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| author | Benjamin Tissoires <benjamin.tissoires@enac.fr> | 2012-03-06 16:57:06 (GMT) |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-03-12 11:50:27 (GMT) |
| commit | 9e87f22ac6353b50425c5da412fe2418a48e25a3 (patch) | |
| tree | 57e1b4547e8b97357af7d6335b0fec485382e795 /drivers/hid/hid-multitouch.c | |
| parent | 8d179a9ef25a64b451e2bbd46f6a6c16c6a72eb1 (diff) | |
| download | linux-9e87f22ac6353b50425c5da412fe2418a48e25a3.tar.xz | |
HID: multitouch: detect serial protocol
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>
Diffstat (limited to 'drivers/hid/hid-multitouch.c')
| -rw-r--r-- | drivers/hid/hid-multitouch.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index a61ba42..6fb46d7 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -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) { |