Fix gpio validation for esp32 variants (#2609)

Co-authored-by: Otto Winter <otto@otto-winter.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/esp32/gpio_esp32.py

@@ -0,0 +1,77 @@
+import logging
+
+from esphome.const import (
+    CONF_INPUT,
+    CONF_MODE,
+    CONF_NUMBER,
+    CONF_OUTPUT,
+    CONF_PULLDOWN,
+    CONF_PULLUP,
+)
+import esphome.config_validation as cv
+
+
+_ESP_SDIO_PINS = {
+    6: "Flash Clock",
+    7: "Flash Data 0",
+    8: "Flash Data 1",
+    11: "Flash Command",
+}
+
+_ESP32_STRAPPING_PINS = {0, 2, 4, 15}
+_LOGGER = logging.getLogger(__name__)
+
+
+def esp32_validate_gpio_pin(value):
+    if value < 0 or value > 39:
+        raise cv.Invalid(f"Invalid pin number: {value} (must be 0-39)")
+    if value in _ESP_SDIO_PINS:
+        raise cv.Invalid(
+            f"This pin cannot be used on ESP32s and is already used by the flash interface (function: {_ESP_SDIO_PINS[value]})"
+        )
+    if 9 <= value <= 10:
+        _LOGGER.warning(
+            "Pin %s (9-10) might already be used by the "
+            "flash interface in QUAD IO flash mode.",
+            value,
+        )
+    if value in _ESP32_STRAPPING_PINS:
+        _LOGGER.warning(
+            "GPIO%d is a Strapping PIN and should be avoided.\n"
+            "Attaching external pullup/down resistors to strapping pins can cause unexpected failures.\n"
+            "See https://esphome.io/guides/faq.html#why-am-i-getting-a-warning-about-strapping-pins",
+            value,
+        )
+    if value in (20, 24, 28, 29, 30, 31):
+        # These pins are not exposed in GPIO mux (reason unknown)
+        # but they're missing from IO_MUX list in datasheet
+        raise cv.Invalid(f"The pin GPIO{value} is not usable on ESP32s.")
+    return value
+
+
+def esp32_validate_supports(value):
+    num = value[CONF_NUMBER]
+    mode = value[CONF_MODE]
+    is_input = mode[CONF_INPUT]
+    is_output = mode[CONF_OUTPUT]
+    is_pullup = mode[CONF_PULLUP]
+    is_pulldown = mode[CONF_PULLDOWN]
+
+    if is_input:
+        # All ESP32 pins support input mode
+        pass
+    if is_output and 34 <= num <= 39:
+        raise cv.Invalid(
+            f"GPIO{num} (34-39) does not support output pin mode.",
+            [CONF_MODE, CONF_OUTPUT],
+        )
+    if is_pullup and 34 <= num <= 39:
+        raise cv.Invalid(
+            f"GPIO{num} (34-39) does not support pullups.", [CONF_MODE, CONF_PULLUP]
+        )
+    if is_pulldown and 34 <= num <= 39:
+        raise cv.Invalid(
+            f"GPIO{num} (34-39) does not support pulldowns.", [CONF_MODE, CONF_PULLDOWN]
+        )
+
+    return value