path: root/Documentation/video4linux/README.cx88
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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/video4linux/README.cx88
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+cx8800 release notes
+This is a v4l2 device driver for the cx2388x chip.
+current status
+ - Basically works.
+ - Some minor image quality glitches.
+ - For now only capture, overlay support isn't completed yet.
+ - The chip specs for the on-chip TV sound decoder are next
+ to useless :-/
+ - Neverless the builtin TV sound decoder starts working now,
+ at least for PAL-BG. Other TV norms need other code ...
+ - Most tuner chips do provide mono sound, which may or may not
+ be useable depending on the board design. With the Hauppauge
+ cards it works, so there is mono sound available as fallback.
+ - audio data dma (i.e. recording without loopback cable to the
+ sound card) should be possible, but there is no code yet ...
+ - some code present. Doesn't crash any more, but also doesn't
+ work yet ...
+how to add support for new cards
+The driver needs some config info for the TV cards. This stuff is in
+cx88-cards.c. If the driver doesn't work well you likely need a new
+entry for your card in that file. Check the kernel log (using dmesg)
+to see whenever the driver knows your card or not. There is a line
+like this one:
+ cx8800[0]: subsystem: 0070:3400, board: Hauppauge WinTV \
+ 34xxx models [card=1,autodetected]
+If your card is listed as "board: UNKNOWN/GENERIC" it is unknown to
+the driver. What to do then?
+ (1) Try upgrading to the latest snapshot, maybe it has been added
+ meanwhile.
+ (2) You can try to create a new entry yourself, have a look at
+ cx88-cards.c. If that worked, mail me your changes as unified
+ diff ("diff -u").
+ (3) Or you can mail me the config information. I need at least the
+ following informations to add the card:
+ * the PCI Subsystem ID ("0070:3400" from the line above,
+ "lspci -v" output is fine too).
+ * the tuner type used by the card. You can try to find one by
+ trial-and-error using the tuner=<n> insmod option. If you
+ know which one the card has you can also have a look at the
+ list in CARDLIST.tuner
+Have fun,
+ Gerd
+Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]