Mauro,
Thanks.
Previously, I have done some limited test and it seem that
xc2028_signal seem to be getting the correct registered value for the
detected a signal locked.
Since I am now able to get video working(though somewhat limited since
it still crashed if i change channel from mythtv), i will be spending
more time to look getting a lock on the signal.
Is line 139,140,155,156 needed? Its slowing down the loading of
firmware and it working for me with the additional register setting.
138 if (addr == dev->tuner_addr << 1) {
139 tm6000_set_reg(dev, 0x32, 0,0);
140 tm6000_set_reg(dev, 0x33, 0,0);
141 }
142 if (i2c_debug >= 2)
143 for (byte = 0; byte < msgs[i].len; byte++)
144 printk(" %02x", msgs[i].buf[byte]);
145 } else {
146 /* write bytes */
147 if (i2c_debug >= 2)
148 for (byte = 0; byte < msgs[i].len; byte++)
149 printk(" %02x", msgs[i].buf[byte]);
150 rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
151 msgs[i].buf + 1, msgs[i].len - 1);
152
153 if (addr == dev->tuner_addr << 1) {
154 tm6000_set_reg(dev, 0x32, 0,0);
155 tm6000_set_reg(dev, 0x33, 0,0);
On Fri, Apr 23, 2010 at 4:35 AM, Mauro Carvalho Chehab
<mchehab@xxxxxxxxxx> wrote:
> Bee Hock Goh wrote:
>> Hi,
>>
>> I am trying to understand how the subdev function are triggered when I
>> use v4l2_device_call_all(&dev->v4l2_dev, 0, tuner, g_tuner,t) on
>> tm600-video.
>
> It calls tuner-core.c code, with g_tuner command. tuner-core
> checks what's the used tuner and, in the case of tm6000, calls the corresponding
> function at tuner-xc2028. This is implemented on tuner_g_tuner() function.
>
> The function basically does some sanity checks, and some common tuner code, but
> the actual implementation is handled by some callbacks that the driver needs to
> define (get_afc, get_status, is_stereo, has_signal). In general, drivers use
> get_status for it:
> fe_tuner_ops->get_status(&t->fe, &tuner_status);
>
>
> You will find a good example of how to implement such code at tuner-simple
> simple_get_status() function.
>
> In the case of tuner-xc2028, we never found a way for it to properly report the
> status of the tuner lock. That's why this function is not implemented on the driver.
>
>> How am i able to link the callback from the tuner_xc2028 function?
>
> The callback is used by tuner-xc2028 when it detects the need of changing the
> firmware (or when the firmware is not loaded yet, or when you select a standard
> that it is not supported by the current firmware).
>
> Basically, xc2028 driver will use the callback that was set previously via:
>
> v4l2_device_call_all(&dev->v4l2_dev, 0, tuner, s_config, &xc2028_cfg);
>
>
>>
>> Please help me to understand or directly me to any documentation that
>> I can read up?
>>
>> thanks,
>> Hock.
>> --
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>
>
> --
>
> Cheers,
> Mauro
>
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