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authorJeff Brown <jeffbrown@android.com>2011-08-16 03:44:28 +0400
committerJiri Kosina <jkosina@suse.cz>2011-08-16 13:38:44 +0400
commit658d4aed59b36f877edc668cc27b188a33e643e5 (patch)
tree2ee21fb03c13e94df7c685441748135b5b980b21 /drivers/hid/hid-multitouch.c
parentf5fc87905ea075a0b14878086fd4fe38be128844 (diff)
downloadlinux-658d4aed59b36f877edc668cc27b188a33e643e5.tar.xz
HID: 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. Signed-off-by: jeffbrown@android.com Acked-By: Benjamin Tissoires <Benjamin_Tissoires@logitech.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-multitouch.c')
-rw-r--r--drivers/hid/hid-multitouch.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 58d0e7aaf088..4ee21ac8e856 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -213,6 +213,16 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct mt_class *cls = td->mtclass;
__s32 quirks = cls->quirks;
+ /* 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: