[PATCH v4 3/6] Add Advantech iManager HWmon driver

[Richard Vidal-Dorsch]

Signed-off-by: Richard Vidal-Dorsch <richard.dorsch@xxxxxxxxx>
---
 drivers/hwmon/Kconfig          |   11 +
 drivers/hwmon/Makefile         |    1 +
 drivers/hwmon/imanager-hwmon.c | 1226 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1238 insertions(+)
 create mode 100644 drivers/hwmon/imanager-hwmon.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 45cef3d..7a9db12 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -625,6 +625,17 @@ config SENSORS_CORETEMP
 	  sensor inside your CPU. Most of the family 6 CPUs
 	  are supported. Check Documentation/hwmon/coretemp for details.
 
+config SENSORS_IMANAGER
+	tristate "Advantech iManager Hardware Monitoring"
+	depends on MFD_IMANAGER
+	select HWMON_VID
+	help
+	  This enables support for Advantech iManager hardware monitoring
+	  of some Advantech SOM, MIO, AIMB, and PCM modules/boards.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called imanager-hwmon.
+
 config SENSORS_IT87
 	tristate "ITE IT87xx and compatibles"
 	depends on !PPC
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index aecf4ba..3f489ae 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_SENSORS_IBMAEM)	+= ibmaem.o
 obj-$(CONFIG_SENSORS_IBMPEX)	+= ibmpex.o
 obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
 obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o
+obj-$(CONFIG_SENSORS_IMANAGER)	+= imanager-hwmon.o
 obj-$(CONFIG_SENSORS_INA209)	+= ina209.o
 obj-$(CONFIG_SENSORS_INA2XX)	+= ina2xx.o
 obj-$(CONFIG_SENSORS_INA3221)	+= ina3221.o
diff --git a/drivers/hwmon/imanager-hwmon.c b/drivers/hwmon/imanager-hwmon.c
new file mode 100644
index 0000000..af72c35
--- /dev/null
+++ b/drivers/hwmon/imanager-hwmon.c
@@ -0,0 +1,1226 @@
+/*
+ * Advantech iManager Hardware Monitoring driver
+ * Partially derived from nct6775
+ *
+ * Copyright (C) 2016 Advantech Co., Ltd.
+ * Author: Richard Vidal-Dorsch <richard.dorsch@xxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/bitops.h>
+#include <linux/byteorder/generic.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon-vid.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/mfd/imanager.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+/* Voltage computation (10-bit ADC, 0..3V input) */
+#define SCALE_IN			2933 /* (3000mV / (2^10 - 1)) * 1000 */
+
+#define HWM_STATUS_UNDEFINED_ITEM	2UL
+#define HWM_STATUS_UNDEFINED_DID	3UL
+#define HWM_STATUS_UNDEFINED_HWPIN	4UL
+
+/* iManager EC FW pwm[1-*]_mode values are switched */
+enum imanager_pwm_mode { CTRL_PWM, CTRL_RPM };
+/* EC FW defines pwm_enable mode 'full speed' besides mode 'off' */
+enum imanager_pwm_enable { MODE_OFF, MODE_FULL, MODE_MANUAL, MODE_AUTO };
+
+/*
+ * iManager FAN device defs
+ */
+struct fan_dev_config {
+	u8	did,
+		hwpin,
+		tachoid,
+		status,
+		control,
+		temp_max,
+		temp_min,
+		temp_stop,
+		pwm_max,
+		pwm_min;
+	u16	rpm_max;
+	u16	rpm_min;
+	u8	debounce;	/* debounce time, not used */
+	u8	temp;		/* Current Thermal Zone Temperature */
+	u16	rpm_target;	/* RPM Target Speed, not used */
+} __attribute__((__packed__));
+
+struct fan_alert_limit {
+	u16	min,
+		max;
+} __attribute__((__packed__));
+
+struct fan_status {
+	u32	sysctl	: 1,	/* System Control flag */
+		tacho	: 1,	/* FAN tacho source defined */
+		pulse	: 1,	/* FAN pulse type defined */
+		thermal	: 1,	/* Thermal zone init */
+		i2clink	: 1,	/* I2C protocol fail flag (thermal sensor) */
+		dnc	: 1,	/* don't care */
+		mode	: 2;	/* FAN Control mode */
+};
+
+/**
+ * FAN Control bit field
+ * enable:   0:Disabled, 1:Enabled
+ * type:     0:PWM,      1:RPM
+ * pulse:    0:Undefined 1:2 Pulses  2:4 Pulses
+ * tacho:    1:CPU FAN,  2:SYS FAN1, 3:SYS FAN2
+ * mode:     0:Off,      1:Full,     2:Manual, 3:Auto
+ */
+struct fan_ctrl {
+	u32	enable	: 1,	/* SmartFAN control on/off */
+		type	: 1,	/* FAN control type [0, 1] PWM/RPM */
+		pulse	: 2,	/* FAN pulse [0..2] */
+		tacho	: 2,	/* FAN Tacho Input [1..3] */
