hwmon: Driver for MAX1668
David George [Thu, 2 Jun 2011 15:43:45 +0000 (08:43 -0700)]
This patch adds support for MAX1668 and compatible temperature sensors.

Signed-off-by: David George <david.george@ska.ac.za>
[guenter.roeck@ericsson.com: minor cleanup of probe error path]
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

Documentation/hwmon/max1668 [new file with mode: 0644]
MAINTAINERS
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/max1668.c [new file with mode: 0644]

diff --git a/Documentation/hwmon/max1668 b/Documentation/hwmon/max1668
new file mode 100644 (file)
index 0000000..0616ed9
--- /dev/null
@@ -0,0 +1,60 @@
+Kernel driver max1668
+=====================
+
+Supported chips:
+  * Maxim MAX1668, MAX1805 and MAX1989
+    Prefix: 'max1668'
+    Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e
+    Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX1668-MAX1989.pdf
+
+Author:
+    David George <david.george@ska.ac.za>
+
+Description
+-----------
+
+This driver implements support for the Maxim MAX1668, MAX1805 and MAX1989
+chips.
+
+The three devices are very similar, but the MAX1805 has a reduced feature
+set; only two remote temperature inputs vs the four avaible on the other
+two ICs.
+
+The driver is able to distinguish between the devices and creates sysfs
+entries as follows:
+
+MAX1805, MAX1668 and MAX1989:
+
+temp1_input     ro local (ambient) temperature
+temp1_max       rw local temperature maximum threshold for alarm
+temp1_max_alarm ro local temperature maximum threshold alarm
+temp1_min       rw local temperature minimum threshold for alarm
+temp1_min_alarm ro local temperature minimum threshold alarm
+temp2_input     ro remote temperature 1
+temp2_max       rw remote temperature 1 maximum threshold for alarm
+temp2_max_alarm ro remote temperature 1 maximum threshold alarm
+temp2_min       rw remote temperature 1 minimum threshold for alarm
+temp2_min_alarm ro remote temperature 1 minimum threshold alarm
+temp3_input     ro remote temperature 2
+temp3_max       rw remote temperature 2 maximum threshold for alarm
+temp3_max_alarm ro remote temperature 2 maximum threshold alarm
+temp3_min       rw remote temperature 2 minimum threshold for alarm
+temp3_min_alarm ro remote temperature 2 minimum threshold alarm
+
+MAX1668 and MAX1989 only:
+temp4_input     ro remote temperature 3
+temp4_max       rw remote temperature 3 maximum threshold for alarm
+temp4_max_alarm ro remote temperature 3 maximum threshold alarm
+temp4_min       rw remote temperature 3 minimum threshold for alarm
+temp4_min_alarm ro remote temperature 3 minimum threshold alarm
+temp5_input     ro remote temperature 4
+temp5_max       rw remote temperature 4 maximum threshold for alarm
+temp5_max_alarm ro remote temperature 4 maximum threshold alarm
+temp5_min       rw remote temperature 4 minimum threshold for alarm
+temp5_min_alarm ro remote temperature 4 minimum threshold alarm
+
+Module Parameters
+-----------------
+
+* read_only: int
+  Set to non-zero if you wish to prevent write access to alarm thresholds.
index 187282d..ccf1feb 100644 (file)
@@ -4120,6 +4120,13 @@ S:       Orphan
 F:     drivers/video/matrox/matroxfb_*
 F:     include/linux/matroxfb.h
 
+MAX1668 TEMPERATURE SENSOR DRIVER
+M:     "David George" <david.george@ska.ac.za>
+L:     lm-sensors@lm-sensors.org
+S:     Maintained
+F:     Documentation/hwmon/max1668
+F:     drivers/hwmon/max1668.c
+
 MAX6650 HARDWARE MONITOR AND FAN CONTROLLER DRIVER
 M:     "Hans J. Koch" <hjk@hansjkoch.de>
 L:     lm-sensors@lm-sensors.org
index 5f888f7..dec5eee 100644 (file)
@@ -736,6 +736,16 @@ config SENSORS_MAX1619
          This driver can also be built as a module.  If so, the module
          will be called max1619.
 
+config SENSORS_MAX1668
+       tristate "Maxim MAX1668 and compatibles"
+       depends on I2C && EXPERIMENTAL
+       help
+         If you say yes here you get support for MAX1668, MAX1989 and
+         MAX1805 chips.
+
+         This driver can also be built as a module.  If so, the module
+         will be called max1668.
