Message-ID: <9902da61-a612-4d8f-b367-0eb74b12e6d9@roeck-us.net>
Date:   Thu, 7 Oct 2021 09:45:31 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Denis Pauk <pauk.denis@...il.com>
Cc:     andy.shevchenko@...il.com, Ed Brindley <kernel@...davale.org>,
        Jean Delvare <jdelvare@...e.com>,
        Eugene Shalygin <eugene.shalygin@...il.com>,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v2 3/3] hwmon: (asus_wmi_sensors) Support X370 Asus WMI.

On 10/6/21 3:25 PM, Denis Pauk wrote:
> Provides a Linux kernel module "asus_wmi_sensors" that provides sensor
> readouts via ASUS' WMI interface present in the UEFI of
> X370/X470/B450/X399 Ryzen motherboards.
> 
> Supported motherboards:
> * ROG CROSSHAIR VI HERO,
> * PRIME X399-A,
> * PRIME X470-PRO,
> * ROG CROSSHAIR VI EXTREME,
> * ROG CROSSHAIR VI HERO (WI-FI AC),
> * ROG CROSSHAIR VII HERO,
> * ROG CROSSHAIR VII HERO (WI-FI),
> * ROG STRIX B450-E GAMING,
> * ROG STRIX B450-F GAMING,
> * ROG STRIX B450-I GAMING,
> * ROG STRIX X399-E GAMING,
> * ROG STRIX X470-F GAMING,
> * ROG STRIX X470-I GAMING,
> * ROG ZENITH EXTREME,
> * ROG ZENITH EXTREME ALPHA.
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
> Signed-off-by: Denis Pauk <pauk.denis@...il.com>
> Co-developed-by: Ed Brindley <kernel@...davale.org>
> Signed-off-by: Ed Brindley <kernel@...davale.org>
> 
> ---
> Changes in v2:
> - Add module for boards with support of WMI interface returned sensor name and
>     value of sensor..
> ---
>   MAINTAINERS                      |   1 +
>   drivers/hwmon/Kconfig            |  11 +
>   drivers/hwmon/Makefile           |   1 +
>   drivers/hwmon/asus_wmi_sensors.c | 661 +++++++++++++++++++++++++++++++

New drivers also need to be documented in Documentation/hwmon/.

How does this differ from the hwmon device instantiated from
drivers/platform/x86/asus-wmi.c ?

Guenter

>   4 files changed, 674 insertions(+)
>   create mode 100644 drivers/hwmon/asus_wmi_sensors.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index bc2e981a54e2..3f77d1d17841 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2942,6 +2942,7 @@ M:	Eugene Shalygin <eugene.shalygin@...il.com>
>   M:	Denis Pauk <pauk.denis@...il.com>
>   L:	linux-hwmon@...r.kernel.org
>   S:	Maintained
> +F:	drivers/hwmon/asus_wmi_sensors.c
>   F:	drivers/hwmon/asus_wmi_ec_sensors.c
>   
>   ASUS WIRELESS RADIO CONTROL DRIVER
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index b7107721a401..ddb1d251d81a 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -2215,6 +2215,17 @@ config SENSORS_ATK0110
>   	  This driver can also be built as a module. If so, the module
>   	  will be called asus_atk0110.
>   
> +config SENSORS_ASUS_WMI
> +	tristate "ASUS WMI X370/X470/B450/X399"
> +	help
> +	  If you say yes here you get support for the ACPI hardware monitoring
> +	  interface found in X370/X470/B450/X399 ASUS motherboards. This driver
> +	  will provide readings of fans, voltages and temperatures through the system
> +	  firmware.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called asus_wmi_sensors.
> +
>   config SENSORS_ASUS_WMI_EC
>   	tristate "ASUS WMI B550/X570"
>   	help
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index aae2ff5c7335..656a6191a0f8 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_HWMON_VID)		+= hwmon-vid.o
>   # APCI drivers
>   obj-$(CONFIG_SENSORS_ACPI_POWER) += acpi_power_meter.o
>   obj-$(CONFIG_SENSORS_ATK0110)	+= asus_atk0110.o
> +obj-$(CONFIG_SENSORS_ASUS_WMI)	+= asus_wmi_sensors.o
>   obj-$(CONFIG_SENSORS_ASUS_WMI_EC)	+= asus_wmi_ec_sensors.o
>   
>   # Native drivers
> diff --git a/drivers/hwmon/asus_wmi_sensors.c b/drivers/hwmon/asus_wmi_sensors.c
> new file mode 100644
> index 000000000000..792872b068d7
> --- /dev/null
> +++ b/drivers/hwmon/asus_wmi_sensors.c
> @@ -0,0 +1,661 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * HWMON driver for ASUS motherboards that provides sensor readouts via WMI
> + * interface present in the UEFI of the X370/X470/B450/X399 Ryzen motherboards.
