* [PATCH] Input: synaptics - reset the ABS_X/Y fuzz after initializing MT axes
@ 2018-01-16 5:34 Peter Hutterer
2018-01-16 23:41 ` Dmitry Torokhov
0 siblings, 1 reply; 2+ messages in thread
From: Peter Hutterer @ 2018-01-16 5:34 UTC (permalink / raw)
To: linux-input; +Cc: Benjamin Tissoires, Dmitry Torokhov, Andrew Duggan
input_mt_init_slots() resets the ABS_X/Y fuzz to 0 and expects the driver to
call input_mt_report_pointer_emulation(). That is based on the MT position
bits which are already defuzzed - hence a fuzz of 0.
In the case of synaptics semi-mt devices, we report the ABS_X/Y axes manually.
This results in the MT position being defuzzed but the single-touch emulation
missing that defuzzing.
Work around this by re-initializing the ABS_X/Y axes after the MT axis to
get the same fuzz value back.
https://bugs.freedesktop.org/show_bug.cgi?id=104533
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
Semi-mt devices are Dodos, so I'd rather go for the easy fix here than a
big rewrite of that code.
drivers/input/mouse/synaptics.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index ee5466a374bf..0e04275e0d74 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -1280,6 +1280,14 @@ static void set_input_params(struct psmouse *psmouse,
INPUT_MT_POINTER |
(cr48_profile_sensor ?
INPUT_MT_TRACK : INPUT_MT_SEMI_MT));
+
+ /* For semi-mt devices we send ABS_X/Y ourselves instead of
+ * input_mt_report_pointer_emulation. But
+ * input_mt_init_slots() resets the fuzz to 0, leading to a
+ * filtered ABS_MT_POSITION_X but an unfiltered ABS_X
+ * position. Let's re-initialize ABS_X/Y here. */
+ if (!cr48_profile_sensor)
+ set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
}
if (SYN_CAP_PALMDETECT(info->capabilities))
--
2.14.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Input: synaptics - reset the ABS_X/Y fuzz after initializing MT axes
2018-01-16 5:34 [PATCH] Input: synaptics - reset the ABS_X/Y fuzz after initializing MT axes Peter Hutterer
@ 2018-01-16 23:41 ` Dmitry Torokhov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Torokhov @ 2018-01-16 23:41 UTC (permalink / raw)
To: Peter Hutterer; +Cc: linux-input, Benjamin Tissoires, Andrew Duggan
On Tue, Jan 16, 2018 at 03:34:59PM +1000, Peter Hutterer wrote:
> input_mt_init_slots() resets the ABS_X/Y fuzz to 0 and expects the driver to
> call input_mt_report_pointer_emulation(). That is based on the MT position
> bits which are already defuzzed - hence a fuzz of 0.
>
> In the case of synaptics semi-mt devices, we report the ABS_X/Y axes manually.
> This results in the MT position being defuzzed but the single-touch emulation
> missing that defuzzing.
>
> Work around this by re-initializing the ABS_X/Y axes after the MT axis to
> get the same fuzz value back.
>
> https://bugs.freedesktop.org/show_bug.cgi?id=104533
>
> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Applied, thank you.
> ---
> Semi-mt devices are Dodos, so I'd rather go for the easy fix here than a
> big rewrite of that code.
>
> drivers/input/mouse/synaptics.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index ee5466a374bf..0e04275e0d74 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -1280,6 +1280,14 @@ static void set_input_params(struct psmouse *psmouse,
> INPUT_MT_POINTER |
> (cr48_profile_sensor ?
> INPUT_MT_TRACK : INPUT_MT_SEMI_MT));
> +
> + /* For semi-mt devices we send ABS_X/Y ourselves instead of
> + * input_mt_report_pointer_emulation. But
> + * input_mt_init_slots() resets the fuzz to 0, leading to a
> + * filtered ABS_MT_POSITION_X but an unfiltered ABS_X
> + * position. Let's re-initialize ABS_X/Y here. */
> + if (!cr48_profile_sensor)
> + set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
> }
>
> if (SYN_CAP_PALMDETECT(info->capabilities))
> --
> 2.14.3
>
--
Dmitry
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