[PATCH 2/2] HID: elecom: add support for EX-G M-XGL20DLBK wireless mouse

[YOSHIOKA Takuma]

Enables three buttons (Fn1, Fn2, and Fn3) on the ELECOM M-XGL20DLBK
wireless mouse.

While this mouse is EX-G brand, report descriptor is a bit different
from EX-G trackball mouse. To enable extra buttons, report should be
rewritten in a similar way to trackballs, but with different position
parameters.

Signed-off-by: YOSHIOKA Takuma <lo48...@hard-wi.red>
---
 drivers/hid/hid-elecom.c | 11 +++++++++++
 drivers/hid/hid-ids.h    |  1 +
 drivers/hid/hid-quirks.c |  1 +
 3 files changed, 13 insertions(+)

diff --git a/drivers/hid/hid-elecom.c b/drivers/hid/hid-elecom.c
index 233188100884..3bd7207de2e8 100644
--- a/drivers/hid/hid-elecom.c
+++ b/drivers/hid/hid-elecom.c
@@ -64,6 +64,16 @@ static __u8 *elecom_report_fixup(struct hid_device *hdev, 
__u8 *rdesc,
                        rdesc[47] = 0x00;
                }
                break;
+       case USB_DEVICE_ID_ELECOM_M_XGL20DLBK:
+               /*
+                * Report descriptor format:
+                * 20: button bit count
+                * 28: padding bit count
+                * 22: button report size
+                * 14: button usage maximum
+                */
+               mouse_button_fixup(hdev, rdesc, *rsize, 20, 28, 22, 14, 8);
+               break;
        case USB_DEVICE_ID_ELECOM_M_XT3URBK:
        case USB_DEVICE_ID_ELECOM_M_XT3DRBK:
        case USB_DEVICE_ID_ELECOM_M_XT4DRBK:
@@ -96,6 +106,7 @@ static __u8 *elecom_report_fixup(struct hid_device *hdev, 
__u8 *rdesc,
 
 static const struct hid_device_id elecom_devices[] = {
        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, 
USB_DEVICE_ID_ELECOM_BM084) },
+       { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, 
USB_DEVICE_ID_ELECOM_M_XGL20DLBK) },
        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3URBK) 
},
        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3DRBK) 
},
        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT4DRBK) 
},
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index d69842f79fc6..a29f4dacf640 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -388,6 +388,7 @@
 
 #define USB_VENDOR_ID_ELECOM           0x056e
 #define USB_DEVICE_ID_ELECOM_BM084     0x0061
+#define USB_DEVICE_ID_ELECOM_M_XGL20DLBK       0x00e6
 #define USB_DEVICE_ID_ELECOM_M_XT3URBK 0x00fb
 #define USB_DEVICE_ID_ELECOM_M_XT3DRBK 0x00fc
 #define USB_DEVICE_ID_ELECOM_M_XT4DRBK 0x00fd
diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
index 7a2be0205dfd..9355d92c6f14 100644
--- a/drivers/hid/hid-quirks.c
+++ b/drivers/hid/hid-quirks.c
@@ -361,6 +361,7 @@ static const struct hid_device_id hid_have_special_driver[] 
= {
 #endif
 #if IS_ENABLED(CONFIG_HID_ELECOM)
        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, 
USB_DEVICE_ID_ELECOM_BM084) },
+       { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, 
USB_DEVICE_ID_ELECOM_M_XGL20DLBK) },
        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3URBK) 
},
        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3DRBK) 
},
        { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT4DRBK) 
},
-- 
2.29.2