520 lines
27 KiB
Plaintext
520 lines
27 KiB
Plaintext
/* $FreeBSD$ */
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/*
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* This is part of the Driver for Video Capture Cards (Frame grabbers)
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* and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
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* chipset.
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* Copyright Roger Hardiman and Amancio Hasty.
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*
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* CHANGELOG : The Change History:
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* These version numbers represent the authors own numbering.
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* They are unrelated to Revision Control numbering of FreeBSD or
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* any other system.
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1.0 1/24/97 First Alpha release
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1.1 2/20/97 Added video ioctl so we can do PCI To PCI
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data transfers. This is for capturing data
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directly to a vga frame buffer which has
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a linear frame buffer. Minor code clean-up.
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1.3 2/23/97 Fixed system lock-up reported by
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Randall Hopper <rhh@ct.picker.com>. This
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problem seems somehow to be exhibited only
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in his system. I changed the setting of
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INT_MASK for CAP_CONTINUOUS to be exactly
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the same as CAP_SINGLE apparently setting
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bit 23 cleared the system lock up.
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version 1.1 of the driver has been reported
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to work with STB's WinTv, Hauppage's Wincast/Tv
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and last but not least with the Intel Smart
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Video Recorder.
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1.4 3/9/97 fsmp@freefall.org
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Merged code to support tuners on STB and WinCast
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cards.
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Modifications to the contrast and chroma ioctls.
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Textual cleanup.
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1.5 3/15/97 fsmp@freefall.org
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new bt848 specific versions of hue/bright/
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contrast/satu/satv.
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Amancio's patch to fix "screen freeze" problem.
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1.6 3/19/97 fsmp@freefall.org
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new table-driven frequency lookup.
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removed disable_intr()/enable_intr() calls from i2c.
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misc. cleanup.
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1.7 3/19/97 fsmp@freefall.org
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added audio support submitted by:
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Michael Petry <petry@netwolf.NetMasters.com>
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1.8 3/20/97 fsmp@freefall.org
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extended audio support.
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card auto-detection.
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major cleanup, order of routines, declarations, etc.
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1.9 3/22/97 fsmp@freefall.org
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merged in Amancio's minor unit for tuner control
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mods.
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misc. cleanup, especially in the _intr routine.
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made AUDIO_SUPPORT mainline code.
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1.10 3/23/97 fsmp@freefall.org
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added polled hardware i2c routines,
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removed all existing software i2c routines.
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created software i2cProbe() routine.
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Randall Hopper's fixes of BT848_GHUE & BT848_GBRIG.
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eeprom support.
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1.11 3/24/97 fsmp@freefall.org
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Louis Mamakos's new bt848 struct.
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1.12 3/25/97 fsmp@freefall.org
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japanese freq table from Naohiro Shichijo.
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new table structs for tuner lookups.
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major scrub for "magic numbers".
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1.13 3/28/97 fsmp@freefall.org
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1st PAL support.
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MAGIC_[1-4] demarcates magic #s needing PAL work.
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AFC code submitted by Richard Tobin
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<richard@cogsci.ed.ac.uk>.
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1.14 3/29/97 richard@cogsci.ed.ac.uk
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PAL support: magic numbers moved into
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format_params structure.
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Revised AFC interface.
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fixed DMA_PROG_ALLOC size misdefinition.
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1.15 4/18/97 John-Mark Gurney <gurney_j@resnet.uoregon.edu>
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Added [SR]RGBMASKs ioctl for byte swapping.
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1.16 4/20/97 Randall Hopper <rhh@ct.picker.com>
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Generalized RGBMASK ioctls for general pixel
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format setting [SG]ACTPIXFMT, and added query API
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to return driver-supported pix fmts GSUPPIXFMT.
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1.17 4/21/97 hasty@rah.star-gate.com
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Clipping support added.
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1.18 4/23/97 Clean up after failed CAP_SINGLEs where bt
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interrupt isn't delivered, and fixed fixing
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CAP_SINGLEs that for ODD_ONLY fields.
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1.19 9/8/97 improved yuv support , cleaned up weurope
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channel table, incorporated cleanup work from
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Luigi, fixed pci interface bug due to a
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change in the pci interface which disables
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interrupts from a PCI device by default,
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Added Luigi's, ioctl's BT848_SLNOTCH,
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BT848_GLNOTCH (set luma notch and get luma not)
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1.20 10/5/97 Keith Sklower <sklower@CS.Berkeley.EDU> submitted
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a patch to fix compilation of the BSDI's PCI
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interface.
