aboutsummaryrefslogtreecommitdiff
path: root/nuttx/drivers/sensors/lm75.c
diff options
context:
space:
mode:
Diffstat (limited to 'nuttx/drivers/sensors/lm75.c')
-rw-r--r--nuttx/drivers/sensors/lm75.c537
1 files changed, 0 insertions, 537 deletions
diff --git a/nuttx/drivers/sensors/lm75.c b/nuttx/drivers/sensors/lm75.c
deleted file mode 100644
index 2d3346447..000000000
--- a/nuttx/drivers/sensors/lm75.c
+++ /dev/null
@@ -1,537 +0,0 @@
-/****************************************************************************
- * drivers/sensors/lm75.c
- * Character driver for the STMicro LM-75 Temperature Sensor
- *
- * Copyright (C) 2011 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.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-
-#include <stdlib.h>
-#include <fixedmath.h>
-#include <errno.h>
-#include <debug.h>
-
-#include <nuttx/fs/fs.h>
-#include <nuttx/i2c.h>
-#include <nuttx/sensors/lm75.h>
-
-#if defined(CONFIG_I2C) && defined(CONFIG_I2C_LM75)
-
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/* Centigrade to Fahrenheit conversion: F = 9*C/5 + 32 */
-
-#define B16_9DIV5 (9 * 65536 / 5)
-#define B16_32 (32 * 65536)
-
-/* Debug for this file only */
-
-#ifdef CONFIG_DEBUG_LM75
-# define lm75dbg dbg
-#else
-# ifdef CONFIG_CPP_HAVE_VARARGS
-# define lm75dbg(x...)
-# else
-# define lm75dbg (void)
-# endif
-#endif
-
-/****************************************************************************
- * Private
- ****************************************************************************/
-
-struct lm75_dev_s
-{
- FAR struct i2c_dev_s *i2c; /* I2C interface */
- uint8_t addr; /* I2C address */
- bool fahrenheit; /* true: temperature will be reported in fahrenheit */
-};
-
-/****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
-/* I2C Helpers */
-
-static int lm75_readb16(FAR struct lm75_dev_s *priv, uint8_t regaddr,
- FAR b16_t *regvalue);
-static int lm75_writeb16(FAR struct lm75_dev_s *priv, uint8_t regaddr,
- b16_t regval);
-static int lm75_readtemp(FAR struct lm75_dev_s *priv, FAR b16_t *temp);
-static int lm75_readconf(FAR struct lm75_dev_s *priv, FAR uint8_t *conf);
-static int lm75_writeconf(FAR struct lm75_dev_s *priv, uint8_t conf);
-
-/* Character driver methods */
-
-static int lm75_open(FAR struct file *filep);
-static int lm75_close(FAR struct file *filep);
-static ssize_t lm75_read(FAR struct file *, FAR char *, size_t);
-static ssize_t lm75_write(FAR struct file *filep, FAR const char *buffer, size_t buflen);
-static int lm75_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-
-static const struct file_operations g_lm75fops =
-{
- lm75_open,
- lm75_close,
- lm75_read,
- lm75_write,
- 0,
- lm75_ioctl
-#ifndef CONFIG_DISABLE_POLL
- , 0
-#endif
-};
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-/****************************************************************************
- * Name: lm75_readb16
- *
- * Description:
- * Read a 16-bit register (LM75_TEMP_REG, LM75_THYS_REG, or LM75_TOS_REG)
- *
- ****************************************************************************/
-
-static int lm75_readb16(FAR struct lm75_dev_s *priv, uint8_t regaddr,
- FAR b16_t *regvalue)
-{
- uint8_t buffer[2];
- int ret;
-
- /* Write the register address */
-
- I2C_SETADDRESS(priv->i2c, priv->addr, 7);
- ret = I2C_WRITE(priv->i2c, &regaddr, 1);
- if (ret < 0)
- {
- lm75dbg("I2C_WRITE failed: %d\n", ret);
- return ret;
- }
-
- /* Restart and read 16-bits from the register (discarding 7) */
-
- ret = I2C_READ(priv->i2c, buffer, 2);
- if (ret < 0)
- {
- lm75dbg("I2C_READ failed: %d\n", ret);
- return ret;
- }
-
- /* Data format is: TTTTTTTT Txxxxxxx where TTTTTTTTT is a nine-bit,
- * signed temperature value with LSB = 0.5 degrees centigrade. So the
- * raw data is b8_t
- */
-
