Hi Jeff,
> Calculate a default based on the number of ABS axes, REL axes,
> and MT slots for the device during input device registration.
>
> Signed-off-by: jeffbrown@xxxxxxxxxxx
> ---
> drivers/input/input.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 46 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/input/input.c b/drivers/input/input.c
> index d6e8bd8..c27292b 100644
> --- a/drivers/input/input.c
> +++ b/drivers/input/input.c
> @@ -1746,6 +1746,49 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int
> }
> EXPORT_SYMBOL(input_set_capability);
>
> +static inline bool is_mt_axis(int axis)
> +{
> + return axis == ABS_MT_SLOT ||
> + (axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST);
> +}
It would be great to get this inline into input/mt.h instead.
> +static void input_set_default_events_per_packet(struct input_dev *dev)
> +{
> + int mt_slots;
> + int i;
> + int events;
> +
> + if (dev->hint_events_per_packet)
> + return;
> +
> + if (dev->mtsize)
> + mt_slots = dev->mtsize;
> + else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit))
> + mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
> + dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1;
This one is a bit iffy - the tracking id is not limited like this in
mainline, looks like android usage. A test againts some arbitrary max
should do it.
> + else if (test_bit(ABS_MT_POSITION_X, dev->absbit))
> + mt_slots = 2;
> + else
> + mt_slots = 0;
> +
> + events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
> +
> + for (i = 0; i < ABS_CNT; i++) {
> + if (test_bit(i, dev->absbit)) {
> + if (is_mt_axis(i))
> + events += mt_slots;
> + else
> + events++;
> + }
> + }
> +
> + for (i = 0; i < REL_CNT; i++)
> + if (test_bit(i, dev->relbit))
> + events++;
> +
> + input_set_events_per_packet(dev, events);
> +}
> +
> #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
> do { \
> if (!test_bit(EV_##type, dev->evbit)) \
> @@ -1784,6 +1827,9 @@ int input_register_device(struct input_dev *dev)
> const char *path;
> int error;
>
> + /* Use a larger default input buffer for MT devices */
> + input_set_default_events_per_packet(dev);
> +
> /* Every input device generates EV_SYN/SYN_REPORT events. */
> __set_bit(EV_SYN, dev->evbit);
>
> --
> 1.7.0.4
Thanks,
Henrik
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