[sx1509] Output open drain pin mode (#6788)

esphome/components/sx1509/__init__.py

@@ -11,6 +11,7 @@ from esphome.const import (
     CONF_OUTPUT,
     CONF_PULLDOWN,
     CONF_PULLUP,
+    CONF_OPEN_DRAIN,
 )
 
 CONF_KEYPAD = "keypad"
@@ -79,6 +80,8 @@ def validate_mode(value):
         raise cv.Invalid("Pulldown only available with input")
     if value[CONF_PULLUP] and value[CONF_PULLDOWN]:
         raise cv.Invalid("Can only have one of pullup or pulldown")
+    if value[CONF_OPEN_DRAIN] and not value[CONF_OUTPUT]:
+        raise cv.Invalid("Open drain available only with output")
     return value
 
 
@@ -94,6 +97,7 @@ SX1509_PIN_SCHEMA = cv.All(
                 cv.Optional(CONF_PULLUP, default=False): cv.boolean,
                 cv.Optional(CONF_PULLDOWN, default=False): cv.boolean,
                 cv.Optional(CONF_OUTPUT, default=False): cv.boolean,
+                cv.Optional(CONF_OPEN_DRAIN, default=False): cv.boolean,
             },
             validate_mode,
         ),

esphome/components/sx1509/sx1509.cpp

@@ -86,33 +86,63 @@ void SX1509Component::digital_write(uint8_t pin, bool bit_value) {
 }
 
 void SX1509Component::pin_mode(uint8_t pin, gpio::Flags flags) {
+  ESP_LOGI(TAG, "Configuring pin %u with flags %x", pin, flags);
+
+  uint16_t temp_word = 0;
+
   this->read_byte_16(REG_DIR_B, &this->ddr_mask_);
-  if (flags == gpio::FLAG_OUTPUT) {
+  if (flags & gpio::FLAG_OUTPUT) {
+    // Always disable input buffer
+    this->read_byte_16(REG_INPUT_DISABLE_B, &temp_word);
+    temp_word |= (1 << pin);
+    this->write_byte_16(REG_INPUT_DISABLE_B, temp_word);
+
+    if (flags & gpio::FLAG_OPEN_DRAIN) {
+      // Pullup must be disabled for open drain mode
+      this->read_byte_16(REG_PULL_UP_B, &temp_word);
+      temp_word &= ~(1 << pin);
+      this->write_byte_16(REG_PULL_UP_B, temp_word);
+      this->read_byte_16(REG_OPEN_DRAIN_B, &temp_word);
+      temp_word |= (1 << pin);
+      this->write_byte_16(REG_OPEN_DRAIN_B, temp_word);
+      ESP_LOGD(TAG, "Open drain output mode set for %u", pin);
+    } else {
+      ESP_LOGD(TAG, "Output Mode for %u", pin);
+    }
+
+    // Set direction to output
     this->ddr_mask_ &= ~(1 << pin);
-  } else {
-    this->ddr_mask_ |= (1 << pin);
-
-    uint16_t temp_pullup;
-    this->read_byte_16(REG_PULL_UP_B, &temp_pullup);
-    uint16_t temp_pulldown;
-    this->read_byte_16(REG_PULL_DOWN_B, &temp_pulldown);
-
-    if (flags & gpio::FLAG_PULLUP) {
-      temp_pullup |= (1 << pin);
-    } else {
-      temp_pullup &= ~(1 << pin);
-    }
-
-    if (flags & gpio::FLAG_PULLDOWN) {
-      temp_pulldown |= (1 << pin);
-    } else {
-      temp_pulldown &= ~(1 << pin);
-    }
-
-    this->write_byte_16(REG_PULL_UP_B, temp_pullup);
-    this->write_byte_16(REG_PULL_DOWN_B, temp_pulldown);
-  }
     this->write_byte_16(REG_DIR_B, this->ddr_mask_);
+  } else {
+    ESP_LOGD(TAG, "Input Mode for %u", pin);
+
+    // Always enable input buffer
+    this->read_byte_16(REG_INPUT_DISABLE_B, &temp_word);
+    temp_word &= ~(1 << pin);
+    this->write_byte_16(REG_INPUT_DISABLE_B, temp_word);
+
+    // Pullup
+    this->read_byte_16(REG_PULL_UP_B, &temp_word);
+    if (flags & gpio::FLAG_PULLUP) {
+      temp_word |= (1 << pin);
+    } else {
+      temp_word &= ~(1 << pin);
+    }
+    this->write_byte_16(REG_PULL_UP_B, temp_word);
+
+    // Pulldown
+    this->read_byte_16(REG_PULL_DOWN_B, &temp_word);
+    if (flags & gpio::FLAG_PULLDOWN) {
+      temp_word |= (1 << pin);
+    } else {
+      temp_word &= ~(1 << pin);
+    }
+    this->write_byte_16(REG_PULL_DOWN_B, temp_word);
+
+    // Set direction to input
+    this->ddr_mask_ |= (1 << pin);
+    this->write_byte_16(REG_DIR_B, this->ddr_mask_);
+  }
 }
 
