From nobody Tue Nov 26 15:25:52 2024 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 667921DF745; Thu, 17 Oct 2024 16:35:11 +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=1729182911; cv=none; b=eFS+GmY1NIt4Yt87BQxdtqR7Y5svfOnVQDQcC4GP012vZwuZFyDdcugrpuYKtgS3/cDcPzsuX6bPl3/7ALLhUI+sBB80getPX/5Z4rxuXFMA8F2uof6EUUhSBh7Gbh+Rp6L8CFodHxeLOwln4MdD3K+Wsw3dqN8nV4HPz+h6EJY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729182911; c=relaxed/simple; bh=pgm6wn80wXgtOLXNt5NNVQ0KRgGvvi85msQODBFXiNs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=GTjWcMU6q/pLLxCI4uvRx0L4H0Jl3a0G4sUOZBe4OoE9l/Bgcrk8LGq7nNGSVTii0Dv7mbTsUaCbSghMELHCKgEh0R6OYeGRjzvy1JfL/jB/0/sTszvJLE5syaofpShXlHO9NKWt2NH/utNTBhG7eACuo51onFa7JJ2pOoO2vz8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gYsMrfal; 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="gYsMrfal" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8231C4CECE; Thu, 17 Oct 2024 16:35:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729182910; bh=pgm6wn80wXgtOLXNt5NNVQ0KRgGvvi85msQODBFXiNs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=gYsMrfalrgaSoD2ejidStOpGz4S/SUbbuS5atO/9KM8vciaDG23LMg9DZyGgQaoHQ O+gukJl8qioQb4B/2AdFn4SQbArKzLq9aHYduNsDcNhbKMzi658fzMydcgLqYETVg/ w4oMWo9zMRGxyvs3so9Gdpl+u7TZ+c/uj2+lwyEgPMgUntacb2IeN2abdEFuky5v+4 Z2gBu1s85rtMK7wUDJEoZW26tWPnqLfTuz0CwsxrAFt81pQ8DSkup4/2yMlzUqvP5M Hzf76SYNoRY+8TRvlStp0T1IFPi0ckYx9UcT9mALm0jQtLmclmZ13wnriPfmyFdxlH 1JomV32FxV+Qg== From: Benjamin Tissoires Date: Thu, 17 Oct 2024 18:34:58 +0200 Subject: [PATCH v2 1/3] HID: bpf: Fix NKRO on Mistel MD770 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241017-import_bpf_6-13-v2-1-6a7acb89a97f@kernel.org> References: <20241017-import_bpf_6-13-v2-0-6a7acb89a97f@kernel.org> In-Reply-To: <20241017-import_bpf_6-13-v2-0-6a7acb89a97f@kernel.org> To: Jiri Kosina Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, Benjamin Tissoires , Tatsuyuki Ishi X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729182907; l=8943; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=pgm6wn80wXgtOLXNt5NNVQ0KRgGvvi85msQODBFXiNs=; b=envTh4+vvHtrEFcPPeWA48uoPe4P/63vQwdsFW4bou/6m91v1d1b3ySj5INVsWVAxLsb2QP18 3Az6Cv0kiwoCHxG/zS9JDv3RnPC5ucXQsxcmhr2ZkdFXDSvVeu3LIxT X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= 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. Tested by loading the BPF program and confirming that 8 simultaneous keypresses work. Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D218495 Link: https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/merge_requests= /122 Signed-off-by: Tatsuyuki Ishi Signed-off-by: Benjamin Tissoires --- no changes in v2 --- drivers/hid/bpf/progs/Mistel__MD770.bpf.c | 154 ++++++++++++++++++++++++++= ++++ 1 file changed, 154 insertions(+) diff --git a/drivers/hid/bpf/progs/Mistel__MD770.bpf.c b/drivers/hid/bpf/pr= ogs/Mistel__MD770.bpf.c new file mode 100644 index 0000000000000000000000000000000000000000..fb8b5a6968b125ed88a456aefb4= 27ede0e0bfa9b --- /dev/null +++ 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 has = 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 <- chang= e 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 2.47.0