V4L/DVB (11078): au0828: properly handle non-existent analog inputs

It is not valid to look for dev->board.input == NULL to detect an undefined
analog configuration section, since it is a member of the struct and not a
pointer (hence it will *always* be non-NULL).  Do the check based on whether
the first input is actually a valid input type instead.

Thanks to Michael Krufky <mkrufky@linuxtv.org> for providing sample hardware
of various configurations to test with.

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 5 insertions, 4 deletions

diff --git a/drivers/media/video/au0828/au0828-cards.c b/drivers/media/video/au0828/au0828-cards.c
index e10b1b9221e0..0516c060810e 100644
--- a/drivers/media/video/au0828/au0828-cards.c
+++ b/drivers/media/video/au0828/au0828-cards.c
@@ -195,7 +195,7 @@ void au0828_card_setup(struct au0828_dev *dev)
                 break;
         }
 
-        if (dev->board.input != NULL) {
+        if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) {
                 /* Load the analog demodulator driver (note this would need to
                    be abstracted out if we ever need to support a different
                    demod) */
diff --git a/drivers/media/video/au0828/au0828-core.c b/drivers/media/video/au0828/au0828-core.c
index 2b5ade626e57..5199c8aa5888 100644
--- a/drivers/media/video/au0828/au0828-core.c
+++ b/drivers/media/video/au0828/au0828-core.c
@@ -146,7 +146,7 @@ static void au0828_usb_disconnect(struct usb_interface *interface)
         /* Digital TV */
         au0828_dvb_unregister(dev);
 
-        if (dev->board.input != NULL)
+        if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
                 au0828_analog_unregister(dev);
 
         /* I2C */
@@ -205,7 +205,7 @@ static int au0828_usb_probe(struct usb_interface *interface,
         au0828_card_setup(dev);
 
         /* Analog TV */
-        if (dev->board.input != NULL)
+        if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
                 au0828_analog_register(dev, interface);
 
         /* Digital TV */
diff --git a/drivers/media/video/au0828/au0828.h b/drivers/media/video/au0828/au0828.h
index d2e54c8e18c4..590d15e461dc 100644
--- a/drivers/media/video/au0828/au0828.h
+++ b/drivers/media/video/au0828/au0828.h
@@ -66,7 +66,8 @@
 #define AU0828_MAX_INPUT        4
 
 enum au0828_itype {
-        AU0828_VMUX_COMPOSITE = 1,
+        AU0828_VMUX_UNDEFINED = 0,
+        AU0828_VMUX_COMPOSITE,
         AU0828_VMUX_SVIDEO,
         AU0828_VMUX_CABLE,
         AU0828_VMUX_TELEVISION,