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