Initial import

1 files changed, 703 insertions, 0 deletions

diff --git a/drivers/hwmon/max6650.c b/drivers/hwmon/max6650.c
new file mode 100644
index 000000000..162a520f4
--- /dev/null
+++ b/drivers/hwmon/max6650.c
@@ -0,0 +1,703 @@
+/*
+ * max6650.c - Part of lm_sensors, Linux kernel modules for hardware
+ *             monitoring.
+ *
+ * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de>
+ *
+ * based on code written by John Morris <john.morris@spirentcom.com>
+ * Copyright (c) 2003 Spirent Communications
+ * and Claus Gindhart <claus.gindhart@kontron.com>
+ *
+ * This module has only been tested with the MAX6650 chip. It should
+ * also work with the MAX6651. It does not distinguish max6650 and max6651
+ * chips.
+ *
+ * The datasheet was last seen at:
+ *
+ *        http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
+ *
+ * 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>
+
+/*
+ * Insmod parameters
+ */
+
+/* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */
+static int fan_voltage;
+/* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */
+static int prescaler;
+/* clock: The clock frequency of the chip the driver should assume */
+static int clock = 254000;
+
+module_param(fan_voltage, int, S_IRUGO);
+module_param(prescaler, int, S_IRUGO);
+module_param(clock, int, S_IRUGO);
+
+/*
+ * MAX 6650/6651 registers
+ */
+
+#define MAX6650_REG_SPEED	0x00
+#define MAX6650_REG_CONFIG	0x02
+#define MAX6650_REG_GPIO_DEF	0x04
+#define MAX6650_REG_DAC		0x06
+#define MAX6650_REG_ALARM_EN	0x08
+#define MAX6650_REG_ALARM	0x0A
+#define MAX6650_REG_TACH0	0x0C
+#define MAX6650_REG_TACH1	0x0E
+#define MAX6650_REG_TACH2	0x10
+#define MAX6650_REG_TACH3	0x12
+#define MAX6650_REG_GPIO_STAT	0x14
+#define MAX6650_REG_COUNT	0x16
+
+/*
+ * Config register bits
+ */
+
+#define MAX6650_CFG_V12			0x08
+#define MAX6650_CFG_PRESCALER_MASK	0x07
+#define MAX6650_CFG_PRESCALER_2		0x01
+#define MAX6650_CFG_PRESCALER_4		0x02
+#define MAX6650_CFG_PRESCALER_8		0x03
+#define MAX6650_CFG_PRESCALER_16	0x04
+#define MAX6650_CFG_MODE_MASK		0x30
+#define MAX6650_CFG_MODE_ON		0x00
+#define MAX6650_CFG_MODE_OFF		0x10
+#define MAX6650_CFG_MODE_CLOSED_LOOP	0x20
+#define MAX6650_CFG_MODE_OPEN_LOOP	0x30
+#define MAX6650_COUNT_MASK		0x03
+
+/*
+ * Alarm status register bits
+ */
+
+#define MAX6650_ALRM_MAX	0x01
+#define MAX6650_ALRM_MIN	0x02
+#define MAX6650_ALRM_TACH	0x04
+#define MAX6650_ALRM_GPIO1	0x08
+#define MAX6650_ALRM_GPIO2	0x10
+
+/* Minimum and maximum values of the FAN-RPM */
+#define FAN_RPM_MIN 240
+#define FAN_RPM_MAX 30000
+
+#define DIV_FROM_REG(reg) (1 << (reg & 7))
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct max6650_data {
+	struct i2c_client *client;
+	const struct attribute_group *groups[3];
+	struct mutex update_lock;
+	int nr_fans;
+	char valid; /* zero until following fields are valid */
+	unsigned long last_updated; /* in jiffies */
+
+	/* register values */
+	u8 speed;
+	u8 config;
+	u8 tach[4];
+	u8 count;
+	u8 dac;
+	u8 alarm;
+};
+
+static const u8 tach_reg[] = {
+	MAX6650_REG_TACH0,
+	MAX6650_REG_TACH1,
+	MAX6650_REG_TACH2,
+	MAX6650_REG_TACH3,
+};
+
+static struct max6650_data *max6650_update_device(struct device *dev)
+{
+	struct max6650_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	int i;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+		data->speed = i2c_smbus_read_byte_data(client,
+						       MAX6650_REG_SPEED);
+		data->config = i2c_smbus_read_byte_data(client,
+							MAX6650_REG_CONFIG);
+		for (i = 0; i < data->nr_fans; i++) {
+			data->tach[i] = i2c_smbus_read_byte_data(client,
+								 tach_reg[i]);
+		}
+		data->count = i2c_smbus_read_byte_data(client,
+							MAX6650_REG_COUNT);
+		data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
+
+		/*
+		 * Alarms are cleared on read in case the condition that
+		 * caused the alarm is removed. Keep the value latched here
+		 * for providing the register through different alarm files.
