Add rc522 i2c (#1432)

* split to spi and i2c

* fix binary_sensor

* i2c comms ready

* fix rc522_spi binary sensor compat

* lint

* lint

* add test and codeowners

* fix refactor

esphome/components/rc522/__init__.py

@@ -0,0 +1,38 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome import automation, pins
+from esphome.components import i2c
+from esphome.const import CONF_ON_TAG, CONF_TRIGGER_ID, CONF_RESET_PIN
+from esphome.core import coroutine
+
+CODEOWNERS = ['@glmnet']
+AUTO_LOAD = ['binary_sensor']
+MULTI_CONF = True
+
+CONF_RC522_ID = 'rc522_id'
+
+rc522_ns = cg.esphome_ns.namespace('rc522')
+RC522 = rc522_ns.class_('RC522', cg.PollingComponent, i2c.I2CDevice)
+RC522Trigger = rc522_ns.class_('RC522Trigger', automation.Trigger.template(cg.std_string))
+
+RC522_SCHEMA = cv.Schema({
+    cv.GenerateID(): cv.declare_id(RC522),
+    cv.Optional(CONF_RESET_PIN): pins.gpio_output_pin_schema,
+    cv.Optional(CONF_ON_TAG): automation.validate_automation({
+        cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(RC522Trigger),
+    }),
+}).extend(cv.polling_component_schema('1s'))
+
+
+@coroutine
+def setup_rc522(var, config):
+    yield cg.register_component(var, config)
+
+    if CONF_RESET_PIN in config:
+        reset = yield cg.gpio_pin_expression(config[CONF_RESET_PIN])
+        cg.add(var.set_reset_pin(reset))
+
+    for conf in config.get(CONF_ON_TAG, []):
+        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID])
+        cg.add(var.register_trigger(trigger))
+        yield automation.build_automation(trigger, [(cg.std_string, 'x')], conf)