The receiver of the G900 is similar to a Unifying one. However,
if we switch the receiver into the DJ mode through hid-logitech-dj,
the reports emitted by the mouse are from a new kind. Instead of finding
out what they are, and given that only one device should be connected
to the receiver, just use hid-logitech-hidpp.

The battery is not yet supported in the kernel, but at least the
input nodes are now named after the mouse.

Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
---
 drivers/hid/hid-ids.h            |  1 +
 drivers/hid/hid-logitech-hidpp.c | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index b366976e928c..f3de8562a92b 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -745,6 +745,7 @@
 #define USB_DEVICE_ID_LOGITECH_G700_RECEIVER           0xc531
 #define USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2     0xc532
 #define USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_2         0xc534
+#define USB_DEVICE_ID_LOGITECH_G900_RECEIVER           0xc539
 #define USB_DEVICE_ID_SPACETRAVELLER   0xc623
 #define USB_DEVICE_ID_SPACENAVIGATOR   0xc626
 #define USB_DEVICE_ID_DINOVO_DESKTOP   0xc704
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 0ab7f8b66b83..2e264869b096 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -68,6 +68,7 @@ MODULE_PARM_DESC(disable_tap_to_click,
 #define HIDPP_QUIRK_HI_RES_SCROLL_X2120                BIT(27)
 #define HIDPP_QUIRK_HI_RES_SCROLL_X2121                BIT(28)
 #define HIDPP_QUIRK_RECEIVER                   BIT(29)
+#define HIDPP_QUIRK_FORCE_OPEN                 BIT(30)
 
 /* Convenience constant to check for any high-res support. */
 #define HIDPP_QUIRK_HI_RES_SCROLL      (HIDPP_QUIRK_HI_RES_SCROLL_1P0 | \
@@ -3584,6 +3585,12 @@ static int hidpp_probe(struct hid_device *hdev, const 
struct hid_device_id *id)
                goto hid_hw_start_fail;
        }
 
+       if (hidpp->quirks & HIDPP_QUIRK_FORCE_OPEN) {
+               ret = hid_hw_open(hdev);
+               if (ret)
+                       goto hid_hw_open_fail;
+       }
+
        return ret;
 
 hid_hw_init_fail:
@@ -3608,6 +3615,9 @@ static void hidpp_remove(struct hid_device *hdev)
 
        sysfs_remove_group(&hdev->dev.kobj, &ps_attribute_group);
 
+       if (hidpp->quirks & HIDPP_QUIRK_FORCE_OPEN)
+               hid_hw_close(hdev);
+
        if (hidpp->quirks & HIDPP_QUIRK_CLASS_G920)
                hidpp_ff_deinit(hdev);
 
@@ -3674,6 +3684,11 @@ static const struct hid_device_id hidpp_devices[] = {
        { /* G700 over Wireless */
          HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, 
USB_DEVICE_ID_LOGITECH_G700_RECEIVER),
          .driver_data = HIDPP_QUIRK_RECEIVER | HIDPP_QUIRK_UNIFYING },
+       { /* G900 over Wireless */
+         HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+               USB_DEVICE_ID_LOGITECH_G900_RECEIVER),
+         .driver_data = HIDPP_QUIRK_RECEIVER | HIDPP_QUIRK_UNIFYING |
+                        HIDPP_QUIRK_FORCE_OPEN},
 
        { LDJ_DEVICE(HID_ANY_ID) },
 
-- 
2.14.3

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