+		 */
+		data->alarm |= i2c_smbus_read_byte_data(client,
+							MAX6650_REG_ALARM);
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+static ssize_t get_fan(struct device *dev, struct device_attribute *devattr,
+		       char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct max6650_data *data = max6650_update_device(dev);
+	int rpm;
+
+	/*
+	 * Calculation details:
+	 *
+	 * Each tachometer counts over an interval given by the "count"
+	 * register (0.25, 0.5, 1 or 2 seconds). This module assumes
+	 * that the fans produce two pulses per revolution (this seems
+	 * to be the most common).
+	 */
+
+	rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count));
+	return sprintf(buf, "%d\n", rpm);
+}
+
+/*
+ * Set the fan speed to the specified RPM (or read back the RPM setting).
+ * This works in closed loop mode only. Use pwm1 for open loop speed setting.
+ *
+ * The MAX6650/1 will automatically control fan speed when in closed loop
+ * mode.
+ *
+ * Assumptions:
+ *
+ * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use
+ *    the clock module parameter if you need to fine tune this.
+ *
+ * 2) The prescaler (low three bits of the config register) has already
+ *    been set to an appropriate value. Use the prescaler module parameter
+ *    if your BIOS doesn't initialize the chip properly.
+ *
+ * The relevant equations are given on pages 21 and 22 of the datasheet.
+ *
+ * From the datasheet, the relevant equation when in regulation is:
+ *
+ *    [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE
+ *
+ * where:
+ *
+ *    fCLK is the oscillator frequency (either the 254kHz internal
+ *         oscillator or the externally applied clock)
+ *
+ *    KTACH is the value in the speed register
+ *
+ *    FanSpeed is the speed of the fan in rps
+ *
+ *    KSCALE is the prescaler value (1, 2, 4, 8, or 16)
+ *
+ * When reading, we need to solve for FanSpeed. When writing, we need to
+ * solve for KTACH.
+ *
+ * Note: this tachometer is completely separate from the tachometers
+ * used to measure the fan speeds. Only one fan's speed (fan1) is
+ * controlled.
+ */
+
+static ssize_t get_target(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct max6650_data *data = max6650_update_device(dev);
+	int kscale, ktach, rpm;
+
+	/*
+	 * Use the datasheet equation:
+	 *
+	 *    FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
+	 *
+	 * then multiply by 60 to give rpm.
+	 */
+
+	kscale = DIV_FROM_REG(data->config);
+	ktach = data->speed;
+	rpm = 60 * kscale * clock / (256 * (ktach + 1));
+	return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t set_target(struct device *dev, struct device_attribute *devattr,
+			 const char *buf, size_t count)
+{
+	struct max6650_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	int kscale, ktach;
+	unsigned long rpm;
+	int err;
+
+	err = kstrtoul(buf, 10, &rpm);
+	if (err)
+		return err;
+
+	rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
+
+	/*
+	 * Divide the required speed by 60 to get from rpm to rps, then
+	 * use the datasheet equation:
+	 *
+	 *     KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1
+	 */
+
+	mutex_lock(&data->update_lock);
+
+	kscale = DIV_FROM_REG(data->config);
+	ktach = ((clock * kscale) / (256 * rpm / 60)) - 1;
+	if (ktach < 0)
+		ktach = 0;
+	if (ktach > 255)
+		ktach = 255;
+	data->speed = ktach;
+
+	i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed);
+
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/*
+ * Get/set the fan speed in open loop mode using pwm1 sysfs file.
+ * Speed is given as a relative value from 0 to 255, where 255 is maximum
+ * speed. Note that this is done by writing directly to the chip's DAC,
+ * it won't change the closed loop speed set by fan1_target.
+ * Also note that due to rounding errors it is possible that you don't read
+ * back exactly the value you have set.
+ */
+
+static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr,
+		       char *buf)
+{
+	int pwm;
+	struct max6650_data *data = max6650_update_device(dev);
+
+	/*
+	 * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
+	 * Lower DAC values mean higher speeds.
