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Input: synaptics - refactor y inversion 

Synaptics touchpads report increasing y from bottom to top.
This is inverted from normal userspace "top of screen is 0" coordinates.
Thus, the kernel driver reports inverted y coordinates to userspace.

This patch refactors this inversion.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Daniel Kurtz 2011-08-23 23:00:24 -07:00 committed by Dmitry Torokhov
parent 66fd9385ee
commit 6de58dd625
1 changed files with 12 additions and 3 deletions
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15
drivers/input/mouse/synaptics.c
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@ -44,6 +44,16 @@
#define YMIN_NOMINAL 1408
#define YMAX_NOMINAL 4448
/*
* Synaptics touchpads report the y coordinate from bottom to top, which is
* opposite from what userspace expects.
* This function is used to invert y before reporting.
*/
static int synaptics_invert_y(int y)
{
return YMAX_NOMINAL + YMIN_NOMINAL - y;
}
/*****************************************************************************
* Stuff we need even when we do not want native Synaptics support
@ -502,8 +512,7 @@ static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
if (active) {
input_report_abs(dev, ABS_MT_POSITION_X, x);
input_report_abs(dev, ABS_MT_POSITION_Y,
YMAX_NOMINAL + YMIN_NOMINAL - y);
input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
}
}
@ -597,7 +606,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
if (num_fingers > 0) {
input_report_abs(dev, ABS_X, hw.x);
input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
}
input_report_abs(dev, ABS_PRESSURE, hw.z);