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-rw-r--r--drivers/input/mouse/synaptics.c290
-rw-r--r--drivers/input/mouse/synaptics.h4
2 files changed, 278 insertions, 16 deletions
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index a7af8565e2de..aec9cf7124f8 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -453,6 +453,9 @@ static void synaptics_parse_agm(const unsigned char buf[],
default:
break;
}
+
+ /* Record that at least one AGM has been received since last SGM */
+ priv->agm_pending = true;
}
static int synaptics_parse_hw_state(const unsigned char buf[],
@@ -606,26 +609,53 @@ static void synaptics_report_slot(struct input_dev *dev, int slot,
}
static void synaptics_report_mt_data(struct psmouse *psmouse,
- int count,
+ struct synaptics_mt_state *mt_state,
const struct synaptics_hw_state *sgm)
{
struct input_dev *dev = psmouse->dev;
struct synaptics_data *priv = psmouse->private;
struct synaptics_hw_state *agm = &priv->agm;
+ struct synaptics_mt_state *old = &priv->mt_state;
- switch (count) {
+ switch (mt_state->count) {
case 0:
synaptics_report_slot(dev, 0, NULL);
synaptics_report_slot(dev, 1, NULL);
break;
case 1:
- synaptics_report_slot(dev, 0, sgm);
- synaptics_report_slot(dev, 1, NULL);
+ if (mt_state->sgm == -1) {
+ synaptics_report_slot(dev, 0, NULL);
+ synaptics_report_slot(dev, 1, NULL);
+ } else if (mt_state->sgm == 0) {
+ synaptics_report_slot(dev, 0, sgm);
+ synaptics_report_slot(dev, 1, NULL);
+ } else {
+ synaptics_report_slot(dev, 0, NULL);
+ synaptics_report_slot(dev, 1, sgm);
+ }
break;
- case 2:
- case 3: /* Fall-through case */
- synaptics_report_slot(dev, 0, sgm);
- synaptics_report_slot(dev, 1, agm);
+ default:
+ /*
+ * If the finger slot contained in SGM is valid, and either
+ * hasn't changed, or is new, then report SGM in MTB slot 0.
+ * Otherwise, empty MTB slot 0.
+ */
+ if (mt_state->sgm != -1 &&
+ (mt_state->sgm == old->sgm || old->sgm == -1))
+ synaptics_report_slot(dev, 0, sgm);
+ else
+ synaptics_report_slot(dev, 0, NULL);
+
+ /*
+ * If the finger slot contained in AGM is valid, and either
+ * hasn't changed, or is new, then report AGM in MTB slot 1.
+ * Otherwise, empty MTB slot 1.
+ */
+ if (mt_state->agm != -1 &&
+ (mt_state->agm == old->agm || old->agm == -1))
+ synaptics_report_slot(dev, 1, agm);
+ else
+ synaptics_report_slot(dev, 1, NULL);
break;
}
@@ -633,29 +663,257 @@ static void synaptics_report_mt_data(struct psmouse *psmouse,
input_mt_report_pointer_emulation(dev, false);
/* Send the number of fingers reported by touchpad itself. */
- input_mt_report_finger_count(dev, count);
+ input_mt_report_finger_count(dev, mt_state->count);
synaptics_report_buttons(psmouse, sgm);
input_sync(dev);
}
+/* Handle case where mt_state->count = 0 */
+static void synaptics_image_sensor_0f(struct synaptics_data *priv,
+ struct synaptics_mt_state *mt_state)
+{
+ synaptics_mt_state_set(mt_state, 0, -1, -1);
+ priv->mt_state_lost = false;
+}
+
+/* Handle case where mt_state->count = 1 */
+static void synaptics_image_sensor_1f(struct synaptics_data *priv,
+ struct synaptics_mt_state *mt_state)
+{
+ struct synaptics_hw_state *agm = &priv->agm;
+ struct synaptics_mt_state *old = &priv->mt_state;
+
+ /*
+ * If the last AGM was (0,0,0), and there is only one finger left,
+ * then we absolutely know that SGM contains slot 0, and all other
+ * fingers have been removed.
+ */
+ if (priv->agm_pending && agm->z == 0) {
+ synaptics_mt_state_set(mt_state, 1, 0, -1);
+ priv->mt_state_lost = false;
+ return;
+ }
+
+ switch (old->count) {
+ case 0:
+ synaptics_mt_state_set(mt_state, 1, 0, -1);
+ break;
+ case 1:
+ /*
+ * If mt_state_lost, then the previous transition was 3->1,
+ * and SGM now contains either slot 0 or 1, but we don't know
+ * which. So, we just assume that the SGM now contains slot 1.
