diff options
Diffstat (limited to 'drivers/input/input-mt.c')
| -rw-r--r-- | drivers/input/input-mt.c | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c index d398f1321f14..fbe29fcb15c5 100644 --- a/drivers/input/input-mt.c +++ b/drivers/input/input-mt.c @@ -236,6 +236,35 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count) } EXPORT_SYMBOL(input_mt_report_pointer_emulation); +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); + } + } +} + +/** + * input_mt_drop_unused() - Inactivate slots not seen in this frame + * @dev: input device with allocated MT slots + * + * Lift all slots not seen since the last call to this function. + */ +void input_mt_drop_unused(struct input_dev *dev) +{ + struct input_mt *mt = dev->mt; + + if (mt) { + __input_mt_drop_unused(dev, mt); + mt->frame++; + } +} +EXPORT_SYMBOL(input_mt_drop_unused); + /** * input_mt_sync_frame() - synchronize mt frame * @dev: input device with allocated MT slots @@ -247,20 +276,13 @@ EXPORT_SYMBOL(input_mt_report_pointer_emulation); void input_mt_sync_frame(struct input_dev *dev) { struct input_mt *mt = dev->mt; - struct input_mt_slot *s; bool use_count = false; 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); - } - } + if (mt->flags & INPUT_MT_DROP_UNUSED) + __input_mt_drop_unused(dev, mt); if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT)) use_count = true; |