102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
/*
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* HID driver for ELECOM devices:
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* - BM084 Bluetooth Mouse
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* - EX-G Trackball (Wired and wireless)
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* - DEFT Trackball (Wired and wireless)
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* - HUGE Trackball (Wired and wireless)
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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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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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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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* Report descriptor format:
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* Positions 13, 15, 21 and 31 store the button bit count, button usage minimum,
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* button usage maximum and padding bit count respectively.
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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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int nbuttons)
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{
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if (rsize < 32 || rdesc[12] != 0x95 ||
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rdesc[14] != 0x75 || rdesc[15] != 0x01 ||
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rdesc[20] != 0x29 || rdesc[30] != 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[13] = nbuttons;
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rdesc[21] = nbuttons;
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rdesc[31] = 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_EX_G_WIRED:
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case USB_DEVICE_ID_ELECOM_EX_G_WIRELESS:
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mouse_button_fixup(hdev, rdesc, *rsize, 6);
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break;
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case USB_DEVICE_ID_ELECOM_DEFT_WIRED:
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case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS:
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case USB_DEVICE_ID_ELECOM_HUGE_WIRED:
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case USB_DEVICE_ID_ELECOM_HUGE_WIRELESS:
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mouse_button_fixup(hdev, rdesc, *rsize, 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_EX_G_WIRED) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_EX_G_WIRELESS) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRED) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRELESS) },
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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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