hwmon: New driver for Analog Devices ADT7473 sensor chip

This driver reports voltage, temperature and fan sensor readings
on an ADT7473 chip.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

4 files changed, 1247 insertions, 0 deletions

diff --git a/Documentation/hwmon/adt7473 b/Documentation/hwmon/adt7473
new file mode 100644
index 000000000000..22d8b19046ab
--- /dev/null
+++ b/Documentation/hwmon/adt7473
@@ -0,0 +1,79 @@
+Kernel driver adt7473
+======================
+
+Supported chips:
+  * Analog Devices ADT7473
+    Prefix: 'adt7473'
+    Addresses scanned: I2C 0x2C, 0x2D, 0x2E
+    Datasheet: Publicly available at the Analog Devices website
+
+Author: Darrick J. Wong
+
+Description
+-----------
+
+This driver implements support for the Analog Devices ADT7473 chip family.
+
+The LM85 uses the 2-wire interface compatible with the SMBUS 2.0
+specification. Using an analog to digital converter it measures three (3)
+temperatures and two (2) voltages. It has three (3) 16-bit counters for
+measuring fan speed. There are three (3) PWM outputs that can be used
+to control fan speed.
+
+A sophisticated control system for the PWM outputs is designed into the
+LM85 that allows fan speed to be adjusted automatically based on any of the
+three temperature sensors. Each PWM output is individually adjustable and
+programmable. Once configured, the ADT7473 will adjust the PWM outputs in
+response to the measured temperatures without further host intervention.
+This feature can also be disabled for manual control of the PWM's.
+
+Each of the measured inputs (voltage, temperature, fan speed) has
+corresponding high/low limit values. The ADT7473 will signal an ALARM if
+any measured value exceeds either limit.
+
+The ADT7473 samples all inputs continuously. The driver will not read
+the registers more often than once every other second. Further,
+configuration data is only read once per minute.
+
+Special Features
+----------------
+
+The ADT7473 have a 10-bit ADC and can therefore measure temperatures
+with 0.25 degC resolution. Temperature readings can be configured either
+for twos complement format or "Offset 64" format, wherein 63 is subtracted
+from the raw value to get the temperature value.
+
+The Analog Devices datasheet is very detailed and describes a procedure for
+determining an optimal configuration for the automatic PWM control.
+
+Hardware Configurations
+-----------------------
+
+The ADT7473 chips have an optional SMBALERT output that can be used to
+signal the chipset in case a limit is exceeded or the temperature sensors
+fail. Individual sensor interrupts can be masked so they won't trigger
+SMBALERT. The SMBALERT output if configured replaces the PWM2 function.
+
+Configuration Notes
+-------------------
+
+Besides standard interfaces driver adds the following:
+
+* PWM Control
+
+* pwm#_auto_point1_pwm and pwm#_auto_point1_temp and
+* pwm#_auto_point2_pwm and pwm#_auto_point2_temp -
+
+point1: Set the pwm speed at a lower temperature bound.
+point2: Set the pwm speed at a higher temperature bound.
+
+The ADT7473 will scale the pwm between the lower and higher pwm speed when
+the temperature is between the two temperature boundaries.  PWM values range
+from 0 (off) to 255 (full speed).
+
+Notes
+-----
+
+The NVIDIA binary driver presents an ADT7473 chip via an on-card i2c bus.
+Unfortunately, they fail to set the i2c adapter class, so this driver may
+fail to find the chip until the nvidia driver is patched.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 410ffe4e9d80..368879ff5d8c 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -143,6 +143,16 @@ config SENSORS_ADT7470
 	  This driver can also be built as a module. If so, the module
 	  will be called adt7470.
 
+config SENSORS_ADT7473
+	tristate "Analog Devices ADT7473"
+	depends on I2C && EXPERIMENTAL
+	help
+	  If you say yes here you get support for the Analog Devices
+	  ADT7473 temperature monitoring chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called adt7473.
+
 config SENSORS_K8TEMP
 	tristate "AMD Athlon64/FX or Opteron temperature sensor"
 	depends on X86 && PCI && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 824161337f1c..3bdb05a5cbd7 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_ADM1031)	+= adm1031.o
 obj-$(CONFIG_SENSORS_ADM9240)	+= adm9240.o
 obj-$(CONFIG_SENSORS_ADS7828)	+= ads7828.o
 obj-$(CONFIG_SENSORS_ADT7470)	+= adt7470.o
+obj-$(CONFIG_SENSORS_ADT7473)	+= adt7473.o
 obj-$(CONFIG_SENSORS_APPLESMC)	+= applesmc.o
 obj-$(CONFIG_SENSORS_AMS)	+= ams/
 obj-$(CONFIG_SENSORS_ATXP1)	+= atxp1.o
diff --git a/drivers/hwmon/adt7473.c b/drivers/hwmon/adt7473.c
new file mode 100644
index 000000000000..a3daeefff472
--- /dev/null
+++ b/drivers/hwmon/adt7473.c
@@ -0,0 +1,1157 @@
+/*
+ * A hwmon driver for the Analog Devices ADT7473
+ * Copyright (C) 2007 IBM
+ *
+ * Author: Darrick J. Wong <djwong@us.ibm.com>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.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>
+#include <linux/delay.h>
+#include <linux/log2.h>
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x2C, 0x2D, 0x2E, I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD_1(adt7473);
+
+/* ADT7473 registers */
+#define ADT7473_REG_BASE_ADDR			0x20
+
+#define ADT7473_REG_VOLT_BASE_ADDR		0x21
+#define ADT7473_REG_VOLT_MAX_ADDR		0x22
+#define ADT7473_REG_VOLT_MIN_BASE_ADDR		0x46
+#define ADT7473_REG_VOLT_MIN_MAX_ADDR		0x49
+
+#define ADT7473_REG_TEMP_BASE_ADDR		0x25
+#define ADT7473_REG_TEMP_MAX_ADDR		0x27
+#define ADT7473_REG_TEMP_LIMITS_BASE_ADDR	0x4E
+#define ADT7473_REG_TEMP_LIMITS_MAX_ADDR	0x53
+#define ADT7473_REG_TEMP_TMIN_BASE_ADDR		0x67
+#define ADT7473_REG_TEMP_TMIN_MAX_ADDR		0x69
+#define ADT7473_REG_TEMP_TMAX_BASE_ADDR		0x6A
+#define ADT7473_REG_TEMP_TMAX_MAX_ADDR		0x6C
+
+#define ADT7473_REG_FAN_BASE_ADDR		0x28
+#define ADT7473_REG_FAN_MAX_ADDR		0x2F
+#define ADT7473_REG_FAN_MIN_BASE_ADDR		0x54
+#define ADT7473_REG_FAN_MIN_MAX_ADDR		0x5B
+
+#define ADT7473_REG_PWM_BASE_ADDR		0x30
+#define ADT7473_REG_PWM_MAX_ADDR		0x32
+#define	ADT7473_REG_PWM_MIN_BASE_ADDR		0x64
+#define ADT7473_REG_PWM_MIN_MAX_ADDR		0x66
+#define ADT7473_REG_PWM_MAX_BASE_ADDR		0x38
+#define ADT7473_REG_PWM_MAX_MAX_ADDR		0x3A
+#define ADT7473_REG_PWM_BHVR_BASE_ADDR		0x5C
+#define ADT7473_REG_PWM_BHVR_MAX_ADDR		0x5E
+#define		ADT7473_PWM_BHVR_MASK		0xE0
+#define		ADT7473_PWM_BHVR_SHIFT		5
+
+#define ADT7473_REG_CFG1			0x40
+#define 	ADT7473_CFG1_START		0x01
+#define		ADT7473_CFG1_READY		0x04
+#define ADT7473_REG_CFG2			0x73
+#define ADT7473_REG_CFG3			0x78
+#define ADT7473_REG_CFG4			0x7D
+#define		ADT7473_CFG4_MAX_DUTY_AT_OVT	0x08
+#define ADT7473_REG_CFG5			0x7C
+#define		ADT7473_CFG5_TEMP_TWOS		0x01
+#define		ADT7473_CFG5_TEMP_OFFSET	0x02
+
+#define ADT7473_REG_DEVICE			0x3D
+#define 	ADT7473_VENDOR			0x41
+#define ADT7473_REG_VENDOR			0x3E
+#define 	ADT7473_DEVICE			0x73
+#define ADT7473_REG_REVISION			0x3F
+#define 	ADT7473_REV_68			0x68
+#define 	ADT7473_REV_69			0x69
+
+#define ADT7473_REG_ALARM1			0x41
+#define		ADT7473_VCCP_ALARM		0x02
+#define		ADT7473_VCC_ALARM		0x04
+#define		ADT7473_R1T_ALARM		0x10
+#define		ADT7473_LT_ALARM		0x20
+#define		ADT7473_R2T_ALARM		0x40
+#define		ADT7473_OOL			0x80
+#define ADT7473_REG_ALARM2			0x42
+#define		ADT7473_OVT_ALARM		0x02
+#define		ADT7473_FAN1_ALARM		0x04
+#define		ADT7473_FAN2_ALARM		0x08
