On 02/10/2014 05:17 PM, Antti Palosaari wrote:
> Modern silicon RF tuners has one or more adjustable filters on
> signal path, in order to filter noise from desired radio channel.
>
> Add channel bandwidth control to tell the driver which is radio
> channel width we want receive. Filters could be then adjusted by
> the driver or hardware, using RF frequency and channel bandwidth
> as a base of filter calculations.
>
> On automatic mode (normal mode), bandwidth is calculated from sampling
> rate or tuning info got from userspace. That new control gives
> possibility to set manual mode and let user have more control for
> filters.
>
> Cc: Hans Verkuil <hverk...@xs4all.nl>
> Signed-off-by: Antti Palosaari <cr...@iki.fi>
> ---
> drivers/media/v4l2-core/v4l2-ctrls.c | 4 ++++
> include/uapi/linux/v4l2-controls.h | 2 ++
> 2 files changed, 6 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c
> b/drivers/media/v4l2-core/v4l2-ctrls.c
> index d201f61..e44722b 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -865,6 +865,8 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_MIXER_GAIN: return "Mixer Gain";
> case V4L2_CID_IF_GAIN_AUTO: return "IF Gain, Auto";
> case V4L2_CID_IF_GAIN: return "IF Gain";
> + case V4L2_CID_BANDWIDTH_AUTO: return "Channel Bandwidth,
> Auto";
> + case V4L2_CID_BANDWIDTH: return "Channel Bandwidth";
> default:
> return NULL;
> }
> @@ -917,6 +919,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum
> v4l2_ctrl_type *type,
> case V4L2_CID_LNA_GAIN_AUTO:
> case V4L2_CID_MIXER_GAIN_AUTO:
> case V4L2_CID_IF_GAIN_AUTO:
> + case V4L2_CID_BANDWIDTH_AUTO:
> *type = V4L2_CTRL_TYPE_BOOLEAN;
> *min = 0;
> *max = *step = 1;
> @@ -1078,6 +1081,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum
> v4l2_ctrl_type *type,
> case V4L2_CID_LNA_GAIN:
> case V4L2_CID_MIXER_GAIN:
> case V4L2_CID_IF_GAIN:
> + case V4L2_CID_BANDWIDTH:
> *flags |= V4L2_CTRL_FLAG_SLIDER;
> break;
> case V4L2_CID_PAN_RELATIVE:
> diff --git a/include/uapi/linux/v4l2-controls.h
> b/include/uapi/linux/v4l2-controls.h
> index 076fa34..3cf68a6 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -905,5 +905,7 @@ enum v4l2_deemphasis {
> #define V4L2_CID_MIXER_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE +
> 4)
> #define V4L2_CID_IF_GAIN_AUTO
> (V4L2_CID_RF_TUNER_CLASS_BASE + 5)
> #define V4L2_CID_IF_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE +
> 6)
> +#define V4L2_CID_BANDWIDTH_AUTO
> (V4L2_CID_RF_TUNER_CLASS_BASE + 7)
> +#define V4L2_CID_BANDWIDTH (V4L2_CID_RF_TUNER_CLASS_BASE +
> 8)
This definitely needs a prefix. Bandwidth can refer to so many things that
we have to be clear here.
Hans
>
> #endif
>
--
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