struct dvb_usb_adapter *, int, u16, int);
@@ -345,6 +349,7 @@ struct usb_data_stream {
  *
  * @stream: the usb data stream.
  */
+#define MAX_NO_OF_FE_PER_ADAP 2
 struct dvb_usb_adapter {
 	struct dvb_usb_device *dev;
 	struct dvb_usb_adapter_properties props;
@@ -363,11 +368,11 @@ struct dvb_usb_adapter {
 	struct dmxdev        dmxdev;
 	struct dvb_demux     demux;
 	struct dvb_net       dvb_net;
-	struct dvb_frontend *fe[1];
+	struct dvb_frontend *fe[MAX_NO_OF_FE_PER_ADAP];
 	int                  max_feed_count;
 
-	int (*fe_init)  (struct dvb_frontend *);
-	int (*fe_sleep) (struct dvb_frontend *);
+	int (*fe_init[MAX_NO_OF_FE_PER_ADAP])  (struct dvb_frontend *);
+	int (*fe_sleep[MAX_NO_OF_FE_PER_ADAP]) (struct dvb_frontend *);
 
 	struct usb_data_stream stream;