+#define		ADT7473_FAN3_ALARM		0x10
+#define		ADT7473_FAN4_ALARM		0x20
+#define		ADT7473_R1T_SHORT		0x40
+#define		ADT7473_R2T_SHORT		0x80
+#define ADT7473_REG_MAX_ADDR			0x80
+
+#define ALARM2(x)	((x) << 8)
+
+#define ADT7473_VOLT_COUNT	2
+#define ADT7473_REG_VOLT(x)	(ADT7473_REG_VOLT_BASE_ADDR + (x))
+#define ADT7473_REG_VOLT_MIN(x)	(ADT7473_REG_VOLT_MIN_BASE_ADDR + ((x) * 2))
+#define ADT7473_REG_VOLT_MAX(x)	(ADT7473_REG_VOLT_MIN_BASE_ADDR + \
+				((x) * 2) + 1)
+
+#define ADT7473_TEMP_COUNT	3
+#define ADT7473_REG_TEMP(x)	(ADT7473_REG_TEMP_BASE_ADDR + (x))
+#define ADT7473_REG_TEMP_MIN(x) (ADT7473_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2))
+#define ADT7473_REG_TEMP_MAX(x) (ADT7473_REG_TEMP_LIMITS_BASE_ADDR + \
+				((x) * 2) + 1)
+#define ADT7473_REG_TEMP_TMIN(x)	(ADT7473_REG_TEMP_TMIN_BASE_ADDR + (x))
+#define ADT7473_REG_TEMP_TMAX(x)	(ADT7473_REG_TEMP_TMAX_BASE_ADDR + (x))
+
+#define ADT7473_FAN_COUNT	4
+#define ADT7473_REG_FAN(x)	(ADT7473_REG_FAN_BASE_ADDR + ((x) * 2))
+#define ADT7473_REG_FAN_MIN(x)	(ADT7473_REG_FAN_MIN_BASE_ADDR + ((x) * 2))
+
+#define ADT7473_PWM_COUNT	3
+#define ADT7473_REG_PWM(x)	(ADT7473_REG_PWM_BASE_ADDR + (x))
+#define ADT7473_REG_PWM_MAX(x)	(ADT7473_REG_PWM_MAX_BASE_ADDR + (x))
+#define ADT7473_REG_PWM_MIN(x)	(ADT7473_REG_PWM_MIN_BASE_ADDR + (x))
+#define ADT7473_REG_PWM_BHVR(x)	(ADT7473_REG_PWM_BHVR_BASE_ADDR + (x))
+
+/* How often do we reread sensors values? (In jiffies) */
+#define SENSOR_REFRESH_INTERVAL	(2 * HZ)
+
+/* How often do we reread sensor limit values? (In jiffies) */
+#define LIMIT_REFRESH_INTERVAL	(60 * HZ)
+
+/* datasheet says to divide this number by the fan reading to get fan rpm */
+#define FAN_PERIOD_TO_RPM(x)	((90000 * 60) / (x))
+#define FAN_RPM_TO_PERIOD	FAN_PERIOD_TO_RPM
+#define FAN_PERIOD_INVALID	65535
+#define FAN_DATA_VALID(x)	((x) && (x) != FAN_PERIOD_INVALID)
+
+struct adt7473_data {
+	struct i2c_client	client;
+	struct device		*hwmon_dev;
+	struct attribute_group	attrs;
+	struct mutex		lock;
+	char			sensors_valid;
+	char			limits_valid;
+	unsigned long		sensors_last_updated;	/* In jiffies */
+	unsigned long		limits_last_updated;	/* In jiffies */
+
+	u8			volt[ADT7473_VOLT_COUNT];
+	s8			volt_min[ADT7473_VOLT_COUNT];
+	s8			volt_max[ADT7473_VOLT_COUNT];
+
+	s8			temp[ADT7473_TEMP_COUNT];
+	s8			temp_min[ADT7473_TEMP_COUNT];
+	s8			temp_max[ADT7473_TEMP_COUNT];
+	s8			temp_tmin[ADT7473_TEMP_COUNT];
+	/* This is called the !THERM limit in the datasheet */
+	s8			temp_tmax[ADT7473_TEMP_COUNT];
+
+	u16			fan[ADT7473_FAN_COUNT];
+	u16			fan_min[ADT7473_FAN_COUNT];
+
+	u8			pwm[ADT7473_PWM_COUNT];
+	u8			pwm_max[ADT7473_PWM_COUNT];
+	u8			pwm_min[ADT7473_PWM_COUNT];
+	u8			pwm_behavior[ADT7473_PWM_COUNT];
+
+	u8			temp_twos_complement;
+	u8			temp_offset;
+
+	u16			alarm;
+	u8			max_duty_at_overheat;
+};
+
+static int adt7473_attach_adapter(struct i2c_adapter *adapter);
+static int adt7473_detect(struct i2c_adapter *adapter, int address, int kind);
+static int adt7473_detach_client(struct i2c_client *client);
+
+static struct i2c_driver adt7473_driver = {
+	.driver = {
+		.name	= "adt7473",
+	},
+	.attach_adapter	= adt7473_attach_adapter,
+	.detach_client	= adt7473_detach_client,
+};
+
+/*
+ * 16-bit registers on the ADT7473 are low-byte first.  The data sheet says
+ * that the low byte must be read before the high byte.
