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Date:   Sun,  3 Oct 2021 00:08:56 +0300
From:   Denis Pauk <pauk.denis@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     pauk.denis@...il.com, Eugene Shalygin <eugene.shalygin@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org
Subject: [PATCH 3/3] hwmon: (asus_wmi_sensors) Support access via Asus WMI.

Linux HWMON sensors driver for ASUS motherboards to read
sensors from the embedded controller.

Many ASUS motherboards do not publish all the available
sensors via the Super I/O chip but the missing ones are
available through the embedded controller (EC) registers.

This driver implements reading those sensor data via the
WMI method BREC, which is known to be present in all ASUS
motherboards based on the AMD 500 series chipsets (and
probably is available in other models too). The driver
needs to know exact register addresses for the sensors and
thus support for each motherboard has to be added explicitly.

Supported motherboards:
* ROG CROSSHAIR VIII HERO
* ROG CROSSHAIR VIII DARK HERO
* ROG CROSSHAIR VIII FORMULA
* ROG STRIX X570-E GAMING
* ROG STRIX B550-E GAMING

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
Signed-off-by: Denis Pauk <pauk.denis@...il.com>
Co-developed-by: Eugene Shalygin <eugene.shalygin@...il.com>
Signed-off-by: Eugene Shalygin <eugene.shalygin@...il.com>
Cc: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Guenter Roeck <linux@...ck-us.net>
---
 drivers/hwmon/Kconfig            |  12 +
 drivers/hwmon/Makefile           |   1 +
 drivers/hwmon/asus_wmi_sensors.c | 595 +++++++++++++++++++++++++++++++
 3 files changed, 608 insertions(+)
 create mode 100644 drivers/hwmon/asus_wmi_sensors.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 7fde4c6e1e7f..cb8c8ebb0dab 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2215,6 +2215,18 @@ 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"
+	depends on X86
+	help
+	  If you say yes here you get support for the ACPI hardware
+	  monitoring interface found in many 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.
+
 endif # ACPI
 
 endif # HWMON
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index baee6a8d4dd1..dbadc79b890d 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
 
 # Native drivers
 # asb100, then w83781d go first, as they can override other drivers' addresses.
diff --git a/drivers/hwmon/asus_wmi_sensors.c b/drivers/hwmon/asus_wmi_sensors.c
new file mode 100644
index 000000000000..6b04fad18891
--- /dev/null
+++ b/drivers/hwmon/asus_wmi_sensors.c
@@ -0,0 +1,595 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HWMON driver for ASUS motherboards that publish some sensor values
+ * via the embedded controller registers
+ *
+ * Copyright (C) 2021 Eugene Shalygin <eugene.shalygin@...il.com>
+ * Copyright (C) 2018-2019 Ed Brindley <kernel@...davale.org>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#define DRVNAME "asus_wmi_sensors"
+
+#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/acpi.h>
+#include <linux/wmi.h>
+
+#define ASUSWMI_MONITORING_GUID		"466747A0-70EC-11DE-8A39-0800200C9A66"
+#define ASUSWMI_METHODID_BLOCK_READ_EC		0x42524543 /* BREC */
+
+#define HWMON_MAX	9
+
+#define ASUS_WMI_BLOCK_READ_REGISTERS_MAX 0x10 /* from the ASUS DSDT source */
+/* from the ASUS_WMI_BLOCK_READ_REGISTERS_MAX value */
+#define ASUS_WMI_MAX_BUF_LEN 0x80
+#define MAX_SENSOR_LABEL_LENGTH 0x10
+
+#define ASUSWMI_SENSORS_MAX 11
