From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 46A982EC57A; Thu, 21 Aug 2025 14:38:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755787104; cv=none; b=kCbJ9bECXgu5YwBXdExqFbg52bInRNa2WAWcvaC4VRAUkCK+YLeE4t94R3tNjEjUPHCIry8zA2Y/OsiQ4mjd/hqKfXM0rv3q0tuRL+Oh3gZhtqAmEtF7BbXrbI/wNFgro2PQ4vSgSFbUoAYck223aKVQX7dMsXLuLx+uWcS0VwQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755787104; c=relaxed/simple; bh=ci+XWHC6JbntK+eo8OpgVrxWzQ9GdCDGAXlSRw2F/0w=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=B4q4yVK1j5vfNMF3/9qbhAUBmc4NyWhIA9IDqGNfxwP8wsZ4qcTCkvu+CF37JJzzsL7arYtKvupIBqBGGKwaMi7V9Zu2laZKNlFCRAEaza88QFVLAc90LBAV2FlXQNhyunVADkT1qYYbCqH6lsPVRxH1Sr4Ff+GzruLzdVdpCXU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Tr7QZvXF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Tr7QZvXF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D6F4C4CEEB; Thu, 21 Aug 2025 14:38:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755787104; bh=ci+XWHC6JbntK+eo8OpgVrxWzQ9GdCDGAXlSRw2F/0w=; h=From:Subject:Date:To:Cc:From; b=Tr7QZvXFxa5QMlmdilnHZSWo9z0K1KgAoC10nkA8tTfXbtymuYiblQCvpLYb8cQoz ibBFOC5Rdm62fq51BvMKFEdzIUoKv1qMgcdGluz8oaDnxEI+Mro96OWce4GoEnbj7x bUM6iZFqSGVj0Gvko8vdqhbhzCZ8m+xESWL1mZCrxnFmCJVXd8wTMlWuLWOYJhuRci URvL1lDPjRsdvG6ldT1TP37LTTcOv1faNIdmNjq9PgF15f+T5o5egUeq+N0C+Q/2/T K6OxCHLGUJcf0IpRll2gtgOn+W+KprvX8stlot6oyLhidsV8D5UNEkbqrx4CFQOgS4 LePNefgPUvu7g== From: Benjamin Tissoires Subject: [PATCH 0/2] HID: bpf: allow bpf to rebind a driver to hid-mutltiouch Date: Thu, 21 Aug 2025 16:38:12 +0200 Message-Id: <20250821-bpf-rescan-v1-0-08f9e2bc01bb@kernel.org> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAFQvp2gC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1MDCyND3aSCNN2i1OLkxDzdFBNzMxMLM9NkM/M0JaCGgqLUtMwKsGHRsbW 1AOnZ9pxcAAAA X-Change-ID: 20250821-bpf-rescan-d4764865c67f To: Jiri Kosina , Peter Hutterer Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755787102; l=961; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=ci+XWHC6JbntK+eo8OpgVrxWzQ9GdCDGAXlSRw2F/0w=; b=G1nknLlkWEDEBf53V72Lga6TBPufh/UBVIuh+GSm/HWi6YChZbs+AtJBkfdOY/gAAHRii1FsV GsX70Y3dGVIDd0R3IEpG2Ba6GQHzOPiigWZ1UGTVFoOTHxAVrEOfsMi X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= 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 --- 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