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gpio: pca953x: refactor pca953x_write_regs()
Avoid the unnecessary if-else in pca953x_write_regs() by splitting the routine into smaller, specialized functions and calling the right one via a function pointer held in struct pca953x_chip. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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parent
53661f3bc6
commit
7acc66e371
1 changed files with 47 additions and 28 deletions
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@ -135,6 +135,8 @@ struct pca953x_chip {
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struct regulator *regulator;
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const struct pca953x_reg_config *regs;
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int (*write_regs)(struct pca953x_chip *, int, u8 *);
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};
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static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
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@ -174,38 +176,44 @@ static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
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return 0;
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}
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static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
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{
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return i2c_smbus_write_byte_data(chip->client, reg, *val);
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}
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static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
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{
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__le16 word = cpu_to_le16(get_unaligned((u16 *)val));
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return i2c_smbus_write_word_data(chip->client,
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reg << 1, (__force u16)word);
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}
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static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]);
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if (ret < 0)
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return ret;
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return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]);
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}
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static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
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{
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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return i2c_smbus_write_i2c_block_data(chip->client,
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(reg << bank_shift) | REG_ADDR_AI,
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NBANK(chip), val);
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}
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static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
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{
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int ret = 0;
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if (chip->gpio_chip.ngpio <= 8)
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ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
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else if (chip->gpio_chip.ngpio >= 24) {
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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ret = i2c_smbus_write_i2c_block_data(chip->client,
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(reg << bank_shift) | REG_ADDR_AI,
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NBANK(chip), val);
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} else {
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switch (chip->chip_type) {
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case PCA953X_TYPE: {
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__le16 word = cpu_to_le16(get_unaligned((u16 *)val));
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ret = i2c_smbus_write_word_data(chip->client, reg << 1,
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(__force u16)word);
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break;
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}
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case PCA957X_TYPE:
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ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
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val[0]);
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if (ret < 0)
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break;
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ret = i2c_smbus_write_byte_data(chip->client,
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(reg << 1) + 1,
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val[1]);
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break;
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}
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}
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ret = chip->write_regs(chip, reg, val);
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed writing register\n");
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return ret;
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@ -774,6 +782,17 @@ static int pca953x_probe(struct i2c_client *client,
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*/
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pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
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if (chip->gpio_chip.ngpio <= 8) {
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chip->write_regs = pca953x_write_regs_8;
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} else if (chip->gpio_chip.ngpio >= 24) {
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chip->write_regs = pca953x_write_regs_24;
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} else {
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if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
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chip->write_regs = pca953x_write_regs_16;
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else
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chip->write_regs = pca957x_write_regs_16;
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}
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if (chip->chip_type == PCA953X_TYPE)
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ret = device_pca953x_init(chip, invert);
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else
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