+#define ASUS_EC_KNOWN_EC_REGISTERS 14
+
+enum asus_wmi_ec_board {
+	BOARD_R_C8H, // ROG Crosshair VIII Hero
+	BOARD_R_C8DH, // ROG Crosshair VIII Dark Hero
+	BOARD_R_C8F, // ROG Crosshair VIII Formula
+	BOARD_RS_X570_E_G, // ROG STRIX X570-E GAMING
+	BOARD_RS_B550_E_G, // ROG STRIX B550-E GAMING
+};
+
+/* boards with EC support */
+static const char *const asus_wmi_ec_boards_names[] = {
+	[BOARD_R_C8H] = "ROG CROSSHAIR VIII HERO",
+	[BOARD_R_C8DH] = "ROG CROSSHAIR VIII DARK HERO",
+	[BOARD_R_C8F] = "ROG CROSSHAIR VIII FORMULA",
+	[BOARD_RS_X570_E_G] = "ROG STRIX X570-E GAMING",
+	[BOARD_RS_B550_E_G] = "ROG STRIX B550-E GAMING",
+};
+
+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,
+};
+
+union asus_wmi_ec_sensor_address {
+	u32 value;
+	struct {
+		u8 index;
+		u8 bank;
+		u8 size;
+		u8 dummy;
+	} addr;
+};
+
+struct asus_wmi_ec_sensor_info {
+	char label[MAX_SENSOR_LABEL_LENGTH];
+	enum hwmon_sensor_types type;
+	union asus_wmi_ec_sensor_address addr;
+	u32 cached_value;
+};
+
+struct asus_wmi_ec_info {
+	struct asus_wmi_ec_sensor_info sensors[ASUSWMI_SENSORS_MAX];
+	/* UTF-16 string to pass to BRxx() WMI function */
+	char read_arg[((ASUS_WMI_BLOCK_READ_REGISTERS_MAX * 4) + 1) * 2];
+	u8 read_buffer[ASUS_WMI_BLOCK_READ_REGISTERS_MAX];
+	u8 nr_sensors; /* number of board EC sensors */
+	/* number of EC registers to read (sensor might span more than 1 register) */
+	u8 nr_registers;
+	unsigned long last_updated; /* in jiffies */
+};
+
+struct asus_wmi_sensors {
+	/* lock access to instrnal cache */
+	struct mutex lock;
+	struct asus_wmi_ec_info ec;
+
+	int ec_board;
+};
+
+struct asus_wmi_data {
+	int ec_board;
+};
+
+static inline union asus_wmi_ec_sensor_address asus_wmi_ec_make_sensor_address(u8 size,
+									       u8 bank,
+									       u8 index)
+{
+	union asus_wmi_ec_sensor_address res;
+
+	res.value = (size << 16) + (bank << 8) + index;
+	return res;
+}
+
+static inline void asus_wmi_ec_set_sensor_info(struct asus_wmi_ec_sensor_info *sensor_info,
+					       const char *label,
+					       enum hwmon_sensor_types type,
+					       union asus_wmi_ec_sensor_address addr,
+					       u8 *nr_regs)
+{
+	sensor_info->type = type;
+	strcpy(sensor_info->label, label);
+	sensor_info->cached_value = 0;
+	sensor_info->addr.value = addr.value;
+	*nr_regs += sensor_info->addr.addr.size;
+}
+
+static void asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec, int board)
+{
+	struct asus_wmi_ec_sensor_info *si;
+
+	si = ec->sensors;
+	ec->nr_registers = 0;
+
+	switch (board) {
+	case BOARD_RS_B550_E_G:
+	case BOARD_RS_X570_E_G:
+	case BOARD_R_C8H:
+	case BOARD_R_C8DH:
+	case BOARD_R_C8F:
+		asus_wmi_ec_set_sensor_info(si++, "Chipset", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x00, 0x3A),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "CPU", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x00, 0x3B),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "Motherboard", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x00, 0x3C),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "T_Sensor", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x00, 0x3D),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "VRM", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x00, 0x3E),
+					    &ec->nr_registers);
+	}
+
+	switch (board) {
+	case BOARD_RS_X570_E_G:
+	case BOARD_R_C8H:
+	case BOARD_R_C8DH:
+	case BOARD_R_C8F:
+		asus_wmi_ec_set_sensor_info(si++, "CPU_Opt", hwmon_fan,
