From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bartosz Golaszewski Subject: [PATCH 5/5] gpio: pca953x: refactor pca953x_read_regs() Date: Mon, 5 Sep 2016 16:31:35 +0200 Message-ID: <1473085895-31711-6-git-send-email-bgolaszewski@baylibre.com> References: <1473085895-31711-1-git-send-email-bgolaszewski@baylibre.com> Return-path: Received: from mail-wm0-f47.google.com ([74.125.82.47]:36165 "EHLO mail-wm0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754852AbcIEObt (ORCPT ); Mon, 5 Sep 2016 10:31:49 -0400 Received: by mail-wm0-f47.google.com with SMTP id b187so22473618wme.1 for ; Mon, 05 Sep 2016 07:31:48 -0700 (PDT) In-Reply-To: <1473085895-31711-1-git-send-email-bgolaszewski@baylibre.com> Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: Linus Walleij , Alexandre Courbot , Andy Shevchenko , Vignesh R , Yong Li , Geert Uytterhoeven Cc: linux-gpio , LKML , Bartosz Golaszewski 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 --- drivers/gpio/gpio-pca953x.c | 55 ++++++++++++++++++++++++++++++++------------- 1 file changed, 39 insertions(+), 16 deletions(-) diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 86676dd..0ddcbbc 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -134,6 +134,7 @@ struct pca953x_chip { struct pca953x_offset *offset; 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, @@ -219,24 +220,41 @@ 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; @@ -766,10 +784,15 @@ static int pca953x_probe(struct i2c_client *client, */ pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK); - if (chip->gpio_chip.ngpio <= 8) + if (chip->gpio_chip.ngpio <= 8) { chip->write_regs = pca953x_write_regs_8; - else if (chip->gpio_chip.ngpio >= 24) + 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 { + chip->read_regs = pca953x_read_regs_16; + } if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) ret = device_pca953x_init(chip, invert); -- 2.7.4