188 lines
8.8 KiB
Plaintext
188 lines
8.8 KiB
Plaintext
SI476x Driver Readme
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------------------------------------------------
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Copyright (C) 2013 Andrey Smirnov <andrew.smirnov@gmail.com>
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TODO for the driver
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------------------------------
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- According to the SiLabs' datasheet it is possible to update the
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firmware of the radio chip in the run-time, thus bringing it to the
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most recent version. Unfortunately I couldn't find any mentioning of
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the said firmware update for the old chips that I tested the driver
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against, so for chips like that the driver only exposes the old
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functionality.
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Parameters exposed over debugfs
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-------------------------------
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SI476x allow user to get multiple characteristics that can be very
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useful for EoL testing/RF performance estimation, parameters that have
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very little to do with V4L2 subsystem. Such parameters are exposed via
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debugfs and can be accessed via regular file I/O operations.
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The drivers exposes following files:
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* /sys/kernel/debug/<device-name>/acf
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This file contains ACF(Automatically Controlled Features) status
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information. The contents of the file is binary data of the
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following layout:
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Offset | Name | Description
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====================================================================
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0x00 | blend_int | Flag, set when stereo separation has
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| | crossed below the blend threshold
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--------------------------------------------------------------------
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0x01 | hblend_int | Flag, set when HiBlend cutoff
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| | frequency is lower than threshold
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--------------------------------------------------------------------
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0x02 | hicut_int | Flag, set when HiCut cutoff
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| | frequency is lower than threshold
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--------------------------------------------------------------------
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0x03 | chbw_int | Flag, set when channel filter
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| | bandwidth is less than threshold
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--------------------------------------------------------------------
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0x04 | softmute_int | Flag indicating that softmute
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| | attenuation has increased above
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| | softmute threshold
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--------------------------------------------------------------------
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0x05 | smute | 0 - Audio is not soft muted
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| | 1 - Audio is soft muted
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--------------------------------------------------------------------
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0x06 | smattn | Soft mute attenuation level in dB
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--------------------------------------------------------------------
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0x07 | chbw | Channel filter bandwidth in kHz
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--------------------------------------------------------------------
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0x08 | hicut | HiCut cutoff frequency in units of
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| | 100Hz
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--------------------------------------------------------------------
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0x09 | hiblend | HiBlend cutoff frequency in units
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| | of 100 Hz
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--------------------------------------------------------------------
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0x10 | pilot | 0 - Stereo pilot is not present
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| | 1 - Stereo pilot is present
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--------------------------------------------------------------------
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0x11 | stblend | Stereo blend in %
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--------------------------------------------------------------------
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* /sys/kernel/debug/<device-name>/rds_blckcnt
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This file contains statistics about RDS receptions. It's binary data
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has the following layout:
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Offset | Name | Description
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====================================================================
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0x00 | expected | Number of expected RDS blocks
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--------------------------------------------------------------------
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0x02 | received | Number of received RDS blocks
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--------------------------------------------------------------------
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0x04 | uncorrectable | Number of uncorrectable RDS blocks
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--------------------------------------------------------------------
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* /sys/kernel/debug/<device-name>/agc
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This file contains information about parameters pertaining to
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AGC(Automatic Gain Control)
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The layout is:
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Offset | Name | Description
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====================================================================
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0x00 | mxhi | 0 - FM Mixer PD high threshold is
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| | not tripped
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| | 1 - FM Mixer PD high threshold is
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| | tripped
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--------------------------------------------------------------------
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0x01 | mxlo | ditto for FM Mixer PD low
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--------------------------------------------------------------------
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0x02 | lnahi | ditto for FM LNA PD high
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--------------------------------------------------------------------
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0x03 | lnalo | ditto for FM LNA PD low
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--------------------------------------------------------------------
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0x04 | fmagc1 | FMAGC1 attenuator resistance
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| | (see datasheet for more detail)
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--------------------------------------------------------------------
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0x05 | fmagc2 | ditto for FMAGC2
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--------------------------------------------------------------------
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0x06 | pgagain | PGA gain in dB
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--------------------------------------------------------------------
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0x07 | fmwblang | FM/WB LNA Gain in dB
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--------------------------------------------------------------------
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* /sys/kernel/debug/<device-name>/rsq
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This file contains information about parameters pertaining to
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RSQ(Received Signal Quality)
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The layout is:
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Offset | Name | Description
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====================================================================
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0x00 | multhint | 0 - multipath value has not crossed
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| | the Multipath high threshold
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| | 1 - multipath value has crossed
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| | the Multipath high threshold
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--------------------------------------------------------------------
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0x01 | multlint | ditto for Multipath low threshold
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--------------------------------------------------------------------
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0x02 | snrhint | 0 - received signal's SNR has not
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| | crossed high threshold
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| | 1 - received signal's SNR has
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| | crossed high threshold
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--------------------------------------------------------------------
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0x03 | snrlint | ditto for low threshold
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--------------------------------------------------------------------
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0x04 | rssihint | ditto for RSSI high threshold
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--------------------------------------------------------------------
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0x05 | rssilint | ditto for RSSI low threshold
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--------------------------------------------------------------------
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0x06 | bltf | Flag indicating if seek command
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| | reached/wrapped seek band limit
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--------------------------------------------------------------------
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0x07 | snr_ready | Indicates that SNR metrics is ready
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--------------------------------------------------------------------
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0x08 | rssiready | ditto for RSSI metrics
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--------------------------------------------------------------------
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0x09 | injside | 0 - Low-side injection is being used
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| | 1 - High-side injection is used
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--------------------------------------------------------------------
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0x10 | afcrl | Flag indicating if AFC rails
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--------------------------------------------------------------------
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0x11 | valid | Flag indicating if channel is valid
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--------------------------------------------------------------------
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0x12 | readfreq | Current tuned frequency
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--------------------------------------------------------------------
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0x14 | freqoff | Signed frequency offset in units of
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| | 2ppm
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--------------------------------------------------------------------
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0x15 | rssi | Signed value of RSSI in dBuV
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--------------------------------------------------------------------
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0x16 | snr | Signed RF SNR in dB
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--------------------------------------------------------------------
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0x17 | issi | Signed Image Strength Signal
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| | indicator
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--------------------------------------------------------------------
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0x18 | lassi | Signed Low side adjacent Channel
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| | Strength indicator
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--------------------------------------------------------------------
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0x19 | hassi | ditto fpr High side
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--------------------------------------------------------------------
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0x20 | mult | Multipath indicator
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--------------------------------------------------------------------
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0x21 | dev | Frequency deviation
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--------------------------------------------------------------------
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0x24 | assi | Adjacent channel SSI
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--------------------------------------------------------------------
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0x25 | usn | Ultrasonic noise indicator
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--------------------------------------------------------------------
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0x26 | pilotdev | Pilot deviation in units of 100 Hz
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--------------------------------------------------------------------
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0x27 | rdsdev | ditto for RDS
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--------------------------------------------------------------------
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0x28 | assidev | ditto for ASSI
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--------------------------------------------------------------------
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0x29 | strongdev | Frequency deviation
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--------------------------------------------------------------------
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0x30 | rdspi | RDS PI code
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--------------------------------------------------------------------
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* /sys/kernel/debug/<device-name>/rsq_primary
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This file contains information about parameters pertaining to
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RSQ(Received Signal Quality) for primary tuner only. Layout is as
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the one above.
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