driver:gpio: Get input status from PI4IO

The driver didn't support the reading of the input status yet.

BCS 746-001155

drivers/staging/gpio/gpio-pi4ioe5v6408.c

@@ -111,7 +111,16 @@ static int pi4io_gpio_get(struct gpio_chip *chip, unsigned offset)
 	struct pi4io_priv *pi4io = gpiochip_get_data(chip);
 	struct device *dev = &pi4io->i2c->dev;
 
-	ret = regmap_read(pi4io->regmap, PI4IO_OUTPUT, &out);
+	ret = pi4io_gpio_get_direction(chip, offset);
+
+	if (ret == GPIOF_DIR_IN) {
+		ret = regmap_read(pi4io->regmap, PI4IO_INPUT_STATUS, &out);
+	} else if(ret == GPIOF_DIR_OUT) {
+		ret = regmap_read(pi4io->regmap, PI4IO_OUTPUT, &out);
+	} else {
+		return ret;
+	}
+
 	if (ret) {
 		dev_err(dev, "Failed to read output: %d", ret);
 		return ret;