+
 config SENSORS_MAX6639
        tristate "Maxim MAX6639 sensor chip"
        depends on I2C && EXPERIMENTAL
index 28061cf..a6d519e 100644 (file)
@@ -87,6 +87,7 @@ obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
 obj-$(CONFIG_SENSORS_MAX1111)  += max1111.o
 obj-$(CONFIG_SENSORS_MAX16065) += max16065.o
 obj-$(CONFIG_SENSORS_MAX1619)  += max1619.o
+obj-$(CONFIG_SENSORS_MAX1668)  += max1668.o
 obj-$(CONFIG_SENSORS_MAX6639)  += max6639.o
 obj-$(CONFIG_SENSORS_MAX6642)  += max6642.o
 obj-$(CONFIG_SENSORS_MAX6650)  += max6650.o
diff --git a/drivers/hwmon/max1668.c b/drivers/hwmon/max1668.c
new file mode 100644 (file)
index 0000000..ddefb64
--- /dev/null
@@ -0,0 +1,480 @@
+/*
+    Copyright (c) 2011 David George <david.george@ska.ac.za>
+
+    based on adm1021.c
+    some credit to Christoph Scheurer, but largely a rewrite
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+/* Addresses to scan */
+static unsigned short max1668_addr_list[] = {
+       0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
+
+/* max1668 registers */
+
+#define MAX1668_REG_TEMP(nr)   (nr)
+#define MAX1668_REG_STAT1      0x05
+#define MAX1668_REG_STAT2      0x06
+#define MAX1668_REG_MAN_ID     0xfe
+#define MAX1668_REG_DEV_ID     0xff
+
+/* limits */
+
+/* write high limits */
+#define MAX1668_REG_LIMH_WR(nr)        (0x13 + 2 * (nr))
+/* write low limits */
+#define MAX1668_REG_LIML_WR(nr)        (0x14 + 2 * (nr))
+/* read high limits */
+#define MAX1668_REG_LIMH_RD(nr)        (0x08 + 2 * (nr))
+/* read low limits */
+#define MAX1668_REG_LIML_RD(nr)        (0x09 + 2 * (nr))
+
+/* manufacturer and device ID Constants */
+#define MAN_ID_MAXIM           0x4d
+#define DEV_ID_MAX1668         0x3
+#define DEV_ID_MAX1805         0x5
+#define DEV_ID_MAX1989         0xb
+
+/* read only mode module parameter */
+static int read_only;
+module_param(read_only, bool, 0);
+MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
+
+enum chips { max1668, max1805, max1989 };
+
+struct max1668_data {
+       struct device *hwmon_dev;
+       enum chips type;
+
+       struct mutex update_lock;
+       char valid;             /* !=0 if following fields are valid */
+       unsigned long last_updated;     /* In jiffies */
+
+       /* 1x local and 4x remote */
+       s8 temp_max[5];
+       s8 temp_min[5];
+       s8 temp[5];
+       u16 alarms;
+};
+
+static struct max1668_data *max1668_update_device(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct max1668_data *data = i2c_get_clientdata(client);
+       struct max1668_data *ret = data;
+       s32 val;
+       int i;
+
+       mutex_lock(&data->update_lock);
+
+       if (data->valid && !time_after(jiffies,
+                       data->last_updated + HZ + HZ / 2))
+               goto abort;
+
+       for (i = 0; i < 5; i++) {
+               val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
+               if (unlikely(val < 0)) {
+                       ret = ERR_PTR(val);
+                       goto abort;
+               }
+               data->temp[i] = (s8) val;
+
+               val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
+               if (unlikely(val < 0)) {
+                       ret = ERR_PTR(val);
+                       goto abort;
+               }
+               data->temp_max[i] = (s8) val;
+
+               val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
+               if (unlikely(val < 0)) {
+                       ret = ERR_PTR(val);
+                       goto abort;
+               }
+               data->temp_min[i] = (s8) val;
+       }
+
+       val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
+       if (unlikely(val < 0)) {
+               ret = ERR_PTR(val);
+               goto abort;
+       }
+       data->alarms &= 0x00ff;
+       data->alarms |= ((u8) (val & 0x60)) << 8;
+
+       val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
+       if (unlikely(val < 0)) {
+               ret = ERR_PTR(val);
+               goto abort;
+       }
+       data->alarms &= 0xff00;
+       data->alarms |= ((u8) val);
+
+       data->last_updated = jiffies;
+       data->valid = 1;
+abort:
+       mutex_unlock(&data->update_lock);
+
+       return ret;
+}
+
+static ssize_t show_temp(struct device *dev,
+                        struct device_attribute *devattr, char *buf)
+{
+       int index = to_sensor_dev_attr(devattr)->index;
+       struct max1668_data *data = max1668_update_device(dev);
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       return sprintf(buf, "%d\n", data->temp[index] * 1000);
+}
+
+static ssize_t show_temp_max(struct device *dev,
+                            struct device_attribute *devattr, char *buf)
+{
+       int index = to_sensor_dev_attr(devattr)->index;
