[pvrusb2] Terratec Grabster AV400

[Sven Barth]

Hi again!

I checked your cx25840 code and realized that you issue two calls to the 
module, one for video and one for audio. But in the debug output is only 
one "set" message. Swaping the two calls made no difference so I checked 
the cx25840-core.c code again and the problem hit me like a lightning 
strike:

static int cx25840_s_audio_routing(struct v4l2_subdev *sd, const struct 
v4l2_routing *route)
{
        struct cx25840_state *state = to_state(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);

    // WE ARE BLOCKED HERE!!!!!!
      if (state->is_cx25836)
                return -EINVAL;
        return set_input(client, state->vid_input, route->input);
}


So I commented that if-statement and I now I get two "set" messages in 
dmesg, BUT it doesn't solve the problem... :( only the changed default 
value does.

If the cx25836 (or cx25837 in my case, according to dmesg) does not 
support audio routing (like the if-statement is suggesting) would it be 
useful to ask the v4l-devs to initialize the device with AUDIO_SERIAL? I 
will investigate this module a bit more to check its initialization...

But I won't do this today. It is getting late here (nearly midnight) ^^

Good night and greetings,
Sven