Add the option to have persistent switches (#266)

* Add the option to have persistent switches

* update README

* Make the same changes in the info.md file.

README.md

@@ -154,6 +154,7 @@ switch:
       - port: 11
         name: "Fan Office"
         unique_id: "fan_office_switch_port_11"
+        persistent: true
       - port: 12
         name: "Light Desk"
         unique_id: "light_desk_switch_port_12"
@@ -168,6 +169,7 @@ switch:
 | `name`         | yes      |         | string  | The name for the switch entity                                                                              |
 | `unique_id`    | no       |         | string  | An ID that uniquely identifies the switch. Set this to a unique value to allow customization through the UI |
 | `invert_logic` | no       | `false` | boolean | If true, inverts the output logic to ACTIVE LOW                                                             |
+| `persistent`   | no       | `false` | boolean | If true, the switch state will be persistent in HA and will be restored if HA restart / crash               |
 
 For more details about the GPIO layout, visit the Wikipedia [article](https://en.wikipedia.org/wiki/Raspberry_Pi#General_purpose_input-output_(GPIO)_connector) about the Raspberry Pi.
 

custom_components/rpi_gpio/switch.py

@@ -1,5 +1,6 @@
 """Allows to configure a switch using RPi GPIO."""
 from __future__ import annotations
+from typing import Any
 
 import voluptuous as vol
 
@@ -10,20 +11,24 @@ from homeassistant.const import (
     CONF_SWITCHES,
     CONF_UNIQUE_ID,
     DEVICE_DEFAULT_NAME,
+    STATE_ON,
 )
 from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.reload import setup_reload_service
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
+from homeassistant.helpers.restore_state import RestoreEntity
 
 from . import DOMAIN, PLATFORMS, setup_output, write_output
 
 CONF_PULL_MODE = "pull_mode"
 CONF_PORTS = "ports"
 CONF_INVERT_LOGIC = "invert_logic"
+CONF_PERSISTENT = "persistent"
 
 DEFAULT_INVERT_LOGIC = False
+DEFAULT_PERSISTENT = False
 
 _SWITCHES_LEGACY_SCHEMA = vol.Schema({cv.positive_int: cv.string})
 
@@ -32,6 +37,7 @@ _SWITCH_SCHEMA = vol.Schema(
         vol.Required(CONF_NAME): cv.string,
         vol.Required(CONF_PORT): cv.positive_int,
         vol.Optional(CONF_INVERT_LOGIC, default=DEFAULT_INVERT_LOGIC): cv.boolean,
+        vol.Optional(CONF_PERSISTENT, default=DEFAULT_PERSISTENT): cv.boolean,
         vol.Optional(CONF_UNIQUE_ID): cv.string,
     }
 )
@@ -45,6 +51,7 @@ PLATFORM_SCHEMA = vol.All(
                 cv.ensure_list, [_SWITCH_SCHEMA]
             ),
             vol.Optional(CONF_INVERT_LOGIC, default=DEFAULT_INVERT_LOGIC): cv.boolean,
+            vol.Optional(CONF_PERSISTENT, default=DEFAULT_PERSISTENT): cv.boolean,
         },
     ),
     cv.has_at_least_one_key(CONF_PORTS, CONF_SWITCHES),
@@ -65,6 +72,16 @@ def setup_platform(
     switches_conf = config.get(CONF_SWITCHES)
     if switches_conf is not None:
         for switch in switches_conf:
+            if switch[CONF_PERSISTENT]:
+                switches.append(
+                    PersistentRPiGPIOSwitch(
+                        switch[CONF_NAME],
+                        switch[CONF_PORT],
+                        switch[CONF_INVERT_LOGIC],
+                        switch.get(CONF_UNIQUE_ID),
+                    )
+                )
+            else:
                 switches.append(
                     RPiGPIOSwitch(
                         switch[CONF_NAME],
@@ -78,9 +95,13 @@ def setup_platform(
         return
 
     invert_logic = config[CONF_INVERT_LOGIC]
+    persistent = config[CONF_PERSISTENT]
 
     ports = config[CONF_PORTS]
     for port, name in ports.items():
+        if persistent:
+            switches.append(PersistentRPiGPIOSwitch(name, port, invert_logic))
+        else:
             switches.append(RPiGPIOSwitch(name, port, invert_logic))
 
     add_entities(switches)
@@ -89,7 +110,7 @@ def setup_platform(
 class RPiGPIOSwitch(SwitchEntity):
     """Representation of a Raspberry Pi GPIO."""
 
-    def __init__(self, name, port, invert_logic, unique_id=None):
+    def __init__(self, name, port, invert_logic, unique_id=None, skip_reset=False):
         """Initialize the pin."""
         self._attr_name = name or DEVICE_DEFAULT_NAME
         self._attr_unique_id = unique_id
@@ -98,21 +119,42 @@ class RPiGPIOSwitch(SwitchEntity):
         self._invert_logic = invert_logic
         self._state = False
         setup_output(self._port)
+        if not skip_reset:
             write_output(self._port, 1 if self._invert_logic else 0)
 
     @property
-    def is_on(self):
+    def is_on(self) -> bool | None:
         """Return true if device is on."""
         return self._state
 
-    def turn_on(self, **kwargs):
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn the device on."""
         write_output(self._port, 0 if self._invert_logic else 1)
         self._state = True
-        self.schedule_update_ha_state()
+        self.async_write_ha_state()
 
-    def turn_off(self, **kwargs):
+    async def async_turn_off(self, **kwargs: Any) -> None:
         """Turn the device off."""
         write_output(self._port, 1 if self._invert_logic else 0)
         self._state = False
-        self.schedule_update_ha_state()
+        self.async_write_ha_state()
+
+
+class PersistentRPiGPIOSwitch(RPiGPIOSwitch, RestoreEntity):
+    """Representation of a persistent Raspberry Pi GPIO."""
+
+    def __init__(self, name, port, invert_logic, unique_id=None):
+        """Initialize the pin."""
+        super().__init__(name, port, invert_logic, unique_id, True)
+
+    async def async_added_to_hass(self) -> None:
+        """Call when the switch is added to hass."""
+        await super().async_added_to_hass()
+        state = await self.async_get_last_state()
+        if not state:
+            return
+        self._state = True if state.state == STATE_ON else False
+        if self._state:
+            await self.async_turn_on()
+        else:
+            await self.async_turn_off()

info.md

@@ -142,6 +142,7 @@ switch:
       - port: 11
         name: "Fan Office"
         unique_id: "fan_office_switch_port_11"
+        persistent: true
       - port: 12
         name: "Light Desk"
         unique_id: "light_desk_switch_port_12"
@@ -156,6 +157,7 @@ switch:
 | `name`         | yes      |         | string  | The name for the switch entity                                                                              |
 | `unique_id`    | no       |         | string  | An ID that uniquely identifies the switch. Set this to a unique value to allow customization through the UI |
 | `invert_logic` | no       | `false` | boolean | If true, inverts the output logic to ACTIVE LOW                                                             |
+| `persistent`   | no       | `false` | boolean | If true, the switch state will be persistent in HA and will be restored if HA restart / crash               |
 
 For more details about the GPIO layout, visit the Wikipedia [article](https://en.wikipedia.org/wiki/Raspberry_Pi#General_purpose_input-output_(GPIO)_connector) about the Raspberry Pi.