+       struct max1668_data *data = max1668_update_device(dev);
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
+}
+
+static ssize_t show_temp_min(struct device *dev,
+                            struct device_attribute *devattr, char *buf)
+{
+       int index = to_sensor_dev_attr(devattr)->index;
+       struct max1668_data *data = max1668_update_device(dev);
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+       int index = to_sensor_dev_attr(attr)->index;
+       struct max1668_data *data = max1668_update_device(dev);
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
+}
+
+static ssize_t set_temp_max(struct device *dev,
+                           struct device_attribute *devattr,
+                           const char *buf, size_t count)
+{
+       int index = to_sensor_dev_attr(devattr)->index;
+       struct i2c_client *client = to_i2c_client(dev);
+       struct max1668_data *data = i2c_get_clientdata(client);
+       long temp;
+       int ret;
+
+       ret = kstrtol(buf, 10, &temp);
+       if (ret < 0)
+               return ret;
+
+       mutex_lock(&data->update_lock);
+       data->temp_max[index] = SENSORS_LIMIT(temp/1000, -128, 127);
+       if (i2c_smbus_write_byte_data(client,
+                                       MAX1668_REG_LIMH_WR(index),
+                                       data->temp_max[index]))
+               count = -EIO;
+       mutex_unlock(&data->update_lock);
+
+       return count;
+}
+
+static ssize_t set_temp_min(struct device *dev,
+                           struct device_attribute *devattr,
+                           const char *buf, size_t count)
+{
+       int index = to_sensor_dev_attr(devattr)->index;
+       struct i2c_client *client = to_i2c_client(dev);
+       struct max1668_data *data = i2c_get_clientdata(client);
+       long temp;
+       int ret;
+
+       ret = kstrtol(buf, 10, &temp);
+       if (ret < 0)
+               return ret;
+
+       mutex_lock(&data->update_lock);
+       data->temp_min[index] = SENSORS_LIMIT(temp/1000, -128, 127);
+       if (i2c_smbus_write_byte_data(client,
+                                       MAX1668_REG_LIML_WR(index),
+                                       data->temp_max[index]))
+               count = -EIO;
+       mutex_unlock(&data->update_lock);
+
+       return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
+                               set_temp_max, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min,
+                               set_temp_min, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max,
+                               set_temp_max, 1);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
+                               set_temp_min, 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
+                               set_temp_max, 2);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
+                               set_temp_min, 2);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
+                               set_temp_max, 3);
+static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
+                               set_temp_min, 3);
+static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
+                               set_temp_max, 4);
+static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
+                               set_temp_min, 4);
+
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);
+
+/* Attributes common to MAX1668, MAX1989 and MAX1805 */
+static struct attribute *max1668_attribute_common[] = {
+       &sensor_dev_attr_temp1_max.dev_attr.attr,
+       &sensor_dev_attr_temp1_min.dev_attr.attr,
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_temp2_max.dev_attr.attr,
+       &sensor_dev_attr_temp2_min.dev_attr.attr,
+       &sensor_dev_attr_temp2_input.dev_attr.attr,
+       &sensor_dev_attr_temp3_max.dev_attr.attr,
+       &sensor_dev_attr_temp3_min.dev_attr.attr,
+       &sensor_dev_attr_temp3_input.dev_attr.attr,
+
+       &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+       NULL
+};
+
+/* Attributes not present on MAX1805 */
+static struct attribute *max1668_attribute_unique[] = {
+       &sensor_dev_attr_temp4_max.dev_attr.attr,
+       &sensor_dev_attr_temp4_min.dev_attr.attr,
+       &sensor_dev_attr_temp4_input.dev_attr.attr,
+       &sensor_dev_attr_temp5_max.dev_attr.attr,
+       &sensor_dev_attr_temp5_min.dev_attr.attr,
+       &sensor_dev_attr_temp5_input.dev_attr.attr,
+
+       &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
+       NULL
+};
+
+static mode_t max1668_attribute_mode(struct kobject *kobj,
+                                    struct attribute *attr, int index)
+{
+       int ret = S_IRUGO;
+       if (read_only)
+               return ret;