 void SX1509Component::setup_led_driver(uint8_t pin) {

tests/components/sx1509/test.esp32-c3-idf.yaml

@@ -13,3 +13,21 @@ binary_sensor:
     pin:
       sx1509: sx1509_hub
       number: 3
+
+switch:
+  - platform: gpio
+    name: GPIO SX1509 Test Out Open Drain
+    pin:
+      sx1509: sx1509_hub
+      number: 0
+      mode:
+        output: true
+        open_drain: true
+
+  - platform: gpio
+    name: GPIO SX1509 Test Out Standard
+    pin:
+      sx1509: sx1509_hub
+      number: 1
+      mode:
+        output: true

tests/components/sx1509/test.esp32-c3.yaml

@@ -13,3 +13,21 @@ binary_sensor:
     pin:
       sx1509: sx1509_hub
       number: 3
+
+switch:
+  - platform: gpio
+    name: GPIO SX1509 Test Out Open Drain
+    pin:
+      sx1509: sx1509_hub
+      number: 0
+      mode:
+        output: true
+        open_drain: true
+
+  - platform: gpio
+    name: GPIO SX1509 Test Out Standard
+    pin:
+      sx1509: sx1509_hub
+      number: 1
+      mode:
+        output: true

tests/components/sx1509/test.esp32-idf.yaml

@@ -13,3 +13,21 @@ binary_sensor:
     pin:
       sx1509: sx1509_hub
       number: 3
+
+switch:
+  - platform: gpio
+    name: GPIO SX1509 Test Out Open Drain
+    pin:
+      sx1509: sx1509_hub
+      number: 0
+      mode:
+        output: true
+        open_drain: true
+
+  - platform: gpio
+    name: GPIO SX1509 Test Out Standard
+    pin:
+      sx1509: sx1509_hub
+      number: 1
+      mode:
+        output: true

tests/components/sx1509/test.esp32.yaml

@@ -13,3 +13,21 @@ binary_sensor:
     pin:
       sx1509: sx1509_hub
       number: 3
+
+switch:
+  - platform: gpio
+    name: GPIO SX1509 Test Out Open Drain
+    pin:
+      sx1509: sx1509_hub
+      number: 0
+      mode:
+        output: true
+        open_drain: true
+
+  - platform: gpio
+    name: GPIO SX1509 Test Out Standard
+    pin:
+      sx1509: sx1509_hub
+      number: 1
+      mode:
+        output: true

tests/components/sx1509/test.esp8266.yaml

@@ -13,3 +13,21 @@ binary_sensor:
     pin:
       sx1509: sx1509_hub
       number: 3
+
+switch:
+  - platform: gpio
+    name: GPIO SX1509 Test Out Open Drain
+    pin:
+      sx1509: sx1509_hub
+      number: 0
+      mode:
+        output: true
+        open_drain: true
+
+  - platform: gpio
+    name: GPIO SX1509 Test Out Standard
+    pin:
+      sx1509: sx1509_hub
+      number: 1
+      mode:
+        output: true

tests/components/sx1509/test.rp2040.yaml

@@ -13,3 +13,21 @@ binary_sensor:
     pin:
       sx1509: sx1509_hub
       number: 3
+
+switch:
+  - platform: gpio
+    name: GPIO SX1509 Test Out Open Drain
+    pin:
+      sx1509: sx1509_hub
+      number: 0
+      mode:
+        output: true
+        open_drain: true
+
+  - platform: gpio
+    name: GPIO SX1509 Test Out Standard
+    pin:
+      sx1509: sx1509_hub
+      number: 1
+      mode:
+        output: true