[PATCH 02/12] Input: synaptics - do not invert y if 0

djkurtz
2011-06-29T05:08:18Z

From: Daniel Kurtz <djkurtz@chromium.org>

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.

In some cases, however, y = 0 is sent by the touchpad.
In these cases, the kernel driver should not invert, and just report 0.

This patch also refactors the inversion into a macro, and moves it
into packet processing instead of during position reporting.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
---
drivers/input/mouse/synaptics.c | 16 +++++++++-------
1 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index e06e045..f6d0c04 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -44,6 +44,8 @@
#define YMIN_NOMINAL 1408
#define YMAX_NOMINAL 4448

+#define INVERT_Y(y) (((y) != 0) ? (YMAX_NOMINAL + YMIN_NOMINAL - (y)) : 0)
+

/*****************************************************************************
* Stuff we need even when we do not want native Synaptics support
@@ -409,9 +411,9 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
hw->x = (((buf[3] & 0x10) << 8) |
((buf[1] & 0x0f) << 8) |
buf[4]);
- hw->y = (((buf[3] & 0x20) << 7) |
+ hw->y = INVERT_Y((((buf[3] & 0x20) << 7) |
((buf[1] & 0xf0) << 4) |
- buf[5]);
+ buf[5]));

hw->z = buf[2];
hw->w = (((buf[0] & 0x30) >> 2) |
@@ -421,7 +423,8 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) && hw->w == 2) {
/* Gesture packet: (x, y, z) at half resolution */
priv->mt.x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
- priv->mt.y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
+ priv->mt.y = INVERT_Y((((buf[4] & 0xf0) << 4)
+ | buf[2]) << 1);
priv->mt.z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
return 1;
}
@@ -473,7 +476,7 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
}
} else {
hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
- hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
+ hw->y = INVERT_Y(((buf[4] & 0x1f) << 8) | buf[5]);

hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
@@ -491,8 +494,7 @@ static void set_slot(struct input_dev *dev, int slot, bool active, int x, int y)
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, y);
}
}

@@ -584,7 +586,7 @@ 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, hw.y);
}
input_report_abs(dev, ABS_PRESSURE, hw.z);

--
1.7.3.1