+					    asus_wmi_ec_make_sensor_address(2, 0x00, 0xB0),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "CPU", hwmon_curr,
+					    asus_wmi_ec_make_sensor_address(1, 0x00, 0xF4),
+					    &ec->nr_registers);
+	}
+
+	switch (board) {
+	case BOARD_RS_X570_E_G:
+	case BOARD_R_C8H:
+	case BOARD_R_C8F:
+		asus_wmi_ec_set_sensor_info(si++, "Chipset", hwmon_fan,
+					    asus_wmi_ec_make_sensor_address(2, 0x00, 0xB4),
+					    &ec->nr_registers);
+	}
+
+	switch (board) {
+	case BOARD_R_C8H:
+	case BOARD_R_C8DH:
+	case BOARD_R_C8F:
+		asus_wmi_ec_set_sensor_info(si++, "Water", hwmon_fan,
+					    asus_wmi_ec_make_sensor_address(2, 0x00, 0xBC),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "Water_In", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x01, 0x00),
+					    &ec->nr_registers);
+		asus_wmi_ec_set_sensor_info(si++, "Water_Out", hwmon_temp,
+					    asus_wmi_ec_make_sensor_address(1, 0x01, 0x01),
+					    &ec->nr_registers);
+	}
+
+	ec->nr_sensors = si - ec->sensors;
+}
+
+/*
+ * The next four functions converts to/from BRxx string argument format
+ * The format of the string is as follows:
+ * The string consists of two-byte UTF-16 characters
+ * The value of the very first byte int the string is equal to the total length
+ * of the next string in bytes, thus excluding the first two-byte character
+ * The rest of the string encodes pairs of (bank, index) pairs, where both
+ * values are byte-long (0x00 to 0xFF)
+ * Numbers are encoded as UTF-16 hex values
+ */
+
+static inline char *asus_wmi_ec_hex_utf_16_le_pack(char *buf, u8 byte)
+{
+	*buf++ = hex_asc_hi(byte);
+	*buf++ = 0;
+	*buf++ = hex_asc_lo(byte);
+	*buf++ = 0;
+	return buf;
+}
+
+static void asus_wmi_ec_decode_reply_buffer(const u8 *inp, u8 *out)
+{
+	u8 len = ACPI_MIN(ASUS_WMI_MAX_BUF_LEN, inp[0] / 4);
+	const u8 *data = inp + 2;
+	u8 i;
+
+	for (i = 0; i < len; ++i, data += 4)
+		out[i] = (hex_to_bin(data[0]) << 4) + hex_to_bin(data[2]);
+}
+
+static void asus_wmi_ec_encode_registers(u16 *registers, u8 len, char *out)
+{
+	u8 i;
+
+	// assert(len <= 30)
+	*out++ = len * 8;
+	*out++ = 0;
+	for (i = 0; i < len; ++i) {
+		out = asus_wmi_ec_hex_utf_16_le_pack(out, (registers[i] & 0xFF00) >> 8);
+		out = asus_wmi_ec_hex_utf_16_le_pack(out, (registers[i] & 0x00FF));
+	}
+}
+
+static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
+{
+	u16 registers[ASUS_EC_KNOWN_EC_REGISTERS];
+	u8 i, j, register_idx = 0;
+
+	/* if we can get values for all the registers in a single query,
+	 * the query will not change from call to call
+	 */
+	if (ec->nr_registers <= ASUS_WMI_BLOCK_READ_REGISTERS_MAX &&
+	    ec->read_arg[0] > 0) {
+		/* no need to update */
+		return;
+	}
+
+	for (i = 0; i < ec->nr_sensors; ++i) {
+		for (j = 0; j < ec->sensors[i].addr.addr.size;
+		     ++j, ++register_idx) {
+			registers[register_idx] =
+				(ec->sensors[i].addr.addr.bank << 8) +
+				ec->sensors[i].addr.addr.index + j;
+		}
+	}
+
+	asus_wmi_ec_encode_registers(registers, ec->nr_registers, ec->read_arg);
+}
+
+static int asus_wmi_ec_block_read(u32 method_id, const char *query, u8 *out)
+{
+	struct acpi_buffer input;
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER,
+				      NULL }; // TODO use pre-allocated buffer
+	acpi_status status;
+	union acpi_object *obj;
+
+	/* the first byte of the BRxx() argument string has to be the string size */
+	input.length = (acpi_size)query[0] + 2;
+	input.pointer = (void *)query;