+ */
+static inline int adt7473_read_word_data(struct i2c_client *client, u8 reg)
+{
+	u16 foo;
+	foo = i2c_smbus_read_byte_data(client, reg);
+	foo |= ((u16)i2c_smbus_read_byte_data(client, reg + 1) << 8);
+	return foo;
+}
+
+static inline int adt7473_write_word_data(struct i2c_client *client, u8 reg,
+					  u16 value)
+{
+	return i2c_smbus_write_byte_data(client, reg, value & 0xFF)
+	       && i2c_smbus_write_byte_data(client, reg + 1, value >> 8);
+}
+
+static void adt7473_init_client(struct i2c_client *client)
+{
+	int reg = i2c_smbus_read_byte_data(client, ADT7473_REG_CFG1);
+
+	if (!(reg & ADT7473_CFG1_READY)) {
+		dev_err(&client->dev, "Chip not ready.\n");
+	} else {
+		/* start monitoring */
+		i2c_smbus_write_byte_data(client, ADT7473_REG_CFG1,
+					  reg | ADT7473_CFG1_START);
+	}
+}
+
+static struct adt7473_data *adt7473_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	unsigned long local_jiffies = jiffies;
+	u8 cfg;
+	int i;
+
+	mutex_lock(&data->lock);
+	if (time_before(local_jiffies, data->sensors_last_updated +
+		SENSOR_REFRESH_INTERVAL)
+		&& data->sensors_valid)
+		goto no_sensor_update;
+
+	for (i = 0; i < ADT7473_VOLT_COUNT; i++)
+		data->volt[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_VOLT(i));
+
+	/* Determine temperature encoding */
+	cfg = i2c_smbus_read_byte_data(client, ADT7473_REG_CFG5);
+	data->temp_twos_complement = (cfg & ADT7473_CFG5_TEMP_TWOS);
+
+	/*
+	 * What does this do? it implies a variable temperature sensor
+	 * offset, but the datasheet doesn't say anything about this bit
+	 * and other parts of the datasheet imply that "offset64" mode
+	 * means that you shift temp values by -64 if the above bit was set.
+	 */
+	data->temp_offset = (cfg & ADT7473_CFG5_TEMP_OFFSET);
+
+	for (i = 0; i < ADT7473_TEMP_COUNT; i++)
+		data->temp[i] = i2c_smbus_read_byte_data(client,
+							 ADT7473_REG_TEMP(i));
+
+	for (i = 0; i < ADT7473_FAN_COUNT; i++)
+		data->fan[i] = adt7473_read_word_data(client,
+						ADT7473_REG_FAN(i));
+
+	for (i = 0; i < ADT7473_PWM_COUNT; i++)
+		data->pwm[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_PWM(i));
+
+	data->alarm = i2c_smbus_read_byte_data(client, ADT7473_REG_ALARM1);
+	if (data->alarm & ADT7473_OOL)
+		data->alarm |= ALARM2(i2c_smbus_read_byte_data(client,
+							 ADT7473_REG_ALARM2));
+
+	data->sensors_last_updated = local_jiffies;
+	data->sensors_valid = 1;
+
+no_sensor_update:
+	if (time_before(local_jiffies, data->limits_last_updated +
+		LIMIT_REFRESH_INTERVAL)
+		&& data->limits_valid)
+		goto out;
+
+	for (i = 0; i < ADT7473_VOLT_COUNT; i++) {
+		data->volt_min[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_VOLT_MIN(i));
+		data->volt_max[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_VOLT_MAX(i));
+	}
+
+	for (i = 0; i < ADT7473_TEMP_COUNT; i++) {
+		data->temp_min[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_TEMP_MIN(i));
+		data->temp_max[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_TEMP_MAX(i));
+		data->temp_tmin[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_TEMP_TMIN(i));
+		data->temp_tmax[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_TEMP_TMAX(i));
+	}
+
+	for (i = 0; i < ADT7473_FAN_COUNT; i++)
+		data->fan_min[i] = adt7473_read_word_data(client,
+						ADT7473_REG_FAN_MIN(i));
+
+	for (i = 0; i < ADT7473_PWM_COUNT; i++) {
+		data->pwm_max[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_PWM_MAX(i));
+		data->pwm_min[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_PWM_MIN(i));
+		data->pwm_behavior[i] = i2c_smbus_read_byte_data(client,
+						ADT7473_REG_PWM_BHVR(i));
+	}
+
+	data->limits_last_updated = local_jiffies;
+	data->limits_valid = 1;
+
+out:
+	mutex_unlock(&data->lock);
+	return data;
+}
+
+/*
+ * On this chip, voltages are given as a count of steps between a minimum
+ * and maximum voltage, not a direct voltage.
