[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 5c3e8ca..48550b0 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -867,6 +867,8 @@
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 @@
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 @@
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 6501c0b..60a626c 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -910,5 +910,7 @@
#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