HID: logitech-dj: Fix 064d:c52f receiver support

The c52f nano receiver is a mouse only receiver. This means that it needs
some special handling compared to the c534 nano receiver:

1) It sends unnumbered mouse reports with a size of 8 bytes, so we need
   to extend the unnumbered mouse report handling to support reports upto
   8 bytes large

2) It mouse reports have the same high-resolution format as those from the
   gaming mouse receivers

3) It can report consumer/multimedia buttons on its second interface, since
   this is a mouse-only receiver these must be forwarded to the mouse child
   device and not to the keyboard child-device (which will not exist)

Link: https://bugzilla.kernel.org/show_bug.cgi?id=203619
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

1 files changed, 27 insertions, 15 deletions

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index dfc34fe85319..ce00dc299404 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -128,6 +128,7 @@ enum recvr_type {
         recvr_type_dj,
         recvr_type_hidpp,
         recvr_type_gaming_hidpp,
+        recvr_type_mouse_only,
         recvr_type_27mhz,
         recvr_type_bluetooth,
 };
@@ -879,9 +880,12 @@ static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
         schedule_work(&djrcv_dev->work);
 }
 
-static void logi_hidpp_dev_conn_notif_equad(struct hidpp_event *hidpp_report,
+static void logi_hidpp_dev_conn_notif_equad(struct hid_device *hdev,
+                                            struct hidpp_event *hidpp_report,
                                             struct dj_workitem *workitem)
 {
+        struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
+
         workitem->type = WORKITEM_TYPE_PAIRED;
         workitem->device_type = hidpp_report->params[HIDPP_PARAM_DEVICE_INFO] &
                                 HIDPP_DEVICE_TYPE_MASK;
@@ -895,6 +899,8 @@ static void logi_hidpp_dev_conn_notif_equad(struct hidpp_event *hidpp_report,
                 break;
         case REPORT_TYPE_MOUSE:
                 workitem->reports_supported |= STD_MOUSE | HIDPP;
+                if (djrcv_dev->type == recvr_type_mouse_only)
+                        workitem->reports_supported |= MULTIMEDIA;
                 break;
         }
 }
@@ -938,7 +944,7 @@ static void logi_hidpp_recv_queue_notif(struct hid_device *hdev,
         case 0x01:
                 device_type = "Bluetooth";
                 /* Bluetooth connect packet contents is the same as (e)QUAD */
-                logi_hidpp_dev_conn_notif_equad(hidpp_report, &workitem);
+                logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
                 if (!(hidpp_report->params[HIDPP_PARAM_DEVICE_INFO] &
                                                 HIDPP_MANUFACTURER_MASK)) {
                         hid_info(hdev, "Non Logitech device connected on slot %d\n",
@@ -952,18 +958,18 @@ static void logi_hidpp_recv_queue_notif(struct hid_device *hdev,
                 break;
         case 0x03:
                 device_type = "QUAD or eQUAD";
-                logi_hidpp_dev_conn_notif_equad(hidpp_report, &workitem);
+                logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
                 break;
         case 0x04:
                 device_type = "eQUAD step 4 DJ";
-                logi_hidpp_dev_conn_notif_equad(hidpp_report, &workitem);
+                logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
                 break;
         case 0x05:
                 device_type = "DFU Lite";
                 break;
         case 0x06:
                 device_type = "eQUAD step 4 Lite";
-                logi_hidpp_dev_conn_notif_equad(hidpp_report, &workitem);
+                logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
                 break;
         case 0x07:
                 device_type = "eQUAD step 4 Gaming";
@@ -973,11 +979,11 @@ static void logi_hidpp_recv_queue_notif(struct hid_device *hdev,
                 break;
         case 0x0a:
                 device_type = "eQUAD nano Lite";
-                logi_hidpp_dev_conn_notif_equad(hidpp_report, &workitem);
+                logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
                 break;
         case 0x0c:
                 device_type = "eQUAD Lightspeed";
-                logi_hidpp_dev_conn_notif_equad(hidpp_report, &workitem);
+                logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem);
                 workitem.reports_supported |= STD_KEYBOARD;
                 break;
         }
@@ -1328,7 +1334,8 @@ static int logi_dj_ll_parse(struct hid_device *hid)
         if (djdev->reports_supported & STD_MOUSE) {
                 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)
+                if (djdev->dj_receiver_dev->type == recvr_type_gaming_hidpp ||
+                    djdev->dj_receiver_dev->type == recvr_type_mouse_only)
                         rdcat(rdesc, &rsize, mse_high_res_descriptor,
                               sizeof(mse_high_res_descriptor));
                 else if (djdev->dj_receiver_dev->type == recvr_type_27mhz)
@@ -1571,15 +1578,19 @@ 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 */
+                /*
+                 * 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 == 6) {
-                        u8 mouse_report[7];
+                    size <= 8) {
+                        u8 mouse_report[9];
 
                         /* 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);
+                        memcpy(mouse_report + 1, data, size);
+                        logi_dj_recv_forward_input_report(hdev, mouse_report,
+                                                          size + 1);
                 }
 
                 return false;
@@ -1650,6 +1661,7 @@ 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_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;
         }
@@ -1823,10 +1835,10 @@ static const struct hid_device_id logi_dj_receivers[] = {
         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2),
          .driver_data = recvr_type_dj},
-        { /* Logitech Nano (non DJ) receiver */
+        { /* Logitech Nano mouse only receiver */
           HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
                          USB_DEVICE_ID_LOGITECH_NANO_RECEIVER),
-         .driver_data = recvr_type_hidpp},
+         .driver_data = recvr_type_mouse_only},
         { /* Logitech Nano (non DJ) receiver */
           HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
                          USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_2),