HID: logitech-dj: add support for the new lightspeed receiver iteration

Tested with the G Pro X Superlight. libratbag sees the device, as
expected, and input events are passing trough.

libratbag/libratbag#1122

The receiver has a quirk where the moused interface doesn't have a
report ID, I am not sure why, perhaps they forgot. All other interfaces
have report IDs so I am left scratching my head.
Since this driver doesn't have a quirk system, I simply implemented it
as a different receiver type, which is true, it just wouldn't be the
prefered approach :P

Signed-off-by: Filipe Laíns <lains@riseup.net>

drivers/hid/hid-ids.h

@@ -870,6 +870,7 @@
 #define USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1	0xc539
 #define USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_1	0xc53f
 #define USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_POWERPLAY	0xc53a
+#define USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_2	0xc547
 #define USB_DEVICE_ID_SPACETRAVELLER	0xc623
 #define USB_DEVICE_ID_SPACENAVIGATOR	0xc626
 #define USB_DEVICE_ID_DINOVO_DESKTOP	0xc704

drivers/hid/hid-logitech-dj.c

@@ -116,6 +116,7 @@ enum recvr_type {
 	recvr_type_dj,
 	recvr_type_hidpp,
 	recvr_type_gaming_hidpp,
+	recvr_type_gaming_hidpp_missing_mse_report_id,  /* lightspeed receiver missing the mouse report ID */
 	recvr_type_mouse_only,
 	recvr_type_27mhz,
 	recvr_type_bluetooth,
@@ -1433,6 +1434,7 @@ static int logi_dj_ll_parse(struct hid_device *hid)
 		dbg_hid("%s: sending a mouse descriptor, reports_supported: %llx\n",
 			__func__, djdev->reports_supported);
 		if (djdev->dj_receiver_dev->type == recvr_type_gaming_hidpp ||
+		    djdev->dj_receiver_dev->type == recvr_type_gaming_hidpp_missing_mse_report_id ||
 		    djdev->dj_receiver_dev->type == recvr_type_mouse_only)
 			rdcat(rdesc, &rsize, mse_high_res_descriptor,
 			      sizeof(mse_high_res_descriptor));
@@ -1693,19 +1695,35 @@ static int logi_dj_raw_event(struct hid_device *hdev,
 			data[0] = data[1];
 			data[1] = 0;
 		}
-		/*
-		 * Mouse-only receivers send unnumbered mouse data. The 27 MHz
-		 * receiver uses 6 byte packets, the nano receiver 8 bytes.
-		 */
-		if (djrcv_dev->unnumbered_application == HID_GD_MOUSE &&
-		    size <= 8) {
-			u8 mouse_report[9];
-
-			/* Prepend report id */
-			mouse_report[0] = REPORT_TYPE_MOUSE;
-			memcpy(mouse_report + 1, data, size);
-			logi_dj_recv_forward_input_report(hdev, mouse_report,
-							  size + 1);
+
+		if (djrcv_dev->unnumbered_application == HID_GD_MOUSE) {
+			/*
+			 * Mouse-only receivers send unnumbered mouse data. The 27 MHz
+			 * receiver uses 6 byte packets, the nano receiver 8 bytes.
+			 * the lightspeed receiver (Pro X Superlight) 13 bytes.
+			 */
+			if (size <= 13) {
+				u8 mouse_report[14];
+
+				/* Prepend report id */
+				mouse_report[0] = REPORT_TYPE_MOUSE;
+				memcpy(mouse_report + 1, data, size);
+				logi_dj_recv_forward_input_report(hdev, mouse_report,
+								  size + 1);
+
+			/*
+			 * A variant of the ligtpseed receivers is missing the mouse
+			 * report ID.
+			 */
+			} else if (djrcv_dev->type == recvr_type_gaming_hidpp_missing_mse_report_id) {
+				u8 mouse_report[17];
+
+				/* Prepend report id */
+				mouse_report[0] = REPORT_TYPE_MOUSE;
+				memcpy(mouse_report + 1, data, size);
+				logi_dj_recv_forward_input_report(hdev, mouse_report,
+								  size + 1);
+			}
 		}
 
 		return false;
@@ -1776,6 +1794,7 @@ static int logi_dj_probe(struct hid_device *hdev,
 	case recvr_type_dj:		no_dj_interfaces = 3; break;
 	case recvr_type_hidpp:		no_dj_interfaces = 2; break;
 	case recvr_type_gaming_hidpp:	no_dj_interfaces = 3; break;
+	case recvr_type_gaming_hidpp_missing_mse_report_id: no_dj_interfaces = 3; break;
 	case recvr_type_mouse_only:	no_dj_interfaces = 2; break;
 	case recvr_type_27mhz:		no_dj_interfaces = 2; break;
 	case recvr_type_bluetooth:	no_dj_interfaces = 2; break;
@@ -1984,6 +2003,11 @@ static const struct hid_device_id logi_dj_receivers[] = {
 		USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_1),
 	 .driver_data = recvr_type_gaming_hidpp},
 
+	{ /* Logitech lightspeed receiver (0xc547) */
+	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_2),
+	 .driver_data = recvr_type_gaming_hidpp_missing_mse_report_id},
+
 	{ /* Logitech 27 MHz HID++ 1.0 receiver (0xc513) */
 	  HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER),
 	 .driver_data = recvr_type_27mhz},