HID: multitouch: Add support for button type usage
According to [1], Windows Precision Touchpad devices must supply
a button type usage in the device capabilities feature report. A
value of 0 indicates that the device contains a depressible
button (i.e. it's a click-pad) whereas a value of 1 indicates
a non-depressible button. Add support for this usage and set
INPUT_PROP_BUTTONPAD on the touchpad input device whenever a
depressible button is present.
[1] https://msdn.microsoft.com/en-us/library/windows/hardware/dn467314(v=vs.85).aspx
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index ef06dc3..55e89b1 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -72,6 +72,8 @@
#define MT_INPUTMODE_TOUCHSCREEN 0x02
#define MT_INPUTMODE_TOUCHPAD 0x03
+#define MT_BUTTONTYPE_CLICKPAD 0
+
struct mt_slot {
__s32 x, y, cx, cy, p, w, h;
__s32 contactid; /* the device ContactID assigned to this slot */
@@ -117,6 +119,7 @@
* 1 means we should use a serial protocol
* > 1 means hybrid (multitouch) protocol */
__u8 buttons_count; /* number of physical buttons per touchpad */
+ bool is_buttonpad; /* is this device a button pad? */
bool serial_maybe; /* need to check for serial protocol */
bool curvalid; /* is the current contact valid? */
unsigned mt_flags; /* flags to pass to input-mt */
@@ -335,6 +338,16 @@
td->maxcontacts = td->mtclass.maxcontacts;
break;
+ case HID_DG_BUTTONTYPE:
+ if (usage->usage_index >= field->report_count) {
+ dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
+ break;
+ }
+
+ if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
+ td->is_buttonpad = true;
+
+ break;
}
}
@@ -735,6 +748,9 @@
/* check for clickpads */
if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
+ td->is_buttonpad = true;
+
+ if (td->is_buttonpad)
__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
input_mt_init_slots(input, td->maxcontacts, td->mt_flags);