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hid-multitouch: Filter collections by application usage.

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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
This commit is contained in:
Jeff Brown 2011-07-24 14:31:14 -07:00 • committed by John Stultz
parent 90037b2720
commit 0840b80cb9
1 changed files with 10 additions and 0 deletions
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10
drivers/hid/hid-multitouch.c
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@ -434,6 +434,16 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
td->buttons_count++;
/* 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;
if (usage->usage_index)
prev_usage = &field->usage[usage->usage_index - 1];