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Input: synaptics - fuzz position for touchpad with reduced filtering 

Synaptics touchpads indicate via a capability bit when they perform reduced
filtering on position data. In such a case, use a non-zero fuzz value.
Fuzz = 8 was chosen empirically by observing the raw position data
reported by a clickpad indicating it had reduced filtering.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Daniel Kurtz 2011-07-06 22:39:14 -07:00 committed by Dmitry Torokhov
parent 8be3c650f5
commit a9f0b79edf
2 changed files with 15 additions and 10 deletions
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15
drivers/input/mouse/synaptics.c
View File

@ -684,23 +684,25 @@ static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
{
int i;
int fuzz = SYN_CAP_REDUCED_FILTERING(priv->ext_cap_0c) ?
SYN_REDUCED_FILTER_FUZZ : 0;
__set_bit(INPUT_PROP_POINTER, dev->propbit);
__set_bit(EV_ABS, dev->evbit);
input_set_abs_params(dev, ABS_X,
XMIN_NOMINAL, priv->x_max ?: XMAX_NOMINAL, 0, 0);
input_set_abs_params(dev, ABS_Y,
YMIN_NOMINAL, priv->y_max ?: YMAX_NOMINAL, 0, 0);
input_set_abs_params(dev, ABS_X, XMIN_NOMINAL,
priv->x_max ?: XMAX_NOMINAL, fuzz, 0);
input_set_abs_params(dev, ABS_Y, YMIN_NOMINAL,
priv->y_max ?: YMAX_NOMINAL, fuzz, 0);
input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)) {
__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
input_mt_init_slots(dev, 2);
input_set_abs_params(dev, ABS_MT_POSITION_X, XMIN_NOMINAL,
priv->x_max ?: XMAX_NOMINAL, 0, 0);
priv->x_max ?: XMAX_NOMINAL, fuzz, 0);
input_set_abs_params(dev, ABS_MT_POSITION_Y, YMIN_NOMINAL,
priv->y_max ?: YMAX_NOMINAL, 0, 0);
priv->y_max ?: YMAX_NOMINAL, fuzz, 0);
input_abs_set_res(dev, ABS_MT_POSITION_X, priv->x_res);
input_abs_set_res(dev, ABS_MT_POSITION_Y, priv->y_res);
@ -974,4 +976,3 @@ bool synaptics_supported(void)
}
#endif /* CONFIG_MOUSE_PS2_SYNAPTICS */

10
drivers/input/mouse/synaptics.h
View File

@ -66,9 +66,9 @@
* 1 0x60 multifinger mode identifies firmware finger counting
* (not reporting!) algorithm.
* Not particularly meaningful
* 1 0x80 covered pad W clipped to 14, 15 == pad mostly covered
* 2 0x01 clickpad bit 1 2-button ClickPad
* 2 0x02 deluxe LED controls touchpad support LED commands
* 1 0x80 covered pad W clipped to 14, 15 == pad mostly covered
* 2 0x01 clickpad bit 1 2-button ClickPad
* 2 0x02 deluxe LED controls touchpad support LED commands
* ala multimedia control bar
* 2 0x04 reduced filtering firmware does less filtering on
* position data, driver should watch
@ -78,6 +78,7 @@
#define SYN_CAP_CLICKPAD2BTN(ex0c) ((ex0c) & 0x000100) /* 2-button ClickPad */
#define SYN_CAP_MAX_DIMENSIONS(ex0c) ((ex0c) & 0x020000)
#define SYN_CAP_ADV_GESTURE(ex0c) ((ex0c) & 0x080000)
#define SYN_CAP_REDUCED_FILTERING(ex0c) ((ex0c) & 0x000400)
/* synaptics modes query bits */
#define SYN_MODE_ABSOLUTE(m) ((m) & (1 << 7))
@ -104,6 +105,9 @@
#define SYN_NEWABS_RELAXED 2
#define SYN_OLDABS 3
/* amount to fuzz position data when touchpad reports reduced filtering */
#define SYN_REDUCED_FILTER_FUZZ 8
/*
* A structure to describe the state of the touchpad hardware (buttons and pad)
*/