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

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Date:	Fri, 20 Apr 2007 02:43:02 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	hermann pitton <hermann-pitton@...or.de>
CC:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-dvb@...uxtv.org, Michael Krufky <mkrufky@...uxtv.org>
Subject: Re: [linux-dvb] Re: [video4linux-cvs] [hg:v4l-dvb] Add support for
 Opera S1- DVB-USB

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@...enet.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.

HTH,
Manu
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