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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-07-29 22:34:47 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-07-29 22:34:47 -0700 |
| commit | cf45b5a2525d9e7473db955750a8db9d4160b6ab (patch) | |
| tree | fa0d5db50adfbf4906313567c9f8f72984fadb0e /drivers/input/mouse | |
| parent | 314820c9e892d8f41ba4db300ec96770d9c8294b (diff) | |
| parent | c0394506e69b37c47d391c2a7bbea3ea236d8ec8 (diff) | |
Merge branch 'next' into for-linus
Prepare second set of changes for 3.6 merge window.
Diffstat (limited to 'drivers/input/mouse')
| -rw-r--r-- | drivers/input/mouse/synaptics.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index d5b390f75c9a..14eaecea2b70 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -40,11 +40,27 @@ * Note that newer firmware allows querying device for maximum useable * coordinates. */ +#define XMIN 0 +#define XMAX 6143 +#define YMIN 0 +#define YMAX 6143 #define XMIN_NOMINAL 1472 #define XMAX_NOMINAL 5472 #define YMIN_NOMINAL 1408 #define YMAX_NOMINAL 4448 +/* Size in bits of absolute position values reported by the hardware */ +#define ABS_POS_BITS 13 + +/* + * Any position values from the hardware above the following limits are + * treated as "wrapped around negative" values that have been truncated to + * the 13-bit reporting range of the hardware. These are just reasonable + * guesses and can be adjusted if hardware is found that operates outside + * of these parameters. + */ +#define X_MAX_POSITIVE (((1 << ABS_POS_BITS) + XMAX) / 2) +#define Y_MAX_POSITIVE (((1 << ABS_POS_BITS) + YMAX) / 2) /***************************************************************************** * Stuff we need even when we do not want native Synaptics support @@ -588,6 +604,12 @@ static int synaptics_parse_hw_state(const unsigned char buf[], hw->right = (buf[0] & 0x02) ? 1 : 0; } + /* Convert wrap-around values to negative */ + if (hw->x > X_MAX_POSITIVE) + hw->x -= 1 << ABS_POS_BITS; + if (hw->y > Y_MAX_POSITIVE) + hw->y -= 1 << ABS_POS_BITS; + return 0; } |