freebsd-dev/sys/pci/README.bt848

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This model now separates the "tuner control" items into a minor device:

Create a video device:
mknod bktr0 c 79 0

Create a tuner device:
mknod tuner0 c 79 16

minor device layout:  xxxxxxxx xxxT UUUU

 UUUU:   the card (ie UNIT) identifier, 0 thru 15
 T == 0: video device
 T == 1: tuner device

Access your tuner ioctl thru your tuner device handle and anything
which controls the video capture process thru the video device handle.

Certain ioctl()s such as video source are available thru both devices.

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There are 3 files necessary for the bt848 driver:

src/sys/i386/include/ioctl_bt848.h
src/sys/pci/brktree_reg.h
src/sys/pci/brooktree848.c

Note that src/sys/i386/include/ioctl_meteor.h is no longer modifed in any way
to support the bt848 boards (unless there were prio modifications that I am
unaware of).

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There are 2 settings that you might need to make based on the type of card
you have:

--
1:

The code now attempts to auto-probe code to detect card/tuner types.
The detected card is printed in the dmesg as the driver is loaded.  If
this fails to detect the proper card you can override it in brooktree848.c:

#define OVERRIDE_CARD	<card type>

where <card type> is one of:
	CARD_UNKNOWN
	CARD_MIRO
	CARD_HAUPPAUGE
	CARD_STB
	CARD_INTEL

--
2:

The following is for start-up convenience only, NOT mandatory:

These options select the set of frequencies used by the tuner.  In your
kernel config file set ONE of:

options	DEFAULT_CHNLSET=1	# CHNLSET_NABCST
options	DEFAULT_CHNLSET=2	# CHNLSET_CABLEIRC

Or, in pci/brooktree848.c, you can define ONE of:

#define DEFAULT_CHNLSET	CHNLSET_NABCST
#define DEFAULT_CHNLSET	CHNLSET_CABLEIRC

CHNLSET_NABCST (North American Broadcast frequencies) is the default.
CHNLSET_CABLEIRC selects the IRC cable frequencies.

Frequeny tables for other frequencies are yet to be written.