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Subject[PATCH v3] psmouse - focaltech pass finger width to userspace
Date
Focaltech touchpads report finger width in packet[5] of absolute packet.
Range for width in raw format is 0x10 - 0x70. Second half-byte is always 0.
0xff is reported, when a large contact area is detected.
This can be handled in userspace.

Signed-off-by: Dmitry Tunin <hanipouspilot@gmail.com>
---
drivers/input/mouse/focaltech.c | 53 +++++++++++++++++++++++++----------------
1 file changed, 32 insertions(+), 21 deletions(-)

diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c
index 23d2594..1ef9d2b 100644
--- a/drivers/input/mouse/focaltech.c
+++ b/drivers/input/mouse/focaltech.c
@@ -55,8 +55,6 @@ static void focaltech_reset(struct psmouse *psmouse)
psmouse_reset(psmouse);
}

-#ifdef CONFIG_MOUSE_PS2_FOCALTECH
-
/*
* Packet types - the numbers are not consecutive, so we might be missing
* something here.
@@ -105,6 +103,16 @@ struct focaltech_hw_state {

/* True if the clickpad has been pressed. */
bool pressed;
+
+ /*
+ * Finger width 0-7 and 15 for 'latching'
+ * 15 value stays until the finger is released
+ * Width is reported only when 1 finger is active
+ */
+ unsigned int width;
+
+ /* Finger count */
+ unsigned int count;
};

struct focaltech_data {
@@ -118,7 +126,7 @@ static void focaltech_report_state(struct psmouse *psmouse)
struct focaltech_hw_state *state = &priv->state;
struct input_dev *dev = psmouse->dev;
int i;
-
+
for (i = 0; i < FOC_MAX_FINGERS; i++) {
struct focaltech_finger_state *finger = &state->fingers[i];
bool active = finger->active && finger->valid;
@@ -126,21 +134,23 @@ static void focaltech_report_state(struct psmouse *psmouse)
input_mt_slot(dev, i);
input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
if (active) {
- unsigned int clamped_x, clamped_y;
+ int clamped_x, clamped_y;
/*
* The touchpad might report invalid data, so we clamp
* the resulting values so that we do not confuse
* userspace.
*/
- clamped_x = clamp(finger->x, 0U, priv->x_max);
- clamped_y = clamp(finger->y, 0U, priv->y_max);
+ clamped_x = clamp((int)finger->x, 0, (int)priv->x_max);
+ clamped_y = clamp((int)finger->y, 0, (int)priv->y_max);
input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
input_report_abs(dev, ABS_MT_POSITION_Y,
priv->y_max - clamped_y);
+ if (state->count == 1)
+ input_report_abs(dev, ABS_TOOL_WIDTH, state->width);
}
}
- input_mt_report_pointer_emulation(dev, true);
-
+ input_mt_report_finger_count(dev, state->count);
+ input_mt_report_pointer_emulation(dev, false);
input_report_key(psmouse->dev, BTN_LEFT, state->pressed);
input_sync(psmouse->dev);
}
@@ -152,13 +162,17 @@ static void focaltech_process_touch_packet(struct psmouse *psmouse,
struct focaltech_hw_state *state = &priv->state;
unsigned char fingers = packet[1];
int i;
+ int count = 0;

state->pressed = (packet[0] >> 4) & 1;

/* the second byte contains a bitmap of all fingers touching the pad */
for (i = 0; i < FOC_MAX_FINGERS; i++) {
- state->fingers[i].active = fingers & 0x1;
- if (!state->fingers[i].active) {
+
+ if (fingers & 0x1) {
+ state->fingers[i].active = true;
+ count++;
+ } else {
/*
* Even when the finger becomes active again, we still
* will have to wait for the first valid position.
@@ -167,6 +181,8 @@ static void focaltech_process_touch_packet(struct psmouse *psmouse,
}
fingers >>= 1;
}
+ state->width = packet[5] >> 4;
+ state->count = count;
}

static void focaltech_process_abs_packet(struct psmouse *psmouse,
@@ -187,6 +203,7 @@ static void focaltech_process_abs_packet(struct psmouse *psmouse,

state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
state->fingers[finger].y = (packet[3] << 8) | packet[4];
+ state->width = packet[5] >> 4;
state->fingers[finger].valid = true;
}

@@ -331,6 +348,7 @@ static void focaltech_set_input_params(struct psmouse *psmouse)
__set_bit(EV_ABS, dev->evbit);
input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
+ input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
}
@@ -428,9 +446,8 @@ int focaltech_init(struct psmouse *psmouse)
/* resync is not supported yet */
psmouse->resync_time = 0;
/*
- * rate/resolution/scale changes are not supported yet, and
- * the generic implementations of these functions seem to
- * confuse some touchpads
+ * rate/resolution/scale changes are not supported yet, and the generic
+ * implementations of these functions seem to confuse some touchpads
*/
psmouse->set_resolution = focaltech_set_resolution;
psmouse->set_rate = focaltech_set_rate;
@@ -444,13 +461,7 @@ fail:
return error;
}

-#else /* CONFIG_MOUSE_PS2_FOCALTECH */
-
-int focaltech_init(struct psmouse *psmouse)
+bool focaltech_supported(void)
{
- focaltech_reset(psmouse);
-
- return 0;
+ return true;
}
-
-#endif /* CONFIG_MOUSE_PS2_FOCALTECH */
--
1.9.1


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