media: em28xx-cards: disable V4L2 mode for dual tuners

Right now, the code that calculates alternate modes is not ready
for devices with dual tuners. That's ok, as we currently don't
have any such devices, but better to add a warning for such
case, as, if anyone adds such device, the logic will need to
be reviewed.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Brad Love <brad@nextdimension.cc>
Reviewed-by: Michael Ira Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c
index 48bc505a872abb818a4adfc03370eb060cbdd8f1..afdc92998fff92160e8652be0c86ac34d9df72a2 100644 (file)
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -3861,6 +3861,17 @@ static int em28xx_usb_probe(struct usb_interface *intf,
                dev->has_video = false;
        }
 
+       if (dev->board.has_dual_ts &&
+           (dev->tuner_type != TUNER_ABSENT || INPUT(0)->type)) {
+               /*
+                * The logic with sets alternate is not ready for dual-tuners
+                * which analog modes.
+                */
+               dev_err(&intf->dev,
+                       "We currently don't support analog TV or stream capture on dual tuners.\n");
+               has_video = false;
+       }
+
        /* Select USB transfer types to use */
        if (has_video) {
                if (!dev->analog_ep_isoc || (try_bulk && dev->analog_ep_bulk))