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gpio: exar: unduplicate address and offset computation

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Provide and use helpers for calculating the register address and bit
offset instead of hand coding it in every function.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Bartosz Golaszewski 2020-09-30 10:20:10 +02:00
parent 0c2c7e1323
commit 696868d0a7
1 changed files with 28 additions and 12 deletions
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40
drivers/gpio/gpio-exar.c
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@ -33,6 +33,26 @@ struct exar_gpio_chip {
unsigned int first_pin;
};
static unsigned int
exar_offset_to_sel_addr(struct exar_gpio_chip *exar_gpio, unsigned int offset)
{
return (offset + exar_gpio->first_pin) / 8 ? EXAR_OFFSET_MPIOSEL_HI
: EXAR_OFFSET_MPIOSEL_LO;
}
static unsigned int
exar_offset_to_lvl_addr(struct exar_gpio_chip *exar_gpio, unsigned int offset)
{
return (offset + exar_gpio->first_pin) / 8 ? EXAR_OFFSET_MPIOLVL_HI
: EXAR_OFFSET_MPIOLVL_LO;
}
static unsigned int
exar_offset_to_bit(struct exar_gpio_chip *exar_gpio, unsigned int offset)
{
return (offset + exar_gpio->first_pin) % 8;
}
static void exar_update(struct gpio_chip *chip, unsigned int reg, int val,
unsigned int offset)
{
@ -52,9 +72,8 @@ static int exar_set_direction(struct gpio_chip *chip, int direction,
unsigned int offset)
{
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
unsigned int addr = exar_offset_to_sel_addr(exar_gpio, offset);
unsigned int bit = exar_offset_to_bit(exar_gpio, offset);
exar_update(chip, addr, direction, bit);
return 0;
@ -75,9 +94,8 @@ static int exar_get(struct gpio_chip *chip, unsigned int reg)
static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
{
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
unsigned int addr = exar_offset_to_sel_addr(exar_gpio, offset);
unsigned int bit = exar_offset_to_bit(exar_gpio, offset);
if (exar_get(chip, addr) & BIT(bit))
return GPIO_LINE_DIRECTION_IN;
@ -88,9 +106,8 @@ static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
{
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
unsigned int addr = exar_offset_to_lvl_addr(exar_gpio, offset);
unsigned int bit = exar_offset_to_bit(exar_gpio, offset);
return !!(exar_get(chip, addr) & BIT(bit));
}
@ -99,9 +116,8 @@ static void exar_set_value(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
unsigned int addr = exar_offset_to_lvl_addr(exar_gpio, offset);
unsigned int bit = exar_offset_to_bit(exar_gpio, offset);
exar_update(chip, addr, value, bit);
}