1 files changed, 58 insertions, 0 deletions
diff --git a/Documentation/admin-guide/media/cx88.rst b/Documentation/admin-guide/media/cx88.rst
new file mode 100644
index 000000000..e4badb181
--- /dev/null
+++ b/Documentation/admin-guide/media/cx88.rst
@@ -0,0 +1,58 @@
+.. 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