Integration Issue with LSM6DSVX IMU Sensor HAL on Android 10 (i.MX Processor

[yogeshmanjashetty]

We observe mutually exclusive behavior in the LSM6DSVX driver:

1. With interrupts DISABLED:

   • Can successfully read raw values via sysfs:

     cat /sys/bus/iio/devices/iio:deviceX/in_accel_x_raw  # Returns valid data

2. With interrupts ENABLED:

   • Sysfs reads return 0:

     cat /sys/bus/iio/devices/iio:deviceX/in_accel_x_raw  # Returns 0

   • Kernel driver appears functional (interrupts fire in dmesg)

   • HAL receives flush events but no sensor data

Debugging Performed:

• Confirmed IIO buffer configuration:

  echo 1 > /sys/bus/iio/devices/iio:deviceX/buffer/enable

• Verified no resource conflicts (lsof /dev/iio:device*)

• Tested with/without FIFO mode - same behavior

Suspected Root Cause:
Driver may be locking out sysfs reads when interrupts are active, or buffer ownership isn't properly shared between interrupt and sysfs access modes.

Request:
Could you clarify:

1. Is this expected behavior in the LSM6DSVX driver?

2. Recommended workaround to allow both interrupt-driven AND sysfs access?

3. Any known patches or configuration flags to resolve this?

Additional Context:

• Kernel: ______

• HAL: android.hardware.sensors@2.0 (ST implementation)

• Platform: i.MX8MM