HID: Create a generic device group

Devices that do not have a special driver are handled by the generic
driver. This patch does the same thing using device groups; Instead of
forcing a particular driver, the appropriate driver is picked up by
udev. As a consequence, one can now move a device from generic to
specific handling by a simple rebind. By adding a new device id to the
generic driver, the same thing can be done in reverse.

Signed-off-by: Henrik Rydberg <[e-mail]>
Acked-by: Benjamin Tissoires <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-core.c

···
 		!strncmp(hdrv->name, "hid-multitouch", 14))
 		return 1;
 
-	if (!hid_match_device(hdev, hdrv))
-		return 0;
-
-	/* generic wants all that don't have specialized driver */
-	if (!strncmp(hdrv->name, "generic-", 8) && !hid_ignore_special_drivers)
-		return !hid_match_id(hdev, hid_have_special_driver);
-
-	return 1;
+	return hid_match_device(hdev, hdrv) != NULL;
 }
 
 static int hid_device_probe(struct device *dev)

drivers/hid/usbhid/hid-core.c

···
 };
 
 static const struct hid_device_id hid_usb_table[] = {
-	{ HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
+	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, HID_ANY_ID, HID_ANY_ID) },
 	{ }
 };
 

include/linux/hid.h

···
 	struct hid_class_descriptor desc[1];
 } __attribute__ ((packed));
 
-#define HID_DEVICE(b, ven, prod) \
-	.bus = (b), \
-	.vendor = (ven), .product = (prod)
-
-#define HID_USB_DEVICE(ven, prod)	HID_DEVICE(BUS_USB, ven, prod)
-#define HID_BLUETOOTH_DEVICE(ven, prod)	HID_DEVICE(BUS_BLUETOOTH, ven, prod)
+#define HID_DEVICE(b, g, ven, prod)					\
+	.bus = (b), .group = (g), .vendor = (ven), .product = (prod)
+#define HID_USB_DEVICE(ven, prod)				\
+	.bus = BUS_USB, .vendor = (ven), .product = (prod)
+#define HID_BLUETOOTH_DEVICE(ven, prod)					\
+	.bus = BUS_BLUETOOTH, .vendor = (ven), .product = (prod)
 
 #define HID_REPORT_ID(rep) \
 	.report_type = (rep)

net/bluetooth/hidp/core.c

···
 }
 
 static const struct hid_device_id hidp_table[] = {
-	{ HID_BLUETOOTH_DEVICE(HID_ANY_ID, HID_ANY_ID) },
+	{ HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_GENERIC, HID_ANY_ID, HID_ANY_ID) },
 	{ }
 };