+		mode	: 2;	/* off/full/manual/auto */
+};
+
+/* Default Voltage Sensors */
+struct imanager_hwmon_adc {
+	bool valid; /* if set, below values are valid */
+	unsigned int value;
+	unsigned int min;
+	unsigned int max;
+	unsigned int average;
+	unsigned int lowest;
+	unsigned int highest;
+};
+
+struct imanager_hwmon_smartfan {
+	bool valid; /* if set, below values are valid */
+	unsigned int pwm;
+	unsigned int speed;
+	bool speed_min_alarm;
+	bool speed_max_alarm;
+	struct fan_dev_config cfg;
+};
+
+struct imanager_hwmon_data {
+	struct imanager_device_data	*imgr;
+	const struct attribute_group	*groups[3];
+	unsigned long			samples;
+	unsigned long			last_updated;
+	struct imanager_hwmon_adc	adc[EC_MAX_ADC_NUM];
+	struct imanager_hwmon_smartfan	fan[EC_MAX_FAN_NUM];
+};
+
+static int imanager_hwmon_read_fan_config(struct imanager_ec_data *ec, int num,
+					  struct imanager_hwmon_smartfan *fan)
+{
+	struct imanager_ec_message msg = {
+		IMANAGER_MSG_SIMPLE(EC_F_HWMON_MSG, 0, num, (u8 *)&fan->cfg)
+	};
+	int ret;
+
+	ret = imanager_read(ec, EC_CMD_FAN_CTL_RD, &msg);
+	if (ret)
+		return ret;
+
+	return fan->cfg.did ? 0 : -ENODEV;
+}
+
+static int
+imanager_hwmon_write_fan_config(struct imanager_ec_data *ec, int num,
+				struct imanager_hwmon_smartfan *fan)
+{
+	struct imanager_ec_message msg = {
+		IMANAGER_MSG_SIMPLE(0, sizeof(fan->cfg), num, (u8 *)&fan->cfg)
+	};
+	int err;
+
+	err = imanager_write(ec, EC_CMD_FAN_CTL_WR, &msg);
+	if (err < 0) {
+		return err;
+	} else if (err) {
+		switch (err) {
+		case HWM_STATUS_UNDEFINED_ITEM:
+		case HWM_STATUS_UNDEFINED_DID:
+		case HWM_STATUS_UNDEFINED_HWPIN:
+			return -ENODEV;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * FAN max/min alert bits are stored as bit pairs in a 8-bit register.
+ * FAN0~2: 2:{max2, min2}, 1:{max1, min1}, 0:{max0, min0}
+ */
+#define IS_FAN_ALERT_MIN(fan_num, var) test_bit(BIT((fan_num) << 1), var)
+#define IS_FAN_ALERT_MAX(fan_num, var) test_bit(BIT(((fan_num) << 1) + 1), var)
+
+static int imanager_hwmon_read_fan_alert(struct imanager_ec_data *ec, int num,
+					 struct imanager_hwmon_smartfan *fan)
+{
+	const ulong alert_flags = 0;
+	int ret;
+
+	ret = imanager_read_ram(ec, EC_RAM_ACPI, EC_OFFSET_FAN_ALERT,
+				(u8 *)&alert_flags, sizeof(u8));
+	if (ret < 0)
+		return ret;
+
+	fan->speed_min_alarm = IS_FAN_ALERT_MIN(num, &alert_flags);
+	fan->speed_max_alarm = IS_FAN_ALERT_MAX(num, &alert_flags);
+
+	return 0;
+}
+
+static int imanager_hwmon_write_fan_alert(struct imanager_ec_data *ec, int fnum,
+					  struct imanager_hwmon_smartfan *fan)
+{
+	struct fan_alert_limit limits[EC_MAX_FAN_NUM];
+	struct fan_alert_limit *limit = &limits[fnum];
+	int ret;
+
+	ret = imanager_read_ram(ec, EC_RAM_ACPI, EC_OFFSET_FAN_ALERT_LIMIT,
+				(u8 *)limits, sizeof(limits));
+	if (ret < 0)
+		return ret;
+
+	limit->min = fan->cfg.rpm_min;
+	limit->max = fan->cfg.rpm_max;
+
+	return imanager_write_ram(ec, EC_RAM_ACPI, EC_OFFSET_FAN_ALERT_LIMIT,
+				  (u8 *)limits, sizeof(limits));
+}
+
+static int imanager_hwmon_read_adc(struct imanager_ec_data *ec, int num,
+				   struct imanager_hwmon_adc *adc)
+{
+	struct imanager_device_attribute *attr = ec->hwmon.adc.attr[num];
+	int ret;
+
+	adc->valid = false;
+
+	ret = imanager_read16(ec, EC_CMD_HWP_RD, attr->did);
+	if (ret < 0)
+		return ret;
+
+	adc->value = ret * attr->ecdev->scale;
+	adc->valid = true;
+
+	return 0;
+}
+
+static int imanager_hwmon_read_fan_ctrl(struct imanager_ec_data *ec, int num,
+					struct imanager_hwmon_smartfan *fan)
+{
+	struct imanager_device_attribute *attr = ec->hwmon.adc.attr[num];
+
+	int ret;
+
+	fan->valid = false;
+
+	ret = imanager_hwmon_read_fan_config(ec, num, fan);
+	if (ret < 0)
+		return ret;
+
+	ret = imanager_read16(ec, EC_CMD_HWP_RD, fan->cfg.tachoid);
+	if (ret < 0)
+		return ret;
+
+	fan->speed = ret;
+
+	ret = imanager_read8(ec, EC_CMD_HWP_RD, attr->did);
+	if (ret < 0)
+		return ret;
+
+	fan->pwm = ret;
+
+	ret = imanager_hwmon_read_fan_alert(ec, num, fan);
+	if (ret)
+		return ret;
