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[2a01:c22:6faa:ed00:b906:e23f:946b:b9f7]) by smtp.googlemail.com with ESMTPSA id e9-20020a17090618e900b006e8669f3941sm1827069ejf.209.2022.04.15.10.00.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Apr 2022 10:00:02 -0700 (PDT) Message-ID: Date: Fri, 15 Apr 2022 18:57:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: [PATCH 5/8] i2c: i801: add helper i801_set_hstadd() Content-Language: en-US From: Heiner Kallweit To: Jean Delvare Cc: "linux-i2c@vger.kernel.org" References: <4125f9ce-ce5f-fbcf-7d6f-9bc586ac43e0@gmail.com> In-Reply-To: <4125f9ce-ce5f-fbcf-7d6f-9bc586ac43e0@gmail.com> X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Factor out setting SMBHSTADD to a helper. The current code makes the assumption that constant I2C_SMBUS_READ has bit 0 set, that's not ideal. Therefore let the new helper explicitly check for I2C_SMBUS_READ. Signed-off-by: Heiner Kallweit --- drivers/i2c/busses/i2c-i801.c | 41 ++++++++++++++++++----------------- 1 file changed, 21 insertions(+), 20 deletions(-) diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index a9737f14d..bf77f8640 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -771,6 +771,14 @@ static int i801_block_transaction(struct i801_priv *priv, union i2c_smbus_data * return result; } +static void i801_set_hstadd(struct i801_priv *priv, u8 addr, char read_write) +{ + addr <<= 1; + if (read_write == I2C_SMBUS_READ) + addr |= 0x01; + outb_p(addr, SMBHSTADD(priv)); +} + /* Return negative errno on error. */ static s32 i801_access(struct i2c_adapter *adap, u16 addr, unsigned short flags, char read_write, u8 command, @@ -795,28 +803,24 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, switch (size) { case I2C_SMBUS_QUICK: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD(priv)); + i801_set_hstadd(priv, addr, read_write); xact = I801_QUICK; break; case I2C_SMBUS_BYTE: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD(priv)); + i801_set_hstadd(priv, addr, read_write); if (read_write == I2C_SMBUS_WRITE) outb_p(command, SMBHSTCMD(priv)); xact = I801_BYTE; break; case I2C_SMBUS_BYTE_DATA: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD(priv)); + i801_set_hstadd(priv, addr, read_write); outb_p(command, SMBHSTCMD(priv)); if (read_write == I2C_SMBUS_WRITE) outb_p(data->byte, SMBHSTDAT0(priv)); xact = I801_BYTE_DATA; break; case I2C_SMBUS_WORD_DATA: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD(priv)); + i801_set_hstadd(priv, addr, read_write); outb_p(command, SMBHSTCMD(priv)); if (read_write == I2C_SMBUS_WRITE) { outb_p(data->word & 0xff, SMBHSTDAT0(priv)); @@ -825,7 +829,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, xact = I801_WORD_DATA; break; case I2C_SMBUS_PROC_CALL: - outb_p((addr & 0x7f) << 1, SMBHSTADD(priv)); + i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE); outb_p(command, SMBHSTCMD(priv)); outb_p(data->word & 0xff, SMBHSTDAT0(priv)); outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv)); @@ -833,8 +837,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, read_write = I2C_SMBUS_READ; break; case I2C_SMBUS_BLOCK_DATA: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD(priv)); + i801_set_hstadd(priv, addr, read_write); outb_p(command, SMBHSTCMD(priv)); block = 1; break; @@ -845,10 +848,11 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, * However if SPD Write Disable is set (Lynx Point and later), * the read will fail if we don't set the R/#W bit. */ - outb_p(((addr & 0x7f) << 1) | - ((priv->original_hstcfg & SMBHSTCFG_SPD_WD) ? - (read_write & 0x01) : 0), - SMBHSTADD(priv)); + if (priv->original_hstcfg & SMBHSTCFG_SPD_WD) + i801_set_hstadd(priv, addr, read_write); + else + i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE); + if (read_write == I2C_SMBUS_READ) { /* NB: page 240 of ICH5 datasheet also shows * that DATA1 is the cmd field when reading */ @@ -858,11 +862,8 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, block = 1; break; case I2C_SMBUS_BLOCK_PROC_CALL: - /* - * Bit 0 of the slave address register always indicate a write - * command. - */ - outb_p((addr & 0x7f) << 1, SMBHSTADD(priv)); + /* Needs to be flagged as write transaction */ + i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE); outb_p(command, SMBHSTCMD(priv)); block = 1; break;