1 files changed, 208 insertions, 0 deletions
diff --git a/nuttx/drivers/power/max1704x.c b/nuttx/drivers/power/max1704x.c
new file mode 100644
index 000000000..bba53478a
--- /dev/null
+++ b/nuttx/drivers/power/max1704x.c
@@ -0,0 +1,208 @@
+/****************************************************************************
+ * drivers/power/max1704x.c
+ * Character driver for the STMicroMAX1704x Temperature Sensor
+ *
+ *   Copyright (C) 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+
+#if defined(CONFIG_I2C) && defined(CONFIG_I2C_MAX1704X)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private
+ ****************************************************************************/
+
+struct max1704x_dev_s
+{
+  FAR struct i2c_dev_s *i2c; /* I2C interface */
+  uint8_t addr;              /* I2C address */
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+/* I2C Helpers */
+
+/* Character driver methods */
+
+static int     max1704x_open(FAR struct file *filep);
+static int     max1704x_close(FAR struct file *filep);
+static ssize_t max1704x_read(FAR struct file *, FAR char *, size_t);
+static ssize_t max1704x_write(FAR struct file *filep, FAR const char *buffer, size_t buflen);
+static int     max1704x_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct file_operations g_max1704xfopg =
+{
+  max1704x_open,
+  max1704x_close,
+  max1704x_read,
+  max1704x_write,
+  0,
+  max1704x_ioctl
+#ifndef CONFIG_DISABLE_POLL
+  , 0
+#endif
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+/****************************************************************************
+ * Name: max1704x_open
+ *
+ * Description:
+ *   This function is called whenever theMAX1704x device is opened.
+ *
+ ****************************************************************************/
+
+static int max1704x_open(FAR struct file *filep)
+{
+  return OK;
+}
+
+/****************************************************************************
+ * Name: max1704x_close
+ *
+ * Description:
+ *   This routine is called when theMAX1704x device is closed.
+ *
+ ****************************************************************************/
+
+static int max1704x_close(FAR struct file *filep)
+{
+  return OK;
+}
+
+/****************************************************************************
+ * Name: max1704x_read
+ ****************************************************************************/
+
+static ssize_t max1704x_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
+{
+  retrun 0;
+}
+
+/****************************************************************************
+ * Name: max1704x_write
+ ****************************************************************************/
+
+static ssize_t max1704x_write(FAR struct file *filep, FAR const char *buffer,
+                          size_t buflen)
+{
+  return -EACCESS;
+}
+
+/****************************************************************************
+ * Name: max1704x_ioctl
+ ****************************************************************************/
+
+static int max1704x_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
+{
+  FAR struct inode *inode = filep->f_inode;
+  FAR struct max1704x_dev_s *priv  = inode->i_private;
+  int ret   = OK;
+
+  switch (cmd)
+    {
+      default:
+        i2cdbg("Unrecognized cmd: %d\n", cmd);
+        ret = -ENOTTY;
+        break;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: max1704x_register
+ *
+ * Description:
+ *   Register theMAX1704x 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 MAX1704x
+ *   addr - The I2C address of the MAX1704x.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int max1704x_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c, uint8_t addr)
+{
+  FAR struct max1704x_dev_s *priv;
+  int ret;
+
+  /* Initialize theMAX1704x device structure */
+
+  priv = (FAR struct max1704x_dev_s *)kzalloc(sizeof(struct max1704x_dev_s));
+  if (!priv)
+    {
+      i2cdbg("Failed to allocate instance\n");
+      return -ENOMEM;
+    }
+
+  priv->i2c        = i2c;
+  priv->addr       = addr;
+
+  /* Register the character driver */
+
+  ret = register_driver(devpath, &g_max1704xfopg, 0555, priv);
+  if (ret < 0)
+    {
+      i2cdbg("Failed to register driver: %d\n", ret);
+      free(priv);
+    }
+  return ret;
+}
+#endif /* CONFIG_I2C && CONFIG_I2C_MAX1704X */