From f4b98f5e320800d1477602bf2a655e15ed661230 Mon Sep 17 00:00:00 2001
From: tracestep <16390082+tracestep@users.noreply.github.com>
Date: Sun, 30 Apr 2023 18:24:15 -0300
Subject: [PATCH] Power down PN532 before deep sleep (#4707)

---
 esphome/components/pn532/pn532.cpp | 25 +++++++++++++++++++++++++
 esphome/components/pn532/pn532.h   |  4 ++++
 2 files changed, 29 insertions(+)

diff --git a/esphome/components/pn532/pn532.cpp b/esphome/components/pn532/pn532.cpp
index dc831ef6e0..cc28d7078b 100644
--- a/esphome/components/pn532/pn532.cpp
+++ b/esphome/components/pn532/pn532.cpp
@@ -81,7 +81,32 @@ void PN532::setup() {
   this->turn_off_rf_();
 }
 
+bool PN532::powerdown() {
+  updates_enabled_ = false;
+  requested_read_ = false;
+  ESP_LOGI(TAG, "Powering down PN532");
+  if (!this->write_command_({PN532_COMMAND_POWERDOWN, 0b10100000})) {  // enable i2c,spi wakeup
+    ESP_LOGE(TAG, "Error writing powerdown command to PN532");
+    return false;
+  }
+  std::vector<uint8_t> response;
+  if (!this->read_response(PN532_COMMAND_POWERDOWN, response)) {
+    ESP_LOGE(TAG, "Error reading PN532 powerdown response");
+    return false;
+  }
+  if (response[0] != 0x00) {
+    ESP_LOGE(TAG, "Error on PN532 powerdown: %02x", response[0]);
+    return false;
+  }
+  ESP_LOGV(TAG, "Powerdown successful");
+  delay(1);
+  return true;
+}
+
 void PN532::update() {
+  if (!updates_enabled_)
+    return;
+
   for (auto *obj : this->binary_sensors_)
     obj->on_scan_end();
 
diff --git a/esphome/components/pn532/pn532.h b/esphome/components/pn532/pn532.h
index fee94a29b8..73b349e328 100644
--- a/esphome/components/pn532/pn532.h
+++ b/esphome/components/pn532/pn532.h
@@ -17,6 +17,7 @@ static const uint8_t PN532_COMMAND_SAMCONFIGURATION = 0x14;
 static const uint8_t PN532_COMMAND_RFCONFIGURATION = 0x32;
 static const uint8_t PN532_COMMAND_INDATAEXCHANGE = 0x40;
 static const uint8_t PN532_COMMAND_INLISTPASSIVETARGET = 0x4A;
+static const uint8_t PN532_COMMAND_POWERDOWN = 0x16;
 
 class PN532BinarySensor;
 
@@ -30,6 +31,7 @@ class PN532 : public PollingComponent {
   float get_setup_priority() const override;
 
   void loop() override;
+  void on_shutdown() override { powerdown(); }
 
   void register_tag(PN532BinarySensor *tag) { this->binary_sensors_.push_back(tag); }
   void register_ontag_trigger(nfc::NfcOnTagTrigger *trig) { this->triggers_ontag_.push_back(trig); }
@@ -45,6 +47,7 @@ class PN532 : public PollingComponent {
   void clean_mode();
   void format_mode();
   void write_mode(nfc::NdefMessage *message);
+  bool powerdown();
 
  protected:
   void turn_off_rf_();
@@ -79,6 +82,7 @@ class PN532 : public PollingComponent {
   bool write_mifare_ultralight_tag_(std::vector<uint8_t> &uid, nfc::NdefMessage *message);
   bool clean_mifare_ultralight_();
 
+  bool updates_enabled_{true};
   bool requested_read_{false};
   std::vector<PN532BinarySensor *> binary_sensors_;
   std::vector<nfc::NfcOnTagTrigger *> triggers_ontag_;