Create GT911 Touchscreen component (#4027)

Co-authored-by: clydebarrow <2366188+clydebarrow@users.noreply.github.com>

esphome/components/gt911/binary_sensor/__init__.py

@@ -0,0 +1,31 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import binary_sensor
+from esphome.const import CONF_INDEX
+
+from .. import gt911_ns
+from ..touchscreen import GT911Touchscreen, GT911ButtonListener
+
+CONF_GT911_ID = "gt911_id"
+
+GT911Button = gt911_ns.class_(
+    "GT911Button",
+    binary_sensor.BinarySensor,
+    cg.Component,
+    GT911ButtonListener,
+    cg.Parented.template(GT911Touchscreen),
+)
+
+CONFIG_SCHEMA = binary_sensor.binary_sensor_schema(GT911Button).extend(
+    {
+        cv.GenerateID(CONF_GT911_ID): cv.use_id(GT911Touchscreen),
+        cv.Optional(CONF_INDEX, default=0): cv.int_range(min=0, max=3),
+    }
+)
+
+
+async def to_code(config):
+    var = await binary_sensor.new_binary_sensor(config)
+    await cg.register_component(var, config)
+    await cg.register_parented(var, config[CONF_GT911_ID])
+    cg.add(var.set_index(config[CONF_INDEX]))

esphome/components/gt911/binary_sensor/gt911_button.cpp

@@ -0,0 +1,27 @@
+#include "gt911_button.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace gt911 {
+
+static const char *const TAG = "GT911.binary_sensor";
+
+void GT911Button::setup() {
+  this->parent_->register_button_listener(this);
+  this->publish_initial_state(false);
+}
+
+void GT911Button::dump_config() {
+  LOG_BINARY_SENSOR("", "GT911 Button", this);
+  ESP_LOGCONFIG(TAG, "  Index: %u", this->index_);
+}
+
+void GT911Button::update_button(uint8_t index, bool state) {
+  if (index != this->index_)
+    return;
+
+  this->publish_state(state);
+}
+
+}  // namespace gt911
+}  // namespace esphome

esphome/components/gt911/binary_sensor/gt911_button.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "esphome/components/binary_sensor/binary_sensor.h"
+#include "esphome/components/gt911/touchscreen/gt911_touchscreen.h"
+#include "esphome/core/component.h"
+#include "esphome/core/helpers.h"
+
+namespace esphome {
+namespace gt911 {
+
+class GT911Button : public binary_sensor::BinarySensor,
+                    public Component,
+                    public GT911ButtonListener,
+                    public Parented<GT911Touchscreen> {
+ public:
+  void setup() override;
+  void dump_config() override;
+
+  void set_index(uint8_t index) { this->index_ = index; }
+
+  void update_button(uint8_t index, bool state) override;
+
+ protected:
+  uint8_t index_;
+};
+
+}  // namespace gt911
+}  // namespace esphome