diff --git a/API.md b/API.md
index 352c087eb..db9e103ec 100644
--- a/API.md
+++ b/API.md
@@ -243,6 +243,7 @@ Optional:
     "serial": ["/dev/xy"],
     "input": ["Input device name"],
     "disk": ["/dev/sdax"],
+    "gpio": ["gpiochip0", "gpiochip100"],
     "audio": {
         "CARD_ID": {
             "name": "xy",
diff --git a/hassio/api/host.py b/hassio/api/host.py
index 5815ebf76..5087e6837 100644
--- a/hassio/api/host.py
+++ b/hassio/api/host.py
@@ -8,7 +8,7 @@ from .util import api_process_hostcontrol, api_process, api_validate
 from ..const import (
     ATTR_VERSION, ATTR_LAST_VERSION, ATTR_TYPE, ATTR_HOSTNAME, ATTR_FEATURES,
     ATTR_OS, ATTR_SERIAL, ATTR_INPUT, ATTR_DISK, ATTR_AUDIO, ATTR_AUDIO_INPUT,
-    ATTR_AUDIO_OUTPUT)
+    ATTR_AUDIO_OUTPUT, ATTR_GPIO)
 from ..validate import ALSA_CHANNEL
 
 _LOGGER = logging.getLogger(__name__)
@@ -83,8 +83,9 @@ class APIHost(object):
     async def hardware(self, request):
         """Return local hardware infos."""
         return {
-            ATTR_SERIAL: self.local_hw.serial_devices,
-            ATTR_INPUT: self.local_hw.input_devices,
-            ATTR_DISK: self.local_hw.disk_devices,
+            ATTR_SERIAL: list(self.local_hw.serial_devices),
+            ATTR_INPUT: list(self.local_hw.input_devices),
+            ATTR_DISK: list(self.local_hw.disk_devices),
+            ATTR_GPIO: list(self.local_hw.gpio_devices),
             ATTR_AUDIO: self.local_hw.audio_devices,
         }
diff --git a/hassio/hardware.py b/hassio/hardware.py
index eddfc6f39..09be04acc 100644
--- a/hassio/hardware.py
+++ b/hassio/hardware.py
@@ -19,6 +19,8 @@ RE_DEVICES = re.compile(r"\[.*(\d+)- (\d+).*\]: ([\w ]*)")
 PROC_STAT = Path("/proc/stat")
 RE_BOOT_TIME = re.compile(r"btime (\d+)")
 
+GPIO_DEVICES = Path("/sys/class/gpio")
+
 
 class Hardware(object):
     """Represent a interface to procfs, sysfs and udev."""
@@ -35,7 +37,7 @@ class Hardware(object):
             if 'ID_VENDOR' in device:
                 dev_list.add(device.device_node)
 
-        return list(dev_list)
+        return dev_list
 
     @property
     def input_devices(self):
@@ -45,7 +47,7 @@ class Hardware(object):
             if 'NAME' in device:
                 dev_list.add(device['NAME'].replace('"', ''))
 
-        return list(dev_list)
+        return dev_list
 
     @property
     def disk_devices(self):
@@ -55,7 +57,7 @@ class Hardware(object):
             if device.device_node.startswith('/dev/sd'):
                 dev_list.add(device.device_node)
 
-        return list(dev_list)
+        return dev_list
 
     @property
     def audio_devices(self):
@@ -90,6 +92,15 @@ class Hardware(object):
 
         return audio_list
 
+    @property
+    def gpio_devices(self):
+        """Return list of GPIO interface on device."""
+        dev_list = set()
+        for interface in GPIO_DEVICES.glob("gpio*"):
+            dev_list.add(interface.name)
+
+        return dev_list
+
     @property
     def last_boot(self):
         """Return last boot time."""