hid-core contains the following bit of code in hid_input_report:
if (hid->claimed & HID_CLAIMED_HIDDEV)
hiddev_report_event(hid, report);
for (n = 0; n < report->maxfield; n++)
hid_input_field(hid, report->field[n], data, regs);
if (hid->claimed & HID_CLAIMED_INPUT)
hidinput_report_event(hid, report);
>From this, it seems that hiddev is notified of the report before the
fields of the report have been updated with new values. This isn't a
problem since hiddev cares only that the report changed, not what its
value is.
It feels counterintuitive, though, and some unsuspecting soul might
change hiddev such that it wants the value immediately. Is the current
behavior by design?
--Adam
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