Commit 7acc66e3 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Linus Walleij

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: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 53661f3b
......@@ -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(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);
}
static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
__le16 word = cpu_to_le16(get_unaligned((u16 *)val));
if (chip->gpio_chip.ngpio <= 8)
ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
else if (chip->gpio_chip.ngpio >= 24) {
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);
ret = i2c_smbus_write_i2c_block_data(chip->client,
return 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;
}
}
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;
......@@ -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
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment