From: Coiby Xu <coiby.xu@gmail.com>
To: linux-input@vger.kernel.org
Cc: Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: Advice on fixing the bug of MSFT0001:00 04F3:Touchpad being handled by hid_multitouch by mistake
Date: Tue, 11 Aug 2020 17:14:45 +0800 [thread overview]
Message-ID: <20200811091445.erp2b23xmx3ceyzp@Rk> (raw)
Hi,
I'm working on a touchpad device issue as reported on
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1887190.
This touchpad device MSFT0001:00 04F3:Touchpad should be handled by
hid_rmi. But currently hid-core.c chooses hid_multitouch by mistake,
1. When scanning this device's report descriptor, HID_DG_CONTACTID
usage is found. Thus group HID_GROUP_MULTITOUCH is assigned to
the device.
2. The flag HID_SCAN_FLAG_MT_WIN_8 is also found. Thus group
HID_GROUP_MULTITOUCH_WIN_8 is assigned to the device.
3. hid-multitouch.c claims handling devices with the group of
HID_GROUP_MULTITOUCH_WIN_8
static const struct hid_device_id mt_devices[] = {
/* Generic MT device */
{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
/* Generic Win 8 certified MT device */
{ .driver_data = MT_CLS_WIN_8,
HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
HID_ANY_ID, HID_ANY_ID) },
{ }
};
There are several potential solutions,
- Let the device vendor fix this problem since this device's report
descriptor shouldn't have the HID_DG_CONTACTID usage.
- Make it a special case by setting the device's group to
HID_GROUP_RMI in hid_scan_report when vendor id and product ID
are matched.
- hid-quirks.c seems to be designed to handle special cases, is it
suitable for this case?
Can anyone give an advice on which direction I should take? Thank you!
--
Best regards,
Coiby
next reply other threads:[~2020-08-11 9:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-11 9:14 Coiby Xu [this message]
2020-09-04 8:16 ` Advice on fixing the bug of MSFT0001:00 04F3:Touchpad being handled by hid_multitouch by mistake Benjamin Tissoires
2020-09-04 14:59 ` Coiby Xu
2020-09-04 16:47 ` Benjamin Tissoires
2020-09-10 16:37 ` Coiby Xu
2020-09-11 12:29 ` Benjamin Tissoires
2020-09-15 10:14 ` Coiby Xu
2020-09-24 7:17 ` Coiby Xu
2020-10-09 8:26 ` Coiby Xu
2020-10-09 8:55 ` Benjamin Tissoires
2020-10-14 22:09 ` Coiby Xu
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