/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/ is in linux-oem-headers-4.15.0-1009 4.15.0-1009.12.
This file is owned by root:root, with mode 0o755.
..
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/accel/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/accel/kxcjk_1013.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/adc/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/adc/ad_sigma_delta.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/buffer-dma.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/buffer-dmaengine.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/buffer.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/buffer_impl.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/common/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/common/ssp_sensors.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/common/st_sensors.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/common/st_sensors_i2c.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/common/st_sensors_spi.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/configfs.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/consumer.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/dac/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/dac/ad5421.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/dac/ad5504.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/dac/ad5791.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/dac/max517.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/dac/mcp4725.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/driver.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/events.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/frequency/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/frequency/ad9523.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/frequency/adf4350.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/gyro/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/gyro/itg3200.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/iio.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/imu/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/imu/adis.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/kfifo_buf.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/machine.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/magnetometer/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/magnetometer/ak8975.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/sw_device.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/sw_trigger.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/sysfs.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/timer/
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/timer/stm32-lptim-trigger.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/timer/stm32-timer-trigger.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/trigger.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/trigger_consumer.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/triggered_buffer.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/triggered_event.h
/usr/src/linux-oem-headers-4.15.0-1009/include/linux/iio/types.h