Here is small example what it looks like when v4l2-ctl is used.
[crope@localhost v4l2-ctl]$
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --all
Driver Info (not using libv4l2):
Driver name : rtl2832_sdr
Card type : Realtek RTL2832U SDR
Bus info : usb-0000:00:13.2-2
Driver version: 3.13.0
Capabilities : 0x85010001
Video Capture
Tuner
Read/Write
Streaming
Device Capabilities
Device Caps : 0x05010001
Video Capture
Tuner
Read/Write
Streaming
Priority: 2
Frequency for tuner 0: 0 (0.000000 MHz)
Tuner 0:
Name : ADC
Capabilities : 1 Hz freq-bands
Frequency range : 0.300000 MHz - 3.200000 MHz
Video input : 0 (SDR data: ok)
User Controls
tuner_gain (int) : min=0 max=102 step=1 default=0 value=0
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=1 --all
Driver Info (not using libv4l2):
Driver name : rtl2832_sdr
Card type : Realtek RTL2832U SDR
Bus info : usb-0000:00:13.2-2
Driver version: 3.13.0
Capabilities : 0x85010001
Video Capture
Tuner
Read/Write
Streaming
Device Capabilities
Device Caps : 0x05010001
Video Capture
Tuner
Read/Write
Streaming
Priority: 2
Frequency for tuner 1: 0 (0.000000 MHz)
Tuner 1:
Name : RF
Capabilities : 62.5 Hz freq-bands
Frequency range : 50.000 MHz - 1500.000 MHz
Video input : 0 (SDR data: ok)
User Controls
tuner_gain (int) : min=0 max=102 step=1 default=0 value=0
(reverse-i-search)`en': gedit drivers/media/radio/radio-ke^Ce.c
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=0 --list-freq-bands
ioctl: VIDIOC_ENUM_FREQ_BANDS
Index : 0
Modulation : Unknown
Capability : 1 Hz freq-bands
Frequency Range: 0.300000 MHz - 0.300000 MHz
Index : 1
Modulation : Unknown
Capability : 1 Hz freq-bands
Frequency Range: 0.900001 MHz - 2.800000 MHz
Index : 2
Modulation : Unknown
Capability : 1 Hz freq-bands
Frequency Range: 3.200000 MHz - 3.200000 MHz
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=1 --list-freq-bands
ioctl: VIDIOC_ENUM_FREQ_BANDS
Index : 0
Modulation : Unknown
Capability : 62.5 Hz freq-bands
Frequency Range: 50.000 MHz - 1500.000 MHz
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=0 --set-freq=0.300000
Frequency for tuner 0 set to 300000 (0.300000 MHz)
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=0 --get-freq
Frequency for tuner 0: 300000 (0.300000 MHz)
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=1 --set-freq=100
Frequency for tuner 1 set to 1600000 (100.000000 MHz)
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=1 --get-freq
Frequency for tuner 1: 1600000 (100.000000 MHz)
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=1 --all
Driver Info (not using libv4l2):
Driver name : rtl2832_sdr
Card type : Realtek RTL2832U SDR
Bus info : usb-0000:00:13.2-2
Driver version: 3.13.0
Capabilities : 0x85010001
Video Capture
Tuner
Read/Write
Streaming
Device Capabilities
Device Caps : 0x05010001
Video Capture
Tuner
Read/Write
Streaming
Priority: 2
Frequency for tuner 1: 1600000 (100.000000 MHz)
Tuner 1:
Name : RF
Capabilities : 62.5 Hz freq-bands
Frequency range : 50.000 MHz - 1500.000 MHz
Video input : 0 (SDR data: ok)
User Controls
tuner_gain (int) : min=0 max=102 step=1 default=0 value=0
[crope@localhost v4l2-ctl]$ ./v4l2-ctl -d /dev/sdr0 --tuner-index=0 --all
Driver Info (not using libv4l2):
Driver name : rtl2832_sdr
Card type : Realtek RTL2832U SDR
Bus info : usb-0000:00:13.2-2
Driver version: 3.13.0
Capabilities : 0x85010001
Video Capture
Tuner
Read/Write
Streaming
Device Capabilities
Device Caps : 0x05010001
Video Capture
Tuner
Read/Write
Streaming
Priority: 2
Frequency for tuner 0: 300000 (0.300000 MHz)
Tuner 0:
Name : ADC
Capabilities : 1 Hz freq-bands
Frequency range : 0.300000 MHz - 3.200000 MHz
Video input : 0 (SDR data: ok)
User Controls
tuner_gain (int) : min=0 max=102 step=1 default=0 value=0
[crope@localhost v4l2-ctl]$
Antti Palosaari (4):
v4l2-core: don't clear VIDIOC_G_FREQUENCY tuner type
v4l2: add new device type for Software Defined Radio
v4l: add new tuner types for SDR
v4l: 1 Hz resolution flag for tuners
drivers/media/v4l2-core/v4l2-dev.c | 5 +++++
drivers/media/v4l2-core/v4l2-ioctl.c | 40 +++++++++++++++++++++++++-----------
include/media/v4l2-dev.h | 3 ++-
include/uapi/linux/videodev2.h | 3 +++
4 files changed, 38 insertions(+), 13 deletions(-)
--
1.8.4.2
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