Date: Tue, 1 May 2007 11:17:15 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: freebsd-multimedia@freebsd.org Subject: Re: pvrxxx, linux code and modules Message-ID: <20070501014715.GD47158@wantadilla.lemis.com> In-Reply-To: <20070427061016.GG73385@funkthat.com> References: <c39ec84c0704151508t126cf975gaa1957b9205d3244@mail.gmail.com> <80f4f2b20704230529s706c50a9pa4716e74c2b04182@mail.gmail.com> <20070424001346.GF45246@wantadilla.lemis.com> <80f4f2b20704241029x68e18eddgad417a71195d2666@mail.gmail.com> <c39ec84c0704151508t126cf975gaa1957b9205d3244@mail.gmail.com> <80f4f2b20704230529s706c50a9pa4716e74c2b04182@mail.gmail.com> <20070424001346.GF45246@wantadilla.lemis.com> <80f4f2b20704240519u1cedb1ady1738268947a15a3d@mail.gmail.com> <20070427054733.GF15734@wantadilla.lemis.com> <20070427061016.GG73385@funkthat.com>
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--11Y7aswkeuHtSBEs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thursday, 26 April 2007 at 23:10:16 -0700, John-Mark Gurney wrote: > Greg 'groggy' Lehey wrote this message on Fri, Apr 27, 2007 at 15:17 +0930: >>> Is it safe to assume that with these two codes, the tuner will always >>> be identifiable? (i.e. lets say a Leadtek card uses the same tuner, >>> will I be able to take one byte from the Leadtek eeprom for it's >>> eeprom code (El), and one byte for it's tuner code (Tl), and be able >>> to determine the tuner, or might I need multiple bytes for El and/or >>> Tl? Will they always be integers? Could strings be expected? >> >> My problem is that I don't know much about the tuners myself. That's >> a thing I'm planning to do when I have time. Judging by the lack of >> response from others, I'd guess that they don't have a definitive >> answer either. But from what I've heard, I suspect it's a good idea >> not to rely on anything. > > Usually tuners are broken into two parts... One is the RF side of > things that takes the antenna in, and tunes in the channel, and > converts it down to base band signal, 0-6Mhz instead of 54-60Mhz... > Then there is the demodulator that takes the base band signal in > and converts it to the digital signal that the card then buffers > and transfers to the PCI bus... Usually the RF and demodulator are > at different i2c address... > > Does this give you what you want? Not really. I'm looking for much more detail, something that driver writers can use to actually write a driver. I've started documenting the structure of the bktr driver. It'll take a while, but when I have a draft worth looking at, I'll make it available. Greg -- See complete headers for address and phone numbers. --11Y7aswkeuHtSBEs Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFGNpwjIubykFB6QiMRArobAKCalnmpY+6VViwPggGjgAzojPggTgCffcsS c8ziIvHqobCkS6hq1XXgKPA= =TuGP -----END PGP SIGNATURE----- --11Y7aswkeuHtSBEs--
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