+	 */
+	if (data->config & MAX6650_CFG_V12)
+		pwm = 255 - (255 * (int)data->dac)/180;
+	else
+		pwm = 255 - (255 * (int)data->dac)/76;
+
+	if (pwm < 0)
+		pwm = 0;
+
+	return sprintf(buf, "%d\n", pwm);
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
+			const char *buf, size_t count)
+{
+	struct max6650_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	unsigned long pwm;
+	int err;
+
+	err = kstrtoul(buf, 10, &pwm);
+	if (err)
+		return err;
+
+	pwm = clamp_val(pwm, 0, 255);
+
+	mutex_lock(&data->update_lock);
+
+	if (data->config & MAX6650_CFG_V12)
+		data->dac = 180 - (180 * pwm)/255;
+	else
+		data->dac = 76 - (76 * pwm)/255;
+
+	i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
+
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/*
+ * Get/Set controller mode:
+ * Possible values:
+ * 0 = Fan always on
+ * 1 = Open loop, Voltage is set according to speed, not regulated.
+ * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer
+ */
+
+static ssize_t get_enable(struct device *dev, struct device_attribute *devattr,
+			  char *buf)
+{
+	struct max6650_data *data = max6650_update_device(dev);
+	int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
+	int sysfs_modes[4] = {0, 1, 2, 1};
+
+	return sprintf(buf, "%d\n", sysfs_modes[mode]);
+}
+
+static ssize_t set_enable(struct device *dev, struct device_attribute *devattr,
+			  const char *buf, size_t count)
+{
+	struct max6650_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	int max6650_modes[3] = {0, 3, 2};
+	unsigned long mode;
+	int err;
+
+	err = kstrtoul(buf, 10, &mode);
+	if (err)
+		return err;
+
+	if (mode > 2)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+
+	data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
+	data->config = (data->config & ~MAX6650_CFG_MODE_MASK)
+		       | (max6650_modes[mode] << 4);
+
+	i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config);
+
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/*
+ * Read/write functions for fan1_div sysfs file. The MAX6650 has no such
+ * divider. We handle this by converting between divider and counttime:
+ *
+ * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3
+ *
+ * Lower values of k allow to connect a faster fan without the risk of
+ * counter overflow. The price is lower resolution. You can also set counttime
+ * using the module parameter. Note that the module parameter "prescaler" also
+ * influences the behaviour. Unfortunately, there's no sysfs attribute
+ * defined for that. See the data sheet for details.
+ */
+
+static ssize_t get_div(struct device *dev, struct device_attribute *devattr,
+		       char *buf)
+{
+	struct max6650_data *data = max6650_update_device(dev);
+
+	return sprintf(buf, "%d\n", DIV_FROM_REG(data->count));
+}
+
+static ssize_t set_div(struct device *dev, struct device_attribute *devattr,
+		       const char *buf, size_t count)
+{
+	struct max6650_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	unsigned long div;
+	int err;
+
+	err = kstrtoul(buf, 10, &div);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	switch (div) {
+	case 1:
+		data->count = 0;
+		break;
+	case 2:
+		data->count = 1;
+		break;
+	case 4:
+		data->count = 2;
+		break;
+	case 8:
+		data->count = 3;
+		break;
+	default:
+		mutex_unlock(&data->update_lock);
+		return -EINVAL;
+	}
+
+	i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/*
+ * Get alarm stati:
+ * Possible values:
+ * 0 = no alarm
+ * 1 = alarm
+ */
+
+static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct max6650_data *data = max6650_update_device(dev);
+	struct i2c_client *client = data->client;
+	int alarm = 0;
+
+	if (data->alarm & attr->index) {
+		mutex_lock(&data->update_lock);
+		alarm = 1;
+		data->alarm &= ~attr->index;
+		data->alarm |= i2c_smbus_read_byte_data(client,
+							MAX6650_REG_ALARM);
+		mutex_unlock(&data->update_lock);
+	}
+
+	return sprintf(buf, "%d\n", alarm);
+}
+
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
+static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target);
+static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div);
+static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable);
+static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm);
+static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL,
+			  MAX6650_ALRM_MAX);
+static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL,
+			  MAX6650_ALRM_MIN);
+static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL,
+			  MAX6650_ALRM_TACH);
+static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL,
+			  MAX6650_ALRM_GPIO1);
+static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL,
+			  MAX6650_ALRM_GPIO2);
+
+static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
