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Nguyen" Subject: [PATCH v1 1/3] i2c: i2c-core-smbus: Expose PEC calculate function for generic use Date: Mon, 29 Mar 2021 19:09:12 +0700 Message-Id: <20210329120914.4527-2-quan@os.amperecomputing.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210329120914.4527-1-quan@os.amperecomputing.com> References: <20210329120914.4527-1-quan@os.amperecomputing.com> X-Originating-IP: [118.69.219.201] X-ClientProxiedBy: HKAPR04CA0010.apcprd04.prod.outlook.com (2603:1096:203:d0::20) To MW2PR0102MB3482.prod.exchangelabs.com (2603:10b6:302:c::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from hcm-sw-17.amperecomputing.com (118.69.219.201) by HKAPR04CA0010.apcprd04.prod.outlook.com (2603:1096:203:d0::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.26 via Frontend Transport; Mon, 29 Mar 2021 12:09:35 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 949c0cd8-75c8-4e4f-eb9a-08d8f2ab8693 X-MS-TrafficTypeDiagnostic: MWHPR01MB2320: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:3968; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MW2PR0102MB3482.prod.exchangelabs.com; PTR:; CAT:NONE; SFS:(4636009)(396003)(366004)(136003)(346002)(376002)(39840400004)(7416002)(107886003)(921005)(86362001)(110136005)(6486002)(8676002)(52116002)(4326008)(8936002)(6512007)(66946007)(2906002)(956004)(5660300002)(2616005)(478600001)(26005)(6506007)(1076003)(83380400001)(54906003)(186003)(16526019)(6666004)(316002)(66476007)(66556008)(38100700001)(41533002); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: 949c0cd8-75c8-4e4f-eb9a-08d8f2ab8693 X-MS-Exchange-CrossTenant-AuthSource: MW2PR0102MB3482.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Mar 2021 12:09:38.7943 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 3pa7o7j7xMaw/nwUp0rQQxo6zefAuPG9jTPQNwlzfpPIw2u+0eeJTccwrlV9WWFprNDRNjqyMwoTP3a863Lgc6mvnRCE+NyF4RLNWtw/8HI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR01MB2320 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Expose the PEC calculation i2c_smbus_pec() for generic use. Signed-off-by: Quan Nguyen --- drivers/i2c/i2c-core-smbus.c | 12 ++++++++++-- include/linux/i2c.h | 1 + 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c index d2d32c0fd8c3..e5b2d1465e7e 100644 --- a/drivers/i2c/i2c-core-smbus.c +++ b/drivers/i2c/i2c-core-smbus.c @@ -37,8 +37,15 @@ static u8 crc8(u16 data) return (u8)(data >> 8); } -/* Incremental CRC8 over count bytes in the array pointed to by p */ -static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) +/** + * i2c_smbus_pec - Incremental CRC8 over the given input data array + * @crc: previous return crc8 value + * @p: pointer to data buffer. + * @count: number of bytes in data buffer. + * + * Incremental CRC8 over count bytes in the array pointed to by p + */ +u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) { int i; @@ -46,6 +53,7 @@ static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) crc = crc8((crc ^ p[i]) << 8); return crc; } +EXPORT_SYMBOL(i2c_smbus_pec); /* Assume a 7-bit address, which is reasonable for SMBus */ static u8 i2c_smbus_msg_pec(u8 pec, struct i2c_msg *msg) diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 56622658b215..0d75e5bcdde6 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -144,6 +144,7 @@ s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, /* Now follow the 'nice' access routines. These also document the calling conventions of i2c_smbus_xfer. */ +u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count); s32 i2c_smbus_read_byte(const struct i2c_client *client); s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); s32 i2c_smbus_read_byte_data(const struct i2c_client *client, u8 command);