Stefan Ringel wrote:
> Am 08.02.2010 18:34, schrieb Stefan Ringel:
>> Am 08.02.2010 18:29, schrieb Mauro Carvalho Chehab:
>>
>>> Stefan Ringel wrote:
>>>
>>>
>>>> Am 08.02.2010 12:37, schrieb Mauro Carvalho Chehab:
>>>>
>>>>
>>>>> Mauro Carvalho Chehab wrote:
>>>>>
>>>>>
>>>>>
>>>>>>> + tm6000_read_write_usb (dev, 0xc0, 0x10, 0x7f1f, 0x0000,
>>>>>>> buf, 2);
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Most of the calls there are read (0xc0). I don't know any device that
>>>>>> requires
>>>>>> a read for it to work. I suspect that the above code is just probing to
>>>>>> check
>>>>>> what i2c devices are found at the board.
>>>>>>
>>>>>>
>>>>>>
>>>>> Btw, by looking at drivers/media/dvb/frontends/zl10353_priv.h, we have an
>>>>> idea
>>>>> on what the above does:
>>>>>
>>>>> The register 0x7f is:
>>>>>
>>>>> CHIP_ID = 0x7F,
>>>>>
>>>>> So, basically, the above code is reading the ID of the chip, likely to be
>>>>> sure that it
>>>>> is a Zarlink 10353.
>>>>>
>>>>> Cheers,
>>>>> Mauro
>>>>> --
>>>>> To unsubscribe from this list: send the line "unsubscribe linux-media" in
>>>>> the body of a message to majord...@vger.kernel.org
>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>>>>
>>>>>
>>>>>
>>>> yes, but that's for activating Zarlink zl10353 and checking it --> hello
>>>> Zarlink? If doesn't use that sequence, then cannot use Zarlink zl10353.
>>>>
>>>>
>>>>
>>> Are you sure about that? Is this a new bug on tm6000?
>>>
>>> Anyway, the proper place for such code is inside zl10353 driver, not
>>> outside.
>>>
>>>
>>>
>> It cannot activate after load xc3028 firmware.
>>
>>
> That part is I think it's board specific or tm6010.
>
Probably yet-another-i2c-bug-on-tm6000... Ah, well...
then, convert this call into an i2c call. You may get one example of such in
em28xx-cards.
In that specific case, em28xx-based webcams can be shipped with more than one
different
sensor. So, the driver needs to read the sensor from I2C:
rc = i2c_master_recv(&dev->i2c_client, (char *)&version_be, 2);
if (rc != 2)
return -EINVAL;
Of course, you need to be sure to register the i2c bus before calling
i2c_master_recv.
--
Cheers,
Mauro
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