+	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0, method_id, &input,
+				     &output);
+
+	if (ACPI_FAILURE(status)) {
+		acpi_os_free(output.pointer);
+		return -EIO;
+	}
+
+	obj = output.pointer;
+	if (!obj || obj->type != ACPI_TYPE_BUFFER) {
+		pr_err("unexpected reply type from ASUS ACPI code");
+		acpi_os_free(output.pointer);
+		return -EIO;
+	}
+	asus_wmi_ec_decode_reply_buffer(obj->buffer.pointer, out);
+	acpi_os_free(output.pointer);
+	return 0;
+}
+
+static int asus_wmi_ec_update_ec_sensors(struct asus_wmi_ec_info *ec)
+{
+	struct asus_wmi_ec_sensor_info *si;
+	u32 value;
+	int status;
+	u8 i_sensor, read_reg_ct, i_sensor_register;
+
+	asus_wmi_ec_make_block_read_query(ec);
+	status = asus_wmi_ec_block_read(ASUSWMI_METHODID_BLOCK_READ_EC,
+					ec->read_arg,
+					ec->read_buffer);
+	if (status)
+		return status;
+
+	read_reg_ct = 0;
+	for (i_sensor = 0; i_sensor < ec->nr_sensors; ++i_sensor) {
+		si = &ec->sensors[i_sensor];
+		value = ec->read_buffer[read_reg_ct++];
+		for (i_sensor_register = 1;
+		     i_sensor_register < si->addr.addr.size;
+		     ++i_sensor_register) {
+			value <<= 8;
+			value += ec->read_buffer[read_reg_ct++];
+		}
+		si->cached_value = value;
+	}
+	return 0;
+}
+
+static int asus_wmi_ec_scale_sensor_value(u32 value, int data_type)
+{
+	switch (data_type) {
+	case hwmon_curr:
+	case hwmon_temp:
+	case hwmon_in:
+		return value * 1000;
+	default:
+		return value;
+	}
+}
+
+static u8 asus_wmi_ec_find_sensor_index(const struct asus_wmi_ec_info *ec,
+					enum hwmon_sensor_types type, int channel)
+{
+	u8 i;
+
+	for (i = 0; i < ec->nr_sensors; ++i) {
+		if (ec->sensors[i].type == type) {
+			if (channel == 0)
+				return i;
+
+			--channel;
+		}
+	}
+	return 0xFF;
+}
+
+static int asus_wmi_ec_get_cached_value_or_update(int sensor_index,
+						  struct asus_wmi_sensors *state,
+						  u32 *value)
+{
+	int ret;
+
+	if (time_after(jiffies, state->ec.last_updated + HZ)) {
+		ret = asus_wmi_ec_update_ec_sensors(&state->ec);
+
+		if (ret) {
+			pr_err("asus_wmi_ec_update_ec_sensors() failure\n");
+			return -EIO;
+		}
+
+		state->ec.last_updated = jiffies;
+	}
+
+	*value = state->ec.sensors[sensor_index].cached_value;
+	return 0;
+}
+
+/*
+ * Now follow the functions that implement the hwmon interface
+ */
+
+static int asus_wmi_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+				  u32 attr, int channel, long *val)
+{
+	int ret;
+	u32 value = 0;
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+
+	u8 sidx = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+
+	mutex_lock(&sensor_data->lock);
+
+	ret = asus_wmi_ec_get_cached_value_or_update(sidx, sensor_data, &value);
+	mutex_unlock(&sensor_data->lock);
+
+	if (!ret)
+		*val = asus_wmi_ec_scale_sensor_value(value, sensor_data->ec.sensors[sidx].type);
+
+	return ret;
+}
+
+static int asus_wmi_ec_hwmon_read_string(struct device *dev,
+					 enum hwmon_sensor_types type, u32 attr,
+					 int channel, const char **str)
+{
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+
+	u8 sensor_index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+	*str = sensor_data->ec.sensors[sensor_index].label;
+
+	return 0;
+}
+
+static umode_t asus_wmi_ec_hwmon_is_visible(const void *drvdata,
+					    enum hwmon_sensor_types type, u32 attr,
+					    int channel)
+{
+	const struct asus_wmi_sensors *sensor_data = drvdata;
+
+	return asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel) != 0xFF ?
