Structure

devices/
    {CHIP NAME}/
        overlays/
            {DEVICE NAME} <-- device specific data
        base/

Data structure

At boot time, /tmp/qcom-hexagon-fs is created from all of the below:

• the chip's base folder (eg: $SENSOR_FIRMWARE_REPO/devices/SM8750/base)
• the device's overlay folder (eg: $SENSOR_FIRMWARE_REPO/devices/SM8750/overlays/AYN Odin 3)
• a config folder on your device (/storage/.config/qcom-hexagon-fs)

Sourcing

The sensor data can be found in your the Android partitions. (probably)

For the AYN Odin 3 (SM8750), this is at: vendor/etc/sensors/ and persist/sensors/

To find out where to put these, boot your device into ROCKNIX and see what adsprpcd is complaining about:

# journalctl | grep fastrpc
apps_std_imp.c:1720:Error 0x201: apps_std_stat: failed to stat /sns_odp_config_params.bin, file open returned 0x2 (No such file or directory)
mod_table.c:909: Error 0x2: open_mod_table_handle_invoke failed for handle:0x8b4e69b0, sc:0x1f020100
apps_std_imp.c:1125: Warning: apps_std_fopen_with_env failed with 0x2 for /mnt/vendor/persist/sensors/qmi8658_usid.txt (No such file or directory)
mod_table.c:909: Error 0x2: open_mod_table_handle_invoke failed for handle:0x8b4e69b0, sc:0x13050100
apps_std_imp.c:1125: Warning: apps_std_fopen_with_env failed with 0x2 for /mnt/vendor/persist/sensors/qmi8658_coid.txt (No such file or directory)
mod_table.c:909: Error 0x2: open_mod_table_handle_invoke failed for handle:0x8b4e69b0, sc:0x13050100
apps_std_imp.c:1125: Warning: apps_std_fopen_with_env failed with 0x2 for /mnt/vendor/persist/sensors/qmi8658_coid.txt (No such file or directory)
mod_table.c:909: Error 0x2: open_mod_table_handle_invoke failed for handle:0x8b4e69b0, sc:0x13050100
apps_std_imp.c:1125: Warning: apps_std_fopen_with_env failed with 0x2 for /mnt/vendor/persist/sensors/acc_gyro_regdata.txt (No such file or directory)
mod_table.c:909: Error 0x2: open_mod_table_handle_invoke failed for handle:0x8b4e69b0, sc:0x13050100

Adding the data

NOTE: If the data is specific to the DEVICE (eg. AYN Odin 3) and not the CHIP (eg. SM8750) put it in the device's overlay folder

NOTE: Ignore the /mnt/ at the start of paths, we bind /tmp/qcom-hexagon-fs/vendor to /tmp/qcom-hexagon-fs/mnt/vendor at runtime.

As an example, for the Odin 3, the process looks like:

• We see adsprpcd is looking for a file at /mnt/vendor/persist/sensors/acc_gyro_regdata.txt (virtual path)
• The virtual path /mnt/vendor corresponds to the repo paths:
  • devices/SM8750/overlays/AYN Odin 3/vendor/ (for device specific data)
  • devices/SM8750/base/vendor (for chip generic data)
• We find acc_gyro_regdata.txt in Android's persist partition: /persist/sensors/acc_gyro_regdata.txt
• acc_gyro_regdata.txt seems like runtime data for this specific device
• Copy it to devices/SM8750/overlays/AYN Odin 3/vendor/persist/sensors/acc_gyro_regdata.txt