+ *
+ * If pending AGM and either:
+ * (a) the previous SGM slot contains slot 0, or
+ * (b) there was no SGM slot
+ * then, the SGM now contains slot 1
+ *
+ * Case (a) happens with very rapid "drum roll" gestures, where
+ * slot 0 finger is lifted and a new slot 1 finger touches
+ * within one reporting interval.
+ *
+ * Case (b) happens if initially two or more fingers tap
+ * briefly, and all but one lift before the end of the first
+ * reporting interval.
+ *
+ * (In both these cases, slot 0 will becomes empty, so SGM
+ * contains slot 1 with the new finger)
+ *
+ * Else, if there was no previous SGM, it now contains slot 0.
+ *
+ * Otherwise, SGM still contains the same slot.
+ */
+ if (priv->mt_state_lost ||
+ (priv->agm_pending && old->sgm <= 0))
+ synaptics_mt_state_set(mt_state, 1, 1, -1);
+ else if (old->sgm == -1)
+ synaptics_mt_state_set(mt_state, 1, 0, -1);
+ break;
+ case 2:
+ /*
+ * If mt_state_lost, we don't know which finger SGM contains.
+ *
+ * So, report 1 finger, but with both slots empty.
+ * We will use slot 1 on subsequent 1->1
+ */
+ if (priv->mt_state_lost) {
+ synaptics_mt_state_set(mt_state, 1, -1, -1);
+ break;
+ }
+ /*
+ * Since the last AGM was NOT (0,0,0), it was the finger in
+ * slot 0 that has been removed.
+ * So, SGM now contains previous AGM's slot, and AGM is now
+ * empty.
+ */
+ synaptics_mt_state_set(mt_state, 1, old->agm, -1);
+ break;
+ case 3:
+ /*
+ * Since last AGM was not (0,0,0), we don't know which finger
+ * is left.
+ *
+ * So, report 1 finger, but with both slots empty.
+ * We will use slot 1 on subsequent 1->1
+ */
+ synaptics_mt_state_set(mt_state, 1, -1, -1);
+ priv->mt_state_lost = true;
+ break;
+ }
+}
+
+/* Handle case where mt_state->count = 2 */
+static void synaptics_image_sensor_2f(struct synaptics_data *priv,
+ struct synaptics_mt_state *mt_state)
+{
+ struct synaptics_mt_state *old = &priv->mt_state;
+
+ switch (old->count) {
+ case 0:
+ synaptics_mt_state_set(mt_state, 2, 0, 1);
+ break;
+ case 1:
+ /*
+ * If previous SGM contained slot 1 or higher, SGM now contains
+ * slot 0 (the newly touching finger) and AGM contains SGM's
+ * previous slot.
+ *
+ * Otherwise, SGM still contains slot 0 and AGM now contains
+ * slot 1.
+ */
+ if (old->sgm >= 1)
+ synaptics_mt_state_set(mt_state, 2, 0, old->sgm);
+ else
+ synaptics_mt_state_set(mt_state, 2, 0, 1);
+ break;
+ case 2:
+ /*
+ * If mt_state_lost, SGM now contains either finger 1 or 2, but
+ * we don't know which.
+ * So, we just assume that the SGM contains slot 0 and AGM 1.
+ */
+ if (priv->mt_state_lost)
+ synaptics_mt_state_set(mt_state, 2, 0, 1);
+ /*
+ * Otherwise, use the same mt_state, since it either hasn't
+ * changed, or was updated by a recently received AGM-CONTACT
+ * packet.
+ */
+ break;
+ case 3:
+ /*
+ * 3->2 transitions have two unsolvable problems:
+ * 1) no indication is given which finger was removed
+ * 2) no way to tell if agm packet was for finger 3
+ * before 3->2, or finger 2 after 3->2.
+ *
+ * So, report 2 fingers, but empty all slots.
+ * We will guess slots [0,1] on subsequent 2->2.