+       if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp2_max.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp3_max.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp4_max.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp5_max.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp1_min.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp2_min.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp3_min.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp4_min.dev_attr.attr ||
+           attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
+               ret |= S_IWUSR;
+       return ret;
+}
+
+static const struct attribute_group max1668_group_common = {
+       .attrs = max1668_attribute_common,
+       .is_visible = max1668_attribute_mode
+};
+
+static const struct attribute_group max1668_group_unique = {
+       .attrs = max1668_attribute_unique,
+       .is_visible = max1668_attribute_mode
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max1668_detect(struct i2c_client *client,
+                         struct i2c_board_info *info)
+{
+       struct i2c_adapter *adapter = client->adapter;
+       const char *type_name;
+       int man_id, dev_id;
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+               return -ENODEV;
+
+       /* Check for unsupported part */
+       man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
+       if (man_id != MAN_ID_MAXIM)
+               return -ENODEV;
+
+       dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
+       if (dev_id < 0)
+               return -ENODEV;
+
+       type_name = NULL;
+       if (dev_id == DEV_ID_MAX1668)
+               type_name = "max1668";
+       else if (dev_id == DEV_ID_MAX1805)
+               type_name = "max1805";
+       else if (dev_id == DEV_ID_MAX1989)
+               type_name = "max1989";
+
+       if (!type_name)
+               return -ENODEV;
+
+       strlcpy(info->type, type_name, I2C_NAME_SIZE);
+
+       return 0;
+}
+
+static int max1668_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct i2c_adapter *adapter = client->adapter;
+       struct max1668_data *data;
+       int err;
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+               return -ENODEV;
+
+       data = kzalloc(sizeof(struct max1668_data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       i2c_set_clientdata(client, data);
+       data->type = id->driver_data;
+       mutex_init(&data->update_lock);
+
+       /* Register sysfs hooks */
+       err = sysfs_create_group(&client->dev.kobj, &max1668_group_common);
+       if (err)
+               goto error_free;
+
+       if (data->type == max1668 || data->type == max1989) {
+               err = sysfs_create_group(&client->dev.kobj,
+                                        &max1668_group_unique);
+               if (err)
+                       goto error_sysrem0;
+       }
+
+       data->hwmon_dev = hwmon_device_register(&client->dev);
+       if (IS_ERR(data->hwmon_dev)) {
+               err = PTR_ERR(data->hwmon_dev);
+               goto error_sysrem1;
+       }
+
+       return 0;
+
+error_sysrem1:
+       if (data->type == max1668 || data->type == max1989)
+               sysfs_remove_group(&client->dev.kobj, &max1668_group_unique);
+error_sysrem0:
+       sysfs_remove_group(&client->dev.kobj, &max1668_group_common);
+error_free:
+       kfree(data);
+       return err;
+}
+
+static int max1668_remove(struct i2c_client *client)
+{
+       struct max1668_data *data = i2c_get_clientdata(client);
+
+       hwmon_device_unregister(data->hwmon_dev);
+       if (data->type == max1668 || data->type == max1989)
+               sysfs_remove_group(&client->dev.kobj, &max1668_group_unique);
+
+       sysfs_remove_group(&client->dev.kobj, &max1668_group_common);
+
+       kfree(data);
+       return 0;
+}
+
+static const struct i2c_device_id max1668_id[] = {
+       { "max1668", max1668 },
+       { "max1805", max1805 },
+       { "max1989", max1989 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, max1668_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max1668_driver = {
+       .class = I2C_CLASS_HWMON,
+       .driver = {
+                 .name = "max1668",
+                 },
+       .probe = max1668_probe,
+       .remove = max1668_remove,
+       .id_table = max1668_id,
+       .detect = max1668_detect,
+       .address_list = max1668_addr_list,
+};
+
+static int __init sensors_max1668_init(void)
+{
+       return i2c_add_driver(&max1668_driver);
+}
+
+static void __exit sensors_max1668_exit(void)
+{
+       i2c_del_driver(&max1668_driver);
+}
+
+MODULE_AUTHOR("David George <david.george@ska.ac.za>");
+MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_max1668_init)
+module_exit(sensors_max1668_exit)