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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
* Copyright (c) 2020 YOSHIOKA Takuma <lo48576@hard-wi.red>
* Copyright (c) 2022 Takahiro Fujii <fujii@xaxxi.net>
*/
/*
*/
#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.
*/
#define MOUSE_BUTTONS_MAX 8
static void mouse_button_fixup(struct hid_device *hdev,
__u8 *rdesc, unsigned int rsize,
unsigned int button_bit_count,
unsigned int padding_bit,
unsigned int button_report_size,
unsigned int button_usage_maximum,
int nbuttons)
{
if (rsize < 32 || rdesc[button_bit_count] != 0x95 ||
rdesc[button_report_size] != 0x75 ||
rdesc[button_report_size + 1] != 0x01 ||
rdesc[button_usage_maximum] != 0x29 || rdesc[padding_bit] != 0x75)
return;
hid_info(hdev, "Fixing up Elecom mouse button count\n");
nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX);
rdesc[button_bit_count + 1] = nbuttons;
rdesc[button_usage_maximum + 1] = nbuttons;
rdesc[padding_bit + 1] = 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_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:
/*
* Report descriptor format:
* 12: button bit count
* 30: padding bit count
* 14: button report size
* 20: button usage maximum
*/
mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 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_010D:
/*
* Report descriptor format:
* 12: button bit count
* 30: padding bit count
* 14: button report size
* 20: button usage maximum
*/
mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 8);
break;
case USB_DEVICE_ID_ELECOM_M_HT1DRBK_011C:
/*
* Report descriptor format:
* 22: button bit count
* 30: padding bit count
* 24: button report size
* 16: button usage maximum
*/
mouse_button_fixup(hdev, rdesc, *rsize, 22, 30, 24, 16, 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_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) },
{ 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_010D) },
{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1DRBK_011C) },
{ }
};
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");
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