From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from jabberwock.ucw.cz (jabberwock.ucw.cz [46.255.230.98]) (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 39DAD205AD5; Mon, 2 Dec 2024 12:08:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.255.230.98 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733141283; cv=none; b=lW4pEYeesg8wB107FwbUGPdSdXWtCYG9agw3keiofz8V+kYkhsrE4QJa53ZQSMVE8LtHSAEQ86MHeaz/O3ryNH+IyvQE8/E1pwFIQv5z+C4UW/A/txug+5MdzLjsYK9MnIdoJ80okuDPStC8JEMzOLL6g8+6rnRksxB7fZ2x75c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733141283; c=relaxed/simple; bh=irNblZLdrYCtBnpyQvHjSa1m/xatk0N7MgeGuCUEzDI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ia9rCWdoV7ntNvWb8SR1DwBku5jktmVACprU3HkenLE/sQhSVunXDtDXnnzoT+n9qnuA+RsBuykBCwaFi6hOaEFowl0NVARuuoIXN2AGoSYJhCzhnrF60zN2cP3g+f1HT8KY0+bb/K2C6oGNqQ0rFmuIvIaTftwz0rx8XwZxyOs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=denx.de; spf=fail smtp.mailfrom=denx.de; arc=none smtp.client-ip=46.255.230.98 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=denx.de Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=denx.de Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id 7789D1C00C4; Mon, 2 Dec 2024 13:07:59 +0100 (CET) Date: Mon, 2 Dec 2024 13:07:58 +0100 From: Pavel Machek To: Sasha Levin Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, Benjamin Tissoires , Tatsuyuki Ishi , Jiri Kosina , jikos@kernel.org, linux-input@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH AUTOSEL 4.19 4/4] HID: bpf: Fix NKRO on Mistel MD770 Message-ID: References: <20241124125856.3341388-1-sashal@kernel.org> <20241124125856.3341388-4-sashal@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="vsDwWDiTVz93/nan" Content-Disposition: inline In-Reply-To: <20241124125856.3341388-4-sashal@kernel.org> --vsDwWDiTVz93/nan Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > From: Benjamin Tissoires >=20 > [ Upstream commit 9bc089307e8dff7797233308372b4a90ce8f79be ] >=20 > Mistel MD770 keyboard (using Holtek Semiconductor, Inc. controller) has > a quirk in report descriptor in one of its interfaces (more detail in > the source file). Fix up the descriptor to allow NKRO to work again. >=20 > Tested by loading the BPF program and confirming that 8 simultaneous > keypresses work. Ummm. No. drivers/hid/bpf/progs/ not existing in 4.19 should be a hint. Best regards, Pavel =09 > +++ b/drivers/hid/bpf/progs/Mistel__MD770.bpf.c > @@ -0,0 +1,154 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright (c) 2024 Tatsuyuki Ishi > + */ > + > +#include "vmlinux.h" > +#include "hid_bpf.h" > +#include "hid_bpf_helpers.h" > +#include > + > +#define VID_HOLTEK 0x04D9 > +#define PID_MD770 0x0339 > +#define RDESC_SIZE 203 > + > +HID_BPF_CONFIG( > + HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_HOLTEK, PID_MD770) > +); > + > +/* > + * The Mistel MD770 keyboard reports the first 6 simultaneous