From nobody Sat Nov 15 19:04:43 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1749486887; cv=none; d=zohomail.com; s=zohoarc; b=hRF8QJ16gxrcd5KqsU6Qa9o/BqWKIXfCwB3IcE1is2Lap7ZPzRa5f51mZj42WOzmHW7FQ2caOeFmg0Lia4kESVsnjOrJ4bWnAKr2xIC4pM8ylsejLTrgBvEcAKRpdx263T6Pm1N8NsWBTJPWUNhb6TZdwvbVrbaY8klKNlsbRRg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1749486887; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:Reply-To:References:Sender:Subject:Subject:To:To:Message-Id; bh=j/NflZww90rTdO2AvZOIhqyHNfBq4ET39HHwz13O6fA=; b=JGZbqTaMBivMSOCuMgcqGuJ39cYpxPiu4ReAtoOINClwmqf/GSSp7+fPd54yPG0jNrvk4UU2L8F1fFPoubhQoz3PN4khcgihBohk9z0VqapaqN0TyEBCRrrgz/pSIjdAY1WzpIzNKe0Biu1rFr+rxpBMs17ndJDf0BvkogvOomw= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1749486887452978.9854205407235; Mon, 9 Jun 2025 09:34:47 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uOfSJ-00025w-Ou; Mon, 09 Jun 2025 12:34:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uOfRt-0001YB-26 for qemu-devel@nongnu.org; Mon, 09 Jun 2025 12:34:21 -0400 Received: from [185.176.79.56] (helo=frasgout.his.huawei.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uOfRq-0001YA-UD for qemu-devel@nongnu.org; Mon, 09 Jun 2025 12:34:12 -0400 Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4bGHYP30K0z6M52w; Tue, 10 Jun 2025 00:33:45 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id F0FC91404C5; Tue, 10 Jun 2025 00:34:06 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.19.247) by frapeml500008.china.huawei.com (7.182.85.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Mon, 9 Jun 2025 18:34:06 +0200 To: Klaus Jensen , , Fan Ni , Anisa Su , , , CC: , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [RFC PATCH qemu 1/5] hw/i2c: add smbus pec utility function Date: Mon, 9 Jun 2025 17:33:29 +0100 Message-ID: <20250609163334.922346-2-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250609163334.922346-1-Jonathan.Cameron@huawei.com> References: <20250609163334.922346-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.122.19.247] X-ClientProxiedBy: lhrpeml100012.china.huawei.com (7.191.174.184) To frapeml500008.china.huawei.com (7.182.85.71) X-Host-Lookup-Failed: Reverse DNS lookup failed for 185.176.79.56 (deferred) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron From: Jonathan Cameron via Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1749486887914116600 Content-Type: text/plain; charset="utf-8" From: Klaus Jensen Add i2c_smbus_pec() to calculate the SMBus Packet Error Code for a message. Reviewed-by: Jonathan Cameron Signed-off-by: Klaus Jensen Acked-by: Corey Minyard Link: https://lore.kernel.org/r/20230914-nmi-i2c-v6-1-11bbb4f74d18@samsung.= com Signed-off-by: Jonathan Cameron --- include/hw/i2c/smbus_master.h | 2 ++ hw/i2c/smbus_master.c | 26 ++++++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/include/hw/i2c/smbus_master.h b/include/hw/i2c/smbus_master.h index bb13bc423c..d90f81767d 100644 --- a/include/hw/i2c/smbus_master.h +++ b/include/hw/i2c/smbus_master.h @@ -27,6 +27,8 @@ =20 #include "hw/i2c/i2c.h" =20 +uint8_t i2c_smbus_pec(uint8_t crc, uint8_t *buf, size_t len); + /* Master device commands. */ int smbus_quick_command(I2CBus *bus, uint8_t addr, int read); int smbus_receive_byte(I2CBus *bus, uint8_t addr); diff --git a/hw/i2c/smbus_master.c b/hw/i2c/smbus_master.c index 6a53c34e70..01a8e47002 100644 --- a/hw/i2c/smbus_master.c +++ b/hw/i2c/smbus_master.c @@ -15,6 +15,32 @@ #include "hw/i2c/i2c.h" #include "hw/i2c/smbus_master.h" =20 +static uint8_t crc8(uint16_t data) +{ + int i; + + for (i =3D 0; i < 8; i++) { + if (data & 0x8000) { + data ^=3D 0x1070U << 3; + } + + data <<=3D 1; + } + + return (uint8_t)(data >> 8); +} + +uint8_t i2c_smbus_pec(uint8_t crc, uint8_t *buf, size_t len) +{ + int i; + + for (i =3D 0; i < len; i++) { + crc =3D crc8((crc ^ buf[i]) << 8); + } + + return crc; +} + /* Master device commands. */ int smbus_quick_command(I2CBus *bus, uint8_t addr, int read) { --=20 2.48.1