static void __input_mt_drop_unused(struct input_dev *dev, struct input_mt *mt)
{
int i;
for (i = 0; i < mt->num_slots; i++) {
if (!input_mt_is_used(mt, &mt->slots[i])) {
input_mt_slot(dev, i);
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
}
}
}
/*
* this function is called when a whole contact has been processed,
* so that it can assign it to a slot and store the data there
*/
static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
{
if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
td->num_received >= td->num_expected)
return;
if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
int active;
int slotnum = mt_compute_slot(td, input);
struct mt_slot *s = &td->curdata;
struct input_mt *mt = input->mt;
if (slotnum < 0 || slotnum >= td->maxcontacts)
return;
if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
struct input_mt_slot *slot = &mt->slots[slotnum];
if (input_mt_is_active(slot) &&
input_mt_is_used(mt, slot))
return;
}
if (!(td->mtclass.quirks & MT_QUIRK_CONFIDENCE))
s->confidence_state = 1;
active = (s->touch_state || s->inrange_state) &&
s->confidence_state;
input_mt_slot(input, slotnum);
input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
if (active) {
/* this finger is in proximity of the sensor */
int wide = (s->w > s->h);
/* divided by two to match visual scale of touch */
int major = max(s->w, s->h) >> 1;
int minor = min(s->w, s->h) >> 1;
input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
input_event(input, EV_ABS, ABS_MT_DISTANCE,
!s->touch_state);
input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
}
}
/**
* input_mt_sync_frame() - synchronize mt frame
* @dev: input device with allocated MT slots
*
* Close the frame and prepare the internal state for a new one.
* Depending on the flags, marks unused slots as inactive and performs
* pointer emulation.
*/
void input_mt_sync_frame(struct input_dev *dev)
{
struct input_mt *mt = dev->mt;
struct input_mt_slot *s;
if (!mt)
return;
if (mt->flags & INPUT_MT_DROP_UNUSED) {
for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
if (input_mt_is_used(mt, s))
continue;
input_mt_slot(dev, s - mt->slots);
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
}
}
input_mt_report_pointer_emulation(dev, (mt->flags & INPUT_MT_POINTER));
mt->frame++;
}