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+.. SPDX-License-Identifier: GPL-2.0
+
+The cx88 driver
+===============
+
+Author: Gerd Hoffmann
+
+This is a v4l2 device driver for the cx2388x chip.
+
+
+Current status
+--------------
+
+video
+ - Works.
+ - Overlay isn't supported.
+
+audio
+ - Works. The TV standard detection is made by the driver, as the
+ hardware has bugs to auto-detect.
+ - audio data dma (i.e. recording without loopback cable to the
+ sound card) is supported via cx88-alsa.
+
+vbi
+ - Works.
+
+
+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:
+
+.. code-block:: none
+
+ 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. We need at least the
+ following information 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