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[82.242.157.225]) by smtp.gmail.com with ESMTPSA id t5sm7151832wjm.12.2016.09.08.03.48.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 08 Sep 2016 03:48:30 -0700 (PDT) From: Bartosz Golaszewski To: Linus Walleij , Alexandre Courbot , Andy Shevchenko , Vignesh R , Yong Li , Geert Uytterhoeven Cc: linux-gpio , LKML , Bartosz Golaszewski Subject: [PATCH v5 3/6] gpio: pca953x: refactor pca953x_read_regs() Date: Thu, 8 Sep 2016 12:48:19 +0200 Message-Id: <1473331702-26711-4-git-send-email-bgolaszewski@baylibre.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1473331702-26711-1-git-send-email-bgolaszewski@baylibre.com> References: <1473331702-26711-1-git-send-email-bgolaszewski@baylibre.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Avoid the unnecessary if-else in pca953x_read_regs() by spltting the routine into smaller, specialized functions and calling the right one via a function pointer held in struct pca953x. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andy Shevchenko --- drivers/gpio/gpio-pca953x.c | 49 ++++++++++++++++++++++++++++++++------------- 1 file changed, 35 insertions(+), 14 deletions(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 9870a34..4c46cc8 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -135,6 +135,7 @@ struct pca953x_chip { const struct pca953x_reg_config *regs; int (*write_regs)(struct pca953x_chip *, int, u8 *); + int (*read_regs)(struct pca953x_chip *, int, u8 *); }; static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val, @@ -220,24 +221,41 @@ static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) return 0; } -static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val) +static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val) { int ret; - if (chip->gpio_chip.ngpio <= 8) { - ret = i2c_smbus_read_byte_data(chip->client, reg); - *val = ret; - } else if (chip->gpio_chip.ngpio >= 24) { - int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); + ret = i2c_smbus_read_byte_data(chip->client, reg); + *val = ret; - ret = i2c_smbus_read_i2c_block_data(chip->client, - (reg << bank_shift) | REG_ADDR_AI, - NBANK(chip), val); - } else { - ret = i2c_smbus_read_word_data(chip->client, reg << 1); - val[0] = (u16)ret & 0xFF; - val[1] = (u16)ret >> 8; - } + return ret; +} + +static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val) +{ + int ret; + + ret = i2c_smbus_read_word_data(chip->client, reg << 1); + val[0] = (u16)ret & 0xFF; + val[1] = (u16)ret >> 8; + + return ret; +} + +static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val) +{ + int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); + + return i2c_smbus_read_i2c_block_data(chip->client, + (reg << bank_shift) | REG_ADDR_AI, + NBANK(chip), val); +} + +static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val) +{ + int ret; + + ret = chip->read_regs(chip, reg, val); if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n"); return ret; @@ -764,13 +782,16 @@ static int pca953x_probe(struct i2c_client *client, if (chip->gpio_chip.ngpio <= 8) { chip->write_regs = pca953x_write_regs_8; + chip->read_regs = pca953x_read_regs_8; } else if (chip->gpio_chip.ngpio >= 24) { chip->write_regs = pca953x_write_regs_24; + chip->read_regs = pca953x_read_regs_24; } else { if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) chip->write_regs = pca953x_write_regs_16; else chip->write_regs = pca957x_write_regs_16; + chip->read_regs = pca953x_read_regs_16; } if (chip->chip_type == PCA953X_TYPE)