[nrf fromlist] drivers: serial: async_to_irq: API for error irq state

Add API which checks if error interrupt is enabled by the user
of the interrupt driven API.

Upstream PR: zephyrproject-rtos/zephyr#74643

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

drivers/serial/uart_async_to_irq.c

@@ -363,6 +363,13 @@ int uart_async_to_irq_rx_disable(const struct device *dev)
 	return 0;
 }
 
+bool uart_async_to_irq_err_enabled(const struct device *dev)
+{
+	struct uart_async_to_irq_data *data = get_data(dev);
+
+	return (data->flags & A2I_ERR_IRQ_ENABLED) ? true : false;
+}
+
 void uart_async_to_irq_trampoline_cb(const struct device *dev)
 {
 	struct uart_async_to_irq_data *data = get_data(dev);

include/zephyr/drivers/serial/uart_async_to_irq.h

@@ -137,6 +137,13 @@ int uart_async_to_irq_rx_enable(const struct device *dev);
  */
 int uart_async_to_irq_rx_disable(const struct device *dev);
 
+/** @brief Checking if error interrupt is enabled.
+ *
+ * @retval true if error interrupt is enabled.
+ * @retval false if error interrupt is not enabled.
+ */
+bool uart_async_to_irq_err_enabled(const struct device *dev);
+
 /* Starting from here API is internal only. */
 
 /** @cond INTERNAL_HIDDEN