key presses > + * through the first interface, and anything beyond that through a second > + * interface. Unfortunately, the second interface's report descriptor ha= s an > + * error, causing events to be malformed and ignored. This HID-BPF driver > + * fixes the descriptor to allow NKRO to work again. > + * > + * For reference, this is the original report descriptor: > + * > + * 0x05, 0x01, // Usage Page (Generic Desktop) 0 > + * 0x09, 0x80, // Usage (System Control) 2 > + * 0xa1, 0x01, // Collection (Application) 4 > + * 0x85, 0x01, // Report ID (1) 6 > + * 0x19, 0x81, // Usage Minimum (129) 8 > + * 0x29, 0x83, // Usage Maximum (131) 10 > + * 0x15, 0x00, // Logical Minimum (0) 12 > + * 0x25, 0x01, // Logical Maximum (1) 14 > + * 0x95, 0x03, // Report Count (3) 16 > + * 0x75, 0x01, // Report Size (1) 18 > + * 0x81, 0x02, // Input (Data,Var,Abs) 20 > + * 0x95, 0x01, // Report Count (1) 22 > + * 0x75, 0x05, // Report Size (5) 24 > + * 0x81, 0x01, // Input (Cnst,Arr,Abs) 26 > + * 0xc0, // End Collection 28 > + * 0x05, 0x0c, // Usage Page (Consumer Devices) 29 > + * 0x09, 0x01, // Usage (Consumer Control) 31 > + * 0xa1, 0x01, // Collection (Application) 33 > + * 0x85, 0x02, // Report ID (2) 35 > + * 0x15, 0x00, // Logical Minimum (0) 37 > + * 0x25, 0x01, // Logical Maximum (1) 39 > + * 0x95, 0x12, // Report Count (18) 41 > + * 0x75, 0x01, // Report Size (1) 43 > + * 0x0a, 0x83, 0x01, // Usage (AL Consumer Control Config) 45 > + * 0x0a, 0x8a, 0x01, // Usage (AL Email Reader) 48 > + * 0x0a, 0x92, 0x01, // Usage (AL Calculator) 51 > + * 0x0a, 0x94, 0x01, // Usage (AL Local Machine Browser) 54 > + * 0x09, 0xcd, // Usage (Play/Pause) 57 > + * 0x09, 0xb7, // Usage (Stop) 59 > + * 0x09, 0xb6, // Usage (Scan Previous Track) 61 > + * 0x09, 0xb5, // Usage (Scan Next Track) 63 > + * 0x09, 0xe2, // Usage (Mute) 65 > + * 0x09, 0xea, // Usage (Volume Down) 67 > + * 0x09, 0xe9, // Usage (Volume Up) 69 > + * 0x0a, 0x21, 0x02, // Usage (AC Search) 71 > + * 0x0a, 0x23, 0x02, // Usage (AC Home) 74 > + * 0x0a, 0x24, 0x02, // Usage (AC Back) 77 > + * 0x0a, 0x25, 0x02, // Usage (AC Forward) 80 > + * 0x0a, 0x26, 0x02, // Usage (AC Stop) 83 > + * 0x0a, 0x27, 0x02, // Usage (AC Refresh) 86 > + * 0x0a, 0x2a, 0x02, // Usage (AC Bookmarks) 89 > + * 0x81, 0x02, // Input (Data,Var,Abs) 92 > + * 0x95, 0x01, // Report Count (1) 94 > + * 0x75, 0x0e, // Report Size (14) 96 > + * 0x81, 0x01, // Input (Cnst,Arr,Abs) 98 > + * 0xc0, // End Collection 100 > + * 0x05, 0x01, // Usage Page (Generic Desktop) 101 > + * 0x09, 0x02, // Usage (Mouse) 103 > + * 0xa1, 0x01, // Collection (Application) 105 > + * 0x09, 0x01, // Usage (Pointer) 107 > + * 0xa1, 0x00, // Collection (Physical) 109 > + * 0x85, 0x03, // Report ID (3) 111 > + * 0x05, 0x09, // Usage Page (Button) 113 > + * 0x19, 0x01, // Usage Minimum (1) 115 > + * 0x29, 0x08, // Usage Maximum (8) 117 > + * 0x15, 0x00, // Logical Minimum (0) 119 > + * 0x25, 0x01, // Logical Maximum (1) 121 > + * 0x75, 0x01, // Report Size (1) 123 > + * 0x95, 0x08, // Report Count (8) 125 > + * 0x81, 0x02, // Input (Data,Var,Abs) 127 > + * 0x05, 0x01, // Usage Page (Generic Desktop) 129 > + * 0x09, 0x30, // Usage (X) 131 > + * 0x09, 0x31, // Usage (Y) 133 > + * 0x16, 0x01, 0x80, // Logical Minimum (-32767) 135 > + * 0x26, 0xff, 0x7f, // Logical Maximum (32767) 138 > + * 0x75, 0x10, // Report Size (16) 141 > + * 0x95, 0x02, // Report Count (2) 143 > + * 0x81, 0x06, // Input (Data,Var,Rel) 145 > + * 0x09, 0x38, // Usage (Wheel) 147 > + * 0x15, 0x81, // Logical Minimum (-127) 149 > + * 0x25, 0x7f, // Logical Maximum (127) 151 > + * 0x75, 0x08, // Report Size (8) 153 > + * 0x95, 0x01, // Report Count (1) 155 > + * 0x81, 0x06, // Input (Data,Var,Rel) 157 > + * 0x05, 0x0c, // Usage Page (Consumer Devices) 159 > + * 0x0a, 0x38, 0x02, // Usage (AC Pan) 161 > + * 0x95, 0x01, // Report Count (1) 164 > + * 0x81, 0x06, // Input (Data,Var,Rel) 166 > + * 0xc0, // End Collection 168 > + * 0xc0, // End Collection 169 > + * 0x05, 0x01, // Usage Page (Generic Desktop) 170 > + * 0x09, 0x06, // Usage (Keyboard) 172 > + * 0xa1, 0x01, // Collection (Application) 174 > + * 0x85, 0x04, // Report ID (4) 176 > + * 0x05, 0x07, // Usage Page (Keyboard) 178 > + * 0x95, 0x01, // Report Count (1) 180 > + * 0x75, 0x08, // Report Size (8) 182 > + * 0x81, 0x03, // Input (Cnst,Var,Abs) 184 > + * 0x95, 0xe8, // Report Count (232) 186 > + * 0x75, 0x01, // Report Size (1) 188 > + * 0x15, 0x00, // Logical Minimum (0) 190 > + * 0x25, 0x01, // Logical Maximum (1) 192 > + * 0x05, 0x07, // Usage Page (Keyboard) 194 > + * 0x19, 0x00, // Usage Minimum (0) 196 > + * 0x29, 0xe7, // Usage Maximum (231) 198 > + * 0x81, 0x00, // Input (Data,Arr,Abs) 200 <- cha= nge to 0x81, 0x02 (Data,Var,Abs) > + * 0xc0, // End Collection 202 > + */ > + > +SEC(HID_BPF_RDESC_FIXUP) > +int BPF_PROG(hid_rdesc_fixup_mistel_md770, struct hid_bpf_ctx *hctx) > +{ > + __u8 *data =3D hid_bpf_get_data(hctx, 0, HID_MAX_DESCRIPTOR_SIZE); > + > + if (!data) > + return 0; /* EPERM check */ > + > + if (data[201] =3D=3D 0x00) > + data[201] =3D 0x02; > + > + return 0; > +} > + > +HID_BPF_OPS(mistel_md770) =3D { > + .hid_rdesc_fixup =3D (void *)hid_rdesc_fixup_mistel_md770, > +}; > + > +SEC("syscall") > +int probe(struct hid_bpf_probe_args *ctx) > +{ > + ctx->retval =3D ctx->rdesc_size !=3D RDESC_SIZE; > + if (ctx->retval) > + ctx->retval =3D -EINVAL; > + > + return 0; > +} > + > +char _license[] SEC("license") =3D "GPL"; --=20 DENX Software Engineering GmbH, Managing Director: Erika Unter HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany --vsDwWDiTVz93/nan Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQRPfPO7r0eAhk010v0w5/Bqldv68gUCZ02jHgAKCRAw5/Bqldv6 8mBpAJ4+zrTF62wmLMLh/dDetCm2qKVLdgCeJpSDNMGscifSd8bvj38q0sGxIk4= =c6pS -----END PGP SIGNATURE----- --vsDwWDiTVz93/nan--