[linux-dvb] Re: [PATCHES] Frontend kernel i2c conversion.

[Andreas Büsching <crunchy@tzi.de>]

Andreas Büsching wrote:
> Andreas Büsching wrote:
>
> > Hi,
> >
> > I just got my new DVB-T card (AverMedia 771) yesterday and ran into the 
> > same problem as Andreas. When I tried to load the mt352 module it 
> > crashed on mt352.c:827 (I guess; the line looks like 
> > BUG_ON(!state->dvb)). So I applied your patch, which definitly changed 
> > something in the behaviour. I can load the module and get the debug 
> > message 'dvbfe_mt352: Setup for Avermedia 771.'. But that seems to be 
> > everything. As I'm new to this stuff I'm not sure how to check that the 
> > card is working correctly now, but I tried the following:
> >
> > - downloaded the dvb-apps from CVS
> > - ran dvb-apps/util/scan/dvbscan ./dvb-t/de-Bremen
> >
> > what results in:
> >
> > scanning dvb-t/de-Bremen
> > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> > main:1957: FATAL: failed to open '/dev/dvb/adapter0/frontend0': 2 No 
> > such file or directory
> >
> > According to this message the mt352 is not running correctly
> >
> > Also I'm not sure if I did everything else correct with the bt* driver 
> > stuff. Currently I load the following modules:
> >
> > # DVB-T AverMedia 771
> > dvb-core
> > bttv i2c_hw=1 card=0x68
> > bt878
> > dvb-bt8xx
> > i2c-nforce2
> > i2c-algo-pcf
> >
> > I added the i2c modules because there are some syslog messages looking 
> > like errors. These messages appear while loading the mt352 module:
> >
> > i2c_adapter i2c-0: sendbytes: error - bailout.
> > i2c_adapter i2c-1: sendbytes: error - bailout.
> > i2c_adapter i2c-2: sendbytes: error - bailout.
> >
> > I hope this helps to find the bug! If you need any more information just 
> > ask.
>
> Okay here some more debug output from loding the kernel moduls like that 
> (I applied a patch to the bttv to automatically detect my AverMedia 771):
>
> dvb-core
> bttv i2c_hw=1
> bt878
> dvb-bt8xx
>
> Linux video capture interface: v1.00
> bttv: driver version 0.9.14 loaded
> bttv: using 8 buffers with 2080k (520 pages) each for capture
> bttv: Bt8xx card found (0).
> bttv0: Bt878 (rev 17) at 0000:01:07.0, irq: 12, latency: 32, mmio: 
> 0xe9000000
> bttv0: detected: AVermedia DVB-T 771 [card=121], PCI subsystem ID is 
> 1461:0771
> bttv0: using: AVerMedia AVerTV DVB-T 771 [card=121,autodetected]
> bttv0: gpio: en=00000000, out=00000000 in=00f8ff0f [init]
> bttv0: using tuner=-1
> bttv0: registered device video0
> bttv0: registered device vbi0
> bttv0: PLL: 28636363 => 35468950 . ok
> bttv0: add subdevice "remote0"
> bttv0: add subdevice "dvb0"
> bt878: AUDIO driver version 0.0.0 loaded
> bt878: Bt878 AUDIO function found (0).
> bt878(0): Bt878 (rev 17) at 01:07.1, irq: 12, latency: 32, memory: 
> 0xe9001000
> attach: checking "DDC:fb0 #0"
> attach: checking "DDC:fb0 #1"
> attach: checking "MAVEN:fb0"
> attach: checking "SMBus nForce2 adapter at 5000"
> attach: checking "SMBus nForce2 adapter at 5500"
> attach: checking "bt878 #0 [hw]"
> find by pci: checking "bt878 #0 [hw]"
> attach: "bt878 #0 [hw]", to card 0
> DVB: registering new adapter (Ave).
> dvbfe_mt352: Trying to attach to adapter 0x10009:DDC:fb0 #0.
> i2c_adapter i2c-0: sendbytes: error - bailout.
> dvbfe_mt352: Avermedia 771 not detected, maybe you should try the 
> 'force_card' module parameter?.
> dvbfe_mt352: Trying to attach to adapter 0x10009:DDC:fb0 #1.
> i2c_adapter i2c-1: sendbytes: error - bailout.
> dvbfe_mt352: Avermedia 771 not detected, maybe you should try the 
> 'force_card' module parameter?.
> dvbfe_mt352: Trying to attach to adapter 0x10009:MAVEN:fb0.
> i2c_adapter i2c-2: sendbytes: error - bailout.
> dvbfe_mt352: Avermedia 771 not detected, maybe you should try the 
> 'force_card' module parameter?.
> dvbfe_mt352: Trying to attach to adapter 0x0:SMBus nForce2 adapter at 5000.
> dvbfe_mt352: Avermedia 771 not detected, maybe you should try the 
> 'force_card' module parameter?.
> dvbfe_mt352: Trying to attach to adapter 0x0:SMBus nForce2 adapter at 5500.
> dvbfe_mt352: Avermedia 771 not detected, maybe you should try the 
> 'force_card' module parameter?.
> dvbfe_mt352: Trying to attach to adapter 0x10005:bt878 #0 [hw].
> dvbfe_mt352: Setup for Avermedia 771.
... some new information has just arrived ...

I started debugging the mt352 module (what is quite difficult as I do 
not know that much about dvb und i2c kernel stuff). What I found out is 
that the mt352_command function is never called, what results in a 
messing call to dvb_register_frontend[_new], which seems to be very 
important.

Maybe this will help to find the problem. I will do everything I can to 
help you find the bug/problem.

crunchy