Add support to map devicetree into add-on (#519)

* Add support to map devicetree into add-on

* Update const.py

* Update validate.py

* Update addon.py

* Update addons.py

* Update API.md

API.md

@@ -462,6 +462,7 @@ Get all available addons.
     "stdin": "bool",
     "webui": "null|http(s)://[HOST]:port/xy/zx",
     "gpio": "bool",
+    "devicetree": "bool",
     "audio": "bool",
     "audio_input": "null|0,0",
     "audio_output": "null|0,0",

hassio/addons/addon.py

@@ -25,7 +25,8 @@ from ..const import (
     ATTR_HASSIO_API, ATTR_AUDIO, ATTR_AUDIO_OUTPUT, ATTR_AUDIO_INPUT,
     ATTR_GPIO, ATTR_HOMEASSISTANT_API, ATTR_STDIN, ATTR_LEGACY, ATTR_HOST_IPC,
     ATTR_HOST_DBUS, ATTR_AUTO_UART, ATTR_DISCOVERY, ATTR_SERVICES,
-    ATTR_APPARMOR, SECURITY_PROFILE, SECURITY_DISABLE, SECURITY_DEFAULT)
+    ATTR_APPARMOR, ATTR_DEVICETREE, SECURITY_PROFILE, SECURITY_DISABLE,
+    SECURITY_DEFAULT)
 from ..coresys import CoreSysAttributes
 from ..docker.addon import DockerAddon
 from ..utils.json import write_json_file, read_json_file
@@ -354,6 +355,11 @@ class Addon(CoreSysAttributes):
         """Return True if the add-on access to gpio interface."""
         return self._mesh[ATTR_GPIO]
 
+    @property
+    def with_devicetree(self):
+        """Return True if the add-on read access to devicetree."""
+        return self._mesh[ATTR_DEVICETREE]
+
     @property
     def with_audio(self):
         """Return True if the add-on access to audio."""

hassio/addons/validate.py

@@ -18,7 +18,7 @@ from ..const import (
     ATTR_AUDIO_OUTPUT, ATTR_HASSIO_API, ATTR_BUILD_FROM, ATTR_SQUASH,
     ATTR_ARGS, ATTR_GPIO, ATTR_HOMEASSISTANT_API, ATTR_STDIN, ATTR_LEGACY,
     ATTR_HOST_DBUS, ATTR_AUTO_UART, ATTR_SERVICES, ATTR_DISCOVERY,
-    ATTR_APPARMOR)
+    ATTR_APPARMOR, ATTR_DEVICETREE)
 from ..validate import NETWORK_PORT, DOCKER_PORTS, ALSA_DEVICE
 
 _LOGGER = logging.getLogger(__name__)
@@ -111,6 +111,7 @@ SCHEMA_ADDON_CONFIG = vol.Schema({
     vol.Optional(ATTR_APPARMOR, default=True): vol.Boolean(),
     vol.Optional(ATTR_AUDIO, default=False): vol.Boolean(),
     vol.Optional(ATTR_GPIO, default=False): vol.Boolean(),
+    vol.Optional(ATTR_DEVICETREE, default=False): vol.Boolean(),
     vol.Optional(ATTR_HASSIO_API, default=False): vol.Boolean(),
     vol.Optional(ATTR_HOMEASSISTANT_API, default=False): vol.Boolean(),
     vol.Optional(ATTR_STDIN, default=False): vol.Boolean(),

hassio/api/addons.py

@@ -17,7 +17,7 @@ from ..const import (
     ATTR_CHANGELOG, ATTR_HOST_IPC, ATTR_HOST_DBUS, ATTR_LONG_DESCRIPTION,
     ATTR_CPU_PERCENT, ATTR_MEMORY_LIMIT, ATTR_MEMORY_USAGE, ATTR_NETWORK_TX,
     ATTR_NETWORK_RX, ATTR_BLK_READ, ATTR_BLK_WRITE, ATTR_ICON, ATTR_SERVICES,
-    ATTR_DISCOVERY, ATTR_APPARMOR,
+    ATTR_DISCOVERY, ATTR_APPARMOR, ATTR_DEVICETREE,
     CONTENT_TYPE_PNG, CONTENT_TYPE_BINARY, CONTENT_TYPE_TEXT)
 from ..coresys import CoreSysAttributes
 from ..validate import DOCKER_PORTS, ALSA_DEVICE
@@ -136,6 +136,7 @@ class APIAddons(CoreSysAttributes):
             ATTR_HASSIO_API: addon.access_hassio_api,
             ATTR_HOMEASSISTANT_API: addon.access_homeassistant_api,
             ATTR_GPIO: addon.with_gpio,
+            ATTR_DEVICETREE: addon.with_devicetree,
             ATTR_AUDIO: addon.with_audio,
             ATTR_AUDIO_INPUT: addon.audio_input,
             ATTR_AUDIO_OUTPUT: addon.audio_output,

hassio/const.py

@@ -165,6 +165,7 @@ ATTR_CRYPTO = 'crypto'
 ATTR_BRANCH = 'branch'
 ATTR_KERNEL = 'kernel'
 ATTR_APPARMOR = 'apparmor'
+ATTR_DEVICETREE = 'devicetree'
 
 SERVICE_MQTT = 'mqtt'
 

hassio/docker/addon.py

@@ -201,6 +201,8 @@ class DockerAddon(DockerInterface):
                 }})
 
         # Init other hardware mappings
+
+        # GPIO support
         if self.addon.with_gpio:
             volumes.update({
                 "/sys/class/gpio": {
@@ -211,6 +213,14 @@ class DockerAddon(DockerInterface):
                 },
             })
 
+        # DeviceTree support
+        if self.addon.with_devicetree:
+            volumes.update({
+                "/sys/firmware/devicetree": {
+                    'bind': "/sys/firmware/devicetree", 'mode': 'r'
+                },
+            })
+
         # Host dbus system
         if self.addon.host_dbus:
             volumes.update({