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[71.34.65.148]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7d823736630sm4406787a12.9.2024.09.09.13.32.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 13:32:11 -0700 (PDT) From: "Gerecke, Jason" X-Google-Original-From: "Gerecke, Jason" To: linux-input@vger.kernel.org, Benjamin Tissoires , Jiri Kosina Cc: Ping Cheng , Joshua Dickens , Jason Gerecke , Joshua Dickens Subject: [PATCH 1/2] HID: wacom: Support sequence numbers smaller than 16-bit Date: Mon, 9 Sep 2024 13:32:07 -0700 Message-ID: <20240909203208.47339-1-jason.gerecke@wacom.com> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jason Gerecke The current dropped packet reporting assumes that all sequence numbers are 16 bits in length. This results in misleading "Dropped" messages if the hardware uses fewer bits. For example, if a tablet uses only 8 bits to store its sequence number, once it rolls over from 255 -> 0, the driver will still be expecting a packet "256". This patch adjusts the logic to reset the next expected packet to logical_minimum whenever it overflows beyond logical_maximum. Signed-off-by: Jason Gerecke Tested-by: Joshua Dickens Fixes: 6d09085b38e5 ("HID: wacom: Adding Support for new usages") --- drivers/hid/wacom_wac.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 74258a78d0408..cef08737a6240 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -2512,9 +2512,14 @@ static void wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field wacom_wac->hid_data.barrelswitch3 = value; return; case WACOM_HID_WD_SEQUENCENUMBER: - if (wacom_wac->hid_data.sequence_number != value) - hid_warn(hdev, "Dropped %hu packets", (unsigned short)(value - wacom_wac->hid_data.sequence_number)); + if (wacom_wac->hid_data.sequence_number != value) { + int sequence_size = field->logical_maximum - field->logical_minimum + 1; + int drop_count = (value - wacom_wac->hid_data.sequence_number) % sequence_size; + hid_warn(hdev, "Dropped %d packets", drop_count); + } wacom_wac->hid_data.sequence_number = value + 1; + if (wacom_wac->hid_data.sequence_number > field->logical_maximum) + wacom_wac->hid_data.sequence_number = field->logical_minimum; return; } From patchwork Mon Sep 9 20:32:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gerecke, Jason" X-Patchwork-Id: 13797564 X-Patchwork-Delegate: jikos@jikos.cz Received: from mail-pg1-f169.google.com (mail-pg1-f169.google.com [209.85.215.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F3006189F57 for ; Mon, 9 Sep 2024 20:32:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725913936; cv=none; b=hEB+9TYeFeEPrsBoaFRaNn16fAGnLxRBOHjtMcai+sWvq/ry/sEJTXRN3OkRWUHvz8aVUtm6tVlbc/ylOIX41oRZw2ZMZ7hqs7TMbNcga7VOC8l+1ANutCTb0hnDt3oUfkXYFt8u+o1gJxEHPxlgyuJl78cBJ1XwqAvUnx/T6ng= ARC-Message-Signature: i=1; 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[71.34.65.148]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7d823736630sm4406787a12.9.2024.09.09.13.32.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 13:32:13 -0700 (PDT) From: "Gerecke, Jason" X-Google-Original-From: "Gerecke, Jason" To: linux-input@vger.kernel.org, Benjamin Tissoires , Jiri Kosina Cc: Ping Cheng , Joshua Dickens , Jason Gerecke , Joshua Dickens Subject: [PATCH 2/2] HID: wacom: Do not warn about dropped packets for first packet Date: Mon, 9 Sep 2024 13:32:08 -0700 Message-ID: <20240909203208.47339-2-jason.gerecke@wacom.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240909203208.47339-1-jason.gerecke@wacom.com> References: <20240909203208.47339-1-jason.gerecke@wacom.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jason Gerecke The driver currently assumes that the first sequence number it will see is going to be 0. This is not a realiable assumption and can break if, for example, the tablet has already been running for some time prior to the kernel driver connecting to the device. This commit initializes the expected sequence number to -1 and will only print the "Dropped" warning the it has been updated to a non-negative value. Signed-off-by: Jason Gerecke Tested-by: Joshua Dickens Fixes: 6d09085b38e5 ("HID: wacom: Adding Support for new usages") --- drivers/hid/wacom_wac.c | 6 +++++- drivers/hid/wacom_wac.h | 2 +- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index cef08737a6240..59a13ad9371cd 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -2388,6 +2388,9 @@ static void wacom_wac_pen_usage_mapping(struct hid_device *hdev, wacom_map_usage(input, usage, field, EV_KEY, BTN_STYLUS3, 0); features->quirks &= ~WACOM_QUIRK_PEN_BUTTON3; break; + case WACOM_HID_WD_SEQUENCENUMBER: + wacom_wac->hid_data.sequence_number = -1; + break; } } @@ -2512,7 +2515,8 @@ static void wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field wacom_wac->hid_data.barrelswitch3 = value; return; case WACOM_HID_WD_SEQUENCENUMBER: - if (wacom_wac->hid_data.sequence_number != value) { + if (wacom_wac->hid_data.sequence_number != value && + wacom_wac->hid_data.sequence_number >= 0) { int sequence_size = field->logical_maximum - field->logical_minimum + 1; int drop_count = (value - wacom_wac->hid_data.sequence_number) % sequence_size; hid_warn(hdev, "Dropped %d packets", drop_count); diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h index 55e0c7a9fdcb4..c8803d5c6a71e 100644 --- a/drivers/hid/wacom_wac.h +++ b/drivers/hid/wacom_wac.h @@ -326,7 +326,7 @@ struct hid_data { int bat_connected; int ps_connected; bool pad_input_event_flag; - unsigned short sequence_number; + int sequence_number; ktime_t time_delayed; };