Getting error "failed to setup attributes" on Adding Custom Fields in accelerometer HID driver

[s.rawat]

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.
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