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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>
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1 changed files with 12 additions and 3 deletions
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@ -44,6 +44,16 @@
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#define YMIN_NOMINAL 1408
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#define YMAX_NOMINAL 4448
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/*
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* Synaptics touchpads report the y coordinate from bottom to top, which is
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* opposite from what userspace expects.
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* This function is used to invert y before reporting.
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*/
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static int synaptics_invert_y(int y)
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{
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return YMAX_NOMINAL + YMIN_NOMINAL - y;
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}
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/*****************************************************************************
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* Stuff we need even when we do not want native Synaptics support
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@ -502,8 +512,7 @@ static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
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input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
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if (active) {
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input_report_abs(dev, ABS_MT_POSITION_X, x);
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input_report_abs(dev, ABS_MT_POSITION_Y,
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YMAX_NOMINAL + YMIN_NOMINAL - y);
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input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
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}
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}
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@ -597,7 +606,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
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if (num_fingers > 0) {
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input_report_abs(dev, ABS_X, hw.x);
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input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
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input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
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}
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input_report_abs(dev, ABS_PRESSURE, hw.z);
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