+ */
+static const int volt_convert_table[][2] = {
+	{2997, 3},
+	{4395, 4},
+};
+
+static int decode_volt(int volt_index, u8 raw)
+{
+	int cmax = volt_convert_table[volt_index][0];
+	int cmin = volt_convert_table[volt_index][1];
+	return ((raw * (cmax - cmin)) / 255) + cmin;
+}
+
+static u8 encode_volt(int volt_index, int cooked)
+{
+	int cmax = volt_convert_table[volt_index][0];
+	int cmin = volt_convert_table[volt_index][1];
+	u8 x;
+
+	if (cooked > cmax)
+		cooked = cmax;
+	else if (cooked < cmin)
+		cooked = cmin;
+
+	x = ((cooked - cmin) * 255) / (cmax - cmin);
+
+	return x;
+}
+
+static ssize_t show_volt_min(struct device *dev,
+			     struct device_attribute *devattr,
+			     char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       decode_volt(attr->index, data->volt_min[attr->index]));
+}
+
+static ssize_t set_volt_min(struct device *dev,
+			    struct device_attribute *devattr,
+			    const char *buf,
+			    size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int volt = encode_volt(attr->index, simple_strtol(buf, NULL, 10));
+
+	mutex_lock(&data->lock);
+	data->volt_min[attr->index] = volt;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_VOLT_MIN(attr->index),
+				  volt);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_volt_max(struct device *dev,
+			     struct device_attribute *devattr,
+			     char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       decode_volt(attr->index, data->volt_max[attr->index]));
+}
+
+static ssize_t set_volt_max(struct device *dev,
+			    struct device_attribute *devattr,
+			    const char *buf,
+			    size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int volt = encode_volt(attr->index, simple_strtol(buf, NULL, 10));
+
+	mutex_lock(&data->lock);
+	data->volt_max[attr->index] = volt;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_VOLT_MAX(attr->index),
+				  volt);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_volt(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		       decode_volt(attr->index, data->volt[attr->index]));
+}
+
+/*
+ * This chip can report temperature data either as a two's complement
+ * number in the range -128 to 127, or as an unsigned number that must
+ * be offset by 64.
+ */
+static int decode_temp(struct adt7473_data *data, u8 raw)
+{
+	if (data->temp_twos_complement)
+		return (s8)raw;
+	return raw - 64;
+}
+
+static u8 encode_temp(struct adt7473_data *data, int cooked)
+{
+	if (data->temp_twos_complement)
+		return (cooked & 0xFF);
+	return cooked + 64;
+}
+
+static ssize_t show_temp_min(struct device *dev,
+			     struct device_attribute *devattr,
+			     char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       1000 * decode_temp(data, data->temp_min[attr->index]));
+}
+
+static ssize_t set_temp_min(struct device *dev,
+			    struct device_attribute *devattr,
+			    const char *buf,
+			    size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10) / 1000;
+	temp = encode_temp(data, temp);
+
+	mutex_lock(&data->lock);
+	data->temp_min[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_TEMP_MIN(attr->index),
+				  temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_temp_max(struct device *dev,
+			     struct device_attribute *devattr,
+			     char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       1000 * decode_temp(data, data->temp_max[attr->index]));
+}
+
+static ssize_t set_temp_max(struct device *dev,
+			    struct device_attribute *devattr,
+			    const char *buf,
+			    size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10) / 1000;
+	temp = encode_temp(data, temp);
+
+	mutex_lock(&data->lock);
+	data->temp_max[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_TEMP_MAX(attr->index),
+				  temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       1000 * decode_temp(data, data->temp[attr->index]));
+}
+
+static ssize_t show_fan_min(struct device *dev,
+			    struct device_attribute *devattr,
+			    char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+
+	if (FAN_DATA_VALID(data->fan_min[attr->index]))
+		return sprintf(buf, "%d\n",
+			       FAN_PERIOD_TO_RPM(data->fan_min[attr->index]));
+	else
+		return sprintf(buf, "0\n");
+}
+
+static ssize_t set_fan_min(struct device *dev,
+			   struct device_attribute *devattr,
+			   const char *buf, size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+
+	if (!temp)
+		return -EINVAL;
+	temp = FAN_RPM_TO_PERIOD(temp);
+
+	mutex_lock(&data->lock);
+	data->fan_min[attr->index] = temp;
+	adt7473_write_word_data(client, ADT7473_REG_FAN_MIN(attr->index), temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
+			char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+
+	if (FAN_DATA_VALID(data->fan[attr->index]))
+		return sprintf(buf, "%d\n",
+			       FAN_PERIOD_TO_RPM(data->fan[attr->index]));
+	else
+		return sprintf(buf, "0\n");
+}
+
+static ssize_t show_max_duty_at_crit(struct device *dev,
+				     struct device_attribute *devattr,
+				     char *buf)
+{
