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path: root/drivers/input/input-mt.c
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Diffstat (limited to 'drivers/input/input-mt.c')
-rw-r--r--drivers/input/input-mt.c305
1 files changed, 277 insertions, 28 deletions
diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index 70a16c7..c0ec7d4 100644
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c
@@ -14,6 +14,14 @@
#define TRKID_SGN ((TRKID_MAX + 1) >> 1)
+static void copy_abs(struct input_dev *dev, unsigned int dst, unsigned int src)
+{
+ if (dev->absinfo && test_bit(src, dev->absbit)) {
+ dev->absinfo[dst] = dev->absinfo[src];
+ dev->absbit[BIT_WORD(dst)] |= BIT_MASK(dst);
+ }
+}
+
/**
* input_mt_init_slots() - initialize MT input slots
* @dev: input device supporting MT events and finger tracking
@@ -25,29 +33,63 @@
* May be called repeatedly. Returns -EINVAL if attempting to
* reinitialize with a different number of slots.
*/
-int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots)
+int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
+ unsigned int flags)
{
+ struct input_mt *mt = dev->mt;
int i;
if (!num_slots)
return 0;
- if (dev->mt)
- return dev->mtsize != num_slots ? -EINVAL : 0;
+ if (mt)
+ return mt->num_slots != num_slots ? -EINVAL : 0;
- dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL);
- if (!dev->mt)
- return -ENOMEM;
+ mt = kzalloc(sizeof(*mt) + num_slots * sizeof(*mt->slots), GFP_KERNEL);
+ if (!mt)
+ goto err_mem;
- dev->mtsize = num_slots;
+ mt->num_slots = num_slots;
+ mt->flags = flags;
input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
input_set_abs_params(dev, ABS_MT_TRACKING_ID, 0, TRKID_MAX, 0, 0);
- input_set_events_per_packet(dev, 6 * num_slots);
+
+ if (flags & (INPUT_MT_POINTER | INPUT_MT_DIRECT)) {
+ __set_bit(EV_KEY, dev->evbit);
+ __set_bit(BTN_TOUCH, dev->keybit);
+
+ copy_abs(dev, ABS_X, ABS_MT_POSITION_X);
+ copy_abs(dev, ABS_Y, ABS_MT_POSITION_Y);
+ copy_abs(dev, ABS_PRESSURE, ABS_MT_PRESSURE);
+ }
+ if (flags & INPUT_MT_POINTER) {
+ __set_bit(BTN_TOOL_FINGER, dev->keybit);
+ __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
+ if (num_slots >= 3)
+ __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
+ if (num_slots >= 4)
+ __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
+ if (num_slots >= 5)
+ __set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
+ __set_bit(INPUT_PROP_POINTER, dev->propbit);
+ }
+ if (flags & INPUT_MT_DIRECT)
+ __set_bit(INPUT_PROP_DIRECT, dev->propbit);
+ if (flags & INPUT_MT_TRACK) {
+ unsigned int n2 = num_slots * num_slots;
+ mt->red = kcalloc(n2, sizeof(*mt->red), GFP_KERNEL);
+ if (!mt->red)
+ goto err_mem;
+ }
/* Mark slots as 'unused' */
for (i = 0; i < num_slots; i++)
- input_mt_set_value(&dev->mt[i], ABS_MT_TRACKING_ID, -1);
+ input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);
+ dev->mt = mt;
return 0;
+err_mem:
+ kfree(mt);
+ return -ENOMEM;
}
EXPORT_SYMBOL(input_mt_init_slots);
@@ -60,11 +102,11 @@ EXPORT_SYMBOL(input_mt_init_slots);
*/
void input_mt_destroy_slots(struct input_dev *dev)
{
- kfree(dev->mt);
+ if (dev->mt) {