+
+	fan->valid = true;
+
+	return 0;
+}
+
+static inline uint in_from_reg(u16 val)
+{
+	return clamp_val(DIV_ROUND_CLOSEST(val * SCALE_IN, 1000), 0, 65535);
+}
+
+static inline u16 in_to_reg(uint val)
+{
+	return clamp_val(DIV_ROUND_CLOSEST(val * 1000, SCALE_IN), 0, 65535);
+}
+
+static struct imanager_hwmon_data *
+imanager_hwmon_update_device(struct device *dev)
+{
+	struct imanager_hwmon_data *data = dev_get_drvdata(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	struct imanager_ec_data *ec = &imgr->ec;
+	struct imanager_hwmon_device *hwmon = &ec->hwmon;
+	int i;
+
+	mutex_lock(&imgr->lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)) {
+		/* Measured voltages */
+		for (i = 0; i < hwmon->adc.num; i++)
+			imanager_hwmon_read_adc(ec, i, &data->adc[i]);
+
+		/* Measured fan speeds */
+		for (i = 0; i < hwmon->fan.num; i++)
+			imanager_hwmon_read_fan_ctrl(ec, i, &data->fan[i]);
+
+		data->last_updated = jiffies;
+	}
+
+	mutex_unlock(&imgr->lock);
+
+	return data;
+}
+
+static ssize_t
+show_in(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+
+	return sprintf(buf, "%u\n", in_from_reg(data->adc[nr].value));
+}
+
+static ssize_t
+show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+
+	return sprintf(buf, "%u\n", in_from_reg(data->adc[nr].min));
+}
+
+static ssize_t
+show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+
+	return sprintf(buf, "%u\n", in_from_reg(data->adc[nr].max));
+}
+
+static ssize_t
+store_in_min(struct device *dev, struct device_attribute *attr,
+	     const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	data->adc[nr].min = in_to_reg(val);
+
+	return count;
+}
+
+static ssize_t
+store_in_max(struct device *dev, struct device_attribute *attr,
+	     const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	data->adc[nr].max = in_to_reg(val);
+
+	return count;
+}
+
+static ssize_t
+show_in_alarm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct imanager_hwmon_adc *adc = &data->adc[nr];
+	int val = 0;
+
+	if (adc->valid)
+		val = (adc->value < adc->min) || (adc->value > adc->max);
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t
+show_in_average(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct imanager_hwmon_adc *adc = &data->adc[nr];
+
+	if (adc->average) {
+		adc->average = DIV_ROUND_CLOSEST(adc->average * data->samples +
+						 adc->value, ++data->samples);
+	} else {
+		adc->average = adc->value;
+		data->samples = 1;
+	}
+
+	return sprintf(buf, "%u\n", in_from_reg(adc->average));
+}
+
+static ssize_t
+show_in_lowest(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct imanager_hwmon_adc *adc = &data->adc[nr];
+
+	if (!adc->lowest || (adc->value < adc->lowest))
+		adc->lowest = adc->value;
+
+	return sprintf(buf, "%u\n", in_from_reg(adc->lowest));
+}
+
+static ssize_t
+show_in_highest(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	struct imanager_hwmon_adc *adc = &data->adc[nr];
+
+	if (!adc->highest || (adc->value > adc->highest))
+		adc->highest = adc->value;
+
+	return sprintf(buf, "%u\n", in_from_reg(adc->highest));
+}
+
+static ssize_t
+store_in_reset_history(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index;
+	unsigned long reset;
+	int err;
+
+	err = kstrtoul(buf, 10, &reset);
+	if (err < 0)
+		return err;
+
+	if (reset) {
+		data->adc[nr].lowest = 0;
+		data->adc[nr].highest = 0;
+		data->adc[nr].average = 0;
+		data->samples = 0;
+	}
+
+	return count;
+}
+
+static ssize_t
+show_temp(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%u\n", data->fan[nr].cfg.temp * 1000);
+}
+
+static ssize_t
+show_fan_in(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+
+	return sprintf(buf, "%u\n", fan->valid ? fan->speed : 0);
+}
+
+static inline int check_fan_alarm(const struct imanager_hwmon_smartfan *fan)
+{
+	int rpm_min = cpu_to_be16(fan->cfg.rpm_min);
+	int rpm_max = cpu_to_be16(fan->cfg.rpm_max);
+
+	return !fan->valid || fan->speed_min_alarm || fan->speed_max_alarm ||
+	       (!fan->speed && fan->pwm) || (fan->speed < rpm_min) ||
