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authorHenrik Rydberg <rydberg@euromail.se>2012-08-22 20:43:22 +0200
committerHenrik Rydberg <rydberg@euromail.se>2012-09-19 19:50:19 +0200
commit55e49089f4589908eb688742d2d7eff33b74ac78 (patch)
treeea080c5831e489465378a37480d87c1125143b8c /drivers/input/input-mt.c
parentb4adbbefc2099476a4f1020041c99f52cf3cd67d (diff)
downloadlinux-55e49089f4589908eb688742d2d7eff33b74ac78.tar.bz2
Input: MT - Handle frame synchronization in core
Most MT drivers perform the same actions on frame synchronization. Some actions, like dropping unseen contacts, are also unnecessarily complex. Collect common frame synchronization tasks in a new function, input_mt_sync_frame(). Depending on the flags set, it drops unseen contacts and performs pointer emulation. With init flags and frame synchronization in place, most MT drivers can be simplified. First out are the bcm5974 and hid-multitouch drivers, following this patch. Reviewed-and-tested-by: Benjamin Tissoires <benjamin.tissoires@enac.fr> Tested-by: Ping Cheng <pingc@wacom.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Diffstat (limited to 'drivers/input/input-mt.c')
-rw-r--r--drivers/input/input-mt.c70
1 files changed, 68 insertions, 2 deletions
diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index 1985f27f427a..96cc2e2a9be2 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
@@ -45,6 +53,28 @@ int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
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);
+ 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);
+
/* Mark slots as 'unused' */
for (i = 0; i < num_slots; i++)
input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);
@@ -87,12 +117,17 @@ void input_mt_report_slot_state(struct input_dev *dev,
struct input_mt_slot *slot;
int id;
- if (!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;
}
- slot = &mt->slots[mt->slot];
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);
@@ -177,3 +212,34 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
}
}
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);