| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | SI476x Driver Readme |
| 2 | ------------------------------------------------ |
| 3 | Copyright (C) 2013 Andrey Smirnov <andrew.smirnov@gmail.com> |
| 4 | |
| 5 | TODO for the driver |
| 6 | ------------------------------ |
| 7 | |
| 8 | - According to the SiLabs' datasheet it is possible to update the |
| 9 | firmware of the radio chip in the run-time, thus bringing it to the |
| 10 | most recent version. Unfortunately I couldn't find any mentioning of |
| 11 | the said firmware update for the old chips that I tested the driver |
| 12 | against, so for chips like that the driver only exposes the old |
| 13 | functionality. |
| 14 | |
| 15 | |
| 16 | Parameters exposed over debugfs |
| 17 | ------------------------------- |
| 18 | SI476x allow user to get multiple characteristics that can be very |
| 19 | useful for EoL testing/RF performance estimation, parameters that have |
| 20 | very little to do with V4L2 subsystem. Such parameters are exposed via |
| 21 | debugfs and can be accessed via regular file I/O operations. |
| 22 | |
| 23 | The drivers exposes following files: |
| 24 | |
| 25 | * /sys/kernel/debug/<device-name>/acf |
| 26 | This file contains ACF(Automatically Controlled Features) status |
| 27 | information. The contents of the file is binary data of the |
| 28 | following layout: |
| 29 | |
| 30 | Offset | Name | Description |
| 31 | ==================================================================== |
| 32 | 0x00 | blend_int | Flag, set when stereo separation has |
| 33 | | | crossed below the blend threshold |
| 34 | -------------------------------------------------------------------- |
| 35 | 0x01 | hblend_int | Flag, set when HiBlend cutoff |
| 36 | | | frequency is lower than threshold |
| 37 | -------------------------------------------------------------------- |
| 38 | 0x02 | hicut_int | Flag, set when HiCut cutoff |
| 39 | | | frequency is lower than threshold |
| 40 | -------------------------------------------------------------------- |
| 41 | 0x03 | chbw_int | Flag, set when channel filter |
| 42 | | | bandwidth is less than threshold |
| 43 | -------------------------------------------------------------------- |
| 44 | 0x04 | softmute_int | Flag indicating that softmute |
| 45 | | | attenuation has increased above |
| 46 | | | softmute threshold |
| 47 | -------------------------------------------------------------------- |
| 48 | 0x05 | smute | 0 - Audio is not soft muted |
| 49 | | | 1 - Audio is soft muted |
| 50 | -------------------------------------------------------------------- |
| 51 | 0x06 | smattn | Soft mute attenuation level in dB |
| 52 | -------------------------------------------------------------------- |
| 53 | 0x07 | chbw | Channel filter bandwidth in kHz |
| 54 | -------------------------------------------------------------------- |
| 55 | 0x08 | hicut | HiCut cutoff frequency in units of |
| 56 | | | 100Hz |
| 57 | -------------------------------------------------------------------- |
| 58 | 0x09 | hiblend | HiBlend cutoff frequency in units |
| 59 | | | of 100 Hz |
| 60 | -------------------------------------------------------------------- |
| 61 | 0x10 | pilot | 0 - Stereo pilot is not present |
| 62 | | | 1 - Stereo pilot is present |
| 63 | -------------------------------------------------------------------- |
| 64 | 0x11 | stblend | Stereo blend in % |
| 65 | -------------------------------------------------------------------- |
| 66 | |
| 67 | |
| 68 | * /sys/kernel/debug/<device-name>/rds_blckcnt |
| 69 | This file contains statistics about RDS receptions. It's binary data |
| 70 | has the following layout: |
| 71 | |
| 72 | Offset | Name | Description |
| 73 | ==================================================================== |
| 74 | 0x00 | expected | Number of expected RDS blocks |
| 75 | -------------------------------------------------------------------- |
| 76 | 0x02 | received | Number of received RDS blocks |
| 77 | -------------------------------------------------------------------- |
| 78 | 0x04 | uncorrectable | Number of uncorrectable RDS blocks |
| 79 | -------------------------------------------------------------------- |
| 80 | |
| 81 | * /sys/kernel/debug/<device-name>/agc |
| 82 | This file contains information about parameters pertaining to |
| 83 | AGC(Automatic Gain Control) |
| 84 | |
| 85 | The layout is: |
| 86 | Offset | Name | Description |
| 87 | ==================================================================== |
| 88 | 0x00 | mxhi | 0 - FM Mixer PD high threshold is |
| 89 | | | not tripped |
| 90 | | | 1 - FM Mixer PD high threshold is |
| 91 | | | tripped |
| 92 | -------------------------------------------------------------------- |
| 93 | 0x01 | mxlo | ditto for FM Mixer PD low |
| 94 | -------------------------------------------------------------------- |
| 95 | 0x02 | lnahi | ditto for FM LNA PD high |
| 96 | -------------------------------------------------------------------- |
| 97 | 0x03 | lnalo | ditto for FM LNA PD low |
| 98 | -------------------------------------------------------------------- |
| 99 | 0x04 | fmagc1 | FMAGC1 attenuator resistance |