+	       (fan->speed > rpm_max);
+}
+
+static ssize_t
+show_fan_alarm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	bool is_alarm = (ctrl->mode == MODE_AUTO) ? 0 : check_fan_alarm(fan);
+
+	return sprintf(buf, "%u\n", is_alarm);
+}
+
+static ssize_t
+show_fan_min(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	int rpm_min = cpu_to_be16(data->fan[nr].cfg.rpm_min);
+
+	return sprintf(buf, "%u\n", rpm_min);
+}
+
+static ssize_t
+show_fan_max(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	int rpm_max = cpu_to_be16(data->fan[nr].cfg.rpm_max);
+
+	return sprintf(buf, "%u\n", rpm_max);
+}
+
+static ssize_t
+store_fan_min(struct device *dev, struct device_attribute *attr,
+	      const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_device_data *imgr = data->imgr;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	unsigned long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	/* do not apply value if not in cruise mode */
+	if (ctrl->mode != MODE_AUTO)
+		return count;
+
+	mutex_lock(&imgr->lock);
+	fan->cfg.rpm_min = cpu_to_be16(val);
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+store_fan_max(struct device *dev, struct device_attribute *attr,
+	      const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_device_data *imgr = data->imgr;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	unsigned long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	/* do not apply value if not in cruise mode */
+	if (ctrl->mode != MODE_AUTO)
+		return count;
+
+	mutex_lock(&imgr->lock);
+	fan->cfg.rpm_max = cpu_to_be16(val);
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	u32 val = DIV_ROUND_CLOSEST(data->fan[nr].pwm * 255, 100);
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t
+store_pwm(struct device *dev, struct device_attribute *attr,
+	  const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_device_data *imgr = data->imgr;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	int did = imgr->ec.hwmon.fan.attr[nr]->did;
+	unsigned long pwm = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &pwm);
+	if (err < 0)
+		return err;
+
+	pwm = DIV_ROUND_CLOSEST(pwm * 100, 255);
+
+	mutex_lock(&imgr->lock);
+
+	if (ctrl->mode == MODE_MANUAL) {
+		ctrl->type = CTRL_PWM;
+		ctrl->pulse = 0;
+		ctrl->enable = 1;
+		imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+		imanager_write8(&imgr->ec, EC_CMD_HWP_WR, did, pwm);
+	} else if ((ctrl->mode == MODE_AUTO) && (ctrl->type == CTRL_PWM)) {
+		ctrl->pulse = 0;
+		ctrl->enable = 1;
+		fan->cfg.rpm_min = 0;
+		fan->cfg.rpm_max = 0;
+		imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+		imanager_write8(&imgr->ec, EC_CMD_HWP_WR, did, pwm);
+		imanager_hwmon_write_fan_alert(&imgr->ec, nr, fan);
+	}
+
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+show_pwm_min(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%u\n", data->fan[nr].cfg.pwm_min);
+}
+
+static ssize_t
+show_pwm_max(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%u\n", data->fan[nr].cfg.pwm_max);
+}
+
+static ssize_t
+show_pwm_enable(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	uint mode = ctrl->mode - 1;
+
+	if (ctrl->mode == MODE_OFF)
+		mode = 0;
+
+	return sprintf(buf, "%u\n", mode);
+}
+
+enum pwm_enable { OFF, MANUAL, THERMAL_CRUISE };
+
+static ssize_t
+store_pwm_enable(struct device *dev, struct device_attribute *attr,
+		 const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	int did = imgr->ec.hwmon.fan.attr[nr]->did;
+	unsigned long mode = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &mode);
+	if (err < 0)
+		return err;
+
+	mutex_lock(&imgr->lock);
+
+	switch (mode) {
+	case OFF:
+		ctrl->mode = MODE_FULL;
+		ctrl->type = CTRL_PWM;
+		ctrl->enable = 1;
+		imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+		imanager_write8(&imgr->ec, EC_CMD_HWP_WR, did, 100);
+		break;
+	case MANUAL:
+		ctrl->mode = MODE_MANUAL;
+		ctrl->type = CTRL_PWM;
+		ctrl->enable = 1;