> + *
> + * Copyright (C) 2021 Eugene Shalygin <eugene.shalygin@...il.com>
> + * Copyright (C) 2018-2019 Ed Brindley <kernel@...davale.org>
> + *
> + * WMI interface provided:
> + * CPU Core Voltage,
> + * CPU SOC Voltage,
> + * DRAM Voltage,
> + * VDDP Voltage,
> + * 1.8V PLL Voltage,
> + * +12V Voltage,
> + * +5V Voltage,
> + * 3VSB Voltage,
> + * VBAT Voltage,
> + * AVCC3 Voltage,
> + * SB 1.05V Voltage,
> + * CPU Core Voltage,
> + * CPU SOC Voltage,
> + * DRAM Voltage,
> + * CPU Fan,
> + * Chassis Fan 1,
> + * Chassis Fan 2,
> + * Chassis Fan 3,
> + * HAMP Fan,
> + * Water Pump,
> + * CPU OPT,
> + * Water Flow,
> + * AIO Pump,
> + * CPU Temperature,
> + * CPU Socket Temperature,
> + * Motherboard Temperature,
> + * Chipset Temperature,
> + * Tsensor 1 Temperature,
> + * CPU VRM Temperature,
> + * Water In,
> + * Water Out,
> + * CPU VRM Output Current.
> + */
> +#include <linux/acpi.h>
> +#include <linux/dmi.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/init.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/units.h>
> +#include <linux/wmi.h>
> +
> +#define ASUSWMI_MONITORING_GUID		"466747A0-70EC-11DE-8A39-0800200C9A66"
> +#define ASUSWMI_METHODID_GET_VALUE	0x52574543
> +#define ASUSWMI_METHODID_UPDATE_BUFFER	0x51574543
> +#define ASUSWMI_METHODID_GET_INFO	0x50574543
> +#define ASUSWMI_METHODID_GET_NUMBER		0x50574572
> +#define ASUSWMI_METHODID_GET_VERSION		0x50574574
> +
> +#define ASUS_WMI_MAX_STR_SIZE	32
> +
> +/* boards with wmi sensors support */
> +static const char *const asus_wmi_boards_names[] = {
> +	"ROG CROSSHAIR VI HERO",
> +	"PRIME X399-A",
> +	"PRIME X470-PRO",
> +	"ROG CROSSHAIR VI EXTREME",
> +	"ROG CROSSHAIR VI HERO (WI-FI AC)",
> +	"ROG CROSSHAIR VII HERO",
> +	"ROG CROSSHAIR VII HERO (WI-FI)",
> +	"ROG STRIX B450-E GAMING",
> +	"ROG STRIX B450-F GAMING",
> +	"ROG STRIX B450-I GAMING",
> +	"ROG STRIX X399-E GAMING",
> +	"ROG STRIX X470-F GAMING",
> +	"ROG STRIX X470-I GAMING",
> +	"ROG ZENITH EXTREME",
> +	"ROG ZENITH EXTREME ALPHA",
> +};
> +
> +enum asus_wmi_sensor_class {
> +	VOLTAGE = 0x0,
> +	TEMPERATURE_C = 0x1,
> +	FAN_RPM = 0x2,
> +	CURRENT = 0x3,
> +	WATER_FLOW = 0x4,
> +};
> +
> +enum asus_wmi_location {
> +	CPU = 0x0,
> +	CPU_SOC = 0x1,
> +	DRAM = 0x2,
> +	MOTHERBOARD = 0x3,
> +	CHIPSET = 0x4,
> +	AUX = 0x5,
> +	VRM = 0x6,
> +	COOLER = 0x7
> +};
> +
> +enum asus_wmi_type {
> +	SIGNED_INT = 0x0,
> +	UNSIGNED_INT = 0x1,
> +	SCALED = 0x3,
> +};
> +
> +enum asus_wmi_source {
> +	SIO = 0x1,
> +	EC = 0x2
> +};
> +
> +static enum hwmon_sensor_types asus_data_types[] = {
> +	[VOLTAGE] = hwmon_in,
> +	[TEMPERATURE_C] = hwmon_temp,
> +	[FAN_RPM] = hwmon_fan,
> +	[CURRENT] = hwmon_curr,
> +	[WATER_FLOW] = hwmon_fan,
> +};
> +
> +static u32 hwmon_attributes[] = {
> +	[hwmon_chip] = HWMON_C_REGISTER_TZ,
> +	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
> +	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
> +	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
> +	[hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
> +};
> +
> +/**
> + * struct asus_wmi_sensor_info - sensor info.