+				    int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct max6650_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
+	struct device_attribute *devattr;
+
+	/*
+	 * Hide the alarms that have not been enabled by the firmware
+	 */
+
+	devattr = container_of(a, struct device_attribute, attr);
+	if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr
+	 || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr
+	 || devattr == &sensor_dev_attr_fan1_fault.dev_attr
+	 || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr
+	 || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
+		if (!(alarm_en & to_sensor_dev_attr(devattr)->index))
+			return 0;
+	}
+
+	return a->mode;
+}
+
+static struct attribute *max6650_attrs[] = {
+	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&dev_attr_fan1_target.attr,
+	&dev_attr_fan1_div.attr,
+	&dev_attr_pwm1_enable.attr,
+	&dev_attr_pwm1.attr,
+	&sensor_dev_attr_fan1_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan1_fault.dev_attr.attr,
+	&sensor_dev_attr_gpio1_alarm.dev_attr.attr,
+	&sensor_dev_attr_gpio2_alarm.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group max6650_group = {
+	.attrs = max6650_attrs,
+	.is_visible = max6650_attrs_visible,
+};
+
+static struct attribute *max6651_attrs[] = {
+	&sensor_dev_attr_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan3_input.dev_attr.attr,
+	&sensor_dev_attr_fan4_input.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group max6651_group = {
+	.attrs = max6651_attrs,
+};
+
+/*
+ * Real code
+ */
+
+static int max6650_init_client(struct max6650_data *data,
+			       struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	int config;
+	int err = -EIO;
+
+	config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
+
+	if (config < 0) {
+		dev_err(dev, "Error reading config, aborting.\n");
+		return err;
+	}
+
+	switch (fan_voltage) {
+	case 0:
+		break;
+	case 5:
+		config &= ~MAX6650_CFG_V12;
+		break;
+	case 12:
+		config |= MAX6650_CFG_V12;
+		break;
+	default:
+		dev_err(dev, "illegal value for fan_voltage (%d)\n",
+			fan_voltage);
+	}
+
+	dev_info(dev, "Fan voltage is set to %dV.\n",
+		 (config & MAX6650_CFG_V12) ? 12 : 5);
+
+	switch (prescaler) {
+	case 0:
+		break;
+	case 1:
+		config &= ~MAX6650_CFG_PRESCALER_MASK;
+		break;
+	case 2:
+		config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+			 | MAX6650_CFG_PRESCALER_2;
+		break;
+	case  4:
+		config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+			 | MAX6650_CFG_PRESCALER_4;
+		break;
+	case  8:
+		config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+			 | MAX6650_CFG_PRESCALER_8;
+		break;
+	case 16:
+		config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+			 | MAX6650_CFG_PRESCALER_16;
+		break;
+	default:
+		dev_err(dev, "illegal value for prescaler (%d)\n", prescaler);
+	}
+
+	dev_info(dev, "Prescaler is set to %d.\n",
+		 1 << (config & MAX6650_CFG_PRESCALER_MASK));
+
+	/*
+	 * If mode is set to "full off", we change it to "open loop" and
+	 * set DAC to 255, which has the same effect. We do this because
+	 * there's no "full off" mode defined in hwmon specifications.
+	 */
+
+	if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) {
+		dev_dbg(dev, "Change mode to open loop, full off.\n");
+		config = (config & ~MAX6650_CFG_MODE_MASK)
+			 | MAX6650_CFG_MODE_OPEN_LOOP;
+		if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) {
+			dev_err(dev, "DAC write error, aborting.\n");
+			return err;
+		}
+	}
+
+	if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) {
+		dev_err(dev, "Config write error, aborting.\n");
+		return err;
+	}
+
+	data->config = config;
+	data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
+
+	return 0;
+}
+
+static int max6650_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct max6650_data *data;
+	struct device *hwmon_dev;
+	int err;
+
+	data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	mutex_init(&data->update_lock);
+	data->nr_fans = id->driver_data;
+
+	/*
+	 * Initialize the max6650 chip
+	 */
+	err = max6650_init_client(data, client);
+	if (err)
+		return err;
+
+	data->groups[0] = &max6650_group;
+	/* 3 additional fan inputs for the MAX6651 */
+	if (data->nr_fans == 4)
+		data->groups[1] = &max6651_group;
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+							   client->name, data,
+							   data->groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id max6650_id[] = {
+	{ "max6650", 1 },
+	{ "max6651", 4 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max6650_id);
+
+static struct i2c_driver max6650_driver = {
+	.driver = {
+		.name	= "max6650",
+	},
+	.probe		= max6650_probe,
+	.id_table	= max6650_id,
+};
+
+module_i2c_driver(max6650_driver);
+
+MODULE_AUTHOR("Hans J. Koch");
+MODULE_DESCRIPTION("MAX6650 sensor driver");
+MODULE_LICENSE("GPL");