+ */
+ synaptics_mt_state_set(mt_state, 2, -1, -1);
+ priv->mt_state_lost = true;
+ break;
+ }
+}
+
+/* Handle case where mt_state->count = 3 */
+static void synaptics_image_sensor_3f(struct synaptics_data *priv,
+ struct synaptics_mt_state *mt_state)
+{
+ struct synaptics_mt_state *old = &priv->mt_state;
+
+ switch (old->count) {
+ case 0:
+ synaptics_mt_state_set(mt_state, 3, 0, 2);
+ break;
+ case 1:
+ /*
+ * If previous SGM contained slot 2 or higher, SGM now contains
+ * slot 0 (one of the newly touching fingers) and AGM contains
+ * SGM's previous slot.
+ *
+ * Otherwise, SGM now contains slot 0 and AGM contains slot 2.
+ */
+ if (old->sgm >= 2)
+ synaptics_mt_state_set(mt_state, 3, 0, old->sgm);
+ else
+ synaptics_mt_state_set(mt_state, 3, 0, 2);
+ break;
+ case 2:
+ /*
+ * After some 3->1 and all 3->2 transitions, we lose track
+ * of which slot is reported by SGM and AGM.
+ *
+ * For 2->3 in this state, report 3 fingers, but empty all
+ * slots, and we will guess (0,2) on a subsequent 0->3.
+ *
+ * To userspace, the resulting transition will look like:
+ * 2:[0,1] -> 3:[-1,-1] -> 3:[0,2]
+ */
+ if (priv->mt_state_lost) {
+ synaptics_mt_state_set(mt_state, 3, -1, -1);
+ break;
+ }
+
+ /*
+ * If the (SGM,AGM) really previously contained slots (0, 1),
+ * then we cannot know what slot was just reported by the AGM,
+ * because the 2->3 transition can occur either before or after
+ * the AGM packet. Thus, this most recent AGM could contain
+ * either the same old slot 1 or the new slot 2.
+ * Subsequent AGMs will be reporting slot 2.
+ *
+ * To userspace, the resulting transition will look like:
+ * 2:[0,1] -> 3:[0,-1] -> 3:[0,2]
+ */
+ synaptics_mt_state_set(mt_state, 3, 0, -1);
+ break;
+ case 3:
+ /*
+ * If, for whatever reason, the previous agm was invalid,
+ * Assume SGM now contains slot 0, AGM now contains slot 2.
+ */
+ if (old->agm <= 2)
+ synaptics_mt_state_set(mt_state, 3, 0, 2);
+ /*
+ * mt_state either hasn't changed, or was updated by a recently
+ * received AGM-CONTACT packet.
+ */
+ break;
+ }
+}
+
static void synaptics_image_sensor_process(struct psmouse *psmouse,
struct synaptics_hw_state *sgm)
{
- int count;
+ struct synaptics_data *priv = psmouse->private;
+ struct synaptics_hw_state *agm = &priv->agm;
+ struct synaptics_mt_state mt_state;
+ /* Initialize using current mt_state (as updated by last agm) */
+ mt_state = agm->mt_state;
+
+ /*
+ * Update mt_state using the new finger count and current mt_state.
+ */
if (sgm->z == 0)
- count = 0;
+ synaptics_image_sensor_0f(priv, &mt_state);
else if (sgm->w >= 4)
- count = 1;
+ synaptics_image_sensor_1f(priv, &mt_state);
else if (sgm->w == 0)
- count = 2;
- else
- count = 3;
+ synaptics_image_sensor_2f(priv, &mt_state);
+ else if (sgm->w == 1)
+ synaptics_image_sensor_3f(priv, &mt_state);
/* Send resulting input events to user space */
- synaptics_report_mt_data(psmouse, count, sgm);
+ synaptics_report_mt_data(psmouse, &mt_state, sgm);
+
+ /* Store updated mt_state */
+ priv->mt_state = agm->mt_state = mt_state;
+ priv->agm_pending = false;
}
/*
diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
index 20f57dfebed1..622aea8dd7e0 100644
--- a/drivers/input/mouse/synaptics.h
+++ b/drivers/input/mouse/synaptics.h
@@ -161,11 +161,15 @@ struct synaptics_data {
struct serio *pt_port; /* Pass-through serio port */
+ struct synaptics_mt_state mt_state; /* Current mt finger state */
+ bool mt_state_lost; /* mt_state may be incorrect */
+
/*
* Last received Advanced Gesture Mode (AGM) packet. An AGM packet
* contains position data for a second contact, at half resolution.
*/
struct synaptics_hw_state agm;
+ bool agm_pending; /* new AGM packet received */
};
void synaptics_module_init(void);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.