Add TT21100 touchscreen component (#4793)

Co-authored-by: Rajan Patel <rpatel3001@gmail.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/tt21100/touchscreen/tt21100.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/touchscreen/touchscreen.h"
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+
+namespace esphome {
+namespace tt21100 {
+
+using namespace touchscreen;
+
+struct TT21100TouchscreenStore {
+  volatile bool touch;
+  ISRInternalGPIOPin pin;
+
+  static void gpio_intr(TT21100TouchscreenStore *store);
+};
+
+class TT21100ButtonListener {
+ public:
+  virtual void update_button(uint8_t index, uint16_t state) = 0;
+};
+
+class TT21100Touchscreen : public Touchscreen, public Component, public i2c::I2CDevice {
+ public:
+  void setup() override;
+  void loop() override;
+  void dump_config() override;
+  float get_setup_priority() const override;
+
+  void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
+  void set_reset_pin(GPIOPin *pin) { this->reset_pin_ = pin; }
+
+  void register_button_listener(TT21100ButtonListener *listener) { this->button_listeners_.push_back(listener); }
+
+ protected:
+  void reset_();
+
+  TT21100TouchscreenStore store_;
+
+  InternalGPIOPin *interrupt_pin_;
+  GPIOPin *reset_pin_{nullptr};
+
+  std::vector<TT21100ButtonListener *> button_listeners_;
+};
+
+}  // namespace tt21100
+}  // namespace esphome