+		imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+		imanager_write8(&imgr->ec, EC_CMD_HWP_WR, did, 0);
+		break;
+	case THERMAL_CRUISE:
+		ctrl->mode = MODE_AUTO;
+		ctrl->enable = 1;
+		imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+		imanager_write8(&imgr->ec, EC_CMD_HWP_WR, did, 0);
+		break;
+	}
+
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	uint mode = (ctrl->type == CTRL_PWM) ? 1 : 0;
+
+	if (ctrl->mode == MODE_OFF)
+		mode = 0;
+
+	return sprintf(buf, "%u\n", mode);
+}
+
+static ssize_t
+store_pwm_mode(struct device *dev, struct device_attribute *attr,
+	       const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	unsigned long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	if (ctrl->mode != MODE_AUTO)
+		return count;
+
+	mutex_lock(&imgr->lock);
+	ctrl->type = val ? CTRL_RPM : CTRL_PWM;
+	ctrl->enable = 1;
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%d\n", data->fan[nr].cfg.temp_min * 1000);
+}
+
+static ssize_t
+show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%u\n", data->fan[nr].cfg.temp_max * 1000);
+}
+
+static inline bool is_outside(int min, int max, int value)
+{
+	return (value < min) || (value > max);
+}
+
+static ssize_t
+show_temp_alarm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct fan_dev_config *cfg = &data->fan[nr].cfg;
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&cfg->control;
+	bool is_alarm = (ctrl->mode == MODE_AUTO) ? 0 :
+			is_outside(cfg->temp_min, cfg->temp_max, cfg->temp);
+
+	return sprintf(buf, "%u\n", is_alarm);
+}
+
+static ssize_t store_temp_min(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	/* temperature in 1/10 degC */
+	val = DIV_ROUND_CLOSEST(val, 1000);
+	val = val > 100 ? 100 : val;
+
+	/* do not apply value if not in cruise mode */
+	if (ctrl->mode != MODE_AUTO)
+		return count;
+
+	/*
+	 * The iManager provides three different temperature limit values
+	 * (stop, min, and max) where stop indicates a minimum temp value
+	 * (threshold) from which the FAN will turn off.  We are setting
+	 * temp_stop to the same value as temp_min since it cannot be mapped
+	 * to anything else.
+	 */
+
+	mutex_lock(&imgr->lock);
+	fan->cfg.temp_stop = val;
+	fan->cfg.temp_min = val;
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+store_temp_max(struct device *dev, struct device_attribute *attr,
+	       const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	struct fan_ctrl *ctrl = (struct fan_ctrl *)&fan->cfg.control;
+	long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	val = DIV_ROUND_CLOSEST(val, 1000);
+	val = val > 100 ? 100 : val;
+
+	/* do not apply value if not in cruise mode */
+	if (ctrl->mode != MODE_AUTO)
+		return count;
+
+	mutex_lock(&imgr->lock);
+	fan->cfg.temp_max = val;
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+store_pwm_min(struct device *dev, struct device_attribute *attr,
+	      const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	val = DIV_ROUND_CLOSEST(val * 100, 255);
+
+	mutex_lock(&imgr->lock);
+	fan->cfg.pwm_min = val;
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+store_pwm_max(struct device *dev, struct device_attribute *attr,
+	      const char *buf, size_t count)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_device_data *imgr = data->imgr;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+	struct imanager_hwmon_smartfan *fan = &data->fan[nr];
+	long val = 0;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	val = DIV_ROUND_CLOSEST(val * 100, 255);
+
+	mutex_lock(&imgr->lock);
+	fan->cfg.pwm_max = val;
+	imanager_hwmon_write_fan_config(&imgr->ec, nr, fan);
+	mutex_unlock(&imgr->lock);
+
+	return count;
+}
+
+static ssize_t
+show_in_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_hwmon_device *hwmon = &data->imgr->ec.hwmon;
+	int nr = to_sensor_dev_attr(attr)->index;
+
+	return sprintf(buf, "%s\n", hwmon->adc.label[nr]);
+}
+
+static ssize_t
+show_temp_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_hwmon_device *hwmon = &data->imgr->ec.hwmon;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%s\n", hwmon->fan.temp_label[nr]);
