Added LM92 temperature sensor.

drivers/sensors/Kconfig

@@ -79,6 +79,13 @@ config LM75
 		This should also work with compatible temperature sensors such as
 		the TI TMP100/101.
 
+config LM92
+  bool "TI LM92 Temperature Sensor support"
+  default n
+  select I2C
+  ---help---
+    Enable driver support for the TI LM92 Temperature Sensor.
+
 config QENCODER
 	bool "Qencoder"
 	default n

drivers/sensors/Make.defs

@@ -60,6 +60,10 @@ endif
 ifeq ($(CONFIG_I2C_LM75),y)
   CSRCS += lm75.c
 endif
+
+ifeq ($(CONFIG_LM92),y)
+  CSRCS += lm92.c
+endif
 endif # CONFIG_I2C
 
 # These drivers depend on SPI support

include/nuttx/sensors/lm92.h

@@ -0,0 +1,150 @@
+/****************************************************************************
+ * include/nuttx/sensors/lm92.h
+ *
+ *   Copyright (C) 2011-2012, 2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2015 Alexandru Duru. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *           Alexandru Duru <alexandruduru@gmail.com>
+ *
+ * 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 __INCLUDE_NUTTX_SENSORS_LM92_H
+#define __INCLUDE_NUTTX_SENSORS_LM92_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/fs/ioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************
+ * CONFIG_I2C - Enables support for I2C drivers
+ * CONFIG_LM92 - Enables support for the LM92 driver
+ */
+
+#define CONFIG_LM92_BASEADDR 0x48
+#define CONFIG_LM92_ADDR0 (CONFIG_LM92_BASEADDR + 0)
+#define CONFIG_LM92_ADDR1 (CONFIG_LM92_BASEADDR + 1)
+#define CONFIG_LM92_ADDR2 (CONFIG_LM92_BASEADDR + 2)
+#define CONFIG_LM92_ADDR3 (CONFIG_LM92_BASEADDR + 3)
+
+/* 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_READTCRIT    _SNIOC(0x0009) /* Arg: b16_t* pointer */
+#define SNIOC_WRITETCRIT   _SNIOC(0x000a) /* Arg: b16_t value */
+#define SNIOC_READTLOW     _SNIOC(0x000b) /* Arg: b16_t* pointer */
+#define SNIOC_WRITETLOW    _SNIOC(0x000c) /* Arg: b16_t value */
+#define SNIOC_READTHIGH    _SNIOC(0x000d) /* Arg: b16_t* pointer */
+#define SNIOC_WRITETHIGH   _SNIOC(0x000e) /* Arg: b16_t value */
+#define SNIOC_READID       _SNIOC(0x000f) /* Arg: uint16_t* pointer */
+
+/* LM92 Register Definitions ***********************************************/
+/* LM92 Register Addresses */
+
+#define LM92_TEMP_REG      0x00     /* Temperature Register */
+#define LM92_CONF_REG      0x01     /* Configuration Register */
+#define LM92_THYS_REG      0x02     /* Temperature Register */
+#define LM92_TCRIT_REG     0x03     /* Critical Temperature Register */
+#define LM92_TLOW_REG      0x04     /* Low Temperature Register */
+#define LM92_THIGH_REG     0x05     /* High Temperature Register */
+#define LM92_ID_REG        0x07     /* Manufacturer's Identification Register */
+
+/* Configuration Register Bit Definitions */
+
+#define LM92_CONF_SHUTDOWN      (1 << 0) /* Bit 0: Put LM92 goes in low power shutdown mode */
+#define LM92_CONF_INTMODE       (1 << 1) /* Bit 1: 0=Comparator 1=Interrupt mode */
+#define LM92_CONF_TCRITPOLARITY (1 << 2) /* Bit 2: 0=Active low 1=Active high */
+#define LM92_CONF_INTPOLARITY   (1 << 3) /* Bit 3: 0=Active low 1=Active high */
+#define LM92_CONF_FAULTQ        (1 << 4) /* Bit 4: 0=Disabled 1=Enabled */
+
+/* NOTE: When temperature values are read, they are returned as b16_t, fixed
+ * precision integer values (see include/fixedmath.h).
+ */
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: lm92_register
+ *
+ * Description:
+ *   Register the LM92 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 the LM92.
+ *   addr    - The I2C address of the LM92.  The base I2C address of the LM92
+ *             is 0x48.  Bits 0-2 can be controlled to get 4 unique addresses
+ *             from 0x48 through 0x4b.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int lm92_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c,
+                  uint8_t addr);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_NUTTX_SENSORS_LM92_H */