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Subject[PATCH v10 2/2] hwmon: (asus_wmi_sensors) Support X370 Asus WMI.
Date
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.

Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Co-developed-by: Ed Brindley <kernel@maidavale.org>
Signed-off-by: Ed Brindley <kernel@maidavale.org>

---
Changes in v10:
- Use long for sensor values.
- Remove unrequired linux/hwmon-sysfs.h
- Change code style in error status return.
- Remove unuses wmi.buffer and fix type of source.

Changes in v9:
- Fix memory leaks in asus_wmi_*().

Changes in v8:
- Fix codestyle in defines and comments.
- Call mutex_lock inside of functions.

Changes in v7:
- Add depends on ACPI_WMI to Kconfig.
- Clean up defines names.

Changes in v6:
- Add asus_wmi_sensor to documentation index.

Changes in v5:
- Fixes build issue reported by kernel test robot with disabled ACPI_WMI.
- Remove sensor->name check as always eevaluated to true.

Changes in v4:
- Implement wmi driver instead platform driver.
- Update documentation.

Changes in v3:
- Use MODULE_DEVICE_TABLE for match devices.
- Add documentaion for driver.

Changes in v2:
- Add module for boards with support of WMI interface returned sensor name and
value of sensor..
---
Documentation/hwmon/asus_wmi_sensors.rst | 76 +++
Documentation/hwmon/index.rst | 1 +
MAINTAINERS | 1 +
drivers/hwmon/Kconfig | 12 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/asus_wmi_sensors.c | 664 +++++++++++++++++++++++
6 files changed, 755 insertions(+)
create mode 100644 Documentation/hwmon/asus_wmi_sensors.rst
create mode 100644 drivers/hwmon/asus_wmi_sensors.c

diff --git a/Documentation/hwmon/asus_wmi_sensors.rst b/Documentation/hwmon/asus_wmi_sensors.rst
new file mode 100644
index 000000000000..408fd3b4a0de
--- /dev/null
+++ b/Documentation/hwmon/asus_wmi_sensors.rst
@@ -0,0 +1,76 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver asus_wmi_sensors
+=================================
+
+Supported boards:
+ * PRIME X399-A,
+ * PRIME X470-PRO,
+ * ROG CROSSHAIR VI EXTREME,
+ * ROG CROSSHAIR VI HERO,
+ * 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.
+
+Authors:
+ - Ed Brindley <kernel@maidavale.org>
+
+Description:
+------------
+ASUS mainboards publish hardware monitoring information via WMI interface.
+
+ASUS WMI interface provides a methods to get list of sensors and values of
+such, which is utilized by this driver to publish those sensor readings to the
+HWMON system. The driver is aware of and reads the following sensors:
+ * 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 RPM,
+ * Chassis Fan 1 RPM,
+ * Chassis Fan 2 RPM,
+ * Chassis Fan 3 RPM,
+ * HAMP Fan RPM,
+ * Water Pump RPM,
+ * CPU OPT RPM,
+ * Water Flow RPM,
+ * AIO Pump RPM,
+ * CPU Temperature,
+ * CPU Socket Temperature,
+ * Motherboard Temperature,
+ * Chipset Temperature,
+ * Tsensor 1 Temperature,
+ * CPU VRM Temperature,
+ * Water In,
+ * Water Out,
+ * CPU VRM Output Current.
+
+Known Issues:
+* The WMI implementation in some of Asus' BIOSes is buggy. This can result in
+ fans stopping, fans getting stuck at max speed, or temperature readouts
+ getting stuck. This is not an issue with the driver, but the BIOS. The Prime
+ X470 Pro seems particularly bad for this. The more frequently the WMI
+ interface is polled the greater the potential for this to happen. Until you
+ have subjected your computer to an extended soak test while polling the
+ sensors frequently, don't leave you computer unattended. Upgrading to new
+ BIOS version with method version greater than or equal to two should
+ rectify the issue.
+* A few boards report 12v voltages to be ~10v.
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 23deb1a1202f..6dca9df9d24a 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -44,6 +44,7 @@ Hardware Monitoring Kernel Drivers
asc7621
aspeed-pwm-tacho
asus_wmi_ec_sensors
+ asus_wmi_sensors
bcm54140
bel-pfe
bpa-rs600
diff --git a/MAINTAINERS b/MAINTAINERS
index 05448435991d..46036c184330 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2943,6 +2943,7 @@ M: Denis Pauk <pauk.denis@gmail.com>
L: linux-hwmon@vger.kernel.org
S: Maintained
F: drivers/hwmon/asus_wmi_ec_sensors.c
+F: drivers/hwmon/asus_wmi_sensors.c

