[PATCH v4 13/14] HID: hid-multitouch: fix Win 8 protocol
From: Benjamin Tissoires <hidden>
Date: 2012-11-14 16:00:45
Also in:
lkml
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
The Win 8 protocol specify the fact that each valid touch must be reported within a frame until it is released. We can therefore use the always_valid quirk and dismiss reports when we see duplicate contacts ID. We recognize Win8 certified devices from their vendor feature 0xff0000c5 where Microsoft put a signed blob in the report to check if the device passed the certification. Signed-off-by: Benjamin Tissoires <redacted> --- drivers/hid/hid-multitouch.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 5f26b2f..efae60c 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c@@ -295,6 +295,18 @@ static void mt_feature_mapping(struct hid_device *hdev, td->maxcontacts = td->mtclass.maxcontacts; break; + case 0xff0000c5: + if (field->report_count == 256 && field->report_size == 8) { + /* Win 8 devices need special quirks */ + __s32 *quirks = &td->mtclass.quirks; + *quirks |= MT_QUIRK_ALWAYS_VALID; + *quirks |= MT_QUIRK_IGNORE_DUPLICATES; + *quirks |= MT_QUIRK_HOVERING; + *quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP; + *quirks &= ~MT_QUIRK_VALID_IS_INRANGE; + *quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE; + } + break; } }
--
1.8.0