linux-kernel - Re: [PATCH V6 2/5] New control class and features for FM RX

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Message-ID: <CAMT6Pyd6e8zgkLEk_dpGTxiPZDippDe_YgedNRpUkJzA9X5hvw@mail.gmail.com>
Date:	Mon, 21 May 2012 12:14:37 -0500
From:	halli manjunatha <hallimanju@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Manjunatha Halli <x0130808@...com>, mchehab@...hat.com,
	Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH V6 2/5] New control class and features for FM RX

On Sun, May 20, 2012 at 4:52 AM, Hans Verkuil <hverkuil@...all.nl> wrote:
> On Tue May 15 2012 00:01:50 manjunatha_halli@...com wrote:
>> From: Manjunatha Halli <x0130808@...com>
>>
>> This patch creates new ctrl class for FM RX and adds new CID's for
>> below FM features,
>>       1) De-Emphasis filter mode
>>       2) RDS Alternate Frequency switch
>>
>> Also this patch adds a field for band selection in struct v4l2_hw_freq_seek
>> and adds new capability flags for all below FM bands
>>       1) V4L2_TUNER_CAP_BAND_TYPE_DEFAULT -> Default Band
>>       2) V4L2_TUNER_CAP_BAND_TYPE_EUROPE_US -> Europe/US Band
>>       3) V4L2_TUNER_CAP_BAND_TYPE_JAPAN   -> Japan Band
>>       4) V4L2_TUNER_CAP_BAND_TYPE_RUSSIAN -> Russian Band
>>       5) V4L2_TUNER_CAP_BAND_TYPE_WEATHER -> Weather Band
>>
>> Signed-off-by: Manjunatha Halli <x0130808@...com>
>> ---
>>  drivers/media/video/v4l2-ctrls.c |   17 ++++++++++++++---
>>  include/linux/videodev2.h        |   24 +++++++++++++++++++++++-
>>  2 files changed, 37 insertions(+), 4 deletions(-)
>>
>> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
>> index c9c9a46..7b3dd95 100644
>> --- a/include/linux/videodev2.h
>> +++ b/include/linux/videodev2.h
>
> ...
>
>> @@ -1819,6 +1827,12 @@ struct v4l2_modulator {
>>  #define V4L2_TUNER_CAP_RDS           0x0080
>>  #define V4L2_TUNER_CAP_RDS_BLOCK_IO  0x0100
>>  #define V4L2_TUNER_CAP_RDS_CONTROLS  0x0200
>> +#define V4L2_TUNER_CAP_BAND_TYPE_DEFAULT     0x00000000      /* Default band */
>> +#define V4L2_TUNER_CAP_BAND_TYPE_EUROPE_US   0x00010000      /* Europe/US band */
>> +#define V4L2_TUNER_CAP_BAND_TYPE_JAPAN               0x00020000      /* Japan band */
>> +#define V4L2_TUNER_CAP_BAND_TYPE_RUSSIAN     0x00030000      /* Russian band */
>> +#define V4L2_TUNER_CAP_BAND_TYPE_WEATHER     0x00040000      /* Weather band */
>
> Argh! These capabilities are wrong: these should have been 0x10000, 0x20000,
> 0x40000 and 0x80000! Bits that you can OR together.
>
> Also, I think _TYPE can be dropped here, just as we did for the V4L2_FM_BAND
> defines below.
>
> V4L2_TUNER_CAP_BAND_TYPE_DEFAULT is useless as a capability and should be
> dropped.
>
> Manju, I would recommend that you split off the frequency band handling from
> the other patches. Based on an RFC from Hans de Goede regarding work on the AM
> band I believe we need to postpone this part for 3.6. The other patches in this
> series not related to frequency bands are fine and you can keep my Acked-by
> there.
>
> Mauro, if you intended to merge Manjunatha's patches for 3.5, then please wait
> with merging them until he had a chance to split off the frequency band bits.
>
> Regards,
>
>        Hans

Hans, Now I have sent the patch set V7 without the frequency handling part.
I will send the frequency handling patches once we come to a
conclusion for AM and FM
bands with Hans de Goede :)

>
>> +
>>
>>  /*  Flags for the 'rxsubchans' field */
>>  #define V4L2_TUNER_SUB_MONO          0x0001
>> @@ -1843,13 +1857,21 @@ struct v4l2_frequency {
>>       __u32                 reserved[8];
>>  };
>>
>> +
>> +#define V4L2_FM_BAND_DEFAULT 0
>> +#define V4L2_FM_BAND_EUROPE_US       1       /* 87.5 Mhz - 108 MHz */
>> +#define V4L2_FM_BAND_JAPAN   2       /* 76 MHz - 90 MHz */
>> +#define V4L2_FM_BAND_RUSSIAN 3       /* 65.8 MHz - 74 MHz */
>> +#define V4L2_FM_BAND_WEATHER 4       /* 162.4 MHz - 162.55 MHz */
>> +
>>  struct v4l2_hw_freq_seek {
>>       __u32                 tuner;
>>       enum v4l2_tuner_type  type;
>>       __u32                 seek_upward;
>>       __u32                 wrap_around;
>>       __u32                 spacing;
>> -     __u32                 reserved[7];
>> +     __u32                 band;
>> +     __u32                 reserved[6];
>>  };
>>
>>  /*
>>
> --
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-- 
Regards
Halli
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