ASUS WIRELESS RADIO CONTROL DRIVER
M: João Paulo Rechi Vita <jprvita@gmail.com>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 01d50fb9da54..d99aef4b2583 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 X370/X470/B450/X399"
+ depends on ACPI_WMI
+ 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"
depends on ACPI_WMI
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..67af15d99396
--- /dev/null
+++ b/drivers/hwmon/asus_wmi_sensors.c
@@ -0,0 +1,664 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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) 2018-2019 Ed Brindley <kernel@maidavale.org>
+ *
+ * WMI interface provides:
+ * - 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 RPM,
+ * - Chassis Fan 1 RPM,
+ * - Chassis Fan 2 RPM,
+ * - Chassis Fan 3 RPM,
+ * - HAMP Fan RPM,
+ * - Water Pump RPM,
+ * - CPU OPT RPM,
+ * - Water Flow RPM,
+ * - AIO Pump RPM,
+ * - 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/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/units.h>
+#include <linux/wmi.h>
+
+#define ASUSWMI_MONITORING_GUID "466747A0-70EC-11DE-8A39-0800200C9A66"
+#define ASUSWMI_METHODID_GET_VALUE 0x52574543 /* RWEC */
+#define ASUSWMI_METHODID_UPDATE_BUFFER 0x51574543 /* QWEC */
+#define ASUSWMI_METHODID_GET_INFO 0x50574543 /* PWEC */
+#define ASUSWMI_METHODID_GET_NUMBER 0x50574572 /* PWEr */
+#define ASUSWMI_METHODID_GET_VERSION 0x50574574 /* PWEt */
+
+#define ASUS_WMI_MAX_STR_SIZE 32
+
+#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name) { \
+ .matches = { \
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC."), \
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, name), \
+ }, \
+}
+
+static const struct dmi_system_id asus_wmi_dmi_table[] = {
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X399-A"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X470-PRO"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI EXTREME"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI HERO"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI HERO (WI-FI AC)"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VII HERO"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VII HERO (WI-FI)"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-E GAMING"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-F GAMING"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-I GAMING"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X399-E GAMING"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X470-F GAMING"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X470-I GAMING"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH EXTREME"),
+ DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH EXTREME ALPHA"),
+ {}
+};
+MODULE_DEVICE_TABLE(dmi, asus_wmi_dmi_table);
+
+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;
+ long cached_value;
+};
+
+struct asus_wmi_wmi_info {
+ unsigned long source_last_updated[3]; /* in jiffies */
+ int sensor_count;
+
+ const struct asus_wmi_sensor_info **info[hwmon_max];
+ struct asus_wmi_sensor_info **info_by_id;
+};
+
+struct asus_wmi_sensors {
+ struct asus_wmi_wmi_info wmi;
+ /* lock access to internal cache */
+ struct mutex lock;
+};
+
+/*
+ * 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)
+ return -EIO;
+
+ if (obj->type != ACPI_TYPE_INTEGER) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ err = 0;
+ *version = obj->integer.value;
+
+out_free_obj:
+ ACPI_FREE(obj);
+ return err;
+}
+
+/*
+ * 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)
+ return -EIO;
+
+ if (obj->type != ACPI_TYPE_INTEGER) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ err = 0;
+ *count = obj->integer.value;
+
+out_free_obj:
+ ACPI_FREE(obj);
+ return err;
+}
+
+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)
+ return -EIO;
+
+ if (obj->type != ACPI_TYPE_PACKAGE) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ if (obj->package.count != 5) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ name_obj = obj->package.elements[0];
+ if (name_obj.type != ACPI_TYPE_STRING) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ 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) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ s->data_type = data_type_obj.integer.value;
+
+ location_obj = obj->package.elements[2];
+ if (location_obj.type != ACPI_TYPE_INTEGER) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ s->location = location_obj.integer.value;
+
+ source_obj = obj->package.elements[3];
+ if (source_obj.type != ACPI_TYPE_INTEGER) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ s->source = source_obj.integer.value;
+
+ type_obj = obj->package.elements[4];
+ if (type_obj.type != ACPI_TYPE_INTEGER) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ err = 0;