- *regvalue = b8tob16((b8_t)buffer[0] << 8 | (b8_t)buffer[1]);
- lm75dbg("addr: %02x value: %08x ret: %d\n", regaddr, *regvalue, ret);
- return OK;
-}
-
-/****************************************************************************
- * Name: lm75_writeb16
- *
- * Description:
- * Write to a 16-bit register (LM75_TEMP_REG, LM75_THYS_REG, or LM75_TOS_REG)
- *
- ****************************************************************************/
-
-static int lm75_writeb16(FAR struct lm75_dev_s *priv, uint8_t regaddr,
- b16_t regval)
-{
- uint8_t buffer[3];
- b8_t regb8;
-
- lm75dbg("addr: %02x value: %08x\n", regaddr, regval);
-
- /* Set up a 3 byte message to send */
-
- buffer[0] = regaddr;
-
- regb8 = b16tob8(regval);
- buffer[1] = (uint8_t)(regb8 >> 8);
- buffer[2] = (uint8_t)regb8;
-
- /* Write the register address followed by the data (no RESTART) */
-
- I2C_SETADDRESS(priv->i2c, priv->addr, 7);
- return I2C_WRITE(priv->i2c, buffer, 3);
-}
-
-/****************************************************************************
- * Name: lm75_readtemp
- *
- * Description:
- * Read the temperature register with special scaling (LM75_TEMP_REG)
- *
- ****************************************************************************/
-
-static int lm75_readtemp(FAR struct lm75_dev_s *priv, FAR b16_t *temp)
-{
- b16_t temp16;
- int ret;
-
- /* Read the raw temperature data (b16_t) */
-
- ret = lm75_readb16(priv, LM75_TEMP_REG, &temp16);
- if (ret < 0)
- {
- lm75dbg("lm75_readb16 failed: %d\n", ret);
- return ret;
- }
- lm75dbg("Centigrade: %08x\n", temp16);
-
- /* Was fahrenheit requested? */
-
- if (priv->fahrenheit)
- {
- /* Centigrade to Fahrenheit conversion: F = 9*C/5 + 32 */
-
- temp16 = b16mulb16(temp16, B16_9DIV5) + B16_32;
- lm75dbg("Fahrenheit: %08x\n", temp16);
- }
-
- *temp = temp16;
- return OK;
-}
-
-/****************************************************************************
- * Name: lm75_readconf
- *
- * Description:
- * Read the 8-bit LM75 configuration register
- *
- ****************************************************************************/
-
-static int lm75_readconf(FAR struct lm75_dev_s *priv, FAR uint8_t *conf)
-{
- uint8_t buffer;
- int ret;
-
- /* Write the configuration register address */
-
- I2C_SETADDRESS(priv->i2c, priv->addr, 7);
-
- buffer = LM75_CONF_REG;
- ret = I2C_WRITE(priv->i2c, &buffer, 1);
- if (ret < 0)
- {
- lm75dbg("I2C_WRITE failed: %d\n", ret);
- return ret;
- }
-
- /* Restart and read 8-bits from the register */
-
- ret = I2C_READ(priv->i2c, conf, 1);
- lm75dbg("conf: %02x ret: %d\n", *conf, ret);
- return ret;
-}
-
-/****************************************************************************
- * Name: lm75_writeconf
- *
- * Description:
- * Write to a 8-bit LM75 configuration register.
- *
- ****************************************************************************/
-
-static int lm75_writeconf(FAR struct lm75_dev_s *priv, uint8_t conf)
-{
- uint8_t buffer[2];
-
- lm75dbg("conf: %02x\n", conf);
-
- /* Set up a 2 byte message to send */
-
- buffer[0] = LM75_CONF_REG;
- buffer[1] = conf;
-
- /* Write the register address followed by the data (no RESTART) */
-
- I2C_SETADDRESS(priv->i2c, priv->addr, 7);
- return I2C_WRITE(priv->i2c, buffer, 2);
-}
-
-/****************************************************************************
- * Name: lm75_open
- *
- * Description:
- * This function is called whenever the LM-75 device is opened.
- *
- ****************************************************************************/
-
-static int lm75_open(FAR struct file *filep)
-{
- return OK;
-}
-
-/****************************************************************************
- * Name: lm75_close
- *
- * Description:
- * This routine is called when the LM-75 device is closed.