+ kfree(dev->mt->red);
+ kfree(dev->mt);
+ }
dev->mt = NULL;
- dev->mtsize = 0;
- dev->slot = 0;
- dev->trkid = 0;
}
EXPORT_SYMBOL(input_mt_destroy_slots);
@@ -83,18 +125,24 @@ EXPORT_SYMBOL(input_mt_destroy_slots);
void input_mt_report_slot_state(struct input_dev *dev,
unsigned int tool_type, bool active)
{
- struct input_mt_slot *mt;
+ struct input_mt *mt = dev->mt;
+ struct input_mt_slot *slot;
int id;
- if (!dev->mt || !active) {
+ if (!mt)
+ return;
+
+ slot = &mt->slots[mt->slot];
+ slot->frame = mt->frame;
+
+ if (!active) {
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
return;
}
- mt = &dev->mt[dev->slot];
- id = input_mt_get_value(mt, ABS_MT_TRACKING_ID);
- if (id < 0 || input_mt_get_value(mt, ABS_MT_TOOL_TYPE) != tool_type)
- id = input_mt_new_trkid(dev);
+ id = input_mt_get_value(slot, ABS_MT_TRACKING_ID);
+ if (id < 0 || input_mt_get_value(slot, ABS_MT_TOOL_TYPE) != tool_type)
+ id = input_mt_new_trkid(mt);
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, id);
input_event(dev, EV_ABS, ABS_MT_TOOL_TYPE, tool_type);
@@ -135,13 +183,19 @@ EXPORT_SYMBOL(input_mt_report_finger_count);
*/
void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
{
- struct input_mt_slot *oldest = NULL;
- int oldid = dev->trkid;
- int count = 0;
- int i;
+ struct input_mt *mt = dev->mt;
+ struct input_mt_slot *oldest;
+ int oldid, count, i;
+
+ if (!mt)
+ return;
+
+ oldest = 0;
+ oldid = mt->trkid;
+ count = 0;
- for (i = 0; i < dev->mtsize; ++i) {
- struct input_mt_slot *ps = &dev->mt[i];
+ for (i = 0; i < mt->num_slots; ++i) {
+ struct input_mt_slot *ps = &mt->slots[i];
int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
if (id < 0)
@@ -160,13 +214,208 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
if (oldest) {
int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);
int y = input_mt_get_value(oldest, ABS_MT_POSITION_Y);
- int p = input_mt_get_value(oldest, ABS_MT_PRESSURE);
input_event(dev, EV_ABS, ABS_X, x);
input_event(dev, EV_ABS, ABS_Y, y);
- input_event(dev, EV_ABS, ABS_PRESSURE, p);
+
+ if (test_bit(ABS_MT_PRESSURE, dev->absbit)) {
+ int p = input_mt_get_value(oldest, ABS_MT_PRESSURE);
+ input_event(dev, EV_ABS, ABS_PRESSURE, p);
+ }
} else {
- input_event(dev, EV_ABS, ABS_PRESSURE, 0);
+ if (test_bit(ABS_MT_PRESSURE, dev->absbit))
+ input_event(dev, EV_ABS, ABS_PRESSURE, 0);
}
}
EXPORT_SYMBOL(input_mt_report_pointer_emulation);
+
+/**
+ * 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 (s->frame == mt->frame)
+ 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++;
+}
+EXPORT_SYMBOL(input_mt_sync_frame);
+
+static int adjust_dual(int *begin, int step, int *end, int eq)
+{
+ int f, *p, s, c;
+
+ if (begin == end)
+ return 0;
+
+ f = *begin;
+ p = begin + step;
+ s = p == end ? f + 1 : *p;
+
+ for (; p != end; p += step)
+ if (*p < f)
+ s = f, f = *p;
+ else if (*p < s)
+ s = *p;
+
+ c = (f + s + 1) / 2;
+ if (c == 0 || (c > 0 && !eq))
+ return 0;
+ if (s < 0)
+ c *= 2;
+
+ for (p = begin; p != end; p += step)
+ *p -= c;
+
+ return (c < s && s <= 0) || (f >= 0 && f < c);
+}
+
+static void find_reduced_matrix(int *w, int nr, int nc, int nrc)
+{
