Add CST816 touchscreen driver (#5941)

* Add CST816 touchscreen

esphome/components/cst816/touchscreen/__init__.py

@@ -0,0 +1,34 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+
+from esphome import pins
+from esphome.components import i2c, touchscreen
+from esphome.const import CONF_INTERRUPT_PIN, CONF_ID, CONF_RESET_PIN
+from .. import cst816_ns
+
+
+CST816Touchscreen = cst816_ns.class_(
+    "CST816Touchscreen",
+    touchscreen.Touchscreen,
+    i2c.I2CDevice,
+)
+
+CST816ButtonListener = cst816_ns.class_("CST816ButtonListener")
+CONFIG_SCHEMA = touchscreen.TOUCHSCREEN_SCHEMA.extend(
+    {
+        cv.GenerateID(): cv.declare_id(CST816Touchscreen),
+        cv.Optional(CONF_INTERRUPT_PIN): pins.internal_gpio_input_pin_schema,
+        cv.Optional(CONF_RESET_PIN): pins.gpio_output_pin_schema,
+    }
+).extend(i2c.i2c_device_schema(0x15))
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await touchscreen.register_touchscreen(var, config)
+    await i2c.register_i2c_device(var, config)
+
+    if interrupt_pin := config.get(CONF_INTERRUPT_PIN):
+        cg.add(var.set_interrupt_pin(await cg.gpio_pin_expression(interrupt_pin)))
+    if reset_pin := config.get(CONF_RESET_PIN):
+        cg.add(var.set_reset_pin(await cg.gpio_pin_expression(reset_pin)))