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[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.

Antti Palosaari committed 12 years ago

Commit 3ce569f1 parent 30845f72 files · +6 −0Browse files

Unified · Split

2 files
  1. drivers/media/v4l2-core/v4l2-ctrls.c +4 −0
  2. include/uapi/linux/v4l2-controls.h +2 −0
drivers/media/v4l2-core/v4l2-ctrls.c+4−0
@@ -867,6 +867,8 @@ const char *v4l2_ctrl_get_name(u32 id) · 866 unmodified lines
867 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";867 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
868 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";868 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
869 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";869 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
870 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
871 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
870 default:872 default:
871 return NULL;873 return NULL;
872 }874 }
@@ -919,6 +921,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, · 46 unmodified lines
919 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:921 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
920 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:922 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
921 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:923 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
924 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
922 *type = V4L2_CTRL_TYPE_BOOLEAN;925 *type = V4L2_CTRL_TYPE_BOOLEAN;
923 *min = 0;926 *min = 0;
924 *max = *step = 1;927 *max = *step = 1;
@@ -1084,6 +1087,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, · 159 unmodified lines
1084 case V4L2_CID_RF_TUNER_LNA_GAIN:1087 case V4L2_CID_RF_TUNER_LNA_GAIN:
1085 case V4L2_CID_RF_TUNER_MIXER_GAIN:1088 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1086 case V4L2_CID_RF_TUNER_IF_GAIN:1089 case V4L2_CID_RF_TUNER_IF_GAIN:
1090 case V4L2_CID_RF_TUNER_BANDWIDTH:
1087 *flags |= V4L2_CTRL_FLAG_SLIDER;1091 *flags |= V4L2_CTRL_FLAG_SLIDER;
1088 break;1092 break;
1089 case V4L2_CID_PAN_RELATIVE:1093 case V4L2_CID_PAN_RELATIVE:
include/uapi/linux/v4l2-controls.h+2−0
@@ -910,5 +910,7 @@ enum v4l2_deemphasis { · 909 unmodified lines
910#define V4L2_CID_RF_TUNER_MIXER_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE + 4)910#define V4L2_CID_RF_TUNER_MIXER_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE + 4)
911#define V4L2_CID_RF_TUNER_IF_GAIN_AUTO (V4L2_CID_RF_TUNER_CLASS_BASE + 5)911#define V4L2_CID_RF_TUNER_IF_GAIN_AUTO (V4L2_CID_RF_TUNER_CLASS_BASE + 5)
912#define V4L2_CID_RF_TUNER_IF_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE + 6)912#define V4L2_CID_RF_TUNER_IF_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE + 6)
913#define V4L2_CID_RF_TUNER_BANDWIDTH_AUTO (V4L2_CID_RF_TUNER_CLASS_BASE + 7)
914#define V4L2_CID_RF_TUNER_BANDWIDTH (V4L2_CID_RF_TUNER_CLASS_BASE + 8)
913 915
914#endif916#endif