#ifndef SERVO2350_DRIVERS_MULTIPLEXER_CD74HC4067_H_
#define SERVO2350_DRIVERS_MULTIPLEXER_CD74HC4067_H_

#include <stdint.h>

#include <zephyr/device.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Select one of the 16 multiplexed channels.
 *
 * @param dev      CD74HC4067 device instance.
 * @param channel  Channel number to route (0-15).
 *
 * @retval 0 If the channel was selected.
 * @retval -EINVAL If the channel number is out of range.
 * @retval -ENODEV If one of the selection GPIOs is not ready.
 * @retval other Negative errno value from the GPIO driver.
 */
int cd74hc4067_select_channel(const struct device *dev, uint8_t channel);

/**
 * @brief Enable the multiplexer output (drives the /EN pin low).
 *
 * If the instance does not provide an enable GPIO, this call is a no-op.
 *
 * @param dev CD74HC4067 device instance.
 *
 * @retval 0 On success.
 * @retval -ENODEV If the enable GPIO is not ready.
 * @retval negative errno on GPIO failures.
 */
int cd74hc4067_enable(const struct device *dev);

/**
 * @brief Disable the multiplexer output (drives the /EN pin high).
 *
 * @param dev CD74HC4067 device instance.
 *
 * @retval 0 On success.
 * @retval -ENOTSUP If the instance does not expose an enable GPIO.
 * @retval -ENODEV If the enable GPIO is not ready.
 * @retval negative errno on GPIO failures.
 */
int cd74hc4067_disable(const struct device *dev);

/**
 * @brief Return the last channel value written to the device.
 *
 * @param dev CD74HC4067 device instance.
 *
 * @return Channel number in the range [0, 15].
 */
uint8_t cd74hc4067_get_current_channel(const struct device *dev);

#ifdef __cplusplus
}
#endif

#endif /* SERVO2350_DRIVERS_MULTIPLEXER_CD74HC4067_H_ */