- *
- ****************************************************************************/
-
-static int lm75_close(FAR struct file *filep)
-{
- return OK;
-}
-
-/****************************************************************************
- * Name: lm75_read
- ****************************************************************************/
-
-static ssize_t lm75_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
-{
- FAR struct inode *inode = filep->f_inode;
- FAR struct lm75_dev_s *priv = inode->i_private;
- FAR b16_t *ptr;
- ssize_t nsamples;
- int i;
- int ret;
-
- /* How many samples were requested to get? */
-
- nsamples = buflen / sizeof(b16_t);
- ptr = (FAR b16_t *)buffer;
-
- lm75dbg("buflen: %d nsamples: %d\n", buflen, nsamples);
-
- /* Get the requested number of samples */
-
- for (i = 0; i < nsamples; i++)
- {
- b16_t temp;
-
- /* Read the next b16_t temperature value */
-
- ret = lm75_readtemp(priv, &temp);
- if (ret < 0)
- {
- lm75dbg("lm75_readtemp failed: %d\n",ret);
- return (ssize_t)ret;
- }
-
- /* Save the temperature value in the user buffer */
-
- *ptr++ = temp;
- }
-
- return nsamples * sizeof(b16_t);
-}
-
-/****************************************************************************
- * Name: lm75_write
- ****************************************************************************/
-
-static ssize_t lm75_write(FAR struct file *filep, FAR const char *buffer,
- size_t buflen)
-{
- return -ENOSYS;
-}
-
-/****************************************************************************
- * Name: lm75_ioctl
- ****************************************************************************/
-
-static int lm75_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
-{
- FAR struct inode *inode = filep->f_inode;
- FAR struct lm75_dev_s *priv = inode->i_private;
- int ret = OK;
-
- switch (cmd)
- {
- /* Read from the configuration register. Arg: uint8_t* pointer */
-
- case SNIOC_READCONF:
- {
- FAR uint8_t *ptr = (FAR uint8_t *)((uintptr_t)arg);
- ret = lm75_readconf(priv, ptr);
- lm75dbg("conf: %02x ret: %d\n", *ptr, ret);
- }
- break;
-
- /* Wrtie to the configuration register. Arg: uint8_t value */
-
- case SNIOC_WRITECONF:
- ret = lm75_writeconf(priv, (uint8_t)arg);
- lm75dbg("conf: %02x ret: %d\n", *(uint8_t*)arg, ret);
- break;
-
- /* Shutdown the LM75, Arg: None */
-
- case SNIOC_SHUTDOWN:
- {
- uint8_t conf;
- ret = lm75_readconf(priv, &conf);
- if (ret == OK)
- {
- ret = lm75_writeconf(priv, conf | LM75_CONF_SHUTDOWN);
- }
- lm75dbg("conf: %02x ret: %d\n", conf | LM75_CONF_SHUTDOWN, ret);
- }
- break;
-
- /* Powerup the LM75, Arg: None */
-
- case SNIOC_POWERUP:
- {
- uint8_t conf;
- ret = lm75_readconf(priv, &conf);
- if (ret == OK)
- {
- ret = lm75_writeconf(priv, conf & ~LM75_CONF_SHUTDOWN);
- }
- lm75dbg("conf: %02x ret: %d\n", conf & ~LM75_CONF_SHUTDOWN, ret);
- }
- break;
-
- /* Report samples in Fahrenheit */
-
- case SNIOC_FAHRENHEIT:
- priv->fahrenheit = true;
- lm75dbg("Fahrenheit\n");
- break;
-
- /* Report Samples in Centigrade */
-
- case SNIOC_CENTIGRADE:
- priv->fahrenheit = false;
- lm75dbg("Centigrade\n");
- break;
-
- /* Read THYS temperature register. Arg: b16_t* pointer */
-
- case SNIOC_READTHYS:
- {
- FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg);
- ret = lm75_readb16(priv, LM75_THYS_REG, ptr);
- lm75dbg("THYS: %08x ret: %d\n", *ptr, ret);
- }
- break;
-
- /* Write THYS temperature register. Arg: b16_t value */
-
- case SNIOC_WRITETHYS:
- ret = lm75_writeb16(priv, LM75_THYS_REG, (b16_t)arg);
- lm75dbg("THYS: %08x ret: %d\n", (b16_t)arg, ret);
- break;
-
- /* Read TOS (Over-temp Shutdown Threshold) Register. Arg: b16_t* pointer */
-
- case SNIOC_READTOS:
- {
- FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg);
- ret = lm75_readb16(priv, LM75_TOS_REG, ptr);
- lm75dbg("TOS: %08x ret: %d\n", *ptr, ret);
- }
- break;
-
- /* Write TOS (Over-temp Shutdown Threshold) Register. Arg: b16_t value */
-
- case SNIOC_WRITRETOS:
- ret = lm75_writeb16(priv, LM75_TOS_REG, (b16_t)arg);
- lm75dbg("TOS: %08x ret: %d\n", (b16_t)arg, ret);
- break;
-
- default:
- lm75dbg("Unrecognized cmd: %d\n", cmd);
- ret = -ENOTTY;
- break;
- }
-
- return ret;
-}
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * 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.
- *
- ****************************************************************************/
-
-int lm75_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c, uint8_t addr)
-{
- FAR struct lm75_dev_s *priv;
- int ret;
-
- /* Initialize the LM-75 device structure */
-
- priv = (FAR struct lm75_dev_s *)malloc(sizeof(struct lm75_dev_s));
- if (!priv)
- {
- lm75dbg("Failed to allocate instance\n");
- return -ENOMEM;
- }
-
- priv->i2c = i2c;
- priv->addr = addr;
- priv->fahrenheit = false;
-
- /* Register the character driver */
-
- ret = register_driver(devpath, &g_lm75fops, 0666, priv);
- if (ret < 0)
- {
- lm75dbg("Failed to register driver: %d\n", ret);
- free(priv);
- }
- return ret;
-}
-#endif /* CONFIG_I2C && CONFIG_I2C_LM75 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-24 21:26:58 +0000