> + * @id: sensor id.
> + * @data_type: sensor class e.g. voltage, temp etc.
> + * @location: sensor location.
> + * @name: sensor name.
> + * @source: sensor source.
> + * @type: sensor type signed, unsigned etc.
> + * @cached_value: cached sensor value.
> + */
> +struct asus_wmi_sensor_info {
> +	u32 id;
> +	int data_type;
> +	int location;
> +	char name[ASUS_WMI_MAX_STR_SIZE];
> +	int source;
> +	int type;
> +	u32 cached_value;
> +};
> +
> +struct asus_wmi_wmi_info {
> +	u8 buffer;
> +	unsigned long source_last_updated[3];	/* in jiffies */
> +	u8 sensor_count;
> +
> +	const struct asus_wmi_sensor_info **info[hwmon_max];
> +	struct asus_wmi_sensor_info **info_by_id;
> +};
> +
> +struct asus_wmi_sensors {
> +	/* lock access to instrnal cache */
> +	struct mutex lock;
> +	struct asus_wmi_wmi_info wmi;
> +
> +	int wmi_board;
> +};
> +
> +struct asus_wmi_data {
> +	int wmi_board;
> +	int wmi_count;
> +};
> +
> +/*
> + * Universal method for calling WMI method
> + */
> +static int asus_wmi_call_method(u32 method_id, u32 *args, struct acpi_buffer *output)
> +{
> +	struct acpi_buffer input = {(acpi_size) sizeof(*args), args };
> +	acpi_status status;
> +
> +	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0, method_id, &input, output);
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	return 0;
> +}
> +
> +/*
> + * Gets the version of the ASUS sensors interface implemented
> + */
> +static int asus_wmi_get_version(u32 *version)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {0, 0, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_VERSION, args, &output);
> +	if (err)
> +		return err;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
> +		return -EIO;
> +
> +	*version = obj->integer.value;
> +
> +	return 0;
> +}
> +
> +/*
> + * Gets the number of sensor items
> + */
> +static int asus_wmi_get_item_count(u32 *count)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {0, 0, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_NUMBER, args, &output);
> +	if (err)
> +		return err;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
> +		return -EIO;
> +
> +	*count = obj->integer.value;
> +
> +	return 0;
> +}
> +
> +static int asus_wmi_hwmon_add_chan_info(struct hwmon_channel_info *asus_wmi_hwmon_chan,
> +					struct device *dev, int num,
> +					enum hwmon_sensor_types type, u32 config)
> +{
> +	u32 *cfg;
> +
> +	cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
> +	if (!cfg)
> +		return -ENOMEM;
> +
> +	asus_wmi_hwmon_chan->type = type;
> +	asus_wmi_hwmon_chan->config = cfg;
> +	memset32(cfg, config, num);
> +
> +	return 0;
> +}
> +
> +/*
> + * For a given sensor item returns details e.g. type (voltage/temperature/fan speed etc), bank etc
> + */
> +static int asus_wmi_sensor_info(int index, struct asus_wmi_sensor_info *s)
> +{
> +	union acpi_object name_obj, data_type_obj, location_obj, source_obj, type_obj;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {index, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_INFO, args, &output);
> +	if (err)
> +		return err;
> +
> +	s->id = index;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_PACKAGE)
> +		return -EIO;
> +
> +	if (obj->package.count != 5)
> +		return 1;
> +
> +	name_obj = obj->package.elements[0];
> +
> +	if (name_obj.type != ACPI_TYPE_STRING)
> +		return 1;
> +
> +	strncpy(s->name, name_obj.string.pointer, sizeof(s->name) - 1);
> +
> +	data_type_obj = obj->package.elements[1];
> +
