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Mauro Carvalho Chehab
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| refs/heads/master: 542b329f8e0d92ca93d033d13a9db16b89830acd | ||
| refs/heads/master: a80abc58feda48f868d748bde8c88592c2892b1d |
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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 | Singed 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 | Adjascent 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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