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Input: synaptics - add support for ForcePads

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ForcePads are found on HP EliteBook 1040 laptops. They lack any kind of
physical buttons, instead they generate primary button click when user
presses somewhat hard on the surface of the touchpad. Unfortunately they
also report primary button click whenever there are 2 or more contacts
on the pad, messing up all multi-finger gestures (2-finger scrolling,
multi-finger tapping, etc). To cope with this behavior we introduce a
delay (currently 50 msecs) in reporting primary press in case more
contacts appear.

Cc: stable@vger.kernel.org
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2014-08-30 13:51:06 -07:00
parent 24e4d21c42
commit 5715fc764f
2 changed files with 63 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
drivers/input/mouse/synaptics.c
View File

@ -629,10 +629,61 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
((buf[0] & 0x04) >> 1) |
((buf[3] & 0x04) >> 2));
if ((SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) &&
hw->w == 2) {
synaptics_parse_agm(buf, priv, hw);
return 1;
}
hw->x = (((buf[3] & 0x10) << 8) |
((buf[1] & 0x0f) << 8) |
buf[4]);
hw->y = (((buf[3] & 0x20) << 7) |
((buf[1] & 0xf0) << 4) |
buf[5]);
hw->z = buf[2];
hw->left = (buf[0] & 0x01) ? 1 : 0;
hw->right = (buf[0] & 0x02) ? 1 : 0;
if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
if (SYN_CAP_FORCEPAD(priv->ext_cap_0c)) {
/*
* ForcePads, like Clickpads, use middle button
* bits to report primary button clicks.
* Unfortunately they report primary button not
* only when user presses on the pad above certain
* threshold, but also when there are more than one
* finger on the touchpad, which interferes with
* out multi-finger gestures.
*/
if (hw->z == 0) {
/* No contacts */
priv->press = priv->report_press = false;
} else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
/*
* Single-finger touch with pressure above
* the threshold. If pressure stays long
* enough, we'll start reporting primary
* button. We rely on the device continuing
* sending data even if finger does not
* move.
*/
if (!priv->press) {
priv->press_start = jiffies;
priv->press = true;
} else if (time_after(jiffies,
priv->press_start +
msecs_to_jiffies(50))) {
priv->report_press = true;
}
} else {
priv->press = false;
}
hw->left = priv->report_press;
} else if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
/*
* Clickpad's button is transmitted as middle button,
* however, since it is primary button, we will report
@ -651,21 +702,6 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
}
if ((SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) &&
hw->w == 2) {
synaptics_parse_agm(buf, priv, hw);
return 1;
}
hw->x = (((buf[3] & 0x10) << 8) |
((buf[1] & 0x0f) << 8) |
buf[4]);
hw->y = (((buf[3] & 0x20) << 7) |
((buf[1] & 0xf0) << 4) |
buf[5]);
hw->z = buf[2];
if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
((buf[0] ^ buf[3]) & 0x02)) {
switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {

11
drivers/input/mouse/synaptics.h
View File

@ -78,6 +78,11 @@
* 2 0x08 image sensor image sensor tracks 5 fingers, but only
* reports 2.
* 2 0x20 report min query 0x0f gives min coord reported
* 2 0x80 forcepad forcepad is a variant of clickpad that
* does not have physical buttons but rather
* uses pressure above certain threshold to
* report primary clicks. Forcepads also have
* clickpad bit set.
*/
#define SYN_CAP_CLICKPAD(ex0c) ((ex0c) & 0x100000) /* 1-button ClickPad */
#define SYN_CAP_CLICKPAD2BTN(ex0c) ((ex0c) & 0x000100) /* 2-button ClickPad */
@ -86,6 +91,7 @@
#define SYN_CAP_ADV_GESTURE(ex0c) ((ex0c) & 0x080000)
#define SYN_CAP_REDUCED_FILTERING(ex0c) ((ex0c) & 0x000400)
#define SYN_CAP_IMAGE_SENSOR(ex0c) ((ex0c) & 0x000800)
#define SYN_CAP_FORCEPAD(ex0c) ((ex0c) & 0x008000)
/* synaptics modes query bits */
#define SYN_MODE_ABSOLUTE(m) ((m) & (1 << 7))
@ -177,6 +183,11 @@ struct synaptics_data {
*/
struct synaptics_hw_state agm;
bool agm_pending; /* new AGM packet received */
/* ForcePad handling */
unsigned long press_start;
bool press;
bool report_press;
};
void synaptics_module_init(void);