> +	if (data_type_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->data_type = data_type_obj.integer.value;
> +
> +	location_obj = obj->package.elements[2];
> +
> +	if (location_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->location = location_obj.integer.value;
> +
> +	source_obj = obj->package.elements[3];
> +
> +	if (source_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->source = source_obj.integer.value;
> +
> +	type_obj = obj->package.elements[4];
> +
> +	if (type_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->type = type_obj.integer.value;
> +
> +	return 0;
> +}
> +
> +static int asus_wmi_update_buffer(u8 source)
> +{
> +	u32 args[] = {source, 0};
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +
> +	return asus_wmi_call_method(ASUSWMI_METHODID_UPDATE_BUFFER, args, &output);
> +}
> +
> +static int asus_wmi_get_sensor_value(u8 index, u32 *value)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {index, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_VALUE, args, &output);
> +	if (err)
> +		return err;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
> +		return -EIO;
> +
> +	*value = obj->integer.value;
> +
> +	return 0;
> +}
> +
> +static void asus_wmi_update_values_for_source(u8 source, struct asus_wmi_sensors *sensor_data)
> +{
> +	int ret = 0;
> +	int value = 0;
> +	int i;
> +	struct asus_wmi_sensor_info *sensor;
> +
> +	for (i = 0; i < sensor_data->wmi.sensor_count; i++) {
> +		sensor = sensor_data->wmi.info_by_id[i];
> +		if (sensor && sensor->source == source) {
> +			ret = asus_wmi_get_sensor_value(sensor->id, &value);
> +			if (!ret)
> +				sensor->cached_value = value;
> +		}
> +	}
> +}
> +
> +static int asus_wmi_scale_sensor_value(u32 value, int data_type)
> +{
> +	/* FAN_RPM and WATER_FLOW don't need scaling */
> +	switch (data_type) {
> +	case VOLTAGE:
> +		return DIV_ROUND_CLOSEST(value, 1000);
> +	case TEMPERATURE_C:
> +		return value * 1000;
> +	case CURRENT:
> +		return value * 1000;
> +	}
> +	return value;
> +}
> +
> +static int asus_wmi_get_cached_value_or_update(const struct asus_wmi_sensor_info *sensor,
> +					       struct asus_wmi_sensors *sensor_data,
> +					       u32 *value)
> +{
> +	int ret;
> +
> +	if (time_after(jiffies, sensor_data->wmi.source_last_updated[sensor->source] + HZ)) {
> +		ret = asus_wmi_update_buffer(sensor->source);
> +		if (ret)
> +			return -EIO;
> +
> +		sensor_data->wmi.buffer = sensor->source;
> +
> +		asus_wmi_update_values_for_source(sensor->source, sensor_data);
> +		sensor_data->wmi.source_last_updated[sensor->source] = jiffies;
> +	}
> +
> +	*value = sensor->cached_value;
> +	return 0;
> +}
> +
> +/*
> + * Now follow the functions that implement the hwmon interface
> + */
> +
> +static int asus_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
> +			       u32 attr, int channel, long *val)
> +{
> +	int ret;
> +	u32 value = 0;
> +	const struct asus_wmi_sensor_info *sensor;
> +
> +	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
> +
> +	sensor = *(sensor_data->wmi.info[type] + channel);
> +
> +	mutex_lock(&sensor_data->lock);
> +
> +	ret = asus_wmi_get_cached_value_or_update(sensor, sensor_data, &value);
> +	mutex_unlock(&sensor_data->lock);
> +
> +	if (!ret)
> +		*val = asus_wmi_scale_sensor_value(value, sensor->data_type);
> +
> +	return ret;
> +}
> +
> +static int asus_wmi_hwmon_read_string(struct device *dev,
> +				      enum hwmon_sensor_types type, u32 attr,
> +				      int channel, const char **str)
> +{
