[linux-dvb] Re: mt352 and SkyStar2 (FlexCop IIB) oddities

["BStiddien@XentoniX.net" <BStiddien@XentoniX.net>]

Johannes Stezenbach wrote:

> BStiddien@XentoniX.net wrote:
>  
> > Hello,
> > I'm currently stuck on making the mt352 driver work with my TechniSat 
> > AirStar2 DVB-T card.
> > That card uses the mt352 chip with some Samsung tuner.
> > I came across this forum when I googled a bit:
> > http://pvrguide.no-ip.com/bbs-old/viewtopic.php?t=3413
> > This TechniSat card uses the same tuner as mentioned in the post 
> > (TDTC9251DH01C),
> > I've went through the whole mt352 module and compared everything with 
> > the design manual of the mt352 (e.g. I checked the whole 
> > mt352_set_parameters function to check if the module provides correct 
> > data with the tuner), but I simply don't know if those tuner-dependent 
> > variables work with the Samsung tuner (don't think so after my 
> > investigations).
> > My question now is: Did you get any information (emailing Samsung or so) 
> > for this tuner?
> >
> > Also, I found some oddities when looking at the mt352 driver.
> > The TechniSat AirStar2 uses a FlexCop IIB b2c2 chip that works with the 
> > SkyStar2 module, but in the linuxtv cvs-tree the skystar2.c has the 
> > following check in master_xfer:
> > if ((msgs[i].addr != 0x0e) && (msgs[i].addr != 0x0f) && (msgs[i].addr != 
> > 0x68) && (msgs[i].addr != 0x61))
> > but the I2C address of the mt352 is/defaults to 0x0f, which causes the 
> > whole module to fail transferring any I2C messages.
> > Adding 0x0f to that if solves this error.
> >
> > Another oddity - in master_xfer too - is the following:
> > // read command
> > if ((num == 2) && (msgs[0].flags == 0) && (msgs[1].flags == I2C_M_RD) && 
> > (msgs[0].buf != NULL) && (msgs[1].buf != NULL))
> >
> > In mt352.c the read command is contains the following:
> >     struct i2c_msg msg [] = { { .addr = I2C_MT352_ADDR,
> >                                 .flags = I2C_M_NOSTART,
> >                                 .buf = b0, .len = 1 },
> >                               { .addr = I2C_MT352_ADDR,
> >                                 .flags = I2C_M_RD,
> >                                 .buf = b1, .len = 1 } };
> >
> > as I2C_M_NOSTART isn't defined as 0 every read_register command will 
> > fail too.
> > Changing I2C_M_NOSTART to 0 solves the problem and the module can read 
> > the mt352 registers successfully.
> >
> > Looking forward to hear some comments/explanations or so.
> >    
> No explanation from my side, but Antonio Mancuso sent me a patch
> for the AirStar2 with TDTC9251DH01C frontend , but it was done against
> the outdated linux_2_4 branch. He promised to update his patch once I
> updated the drivers in the linux_2_4 branch. See also
> http://www.linuxtv.org/mailinglists/linux-dvb/2004/04-2004/msg00080.html
>
> Thanks for sharing your insights.
>
> Johannes
>
>
>  
I took a look at that url and I can say that the I2C address of the 
mt352 and the tuner seem to be correct (atleast for the mt352, since it 
responds),
looking forward to see Antonio Mancuso's patch for 2.6.

Thanks for replying.

Björn