+ int i, k, sum;
+
+ for (k = 0; k < nrc; k++) {
+ for (i = 0; i < nr; i++)
+ adjust_dual(w + i, nr, w + i + nrc, nr <= nc);
+ sum = 0;
+ for (i = 0; i < nrc; i += nr)
+ sum += adjust_dual(w + i, 1, w + i + nr, nc <= nr);
+ if (!sum)
+ break;
+ }
+}
+
+static int input_mt_set_matrix(struct input_mt *mt,
+ const struct input_mt_pos *pos, int num_pos)
+{
+ const struct input_mt_pos *p;
+ struct input_mt_slot *s;
+ int *w = mt->red;
+ int x, y;
+
+ for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
+ if (!input_mt_is_active(s))
+ continue;
+ x = input_mt_get_value(s, ABS_MT_POSITION_X);
+ y = input_mt_get_value(s, ABS_MT_POSITION_Y);
+ for (p = pos; p != pos + num_pos; p++) {
+ int dx = x - p->x, dy = y - p->y;
+ *w++ = dx * dx + dy * dy;
+ }
+ }
+
+ return w - mt->red;
+}
+
+static void input_mt_set_slots(struct input_mt *mt,
+ int *slots, int num_pos)
+{
+ struct input_mt_slot *s;
+ int *w = mt->red, *p;
+
+ for (p = slots; p != slots + num_pos; p++)
+ *p = -1;
+
+ for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
+ if (!input_mt_is_active(s))
+ continue;
+ for (p = slots; p != slots + num_pos; p++)
+ if (*w++ < 0)
+ *p = s - mt->slots;
+ }
+
+ for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
+ if (input_mt_is_active(s))
+ continue;
+ for (p = slots; p != slots + num_pos; p++)
+ if (*p < 0) {
+ *p = s - mt->slots;
+ break;
+ }
+ }
+}
+
+/**
+ * input_mt_assign_slots() - perform a best-match assignment
+ * @dev: input device with allocated MT slots
+ * @slots: the slot assignment to be filled
+ * @pos: the position array to match
+ * @num_pos: number of positions
+ *
+ * Performs a best match against the current contacts and returns
+ * the slot assignment list. New contacts are assigned to unused
+ * slots.
+ *
+ * Returns zero on success, or negative error in case of failure.
+ */
+int input_mt_assign_slots(struct input_dev *dev, int *slots,
+ const struct input_mt_pos *pos, int num_pos)
+{
+ struct input_mt *mt = dev->mt;
+ int nrc;
+
+ if (!mt || !mt->red)
+ return -ENXIO;
+ if (num_pos > mt->num_slots)
+ return -EINVAL;
+ if (num_pos < 1)
+ return 0;
+
+ nrc = input_mt_set_matrix(mt, pos, num_pos);
+ find_reduced_matrix(mt->red, num_pos, nrc / num_pos, nrc);
+ input_mt_set_slots(mt, slots, num_pos);
+
+ return 0;
+}
+EXPORT_SYMBOL(input_mt_assign_slots);
+
+/**
+ * input_mt_get_slot_by_key() - return slot matching key
+ * @dev: input device with allocated MT slots
+ * @key: the key of the sought slot
+ *
+ * Returns the slot of the given key, if it exists, otherwise
+ * set the key on the first unused slot and return.
+ *
+ * If no available slot can be found, -1 is returned.
+ */
+int input_mt_get_slot_by_key(struct input_dev *dev, int key)
+{
+ struct input_mt *mt = dev->mt;
+ struct input_mt_slot *s;
+
+ if (!mt)
+ return -1;
+
+ for (s = mt->slots; s != mt->slots + mt->num_slots; s++)
+ if (input_mt_is_active(s) && s->key == key)
+ return s - mt->slots;
+
+ for (s = mt->slots; s != mt->slots + mt->num_slots; s++)
+ if (!input_mt_is_active(s)) {
+ s->key = key;
+ return s - mt->slots;
+ }
+
+ return -1;
+}
+EXPORT_SYMBOL(input_mt_get_slot_by_key);