[media] v4l: add RF tuner channel bandwidth control

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 <hverkuil@xs4all.nl>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 5c3e8ca9b1d197e4d0840ffac5fd27bf80d4e388..48550b0eca2ee3d047d0291593a62e159fabd2af 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -867,6 +867,8 @@ const char *v4l2_ctrl_get_name(u32 id)
        case V4L2_CID_RF_TUNER_MIXER_GAIN:      return "Mixer Gain";
        case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:    return "IF Gain, Auto";
        case V4L2_CID_RF_TUNER_IF_GAIN:         return "IF Gain";
+       case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:  return "Bandwidth, Auto";
+       case V4L2_CID_RF_TUNER_BANDWIDTH:       return "Bandwidth";
        default:
                return NULL;
        }
@@ -919,6 +921,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
        case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
        case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
        case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
+       case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
                *type = V4L2_CTRL_TYPE_BOOLEAN;
                *min = 0;
                *max = *step = 1;
@@ -1084,6 +1087,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
        case V4L2_CID_RF_TUNER_LNA_GAIN:
        case V4L2_CID_RF_TUNER_MIXER_GAIN:
        case V4L2_CID_RF_TUNER_IF_GAIN:
+       case V4L2_CID_RF_TUNER_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 6501c0b2860e405fe125a09361ac3719c20fed24..60a626ca47c8c39c7174bf998f2fab4756dd1dec 100644 (file)
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -910,5 +910,7 @@ enum v4l2_deemphasis {
 #define V4L2_CID_RF_TUNER_MIXER_GAIN           (V4L2_CID_RF_TUNER_CLASS_BASE + 4)
 #define V4L2_CID_RF_TUNER_IF_GAIN_AUTO         (V4L2_CID_RF_TUNER_CLASS_BASE + 5)
 #define V4L2_CID_RF_TUNER_IF_GAIN              (V4L2_CID_RF_TUNER_CLASS_BASE + 6)
+#define V4L2_CID_RF_TUNER_BANDWIDTH_AUTO       (V4L2_CID_RF_TUNER_CLASS_BASE + 7)
+#define V4L2_CID_RF_TUNER_BANDWIDTH            (V4L2_CID_RF_TUNER_CLASS_BASE + 8)
 
 #endif