Add support for matrix keypads (#4241)

Co-authored-by: Samuel Sieb <samuel@sieb.net>

esphome/components/matrix_keypad/matrix_keypad.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "esphome/components/key_provider/key_provider.h"
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/helpers.h"
+#include <cstdlib>
+#include <utility>
+
+namespace esphome {
+namespace matrix_keypad {
+
+class MatrixKeypadListener {
+ public:
+  virtual void button_pressed(int row, int col){};
+  virtual void button_released(int row, int col){};
+  virtual void key_pressed(uint8_t key){};
+  virtual void key_released(uint8_t key){};
+};
+
+class MatrixKeypad : public key_provider::KeyProvider, public Component {
+ public:
+  void setup() override;
+  void loop() override;
+  void dump_config() override;
+  void set_columns(std::vector<GPIOPin *> pins) { columns_ = std::move(pins); };
+  void set_rows(std::vector<GPIOPin *> pins) { rows_ = std::move(pins); };
+  void set_keys(std::string keys) { keys_ = std::move(keys); };
+  void set_debounce_time(int debounce_time) { debounce_time_ = debounce_time; };
+  void set_has_diodes(int has_diodes) { has_diodes_ = has_diodes; };
+
+  void register_listener(MatrixKeypadListener *listener);
+
+ protected:
+  std::vector<GPIOPin *> rows_;
+  std::vector<GPIOPin *> columns_;
+  std::string keys_;
+  int debounce_time_ = 0;
+  bool has_diodes_{false};
+  int pressed_key_ = -1;
+
+  std::vector<MatrixKeypadListener *> listeners_{};
+};
+
+}  // namespace matrix_keypad
+}  // namespace esphome