+ s->type = type_obj.integer.value;
+
+out_free_obj:
+ ACPI_FREE(obj);
+ return err;
+}
+
+static int asus_wmi_update_buffer(int source)
+{
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ u32 args[] = {source, 0};
+
+ return asus_wmi_call_method(ASUSWMI_METHODID_UPDATE_BUFFER, args, &output);
+}
+
+static int asus_wmi_get_sensor_value(u8 index, long *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)
+ return -EIO;
+
+ if (obj->type != ACPI_TYPE_INTEGER) {
+ err = -EIO;
+ goto out_free_obj;
+ }
+
+ err = 0;
+ *value = obj->integer.value;
+
+out_free_obj:
+ ACPI_FREE(obj);
+ return err;
+}
+
+static int asus_wmi_update_values_for_source(u8 source, struct asus_wmi_sensors *sensor_data)
+{
+ struct asus_wmi_sensor_info *sensor;
+ long value = 0;
+ int ret;
+ int i;
+
+ 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)
+ return ret;
+
+ sensor->cached_value = value;
+ }
+ }
+
+ return 0;
+}
+
+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:
+ /* value in microVolts */
+ return DIV_ROUND_CLOSEST(value, KILO);
+ case TEMPERATURE_C:
+ /* value in Celsius */
+ return value * MILLIDEGREE_PER_DEGREE;
+ case CURRENT:
+ /* value in Amperes */
+ return value * MILLI;
+ }
+ 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 = 0;
+
+ mutex_lock(&sensor_data->lock);
+
+ if (time_after(jiffies, sensor_data->wmi.source_last_updated[sensor->source] + HZ)) {
+ ret = asus_wmi_update_buffer(sensor->source);
+ if (ret)
+ goto unlock;
+
+ ret = asus_wmi_update_values_for_source(sensor->source, sensor_data);
+ if (ret)
+ goto unlock;
+
+ sensor_data->wmi.source_last_updated[sensor->source] = jiffies;
+ }
+
+ *value = sensor->cached_value;
+
+unlock:
+ mutex_unlock(&sensor_data->lock);
+
+ return ret;
+}
+
+/* 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)
+{
+ const struct asus_wmi_sensor_info *sensor;
+ u32 value = 0;
+ int ret;
+
+ struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+
+ sensor = *(sensor_data->wmi.info[type] + channel);
+
+ ret = asus_wmi_get_cached_value_or_update(sensor, sensor_data, &value);
+ if (ret)
+ return 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)
+{
+ struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+ const struct asus_wmi_sensor_info *sensor;
+
+ 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_sensors *sensor_data = drvdata;
+ const struct asus_wmi_sensor_info *sensor;
+
+ sensor = *(sensor_data->wmi.info[type] + channel);
+ if (sensor)
+ 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 device *dev,
+ struct asus_wmi_sensors *sensor_data)
+{
+ const struct hwmon_channel_info **ptr_asus_wmi_ci;
+ struct hwmon_channel_info *asus_wmi_hwmon_chan;
+ int nr_count[hwmon_max] = {}, nr_types = 0;
+ struct asus_wmi_sensor_info *temp_sensor;
+ const struct hwmon_chip_info *chip_info;
+ enum hwmon_sensor_types type;
+ struct device *hwdev;
+ int i, idx;
+ int err;
+
+ 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 err;
+
+ 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;
+
+ err = asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
+ nr_count[type], type,
+ hwmon_attributes[type]);
+ if (err)
+ return err;
+
+ *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(dev, "board has %d sensors",
+ sensor_data->wmi.sensor_count);
+
+ hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_sensors",
+ sensor_data, chip_info, NULL);
+
+ return PTR_ERR_OR_ZERO(hwdev);
+}
+
+static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+ struct asus_wmi_sensors *sensor_data;
+ struct device *dev = &wdev->dev;
+ u32 version = 0;
+
+ if (!dmi_check_system(asus_wmi_dmi_table))
+ return -ENODEV;
+
+ sensor_data = devm_kzalloc(dev, sizeof(*sensor_data), GFP_KERNEL);
+ if (!sensor_data)
+ return -ENOMEM;
+
+ if (asus_wmi_get_version(&version))
+ return -ENODEV;
+
+ if (asus_wmi_get_item_count(&sensor_data->wmi.sensor_count))
+ return -ENODEV;
+
+ if (sensor_data->wmi.sensor_count <= 0 || version < 2) {
+ dev_info(dev, "version: %u with %d sensors is unsupported\n",
+ version, sensor_data->wmi.sensor_count);
+
+ return -ENODEV;
+ }
+
+ mutex_init(&sensor_data->lock);
+
+ dev_set_drvdata(dev, sensor_data);
+
+ return asus_wmi_configure_sensor_setup(dev, sensor_data);
+}
+
+static const struct wmi_device_id asus_wmi_id_table[] = {
+ { ASUSWMI_MONITORING_GUID, NULL },
+ { }
+};
+
+static struct wmi_driver asus_sensors_wmi_driver = {
+ .driver = {
+ .name = "asus_wmi_sensors",
+ },
+ .id_table = asus_wmi_id_table,
+ .probe = asus_wmi_probe,
+};
+module_wmi_driver(asus_sensors_wmi_driver);
+
+MODULE_AUTHOR("Ed Brindley <kernel@maidavale.org>");
+MODULE_DESCRIPTION("Asus WMI Sensors Driver");
+MODULE_LICENSE("GPL");
--
2.33.0
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