linux-kernel - [PATCH 0/2] HID: bpf: allow bpf to rebind a driver to hid-mutltiouch

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Message-Id: <20250821-bpf-rescan-v1-0-08f9e2bc01bb@kernel.org>
Date: Thu, 21 Aug 2025 16:38:12 +0200
From: Benjamin Tissoires <bentiss@...nel.org>
To: Jiri Kosina <jikos@...nel.org>, 
 Peter Hutterer <peter.hutterer@...-t.net>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Benjamin Tissoires <bentiss@...nel.org>
Subject: [PATCH 0/2] HID: bpf: allow bpf to rebind a driver to
 hid-mutltiouch

This happened while Peter was trying to fix a Viewsonic device: the HID
device sending multiotuch data through a proprietary collection was
handled by hid-generic, and we don't have any way of attaching it to
hid-multitouch because the pre-scanning wasn't able to see the Contact
ID HID usage.

After a little of back and forth, it turns out that the best solution is
to re-scan the device when a report descriptor is changed from the BPF
point of view.

Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
---
Benjamin Tissoires (2):
      HID: core: factor out hid_set_group()
      HID: bpf: rescan the device for the group after a load/unload

 drivers/hid/hid-core.c | 44 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 36 insertions(+), 8 deletions(-)
---
base-commit: f55f91622e6f10884d30049f6748588b3718eecd
change-id: 20250821-bpf-rescan-d4764865c67f

Best regards,
-- 
Benjamin Tissoires <bentiss@...nel.org>