From patchwork Mon Sep 5 14:31:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 75424 Delivered-To: patch@linaro.org Received: by 10.140.106.11 with SMTP id d11csp101931qgf; Mon, 5 Sep 2016 07:31:52 -0700 (PDT) X-Received: by 10.98.63.193 with SMTP id z62mr15086608pfj.131.1473085911887; Mon, 05 Sep 2016 07:31:51 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpio-pca953x.c | 75 ++++++++++++++++++++++++++++----------------- 1 file changed, 47 insertions(+), 28 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 17cba0a..b64a7bb 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -133,6 +133,8 @@ struct pca953x_chip { unsigned long driver_data; struct pca953x_offset *offset; + + int (*write_regs)(struct pca953x_chip *, int, u8 *); }; static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val, @@ -172,38 +174,44 @@ static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val, return 0; } -static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) +static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val) { - int ret = 0; + return i2c_smbus_write_byte_data(chip->client, reg, *val); +} - if (chip->gpio_chip.ngpio <= 8) - ret = i2c_smbus_write_byte_data(chip->client, reg, *val); - else if (chip->gpio_chip.ngpio >= 24) { - int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); - ret = i2c_smbus_write_i2c_block_data(chip->client, - (reg << bank_shift) | REG_ADDR_AI, - NBANK(chip), val); - } else { - switch (chip->chip_type) { - case PCA953X_TYPE: { - __le16 word = cpu_to_le16(get_unaligned((u16 *)val)); +static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val) +{ + __le16 word = cpu_to_le16(get_unaligned((u16 *)val)); - ret = i2c_smbus_write_word_data(chip->client, reg << 1, - (__force u16)word); - break; - } - case PCA957X_TYPE: - ret = i2c_smbus_write_byte_data(chip->client, reg << 1, - val[0]); - if (ret < 0) - break; - ret = i2c_smbus_write_byte_data(chip->client, - (reg << 1) + 1, - val[1]); - break; - } - } + return i2c_smbus_write_word_data(chip->client, + reg << 1, (__force u16)word); +} + +static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val) +{ + int ret; + ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]); + if (ret < 0) + return ret; + + return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]); +} + +static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val) +{ + int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); + + return i2c_smbus_write_i2c_block_data(chip->client, + (reg << bank_shift) | REG_ADDR_AI, + NBANK(chip), val); +} + +static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) +{ + int ret = 0; + + ret = chip->write_regs(chip, reg, val); if (ret < 0) { dev_err(&chip->client->dev, "failed writing register\n"); return ret; @@ -645,6 +653,9 @@ static int device_pca953x_init(struct pca953x_chip *chip, u32 invert) chip->offset = &pca953x_offsets; + if (!chip->write_regs) + chip->write_regs = pca953x_write_regs_16; + ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output); if (ret) goto out; @@ -672,6 +683,9 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert) chip->offset = &pca957x_offsets; + if (!chip->write_regs) + chip->write_regs = pca957x_write_regs_16; + ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output); if (ret) goto out; @@ -755,6 +769,11 @@ static int pca953x_probe(struct i2c_client *client, */ pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK); + if (chip->gpio_chip.ngpio <= 8) + chip->write_regs = pca953x_write_regs_8; + else if (chip->gpio_chip.ngpio >= 24) + chip->write_regs = pca953x_write_regs_24; + if (chip->chip_type == PCA953X_TYPE) ret = device_pca953x_init(chip, invert); else