+}
+
+static ssize_t
+show_fan_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct imanager_hwmon_data *data = imanager_hwmon_update_device(dev);
+	struct imanager_hwmon_device *hwmon = &data->imgr->ec.hwmon;
+	int nr = to_sensor_dev_attr(attr)->index - 1;
+
+	return sprintf(buf, "%s\n", hwmon->fan.label[nr]);
+}
+
+/*
+ * Sysfs callback functions
+ */
+
+static SENSOR_DEVICE_ATTR(in0_label, 0444, show_in_label, NULL, 0);
+static SENSOR_DEVICE_ATTR(in0_input, 0444, show_in, NULL, 0);
+static SENSOR_DEVICE_ATTR(in0_min, 0644, show_in_min, store_in_min, 0);
+static SENSOR_DEVICE_ATTR(in0_max, 0644, show_in_max, store_in_max, 0);
+static SENSOR_DEVICE_ATTR(in0_alarm, 0444, show_in_alarm, NULL, 0);
+
+static SENSOR_DEVICE_ATTR(in1_label, 0444, show_in_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(in1_input, 0444, show_in, NULL, 1);
+static SENSOR_DEVICE_ATTR(in1_min, 0644, show_in_min, store_in_min, 1);
+static SENSOR_DEVICE_ATTR(in1_max, 0644, show_in_max, store_in_max, 1);
+static SENSOR_DEVICE_ATTR(in1_alarm, 0444, show_in_alarm, NULL, 1);
+
+static SENSOR_DEVICE_ATTR(in2_label, 0444, show_in_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(in2_input, 0444, show_in, NULL, 2);
+static SENSOR_DEVICE_ATTR(in2_min, 0644, show_in_min, store_in_min, 2);
+static SENSOR_DEVICE_ATTR(in2_max, 0644, show_in_max, store_in_max, 2);
+static SENSOR_DEVICE_ATTR(in2_alarm, 0444, show_in_alarm, NULL, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_label, 0444, show_temp_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 1);
+static SENSOR_DEVICE_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 1);
+static SENSOR_DEVICE_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 1);
+
+static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_temp_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_input, 0444, show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 2);
+static SENSOR_DEVICE_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 2);
+static SENSOR_DEVICE_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 2);
+
+static SENSOR_DEVICE_ATTR(temp3_label, 0444, show_temp_label, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp3_input, 0444, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp3_min, 0644, show_temp_min, store_temp_min, 3);
+static SENSOR_DEVICE_ATTR(temp3_max, 0644, show_temp_max, store_temp_max, 3);
+static SENSOR_DEVICE_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 3);
+
+static SENSOR_DEVICE_ATTR(fan1_label, 0444, show_fan_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan1_input, 0444, show_fan_in, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan1_min, 0644, show_fan_min, store_fan_min, 1);
+static SENSOR_DEVICE_ATTR(fan1_max, 0644, show_fan_max, store_fan_max, 1);
+static SENSOR_DEVICE_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 1);
+
+static SENSOR_DEVICE_ATTR(fan2_label, 0444, show_fan_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan2_input, 0444, show_fan_in, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan2_min, 0644, show_fan_min, store_fan_min, 2);
+static SENSOR_DEVICE_ATTR(fan2_max, 0644, show_fan_max, store_fan_max, 2);
+static SENSOR_DEVICE_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 2);
+
+static SENSOR_DEVICE_ATTR(fan3_label, 0444, show_fan_label, NULL, 3);
+static SENSOR_DEVICE_ATTR(fan3_input, 0444, show_fan_in, NULL, 3);
+static SENSOR_DEVICE_ATTR(fan3_min, 0644, show_fan_min, store_fan_min, 3);
+static SENSOR_DEVICE_ATTR(fan3_max, 0644, show_fan_max, store_fan_max, 3);
+static SENSOR_DEVICE_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 3);
+
+static SENSOR_DEVICE_ATTR(pwm1, 0644, show_pwm, store_pwm, 1);
+static SENSOR_DEVICE_ATTR(pwm1_min, 0644, show_pwm_min, store_pwm_min, 1);
+static SENSOR_DEVICE_ATTR(pwm1_max, 0644, show_pwm_max, store_pwm_max, 1);
+static SENSOR_DEVICE_ATTR(pwm1_enable, 0644, show_pwm_enable,
+			  store_pwm_enable, 1);