+			     0444 :
+			     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)
+{
+	int i;
+	u32 *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;
+	for (i = 0; i < num; i++, cfg++)
+		*cfg = config;
+
+	return 0;
+}
+
+static const struct hwmon_ops asus_wmi_ec_hwmon_ops = {
+	.is_visible = asus_wmi_ec_hwmon_is_visible,
+	.read = asus_wmi_ec_hwmon_read,
+	.read_string = asus_wmi_ec_hwmon_read_string,
+};
+
+static struct hwmon_chip_info asus_wmi_ec_chip_info = {
+	.ops = &asus_wmi_ec_hwmon_ops,
+	.info = NULL,
+};
+
+static int asus_wmi_ec_configure_sensor_setup(struct platform_device *pdev,
+					      struct asus_wmi_sensors *sensor_data)
+{
+	int i;
+	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;
+	const struct hwmon_channel_info **ptr_asus_wmi_ci;
+	const struct hwmon_chip_info *chip_info;
+	const struct asus_wmi_ec_sensor_info *si;
+	enum hwmon_sensor_types type;
+
+	if (sensor_data->ec_board < 0)
+		return 0;
+
+	asus_wmi_ec_fill_board_sensors(&sensor_data->ec, sensor_data->ec_board);
+
+	if (!sensor_data->ec.nr_sensors)
+		return -ENODEV;
+
+	for (i = 0; i < sensor_data->ec.nr_sensors; ++i) {
+		si = &sensor_data->ec.sensors[i];
+		if (!nr_count[si->type])
+			++nr_types;
+		++nr_count[si->type];
+	}
+
+	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_ec_chip_info.info = ptr_asus_wmi_ci;
+	chip_info = &asus_wmi_ec_chip_info;
+
+	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++;
+	}
+
+	pr_info("%s board has %d EC sensors that span %d registers",
+		asus_wmi_ec_boards_names[sensor_data->ec_board],
+		sensor_data->ec.nr_sensors,
+		sensor_data->ec.nr_registers);
+
+	hwdev = devm_hwmon_device_register_with_info(dev, "asuswmiecsensors",
+						     sensor_data, chip_info, NULL);
+
+	return PTR_ERR_OR_ZERO(hwdev);
+}
+
+static int asus_wmi_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct asus_wmi_data *data = dev_get_platdata(dev);
+	struct asus_wmi_sensors *sensor_data;
+	int err;
+
+	sensor_data = devm_kzalloc(dev, sizeof(struct asus_wmi_sensors),
+				   GFP_KERNEL);
+	if (!sensor_data)
+		return -ENOMEM;
+
+	mutex_init(&sensor_data->lock);
+	sensor_data->ec_board = data->ec_board;
+
+	platform_set_drvdata(pdev, sensor_data);
+
+	/* ec init */
+	err = asus_wmi_ec_configure_sensor_setup(pdev,
+						 sensor_data);
+
+	return err;
+}
+
+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;
+	struct asus_wmi_data data;
+
+	data.ec_board = -1;
+
+	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.ec_board = match_string(asus_wmi_ec_boards_names,
+					     ARRAY_SIZE(asus_wmi_ec_boards_names),
+					     board_name);
+	}
+
+	/* Nothing to support */
+	if (data.ec_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));
+
+	if (IS_ERR(sensors_pdev))
+		return PTR_ERR(sensors_pdev);
+
+	return 0;
+}
+
+static void __exit asus_wmi_exit(void)
+{
+	platform_device_unregister(sensors_pdev);
+	platform_driver_unregister(&asus_wmi_sensors_platform_driver);
+}
+
+MODULE_AUTHOR("Ed Brindley <kernel@...davale.org>");
+MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@...il.com>");
+MODULE_DESCRIPTION("Asus WMI Sensors Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1");
+
+module_init(asus_wmi_init);
+module_exit(asus_wmi_exit);
-- 
2.33.0

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