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n", data->max_duty_at_overheat);
+}
+
+static ssize_t set_max_duty_at_crit(struct device *dev,
+				    struct device_attribute *devattr,
+				    const char *buf,
+				    size_t count)
+{
+	u8 reg;
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+	temp = temp && 0xFF;
+
+	mutex_lock(&data->lock);
+	data->max_duty_at_overheat = temp;
+	reg = i2c_smbus_read_byte_data(client, ADT7473_REG_CFG4);
+	if (temp)
+		reg |= ADT7473_CFG4_MAX_DUTY_AT_OVT;
+	else
+		reg &= ~ADT7473_CFG4_MAX_DUTY_AT_OVT;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_CFG4, reg);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr,
+			char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n", data->pwm[attr->index]);
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
+			const char *buf, size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->lock);
+	data->pwm[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_PWM(attr->index), temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_pwm_max(struct device *dev,
+			    struct device_attribute *devattr,
+			    char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n", data->pwm_max[attr->index]);
+}
+
+static ssize_t set_pwm_max(struct device *dev,
+			   struct device_attribute *devattr,
+			   const char *buf,
+			   size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->lock);
+	data->pwm_max[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_PWM_MAX(attr->index),
+				  temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_pwm_min(struct device *dev,
+			    struct device_attribute *devattr,
+			    char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n", data->pwm_min[attr->index]);
+}
+
+static ssize_t set_pwm_min(struct device *dev,
+			   struct device_attribute *devattr,
+			   const char *buf,
+			   size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->lock);
+	data->pwm_min[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_PWM_MIN(attr->index),
+				  temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_temp_tmax(struct device *dev,
+			      struct device_attribute *devattr,
+			      char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       1000 * decode_temp(data, data->temp_tmax[attr->index]));
+}
+
+static ssize_t set_temp_tmax(struct device *dev,
+			     struct device_attribute *devattr,
+			     const char *buf,
+			     size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10) / 1000;
+	temp = encode_temp(data, temp);
+
+	mutex_lock(&data->lock);
+	data->temp_tmax[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_TEMP_TMAX(attr->index),
+				  temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_temp_tmin(struct device *dev,
+			      struct device_attribute *devattr,
+			      char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	return sprintf(buf, "%d\n",
+		       1000 * decode_temp(data, data->temp_tmin[attr->index]));
+}
+
+static ssize_t set_temp_tmin(struct device *dev,
+			     struct device_attribute *devattr,
+			     const char *buf,
+			     size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10) / 1000;
+	temp = encode_temp(data, temp);
+
+	mutex_lock(&data->lock);
+	data->temp_tmin[attr->index] = temp;
+	i2c_smbus_write_byte_data(client, ADT7473_REG_TEMP_TMIN(attr->index),
+				  temp);
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_pwm_enable(struct device *dev,
+			       struct device_attribute *devattr,
+			       char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+
+	switch (data->pwm_behavior[attr->index] >> ADT7473_PWM_BHVR_SHIFT) {
+	case 3:
+		return sprintf(buf, "0\n");
+	case 7:
+		return sprintf(buf, "1\n");
+	default:
+		return sprintf(buf, "2\n");
+	}
+}
+
+static ssize_t set_pwm_enable(struct device *dev,
+			      struct device_attribute *devattr,
+			      const char *buf,
+			      size_t count)
+{
+	u8 reg;
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+
+	switch (temp) {
+	case 0:
+		temp = 3;
+		break;
+	case 1:
+		temp = 7;
+		break;
+	case 2:
+		/* Enter automatic mode with fans off */
+		temp = 4;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->lock);
+	reg = i2c_smbus_read_byte_data(client,
+				       ADT7473_REG_PWM_BHVR(attr->index));
+	reg = (temp << ADT7473_PWM_BHVR_SHIFT) |
+	      (reg & ~ADT7473_PWM_BHVR_MASK);
+	i2c_smbus_write_byte_data(client, ADT7473_REG_PWM_BHVR(attr->index),
+				  reg);
+	data->pwm_behavior[attr->index] = reg;
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_pwm_auto_temp(struct device *dev,
+				  struct device_attribute *devattr,
+				  char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+	int bhvr = data->pwm_behavior[attr->index] >> ADT7473_PWM_BHVR_SHIFT;
+
+	switch (bhvr) {
+	case 3:
+	case 4:
+	case 7:
+		return sprintf(buf, "0\n");
+	case 0:
+	case 1:
+	case 5:
+	case 6:
+		return sprintf(buf, "%d\n", bhvr + 1);
+	case 2:
+		return sprintf(buf, "4\n");
+	}
+	/* shouldn't ever get here */
+	BUG();
+}
+
