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gpio: pca953x: refactor pca953x_write_regs()

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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>
This commit is contained in:
Bartosz Golaszewski 2016-09-09 11:17:35 +02:00 committed by Linus Walleij
parent 53661f3bc6
commit 7acc66e371
1 changed files with 47 additions and 28 deletions
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75
drivers/gpio/gpio-pca953x.c
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@ -135,6 +135,8 @@ struct pca953x_chip {
struct regulator *regulator;
const struct pca953x_reg_config *regs;
int (*write_regs)(struct pca953x_chip *, int, u8 *);
};
static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
@ -174,38 +176,44 @@ static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
return 0;
}
static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
{
return i2c_smbus_write_byte_data(chip->client, reg, *val);
}
static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
__le16 word = cpu_to_le16(get_unaligned((u16 *)val));
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;
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));
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;
}
}
ret = chip->write_regs(chip, reg, val);
if (ret < 0) {
dev_err(&chip->client->dev, "failed writing register\n");
return ret;
@ -774,6 +782,17 @@ 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;
} 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;
}
if (chip->chip_type == PCA953X_TYPE)
ret = device_pca953x_init(chip, invert);
else