HID: rmi: Scan the report descriptor to determine if the device is suitable for the hid-rmi driver
On composite HID devices there may be multiple HID devices on separate
interfaces, but hid-rmi should only bind to the touchpad. The previous version
simply checked that the interface protocol was set to mouse. Unfortuately, it
is not always the case that the touchpad has the mouse interface protocol set.
This patch takes a different approach and scans the report descriptor looking
for the Generic Desktop Pointer usage and the Vendor Specific Top Level
Collection needed by the hid-rmi driver to interface with the device.
Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index c3d0ac1..81665b4 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -698,6 +698,7 @@
static void hid_scan_collection(struct hid_parser *parser, unsigned type)
{
struct hid_device *hid = parser->device;
+ int i;
if (((parser->global.usage_page << 16) == HID_UP_SENSOR) &&
type == HID_COLLECTION_PHYSICAL)
@@ -707,6 +708,14 @@
hid->product == USB_DEVICE_ID_MS_TYPE_COVER_3 &&
hid->group == HID_GROUP_MULTITOUCH)
hid->group = HID_GROUP_GENERIC;
+
+ if ((parser->global.usage_page << 16) == HID_UP_GENDESK)
+ for (i = 0; i < parser->local.usage_index; i++)
+ if (parser->local.usage[i] == HID_GD_POINTER)
+ parser->scan_flags |= HID_SCAN_FLAG_GD_POINTER;
+
+ if ((parser->global.usage_page << 16) >= HID_UP_MSVENDOR)
+ parser->scan_flags |= HID_SCAN_FLAG_VENDOR_SPECIFIC;
}
static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
@@ -792,11 +801,14 @@
hid->group = HID_GROUP_WACOM;
break;
case USB_VENDOR_ID_SYNAPTICS:
- if ((hid->group == HID_GROUP_GENERIC) &&
- (hid->bus != BUS_USB || hid->type == HID_TYPE_USBMOUSE))
- /* hid-rmi should only bind to the mouse interface of
- * composite USB devices */
- hid->group = HID_GROUP_RMI;
+ if (hid->group == HID_GROUP_GENERIC)
+ if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC)
+ && (parser->scan_flags & HID_SCAN_FLAG_GD_POINTER))
+ /*
+ * hid-rmi should take care of them,
+ * not hid-generic
+ */
+ hid->group = HID_GROUP_RMI;
break;
}
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 06c4607..efc7787 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -574,7 +574,9 @@
#define HID_GLOBAL_STACK_SIZE 4
#define HID_COLLECTION_STACK_SIZE 4
-#define HID_SCAN_FLAG_MT_WIN_8 0x00000001
+#define HID_SCAN_FLAG_MT_WIN_8 BIT(0)
+#define HID_SCAN_FLAG_VENDOR_SPECIFIC BIT(1)
+#define HID_SCAN_FLAG_GD_POINTER BIT(2)
struct hid_parser {
struct hid_global global;