Input: wacom - retrieve maximum number of touch points
From the HID usage table when it is supported.
Tested-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 98e9dd6..be13223 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -28,6 +28,7 @@
#define HID_USAGE_Y_TILT 0x3e
#define HID_USAGE_FINGER 0x22
#define HID_USAGE_STYLUS 0x20
+#define HID_USAGE_CONTACTMAX 0x55
#define HID_COLLECTION 0xa1
#define HID_COLLECTION_LOGICAL 0x02
#define HID_COLLECTION_END 0xc0
@@ -201,6 +202,27 @@
return length;
}
+static void wacom_retrieve_report_data(struct usb_interface *intf,
+ struct wacom_features *features)
+{
+ int result = 0;
+ unsigned char *rep_data;
+
+ rep_data = kmalloc(2, GFP_KERNEL);
+ if (rep_data) {
+
+ rep_data[0] = 12;
+ result = wacom_get_report(intf, WAC_HID_FEATURE_REPORT,
+ rep_data[0], &rep_data, 2,
+ WAC_MSG_RETRIES);
+
+ if (result >= 0 && rep_data[1] > 2)
+ features->touch_max = rep_data[1];
+
+ kfree(rep_data);
+ }
+}
+
/*
* Interface Descriptor of wacom devices can be incomplete and
* inconsistent so wacom_features table is used to store stylus
@@ -377,6 +399,11 @@
pen = 1;
i++;
break;
+
+ case HID_USAGE_CONTACTMAX:
+ wacom_retrieve_report_data(intf, features);
+ i++;
+ break;
}
break;
@@ -1085,7 +1112,7 @@
endpoint = &intf->cur_altsetting->endpoint[0].desc;
- /* Retrieve the physical and logical size for OEM devices */
+ /* Retrieve the physical and logical size for touch devices */
error = wacom_retrieve_hid_descriptor(intf, features);
if (error)
goto fail3;