[linux-dvb] Re: [video4linux-cvs] [hg:v4l-dvb] Add support for Opera S1- DVB-USB

Manu Abraham abraham.manu at gmail.com
Fri Apr 20 00:51:47 CEST 2007


Markus Rechberger wrote:
> On 4/20/07, Manu Abraham <abraham.manu at gmail.com> wrote:
>> hermann pitton wrote:
>> > Am Freitag, den 20.04.2007, 00:55 +0400 schrieb Manu Abraham:
>> >> Mauro Carvalho Chehab wrote:
>> >>> Em Qui, 2007-04-19 às 16:41 -0400, Michael Krufky escreveu:
>> >>>> Marco Gittler wrote:
>> >>>>> this patch has applied the hints from mkrufky (dvb_attach,
>> >>>>> firmware-naming)
>> >>>>> and also one working rewrite of the i2c addresses stuff to fit the
>> >>>>> kernel i2c reqs.
>> >>>>>
>> >>>>> Signed-off-by: Marco Gittler<g.marco at freenet.de>
>> >>>>> diff -r c8b73ec18b42 linux/drivers/media/dvb/dvb-usb/opera1.c
>> >>>>> --- a/linux/drivers/media/dvb/dvb-usb/opera1.c    Thu Apr 19
>> 12:04:50
>> 2007 -0300
>> >>>>> +++ b/linux/drivers/media/dvb/dvb-usb/opera1.c    Thu Apr 19
>> 20:38:01
>> 2007 +0200
>> >>>>> @@ -25,6 +25,13 @@
>> >>>>>  #define REG_20_SYMBOLRATE_BYTE1 0x20
>> >>>>>  #define REG_21_SYMBOLRATE_BYTE2 0x21
>> >>>>>
>> >>>>> +#define ADDR_C0_TUNER (0xc0>>1)
>> >>>>> +#define ADDR_D0_PLL (0xd0>>1)
>> >>>>>
>> >>>> I don't like these two #define's.  These i2c addresses need only be
>> >>>> specified once, in the config structs / frontendfoo_attach calls for
>> the
>> >>>> tuner / demod.
>> >>>>
>> >>>> Better to just put them in as constants like all of the other dvb
>> drivers.
>> >>> I prefer the way it is. We should really avoid having magic numbers
>> >>> inside the code. The alias here helps to know that 0x60 is tuner
>> addres
>> >>> and 0x68 the pll.
>> >>
>> >> Following a project's coding styles and conventions is "respecting" a
>> >> project
>> >>
>> >> Manu
>> >>
>> >
>> > Hi,
>> >
>> > the other natural place for this should be the LKML to get more _good_
>> > arguments, instead of hanging soon in some "respect" stuff again.
>>
>>
>> DVB drivers generally have device addresses such as tuner_addresses and
>> demod_adresses defined in a config struct least to prevent them from
>> being global, wherever the header is included, since the very same
>> device can have multiple addresses and so on, which are non-probable
>> since being behind a repeater which is switched by a demod (private) and
>> hence.
>>
>> Those are some of the reasons to follow a certain coding
>> style/conventions. They are _not_ for fun.
>>
> 
> cat *priv.h says something else too...
> there are also many global register defines in DVB drivers, they just
> don't include the register value in the define name.


*_priv.h from what i understand means private .. i don't know what you
make out from that.


HTH,
Manu



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