+static ssize_t set_pwm_auto_temp(struct device *dev,
+				 struct device_attribute *devattr,
+				 const char *buf,
+				 size_t count)
+{
+	u8 reg;
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adt7473_data *data = i2c_get_clientdata(client);
+	int temp = simple_strtol(buf, NULL, 10);
+
+	switch (temp) {
+	case 1:
+	case 2:
+	case 6:
+	case 7:
+		temp--;
+		break;
+	case 0:
+		temp = 4;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->lock);
+	reg = i2c_smbus_read_byte_data(client,
+				       ADT7473_REG_PWM_BHVR(attr->index));
+	reg = (temp << ADT7473_PWM_BHVR_SHIFT) |
+	      (reg & ~ADT7473_PWM_BHVR_MASK);
+	i2c_smbus_write_byte_data(client, ADT7473_REG_PWM_BHVR(attr->index),
+				  reg);
+	data->pwm_behavior[attr->index] = reg;
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static ssize_t show_alarm(struct device *dev,
+			  struct device_attribute *devattr,
+			  char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct adt7473_data *data = adt7473_update_device(dev);
+
+	if (data->alarm & attr->index)
+		return sprintf(buf, "1\n");
+	else
+		return sprintf(buf, "0\n");
+}
+
+
+static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_volt_max,
+			  set_volt_max, 0);
+static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_volt_max,
+			  set_volt_max, 1);
+
+static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_volt_min,
+			  set_volt_min, 0);
+static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_volt_min,
+			  set_volt_min, 1);
+
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_volt, NULL, 0);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_volt, NULL, 1);
+
+static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL,
+			  ADT7473_VCCP_ALARM);
+static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL,
+			  ADT7473_VCC_ALARM);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
+			  set_temp_max, 0);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
+			  set_temp_max, 1);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp_max,
+			  set_temp_max, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
+			  set_temp_min, 0);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
+			  set_temp_min, 1);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_temp_min,
+			  set_temp_min, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL,
+			  ADT7473_R1T_ALARM | ALARM2(ADT7473_R1T_SHORT));
+static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL,
+			  ADT7473_LT_ALARM);
+static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL,
+			  ADT7473_R2T_ALARM | ALARM2(ADT7473_R2T_SHORT));
+
+static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
+			  set_fan_min, 0);
+static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
+			  set_fan_min, 1);
+static SENSOR_DEVICE_ATTR(fan3_min, S_IWUSR | S_IRUGO, show_fan_min,
+			  set_fan_min, 2);
+static SENSOR_DEVICE_ATTR(fan4_min, S_IWUSR | S_IRUGO, show_fan_min,
+			  set_fan_min, 3);
+
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
+
+static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL,
+			  ALARM2(ADT7473_FAN1_ALARM));
+static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL,
+			  ALARM2(ADT7473_FAN2_ALARM));
+static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL,
+			  ALARM2(ADT7473_FAN3_ALARM));
+static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL,
+			  ALARM2(ADT7473_FAN4_ALARM));
+
+static SENSOR_DEVICE_ATTR(pwm_use_point2_pwm_at_crit, S_IWUSR | S_IRUGO,
+			  show_max_duty_at_crit, set_max_duty_at_crit, 0);
+
+static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
+static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
+static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2);
+
+static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IWUSR | S_IRUGO,
+			  show_pwm_min, set_pwm_min, 0);
+static SENSOR_DEVICE_ATTR(pwm2_auto_point1_pwm, S_IWUSR | S_IRUGO,
+			  show_pwm_min, set_pwm_min, 1);
+static SENSOR_DEVICE_ATTR(pwm3_auto_point1_pwm, S_IWUSR | S_IRUGO,
+			  show_pwm_min, set_pwm_min, 2);
+
+static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
+			  show_pwm_max, set_pwm_max, 0);
+static SENSOR_DEVICE_ATTR(pwm2_auto_point2_pwm, S_IWUSR | S_IRUGO,
+			  show_pwm_max, set_pwm_max, 1);
+static SENSOR_DEVICE_ATTR(pwm3_auto_point2_pwm, S_IWUSR | S_IRUGO,
+			  show_pwm_max, set_pwm_max, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp, S_IWUSR | S_IRUGO,
+			  show_temp_tmin, set_temp_tmin, 0);
+static SENSOR_DEVICE_ATTR(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
+			  show_temp_tmin, set_temp_tmin, 1);
+static SENSOR_DEVICE_ATTR(temp3_auto_point1_temp, S_IWUSR | S_IRUGO,
+			  show_temp_tmin, set_temp_tmin, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
+			  show_temp_tmax, set_temp_tmax, 0);
+static SENSOR_DEVICE_ATTR(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
+			  show_temp_tmax, set_temp_tmax, 1);
+static SENSOR_DEVICE_ATTR(temp3_auto_point2_temp, S_IWUSR | S_IRUGO,