> +	const struct asus_wmi_sensor_info *sensor;
> +	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
> +
> +	sensor = *(sensor_data->wmi.info[type] + channel);
> +	*str = sensor->name;
> +
> +	return 0;
> +}
> +
> +static umode_t asus_wmi_hwmon_is_visible(const void *drvdata,
> +					 enum hwmon_sensor_types type, u32 attr,
> +					 int channel)
> +{
> +	const struct asus_wmi_sensor_info *sensor;
> +	const struct asus_wmi_sensors *sensor_data = drvdata;
> +
> +	sensor = *(sensor_data->wmi.info[type] + channel);
> +	if (sensor && sensor->name)
> +		return 0444;
> +
> +	return 0;
> +}
> +
> +static const struct hwmon_ops asus_wmi_hwmon_ops = {
> +	.is_visible = asus_wmi_hwmon_is_visible,
> +	.read = asus_wmi_hwmon_read,
> +	.read_string = asus_wmi_hwmon_read_string,
> +};
> +
> +static struct hwmon_chip_info asus_wmi_chip_info = {
> +	.ops = &asus_wmi_hwmon_ops,
> +	.info = NULL,
> +};
> +
> +static int asus_wmi_configure_sensor_setup(struct platform_device *pdev,
> +					   struct asus_wmi_sensors *sensor_data)
> +{
> +	int err;
> +	int i, idx;
> +	int nr_count[hwmon_max] = {0}, nr_types = 0;
> +	struct device *hwdev;
> +	struct device *dev = &pdev->dev;
> +	struct hwmon_channel_info *asus_wmi_hwmon_chan;
> +	struct asus_wmi_sensor_info *temp_sensor;
> +	enum hwmon_sensor_types type;
> +	const struct hwmon_channel_info **ptr_asus_wmi_ci;
> +	const struct hwmon_chip_info *chip_info;
> +
> +	sensor_data->wmi.buffer = -1;
> +	temp_sensor = devm_kcalloc(dev, 1, sizeof(*temp_sensor), GFP_KERNEL);
> +	if (!temp_sensor)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < sensor_data->wmi.sensor_count; i++) {
> +		err = asus_wmi_sensor_info(i, temp_sensor);
> +		if (err)
> +			return -EINVAL;
> +
> +		switch (temp_sensor->data_type) {
> +		case TEMPERATURE_C:
> +		case VOLTAGE:
> +		case CURRENT:
> +		case FAN_RPM:
> +		case WATER_FLOW:
> +			type = asus_data_types[temp_sensor->data_type];
> +			if (!nr_count[type])
> +				nr_types++;
> +			nr_count[type]++;
> +			break;
> +		}
> +	}
> +
> +	if (nr_count[hwmon_temp])
> +		nr_count[hwmon_chip]++, nr_types++;
> +
> +	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types,
> +					   sizeof(*asus_wmi_hwmon_chan),
> +					   GFP_KERNEL);
> +	if (!asus_wmi_hwmon_chan)
> +		return -ENOMEM;
> +
> +	ptr_asus_wmi_ci = devm_kcalloc(dev, nr_types + 1,
> +				       sizeof(*ptr_asus_wmi_ci), GFP_KERNEL);
> +	if (!ptr_asus_wmi_ci)
> +		return -ENOMEM;
> +
> +	asus_wmi_chip_info.info = ptr_asus_wmi_ci;
> +	chip_info = &asus_wmi_chip_info;
> +
> +	sensor_data->wmi.info_by_id = devm_kcalloc(dev, sensor_data->wmi.sensor_count,
> +						   sizeof(*sensor_data->wmi.info_by_id),
> +						   GFP_KERNEL);
> +
> +	if (!sensor_data->wmi.info_by_id)
> +		return -ENOMEM;
> +
> +	for (type = 0; type < hwmon_max; type++) {
> +		if (!nr_count[type])
> +			continue;
> +
> +		asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
> +					     nr_count[type], type,
> +					     hwmon_attributes[type]);
> +		*ptr_asus_wmi_ci++ = asus_wmi_hwmon_chan++;
> +
> +		sensor_data->wmi.info[type] = devm_kcalloc(dev,
> +							   nr_count[type],
> +							   sizeof(*sensor_data->wmi.info),
> +							   GFP_KERNEL);
> +		if (!sensor_data->wmi.info[type])
> +			return -ENOMEM;
> +	}
> +
> +	for (i = sensor_data->wmi.sensor_count - 1; i >= 0 ; i--) {
> +		temp_sensor = devm_kzalloc(dev, sizeof(*temp_sensor), GFP_KERNEL);
> +		if (!temp_sensor)
> +			return -ENOMEM;
> +
