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SubjectRe: [PATCH 4/4] input: mt: Add pressure to pointer emulation code
On Mon, Nov 29, 2010 at 08:13:22AM +0100, Henrik Rydberg wrote:
> Some MT devices report pressure per contact. This patch adds
> ABS_PRESSURE to the pointer emulation code.
>
> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
> ---
> drivers/input/input-mt.c | 7 ++++++-
> 1 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
> index 08aa682..49ccd15 100644
> --- a/drivers/input/input-mt.c
> +++ b/drivers/input/input-mt.c
> @@ -97,7 +97,8 @@ EXPORT_SYMBOL(input_mt_report_slot_state);
> * input_mt_report_pointer_emulation() - common pointer emulation
> * @dev: input device with allocated MT slots
> *
> - * Performs legacy pointer emulation via BTN_TOUCH, ABS_X and ABS_Y.
> + * Performs legacy pointer emulation via BTN_TOUCH, ABS_X, ABS_Y and
> + * ABS_PRESSURE.
> */
> void input_mt_report_pointer_emulation(struct input_dev *dev)
> {
> @@ -124,9 +125,13 @@ void input_mt_report_pointer_emulation(struct input_dev *dev)
> if (oldest) {
> int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);
> int y = input_mt_get_value(oldest, ABS_MT_POSITION_Y);
> + int p = input_mt_get_value(oldest, ABS_MT_PRESSURE);

What if device does not report ABS_MT_PRESSURE/ABS_PRESSURE? Do we rely
on input core to suppress unsupported events? A comment would be nice...

Also, is there a gelper to set up pointer emulation capabilities for MT
device?

>
> input_event(dev, EV_ABS, ABS_X, x);
> input_event(dev, EV_ABS, ABS_Y, y);
> + input_event(dev, EV_ABS, ABS_PRESSURE, p);
> + } else {
> + input_event(dev, EV_ABS, ABS_PRESSURE, 0);
> }
> }
> EXPORT_SYMBOL(input_mt_report_pointer_emulation);
> --
> 1.7.1
>

--
Dmitry


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