+static SENSOR_DEVICE_ATTR(pwm1_mode, 0644, show_pwm_mode, store_pwm_mode, 1);
+
+static SENSOR_DEVICE_ATTR(pwm2, 0644, show_pwm, store_pwm, 2);
+static SENSOR_DEVICE_ATTR(pwm2_min, 0644, show_pwm_min, store_pwm_min, 2);
+static SENSOR_DEVICE_ATTR(pwm2_max, 0644, show_pwm_max, store_pwm_max, 2);
+static SENSOR_DEVICE_ATTR(pwm2_enable, 0644, show_pwm_enable,
+			  store_pwm_enable, 2);
+static SENSOR_DEVICE_ATTR(pwm2_mode, 0644, show_pwm_mode, store_pwm_mode, 2);
+
+static SENSOR_DEVICE_ATTR(pwm3, 0644, show_pwm, store_pwm, 3);
+static SENSOR_DEVICE_ATTR(pwm3_min, 0644, show_pwm_min, store_pwm_min, 3);
+static SENSOR_DEVICE_ATTR(pwm3_max, 0644, show_pwm_max, store_pwm_max, 3);
+static SENSOR_DEVICE_ATTR(pwm3_enable, 0644, show_pwm_enable,
+			  store_pwm_enable, 3);
+static SENSOR_DEVICE_ATTR(pwm3_mode, 0644, show_pwm_mode, store_pwm_mode, 3);
+
+static SENSOR_DEVICE_ATTR(curr1_input, 0444, show_in, NULL, 4);
+static SENSOR_DEVICE_ATTR(curr1_min, 0644, show_in_min, store_in_min, 4);
+static SENSOR_DEVICE_ATTR(curr1_max, 0644, show_in_max, store_in_max, 4);
+static SENSOR_DEVICE_ATTR(curr1_alarm, 0444, show_in_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(curr1_average, 0444, show_in_average, NULL, 4);
+static SENSOR_DEVICE_ATTR(curr1_lowest, 0444, show_in_lowest, NULL, 4);
+static SENSOR_DEVICE_ATTR(curr1_highest, 0444, show_in_highest, NULL, 4);
+static SENSOR_DEVICE_ATTR(curr1_reset_history, 0200, NULL,
+			  store_in_reset_history, 4);
+
+static SENSOR_DEVICE_ATTR(cpu0_vid, 0444, show_in, NULL, 3);
+
+static struct attribute *imanager_in_attributes[] = {
+	&sensor_dev_attr_in0_label.dev_attr.attr,
+	&sensor_dev_attr_in0_input.dev_attr.attr,
+	&sensor_dev_attr_in0_min.dev_attr.attr,
+	&sensor_dev_attr_in0_max.dev_attr.attr,
+	&sensor_dev_attr_in0_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_in1_label.dev_attr.attr,
+	&sensor_dev_attr_in1_input.dev_attr.attr,
+	&sensor_dev_attr_in1_min.dev_attr.attr,
+	&sensor_dev_attr_in1_max.dev_attr.attr,
+	&sensor_dev_attr_in1_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_in2_label.dev_attr.attr,
+	&sensor_dev_attr_in2_input.dev_attr.attr,
+	&sensor_dev_attr_in2_min.dev_attr.attr,
+	&sensor_dev_attr_in2_max.dev_attr.attr,
+	&sensor_dev_attr_in2_alarm.dev_attr.attr,
+
+	NULL
+};
+
+#define to_dev(obj) container_of(obj, struct device, kobj)
+
+static umode_t
+imanager_in_is_visible(struct kobject *kobj, struct attribute *attr, int index)
+{
+	struct device *dev = to_dev(kobj);
+	struct imanager_hwmon_data *data = dev_get_drvdata(dev);
+	struct imanager_hwmon_device *hwmon = &data->imgr->ec.hwmon;
+
+	if (hwmon->adc.num <= EC_MAX_ADC_NUM)
+		return attr->mode;
+
+	return 0;
+}
+
+static const struct attribute_group imanager_group_in = {
+	.attrs = imanager_in_attributes,
+	.is_visible = imanager_in_is_visible,
+};
+
+static struct attribute *imanager_other_attributes[] = {
+	&sensor_dev_attr_curr1_input.dev_attr.attr,
+	&sensor_dev_attr_curr1_min.dev_attr.attr,
+	&sensor_dev_attr_curr1_max.dev_attr.attr,
+	&sensor_dev_attr_curr1_alarm.dev_attr.attr,
+	&sensor_dev_attr_curr1_average.dev_attr.attr,
+	&sensor_dev_attr_curr1_lowest.dev_attr.attr,
+	&sensor_dev_attr_curr1_highest.dev_attr.attr,
+	&sensor_dev_attr_curr1_reset_history.dev_attr.attr,
+
+	&sensor_dev_attr_cpu0_vid.dev_attr.attr,
+
+	NULL
+};
+
+static umode_t imanager_other_is_visible(struct kobject *kobj,
+					 struct attribute *attr, int index)
+{
+	struct device *dev = to_dev(kobj);
+	struct imanager_hwmon_data *data = dev_get_drvdata(dev);
+	struct imanager_hwmon_device *hwmon = &data->imgr->ec.hwmon;
+
+	/*
+	 * There are either 3 or 5 VINs available
+	 * vin3 is current monitoring
+	 * vin4 is CPU VID
+	 */
+	if (hwmon->adc.num == EC_MAX_ADC_NUM)
+		return attr->mode;
+
+	return 0;
+}
+
+static const struct attribute_group imanager_group_other = {
+	.attrs = imanager_other_attributes,
+	.is_visible = imanager_other_is_visible,
+};
+
+static struct attribute *imanager_fan_attributes[] = {
