Add adc128s102 sensor (#3822)

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

esphome/components/adc128s102/adc128s102.cpp

@@ -0,0 +1,35 @@
+#include "adc128s102.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace adc128s102 {
+
+static const char *const TAG = "adc128s102";
+
+float ADC128S102::get_setup_priority() const { return setup_priority::HARDWARE; }
+
+void ADC128S102::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up adc128s102");
+  this->spi_setup();
+}
+
+void ADC128S102::dump_config() {
+  ESP_LOGCONFIG(TAG, "ADC128S102:");
+  LOG_PIN("  CS Pin:", this->cs_);
+}
+
+uint16_t ADC128S102::read_data(uint8_t channel) {
+  uint8_t control = channel << 3;
+
+  this->enable();
+  uint8_t adc_primary_byte = this->transfer_byte(control);
+  uint8_t adc_secondary_byte = this->transfer_byte(0x00);
+  this->disable();
+
+  uint16_t digital_value = adc_primary_byte << 8 | adc_secondary_byte;
+
+  return digital_value;
+}
+
+}  // namespace adc128s102
+}  // namespace esphome