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The ELECOM DEFT trackballs report only five buttons, when the device actually has 8. Change the descriptor so that the HID driver can see all of them. For completeness and future reference, I included a side-by-side diff of the part of the descriptor that is being edited. Cc: Jiri Kosina <jikos@kernel.org> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Yuxuan Shui <yshuiv7@gmail.com> Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
/*
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* HID driver for ELECOM devices.
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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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*/
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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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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_DEFT_WIRED:
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case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS:
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/* The DEFT trackball has eight buttons, but its descriptor only
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* reports five, disabling the three Fn buttons on the top of
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* the mouse.
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*
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* Apply the following diff to the descriptor:
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*
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* Collection (Physical), Collection (Physical),
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* Report ID (1), Report ID (1),
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* Report Count (5), -> Report Count (8),
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* Report Size (1), Report Size (1),
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* Usage Page (Button), Usage Page (Button),
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* Usage Minimum (01h), Usage Minimum (01h),
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* Usage Maximum (05h), -> Usage Maximum (08h),
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* Logical Minimum (0), Logical Minimum (0),
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* Logical Maximum (1), Logical Maximum (1),
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* Input (Variable), Input (Variable),
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* Report Count (1), -> Report Count (0),
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* Report Size (3), Report Size (3),
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* Input (Constant), Input (Constant),
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* Report Size (16), Report Size (16),
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* Report Count (2), Report Count (2),
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* Usage Page (Desktop), Usage Page (Desktop),
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* Usage (X), Usage (X),
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* Usage (Y), Usage (Y),
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* Logical Minimum (-32768), Logical Minimum (-32768),
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* Logical Maximum (32767), Logical Maximum (32767),
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* Input (Variable, Relative), Input (Variable, Relative),
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* End Collection, End Collection,
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*/
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if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) {
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hid_info(hdev, "Fixing up Elecom DEFT Fn buttons\n");
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rdesc[13] = 8; /* Button/Variable Report Count */
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rdesc[21] = 8; /* Button/Variable Usage Maximum */
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rdesc[29] = 0; /* Button/Constant Report Count */
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}
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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_DEFT_WIRED) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_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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