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Hideyuki Suzuki <hideyuki@sat.t.u-tokyo.ac.jp>
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Submitted a patch for Japanese cable channels
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Joao Carlos Mendes Luis jonny@gta.ufrj.br
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Submitted general ioctl to set video broadcast
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formats (PAL, NTSC, etc..) previously we depended
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on the Bt848 auto video detect feature.
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1.21 10/24/97 Randall Hopper <rhh@ct.picker.com>
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Fix temporal decimation, disable it when
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doing CAP_SINGLEs, and in dual-field capture, don't
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capture fields for different frames
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1.22 11/08/97 Randall Hopper <rhh@ct.picker.com>
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Fixes for packed 24bpp - FIFO alignment
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1.23 11/17/97 Amancio <hasty@star-gate.com>
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Added yuv support mpeg encoding
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1.24 12/27/97 Jonathan Hanna <pangolin@rogers.wave.ca>
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Patch to support Philips FR1236MK2 tuner
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1.25 02/02/98 Takeshi Ohashi
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<ohashi@atohasi.mickey.ai.kyutech.ac.jp> submitted
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code to support bktr_read .
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Flemming Jacobsen <fj@schizo.dk.tfs.com>
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submitted code to support radio available with in
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some bt848 based cards;additionally, wrote code to
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correctly recognized his bt848 card.
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Roger Hardiman <roger@cs.strath.ac.uk> submitted
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various fixes to smooth out the microcode and made
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all modes consistent.
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1.26 Moved Luigi's I2CWR ioctl from the video_ioctl
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section to the tuner_ioctl section
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Changed Major device from 79 to 92 and reserved
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our Major device number -- hasty@star-gate.com
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1.27 Last batch of patches for radio support from
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Flemming Jacobsen <fj@trw.nl>.
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Added B849 PCI ID submitted by:
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Tomi Vainio <tomppa@fidata.fi>
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1.28 Frank Nobis <fn@Radio-do.de> added tuner support
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for the German Phillips PAL tuner and
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additional channels for german cable tv.
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1.29 Roger Hardiman <roger@cs.strath.ac.uk>
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Revised autodetection code to correctly handle both
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old and new VideoLogic Captivator PCI cards.
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Added tsleep of 2 seconds to initialistion code
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for PAL users.Corrected clock selection code on
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format change.
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1.30 Bring back Frank Nobis <fn@Radio-do.de>'s opt_bktr.h
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1.31 Randall Hopper <rhh@ct.picker.com>
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submitted ioctl to clear the video buffer
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prior to starting video capture
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Amancio : clean up yuv12 so that it does not
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affect rgb capture. Basically, fxtv after
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capturing in yuv12 mode , switching to rgb
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would cause the video capture to be too bright.
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1.32 disable inverse gamma function for rgb and yuv
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capture. fixed meteor brightness ioctl it now
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converts the brightness value from unsigned to
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signed.
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1.33 added sysctl: hw.bt848.tuner, hw.bt848.reverse_mute,
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hw.bt848.card
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card takes a value from 0 to bt848_max_card
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tuner takes a value from 0 to bt848_max_tuner
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reverse_mute : 0 no effect, 1 reverse tuner
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mute function some tuners are wired reversed :(
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1.34 reverse mute function for ims turbo card
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1.35 Roger Hardiman <roger@cs.strath.ac.uk>
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options BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_PAL
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in the kernel config file makes the driver's
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video_open() function select PAL rather than NTSC.
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This fixed all the hangs on my Dual Crystal card
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when using a PAL video signal. As a result, you
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can lose the tsleep (of 2 seconds - now 0.25!!)
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which I previously added. (Unless someone else
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wanted the 0.25 second tsleep).
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1.36 added bt848.format sysctl variable.
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1 denotes NTSC , 0 denotes PAL
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1.37 added support for Bt878 and improved Hauppauge's
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bt848 tuner recognition
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1.38 Further improvements on Hauppauge's rely on
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eeprom[9] to determine the tuner type 8)
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AVerMedia card type added <sos@freebsd.org>
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1.39 08/05/98 Roger Hardiman <roger@cs.strath.ac.uk>
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Updated Hauppauge detection code for Tuner ID 0x0a
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for newer NTSC WinCastTV 404 with Bt878 chipset.
