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authorBenjamin Tissoires <benjamin.tissoires@gmail.com>2012-11-14 16:59:18 +0100
committerJiri Kosina <jkosina@suse.cz>2012-11-15 10:08:56 +0100
commitafbcb04c181f36634f4af207bb0c9cc46b7405e4 (patch)
tree1d41dd184948bc2c940a9b38fdf62add230d2b1f /drivers/hid
parent54f4c0c3e9d9ad50bf58a4f7c2bbdfb3fa4ab3a7 (diff)
downloadop-kernel-dev-afbcb04c181f36634f4af207bb0c9cc46b7405e4.zip
op-kernel-dev-afbcb04c181f36634f4af207bb0c9cc46b7405e4.tar.gz
HID: multitouch: get maxcontacts also from logical_max value
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 <benjamin.tissoires@gmail.com> Acked-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-multitouch.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 3d2e6bb..9c7415f 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)
@@ -282,6 +283,9 @@ 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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