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SubjectRe: [PATCH v3 09/13] HID: hid-multitouch: add MT_QUIRK_IGNORE_DUPLICATES
Hi Benjamin,

> this prevents a device to reuse contact id 0 several time when
> sending garbage values to complete the report.

This quirk allows a device to reuse a contact id when sending garbage
inactive contacts at the end of a report.

>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
> ---
> drivers/hid/hid-multitouch.c | 6 ++++++
> include/linux/input/mt.h | 6 ++++++
> 2 files changed, 12 insertions(+)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 2352770..351c814 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -52,6 +52,7 @@ MODULE_LICENSE("GPL");
> #define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 6)
> #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8)
> #define MT_QUIRK_NO_AREA (1 << 9)
> +#define MT_QUIRK_IGNORE_DUPLICATES (1 << 10)
>
> struct mt_slot {
> __s32 x, y, cx, cy, p, w, h;
> @@ -510,6 +511,11 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
> if (slotnum < 0 || slotnum >= td->maxcontacts)
> return;
>
> + if (td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES &&

Don't like parenthesis, i see :-)

> + input_mt_is_active(&input->mt->slots[slotnum]) &&
> + input_mt_is_used(input->mt, &input->mt->slots[slotnum]))
> + return;
> +

It init_mt_slots failed earlier (no checks), input->mt can be NULL
here. Also, a local variable instead of repetition would be nice.

> input_mt_slot(input, slotnum);
> input_mt_report_slot_state(input, MT_TOOL_FINGER,
> s->touch_state);
> diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h
> index cc5cca7..2e86bd0 100644
> --- a/include/linux/input/mt.h
> +++ b/include/linux/input/mt.h
> @@ -69,6 +69,12 @@ static inline bool input_mt_is_active(const struct input_mt_slot *slot)
> return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0;
> }
>
> +static inline bool input_mt_is_used(const struct input_mt *mt,
> + const struct input_mt_slot *slot)
> +{
> + return slot->frame == mt->frame;
> +}
> +

This is ok, although I would prefer to also change input-mt.c to use
this helper function. Possibly that turns this hunk into a separate patch.

> int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
> unsigned int flags);
> void input_mt_destroy_slots(struct input_dev *dev);
> --
> 1.7.11.7
>

Thanks,
Henrik


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