ti-tmp112.h

/*
 * Copyright (c) 2016-2017 Chris Johns <chrisj@rtems.org>
 * All rights reserved.
 *
 * 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.
 */

/*
 * TI TMP112
 *   http://www.ti.com/product/TMP112
 */

#ifndef TI_TMP112_H
#define TI_TMP112_H

#include <dev/i2c/i2c.h>

/*
 * Confirguration.
 */
#define TI_TMP112_CR_0_25Hz      (0 << 6)
#define TI_TMP112_CR_1Hz         (1 << 6)
#define TI_TMP112_CR_4Hz         (2 << 6)    /* default */
#define TI_TMP112_CR_8Hz         (3 << 6)
#define TI_TMP112_EM_NORMAL      (0 << 4)    /* default */
#define TI_TMP112_EM_EXTENDED    (1 << 4)
#define TI_TMP112_SD_ON          (0 << 8)    /* default */
#define TI_TMP112_SD_SHUTDOWN    (1 << 8)
#define TI_TMP112_TM_COMPARATOR  (0 << 9)    /* default */
#define TI_TMP112_TM_INTERRUPT   (1 << 9)
#define TI_TMP112_POL_ALERT_LOW  (0 << 10)   /* default */
#define TI_TMP112_POL_ALERT_HIGH (1 << 10)
#define TI_TMP112_FQL_1          (0 << 11)   /* default */
#define TI_TMP112_FQL_2          (1 << 11)
#define TI_TMP112_FQL_4          (2 << 11)
#define TI_TMP112_FQL_6          (3 << 11)

/*
 * IO control interface.
 */
#define TI_TMP112_GET_TEMP      (I2C_DEV_IO_CONTROL + 0)
#define TI_TMP112_GET_TEMP_RAW  (I2C_DEV_IO_CONTROL + 1)
#define TI_TMP112_SET_CONFIG    (I2C_DEV_IO_CONTROL + 2)
#define TI_TMP112_SET_LOW_TEMP  (I2C_DEV_IO_CONTROL + 3)
#define TI_TMP112_SET_HIGH_TEMP (I2C_DEV_IO_CONTROL + 4)

/*
 * Register the device.
 */
int i2c_dev_register_ti_tmp112(const char* bus_path,
                               const char* dev_path,
                               uint16_t    address);

/*
 * Get the temperature in degrees C x 10000. To print you would so:
 *
 *   printf("Temperature is %3d.%04d\n", temp / 10000, temp % 10000);
 *
 * If the device is shutdown a single conversion is made waiting for the
 * conversion to complete.
 */
static inline int
ti_tmp112_get_temperature(int fd, int* temp)
{
  return ioctl(fd, TI_TMP112_GET_TEMP, temp);
}

/*
 * Get the temperature as the raw register value.
 *
 * If the device is shutdown a single conversion is made waiting for the
 * conversion to complete.
 */
static inline int
ti_tmp112_get_temperature_raw(int fd, unsigned int* temp)
{
  return ioctl(fd, TI_TMP112_GET_TEMP_RAW, temp);
}

/*
 * Set the configuration.
 */
static inline int
ti_tmp112_adc_set_config(int fd, uint16_t config)
{
  return ioctl(fd, TI_TMP112_SET_CONFIG, (void *)(uintptr_t) config);
}

/*
 * Set the low temperature.
 */
static inline int
ti_tmp112_set_low_temperator(int fd, uint16_t temp)
{
  return ioctl(fd, TI_TMP112_SET_LOW_TEMP, (void *)(uintptr_t) temp);
}

/*
 * Set the high temperature.
 */
static inline int
ti_tmp112_adc_set_high_threshold(int fd, uint16_t level)
{
  return ioctl(fd, TI_TMP112_SET_HIGH_TEMP, (void *)(uintptr_t) level);
}

#endif