On Monday 10 January 2011 16:54:14 Andreas Oberritter wrote: > On 01/10/2011 04:07 PM, Thomas Schlöter wrote: > >>> I decided this should be supported by the kernel frontend code as it is impossible to send that special DiSEqC / voltage sequence from userspace. > >> > >> Why do you think that's impossible? There's a userspace implementation > >> in Enigma2. > > > > I think the kernel implementation would be superior for two reasons: > > - There are some timing requirements regarding the 14/18V transitions and the DiSEqC message which could perform better directly from the frontend code, > > Unless there's proof, I won't believe that. We're not talking about > nanoseconds, but milliseconds, and it's about setting registers of slow > I2C devices. The same timing requirements are valid for each and every > backwards compatible DiSEqC sequence, which is the most common setting. > > > - In many TV recording applications there is no support for SCR and it would be harder to implement in these. For VDR, there is a patch which is difficult to configure and has some technical limitations. In MythTV and XMBC I could not find any support for SCR. Their Wiki pages or forums say, that there are no plans for Unicable support as it would take huge changes. > > Many of these applications didn't or don't support DiSEqC 1.1 > (uncommittted switches) or DiSEqC 1.2 (rotor commands) or USALS. Still, > we don't put this logic into the kernel to make their life easier. Don't > add unneeded complexity to the kernel. > > Of course, one could decide to start a reusable library to take care of > that stuff. Honestly, I don't know whether such a library exists today. > > If you find the patch was simple enough to be applied to the kernel, it > must be as simple to patch your favourite application, even in a > platform independent way (not taking into account the required changes > to the UI, which have to be done anyway). Ack, this stuff should be implemented as a userspace library. (Btw, there is an experimental unicable patch for VDR.) CU Oliver -- ---------------------------------------------------------------- VDR Remote Plugin 0.4.0: http://www.escape-edv.de/endriss/vdr/ 4 MByte Mod: http://www.escape-edv.de/endriss/dvb-mem-mod/ Full-TS Mod: http://www.escape-edv.de/endriss/dvb-full-ts-mod/ ---------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
