On 09/17/2013 11:29 PM, Peter Meerwald wrote:
> Hello,
>
> why the following code in drivers/iio/imu/adis16400_core.c?
>
> static const unsigned long adis16400_burst_scan_mask[] = {
> ~0UL,
> 0,
> };
>
> [...]
>
> if (!(st->variant->flags & ADIS16400_NO_BURST))
> indio_dev->available_scan_masks = adis16400_burst_scan_mask;
>
>
> isn't the all-1 scan mask the same as not applying any scan mask?
A scan mask where all bits are set means that sampling can only be done with
all channels enabled at once. Userspace can still only select a subset of
these channels and the kernel will take care of properly demuxing the stream.
- Lars
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