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

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Message-Id: <201205201152.12948.hverkuil@xs4all.nl>
Date:	Sun, 20 May 2012 11:52:12 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	manjunatha_halli@...com
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 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

> +
>  
>  /*  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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