hid-multitouch: Filter collections by application usage.
This change fixes two problems.
First, it ensures that the hid-multitouch driver does not incorrectly
map GenericDesktop usages that are intended for other applications,
such as a Mouse.
Second, it sets the appropriate input properties so that user-space
can distinguish TouchScreen devices (INPUT_PROP_DIRECT) from
TouchPad devices (INPUT_PROP_POINTER) and configure them accordingly.
Change-Id: I8c2d947929186ffe7cf04b37c76e29b9abecf8cb
Signed-off-by: jeffbrown@android.com
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 1d5b941..2e6d187 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -319,6 +319,16 @@
if (field->physical == HID_DG_STYLUS)
return -1;
+ /* Only map fields from TouchScreen or TouchPad collections.
+ * We need to ignore fields that belong to other collections
+ * such as Mouse that might have the same GenericDesktop usages. */
+ if (field->application == HID_DG_TOUCHSCREEN)
+ set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
+ else if (field->application == HID_DG_TOUCHPAD)
+ set_bit(INPUT_PROP_POINTER, hi->input->propbit);
+ else
+ return 0;
+
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_GENDESK: