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hid: topre: Add driver fixing report descriptor

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The Topre REALFORCE R2 firmware incorrectly reports that interface
descriptor number 1, input report descriptor 2's events are array events
rather than variable events. That particular report descriptor is used
to report keypresses when there are more than 6 keys held at a time.
This bug prevents events from this interface from being registered
properly, so only 6 keypresses (from a different interface) can be
registered at once, rather than full n-key rollover.

This commit fixes the bug by setting the correct value in a report_fixup
function.

The original bug report can be found here:
Link: https://gitlab.freedesktop.org/libinput/libinput/-/issues/804

Thanks to Benjamin Tissoires for diagnosing the issue with the report
descriptor.

Signed-off-by: Harry Stern <harry@harrystern.net>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220911003614.297613-1-harry@harrystern.net
This commit is contained in:
Harry Stern 2022-09-10 20:36:13 -04:00 committed by Benjamin Tissoires
parent a1f764268f
commit a109d5c45b
4 changed files with 59 additions and 0 deletions
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6
drivers/hid/Kconfig
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@ -1141,6 +1141,12 @@ config HID_TOPSEED
Say Y if you have a TopSeed Cyberlink or BTC Emprex or Conceptronic
CLLRCMCE remote control.
config HID_TOPRE
tristate "Topre REALFORCE keyboards"
depends on HID
help
Say Y for N-key rollover support on Topre REALFORCE R2 108 key keyboards.
config HID_THINGM
tristate "ThingM blink(1) USB RGB LED"
depends on HID

1
drivers/hid/Makefile
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@ -123,6 +123,7 @@ obj-$(CONFIG_HID_GREENASIA) += hid-gaff.o
obj-$(CONFIG_HID_THRUSTMASTER) += hid-tmff.o hid-thrustmaster.o
obj-$(CONFIG_HID_TIVO) += hid-tivo.o
obj-$(CONFIG_HID_TOPSEED) += hid-topseed.o
obj-$(CONFIG_HID_TOPRE) += hid-topre.o
obj-$(CONFIG_HID_TWINHAN) += hid-twinhan.o
obj-$(CONFIG_HID_U2FZERO) += hid-u2fzero.o
hid-uclogic-objs := hid-uclogic-core.o \

3
drivers/hid/hid-ids.h
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@ -1231,6 +1231,9 @@
#define USB_DEVICE_ID_TIVO_SLIDE 0x1201
#define USB_DEVICE_ID_TIVO_SLIDE_PRO 0x1203
#define USB_VENDOR_ID_TOPRE 0x0853
#define USB_DEVICE_ID_TOPRE_REALFORCE_R2_108 0x0148
#define USB_VENDOR_ID_TOPSEED 0x0766
#define USB_DEVICE_ID_TOPSEED_CYBERLINK 0x0204

49
drivers/hid/hid-topre.c Normal file
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@ -0,0 +1,49 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* HID driver for Topre REALFORCE Keyboards
*
* Copyright (c) 2022 Harry Stern <harry@harrystern.net>
*
* Based on the hid-macally driver
*/
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"
MODULE_AUTHOR("Harry Stern <harry@harrystern.net>");
MODULE_DESCRIPTION("REALFORCE R2 Keyboard driver");
MODULE_LICENSE("GPL");
/*
* Fix the REALFORCE R2's non-boot interface's report descriptor to match the
* events it's actually sending. It claims to send array events but is instead
* sending variable events.
*/
static __u8 *topre_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
if (*rsize >= 119 && rdesc[69] == 0x29 && rdesc[70] == 0xe7 &&
rdesc[71] == 0x81 && rdesc[72] == 0x00) {
hid_info(hdev,
"fixing up Topre REALFORCE keyboard report descriptor\n");
rdesc[72] = 0x02;
}
return rdesc;
}
static const struct hid_device_id topre_id_table[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
USB_DEVICE_ID_TOPRE_REALFORCE_R2_108) },
{ }
};
MODULE_DEVICE_TABLE(hid, topre_id_table);
static struct hid_driver topre_driver = {
.name = "topre",
.id_table = topre_id_table,
.report_fixup = topre_report_fixup,
};
module_hid_driver(topre_driver);