| /* |
| * HID driver for ELECOM devices: |
| * - BM084 Bluetooth Mouse |
| * - EX-G Trackballs (M-XT3DRBK, M-XT3URBK, M-XT4DRBK) |
| * - DEFT Trackballs (M-DT1DRBK, M-DT1URBK, M-DT2DRBK, M-DT2URBK) |
| * - HUGE Trackballs (M-HT1DRBK, M-HT1URBK) |
| * |
| * 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> |
| * Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org> |
| * Copyright (c) 2017 Tomasz Kramkowski <tk@the-tk.com> |
| */ |
| |
| /* |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/hid.h> |
| #include <linux/module.h> |
| |
| #include "hid-ids.h" |
| |
| /* |
| * Certain ELECOM mice misreport their button count meaning that they only work |
| * correctly with the ELECOM mouse assistant software which is unavailable for |
| * Linux. A four extra INPUT reports and a FEATURE report are described by the |
| * report descriptor but it does not appear that these enable software to |
| * control what the extra buttons map to. The only simple and straightforward |
| * solution seems to involve fixing up the report descriptor. |
| * |
| * Report descriptor format: |
| * Positions 13, 15, 21 and 31 store the button bit count, button usage minimum, |
| * button usage maximum and padding bit count respectively. |
| */ |
| #define MOUSE_BUTTONS_MAX 8 |
| static void mouse_button_fixup(struct hid_device *hdev, |
| __u8 *rdesc, unsigned int rsize, |
| int nbuttons) |
| { |
| if (rsize < 32 || rdesc[12] != 0x95 || |
| rdesc[14] != 0x75 || rdesc[15] != 0x01 || |
| rdesc[20] != 0x29 || rdesc[30] != 0x75) |
| return; |
| hid_info(hdev, "Fixing up Elecom mouse button count\n"); |
| nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX); |
| rdesc[13] = nbuttons; |
| rdesc[21] = nbuttons; |
| rdesc[31] = MOUSE_BUTTONS_MAX - nbuttons; |
| } |
| |
| static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
| unsigned int *rsize) |
| { |
| 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_M_XT3URBK: |
| case USB_DEVICE_ID_ELECOM_M_XT3DRBK: |
| case USB_DEVICE_ID_ELECOM_M_XT4DRBK: |
| mouse_button_fixup(hdev, rdesc, *rsize, 6); |
| break; |
| case USB_DEVICE_ID_ELECOM_M_DT1URBK: |
| case USB_DEVICE_ID_ELECOM_M_DT1DRBK: |
| case USB_DEVICE_ID_ELECOM_M_HT1URBK: |
| case USB_DEVICE_ID_ELECOM_M_HT1DRBK: |
| mouse_button_fixup(hdev, rdesc, *rsize, 8); |
| break; |
| } |
| return 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_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) }, |
| { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1URBK) }, |
| { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1DRBK) }, |
| { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1URBK) }, |
| { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1DRBK) }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(hid, elecom_devices); |
| |
| static struct hid_driver elecom_driver = { |
| .name = "elecom", |
| .id_table = elecom_devices, |
| .report_fixup = elecom_report_fixup |
| }; |
| module_hid_driver(elecom_driver); |
| |
| MODULE_LICENSE("GPL"); |