[...]

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+               return dev_err_probe(dev, err, "cannot enable push-pull int\n");  

interrupt  

It will be more ugly due 80 symbols restriction.

These days we let that stretch a little for cases like these.

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+       indio_dev->modes = 0; /* setup buffered mode later */  

Why explicit assignment to 0? Doesn't kzalloc() do it for you?  

kzalloc() will do it for me, of course. Previously, I initialized modes to
INDIO_DIRECT_MODE to just provide default value for that. Jonathan
suggested to replace it with 0. 

I did?  I wonder what I was smoking that day. 
Should be set to INDIO_DIRECT_MODE as you had it previously.

(From what I recall it will work either way but we have in the past had
core code that checked this and may do again in the future so drivers should
still be setting it to specify they provide sysfs interfaces to directly read
the channels).

I can remove this line at all, no problem.
I just thought, it's more readable.