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Tidied up PAL default in video_open()
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Soren bumped version from 1.39 to 1.49 to sync
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with FreeBSD CVS numbers.
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1.49 10 August 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Added Capture Area ioctl - BT848[SG]CAPAREA.
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Normally the full 640x480 (768x576 PAL) image
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is grabbed. This ioctl allows a smaller area
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from anywhere within the video image to be
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grabbed, eg a 400x300 image from (50,10).
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See restrictions in BT848SCAPAREA.
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1.50 31 August 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Renamed BT848[SG]CAPAREA to BT848_[SG]CAPAREA.
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Added PR kern/7177 for SECAM Video Highway Xtreme
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with single crystal PLL configuration
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submitted by Vsevolod Lobko <seva@alex-ua.com>.
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In kernel configuration file add
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options OVERRIDE_CARD=2
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options OVERRIDE_TUNER=11
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options BKTR_USE_PLL
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1.51 31 August 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Fixed bug in Miro Tuner detection. Missing Goto.
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Removed Hauppauge EEPROM 0x10 detection as I think
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0x10 should be a PAL tuner, not NTSC.
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Reinstated some Tuner Guesswork code from 1.27
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1.52 3 Sep 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Submitted patch by Vsevolod Lobko <seva@alex-ua.com>
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to correct SECAM B-Delay and add XUSSR channel set.
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1.53 9 Sep 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Changed METEORSINPUT for Hauppauge cards with bt878.
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Submitted by Fred Templin <templin@erg.sri.com>
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Also fixed video_open defines and 878 support.
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1.54 18 Sep 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Changed tuner code to autodetect tuner i2c address.
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Addresses were incorrectly hardcoded.
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1.55 21 Sep 1998 Roger Hardiman <roger@cs.strath.ac.uk>
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Hauppauge Tech Support confirmed all Hauppauge 878
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PAL/SECAM boards will use PLL mode.
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Added to card probe. Thanks to Ken and Fred.
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1.56 21 Jan 1999 Roger Hardiman <roger@cs.strath.ac.uk>
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Added detection of Hauppauge IR remote control.
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and MSP34xx Audio chip. Fixed i2c read error.
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Hauppauge supplied details of new Tuner Types.
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Danny Braniss <danny@cs.huji.ac.il> submitted Bt878
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AVerMedia detection with PCI subsystem vendor id.
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1.57 26 Jan 1999 Roger Hardiman <roger@cs.strath.ac.uk>
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Support for MSP3410D / MSP3415D Stereo/Mono audio
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using the audio format Auto Detection Mode.
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Nicolas Souchu <nsouch@freebsd.org> ported the
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msp_read/write/reset functions to smbus/iicbus.
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METEOR_INPUT_DEV2 now selects a composite camera on
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the SVIDEO port for Johan Larsson<gozer@ludd.luth.se>
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For true SVIDEO, use METEOR_INPUT_DEV_SVIDEO
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1.58 8 Feb 1999 Roger Hardiman <roger@cs.strath.ac.uk>
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Added check to bktr_mmap from OpenBSD driver.
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Improved MSP34xx reset for bt848 Hauppauge boards.
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Added detection for Bt848a.
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Vsevolod Lobko<seva@sevasoft.alex-ua.com> added
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more XUSSR channels.
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1.59 9 Feb 1999 Added ioctl REMOTE_GETKEY for Hauppauge Infra-Red
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Remote Control. Submitted by Roger Hardiman.
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Added ioctl TVTUNER_GETCHANSET and
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BT848_GPIO_SET_EN,BT848_GPIO_SET_DATA (and GETs)
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Submitted by Vsevolod Lobko <seva@alex-ua.com>
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1.60 23 Feb 1999 Roger Hardiman <roger@freebsd.org>
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Corrected Mute on Hauppauge Radio cards.
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Autodetect MMAC Osprey by looking for "MMAC" in the EEPROM.
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Added for Jan Schmidt <mmedia@rz.uni-greifswald.de>
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Added ALPS Tuner Type from Hiroki Mori <mori@infocity.co.jp>
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1.61 29 Apr 1999 Roger Hardiman <roger@freebsd.org>
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Fix row=0/columns=0 bug. From Randal Hopper<aa8vb@ipass.net>
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Add option to block the reset of the MSP34xx audio chip by
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adding options BKTR_NO_MSP_RESET to the kernel config file.
