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drivers: gpio_pca95xx: add pins initialization to default state

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After a non-power reset (wdt) pins may remain in non-default state.
To ensure that a system initialization is the same after any reset,
it is necessary to initialize pins to the default state.

Signed-off-by: Mikhail Siomin <victorovich.01@mail.ru>
This commit is contained in:
Mikhail Siomin 2024-12-13 16:41:56 +03:00 committed by Benjamin Cabé
parent 417868665b
commit 36bbd67653
1 changed files with 27 additions and 2 deletions
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29
drivers/gpio/gpio_pca95xx.c
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@ -301,6 +301,15 @@ static inline int update_direction_reg(const struct device *dev, uint8_t pin,
&drv_data->reg_cache.dir, value);
}
static inline int update_direction_regs(const struct device *dev, uint16_t value)
{
struct gpio_pca95xx_drv_data * const drv_data =
(struct gpio_pca95xx_drv_data * const)dev->data;
return write_port_regs(dev, REG_CONF_PORT0,
&drv_data->reg_cache.dir, value);
}
static inline int update_pul_sel_reg(const struct device *dev, uint8_t pin,
uint16_t value)
{
@ -374,6 +383,18 @@ static int setup_pin_dir(const struct device *dev, uint32_t pin, int flags)
return ret;
}
/**
* @brief Initialize pins to default state
*
* @param dev Device struct of the PCA95XX
*
* @return 0 if successful, failed otherwise
*/
static int init_pins(const struct device *dev)
{
return update_direction_regs(dev, 0xFFFF);
}
/**
* @brief Setup the pin pull up/pull down status
*
@ -783,6 +804,7 @@ static int gpio_pca95xx_init(const struct device *dev)
const struct gpio_pca95xx_config * const config = dev->config;
struct gpio_pca95xx_drv_data * const drv_data =
(struct gpio_pca95xx_drv_data * const)dev->data;
int ret;
if (!device_is_ready(config->bus.bus)) {
return -ENODEV;
@ -790,11 +812,14 @@ static int gpio_pca95xx_init(const struct device *dev)
k_sem_init(&drv_data->lock, 1, 1);
ret = init_pins(dev);
if (ret != 0) {
return ret;
}
#ifdef CONFIG_GPIO_PCA95XX_INTERRUPT
/* Check if GPIO port supports interrupts */
if ((config->capabilities & PCA_HAS_INTERRUPT) != 0) {
int ret;
/* Store self-reference for interrupt handling */
drv_data->instance = dev;