Messages in this thread | | | From | "Henrik Rydberg" <> | Date | Wed, 20 Jun 2012 18:53:56 +0200 | Subject | Re: [PATCH 2/3] HID: hid-multitouch: support arrays for the split of the touches in a report |
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Hi Benjamin,
> Win8 certification introduced the ability to transmit two X and two Y per > touch. The specification precises that it must be in an array, with a > report count == 2. > > This test guarantees that we split the touches on the last element > in this array. > > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr> > --- > drivers/hid/hid-multitouch.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c > index 9a3891e..a5ef877 100644 > --- a/drivers/hid/hid-multitouch.c > +++ b/drivers/hid/hid-multitouch.c > @@ -601,7 +601,10 @@ static int mt_event(struct hid_device *hid, struct hid_field *field, > return 0; > } > > - if (usage->hid == td->last_slot_field) > + if (usage->hid == td->last_slot_field && > + usage == &field->usage[field->maxusage - 1]) > + /* we only take into account the last report > + * of a field if report_count > 1 */
This just looks so fragile... The report index should really be amount the arguments to mt_event(). Since we rely on the pointer to reveal the index, why not try something like (usage - &field->usage[0]) == (field->report_count - 1)? At least it shows clearly what we use the point for.
> mt_complete_slot(td); > > if (field->index == td->last_field_index > -- > 1.7.10.2 >
Thanks, Henrik
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