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This is useful if you run another operating system
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first to initialise the audio chip, then do a soft reboot.
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Added for Yuri Gindin <yuri@xpert.com>
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1.62 29 Apr 1999 Added new cards: NEC PK-UG-X017 and I/O DATA GV-BCTV2/PCI
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Added new tuner: ALPS_TSBH1 (plus FM Radio for ALPS_TSCH5)
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Added support for BCTV audio mux.
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All submitted by Hiroki Mori <mori@infocity.co.jp>
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1.63 29 Apr 1999 Roger Hardiman <roger@freebsd.org>
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Added initial code for VBI capture based on work by
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Hiroki Mori <mori@infocity.co.jp> and reworked by myself.
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This allows software decoding of teletext, intercast and
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subtitles via /dev/vbi.
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1.64 7 May 1999 Roger Hardiman <roger@freebsd.org>
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Support LifeView FlyVideo 98 cards. Use EEPROM for card
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autodetection. Use bttv's audio mux values.
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Thanks to Paul Reece <paul@fastlane.net.au>,
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Ivan Brawley <brawley@internode.com.au> and
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Gilad Rom <rom_glsa@ein-hashofet.co.il>
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Automatically locate the EEPROM i2c address and read the
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subsystem_vendor_id from EEPROM and not the PCI registers.
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Add NSMBUS checks around smbus/iicbus i2c bus code
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making it easier to compile the driver under 2.2.x.
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Add GPIO mask for the audio mux to each card type.
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Add CARD_ZOLTRIX and CARD_KISS from mailing list searches.
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1.65 18 May 1999 Roger Hardiman <roger@freebsd.org>
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Change Intel GPIO mask to stop turning the Intel Camera off
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Fixed tuner selection on Hauppauge card with tuner 0x0a
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Replaced none tuner with no tuner for Theo de Raadt.
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Ivan Brawley <brawley@internode.com.au> added
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the Australian channel frequencies.
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1.66 19 May 1999 Ivan Brawley <brawley@internode.com.au> added better
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Australian channel frequencies.
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1.67 23 May 1999 Roger Hardiman <roger@freebsd.org>
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Added rgb_vbi_prog() to capture VBI data and video at the
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same time. To capture VBI data, /dev/vbi must be opened
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before starting video capture.
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1.68 25 May 1999 Roger Hardiman <roger@freebsd.org>
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Due to differences in PCI bus implementations from various
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motherboard chipset manufactuers, the Bt878/Bt879 has 3
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PCI bus compatibility modes. These are
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NORMAL PCI 2.1 for proper PCI 2.1 compatible chipsets.
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INTEL 430 FX for the Intel 430 FX chipset.
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SIS VIA CHIPSET for certain SiS and VIA chipsets.
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Older Intel and non-Intel chipsets may also benefit from
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either 430_FX or SIS/VIA mode.
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NORMAL PCI mode is enabled by default.
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For INTEL 430 FX mode, add this to your kenel config:
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options "BKTR_430_FX_MODE"
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For SiS / VIA mode, add this to your kernel config:
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options "BKTR_SIS_VIA_MODE"
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Using quotes in these options is not needed in FreeBSD 4.x.
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Note. Newer VIA chipsets should be fully PCI 2.1 compatible
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and should work fine in the Default mode.
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Also rename 849 to 849A, the correct name for the chip.
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1.69 12 June 1999 Roger Hardiman <roger@freebsd.org>
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Updates for FreeBSD 4.x device driver interface.
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BSDI code removed. Will be restored later.
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1.70 12 July 1999 Roger Hardiman <roger@freebsd.org>
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Reorganise OS device dependant parts (based on a port to
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linux by Brad Parker).
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Make the driver compile on FreeBSD 2.2.x systems again.
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Change number of VBI lines from 16 to 12 for NTSC formats.
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Changes to probeCard() for better eeprom identification.
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Added STB Bt878 card identification.
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Add Hauppauge model identification to probeCard().
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Added TDA9850 initialisation code taken from Linux bttv.
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Juha.Nurmela@quicknet.inet.fi found/fixed bug in VBI_SLEEP.
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Matt Brown <matt@dqc.org> added MSP3430G DBX initialisation.
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1.71 30 Aug 1999 Roger Hardiman <roger@freebsd.org>
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Small cleanup of OS dependant code. Remove NPCI usage.
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Fix bug in AVerMedia detection.