> +		err = asus_wmi_sensor_info(i, temp_sensor);
> +		if (err)
> +			continue;
> +
> +		switch (temp_sensor->data_type) {
> +		case TEMPERATURE_C:
> +		case VOLTAGE:
> +		case CURRENT:
> +		case FAN_RPM:
> +		case WATER_FLOW:
> +			type = asus_data_types[temp_sensor->data_type];
> +			idx = --nr_count[type];
> +			*(sensor_data->wmi.info[type] + idx) = temp_sensor;
> +			sensor_data->wmi.info_by_id[i] = temp_sensor;
> +			break;
> +		}
> +	}
> +
> +	dev_dbg(&pdev->dev, "%s board has %d sensors",
> +		asus_wmi_boards_names[sensor_data->wmi_board],
> +		sensor_data->wmi.sensor_count);
> +
> +	hwdev = devm_hwmon_device_register_with_info(dev, KBUILD_MODNAME,
> +						     sensor_data, chip_info, NULL);
> +
> +	return PTR_ERR_OR_ZERO(hwdev);
> +}
> +
> +static int asus_wmi_probe(struct platform_device *pdev)
> +{
> +	struct asus_wmi_sensors *sensor_data;
> +	struct device *dev = &pdev->dev;
> +	struct asus_wmi_data *data;
> +
> +	data = dev_get_platdata(dev);
> +
> +	sensor_data = devm_kzalloc(dev, sizeof(struct asus_wmi_sensors),
> +				   GFP_KERNEL);
> +	if (!sensor_data)
> +		return -ENOMEM;
> +
> +	mutex_init(&sensor_data->lock);
> +	sensor_data->wmi_board = data->wmi_board;
> +	sensor_data->wmi.sensor_count = data->wmi_count;
> +
> +	platform_set_drvdata(pdev, sensor_data);
> +
> +	return asus_wmi_configure_sensor_setup(pdev,
> +					       sensor_data);
> +	return 0;
> +}
> +
> +static struct platform_driver asus_wmi_sensors_platform_driver = {
> +	.driver = {
> +		.name	= "asus-wmi-sensors",
> +	},
> +	.probe = asus_wmi_probe,
> +};
> +
> +static struct platform_device *sensors_pdev;
> +
> +static int __init asus_wmi_init(void)
> +{
> +	const char *board_vendor, *board_name;
> +	u32 version = 0;
> +	struct asus_wmi_data data;
> +
> +	data.wmi_board = -1;
> +	data.wmi_count = 0;
> +
> +	board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
> +	board_name = dmi_get_system_info(DMI_BOARD_NAME);
> +
> +	if (board_vendor && board_name &&
> +	    !strcmp(board_vendor, "ASUSTeK COMPUTER INC.")) {
> +		if (!wmi_has_guid(ASUSWMI_MONITORING_GUID))
> +			return -ENODEV;
> +
> +		data.wmi_board = match_string(asus_wmi_boards_names,
> +					      ARRAY_SIZE(asus_wmi_boards_names),
> +					      board_name);
> +
> +		if (data.wmi_board >= 0) {
> +			if (asus_wmi_get_item_count(&data.wmi_count))
> +				return -ENODEV;
> +
> +			if (asus_wmi_get_version(&version))
> +				return -ENODEV;
> +
> +			if (data.wmi_count  <= 0 || version < 2) {
> +				pr_err("Board: %s WMI wmi version: %u with %d sensors is unsupported\n",
> +				       board_name, version, data.wmi_count);
> +
> +				data.wmi_board = -ENODEV;
> +			}
> +		}
> +	}
> +
> +	/* Nothing to support */
> +	if (data.wmi_board < 0)
> +		return -ENODEV;
> +
> +	sensors_pdev = platform_create_bundle(&asus_wmi_sensors_platform_driver,
> +					      asus_wmi_probe,
> +					      NULL, 0,
> +					      &data, sizeof(struct asus_wmi_data));
> +
> +	return PTR_ERR_OR_ZERO(sensors_pdev);
> +}
> +module_init(asus_wmi_init);
> +
> +static void __exit asus_wmi_exit(void)
> +{
> +	platform_device_unregister(sensors_pdev);
> +	platform_driver_unregister(&asus_wmi_sensors_platform_driver);
> +}
> +module_exit(asus_wmi_exit);
> +
> +MODULE_AUTHOR("Ed Brindley <kernel@...davale.org>");
> +MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@...il.com>");
> +MODULE_DESCRIPTION("Asus WMI Sensors Driver");
> +MODULE_LICENSE("GPL");
> 

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