i2c: Add temperature sensor LM75A driver

Close #3163.
2026-09-21 04:51:15 +08:00 · 2017-10-02 13:40:46 +02:00
parent 9c063df3ab
commit 4cfce5cb64
4 changed files with 329 additions and 0 deletions
@@ -0,0 +1,125 @@
+/**
+ * @file
+ *
+ * @brief Temperature Sensor LM75A Driver API
+ *
+ * @ingroup I2CSensorLM75A
+ */
+
+/*
+ * Copyright (c) 2017 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _DEV_I2C_SENSOR_LM75A_H
+#define _DEV_I2C_SENSOR_LM75A_H
+
+#include <dev/i2c/i2c.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @defgroup I2CSensorLM75A Temperature Sensor LM75A Driver
+ *
+ * @ingroup I2CDevice
+ *
+ * @brief Driver for NXP or Texas Instruments LM75A temperature sensor.
+ *
+ * @{
+ */
+
+int i2c_dev_register_sensor_lm75a(
+  const char *bus_path,
+  const char *dev_path,
+  uint16_t address
+);
+
+typedef enum {
+  SENSOR_LM75A_GET_CONF = I2C_DEV_IO_CONTROL,
+  SENSOR_LM75A_SET_CONF,
+  SENSOR_LM75A_CLEAR_AND_SET_CONF,
+  SENSOR_LM75A_GET_TEMP,
+  SENSOR_LM75A_GET_TOS,
+  SENSOR_LM75A_SET_TOS,
+  SENSOR_LM75A_GET_THYST,
+  SENSOR_LM75A_SET_THYST
+} sensor_lm75a_command;
+
+static inline int sensor_lm75a_get_conf(int fd, uint8_t *val)
+{
+  return ioctl(fd, SENSOR_LM75A_GET_CONF, val);
+}
+
+static inline int sensor_lm75a_set_conf(int fd, uint8_t val)
+{
+  return ioctl(fd, SENSOR_LM75A_SET_CONF, (void *)(uintptr_t) val);
+}
+
+static inline int sensor_lm75a_clear_and_set_conf(
+  int fd,
+  uint8_t clear,
+  uint8_t set
+)
+{
+  uint16_t clear_and_set = (uint16_t) (((uint16_t) set << 8) | clear);
+
+  return ioctl(
+    fd,
+    SENSOR_LM75A_CLEAR_AND_SET_CONF,
+    (void *)(uintptr_t) clear_and_set
+  );
+}
+
+static inline int sensor_lm75a_get_temp(int fd, int16_t *val)
+{
+  return ioctl(fd, SENSOR_LM75A_GET_TEMP, val);
+}
+
+static inline int sensor_lm75a_get_temp_celsius(int fd, double *celsius)
+{
+  int rv;
+  int16_t val;
+
+  rv = ioctl(fd, SENSOR_LM75A_GET_TEMP, &val);
+  *celsius = (((int) val) >> 5) * 0.125;
+  return rv;
+}
+
+static inline int sensor_lm75a_get_tos(int fd, uint16_t *val)
+{
+  return ioctl(fd, SENSOR_LM75A_GET_TOS, val);
+}
+
+static inline int sensor_lm75a_set_tos(int fd, uint16_t val)
+{
+  return ioctl(fd, SENSOR_LM75A_SET_TOS, (void *)(uintptr_t) val);
+}
+
+static inline int sensor_lm75a_get_thyst(int fd, uint16_t *val)
+{
+  return ioctl(fd, SENSOR_LM75A_GET_THYST, val);
+}
+
+static inline int sensor_lm75a_set_thyst(int fd, uint16_t val)
+{
+  return ioctl(fd, SENSOR_LM75A_SET_THYST, (void *)(uintptr_t) val);
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* _DEV_I2C_SENSOR_LM75A_H */