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Update VBI support for the AleVT Teletext package. Parts
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from Juha Nurmela's driver <Juha.Nurmela@quicknet.inet.fi>
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Add support for Hauppauge 627 and Temic 4006 submitted
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by Maurice Castro <maurice@atum.castro.aus.net>
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Tom Jansen <tom@unhooked.net> added BSDi support again.
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1.72 31 Aug 1999 Juha Nurmela <Juha.Nurmela@quicknet.inet.fi>
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Clear cap_ctl register when restarting the RISC program.
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This fixes the freezes experienced when changing changes.
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1.73 10 Sep 1999 Roger Hardiman <roger@freebsd.org>
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Add Hauppauge tuner #6 for Brian Somers <brian@freebsd.org>
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Add card type for Aimslabs Video Highway Xtreme for
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Ladislav Kostal <kostal@pefstud.uniag.sk>
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Added select() code (for VBI) for the 2.2.x driver
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tested by Steve Richards <steve@richsoft.demon.co.uk>
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1.74 17 Sep 1999 Roger Hardiman <roger@freebsd.org>
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Fix bug where FM radio stations were offset after using FXTV
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AVerMedia tuner type autodetection added for cards with
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a configuration EEPROM (currently their Bt878 range)
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Thanks to Frank at AVerMedia for providing the information.
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Tested by David La Croix <dlacroix@cowpie.acm.vt.edu>
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Tidy up some tuner code and Hauppauge detection code.
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New NetBSD code from Bernd Ernesti<bernd@arresum.inka.de>
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2.00 25 Sep 1999 Roger Hardiman <roger@freebsd.org>
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Split the driver into separate tuner, card and audio sections.
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Update tuner code for FM radio to use datasheet equations.
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2.01 27 Sep 1999 Roger Hardiman <roger@freebsd.org>
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Add Dynalink Magic TView for Craig <crh@outpost.co.nz>
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Add Leadtek Winfast 2000 for Peter Wemm <peter@netplex.com.au>
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There is no audio support on these 2 cards yet.
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Tidy up a few tables with tabs and PLL selection code.
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Restore Video Highway Xtreme PLL code.
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2.02 4 Oct 1999 Peter Wemm <peter@netplex.com.au>
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Updated Australian Channel Set.
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Added Tuner and Mute values for LeadTek Winfast 2000 card
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2.03 5 Oct 1999 Thomas Runge <runge@rostock.zgdv.de>
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Found FM radio bug mute introduced in release 2.00
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2.04 20 Oct 1999 Roger Hardiman <roger@freebsd.org>
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Updated AVerMedia audio sources to support FM and Line In
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sources properly. (Based on info supplied by AVerMedia)
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Make PLL mode the default for Bt878 chips. This means PAL
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Bt878 users no longer need the BKTR_USE_PLL kernel option.
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Detect and auto-configure Dolby Surround Sound DPL3518A chip
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on Hauppauge WinTV Theater. From Frank Nobis <fn@radio-do.de>
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2.05 8 Nov 1999 Update tuner control codes for Philips SECAM. Submitted by
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Cyrille Lefevre <clefevre@citeweb.net>
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Updated clipping code, ready for Xv support in XFree86 4.0,
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submitted by Thomas Mueller <tmueller@thmu.de>
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Thomas also has information on a LynxOS port of this driver.
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Phase out the rgb_prog RISC program and use rgb_vbi_prog as
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the default. Now you no longer have to open /dev/vbi
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before /dev/bktr. - Roger Hardiman <roger@freebsd.org>
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2.06 7 Dec 1999 Fix bug which made the tuner fail on cards detected as
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IMS Turbo. Found by Patrick Mackeown<pgm@NS4.HELP-DESK.CO.UK>
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Put back some Hauppauge Tuner Types I deleted my mistake.
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|
Backout the switch from rgb_prob to rgb_vbi_prog due to
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problems with NTSC users.
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2.07 24 Jan 2000 Update i2c code to build on FreeBSD 3.x and 4.x machines.
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Added GPIO audio values for the Askey/Dynalink TV card
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|
taken from postings on the V4L mailing list.
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|
Update Australian Channel Set. Submitted by
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|
John Birrell <jb@cimlogic.com.au>
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|
Add new Channel Set for France. Submitted by
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|
Daniel Dagneaux <dagneaux@lure.u-psud.fr>
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2.08 6 Mar 2000 Reinstate rgb_vbi_prog as the default RISC program for
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|
PAL video. This does not want to work for NTSC, which will
|
|
continue to use the rgb_prog RISC program.
