[PATCH v2 05/11] HID: hid-multitouch: get maxcontacts also from logical_max value
From: Benjamin Tissoires <hidden>
Date: 2012-10-26 08:45:06
Also in:
lkml
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
Win8 devices are required to present the feature "Maximum Contact Number". Fortunately all win7 devices I've seen presents this feature. If the current value is 0, then, the driver can get the actual supported contact count by refering to the logical_max. This win8 specification ensures that logical_max may not be above 250. This also allows us to detect when devices like irtouch or stantum reports an obviously wrong value of 255. Signed-off-by: Benjamin Tissoires <redacted> --- drivers/hid/hid-multitouch.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 95562d8..41f2981 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c@@ -121,6 +121,7 @@ struct mt_device { #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS 0x0109 #define MT_DEFAULT_MAXCONTACT 10 +#define MT_MAX_MAXCONTACT 250 #define MT_USB_DEVICE(v, p) HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p) #define MT_BT_DEVICE(v, p) HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
@@ -283,6 +284,9 @@ static void mt_feature_mapping(struct hid_device *hdev, case HID_DG_CONTACTMAX: td->maxcontact_report_id = field->report->id; td->maxcontacts = field->value[0]; + if (!td->maxcontacts && + field->logical_maximum <= MT_MAX_MAXCONTACT) + td->maxcontacts = field->logical_maximum; if (td->mtclass.maxcontacts) /* check if the maxcontacts is given by the class */ td->maxcontacts = td->mtclass.maxcontacts;
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1.7.11.7