128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* HID driver for ELECOM devices:
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* - BM084 Bluetooth Mouse
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* - EX-G Trackballs (M-XT3DRBK, M-XT3URBK, M-XT4DRBK)
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* - DEFT Trackballs (M-DT1DRBK, M-DT1URBK, M-DT2DRBK, M-DT2URBK)
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* - HUGE Trackballs (M-HT1DRBK, M-HT1URBK)
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*
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* Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com>
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* Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com>
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* Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu>
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* Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org>
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* Copyright (c) 2017 Tomasz Kramkowski <tk@the-tk.com>
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* Copyright (c) 2020 YOSHIOKA Takuma <lo48576@hard-wi.red>
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*/
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/*
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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/*
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* Certain ELECOM mice misreport their button count meaning that they only work
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* correctly with the ELECOM mouse assistant software which is unavailable for
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* Linux. A four extra INPUT reports and a FEATURE report are described by the
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* report descriptor but it does not appear that these enable software to
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* control what the extra buttons map to. The only simple and straightforward
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* solution seems to involve fixing up the report descriptor.
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*/
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#define MOUSE_BUTTONS_MAX 8
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static void mouse_button_fixup(struct hid_device *hdev,
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__u8 *rdesc, unsigned int rsize,
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unsigned int button_bit_count,
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unsigned int padding_bit,
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unsigned int button_report_size,
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unsigned int button_usage_maximum,
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int nbuttons)
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{
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if (rsize < 32 || rdesc[button_bit_count] != 0x95 ||
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rdesc[button_report_size] != 0x75 ||
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rdesc[button_report_size + 1] != 0x01 ||
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rdesc[button_usage_maximum] != 0x29 || rdesc[padding_bit] != 0x75)
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return;
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hid_info(hdev, "Fixing up Elecom mouse button count\n");
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nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX);
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rdesc[button_bit_count + 1] = nbuttons;
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rdesc[button_usage_maximum + 1] = nbuttons;
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rdesc[padding_bit + 1] = MOUSE_BUTTONS_MAX - nbuttons;
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}
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static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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switch (hdev->product) {
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case USB_DEVICE_ID_ELECOM_BM084:
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/* The BM084 Bluetooth mouse includes a non-existing horizontal
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* wheel in the HID descriptor. */
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if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) {
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hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n");
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rdesc[47] = 0x00;
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}
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break;
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case USB_DEVICE_ID_ELECOM_M_XGL20DLBK:
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/*
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* Report descriptor format:
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* 20: button bit count
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* 28: padding bit count
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* 22: button report size
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* 14: button usage maximum
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*/
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mouse_button_fixup(hdev, rdesc, *rsize, 20, 28, 22, 14, 8);
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break;
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case USB_DEVICE_ID_ELECOM_M_XT3URBK:
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case USB_DEVICE_ID_ELECOM_M_XT3DRBK:
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case USB_DEVICE_ID_ELECOM_M_XT4DRBK:
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/*
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* Report descriptor format:
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* 12: button bit count
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* 30: padding bit count
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* 14: button report size
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* 20: button usage maximum
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*/
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mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 6);
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break;
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case USB_DEVICE_ID_ELECOM_M_DT1URBK:
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case USB_DEVICE_ID_ELECOM_M_DT1DRBK:
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case USB_DEVICE_ID_ELECOM_M_HT1URBK:
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case USB_DEVICE_ID_ELECOM_M_HT1DRBK:
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/*
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* Report descriptor format:
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* 12: button bit count
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* 30: padding bit count
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* 14: button report size
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* 20: button usage maximum
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*/
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mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 8);
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break;
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}
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return rdesc;
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}
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static const struct hid_device_id elecom_devices[] = {
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{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XGL20DLBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3URBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3DRBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT4DRBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1URBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1DRBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1URBK) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1DRBK) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, elecom_devices);
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static struct hid_driver elecom_driver = {
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.name = "elecom",
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.id_table = elecom_devices,
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.report_fixup = elecom_report_fixup
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};
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module_hid_driver(elecom_driver);
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MODULE_LICENSE("GPL");
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