- printf("gpio: pin %s (gpio %i) value is %lu\n",
- str_gpio, gpio, value);
+ printf("gpio: pin %s (gpio %u) value is ", str_gpio, gpio);
+
+ if (IS_ERR_VALUE(value)) {
+ printf("unknown (ret=%d)\n", value);
+ goto err;
+ } else {
+ printf("%d\n", value);
+ }
+
+ if (sub_cmd != GPIOC_INPUT && !IS_ERR_VALUE(value)) {
+ int nval = gpio_get_value(gpio);
+
+ if (IS_ERR_VALUE(nval)) {
+ printf(" Warning: no access to GPIO output value\n");
+ goto err;
+ } else if (nval != value) {
+ printf(" Warning: value of pin is still %d\n", nval);
+ goto err;
+ }
+ }