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There are some information about missing/wrong documentation at cx231xx datasheet. Add it to the cx88 chapter. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
101 lines
2.5 KiB
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101 lines
2.5 KiB
ReStructuredText
The cx88 driver
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===============
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Author: Gerd Hoffmann
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This is a v4l2 device driver for the cx2388x chip.
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Current status
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--------------
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video
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- Works.
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- Overlay isn't supported.
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audio
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- Works. The TV standard detection is made by the driver, as the
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hardware has bugs to auto-detect.
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- audio data dma (i.e. recording without loopback cable to the
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sound card) is supported via cx88-alsa.
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vbi
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- Works.
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How to add support for new cards
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--------------------------------
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The driver needs some config info for the TV cards. This stuff is in
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cx88-cards.c. If the driver doesn't work well you likely need a new
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entry for your card in that file. Check the kernel log (using dmesg)
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to see whenever the driver knows your card or not. There is a line
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like this one:
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.. code-block:: none
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cx8800[0]: subsystem: 0070:3400, board: Hauppauge WinTV \
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34xxx models [card=1,autodetected]
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If your card is listed as "board: UNKNOWN/GENERIC" it is unknown to
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the driver. What to do then?
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1) Try upgrading to the latest snapshot, maybe it has been added
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meanwhile.
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2) You can try to create a new entry yourself, have a look at
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cx88-cards.c. If that worked, mail me your changes as unified
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diff ("diff -u").
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3) Or you can mail me the config information. We need at least the
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following information to add the card:
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- the PCI Subsystem ID ("0070:3400" from the line above,
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"lspci -v" output is fine too).
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- the tuner type used by the card. You can try to find one by
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trial-and-error using the tuner=<n> insmod option. If you
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know which one the card has you can also have a look at the
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list in CARDLIST.tuner
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Documentation missing at the cx88 datasheet
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-------------------------------------------
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MO_OUTPUT_FORMAT (0x310164)
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.. code-block:: none
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Previous default from DScaler: 0x1c1f0008
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Digit 8: 31-28
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28: PREVREMOD = 1
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Digit 7: 27-24 (0xc = 12 = b1100 )
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27: COMBALT = 1
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26: PAL_INV_PHASE
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(DScaler apparently set this to 1, resulted in sucky picture)
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Digits 6,5: 23-16
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25-16: COMB_RANGE = 0x1f [default] (9 bits -> max 512)
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Digit 4: 15-12
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15: DISIFX = 0
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14: INVCBF = 0
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13: DISADAPT = 0
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12: NARROWADAPT = 0
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Digit 3: 11-8
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11: FORCE2H
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10: FORCEREMD
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9: NCHROMAEN
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8: NREMODEN
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Digit 2: 7-4
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7-6: YCORE
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5-4: CCORE
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Digit 1: 3-0
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3: RANGE = 1
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2: HACTEXT
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1: HSFMT
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0x47 is the sync byte for MPEG-2 transport stream packets.
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Datasheet incorrectly states to use 47 decimal. 188 is the length.
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All DVB compliant frontends output packets with this start code.
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