wonderful-mobile/exynos-linux-stable
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[media] v4l: add RF tuner gain controls

Browse source 
Modern silicon RF tuners used nowadays has many controllable gain
stages on signal path. Usually, but not always, there is at least
3 gain stages. Also on some cases there could be multiple gain
stages within the ones specified here. However, I think that having
these three controllable gain stages offers enough fine-tuning for
real use cases.

1) LNA gain. That is first gain just after antenna input.
2) Mixer gain. It is located quite middle of the signal path, where
RF signal is down-converted to IF/BB.
3) IF gain. That is last gain in order to adjust output signal level
to optimal level for receiving party (usually demodulator ADC).

Each gain stage could be set rather often both manual or automatic
(AGC) mode. Due to that add separate controls for controlling
operation mode.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2014-01-24 23:44:26 -03:00 • committed by Mauro Carvalho Chehab
parent 851897a4ad
commit 80807fada4
2 changed files with 26 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

11
include/uapi/linux/v4l2-controls.h
View file

@ -60,6 +60,7 @@
#define V4L2_CTRL_CLASS_IMAGE_PROC 0x009f0000 /* Image processing controls */
#define V4L2_CTRL_CLASS_DV 0x00a00000 /* Digital Video controls */
#define V4L2_CTRL_CLASS_FM_RX 0x00a10000 /* FM Receiver controls */
#define V4L2_CTRL_CLASS_RF_TUNER 0x00a20000 /* RF tuner controls */
/* User-class control IDs */
@ -897,4 +898,14 @@ enum v4l2_deemphasis {
#define V4L2_CID_RDS_RECEPTION (V4L2_CID_FM_RX_CLASS_BASE + 2)
#define V4L2_CID_RF_TUNER_CLASS_BASE (V4L2_CTRL_CLASS_RF_TUNER | 0x900)
#define V4L2_CID_RF_TUNER_CLASS (V4L2_CTRL_CLASS_RF_TUNER | 1)
#define V4L2_CID_RF_TUNER_LNA_GAIN_AUTO (V4L2_CID_RF_TUNER_CLASS_BASE + 1)
#define V4L2_CID_RF_TUNER_LNA_GAIN (V4L2_CID_RF_TUNER_CLASS_BASE + 2)
#define V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO (V4L2_CID_RF_TUNER_CLASS_BASE + 3)
#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)
#endif