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/****************************************************************************
* include/nuttx/lm75.h
*
* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __NUTTX_SENSORS_LM75_H
#define __NUTTX_SENSORS_LM75_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/fs/ioctl.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************
* CONFIG_I2C - Enables support for I2C drivers
* CONFIG_I2C_LM75 - Enables support for the LM-75 driver
*/
#define CONFIG_LM75_BASEADDR 0x48
/* IOCTL Commands ***********************************************************/
#define SNIOC_READCONF _SNIOC(0x0001) /* Arg: uint8_t* pointer */
#define SNIOC_WRITECONF _SNIOC(0x0002) /* Arg: uint8_t value */
#define SNIOC_SHUTDOWN _SNIOC(0x0003) /* Arg: None */
#define SNIOC_POWERUP _SNIOC(0x0004) /* Arg: None */
#define SNIOC_FAHRENHEIT _SNIOC(0x0005) /* Arg: None */
#define SNIOC_CENTIGRADE _SNIOC(0x0006) /* Arg: None */
#define SNIOC_READTHYS _SNIOC(0x0007) /* Arg: b16_t* pointer */
#define SNIOC_WRITETHYS _SNIOC(0x0008) /* Arg: b16_t value */
#define SNIOC_READTOS _SNIOC(0x0009) /* Arg: b16_t* pointer */
#define SNIOC_WRITRETOS _SNIOC(0x000a) /* Arg: b16_t value */
/* LM-75 Register Definitions ***********************************************/
/* LM-75 Registers addresses */
#define LM75_TEMP_REG 0x00 /* Temperature Register */
#define LM75_CONF_REG 0x01 /* Configuration Register */
#define LM75_THYS_REG 0x02 /* Temperature Register */
#define LM75_TOS_REG 0x03 /* Over-temp Shutdown Threshold Register */
/* Configuration Register Bit Definitions */
#define LM75_CONF_SHUTDOWN (1 << 0) /* Bit 0: Put LM75 goes in low power shutdown mode */
#define LM75_CONF_INTMODE (1 << 1) /* Bit 1: 0=Comparator 1=Interrupt mode */
#define LM75_CONF_POLARITY (1 << 2) /* Bit 2: 0=O.S. Active low 1=active high */
#define LM75_CONF_FAULTQ (3) /* Bits 3-4: # faults before setting O.S. */
/* NOTE: When temperature values are read, they are return as b16_t, fixed
* precision integer values (see include/fixedmath.h).
*/
/****************************************************************************
* Global Data
****************************************************************************/
/****************************************************************************
* Global Function Prototypes
****************************************************************************/
/****************************************************************************
* Global Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: lm75_register
*
* Description:
* Register the LM-75 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/temp0"
* i2c - An instance of the I2C interface to use to communicate with LM75
* addr - The I2C address of the LM-75. The base I2C address of the LM75
* is 0x48. Bits 0-3 can be controlled to get 8 unique addresses from 0x48
* through 0x4f.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
EXTERN int lm75_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c,
uint8_t addr);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __NUTTX_SENSORS_LM75_H */
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