| 100 | | | (see datasheet for more detail) |
| 101 | -------------------------------------------------------------------- |
| 102 | 0x05 | fmagc2 | ditto for FMAGC2 |
| 103 | -------------------------------------------------------------------- |
| 104 | 0x06 | pgagain | PGA gain in dB |
| 105 | -------------------------------------------------------------------- |
| 106 | 0x07 | fmwblang | FM/WB LNA Gain in dB |
| 107 | -------------------------------------------------------------------- |
| 108 | |
| 109 | * /sys/kernel/debug/<device-name>/rsq |
| 110 | This file contains information about parameters pertaining to |
| 111 | RSQ(Received Signal Quality) |
| 112 | |
| 113 | The layout is: |
| 114 | Offset | Name | Description |
| 115 | ==================================================================== |
| 116 | 0x00 | multhint | 0 - multipath value has not crossed |
| 117 | | | the Multipath high threshold |
| 118 | | | 1 - multipath value has crossed |
| 119 | | | the Multipath high threshold |
| 120 | -------------------------------------------------------------------- |
| 121 | 0x01 | multlint | ditto for Multipath low threshold |
| 122 | -------------------------------------------------------------------- |
| 123 | 0x02 | snrhint | 0 - received signal's SNR has not |
| 124 | | | crossed high threshold |
| 125 | | | 1 - received signal's SNR has |
| 126 | | | crossed high threshold |
| 127 | -------------------------------------------------------------------- |
| 128 | 0x03 | snrlint | ditto for low threshold |
| 129 | -------------------------------------------------------------------- |
| 130 | 0x04 | rssihint | ditto for RSSI high threshold |
| 131 | -------------------------------------------------------------------- |
| 132 | 0x05 | rssilint | ditto for RSSI low threshold |
| 133 | -------------------------------------------------------------------- |
| 134 | 0x06 | bltf | Flag indicating if seek command |
| 135 | | | reached/wrapped seek band limit |
| 136 | -------------------------------------------------------------------- |
| 137 | 0x07 | snr_ready | Indicates that SNR metrics is ready |
| 138 | -------------------------------------------------------------------- |
| 139 | 0x08 | rssiready | ditto for RSSI metrics |
| 140 | -------------------------------------------------------------------- |
| 141 | 0x09 | injside | 0 - Low-side injection is being used |
| 142 | | | 1 - High-side injection is used |
| 143 | -------------------------------------------------------------------- |
| 144 | 0x10 | afcrl | Flag indicating if AFC rails |
| 145 | -------------------------------------------------------------------- |
| 146 | 0x11 | valid | Flag indicating if channel is valid |
| 147 | -------------------------------------------------------------------- |
| 148 | 0x12 | readfreq | Current tuned frequency |
| 149 | -------------------------------------------------------------------- |
| 150 | 0x14 | freqoff | Signed frequency offset in units of |
| 151 | | | 2ppm |
| 152 | -------------------------------------------------------------------- |
| 153 | 0x15 | rssi | Signed value of RSSI in dBuV |
| 154 | -------------------------------------------------------------------- |
| 155 | 0x16 | snr | Signed RF SNR in dB |
| 156 | -------------------------------------------------------------------- |
| 157 | 0x17 | issi | Signed Image Strength Signal |
| 158 | | | indicator |
| 159 | -------------------------------------------------------------------- |
| 160 | 0x18 | lassi | Signed Low side adjacent Channel |
| 161 | | | Strength indicator |
| 162 | -------------------------------------------------------------------- |
| 163 | 0x19 | hassi | ditto fpr High side |
| 164 | -------------------------------------------------------------------- |
| 165 | 0x20 | mult | Multipath indicator |
| 166 | -------------------------------------------------------------------- |
| 167 | 0x21 | dev | Frequency deviation |
| 168 | -------------------------------------------------------------------- |
| 169 | 0x24 | assi | Adjacent channel SSI |
| 170 | -------------------------------------------------------------------- |
| 171 | 0x25 | usn | Ultrasonic noise indicator |
| 172 | -------------------------------------------------------------------- |
| 173 | 0x26 | pilotdev | Pilot deviation in units of 100 Hz |
| 174 | -------------------------------------------------------------------- |
| 175 | 0x27 | rdsdev | ditto for RDS |
| 176 | -------------------------------------------------------------------- |
| 177 | 0x28 | assidev | ditto for ASSI |
| 178 | -------------------------------------------------------------------- |
| 179 | 0x29 | strongdev | Frequency deviation |
| 180 | -------------------------------------------------------------------- |
| 181 | 0x30 | rdspi | RDS PI code |
| 182 | -------------------------------------------------------------------- |
| 183 | |
| 184 | * /sys/kernel/debug/<device-name>/rsq_primary |
| 185 | This file contains information about parameters pertaining to |
| 186 | RSQ(Received Signal Quality) for primary tuner only. Layout is as |
| 187 | the one above. |