HID: logitech-dj: add support for 27 MHz mouse-only receivers

27 MHz mouse-only receivers send an unnumbered input report with the mouse
data, add special handling for this and add the c51b product-id to the
logi_dj_receivers table.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 3004ca91b76b..08662b97b2cb 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -1483,6 +1483,16 @@ static int logi_dj_raw_event(struct hid_device *hdev,
                         data[0] = data[1];
                         data[1] = 0;
                 }
+                /* The 27 MHz mouse-only receiver sends unnumbered mouse data */
+                if (djrcv_dev->unnumbered_application == HID_GD_MOUSE &&
+                    size == 6) {
+                        u8 mouse_report[7];
+
+                        /* Prepend report id */
+                        mouse_report[0] = REPORT_TYPE_MOUSE;
+                        memcpy(mouse_report + 1, data, 6);
+                        logi_dj_recv_forward_input_report(hdev, mouse_report, 7);
+                }
 
                 return false;
         }
@@ -1720,6 +1730,10 @@ static const struct hid_device_id logi_dj_receivers[] = {
           HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
                 USB_DEVICE_ID_S510_RECEIVER_2),
          .driver_data = recvr_type_27mhz},
+        { /* Logitech 27 MHz HID++ 1.0 mouse-only receiver (0xc51b) */
+          HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+                USB_DEVICE_ID_LOGITECH_27MHZ_MOUSE_RECEIVER),
+         .driver_data = recvr_type_27mhz},
         {}
 };