+	&sensor_dev_attr_fan1_label.dev_attr.attr,
+	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&sensor_dev_attr_fan1_min.dev_attr.attr,
+	&sensor_dev_attr_fan1_max.dev_attr.attr,
+	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_fan2_label.dev_attr.attr,
+	&sensor_dev_attr_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan2_min.dev_attr.attr,
+	&sensor_dev_attr_fan2_max.dev_attr.attr,
+	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_fan3_label.dev_attr.attr,
+	&sensor_dev_attr_fan3_input.dev_attr.attr,
+	&sensor_dev_attr_fan3_min.dev_attr.attr,
+	&sensor_dev_attr_fan3_max.dev_attr.attr,
+	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_temp1_label.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_min.dev_attr.attr,
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_temp2_label.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_min.dev_attr.attr,
+	&sensor_dev_attr_temp2_max.dev_attr.attr,
+	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_temp3_label.dev_attr.attr,
+	&sensor_dev_attr_temp3_input.dev_attr.attr,
+	&sensor_dev_attr_temp3_min.dev_attr.attr,
+	&sensor_dev_attr_temp3_max.dev_attr.attr,
+	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_pwm1.dev_attr.attr,
+	&sensor_dev_attr_pwm1_min.dev_attr.attr,
+	&sensor_dev_attr_pwm1_max.dev_attr.attr,
+	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
+	&sensor_dev_attr_pwm1_mode.dev_attr.attr,
+
+	&sensor_dev_attr_pwm2.dev_attr.attr,
+	&sensor_dev_attr_pwm2_min.dev_attr.attr,
+	&sensor_dev_attr_pwm2_max.dev_attr.attr,
+	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
+	&sensor_dev_attr_pwm2_mode.dev_attr.attr,
+
+	&sensor_dev_attr_pwm3.dev_attr.attr,
+	&sensor_dev_attr_pwm3_min.dev_attr.attr,
+	&sensor_dev_attr_pwm3_max.dev_attr.attr,
+	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
+	&sensor_dev_attr_pwm3_mode.dev_attr.attr,
+
+	NULL
+};
+
+static umode_t
+imanager_fan_is_visible(struct kobject *kobj, struct attribute *attr, int index)
+{
+	struct device *dev = to_dev(kobj);
+	struct imanager_hwmon_data *data = dev_get_drvdata(dev);
+	struct imanager_fan_device *fan = &data->imgr->ec.hwmon.fan;
+
+	if ((index >= 0) && (index <= 14)) { /* fan */
+		if (!fan->attr[index / 5])
+			return 0;
+	} else if ((index >= 15) && (index <= 29)) { /* temp */
+		if (!fan->attr[(index - 15) / 5])
+			return 0;
+	} else if ((index >= 30) && (index <= 34)) { /* pwm */
+		if (!fan->attr[(index - 30) / 5])
+			return 0;
+	}
+
+	return attr->mode;
+}
+
+static const struct attribute_group imanager_group_fan = {
+	.attrs = imanager_fan_attributes,
+	.is_visible = imanager_fan_is_visible,
+};
+
+static int imanager_hwmon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct imanager_device_data *imgr = dev_get_drvdata(dev->parent);
+	struct imanager_ec_data *ec = &imgr->ec;
+	struct imanager_hwmon_device *hwmon = &ec->hwmon;
+	struct imanager_hwmon_data *data;
+	struct device *hwmon_dev;
+	int i, num_attr_groups = 0;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->imgr = imgr;
+	platform_set_drvdata(pdev, data);
+
+	/* read fan control settings */
+	for (i = 0; i < hwmon->fan.num; i++)
+		imanager_hwmon_read_fan_ctrl(ec, i, &data->fan[i]);
+
+	data->groups[num_attr_groups++] = &imanager_group_in;
+
+	if (hwmon->adc.num > 3)
+		data->groups[num_attr_groups++] = &imanager_group_other;
+
+	if (hwmon->fan.num)
+		data->groups[num_attr_groups++] = &imanager_group_fan;
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+							   "imanager_hwmon",
+							   data, data->groups);
+
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static struct platform_driver imanager_hwmon_driver = {
+	.driver = {
+		.name  = "imanager-hwmon",
+	},
+	.probe	= imanager_hwmon_probe,
+};
+
+module_platform_driver(imanager_hwmon_driver);
+
+MODULE_DESCRIPTION("Advantech iManager HWmon Driver");
+MODULE_AUTHOR("Richard Vidal-Dorsch <richard.dorsch at advantech.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imanager-hwmon");
-- 
2.10.1