4 files changed, 61 insertions, 11 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index fe40e5e499dd..687705c50794 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -275,10 +275,12 @@ config HID_EMS_FF
          - Trio Linker Plus II
 
 config HID_ELECOM
-        tristate "ELECOM BM084 bluetooth mouse"
+        tristate "ELECOM HID devices"
         depends on HID
         ---help---
-        Support for the ELECOM BM084 (bluetooth mouse).
+        Support for ELECOM devices:
+          - BM084 Bluetooth Mouse
+          - DEFT Trackball (Wired and wireless)
 
 config HID_ELO
         tristate "ELO USB 4000/4500 touchscreen"
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 37084b645785..38d041510e1d 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1891,6 +1891,8 @@ static const struct hid_device_id hid_have_special_driver[] = {
         { HID_USB_DEVICE(USB_VENDOR_ID_DREAM_CHEEKY, USB_DEVICE_ID_DREAM_CHEEKY_WN) },
         { HID_USB_DEVICE(USB_VENDOR_ID_DREAM_CHEEKY, USB_DEVICE_ID_DREAM_CHEEKY_FA) },
         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) },
         { HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0009) },
         { HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0030) },
         { HID_USB_DEVICE(USB_VENDOR_ID_ELO, USB_DEVICE_ID_ELO_ACCUTOUCH_2216) },
diff --git a/drivers/hid/hid-elecom.c b/drivers/hid/hid-elecom.c
index 6e3848a8d8dd..e2c7465df69f 100644
--- a/drivers/hid/hid-elecom.c
+++ b/drivers/hid/hid-elecom.c
@@ -1,10 +1,8 @@
 /*
- *  HID driver for Elecom BM084 (bluetooth mouse).
- *  Removes a non-existing horizontal wheel from
- *  the HID descriptor.
- *  (This module is based on "hid-ortek".)
- *
+ *  HID driver for ELECOM devices.
  *  Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com>
+ *  Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com>
+ *  Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu>
  */
 
 /*
@@ -23,15 +21,61 @@
 static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                 unsigned int *rsize)
 {
-        if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) {
-                hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n");
-                rdesc[47] = 0x00;
+        switch (hdev->product) {
+        case USB_DEVICE_ID_ELECOM_BM084:
+                /* The BM084 Bluetooth mouse includes a non-existing horizontal
+                 * wheel in the HID descriptor. */
+                if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) {
+                        hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n");
+                        rdesc[47] = 0x00;
+                }
+                break;
+        case USB_DEVICE_ID_ELECOM_DEFT_WIRED:
+        case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS:
+                /* The DEFT trackball has eight buttons, but its descriptor only
+                 * reports five, disabling the three Fn buttons on the top of
+                 * the mouse.
+                 *
+                 * Apply the following diff to the descriptor:
+                 *
+                 * Collection (Physical),              Collection (Physical),
+                 *     Report ID (1),                      Report ID (1),
+                 *     Report Count (5),           ->      Report Count (8),
+                 *     Report Size (1),                    Report Size (1),
+                 *     Usage Page (Button),                Usage Page (Button),
+                 *     Usage Minimum (01h),                Usage Minimum (01h),
+                 *     Usage Maximum (05h),        ->      Usage Maximum (08h),
+                 *     Logical Minimum (0),                Logical Minimum (0),
+                 *     Logical Maximum (1),                Logical Maximum (1),
+                 *     Input (Variable),                   Input (Variable),
+                 *     Report Count (1),           ->      Report Count (0),
+                 *     Report Size (3),                    Report Size (3),
+                 *     Input (Constant),                   Input (Constant),
+                 *     Report Size (16),                   Report Size (16),
+                 *     Report Count (2),                   Report Count (2),
+                 *     Usage Page (Desktop),               Usage Page (Desktop),
+                 *     Usage (X),                          Usage (X),
+                 *     Usage (Y),                          Usage (Y),
+                 *     Logical Minimum (-32768),           Logical Minimum (-32768),
+                 *     Logical Maximum (32767),            Logical Maximum (32767),
+                 *     Input (Variable, Relative),         Input (Variable, Relative),
+                 * End Collection,                     End Collection,
+                 */
+                if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) {
+                        hid_info(hdev, "Fixing up Elecom DEFT Fn buttons\n");
+                        rdesc[13] = 8; /* Button/Variable Report Count */
+                        rdesc[21] = 8; /* Button/Variable Usage Maximum */
+                        rdesc[29] = 0; /* Button/Constant Report Count */
+                }
+                break;
         }
         return rdesc;
 }
 
 static const struct hid_device_id elecom_devices[] = {
-        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084)},
+        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) },
         { }
 };
 MODULE_DEVICE_TABLE(hid, elecom_devices);
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 643390ba749d..8e8a1baee090 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -358,6 +358,8 @@
 
 #define USB_VENDOR_ID_ELECOM            0x056e
 #define USB_DEVICE_ID_ELECOM_BM084      0x0061
+#define USB_DEVICE_ID_ELECOM_DEFT_WIRED 0x00fe
+#define USB_DEVICE_ID_ELECOM_DEFT_WIRELESS      0x00ff
 
 #define USB_VENDOR_ID_DREAM_CHEEKY      0x1d34
 #define USB_DEVICE_ID_DREAM_CHEEKY_WN   0x0004