+			  show_temp_tmax, set_temp_tmax, 2);
+
+static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
+			  set_pwm_enable, 0);
+static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
+			  set_pwm_enable, 1);
+static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
+			  set_pwm_enable, 2);
+
+static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IWUSR | S_IRUGO,
+			  show_pwm_auto_temp, set_pwm_auto_temp, 0);
+static SENSOR_DEVICE_ATTR(pwm2_auto_channels_temp, S_IWUSR | S_IRUGO,
+			  show_pwm_auto_temp, set_pwm_auto_temp, 1);
+static SENSOR_DEVICE_ATTR(pwm3_auto_channels_temp, S_IWUSR | S_IRUGO,
+			  show_pwm_auto_temp, set_pwm_auto_temp, 2);
+
+static struct attribute *adt7473_attr[] =
+{
+	&sensor_dev_attr_in1_max.dev_attr.attr,
+	&sensor_dev_attr_in2_max.dev_attr.attr,
+	&sensor_dev_attr_in1_min.dev_attr.attr,
+	&sensor_dev_attr_in2_min.dev_attr.attr,
+	&sensor_dev_attr_in1_input.dev_attr.attr,
+	&sensor_dev_attr_in2_input.dev_attr.attr,
+	&sensor_dev_attr_in1_alarm.dev_attr.attr,
+	&sensor_dev_attr_in2_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp2_max.dev_attr.attr,
+	&sensor_dev_attr_temp3_max.dev_attr.attr,
+	&sensor_dev_attr_temp1_min.dev_attr.attr,
+	&sensor_dev_attr_temp2_min.dev_attr.attr,
+	&sensor_dev_attr_temp3_min.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp3_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_temp3_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
+	&sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
+	&sensor_dev_attr_temp3_auto_point2_temp.dev_attr.attr,
+
+	&sensor_dev_attr_fan1_min.dev_attr.attr,
+	&sensor_dev_attr_fan2_min.dev_attr.attr,
+	&sensor_dev_attr_fan3_min.dev_attr.attr,
+	&sensor_dev_attr_fan4_min.dev_attr.attr,
+	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&sensor_dev_attr_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan3_input.dev_attr.attr,
+	&sensor_dev_attr_fan4_input.dev_attr.attr,
+	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan4_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_pwm_use_point2_pwm_at_crit.dev_attr.attr,
+
+	&sensor_dev_attr_pwm1.dev_attr.attr,
+	&sensor_dev_attr_pwm2.dev_attr.attr,
+	&sensor_dev_attr_pwm3.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
+
+	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
+	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
+	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
+
+	NULL
+};
+
+static int adt7473_attach_adapter(struct i2c_adapter *adapter)
+{
+	if (!(adapter->class & I2C_CLASS_HWMON))
+		return 0;
+	return i2c_probe(adapter, &addr_data, adt7473_detect);
+}
+
+static int adt7473_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *client;
+	struct adt7473_data *data;
+	int err = 0;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		goto exit;
+
+	data = kzalloc(sizeof(struct adt7473_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	client = &data->client;
+	client->addr = address;
+	client->adapter = adapter;
+	client->driver = &adt7473_driver;
+
+	i2c_set_clientdata(client, data);
+
+	mutex_init(&data->lock);
+
+	if (kind <= 0) {
+		int vendor, device, revision;
+
+		vendor = i2c_smbus_read_byte_data(client, ADT7473_REG_VENDOR);
+		if (vendor != ADT7473_VENDOR) {
+			err = -ENODEV;
+			goto exit_free;
+		}
+
+		device = i2c_smbus_read_byte_data(client, ADT7473_REG_DEVICE);
+		if (device != ADT7473_DEVICE) {
+			err = -ENODEV;
+			goto exit_free;
+		}
+
+		revision = i2c_smbus_read_byte_data(client,
+						    ADT7473_REG_REVISION);
+		if (revision != ADT7473_REV_68 && revision != ADT7473_REV_69) {
+			err = -ENODEV;
+			goto exit_free;
+		}
+	} else
+		dev_dbg(&adapter->dev, "detection forced\n");
+
+	strlcpy(client->name, "adt7473", I2C_NAME_SIZE);
+
+	err = i2c_attach_client(client);
+	if (err)
+		goto exit_free;
+
+	dev_info(&client->dev, "%s chip found\n", client->name);
+
+	/* Initialize the ADT7473 chip */
+	adt7473_init_client(client);
+
+	/* Register sysfs hooks */
+	data->attrs.attrs = adt7473_attr;
+	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
+	if (err)
+		goto exit_detach;
+
+	data->hwmon_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		goto exit_remove;
+	}
+
+	return 0;
+
+exit_remove:
+	sysfs_remove_group(&client->dev.kobj, &data->attrs);
+exit_detach:
+	i2c_detach_client(client);
+exit_free:
+	kfree(data);
+exit:
+	return err;
+}
+
+static int adt7473_detach_client(struct i2c_client *client)
+{
+	struct adt7473_data *data = i2c_get_clientdata(client);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	sysfs_remove_group(&client->dev.kobj, &data->attrs);
+	i2c_detach_client(client);
+	kfree(data);
+	return 0;
+}
+
+static int __init adt7473_init(void)
+{
+	return i2c_add_driver(&adt7473_driver);
+}
+
+static void __exit adt7473_exit(void)
+{
+	i2c_del_driver(&adt7473_driver);
+}
+
+MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
+MODULE_DESCRIPTION("ADT7473 driver");
+MODULE_LICENSE("GPL");
+
+module_init(adt7473_init);
+module_exit(adt7473_exit);