I have modified the hid-sensor-accel_3d.c driver to add the custom fields - CHANNEL_SCAN_DATA_MOTION and HID_USAGE_SENSOR_DATA_CUSTOM_VALUEX ( X = 2,3,4). Below are my modifications : enum accel_3d_channel { CHANNEL_SCAN_INDEX_X, CHANNEL_SCAN_INDEX_Y, CHANNEL_SCAN_INDEX_Z, *CHANNEL_SCAN_DATA_MOTION,* * CHANNEL_CUSTOM_VALUE_2,* * CHANNEL_CUSTOM_VALUE_3,* * CHANNEL_CUSTOM_VALUE_4,* ACCEL_3D_CHANNEL_MAX, static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = { HID_USAGE_SENSOR_ACCEL_X_AXIS, HID_USAGE_SENSOR_ACCEL_Y_AXIS, HID_USAGE_SENSOR_ACCEL_Z_AXIS, *HID_USAGE_SENSOR_DATA_MOTION_STATE,* * HID_USAGE_SENSOR_DATA_CUSTOM_VALUE2, * * HID_USAGE_SENSOR_DATA_CUSTOM_VALUE3, * * HID_USAGE_SENSOR_DATA_CUSTOM_VALUE4* }; /* Channel definitions */ static const struct iio_chan_spec accel_3d_channels[] = { { .. .. .. *{* * .type = IIO_ACCEL,* * .modified = 1,* * .channel2 = IIO_MOD_X,* * .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),* * .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |* * BIT(IIO_CHAN_INFO_SCALE) |* * BIT(IIO_CHAN_INFO_SAMP_FREQ) |* * BIT(IIO_CHAN_INFO_HYSTERESIS),* * .scan_index = CHANNEL_SCAN_DATA_MOTION,* * },* *{* * .type = IIO_ACCEL,* * .modified = 1,* * .channel2 = IIO_MOD_X,* * .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),* * .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |* * BIT(IIO_CHAN_INFO_SCALE) |* * BIT(IIO_CHAN_INFO_SAMP_FREQ) |* * BIT(IIO_CHAN_INFO_HYSTERESIS),* * .scan_index = CHANNEL_CUSTOM_VALUE_2,* * },* * {* * .type = IIO_ACCEL,* * .modified = 1,* * .channel2 = IIO_MOD_X,* * .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),* * .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |* * BIT(IIO_CHAN_INFO_SCALE) |* * BIT(IIO_CHAN_INFO_SAMP_FREQ) |* * BIT(IIO_CHAN_INFO_HYSTERESIS),* * .scan_index = CHANNEL_CUSTOM_VALUE_3,* * },* * {* * .type = IIO_ACCEL,* * .modified = 1,* * .channel2 = IIO_MOD_X,* * .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),* * .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |* * BIT(IIO_CHAN_INFO_SCALE) |* * BIT(IIO_CHAN_INFO_SAMP_FREQ) |* * BIT(IIO_CHAN_INFO_HYSTERESIS),* * .scan_index = CHANNEL_CUSTOM_VALUE_4,* * }* /* Capture samples in local storage */ static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev, unsigned usage_id, size_t raw_len, char *raw_data, void *priv) { struct iio_dev *indio_dev = platform_get_drvdata(priv); struct accel_3d_state *accel_state = iio_priv(indio_dev); int offset; int ret = -EINVAL; switch (usage_id) { case HID_USAGE_SENSOR_ACCEL_X_AXIS: case HID_USAGE_SENSOR_ACCEL_Y_AXIS: case HID_USAGE_SENSOR_ACCEL_Z_AXIS: * case HID_USAGE_SENSOR_DATA_MOTION_STATE:* * case HID_USAGE_SENSOR_DATA_CUSTOM_VALUE2:* * case HID_USAGE_SENSOR_DATA_CUSTOM_VALUE3:* * case HID_USAGE_SENSOR_DATA_CUSTOM_VALUE4:* offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS; /* Parse report which is specific to an usage id*/ static int accel_3d_parse_report(struct platform_device *pdev, struct hid_sensor_hub_device *hsdev, struct iio_chan_spec *channels, unsigned usage_id, struct accel_3d_state *st) { int ret; int i; *for (i = 0; i <= CHANNEL_CUSTOM_VALUE_4; ++i) { //previously < CHANNEL_SCAN_INDEX_Z* ret = sensor_hub_input_get_attribute_info(hsdev, After build /insmod i get the following dmesg : *hid_sensor_accel_3d:HID-SENSOR-200073.3 auto : failed to setup attributes* *hid_sensor_accel_3d:HID-SENSOR-200073.3 auto.failed with error -1* I am not getting what else I have to modify to avoid this error .If i remove the portion in bold(and use this original code : http://lxr.free-electrons.com/source/drivers/iio/accel/hid-sensor-accel-3d.c) I can happily insert the module without any error and can interact with the driver using my application.