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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 3d2e6bbb0046..9c7415ff4aaf 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;