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|
Add support for cable channels above channel 100.
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|
Submitted by Scott Presnell <srp@zgi.com>
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|
New MSP3410/3415 setup code submitted by
|
|
Frank Nobis<fn@radio-do.de>. This is experimental and is
|
|
enabled by setting the sysctl, hw.bt848.slow_msp_audio to 1
|
|
before starting FXTV (or before opening /dev/bktrN)
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2.09 20 Mar 2000 Thomas Klausner <wiz@danbala.ifoer.tuwien.ac.at> submitted
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|
patches to include the NetBSD and OpenBSD support from driver
|
|
1.74 into the new 2.xx driver. NetBSD is tested. OpenBSD is
|
|
untested.
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|
Also fixed coding error in bktr_audio.c spotted by Thomas.
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|
Change xxx_ioctl functions to use ioctl_cmd_t for the cmd
|
|
parameter. Found by looking at OpenBSDs change logs.
|
|
Delete PROT_EXEC from OpenBSD (as per OpenBSD cvs logs).
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|
2.10 4 Apr 2000 Convert to using bus_space() to access the Bt848/878 registers
|
|
rather than using a memory mapped structure. This makes the
|
|
driver portable to other architectures, like Alpha and PPC.
|
|
This was done by Thomas Klausner <wiz@netbsd.org> and
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|
myself Roger Hardiman <roger@freebsd.org>
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2.11 15 Apr 2000 Made changes so the driver compiles on FreeBSD/Alpha.
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|
Stop printing MSP autodetect. Requested by
|
|
Chris D. Faulhaber <jedgar@fxp.org>
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|
2.12 16 Apr 2000 Set adelay as an 8 bit value, noticed by
|
|
Thomas Klausner <wiz@netbsd.org>
|
|
Fix typo in the new interrupt code.
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|
|
|
2.12 20 May 2000 Merge in NetBSD changes from Thomas Klausner <wiz@netbsd.org>
|
|
following the import of driver 2.12 into NetBSD
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|
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|
2.13 26 Jun 2000 Merge in more changes from Thomas Klausner <wiz@netbsd.org>
|
|
syncing this driver with the NetBSD source at 25th June.
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|
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|
2.14 28 Jun 2000 Add new Hauppauge Tuner Types, supplied by Hauppauge and
|
|
required for Josef Karthauser <joe@pavilion.net>
|
|
Change the structure of some of the #include files and
|
|
merge in more NetBSD changes.
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|
|
|
2.15 10 Sep 2000 Add support for bktr_mem, a module to hold onto the bktr
|
|
drives's contiguous memory buffers even when it is unloaded
|
|
and reloaded.
|
|
Simplify the use of the optional SMBUS i2c code by using a new
|
|
#define called BKTR_USE_FREEBSD_SMBUS.
|
|
Poul-Henning Kamp <phk@freebsd.org> changed the DEVFS code.
|
|
Peter Wemm <peter@freebsd.org> fixed an SMBUS warning.
|
|
Alexander Langer <alex@cichlids.com> fixed some FreeBSD newbus
|
|
resource allocation problems (FreeBSD PR kern/18744).
|
|
|
|
2.16 19 Sep 2000 Merge in NetBSD changes from Thomas Klausner <wiz@netbsd.org>
|
|
|
|
2.17 19 Oct 2000 Alexander Langer <alex@big.endian.de> and
|
|
Daniel O'Connor <doconnor@gsoft.com.au>
|
|
both submitted fixes to devfs code.
|
|
Fix PHK's commit so we only include machine/clock.h in
|
|
FreeBSD 2.x, 3.x and 4.x systems
|
|
|
|
2.18 30 Oct 2000 Roger Hardiman - Add new ioctls to allow userland programs
|
|
fuller access to the I2C bus, BT848_MSP_READ BT848_MSP_WRITE
|
|
and BT848_MSP_RESET.
|
|
Add tuner type 0x2a. Remove 0x2c which was incorrect.
|
|
Christian Gusenbauer <Christian.Gusenbauer@netway.at> added
|
|
support for audio on Hauppauge cards without the audio mux.
|
|
The MSP is used for audio selection. (the 44xxx models)
|
|
|
|
[see https://svnweb.freebsd.org/base/head/sys/dev/bktr/
|
|
for newer change logs ]
|