wip

system/sensord/sensors/i2c_sensor.cc

@@ -0,0 +1,50 @@
+#include "system/sensord/sensors/i2c_sensor.h"
+
+int16_t read_12_bit(uint8_t lsb, uint8_t msb) {
+  uint16_t combined = (uint16_t(msb) << 8) | uint16_t(lsb & 0xF0);
+  return int16_t(combined) / (1 << 4);
+}
+
+int16_t read_16_bit(uint8_t lsb, uint8_t msb) {
+  uint16_t combined = (uint16_t(msb) << 8) | uint16_t(lsb);
+  return int16_t(combined);
+}
+
+int32_t read_20_bit(uint8_t b2, uint8_t b1, uint8_t b0) {
+  uint32_t combined = (uint32_t(b0) << 16) | (uint32_t(b1) << 8) | uint32_t(b2);
+  return int32_t(combined) / (1 << 4);
+}
+
+I2CSensor::I2CSensor(I2CBus *bus, int gpio_nr, bool shared_gpio) :
+  bus(bus), gpio_nr(gpio_nr), shared_gpio(shared_gpio) {}
+
+I2CSensor::~I2CSensor() {
+  if (gpio_fd != -1) {
+    close(gpio_fd);
+  }
+}
+
+int I2CSensor::read_register(uint register_address, uint8_t *buffer, uint8_t len) {
+  return bus->read_register(get_device_address(), register_address, buffer, len);
+}
+
+int I2CSensor::set_register(uint register_address, uint8_t data) {
+  return bus->set_register(get_device_address(), register_address, data);
+}
+
+int I2CSensor::init_gpio() {
+  if (shared_gpio || gpio_nr == 0) {
+    return 0;
+  }
+
+  gpio_fd = gpiochip_get_ro_value_fd("sensord", GPIOCHIP_INT, gpio_nr);
+  if (gpio_fd < 0) {
+    return -1;
+  }
+
+  return 0;
+}
+
+bool I2CSensor::has_interrupt_enabled() {
+  return gpio_nr != 0;
+}