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HID: multitouch: detect serial protocol

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Microsoft's documentation about multitouch protocols tells that
if a device presents one touch per report, then it should be treated
as a serial protocol.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2012-03-06 17:57:06 +01:00 committed by Jiri Kosina
parent 8d179a9ef2
commit 9e87f22ac6
1 changed files with 13 additions and 0 deletions
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13
drivers/hid/hid-multitouch.c
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@ -81,6 +81,9 @@ struct mt_device {
__u8 num_received; /* how many contacts we received */
__u8 num_expected; /* expected last contact index */
__u8 maxcontacts;
__u8 touches_by_report; /* how many touches are present in one report:
* 1 means we should use a serial protocol
* > 1 means hybrid (multitouch) protocol */
bool curvalid; /* is the current contact valid? */
struct mt_slot *slots;
};
@ -365,6 +368,7 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
input_mt_init_slots(hi->input, td->maxcontacts);
td->last_slot_field = usage->hid;
td->last_field_index = field->index;
td->touches_by_report++;
return 1;
case HID_DG_WIDTH:
hid_map_usage(hi, usage, bit, max,
@ -670,6 +674,15 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (ret)
goto fail;
if (!id && td->touches_by_report == 1) {
/* the device has been sent by hid-generic */
mtclass = &td->mtclass;
mtclass->quirks |= MT_QUIRK_ALWAYS_VALID;
mtclass->quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
mtclass->quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
mtclass->quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
}
td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
GFP_KERNEL);
if (!td->slots) {